JP2017152997A - Image forming apparatus, program for controlling image forming apparatus, and method for controlling image forming apparatus - Google Patents

Abstract

CONSTITUTION: An image forming apparatus (10) comprises a human detection sensor (28), a paper ejection sensor (50), and a CPU (12), when the image forming apparatus (10) is not operated for a predetermined time, determines that, under the instructions from the CPU (12), the presence of a person in a first range (A) with the human detection sensor (28) in a power-saving mode, and when the absence of sheets ejected to a paper ejection tray (40) is determined by the paper ejection sensor (50), sets the operation mode to a normal mode.EFFECT: An image forming apparatus can save power and appropriately make a transition from a power-saving mode to a normal mode with an inexpensive configuration.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an image forming apparatus, an image forming apparatus control program, and an image forming apparatus control method, and in particular, an image forming apparatus having, for example, a power saving state in which power consumption is restricted and a normal state in which power consumption is not restricted, The present invention relates to an image forming apparatus control program and an image forming apparatus control method.

  An example of a background art image forming apparatus is disclosed in Japanese Patent Application Laid-Open No. H10-228707. In this patent document 1, a power saving state in which an image processing unit including a first processor that controls copy, print, and scan functions is not used, and a normal operation that can use all the functions including the image processing unit is possible. An MFP having a state is disclosed. The MFP includes an operation panel unit including a second processor that controls the operation panel, a switching unit that turns on power supply to the first processor (transitions to the normal mode) in response to a restart request from the second processor, A human sensor for detecting a person near the operation panel and a motion sensor for detecting a predetermined operation motion by acquiring an image at a predetermined position are provided. In the power saving mode, the second processor outputs a restart request when a human is detected by the motion sensor and a predetermined operation motion is detected by the motion sensor, turns on the switching unit, and performs image processing. Restart the unit. That is, the MFP transits to a state where it can be normally operated.

JP 2010-157789 A

  In the background art MFP, even if a human is detected by the human sensor, the MFP is not restarted until a predetermined operation motion is detected. Therefore, the MFP cannot be used until the image processing unit is restarted, which is inconvenient for those who want to use the MFP immediately. Also, in the background art MFP, a motion sensor is provided to reduce the possibility of restarting the MFP due to the approach of a user who does not intend to operate, thereby obtaining a standby power reduction effect. The sensor is a digital camera, and even if used as a human sensor, it becomes expensive. Further, the user needs to perform a predetermined operation motion, and the operation is troublesome.

  SUMMARY OF THE INVENTION Therefore, a main object of the present invention is to provide a novel image forming apparatus, an image forming apparatus control program, and an image forming apparatus control method.

  Another object of the present invention is to provide an image forming apparatus, a control program for the image forming apparatus, and an image forming apparatus, which can achieve power saving and can appropriately shift from the power saving mode to the normal mode with an inexpensive configuration. Is to provide.

  A first invention includes an apparatus main body including an image forming unit and a discharge unit that discharges a recording medium on which an image is formed by the image forming unit, and the first saving in which power consumption is limited to a predetermined value or less. An image forming apparatus having a normal state in which the power state and the power consumption are not limited, and includes an existence determination unit, a presence determination unit, and a state setting unit. The presence determination means determines whether or not a person is present in a first range set around the apparatus main body in the first power saving state. As the presence determination means, for example, an infrared sensor, an ultrasonic sensor, a laser distance sensor, or the like is used. The presence / absence judging means judges whether or not there is a recording medium ejected to the ejecting unit. As the presence / absence judging means, it is only necessary to detect the presence / absence of a recording medium, and therefore, a general-purpose contact sensor or optical sensor can be used. The state setting means is in a normal state when it is determined by the presence determination means that there is a person in the first range, and when the presence determination means determines that there is no recording medium ejected to the paper discharge unit. Set.

  According to the first invention, in the first power saving state, when there is a person around the image forming apparatus and there is no recording medium ejected to the ejecting unit, the normal state is set. Even if a person who only removes the medium from the discharge unit is detected, the normal state is not changed. In this way, since it only detects the presence or absence of a recording medium, it shifts to the normal state as needed without forcing the user to perform another operation, so appropriate power control can be performed and wasted power is consumed. Can be prevented. In addition, according to the first invention, a general-purpose distance sensor or pressure sensor can be used as the presence determination unit, and it is not necessary to use an expensive sensor such as a digital camera, so that the image forming apparatus is expensive. Can also be avoided.

  A second invention is an image forming apparatus according to the first invention, further comprising a second power saving state in which the power consumption is larger than a predetermined value, and the state setting means is provided in the first range by the presence determination means. Is determined to be present, and the presence / absence determining means determines that there is a recording medium discharged to the paper discharge unit, the second power saving state is set. When the predetermined condition is satisfied, the normal state is set.

  According to the second invention, when it is determined by the presence determination means that there is a person in the first range, and the presence determination means determines that there is a recording medium discharged to the paper discharge unit, Since the second power saving state in which the power consumption is larger than the predetermined value is set, when the user who has picked up the paper uses the image forming apparatus, the time until the user starts using the image forming apparatus is set. It can be shortened.

  A third invention is an image forming apparatus according to the second invention, wherein the predetermined condition includes that the second power saving state has continued for a predetermined time.

  According to the third invention, when the second power saving state continues for a predetermined time or more, the normal state is set. Therefore, since it shifts to a normal state as needed without forcing the user to perform another operation, appropriate power control can be performed.

  A fourth invention is an image forming apparatus according to any one of the first to third inventions, wherein there is a recording medium discharged to a paper discharge unit by a presence / absence determining means in the first power saving state. If it is determined, the apparatus further comprises range setting means for setting a second range different from the first range, and the presence determination means, when the second range is set by the range setting means, Whether or not a person exists in the range is determined, and the state setting unit sets the normal state when the presence determination unit determines that a person exists in the second range.

  According to the fourth invention, in the first power saving state, the second range different from the first range is set when the presence / absence determining means determines that there is a recording medium discharged to the paper discharge unit. When it is determined that there is a person in the second range, the normal state is set. Therefore, depending on whether there is a recording medium ejected in the paper ejection unit, the first range and the second range are set. Any appropriate range can be set and appropriate power control can be performed, and wasteful power consumption can be prevented.

  A fifth invention is an image forming apparatus according to the fourth invention, wherein the range setting means sets a second range that is narrower than the first range.

  According to the fifth aspect, when it is determined that there is a recording medium discharged to the paper discharge unit, the second range narrower than the first range is set, so the recording discharged to the paper discharge unit When there is a medium, it becomes difficult to detect a person who simply takes out the recording medium on which the image is formed from the discharge unit, appropriate power control can be performed, and wasteful power consumption can be prevented.

  A sixth invention is an image forming apparatus according to the fourth or fifth invention, wherein the range setting means sets a second range of the first range excluding the periphery of the paper discharge section.

  According to the sixth aspect, since the second range is set so as to exclude the periphery of the paper discharge unit, it is possible to prevent detection of a person who only takes out the image-formed recording medium from the discharge unit. In this way, it is possible to distinguish between a person who only takes out the image-formed recording medium from the discharge unit and a person who intends to use the image forming apparatus, and can perform appropriate power control, thereby reducing wasteful power. Can be prevented.

  A seventh invention is an image forming apparatus according to any one of the first to sixth inventions, wherein an image corresponding to data received from the outside is recorded by the image forming unit on the recording medium discharged to the discharge unit. Includes formed recording media.

  According to the seventh invention, the recording medium discharged to the discharge unit includes a recording medium in which an image corresponding to data received from the outside is formed by the image forming unit. When there is a high possibility that a person is in the first range, it is possible to perform appropriate power supply control and prevent wasteful power consumption.

  An eighth invention is an image forming apparatus according to any one of the first to seventh inventions, and the setting means sets the first power saving state when the image forming apparatus is not operated for a predetermined time.

  According to the eighth invention, when the image forming apparatus is not operated for a predetermined time, the first power saving state is set. Therefore, since it shifts to a normal state as necessary without forcing the user to perform another operation, it is possible to perform appropriate power control and prevent wasteful power consumption.

  A ninth invention includes an apparatus main body including an image forming unit and a discharge unit that discharges a recording medium on which an image is formed by the image forming unit, and the power consumption is limited to a predetermined value or less. An image forming apparatus having a normal state in which a power state and power consumption are not limited, and includes an existence determination unit, a presence determination unit, a range setting unit, and a state setting unit. The presence determination means determines whether or not a person is present in a first range set around the apparatus main body in the first power saving state. The presence / absence judging means judges whether or not there is a recording medium ejected to the ejecting unit. The range setting unit sets a second range that is narrower than the first range when it is determined by the presence / absence determination unit that there is a recording medium discharged to the paper discharge unit. The state setting unit sets the normal state when the presence determination unit determines that a person exists in the first range.

  According to the ninth aspect, in the first power saving state, when it is determined that there is a recording medium discharged to the paper discharge unit, the second range narrower than the first range is set. When there is a recording medium ejected on the paper portion, it is difficult to detect a person who simply takes out the recording medium on which the image is formed from the ejection portion. In this way, since it only detects the presence or absence of a recording medium, it shifts to the normal state as needed without forcing the user to perform another operation, so appropriate power control can be performed and wasted power is consumed. Can be prevented. Further, according to the ninth invention, a general-purpose contact sensor or optical sensor can be used as the presence determination unit, and it is not necessary to use an expensive sensor such as a digital camera, so that the image forming apparatus is expensive. It can also be avoided.

  A tenth aspect of the invention is an image forming apparatus according to the ninth aspect of the invention, further comprising a second power saving state in which power consumption is greater than a predetermined value, and the setting means is within the first range by the presence determining means. When it is determined that there is a person and it is determined by the presence / absence determining means that there is a recording medium discharged to the paper discharge unit, the second power saving state is set. When a predetermined condition is satisfied, the normal state is set.

  According to the tenth invention, when it is determined by the presence determining means that there is a person in the first range, and the presence determining means determines that there is a recording medium discharged to the paper discharge unit, Since the second power saving state in which the power consumption is larger than the predetermined value is set, when the user who has picked up the paper uses the image forming apparatus, the time until the user starts using the image forming apparatus is set. It can be shortened.

  An eleventh invention is an image forming apparatus according to the tenth invention, wherein the predetermined condition includes that the second power saving state has continued for a predetermined time.

  According to the eleventh aspect, when the second power saving state continues for a predetermined time, the normal state is set. Therefore, since it shifts to a normal state as necessary without forcing the user to perform another operation, it is possible to perform appropriate power control and prevent wasteful power consumption.

  A twelfth aspect of the present invention is an image forming apparatus according to any of the ninth to eleventh aspects, wherein the recording medium discharged to the discharge unit has an image corresponding to data received from the outside by the image formation unit. Includes formed recording media.

  According to the twelfth aspect, the recording medium discharged to the discharge unit includes a recording medium on which an image corresponding to data received from the outside is formed by the image forming unit. Even when a person is likely to be in the first range, appropriate power control can be performed, and wasteful power consumption can be prevented.

  A thirteenth invention is an image forming apparatus according to any of the ninth to twelfth inventions, and the setting means sets the first power saving state when the image forming apparatus is not operated for a predetermined time.

  According to the thirteenth aspect, the first power saving state is set when the image forming apparatus is not operated for a predetermined time. Therefore, since it shifts to a normal state as necessary without forcing the user to perform another operation, it is possible to perform appropriate power control and prevent wasteful power consumption.

  A fourteenth aspect of the invention includes a device body including an image forming unit and a discharge unit that discharges a recording medium on which an image is formed by the image forming unit, wherein the power consumption is limited to a predetermined value or less. A control program for an image forming apparatus having a power state and a normal state in which power consumption is not limited, wherein the computer of the image forming apparatus is placed in a first range set around the apparatus body in a first power saving state. It is determined that there is a person in the first range by presence determination means for determining whether there is a presence, determination means for determining whether there is a recording medium discharged to the discharge unit, and presence determination means, When it is determined by the presence / absence determining unit that there is no recording medium discharged to the paper discharge unit, it functions as a setting unit that sets the normal state.

  A fifteenth aspect of the present invention includes a device main body including an image forming unit and a discharge unit that discharges a recording medium on which an image is formed by the image forming unit, and the power consumption is limited to a predetermined value or less. A control program for an image forming apparatus having a power state and a normal state in which power consumption is not limited, wherein the computer of the image forming apparatus is placed in a first range set around the apparatus body in a first power saving state. Presence determining means for determining whether there is a recording medium, presence / absence determining means for determining whether or not there is a recording medium ejected to the ejecting section, and presence / absence determining means determine that there is a recording medium ejected to the ejecting section. In this case, the range changing means for setting the second range that is narrower than the first range and the setting for setting to the normal state when it is determined by the presence determining means that there is a person in the first range To function as a stage.

  A sixteenth aspect of the invention includes a device main body that includes an image forming unit and a discharge unit that discharges a recording medium on which an image is formed by the image forming unit, and wherein the power consumption is limited to a predetermined value or less. A control method of an image forming apparatus having a normal state in which a power state and a power consumption are not limited, wherein a computer of the image forming apparatus includes: (a) a first range set around the apparatus body in a first power saving state; (B) determine whether there is a discharged recording medium in the discharge unit, and (c) determine that there is a person in the first range in step (a). At the same time, when it is determined in step (b) that there is no recording medium discharged to the paper discharge unit, the normal state is set.

  A seventeenth invention includes a device body including an image forming unit and a discharge unit that discharges a recording medium on which an image is formed by the image forming unit, and the first saving in which power consumption is limited to a predetermined value or less. A control method of an image forming apparatus having a normal state in which a power state and a power consumption are not limited, wherein a computer of the image forming apparatus includes: (a) a first range set around the apparatus body in a first power saving state; (B) it is determined whether there is a recording medium ejected to the ejection unit, and (c) there is a recording medium ejected to the paper ejection unit in step (a). Is determined, a second range narrower than the first range is set, and (d) when it is determined in step (a) that there is a person in the first range, the normal range is set. .

  Also in each of the fourteenth to seventeenth inventions, as in the first or ninth invention, since the user shifts to a normal state as necessary without forcing another operation, appropriate power supply control is performed. It is possible to prevent wasteful power consumption. Further, it is possible to avoid an expensive image forming apparatus.

  According to the present invention, it is possible to achieve power saving and to appropriately shift from the power saving mode to the normal mode with an inexpensive configuration.

FIG. 1 is a front view showing an external configuration of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing an electrical configuration of the image forming apparatus shown in FIG. FIG. 3 is a plan view for explaining a first range set around the image forming apparatus. FIG. 4 is a plan view showing a case where there is no recording medium in the discharge section and there is a person in the first range. FIG. 5 is a plan view showing a case where a recording medium is present in the discharge unit and a person is present in the first range. FIG. 6 is an illustrative view showing one example of a memory map of the RAM shown in FIG. FIG. 7 is a flowchart showing an example of power control processing of the image forming apparatus 10 shown in FIG. FIG. 8 is a flowchart showing an example of the power supply control process in the second embodiment. FIG. 9 is a plan view for explaining an example of the first range and the second range set in the third embodiment. FIG. 10 is a plan view for explaining another example of the first range and the second range set in the third embodiment. FIG. 11A is a plan view for explaining an example of the first range when two human detection sensors are used in the third embodiment, and FIG. 11B is a diagram illustrating the first range shown in FIG. It is a top view for demonstrating an example of the 2nd range with respect to 1 range. FIG. 12 is a flowchart showing an example of the power supply control process in the third embodiment. FIG. 13 is a flowchart showing an example of a power supply control process in the modified embodiment.

[First embodiment]
FIG. 1 is a front view showing an external configuration of an image forming apparatus 10 according to an embodiment of the present invention. Referring to FIG. 1, in the first embodiment, image forming apparatus 10 is a multifunction peripheral (MFP) having a copying function, a printer function, a scanner function, a facsimile function, and the like. The present invention can be applied not only to a multifunction peripheral but also to other image forming apparatuses such as a copying machine (copying machine), a printing apparatus (printer), and a facsimile machine.

  The image forming apparatus 10 includes an apparatus main body 36 including an image reading unit 30, an image forming unit 32, a manual sheet feeding unit 34, a sheet feeding device 38, an in-cylinder discharge tray 40a, and an out-cylinder discharge tray 40b.

  The image reading unit 30 includes a light source, a plurality of mirrors, an imaging lens, a line sensor, and the like. The image reading unit 30 exposes the document surface with a light source, and guides reflected light reflected from the document surface to the imaging lens by a plurality of mirrors. Then, the reflected light is imaged on the light receiving element of the line sensor by the imaging lens. The line sensor detects the luminance or chromaticity of the reflected light imaged on the light receiving element, and generates read image data based on the image on the surface of the document. As the line sensor, a charge coupled device (CCD) or a contact image sensor (CIS) is used.

  The image forming unit 32 is built in the apparatus main body 36 and is provided below the image reading unit 30. The image forming unit 32 includes a photosensitive drum, a charging device, an exposure device, a developing device, a transfer device, and a fixing device. The image forming unit 32 forms an image by an electrophotographic method on a recording medium (paper) conveyed from the manual paper feeding unit 34 or the paper feeding device 38 and the like. The paper is discharged to the out-body discharge tray 40b. However, as image data for forming an image on a sheet, image data read by the image reading unit 30, image data transmitted from an external computer, or the like is used. Further, the recording medium is not limited to paper made of paper, and a sheet other than paper such as an OHP film is also used.

  The in-body discharge tray 40 a is provided between the image reading unit 30 and the image forming unit 32. The bottom surface of the in-body discharge tray 40 a is partitioned by the image forming unit 32. Further, the top surface of the in-body discharge tray 40 a is partitioned by the image reading unit 30. Further, the left side surface (the left side surface as viewed from the front) of the in-body discharge tray 40 a is defined by the right side surface of the connection casing 42. That is, the front side, the back side, and the right side of the in-body discharge tray 40a are opened. The bottom surface of the in-body discharge tray 40a has an inclined surface that is inclined downward toward the connection housing 42 side.

  The in-body discharge tray 40b is the right side surface of the apparatus main body 36 when the image forming apparatus 10 is viewed from the front, and is provided on the right side of the in-body discharge tray 40a. That is, the out-body discharge tray 40b is provided outside the width direction of the apparatus main body 36 (left and right direction as viewed from the front). The out-body discharge tray 40 b is formed by the upper surface of a plate-like member attached to the right side surface of the apparatus main body 36. Further, the out-body discharge tray 40b is inclined upward as it goes downstream in the direction in which the sheet is discharged. That is, when the image forming apparatus 10 is viewed from the front, the out-body discharge tray 40b is inclined upward as it goes to the right side.

  The in-body discharge tray 40a and the out-body discharge tray 40b are selectively used. For example, by operating an operation panel 26 which will be described later, it is set which of the in-body discharge tray 40a and the out-body discharge tray 40b is used. Hereinafter, when it is not necessary to distinguish between the in-body discharge tray 40a and the out-of-case discharge tray 40b, they are simply referred to as “discharge tray 40”.

  Further, the image forming apparatus 10 detects the presence or absence of paper discharged to the in-body discharge tray 40a and the first discharge sensor 50a for detecting the presence or absence of paper discharged to the in-body discharge tray 40a. A second paper discharge sensor 50b is provided. The first paper discharge sensor 50 a is provided on the upper surface of the image forming unit 32. The first paper discharge sensor 50 a may be provided on the lower surface of the image reading unit 30 or may be provided on the right side surface of the connection housing 42. The second paper discharge sensor 50b is provided at a connection portion between the apparatus main body 36 and the out-body discharge tray 40b. The second paper discharge sensor 50b may be provided on the upper surface of the outside-body paper discharge tray 40b or may be provided on the right side surface of the apparatus main body 36.

  The first paper discharge sensor 50a and the second paper discharge sensor 50b are selectively used. In the first embodiment, when the in-body discharge tray 40a is used, that is, when the sheet is discharged to the in-body discharge tray 40a, the first discharge sensor 50a is used. On the other hand, when the out-body discharge tray 40b is used, that is, when the sheet is discharged to the out-of-case discharge tray 40b, the second discharge sensor 50b is used. However, as described later, in the power saving mode, both the first paper discharge sensor 50a and the second paper discharge sensor 50b are used.

  An operation panel 26 is provided on the front side of the image reading unit 30. The operation panel 26 includes a display 22 with a touch panel 20 and a plurality of operation buttons 26a. However, the operation button 26a includes a button for shifting from the normal state to the power saving state and returning from the power saving state to the normal state (hereinafter referred to as “power saving button”), setting of magnification, setting of the number of copies, and fax. A button indicating a number from 0 to 9 for inputting a number, a button for starting and stopping a job, and the like are included. However, in the first embodiment, the job means copying (including scanning of an original), printing, scanning, and transmission of a fax.

  A human detection sensor 28 serving as a human detection unit for detecting a person existing in front of the apparatus main body 36 is provided at the center of the front surface of the operation panel 26.

  FIG. 2 is a block diagram showing an electrical configuration of the image forming apparatus 10 shown in FIG. Referring to FIG. 2, image forming apparatus 10 includes a CPU 12. The CPU 12 is connected to the RAM 14, the touch panel control circuit 16, the display control circuit 18, the operation button detection circuit 24, the person detection sensor 28, the paper discharge sensor 50, and the power supply control circuit 52 via the bus 60. A touch panel 20 is connected to the touch panel control circuit 16, a display 22 is connected to the display control circuit 18, and an operation button 26 a is connected to the operation button detection circuit 24.

  The CPU 12 governs overall control of the image forming apparatus 10. The RAM 14 is used as a work area and a buffer area for the CPU 12.

  The touch panel control circuit 16 applies necessary voltage and the like to the touch panel 20, detects a touch operation (touch input) within the touch effective range of the touch panel 20, and outputs touch coordinate data indicating the position of the touch input to the CPU 12. Output to.

  The touch panel 20 is a general-purpose touch panel, and an arbitrary system such as an electrostatic capacity system, an electromagnetic induction system, a resistance film system, and an infrared system can be used. In the first embodiment, a capacitive touch panel is used as the touch panel 20, and the touch panel 20 is provided on the display surface of the display 22. However, a touch panel display in which the touch panel 20 and the display 22 are integrally formed may be used.

  The display control circuit 18 includes a GPU, a VRAM, and the like. Under the instruction of the CPU 12, the GPU uses the image generation data stored in the RAM 14 to display display image data for displaying various screens on the display 22. The image data is generated in the VRAM, and the generated display image data is output to the display 22. As the display 22, for example, an LCD or an EL (Electro-Luminescence) display can be used.

  The operation button detection circuit 24 outputs an operation signal or operation data corresponding to the operation of the operation button 26a described above to the CPU 12.

  The human detection sensor 28 is a distance sensor for detecting whether or not a person (user) is present in the first range A (see FIG. 3) set around the image forming apparatus 10. Output. For example, as the distance sensor, an infrared sensor, an ultrasonic sensor, a laser distance sensor, or the like is used. The CPU 12 determines whether a person exists in front of the image forming apparatus 10 according to whether the distance indicated by the distance data output from the person detection sensor 28 is within a predetermined distance that defines the first range A. To do. Therefore, it can be said that the first range A is a range set to determine whether or not there is a person in front of the image forming apparatus 10 (the apparatus main body 36 and the out-body discharge tray 40b).

  As the human detection sensor 28, a floor sensor (pressure sensor) can be used instead of the distance sensor. In this case, a floor sensor is provided in the range of the floor surface corresponding to the first range A of the image forming apparatus 10, and the CPU 12 determines whether there is a person in the first range A based on the output of the floor sensor. Judging.

  The paper discharge sensors 50 are the first paper discharge sensor 50a and the second paper discharge sensor 50b described above, and are comprehensively shown in FIG. As the paper discharge sensor 50, a general-purpose optical sensor or a contact sensor can be used. For example, when a reflective optical sensor is used as the paper discharge sensor 50, the paper discharge sensor 50 has a light emitting unit and a light receiving unit. When there is no paper in the in-body discharge tray 40a and the out-of-case discharge tray 40b, the light output from the light emitting unit is not reflected and the reflected light is not incident on the light receiving unit. Therefore, the paper discharge sensor 50 is turned on, and data indicating that it is turned on is output to the CPU 12. On the other hand, when there is a sheet in the in-body discharge tray 40a and the out-body discharge tray 40b, the light output from the light emitting unit is reflected by the sheet, and the reflected light is incident on the light receiving unit. Accordingly, the paper discharge sensor 50 is turned off, and data indicating that it is turned off is output to the CPU 12. Based on the output of the paper discharge sensor 50, the CPU 12 determines whether there is any discharged paper in the in-cylinder paper discharge tray 40a or the external paper discharge tray 40b.

  The power control circuit 52 is a control circuit for supplying power (electric power) to each component of the image forming apparatus 10 in accordance with an instruction from the CPU 12. The power supply control circuit 52 steps down and rectifies the commercial power supply, and supplies and stops a predetermined DC voltage corresponding to each component.

  The CPU 12 controls at least the operation state of the image forming apparatus 10. In the first embodiment, the image forming apparatus 10 has an operation state of a power saving state (power saving mode) in which power consumption is restricted and a normal state (normal mode) in which power consumption is not restricted. For example, in the normal mode, the CPU 12 controls the power control circuit 52 to supply power to all components of the image forming apparatus 10. However, power is not supplied to the paper discharge sensor 50 (50a or 50b) provided in the paper discharge tray 40 (40a or 40b) that is not used.

  On the other hand, in the power saving mode, the CPU 12 controls the power control circuit 52 to control the CPU 12, the power saving button included in the operation panel 26, the operation button detection circuit 24 described later, and necessary sensors (in this first embodiment, Power is supplied to the human detection sensor 28 and the paper discharge sensor 50). However, in the power saving mode, the power consumption of the image forming apparatus 10 is controlled to be equal to or lower than a first predetermined value (for example, several percent of the maximum power consumption). Therefore, the type and number of components to which power is supplied in the power saving mode are determined in consideration of the first predetermined value and the power consumption of each component. When the image forming apparatus 10 is connected to a network, power is also supplied to a connection circuit for connecting to the network in the power saving mode.

  Note that the electrical configuration of the image forming apparatus 10 shown in FIG. 2 is merely an example, and is not limited to this.

  FIG. 3 is a plan view for explaining the first range A set around the image forming apparatus 10. FIG. 4 is a plan view showing a case where there is no paper in the paper discharge tray 40 and there is a person in the first range A. FIG. 5 is a plan view showing a case where there is a sheet in the sheet discharge tray 40 and a person exists in the first range A. FIG.

  As illustrated in FIG. 3, the first range A is a range in which there is a possibility that there is a person who may use (operate) the image forming apparatus 10. As an example, the first range A is a semicircle having a first distance L <b> 1. Defined. However, the first distance L1 is a distance in the horizontal direction from the center of the front surface of the apparatus main body 36 of the image forming apparatus 10. In the first embodiment, the outside discharge tray 40b from the center of the front surface of the apparatus main body 36 is used. It is set to a length that includes the length to the right edge of. That is, in the first embodiment, the first range A is the front side of the image forming apparatus 10 (the apparatus main body 36 and the out-body discharge tray 40b), and the position where the image forming apparatus 10 can be operated (for example, the operation It is set to a range in which a person existing at a position where the hand can reach the panel 26 can be detected.

  However, as described above, the size and shape of the first range A are on the front side of the image forming apparatus 10 and are within a range in which a person existing at a position where the image forming apparatus 10 can be operated can be detected. These can be changed as appropriate. Although the detailed description is omitted, the number of the human detection sensors 28 is not limited to one as long as it can detect a person existing in the set first range A.

  It should be noted that the detectable range of the human detection sensor 28 only needs to include the first range A and does not have to coincide with the first range A. Further, when a fixed obstacle exists in the first range A, the obstacle may be excluded from the detection result in advance.

  As shown in FIG. 4, when a person is present in the first range A, distance data corresponding to a distance shorter than the first distance L <b> 1 is output from the person detection sensor 28 to the CPU 12. When the CPU 12 receives (acquires) distance data of a distance shorter than the first distance L1, the CPU 12 determines that there is a person in the first range A. When no person is present in the first range A, distance data corresponding to a distance longer than the first distance L1 is output from the human detection sensor 28 to the CPU 12. When the CPU 12 receives distance data of a distance longer than the first distance L1, the CPU 12 determines that there is no person in the first range A.

  Although detailed description is omitted, in the first embodiment, when the distance data of the distance equal to the first distance L1 is received, the CPU 12 determines that a person exists in the first range A. is there. However, in this case, the CPU 12 may determine that there is no person in the first range A.

  Although detailed explanation is omitted, when the CPU 12 receives distance data corresponding to a distance shorter than the first distance L1 after receiving distance data corresponding to a distance longer than the first distance L1, It is determined that the first range A is entered from outside the first range A. On the other hand, when the CPU 12 receives the distance data corresponding to the distance shorter than the first distance L1 and then receives the distance data corresponding to the distance longer than the first distance L1, the person first moves from the first range A to the first. It is determined that it has gone out of range A.

  In the image forming apparatus 10 having such a configuration, for example, when the image forming apparatus 10 is not operated continuously for a predetermined time or when the power saving button is pressed in the normal mode, the image forming apparatus 10 is shifted to the power saving mode. In such an image forming apparatus 10, for example, when it is detected that there is a person in the first range A in the power saving mode, the normal mode can be restored (transition). The reason for this is to start up the image forming apparatus 10 as soon as possible and shorten the time until the user starts the operation as much as possible.

  However, in this case, when a person who passes around the image forming apparatus 10 is detected, and a person who has just come to pick up the paper discharged to the paper discharge tray 40 of the image forming apparatus 10 is detected. Even in this case, the image forming apparatus 10 transitions to the normal mode. That is, the image forming apparatus 10 may be activated even when it is not necessary. For this reason, useless power consumption occurs.

  In order to eliminate such waste, it is possible not only to determine whether there is a person around the image forming apparatus 10 but also to shift to the normal mode when the user performs a predetermined motion operation. . However, in this case, it is necessary to provide an apparatus or sensor for detecting a predetermined motion operation, and the image forming apparatus 10 itself becomes expensive. The same applies to the case where the human detection sensor 28 and the sensor for detecting a predetermined motion operation are shared. In addition, the user is forced to perform a predetermined motion operation, which is troublesome.

  Therefore, in the first embodiment, an expensive sensor is not provided, and the normal mode is appropriately restored without forcing the user to perform a special operation.

  Specifically, the image forming apparatus 10 is set to the power saving mode. As shown in FIG. 5, when there is a sheet in the sheet discharge tray 40, it is determined that there is a person in the first range A. Even if it detects, it does not change to normal mode. In this case, in the image forming apparatus 10, it is determined that a person has come to pick up the paper on the paper discharge tray 40, and the power saving mode is maintained.

  Thereafter, when it is detected that there is no paper in the paper discharge tray 40 and there is a person in the first range A for a predetermined time (for example, 5 to 10 seconds) or more, this person (user) is It is determined that there is an intention to use the image forming apparatus 10, and the image forming apparatus 10 is shifted to the normal mode. However, the image forming apparatus 10 is maintained in the power saving mode at least until a predetermined time has elapsed.

  Further, the image forming apparatus 10 is set to the power saving mode, and as shown in FIG. 4, when there is no sheet in the sheet discharge tray 40, it is detected that there is a person in the first range A. Then, the image forming apparatus 10 is shifted to the normal mode.

  In such a case, a person may simply be detected by passing around the image forming apparatus 10. Therefore, in the first embodiment, when it is determined whether or not there is a person in the first range A, the distance corresponding to a distance shorter than the first distance L1 continuously for a predetermined time (for example, several seconds) or more. When data is detected, it is determined that there is a person in the first range A.

  When the power saving mode is set and there is no person in the first range A, the normal mode is not changed regardless of whether or not there is paper in the paper discharge tray 40.

  The above-described operation of the image forming apparatus 10 is realized by the CPU 12 executing an information processing program stored in the RAM 14. Specific processing will be described later with reference to a flowchart.

  FIG. 6 is an illustrative view showing one example of a memory map 70 of the RAM 14 shown in FIG. As shown in FIG. 6, the RAM 14 includes a program storage area 72 and a data storage area 74. As described above, an information processing program is stored in the program storage area 72 of the RAM 14. The information processing program includes a display program 72a, an operation detection program 72b, a person detection program 72c, a paper discharge detection program 72d, a power supply control program 72e, and a print program 72f.

  The display program 72 a is a program for displaying various screens such as an operation screen on the display 22.

  The operation detection program 72b is a program for acquiring touch coordinate data output from the touch panel 20 and detecting that various icons included in various screens such as an operation screen displayed on the display 22 are operated. is there. The operation detection program 72b is also a program for detecting an operation input from the operation button 26a.

  The human detection program 72c acquires the distance data output by the human detection sensor 28, and depending on whether the distance indicated by the distance data is within a predetermined distance (the first distance L1 in the first embodiment). This is a program for determining whether a person exists in front of the image forming apparatus 10.

  The paper discharge detection program 72d is a program for determining whether or not there is a paper discharged to the paper discharge tray 40 in accordance with data output from the paper discharge sensor 50.

  The power supply control program 72e is discharged to the discharge tray 40 obtained by executing the detection result of whether or not there is a person in the first range A obtained by executing the person detection program 72c and the discharge detection program 72d. This is a program for switching from the power saving mode to the normal mode according to the detection result of whether or not there is a sheet. The power supply control program 72e is also a program for switching to the power saving mode when the image forming apparatus 10 is not operated continuously for a predetermined time or more in the normal mode and when the power saving button is operated.

  However, as described above, in the normal mode, the CPU 12 controls the power supply control circuit 52 to perform image formation excluding the paper discharge sensor 50 (50a or 50b) provided on the paper discharge tray 40 (40a or 40b) that is not used. Power is supplied to all components of the device 10. On the other hand, in the power saving mode, the CPU 12 supplies power to the CPU 12, the power saving button included in the operation panel 26, the operation button detection circuit 24, the person detection sensor 28, and the paper discharge sensor 50.

  The print program 72f is a program for forming a multi-color or single-color image on a recording medium (paper) according to image data input from the outside or image data read from a document by a scanner.

  Although not shown, the program storage area 72 also stores programs for selecting and executing various functions.

  In the data storage area 74 of the RAM 14, touch coordinate data 74a, operation screen data 74b, image data 74c, and the like are stored.

  The touch coordinate data 74a is touch coordinate data detected (acquired) according to the operation detection program 72b, and is stored according to time series.

  The operation screen data 74 b is image data regarding an operation screen displayed on the display 22.

  The image data 74c is image data corresponding to, for example, a print page. However, the image data is read from the HDD or the like and developed (stored) in the RAM 14.

  Although illustration is omitted, the data storage area 74 stores other data necessary for execution of the information processing program such as operation data from the operation button 26a of the operation panel 26, or for execution of the information processing program. Necessary timers (counters) and registers are provided.

  FIG. 7 is a flowchart showing an example of power control processing of the image forming apparatus 10 shown in FIG. This power control process is executed when the image forming apparatus 10 is in the power saving mode.

  As shown in FIG. 7, when starting the power supply control process, the CPU 12 determines whether or not there is a person in the first range A in step S1. Here, the CPU 12 obtains the distance data detected by the human detection sensor 28, and as described above, the distance data corresponding to a distance shorter than the first distance L1 continues for a predetermined time (for example, several seconds) or longer. When detected (acquired), it is determined that a person exists in the first range A. On the other hand, when the CPU 12 detects distance data corresponding to a distance longer than the first distance L1, the CPU 12 detects distance data corresponding to a distance shorter than the first distance L1, but does not continue for a predetermined time or longer. , It is determined that there is no person in the first range A.

  If “NO” in the step S1, that is, if it is determined that there is no person in the first range A, the process returns to the same step S1 as it is. However, if “NO” in the step S1, the CPU 12 may wait for a predetermined time (for example, several seconds to several tens of seconds) before returning to the step S1. This predetermined time can be appropriately set according to the frequency of use of the image forming apparatus 10.

  On the other hand, if “YES” in the step S1, that is, if it is determined that there is a person in the first range A, the data detected by the paper discharge sensor 50 is acquired in the step S3, and the paper is stored in the paper discharge tray 40. Determine if there is any ejected paper. If “YES” in the step S3, that is, if it is determined that there is a sheet discharged to the paper discharge tray 40, the process waits for a predetermined time (for example, several seconds to several tens of seconds) in a step S5, and then proceeds to the step S1. Return.

  Note that the reason for waiting for a predetermined time in step S5 is to prevent the normal mode when the user who has just come to pick up the discharged paper picks up the paper. Another reason is to appropriately shift to the normal mode when the user uses the image forming apparatus 10 after removing the paper.

  On the other hand, if “NO” in the step S3, that is, if it is determined that there is no sheet discharged to the paper discharge tray 40, the process shifts to the normal mode in a step S7, and the power control process is ended. That is, in step S <b> 7, the CPU 12 controls the power supply control circuit 52 to supply power to all components of the image forming apparatus 10 except for the paper discharge sensor 50 that is not used.

  According to the first embodiment, when the power saving mode is set, when there is a person around the image forming apparatus 10 and there is no paper in the paper discharge tray 40, the mode is shifted to the normal mode. Even if a person who just takes out the formed paper from the paper discharge tray 40 is detected, the mode does not shift to the normal mode. As described above, since only the presence / absence of the paper is detected, the normal mode is shifted to the user as necessary without forcing the user to perform another operation, so that appropriate power control can be performed and wasteful power is consumed. Can be prevented.

Further, according to the first embodiment, a general-purpose distance sensor or pressure sensor can be used as the human detection sensor 28, and it is not necessary to use an expensive sensor such as a digital camera. Therefore, the image forming apparatus 10 is expensive. It can also be avoided.
[Second Embodiment]
In the image forming apparatus 10 of the second embodiment, when a user who has picked up paper uses the image forming apparatus 10, the time until the user starts using the image forming apparatus 10 is shortened. Other than the above, the image forming apparatus 10 is the same as the image forming apparatus 10 of the first embodiment. Therefore, different contents will be described in detail, and description of overlapping contents will be omitted or simply described.

  The image forming apparatus 10 of the second embodiment has two types of power saving modes having different power consumption levels. Specifically, the image forming apparatus 10 consumes more power than the first power saving mode (first power saving state) having the same power consumption amount as the power saving mode in the first embodiment. A second power saving mode (second power saving state).

  In the second power saving mode, the power consumption of the image forming apparatus 10 is controlled to be equal to or less than a second predetermined value that is larger than the first predetermined value. However, the second predetermined value is smaller than the power consumption of the image forming apparatus 10 in the normal mode. For example, in the second power saving mode, power is also supplied to some components that are not supplied with power in the first power saving mode. That is, in the second embodiment, the CPU 12 controls the power supply control circuit 52 so that the CPU 12, the power saving button, the operation button detection circuit 24, and the necessary sensors (in the second embodiment, at least the human detection sensor 28 and In addition to supplying power to the paper discharge sensor 50), power is supplied to the entire operation panel 26 including the fixing device of the image forming unit 32 and the power saving button.

  Also in the second embodiment, similarly to the first embodiment, when the image forming apparatus 10 is not operated continuously for a predetermined time or when the power saving button is pressed in the normal mode, the mode is changed to the first power saving mode. The

  Similarly to the first embodiment, in the first power saving mode, when there is no sheet in the sheet discharge tray 40, the image forming apparatus 10 detects that there is a person in the first range A when the sheet is detected. The first power saving mode is changed to the normal mode.

  However, when it is detected in the first power saving mode that there is a person in the first range A, if there is a sheet on the paper discharge tray 40, the image forming apparatus 10 starts from the first power saving mode. Transition to the second power saving mode.

  In the second power saving mode, as described above, power is supplied to the fixing device of the image forming unit 32 and the temperature of the fixing device of the image forming unit 32 is kept high. That is, in the second power saving mode, preheating is performed so that the fixing device of the image forming unit 32 can be used. Accordingly, when the transition from the second power saving mode to the normal mode is performed, the time required until the image forming apparatus 10 can be used can be shortened compared to the case where the transition from the first power saving mode to the normal mode is performed.

  In the second power saving mode, if a state where a person (user) exists in the first range A continues for a predetermined time (for example, 5 seconds to 10 seconds) or more, the user intends to use the image forming apparatus 10. Transition to normal mode. However, in the second power saving mode, if the user leaves the first range A before the predetermined time elapses, it is determined that the user has just come to pick up the paper, and the second power saving mode is set. Transition from the power mode to the first power saving mode is made.

  However, as described above, in the second power saving mode, since power is supplied to the operation panel 26, when any user on the operation panel 26 is pressed when the user exists in the first range A, When there is a touch input to the touch panel 20, it is possible to make a transition to the normal mode even before a predetermined time has elapsed.

  Further, when the image forming apparatus 10 includes a sensor other than the human detection sensor 28 and the paper discharge sensor 50 such as a document detection sensor, a tray open / close detection sensor, a door open / close detection sensor, and an external memory mounting sensor, the second power saving These other sensors are also powered in mode. In this case, when it is determined that the user uses the image forming apparatus 10 according to the detection results of other sensors, the second power saving mode may be changed to the normal mode.

  FIG. 8 is a flowchart showing an example of the power supply control process in the second embodiment. Hereinafter, the power supply control process of the CPU 12 in the second embodiment will be described with reference to the flowchart shown in FIG. 8, but the processes in steps S1, S3, and S7 are the same as those in the first embodiment, and therefore duplicated contents. Will be briefly described.

  The power supply control process of the second embodiment is executed when the image forming apparatus 10 is in the first power saving mode, as in the first embodiment.

  As shown in FIG. 8, when starting the power supply control process, the CPU 12 determines whether or not there is a person in the first range A in step S1. If “NO” in the step S1, the process returns to the same step S1. On the other hand, if “YES” in the step S1, it is determined whether or not there is paper in the paper discharge tray 40 in a step S3. If “NO” in the step S3, the process proceeds to a step S7.

  On the other hand, if “YES” in the step S3, the process transits to a second power saving mode in a step S31. That is, the CPU 12 controls the power supply control circuit 52 to control the CPU 12, the operation button detection circuit 24, the operation panel 26, the fixing device of the image forming unit 32, and necessary sensors (in this second embodiment, at least a human detection sensor). 28 and the paper discharge sensor 50).

  In subsequent step S33, the timer is reset and started, and in step S35, it is determined whether or not a person exists in the first range A. However, the timer is a timer for counting the duration of the state in which a person is present in the first range A, and is provided inside the image forming apparatus 10 (CPU 12 or RAM 14), although not shown.

  If “NO” in the step S35, the process transits to the first power saving mode in a step S37, and the process returns to the step S1. On the other hand, if “YES” in the step S35, it is determined whether or not a predetermined time has elapsed in a step S39. Specifically, the CPU 12 determines whether or not the state in which a person exists in the first range A has continued for a predetermined time or more according to the count value of the timer that started counting in step S33.

  If “NO” in the step S39, that is, if the state where the person exists in the first range A has not continued for the predetermined time or more, the process returns to the step S35. On the other hand, if “YES” in the step S39, that is, if the state where the person exists in the first range A continues for a predetermined time or more, the process transits to the normal mode in the step S7.

  According to the second embodiment, the human detection sensor 28 determines that there is a person in the first range A, and the discharge sensor 50 determines that there is a sheet discharged to the discharge tray 40. In this case, since the second power saving mode in which the power consumption is larger than the first predetermined value is set, when the user who has picked up the sheet uses the image forming apparatus 10 as it is, the user forms the image forming apparatus 10. The time until the start of use can be shortened.

Further, according to the second embodiment, in the second power saving mode, when a state where a person (user) exists in the first range A continues for a predetermined time or longer, the user intends to use the image forming apparatus 10. It is determined that there is, and the normal state is set. Therefore, since it shifts to a normal state as needed without forcing the user to perform another operation, appropriate power control can be performed.
[Third embodiment]
In the third embodiment, the image forming apparatus 10 sets the second range B different from the first range A when there is paper in the outside-sheet discharge tray 40b in the power saving mode. The same as in the first embodiment, except that the person who has just come to the paper discharge tray 40b and the person (user) who intends to use the image forming apparatus 10 are differentiated and the power is controlled. Therefore, different contents will be described, and redundant description will be omitted or simply described.

  FIG. 9 is a plan view for explaining an example of the first range A and the second range B set in the third embodiment. FIG. 10 is a plan view for explaining another example of the first range A and the second range B set in the third embodiment. FIG. 11A is a plan view for explaining an example of the first range A set when two human detection sensors 28 are used in the third embodiment. FIG. 11B is a plan view of FIG. It is a top view for demonstrating an example of the 2nd range B with respect to 1st range A of A).

  For example, in the power saving mode, when there is paper on the outside-body discharge tray 40b, the range from the first range A to the body is considered as a range where there is a possibility that there is a person who may use (operate) the image forming apparatus 10. A second range B excluding the front range of the outer paper discharge tray 40b is set. In the third embodiment, the operation panel 26 is formed on the front surface of the apparatus main body 36 with the same or substantially the same width as that of the apparatus main body 36. This is because a person who has come to pick up the paper discharged to the paper discharge tray 40b is not detected.

  However, in the third embodiment, as in the first embodiment, there is a person who may use the image forming apparatus 10 in the power saving mode when there is no paper in the outside-body discharge tray 40b. Then, the first range A is set as a possible range.

  Specifically, as in the first embodiment, the first range A is set on the front side of the image forming apparatus 10. In other words, a semicircular first range A is set on the front side of the image forming apparatus 10 with the human detection sensor 28 as the center and the first distance L1 as the radius. For example, as shown in FIG. 9, the human detection sensor 28 is provided at the right end portion of the front surface of the operation panel 26 (device main body 36), and the first range A is set around the right end portion of the front surface of the image forming apparatus 10. The

  As described above, in the power saving mode, when there is a sheet in the outside-body discharge tray 40b, the second range B is set by excluding the range on the front side of the outside-body discharge tray 40b from the first range A. The Therefore, for example, as shown in FIG. 9, a range corresponding to the left half of the first range A is set as the second range B. In this way, the second range B narrower than the first range A is set.

  In order to detect a person existing in the second range B as shown in FIG. 9, in the third embodiment, a shielding plate movable in the front-rear direction is provided on the right side of the human detection sensor 28. So that the right half of the first range A is excluded from the detection range.

  However, this is an example and should not be limited. For example, by providing a shielding member in which a cylinder is cut in half in the longitudinal direction along the central axis of the cylinder so as to surround the human detection sensor 28, and by rotating the shielding member around the central axis, for example, The right half of the human detection sensor 28 may be covered, and the right half of the first range A may be excluded from the detection range. In such a case, when the first range A is set, the shielding portion is disposed so as to cover the back surface of the human detection sensor 28.

  As another method for setting the second range B that is narrower than the first range A, there is a method in which a laser distance sensor or an ultrasonic sensor that detects not only the distance but also the direction (angle) is used as the human detection sensor 28. In such a case, when the second range B is set, the distance data including the direction (angle) data of the range corresponding to the right half of the first range A is ignored.

  Moreover, the method of setting the 2nd range B narrower than the 1st range A does not need to be limited to said method. As shown in FIG. 10, the second range B having a radius smaller than the first range A can be set. However, in such a case, the human detection sensor 28 is arranged in the center of the front surface of the operation panel 26 (device main body 36) in order to set the semicircular second range B. As can be seen from FIG. 10, the radius (second distance) L2 of the semicircle that defines the second range B is the distance from the center of the apparatus main body 36 to the left and right ends (half the width of the apparatus main body 36). ) Is set to the same or nearly the same.

  In addition, in the setting of said 2nd range B, it is made narrower than the 1st range A, However It is not necessary to be limited to this. For example, by providing a mechanism for rotating the human detection sensor 28 in the horizontal direction and changing the direction of the human detection sensor 28 to the left side, the detection range of the human detection sensor 28 is moved, and the outside-body discharge tray 40b. May be excluded from the detection range.

  In addition, in the above examples, the case where one person detection sensor 28 is used is shown. However, when a plurality of person detection sensors 28 are used, as shown in FIGS. 11A and 11B, The first range A and the second range B can be set. Hereinafter, in order to distinguish between the two human detection sensors 28, one is called a human detection sensor 28a and the other is called a human detection sensor 28b.

  For example, as shown in FIG. 11A, the human detection sensor 28a is provided on the front surface of the operation panel 26 (device main body 36) and on the left side of the center, and the human detection sensor 28b is provided on the operation panel 26 (device main body 36). ) On the right side of the center.

  In the third embodiment, the first range A includes a semicircular range (second range) B centered on the human detection sensor 28a and a semicircular range centered on the human detection sensor 28b (third Range) is determined to be a range synthesized with C. For example, the sizes of the second range B and the third range C are determined so that the first range A of the third embodiment is approximately the same size as the first range A shown in the first embodiment. A radius (third distance L3) is set. Further, as described later, when the second range B is set, the arrangement position of the human detection sensor 28a and the third position are set so that the second range B does not protrude from the front side of the out-body discharge tray 40b. A distance L3 is determined. That is, also in the third embodiment, the first range A is set to a range in which a person existing on the front side of the image forming apparatus 10 (the apparatus main body 36 and the out-body discharge tray 40b) can be detected.

  The arrangement position of the human detection sensor 28b and the third distance L3 are set such that the third range C is set to a position where a person existing on the front side of the out-body discharge tray 40b can be detected.

  Further, when the human detection sensor 28a and the human detection sensor 28b are used, the human detection sensor 28b when the second discharge sensor 50b determines that there is a sheet in the outside discharge tray 40b in the power saving mode. Is turned off, and the second range B is set as shown in FIG.

  Also in the third embodiment, as in the first embodiment, in the power saving mode, when there is no sheet in the out-body discharge tray 40b, the CPU 12 determines whether there is a person (user) in the first range A. Judge whether. When a user exists in the first range A, it is determined that the user has an intention to use the image forming apparatus 10 and the normal mode is set.

  On the other hand, in the power saving mode, when there is a sheet in the out-body discharge tray 40b, the CPU 12 determines whether or not there is a person (user) in the second range B. When a user exists in the second range B, it is determined that the user has an intention to use the image forming apparatus 10 and the normal mode is set. As described above, the second range B is set so as to exclude at least the range on the front side of the out-body discharge tray 40b. Therefore, a person who has just come to the outside-body discharge tray 40b passes the second range B or does not enter the second range B, and therefore has a willingness to use the image forming apparatus 10. Is not determined, and the power saving mode is maintained.

  FIG. 12 is a flowchart showing an example of the power control process of the CPU 12 in the third embodiment. This power control process is executed when the image forming apparatus 10 is in the power saving mode, as in the first embodiment. The same processing as that described in the power supply control processing (FIG. 7) of the first embodiment will be briefly described. Further, the power supply control process of the third embodiment includes a process of setting the first range A and the second range B, but the setting method of the first range A and the second range B is any one of the methods described above. Adopted.

  As shown in FIG. 12, when the power supply control process is started, the CPU 12 determines in step S51 whether or not there is a sheet discharged to the out-body discharge tray 40b.

  If “YES” in the step S51, the second range B is set in a step S53 as a range in which there is a possibility that there is a person who may operate the image forming apparatus 10. In step S55, it is determined whether or not there is a person in the second range B. If “NO” in the step S55, that is, if there is no person in the second range B, the process returns to the step S51. On the other hand, if “YES” in the step S55, that is, if there is a person in the second range B, it is determined that the person is willing to use the image forming apparatus 10, and in the normal mode in the step S61. The power control process ends.

  If “NO” in the step S51, the first range A is set in a step S57 as a range in which there is a possibility that there is a person who may operate the image forming apparatus 10. In step S59, it is determined whether or not there is a person in the first range A. If “NO” in the step S59, that is, if there is no person in the first range A, the process returns to the step S51. On the other hand, if “YES” in the step S59, that is, if there is a person in the first range A, it is determined that the person has an intention to use the image forming apparatus 10, and the normal mode is set in the step S61. A transition is made and the power supply control process ends.

  According to the third embodiment, in the power saving mode, when there is a sheet on the outside discharge tray 40b, the second range B different from the first range A is set to the front side of the outside discharge tray 40b. And a person who is willing to use the image forming apparatus 10 (user) who has just come to pick up paper on the outside-body discharge tray 40b. And appropriate power supply control can be performed, and wasteful power consumption can be prevented.

  As shown in the third embodiment, the aspect of setting the second range B different from the first range A can also be applied to the second embodiment. In this case, the second range B is set when the mode is changed to the second power saving mode. Therefore, unlike the second embodiment, when it is determined that there is a person in the second range B, it is possible to shift to the normal mode without waiting for a predetermined time.

  Specifically, as shown in FIG. 13, the CPU 12 executes a power supply control process. Hereinafter, although the power supply control processing will be described with reference to FIG. 13, the contents already described will be briefly described. In FIG. 13, the same processes as those shown in FIG. 8 are denoted by the same reference numerals.

  As shown in FIG. 13, when starting the power supply control process, the CPU 12 determines whether or not there is a person in the first range A in step S1. If “NO” in the step S1, the process returns to the same step S1. On the other hand, if “YES” in the step S1, it is determined whether or not there is paper in the outside-body discharge tray 40b in a step S3. If “NO” in the step S3, the process proceeds to a step S7.

  On the other hand, if “YES” in the step S3, the process transits to a second power saving mode in a step S31. That is, the CPU 12 controls the power supply control circuit 52 to control the CPU 12, the operation button detection circuit 24, the operation panel 26, the fixing device of the image forming unit 32, and necessary sensors (here, at least the human detection sensors 28a and 28b and Power is supplied to the paper discharge sensor 50).

  In the subsequent step S71, the second range B is set as a range in which there is a possibility that there is a person who may operate the image forming apparatus 10. In step S73, it is determined whether or not there is a person in the second range B. If “NO” in the step S73, the process returns to the step S1. On the other hand, if “YES” in the step S73, the process transits to the normal mode in a step S7, and the power supply control process is ended.

  Note that the specific numerical values, screen configurations, and the like given in the above-described embodiments are merely examples, and can be appropriately changed according to actual products.

  Moreover, as long as the same result is obtained for each step of the flowchart shown in the above-described embodiment, the processing order can be changed as appropriate.

10 ... Image forming apparatus 12 ... CPU
14 ... RAM
28... Human detection sensor 36... Device main body 40... Paper discharge tray 50.

Claims (17)

A first power-saving state and power consumption that includes an image forming unit and an apparatus main body that includes a discharge unit that discharges a recording medium on which an image is formed by the image forming unit. An image forming apparatus having a normal state that is not limited,
Presence determination means for determining whether a person is present in a first range set around the apparatus main body in the first power saving state;
Presence / absence determining means for determining whether or not there is a recording medium discharged to the discharge portion; and the presence determination means determines that there is a person in the first range, and An image forming apparatus comprising: a state setting unit that sets the recording medium to the normal state when it is determined that there is no discharged recording medium. A second power saving state in which power consumption is greater than the predetermined value;
The state setting means determines that there is a person in the first range by the presence determination means and determines that there is the recording medium discharged to the paper discharge unit by the presence determination means. 2. The image forming apparatus according to claim 1, wherein the image forming apparatus is set to the second power saving state and is set to the normal state when a predetermined condition is satisfied in the second power saving state.   The image forming apparatus according to claim 2, wherein the predetermined condition includes that the second power saving state continues for a predetermined time. Range setting for setting a second range different from the first range when the presence / absence determination unit determines that there is a recording medium discharged to the paper discharge unit in the first power saving state. Further comprising means,
The presence determination means determines whether or not a person is present in the second range when the second range is set by the range setting means;
The image forming apparatus according to claim 1, wherein the state setting unit sets the normal state when the presence determination unit determines that a person is present in the second range.   The image forming apparatus according to claim 4, wherein the range setting unit sets the second range that is narrower than the first range.   The image forming apparatus according to claim 4, wherein the range setting unit sets the second range excluding the periphery of the paper discharge unit in the first range.   The image forming apparatus according to claim 1, wherein the recording medium discharged to the discharge unit includes a recording medium on which an image corresponding to data received from the outside is formed by the image forming unit.   The image forming apparatus according to claim 1, wherein the setting unit sets the first power saving state when the image forming apparatus is not operated for a predetermined time. A first power-saving state and power consumption that includes an image forming unit and an apparatus main body that includes a discharge unit that discharges a recording medium on which an image is formed by the image forming unit. An image forming apparatus having a normal state that is not limited,
Presence determination means for determining whether a person is present in a first range set around the apparatus main body in the first power saving state;
Presence / absence judging means for judging whether or not there is a recording medium ejected in the ejection section;
A range setting unit that sets a second range that is narrower than the first range when the presence determination unit determines that the recording medium discharged to the paper discharge unit is present, and the presence determination unit An image forming apparatus comprising: a state setting unit that sets the normal state when it is determined that a person is present in the first range. A second power saving state in which power consumption is greater than the predetermined value;
The setting means determines that there is a person in the first range by the presence determination means and determines that the recording medium discharged to the paper discharge unit is present by the presence determination means The image forming apparatus according to claim 9, wherein when the second power saving state is set and a predetermined condition is satisfied in the second power saving state, the normal state is set.   The image forming apparatus according to claim 10, wherein the predetermined condition is set to the normal state including that the second power saving state has continued for a predetermined time.   The image forming apparatus according to claim 9, wherein the recording medium discharged to the discharge unit includes a recording medium on which an image corresponding to data received from the outside is formed by the image forming unit.   The image forming apparatus according to claim 9, wherein the setting unit sets the first power saving state when the image forming apparatus is not operated for a predetermined time. A first power-saving state and power consumption that includes an image forming unit and an apparatus main body that includes a discharge unit that discharges a recording medium on which an image is formed by the image forming unit. A control program for an image forming apparatus having a normal state that is not limited,
A computer of the image forming apparatus;
Presence determination means for determining whether a person is present in a first range set around the apparatus main body in the first power saving state;
Presence / absence determining means for determining whether or not there is a recording medium discharged to the discharge portion; and the presence determination means determines that there is a person in the first range, and A control program for an image forming apparatus that causes the setting medium to be set to the normal state when it is determined that there is no recording medium ejected to a part. A first power-saving state and power consumption that includes an image forming unit and an apparatus main body that includes a discharge unit that discharges a recording medium on which an image is formed by the image forming unit. A control program for an image forming apparatus having a normal state that is not limited,
A computer of the image forming apparatus;
Presence determination means for determining whether a person is present in a first range set around the apparatus main body in the first power saving state;
Presence / absence judging means for judging whether or not there is a recording medium ejected in the ejection section;
A range setting unit that sets a second range that is narrower than the first range when the presence determination unit determines that the recording medium discharged to the paper discharge unit is present, and the presence determination unit A control program for an image forming apparatus, which is caused to function as a state setting unit for setting to the normal state when it is determined that a person exists in a first range. A first power-saving state and power consumption that includes an image forming unit and an apparatus main body that includes a discharge unit that discharges a recording medium on which an image is formed by the image forming unit. A control method of an image forming apparatus having a normal state without restriction,
The computer of the image forming apparatus
(A) In the first power saving state, determine whether there is a person in a first range set around the device body;
(B) It is determined whether or not there is a recording medium discharged to the discharge unit, and (c) it is determined in step (a) that there is a person in the first range, and the step (b ), The image forming apparatus is set to the normal state when it is determined that there is no recording medium discharged to the paper discharge unit. A first power-saving state and power consumption that includes an image forming unit and an apparatus main body that includes a discharge unit that discharges a recording medium on which an image is formed by the image forming unit. A control method of an image forming apparatus having a normal state without restriction,
The computer of the image forming apparatus
(A) In the first power saving state, determine whether there is a person in a first range set around the device body;
(B) Determine whether there is a recording medium ejected in the ejection unit;
(C) when it is determined in step (a) that the recording medium discharged to the paper discharge unit is present, a second range narrower than the first range is set; and (d) the step A method for controlling an image forming apparatus, wherein the normal state is set when it is determined in (a) that a person is present in the first range.

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