JPS6221174A - Image forming device - Google Patents

Abstract

PURPOSE:To specify an erasure range and to take a copy while an original is turned over, and to eliminate a position shift, etc., and to improve the quality of formed images by providing an illuminating means which illuminates the entire surface of an original platen on the reverse surface of the original platen and illuminating the original platen by this illuminating means. CONSTITUTION:The original G is set along the fixed scale 21 of the original platen 2 while turned over, and the illumination lamp 139 is turned on to illuminate the entire surface of the original platen 2. Then while a spot light source 131 is turned on, a carriage 141 and the spot light source 131 are moved in a scanning direction (y-direction) and a motor 135 is driven to move the spot light source 131 at right angles (x-direction) to the scanning direction. At this time, light from the illumination lamp 139 is transmitted through the original G to view the original image and spot light, so the erasure range is specified and copying operation is performed while the original is turned over. Consequently, miscopying such as the position shift of the erasure range, etc., is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to an image forming apparatus applied to, for example, an electronic copying machine.

[Technical background of the invention and its problems]

Generally, an electronic copying machine has a function of copying an original image onto paper as is, or enlarging or reducing the original image and making a copy.

By the way, there may be unnecessary parts in the original image. Recently, a copying machine has been developed that specifies this unnecessary portion by irradiating a spot light from the back side of the document table and erases the image of this portion during copying.

In this type of copying machine, when specifying the area to be erased on a document, in order to easily recognize the specified area, the document is placed face up on the document table, the area to be erased is specified, and then the document is turned face down. It is designed to be set and copied. For this reason, when setting the original face down after specifying the erasing range, the setting position may shift from the position when the erasing range was specified, and the specified portion may not be erased securely when copying. This had some inconveniences, such as areas other than the specified portion being erased.

(Object of the invention) This invention was made based on the above circumstances,
The purpose of this is to be able to specify and erase a desired area of the original without changing the original setting position, and to improve the quality of the formed image without causing positional deviations in the formed image. The present invention aims to provide an image forming apparatus that can perform the following operations.

[Summary of the invention]

This invention illuminates a document image with a spotlight, moves this spotlight to designate an erasing range, and irradiates a photoreceptor drum with light corresponding to the designated erasing range to erase an electrostatic latent image. Or it erases the charge and forms an image.
In particular, an illumination means made of, for example, a fluorescent lamp is provided on the back side of the document table to illuminate the entire surface of the document table, and by illuminating the document table with this illumination means, it is possible to specify the erasing range and make copies while the document is turned over. This is what I did.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 12 and 13 schematically show an image forming apparatus of the present invention, such as a copying machine. That is, 1 is a main body of a copying machine, and a document table (transparent glass) 2 is fixed to the upper surface of the main body 1 to support a document. Fixed scales 21 and 22 are provided at both ends of the document table 2 in the longitudinal direction to serve as bit references for the document, and a document cover 11 and a work table 12 that can be opened and closed are provided near the document table 2. . The original placed on the original platen 2 is moved back and forth by an optical system consisting of an exposure lamp 4 and mirrors 5, 6, and 7 along the lower surface of the original platen 2 in the direction of arrow a. It is designed to be exposed and scanned.

In this case, mirror 6.7 moves at half the speed of mirror 5 so as to maintain the optical exposure length. The light reflected from the original by the scanning of the optical system, that is, the light reflected from the original by the light irradiation of the exposure lamp 4, is reflected by the mirror 5, 6, 7, passes through the variable magnification lens block 8, and is further reflected by the mirror 5.6.7. 9 and guided to the photoreceptor drum 10, so that an image of the document is formed on the surface of the photoreceptor drum 10.

The photosensitive drum 10 rotates in the direction of the arrow C shown in the figure, and the surface is first charged by the charging band M device 11, and then the image is exposed to slit light to form an electrostatic latent image on the surface. This electrostatic latent image is made visible by applying toner by a developing device 12.

On the other hand, the paper (transfer material) P is taken out one by one from the selected upper paper feed cassette 13 or lower paper feed cassette 14 by a delivery roller 15 or 16. The taken out paper P is guided to a pair of registration rollers 19 through a paper guide path 17 or 18, and guided to a transfer section by this pair of registration rollers 19. Here, the paper feed cassettes 13 and 14 are removably provided at the lower right end of the main body 1, and one of them can be selected from an operation panel to be described later. The cassette size of each of the paper feed cassettes 13 and 14 is detected by a cassette size detection switch 601 and 602, respectively. The cassette size detection switches 601 and 602 are composed of a plurality of microswitches that are turned on and off according to the insertion of cassettes of different sizes.

The paper P sent to the transfer section comes into close contact with the surface of the photoreceptor drum 10 at the transfer charger 20, so that the toner image on the photoreceptor drum 10 is transferred by the action of the charger 20. . This transferred paper P is transferred to the peeling charger 2
1, it is electrostatically separated from the photosensitive drum 10 and conveyed by the conveyor belt 22, and sent to a pair of fixing rollers 23 as a fixing device provided at the end of the conveyor belt 22, and by passing therethrough, the transferred image is is established. After fixing, the paper P is transferred to a tray 25 outside the main body 1 by a pair of paper ejection rollers 24.
It is designed to be discharged. Further, after the photoreceptor drum 10 after the transfer is charged, the residual toner on the surface is removed by the cleaner 27 after the charge is removed by the charger 26, and the residual image is erased by the charge removal lamp 28.
It is set to return to the initial state. Note that 29 is a cooling fan for preventing the temperature inside the main body 1 from rising. Also,
On the back side of the document table 2, in a portion corresponding to the fixed scales 21 and 22, there is an illumination lamp 139 that is turned on when specifying an erasing range of the document using a spot light, which will be described later, to illuminate the document table 2.
is provided.

FIG. 14 shows the operation panel 30 provided on the main body 1. 301 is a copy key for commanding the start of copying; 30
2 is a numeric keypad for setting the number of copies, etc.; 303 is a display section for displaying the operating status of each part and paper jams; 304 is a cassette selection key for selecting the upper and lower paper feed cassettes 13 and 14; 30s is a selected key. A cassette display section for displaying the cassette, 306 a magnification setting key for setting the enlargement and reduction magnification of copies in a predetermined relationship, 307 a zoom key for steplessly setting the enlargement and reduction magnification, and 30a for displaying the set magnification. A display section, 30s is a density setting section for setting the copy density, 30a, 30b, 30c, and 30d are operation keys for moving a spot light source that indicates the erase position of the original, which will be described later, and 30e is for inputting the coordinate position indicated by the spot light source. The position designation keys 3Qf and 30(:l are erasure range designation keys that designate the erasure range at the designated positions, respectively.

FIG. 15 shows an example of the drive source configuration of each drive unit of the copying machine configured as described above, and is composed of the following motors. That is, 31 is a lens motor, which is a motor for moving the position of the lens block 8 for performing magnification change. Reference numeral 32 denotes a mirror motor, which connects the mirror 5 and mirrors 6 and 7 for variable magnification.
This is a motor for changing the distance (optical path length) between the A scanning motor 33 is a motor for moving the exposure lamp 4, the mirror 5, and the mirror 6.7 for scanning the original. A shutter motor 34 is a motor for moving a shutter (not shown) for adjusting the charging width of the photosensitive drum 10 by the charger 11 during zooming. A developing motor 35 is a motor for driving the developing roller of the developing device 12 and the like. 36 is a drum motor, which is a motor for driving the photosensitive drum 10.

A fixing motor 37 is a motor for driving the paper transport path 22, the fixing roller pair 23, and the paper ejection roller pair 24. 38 is a paper feed motor, which is a motor for driving the delivery rollers 15 and 16. , 39
is a paper feeding motor, which is a motor for driving the pair of registration rollers 19. A fan motor 40 is a motor for driving the cooling fan 29.

FIG. 16 shows a drive mechanism for reciprocating the optical system. That is, the mirror 5 and the exposure lamp 4
is supported by a first carriage 411, and mirror 6.7 is supported by a second carriage 422, respectively, and these carriages 411, 412 are guided by guide rails 421, 422 and are movable in parallel in the direction of arrow a. That is, 4
Phase pulse motor 33 drives pulley 43. An endless belt 45 is connected between the pulley 43 and the idler pulley 44.
The mirror 5 is placed in the middle of this belt 45.
One end of the first carriage 411 that supports the is fixed. On the other hand, the second carriage 42 supporting the mirror 6.7
Two pulleys 47 and 47 are rotatably provided on the second guide portion 46 and spaced apart in the axial direction of the rail 422.
A wire 48 is wrapped around these pulleys 47, 47111.

One end of this wire 48 is fixed to a fixed part 49, and the other end is fixed to the fixed part 49 via a coil spring 50. Further, one end of the first carriage 41 is fixed to the middle part of the wire 48. therefore,
As the pulse motor 33 rotates, the belt 45 rotates, the first carriage 411 moves, and the second carriage 422 also moves accordingly. At this time, since the pulleys 47, 47 serve as movable pulleys, the second carriage 422 is moved in the same direction as the first carriage 411 at 1/2 the speed. In addition, the first and second carriages 4
The moving direction of 11.412 is controlled by switching the rotation direction of the pulse motor 33.

Further, on the document table 2, a copyable range corresponding to the specified paper is displayed. That is, the paper size specified by the paper selection key 304 is set to (Px, Py), and the magnification setting key 306 is set to ry-Py/KJ. Of this copyable range (xSy), the X direction is indicated by the pointers 51 and 52 arranged on the back surface of the document table 2, and the y direction is indicated by the first carriage 41! It is displayed by a scale 53 provided on the top surface of the screen.

As shown in FIG. 17, the above-mentioned pointers 51 and 52
4.55, and is provided on a wire 57 that is suspended via a spring 56. The pulley 55 is connected to the motor 5
The distance between the hands 51 and 52 can be changed by rotating the motor 58 according to the paper size and magnification.

Further, the first carriage 411 is moved to a predetermined position (home position according to the magnification) by driving the motor 33 according to the paper size and magnification. Then, when the copy key 30s is pressed, the first
The carriage 411 is first moved toward the second carriage 412, and then the lamp 4 is turned on and moved away from the second carriage 412. When scanning of the original is completed, the lamp 4 is turned off and the first carriage 411
is returned to the home position.

FIG. 18 shows the overall control circuit, showing the main processor group 71 and the first . Second sub-processor group 72.
It is mainly composed of 73. Main processor group 7 above
Reference numeral 1 denotes a high-voltage transformer 76 that detects input from an input device 75 such as an operation panel 30 and various switches and sensors, such as the cassette size detection switches 601 and 602, and drives the various chargers; The blade solenoid 27a1 of the cleaner 27 controls the heater 23a of the pair of constant inspection rollers 23, the exposure lamp 4, and each of the motors 31 to 40.58 to perform the copying operation, and also controls the spot light source 131 and the pulse motor. 135, illumination lamp 139, memory 140,
It controls the erasing array 150, array drive unit 160, etc. to erase unnecessary portions of the document. In addition, a spot light source 131, a pulse motor 135, and an illumination lamp 139
, erase array 150, array driver 160, memory 14
0 will be described later.

Among the above motors 31 to 40.58, motor 35.37
．． A toner motor 77 that supplies toner to the developing unit 40 and the developing device 12 is controlled by the main processor group 71 via a motor driver 78.
are processed by the first sub-processor group 72 via the pulse motor driver 79, and the motors 36, 39, .
38.58 is the second motor via the pulse motor driver 80.
It is controlled by a sub-processor group 73. Further, the exposure lamp 4 is controlled by the main processor group 71 via the lamp regulator 81, and the heater 23a is controlled by the main processor group 71 via the heater control section 82. and,
Commands to drive and stop each motor are sent from the main processor group 71 to the first and second sub-processor groups 72 and 73.
1st. A status signal indicating the drive/stop state of each motor is sent from the second sub-processor group 72, 73 to the main processor group 71. In addition, the first sub-processor group 7
2 receives position information from a position sensor 83 that detects the initial positions of the motors 31 to 34.

FIG. 19 shows an example of the configuration of the main processor group 71. That is, 91 is a one-chip microcomputer (hereinafter abbreviated as microcomputer), and input/output board 9
2, key human power detection and various display controls on an operation panel (not shown) are performed. Further, the microcomputer 91 is expanded by input/output ports 93-96. and,
A high voltage transformer 76, a motor driver 78, a lamp regulator 81, and other outputs are connected to the input/output boat 93. A size switch for detecting paper size and other inputs are connected to the input/output boat 94. is connected to the photographing condition setting switch and other inputs. Note that the input/output port 96 is an option.

FIG. 20 shows an example of the configuration of the first sub-processor group 72. That is, 101 is a microcomputer, which is connected to the main processor group 71.

102 is a programmable interval timer for controlling the phase switching interval time of the pulse motor;
By setting a set value from 1, a count is performed based on the set value, and when the count is out, an end pulse is output to the interrupt line of the microcomputer 101. Timer 10 above
2, a reference clock pulse is input. Furthermore, the microcomputer 101 receives position information from the position sensor 83 and is connected to input/output boats 103 and 104. The input/output boat 104 is connected to the motors 31 to 31 through the seven pulse motor drivers.
34.135 are connected.

The human output boat 103 is used, for example, when outputting status signals of each pulse motor to the main processor group 71.

FIG. 21 shows the configuration of the second sub-processor group 73. That is, 111 is a microcomputer, which is connected to the main processor group 71. Numeral 112 is a programmable interval timer for controlling the phase switching interval time of the pulse motor, and when a set value is set by the microcomputer 111, it counts based on the set value, and outputs an end pulse when the count is out. This termination pulse is latched by the latch circuit 113, and its output is
11 interrupt lines and I/O port input lines. Further, an input/output boat 114 is connected to the microcomputer 111, and a motor 36, 38, 39 is connected to this input/output boat 114 via the pulse motor driver 80.
．． 58 are connected.

Figure 22 shows the control circuit of the pulse motor.
The input/output boat 121 (corresponding to the input/output boats 104 and 114 in FIGS. 20 and 21) has a pulse motor driver 1.
22 (corresponding to the pulse motor driver 79.80 in FIG. 18) is connected to the pulse motor driver 122.
．． 38.39) are connected to each other.

FIG. 23 shows a method for controlling the speed of a pulse motor. FIG. 3(a) shows the speed curve of the pulse motor, and FIG. 1(b) shows the phase switching interval.

As is clear from this figure, the phase switching interval is good at first;
They gradually shorten, then become evenly spaced, then gradually lengthen again, and then stop. In other words, this indicates the through-up and through-down of the pulse motor, starting from the self-starting region, being used in the high-speed region, and finally falling down. Note that tl, t2, . . . tx indicate the time of the phase switching interval.

Next, the document image erasing means, which is the gist of the present invention, will be explained.

1(a) and (b), the first carriage 411 is provided with a guide shaft 130 along the lamp 4 in a portion where the light of the lamp 4 is blocked, and this kite shaft 130 is provided with a guide shaft 130 for erasing the original. Spot light source 1 as a means of indicating a range
31 is movably provided. This spot light source 1
As shown in FIG. 3(b), 31 includes a light emitting element 132, such as a light emitting diode or a lamp, and a lens 133, which are provided opposite to the document table 2.
The light generated by the lens 133 is irradiated onto the document table 2 as a spot light having a diameter d. This spot light has a brightness that allows it to pass through the original IG, which is set on the document table 2 and is, for example, as thick as a postcard. Further, the spot light source 131 is connected to a timing belt (toothed belt) 134 disposed along the guide shaft 130.
is connected to. The timing belt 134 is connected to a pulley 136 provided on the rotating shaft of the pulse motor 135 and a driven pulley 137.

Therefore, by rotating the pulse motor 135, the spot light source 131 is moved in a direction perpendicular to the scanning direction of the first carriage 411.

Further, a position sensor 138 consisting of a microswitch for detecting the initial position of the spot light source 131 is provided in the first carriage 411 located at the end of the guide shaft 130 on the pulse motor 135 side.

For example, spot light? When 1i131 is moved, first, the spot light m131 comes into contact with the position sensor 138, and the initial position is detected.

Further, as described above, an illumination lamp 13 is provided on the back surface of the document table 2 and in a portion corresponding to the fixed scales 2s and 22.
9 is provided, and this illumination lamp 139 is turned on in response to the operation of the operation keys 308 to 30d, and is turned off in response to the operation of the position designation keys 30f and 30g. This illumination lamp 139 is designed to generate light of a different color from the spot light, so that the spot light can be easily recognized.

Next, with reference to FIG. 2, a method of specifying the erasing range of the document using the spot light source 131 will be described.

In this embodiment, the original is set face down along the fixed scale 21 of the original table 2. In the main processor group 71, first, in step S1, the operation key 3 is pressed.
The operations of 08 to 30d are determined, and as a result, operation key 3
If it is determined that any one of 08 to 30d has been operated, the illumination lamp 139 is turned on in step S2, and the entire surface of the document table 2 is illuminated. In this state, in step S3, the spot light source 131 is moved in a lit state in response to the operation of the operation keys 308 to 30d. Here, when the operation keys 30b and 30d are pressed, for example, the motor 33 is driven, and the first carriage 411 and the spot light source 131 are moved in the scanning direction (arrow y shown in FIG. 3).
direction). Further, when the operation keys 3Qa, 30c are pressed, the motor 135 is driven, and the spot light source 1
31 is moved in a direction perpendicular to the scanning direction (direction of arrow X shown in FIG. 3). At this time, the light from the illumination lamp 139 passes through the original G so that the original image can be seen, and the spot light can also be seen through the original G. The operator presses the operation key 30 while visually viewing the original image transmitted through the original G and the spot light.
a to 30d, for example, the document G shown in FIG. 4(a).
With the spotlight moved to the upper point Si, the position designation key 300 is pressed. Then, the coordinate position specified by this Sl is stored in the main processor group 71 shown in FIG. Similarly, when the position designation key 308 is pressed with the spotlight moved to 82 points on the source 11G, the positions of the 82 points are stored in the main processor group 71. The position of this spot light can be detected, for example, by counting the number of drive pulses of the pulse motor 33.135. After this,
In step S4, if it is determined that the erasure range designation key 30f has been pressed, the S
A rectangular area (indicated by diagonal lines) having diagonal points t and 82 points is designated as the erasure range. Further, in step S5, with the 83rd and 84th points of the original IG specified as shown in FIG.
If it is determined that has been pressed, the area other than the square with the diagonal points 83 and 84 is designated as the erasing range.

In this way, when the erasure range specifying keys 30f, 30Q are pressed, the illumination lamp 139 is turned off in step S6. After that, in step S7, the main processor group 71 performs calculations based on the positions of the specified two points and the copying magnification, and the memory 140 stores a high level signal ``'1'' in the erasing area, and a high level signal ``'1'' in the other areas. A low level signal II O11 is stored in the section .That is, this memory 140 is constituted by a RAM whose capacity in each column direction is approximately equal to the moving distance of the spot light source 131 in the X direction divided by the position resolution in the y force direction. With the data supplied from the main processor group 71, the
), as shown in Fig. 5(a), and in the case of Fig. 4(b), as shown in Fig. 5(b),
High level signals are stored in addresses corresponding to the shaded areas, and low level signals are stored in other addresses. In a state where the erase data is stored in the memory 140 corresponding to the erase range of the specified document,
The operation of specifying the erasure range is completed.

On the other hand, as shown in FIG. 6, an eraser is provided between, for example, the charger 11 and the exposure section Ph of the photoreceptor drum 10.

Eraser arrays 150 as stages are provided in close proximity. As shown in FIGS. 7 and 8, this erasing array 150 includes a plurality of light-shielding cells 151 arranged in a direction perpendicular to the rotational direction of the photoreceptor drum 10, and these light-shielding cells 15
1, as shown in FIGS. 9(a) and 9(b), respectively.
A light emitting element 152 made of, for example, a light emitting diode is provided.

Furthermore, a lens 153 is provided in the opening of each cell 151 facing the photoreceptor drum 10 to focus the light from the light emitting element 152 onto the surface of the photoreceptor drum 10 . The number of light emitting elements arranged in this erasing array 150 matches, for example, the capacity of the memory 140 in the column direction. Here, if the distance between the light emitting elements 152 is P and the number is N, the total length of the erasing array 150 is Q=NXP.

The erase array 150 is driven by the array driver 160 described above. As shown in FIG. 10, this array driving section 160 includes a shift register 161 having the same number of bits as the number of pits in the column direction of the memory 140, a shift register 162 that holds the contents of this shift register 161, and a shift register 162 that holds the contents of this shift register 161. The switch circuit 164 includes a plurality of switch elements 163 that are controlled on and off by each output signal of the store register 162, and the movable contact pieces 163a of these switch elements 163 are grounded.
The fixed contacts 163b are connected to each cathode of the light emitting elements 152 constituting the erasing array 150, respectively.

The anode of each of these light emitting elements 152 is a current limiting resistor R
are connected to the power supply IVcc through the respective terminals.

After specifying the erase range of the original as described above, when the original cover 11 is closed with the original left as is and the copy key 301 is pressed, the first carriage 41! As the photosensitive drum 10 is operated, data for one column is sequentially read out from the memory 140 in the row direction (as shown in FIG. 5). This read data D1 is the clock signal C.
LK causes the shift register 16 of the array driver 160 to
Transferred to 1. After one column of data has been transferred to the shift register 161, when the charged portion of the photosensitive drum 10 reaches the erase array 150, the main processor 71 outputs a latch signal LTH, and the shift register 161 outputs a latch signal LTH. The signal is supplied to register 162. That is, since the erasing array 150 is arranged between the charger 11 and the exposure section ph, one row of data outputted from the memory 140 has, for example, an angle of θ! between the erasing array 150 and the exposure section ph! If the photoreceptor drum 10 is rotating at each speed, the store register 162 is loaded before θ1/ω.
The output timing of the latch signal LTH is controlled so that the latch signal LTH is supplied to the latch signal LTH.

Each switch element 163 of the switch circuit 164 is controlled by the output signal of the store register 162. That is, when the output level of the store register 162 is high level, it is turned on, and when it is low level, it is turned off. As a result, the light emitting elements 152 connected to each switch element 163 are turned on when the switch element 162 is on, and are turned off when the switch element 162 is off. Therefore, among the charged parts of the photoreceptor drum 10, the part where the light emitting element 152 is turned on is charge-free, and even if the charge-free part is exposed afterwards, no electrostatic latent image is formed, and the original image is not erased. It means that it was done. Thereafter, the data in the memory 140 is read one column at a time in the same manner, and the image is erased.

According to the above embodiment, unnecessary portions of a document can be designated and erased, which is convenient for making m collections of copied images. Moreover, an illumination lamp 13 is provided on the back side of the document table 2.
9 is provided, and this illumination lamp 139 is turned on when an erasing range of the original is specified, so that the original image can be visually viewed while the original is set face down. Therefore, it is possible to specify the erasing range and copying operations while the original is turned over, so there is no need to re-set the original to specify the erasing range and copy, as in the past. It is possible to prevent copying errors such as misalignment of ranges.

Furthermore, since the illumination lamp 139 has a different emission color from the spotlight, the spotlight has the advantage of being easily recognizable even when the illumination lamp 139 is turned on.

Note that this invention is not limited to the above embodiments,
For example, the arrangement position of the erasing array 150 is not limited to that shown in FIG. 6, but as shown in FIG. It is also possible to configure the data to be erased.

It goes without saying that various other modifications can be made without changing the essential parts of the present invention.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to specify and erase a desired range of a document without changing the setting position of the document, and to avoid misregistration, etc. in the formed image. Accordingly, it is possible to provide an image forming apparatus that can improve the quality of formed images without causing problems.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of an image forming apparatus according to the present invention; FIG. 1(a) is a perspective view of a main part showing a spot light source, and FIG. 2 is a side sectional view, FIG. 2 is a diagram shown to explain the operation of specifying the erase range, FIGS. 3 and 4 are plan views each shown to explain the operation of the spot light source, and FIG. 5 is the contents of the memory. FIG. 6 is a side cross-sectional view of the main part showing the arrangement of the erasing array, and FIGS. 7 and 8 show the relationship between the erasing array and the photosensitive drum, respectively. is a perspective view showing only the main parts, FIG. 8 is a front view showing only the main parts, and FIG. 9 shows the configuration of the erasing array.
a) is a side sectional view, FIG. 10(b) is a partially cutaway front view, FIG.
Figure 1 is a side sectional view of the main parts showing another arrangement example of the erase array;
12 and 13 show the configuration of the image forming apparatus, respectively. FIG. 12 is an external perspective view, FIG. 13 is a side sectional view, and FIG. 14 is a plan view showing the configuration of the operation panel. 1
Fig. 5 is a perspective view showing the structure of the drive section, Fig. 16 is a perspective view schematically showing the drive mechanism of the optical system, Fig. 17 is a perspective view schematically showing the drive mechanism of the pointer, and the 18th factor is the overall view. FIG. 19 is a configuration diagram showing the main processor group, FIG. 20 is a configuration diagram of the first sub-processor group, and FIG.
This figure is a block diagram of the second sub-processor group, FIG. 22 is a schematic block diagram showing a pulse motor control circuit, and FIG. 23 is a diagram for explaining a pulse motor speed control method. DESCRIPTION OF SYMBOLS 1...Main body, 2...Document stand, 10...Photoconductor drum, 30...Operation panel, 30a-30d...Operation keys, 30e...Position specification key, 71...Main Processor group, 131...Suboc I/light source, 132...
...Light emitting element, 133...Lens, 135...
Pulse motor, 139...Illumination lamp, 140...
Memory, 150... Erasing array, 152... Light emitting element, 153... Lens, 160... Array drive unit,
S...Spot light, Sa...Auxiliary light, P...Paper, Ph...Exposure section. Applicant's agent Patent attorney Takehiko Suzue Figure 2 Figure 4 (a) Figure 4 (b) (a) (b) Figure 5 Figure 61i! ! I Figure 11 (a) (b) Figure 10 Figure 12 Figure 21 Figure 22

Claims (2)

[Claims] (1) In an image forming apparatus comprising a scanning means for optically scanning a document placed on a document table, and a transfer means for transferring an optical image obtained by the scanning means to a transfer material, the scanning means an indicating means provided on the back side of the document table for instructing a predetermined range of the document using a spotlight; an erasing means for erasing an image within or outside the specified range during image formation; and an instruction means provided on the back side of the document table. 1. An image forming apparatus comprising: illumination means for illuminating a document table during operation. (2) The image forming apparatus according to claim 1, wherein the illumination means generates light of a different color from the spot light.