JP2934708B2 - Camera warning device - Google Patents

Description

The present invention relates to a camera warning device.

B. Prior Art Conventionally, there has been known a warning device which issues a warning when a camera is operated under set photographing conditions and an exposure result is expected to be unsatisfactory, and prompts a photographer to take preventive measures.

For example, in the field of automatic exposure, when an automatically set shutter speed reaches a predetermined second or less, a warning is issued and attention is paid to so-called camera shake. This allows the photographer to take precautionary measures such as increasing the shutter speed or using a tripod to prevent blurring.

The same applies to other fields, for example, an autofocus device. When the operation of the automatic distance measurement circuit is incomplete because the subject is a specific condition, an alarm to that effect is issued.

On the other hand, various types of warnings have been devised, including aggressive warning means such as a buzzer sound and blinking of LEDs, etc., which use a part of the display members provided in the viewfinder. Was.

C. Problems to be Solved by the Invention In the conventional warning device as described above, since the type of warning is one irrespective of the difference between photographers and the photographing environment, photographing is performed without noticing the warning. Had the problem that

This may be due to the photographer's inattentiveness, the lack of attention due to the subject's attention, or the inability to hear the buzzer due to excessive environmental noise, or the LED being too bright to blink. And invisible.

A technical object of the present invention is to prevent photographing from being performed ignoring an alarm.

D. Means for Solving the Problem The present invention will be described with reference to FIG. 1 which is a claim correspondence diagram. The present invention determines whether or not a photographing condition causing an exposure result is a photographing condition that gives a warning. Means 101;
A warning unit 102 for issuing a warning to the photographer based on the determination result by the determination unit 101, a detection unit 103 for detecting that shooting has been performed regardless of the warning, and the number of detections by the detection unit 103 has reached a predetermined number. In some cases, the above-described technical problem is solved by providing a control unit 104 that controls the warning unit 102 so that the next warning by the warning unit 102 is changed to a warning having a higher warning level than the previous warning.

A first counting means 201 for counting the number of times the influence has been performed irrespective of the warning; a second counting means 202 for counting the number of times of photographing without issuing a warning; and a first and a second counting means. Control means for comparing the count values of the means 201 and 202, and controlling the warning means 102 so that the next warning by the warning means 102 is a warning having a higher warning level than the warning when the frequency of shooting is high regardless of the warning. 203 may be provided.

E. Function If the shooting is performed ignoring the warning, the next time the warning will be higher than the previous time. In this case, if the warning is ignored even once, the warning level is changed to a higher warning level, or the warning level is raised for the first time when the warning is ignored two or more times and the shooting is performed. May be. Further, the frequency of the number of times of ignoring the warning and the frequency of the number of times of photographic without warning are compared, and the higher the frequency of the former shooting, the higher the degree of warning.

F. Embodiment -First Embodiment An embodiment in which the present invention is applied to a camera shake warning device will be described with reference to FIGS.

In FIG. 2, reference numeral 10 denotes a control circuit including a CPU 10A and the like, and an operation signal is input from an operation signal generator 11 in conjunction with a release operation. Further, a signal measured by the photodiode 12 is input as a photometric output BV via an amplifier 13, and film sensitivity information SV is input from a film cartridge 14. The control circuit 10 is further connected to a magnet 15 for driving and controlling a shutter, a magnet 16 for controlling an aperture, and a display device 17 for displaying various kinds of information in a finder or the like. A sequence system 18 for preparing for the next shooting is connected. Reference numeral 19 denotes an alarm buzzer, and reference numeral 20 denotes a drive circuit thereof. The alarm buzzer 19 sounds when the CPU 10A determines that the shutter speed is lower than a predetermined camera shake limit (for example, 1/60 second) as described later. Here, the driving circuit 20
The alarm buzzer 19 is driven by changing the cycle of the sound according to the alarm control signal from the CPU 10A.

FIG. 3 shows the details of the drive circuit 20. The first oscillating unit 201 has a variable oscillation frequency, and the second oscillating unit oscillates a drive signal having a frequency equal to the natural frequency of the alarm buzzer 19.
202. The oscillating unit 201 includes a NOR gate G1, an inverter G2, resistors R1 to R3, a capacitor C1, and an analog switch G5.The NOR gate G1 and the analog switch G5 are formed as CMOS transistors in the CPU 10A, respectively. An alarm control signal is input from the switches SW1 and SW2. The second oscillating unit 202 includes a NOR gate G3, an inverter G4, resistors R4 to R6, a capacitor C2, and a coil L1.
And a transistor Q1.

As shown, when a high-level alarm control signal is input from the control circuit 10 to the NOR gate G1 and a low-level alarm control signal is input to the analog switch G5, the first oscillation unit 201 stops oscillating and the analog switch 5 is opened, Inverter
The output of G2 becomes high level, and the second oscillator 202 also stops oscillating. Therefore, the alarm buzzer 19 does not sound.
When the switch SW1 is inverted and a low level signal is input from the control circuit 10 to the NOR gate G1, the first oscillating unit 201 starts oscillating. The oscillation frequency is determined by the resistor R3 and capacitor C
1, determined by the threshold of each gate G1, G2, for example, 2 Hz. Note that the resistor R1 is a protection circuit for the gate input and does not affect the oscillation frequency. Since the analog switch G5 is in the open state, the resistor R2 does not affect the oscillation frequency.

The 2-hertz oscillation output from the inverter G2 is input to the gate G3 of the second oscillation unit 202, and the oscillation unit 202 oscillates at a frequency determined by the resistor R5, the capacitor C2, and the like while this input is at a low level. . In this case, the resistor R4 does not affect the oscillation frequency. Assuming that the second oscillation frequency is 4K hertz, the transistor Q1 is driven at 4K hertz every 0.5 seconds. Here, 4K Hertz matches the natural frequency of alarm buzzer 19. FIG. 4 schematically shows the driving frequency of the buzzer 19, wherein F1 in FIG.
Corresponds to 2 hertz.

On the other hand, if the switch SW2 is switched to the power supply side and a high-level signal is output while the low-level signal is being output from the switch SW1, the analog switch G5 will short-circuit and
R2 is connected in parallel with the resistor R3, and the combined resistance value is smaller than the resistor R3. Therefore, the oscillation frequency of the first oscillation unit 201 increases, for example, to 8 Hz. Since this 8 Hz oscillation signal is input to the gate G3 of the second oscillation section 202, the transistor Q1 is driven at 4K Hz every 0.125 seconds. F3 shown in FIG. 4 (b) represents 8 Hz.

Accordingly, the buzzer drive circuit 20 stops the alarm buzzer 19, generates a relatively slow beep, as shown in FIG. 4 (a), and generates a low-warning warning sound in response to the warning control signal from the CPU 10A, and FIG. 4 (b). , Two types of warning sounds, which are relatively tense and have a high warning level, are emitted.

Next, a description will be given, based on the flowcharts of FIG. 5 to FIG. 7, of a process of determining a camera shake and switching an alarm control signal by the CPU 10A.

FIG. 5 shows a main routine which is repeatedly executed while power is supplied to the camera. When this routine is started by supplying power, the CPU 10A is first initialized in step S1. At this time, 2 is set in a register WL described later. In step S2, the photometric output BV and the film sensitivity information SV are fetched. In step S3, shutter speed information TV and aperture information AV to be controlled are calculated from the BV and SV. In step S4, the determination of the camera shake limit and the necessity of a warning are determined from the shutter speed information TV.

FIG. 6 shows the details of step S4. In step S41, it is determined whether or not the shutter speed information TV is slower than the camera shake limit value TVL. When the result is affirmative, in step S42, a W flag indicating the necessity of warning is set. Set and go to step S43,
The switches SW1 and SW2 of the control circuit 10 are turned on / off according to the contents of the register WL indicating the degree of warning. In this embodiment, when WL is 1, the buzzer 19 is driven at the sounding period of FIG. 4B with a high warning degree, and when WL is 2, the sounding period of FIG. To drive buzzer 19 with WL = 1
To set the switches to SW1 = L, SW2 = L, WL = 2 and to set the switches to SW1 = L and SW2 = H. If step S41 is negative, the W flag is reset in step S44, and the drive of the buzzer 19 is stopped by setting the switch SW1 = H in step S45. At this time, after step S43 or step S45 in which the switch SW2 is set to L, step S5 in FIG.
Proceed to.

In step S5, it is determined whether or not a release has been performed from the operation signal. If the result is negative, the process returns to step S2. If the result is affirmative, the process proceeds to step S6, where the shutter speed information TV and the aperture information are determined.
Store the AV in the memory. Thereafter, the process proceeds to step S7, where the warning level is set in the register WL.

 FIG. 7 shows the details of step S7.

In a step S71, it is determined whether or not the W flag is set.
Is set to 1, and if the W flag is not set, 2 is set to the register WL in step S74. Thereafter, the W flag is reset in step S73, and the process proceeds to step S73 in FIG.
Return to 8.

In step S8, a sequence processing routine such as an exposure operation and the subsequent film winding is executed, and when these are completed, the process returns to step S2.

According to the above processing procedure, the following warning operation is performed.

Since the register WL is set to 2 after the power is turned on, if the shutter speed is lower than 1/60 at the time of the first photographing operation, the alarm buzzer 19 with the low alarm level sounding cycle shown in FIG. Sounds. If photographing is performed irrespective of this warning sound, 1 indicating a high warning level is set in the register WL in step S72 of FIG. Therefore, when the shutter speed is again lower than 1/60 at the time of the next shooting operation, the alarm buzzer 17 sounds at the sounding cycle shown in FIG. Further, if the shutter speed becomes faster than 1/60 during the subsequent photographing, the step shown in FIG.
The W flag is reset in S44, and the register WL is set to 2 having a low warning level in step S73 in FIG. 7 by the subsequent release operation. Therefore, the warning sound when the shutter speed becomes slower than 1/60 at the time of
The sound has a low warning level as shown in FIG.

The buzzer 19 activated in step S43 in FIG. 6 is stopped in step S45 after photographing.

FIG. 8 shows a second embodiment of the switching process of the alarm control signal, and is a flowchart corresponding to FIG.

In step S701, it is determined whether the W flag is set. If the result is affirmative, 1 is added to the count value nW in step S702, and in step S703, the new nW is multiplied by the coefficient α and stored as NW. On the other hand, if the W flag has not been set, 1 is added to the count value nN in step S704, and the new nN is stored as NN in step S705. Next, in step S706, it is determined whether or not NW is greater than or equal to NN. If negative, WL is set to 2 in step S707, and if positive, the process proceeds to step S708 to set WL to 1. Thereafter, in step S709, the W flag is reset, and the process returns to step S8 in FIG.

According to the second embodiment, the number of times the shooting is performed ignoring the warning and the number of times the shooting is performed without the warning are counted. If the former is large, the step S708 in FIG. 8 is performed. , A register WL indicating the degree of warning is set to 1. As a result, the shutter speed for the next shooting is 1/60
If it is later, the buzzer will sound at step S4 in FIG.
19 sounds in a tense ringing cycle with a higher warning level. If the number of times of shooting without warning is larger than the number of times of shooting in spite of the warning, WL is set to 2 in step S707 in FIG. 8, so that the shutter speed is less than 1/60 in the next shooting. The warning sound when it is late is a slow sound.

-Third Embodiment-In this embodiment, the shutter speed is classified into three types of H, M, and L as shown in the following table, the number of times of photographing is counted for each shutter speed, and the frequency of each shutter speed is determined. The warning sound is changed in three stages based on the above. Therefore, any one of 1 to 3 is set in the register WL indicating the degree of warning, and the driving circuit is provided so that the warning buzzer 19 sounds at three kinds of sounding cycles.
Make up 20. Note that the range of H is a shutter speed at which there is no risk of camera shake, the range of M is a shutter speed at which there is a risk of camera shake but can be prevented if the photographer pays attention, and L is a shutter speed at which camera shake cannot be prevented without considerable care. .

FIG. 9 is a flowchart corresponding to FIG. 7, showing the procedure for switching the alarm control signal in the third embodiment.

In step S711, the shutter speed information TV is read. In step S712, it is determined whether or not the information TV is equal to a predetermined reference value H. If affirmative, the process proceeds to step S713, where 1 is added to the count value nH, and stored as NH in step S714. If step S712 is negative, it is determined in step S718 whether or not the shutter speed information TV is equal to the reference value M (<H). If affirmative, the process proceeds to step S719, where the count value
In step S720, 1 is added to nM, and the new count value nM is multiplied by the coefficient α and stored as NM. Further, step S7
If the result in 18 is negative, the process proceeds to step S721, where 1 is added to the count value nL, and in step S722, the new count value nL is multiplied by the coefficient β and stored as NL. Then, in step S715
It is determined whether NH is equal to or greater than NM, and if affirmative, step S716 is performed.
To determine whether NH is greater than or equal to NL. If this step S716 is affirmed, 3 is set to WL in step S717. If step S715 is denied, it is determined in step S723 whether NM is greater than or equal to NL. If affirmed, WL is set to 2; if denied, WL is set to 1 in step S725. On the other hand, when step S716 is denied, the process proceeds to step S725, and 1 is set to WL.

According to this embodiment, if the number of times of shooting at a shutter speed of 1/125 or more is large, 3 is set to WL, and 1/60 is set.
When a shutter speed slower than that is set, the alarm buzzer 19 sounds with a sound with the lowest warning level. When the shooting frequency in the range of 1/60 to 1/8 is high, WL is set to 2 and the alarm buzzer 19 also sounds with a sound indicating a moderate warning, and the shooting frequency less than 1/4 second When the number increases, 1 is set to WL, and the alarm buzzer 19 sounds with the sound with the highest warning level under the same condition.

In the above, the warning level is changed by changing the ringing cycle of the buzzer 19, but the sound intensity is changed, or the frequency of the buzzer sound itself is changed to change the warning level with the timbre. Is also good. Further, the warning level may be changed by a combination of the buzzer sound and the light. Further, the warning may be given only by light, and in that case, the warning level can be changed in various forms like the sound.

In the above, the warning regarding the shutter speed has been described, but a warning regarding other shooting conditions may be used.

G. Effects of the Invention According to the present invention, if shooting is performed once or multiple times ignoring warnings on various shooting conditions such as shutter speed, the next time, a warning with a higher warning level than the previous time, or a warning is ignored Since the number of times of shooting is compared with the number of times of shooting without warning, the warning level is increased when the former shooting frequency is high, so that a warning about the shutter speed thereafter can be reliably known to the photographer.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to claims. 2 to 7 illustrate the first embodiment, and FIG.
FIG. 3 is a block diagram showing the overall configuration, FIG. 3 is a detailed circuit diagram of the buzzer drive circuit, FIG. 4 is a diagram for explaining the buzzer sounding cycle, and FIGS. 5 to 7 change the warning and the degree of warning. It is a flowchart which shows a procedure. FIG. 8 and FIG. 9 are flowcharts corresponding to FIG. 5 showing the second and third embodiments. 10: control circuit, 10A: CPU 19: alarm buzzer, 20: buzzer drive circuit 101: determination means, 102: warning means 103: detection means, 104: control means 201: first counting means 202: second counting means , 203: control means

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Masaaki Yanagisawa 1-6-3 Nishioi, Shinagawa-ku, Tokyo Inside Nikon Oi Works Co., Ltd. (72) Inventor Yoshio Matsuzawa 1-6-3 Nishioi, Shinagawa-ku, Tokyo (56) References JP-A-60-26939 (JP, A) JP-A-62-298873 (JP, A) JP-A-62-223739 (JP, A) 49536 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G03B 17/18-17/20

Claims (2)

(57) [Claims] A determination unit configured to determine whether a shooting condition that is a factor of an exposure result is a shooting condition that issues a warning; and a warning unit that issues a warning to a photographer based on a determination result by the determination unit. Detecting means for detecting that the influence has been performed irrespective of the warning; and when the number of times of the detection by the detecting means has reached a predetermined number, the next warning by the warning means is more warning than the previous warning. Control means for controlling the warning means so as to change the warning to a more frequent warning. 2. A determining means for determining whether or not a photographing condition which is a factor of an exposure result is a photographing condition for issuing a warning, and a warning means for issuing a warning to a photographer based on a result of the determination by the determining means. A first counting unit that counts the number of times shooting has been performed irrespective of the warning; a second counting unit that counts the number of shootings without issuing the warning; and the first and second counting. Comparing the count values of the means, and when the frequency of photographing is high irrespective of the warning, the warning means is controlled so that the next warning by the warning means is a warning with a higher warning level than the previous warning. A warning device for a camera, comprising: a control unit.