JPS6258489B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photographing device equipped with an erroneous operation warning device when performing flash photography using a flash device having an automatic light control function and a camera having an automatic exposure function.

In general, conventional flash devices are often configured to always emit a constant amount of light (full flash).
When performing flash photography using such a flash device, the photographer must set the aperture of the camera to an aperture value that corresponds to the subject distance, which is inconvenient.

For this reason, in recent years, in addition to having the function of emitting a constant amount of light as described above, the light reflected from the subject is received by a photoelectric element, and when the reflected light reaches a predetermined value, the discharge tube stops emitting light. A so-called auto-adjustable flash device has been proposed and put into practical use, which has the function of allowing flash photography with proper exposure without changing the aperture value of the camera according to the subject distance. It's coming. On the other hand, in recent years, in the case of natural light photography, one piece of shooting information,
For example, when the photographer sets shutter speed information, the camera automatically determines other shooting information, such as aperture value information, to achieve the appropriate exposure. Adjustable exposure cameras are widely used. Each of these has advantages and can simplify photographing.

By the way, when performing flash photography using such an automatic flash device and an automatic exposure adjustment camera, if the functions of the flash device and camera are not properly combined, there is a risk that the exposure will be incorrect. There is. That is, if the flash device is set to automatic flash mode, you only need to set the camera's aperture to a predetermined aperture value for a predetermined shutter speed. However, if the camera is set to AE mode, the camera itself can set the specified aperture value based on the signal from the flash device, and flash photography with proper exposure is possible. If the flash device is in manual mode, that is, it fires at full capacity, the aperture of the camera must be changed according to the distance to the subject, so the photographer must set the camera to manual mode and set the aperture. There is a need to. In detail, when the flash device is set to manual mode, the camera is set to AE mode.
If you take flash photography with this mode set, the camera will not be able to set the aperture value according to the distance to the subject, resulting in inappropriate exposure. Therefore, when flash photography is attempted with such settings, it is necessary to notify the photographer that the settings are incorrect.

The present invention has been made in view of the above-mentioned matters, and the flash device is set to full flash mode and the camera is
It is an object of the present invention to provide a photographing device that displays a warning when the AE mode is set. In the present invention, when the flash device is in automatic mode,
The aperture value signal from the information signal forming circuit that forms the aperture value signal for transmitting the aperture value for the flash to the camera is set as a specific value when the flash device enters the full flash mode, and is sent to the camera as the specific value. The device is designed to notify the user that the flash device is in full flash mode. By doing so, in the present invention, when transmitting a signal indicating that the flash device has reached full emission to the camera, it is possible to transmit it via the aperture signal terminal that is normally transmitted to the camera, and the camera is connected to the flash device. This achieves the above objectives without increasing the number of terminals.

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

FIG. 1 shows an embodiment of an automatic light adjustment type flash device related to a camera system to which the present invention is applied, in which 1 is a power source battery, and 3 is a conventional known flash device connected to the battery via a normally open type power switch 5. 7 is a main capacitor, 9 and 11 are resistors forming a voltage dividing circuit, and the voltage dividing circuit is connected in parallel to the main capacitor. Further, a capacitor 13 is connected in parallel to a resistor 11 forming a voltage dividing circuit. 15
is a pnp transistor connected to the resistor 11, and its base is connected to ground through the resistor 17 and an X contact provided on the camera side. TPB is a test button, 19 and 21 are resistors, 23 is a capacitor for preventing the thyristor 25 from malfunctioning due to noise, and 27 is the thyristor 2
5 and a trigger transformer connected to the trigger capacitor 29, 31 a resistor forming a charging path for the trigger capacitor 29, 33 a discharge tube connected to the main capacitor 7 via a coil 35, 37 a diode, and 39 the discharge tube 33 is the main thyristor connected in series, 41 is connected via the charging resistor 43
A commutation capacitor connected to the output end of the DC-DC converter 3, 45 a sub-thyristor, 47 and 49 resistors, 51 and 53 capacitors, and 55 a resistor 5
A capacitor 61 and 63 are connected to the output end of the DC-DC converter through 7 and 59, and a thyristor and a Zener diode 65 are connected in parallel to the series circuit formed by the resistor 57 and the capacitor 55. , 67 are resistors and capacitors connected in parallel between the gate and cathode of the thyristor 61, 69 is a phototransistor that receives reflected light from an object (not shown), and an integrating capacitor 71 is connected in series to the phototransistor 69. be done. 73 is a correction resistor connected in parallel to the capacitor 71, and 75 is a switching transistor 7.
Resistors 79 and 81 connected to the base of 7 are resistors for transmitting the light emission stop signal to the light emission stop circuit.
3 is a capacitor, 85 and 87 are transistors 77
A resistor and a diode are used to guide the light emission stop signal generated from the monostable multivibrator circuit (hereinafter referred to as oneshot) to be described later.The cathode of the diode 87 is connected to the base of an npn transistor 89 that forms the input terminal of the oneshot. Connected. 89, 91 are known one-shot npn transistors; 93, 95, 97, 99;
101 is a time-regulating capacitor that together with resistor 99 determines the output time width of the one shot. 105 is an npn transistor connected to the output terminal of the one shot via the resistor 103. The collector is connected to the charge completion signal output terminal C1 via a resistor 107. 109 is an npn transistor, and a resistor 111 and a neon tube 113 are connected to its base, and the neon tube 113 is connected to the output end of the main capacitor 7 via a resistor 115.

In addition, 120 and 121 are resistors that bleed the voltage of the constant voltage terminal _C1 , and these resistors 120 and 121
has a high resistance value so that when the transistor 109 is turned on, a current that is negligible compared to the current flowing through the constant voltage terminal _C1 flows through the resistors 120 and 121. 124 is resistor 122 and ASA
125a is an operational amplifier that forms a non-inverting amplifier together with a variable resistor 123 for inputting sensitivity; 125a is a changeover switch that disables the dimming circuit of the flash device and puts it in manual flash mode; and 125b is changeover switch 1.
This is a changeover switch that, in conjunction with 25a, sets the voltage at the A _VEF terminal to zero volts when the flash device is in the manual flash mode. Note that the A _VEF terminal is for outputting a predetermined aperture signal to the camera side in automatic light control mode, and the _C1 terminal is for outputting a charging completion signal to the camera side.

By the way, the operation of such a flash device is as follows. For example, when performing flash photography in automatic light control mode, the power switch 5 is closed in the state shown in FIG. When the voltage level reaches or exceeds the voltage level, the neon tube 113 lights up and both ends of the resistor 111 become high level, so that the base potential of the transistor 109 becomes high level. Therefore, a collector current flows from the power supply through the resistor 107 to the collector of the transistor 109, and a charge completion signal is output from the _C1 terminal. Thereafter, when the front shutter curtain (not shown) reaches the running end by the release of the camera, the transistor 15 is turned on from off in synchronization with it, and the thyristor 25 is turned on in a known manner.
The discharge tube 33 emits light in a known manner, and the subject is illuminated. On the other hand, since the thyristor 61 is also turned on at the same time as the thyristor 25 is turned on, the capacitor 55
The electric charge stored in advance is discharged through the resistor 57, the thyristor 61, and the Zener diode 63, and a driving voltage of a predetermined level regulated by the Zener diode 63 is applied to the light emission stop signal generation circuit. Therefore, the generating circuit starts its operation at the same time as the light is emitted. When the amount of light reflected from the object reaches a predetermined value, the base potential of the transistor 77 drops to a predetermined value, so the transistor 77 is turned from off to on, and a light emission stop signal is generated from the collector of the transistor 77. When the stop signal is generated, the thyristor 45 is turned from off to on, so the thyristor 39 is turned from on to off in a known manner, and the discharge tube 33 stops emitting light, completing flash photography.

Next, FIG. 2 is a perspective view showing a part of the lens unit of the camera related to the camera system. This figure shows a state in which film winding and shutter charging have been completed. 201 is an aperture ring, and this aperture ring 201 is set when performing automatic exposure adjustment photography (automatic aperture adjustment photography).
AE index and aperture index (1.4
-16) are engraved, and a protruding portion 201a and a cam portion 201b are provided. 202 is an index for setting an AE index or an aperture index.
Reference numeral 203 denotes an aperture preset ring, which is biased to rotate clockwise by a strong spring, and is pressed against the protrusion 2 of the aperture ring 201.
It has a protrusion 203b that can be engaged with 01a. Further, the aperture preset ring 203 is provided with an arm 203c, and the aperture preset ring 203 determines the rotation of the bell crank via an aperture drive ring (not shown) using a lever 203d installed therein. The bell crank controls the rotation of an aperture drive ring (not shown) and determines the opening degree of the aperture. Reference numeral 204 denotes a pin implanted in the aperture drive ring, and the end of this pin 204 engages with an automatic aperture lever of an automatic aperture unit (not shown) which is urged to rotate in the counterclockwise direction. 2
01c is an AE/manual switching signal pin, which is connected to the cam portion 201b so that it moves in conjunction with the operation to match the AE index or the aperture index of the aperture ring 201.
is contacted by a spring 222. 221 is a changeover switch, and when the AE index of the aperture ring 201 is set to the index 202, the changeover signal pin 20
It is configured to be turned off via 1c.

205 is a charge member for attracting the armature 206 to the aperture control magnet 223;
The first end is engaged with a step (not shown) of the charge lever 207, and the second end is locked with a hook (not shown) of the release lever. The third end engages with a stop wheel pawl lever 208, which will be described later.

The automatic exposure control unit has a charge lever 2.
There is a charge gear 209 that engages with the charge gear 209, and the sector gear 210 includes a gear 210a that engages with the charge gear 209, a slider 211, and an AE locking plate 21.
2 is fixed, and the sector gear 210 is meshed with speed regulating (speed increasing) gears 213, 214 and a stop wheel 215. Further, a spring 21 is attached to a pin 210b implanted in the sector gear 210.
0c is attached to urge the sector gear 10 to rotate counterclockwise. Note that this spring 210c is set to be weaker than the spring 203a on the lens side. 216 is an AE locking lever that engages with the locking plate 212 of the sector gear 210. Reference numeral 8 denotes a stop wheel pawl lever, which is biased to rotate counterclockwise by a spring 208a.One end has a pawl portion 208b for stopping the rotation of the stop wheel 215, and the other end has a pawl portion 208b for stopping the rotation of the stop wheel 215. It is pivotally connected by a shaft 208c. 218 is a sliding resistance;
By sliding the slider 211 thereon, its resistance value is varied. 219 is an aperture signal lever, one end of which is connected to the arm 2 of the aperture preset ring 203.
03c, and is pivotally connected to a pin 210d implanted in the sector gear 210 at the intermediate portion, and pivotally connected to the support lever 220 at the other end.

Furthermore, FIG. 3 shows an embodiment of such a camera circuit, in which the C ₁ ' terminal and the A _VEF ' terminal are respectively connected to the C ₁ terminal and the A _VEF terminal of the flash device. . In this figure, 30
2 is an operational amplifier connected to the SPC light receiving element 301, and 303 is a compression diode connected to its feedback circuit. Logarithmically compressed information Bv is generated as a voltage at the output of the operational amplifier 302, and is connected to the operational amplifier via a resistor 304. It is input to the inverting input terminal of 307. Further, 308 is a resistor connected to the operational amplifier 307, 305 and 306 are Sv information and Tv
These are variable resistors for setting information, and the operational amplifier 307 calculates (Bv+Sv+Tv) using these, and outputs an aperture value Av value signal in inverse proportion to the voltage. 340 is an operational amplifier 301,
A constant voltage source that applies a constant voltage (V _REF ) to the non-inverting input terminals of 307, 342, and 346, 341 is a resistor, and 345 is a non-inverting input terminal connected to the voltage dividing point between voltage dividing resistors 343 and 344. A constant voltage source 345 is connected to the inverting input terminal of the comparator 345. Further, as described above, C ₁ ' is a terminal for sending a charging completion signal from the flash device shown in the first figure to the camera side, and a current is caused to flow when the flash device is fully charged.
Therefore, the output of the comparator 345 becomes high level when charging of the flash device is completed, and becomes low level when charging is completed.

309 and 310 are analog switches, and the control terminal C of the analog switch 309 is connected to the inverter 33.
9 and the control terminal C of the analog switch 310 is directly connected to the output of the comparator 345. Therefore, analog switch 30
9 is the comparator 3 when the flash device is not fully charged.
The analog switch 310 is turned on when the output of the comparator 345 is at a low level, and the analog switch 310 is turned on when the flash device is fully charged and the output of the comparator 345 is at a high level. Therefore, when charging is completed, the aperture setting value of the flash device is inputted via the A _VEF ' terminal and inputted to the subsequent circuit. Also, when not charging,
That is, in the AE mode, the aforementioned operational amplifier 307
The aperture value calculated in is input to the subsequent circuit.
351 are these analog switches 309, 310
and its inverting input are connected to a comparator whose non-inverting input is connected to the voltage dividing point of the resistor 357 and the variable resistor 350, and the output of this comparator 351 is
Connected to OR gate 352.

The voltage (KV _REF ) applied to the resistor 357 is created based on the voltage (V _REF ) by the operational amplifier 346 and the resistors 347 and 356, and the voltage (KV _REF ) is applied to the resistor 357 .
Higher voltage. Further, the variable resistor 350 is formed by the slider 211 and the sliding resistor 218 shown in the second diagram, and changes the partial pressure value by moving the slider 211. Further, 221 is a changeover switch shown in the second figure, which is switched to the AE mode side in this figure. At this time, when the divided voltage value matches the Av signal value from the analog switch 309 or 310, the transistor 354 is turned off via the OR gate 352 and the resistor 353,
Turn off the aperture control magnet 223. Therefore, the rotation of the aperture preset ring 203 shown in the second figure is stopped at this time. In addition, selector switch 2
21 is ON, that is, when the camera is in manual mode, the inverter 348 and
Transistor 35 is always connected via OR gate 352.
4 is in the ON state, the aperture preset ring 203 is interlocked with the aperture ring 201 by the biasing force of the spring 203a, and the aperture value is manually set.

Furthermore, the outputs (AV signal values) of analog switches 309 and 310 are sent to comparators 318 to 32.
3 is input. These comparators 318~
323 is for determining the level of the AV signal value, and the other input terminal has resistors 311 to 317.
Each dividing point is connected. Note that the resistor 3
11 to 317 are for dividing the voltage (KV _REF ).

_L1 to _L8 are light emitting diodes arranged in the viewfinder of the camera, and in this embodiment, the aperture information is illuminated by the light emitting diodes _L1 to _L8 . In addition, resistors 311 to 317
For example, when the output (AV signal value) from the analog switch 309 or 310 is around F2.8 or a value corresponding to the open side, the outputs of the comparators 318 to 322 are all high. When the AV signal value is around F4, only comparator 318 outputs low level, and when it is F5.6, comparator 318 outputs low level.
Comparator 31 when 18, 319, F8
8~320, comparator 318~ when F11
321, comparator 318-3 when F16
22 is set to a low level. By the way, the light emitting diodes L ₂ to _{L 6} are connected to exclusive OR circuits 327 to 330 as shown in the figure.
and are connected to the comparators 318 to 322 via resistors 330 to 335, so when the AV signal value is at a value corresponding to F2.8, only the light emitting diode _L2 lights up, and when it is F4, no light is emitted. Only diode L ₃ , only light emitting diode L ₄ when f/5.6, light emitting diode only when f/8
Only light emitting diode L ₅ is lit, and when F11 is set, only light emitting diode L ₆ is lit. Also, the AV signal value is F16
When the value corresponding to is reached, the inverter 326
Since the output of is high level, changeover switch 2
21 is off, only light emitting diode L ₇ is lit via AND gate 337 and resistor 338.

323 is a comparator that becomes high level when the AV signal value is output from F16 to the aperture side.
24 is a NAND gate connected to the comparator 323, and 358 is a multivibrator, which causes the NAND gate 324 to output a rectangular waveform when the output of the comparator 323 is at a high level.

Therefore, when the AV signal value is output to the aperture side from F16, the light emitting diode _L7 is displayed blinking. In other words, when the minimum aperture value flashes, an overexposure warning will be displayed. Further, the light emitting diode _L1 is used to light up the "ⓓ" mark in accordance with the output of the comparator 345 during flash photography.

In this case, the aperture setting value from the flash device is A _VEF
The information is input through the terminal and displayed in the same manner as described above. Further, the comparator 345 becomes high level upon completion of charging of the flash device, and lights up the light emitting diode _L1 via the inverters 339, 325 and the resistor 326.

Next, in a camera configured in this way,
The warning operation when the above-mentioned erroneous operation is performed will be explained.

For example, when the flash device shown in the first figure is set to the manual mode, that is, the full flash mode, the changeover switch 125b is turned on in conjunction with the operation of the changeover switch 125a, so the output of the A _VEF terminal is zero volts. becomes. Therefore, when the flash device is fully charged and a current flows through the _C1 terminal and the output of the comparator 345 becomes high level, the light emitting diode _L1 is lit and the "〓" mark is illuminated, allowing flash photography. In addition to displaying that something is true, only the comparator 323 among the comparators 318 to 323 becomes high level. Further, as a result, the output of the inverter 336 becomes high level, and a rectangular wave is output to the output terminal of the NAND gate 324. On the other hand, when the switch 221 is turned off and the camera is set to AE mode, the output of the NAND gate 349 is output to the comparator 34.
Even if the output of 5 becomes high level, it is held at high level, so the light emitting diode _L7 is displayed blinking via AND gate 337. However, when the changeover switch 221 is turned on and the camera is set to manual mode, when the output of the comparator 345 becomes high level due to completion of charging of the flash device, the output of the NAND gate 349 becomes low level, so the AND gate 337 is prohibited and the light emitting diode _L7 is not lit. Further, when the camera is set to the manual mode, the light emitting diode _L8 is turned on by turning on the changeover switch 221 to indicate that the camera is in the manual mode. In other words, when the flash device is set to manual mode and the camera is set to AE mode, it is impossible to obtain proper exposure, so the light emitting diode _L7 flashes a warning and the camera is also set to manual mode. When you are
Proper exposure shooting is possible with all manual operations,
All light-emitting diodes _L2 to _L7 for aperture value display are turned off.

Note that even if the manual mode setting signal for the flash device is sent to the camera from a terminal other than the A _VEF terminal, it is possible to make the aperture display blink or turn it off by installing a simple gate circuit. , such things can also be easily derived from the present invention.

As explained above in detail, the present invention uses signals output when the flash device is set to manual operation and signals output when the camera is set to automatic exposure adjustment. , Since the camera is configured so that warning information is displayed on the display means for displaying shooting information during flash photography, the flash device can be set to the manual operation side and the camera can be set to the automatic exposure adjustment side to perform flash photography. This can be reliably prevented from occurring, and photography will not be taken with inappropriate exposure.

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram showing an embodiment of the circuit of a flash device according to the present invention, FIG. 2 is a perspective view showing a lens unit of a camera according to the present invention, and FIG. 3 includes an erroneous operation warning device of the present invention. FIG. 3 is a wiring diagram showing a circuit of the camera. 125b...Switching switch (for setting flash device mode), 221...Switching switch (for setting camera mode), 324...Nand gate, 336
...Inverter, 337 ...And gate, 34
9... NAND gate, 358... Multivibrator, L ₇ ... Light emitting diode.

Claims (1)

[Scope of Claims] 1 It has a full-flash mode in which full light is emitted, and an automatic mode in which the amount of flash light is automatically adjusted by detecting the amount of light reflected from the subject due to flash light emission, and furthermore, an automatic mode. A flash device equipped with an information signal forming circuit for forming an information signal for determining an aperture value for flash photography, a manual operation mode for manually adjusting the aperture, and a flash device equipped with an information signal forming circuit for forming an information signal for determining an aperture value for flash photography; and an automatic aperture control mode in which the aperture is controlled by an aperture control circuit based on an information signal from the information signal forming circuit for flash photography by setting the output of the information signal forming circuit to the full flash mode. a first signal forming circuit for forming a first signal when the camera is set to an automatic aperture control mode; A photographing device characterized in that it is provided with a display means for displaying a warning in response to the simultaneous occurrence of both the first signal from the first signal forming circuit and the information signal of the specific value from the information signal forming circuit. .