JPS604444B2 - Composite digital electric shutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite digital electric shirt for use in a photographic camera.

Conventionally, in aperture-priority digital cameras commonly used in photo cameras, a good photograph can be taken immediately only when the photographing light that passes through the aperture is the proper light for the film. In other cases, satisfactory photography cannot be achieved with the same aperture.

For example, if the photographing light is extremely bright, you will not be able to take a picture even if you use the maximum distance, while if it is dark, the maximum distance will be cut off, which will easily cause camera shake, making it impossible to take good photographs. Therefore, the photographer adjusts the aperture, points the camera at the subject again, obtains new photographic light information, and re-stores the information in the storage device.

Note that if appropriate photographic light cannot be obtained even after adjusting the aperture once, the same process will be repeated several times. In such a case, in the conventional aperture-priority type digital electric shirtless camera, it is necessary to re-store the photographing light information once stored in the counter each time the aperture is readjusted until an appropriate shutter time is reached. To do this, it is necessary to clear the memory of the counter every time the aperture is adjusted, and also to generate and re-memorize new photographic light information, which requires extremely troublesome steps in photographing. The present invention has been developed to enable immediate shooting by simply correcting the aperture in the above-mentioned cases, without clearing counter memory, generating new shooting light information, or storing it. A composite digital electric shirt is provided by skillfully combining a photoresponsive shirt time restoration device and a fixed shirt shirt time restoration device.

Hereinafter, the present invention will be explained in detail with reference to drawings of embodiments.

FIG. 1 shows an embodiment of the digital electric shirt according to the present invention, in which block G is a circuit constituting a photoresponsive pulse generator, P is a light receiving element that detects light passing through an aperture F, and 1 is a photoresponse timer that outputs a single time signal with different time lengths depending on the detection output of the light receiving element. 2 is a reference pulse generator that generates reference pulses with a constant period;
This output and the output of the timer are input to an AND circuit A.

3 is a photoresponse pulse counter, and 4 is each binary counter as a first reference pulse counter.

The output device of the AND circuit A is connected to the input end of the binary counter 3 via a frequency divider D, which is a so-called ASA converter. In this embodiment, the binary counter 3 is shown to have six counting stages for convenience of explanation, with a lamp L at the counting output end of the first stage and an OR circuit ○, at the counting output terminal of the second to fourth stages. A lamp L2 is connected to the output end of the fifth stage, a lamp L3 is connected to the output end of the fifth stage, and a lamp L4 is connected to the output end of the sixth stage.These lamps constitute a photographing light information display. The output end of the generator 2 is connected to the input side of a regular contact type switch S, which is linked to the shirt release and closed in synchronization with the opening of the shirt release, and the output side of the switch is connected through the inhibit circuit 1. It is connected to the input terminal of the binary counter 4. Reference numeral 5 denotes a matching circuit which is followed by each counting output terminal of the binary counters 3 and 4. It constitutes a device M.

Reference numeral 6 denotes a shirt starter opening circuit connected to the output end of the coincidence circuit 5 via an OR circuit 02, and this circuit 6 includes a thyristor SCR and a shirt starter opening electromagnet L connected as shown.

and a resistor R. Reference numeral 7 denotes a constant time timer that outputs a time signal of a constant length, and the output of this timer and the output of the reference pulse generator 2 are input to an AND circuit A2.

8 is a first auxiliary counter, and 9 is each binary counter as a second reference pulse counter.

The output terminal of the band circuit is connected to the input terminal of the binary counter 8 via the frequency divider D2 for adjusting the number of pulses, and the input terminal of the binary iJ counter 9 is connected via the inhibit circuit 12 to the output terminal of the switch S. connected to the side. 10 is a second matching circuit connected to each counting output terminal of the binary counters 8 and 9, the output terminal of this circuit is connected to one input terminal of the OR circuit 02, and the block L is a slow speed fixed shirt gate. It constitutes a time restoration device.

In the same manner as above, the AND circuit A3, the pulse number adjustment cylinder divider D3, the inhibition circuit 13, the second auxiliary counter 1,
Third reference pulse counter 12 and third matching circuit 1
3 etc. are connected as shown, and the block date constitutes a high speed fixed shutter time recovery device.

Inhibition circuits 14, 15 and an OR circuit 03 are connected to each counting output terminal of the optical response pulse counter 3 as shown in the figure.
Furthermore, OR circuits 04 to 07 are connected to the output sides of these circuits as shown.

Then, the output of the OR circuit Q becomes the prohibition input of the prohibition circuit 1, the output of the prohibition circuit 06 becomes the prohibition input of the prohibition circuit 12, and the output of the OR circuit 07 becomes the prohibition input of the prohibition circuit 13. The block 14 constitutes a shutter time recovery device selection circuit. Next, the operation of the above embodiment will be explained.

When the camera is pointed toward the subject and a power switch (not shown) is closed, the light response timer outputs a signal "1" with a time length corresponding to the intensity of the photographing light and adds it to the AND circuit A. While this signal continues, the reference pulse output from the reference pulse generator 2 passes through the AND circuit A, receives a predetermined frequency division according to the sensitivity of the film at the frequency divider D, and is counted and stored by the binary counter 3. Ru. In this example, this memory is stored only in the first row of the counter 3 when the shooting light is high brightness and inappropriate light, in the second to fourth rows when the shooting light is appropriate light, and in the second to fourth rows when the shooting light is low brightness and inappropriate light. The signal "1" is held in each of the fifth and sixth stages. On the other hand, the fixed time timer 7 starts operating in synchronization with the optical response timer 1, and applies a signal "1" of a fixed time length to the AND circuits A2 and A3.

As a result, one side of the reference pulse passes through the AND circuit A2 and the frequency divider D2, and is counted and stored by the binary counter 8, and the other side passes through the AND circuit A3 and the frequency divider D3, and is counted and stored by the binary counter 11. . In this case, the stored value of the counter 8 is a relatively large value corresponding to the lower limit of the appropriate light range, that is, in terms of the storage range of the counter 3, it is equivalent to the case where the first to fourth stages all hold the signal "1". It is adjusted by the frequency divider D2 so that the value becomes . Also counter 1
The stored value is adjusted by the frequency divider D3 so that it becomes a relatively small value corresponding to the upper limit of the appropriate light range, that is, a value equivalent to when the second stage of the counter 3 holds the signal "1". There is. Based on the above-mentioned prerequisite operation, we will first describe the case where the photographing light is appropriate light. In this case, as mentioned above, the signal "1" is stored in the second to fourth stages of the counter 3, and the appropriate light indicator lamp L2 lights up and the output of OR circuit ○ becomes "1".

This signal "1" passes through the prohibition circuit 15, one passes through the OR circuit 06 to cut off the prohibition circuit 12, and the other passes through the OR circuit 07 and cuts off the prohibition circuit 13. Since the prohibition circuit 14 is also cut off by the output of the prohibition circuit 15, the output from the OR circuit 05 is "0", and the prohibition circuit 1 is in an open state. Then, the photographer turned to lamp L2.
When the shirt is opened by the shirt release and the switch S is closed at the same time, the reference pulse is added to the binary counter 4 and counted. When this count value becomes equal to the value stored in the binary counter 3, a match signal is output from the match signal 5, and this output is used. Shirt closing circuit 6
is stirred up, the electromagnet Lo is activated, and the shirt cover is closed. That is, in this case, it operates like a normal matching digital electric shirt. Next, when the photographing light is low-intensity inappropriate light, the memory of the counter 3 extends to the fifth stage and above, and the lamp L3 or L4 is lit to indicate that the light is inappropriate.

Therefore, in this case, the photoresponsive shutter time restoration device M cannot restore the shutter time. In this case, conventionally, the aperture F is adjusted by clearing Karinba 3,
This requires the troublesome operation of restarting the light response timer 1 to obtain new photographing light information and re-memorizing this information in the counter 3. The present invention improves this point, and firstly,
The low luminance inappropriateness of the photographing light is determined based on the lighting conditions of the lamps L3, L4, etc. For example, if only lamp L3 is lit, the degree of inappropriateness is determined to be 1 step, so the aperture F
If one step is opened, the photographing light enters the appropriate light range, and if it is counted by the counter 3, the intensity will be such that the first to fourth steps all hold the signal "1". Since this is the same as the storage state of the counter 8 described above, in this case, the stored value of the counter 8 is used as is to restore the shutter time. Note that in the case of inappropriate low-luminance light, the OR circuit 03 outputs a signal "1". This signal cuts off the inhibit circuit 14, and also cuts off the OR circuit Q.
The other circuit passes through the OR circuit 07 to shut off the prohibition circuit 13. However, OR circuit 0
Since all inputs of 6 are "0", the inhibit circuit is now in an open state. Therefore, when the photographer recognizes that only lamp L3 is lit, he opens the aperture F by one stage and closes the switch S at the same time as opening the shirt shutter by releasing the shirt, and the reference pulse is added to the binary counter 9 and counted. be done. When this count value becomes equal to the value stored in the counter 8, a coincidence signal is output from the coincidence circuit 10, and the shirt closure circuit 6 is driven to close the shirt closure. In this case, the shutter time is the same slow speed fixed shutter time as when the slowest shutter speed is turned off by the light-responsive shutter time restoration device M. Next, in the case of inappropriate high-intensity light, a signal "1" is stored only in the first stage of the counter 3 in this example.

In this case, since only the lamp L is lit, it is determined that the high brightness inappropriateness level is 1st level. Therefore, when the diaphragm F is closed by one stage, the photographing light enters the appropriate light range, and in terms of the count value of the counter 3, the intensity becomes such that the second stage holds the signal "1". Since this is the same as the storage state of the counter 11, the stored value of the counter 11 is used to restore the shutter time. In addition, in the case of high-intensity inappropriate light, only the first stage of the counter 3 stores the signal "1", so the output from the OR circuit ○,,03 is "0", and the OR circuit 0
The output of 4 is also "0". Therefore, the signal "rl" is output only from the prohibition circuit 14, one of which interrupts the prohibition circuit 1 via the OR circuit 05, and the other interrupts the prohibition circuit 12 via the OR circuit 05. However, OR circuit 07-2
Since both inputs are "0" and their outputs are also "0", the gate of the inhibition circuit 13 is in an open state. Therefore,
When the photographer closes the aperture F by one step and closes the switch S at the same time as the shirt release, the reference pulse is added to the binary counter 12 and counted. When this count value becomes equal to the value stored in the counter 1, a coincidence signal is outputted from the coincidence circuit 13, and the shirt closure opening circuit 6 is driven to close the shirt closure. The shirt starter time in this case becomes the same high-speed fixed shirt starter time as when the highest speed shirt starter is turned off by the photoresponsive shirt starter time restoration device M. In this embodiment, for convenience of explanation, the number of storage stages for proper light and inappropriate light at high and low brightness is reduced, but of course, even if the number of stages is increased, the above method can be used. Without the need for troublesome operations such as restarting the light-responsive pulse generator or restarting the light-responsive pulse generator, you can immediately cut the appropriate aperture by simply correcting the aperture.

Therefore, there are advantages in that the photographing light range is expanded, the degree of use of the camera is increased, and there is less risk of losing an important shooting opportunity. Now, in the light-responsive shutter time restoration device M in the above-described embodiment, the limit value of the slow speed shutter is usually set to about 1/3 inkstone in consideration of camera shake, and the upper limit of the high speed shutter is, for example. It is assumed to be 1/500 second.

However, depending on the usage conditions of the camera, there are cases where slower speed shooting is used stably, and there are cases where higher speed shooting is desired. Fig. 2 shows a modification of the embodiment shown in Fig. 1 in which the range of memorized values for appropriate light outside the photoresponse pulse counter can be changed at any time to meet the above requirements. be.

In FIG. 2, only related essential parts are shown with the same reference numerals as those in the embodiment shown in FIG. 1, and other omitted parts are shown in the embodiment shown in FIG.
It is the same as the embodiment shown in the figure. In this modification, a switching switch Sa is provided at the first stage of the high-intensity inappropriate optical storage stage of the photoresponse pulse counter 3, and a switching switch Sb is provided at the fifth stage, which is the first stage of low-intensity inappropriate optical storage. They are connected to the OR circuits ○, 03 as shown in the figure. Then, the frequency division ratio of the frequency divider ○3 is switched to a predetermined value by the switching of the switching switch Sa, and the frequency division ratio of the frequency divider D2 is switched to a predetermined value in conjunction with the switching of the switching switch Sb. It looks like this.
The apparatus shown in FIG. 2 is the same as the embodiment shown in FIG. 1 when the movers of the switching switches Sa and Sb are in the positions shown.

When the switching switch Sb is switched from the state shown in the figure, the stored value of the fifth stage also enters the proper light state. In other words, the appropriate light range is extended by one stage to the low-luminance inappropriate light range. This time, the sixth stage is considered to be the first low-luminance inappropriate stage. Accordingly, it is necessary to increase the stored value given to the counter 8 by one step from the above value, and for this reason, the frequency division ratio of the frequency divider D2 is switched in conjunction with switching of the switching switch Sb. It is. Next, when the sliding door switch Sa is switched from the state shown in the figure, the stored value of the first stage also enters the proper light range. That is, the appropriate light castle is extended by one step to the high-intensity inappropriate light area. In response to this, the frequency division ratio of the frequency divider D3 is switched so that the stored value of the counter 11 is decreased by one step from the above value. By operating the switching switches Sb and Sa described above, the shirt time that can be restored by the photoresponsive shirt evening time restoration device M without requiring correction of the aperture is as follows:
For example, in a slow speed shirt, 1/15 from 1'3 sand, and in a high speed shirt, 1/100 from 1'50 sand.
The actual thing itself is expanded.

In other words, since the shooting light range that does not require aperture correction increases,
As the utilization of the camera further improves, chances of shooting will also increase. In addition, although the above embodiment used a photoresponse timer and a reference pulse generator in the configuration of the photoresponse pulse generator, a fixed time timer was used instead of the photoresponse timer, and a photoresponse timer was used instead of the reference pulse generator. A pulse oscillator may also be used. Further, in the above embodiments, the present invention is applied to a matching type digital electric shirt, but the present invention can also be applied to a so-called subtraction type digital electric shirt using an addition/subtraction counter. .

As described above, the present invention provides, in addition to a light-responsive shutter time restoring device that provides different shirt sunset times depending on the intensity of photographing light, a fixed speed shutter time restoring device that provides a predetermined long shirt time, and a fixed shutter time restoring device that provides a predetermined long shirt time. A high-speed fixed shutter time restoring device that provides a short shutter time is installed, and a light-responsive shutter time restoring device is operated when the shooting light is appropriate.
In the case of low brightness inappropriate light, the traverse speed shutter time restoration device is operated after correcting the aperture according to the degree of inappropriateness, and in the case of high brightness inappropriate light, the aperture is corrected according to the degree of inappropriateness and then fixed at high speed. This is designed to operate a shutter time restoration device.

Therefore, according to the present invention, when the photographing light is inappropriate, there is no need to clear the memory of the photoresponse pulse counter, generate a new photoresponse pulse, store it, etc., and respond to the inappropriateness of the photographic light. By simply correcting the aperture, it is possible to immediately take a picture within a predetermined shutter time. This has the advantage of speeding up the photographing process, expanding the photographing light field, and increasing the photographic performance.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the invention, and FIG. 2 is an explanatory diagram showing a partial modification of the invention. G...Photoresponse pulse generator, F...Aperture, P...Photodetector, 2...Reference pulse generator, 3...・Photoresponse pulse counter, M・
...Photoresponsive shutter time restoration device, L, ~L4・
...Lamp as a photographing light information display device, 6...
・Shuttle opening device, 7... Fixed time timer, 8
.....First auxiliary counter, L..Low speed fixed shutter time restoration device, 11..Second auxiliary counter, Day...High speed fixed Shatta time restoration device, 14...Shatta time restoration device selection circuit. Figure 2 Figure 1

Claims (1)

[Claims] 1. A photoresponse pulse generator that generates a number of photoresponse pulses corresponding to the intensity of field light that has passed through a lens and an aperture, a reference pulse generator that generates a reference pulse at a constant cycle, and the photoresponse pulse generator that generates a reference pulse at a constant cycle. A light response pulse counter for counting and storing pulses is provided, and a shutter closing signal is generated when the number of the reference pulses applied by the shutter release has a certain relationship with the stored value of the light response pulses in the light response pulse counter. A photoresponsive shutter time restoration device that outputs a photoresponse shutter time, a photoresponse shutter time restoration device that displays the intensity of photoresponse light based on the stored value of the photoresponse pulse counter, and a photoresponse pulse generator that simultaneously operates for a certain period of time. A predetermined number of reference pulses are received via a fixed timer that outputs a time signal of the fixed timer, a first gate circuit that opens only when the time signal of the fixed timer is output, and a first frequency divider, and a first auxiliary counter having a stored value equal to the number of light response pulses corresponding to the lower limit of the appropriate light range; a slow speed fixed shutter time restoration device that outputs a shutter close signal when a certain relationship with the stored value is reached, and a predetermined number of reference pulses that are received through the first gate circuit and the second frequency divider. a second auxiliary counter having a stored value equivalent to the number of photoresponse pulses corresponding to the upper limit of the appropriate range of field light; a high-speed fixed shutter time restoration device that outputs a shutter close signal when the stored value of the auxiliary counter reaches a certain value; and A different control signal is output depending on which of the high brightness inappropriate light regions the value belongs to, and the second gate circuit is controlled by the control signal to cause a predetermined one of the shutter time restoration devices to perform shutter operation. A composite digital electric shutter comprising a shutter time recovery device selection circuit that inputs the reference pulse upon release, and a shutter closing device that operates in response to a shutter closing signal output from any of the shutter time recovery devices. .