JPS5814656B2 - Rotating coder type binary electric shutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary coder type binary electric shutter.

All conventional binary electric shirt starters have the following principle of construction:
A pulse oscillator to obtain pulses corresponding to the field light and a timer circuit to cut out the number of pulses corresponding to the shutter time from the pulse train output from this oscillator were also required.

In such a binary electric shutter, if the oscillation pulse frequency of the pulse oscillator is correct, the accuracy of the shutter time is entirely determined by the timer time.

However, the timer circuit is generally an analog type having a CR timer circuit, and there is a problem in this point.

That is, the timer circuit having the CR time-setting circuit has a negative effect on the shutter time due to problems such as leakage of the time-setting capacitor and input impedance of the switching element.

Therefore, it must be said that it is a contradiction that the conventional binary electric shutter uses a digital structure to improve the accuracy of the shutter time, but uses an analog structure for the timer circuit, which is its most important point.

In addition, if the pulse oscillator is configured to have an error, this error and the above-mentioned drawbacks will be compounded, making it impossible to regulate the shutter time correctly.

Furthermore, when using a timer circuit, there is a drawback that the longer the shutter time, the longer the storage time.

This is because the darker the object, the longer the timer time, and in the past, for example, when storing 1000 pulses, they were stored cumulatively as 1, 2, 3, etc.
This is because zero operations are required.

Furthermore, if the storage time becomes long, there is also the drawback that an unnecessarily large number of pulses must be counted.

For example, if the shutter time is 1 second with one pulse per millisecond, 1024 pulses are required, but in this case 1024 pulses are required.
There is only an ILV (light value) gap between the last stage 7 flip-flop circuit that stores the 24th pulse and the previous stage flip-flop circuit that stores the 0.5 second shutter time. 7, one step before the last step
After the 7-rip-flop circuit completes storage, an additional 512 pulses must be counted for the final 7-rip-flop circuit to complete storage.

As described above, in the conventional binary electric shutter shutter, the number of pulses increases significantly as the shutter time becomes longer, but on the other hand, the number of pulses decreases significantly when using a high-speed shutter of 1 millisecond.

This is because a counter known as a conventional binary electric shutter is simply repurposed.

Known counters are counters that simply count numbers.

In other words, it is unique in that it counts without dropping even a single pulse.

However, the electric shutter only needs to store the number of pulses required for the shutter time.

In other words, it is a good idea to thin out the number of pulses appropriately.

Considering the above, it is considered inappropriate to use a pulse counter for an electric shutter.

A principal object of the present invention is to provide a rotary coder type binary electroshutter that does not use timers and photoresponsive oscillators, which can cause errors.

Another object of the present invention is to provide a rotary coder type binary electric shutter that can instantaneously store the shutter time regardless of the shutter time.

Another object of the present invention is to provide a rotary coder type binary electric shatterer that can rationally convert shatter time by selecting a code.

Another object of the present invention is to provide a rotary coder type binary electric shutter that can perform code conversion using a rotating body.

Another object of the present invention is to provide a rotary coder type binary electric shutter that can perform exposure multiplication counting control.

Embodiments of the rotary coder type binary electric shutter of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the rotary coder type binary electric shirt of the present invention.

In the figure, 1 is a photoelectric conversion circuit that converts field light information into an electrical signal Vp, and in this embodiment, a photoelectric element 2 such as CdS is used.
, variable resistors 3 and 4, and a transistor 5, and is configured to output an emitter horograph voltage according to field light as an optical information electric signal Vp.

As the photoelectric element 2, in addition to CdS, for example, a solar cell,
A photodiode, phototransistor, etc. can be used.

Reference numeral 6 denotes a cylindrical rotating body that is driven and rotated by a rotary drive means (not shown) such as a motor when the photoelectric conversion circuit 1 is operated, and 1 is fixedly installed on the outer periphery of the rotating body 6 and rotates when supplied with power from a power source 8. Rotation angle signal V according to change in rotation angle of body 6
9 is a brush that takes out the rotation angle electric signal VO, and 10 is a rotation angle electric signal generator that generates a voltage signal that increases as the rotation angle increases. In order to convert the electrical value (voltage value in this embodiment) at each position corresponding to the position where the value is generated into a code (sign) corresponding to the shutter time, This is a binary code indicating the shutter time arranged in the direction of the rotation axis.

The binary code indicating the shutter time is provided by, for example, being colored, perforated, covered with conductive foil, or magnetically recorded.

In the embodiment, a binary code 10 is recorded by a hole.

111 to 114 are rotation angle electrical signals Vo generated by the brush 9.
This is a code detection element provided to read the binary code 10 at that time at the extraction position.

For example, when reading is performed photoelectrically, these code detection elements include CdS, phototransistor,
Photoelectric elements such as photodiodes and solar cells are used, and when reading is done electrically, a brush is used. When reading is performed mechanically, a magnetic element such as a reproducing head is used.

When the binary code 10 is provided as a hole, a light source is provided in the rotating body 6.

The rotary body 6, the binary code 10, the code detection elements 11 to 114, etc. constitute a rotary code converter 12 that converts the rotation angle signal Vo into a binary code electric signal indicating the timer time.

13 is a field light information electric signal Vp and a rotation angle electric signal V
o and a comparator which compares these as input and outputs a coincidence signal 1 when they match; 14 is a normally open switch provided in the electric path leading from the brush 9 to the comparator 13 and closed in synchronization with the shirt release; Reference numeral 15A denotes an RS-flip-flop circuit (hereinafter referred to as an FF circuit) as a self-holding circuit which receives the coincidence signal 1, inverts it, and continuously outputs the storage command signal 1.

), 15B is a differentiation circuit that differentiates the set signal of the FF circuit 15A, that is, the storage command signal 1, and prevents it from being output continuously.

The FF circuit 15A and the differential circuit 15B constitute a storage command circuit 16.

17 is a reference pulse generator that generates a reference pulse, and 18 is a normally open switch.

Reference numeral 19 stores a binary code electric signal indicating the shutter time from the rotary code converter 12, and counts the reference pulses inputted from the reference pulse generator 17 by the shirt taller release, and corresponds to the binary code. This is a shirt starter time recovery circuit that restores the shirt starter time and outputs a shirt starter close signal.

This circuit 19 is connected to a register 20 storing a binary code electrical signal and a reference pulse given via a normally open switch 18 in synchronization with the shirt release. The apparatus includes a pinary counter 21 for counting, and a matching circuit 22 for issuing a shirt closure signal when the counted value of the counter 21 matches the value stored in the register 20.

The register 20 is configured as a well-known register including flip-flop circuits (hereinafter referred to as FF circuits) 231 to 234 connected in multiple stages, and displays the shutter time as necessary in each FF circuit, although not shown. A light emitting visual recognition body such as a light emitting diode is connected and configured.

The pinary counter 21 is a multi-stage connected flip-flop circuit (hereinafter referred to as an FF circuit).

) 24 to 244.

Is 25 a shirt from the rotary code converter 12? This is a gate circuit that controls passage of a binary code electric signal to be applied to the restoration circuit 19, and includes AND circuits 26 to 264 connected in multiple stages.

One input terminal of these AND circuits 26 and 264 is connected to the output terminal of the corresponding code detection element 11 to 114, and each of the other input terminals is commonly connected to the output terminal of the differentiating circuit 15B.

Reference numeral 21 denotes a shirt starter closing control circuit which controls the shirt starter closing when a shirt starter closing signal is given from the shirt starter time restoration circuit 19 via the normally open switch 28, and the shirt starter closing control relay 29 controls this relay. It includes a controlling thyristor 30 and a resistor 31, and is connected as shown in the figure.

In this embodiment, the normally open switches 14, 18, and 28 are operated sequentially in conjunction with the suppressing operation of the shirt release button. First, the switch 14 is closed, and then the switch 2 is closed.
8 is closed, and then switch 18 is closed.

In such a rotary coder type binary electric shutter, when a power switch (not shown) is closed and the camera is pointed toward the subject, the field light information at that time is received by the photoelectric element 2 of the nine-electric conversion circuit 1. Correspondingly, an optical information electrical signal Vp is generated in the variable resistor 4 connected to the emitter of the transistor 5, and this is inputted to one terminal of the comparator 13.

Also, the rotating body 6 is not shown when the power switch is closed. It is driven by the rotation driving means and starts rotating.

As the rotary body 6 rotates, each binary code 10 provided on the surface thereof is sequentially read as a binary code electric signal (voltage signal) via the code detection elements 11 to 114 and sent to each AND circuit of the gate circuit 25. ? It is applied to one input terminal of 6 to 264.

However, the other input terminal of each AND circuit 26, to 264 is an RS-F which is in a reset state and has a signal O.
Since they are connected to the set side terminal of the F circuit 15A, the gates of these AND circuits 26 to 264 are all non-conductive, and therefore the binary code electric signal is not sent to the register 20 of the shutter time restoration circuit 19. It won't happen.

Under these circumstances, when the subject is determined and the shirt button is pressed, the normally open switch 14 is first closed.

When the normally open switch 14 is closed, the rotation angle electric signal (voltage signal) Vo generated in the rotation angle electric signal generator 1 provided on the rotating body 6 is transmitted to the brush 9. The rotation angle electrical signal Vo is applied to the comparator 13 and compared with the optical information electrical signal Vp, and when the rotation angle electrical signal Vo gradually increases as the rotating body rotates 60 times and matches the optical information electrical signal Vp, a coincidence signal 1 is output from the comparator 13. It is applied to the RS-FF circuit 15A.

As a result, the FF circuit 15A is inverted, and the storage command signal 1 is sent from the set side output terminal to the differentiating circuit 15B.

The differential output generated at that moment, that is, the storage command signal 1, is applied to AND circuits 26 to 264 through a waveform shaping circuit (not shown) as necessary.

At this time, the binary code electric signals corresponding to the shutter times read from the code detection elements 11 to 114 are stored in each of the FF circuits 23 to 234 of the register 20.

Thereafter, the normally open switch 28 is closed in conjunction with the shirt shutter release, and when the normally open switch 18 is then closed, the shirt shutter is opened and the reference pulse from the reference pulse generator 17 is applied to the shutter time restoration circuit 19. is applied to the pinary counter 21 of .

When the count value of the counter 21 becomes equal to the stored content of the register 20, that is, when the shutter time is restored, a shutter closing signal is sent from the matching circuit 22 to the shutter closing control circuit 27, and the shutter closing signal is sent to the shutter closing control circuit 27. Closing takes place.

Note that the normally open switch 28 is used to prevent the matching circuit 22 from being activated when the contents of the register 20 and the pinary counter 21 are O in the initial stage, thereby preventing a control signal from being given to the shirt closure control circuit 27. However, depending on the internal structure of the shutter time restoration circuit 19, this switch can be omitted.

? The above is the gist of the operation of the rotary coder type binary electric shirtter of this embodiment, but in order to operate the shirtter of this embodiment more completely, it is desirable to take the following considerations.

(1) If the normally open switch 14 is closed by the shirt release while the rotational angle electrical signal Vo generated from the rotational angle electrical signal generator 7 is increasing, an output is immediately generated from the comparator 13 and comparison cannot be made. It is desired to synchronize the point in time when this switch 14 is closed correctly with the rising point of the rotational angle electric signal Vo, more precisely, when Vo=O.

(2) Is it stored only once in the register 20 of the shutter time restoration circuit 19 via the AND circuits 26 to 264? It is desired that the signal is not affected in any way by the subsequent binary code electrical signal.

If you do not do this and leave it alone, the contents of the register 20 will all become 1.

Furthermore, if a matching pulse is output from the comparator 13 between the lines of the binary code 10, a differential pulse will be generated even though there is no binary code 10, so that from now on, the code detection elements 11 to 11
When 4 reaches the position of the binary code 10, the binary code electrical signal is no longer stored in the register 20.

First, an example of a means for satisfying item (1) is shown in FIG.

In this embodiment, reference numeral 1 denotes a rotational angle electric signal generator made of a resistor provided in a band shape around the outer periphery of the rotating body 6, and its starting end 7a is connected to a power feeding ring (not shown) fixed to the inside of the rotating body 6. , and is supplied with power from a power source (not shown) via a power feeding brush (not shown) that is in contact with this power feeding ring.

The resistance value of the resistor constituting the rotational angle electric signal generator 1 is set such that when the optical information electric signal Vp is generated in a multiple series, the rotation angle electric signal Vo is generated in a multiple series.

Further, when optical information electrical signals are generated at equal intervals using a known logarithmic conversion circuit, the resistance value is selected to be uniform throughout the entire length of the strip-shaped resistor.

A brush 9 is in contact with the rotational angle electric signal generator 1, and is supported by a fixed support (not shown).

Reference numeral 32 denotes a rotary contact 33 at which is fixed to the surface of the rotating body 6 in correspondence with the starting end 7a of the rotation angle electric signal generator 1.
33b is a fixed contact supported by a fixed support (not shown) corresponding to the position of the brush 9 so that the rotary contact 32 can contact the outer periphery of the rotating body 6; The connected power source.

At these rotating contacts 32, fixed contacts 33a, 33b, and power source 34, the rising point of the rotational angle electric signal VO=Vo=
A rising signal generator 35 which outputs a rising signal 1 at point O is configured.

36 is an AND circuit which takes the rising signal 1 as one input and receives the signal 1 from a power source (not shown) via a normally open switch 37 that is closed in synchronization with the shirt release.
is used as the other input.

38 is a thyristor that conducts at the output of the AND circuit 36;
9 is excited by the conduction of the thyristor 38 and becomes the normally open switch 1.
This is a relay coil that closes 4.

In an electric shirtter equipped with such means, when the normally open switch 31 is closed in synchronization with the shirtter release, a signal 1 is applied to one input terminal of the AND circuit 36 through the switch 37.

The AND circuit 36 is connected to the rising signal generator 35 at the other input terminal.
At the moment signal 1 is applied, signal 1 is output to make the thyristor 38 conductive and close the normally open switch 14.

However, the contact position of the brush 9 at the moment when the normally open switch 14 is closed in this manner is the rotation angle electric signal generator 7.
Since this is the starting end 7a of the resistor, the rotation angle electrical signal Vo starts from a zero state.

Then, as the rotating body progresses through 60 revolutions, the signal v
O is getting bigger.

Figure 2 shows the timing of turning on the switch 14 and the rotation angle electrical signal V.
This shows that the initial value of o is synchronized.

When the switch 37 is closed, if the position of the brush 9 is in the middle of the resistor as the rotation angle electric signal generator 7, the switch 14 is not closed.

This is because when the brush 9 is in the middle of the rotation angle electric signal generator 7, the rotary contact 32 is also out of the illustrated position, so the signal 1 is not applied to the AND circuit 36, and therefore the thyristor 38 is not conductive. be.

After all, there is no other position in which the switch 14 is closed in synchronization with the initial stage of the rotation angle electrical signal VO than the state shown in the figure.
The purpose of item 1) has been achieved.

Incidentally, the rising signal generator 35 is not limited to the one shown in the figure, and for example, a hole may be made at the same position and the rising signal 1 may be generated by a photoelectric element.

Further, for convenience of explanation, the switch 14 is turned on by the thyristor 38, but this may be omitted and a known semiconductor switch may be used.

For example, it is preferable to use an analog switch or the like because it does not have the delay that occurs with mechanical switches.

Next, the implementation of item (2) will be described.

Figure 3 is one way to do this.

In this embodiment, 40 represents each binary code 1 on the rotating body 6.
0 row (that is, each code is aligned in the axial direction of the rotating body 6 as described above).

41 is provided facing the rotor 6 to detect the synchronization mark 40, and when detected, a synchronization signal is generated. Kyuden who gets 1? These detecting elements constitute a synchronizing signal generator 42.

Reference numeral 43 designates an AND circuit as a coincidence signal passage control circuit which takes the synchronization signal 1 as one input, takes the coincidence signal 1 from the comparator 13 as the other input, and outputs the signal 1 to the FF circuit 15A when these two inputs are aligned. .

In the electric shirt shirt equipped with such a means, when the code detection elements 11 to 114 are detecting the line spacing of the binary code 10, for example, the line spacing between the first line code and the second line code is detected. , even if a match signal 1 is output from the comparator 13, this signal 1 is sent to the AND circuit 43.
has not yet received the synchronization signal 1, so the AND circuit 43
Since signal 1 is not outputted from , the binary code electric signal corresponding to the field light is not sent to the shutter time recovery circuit 19 .

When the rotating body 6 further rotates and reaches the display position of the binary code 10 on the second line, the code detection elements 111 to 11 are activated at this moment.
A binary code electric signal is generated from the detection element 41, and a synchronization signal 1 is generated from the detection element 41.

This synchronization signal 1 opens the AND circuit 43 for a short time, inverts the FF circuit 15A, and continuously sends the storage command signal 1 to the differentiation circuit 15B. The signal is gate circuit 2
5 and is stored in the register 20 of the shutter time restoration circuit 19.

Thereafter, even if a subsequent binary code electric signal arrives, it will not affect the register 20 because it will be blocked by the FF circuit 15A.

Furthermore, in this case, the binary code electric signal based on the differential pulse may be sent to the register 20 in an extremely short time within an operable range.

Therefore, the design is extremely easy, and there is no need for troublesome considerations such as selecting the duration of the differential waveform in consideration of the rotational speed of the rotating body 6 or the time corresponding to the distance between lines of the binary code 10.

Further, the synchronizing signal generator 42 is useful when a large number of binary codes are provided on a rotating body having a constant surface area to increase the degree of integration and to increase the accuracy of the shutter time.

FIG. 4 shows ten examples of nine electric conversion circuits for generating equally spaced voltages as optical information electrical signals Vp in response to multiple series changes in field light.

That is, in the transformer conversion circuit 1 of this embodiment, instead of the variable resistor 3 used in the circuit 1 shown in FIG. 1, a known logarithmic conversion element 44 such as a log diode or a transistor using only one of two terminals is used. It uses

FIG. 5 proposes an extremely important means for over- or under-exposure, such as backlight correction, or depending on the photographic intention.

That is, in this case, the rotation angle signal Vo generated by the rotation angle electric signal generator 7 is not directly applied to the tile comparator 13, but is applied to the emitter of the transistor 45a via the transistor 45a and the variable resistor 45b. The structure is such that the generated voltage is varied by a variable resistor 45b and then applied to the comparator 13.

These transistor 45a and variable resistor 45b constitute an exposure multiple controller 46.

If the slider 45b1 of the variable resistor 45b is properly placed at the position shown in the figure, the negative can be overexposed or underexposed by moving the slider 45b1 up and down.

However, this device has manual exposure multiple control.

Therefore, at the position corresponding to the appropriate light of the slider 45b1,
When it is more than that, +1, +2, when it is less than that, -1, -2
It would be extremely convenient to have a scale such as

FIG. 6 shows an example of a rotary coder type binary electric shutter in which the arrangement of each binary code 10 on the rotating body 6 is different from that shown in FIG. 1.

That is, in FIG. 1, each binary code 10 indicates the time
times? Although they are arranged in the direction of the rotational axis of the body 6, in this embodiment they are arranged in the direction of rotation of the rotating body 6.

For example, if these binary codes 10 are the ones in the column detected by the coat detection element 11 at the left end in the drawing? If one cycle represents a shutter time of 1/250 seconds, then the next row detected by the code detection element 11 will represent a shutter time of 1/125 seconds that differs by one step in one cycle. The columns detected by the detection elements 113, 114, . . . represent shutter times that differ by one step one after another.

In this way, in this embodiment, since only one code detection element reads the binary code 10 of the corresponding column,
Switcher 4 that sequentially switches each code detection element 11 to 116
7 is provided.

In this embodiment, the switch 47 switches between the code detection elements 11 to 1.
A ring counter 48 with the same number of binary elements 48-486 as 16 and corresponding code detection elements? AND circuits 49 to 496 whose inputs are the outputs from the binary elements, and the outputs of the AND circuits 49 to 496, that is, each code detection element 11 to
The binary code electric signal read by 116 is sent to the gate circuit 25.
It is configured to include an OR circuit 50 that provides a signal.

Further, in this embodiment, a distribution signal generator 5 for distributing a series of binary code electric signals outputted through the switch 41 and providing them to the AND circuits 26 to 264 of the gate circuit 25
1.

This distribution signal generator 51 has a movable mark 52 formed of a plurality of holes provided on the surface of a rotating body 60 with a position shifted from the binary code 10 in the direction of the rotation axis, and a code detection element 11 that reads these marks. ~On line 116? It has detection elements 53 to 534 made of photoelectric elements arranged in a row.

The moving marks 52 correspond to positions 1, Ii, iii, and iv of the marks in the circumferential direction of the binary code 10 in each column, and are shifted by one pitch in the direction of the rotation axis for each position. It is provided.

The detection elements 53 to 534 are connected to the AND circuits 26 to 264.
They are connected sequentially in a pair-to-one correspondence.

Furthermore, the apparatus of this embodiment includes a clear signal generator 54 that outputs the clear signal 1 one pulse each time the rotating body 6 rotates once.

This clear signal generator 54 has a clear mark 55 formed of a hole provided on the surface of a rotating body 60 at a position shifted from other holes in the direction of the rotation axis, and a clear signal generator 54 that reads this mark and outputs a clear signal 1. It has a detection element 56 consisting of an element.

The clear mark 55 is a binary code 1 arranged in the circumferential direction.
It is provided corresponding to the position in the circumferential direction between the starting end and the ending end of the hole No. 0.

? The rear signal is provided to the inhibition circuit 57 as a normal input signal.

The coincidence signal 1 from the comparator 13 is applied to the prohibition input terminal of the prohibition circuit 57 as a prohibition input.

The clear signal 1 that has passed through the prohibition circuit 57 is given to each FF circuit 23 to 234 of the register 20 as a clear signal 1, and is given to the ring counter 48 as a ring sending signal 1, and is further given to the thyristor 38 as a trigger signal 1. given as.

Now, in such a rotary coder type binary electric shirtter, when a power source (not shown) is closed, the rotating body 6 starts rotating.

And the code detection element? 1 to 116, the binary code electric signal is read out. Unlike in FIG. , iv, and outputs a binary code electric signal.

Then, each time the rotating body 6 rotates once, the code detection element 11
, 112, 113, etc., and the ring counter 43 of the switch 41 controls this action.

The ring counter 48 is configured such that the content signal 1 shown in the figure successively moves one stage to the right every time the rotating body 6 rotates once.

Does this type of action apply to ring counters? Alternatively, a shift register may be used.

As the rotating body 6 rotates, the code detection elements 11, to 116
reads all the binary codes 10 at the same time, but since AND circuits 49 to 496 are connected to its output terminal, only the AND circuit where the binary elements 481 to 486 of the ring counter 48 are 1 is used. It only outputs from.

In the illustrated case, the signal is output only from the AND circuit 49 and not from the other AND circuits 49 to 496.

When the rotating body 6 completes one rotation, the detection element 56 of the clear signal generator 54 reads the clear hole 55 and issues a clear signal 1, and the inhibit circuit 57 (initially, the comparator 1
Is the output of 3 O? The gate of this inhibition circuit is in an open state.

) to clear register 20.

Furthermore, since this clear signal 1 is applied to the ring counter 48 as the ring sending signal 1, the content signal 1 is sent to the next binary element 48 by one stage.

The operation shown in FIG. 6 will be further explained below.

That is, the code detection element 11 is in binary code at the position indicated by 1?
When a part of the code 10 is read, this output signal 1 is applied to the AND circuits 26 to 264 via an AND circuit 49 and an OR circuit 50.

However, at this time, the detection element 53 of the distribution signal generator 51 reads the moving mark 52 at the 1 position and applies its output to the AND circuit 26, so the register 20, whose contents were all 0 in advance when the power switch was closed, Of these, the FF circuit 23 corresponding to the AND circuit 26 stores the signal 1.

Next, the rotation progresses and the code detection element 11 moves to position ii.
When a part of the hexadecimal code 10 is read and output signal 1 is output, the detection element 532 reads the moving mark 52 at the position 1i, so from now on it will be an AND circuit? 6 outputs only the FF circuit 23 of the register 20.

Signal 1 is stored in . As the rotation progresses further, the code detection element 11.

reads part of the binary code 10 at position 11, the output signal is 0 because there is no hole at this position, and therefore the detection element 533 reads the moving mark 52 at position 111 and outputs signal 1. However, since the AND circuit 263 cannot perform the AND operation, the memory of the FF circuit 233 of the register 20 remains at 0.

Similarly, in the FF circuit 234 of the register 20, a signal 1 obtained by reading a part of the binary code 10 at the 1v position is stored.

This means that the storage of the binary code electric signal has been completed.

That is, the binary code electric signal is "110" in the register 20.
It is remembered as 1J.

Then, at the end of this storage, the photoelectric element 56 that has detected the clear mark 55 outputs a clear signal 1 (note that the output of the comparator 13 is 0 at this time).

) At this moment, all the stored contents of the register 20 are cleared and returned to 0, and the register 20 enters a storage standby state.

Further, when the clear signal 1 is output, the signal of the ring counter 48 is further moved to the binary element 483 on the right by one stage, so that only the AND circuit 493 is opened this time and enters a standby state.

This operation continues as long as there is no match signal 1 from the comparator 13.

In the above process, the comparator 13 works, so next the comparator 1
The final operation related to operation 3 will be described.

In the embodiment shown in FIG. 6, the initial stage of the rotational angle electric signal Vo must be synchronized with the initial stage of 60 rotations of the rotating body.

However, in the case of this embodiment, since the clear 55 is placed between the end and the beginning of the binary code 10, the time when the clearing action is completed is at the beginning of the next rotation, so the clear signal causes the thyristor 38 to What is necessary is to make the normally open switch 14 conductive and close the normally open switch 14.

This allows the above-mentioned initial states to be aligned.

By the way, the binary code electric signal must be extracted from the beginning in synchronization with the shirt release.
In this embodiment, the rotating body 6 starts rotating at the same time as the power supply is closed, so if the shirt release is synchronized by some method and the switch is turned on, the power supply (not shown) is turned on at any rotational position of the rotating body 6. The configuration must be such that there is no problem even when the switch is turned on.

Therefore, in order to operate these components smoothly, a configuration as shown in FIG. 7 may be used.

That is, in this embodiment, an idle stage 48o made of a binary element is provided before the ring counter 48.

The play stage 48o may be one stage or multiple stages, but if there is a risk that the idle stage 48o may be moved due to noise, a plurality of stages is preferable.

Further, as shown in the figure, a normally open switch 58 is provided in the middle and left open so that the clear signal does not operate the ring counter 48 as a ring feed signal.

Under such circumstances, even if the rotating body 6 starts rotating at the same time as the power switch is closed, the signal 1 of the ring counter 48 will not be affected and will be held at the origin? Therefore, even if binary code electric signals are output from the code detection elements 11 to 114 as they rotate, the gates of all AND circuits 491 to 494 are closed, and therefore there is no output from these, so the distribution signal is not output. Even if the distribution signal is issued from the generator 51, the register 20 is not affected.

When the switch 58 is closed simultaneously with the shirt release in such a state, the rotary body 6 detects the code detecting elements 11 to 114.
No matter what position the rotor is rotated against, the binary code electric signal as described above is not immediately output, so the operation of the circuit will not be disturbed.

When the first clear pulse is issued, does the signal 1 of the ring counter 48 become 1 for the first time? It is moved to the right binary element 48, and the gate of the AND circuit 49 is opened.At the same time, the contents of the register 20 (in this case, it should be 00 at the beginning, but as a precaution in case there is a signal 1 due to noise) Clear once.

Therefore, from this point on, as the rotating body 6 rotates, the binary code electric signals read by the code detection elements 11 to 114 are sequentially sent to the register 20, so that storage is performed extremely smoothly.

This concludes the explanation of the embodiment shown in FIG.
Similarly to the embodiment shown in FIG. 1, the exposure multiple control described in FIG. 5 is also possible.

Furthermore, exposure factor control such as ASA conversion is performed by controlling the variable resistor 3 or variable resistor 4 of the photoelectric conversion circuit 1 including the photoelectric element 2 also in the embodiments shown in FIGS. 1 to 3 and 5 to 7. This can be done by adjusting.

Also, is the photoelectric conversion circuit configured as shown in Figure 4? If so, just adjust variable resistor 4 in the same way.

In addition, in this application, it was stated that the rotating body 6 immediately rotates at the same time as the power supply is closed.

In other words, this invention gives the impression that code conversion is possible only when rotating at a constant speed, but this is because when rotating at a constant speed, code conversion is possible by correctly following rapid changes in the field light. It is.

However, in the case of the embodiment shown in FIG. 1, the binary code 10 returns to the beginning when the rotating body 6 makes one revolution, that is, the entire shutter time (pre-designed) occurs in one revolution.
is read by the code detection elements 11 to 114 in accordance with the field light, so it is not necessarily necessary to rotate at a constant speed.
This means that rotation is not required.

In other words, the rotation of the rotary body 6 may gradually increase from a stationary state by turning on the rotary body drive switch and reach one rotation.

In other words, the speed of the rotating body 6 during one rotation may vary.

This is also a feature of the present application, but this is possible because a kind of feedback system uses the rotational speed and rotational angle electrical signals V.
This is because it is configured between the

In Figure 1, the faster the rotation, the faster the signal Vo rises.
Furthermore, as the rotation becomes slower, the rise of the signal Vo becomes slower.

Therefore, whenever the coincidence signal 1 is output from the comparator 13, a binary code that generates a binary code electric signal corresponding to the field light is necessarily selected.

If this signal Vo is generated somewhere unrelated to the rotor, the rotational speed must be kept strictly constant in order to keep the mutual relationship constant.

Therefore, it will be understood how the present invention has a feedback system.

However, as mentioned above, with this method, if the field light changes suddenly, the binary code of the corresponding time cannot be selected rapidly, so in such a case, constant speed rotation is safer. be.

In the rotary coder type binary electric shirt starter mentioned above,
Although the shatter time is restored using a coincident shatter time recovery circuit, other types of shatter time restoration circuits may be used.

For example, there is a counter that stores a binary code electric signal by inverting it such as 1 to O, and counts the reference pulse inputted from the reference pulse generator by the shutter release to restore the shutter time, and each of the counters An inverting shatter time recovery circuit can be used that includes a matching circuit that provides a shatter close signal when the output signals of the stages are equal.

a down counter that stores a binary code electric signal and subtracts a stored value by using a reference pulse inputted from a reference pulse generator by a shirt starter release as a subtraction input;
It is also possible to use a subtractive shutter time recovery circuit that includes a matching circuit that issues a shutter closing signal when the output values from each stage of the down counter become equal.

Further, in the rotary coder type binary electric shirtter described above, a cylindrical rotating body is used, but it goes without saying that a disc-shaped rotating body may also be used.

Furthermore, it goes without saying that a rising signal generator 35 as shown in FIG. 2 may be added to the binary electric shutter shown in FIGS. 5 and 6.

Next, in the valley embodiments described above, the code is binary, but in the case of the present invention, the code can be arbitrarily selected from decimal.

This is one of the very important features of the invention.

In other words, decimal numbers 1, 2, 3, etc. do not necessarily have to correspond to binary numbers, such as 001, 010, 011, etc.; for example, 001, 010, 111, etc. You can select any one according to your shooting intention.

That is, in this case, if we choose binary numbers such as 001, 010, Oil, etc. as mentioned above for the decimal numbers 1, 2, 3, etc., then naturally when restored to the shirt time, we get 1, 2, 3, etc. ...but if you convert it to a modified code like 001, 010, 111..., this will become 1, 2, 7..., and the shutter time will remain the same when it is bright. However, when it gets dark, it can be said that the shutter time is lengthened to provide sufficient exposure.

As explained above, according to the rotary coder type binary electric shirt shutter of the present invention, the following excellent effects can be obtained.

(a) Since a timer and a photoresponsive oscillator are not used, errors are eliminated and the accuracy of the shutter time can be improved.

(b) The storage of the shirtta time becomes independent of the shirtta time, and moreover, the storage of the shirtta time can be completed instantaneously.

(C) Since the code can be arbitrarily selected, it is possible to easily correct the imbalance of shatter time in well-known binary electric shatterers, where the shatter time is sparse in bright places and conversely dense in dark places, and to average this out. There is.

In other words, depending on how you choose the code, you can convert the shirt time into a drunken time.

(d) Since the exposure multiple controller is provided in the electrical path from the rotation angle electrical signal generator to the comparator, exposure multiple control can be easily performed even in this type of rotary coder type binary electric shutter.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of the binary electric shatter of the present invention, and Fig. 2 is a block diagram showing an example of the binary electric shatter of the present invention, in which a comparator is provided with the function of giving a rotation angle electric signal from its rising point. , Fig. 3 shows a biner according to the present invention which has a function of storing a code electric signal only once for one photometry. A block diagram showing an example of an electric shock absorber,
Fig. 4 is a circuit diagram showing another example of a photoelectric conversion circuit, Fig. 5 is a main part configuration diagram showing an example of a binary electric shirt of the present invention provided with an exposure multiple control function, and Fig. 6 is a diagram showing the arrangement of codes. FIG. 7 is a block diagram showing an example of a modified binary electric shutter of the present invention, and FIG. 7 is a block diagram of essential parts showing an example of the binary electric shutter shown in FIG. It is. 1... Photoelectric conversion circuit, 6... Rotating body, 7... Rotation angle electric signal generator, 10... Binary code, 11 to 116...
Code detection element, 12...Rotary code converter, 13...
...Comparator, 17...Reference pulse generator, 19...Shasota time recovery circuit, 45b...Variable resistor, 45b1...
Slider, 46... Exposure multiple controller.

Claims (1)

[Scope of Claims] 1. A photoelectric conversion circuit that converts field light information into an optical information electrical signal, a rotating body on which a plurality of codes indicating shutter time are recorded, and a rotating body that converts field light information into optical information electrical signals when the nine electric conversion circuit is activated. a rotary type code converter that converts the optical information electrical signal into a code electrical signal corresponding to the optical information electrical signal, which is equipped with a rotation driving means for rotationally driving the optical information signal and a code detection element that reads the code and outputs a code electrical signal; a rotation angle electrical signal generator that generates a rotation angle electrical signal according to a change in the rotation angle of the body; and a rotation angle electrical signal generator that compares the magnitudes of the optical information electrical signal and the rotation angle electrical signal and generates a match signal when the two match. A comparator that generates a reference pulse, a reference pulse generator that generates a reference pulse, and a reference pulse generator that stores the code electric signal and counts the reference pulse input from the reference pulse generator by the shutter release, restores the shutter time, and releases the shutter. It has a shutter time restoration circuit that outputs a closing signal, and a gate circuit that controls so that the code electric signal is passed through and stored in the shutter time restoration circuit only when a matching signal is output from the comparator. Rotary coder type binary electric shirt starter. 2. A photoelectric conversion circuit that converts field light information into an optical information electrical signal, a rotating body on which a plurality of codes indicating shutter time are recorded, and a rotational drive means that rotationally drives the rotating body when the photoelectric conversion circuit is activated. and a rotary code converter that is equipped with a code detection element that reads the code and outputs a code electric signal and converts the optical information electric signal into a code electric signal corresponding to the optical information electric signal; a rotation angle electrical signal generator that generates a rotation angle electrical signal according to the rotation angle; a comparator that compares the magnitude of the optical information electrical signal and the rotation angle electrical signal and outputs a matching signal when the two match; A variable resistor is connected to an electric line connecting the angle electric signal generator and the comparator, and the exposure multiple is controlled by changing the rotation angle electric signal by changing the position of a slider of the variable resistor. an exposure multiplier controller that generates a reference pulse, a reference pulse generator that stores the code electric signal, and counts the reference pulses input from the reference pulse generator by a shunter release, and calculates the shunter time. a shirt starter time restoration circuit that restores and outputs a shirt starter closing signal; and control so that the code electric signal is passed through and stored in the shirt starter time restoration circuit only when a matching signal is output from the comparator. A rotary coder type binary electric shutter having a gate circuit.