JPS6032172B2 - Second time control circuit for programmable electric shutter linked to light receiving aperture - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a second time control circuit in a programmable electric shirt linked to a light receiving aperture, and the start of measurement of the exposure time control circuit is electrically controlled without using a mechanical switch. The present invention provides a time control circuit that allows an electric circuit and an opening/closing mechanism to operate stably.

Embodiments of the present invention will be described below based on the drawings.

First, the structure of the shirt shutter mechanism shown in FIGS. 1 to 9 will be explained. Reference numeral 1 denotes a shutter plate which forms an exposed opening la and a light receiving window lb, and also has pins lc to li arranged thereon. Reference numeral 2 denotes a spring plate, which has long grooves 2a, 2b and bends 2c that are engaged with pins lc, ld, and has a pin 2d as a shield, and is held by a spring 3. An upward mobility habit is given. Reference numeral 4 denotes a closing drive plate, which has long grooves 4a and 4b that are horizontal to the pins lc and le, arms 4c and 4d, an inclined surface 4e, and a flat surface 4.
At the same time as forming a pin f, a pin 4g is installed as a shield, and a pin le
A rightward movement habit is given by a spring 5 applied to and 4g. Reference numeral 6 denotes a leaf spring member, which is fixed on the closing drive plate 4 with screws 6a and 6b, and has bends 6c and 6d at both ends that protrude toward the back side of the closing drive plate 4, respectively, as shown in FIG. It has 6c' and 6d'.

The bend 6c is adapted to engage with the bend 2c of the lead plate 2. Reference numeral 7 denotes a shirt release lever pivotally connected to a shaft 8, which forms arms 7a, 7b and another arm 7c that can be engaged with a pin lf, and the tip 7a' of the arm 7a is positioned within the movement trajectory of the bending 6d. The arm 7a is bent by a spring 9 so as to be dextrorotatory so as to engage the pin lf.

Reference numeral 10 denotes an opening/closing lever pivotally connected to a shaft 11, which has an arm 10a that can engage with the arm 7c, and a non-conductive pin 1.
0b, a protrusion 10c, and pins 10d to 10g are arranged as a shield. A conductive ring 12 is fitted onto the pin 10b.

A spring 13 also serves as a lead wire, and is hung between the pin li and the conductive ring 12, giving levorotation to the opening/closing lever 10.

The arm 4d of the closing drive plate 4 is connected to the conductive ring 12 of the opening/closing lever 10.
The arm 4d and the conductive ring 12 constitute a synchro switch. Reference numeral 14 designates one of a set of two shutter blades that also serves as an aperture blade, and includes long grooves 14a and 14b that engage pins 1g and lb, and a long groove 14 that engages pin 10d.
c, a shirt opening row 4d, an opening 14e for introducing exposure warning information, and a closing opening 14f for introducing exposure information.

The other shutter blades (not shown) have their exposure warning information introduction openings aligned with the exposure warning information introduction closing openings 14e of the shutter blades 14; It is formed laterally symmetrically with that of the long groove 14b, and the long groove corresponding to the long groove 14b is aligned with the pin 10e. And the light receiving element is
It is arranged corresponding to the light receiving window lb, and can receive field light through the open row 4e or the open row 4f.
Reference numeral 15 denotes an iron bar pivotally attached to the shaft 16, which forms a bend 15a for locking the arm 4c and another bend 15b, and also has a pin 15c as a shield.

Reference numeral 17 denotes an iron piece, which is pivotally mounted on the bend 15b by a pin 18.

19 is a hold lever pivotally connected to the shaft 16, and the slope 4e
A pin 19a that can be engaged with the flat surface 4f is provided as a shield, and an arm 19b that is engaged with the pin 15c is formed, and the spring 2
0 gives dextrorotation.

21 is an iron piece spring, and iron piece spring 15 and hold lever 1
9, and acts to press the pin 15c and arm 19b into contact with each other.

Reference numeral 22 designates a flush Sekiguchi lever pivotally connected to a shaft 23, which forms a cam surface 22a on which the pin 10g can come into contact, and is equipped with a pin 22b that is operated by a distance adjustment member (not shown), and a spring 24. gives it dextrorotation.

Note that there is a top plate and a base plate (not shown) above and below the shirt flap plate 1, and the shirt flap blade 14 is disposed between the base plate and the shirt flap plate 1, and the flash closing lever 22 is located at the bottom. It is located on the back side of the main plate,
Other members are arranged between the shirt cover plate 1 and the top plate. Therefore, the pins 10d, 1 of the opening/closing lever 10
The pin 0e penetrates through the shutter plate and protrudes to the back side thereof, and the pin 10g further protrudes to the back side of the base plate. Incidentally, the shirt flap plate 1 and the base plate are formed with the outermost grooves that allow the movement of each pin, but these are omitted in the drawing. In addition, a shirt flap plate 1, a closing drive plate 4, and an opening/closing lever 1 are also provided.
It may also be an integrally molded product made of aluminum, resin, etc. In that case, a conductive piece may be attached to the surface of the arm 4d of the closing drive plate 4 that can engage with the conductive ring 12 to maintain electrical connection. There is a need to. Furthermore, 102, 114, and 117 are switches and electromagnets of a control circuit to be described later, and the electromagnet 117 is supported on the back side of the upper base plate or on a part (not shown) standing up from the shirt flap plate 1, so that the electromagnet 117 is connected to the surface of the shirt flap plate 1. It is placed so as to be lifted from the ground and to face the iron piece 17. Next, the configuration of the shirt tie control circuit shown in FIG. 18 will be explained in relation to the shirt tie mechanism.

Reference numeral 101 is a power supply battery, the (first) pole of which is grounded.

Reference numeral 102 denotes a power switch, which is provided opposite to the pin 2d of the release plate 2.

Reference numeral 103 denotes a light receiving element such as a photovoltaic element, whose anode is grounded and whose cathode is connected to the inverting input terminal of the amplifier circuit 104 .

105 is a logarithmic compression diode whose cathode is connected to the inverting input terminal (1) and the anode is connected to the output terminal of the amplifier circuit 104.

106 is a reference voltage circuit.

107 is a window comparator, inverting input terminal -1
07a is connected to the output terminal of the amplifier circuit 104, and non-inverting input terminals +107b and 107c are connected to the reference voltage circuit 10, respectively.
6 output terminals 106a, 106b.

108 and 109 are LEs for high brightness warning and low brightness warning
D (can also be a lamp etc.), window comparator 107
The output terminals 107d and 107e of the power supply battery 101 are connected via the power switch 102 to the (10) poles of the power supply battery 101.

Reference numeral 110 denotes a capacitor for controlling exposure time, one end of which is connected to the (10) poles of the power supply battery 101 via the power switch 102, and the other end connected to the collector or emitter of the logarithmic expansion transistor 112 or the emitter of the resistor 113 by the switch 111. It is grounded through either one.

The base of the logarithmic expansion transistor 112 is the amplifier circuit 104
is connected to the output terminal of 114 is a switch for starting exposure time measurement, which is connected in parallel to the capacitor 110;
It is provided opposite to the pin 10f of the opening/closing lever 10.

115 is a comparator whose non-inverting input terminal 10 is connected to the output terminal 106c of the reference voltage circuit 106, and whose inverting input terminal 1 is connected to the terminal of the capacitor 110.

1 16 is an amplifier circuit, which is connected to the output terminal of the comparator 115.

117 is an electromagnet, which connects the amplifier circuit 116 and the power switch 10.
2 and the (10) poles of the power supply battery 101.

118 is an amplifier circuit whose non-inverting input terminal + is connected to the output terminal 106d of the reference voltage circuit 106, and whose output terminal is connected to the non-inverting input terminal 10 of the amplifier circuit 104.

A variable resistor 119 is connected between the output of the amplifier circuit 118 and the inverting input terminal.

120 is a resistor, one end of which is connected to the connection point between the inverting input terminal of the amplifier circuit 118 and the variable resistor 119, and the other end of which is grounded.

Next, the operation of this embodiment will be explained using the shirt starter mechanism shown in FIGS. 1 to 9 and the shirt starter control circuit shown in FIG. 18.

First, the warning operation will be described. When the spring plate 2 is pushed down against the tension of the spring 3, the power switch 102 is closed by the displacement of the pin 2d, and voltage is supplied to each part of the circuit. At this time, the light receiving element 103
Since the exposure warning information introduction opening 14e is irradiated with field light, a photocurrent i is generated and amplified by the amplifier circuit 104. In the amplifier circuit 104, a logarithmic compression diode 105 is connected between the output terminal and the inverting input terminal 1 and feedback is applied, so a compression voltage proportional to the logarithm of the photocurrent i is generated at the output terminal. This voltage is applied to the inverting input terminal 107a of the window comparator 107. In this case, if this voltage is higher than the high-intensity warning reference voltage applied from the output terminal 106a of the reference voltage circuit 106 to the non-inverting input terminal +107b, the LEDI connected to the output terminal 107d
08 lights up, and if it is lower than the low brightness warning reference voltage applied from the output terminal 106b to the non-inverting input terminal 107c, the LE connected to the output terminal 107e
If only DIO9 is lit and proper exposure between both reference voltages is possible, neither LEDI08 nor LED109 is lit. Note that the low brightness warning operation signal is inverted inside the window comparator 107. Next, let's talk about automatic shooting.

In this case, the switch switch 111 is connected to the terminal 111a by a switching unit for automatic photography and flash photography (not shown).
The flash Sekiguchi lever 22 also remains in the position shown in FIG.
It deviates from the trajectory of motion. Note that this cut≠back mechanism can also be made to be linked to the operation of attaching the flash device to the camera or the operation of hopping up the flash device from the camera. First, the switch 114 is closed and the inverting input terminal 1 of the comparator 115 is raised to the (10) pole level of the power supply battery 101, and as a result, the output terminal is placed at the "L" level, so the electromagnet 117 has been energized since its closure. Therefore, the iron piece bar 15 is held in the state shown in FIG. 1 by the iron piece 17 being attracted to the electromagnet 117. If the release lever 2 is pushed down further from the warning operation stage, the bending 2c
is removed from the bend 6c of the leaf spring member 6. As a result, the closing drive plate 4 carrying the leaf spring section 6 moves to the right due to the tension of the spring 5. As shown in FIG. 2, the closing drive plate 4 is temporarily stopped when the arm 4c is in contact with the bend 15a of the shingle bar 15, but in the process up to that point, the slope 4e pushes the pin 19a. Then, the hold lever 19 is rotated to the left while resisting the tension of the spring 20 to charge the iron piece spring 21. Further, the bending 6c of the leaf spring member 6 comes within the return locus of the bending 2c of the release lever 2 to prevent the release lever 2 from returning, thereby maintaining the closed state of the power switch 102. On the other hand, the bend 6d pushes the bend 7a' to rotate the shirt release lever 7 to the left against the tension of the spring 9. By turning the lever 7 to the left, the arm 7c becomes the arm 10a.
The opening/closing lever 10' is rotated to the left by the tension of the spring 13, and the pins 10d and 10e release the shutter blade 1.
4 to the right (other shutter blades not shown are to the left), and by displacing pin 10f, switch 1
Open 14. As the shutter blade 14 moves, the opening 14e first displaces and once blocks the light receiving window 1b, and since the switch 114 is already open at this point, the capacitor 110 is caused by a current corresponding to the current in the light receiving element 103.
Charging will begin. Further, the exposure information introducing entrance 14f first starts opening the light receiving window lb, and a little later the shutter opening 14d opens the exposure closing opening la. child)
, due to the charging of the capacitor 10 due to the floor current and the preceding opening of the light-receiving window lb. The so-called mechanical delay is corrected. Then, in response to the increase in Sekiguchi 14f that moves in response to the increase in Shitsuta Sekiguchi 14d, the light irradiating the light receiving element 103 gradually increases, and a current proportional to the photocurrent flows through the transistor 1.
12, the capacitor 11 is further charged, and the potential at the inverting input terminal 1 of the comparator 115 gradually decreases. In this case, when the field light is doubled, the photocurrent is doubled, and when the field light is quadrupled, the photocurrent is quadrupled, so the so-called gamma characteristic is "1". When an element is used, the collector current of the transistor 112 is proportional to the photocurrent, so charging the capacitor 11 means integrating the amount of light. Furthermore, since the gates 4d and 14f are formed on the same member and have similar shapes, it can be said that the integrated amount of photocurrent and the amount of exposure on the bride surface are in direct proportion. Therefore, if a constant potential is applied to the non-inverting input terminal 10 of the comparator 115 from the output terminal 106c of the reference voltage circuit 106, this potential will provide a reference for a constant image plane exposure amount, and the integral of the photocurrent will be The amount of exposure can be controlled by comparing it with the potential corresponding to the amount. Then, as the capacitor 110 is charged,
When the potential of the inverting input terminal - becomes lower than the potential of the non-inverting input terminal +, the comparator 115 is inverted and the output terminal becomes "H" level, so that the electromagnet 117 is demagnetized.
As a result, the iron piece lever 15 is activated by the charged iron piece spring 2.
1, rotate to the left and remove the bend 15a from the arm 4c. Therefore, the closing drive lever 4 is further moved to the right by the tension of the spring 5, as shown in FIG. By this movement to the right, the arm 4d first contacts the conductive ring 12 and rotates the opening/closing lever 10 to the right against the tension of the spring 13, and from the middle, the conductive ring 1
Instead of 2, the opening/closing lever 10 is engaged with the non-conductive protrusion 10c to rotate the opening/closing lever 10 to the right to the final range. Therefore, the shirt blade 1
4 closes the exposure aperture la during the opening of the exposure aperture la by the aperture 14d or from the fully open state, corresponding to the timing when the conductive ring 12 is pushed by the arm 4d according to the field light. Further, since the switch 114 is pushed by the pin 10f and closed, the charge in the capacitor 110 is discharged. Furthermore, since the bending 6c of the leaf spring member 6 is removed from the bending 2c,
The release lever 2 returns upward due to the tension of the spring 3 and opens the power switch 102 via the pin 2d. on the other hand,
Since the bend 6d is removed from the bend 7a', the shirt release lever 7 rotates to the right due to the tension of the spring 9 until the arm 7a abuts the pin lf, and the arm 7c releases the arm 10a of the opening/closing lever 10.
Facing within the left rotation trajectory of. The shirt closing mechanism is set by moving the closing drive plate 4 to the left against the tension of the spring 5. That is, during this leftward movement process, the leaf spring member 6 moves along the slope 6c' of the bend 6c, as shown in FIG.
to get over the bend 2c of the release lever 2, and then move the other bend 6
Bending 7a of the shirt release lever 7 at the slope 6d' of d.
', returns after overrun, and bend 6c engages bend 2c. On the other hand, as the closing drive plate 4 returns, the flat surface 4f and the slope 4e are removed from the pin 19a, so the hold lever 19 is moved by the tension of the spring 20 to the iron piece and the bar 15.
The arm 4 c rotates to the right, and the bend 15 a comes into the movement trajectory of the arm 4 c, and the iron piece 17 supports the electromagnet 117 . As a result, all the members return to the pillow state shown in FIG. Next, let's talk about flash photography.

By imitating the flash photography, the off switch 1
11 is connected to the terminal 111b, that is, the transistor 11
The flash Sekiguchi lever 22 is connected to the resistor 113 instead of the pin 22b, and the flash Sekiguchi lever 22 is operated in conjunction with the distance adjustment via the pin 22b, and the spring 24 is connected in accordance with the amount of adjustment.
is rotated to the left against the tension of Assuming that the flash Sekiguchi lever 22 is anchored to the left as shown in FIG. 5 by the distance adjustment described above, the opening/closing lever 10 is rotated to the left by the shirt release operation described above until the pin 10g contacts the cam surface 22a. Then, open the shirt blade 14 □1
4d, the exposure closure la is opened to a size corresponding to the distance. When the electromagnet 117 is demagnetized after a certain period of time by the capacitor 110 and the resistor 113, the closing drive plate 4 moves to the right and the shutter blade 14 closes the exposed entrance la, as described above. Further, as shown in FIG. 6, the synchro switch is closed by the arm 4d, which starts this closing operation, being applied to the conductive ring 12, and the flash device emits light at its maximum point. In addition, the third
As shown in the figure, at the final point of the closing operation, the arm 4d is separated from the conductive ring 12 and engages the non-conductive protrusion 10c, so that the flash device does not erroneously emit light. In FIG. 7, the light emission timing of the flash device is changed to the time when the opening/closing lever 10 touches the flash Sekiguchi lever 22.

That is, in the opening/closing lever 10, the pin 10b is removed,
The conductive ring 12' is aligned with the pin 10g, one end of the spring 13 is hung on the conductive ring 12, and the flash opening lever 22 is made a conductive member, and the cam surface 22a and the conductive ring 12 are connected to each other.
′ constitutes a synchronized switch.
Moreover, FIGS. 8 and 9 show changes to a flash photography mechanism that allows synchronized photography during the day.

That is, in the opening/closing lever 10', a conductive ring 12' is also iron-coupled to the pin 10g, and a spring 13' serving as a lead wire is also hung between the conductive ring 12' and the pin lj. Then, a synchro switch formed by the conductive ring 12 and the arm 4d and a synchro switch formed by the conductive ring 12' and the cam surface 22a are connected in parallel, the resistor 113 is not provided, and the exposure time is determined by the light receiving element 103 according to the field light. It is automatically controlled. Therefore, the closing amount determined by the distance adjustment is 4.0 times larger than the closing amount determined by the field light, and in this case, as shown in FIG. Upon contact, the flash device fires, and the exposure time is determined by natural light and the flash device's auxiliary light. In the opposite case, as shown in FIG.
The flash device emits light by the contact of the arm 4d with the conductive ring 12 before it contacts the cam surface 22a. In this way, the shirt opening gives priority to small apertures in response to distance adjustment from field light. Although FIG. 6 has been described as showing the operating state after FIG. 5, the arm 4d and the conductive ring 1
Daytime synchronized photography is also possible with a camera equipped with a pair of synchronized switches.

In this explanation, FIG. 5 shows the state at the time when the shutter opening is determined according to the distance, and FIG. 6 shows the state when the shutter opening is determined according to the field light. . In this case, the flash device emits light at the time when the shutter blades 14 begin to close, but the small aperture is still prioritized. Further, the amount of displacement of the flash Sekiguchi lever 22 may be controlled by composite information of guide number information and/or film sensitivity information in addition to distance information. Furthermore, the first
In the control circuit shown in FIG. 8, when the variable resistor 119 is changed, the potential of the non-inverting input terminal + of the amplifier circuit 104 is changed, and the pressure at the output terminal can be shifted. Therefore, the variable resistor 119 controls the film sensitivity and/or F.
Information such as values can be introduced electrically. Next, with reference to FIG. 19, a shutter control circuit incorporating a circuit that prevents warning display and a long time limit circuit will be described.

121 is a comparator whose non-inverting input terminal + is connected to the output terminal of the amplifier circuit 104, and whose non-inverting input terminal + is connected to the output terminal 106e of the reference voltage circuit 106.

122, 123, and 124 are capacitors, resistors, and inverters that constitute a differential circuit; one end of the capacitor 122 is connected to the output terminal of the comparator 121;
One end of 3 is connected to the power source battery 101 via the power switch 102.
is connected to the (ten) poles of. 125 is a latch circuit using a circuit such as a flip-flop, the set input state S is connected to the output terminal of the inverter 124 in the differentiating circuit, and the inverting output terminal Q is connected to the window comparator 107.
is connected to the gate input terminal G107f of.

126 and 127 are capacitors and resistors that constitute a delay circuit for long-time sand control; one end of the capacitor 126 is connected to the (10) pole of the lightning source battery 101 via the power switch 102, and one end of the resistor 127 is grounded. has been done.

128 is a transistor connected in parallel to the capacitor 126, the base of which is connected to the non-inverting output terminal Q of the latch circuit 1-25.
It is connected to the.

129 is a comparator whose inverting input terminal 1 is connected to the connection point between the capacitor 126 and the resistor 127, and whose non-inverting input terminal + is connected to the output terminal 106f of the reference voltage circuit 106.

130 is an OR gate, one input terminal a is connected to the output terminal of the comparator 129, the other input terminal b is connected to the output terminal of the comparator 115, and the output terminal is connected to the electromagnets 1 to 17 via the amplifier circuit 1 to 16. connected to one end.

Next, the operation of this embodiment will be described.

Immediately before the above-mentioned opening operation of the shutter blade 14, the light receiving element 1
03 is temporarily shielded from field light. This state is the same as a low brightness warning, and in the shutter control circuit shown in Figure 18,
The LEDIO 9 lights up to display the error, but in the circuit of this embodiment, when the output voltage of the amplifier circuit 104 reaches a voltage corresponding to the floor current in the dark state, the comparator 12
Since the potential of the non-inverting input terminal + of the reference voltage circuit 106 becomes lower than the potential of the inverting input terminal - given by the output terminal 106e of the reference voltage circuit 106, the comparator 121 changes the output terminal from the "H" level to the "L" level. Flip to level. This inversion generates a negative pulse at the connection point between the capacitor 22 and the resistor 123 in the differentiating circuit, and as a result, a positive pulse is generated at the output terminal of the inverter 124, setting the latch circuit 125 and inverting the output terminal Q. is inverted from "H" level to "L" level. And this "L"
Since the level signal is given to the gate input terminal G of the window comparator 107, the window comparator 10
Both output terminals 107d and 107e of LEDs 08 and 107 are placed at the "H" level, and therefore LEDIs 08 and 109 cannot be lit. On the other hand, when the non-inverting input terminal + is inverted to the "H" level by setting the latch circuit 125, the transistor 128 is cut off, so the capacitor 126 is connected to the resistor 12.
It is charged according to the value of 7. In the initial state, the output terminals of comparators 115 and 129 are both at "L" level, and the output terminal of OR gate 130 is at "L" level, so electromagnet 117 is excited, but transistor 128 is cut off and Switch 1 according to the above operation
When the output terminal of one of the comparators 115 or 129 is inverted to the "H" level due to the opening of the gate 14, the output terminal of the OR gate 130 is inverted to the "H" level.
The electromagnet 117 is demagnetized, at which point the shirt blade 14
will be closed. That is, the maximum exposure time is regulated by the delay time caused by the capacitor 126 and the resistor 127, and the maximum time is set to, for example, 10 seconds, or to 1/30 seconds, 1/19 seconds, etc. to prevent camera shake. It is more effective to use a variable resistor or a switching resistor as the resistor 127. And the longest time is 1/3
If it is set to 1/15 seconds, etc., it can be used as a shutter control circuit even during flash photography. Next, with reference to FIG. 20, a shutter control circuit in which the start of exposure time measurement is also electrically controlled will be described.

131 and 132 are a capacitor and a variable resistor that constitute the delay circuit for adjustment, one end of the capacitor 131 is connected to the (10) pole of the power battery 101 via the power switch 102, and one end of the variable resistor 132 is grounded. ing.

A transistor 133 is connected in parallel to the capacitor 131, and its base is connected to the non-inverting output terminal Q of the latch circuit 125.

A comparator 134 has a non-inverting input terminal + connected to a connection point between the capacitor 131 and the variable resistor 132, and a non-inverting input terminal + connected to the output terminal 106g of the reference voltage circuit 106.

A transistor 135 is connected in parallel with the capacitor 10' in place of the switch 114, and its base is connected to the output terminal of the comparator 134 together with the base of the transistor 128.

136 is a variable resistor, one end of which is connected to an input terminal 106h capable of adjusting the voltage of the output terminal 106g of the reference voltage circuit 106, and the other end is grounded.

In the initial state, the non-inverting output terminal Q of the latch circuit 125 is at the "Lj level" and the transistor 133 is conductive.
The output terminal is at the "H" level, the output terminal is placed at the "L" level, and the transistors 128 and 135 are both conductive. As described above, when the latch circuit 125 is set and the non-inverting output terminal Q is inverted to the "H" level, the transistor 133 is cut off, so that the capacitor 131 starts charging according to the value of the variable resistor 132. Then, the potential of the inverting input terminal - becomes the output terminal 1 of the reference voltage circuit 106.
When the potential becomes lower than the potential of the non-inverting input terminal + given by 06g, the comparator 134 is inverted and the output terminal becomes "H" level. As a result, transistor 1
28 and 135 are shut off, and the measurement of the maximum time regulation and exposure time control delay circuits is started, and the subsequent operation is the same as that of the shutter control circuit shown in FIG. 19 described above. Therefore, by setting the variable resistor 132, the comparator 134
By changing the time it takes for the shutter blade to reverse, it is possible to adjust the measurement start timing of the delay circuit for controlling the exposure time in accordance with the relationship between the opening of the shutter blade and the closing timing of the shutter blade, which has a mechanical delay. Can be easily adjusted. In addition, the variable resistor 132 connected to the inverting input terminal of the comparator 134 is fixed, and the reference voltage circuit 10
Similar adjustment can be made by varying the reference voltage of the non-inverting input terminal + of the comparator 134 by varying the variable resistor 136 of No. 6. Next, the shutter mechanism including the self-timer control element will be described with reference to FIGS. 10 to 13, and its shutter control circuit will be described with reference to FIG. 21.

The closing drive plate 4 further forms a hook 4h and has a pin 4i mounted thereon. The iron bar 15 has a bend 15d instead of the pin 15c, and the bend 15d engages the arm 19b of the hold lever 19 on one side. 25 is a timer lever pivotally connected to the shaft 16, and has an arm 15b that engages with the other side of the bend 25a and bend 15d that can be engaged with the hook 4h.
A spring 26, which is somewhat stronger than the spring 20, provides levorotation.

As a result, in the initial state, even if the iron bar 15 is rotated to the left and the electromagnet 117 is excited, the iron piece 17
is not attracted and is separated from the electromagnet 117.
The electromagnet 117 has one end connected to the output terminal 11 of the comparator 115 via a resistor 137 instead of the amplifier circuit 116.
5a. Therefore, simply switch the power switch 10
2 is closed, the current flowing through the electromagnet 117 is limited by the resistor 137, so it is very small, and its excitation force is weak. 138 and 139 are resistors and capacitors that constitute a delay circuit for the self-timer, and one end of the resistor 138 is connected to the power supply battery 1 through the power switch 102.
01, and one end of the capacitor 139 is grounded.

140 is a switch for starting measurement of the delay circuit;
It is connected in parallel to the capacitor 139 and is provided opposite to the pin 4i of the closing drive plate 4.

Reference numerals 141 and 142 indicate a self-timer set/reset switch and a resistor having an extremely small value, the series circuit of which is connected in parallel to the resistor 138.

A comparator 143 has an inverting input terminal 1 connected to the output terminal 106i of the reference voltage circuit 106, and a non-inverting input terminal + connected to the connection point between the resistor 138 and the capacitor 139.

144, 145, and 146 are capacitors, resistors, and inverters that constitute a differential circuit, one end of the capacitor 144 is connected to the output terminal 143a of the comparator 143,
One end of resistor 145 is grounded.

148 is a current amplification circuit, the input terminal of which is the inverter 146
The output terminal is connected to one end of the electromagnet 117.

149 is a NAND gate whose input terminals are non-inverting output terminals 115b and 143 of comparators 115 and 143, respectively.
connected to b.

150, 151, and 152 are capacitors, resistors, and inverters that constitute a differential circuit; one end of the capacitor 150 is connected to the output terminal of the NAND gate 149;
Power source battery 101 via power switch 102 at one end of 1
is connected to the (ten) poles of.

153 is an SCR whose gate is connected to the output terminal of the inverter 52 and grounded via a resistor 154, and whose cathode is grounded.

155 is the electroflash trigger circuit, SC
It is connected between the anode and cathode of R153.

Next, the operation of this embodiment will be explained. In the case of self-timer photography, for example, the dial is set to the self-timer position and the switch 141 is opened.

The closing drive plate 4 moves to the right with the operation of the release lever 2, but as shown in FIG. And it will be stopped. The switch 140 is opened by the displacement of the pin 4i as the closing drive plate 4 moves, and charging of the capacitor 139 via the resistor 138 is started. Further, in this state, if the release lever 2 is prevented from returning, the power switch 102 is held in the closed state.
As the capacitor 139 is charged, the comparator 143 detects that the potential of the non-inverting input terminal 10 reaches the reference voltage circuit 10, for example, after 1 peak as a self-timer operation.
The output terminal 143a becomes higher than the potential of the inverting input terminal - applied from the output Satoko 106i of No. 6 and is inverted, and the output terminal 143a becomes "H" level. As a result, a positive differential pulse is generated at the connection point between the capacitor 144 and the resistor 145 in the differential circuit, and therefore a negative pulse is applied to one end of the electromagnet 117 via the current amplification circuit 148, and the electromagnet 117 At this time, a large current was instantaneously passed, and the magnetic force increased and attracted the iron piece 17, causing the iron piece bar 15 and timer lever 25 to move against the tension of the spring 26. Rotate to the right. Note that after this suction operation, the electromagnet 11
7, the pulse disappears and the passing fin becomes a minute current again, but the iron piece 17 can be held by suction. Thereafter, the opening/closing operation of the shutter blade 14 is performed through the steps shown in FIGS. 12 and 13, which are similar to those shown in FIGS. 2 and 3 described above. Further, during normal photographing without using the self-timer, the switch 141 is closed, and a resistor 142 with a small value is connected in parallel to the resistor 138, so that the combined resistance is small.

Therefore, the delay time is extremely short, and the shutter opening/closing operation is performed virtually immediately. Note that the delay time is 0
However, by allowing a certain amount of time, the operation of the mirror and/or automatic diaphragm mechanism will be settled when applied to a single-lens reflex camera, or when adapted to a camera equipped with an automatic focus adjustment mechanism. There is an effect that can be used to absorb the adjustment mechanism's adjustment mechanism. Furthermore,
This shutter mechanism also has the same arm 4d of the closing drive plate 4 as described above.
A synchro switch is constituted by the conductive groove 12 on the opening/closing lever 10, and an electric synchro switch is also incorporated in this shutter control circuit.

That is, when the comparator 143 is inverted at the end of the self-timer operation, one input terminal of the NAND gate 149 becomes "H" level by the non-inverting output terminal 143b, and the NAND gate 149 enters a standby state to close the gate, thereby closing the shutter blade. If the comparator 115 is inverted at this point,
The other input terminal is also set to “H” by the non-inverting output terminal 1150.
" level, and as a result, the gate is closed and the output terminal becomes "L" level. Therefore, the SCR 153 becomes conductive when a positive differential pulse is applied to the gate by the differential circuit, and the trigger circuit 155 is driven in accordance with the maximum entrance point of the shutter blade 14 at that time to emit electroflash. Further, as one input signal of the NAND gate 149, the comparator 1 as in this embodiment
In addition to using the signal of the output terminal 143b of 43,
By using the latch circuit 125 as shown in FIG. 19 and providing it with another non-inverting output terminal, a signal corresponding to the shutter open timing may be used.

FIG. 22 shows a shutter control circuit that incorporates a circuit that prevents the display of a warning in the same manner as in FIG. 19 in the circuit shown in FIG. Inverted output terminal 14
3c.

Therefore, when self-timer photography is performed under brightness conditions where LEDI08 or 109 lights up, turning off LEDI08 or 109 indicates the transition from the end of self-timer operation to shirt release. It also happens.

Furthermore, in FIG. 23, a battery check circuit is constructed using a low brightness warning circuit, and 156 and 157 are resistors forming a voltage dividing circuit, and the output terminal 106b of the reference voltage circuit 106 is used as a low brightness warning standard. A circuit that provides voltage is simply shown. 158 and 159 are resistors forming a voltage dividing circuit, which detect a voltage drop in the power supply battery 101.

160 and 161 are constant current circuits and constant voltage diodes, which set check levels.

162 is a comparator, and the inverting input terminal - is the resistor 158
and 159, and its non-inverting input terminal + is connected to the connection point between constant current circuit 160 and constant voltage diode 161.

163 is a transistor whose base is the comparator 162
The collector and emitter are connected to the output terminal of the resistor 15.
7 are connected in parallel.

If the voltage of the power battery 101 is equal to or higher than the check level,
Since the potential of the inverting input terminal 1 of the comparator 162 is higher, the output terminal is at "L" level and the transistor 1
63 is in a cut-off state. Therefore, the battery check circuit portion is placed in a state that is irrelevant to the low brightness warning circuit. On the other hand, when the voltage of the power supply battery 101 falls below the check level, the output of the comparator 162 becomes "H".
level, making transistor 163 conductive.
As a result, the non-inverting input terminal + of the window comparator 107 becomes the potential of the (first) pole of the power supply battery 101, the output terminal 107e becomes "H" level, and the LED 109 becomes able to light up. Therefore, when the power switch 102 is closed and the light irradiated to the light receiving element 103 is blocked, the LE
If DIO 9 lights up, it means that the voltage of power supply battery 101 is above the check level, and if it does not light up, it means that it is below the check level. Next, a self-timer mechanism in which the self-timer mechanism is reset after one exposure operation will be described with reference to FIGS. 14 and 15.

The shirt flap plate 1 is further provided with a pin lk, and the timer lever 25 is further formed with a protrusion 25c.
27 is a timer set lever pivotally connected to the shaft 28, which includes a pin 27a for opening and closing the switch 141 and a set pin 2.
7b is provided as a shield to form a long groove 27c.

29 is a timer reset lever pivotally attached to the shaft 30;
A pin 29 that fits into the long groove 27c and can push the protrusion 25c.
At the same time as bending the iron bar 15 15d
An arm 29b that can be engaged with the back of the spring 26 (
The arm 29b is attached to the pin 1 by the spring 31 which is stronger than the spring 31 (not shown).
Right rotation is given until M contacts.

FIG. 14 shows the setting state of the self-timer. In order to end the self-timer operation, the iron piece 17 is attracted to the electromagnet 117 and the iron piece lever 15 is rotated to the right.
5d is detached from the arm 29b, the reset lever 29 is rotated to the right by the tension of the spring 31, and the pin 29a causes the timer set lever 27 to be rotated to the left. 26 (not shown) to the right. As a result, the 15th
The pin 27a is retracted and the switch 141 is in the sleep state as shown in the figure.
is closed, and the bending 25a of the timer lever 25 is held at a position away from the locus of movement of the hook 4h of the closing drive plate 4. The self-timer mechanism is set by rotating the timer set lever 27 to the right from the state shown in FIG. 15 by operating the pin 27b by a setting member (not shown).

That is, the reset lever 29 is the timer set lever 27.
When the arm 29b is rotated to the left against the tension of the spring 31 by the right rotation of the arm 29b, the back of the arm 29b engages the side surface of the bend 15d, and the arm 29b overcomes the bend 15d while rotating the iron piece lever 15 to the left. The set is completed when the state is reached. Note that when this reset mechanism is installed, the iron bar 15
When the timer lever 25 is attracted to the electromagnet 117, the load for turning the timer lever 25 to the right is reduced, so that the attraction operation becomes more reliable. Further, in this embodiment, exposure time control and self-timer control are performed using one fin magnet, but separate electromagnets may be used.

Next, with reference to FIGS. 16 and 17, a description will be given of the leak lock mechanism when the voltage of the power supply battery 101 is or has become less than a specified value.

The shirt plate 1 further has a bend 11 as a stopper.
is formed, and the release lever 2 is further formed with a bend 2e. Reference numeral 32 designates a release lock lever pivotally attached to a shaft 33, which forms an arm 32a that can abut the bend 11 and face within the locus of movement of the bend 2e, and a bend 32b that is related to the electromagnet 117; 32b' engages one end of the yoke 117b of the electromagnet 117, and the vertically bent portion 32b'' faces the side surface of the iron core 117a, and a weak spring 34 provides dextrorotation.

Next, the operation of this embodiment will be explained.

When the release lever 2 is pushed down, the bus switch 102 is closed as described above, and voltage is supplied to each part of the circuit.

In the initial state, switch 114 is closed, so that current flows through resistor 137 to magnetize electromagnet 117 as shown in FIG. At this time, the magnetic flux generated in the electromagnet 117 is small because the magnetic force is weak, and therefore it does not attract the iron piece 17. On the other hand, release lock lever 3
2 constitutes a magnetic circuit for the electromagnet 1 17 by the bend 32b, the vertical bend 32b'', the iron core 1 17a, the yoke 1 17b, and the base 32b', and the electromotive force that can overcome the weak spring 34 is generated by the electromagnet 1 17. Therefore, by testing whether the current is capable of providing a magnetomotive force of r greater than a certain value, it is possible to determine whether or not the power supply battery 101 is usable. , the verification level common to the entire shirtter control circuit can be appropriately set by adjusting the resistor 137.
When the voltage of the power supply battery 101 is sufficient and a current exceeding the certification level flows through the electromagnet 117, the lock lever 32 moves to the left as shown in FIG. 16, and the arm 32a bends to the position 2e.
The lever 2 can be pushed down further. Also, if the current flowing through the electromagnet 117 is below the certification level, the lock lever 3
As shown in FIG. 7, the arm 32a remains in contact with the bend 11, and the arm 32a remains within the locus of movement of the bend 2e, preventing the release lever 2 from being pressed down.
Furthermore, the vertically bent portion 3 of the iron core 117a in the electromagnet 117
If the non-magnetic part 1 17a' is provided in the part facing 2b'', an air gap will be created in the magnetic circuit and the magnetic flux passing through the magnetic path will be reduced, so that the magnetic flux that attracts the iron piece 17 will be reduced later. Furthermore, if the output terminal 107e of the window comparator 107 is also connected to the side of the resistor 137 that is connected to the output terminal 115a of the comparator 115, it is possible to prevent the leak lock from occurring at the time of low brightness warning. can.

Further, the release lock lever 32 is connected to the release lever 2.
It is also possible to pivot the shutter lock lever 32 upward, and in this case, depending on whether or not the shutter lock lever 32 is attracted to the electromagnet 117, a part of the shutter lock lever 32 engages with a fixed member (not shown). It can become unlocked or can be locked. In this case, when the release lock lever 32 is attracted by the electromagnet 117, the vertically bent portion 32b'' is moved as the release lever 2 is pressed down.
moves so as to slide on the iron core 117a, but if it is made to eventually face the non-magnetic material portion 117a', the same effect as described above can be obtained. Furthermore, in a camera with a built-in flash device, when the power supply for the shutter control circuit is also used to charge the main capacitor of the flash device, the release lock mechanism can also be used when the voltage drops during charging. Performs the same operation as .

As described above, according to the time control circuit of the present invention, the measurement start of the exposure time control circuit can be started without using a mechanical switch, and in response to the light amount attenuation caused by the blocking of the light receiving window in the pre-stage of the exposure time control circuit. Since it is controlled by electrical signals, stable operation can be obtained.

In addition, conventionally, the measurement start control was performed by operating a mechanical switch using a shutter mechanism, so the switch operation becomes a load on either the opening or closing operation.
In particular, the actuation force is 4.5 mm, which is a factor that makes the operation unstable, but the present invention also eliminates one of the factors that make the operation unstable. be.

[Brief explanation of drawings]

Figure 1 shows the shirt shutter mechanism including the shutter closure control element for flash photography in a set state, Figure 2 shows the shirt flap in the closing state, and Figure 3 shows the shirt flap in the closed state. FIG. 4 is a bottom view showing the relationship between the closing drive plate and the leaf spring member, FIGS. 5 to 9 are views showing the shutter shutter control state during flash photography, and FIG.
The figure shows the shutter release mechanism including the self-timer control element in the set state, Figure 11 shows the self-timer when it is activated, Figure 12 shows the shutter release mechanism in the shutter release state, and Figure 13 shows the shutter release mechanism in the set state. Diagram showing the closed state of the shirt cover, No. 14
15 and 15 show the relationship between setting and resetting the self-timer mechanism, FIGS. 16 and 17 show the shutter lock mechanism, and FIGS. 18 to 22 show the shutter control circuit, respectively. 23 are circuit diagrams showing an example of a battery chuck circuit. 1...Shaft plate, la...Exposed mouth, lb...
...Light receiving window, 2... Lease lever, 4...
...Closing drive plate, 4c, 4d...Arm, 4h...
...Hook, 6...Plate spring member, 7...
... Shirt release lever, 10... Opening/closing lever, 12, 12'... Conductive ring, 14... Shirt shutter blade, 14d... Shaft shutter Sekiguchi, 14e.
......Closing for introducing exposure warning information, 14f...Sekiguchi for introducing exposure information conductivity, 15......Silver bar,! 7...
... Iron piece, 19 ... Hold lever, 22 ... Flash opening lever, 22a ... Cam surface, 25 ... Timer lever, 27 ... Timer set / 1, 2
9"""Timer reset lever, 32...Release lock lever, 101...Power battery, 102...
...Power switch, 103... Light receiving element, 10
5... Logarithmic compression diode, 106...
・Reference voltage circuit, 107...Window controller, 1 0 8, 1 0 9...LED, 1 1 5
, 121, 129, 134, 143, 162... Comparator, 104, 116, 118, 148...
Amplifier circuit, 125...Latch circuit, 117...
...Electromagnet, "122, 123, 1241" 144
, 145, 146'', ``150, 151, 152''...
... Capacitor, resistor, inverter, 110, 126, 131, 139, which constitutes the differential circuit... Capacitor, 113, 120, 127, 137, 138, 142,
154,156,157,158,159...Resistance, 119,132...Variable resistor, 112...
...logarithmic expansion transistor, 128, 133, 135
, 163...transistor, 160...constant current circuit, 161...constant voltage diode, 111...
...Choice switch, 114, 141...Switch. Figure 4 Figure 5 Figure 6 Figure 1 Figure 10 Figure 2 Figure 3 Figure 7 Figure 8 Figure 9 Figure 14 Figure 11 Figure 12 Figure 13 Figure 23 Figure 15 Figure 16 Figure 17 Figure 18 〇 Ship diagram e Ship diagram N Ship map S Ship

Claims (1)

[Scope of Claims] 1. A shutter blade that also serves as an aperture blade for controlling opening and closing of an exposure aperture, a light-receiving diaphragm that is operatively interlocked with the shutter blade to control the amount of light received by a light-receiving element, and the light-receiving element. an automatic exposure time control circuit that controls the closing timing of the shutter blade depending on field brightness,
The light receiving element is exposed to field light in advance before the shutter release, and when the shutter blade opens the exposure aperture by the shutter release, the aperture diaphragm is activated. In the light-receiving diaphragm-linked programmable electric shutter, the shutter is once shielded from field light and then exposed to field light again, comprising: a discrimination circuit for determining the output level of the light-receiving element; and a memory circuit for storing a discrimination output state of the discrimination circuit, and in an operation in which the light receiving element is temporarily shielded from field light, the discrimination circuit determines a point in time when the output of the light receiving element decreases to a predetermined level or less. The automatic exposure time control circuit is characterized in that the automatic exposure time control circuit starts measurement based on the memory output of the memory circuit. 2. In order to control the closing timing of the shutter blades without depending on the brightness of the field, a maximum exposure time regulation circuit is provided that starts measurement based on the memory output of the memory circuit, and the closing timing of the shutter blades is adjusted according to the automatic exposure seconds. 2. The time control circuit according to claim 1, wherein the time control circuit is controlled by outputs generated before the time control circuit and the longest exposure time regulation circuit.