JPS60119528A - Control signal generator of camera - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to a control signal generator for a camera, and particularly to a camera in which the shutter blade also serves as an aperture blade, and shutter operation and aperture operation are performed simultaneously by opening and closing the shutter blade (a camera with a shutter that also serves as an aperture). , relates to something that generates a shutter blade opening/closing position signal.

In a camera with a shutter that also functions as an aperture, a photointerrupter consists of a light-emitting element and a light-receiving element placed opposite the signal-generating aperture provided in the shutter blade, and the blade position is detected using the photointerrupter. . In such a camera, when the shutter blade starts to move, the photo interrupter outputs the first signal and turns on the count switch for exposure control operation or the count switch for auto flash operation, as disclosed in Japanese Patent Laid-Open No. 58-463.
It is disclosed in Publication No. 28. The position of the shutter blade is detected using the second and subsequent aperture signals.

However, in the configuration of the photointerrupter disclosed in the same publication, the signal sources for the first signal and the second and subsequent signals are provided in the same shutter blade.
The time difference between the first signal and the second signal is self-limited. This situation will be explained while looking at Figure 1. The figure shows only the main parts near the shutter from the rear side of the camera's optical path, with the shutter closed. The first shutter blade L, which rotates around the shaft 3, and the second shutter blade 5, which rotates around the shaft 7, are as follows:
While partially overlapping, the open opening R (indicated by a dotted line) is completely closed. Since each of the shutter blades 1 and 5 also serves as an aperture blade, a substantially square-shaped aperture blade portion is formed. When they are rotated and opened in the X direction and the X' direction, a diaphragm aperture is formed by the square opening portions of both. Apertures 1a, ・la, ・1117@Φ・ for signal generation are provided near the outer edge of the rotation trajectory of the shutter blade 4f11, and a couple of a light emitting element and a light receiving element are provided at a position opposite to the movement trajectory X. 10 are arranged to form a photointerrupter.

In such a photointerrupter, the output change first occurs when the shutter blade ilb comes to the position of the couple 10, and becomes the first signal. Then, the aperture 1al is read and becomes the second signal.

The second and subsequent signals are signals corresponding to the aperture.

If the arrangement is as shown in the figure, the first signal will be output some time after the shutter blades start moving. By arranging the couple 10 close to the edge of the shutter blade, the first signal can be output as soon as the shutter blade begins to move.

However, if one attempts to increase the time difference between the first signal and the second and subsequent signals, which are the aperture position signals, due to control reasons, the distance from the edge of the shutter blade to the aperture 1aI must be made longer. As a result, the shutter blades also become large, which in turn increases the size of the entire camera.

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a small and compact signal generator that can freely set signal timing.

In order to achieve this object, the present invention regulates the aperture opening amount by the opening amount of at least two shutter blades, and detects the opening 11 provided in one of the shutter blades using a photointerrupter. In a camera control signal generator that detects a star when the shutter opens and uses it as a control signal, when the shutter is closed, the shutter blades other than the shutter blade provided with the opening are the light-emitting/light-receiving part of the photointerrupter. The control signal generator for a camera is characterized in that the photointerrupter closes the optical path facing the photointerrupter and closes the optical path when the shutter blade starts to open, and the photointerrupter generates a shutter opening start signal.

Examples of the present invention will be described in detail below.

FIG. 2 is a perspective view of an embodiment of an aperture and shutter equipped with a signal generator to which the present invention is applied. In the figure, an arrow line C indicates the optical axis of the photographing lens of the camera, and points in the direction of the subject (outward direction of the camera). 12 is Nyatta main plate, 13
1 is a rotor on which a printed coil (shown by chain lines) is mounted, the hole 13a of which is fitted into the dowel 12a of the main plate 12, and the rotor spring 16 is stretched between the main plate 12 and biased counterclockwise. Ru. 18 is an opening lever with a rotation center hole 18a
A dowel 12a is fitted in the dowel 12a, and an opening spring 19 is stretched between the dowel 12a and the base plate 12, and the dowel 12a is biased clockwise. A protruding pawl (not shown) is formed on the rotor 13 side of the opening lever 18, and the protruding pawl abuts against the edge 13b of the rotor 13. Since the rotor spring 16 is stronger than the opening spring 19, rotation in the clockwise direction is prevented. Magnets 21 and 22 are magnetized with opposite polarities with respect to the direction of the photographing optical axis C, and are fitted into the hole 12b of the base plate 12.

A front yoke 23 is fixed to the magnets 21 and 22. 24 is the rear yoke, magnets 21-22 and rotor 1
3 and are fixed to the base plate 12. front yoke 2
3. Magnets) 21 and 22 and the rear yoke 24 constitute a magnetic circuit, and the rotor 13 is placed in the magnetic circuit. When the printed coil of the rotor 13 is energized, the rotor 13 receives a clockwise driving force and rotates against the force of the rotor spring 16. 27 has a plate blade holder,
It is attached to the shutter base plate via spacers 25 and 26.

29 is a first shutter blade, 30 is a second shutter blade,
Both are also used as aperture blades.

A substantially V-shaped twin wing blade portion is formed. 30d is one of the twin blade portions of the second shutter blade 30. Dowels 27a of the plate 27 are located in the rotation center holes 29a*30a of each of the first shutter blade 29 and the second shutter blade 30.
- 27b fits.

In addition, the long holes 29b and 31 of each shutter blade 29-30)
b, a rotation locus long hole 27c, 2 made in the plate 27.
7d, and the pin 18 implanted in the opening/to-18.
c.18d is fitted. For this reason, the opening lever 18
When rotates clockwise, the two shutter blades 29 and 30
will open.

Signal holes 29C1, 29c2, 29 are arranged in the lower part of the first shutter blade 29 in the direction of its rotation locus (arrow X direction).
c3... is provided.

With shutter blades 29-30 closed (see Figure 3)
, one side 30d of the twin blade portions of the second shutter blade 30 is on the rotation locus X of the signal hole 29c, @29C2, 29c3, life.

Reference numeral 33 denotes a shutter blade holding plate, and a couple 35 consisting of a light emitting element and a light receiving element is disposed in an opening portion at a position facing one of the twin blades 30d when the shutter blade is closed. In the blade holder, an opening 27e is provided in the plate 27 at a position facing the couple 35, and a reflecting plate 38 is attached thereto. Therefore, blade 30d - signal hole 29cl e29c
2529c3.Φ. and the car 2 pull 35 form a photointerrupter.

In addition, the notch 30C at the edge of the second shutter blade 30 is a sub-diaphragm that connects the light guide 30 from the photometry lens (not shown) to the light guide 30C.
This is the aperture through which the exposure control metering light that has passed through the second
The amount of transmitted light 9 increases or decreases depending on the amount of rotation of the shutter blade 30. A photometric element 37 is disposed in the opening of the presser plate 33 at a position facing the light guide 32, and can measure the amount of light transmitted through the sub-diaphragm.

FIG. 4 is a block diagram of a circuit that controls the operation of a camera equipped with such an aperture/shutter. 50 is a circuit that colors the output of the photointerrupter 35 into a waveform. 5
9 is the AE circuit, of which the photometric element 37 is 5PC263
is a compression diode, 64 is an operational amplifier, 65 is an expansion transistor, 66 is a capacitor, and 67 is a capacitor 6.
6 is a transistor for discharging, 68 is a reference voltage source, 69
is a comparator. When the voltage of the capacitor 66 becomes higher than the voltage of the reference voltage source 58, the comparator 69 determines that exposure is appropriate, and the output of the comparator 69 changes from low to high and is output to the shutter closing control circuit 57 and the OR gate 60.

Reference numeral 51 denotes a counter that currents the pulses of the waveform shaping circuit 50. 53 is a circuit that calculates the appropriate aperture for flash photography, and the film sensitivity IS of the film sensitivity setting circuit 54.
The aperture is calculated based on the O value, the distance measurement value of the distance measurement circuit 56, and the guide number set by the tip of the strobe. 52 is a comparison calculation circuit, which compares the output of the counter 51 and the aperture calculation circuit 53.
compares the outputs of , and when they match, outputs high to (or game) 60. In the OR game) 60, a high level is outputted to the strobe trigger circuit 55 at the earlier timing of the AE completion signal of the AE circuit 59 or the output signal of the comparator circuit 52, and the strobe circuit 58 emits light.

Also, since the first pulse of the waveform shaping circuit 50 is the timing to start exposure, the output of the waveform shaping circuit 50 is input to the clock terminal of the D-type flip-flop 61, so that the output Q of the flip-flop 61 is It goes from low to high. Since the output Q is connected to the base of the count switch transistor 67 in the AE circuit 59, the transistor 67 changes from on to off by going from low to high, and the capacitor 66 is expanded from its discharged state by the transistor 65. The AE circuit 59 operates so as to start integrating the current and obtain proper exposure.

Such an aperture/shutter operates as follows.

FIG. 5 shows the output signal of the photointerrupter as the shutter blade opens. 3(a) shows the output waveform of the boot interrupter 35, and FIG. 2(b) shows the waveform when the output in FIG. The value v to which the output of the photo interrupter 35 is set
The waveform is shaped by the waveform shaping circuit 50 so that one pulse is generated when th is exceeded. S starts with the shutter blades closed. When a release button (not shown) is pressed, the coil of the rotor 13 is energized and the shutter blades begin to open. Then, the second shutter blade 30 rotates in the X direction, the blade 30d retreats from the optical path of the photointerrupter, and the first signal is output at the position A in the figure. On the other hand, the first shutter blade 29 also rotates in the X direction, and the signal hole 29cl *29c2 *29c3
m m- passes through the optical path of the photointerrupter, and the second and subsequent signals pass through the aperture f13.5. Eye 1. f9.5. ．． , depending on. f2.8 is the signal when fully opened.

When the #1 pulse is counted by the D-type flip-flop 61, a signal is input to the AE circuit 59, and the photometric element 3
7 starts photometry. Thereafter, when the light entering the photometric element 37 reaches a certain value, the rotor 13 is de-energized and rotated counterclockwise by the rotor spring 16.

Therefore, the edge 13b of the rotor 13 comes into contact with the protruding pawl of the opening lever 18 again, and the opening lever 18 rotates counterclockwise together with the rotor 13, closing the shutter blades 29 and 30 and completing the exposure.

As explained above, in the signal generator of the present invention, the signal source for the signal when the shutter blade starts to move and the signal source for the aperture signal are provided on different shutter blades, so even if the shutter blade is small, , each signal can be issued at the correct time.

[Brief explanation of the drawing]

Figure 1 is a front view of the main parts around the shutter with a conventional signal generator, Figure 2 is a perspective view of a shutter equipped with a signal generator to which the present invention is applied, and Figure 3 is the same around the shutter. Main part front view, Figure 4 is camera control block diagram, Figure 55!
J is a diagram explaining the timing of signals. 29 and 30 are shutter blades, 35 is a couple consisting of a light emitting element and a light receiving element, 38 is a reflecting plate, 29C3 and 29c,
・29c3... is the signal hole, and 30d is the east wing.

Claims (1)

[Claims] (1) The aperture opening amount is regulated by the opening amount of at least two shutter blades, and the opening provided in one of the shutter blades is detected by a photointerrupter to detect the shutter opening amount. , in the control signal generator of the camera that converts it into a control signal. When the shutter is closed, the opening r? The shutter blade other than the shutter blade provided with the part faces the light emitting/light receiving part of the photointerrupter and closes the optical path, and when the shutter starts to open, it opens the optical path and the photointerrupter closes the optical path. A camera control signal generator characterized in that it generates a shutter opening start signal.