JPS6320982Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a digitally controlled camera shutter;
More specifically, the present invention relates to a camera shutter that performs automatic exposure in a programmed manner by digitally selecting four types of fixed exposure.

In the past, many AE type electric shutters have been proposed as camera shutters that automatically control exposure, but all of them require a magnetic device to be turned on and off.
Since the timing of opening and closing the shutter blades was directly controlled by turning off the shutter, the exposure accuracy was likely to deteriorate due to the response delay of the magnet device and the mechanical delay, which resulted in a time-consuming adjustment. This was not desirable due to the disadvantage. Furthermore, adjustment that takes time and effort involves adjusting the trigger point that activates the exposure control circuit.

The present invention has been made in view of the drawbacks of the conventional electric shutter mentioned above, and an object of the present invention is to provide a digitally controlled camera shutter in which a magnetic device is not directly involved in controlling the opening and closing timing of the shutter blade. With the goal.

The purpose of the present invention is to selectively control the aperture diameter in three stages by turning on and off, and to lock the running of the trailing blade by both the first and second locking levers, or lock the rear blades by both the first and second locking levers, or lock the rear blades by the first and second locking levers. The first and second electromagnetic devices selectively control whether the rear blades are stopped from running only by the locking lever, and the first and second electromagnetic devices start running in conjunction with pressing down of the shutter button. a leading blade that releases the locking of the trailing blade by pressing the locking lever No. 2;
The rear blade starts running when the first locking lever is released or the second locking lever is also released, so that the second speed shutter is activated. This can be achieved by using a digitally controlled camera shutter that selects the following and obtains appropriate exposure by appropriately combining the aperture aperture and shutter speed according to the brightness of the subject.

Hereinafter, the present invention will be explained based on an illustrated embodiment.

In FIG. 1, which shows the shutter in its set state, numeral 1 denotes a lower substrate in which an aperture 1a (corresponding to F3.5) and a slot 1b are formed. 2 is the first
This electromagnet device is equipped with an iron core 2a and a coil 2b, and is fixed to a lower substrate 1. Reference numeral 5 designates an iron piece lever, which pivotally holds an iron piece 6, has a bent portion 5a formed therein, is pivotally supported by the lower substrate 1 via a shaft 7, and is rotated to the left by a spring (not shown). Although the force is applied, the iron piece 6 is held by adsorption to the iron core 2a and is restrained. 9 is the first aperture blade,
An opening 9a (corresponding to F7) and a hook portion 9b are formed, and the lower substrate 1 is rotatably supported via a shaft 10, and a left rotation force is applied by a spring (not shown). However, the hook portion 9b comes into contact with the bent portion 5a and is restrained. 12 is a second diaphragm blade, which has a pin 13 planted therein and a slit-shaped opening 12a.
(corresponding to F14), a hook portion 12b is formed, which is pivotally supported by the lower substrate 1 via the shaft 10, and is biased with left rotation force by a spring (not shown). The hook portion 12b abuts against the bent portion 5a and is restrained. 15 is a second electromagnet device, which includes an iron core 15a and a coil 15b, and is fixed to the upper substrate 3. Although only a portion of the upper substrate 3 is shown, in reality, like the lower substrate 1, it is on a disc and has an opening facing the aperture 1a. Reference numeral 17 is an iron piece lever, which pivotally holds the iron piece 18 and has a pin 19 planted therein;
An arm portion 17a is formed, is pivotally supported by the upper substrate 3 via a shaft 20, and is supported by a spring (not shown).
Although the left rotation force is applied by the iron piece 18, the iron piece 18 is held by suction to the iron core 15a and is suppressed.
Reference numeral 22 designates a second locking lever, which is formed with a hook portion 22a, is pivotally supported by the upper substrate 3 via the shaft 20, and is provided with right-handed rotation behavior by a spring (not shown). However, it comes into contact with the pin 19 and is restrained. 24 is a release lever, and surface 24a
is formed, and the lower substrate 1 is connected to the lower substrate 1 via the shaft 25.
A spring (not shown) imparts a left-handed rotational tendency, which is restrained by contact with a stopper 26. Reference numeral 28 denotes a leading blade, which has a pin 29 planted thereon and a slit forming surface 28a formed therein, is supported pivotally on the lower substrate 1 via a shaft 30, and is rotated to the right by a spring (not shown). Although the turning force is applied, the pin 29 comes into contact with the surface 24a and is restrained. Reference numeral 32 denotes a rear blade, which has a pin 33 planted thereon, a slit forming surface 32a formed thereon, and is pivotally supported by the lower substrate 1 via the shaft 30;
A right turning force is applied by a spring (not shown), but the pin 33 is restrained by coming into contact with the hook portions 22a, 35a. Reference numeral 35 designates a first locking lever, which is formed with a hook portion 35a and a protrusion portion 35b, is supported pivotally on the lower substrate 1 via the shaft 20, and is supported by a spring (not shown). Although dextrorotary behavior is imparted, the protrusion 35b comes into contact with the pin 29 and is restrained.

Next, the operation of the above configuration will be explained.

(i) When the first electromagnet device 2... is OFF and the second electromagnet device 15... is ON.

In this case, since the iron piece lever 5 rotates to the left, the engagement between the bent portion 5a and the hook portion 9b is released, and the first aperture blade 9, which is released from restraint, rotates to the left to open the aperture 1a. The second aperture blade 12 is an arm portion 17
It does not work because it is also inhibited by a.

Therefore, when the shutter button is pressed and the release lever 24 is rotated to the right, the disengaged leading blade 28 rotates to the right and begins to open the aperture 1a.
Furthermore, due to the right rotation of the leading blade 28, the pin 29 is attached to the protrusion 3.
5b and rotates the first locking lever 35 to the left to retract the hook portion 35a from the pin 33, but since the pin 33 is in contact with the hook portion 22a, the movement of the rear blade 32 is suppressed. After that, the leading blade 28
When the lever rotates clockwise to a position where the aperture 1a is fully opened, the pin 29 simultaneously pushes the second locking lever 22 and the first locking lever 35, causing each to rotate counterclockwise.
Due to this left rotation, the engagement between the hook portions 22a, 35a and the pin 33 is released, and the rear blade 3 is released from the restraint.
2 rotates to the right and covers aperture 1a. This completes one exposure, but the F value (Av) and T
The value (Tv) and Ev value are as shown in Fig. 3.

(ii) When the first electromagnet device 2...ON and the second electromagnet device 15...ON.

In this case, each member remains in the state shown in FIG.

Therefore, after the shutter button is pressed and the release lever 24 is turned to the right, the movements of the leading blade 28 and trailing blade 32 are as described in (i) above. F value (Av) at that time,
The T value (Tv) and Ev value are as shown in Fig. 3.

(iii) When the first electromagnet device 2 is ON and the second electromagnet device 15 is OFF.

In this case, the pin 19 causes the second locking lever 22 to rotate to the left as the iron piece lever 17 rotates to the left, and the hook portion 22a retreats from the pin 33. As a result, the pin 33 engages only with the hook portion 35a. Also,
By turning the iron piece lever 17 to the left, the arm portion 17a is retracted from the pin 13, but the hook portion 12b is moved away from the bent portion 5.
a, so the second aperture blade 12 is in contact with the first aperture blade 12.
It is maintained in the state shown in the figure. Of course, the second aperture blade 9
The state remains as shown in FIG.

Therefore, when the shutter button is pressed and the release lever 24 is rotated to the right, the disengaged leading blade 28 rotates to the right and begins to open the aperture 1a.
Then, the pin 29 pushes the protrusion 35b by turning the leading blade 28 to the right, causing the first locking lever 35 to turn to the left. Due to this left rotation, the hook portion 35a is retracted from the pin 33, and the rear blade 32, which is released from restraint, starts to rotate to the right. Therefore, in this case, the slit forming surface 28 of the leading blade 28 that has started traveling first
Exposure is performed by moving the slit width formed by the slit forming surface 32a of the trailing blade 32 that starts running after the rear blade 32a. The F value (Av), T value (Tv), and Ev value at that time are as shown in Fig. 3.

(iv) When the first electromagnet device 2... is OFF and the second electromagnet device 15... is OFF.

In this case, the movement of each member due to the counterclockwise rotation of the iron piece lever 5 is as described in (i) above.

On the other hand, by rotating the iron piece lever 17 to the left, the arm portion 17
The engagement between a and the pin 13 is released, and the second aperture blade 12, which is released from restraint, rotates to the left so that the opening 12a faces the aperture 1a. Further, by turning the iron piece lever 17 to the left, the pin 19 pushes the second locking lever 22 to turn it to the left, and by this left rotation, the hook portion 22
a is retracted from the pin 33, but the other hook part 35a
is engaged with the pin 33, so the right rotation of the rear blade 32 is inhibited.

Therefore, after the shutter button is pressed and the release lever 24 is turned to the right, the movements of the leading blade 28 and trailing blade 32 are as described in (iii) above. F value (Av) at that time,
The T value (Tv) and Ev value are as shown in Fig. 3.

As described above, by controlling the on/off combinations of the first and second electromagnet devices 2, 15 according to the subject brightness according to a predetermined program, four types of It becomes possible to take pictures with an Ev value of . If the allowable accuracy of the Ev value is ±1Ev, the above combination will result in
It can cover Ev9 to Ev16 (Figure 2).

Next, a case in which a synchronizer is added will be explained based on FIG. In FIG. 4, the first aperture blade 9, the first and second electromagnet devices 2, 15, etc. in FIG. 1 are omitted to simplify the drawing. In addition, the same members as in FIG. 1 are given the same numbers and repeated explanations will be omitted.

In the figure, 50 is the first synchro lever,
A circular arc portion 50a and an arm portion 50b having the same radius of curvature as the slot 1b are formed, and the shaft 51
It is pivotally supported by the lower substrate 1 via a spring (not shown), and is given a dextrorotary behavior by a spring (not shown), but is restrained by coming into contact with the pin 29.
A connecting lever 53 is formed with a slot 53a, one end of which is pivotally connected to the arm portion 50b via a pin 54, and the other end connected to the slot 53a and the pin 55 (the second aperture blade 12). planted)
The second aperture blade 12 is pivotally connected to the second aperture blade 12 through a fitting. Reference numeral 57 denotes a second synchro lever, which has a circular arc portion 57 having the same radius of curvature as the slot 1b.
a, an arm portion 57b is formed, which is pivotally supported by the lower substrate 1 via the shaft 51, and is provided with dextrorotation by a spring (not shown), which will be described later. The end of the slot 59a abuts against the pin 55 and is restrained. Reference numeral 59 denotes a connecting lever, which is formed with a slot 59a and has a pin 60 at one end.
The other end is pivotally connected to the second diaphragm blade 12 through the slot 59a and the pin 55. Reference numeral 61 denotes a conductive pin, which is installed on the lower substrate 1 and connected to a flash circuit (not shown).

Therefore, when the second electromagnet device 15 is on and the first electromagnet device 2 is on (F7) or off (F3.5), the leading blade 28 rotates to the right and the aperture 1a opens. When released, the engagement between the pin 29 and the arcuate portion 50a is released, and the first
The synchro lever 50 rotates to the right. At this time, the connection lever 53 slides diagonally downward to the left while rotating to the right due to the relationship between the slot 53a and the pin 55.
Then, by turning the first synchronizer lever 50 to the right, the arm portion 50b and the conductive pin 61 come into contact with each other, causing the flash to emit light. After that (the shutter speed is 1/60 seconds),
When the rear blade 32 is released from the restraint and rotates to the right as described above, the pin 33 pushes the arc portion 50a, causing the synchro lever 50 to reversely rotate to the left. Due to this left rotation, the arm portion 50b and the conductive pin 54 are separated, and the flash circuit is interrupted.

Further, when both the first and second electromagnet devices 2 and 15 are off and the opening 12a covers the aperture 1a (at this time, the slit formation of the leading blade 28 that has started traveling first) Exposure is performed by moving the slit width formed by the surface 28a and the slit forming surface 32a of the trailing blade 32 that started traveling later).
The second synchro lever 57, which has been released from the restraint by the counterclockwise rotation of the second synchro lever 57, rotates to the right by the action of the spring, and the arcuate portion 57a abuts against the pin 29 and is restrained. At this time, the arm portion 57b and the pin 61 are not yet in contact with each other. On the other hand, due to the left rotation of the second aperture blade 12, the pin 55
pushes the end of the slot 53a and rotates the first synchro lever 50 to the left. The first synchro lever 50 is restrained in this left-handed position.

Therefore, in this state, the leading blade 28 and the trailing blade 3
2 rotates to the right at regular intervals and reaches the position shown by the two-dot chain line in FIG. Rotates to the right by action. This right rotation brings the arm portion 57b into contact with the conductive pin 61, causing the flash to emit light. After that (the shutter time is 1/
240 seconds), the pin 33 pushes back the second synchro lever 57, the arm portion 50b and the conductive pin 61 are separated, and the flash circuit is cut off.

In other words, according to the synchronizer shown in FIG.
In the cases shown in the figure, flash photography is possible, and three types of aperture apertures can be selected depending on the distance to the subject.

Although the configuration of the camera shutter according to the present invention is as described above, it is of course not limited to this embodiment. For example, the shutter speed and aperture diameter are not limited to the values in the embodiment, but can be changed in various ways.

Since the present invention has the above-described structure, the factors that cause a decrease in exposure accuracy are reduced, and preferable photographing is possible. Furthermore, since the number of unstable elements is reduced, the adjustment time is also reduced.

[Brief explanation of drawings]

Fig. 1 is a plan view of one embodiment of the present invention, Fig. 2 is a diagram showing the amount of light on the image plane, Fig. 3 is a diagram showing a program table, and Fig. 4 is a plan view of another embodiment. be. 1...Lower substrate, 1a...Aperture, 2...
First electromagnet device, 5... Iron piece lever, 9... First aperture blade, 9a... Aperture, 12... Second aperture blade, 12a... Aperture, 15... Second electromagnet device, 17 ... Iron piece lever, 22 ... Second lock lever, 24 ... Release lever, 28 ... Lead blade, 32 ... Rear blade, 35 ... First lock lever, 50 ... First synchronizer Lever, 53... Connection lever, 57... Second synchro lever, 59
...Connection lever, 61...Conduction pin.

Claims (1)

[Claims for Utility Model Registration] (1) An aperture blade device in which three types of aperture diameters can be selected by on/off control of a first electromagnet device and a second electromagnet device; a leading blade that starts traveling after a relatively short distance; a trailing blade that runs behind the leading blade and closes the aperture; A first locking lever that releases the restraint of the trailing blade by the leading blade, and a lever that moves the trailing blade to a restraining position or a non- restraining position by on/off control of the second electromagnetic device. , a second locking lever that releases the restraint of the trailing blade by the leading blade after the leading blade has traveled a relatively long distance when in the restraining position, The second locking lever is selectively positioned in advance in the inhibited position or the non-restricted position by the off control, and when the second locking lever is in the non-restricted position, the first locking lever is The trailing blade, which has been restrained only by When the locking lever is in the inhibiting position, the trailing blade is restrained by the first and second locking levers,
By releasing the inhibition of the second locking lever after the leading blade has traveled a relatively long distance, travel is started, and the second speed shutter speed can be selected, depending on the brightness of the subject. Digital control characterized in that the first electromagnet device and the second electromagnet device are turned on and off to obtain appropriate exposure by appropriately combining the aperture aperture and shutter speed. Shutter for type camera. (2) One of the second speed shutter speeds is the fully open speed, and two types of aperture diameters correspond to the fully open speed, and a first synchro switch is provided that is turned on when the shutter speed is fully open; The other shutter speed is the slit speed, and one type of diaphragm diameter corresponds to the slit speed, and when the slit formed by the leading blade and the trailing blade matches the diaphragm diameter, The digitally controlled camera shutter according to claim 1, further comprising a second synchro switch that is turned on.