JPS6320981Y2 - - Google Patents

Description

[Detailed description of the invention] The invention relates to a digitally controlled camera shutter,
More particularly, it relates to a camera shutter which provides programmable automatic exposure by digitally selecting from four fixed exposure settings.

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 any combination of the first, second, and third locking levers. first and second electromagnetic devices selectively controlling whether running of the trailing blade is stopped only by the first locking lever or by the first locking lever; and a leading blade that subsequently releases the locking of the rear blade by pushing the first, second, and third locking levers, and when the locking of the first locking lever is released or the second locking lever is released. ,
Select the second speed shutter speed so that the rear blade starts running when the third locking lever is also released, and suitably combine the aperture aperture and shutter speed according to the subject brightness. This is achieved by using a digitally controlled camera shutter that allows proper exposure to be obtained.

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 an 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 5 denotes an iron piece lever, which pivotally holds an iron piece 6, is formed with a mat 5a and a bent part 5b, is pivotally supported on the upper substrate 3 via a shaft 7, and is supported by a spring (not shown). As a result, a left rotation force is applied, but the iron piece 6 is held by suction to the iron core 2a and is suppressed. 9 is the first
The aperture blade is formed with an aperture 9a (corresponding to F14) and a hook portion 9b, and is rotatably supported on the lower substrate 1 via a shaft 10, and receives a left rotation force by a spring (not shown). Although the hook portion 9b is biased, the hook portion 9b abuts against the bent portion 5b and is restrained. 12 is a second aperture blade with a pin 13 planted therein and an opening 12a.
(corresponding to F7), a hook portion 12b is formed,
It is pivotally supported by the lower substrate 1 via the shaft 10, and is biased to the left by a spring (not shown), but the hook portion 12b abuts against the bent portion 5b and is restrained. has been done. A second electromagnet device 15 is provided with an iron core 15a and a coil 15b, and is fixed to the upper substrate 3. 17 is an iron piece lever,
The iron piece 18 is pivotally held, a pin 19 is installed, an arm portion 17a is formed, and the arm portion 17a is pivotally supported by the upper substrate 3 via a shaft 20, and is rotated to the left by a spring (not shown). Although the force is applied, the iron piece 18 is held by suction to the iron core 15a and is restrained. 22
is 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 given right-handed rotation by a spring (not shown). However, it comes into contact with pin 19 and is restrained. 23 is a third locking lever, and the hook part 2
3a, a bent portion 23b is formed, and the shaft 20
The bent portion 23b is pivotally supported by the upper substrate 3 via a spring (not shown), and is restrained by the bending portion 23b coming into contact with the hook portion 5a. 24 is the release lever, surface 24
a is formed and is pivotally supported by the lower substrate 1 via a shaft 25, and is given a left-rotating behavior by a spring (not shown), but is restrained by coming into contact with a stopper 26. There is. 28 is the leading blade, pin 29
is planted and has a slit forming surface 28a formed thereon, is pivotally supported by the lower substrate 1 via a shaft 30, and is biased with right rotation force by a spring (not shown). is restrained by the pin 29 coming into contact with the surface 24a. Reference numeral 32 denotes a rear blade, which has a pin 33 planted thereon to form a slit forming surface 32a, is pivotally supported by the lower substrate 1 via the shaft 30, and is supported by a spring (not shown). Although the right turning force is applied, the pin 33 comes into contact with the hook portions 22a, 35a and is restrained. 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 5b 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 does not operate because it is also restrained by the arm portion 17a. On the other hand, the third locking lever 23, which is released from the engagement between the hook portion 5a and the bent portion 23b, rotates to the right, and the hook portion 23a locks onto the pin 33.
enters the motion trajectory of

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. Note that the pin 29 pushes the protrusion 35b by rotating the leading blade 28 to the right, and the first locking lever 35 is rotated to the left to retract the hook portion 35a from the pin 33.
Since the rear blade 32 is in contact with the rear blade 32, the movement of the rear blade 32 is suppressed. Thereafter, when the leading blade 28 rotates to the right to the position where the aperture 1a is fully opened, the pin 29 moves to the second position.
The locking lever 22, the first locking lever 35, and the third locking lever 23 are simultaneously pressed to rotate each lever to the left. Due to this left rotation, the hook portions 22a, 2
3a is disengaged from the pin 33, and the unrestrained rear blade 32 rotates to the right and covers the aperture 1a. This completes one exposure, and the F value (Av), T value (Tv), and Ev value at that time are as shown in Fig. 3.

(ii) 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 lever 17 to the left, the arm 1
7a and the pin 13 are released, and the second aperture blade 12, which is released from the restraint, rotates to the left and closes 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 turning to the left, the hook part 22a retreats from the movement locus of the pin 33, but the other hook parts 23a and 35a is pin 33
Since the rear blade 32 is engaged with the rear blade 32, right rotation of the rear blade 32 is inhibited.

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

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

(iv) 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 due to the counterclockwise rotation of the iron piece lever 17, and the hook portion 22a retreats from the movement locus of the pin 33. As a result, the pin 33 engages only with the hook portion 35a. Further, by turning the iron piece lever 17 to the left, the arm portion 17a is retracted from the restraining position of the pin 13, but since the hook portion 12b is in contact with the bent portion 5b, the second aperture blade 12 is in the state shown in FIG. Retained. Of course, the first aperture blade 9 also
It remains as shown in the figure.

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 retreats from the motion locus of the pin 33, and the rear blade 32, which is released from restraint, begins to rotate to the right. Therefore, in this case, the slit forming surface 28a of the leading blade 28 that starts running first and the slit forming surface 32a of the trailing blade 32 that starts running later.
Exposure is performed by moving the width of the slit formed by. The F value (Av), T value (Tv), and Ev value at that time 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 addition, in order to simplify the drawing, FIG. 4 shows the first and second aperture blades 9,
12, the first and second electromagnet devices 2, 15, etc. are omitted. 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 a synchro lever, which has a circular arc portion 50 having the same radius of curvature as the slot 1b.
a is formed and is pivotally supported on the upper substrate 3 via a shaft 51, and is given dextrorotary behavior by a spring (not shown).
It is restrained by coming into contact with. 54 is a conduction pin,
It is planted on the upper substrate 3 and connected to a flash circuit (not shown).

Therefore, when the leading blade 28 rotates to the right as shown by the two-dot chain line and the aperture 1a is fully opened, the engagement between the pin 29 and the arcuate portion 50a is released, and the synchronizer lever 50, which is released from restraint, rotates as shown by the two-dot chain line. Rotate to the right as shown. Due to this right rotation, the arc portion 50a and the conductive pin 54 come into contact and the flash emits light. after that,
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 arcuate portion 50a and the conductive pin 54 are separated, and the flash circuit is interrupted.

In other words, flash photography is possible in cases .about. in FIG. 3, 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 the drawing]

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 locking lever, 23 ... Third locking lever, 24 ... Release lever, 28 ... Lead blade, 32 ... Rear blade, 35 ... First locking lever Stop lever.

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; and an on/off control for the first electromagnet device. Therefore, the trailing blade moves to a position where travel is inhibited or a non-restricting position, and when in the inhibiting position, the trailing blade is released from being inhibited by the leading blade after traveling the relatively long distance described above. a third locking lever; the positions of the second and third locking levers are selected in advance by selective on/off control of the first and second electromagnetic devices; a state in which the blade is restrained only by the first locking lever, or
The rear blade is caused to take either one of the states in which it is restrained by the first locking lever and at least one of the second and third locking levers, and the rear blade is in the first locking state. When restrained only by the lever, the trailing vane starts running after the aforementioned leading vane has traveled a relatively short distance, while the trailing vane engages the first locking lever and at least the second and third locking levers. When inhibited by one of the locking levers, the trailing blade starts running after the leading blade has traveled a relatively long distance, thereby selectively enabling the shuttering of the two bundles; It is characterized by controlling on/off of the first electromagnet device and the second electromagnet device according to the brightness of the subject and appropriately combining the aperture aperture and shutter speed to obtain proper exposure. Digitally controlled camera shutter. (2) One of the second speed shutter seconds is the fully open second,
A digitally controlled camera according to Claim 1 of the above-mentioned utility model registration claim, characterized in that three types of aperture apertures correspond to the fully open seconds, and a synchro switch that is turned on when fully opened is provided. Shyatsuta.