JPS6233578B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shutter with an electromagnetic release automatic focusing mechanism.

Conventionally, the following types of electric shutters with automatic focusing mechanisms are known.

First, the shutter button is mechanically released by pressing down to activate autofocus, and after focusing is completed, the shutter blade is released, and then,
This type of shutter blade closes when an electromagnet is activated after the exposure time has elapsed.

Next, when the shutter button is pressed down, the first electromagnet is activated to activate autofocus like an electromagnetic release, and the shutter blade is closed by the activation of the second electromagnet.

Finally, when the shutter button is pressed down, the shutter button is mechanically released and the autofocus is activated, and the electromagnet is activated by the focusing end signal to complete the focusing, and then the autofocus blade is activated by the mechanical release. When the shutter blade is opened and the exposure time has elapsed, the electromagnet is activated and the shutter blade closes.

That is, in conventional shutter release systems, the shutter is released mechanically, or the shutter is released using an electromagnetic release system, but the exposure time is controlled using a separate electromagnet.

Therefore, the mechanical release type has disadvantages in that the release operation is slow, camera shake is likely to occur, and the timer mechanism and second adjustment mechanism are complicated.

Further, even with the electromagnetic release type, there is a drawback that a plurality of electromagnets must be used.

The present invention has been made in view of the above points, and is an electromagnetic release shutter equipped with an automatic focusing mechanism, in which the release operation and the time adjustment operation can be controlled with a single electromagnet. The purpose is to provide

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

First, the structure will be explained with reference to FIG. 1 showing the shutter set state. 1 is a shutter board on which an aperture 1a is formed;
A is covered by a shutter blade (not shown) (which also serves as an aperture blade). Note that the shape of the shutter board 1 is omitted. Reference numeral 2 denotes a release plate, which forms pressing surfaces 2a and 2b, is slidably guided by guide pins 3 and 4, and is supported by a spring 5.
Although the tendency to move upward is acting due to groove 2
The guide pins 3 and 4 are held in place by the ends of the guide pins 3 and 4 coming into contact with each other. Reference numeral 6 denotes a release lock lever, which has stepped portions 6a, 6b, a recessed portion 6c, and bent portions 6d, 6e, is supported on the release plate 2 by a shaft 7, and has a right-handed rotation action by a spring 8. However, the side surface abuts against the head of the guide pin 4 and is restrained. Note that the step portion 6a is formed of a slope. 9 is a timer set lever, which forms hook parts 9a, 9b and a cam surface 9c;
is pivotally supported on the shutter board 1 by a spring 11.
Due to this, the left rotation behavior is exerted, but it is restrained by coming into contact with a stopper (not shown). Reference numeral 12 denotes a timer locking lever, which forms a bent portion 12a and is attached to the shaft 1.
3 to the shutter board 1, and the spring 1
4, the right-handed rotation behavior is exerted by the bending portion 12a, but the cam surface 9c of the timer set lever 9
It is restrained by coming into contact with. SW ₁ is a power switch, and SW ₂ is a release start switch. 2
0 is an electromagnet, which is composed of an iron core 20a, a yoke 20b, and an iron piece 20c. Reference numeral 21 denotes an iron piece lever, which has a hook portion 21a and bent portions 21b and 21c, is pivotally supported on the shutter base plate 1 by a guide pin 22, and has a right-handed rotation action by a spring 23. 20c is held in a state separated from the iron core. Note that the iron piece lever 21 and the iron piece 20c are freely connected by a pin 24. 25 is the start locking lever, hook 2
5a, a pin 25b is installed, and the pin 25b is pivotally supported by the guide pin 22, and the spring 26 exerts a right-handed rotational behavior.
It is restrained by coming into contact with. Reference numeral 27 denotes a first charge lever, which has bent portions 27a, 27b, and 27c, is supported pivotally by the guide pin 22, and has a left-handed rotation behavior by a spring 28.
c comes into contact with the bent portion 21b and is restrained.
Reference numeral 30 designates a second charge lever, which has an arm portion 30a and bent portions 30b and 30c, is pivotally supported on the shutter base plate 1 by a guide pin 31, and has a right-handed rotation action by a spring 32. , is restrained by coming into contact with a stopper (not shown). 33 is a piston locking lever, which includes a hook 33a and an arm portion 33.
b, bent portions 33c and 33d (see FIG. 10) are formed, and are pivotally supported on the shutter base plate 1 by a shaft 34, and a right-handed movement is exerted by the spring 32, but the hook 33a is engaged with and restrained by the bent portion 30b. Reference numeral 35 denotes an autofocus locking lever, which has an arm portion 35a and a locking surface 35b, has a pin 35c (see FIG. 6), and is supported on the shutter board 1 by a shaft 36, as shown in the figure. Although the left rotation behavior is exerted by a spring that does not move, it is suppressed by a stopper (not shown). Reference numeral 38 denotes an autofocus set plate, which includes an arm portion 38a, a bent portion 38b, and an arm portion 38a that interlocks with a shutter charge plate (not shown).
The spring 4 forms a hook portion 38c, has a pin 38d planted thereon, is slidably guided by the large diameter portions of the guide pins 39 and 40, and is charged.
The driving force in the right direction is applied by 1, but
The hook portion 38c is engaged with and restrained by the locking surface 35b. 42 is a start board, arm part 42
a, 42b, bent portions 42c, 42d, protrusion 42f
A pin 42e facing toward the back side of the page is mounted on the arm portion 42a, and is slidably guided by the small diameter portions of the guide pins 39 and 40, and is moved rightward by a charged spring 43. The driving force of the pin 42e is applied to the hook portion 25.
a and is restrained. 46 is a slide plate forming arm parts 46a, 46b, 46c, 46d and a half-moon pin 46e, and the guide pin 22, 31
Although the arm portion 46c is slidably guided by the pin 38d and is biased with a rightward driving force by the charged spring 47, the arm portion 46c is restrained by coming into contact with the pin 38d. Reference numeral 48 denotes a locking lever, which has a hook portion 48a and an arm portion 48b, is supported by a shaft 49 on the shutter base plate 1, and has a right-handed rotation action by a spring 50. 48b comes into contact with the bent portion 27a and is restrained. Reference numeral 51 denotes an opening/closing lever, which has a pin 51a and a half-moon pin 51b, is supported on the shutter base plate 1 by a shaft 52, and is biased with a dextrorotatory driving force by a charged spring 53. , the half-moon pin 51b is engaged with and restrained by the hook 48a. The opening/closing lever 51 is connected to open and close the shutter blade by means not shown, and in the set state shown in the figure, the shutter blade is closed as described above.

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

In the shutter set state shown in FIG. 1, when the photographer first presses down the shutter button (not shown), the release plate 2 slides downward in conjunction with this.
The initial slide closes the power switch _SW1 and connects the power supply. As a result, an exposure warning circuit is activated and preliminary operations such as a power supply check are started.

Then, when the release plate 2 further slides downward, the recess 6c and the head of the guide pin 4 face each other before the start switch SW ₂ closes, so the release lock lever 6 is rotated to the right by the action of the spring 8. Then, as shown in Fig. 2, guide pin 4
The head of the head engages with the recess 6c.

Thereafter, when the release plate 2 is further slid downward, the release lock lever 6 is pushed by the head of the guide pin 4 and rotates to the left. Therefore, the push-down load on the release button increases by the amount required to release this engagement.

Then, by the subsequent downward slide of the release plate 2, the start switch _SW2 is closed, the electromagnetic release is operated, and automatic focusing is started as described later.

The above is the operation for normal photography, but next we will explain the case of photography using a self-timer.

First, the self-timer is set by turning the timer set lever 9 to the right from the state shown in FIG. By this right rotation, the bent portion 12a of the timer locking lever 12 and the hook 9
b is engaged, and the set state is maintained as shown in FIG. In this set state, the hook portion 9a enters into the operating locus of the stepped portion 6a of the release lock lever 6.

When the release plate 2 is slid downward from this self-timer set state in the same manner as described above, the power switch SW ₁ is first closed, and then the slope of the stepped portion 6a is pushed by the hook 9a and the release lock lever 6 is As the release plate 2 slides downward, the engagement between the stepped portion 6a and the hook 9a is broken, and as shown in FIG. contact with the part. Therefore, the push-down load on the release button increases by the amount required to release this engagement. Then press the start switch
SW ₂ closes and the electromagnetic release operates, but in this case the self-timer is set, so the release operation is blocked for a certain number of seconds.

Note that the self-timer setting is canceled mechanically by a shutter blade closing operation completion signal. For example, when the release lock lever 6 rotates to the left in conjunction with the operation of the closing member of the shutter blade, the bent portion 6d pushes the timer locking lever 12 to rotate it to the left, and the timer set lever 9 returns to its left rotation.

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

As mentioned above, when start switch SW ₂ closes,
The electromagnet 20 is energized almost immediately in the case of normal photography, or after a certain period of time has elapsed in the case of self-timer photography. Therefore, the iron piece 20c is attracted to the iron core 20a, and the iron piece lever 21 is interlocked with the iron core 20a.
rotates to the left. Due to this left rotation, the bent portion 21b,
The start locking lever 25 rotates to the left via the pin 25b, releasing the restraint of the pin 42e by the hook portion 25a. The start plate 42, which is released from the restraint, starts to slide rightward due to the restoring force of the spring 43.

Further, following the counterclockwise rotation of the iron piece lever 21, the first charge lever 27 is also slightly counterclockwise rotated by the spring 28. On the other hand, the hook portion 21a enters the movement locus of the half-moon pin 46e. (The operation up to this point is shown in FIG. 5.) Thereafter, at the final stage of the slide of the start plate 42, the arm 42b pushes the pin 35c of the arm 35a to rotate the autofocus locking lever 35 to the right and release the hook. The engagement between the portion 38c and the locking surface 35b is released. Then, the autofocus set plate 38, which has been released from the restraint, starts to slide rightward by the restoring force of the spring 41. The slide of the autofocus set plate 38 is slowed down by a governor or the like, and an autofocusing mechanism (not shown) operates to perform focusing. This sliding causes the pin 38d to separate from the arm portion 46c.

In addition, as the start plate 42 slides, the bending portion 42c simultaneously pushes the arm portion 33b, causing the pin lock locking lever 33 to rotate to the left, thereby locking the hook 33a.
and release the engagement of the bent portion 30b.

Finally, the start plate 42 stops with the protrusion 42f entering the operating locus of the stepped portion 6b of the release lock lever 6. (The operation up to this point is shown in FIG. 6.) Therefore, the slide plate 46, which has been released from the restraint of the pin 38d, slides slightly to the right, but the half-moon pin 46e is engaged with the hook 21a and is restrained again. Ru. Further, at this point, when the downward force on the release plate 2 is released, the stepped portion 6b comes into contact with the protrusion 42f and is restrained, resulting in a release lock state.

Thereafter, at the final stage of sliding of the autofocus set plate 38, the pin 38d is moved to the arm portion 30a.
Press to rotate the second charge lever 30 to the left. Due to this left rotation, the bent portion 30c becomes the bent portion 27.
b to rotate the first charge lever 27 to the right, which causes the bent portion 27a to move toward the arm portion 48b.
Press to rotate the locking lever 48 to the left. and,
By this left rotation, the hook 48a and the half-moon pin 51b are
The engagement of the opening/closing lever 5 is released and the restraint is released.
1 starts turning to the right due to the restoring force of the spring 53.
Due to this right rotation, the shutter blade (not shown) begins to open the aperture 1a, and exposure begins.

On the other hand, the spring 23 is charged by the right rotation of the first charge lever 27, and a strong right rotation driving force is applied to the iron piece lever 21. (The operation up to this point is shown in Fig. 7.) Then, when a suitable time has elapsed after the start of exposure, the electromagnet 2
0 is cut off, and the iron core 20a is demagnetized. Therefore, the iron piece lever 21 is connected to the charged spring 23.
It rotates to the right due to the restoring force, and the engagement between the hook portion 21a and the half-moon pin 46e is released. Then, the unrestrained slide plate 46 slides to the right due to the restoring force of the spring 47, and at the final stage, the arm portion 46a pushes the pin 51a to reversely rotate the opening/closing lever 51 to the left. This reverse rotation to the left causes the shutter blade to close from the fully open state or from the middle of the opening operation, and one exposure operation is completed.

On the other hand, at the final stage of the slide plate 46, the arm portion 46b simultaneously pushes the bent portion 6e to rotate the release lock lever 6 to the left. By this left rotation, the engagement between the protrusion 42f and the stepped portion 6b is released, and the release lock state is released. (The operation up to this point is shown in Fig. 8.) Then, as shown in Fig. 9, the release plate 2, which has been released from the restraint, slides upward by the restoring force of the spring 5 and returns to its original state. SW ₂ is released, and then power switch SW ₁ is released to complete one shooting operation. At this time, the release lock lever 6 remains rotated to the left, so the recess 6
c does not engage with the guide pin 4.

The shutter setting operation is performed sequentially from the state shown in FIG. 9 by pushing the arm 38a and sliding the autofocus setting plate 38 to the left in conjunction with the winding operation of a charge lever (not shown).

Finally, the focus lock operation by prefocus will be explained based on FIG.

First, in this case, operate the autofocus locking lever 35 from the outside and turn it to the right to release the hook part 3.
8c and the engagement surface 35b are released. Then, the autofocus set plate 3 released its restraint.
8 slides to the right and automatic focusing is performed. At this time, the pin 38d pushes the arm 30a and tries to turn the second charge lever 30 to the left, but it cannot turn because it is prevented from being engaged by the pin lock locking lever 33. Therefore, when automatic focusing is completed, the automatic focusing plate 38 is stopped by the second charge lever 30, and the subsequent operation is not continued.

In addition, the slide plate 46 is moved by the movement of the pin 38d.
The slide plate 46 also slides, but the arm portion 46d
is restrained by the bending portion 33d and stops immediately.

Thereafter, when the release button is pressed down and the iron piece lever 21 is attracted to the iron core 20a of the electromagnet 20 and a release operation is performed, the start plate 42 and the pin lock locking lever 33 operate as described above. Then, the autofocus set plate 38 slides again from the ninth state.
Thereafter, the shutter blades are opened and closed in the same manner as described above.

As described above, the present invention has the advantage that the electromagnetic release and time control can be performed with a single electromagnet, and the need for expensive electromagnet devices can be reduced.

In addition, by using an electromagnetic release type shutter with autofocus, focusing is performed immediately before the shutter is released even during self-timer shooting, making it possible to deal with changes in the subject when the self-timer is activated. There is.

Furthermore, by adopting a structure in which the inhibition of autofocus-related members is released through a start plate that is released from inhibition by the action of an electromagnetic device, the operability of the focus lock (prefocus) is improved. be.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operation of a part of FIG. 1 during general photography, and FIG.
4 is an explanatory diagram of the operation during self-timer shooting of a part of FIG. This is an explanatory diagram of the operation at the time of operation, and some parts are omitted. 2... Release plate, 9... Timer set lever, 20... Electromagnet, 21... Iron piece lever, 25
...Start locking lever, 27...First charge lever, 30...Second charge lever, 33
...Pin lock lock lever, 35...Auto focus lock lever, 38...Auto focus set plate, 42...Start plate, 46...Slide plate, 48...Latch lever, 51...Open/close lever , SW ₁ ...Power switch, SW ₂ ...Release start switch.

Claims (1)

[Claims] 1. By the output of an exposure control circuit that is excited by the power supply corresponding to the release operation of the camera and attracts the iron piece member located at the separated position, and starts operating in response to the opening operation of the shutter blade. An electromagnet that is demagnetized when the power supply is cut off and releases the iron piece member and returns to the separated position; and an autofocus release member that is released from the lock and starts operating in conjunction with the attracting operation of the iron piece member. an autofocus operating member that is unlocked and starts operating in conjunction with the movement of the autofocus release member after a predetermined movement; an opening/closing member that is released from the lock and moves in a given habit direction to open the shutter blade; The suppression is also performed when the iron piece member is in a attracted state, and when the iron piece member returns to the separated position, the suppression is released and the opening/closing member is moved in the counter-action direction to cause the shutter blade to move. A shutter with an electromagnetic release automatic focusing mechanism, characterized by comprising a closing drive member for closing the shutter. 2. The power supply is cut off by the output of the exposure control circuit which is excited by the power supply corresponding to the camera release operation and attracts the iron piece in the separated position, and starts operating in response to the release operation of the shutter blade. an electromagnet that is demagnetized by the iron piece to release the iron piece member and return to the separated position; an autofocus release member that is released from the lock and starts operating in conjunction with the attracting operation of the iron piece member; an autofocus operating member that starts operating when the autofocus release member is moved; an autofocus operation start control member that is released by the autofocus operation member or by receiving an operation from the outside; The opening/closing member operates in the habit direction to open the shutter blade, and is restrained in a tension state by the state before operation of the autofocus operating member, and is also restrained by the attracted state of the iron piece member. a closing drive member that operates after the inhibition is released when the iron piece member returns to the separated position and operates the opening/closing member in a counteractive direction to close the shutter blade; and the autofocuser. The function is to prevent the operation member from moving to the final range and when the closing drive member is in a tensioned state, but the function is to prevent the movement of the operating member from moving to the final range. A shutter with an electromagnetic release automatic focusing mechanism, characterized by comprising a stop member.