JPS5918435Y2 - Focal plane shutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a focal plane shutter configured such that a group of leading blades closes a mapping window after an exposure control operation.

This type of shutter has already been proposed, but in the conventional device, the leading blade driving member and the leading blade operating member are connected by a connecting member, and the connected state is maintained until the end of the exposure control operation. The connection is released by movement of the group drive system members.

Therefore, the release part of the rear blade group drive system member must have a shape and size that can reach the connecting part, and there is a drawback that the arrangement of each member is subject to certain restrictions.

Therefore, the present invention releases the connection between the leading blade driving member and the leading blade actuating member immediately after the opening operation of the leading blade group is completed, and also prevents the return movement of the leading blade actuating member that can close the leading blade group by another engagement. The locking member is locked by a locking member to provide flexibility in the arrangement position of the locking member, eliminating restrictions on the configuration and arrangement of each member, and moving forward in conjunction with the opening operation of the leading blade group, By using the existing X contact control member, which is moved back in conjunction with the closing operation of the rear blade group, as the locking member, a focal plane shutter of this type that does not require an increase in the number of parts is provided.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

A shutter plate 1 forms a mapping window 1a.

Reference numeral 2 denotes an intermediate plate which forms a mapping window 2a aligned with the mapping window 1a.

3 is a cover plate, which has a mapping window 3 aligned with the mapping windows 1a and 2a.
It forms a.

Reference numeral 4 denotes a leading blade group, which is arranged between the intermediate plate 2 and the cover plate 3.

Reference numeral 5 denotes a rear blade group, which is arranged between the shutter plate 1 and the intermediate plate 2.

Reference numerals 6 to 12 and 13 and 14 are shafts and pins implanted on the shutter plate 1.

15 is a leading blade drive arm pivotally connected to the shaft 6;
In addition, a pin 15b is installed on the back side and a pin 15C is installed on the front side, and a spring 16 provides levorotation.

17 is a leading blade operating arm pivotally connected to the shaft 6, and the hook 1
7a, a circumferential surface 17b, and a stepped portion 17C, a pin 17d is installed on the front side, a pin 17e is installed on the back side, and further supports a shaft 17f.

Reference numeral 18 denotes a connecting lever pivotally mounted on the leading blade actuating arm 17 by a shaft 17f, and is connected to the arm 15 of the leading blade driving arm 15.
Hook 18 that can lock a and the leading blade operating arm 1
The arm 18b and the bending arm 18c can be engaged with the pin 17d of 7.
It has an imposing shape.

A spring 19 is hung between the leading blade driving arm 15 and the leading blade operating arm 17, and acts to rotate the operating arm 17 to the right.

Reference numeral 20 designates a leading blade locking lever pivotally connected to the shaft 7, which can lock the hook 17a of the leading blade actuating arm 17, and forms a bend 20a that cannot be connected to the side surface 18d of the connecting lever 18. 21 imparts levorotation, and pin 13 restricts the left rotation.

The pin 17e of the leading blade actuating arm 17 extends through an arcuate long groove (not shown) in the shutter plate 1 and the intermediate plate 2 to a position where the leading blade group 4 can be operated.

Reference numeral 22 denotes a brake lever pivotally connected to the shaft 8, which includes a side surface 22a and a recess 2 to which the pin 17e of the leading blade operating arm 17 engages.
2b, a convex portion 22C and a bend 22d with which the pin 15b of the leading blade drive arm 15 can engage.

23 is a flexible member supported by the shaft 9, and the bend 22d of the brake lever 22 can come into contact with this.

A release plate 24 is fixedly supported by the shafts 8 and 9, and forms an arm 24a with which the bend 18C of the connecting lever 18 can engage.

Reference numeral 25 denotes an X contact lever pivotally mounted on the shaft 10, which engages the circumferential surface 17b of the leading blade operating lever 17 and
It has an arm 25a that can engage C, a bend 25b and a bulge 25C, and is given levorotation by a spring 26.

Reference numeral 27 denotes an X-contact piece, which is arranged so as to be able to engage with the overhang 25C of the X-contact lever 25.

28 is a rear blade drive lever pivotally connected to the shaft 11, and the arm 28
It forms a convex portion 28b that can push the bent portion 25b of the X contact lever 25, and a pin 28C on the back side.
Pins 28d are implanted on the front side of each, and a spring 29 provides levorotation.

30 is a rear blade locking lever pivotally connected to the shaft 12;
0a and the arm 28a of the rear blade drive lever 28, a spring 31 imparts levorotation, and a pin 14 restricts the left rotation.

The pin 28C of the rear blade drive arm 28 extends through a long groove in the shape of an arc locus (not shown) of the shutter plate 1 to a position where the rear blade group 5 can be operated.

Next, the operation will be explained.

When the release operation is performed from the set state shown in Figure 1,
After the well-known automatic diaphragm mechanism (not shown) is activated and the mirror mechanism is activated, the leading blade locking lever 20 is rotated to the right against the tension of the spring 21, and the bending 20a is caused by the leading blade actuating lever 1.
It comes off from the hook 17a of No.7.

Since the leading blade driving lever 15 and the leading blade operating lever 17 are connected by a connecting lever 18, the driving lever 1
5 and the operating lever 17 are integrally rotated to the left by the tension of the spring 16.

In this left turning stroke, first, the leading blade operating lever 17
The pin 17e engages the side surface 22a of the brake lever 22 and receives braking while rotating it to the right, and the leading blade drive lever 15 bends 22d in the final operating range of its movement.
When the pin 15b comes into contact with the flexible member 23, the pin 15b comes into contact with the convex portion 22C, thereby receiving a strong braking force.

On the other hand, the connecting lever 18 is bent 18C before the final operating range of the left turning stroke of the leading blade actuating lever 17 and the release plate 24 is bent.
The hook 18a is engaged with the arm 24a of the leading blade drive lever 15, thereby causing the hook 18a to rotate to the right.
It comes off completely.

At this time, the leading blade operating lever 17 further rotates to the left due to inertia.
When the pin 17e comes into contact with the four parts 22b of the brake lever 22, it is braked, and then the tension of the spring 19 causes it to rotate to the right.

On the other hand, in the leftward turning stroke of the leading blade actuating lever 17, just before the hook 18a of the connecting lever 18 comes off from the arm 15a of the leading blade driving lever 15, the stepped portion 17C of the leading blade actuating arm 17 opposes the arm 25a. , X contact lever 2
5 is rotated to the left by the tension of the spring 26, and the tip of the iron arm 25a enters the stepped portion 17C.

This counterclockwise rotation of the X-contact lever 25 causes the overhang 25C to press the X-contact piece 27, and the right-handed rotation of the leading blade operating lever 17 is stopped without causing any bounce.

As a result, the leading blade group 4, which was released by turning the leading blade operating lever 17 to the left, is held in the open state, and all the states are in the second state.
It will look like the figure.

Next, after the proper exposure time has elapsed by a known method, bending 3
0a is pushed, and the rear blade locking lever 30 is released by the spring 31.
When the bend 30b is removed from the arm 28a, the rear blade drive lever 28 is rotated to the left by the tension of the spring 29, closing the rear blade group 5.

In addition, in the final operating range of the left turning stroke of the trailing blade drive lever 28, the convex portion 28b pushes the bending 25b, so the X contact lever 25 is turned right against the tension of the spring 26, and the overhang 25 At the same time as the pressing of the X contact piece 27 by C is released, the arm 25a is pulled out from the stepped portion 17C.

Therefore, the leading blade operating lever 17 is sufficiently rotated to the right by the tension of the spring 19 to move the leading blade group 4 into the mapping windows 2a and 3.
a, 1a to the closed position, and as a result, each mapping window is doubly covered by the trailing blade group 5 and the leading blade group 4.

Through the above operations, the entire state becomes as shown in FIG. 3.

In the setting operation, a set member (not shown) retracts the members (not shown) that rotate the leading blade locking lever 20 and the trailing blade locking lever 30 to the right, respectively, and also moves the leading blade drive lever 15 and the trailing blade. This is done by rotating the drive lever 28 to the right by operating the pins 15C and 28d against the tension of the springs 16 and 29, respectively.

That is, first, the leading blade locking lever 20 is rotated to the left by the tension of the spring 21, and the bend 20a faces within the trajectory of the hook 17a on the leading blade operating lever 17, and the side surface 18d
is pushed to rotate the connecting lever 18 to the left until the arm 18b engages the pin 17d, so that the hook 18a faces within the trajectory of the arm 15a on the leading blade drive lever 15, and the trailing blade locking lever 30 is rotated to the left by the tension of the spring 31 to a position where it is restricted by the pin 14, so that the bend 30b is within the trajectory of the arm 28a on the trailing blade drive lever 28.

After that, in the final range of the setting operation, the leading blade drive lever 15
In this case, the arm 15a engages with the hook 18H while pushing the connecting lever 18 (and the leading blade locking lever 20), and the trailing blade drive lever 28 engages with the hook 18H while the arm 28a pushes the trailing blade locking lever 30. While moving, it engages the bend 30b.

As a result, the rear blade group 5 has mapping windows 1a, 2a, 3
A is brought to the position where it is released, and everything is as shown in Figure 1.

In the above embodiment, the X contact lever 25 is rotated to the right by using the left rotation movement of the rear blade drive lever 28, but it is also possible to use the restoring movement of a mirror mechanism (not shown). good.

In addition, a spring 19 that gives dextrorotation to the leading blade operating lever 17
One end may be supported not only on the leading blade drive lever 15 but also on the shutter plate 1. Furthermore, the spring 21 of the leading blade locking lever 20 is not used as the left turning force source of the connecting lever 18, It may be provided separately.

As described above, the focal plane shutter of the present invention is
Since the leading blade operating member connected to the leading blade driving member is locked by an independent locking member after the connection is released, flexibility can be provided in the arrangement position of the locking member. Therefore, there are no restrictions on the overall arrangement of each member, and the use of the X-contact control member as a locking member does not result in an increase in the number of parts, which is extremely effective in practice.

[Brief explanation of the drawing]

1, 2, and 3 show an embodiment of the focal plane shutter according to the present invention in a set state, a state in the middle of operation, and a state at the end of operation, respectively.
shows a plan view of the shutter mechanism, and b in each figure shows a cross-sectional view of the blade group.

Claims (2)

[Scope of utility model registration request] (1) A leading blade driving member provided with a force source in the direction of opening the leading blade group, and a leading blade operating member for operating the leading blade group provided with a force source in the direction of closing the leading blade group. ,
a connecting member pivotally mounted on the leading blade actuating member and engaging the leading blade driving member and connecting the actuating member to the driving member in a direction to open the leading blade group; With the displacement in the direction of opening the leading blade group, the actuating member approaches a position where the return movement can be locked, and is retracted from the locking position by the movement of the member related to the exposure termination operation. facing the movement range of the connecting member accompanying the movement of the leading blade actuating member in the direction of releasing the leading blade group, and in the direction of releasing the connecting member from the leading blade driving member. A focal plane shutter comprising a displacing release member. (2) The focal plane shutter according to claim (1), wherein the locking member is an X-contact control member and is retracted from the locking position by movement of the rear blade drive member.