JPS5918436Y2 - Focal plane shutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a focal plane shutter of the type in which a leading blade group closes a mapping window after an exposure control operation.

The leading blade group system members in this type of shutter operate a driving member provided with a force source in the direction of opening the leading blade group, and a driving member provided with a force source in the direction of closing the leading blade group. It consists of an actuating member and a connecting member that connects the actuating member to the driving member in the direction of opening the leading blade group, and the conventional device has an independent power source so that the connecting member also has the connecting action. It had been granted.

The present invention locks the leading blade group member in a tensioned state.

By using the force source of the locking member as the acting force source of the connecting member, it is possible to provide a focal plane shutter with a reduced number of parts and a simplified configuration.

An embodiment of the present invention will be described below 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.

A rear blade group 5 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;
a and a pin 15b on the back side 28 a
When it comes off, the rear blade drive lever 28 rotates to the left due to 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 and la are brought to the closed positions, so that 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 turn 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 pin 1 due to the tension of spring 31.
4 until the bend 30b is within the trajectory of the arm 28H 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 18a while pushing the connecting lever 18 (and the leading blade locking lever 20), and the trailing blade drive lever 28 engages with the hook 18a 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.

As described above, the focal plane shutter of the present invention is
Since the connecting force of the connecting member that connects the leading blade driving member and the leading blade operating member is used as the force source of the locking member that locks the leading blade driving member in the tensioned position,
There is no need to specially arrange a spring member, the number of parts is reduced, the structure is simplified, and it 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 (1)

[Scope of utility model registration request] A leading blade driving member provided with a force source in the direction of opening the leading blade group, 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, and the leading blade. a connecting member pivotally mounted on the actuating member and engaging the leading blade drive member to couple the actuating member to the driving member in a direction to open the leading blade group; and a connecting member in a direction to open the leading blade group; A force source in a direction facing within the movement locus of the blade actuating member is applied and engages the actuating member at its habitual displacement position to lock the leading blade driving member in the tensioned position via the connecting member and to adjust its displacement habit. a closing locking member of the leading blade group which is displaceable by a force in a direction in which the connecting member can be engaged with the driving member and is disengaged from the time actuating member when the coupling member is displaced in the anti-habit direction; As the leading blade actuating member is displaced in the direction of opening the leading blade group, it approaches a position where the returning movement of the actuating member can be locked, and is retracted from the locking position by the movement of the member related to the exposure termination operation. The opening locking member of the leading blade group to be released and the connecting member facing the movement range of the connecting member accompanying the movement of the leading blade operating member in the direction of opening the leading blade group, and the securing member of the connecting member with the leading blade driving member. A focal plane shutter comprising a release member that is displaced in a direction to release the connection.