JPH0446262Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a blade support structure for a vertically traveling focal plane shutter for a camera.

[Prior art and its problems]

As one of the support structures for focal plane shutters for vertically traveling cameras,
The one shown in the publication is known.

As shown in FIG. 2, the conventional example includes a substrate 1, and a light-shielding blade including at least a first blade 2a, a second blade 2b, and third blades 2c, 2d, and 2e for opening and closing the aperture 1a. with a group,
A first blade having one end pivotally connected to the substrate, and the first blade, second blade, and third blade being pivotally connected to each other at different locations in order from the tip of the other end and moving away from themselves in order. The first arm 3a,
The first blade, the second blade, and the third blade are pivotally connected to the substrate at one end, and the first blade, the second blade, and the third blade are pivotally connected to each other in order from the tip of the other end at different locations and away from themselves in order, This configuration includes the first arm and a second arm 3b forming a parallel link.

In this conventional configuration, in order to narrow the arrangement space of the arm support mechanism on the left side of the aperture 1a, the intervals between the pivot points of the core blades 2a to 2e in the first arm 3a and the second arm 3b are set narrowly. There is. As a result, especially the first blade (for slit formation) 2a, the second blade 2b
It is necessary to have a shape that does not interfere with the pivot joint in the second arm 3b, and the lower left end portion becomes slender. Therefore, the axis 5 of the second arm 3b
When caulking a to the first blade 2a, the blade 2a tends to be distorted near the caulking part,
In turn, this distortion caused light leakage.

In addition, the pivot point of the second blade was changed to prevent interference with the slit-forming blade, and the left end of the slit-forming blade could be made wider. 57−
The one shown in Publication No. 57367 is known. However, in this conventional example, the third arm (blade support members 6, 10), which is thicker than the blade, is overlapped and pivotally mounted on the second arm (operation auxiliary members 5, 9). There was a drawback that the thickness of the shutter unit increased by the thickness of the third arm.

[Purpose of invention]

The purpose of this invention is to reduce the thickness of the first blade (for slit formation) without increasing the thickness of the shutter unit.
It is an object of the present invention to provide a blade support structure for a focal plane shutter for a camera in which the left end portion of the blade, that is, the vicinity of the caulking portion with respect to the arm can be formed wide.

[Summary of the idea]

An object of the present invention is to provide a focal plane shutter for a camera that includes a substrate, a first blade for forming a slit for opening and closing an aperture, and a second blade adjacent to the first blade. a group of at least one light-shielding blade; one end of the first blade is pivotally attached to the substrate, and the first blade is attached at different locations in order from the tip of the other end toward the pivoting portion with the substrate;
a first arm that is pivotally attached as a second blade and a light-shielding blade other than the second blade; one end is pivoted to the substrate, and the first arm is pivoted to the tip of the other end; and a second arm, on which a light shielding blade other than the second blade is pivotally attached, forming a parallel link with the first arm, and a position beyond the second arm when viewed from the first arm. and a third arm, which has the second blade pivotally attached to one end and at least one of the light shielding blades other than the second blade to the other end, and which forms a parallel link with the first arm. The first blade for forming the slit is widened in the vicinity of the pivot joint of the second blade to prevent it from interfering with the pivot joint of the second blade. This is achieved by making it possible to form

[Example of idea]

Hereinafter, an embodiment of the present invention will be described based on FIG. 2 of the drawings. Note that in order to avoid duplication of explanation, only the parts that are different from the conventional example will be explained.

3c is a third arm, which is located beyond the second arm 3b when viewed from the first arm 3a, and has pivot points at different locations for the second blade 2b and the third blades 2d, 2c, and 2e. and the first arm 3a
are arranged so as to form parallel links.

With this configuration, in the conventional example, the pivot portion on the second arm 3b of the second blade 2b is
It is removed from the arm 3b and retracted to a position where it does not interfere with the first blade 2a.

Therefore, the left end of the first blade 2a near where the shaft 5a of the second arm 3b is caulked can be formed wide.

On the other hand, the third arm 3c is thicker than the blade, but is not pivoted on the arm, and is located between the second blade 2b and the third blade 2d (the lower surface of the blade 2b and the upper surface of the blade 2d). ), so the shutter unit does not have to be thick.

[Effect of idea]

As described above, according to the blade support structure of a focal plane shutter for a camera according to the present invention, the third arm is provided, and one of the second blades is pivoted to the other blade through the third arm. The pivoting part of the second blade is connected to the light-shielding blade so that it does not interfere with the first blade, which is used for forming slits, so that the first blade can be connected to the light-shielding blade without increasing the thickness of the shutter unit. In this case, the end portion near where the axis of the arm is caulked can be formed wide, and even when the axis is caulked, it is difficult to cause distortion, and there is no risk of light leakage.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a plan view showing a conventional example. 1...Substrate, 2a-2e...Blade, 3a-
3c...Arm.

Claims (1)

[Claims for Utility Model Registration] A substrate, a first blade for forming a slit for opening and closing an aperture, and two or more light-shielding blades including a second blade adjacent to the first blade. a group, one end of which is pivotally connected to the substrate, and the first blade, the second blade, and the second blade that are connected to the substrate at different locations in order from the tip of the other end toward the pivot point with the substrate; a first arm pivotally attached to the light-shielding blade, one end of which is pivotally attached to the substrate, and the first arm pivoted to the tip of the other end, and a light-shielding blade that excludes the light-shielding blade; a second arm to which the blade is pivotally connected and which constitutes a parallel link with the first arm; and a second arm having the second blade at one end at a position beyond the second arm when viewed from the first arm. A camera comprising: a third arm that is pivotally attached to the first arm; at least one light-shielding blade other than the second blade is pivotably attached to the other end; and a third arm that forms a parallel link with the first arm; Blade support structure for focal plane shutters.