JPH058592Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention is directed to a focal plane shutter for a camera, more specifically, to prevent collision between a group of shutter blades and one of the arms that pivotally supports the group of shutter blades. This article relates to a focal plane shutter for cameras.

<Prior art and its problems> The applicant has filed a patent application for a focal plane shutter for cameras that makes it possible to reduce the operating stroke of the blade charging member compared to the conventional technology.
No. 60-152837 proposed a shutter blade group in which a group of shutter blades is pivotally connected to a pair of parallel arms of equal length, and each blade is supported by the pair of arms so as to sandwich the blades from the front and back.

The proposed focal plane shutter for cameras is specifically constructed as shown in FIG.

That is, it has an opening 1a and has one end (base part) of a pair of open blade arms 2 and 3 at one end of the back surface.
and a base plate having an opening 4a corresponding to the opening 1a, and having one end (basic section) of a pair of closing blade arms 5, 6 pivoted to one end of the surface. 4, an open blade group 7 consisting of a slit blade 7a and a plurality of light-shielding blades 7b to 7f, which are pivotally connected at two places each to the open blade arms 2 and 3, and an open blade group 7 which is pivotally connected to the closed blade arms 5 and 6 at two places each. The slit blade 8a and the closed blade group 8 are made up of a plurality of light shielding blades 8b to 8f, and the slit blade 7a and the light shielding blades 7b to 7f of the open blade group 7 are sandwiched between the pair of arms 2 and 3 from the front and back. The slit blade 8 of the closed blade group 8 is
a and the light shielding blades 8b to 8f are a pair of arms 5 and 6.
The basic structure is that it is pivoted so that it is sandwiched between the front and back.

In order to reduce the operating stroke of the blade charging member, the pivot point of each blade by the pair of arms 2 and 3 is moved to a position farther from the main pivot point of the arm as it approaches the slit blade 7a. Then, each blade is set at a position moved from the end of the arm on the side of the main pivot part to the end on the opposite side.

As a result, when viewed from the open blade group 7, arm 2,
The pivot parts 2a, 3a of the slit blade 7a according to No. 3 are located slightly to the right of the middle, and are pivoted close to the blades 7a, 7b, 7c, . . . with respect to the arm 2. 7a to 7c, during the opening operation, the ends of the arms 2 and 3 on the side of the main pivot part swing in a direction perpendicular to the plane of the paper and slip into the side of the pivot part opposite to each blade of arm 2. As such, there was a drawback that the blade collided with the end surface 2z of the arm 2 in the thickness direction, and the blade was destroyed.

Further, in the closing blade group 8, the above-mentioned phenomenon occurs during the charging operation.

<Purpose of the Invention> An object of the present invention is to provide a focal-brain shutter for a camera that prevents a collision between a group of shutter blades and an arm that pivotally supports the shutter blades.

<Summary of the invention> The object of the invention is to pivotally attach a shutter blade group consisting of a slit blade and a plurality of light-shielding blades to a pair of parallel arms of equal length, and to sandwich each blade from the front and back between the pair of arms. In a focal plane shutter for a camera, the shutter blade group is supported in the direction in which the shutter blade group is folded, and the arm on the side that approaches the slit blade and the adjacent light shielding blade in this order, and the arm in the blade group. This is achieved by arranging a partition plate between the end portion on the main body side.

<Embodiment of the invention> Hereinafter, an embodiment of the invention will be described based on FIG. 1. Parts that overlap with those described above are given the same reference numerals, and a description thereof will be omitted.

In FIG. 1, 9 is a partition plate, and when the open blade group 7 is folded in the open blade system,
Between the arm 2 which is pivotally supported so that the slit blade 7a and the light shielding blades 7b to 7f are adjacent to each other in this order, and the end of the arm in the open blade group 7 on the side of the main pivot part, there is also a closing blade. In the system, when the closing blade group 8 is folded up, the arm 5 is pivotally supported so that the slit blade 8a and the light shielding blades 8b to 8f are adjacent in this order, and the main pivot of the arm in the closing blade group 8. They are arranged between the end portion of the section and the end portion of the section.

Therefore, when the open blade group 7 is folded by the opening operation, or when the closed blade group 8 is folded by the charge operation, the above-mentioned ends of each of the above-mentioned end portions have a restricted operating area and are not connected to the arm. 2 or arm 5
There is no collision with the end face in the thickness direction of the blade, and destruction of the blade is prevented.

Note that the partition plate 9 may be provided separately for the open blade system and the closed blade system.

<Effects of the Invention> As described above, according to the present invention, there is no collision between the shutter blade group and the arm that pivotally supports it, and destruction of the blades is prevented, so the practical value is extremely high.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional example. 2, 3, 5, 6... Arm, 7... Open blade group, 8... Closed blade group, 9... Partition plate.

Claims (1)

[Claim for Utility Model Registration] A shutter blade group consisting of a slit blade and a plurality of light-shielding blades is pivotally attached to a pair of parallel arms of equal length,
Further, in the focal plane shutter for a camera, in which each of the blades is supported by the pair of arms so as to sandwich the blades from the front and back, the shutter blade group is arranged close to the slit blade and the light shielding blade adjacent thereto in the order of the folding direction. In order to prevent the end of the blade group from slipping into the side of the arm opposite to the pivot joint between the arm on the side that is pivoted and the end of the arm on the side of the main pivot joint of the blade group. A focal plane shutter for a camera, characterized in that a partition plate is arranged.