Focal plane shutter device having shutter blades positioned with

Details Focal plane shutter device having shutter blades positioned with Focal plane shutter device having shutter blades positioned with

1998-03-16

2000-08-22

Gray, David M.

Photography

Camera detail

Shutter

396484, G03B 908

Patent

active

061061654

ABSTRACT:
A focal plane shutter blade device has a front blind, rotated by a front driving arm and a front trailing arm, that covers an aperture of a camera prior to an exposure operation. The front blind includes a front slit forming blade. The front slit forming blade forms an exposure slit during an exposure operation of the camera. The front blind also includes front covering blades that do not form an exposure slit. Front covering blades cover the aperture, while front slit forming blade does not cover the aperture, when the front blind is covering the aperture. A rear slit forming blade has a slit edge that is located between an autofocusing device and a film passage, and is positioned further in a bottom portion direction of the camera than from a top portion of the autofocusing device. A first rotation shaft functions as a center of rotation of the front driving arm and a second rotation shaft functions as a center of rotation of the front trailing arm. A center portion of the aperture is located midway between the first rotation shaft and the second rotation shaft. A third rotation shaft functions as a center of rotation of a rear driving arm that rotates a rear blind, and is positioned in the bottom portion direction of the camera, lower than a lower edge of the aperture.

REFERENCES:
patent: 4294532 (1981-10-01), Nakagawa
patent: 4657366 (1987-04-01), Tanabe et al.
patent: 4963913 (1990-10-01), Shindo et al.
patent: 5546149 (1996-08-01), Nemoto et al.

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