Patent
1975-05-15
1977-05-17
Hix, L. T.
354258, 354268, G03B 934
Patent
active
040245535
ABSTRACT:
An electrical focal plane shutter is provided of a type in which subsequent to a running of a first blind of the shutter, a second blind of the shutter is constrained from movement by an electromagnet until a desired exposure period passes, whereupon the electromagnet is deenergized to permit a running of the second blind. The electromagnet is controlled by an electromagnet control device including a light receiving element which is used for photometry. The shutter includes a shutter detent mechanism for preventing a shutter release operation when an electric storage battery contained in an associated camera is exhausted. The shutter further includes a high speed shutter operation control mechanism which assures against the instability of the operation of the electromagnet when the shutter is operating at a high speed, and also includes a manual shutter control mechanism for establishing a shutter operation period of a given length in a purely mechanical manner.
REFERENCES:
patent: 2758526 (1956-08-01), McFadden
patent: 3657982 (1972-04-01), Uno et al.
patent: 3821757 (1974-06-01), Kobori
patent: 3829877 (1974-08-01), Kitai
patent: 3875580 (1975-04-01), Watanabe et al.
patent: 3930263 (1975-12-01), Urano
Enomoto Fujio
Hashimoto Akihiko
Maitani Yoshihisa
Hix L. T,.
LaBarre J. A.
Olympus Optical Co,. Ltd.
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