Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1975-12-01
1978-05-30
Hix, L. T.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351258, G03B 908, G03B 962
Patent
active
040926575
ABSTRACT:
An electrically operated shutter in which an exposure aperture is opened by actuation of a shutter blade opening member and closed by actuation of a shutter blade closing member and exposure time is controlled in accordance with the duration of excitation of an electromagnet. The shutter is comprised of a disengaging member for causing said shutter blade closing member to actuate upon being attracted to the electromagnet during excitation thereof, and an engaging member for causing the shutter blade opening member to actuate upon being actuated by the movement of a control member if the shutter is released. When the electromagnet is not normally energized, the disengaging member is engaged by a cam portion of the engaging member on the initial operating period of shutter release and disengaged upon lapse of a preselected time from the shutter opening operation.
REFERENCES:
patent: 3777646 (1973-12-01), Shimizu
patent: 3829877 (1974-08-01), Kitai
patent: 3847475 (1974-11-01), Kitai et al.
patent: 3927416 (1975-12-01), Inoue
Koyama Mitsuo
Nakagawa Tadashi
Onda Eiichi
Adams Bruce L.
Burns Robert E.
Gellner M. L.
Hix L. T,.
Lobato Emmanuel J.
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