Motor driven shutter activated by single motor having controllab

Details Motor driven shutter activated by single motor having controllab Motor driven shutter activated by single motor having controllab

1993-06-28

1995-05-30

Blankenship, Howard B.

354439, 354440, 3542341, G03B 700, G03B 908

Patent

active

054206600

ABSTRACT:
A motor driven shutter is activated by a single motor whose clockwise and counterclockwise rotations may be controlled. The motor driven shutter includes a driving member whose clockwise and counterclockwise rotations are controlled by the motor and having first and second control portions. An opening member is activated by the first control portion; and an opening spring biases the opening member in the direction of opening the shutter. A first electromagnet controls the activation timing of the opening member and resists the bias of the opening spring. A closing member is activated by the second control portion; and a closing spring biases the closing member in the direction of closing the shutter. A second electromagnet constrains the activation timing of the closing member and resists the bias of the closing spring. A selecting circuit selects excitation and demagnetization of the first and second electromagnets, the selecting circuit controlling a plural time excitation or demagnetization of the first and second electromagnets to carry out shutter opening and closing operations by the opening member and the closing member.

REFERENCES:
patent: 4724455 (1988-02-01), Suzuki et al.
patent: 4974006 (1990-11-01), Shinozaki et al.
patent: 5060000 (1991-10-01), Ogihara et al.
patent: 5121154 (1992-06-01), Yamada et al.
patent: 5202721 (1993-04-01), Kobayashi et al.

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