Patent
1975-10-29
1976-11-02
Peters, Jr., Joseph F.
354 51, 354 60R, G03B 934, G03B 958
Patent
active
039900894
ABSTRACT:
The controller of this invention is an electro-mechanical arrangement for controlling the operation of a camera shutter of the focal plane type. An electromagnet in the controller serves as a transducer between electrical and mechanical portions. The electrical portion includes switching circuitry that operates in either a first or a second mode depending upon how long an exposure interval is required. A key feature involved in the second mode is that the switching circuitry provides energization current to the electromagnet for first and second sub-intervals separated by a power-saving interval during which the electromagnet is deenergized. The mechanical portion is arranged so that the follower curtain of the shutter is released in accordance with either first or second disengageable stop means depending upon which mode the switching circuit operates in.
REFERENCES:
patent: 3688674 (1972-09-01), Kuramoto et al.
patent: 3821757 (1974-06-01), Kobori
patent: 3882511 (1975-05-01), Tsujimoto et al.
patent: 3900857 (1975-08-01), Tsujimoto et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Peters Jr. Joseph F.
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