Lens motor drive device in automatic focusing camera

Details Lens motor drive device in automatic focusing camera Lens motor drive device in automatic focusing camera

1982-03-09

1984-02-21

Gellner, Michael L.

G03B 310

Patent

active

044326203

ABSTRACT:
A lens motor drive in an automatic focusing camera, in which current corresponding to a degree of focalization of an optical system is supplied to a lens motor in which there is provided a signal forming circuit performing a focalization signal representing the focalization of the optical system, and a focalization deviation signal having a level corresponding to a degree of focalization of the optical system. In addition, there is provided a limiting circuit for providing an output when the level of said focalization signal decreases to an extent that the lens motor cannot continue rotation, and a timing circuit for providing an output when the limiting circuit provides the output for a predetermined period of time. A start pulse generating circuit is also provided for generating a start pulse having a duration long enough to start the lens motor when the output of the timing circuit is provided under the condition that there is an absence of the focalization signal.

REFERENCES:
patent: 4031383 (1977-06-01), Hosoe et al.
patent: 4357085 (1982-11-01), Niwa et al.

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