Electric driving device

Details Electric driving device Electric driving device

1987-04-07

1988-08-30

Perkey, W. B.

35414911, 3542341, G03B 310, G03B 1505, G03B 908

Patent

active

047680512

ABSTRACT:
A lens driving device for driving a lens for use in adjusting a focus according to a distance therefrom to an object by a pulse motor, comprising; a lens driving section for driving the lens by the pulse motor, a distance measuring section for measuring the distance to the object and generating a distance information for focusing, and a generator for generating a pulse signal for driving the pulse motor, setting a pulse width of the pulse signal to a broad width at starting the pulse motor, changing the pulse width to a narrow width after starting, temporarily interrupting the generation of the pulse signal just before the lens reaches a predetermined stop position determined on the basis of the distance information for focusing generated by the distance measuring section and changing the pulse width to a broad width till the lens reaches the predetermined stop position.

REFERENCES:
patent: 4426145 (1984-01-01), Hashimoto
patent: 4504132 (1985-03-01), Martin et al.
patent: 4634254 (1987-01-01), Ogihara et al.
patent: 4653892 (1987-03-01), Namai et al.
patent: 4671639 (1987-06-01), Kodaira et al.
patent: 4684233 (1987-08-01), Kodaira et al.
patent: 4696559 (1987-09-01), Kondo

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