Lens control apparatus

Details Lens control apparatus Lens control apparatus

1999-03-15

2000-09-12

Perkey, W. B.

Photography

Having variable focal length of camera objective

Having focus operation

396 90, 396136, 348345, 348358, 318696, G03B 1336, G03B 1700, H02P 826

Patent

active

061189456

ABSTRACT:
A lens control apparatus drives a lens with a sine wave by means of a pulse motor and detects the position of the lens by counting the number of pulses during the driving of the pulse motor, and stores a stop phase which is reached by a rotor when the pulse motor is brought to a driving-stopped state. When the lens control apparatus is to move the lens to an initial position and initialize a counter for detecting the position of the lens, the lens control apparatus corrects the count value of the counter by using information indicative of the stored stop phase of the rotor.

REFERENCES:
patent: 4743931 (1988-05-01), Matsuzaki et al.
patent: 5424776 (1995-06-01), Hirasawa
patent: 5446358 (1995-08-01), Nakata
patent: 5448295 (1995-09-01), Hirota
patent: 5594311 (1997-01-01), Yasuda et al.
patent: 5982134 (1999-11-01), Tanaka

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