Position controlling device in a lens driving apparatus for came

Details Position controlling device in a lens driving apparatus for came Position controlling device in a lens driving apparatus for came

1987-12-03

1989-08-15

Perkey, W. B.

354400, 35419512, G03B 500, G03B 310

Patent

active

048579475

ABSTRACT:
A camera is capable of displacing a phototaking optical system in the direction of the optical axis by a drive source such as motor and setting the optical system to a plurality of positions. The camera includes a photo-taking optical system, photographing position setting means producing a command signal, a drive source, position detecting means outputting a position signal corresponding to the position of the photo-taking optical system, discriminating means for discriminating the direction of movement of the phototaking optical system, and control means for stopping the drive source and setting the photo-taking optical system at a position corresponding to the command signal as soon as the position indicated by the position signal coincides with the position indicated by the command signal when the discriminating means is discriminating a predetermined first direction of movement, stopping the drive source at a position beyond the position indicated by the command signal and then driving the drive source so that the photo-taking optical system is moved in the first direction when the disciminating means is discriminating a second direction of movement differing from the first direction of movement, and stopping the drive source and setting the photo-taking optical system at the position corresponding to the command signal as soon as the position indicated by the position signal coincides with the position indicated by the command signal.

REFERENCES:
patent: 3816651 (1974-07-01), Gardner
patent: 4238143 (1980-12-01), Shenk
patent: 4508443 (1985-04-01), Matsuzaki et al.
patent: 4537487 (1985-08-01), Taniguchi et al.
patent: 4597657 (1986-07-01), Wakabayashi
patent: 4643555 (1987-02-01), Wakabayashi
patent: 4669848 (1987-06-01), Wakabayashi

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