Focusing device of a camera

Details Focusing device of a camera Focusing device of a camera

1989-05-16

1991-01-01

Adams, Russell E.

354167, G03B 1336

Patent

active

049822160

ABSTRACT:
There is disclosed a device for correcting and compensating variations of the back focal length caused by temperature changes in a photographic lens system which incorporates at least one lens component made of a plastic material. The device includes a lens drive which axially moves the lens system to obtain a fully focused image of an object to be photographed, and a temperature sensor which senses surrounding temperature conditions and produces output signals representing the sensed temperature condition. A lens control is also provided in the device, and functions in response to the output signals from the temperature sensor to control the lens drive in a manner to compensates any temperature-related variation of the back focal length of the lens system.

REFERENCES:
patent: 4479706 (1984-10-01), Takahashi
patent: 4533227 (1985-08-01), Takahashi
patent: 4650309 (1987-03-01), Ishida et al.
patent: 4662735 (1987-05-01), Karasaki et al.
patent: 4772912 (1988-09-01), Ishida et al.
patent: 4828383 (1989-05-01), Kunishige et al.

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