Focal point correction apparatus

Details Focal point correction apparatus Focal point correction apparatus

1994-11-09

1996-08-27

Perkey, W. B.

G03B 1336

Patent

active

055506127

ABSTRACT:
A camera equipped with a focal point correction apparatus has a camera body including a film loading portion, a position detecting mechanism, an optical system including a picture taking lens, a shutter, a lens driving mechanism, a pressure plate, a light measuring device, a distance measuring device, a memory, a shutter driving mechanism, a release switch, and a control unit. The position detecting mechanism has a light projecting unit and a light receiving unit and is used to measure the position of the light-sensitive surface of the film in the direction of the optical axis. The focal point correction apparatus includes the position detecting mechanism, the optical system, the memory and the control unit. When a photograph is taken, focal point correction is carried out by determining a correction value for correcting the extension setting of the picture taking lens based on measurements of the position of the film carried out by the position detecting mechanism.

REFERENCES:
patent: 3639048 (1972-02-01), Heaney et al.
patent: 4714331 (1987-12-01), Oda et al.
patent: 4987436 (1991-01-01), Misawa

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