Photographic lens focusing system and method which compensates f

Details Photographic lens focusing system and method which compensates f Photographic lens focusing system and method which compensates f

1997-05-20

1998-12-29

Adams, Russell E.

Photography

With exposure objective focusing means, focusing aid, or...

Lens characteristic compensating

396509, G03B 1322

Patent

active

058549480

ABSTRACT:
A focus setting system for a camera in which a photographer can observe a focused subject image in a viewfinder and which corrects the focus prior to exposure such that a photographed picture is in focus. Specifically, the focusing system corrects for errors introduced by varying apertures. The focusing system has a photographic lens which has a memory for storing focus error data which represents focusing adjustment values from an open aperture to a number of predetermined apertures. A focus detection device detects a focused state of the photographic lens using a portion of the incident light rays of the photographic lens. A first drive unit drives the photographic lens by calculating a focus drive amount which achieves focus at open aperture. The focus drive amount is calculated from the focus error data and the focus state detected by the focus detection device. A second drive unit drives the photographic lens by calculating a second focus drive amount which sets the focus for a predetermined aperture based on the focus error data and the focused state detected by the focus detection device.

REFERENCES:
patent: 4303323 (1981-12-01), Imai et al.
patent: 4344679 (1982-08-01), Yagi et al.
patent: 4473287 (1984-09-01), Fukuhara et al.
patent: 4890133 (1989-12-01), Ogawa et al.

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