1992-05-29
1993-11-23
Adams, Russell E.
354402, G03B 1336
Patent
active
052648931
ABSTRACT:
An auto focus camera measures the distance to a subject by switching the distance measuring mode according to the moving speed of the subject to provide a picture with a small time lag for a moving subject and to ensure highly accurate photographic for a still subject. In this auto focus camera, a moving object detecting section outputs a signal corresponding to the moving speed of the subject is output in accordance with an operation prior to the release action of first and second release switches, and a CPU determines whether the moving speed is higher or lower than a predetermined value in accordance with the manipulation to instruct that release action. When the discrimination result indicates that the moving speed is slow, a first distance measuring section measures the distance to the subject. When the discrimination result indicates that the moving speed is fast, distance measurement is performed by a second distance measuring section which completes distance measurement in a shorter period of time than the first distance measuring section. The selection of the proper distance measuring section drives a lens adjusting section to control the focal point of a photographic lens.
REFERENCES:
patent: 4816856 (1989-03-01), Hamada et al.
patent: 4959678 (1990-09-01), Nakagawa
patent: 5051766 (1991-09-01), Nonaka et al.
patent: 5060003 (1991-10-01), Kotani et al.
patent: 5136148 (1992-08-01), Nonaka
Adams Russell E.
Olympus Optical Co,. Ltd.
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