Lens focus control apparatus

Details Lens focus control apparatus Lens focus control apparatus

1994-02-04

1996-04-09

Adams, Russell E.

35419513, G03B 1336

Patent

active

055066542

ABSTRACT:
A lens focus control apparatus and method for use in a camera optical system and which is manually manipulated by a user, includes a lens position detector for detecting current positions of a focus lens and a zoom lens, a memory for storing a movable region value of the focus lens, a current position value of the focus lens and a contrast ratio value therein, and a display. The display indicates the current position of the focus lens, the range of movement of the focus lens, and the movement direction in the movable region of the focus lens. A microcomputer controls the above elements to adjust an exact focus and to display an exact focus direction using the contrast ratio value.

REFERENCES:
patent: 3486432 (1969-12-01), Norwood
patent: 3820129 (1974-06-01), Hosoe et al.
patent: 4264160 (1981-04-01), Aoki
patent: 4319238 (1982-03-01), Ogasawara et al.
patent: 4322141 (1982-03-01), Tominaga et al.
patent: 4364648 (1982-12-01), Kitai et al.
patent: 4367934 (1983-01-01), Matsui
patent: 4595272 (1986-06-01), Wilwerding

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