Auto-focus apparatus in a camera

Details Auto-focus apparatus in a camera Auto-focus apparatus in a camera

1987-12-24

1988-12-20

Perkey, W. B.

354409, G03B 300

Patent

active

047928212

ABSTRACT:
This specification discloses an auto-focus apparatus for repetitively effecting focus detection and in-focus judgement and lens driving, and in particular an auto-focus apparatus designed such that in a case where the lens cannot be regarded as being in focus as a result of focus detection, when the deviation from the in-focus point is small, lens driving is effected and in-focus is judged to thereby shorten the time until the judgement of in-focus and when the lens driving when the deviation from the in-focus point is small has not been properly effected, the judgement of in-focus when the deviation from the in-focus point is small is inhibited to thereby enable an accurate in-focus judging operation to be accomplished.

REFERENCES:
patent: 4200378 (1980-04-01), Shenk
patent: 4335942 (1982-06-01), Tsunekawa et al.
patent: 4470676 (1984-09-01), Kinoshita et al.
patent: 4538892 (1985-09-01), Sakai et al.
patent: 4545664 (1985-10-01), Sakai et al.
patent: 4588278 (1986-05-01), Horigome
patent: 4593988 (1986-06-01), Akiyama et al.
patent: 4641942 (1987-02-01), Sakai et al.
patent: 4687915 (1987-08-01), Sakai et al.

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