Lens drive control apparatus for automatic focusing

Details Lens drive control apparatus for automatic focusing Lens drive control apparatus for automatic focusing

1987-03-23

1988-09-20

Adams, Russell E.

354402, 354286, G03B 300

Patent

active

047729090

ABSTRACT:
In an automatic focusing apparatus, wherein first zone representing an in-focus condition and a second zone for sufficiently assuring detection precision of the automatic focusing apparatus are provided for the position of a focusing lens, the focusing lens is driven on the basis of a defocus amount when the defocus amount falls within the range between the first and second zones, and thereafter an in-focus signal is output upon driving of the focusing lens, thereby shortening a delay time from the end of driving of the photographing lens to generation of the in-focus signal.

REFERENCES:
patent: 4460257 (1984-07-01), Ogasawara
patent: 4477167 (1984-10-01), Ishikawa et al.
patent: 4482235 (1984-11-01), Yasukawa et al.
patent: 4483603 (1984-11-01), Metabi et al.
patent: 4496229 (1985-01-01), Ogasawara
patent: 4509842 (1985-04-01), Taniguchi et al.
patent: 4550994 (1985-11-01), Maruyama
patent: 4613224 (1986-09-01), Ogasawara

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