Focus adjustment device having restricting means for restricting

Details Focus adjustment device having restricting means for restricting Focus adjustment device having restricting means for restricting

1991-11-25

1992-09-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354406, G01J 120

Patent

active

051515830

ABSTRACT:
A focus adjustment device arranged to measure distances at a plurality of points on a picture plane specified by an optical means to be focus-adjusted and to adjust focus of the optical means on the basis of the results of distance measurement includes: selecting circuitry for selecting information on the nearest of measured distances obtained at the plurality of points, and restricting circuitry for restricting a selecting action of the selecting circuitry according to the nearness degree of the nearest distance in relation to the focal length of the optical means, the position of the distance measuring point on the picture plane, etc.

REFERENCES:
patent: 4080531 (1978-03-01), Stauffer
patent: 4257705 (1981-03-01), Hosoe et al.
patent: 4687915 (1987-08-01), Sakai et al.
patent: 4688919 (1987-08-01), Ogawa et al.
patent: 4843227 (1989-06-01), Matsui et al.
patent: 4943824 (1990-07-01), Nabeshima et al.

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