Automatic focusing apparatus

Details Automatic focusing apparatus Automatic focusing apparatus

1991-05-17

1993-02-23

Gellner, Michael L.

3541951, G03B 1336

Patent

active

051894599

ABSTRACT:
An automatic focusing apparatus includes a focus detection unit for repeatedly calculating the amount of defocus corresponding to the difference between a surface of a subject image imaged by a taking optical system and a prospective image surface of this system, an image surface speed calculation unit for calculating the speed at which the subject image surface is moved with the movement of the subject based on the amounts of defocus calculated at different times, and a drive control unit for driving and controlling the taking optical system based on the amount of defocus and the subject image surface moving speed calculated. A time information calculation unit calculates time information indicating the time when the surface of the subject image imaged by the taking optical system driven and controlled by the drive control unit will coincide with the prospective image surface based on the amount of defocus and the image surface moving speed calculated, and a shutter release control unit starts, based on this time information, the operation of a shutter release mechanism by a timing such that exposure is effected when the subject image surface coincides with the prospective image surface.

REFERENCES:
patent: 4972221 (1990-11-01), Ohnuki et al.
patent: 5005037 (1991-04-01), Akashi et al.
patent: 5040015 (1991-08-01), Hamada et al.

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