Automatic focusing apparatus for moving objects

Details Automatic focusing apparatus for moving objects Automatic focusing apparatus for moving objects

1994-12-29

1995-09-05

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354402, G03B 1336

Patent

active

054480515

ABSTRACT:
An automatic focusing apparatus comprises an object speed calculating device for calculating a moving speed of object image plane, based on a defocus amount detected by a focus detecting device and a detection time interval measured by a time counting device, a speed control device for outputting to a driving device a speed command value for equalizing an image plane moving speed of photo-taking lens to the moving speed of object image plane, a speed correcting device for correcting the speed command value output from the speed control device in accordance with the defocus amount detected by the focus detecting device, and the driving device for driving the photo-taking lens in accordance with the speed command value, whereby the photo-taking lens smoothly pursues the moving object in the in-focus state.

REFERENCES:
patent: 5060002 (1991-10-01), Ohnuki et al.
patent: 5177525 (1993-01-01), Ogasawara
patent: 5270763 (1993-12-01), Ogasawara

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