Automatic focusing device using a plurality of different frequen

Details Automatic focusing device using a plurality of different frequen Automatic focusing device using a plurality of different frequen

1994-09-20

1998-04-14

Shalwala, Bipin

Television

Camera, system and detail

Optics

348353, G03B 1300, H04N 5232

Patent

active

057398585

ABSTRACT:
Disclosed herein is an automatic focusing device including a plurality of extraction means for extracting different frequency components from among image pickup signals outputted by image pickup means, driving direction decision means for deciding the driving direction of a focusing lens based on the signal extracted by the extraction means, detection means for detecting a focusing signal in correspondence with the degree of focusing by dividing a signal at the same point which is extracted by the extraction means, driving speed decision means for deciding the driving speed of the focusing lens based on the detection means, and driving means for driving the focusing lens of optical system to the focusing point based on the driving direction decision means and the driving speed decision means.

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