Automatic focusing circuit for automatically matching focus in r

Details Automatic focusing circuit for automatically matching focus in r Automatic focusing circuit for automatically matching focus in r

1988-12-09

1990-02-20

NG, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358225, H04N 5232

Patent

active

049031341

ABSTRACT:
In an automatic focusing circuit of a video camera, automatic focusing operation is performed by a focus evaluating value formed in response to a video signal obtained by an image sensing circuit (4). A first focusing motor control circuit (15) controls the rotation of a focusing motor (3) so that a focusing lens (1) is once fixed in the position where the focus evaluating value takes the maximum value. A second focusing motor control circuit (17) changes the focusing motor (3), by a predetermined very small amount, to determine the slope of the focus evaluating value, which change is repeated until inversion of the slope, that is, the maximal point is detected. As a result, the position of the focusing lens is corrected at the maximal point of the focus evaluating value. When the correction amount exceeds a predetermined value, first automatic focusing operation by the first focusing motor control circuit (15) is resumed.

REFERENCES:
patent: 4161756 (1979-07-01), Thomas
patent: 4735494 (1988-04-01), Makino et al.

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