H - Electricity – 04 – N
Patent
H - Electricity
04
N
341/97
H04N 5/232 (2006.01) G02B 7/09 (2006.01) G02B 7/28 (2006.01) G02B 7/40 (2006.01)
Patent
CA 1293790
ABSTRACT OF THE DISCLOSURE In an automatic focusing circuit of a video camera, an automatic focusing operation is performed in response to a first focus evaluating value which is steeply changed and a second focus evaluating value which is gently changed, in response to the position of a lens in which the first and second focus evaluation values are generated in response to a video signal obtained in an image sensing circuit. When a comparator determines that the first focus evaluating value does not reach a predetermined reference value, an in-focus state detecting circuit and a focusing motor control circuit perform an intermittent automatic focusing operating every other field in response to the second focus evaluating value. When the comparator determines that the first focus evaluating value exceeds the predetermined reference value, the in-focus state detecting circuit and the focusing motor control circuit perform an automatic focusing operation more frequently every field in response to the first focus evaluating value. The moment a change of an object is detected after the object is in focus, the automatic focusing operation is resumed in response to the second focus evaluating value.
559104
Maeda Satoru
Murashima Hirotsugu
G. Ronald Bell & Associates
Sanyo Electric Co. Ltd.
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