The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 01, 1989
Filed:
Feb. 16, 1988
Hirotsugu Murashima, Yamatotakada, JP;
Satoru Maeda, Hirakata, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
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 4. When a comparator 28 determines that the first focus evaluating value does not reach a predetermined reference value, a in-focus state detecting circuit 24 and a focusing motor control circuit 10 perform an intermittent automatic focusing operating every other field in response to the second focus evaluating value. When the comparator 28 determines that the first focus evaluating value exceeds the perdetermined reference value, the in-focus state detecting circuit 24 and the focusing motor control circuit 10 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.