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:
Nov. 08, 1983
Filed:
Nov. 18, 1981
Manabu Yamamoto, Odawara, JP;
Shuhei Tanaka, Musashimurayama, JP;
Hitachi Denshi Kabushiki Kaisha, Tokyo, JP;
Abstract
In an autofocus system in which the image definition of an object to be picked up is detected by image sensor means disposed on a light path of an image-forming optical system and converted into electric signals, and the image-forming position of the image-forming optical system is controlled by using the electric signals, a plurality of electric signals representative of image definitions are obtained from a main image sensor and at least one sub-image sensor which are provided at optically different positions on the light path and subjected to a predetermined logical judgement processing to produce a focus control signal. The position of the image-forming optical system is controlled by the focus control signal. When the sub-image sensor is movably supported and the light path length between the image-forming optical system and the sub-image sensor is varied by changing the position of the sub-image sensor, a signal representative of the position of the sub-image sensor is also subjected to a predetermined logical judgement processing and used for controlling the position of the sub-image sensor.