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:
Mar. 31, 1987
Filed:
Aug. 10, 1984
Kiyonobu Endo, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In an optical head for effecting the recording of information onto a recording medium or the reproduction of information from the recording medium, a light beam supplied from a light source unit is directed to the recording medium by a first optical system, the light beam from the recording medium is divided into two light beams by a light divider in a second optical system and the two light beams are directed to photodetectors by the second optical system, and even if the light beam entering the light divider is displaced by tracking, the quantities of light of the two divided light beams are not varied, whereby the influence of the tracking operation on auto focusing is eliminated.