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. 13, 1990
Filed:
Apr. 21, 1988
Hiroshi Hara, Yokohama, JP;
Hiraku Sonobe, Yokohama, JP;
Makoto Shihou, Yokohama, JP;
Osamu Koyama, Hachioji, JP;
Masamichi Tateoka, Yokohama, JP;
Koichi Ida, Tokyo, JP;
Hideaki Yano, Kokubunji, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In an optical pickup apparatus comprising a light source for applying a light beam to an optical memory medium, a beam splitter disposed in the optical path from the light source to the medium to separate the reflected beam from the medium from the beam from the light source, and a photodetector for detecting the separated reflected beam, having a surface opposed to that surface of the beam splitter which faces the photodetector is formed so as to form an angle different from the perpendicular with respect to the optic axis of the separated reflected beam.