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:
Jan. 03, 1995
Filed:
Apr. 25, 1994
Moritoshi Miyamoto, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical information recording-reproducing apparatus comprising a light source, which produces a recording light beam. The apparatus further comprises, a light source producing a reproducing light beam differing in wavelength from the recording light beam, a detecting optical system for detecting a light beam passed through a recording medium, and a beam shaping prism for shaping the light beams of the two light sources into predetermined intensity distributions, the beam shaping prism being constructed of a division prism comprising at least three prisms cemented together, a polarization dividing surface for transmitting the light beams from the light sources therethrough and reflecting the reflected light from the recording medium being formed on at least one of the dividing surfaces of the division prism, and a wavelength dividing surface for directing the reproducing light beam of the reflected light from the recording medium being formed on at least one other dividing surface.