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. 08, 1988
Filed:
Sep. 04, 1985
Hiromichi Ishibashi, Toyonaka, JP;
Masaharu Imura, Moriguchi, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
An optical storage medium drive apparatus having a light beam source for recording information on an optical storage medium and reading out the recorded information from the storage medium by using a light beam. The apparatus has an optical head in which the light source is included for emitting a light beam, and a light detector for converting reflected light from the storage medium into an electric signal and an optical system for guiding the light beam from the light source to the optical storage medium and a reflected light beam from the optical storage medium to the light detector. The optical system has therein a light reflector for changing the direction of the light beam and which causes retardation of the light. An optical phase compensator is disposed on the optical path between the optical head and the optical storage medium for compensating for retardation of the light beam caused by the reflector.