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. 16, 1993
Filed:
May. 11, 1992
Masayuki Usui, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Disclosed is a device for reproducing information from an information recording medium having, on its information recording surface, a surface layer transmitting light therethrough. The information reproducing device includes a light source generating an illuminating light beam, a photodetector for receiving light from the information recording medium illuminated by the light beam from the light source, information reproduction being effected by the result of the detection by the photodetector, and an illuminating optical system for condensing the light beam from the light source and for directing it onto the information recording medium, the position of the condensing point by the illuminating optical system being spaced apart from the information recording surface of the information recording medium during the information reproduction by the detection by the photodetector.