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:
Sep. 24, 1996
Filed:
Feb. 14, 1994
Junichi Takeda, Inagi, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An information recording and/or reproducing apparatus has an auto gain controller for controlling the amplitude level of a reproduction signal read out from a recording medium to a predetermined level. The auto gain controller has a variable gain amplifier for amplifying the reproduction signal, a converter for converting the output of the variable gain amplifier into a DC voltage, and a comparator for comparing the output from the converter with a predetermined reference value and sending the result of the comparison to the variable gain amplifier. The controller also includes a fixing device for fixing the gain of the variable gain amplifier, and a focusing offset for applying an adjuster offset to a focusing servo loop when the gain is fixed by the fixing device, and introducing the output of the converter thereinto while varying the amount of the applied offset, thereby effecting the adjustment of the focusing offset.