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:
Aug. 22, 2000
Filed:
Sep. 18, 1998
Masaki Nakano, Tokyo, JP;
Toshiaki Iwanaga, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An optical disk recording device for conducting reading and recording of data through irradiation of laser beam on an optical disk medium comprises a photo detection circuit for receiving input of reflected light from an optical disk medium to detect a reproduced signal, a pre-amplifier for amplifying a reproduced signal from the photo detection circuit and outputting the amplified reproduced signal for monitoring, and a level shift circuit for shifting a level of a reproduced signal from the photo detection circuit increased with an increase of the amount of light in data recording operation to a preset value and outputting the level-shifted reproduced signal to the pre-amplifier.