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:
Nov. 13, 2001
Filed:
Jun. 30, 1999
Naoharu Yanagawa, Tokorozawa, JP;
Shinichi Nagahara, Tokorozawa, JP;
Pioneer Electronic Corporation, Tokyo-to, JP;
Abstract
An optical pickup apparatus is provided with: a light source (,) for emitting a light beam; an optical system (,), which comprises an optical element (,) having an incident surface (,), to which an AR (Anti-Reflection) coat is not applied and to which the light beam emitted from the light source is inputted obliquely by a predetermined incident angle, for guiding one portion of the emitted light beam transmitted through the incident surface onto an information record medium (,) and guiding a reflection light of one portion of the emitted light beam reflected from the information record medium, and also reflecting another portion of the emitted light beam by the incident surface; a main light detector (,) for receiving the reflection light from the information record medium guided by the optical system and outputting a main detection signal corresponding to record information recorded on the information record medium; a monitor detector (,) for receiving another portion of the emitted light beam reflected by the incident surface of the optical element and outputting a monitor detection signal corresponding to a light amount received by the monitor detector; and a controlling device (,) for controlling an output power of the light beam emitted from the light source on the basis of the monitor detection signal.