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. 12, 2002
Filed:
Nov. 02, 2000
Makoto Kawamura, Tokorozawa, JP;
Shinichi Takahashi, Tokorozawa, JP;
Hirokatsu Nagatake, Tokorozawa, JP;
Aki Yoshioka, Tokorozawa, JP;
Mitsutoshi Sugano, Tokorozawa, JP;
Ko Ishii, Tokorozawa, JP;
Akira Miura, Tokorozawa, JP;
Masayuki Koyama, Tokorozawa, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
An optical pickup apparatus which supports two wavelengths and is amenable to a reduction in size without employing a combining prism. The optical pickup apparatus employs a semiconductor laser device implemented in the form of a one-chip laser diode having two light sources for emitting a first laser beam and a second laser beam at a wavelength different from that of the first laser beam. A photodetector unit has a first detector section for receiving the first laser beam and a second detector section for receiving the second laser beam, and is set at positions at which the first and second laser beams follow return light paths of different lengths from an optical disc to the first and second detector sections.