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:
Apr. 23, 2013
Filed:
Mar. 16, 2012
Hisayoshi Uchiyama, Gunma-ken, JP;
Masashi Arai, Gunma-ken, JP;
Hiroshi Kojima, Gunma-ken, JP;
Rui Kurihara, Saitama-ken, JP;
Hisayoshi Uchiyama, Gunma-ken, JP;
Masashi Arai, Gunma-ken, JP;
Hiroshi Kojima, Gunma-ken, JP;
Rui Kurihara, Saitama-ken, JP;
Semiconductor Components Industries, LLC, Phoenix, AZ (US);
Abstract
An optical-pickup apparatus includes: a first laser light source including a first laser diode to emit a laser beam having a first wavelength, and a back-monitor photodetector to receive the laser beam emitted in a backward direction, not being an optical-disc direction, and output a first monitor signal; a second laser-light source including a second laser diode to emit a laser beam having a second wavelength; a light-receiving circuit including a front-monitor photodetector to receive the laser beam emitted in a forward direction, being the optical-disc direction, and output a second monitor signal, and a switch circuit to be inputted with the first and second monitor signals, and output the first or second monitor signal according to a switch signal; and first and second drive circuits to drive the first and second laser diodes according to the first and second monitor signals outputted from the light-receiving circuit, respectively.