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. 29, 2011
Filed:
Apr. 28, 2008
Fumitomo Yamasaki, Nara, JP;
Yoshiaki Komma, Osaka, JP;
Toshiyasu Tanaka, Osaka, JP;
Yohichi Saitoh, Kyoto, JP;
Fumitomo Yamasaki, Nara, JP;
Yoshiaki Komma, Osaka, JP;
Toshiyasu Tanaka, Osaka, JP;
Yohichi Saitoh, Kyoto, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An optical head is provided with a light source for outputting laser light having a wavelength of 430 nm or less; an objective lens for collecting the laser light outputted from the light source to an optical disc having a plurality of information recording surfaces; a light receiving element for receiving laser light reflected on the optical disc; and a detecting lens for guiding the laser light reflected on the optical disc to the light receiving element. The detecting lens is formed of a resin material. The detecting lens is arranged so that a light collecting position of the laser light reflected on an information recording surface different from an information recording surface having a thinnest protection substrate, among the information recording surfaces, is outside the detecting lens, at the time of recording or reproducing information on or from the information recording surface having the thinnest protection substrate.