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:
Oct. 09, 2007
Filed:
Feb. 20, 2003
Takashi Kobayashi, Kanagawa, JP;
Tadashi Taniguchi, Kanagawa, JP;
Takashi Kobayashi, Kanagawa, JP;
Tadashi Taniguchi, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
The present invention relates to an optical pickup and a disc drive for preventing aberrations of laser light due to variations in temperature and humidity to ensure satisfactory characteristics of the laser light. A compound lens () is disposed in the optical path of the laser light, which is emitted by a light-emitting device () to be incident on a beam splitter (), and in the optical path of the laser light, which exits from the beam splitter to be incident on a photodetector (). The compound lens includes a diffractive section () for diffracting the laser light and a lens section () having a predetermined function for the laser light. The compound lens is formed by integrating individual sections including the diffractive section and the lens section. The compound lens is provided with a passage hole () that lets in the laser light emitted by the light-emitting device to be incident on the beam splitter.