Title:
OPTICAL PICKUP DEVICE AND OPTICAL PICKUP SUPPORTTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/158954
Kind Code:
A1
Abstract:
In order to achieve further cost reduction while the package size of an optical pickup having two objective lenses and the restriction on the disposition of the two objective lenses are maintained, an optical system for laser light emitted from a red/infrared dual-wavelength laser diode is disposed such that a parallel plate beam splitter is disposed to be inclined with respect to the optical axis of focused light of the laser light reflected by an optical disk and the optical axis of the laser light between a rising mirror and the parallel plate beam splitter is inclined from the signal track direction of the optical disk. The laser light to which astigmatism is given by transmission through the parallel plate beam splitter is caused to be directly incident on a light detector without passing through an astigmatism adjustment optical element.
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Inventors:
YAMAGISHI Yasufumi (C/O SANYO OPTEC DESIGN CO. LTD, 1-6-3, Yushima, Bunkyo-ku, Tokyo 34, 〒1130034, JP)
Application Number:
JP2011/064000
Publication Date:
December 22, 2011
Filing Date:
June 14, 2011
Export Citation:
Assignee:
SANYO ELECTRIC CO., LTD. (5-5 Keihanhondori 2-chome, Moriguchi-shi, Osaka 77, 〒5708677, JP)
三洋電機株式会社 (〒77 大阪府守口市京阪本通二丁目５番５号 Osaka, 〒5708677, JP)
SANYO OPTEC DESIGN CO., LTD. (1-6-3, Yushima Bunkyo-ku, Tokyo 34, 〒1130034, JP)
三洋電機株式会社 (〒77 大阪府守口市京阪本通二丁目５番５号 Osaka, 〒5708677, JP)
SANYO OPTEC DESIGN CO., LTD. (1-6-3, Yushima Bunkyo-ku, Tokyo 34, 〒1130034, JP)
International Classes:
G11B7/135
Attorney, Agent or Firm:
OKADA Kei (170-1, Hosoya-cho Ota-city, Gunma 42, 〒3730842, JP)
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Claims: