Title:
LIGHT COLLECTING ELEMENT AND OPTICAL PICKUP DEVICE EMPLOYING SAME
Document Type and Number:
WIPO Patent Application WO/2011/099088
Kind Code:
A1
Abstract:
A light collecting element comprises a plurality of semiconductor lasers (101), (102) that emit laser light of varying wavelengths; a comparator circuit (105) that compares voltages between terminals of the plurality of semiconductor lasers (101), (102) and outputs a signal corresponding to the result of the comparison thereof; a light receiving element (106) that outputs a photoelectric current corresponding to the quantity of laser light that is emitted by the plurality of semiconductor lasers (101), (102); and a current mirror circuit (107) that switches between amplifying and attenuating the photoelectric current outputted by the light receiving element (106) and outputs a monitor signal, on the basis of the signal outputted by the comparator circuit (105).
Inventors:
OKAURA, Shingo (())
岡浦伸吾 (())
TANIGUCHI, Masaki (())
岡浦伸吾 (())
TANIGUCHI, Masaki (())
Application Number:
JP2010/004046
Publication Date:
August 18, 2011
Filing Date:
June 17, 2010
Export Citation:
Assignee:
PANASONIC CORPORATION (1006, Oaza Kadoma Kadoma-sh, Osaka 01, 〒5718501, JP)
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 〒5718501, JP)
OKAURA, Shingo (())
岡浦伸吾 (())
パナソニック株式会社 (〒01 大阪府門真市大字門真１００６番地 Osaka, 〒5718501, JP)
OKAURA, Shingo (())
岡浦伸吾 (())
International Classes:
G11B7/125; H01S5/0683
Attorney, Agent or Firm:
MAEDA, Hiroshi et al. (Osaka-Marubeni Bldg, 5-7Hommachi 2-chome, Chuo-ku, Osaka-sh, Osaka 53, 〒5410053, JP)
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Claims: