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Patent Searching and Data


Title:
OBJECTIVE LENS FOR AN OPTICAL PICKUP DEVICE, OPTICAL PICKUP DEVICE, AND OPTICAL INFORMATION RECORDING/READING DEVICE
Document Type and Number:
WIPO Patent Application WO/2011/132696
Kind Code:
A1
Abstract:
The actual measured light utilization efficiency of the disclosed objective lens is at least 50% for Blu-ray Discs, at least 35% for DVDs, and at least 30% for CDs, with η1 > η2 and η1 > η3; a photodetector can detect the optimal amount of luminous flux taking into account the reflectivity of each optical disc.

Inventors:
NAKAMURA, Kentarou (INC. 2970, Ishikawa-machi, Hachioji-sh, Tokyo 05, 〒1928505, JP)
Application Number:
JP2011/059686
Publication Date:
October 27, 2011
Filing Date:
April 20, 2011
Export Citation:
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Assignee:
KONICA MINOLTA OPTO, INC. (2970, Ishikawa-machi Hachioji-sh, Tokyo 05, 〒1928505, JP)
コニカミノルタオプト株式会社 (〒05 東京都八王子市石川町2970番地 Tokyo, 〒1928505, JP)
International Classes:
G02B13/00; G02B13/18; G11B7/1353; G11B7/1367; G11B7/1374; G11B7/1392
Domestic Patent References:
2010-02-04
2008-04-17
2007-12-21
Attorney, Agent or Firm:
KOYO INTERNATIONAL PATENT FIRM (Nikko Kagurazaka Bldg, 18 Iwatocho, Shinjuku-k, Tokyo 32, 〒1620832, JP)
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Claims: