Invention Grant
- Patent Title: Optical pickup apparatus
- Patent Title (中): 光拾取装置
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Application No.: US12040518Application Date: 2008-02-29
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Publication No.: US08154978B2Publication Date: 2012-04-10
- Inventor: Tohru Hotta , Ryoichi Kawasaki , Kenji Kan , Hiroyuki Shindo
- Applicant: Tohru Hotta , Ryoichi Kawasaki , Kenji Kan , Hiroyuki Shindo
- Applicant Address: JP Osaka JP Tokyo
- Assignee: Sanyo Electric Co., Ltd.,Sanyo Optec Design Co., Ltd.
- Current Assignee: Sanyo Electric Co., Ltd.,Sanyo Optec Design Co., Ltd.
- Current Assignee Address: JP Osaka JP Tokyo
- Agency: Fish & Richardson P.C.
- Priority: JP2007-052769 20070302
- Main IPC: G11B7/00
- IPC: G11B7/00 ; G02B1/10

Abstract:
An optical pickup apparatus comprising: an objective lens configured to focus laser light having the Gaussian distribution properties emitted from a laser diode to a signal recording layer of an optical disc; and an adjustment coating formed on a surface of an incident face of the objective lens on which the laser light is to be made incident, the adjustment coating being configured to adjust transmittance of the laser light passing through the objective lens, the adjustment coating being formed on the surface of the incident face such that the transmittance is lowered as a numerical aperture of the objective lens is reduced.
Public/Granted literature
- US20080212452A1 OPTICAL PICKUP APPARATUS Public/Granted day:2008-09-04
Information query
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