Invention Grant
- Patent Title: Optical pickup
- Patent Title (中): 光学拾音
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Application No.: US13291246Application Date: 2011-11-08
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Publication No.: US08477585B2Publication Date: 2013-07-02
- Inventor: Kenji Okamoto
- Applicant: Kenji Okamoto
- Applicant Address: JP Osaka
- Assignee: Funai Electric Co., Ltd.
- Current Assignee: Funai Electric Co., Ltd.
- Current Assignee Address: JP Osaka
- Agency: Morgan, Lewis & Bockius LLP
- Priority: JP2010-251149 20101109
- Main IPC: G11B7/12
- IPC: G11B7/12

Abstract:
An optical pickup has an objective lens that is shared for light of three wavelengths. The effective diameter of the light that passes through the objective lens decreases in a sequence of the light of a first wavelength (light for a first optical disk), the light of a second wavelength (light for a second optical disk) and the light of a third wavelength (light for a third optical disk); and the light of the third wavelength is incident on the objective lens in a finite system. The objective lens is provided so that the focal distance of the light of the second wavelength is greater than the focal distance of the light of the first wavelength.
Public/Granted literature
- US20120281518A1 OPTICAL PICKUP Public/Granted day:2012-11-08
Information query
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