发明授权
- 专利标题: Optical pickup
- 专利标题(中): 光学拾音
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申请号: US12956155申请日: 2010-11-30
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公开(公告)号: US08427911B2公开(公告)日: 2013-04-23
- 发明人: Hiromi Kita , Tomoto Kawamura , Toshiteru Nakamura
- 申请人: Hiromi Kita , Tomoto Kawamura , Toshiteru Nakamura
- 申请人地址: JP Iwate
- 专利权人: Hitachi Media Electronics Co., Ltd.
- 当前专利权人: Hitachi Media Electronics Co., Ltd.
- 当前专利权人地址: JP Iwate
- 代理机构: Antonelli, Terry, Stout & Kraus, LLP.
- 优先权: JP2010-012753 20100125
- 主分类号: G11B7/00
- IPC分类号: G11B7/00 ; G11B5/58 ; G11B20/18 ; G11B7/135
摘要:
An optical pickup includes a light source, an objective lens, a diffraction grating that divides an optical beam reflected from a predetermined information layer, into a plurality of optical beams, and a detector having a plurality of photo-receivers to receive a plurality of optical beams. The diffraction grating has a predetermined region for dividing from a signal light beam a region including a central portion of a spot which the signal light beam will form on the diffraction grating. A distance from a central section of the detector to that of a spot center photo-receiver on the detector, the spot center photo-receiver being provided to receive the optical beams formed by division in a predetermined region of the diffraction grating, is equal to or greater than a spot radius of the unwanted light beams entering the predetermined region of the diffraction grating, on the detector.
公开/授权文献
- US20110182159A1 OPTICAL PICKUP 公开/授权日:2011-07-28