发明授权
- 专利标题: Optical head device and optical information apparatus using the same
- 专利标题(中): 光头装置及其使用的光信息装置
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申请号: US11443751申请日: 2006-05-31
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公开(公告)号: US07330419B2公开(公告)日: 2008-02-12
- 发明人: Seiji Nishino , Hidenori Wada , Yoshiaki Komma , Sadao Mizuno , Keiichi Matsuzaki
- 申请人: Seiji Nishino , Hidenori Wada , Yoshiaki Komma , Sadao Mizuno , Keiichi Matsuzaki
- 申请人地址: JP Osaka
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JP Osaka
- 代理机构: Hamre, Schumann, Mueller & Larson, P.C.
- 优先权: JP2001-306119 20011002; JP2002-247747 20020827; JP2002-274085 20020919
- 主分类号: G11B7/00
- IPC分类号: G11B7/00
摘要:
An optical head device includes a focusing optical system for focusing a laser beam emitted from a semiconductor laser light source on an optical information medium with an objective lens. A chromatic aberration correction element for correcting chromatic aberration occurring in the objective lens is provided between the semiconductor laser light source and the optical information medium. A light distribution correction element in which the transmittance increases with the distance from the center of the aperture surface of the objective lens is provided so as to correct a reduction of the intensity of the light incident on the aperture surface of the objective lens with the distance from the center of the aperture surface.
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