发明名称 |
Optical head device and optical information apparatus using the same |
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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申请公布号 |
US2003095492(A1) |
申请公布日期 |
2003.05.22 |
申请号 |
US20020264297 |
申请日期 |
2002.10.02 |
申请人 |
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发明人 |
NISHINO SEIJI;WADA HIDENORI;KOMMA YOSHIAKI;MIZUNO SADAO;MATSUZAKI KEIICHI |
分类号 |
G11B7/125;G11B7/135;(IPC1-7):G11B7/135 |
主分类号 |
G11B7/125 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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