发明授权
- 专利标题: Optical pickup and optical information reproducing apparatus using same
- 专利标题(中): 光拾取和使用它的光学信息再现装置
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申请号: US11508969申请日: 2006-08-24
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公开(公告)号: US07715298B2公开(公告)日: 2010-05-11
- 发明人: Kunikazu Ohnishi
- 申请人: Kunikazu Ohnishi
- 申请人地址: JP Oshu-shi
- 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 Oshu-shi
- 代理机构: Antonelli, Terry, Stout & Kraus, LLP.
- 优先权: JP2005-371301 20051226
- 主分类号: G11B7/00
- IPC分类号: G11B7/00
摘要:
An optical pickup module with enhanced aberration correctability is disclosed. This pickup includes more than two different types of laser light sources, an objective lens for collecting and focusing any one of the laser beams leaving the light sources onto an optical disc, and an aberration correction device of the liquid crystal (LC) type, which is disposed between the light sources and the objective lens. The aberration corrector has a surface on which multiple spaced-apart electrodes are patterned for enabling aberration correction relative to incident beams. The corrector controls the potential of a voltage being applied to each electrode in deference to incident beam properties and variations occurrable thereto, e.g., wavelength, effective beam diameter and relative incidence position offsets, thereby to optimally correct beam aberrations, such as coma aberration or wavefront aberration. An optical information reproduction apparatus using the pickup is also disclosed.
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