发明授权
- 专利标题: Achromatic polarization devices for optical disc pickup heads
- 专利标题(中): 用于光盘拾取头的消色差极化装置
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申请号: US11303904申请日: 2005-12-16
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公开(公告)号: US08085644B2公开(公告)日: 2011-12-27
- 发明人: Gary D. Sharp
- 申请人: Gary D. Sharp
- 申请人地址: US CA Beverly Hills
- 专利权人: RealD Inc.
- 当前专利权人: RealD Inc.
- 当前专利权人地址: US CA Beverly Hills
- 代理机构: Baker & McKenzie LLP
- 主分类号: G11B7/135
- IPC分类号: G11B7/135
摘要:
Chemically-bonded laminated polymer achromatic polarization devices, such as circular polarizers, are disclosed for use in optical disc (e.g., CD/DVD) pickup heads. Chemically-bonded laminated polymer achromatic polarization devices have the benefit of providing stable retardation and optic axis over an extended wavelength range, thereby ensuring orthogonal polarization in double-pass for two or more laser wavelengths. Moreover, the chemically-bonded laminated polymer achromatic polarization devices can be symmetric in construction, such that there is no specific input and output side. This alleviates the need to produce geometries that prohibit inversion of the part when installed in the system. Manufacturing processes that produce chemically-bonded laminated polymer achromatic polarization devices, with high light efficiency, durability and robust performance in a variety of environmental conditions are disclosed.
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