Invention Grant
US08085644B2 Achromatic polarization devices for optical disc pickup heads 有权
用于光盘拾取头的消色差极化装置

  • Patent Title: Achromatic polarization devices for optical disc pickup heads
  • Patent Title (中): 用于光盘拾取头的消色差极化装置
  • Application No.: US11303904
    Application Date: 2005-12-16
  • Publication No.: US08085644B2
    Publication Date: 2011-12-27
  • Inventor: Gary D. Sharp
  • Applicant: Gary D. Sharp
  • Applicant Address: US CA Beverly Hills
  • Assignee: RealD Inc.
  • Current Assignee: RealD Inc.
  • Current Assignee Address: US CA Beverly Hills
  • Agency: Baker & McKenzie LLP
  • Main IPC: G11B7/135
  • IPC: G11B7/135
Achromatic polarization devices for optical disc pickup heads
Abstract:
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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