Laser head device

Laser head device

  • CN 100,421,160 C
  • Filed: 02/01/2002
  • Issued: 09/24/2008
  • Est. Priority Date: 02/02/2001
  • Status: Active Grant
First Claim
Patent Images

1. laser head assembly comprises:

  • Launch the LASER Light Source of laser to optical recording media;

    Reflection is from the prism of the return projector of optical recording media reflected back;

    See through from the half-transmitting and half-reflecting mirror of the return projector of prism reflected back;

    Receive the photo detector of the return projector that sees through described half-transmitting and half-reflecting mirror, it is characterized in that,The film that described prism and described half-transmitting and half-reflecting mirror have the component part semi-reflective surface,The film of described prism has the 1st transfer efficiency to the 1st polarized light, to having the 2nd transfer efficiency with perpendicular the 2nd polarized light in the polarization direction of the 1st polarized light,The film of described half-transmitting and half-reflecting mirror has the 3rd transfer efficiency to described the 1st polarized light, and described the 2nd polarized light is had the 4th transfer efficiency,Described prism and described half-transmitting and half-reflecting mirror are constituted as;

    make to total transfer efficiency of the 1st polarized light, promptly the 1st transfer efficiency and the product of the 3rd transfer efficiency with to total transfer efficiency of the 2nd polarized light, promptly the 2nd transfer efficiency equates with the product of the 4th transfer efficiency.

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