Optical pickup and optical element used therefor

Optical pickup and optical element used therefor

  • CN 1,180,443 A
  • Filed: 02/20/1997
  • Published: 04/29/1998
  • Est. Priority Date: 02/23/1996
  • Status: Abandoned Application
First Claim
Patent Images

1. , a kind of optical element is characterized by:

  • Form the diffraction grating pattern be close to beyond the zone of the regulation that centre settles at birefringent plate on, and this diffraction grating pattern has the amplitude and the length of regulation, injecting the thickness that has regulation on the optical axis direction in addition, its be by periodically formed ion-exchange zone with this above ion-exchange zone formed deielectric-coating constituted, moreover see through aforesaid diffraction grating pattern for the ordinary ray of aforesaid birefringent plate, and its 0 diffracted wave of extraordinary light use the diffraction grating pattern make it the blocking, so can set the thickness in above-mentioned ion-exchange zone and the thickness of aforementioned deielectric-coating.

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