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Optical pickup

  • US 5,515,354 A
  • Filed: 12/22/1994
  • Issued: 05/07/1996
  • Est. Priority Date: 12/24/1993
  • Status: Expired due to Term
First Claim
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1. An optical pickup including a hologram mirror for directing an optical axis of a light beam emitted from a light source to be perpendicular to a recording face of a recording medium, the hologram mirror comprising:

  • a light transmissive substrate having a first surface and a second surface which are opposite to each other, the light beam from the light source entering the substrate from the first surface;

    a transmissive holographic element, formed on the first surface, for diffracting the light beam incident thereon to generate a plurality of diffracted beams; and

    a reflective film, formed on the second surface of the substrate, for reflecting the diffracted beams,wherein the holographic element includes a blazed grating which is designed to make a predetermined one of the diffracted beams most intense.

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