Optical pickup

Details Optical pickup Optical pickup

G - Physics

11

B

G11B 7/13 (2006.01) G11B 7/135 (2006.01)

Patent

CA 2138436

The optical pickup of the invention includes a hologram mirror for directing an optical axis of a light beam emitted from a light source to be perpendic- ular to the recording face of a recording medium. The hologram mirror includes: a light transmissive sub- strate 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 substrate, for diffracting the light beam incident thereon to generate a plurality of diffracted beams; and a reflective film, formed on the second sur- face of the substrate, for reflecting the diffracted beams, wherein the holographic element includes a blazed grating which is designed to make a predeter- mined one of the diffracted beams most intense.

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