Optical pickup
First Claim
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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Accused Products
Abstract
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 perpendicular to the recording face of a recording medium. The hologram mirror includes: 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 substrate, 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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Citations
11 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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:
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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 holographic element, formed on the second surface, for diffracting the light beam which is transmitted from the first surface and is incident thereon to generate a plurality of diffracted beams; and a reflective film formed on the holographic element, wherein the holographic element includes a blazed grating which is designed to make a predetermined one of the diffracted beams most intense. - View Dependent Claims (8, 9, 10, 11)
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Specification