Optical disc player with molded diffractive optical elements
First Claim
Patent Images
1. An optical disc player comprising:
- a laser;
a lens receiving emissions from said laser, said lens including an injection molded item having a surface and a diffraction pattern having multiple discrete levels molded on said surface, said diffraction pattern being molded using a non-metallic, photolithographically generated master element;
an optical disc support to position an optical disc to reflect laser emissions output from said lens; and
a sensor to receive the reflected emissions.
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Abstract
A method of fabricating a diffractive optical element includes the steps of: etching a negative of a desired multi-level diffraction pattern onto a molding surface of a quartz master element using photolithography, assembling the master element as a portion of a mold,and injecting a plastic molding composition into the mold and against the molding surface of the master element to injection mold a diffractive optical element whereby the optical element has the desired diffraction pattern on its surface. The diffraction pattern is preferably formed on the quartz master using VLSI photolithography.
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Citations
18 Claims
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1. An optical disc player comprising:
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a laser; a lens receiving emissions from said laser, said lens including an injection molded item having a surface and a diffraction pattern having multiple discrete levels molded on said surface, said diffraction pattern being molded using a non-metallic, photolithographically generated master element; an optical disc support to position an optical disc to reflect laser emissions output from said lens; and a sensor to receive the reflected emissions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An optical disc player comprising:
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a laser; a lens receiving emissions from said laser, said lens being formed by injection molding having a first surface and a second surface wherein the first surface and the second surface each have a diffraction pattern having multiple discrete levels molded thereon using a non-metallic, photolithographically generated master element; an optical disc support to position an optical disc to reflect laser emissions from said lens; and a sensor to receive the reflected emissions. - View Dependent Claims (12, 13, 14)
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15. An optical disc player comprising:
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a laser; a lens receiving emissions from said laser, said lens being formed by injection molding having a first surface and a second surface wherein the first surface has a diffraction pattern having multiple discrete levels molded thereon using a non-metallic, photolithographically generated master element and the second surface is shaped to refract light, an optical disc support to position an optical disc to reflect laser emissions from said lens; and a sensor to receive the reflected emissions. - View Dependent Claims (16, 17, 18)
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Specification