Monolithic optical pickup and an assembly including the pickup with laser source(s) and optical detector(s)
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United States of America Patent
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Jun 8, 2004
Grant Date -
N/A
app pub date -
May 10, 2000
filing date -
May 10, 2000
priority date (Note) -
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Abstract
A monolithic optical pickup has all passive optical elements aligned during fabrication, thereby requiring no alignment during the assembly of a system utilizing it. Its supporting structure is the monolithic passive device itself. A single surface incorporates all the functions of an optical pickup system including a focusing element, image creation apertures and stops, scattering/reflection reduction, and return path apertures and optics. The elements are formed from a metalized layer which is applied lithographically. Placing the apertures and stops on the principal plane of the focussing element allows for the image size to be precisely controlled by the image distance. The monolithic optical pickup is well suited for use with multiple detector elements. Alternate embodiments of the invention may omit some of the optical system elements.
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