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Proceedings Paper

Three-beam CD optical pickup using a holographic optical element
Author(s): Yoshio Yoshida; Takahiro Miyake; Yukio Kurata; Toshio Ishikawa
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Paper Abstract

A three beam CD optical pickup has been developed with a holographic optical element (HOE). The HOE has a hologram for beam splitting and servo signal generation on one side of a glass substrate, and a grating for tracking-beam generation on the other side. The hologram pattern is divided into two regions. The grating periods of these regions are different from each other, so that the focus error signal is detected by Foucault knife-edge method. And also the radial error signal is detected by the twin-spot method. The HOE is cemented at the top of a package in which a laser diode and a photodiode for signal detection are mounted. The HOE offers a improvement of environmental stability of the pickup too. In spite of the usage of a plastic housing, the optical pickup shows superior characteristics of environmental stability.

Paper Details

Date Published: 1 March 1991
PDF: 8 pages
Proc. SPIE 1401, Optical Data Storage Technologies, (1 March 1991);
Show Author Affiliations
Yoshio Yoshida, Sharp Corp. (Japan)
Takahiro Miyake, Sharp Corp. (Japan)
Yukio Kurata, Sharp Corp. (Japan)
Toshio Ishikawa, Sharp Corp. (Japan)

Published in SPIE Proceedings Vol. 1401:
Optical Data Storage Technologies
Soo-Jin Chua; John C. McCallum, Editor(s)

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