Optical pickup for reproducing information from an optical infor

Details Optical pickup for reproducing information from an optical infor Optical pickup for reproducing information from an optical infor

1992-07-23

1993-09-21

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369, G11B 700

Patent

active

052475069

ABSTRACT:
An optical pickup is used to optically read recorded information on an optical information storage medium such as a compact disk in a compact disk player, for example. The optical pickup has a beam splitter having a first facet for reflecting a laser beam from a semiconductor laser toward the optical information storage medium. The right beam reflected from the optical information storage medium passes through an is diffracted by the first facet of the beam splitter. The laser beam then passes through a second facet of the beam splitter, and is then divided by a diffraction grating into a transmitted beam and a diffracted beam that is then guided through an optical waveguide. The beam splitter is simple in structure and can easily be manufactured, and hence the optical pickup is relatively small in size. Another optical pickup includes a phase layer, a polarizer layer, and a diffraction grating in a semiconductor substrate. A laser beam reflected by an optical information storage medium is caused to change the phase by the phase layer, and passes through the polarizer layer to the diffraction grating, which divides the laser beam into a transmitted beam and a diffracted beam. The phase layer and the polarizer layer are fabricated at the same time that the semiconductor substrate is manufactured.

REFERENCES:
patent: 4733065 (1988-03-01), Hoshi et al.
patent: 4893296 (1990-01-01), Matsumoto et al.
patent: 5070488 (1991-12-01), Fukushima et al.
patent: 5105403 (1992-04-01), Kando et al.
patent: 5107477 (1992-04-01), Fujita et al.

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