Optical data reading apparatus and an optical data reading metho

Details Optical data reading apparatus and an optical data reading metho Optical data reading apparatus and an optical data reading metho

1993-09-22

1995-07-25

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, G11B 509

Patent

active

054368847

ABSTRACT:
According to the optical data reading apparatus and an optical data reading method of the present invention, a semiconductor laser emits laser light while periodically modulating a frequency or a phase thereof. The laser light is divided into a first beam to be radiated to a magnetooptical disc and a second beam. The first and the second beams run along optical paths having different lengths from each other, and thus have different frequencies or phases from each other. The first beam reflected by the magnetooptical disc and the second beam are mixed and then incident on a photodetector. An electric output extracted from the photodetector based on a frequency difference or a phase difference between the first and the second beams, and thus data stored in the magnetooptic disc is restored.

REFERENCES:
patent: 5214633 (1993-05-01), Tanno et al.
patent: 5233582 (1993-08-01), Tanno et al.
Kobayashi, T., "Interferometry for measuring distance and displacement using semiconductor lasers" Optics (1988) 17(6):279-284.
Tatsuno, K., et al., "Diode laser direct modulation heterodyne interferometer" Applied Optics (1987) 26(1):37-40.

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