Optical disc head with high signal-to-noise ratio

Details Optical disc head with high signal-to-noise ratio Optical disc head with high signal-to-noise ratio

1987-06-24

1989-03-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

365122, G11C 1306

Patent

active

048126373

ABSTRACT:
An optical head for an optical disc or for a magneto-optical disc for reading out information recorded thereon, including a light source for emitting a beam of linearly polarized light toward the disc, at least one Faraday rotator for passing the emitted beam and rotating a plane of polarization of the beam by a predetermined angle, at least one beam splitter for either passing or reflecting the incident light depending upon the plane of polarization, and a light sensor for sensing a light reflected by the splitter. Some combinations and configurations of these beam splitters and Faraday rotators are exemplified. This head is designed to be easily assembled and to effectively detect a light reflected by the optical disc, thereby providing reliable detection of data recorded thereon.

REFERENCES:
patent: 4410277 (1983-10-01), Yamamoto et al.
patent: 4464437 (1984-08-01), Urner Wille et al.
patent: 4497006 (1985-01-01), Deguchi et al.
patent: 4562502 (1985-12-01), Ezaki et al.
patent: 4710431 (1987-12-01), Van Engelen et al.

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