Signal to noise ratio of optical head apparatus employing semico

Details Signal to noise ratio of optical head apparatus employing semico Signal to noise ratio of optical head apparatus employing semico

1986-11-07

1989-05-30

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, 369111, G11B 700

Patent

active

048357618

ABSTRACT:
In an optical head apparatus for an optical information carrier comprising a semiconductor laser beam source, a condenser lens system and a beam splitter interposed therebetween in an optical system wherein the noise level may be beyond the allowable limit due to the excessive amount of the laser beam which is made incident on the laser beam source after being reflected by the information carrier, the reflected light attenuating means is provided between the optical information carrier and the semiconductor laser beam source, so that the noise level can be set to remain within the allowable limit.

REFERENCES:
patent: 4337535 (1982-06-01), Van Megen et al.
patent: 4460990 (1984-07-01), Opheij
patent: 4592038 (1986-05-01), Kubota et al.
Mitsubishi Denki-vol. 58, No. 11, 1984-pp. 742-745.
Nikkei Electronics, 1983, 10/10, pp. 185.
English Translation of 59-71142.

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