Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1980-10-20
1984-04-17
Faber, Alan
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
350299, G11B 700
Patent
active
044438737
ABSTRACT:
Reciprocal optical system for use in an optical disc reader of the type having a laser beam and being capable of receiving optical data disc having information recorded thereon and a detector for detecting the laser beam. At least one polarizing mirror is provided and at least one converting mirror for producing a 90.degree. phase shift is provided. At least one polarizing mirror and at least one converting mirror, and the laser beam are positioned relative to the optical disc to provide from the laser beam an outgoing beam which impinges upon said at least one polarizing mirror and thereafter upon said at least one converting mirror in its travel to the optical disc and is reflected to provide a returning beam which impinges upon said at least one converting mirror and thereafter on said at least one polarizing mirror and then onto the detector. The outgoing and returning beams are orthogonally linearly polarized with respect to each other and are separated by the polarizing mirror by one beam being reflected and the other beam being transmitted by the polarizing mirror.
REFERENCES:
patent: 4100577 (1978-07-01), Naruse
patent: 4139263 (1979-02-01), Lehureau
patent: 4312570 (1982-01-01), Southwell
University Physics by Sears et al., .COPYRGT. 1955, pp. 875-878.
Faber Alan
Optical Coating Laboratory, Inc.
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