Optical recording and reproducing head

Details Optical recording and reproducing head Optical recording and reproducing head

1983-07-13

1986-01-14

Faber, Alan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369111, 369122, 350401, G11B 712

Patent

active

045649316

ABSTRACT:
An optical recording and reproducing head wherein light beams emitted from two light sources are combined and applied to a recording medium and the light beams reflected from the recording medium are drawn out in such a way that they are separated from each other. The wavelengths of the light beams from both light sources are different from each other, i.e., .lambda..sub.1, .lambda..sub.2, and the light beams from the light sources are combined by means of a polarization beam splitter, two quarter wave plates and optical filters, and are then simultaneously focussed by a single focussing lens substantially along the optical axis thereof, thereby allowing microspots of focussed light to be disposed on a disc close to each other. The light beams reflected from the disc are drawn out so as to be completely separated from each other by the polarization beam splitter owing to the difference in polarization direction.

REFERENCES:
patent: 3969575 (1976-07-01), Gerritsen
patent: 4085423 (1978-04-01), Tsunoda
patent: 4334300 (1982-06-01), Arquie
patent: 4399529 (1983-08-01), Leterme

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