Optical head with forward and return light beam propagating alon

Details Optical head with forward and return light beam propagating alon Optical head with forward and return light beam propagating alon

1994-03-02

1996-05-07

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 13, 369 4414, 369109, G11B 700, G11B 1100

Patent

active

055153534

ABSTRACT:
An optical head comprising a light source for emitting a light beam, an objective lens for focusing the light beam onto an optical record medium as a fine spot and a photodetector for receiving the light beam reflected by the optical record medium to derive an information signal, tracking error signal and focusing error signal. A Wollaston prism is arranged on an optical path along which both forward and return light beams propagate, so that the return light beam is separated from the forward light beam. The Wollaston prism is formed by cementing two wedge shaped-crystal plates having different directions of optic axes. The light source and photodetector may be arranged on a same substrate, and thus the optical head can be made small in size and less expensive in cost and can have a high reliability.

REFERENCES:
patent: 4150399 (1979-04-01), Boonstra
patent: 4863246 (1989-09-01), Anthon
patent: 4951274 (1990-08-01), Iwanaga
patent: 5050155 (1991-09-01), Kurata
patent: 5099470 (1992-03-01), Matsubayashi
patent: 5172368 (1992-12-01), Lehureau
patent: 5251198 (1993-10-01), Strickler
patent: 5404490 (1995-04-01), Matsubayashi

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