Optical head with forward and reflected light beams propagating

Details Optical head with forward and reflected light beams propagating Optical head with forward and reflected light beams propagating

1996-01-11

1997-11-04

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 4412, 369 4423, 369 4437, 369103, 369112, 369116, G11B 7135

Patent

active

056847793

ABSTRACT:
An optical head which records data onto an optical data recording medium and reproduces the data therefrom includes a laser light source, a collimator lens, an objective lens, a light splitting device arranged between the laser light source and the objective lens, for splitting the emitted light from the laser light and a reflected light from the optical data recording medium. A diffraction grating is provided to which only the reflected light split at the light splitting device is incident to, and which leads the reflected light split at the optical element onto a photo-detector. Thereby, an optical head of high effectiveness in utilization of light and low cost can be obtained.

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patent: 5493555 (1996-02-01), Kimura et al.
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