Optical head assembly

Details Optical head assembly Optical head assembly

1998-03-20

2000-07-04

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369103, G11B 700

Patent

active

060848448

ABSTRACT:
An optical head assembly comprises a laser light source, an objective lens for converging laser light rays emitted from the laser light source at an optical recording medium, a hologram element placed in the optical path between the laser light source and the objective lens, an optical detector for signaling that detects returning light rays from the optical recording medium and an optical detector for monitoring that detects a portion of the laser beams emitted from the laser source toward the optical recording medium. The hologram element has first and second diffraction areas; the first diffraction area diffracting the returning light rays to guide them to the optical detector for signaling; the second diffraction area reflecting and diffracting a portion of the light rays emitted from the laser light source at a fringe-like reflecting portion to guide them to the optical detector for monitoring.

REFERENCES:
patent: 5136152 (1992-08-01), Lee
patent: 5361244 (1994-11-01), Nakamura et al.
patent: 5544143 (1996-08-01), Kay et al.
patent: 5953295 (1999-09-01), Nagano

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