Optical head device

Details Optical head device Optical head device

1996-05-23

1997-06-10

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 4423, 369 4437, 369117, 369118, G11B 700, G11B 7135

Patent

active

056383533

ABSTRACT:
An optical head device which has: a light source for projecting laser light; a beam splitter for reflecting the laser light onto an optical disk; an objective for focusing the reflected light on an information recording surface of the optical disk to form a micro spot thereon; an optical detector for receiving a light component transmitted through the beam splitter of light reflected on the information recording surface and converting the light component into an electrical signal; a variable aperture device for varying a diameter of the micro spot according to an external input, the variable aperture device being provided between the beam splitter and the objective; and a variable rotation angle diffraction grating for varying a rotation angle of a sub-beam for tracking of the laser light according to an external input, the variable rotation angle diffraction grating being provided between the light source and the beam splitter.

REFERENCES:
patent: 5281797 (1994-01-01), Tatsuno et al.
"DVD/CD" Nikkei Mechanical; 1995.8.7, No. 460; pp. 62-65.

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