Optical head using an optical scanner

Details Optical head using an optical scanner Optical head using an optical scanner

1990-10-01

1993-03-30

Psitos, Aristotelis

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4418, G11B 7135

Patent

active

051990202

ABSTRACT:
An optical head for optical storage, having an optical scanner for scanning a laser beam in a recording region, an objective lens of large aperture for collecting all scanned laser beams, and a method for detecting and correcting the focus error and tracking error, a light source and photodetector, in which the objective lens is fixedly set up and the photodetector is placed at the conjugate point of the focal point of laser beam on the recording media. The laser beams reflected from the media are always collected at the center of photodetector, out of relation to the scan angle, thereby reading uniformly the information from the recording media and it is not necessary to move the objective lens. Therefore, access time can be very short.

REFERENCES:
patent: 4298974 (1981-11-01), Tsunoda
patent: 4379612 (1983-04-01), Matsuoka
patent: 4521680 (1985-06-01), Ando
patent: 4764912 (1988-08-01), Ando et al.
patent: 4768179 (1988-10-01), Gottfried
patent: 4959824 (1990-09-01), Ueda et al.
patent: 4969137 (1990-11-01), Sugiyama et al.

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