Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1999-03-08
2000-04-25
Dinh, Tan
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369119, 369 4423, 369 4414, G11B 712
Patent
active
060552212
ABSTRACT:
An optical pickup comprises a semiconductor laser for emitting a light beam, a galvano-mirror for deflecting the light beam, a relay lens interposed between the laser and the mirror, and a condensing optical system for converging the light beam from the galvano-mirror on a storage medium. The condensing optical system includes a parallel flat plate, an imaging lens for changing the light beam from the galvano-mirror into a parallel light beam, a riser mirror for reflecting the parallel light beam, and an objective lens for converging the reflected light beam. The reflective surface of the galvano-mirror and the front focus of the objective lens are associated with each other in conjugate relative positions, which are adjusted by providing the parallel flat plate. The parallel flat plate is selected among prepared ones that have the same refractive index and different thicknesses. The selected parallel flat plate is expected to minimize the movement of a light beam at the front focus of the objective lens when the galvano-mirror is swung.
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Chu Kim-Kwok
Dinh Tan
Olympus Optical Co,. Ltd.
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