Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1992-03-06
1996-04-02
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 4414, 369 4421, 369119, G11B 7135
Patent
active
055047319
ABSTRACT:
A remote fine positioning mechanism of an optical storage device includes a stationary galvanometer-controlled mirror (galvo mirror) and an imaging lens, the imaging lens positioned to provide an image of the galvo mirror at the front focal point of an objective lens mounted to an optical head assembly. The galvo mirror functions as a beam steering element that is rotated about a steering axis to change the angle of incidence of a collimated laser beam with respect to the objective lens during track selection operations. Thus, for rotation of the galvo mirror to change the direction of the laser beam, the system operates as though the mirror were physically located at that focal point. To perform the imaging function, the imaging lens decollimates the beam. A collimation-correction lens is therefore provided to ensure, in combination with the imaging lens, that the laser beam remains collimated when it reaches the objective lens.
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Jain Amit
Keppeler Erwin
Lee Neville K.
Edun Muhammad
Epps Georgia Y.
Quantum Corporation
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