Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-02-06
1996-09-03
Hindi, Nabil Z.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4414, 369 4417, 369 32, G11B 700
Patent
active
055530540
ABSTRACT:
A coarse position sensor is provided for an optical recording device to generate a substantially linear coarse position signal, indicative of the position of a coarse carriage along the range of its travel, and which also is substantially immune to environmental and device variations. The sensor includes a light source mounted to a drive frame at one end of the range of travel, a position sensitive device fixed to the frame at the opposite end of the range of travel and facing the light source, and a deflecting optical element mounted to the coarse carriage in the path of the light. As the coarse carriage travels along its stroke between the inner and outer diameters of the optical disk, the amount of deflection of the light beam on the position sensitive device from a reference location will change. Based upon a trigonometric equation, a coarse position signal generator receives the output of the position sensitive device and generates a substantially linear coarse position signal indicative of the position of the coarse carriage.
REFERENCES:
patent: 4426694 (1984-01-01), Kimura
patent: 4805162 (1989-02-01), Stahl et al.
patent: 5095473 (1992-03-01), Gotoh
patent: 5140572 (1992-08-01), Kibune et al.
Gardner Timothy S.
Hansen Delbert A.
Kimura Tomoaki
Chu Kim-Kwok
Hindi Nabil Z.
International Business Machines - Corporation
Shifrin D. A.
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