Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1988-02-16
1990-11-06
Stephan, Steven L.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
2502015, 369 4411, 369112, 369 41, G11B 1722, G11B 2100
Patent
active
049691376
ABSTRACT:
In optically coupling a plurality of light sources to an optical system for focusing light beams from the light sources into spots on a record plane, a center axis of a light beam from a first one of the light sources is aligned to an optical axis of the focusing optical system, and the spots other than a first spot formed by the light beam from the first light source are rotated around the first spot on the record plane to position the spots to the respective target tracks, and a tracking error signal for at least one of the first spot and another spot is detected and the positions of the plurality of spots are integrally controlled based on the detected tracking error signal so that the plurality of spots can follow the respective target tracks. The target tracks to which the spots are to be positioned may be either one track or different tracks. The positioning of the spots to the target tracks may be done either manually or automatically. In the automatic method, a tracking error signal is detected for the first spot, and a deflection mechanism for radially swinging beams from the laser light sources is controlled to control the positions of the spots on the record plane and to cause the first spot to follow the target track.
REFERENCES:
patent: 4462095 (1984-07-01), Chen
patent: 4695992 (1987-09-01), Aoi
patent: 4727528 (1988-02-01), Wyland
Jenkins & White, Fundamentals of Optics, The Maple Press Co., York, Pa. 1957, pp. 16 & 17.
Hara Fumio
Maeda Takeshi
Saito Atsushi
Sugiyama Hisataka
Hitachi , Ltd.
Stephan Steven L.
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