Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1984-07-06
1986-11-04
McElheny, Jr., Donald
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 46, 369112, G11B 700
Patent
active
046213511
ABSTRACT:
A beam alignment system and method for aligning a first radiation beam with respect to a second radiation beam as these beams share a desired optical path. Beam steering means, such as a galvonometer controlled mirror, steer the alignment of the first beam as it enters the shared optical path. Detection means are employed to sense the relative alignment between the first and second beams as they travel through the shared path. This sensed alignment is compared to a desired alignment, and a position error signal is generated to indicate the error therebetween. The position error signal, in turn, is used to steer the galvonometer controlled mirror in order to force the beam alignment error between the two beams to zero. In a preferred embodiment, the beam alignment system is used in an optical disk storage system to precisely position a write beam a desired distance from a read beam; thereby allowing a data track written with the write beam on a storage disk to be spaced a desired distance (the track pitch) from a previously written track that is being followed by the read beam.
REFERENCES:
patent: 4074085 (1978-02-01), Russell
patent: 4167024 (1979-09-01), Hamisch
patent: 4290122 (1981-09-01), Bates et al.
patent: 4504939 (1985-03-01), Eberly
patent: 4571712 (1986-02-01), Romano et al.
Baer James W.
Hargarten James W.
Hoshiko Henry H.
McIntosh Robert P.
Reilly Charles M.
McElheny Jr. Donald
Storage Technology Partners II
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