Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1984-07-06
1986-02-18
McElheny, Jr., Donald
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369111, G11B 700
Patent
active
045717141
ABSTRACT:
A system and method for optically measuring and maintaining track pitch in an optical storage system. A set of at least four calibration tracks, each having a prescribed track pitch or distance therebetween, are precisely placed on a recording medium of the optical storage system during the manufacture thereof. When this recording medium is subsequently inserted into the optical storage system, the track pitch of a select pair of the calibration tracks is optically measured by maximizing the amplitude of a data read radiation beam, and an offset signal is generated in response to this measurement. This offset signal is used within the optical storage system for controllably positioning a second radiation beam with respect to a first radiation beam, the first radiation beam being directed to follow a previously written data track on the recording medium. The offset signal may be stored so that it need only be generated during an initialization or calibration mode of the optical storage system, and thereafter be readily available for positioning the second radiation beam relative to the first radiation beam. The select pair of calibration tracks may be an inner pair, having additional tracks adjacent both sides thereof, or an outer pair, having an additional track adjacent only one side thereof; thereby having included in the offset signal the optical effects of having additional data tracks adjacent or not adjacent the respective sides of the pair of calibration tracks whose track pitch is being measured.
REFERENCES:
patent: 4138741 (1979-02-01), Hedlund et al.
patent: 4167024 (1979-09-01), Hamisch
patent: 4283777 (1981-08-01), Curry et al.
patent: 4290122 (1981-09-01), Bates et al.
patent: 4432083 (1984-02-01), Hsieh et al.
patent: 4504939 (1985-03-01), Eberly
Mathews Harlan P.
Muckle Alexander M.
Romano Paul
Gold Bryant R.
McElheny Jr. Donald
Storage Technology Partners II
Young James R.
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