Servo track writing technique

Details Servo track writing technique Servo track writing technique

1997-03-14

1998-06-30

Tran, Thang V.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, 360 7811, G11B 5596

Patent

active

057742952

ABSTRACT:
A servotrack writing apparatus (10) having a reference section (30), a workpiece section (32), and a tracking section (34). With the reference section (30) a standard is established without a disk drive workpiece (12) mounted. A workpiece (12) is then mounted in the workpiece section (32) with a beamsplitter-reflector unit (52) attached to the actuator arm (20) bearing the read-write head (18) which is to be used for servotrack writing, and verification information is obtained for comparison with the standard. Based upon this comparison, correction of workpiece (12) mounting offset and eccentricity of beamsplitter-reflector unit (52) mounting may then be performed before servotracks are written, or compensation for such offset and eccentricity may be performed while servotracks are written. The tracking section (34) operates using closed-loop feedback to slave the actuator arm (20) of the workpiece (12) to a tracking arm (62) and then may use a laser interferometer (70) to precisely measure location of a tracking retro-reflector (68) mounted on the tracking arm (62), thereby permitting very accurate and controlled positioning of the synchronized read-write head (18) while servotrack writing is carried out.

REFERENCES:
patent: 5162955 (1992-11-01), Burdenko
patent: 5227625 (1993-07-01), Hetzler
patent: 5315372 (1994-05-01), Tsai

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