Non-contact servotrack writing with phase sensitive detection

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head

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G01B 902

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active

059911123

ABSTRACT:
A servotrack writing apparatus (10) for use on computer disk drive workpieces (12). A writer controller (58) puts the writing apparatus (10) in the role of master to direct the workpiece (12) as a slave to position its read-write head (36) and to write the servotracks. A tracking section (54) provides a modulated light beam (72) from which a reflected portion is detected by a bi-cell photo sensor (70) and processed in the writer controller (58) to determine the position of a thru-hole (40) or a detection region (42) in the actuator arm (24) of the workpiece (12). The writer controller (58) may use a lock-in amplifier (102, 104) for the processing the reflected portion of the light beam (72). A reference arm (44) is locked and moved in a synchronous relationship with the actuator arm (24). A measurement section (56) determines the position of the reference arm (44), and may include an interferometer system (122) having a differential head (128) and a differential target (124), to permit increased resolution and nulling of errors. The interferometer system (122) may also use multiple frequency techniques to further increase resolution.

REFERENCES:
patent: 577130 (1897-04-01), Baker
patent: 4481550 (1984-11-01), Miller et al.
patent: 5108184 (1992-04-01), Brown et al.
patent: 5162955 (1992-11-01), Burdenko
patent: 5227625 (1993-07-01), Hetzel
patent: 5247493 (1993-09-01), Kime et al.
patent: 5315372 (1994-05-01), Tsai
patent: 5319509 (1994-06-01), Micheleson et al.
patent: 5325349 (1994-06-01), Taniguchi
patent: 5339204 (1994-08-01), James et al.
patent: 5341256 (1994-08-01), Murata et al.
patent: 5442172 (1995-08-01), Chiang et al.
patent: 5471304 (1995-11-01), Wang
patent: 5488519 (1996-01-01), Ishida et al.
patent: 5568337 (1996-10-01), Eguchi et al.
Meyer & Amer, Novel Optical Approach to Atomic Force Microscopy, Sep. 19, 1988, pp. 1045-1047, vol. 53 No. 12, US, Appl. Phys. Lett.

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