Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1996-02-28
1998-08-18
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 9802, 360 9807, 360106, 360 75, G11B 5596
Patent
active
057965420
ABSTRACT:
An apparatus and method useful in a servo-track writer (STW) system for simultaneous servowriting of tracks on disk surfaces in a plurality of disk drive head assemblies (HDAs). The STW system includes a motor disposed to turn a drive shaft on a shaft axis. The drive shaft is supported in a base air bearing and coupled to a rotatable elongated push-tower apparatus such that shaft rotation causes rotation of the push-tower apparatus on a STW bearing axis disposed coaxially with the shaft axis. The push-tower apparatus includes an externally-fixed retroreflector displacement sensor and a plurality of fixed HDA actuator arm engaging pins each disposed to engage one of a plurality of HDAs mounted in alignment in a stationary HDA positioning apparatus. Push-tower rotation moves each engaging pin into contact with a respective HDA actuator arm, moving the actuator arm to a position that is determined by processing position information feedback from the push-tower retroreflector displacement sensor. The rotatable push-tower apparatus is supported at the end opposite the base air bearing by a self-aligning distal air bearing. The invention coaxially aligns each HDA actuator arm pivot axis with the STW bearing axis and the respective engaging pin axis to reduce head-positioning errors caused by retroreflector sensor transmission error and supports the distal push-tower shaft with a self-aligning air bearing to reduce head-positioning errors caused by friction noise.
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C. Lee, "Servowriters: A Critical Tool in Hard Disk Manufacturing", Solid State Technology, May 1991, pp. 207-211.
R. Freedland et al., "Servo Writers ... the Pros and Cons of Different Approaches", Hewlett Parckard Data Storage Symposium, pp7-1 -7-31 Feb. 1991.
Shara Milad G.
Sniezek Andrew L.
Western Digital Corporation
Young Leo J.
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