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Minimizing Skew Angle Error in a Low Cost Two-Spring Actuator

IP.com Disclosure Number: IPCOM000035876D
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Chainer, TJ: AUTHOR [+5]

Abstract

Disclosed is an actuator for magnetic recording disk drives which is frictionless, particle-free, low mass and has minimal skew angle error over the data band. Driven by a voice coil motor (VCM), this system is capable of meeting the access time requirements of most magnetic recording systems.

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Minimizing Skew Angle Error in a Low Cost Two-Spring Actuator

Disclosed is an actuator for magnetic recording disk drives which is frictionless, particle-free, low mass and has minimal skew angle error over the data band. Driven by a voice coil motor (VCM), this system is capable of meeting the access time requirements of most magnetic recording systems.

In magnetic recording disk drives the actuation mechanisms have multiple requirements. Fast access time requires low mass systems which are less tolerant of frictional forces. Lower fly heights require ultra-clean systems which do not generate particulate debris. In addition, systems which produce linear motion are desirable because they eliminate skew angle error between the recording head and track. These skew angles are normally present in rotary actuators and typically exceed +/- 6 degrees. However, rotary actuators are widely used because of their low fabrication cost and good access performance.

(Image Omitted)

The design shown in Fig. 1 shows a VCM coupled to a suspension system consisting of a pair of leaf springs. These springs consist of rigid beams with flexible ends (where the bending occurs) which approximate a four-bar linkage. When acted upon by a force F, the system translates in X. In addition, there is an unwanted motion in Y (small compared to X). This Y motion results in a skew angle much less than a rotary actuator and is typically less than 1 degree.

The VCM and actuator assembly have no bea...