Head driving circuit

Details Head driving circuit Head driving circuit

1989-05-19

1991-01-29

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Adaptive or optimizing systems including 'bang-bang' servos

360 7805, 360 7804, 360 7806, 360 7807, G05B 1300

Patent

active

049889338

ABSTRACT:
The invention comprises a voice coil motor for moving a head for reading information from or writing information to a disk, a driving circuit for supplying current to the voice coil motor in response to a first control signal and for changing the gain of the driving circuit in response to a second control signal. The gain of the driving circuit is increased during a moving control mode (i.e. a seek mode) and decreased during a position control mode (i.e. a track-following mode).

REFERENCES:
patent: Re32075 (1986-01-01), Harrison et al.
patent: 4535372 (1985-08-01), Yeakley
Palmer, Voltage Boost Circuit for Servo Power Amplifier, IBM Technical Disclosure Bulletin, vol. 17, No. 9, pp. 2752-2753 (2/75).
Peripheral Circuit Technology for 800MB Disk Storage Drive; by Shuichi Takanami, Hiroshi Naranishi, and Ryoichi Arai (1979).
Commander et al., "Servo Design for an Eight-Inch Disk File," IBM Disk Storage Technology, pp. 89-97, Feb. 1980.

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