Magnetic head positioning device for a flexible disk

Details Magnetic head positioning device for a flexible disk Magnetic head positioning device for a flexible disk

1985-06-19

1986-12-30

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, 318685, 318696, G11B 2108

Patent

active

046333460

ABSTRACT:
A bead positioning apparatus includes a carriage for moving a magnetic head to a specified position of data tracks in a storage medium, a motor for driving the carriage depending on excitation pulses from a step motor, a light shielding plate mounted on the carriage, a light-emitting element, a light-sensitive element opposing to the light-emitting element through the light shielding plate and a position-judging device for judging the position of the magnetic head depending on the excitation pulses of the step motor and a signal of the light-sensitive element generated when light is shielded by the light-shielding plate, wherein the light-emitting element and the light-sensitive element are connected to a power source through a common switching element and the position-judging device outputs a signal, when the switching element is turned off, which is the same signal as if the light-sensitive element were device sensing light. The switching element being turned off represents a stand-by mode which is a power saving feature.

REFERENCES:
patent: 4325016 (1982-04-01), Takeuchi
IBM TDB vol. 24, No. 7A "Head Loader Control Circuit" Hanley, 12/81, pp. 3162-3163.

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