Disk size detecting circuit

Details Disk size detecting circuit Disk size detecting circuit

1985-03-18

1987-03-24

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Mechanism condition or storage medium responsive control

318312, 318318, 318327, 369190, 369243, G11B 1928, G11B 360

Patent

active

046530401

ABSTRACT:
In a disk size detecting circuit, the size of a disk is determined according to the speed of a motor adapted to rotate the disk and the angle through which motor has rotated after the start thereof. A counter, which is reset with the signal which starts the operation of the motor, counts pulses indicative of the amount of rotation of the motor. A rotational speed detector circuit, which may take the form of a frequency-to-voltage converter followed by a voltage comparator or a frequency counter followed by a digital comparator, produces a signal indicating the rotational speed of the motor. The output of the counter and the output of the rotational speed detector are applied to a circuit which discriminates the size of the disk according to the two signals.

REFERENCES:
patent: 4302833 (1981-11-01), Tanaka et al.

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