Method and apparatus for controlling the speed of a movable...

Details Method and apparatus for controlling the speed of a movable... Method and apparatus for controlling the speed of a movable...

Category

G - Physics

Subcategory

11

Subsubcategory

B

CPC

352/21, 352/32.2

IPC codes

G11B 7/00 (2006.01)

Type

Patent

Patent number

CA 1132257

Description

ABSTRACT Method and apparatus for controlling the speed of an information storage medium, such as a disc- shaped record carrier, relative to a device for recovering information recorded thereon. The disc includes a plurality of substantially parallel infor- mation tracks arranged in a spiral or in concentric circles, and information recorded thereon includes a pilot signal having a predetermined frequency. The apparatus includes means for comparing the phase angle of the recoverer pilot signal with the phase angle of a locally generated reference signal, to produce an error signal for controlling the angular velocity of a spindle motor that rotates the disc. The pilot signal includes an equal integral number of cycles on each information track, so its phase angle is aligned on adjacent tracks and the apparatus can continue to operate even when the information recovering device is traversing the disc from one track to another or is not critically positioned with respect to an individual information track.

Application Number

341420

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