Optical disk device and method for controlling head movement the

Details Optical disk device and method for controlling head movement the Optical disk device and method for controlling head movement the

1993-10-12

1994-12-20

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369 4434, 369 4435, 369 51, G11B 709

Patent

active

053751086

ABSTRACT:
An optical disk device having a head for reading information from a disk having tracks of different pitches depending upon a radial position on the disk. The device comprises: a unit for detecting the number of track where the head is being located from a reading signal of the optical disk; a unit for calculating the track pitch at the present time from the track number; a unit for detecting the relative velocity of the optical disk with respect to the track from the reading signal; a unit for detecting the velocity of the optical head at the present time by multiplying the relative velocity to the track pitch at the present time; and a unit for calculating the reference velocity in such a way that an object track number data is transformed to a data based on radius of the disk, that the track number data at the present time is transformed to a data based on radius of the disk and that the length between the object track and the track at the present time is calculated by subtracting the transformed track number data from the transformed object track number data.

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Kazuhisa Koumura, et al., "High Speed Accessing By Direct Accessing", Proc. Int. Symp. on Optical Memory, 1989, Japanese Journal of Applied Physics, vol. 28 (1989) Supplement 28-3, pp. 73-76.

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