Track counter for optical disk

Details Track counter for optical disk Track counter for optical disk

1989-12-28

1991-03-19

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Applications

Counting on an object, areas having alternating physical...

377 49, 369 32, 369 4425, 369 4426, 360 7804, G11B 2110

Patent

active

050017322

ABSTRACT:
The track counter for optical disk in accordance with the present invention, that counts the number of tracks a light beam passes upon when an optical head moves over an optical disk in the radial direction, comprises a passage signal generating circuit for detecting based on a reflected light of the light beam from the optical disk, that the light beam passed upon a track and for releasing a passage signal on that occasion, a counter that counts the passage signals released by the passage signal generating circuit, a count suspending circuit for forecasting that the light beam will pass upon a specific position of a track and for suspending the count by the aforementioned counter of the passage signals during this forecasted period, and a count value compensating circuit for assuming, when the count of the passage signals is suspended by the count suspending circuit, the number of tracks the light beam passed upon during that period, and for adding this assumed number to the count value of the counter. This track counter for optical disk is arranged such that it is able to count accurately the number of tracks the light beam passed upon even when the light beam passed upon the ID sections of a track, or when the passage upon a track cannot be detected because of a scratch on the surface of the disk or the like. Thereby, when the optical head moves and slides, the access speed may be enhanced.

REFERENCES:
patent: 4623943 (1986-11-01), Osada et al.
patent: 4775967 (1988-10-01), Shimada et al.
patent: 4811316 (1989-03-01), Hosuya
patent: 4845697 (1989-07-01), Giddings
patent: 4924483 (1990-05-01), Cho
patent: 4995989 (1987-09-01), Kimoto

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