| 摘要 |
A track counter for counting the number of tracks a light beam traverses when an optical head moves over an optical disk in the radial direction, comprises apassage signal generating circuit employing a reflection of said light beam from said optical disk, for detecting that the light beam has traversed a track and for releasing a passage signal on that occasion, a counter for counting the passage signals released by the signal generating circuit, a count suspending circuit for forecasting that the light beam will traverse a specific position of a track and for suspending the count of aforementioned counter during this forecast period, and a count value compensating circuit for calculating, while the count of the passage signals is suspending by the count suspending circuit, the number of tracks the light beam traversed during this period, and for adding this calculated number to the count value of said counter. This track counter is arranged to provide an accurate count of the number of tracks traversed and to compensate both for ID sections and surface scratches. Access speed of the optical head is thus enhanced.
|
