RU96106416A - METHOD FOR MOVING AN OPTICAL HEAD WHEN SEARCHING A ROAD ON A MEDIA AND A DEVICE FOR CARRYING OUT THE METHOD (OPTIONS) - Google Patents

Claims (4)

1. The method of moving the optical head from the initial track (10) to a given track (11) on a storage medium containing data arranged on its tracks (3), characterized in that it includes determining the number of track intersections, indicating the number of tracks (3) between the initial track (10) and the predetermined track (11), moving the optical head from the initial track (10) to the predetermined track (11), measuring the light reflection coefficient from the information carrier (1), generating a tracking error signal in response to the indicated values of the coefficient reflection coefficient, and the tracking error signal (20) has zero-level intersections of the first type (21) corresponding to the intersection of one of the tracks (3) by the optical head and second-level intersections of the second type (23), corresponding to changes in the reflection coefficient in response to the aforementioned data, generating a data indicator signal based on a reflection coefficient value, wherein the data indicator signal (24) has indicator points corresponding to intersections of the second level of the second type (23), an increase in the number of counting GOVERNMENTAL tracks at each zero crossing of the first type (21) and termination of movement of the optical head when the track count number becomes equal to said track crossing number.  2. A method of moving an optical head from an initial track (10) to a predetermined track (11) on a storage medium (1) containing data arranged on its tracks (3), characterized in that it includes determining the number of intersections of the tracks indicating the number of said tracks (3) between the initial (10) and the specified track (11), moving the optical head from the initial track (10) to the specified track (11), measuring the light reflectance from the storage medium (1), generating a signal of the data indicator in response to indicated values of coefficient a reflection index, wherein the data indicator signal (35) has indicator points corresponding to changes in the reflection coefficient values in response to said data, generating a tracking error signal in response to said reflection coefficient values and a data indicator signal, the tracking error signal (41) having intersections zero level (44), corresponding to the optical head crossing one of the tracks (3), and segments (43) of constant amplitude, corresponding to indicator points, an increase in the number of counted tracks when each zero crossing (44) and stopping the optical head moving when the number of track counts becomes equal to the indicated number of track intersections.  3. A device for moving an optical head from an initial track (10) to a predetermined track (11) on a storage medium (1) containing data arranged on its tracks (3), characterized in that it contains a sensor (14) for measuring the coefficient value light reflection from the information carrier (1), a tracking error signal generator (17), designed to generate, in response to the value of the reflection coefficient of the tracking error signal (20), having zero level intersections of the first type (21, 23), a preamplifier (15), intended for development in On the reflection coefficient value of the data signal, indicating changes in the reflection coefficient value in response to the mentioned data, the track intersection signal generator (18), designed to generate, in response to the tracking error signal, a digital track intersection signal having a second level zero crossing (27, 28), corresponding to the indicated zero-level intersections of the first type (21, 23), and the track / block state selector (16), which, in response to the data signal, provides a blocking of generation in the signal generator and the intersection of said track zero-crossings of the second type (28) when the data signal indicates changes in said value of the reflection coefficient in response to said data.  4. A device for moving an optical head from an initial track (10) to a predetermined track (11) on a storage medium (1) containing data arranged on its tracks (3), characterized in that it contains a sensor (14) for measuring the coefficient value light reflection from the information carrier (1), a preamplifier (15), designed to generate, in response to the specified value of the reflection coefficient of the data signal, indicative of a change in the value of the reflection coefficient in response to the specified data, the tracking error signal generator (32), is intended started to generate in response to the indicated value of the reflection coefficient of the tracking error signal (41) having zero-level intersections of the first type (44), the track / block state selector (31), which provides, in response to the specified data signal, the generation of a tracking error signal in the generator (32) a constant amplitude signal (43) during a predetermined time interval when the data signal indicates changes in the specified value of the reflection coefficient in response to the specified data, and the generator of the intersection signal to horns (33), designed to generate, in response to a tracking error signal, a digital track intersection signal having a second level zero intersection (46) corresponding to said first level zero intersection (44).