Patent ID: 7382697
Filing Date: 2008-06-03
Classification: G11B

Abstract:
1. An optical disk apparatus comprising: a moving device for moving a pickup head in a radial direction of an optical disk, the pickup head for reading data recorded on the optical disk by irradiating the optical disk set in an apparatus body with a laser beam and detecting the beam reflected therefrom, a seek control device for controlling movement of the pickup head by the moving device during seek of jumping a data reading position on the optical disk, and a reproducing device for creating and outputting a reproduced signal based on the data read from the optical disk by the pickup head, further comprising a speed information storage device for storing speed information composed of information of a maximum speed which is an upper limit of the moving speed of the pickup head during seek and information indicative of that the maximum speed is a marginal speed, both items of information being correlated with each other according to the kind of the optical disk, wherein the seek control device counts a number of tracks jumped by using the speed information stored in the speed information storage device according to the kind of the optical disk set in the apparatus body, while the seek control device controls the movement of the pickup head by the moving device so that that the moving speed of the pickup head during seek does not exceed the maximum speed, wherein the seek control device acquires a difference between the number of tracks actually jumped when jumping is completed and the number of tracks counted this time, wherein, when the difference acquired is smaller than a determining number of tracks computed by multiplying the number of tracks actually jumped by a prescribed ratio, if the pickup head has been moved at the maximum speed during the present jumping, the seek control device updates the corresponding maximum speed of the pickup head stored in the speed information storage device to a speed incremented by a first prescribed magnitude, and wherein, when the difference acquired is larger than the determining number of tracks, if the corresponding maximum speed of the pickup head stored in the speed information storage device is not the marginal speed and if the pickup head has been moved at the maximum speed during the present jumping, the seek control device updates the corresponding maximum speed of the pickup head stored in the speed information storage device to a speed decremented by a second prescribed magnitude; and wherein if the corresponding maximum speed of the pickup head stored in the speed information storage device is not the marginal speed, the seek control device sets the maximum speed for the marginal speed.