Optical disc device
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTakashi Kishimoto, Yuu Okada, Katsuya Watanabe
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Abstract
An optical disc device with high reliability, which is capable of performing a stable track jumping, is provided. In the optical disc device, a space (time interval) between an address part and the next address part in the address space measuring part 116 inside the DSP 111 is measured, and when the reproduction speed detected in the reproduction speed detection part 117 based on the measuring result is faster than a predetermined reproduction speed, an application timing of an accelerating pulse is switched in the accelerating/decelerating pulse generator 113 such that the application timing of an accelerating pulse or a decelerating pulse is matched with a transit timing in the address part.
Claims27
An optical disc device comprising shifting means for shifting a convergent point of an optical beam focused on an information carrier in which an information track is divided in a radial direction and has an address part in a direction crossing the track on the information carrier,
- track displacement detection means for generating a signal corresponding to a relative position between the convergent point of the optical beam and the track,
- tracking control means for driving the shifting means according to an output signal from the track displacement detection means and controlling the convergent point of the optical beam to scan a surface of the track,
- track jumping means for shifting the convergent point of the optical beam from an arbitrary track to another track on the information carrier,
- jumping starting means for operating the track jumping means and starting an application of an accelerating signal, and
- reproduction speed measuring means for measuring a speed at which information on the information carrier is read out,
- wherein the jumping starting means operates the track jumping means based on a position of the address part on the information carrier and a measuring result from the reproduction speed measuring means.
Dependencies are inferred from the claim text.