Tangential Disc Tilt Measurement and Corrective Action
AssigneeKoninklijke Philips Electronics N.V.
InventorCoen Adrianus Verschuren
Life of this patent
Estimating the term…
Abstract
A method and system within optical disc player/recorders that measures tangential disc tilt and provides for responsive action. Optical discs inevitably show some degree of warping. By determining the tangential tilt angles over the disc and comparing these tilt angles with a prescribed maximum allowed tilt angle, responsive actions are taken if the maximum tilt angle is exceeded to stop operation or adjust the tangential lens tilt to compensate for the tangential disc tilt usig with a bandwidth suitable for high rotational speeds.
Claims24
A method for handling tilt within optical disc systems comprising:
- determining a tangential tilt angle for an optical media within an optical disc system using a measurement for axial runout for the optical media;
- comparing the tilt angle with a predetermined threshold;
- and
- responding to the comparing step by compensating for the tilt angle or not allowing the optical media to be used within the optical disc system if the predetermined threshold is met.
An optical disc system for handling tilt comprising:
- a tangential tilt angle determination device that uses a measurement for axial runout for an optical media to determine the tangential tilt angle of optical disc;
- a comparison mechanism that compares the tangential tilt angle with a predetermined threshold;
- and
- a compensation device that responds to the result of the comparison mechanism to correct for the tilt angle or not allow the optical media to be used within the optical disc system if the predetermined threshold is met.
Dependencies are inferred from the claim text.