Method and apparatus for determining an optical disc type
AssigneePioneer Electronic Corporation
InventorsYoshiyuki Tsukai, Masanori Suzuki
Life of this patent
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Abstract
A method and apparatus for determining an optical disc type. A light beam is directed at an optical disc, and a focal point of the light beam moves in a focus direction with respect to the optical disc. An intensity of a reflection of the light beam from the optical disc is detected during the movement of the focal point of the light beam. A time interval between occurrences of a plurality of peaks of the detected intensity of the reflected light beam is detected, and the optical disc type is determined according to the detected time interval.
Claims10
A method for determining an optical disc type, comprising the steps of:
- directing a light beam at an optical disc;
- moving a focal point of the light beam in a focus direction with respect to the optical disc;
- detecting an intensity of a reflection of the light beam from the optical disc during the step of moving the focal point of the light beam;
- detecting a time interval between occurrences of a plurality of peaks of the detected intensity of the reflected light beam;
- and
- determining the optical disc type according to the detected time interval.
An apparatus for determining an optical disc type, comprising:
- means for directing a light beam at an optical disc;
- means for moving a focal point of the light beam in a focus direction with respect to the optical disc;
- means for detecting an intensity of a reflection of the light beam from the optical disc during the movement of the focal point of the light beam;
- means for detecting a time interval between occurrences of a plurality of peaks of the detected intensity of the reflected light beam;
- and
- means for determining the optical disc type according to the detected time interval.
Dependencies are inferred from the claim text.