Optical disc discriminating method and optical disc discriminating apparatus
AssigneeMitsubishi Electric Corporation
InventorHironori Nakahara
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Abstract
An optical disc discriminating method and an optical disc discriminating apparatus which can discriminate a type of optical disc with a simple configuration, causes a drive means to vary an incident angle of a laser light beam with respect to an optical disc while irradiating the optical disc with the laser light beam from a light beam generating section, causes a photodetector to detect a diffraction light of the laser light beam from a recording track of the optical disc, detects a value corresponding to the incident angle when the diffraction light is detected, and discriminates the type of the optical disc on the basis of the detected value.
Claims28
An optical disc discriminating method of discriminating a type of optical disc which is loaded into an optical disc apparatus, the optical disc discriminating method comprising the steps of:
- varying, by an incident angle varying unit, an incident angle of a laser light beam with respect to an optical disc while irradiating the optical disc with the laser light beam from a light beam generating unit;
- detecting, by an incident angle detecting unit, a value corresponding to the incident angle when a diffraction light of the laser light beam from a recording track formed on an information recording surface of the optical disc is detected by a photo-detecting unit;
- and
- discriminating the type of the optical disc on the basis of the detected value.
An optical disc discriminating apparatus discriminating a type of optical disc which is loaded into an optical disc apparatus, the optical disc discriminating apparatus comprising:
- a light beam generating unit generating a laser light beam, with which the optical disc is irradiated;
- an incident angle varying unit varying an incident angle of the laser light beam with respect to the optical disc;
- a photo-detecting unit;
- an incident angle detecting unit detecting a value corresponding to the incident angle;
- and
- a control unit which causes the incident angle varying unit to vary the incident angle of the laser light beam with respect to the optical disc while irradiating the optical disc with the laser light beam from the light beam generating unit, and which discriminates the type of the optical disc on the basis of the value corresponding to the incident angle when a diffraction light of the laser light beam from a recording track formed on an information recording surface of the optical disc is detected by the photo-detecting unit.
Dependencies are inferred from the claim text.