| 摘要 |
An optical disc drive according to the present invention may be loaded with an arbitrarily selected one of optical discs of multiple types including a first optical disc with grooves and a second optical disc with no grooves. The optical disc drive includes: an optical system for irradiating the recording side of the loaded optical disc 1 with a laser beam; a light detecting section 7, which receives reflected light from the optical disc 1 to generate a first output signal representing the quantity of at least a part of the light reflected from an inside portion of the optical disc 1 and a second output signal representing the quantity of at least a part of the light reflected from an outside portion of the optical disc 1; a spot location control section 10 for shifting the spot location of the laser beam on the optical disc across recording tracks on the optical disc 1; and a disc type recognizing section 13 for determining, by an upper envelope signal of at least one of the first and second output signals, whether the loaded optical disc 1 has grooves or not.
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