| 摘要 |
In a disc discrimination device provided with a disc apparatus on which a plurality of types of disc can be loaded, when a disc D is loaded on a turntable, detection light is irradiated from light irradiation means 3 and light receiving means 4 receives the light reflected from a recording surface. Since the distance from the front surface Da of the disc to the recording surface thereof is different depending upon a type of disc, the type of the disc can be discriminated depending upon the difference between the thicknesses of the protective layer of the disc by obtaining the difference between the ranges of the light beam of reflected light {circle around (1)} and {circle around (2)}. Further, the difference between the reflection factors of the light on the recording surface can be determined by the output from addition means 6, whereby many types of disc can be discriminated. With this arrangement, the disc apparatus can promptly and simply discriminate a type of disc loaded thereon.
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