Disc discrimination device and disc discrimination

专利名称：Disc discrimination device and disc

discrimination method

发明人：Togashi, Mitsuhiro,Okada, Hirobumi申请号：EP98300932.5申请日：19980209公开号：EP0860822A1公开日：19980826

专利附图：

摘要：In a disc discrimination device (1) provided with a disc apparatus on which aplurality of types of disc can be loaded, when a disc D is loaded on a turntable, detectionlight 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)ofthe disc to the recording surface thereof is different depending upon a type of disc, thetype of the disc can be discriminated depending upon the difference between thethicknesses of the protective layer of the disc by obtaining the difference between theranges of the light beam of reflected light ① and ②. Further, the difference between thereflection factors of the light on the recording surface can be determined by the outputfrom addition means(6) whereby many types of disc can be discriminated. With thisarrangement, the disc apparatus can promptly and simply discriminate a type of discloaded thereon.

申请人：ALPS ELECTRIC CO., LTD.

地址：1-7 Yukigaya Otsuka-cho Ota-ku Tokyo 145 JP

国籍：JP

代理机构：Kensett, John Hinton

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