发明名称 |
Process for controlling discs |
摘要 |
A disc is directly illuminated so that a coating layer on the disc reflects the light. The disc may be a compact disc or a CD-ROM. The degree of reflection of the reflected light is determined and intermediately stored. The detected value is compared with the corresp. values for a comparison disc. The comparison results are used to determine whether the disc is in order or defective according to the preset tolerance limits. |
申请公布号 |
EP0770868(A1) |
申请公布日期 |
1997.05.02 |
申请号 |
EP19960114961 |
申请日期 |
1996.09.18 |
申请人 |
SIEMENS AKTIENGESELLSCHAFT |
发明人 |
BIEDERMANN, ERNST, DIPL.-PHYS. |
分类号 |
G01N21/88;G01J1/04;G01N21/93;G01N21/95;G01N21/956;G01R31/265;G11B7/26;H01L21/027;H01L21/66 |
主分类号 |
G01N21/88 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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