| 发明名称 |
Optical path monitoring circuit for a document scanner |
| 摘要 |
The light levels reflected from a predetermined blank portion of an optically scanned document are monitored. The presence of dirt or smudges in the optical path which could adversely affect the validity of the information read from the document.
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| 申请公布号 |
US4356390(A) |
申请公布日期 |
1982.10.26 |
| 申请号 |
US19810242755 |
申请日期 |
1981.03.11 |
| 申请人 |
WESTINGHOUSE ELECTRIC CORP. |
发明人 |
FEILCHENFELD, MICHAL M. |
| 分类号 |
G06K9/03;G06K7/00;G06K9/20;G06K9/40;(IPC1-7):G06K9/00 |
主分类号 |
G06K9/03 |
| 代理机构 |
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