发明名称 |
DETECTOR FOR SHEET OF PAPER |
摘要 |
A high contrast ratio sensor is provided by introducing a pair of photodetectors into the sensor circuitry. One of the detectors is a diffuse detector and the other is either a reflective or transmittance detector. The two photodetectors are connected in a manner to cause the diffuse detector output to subtract from the reflective (or transmissive) detector output. This subtraction of signals provides a high contrast ratio. In a first embodiment, a diffuse detector and a reflectance detector are located on the same side of the paper as the emitter light and in a second embodiment a diffuse detector and a transmittance detector are located on opposite sides of the paper to be sensed. |
申请公布号 |
JPS59142487(A) |
申请公布日期 |
1984.08.15 |
申请号 |
JP19840008411 |
申请日期 |
1984.01.20 |
申请人 |
XEROX CORP |
发明人 |
TEIMOSHII EMU MAINAADO;ROBAATO II KURAMURIN |
分类号 |
B65H7/14;B41J11/00;G01N21/47;G01S7/481;G01V8/20;G03G15/00 |
主分类号 |
B65H7/14 |
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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