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51. 发明授权

US4015077A Facsimile transmitter having improved response 失效
标题翻译：具有改进响应的传真发射机
公开(公告)号：US4015077A
公开(公告)日：1977-03-29
申请号：US606507
申请日：1975-08-21
申请人： Richard L. Nelson
发明人： Richard L. Nelson
IPC分类号： H04N1/407 , H04N1/029 , H04N1/409 , H04N1/02
CPC分类号： H04N1/029 , H04N1/4092 , H04N1/4097
摘要： A facsimile transmitter detects dark-light variations in an illuminated document by means of a photodetector. Fiber optics form an optical path from the illuminating means to the document and from the document to the photodetector means with filter means being located in the optical path for attenuating light in the near infrared region of the spectrum. Amplifier means are coupled to the photodetector means and automatic gain control means are associated with the amplifier means for increasing the gain of the amplifier in response to a lesser amount of light detected by the photodetector. The gain control means is adjustable so as to limit the increase in gain when detecting dark regions. Lead networks are coupled to the amplifier means to increase the speed of response to dark-light variations in the document.
摘要翻译：传真发射机通过光电检测器检测照明文件中的暗光变化。光纤形成从照明装置到文件以及从文件到光电检测器装置的光路，滤光器装置位于光路中，用于衰减光谱的近红外区域的光。放大器装置耦合到光电检测器装置，并且自动增益控制装置与放大器装置相关联，用于响应于由光电检测器检测到的较少量的光增加放大器的增益。增益控制装置是可调节的，以便在检测到暗区时限制增益的增加。引线网络耦合到放大器装置以增加对文档中暗光变化的响应速度。

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