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公开(公告)号：US4001500A
公开(公告)日：1977-01-04
申请号：US525694
申请日：1974-11-21
申请人： Lawrence P. Lavery , David R. Shuey
发明人： Lawrence P. Lavery , David R. Shuey
CPC分类号： H04N1/4076 , H04N1/403
摘要： A video amplifier for use in a document scanning system to provide signals representative of the information content of a scanned document. The amplifier includes an automatic background control portion and an automatic black level adjustment portion to maintain the integrity of the output voltage range independent of the background of the scanned document and throughout the period of time required to scan the entire document. In addition, circuitry is provided for varying the time constant of the automatic background control circuitry to make that circuitry respond quickly to changes of the background toward the "white" direction. Further, the normally white platen back is provided with a gray leading edge to prevent the automatic background control circuitry from being upset by initial runs of white in the event of an imperfectly registered non-white document.
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公开(公告)号：US3935532A
公开(公告)日：1976-01-27
申请号：US532797
申请日：1974-12-16
摘要： An electrometer system particularly adapted for non-contact measurement of electrostatic charges in electrostatography, such as the charge level on photoreceptor surface areas in xerographic machines. The electrometer circuit has a very high impedance normally floating input, and a simple D.C. measurement circuit. The measurement circuit output can be read by a conventional test meter. The electrometer is controlled by a simple switching arrangement providing an automatic zeroing position in which the initial level of the input circuit is automatically reset by a feedback amplifier from the output to compensate for any temperature induced or other variations in the measurement circuit. The power supply voltage is automatically monitored and the output meter is driven to a non-zeroing position in response to a low supply voltage.
摘要翻译： 一种静电计系统，特别适用于在静电照相术中非接触式测量静电电荷，例如静电复印机中感光体表面区域的电荷水平。 静电计电路具有非常高的阻抗正常浮动输入，以及简单的直流测量电路。 测量电路输出可以由传统的测试仪读取。 静电计由简单的开关装置控制，提供自动归零位置，其中输入电路的初始电平由反馈放大器从输出端自动复位，以补偿测量电路中的任何温度感应或其他变化。 自动监测电源电压，并响应于低电源电压将输出仪驱动到非归零位置。
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公开(公告)号：US4434353A
公开(公告)日：1984-02-28
申请号：US306985
申请日：1981-09-30
申请人： Dana G. Marsh , David R. Shuey , John L. Webb
发明人： Dana G. Marsh , David R. Shuey , John L. Webb
CPC分类号： G03G15/201
摘要： An apparatus which includes a plurality of heating elements to fuse a powder image onto a copy sheet. Selected heating elements of the apparatus are energized in an ordered sequence corresponding to the surface area of the powder image being fused.
摘要翻译： 一种包括多个加热元件以将粉末图像熔合到复印纸上的装置。 设备的选定加热元件以对应于被熔化的粉末图像的表面积的有序序列通电。
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4.发明授权Shielded electrometer whose output is used to control width of pulses fed back to the shield and associated battery test circuitry 失效屏蔽静电计，其输出用于控制反馈到屏蔽和相关电池测试电路的脉冲宽度
公开(公告)号：US4127806A
公开(公告)日：1978-11-28
申请号：US783910
申请日：1977-04-01
CPC分类号： G01R29/24 , G01R31/2841 , G01R35/00
摘要： An electrometer having reduced spacing sensitivity, with the electrometer including a probe with a charge receiving sensor element and a surrounding shield. A voltage equivalent to that sensed by the probe element is fed back to the shield to render the electrometer substantially spacing insensitive. A duty cycle control regulates the width of electrical pulses to a power transformer whose output is fed back to the probe shield to maintain the spacing insensitivity. Means are also provided to automatically test and calibrate the electrometer prior to use.
摘要翻译： 具有降低的间隔灵敏度的静电计，静电计包括具有电荷接收传感器元件和周围屏蔽的探针。 与探针元件感测到的电压相当的电压反馈到屏蔽层，使静电计基本间隔不敏感。 占空比控制将电脉冲的宽度调节到电源变压器，其输出反馈到探头屏蔽以保持间距不敏感。 还提供了在使用前自动测试和校准静电计的方法。
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