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公开(公告)号：US06611666B2
公开(公告)日：2003-08-26
申请号：US09882196
申请日：2001-06-15
IPC分类号： G03G1500
CPC分类号： G01J1/32 , B41J29/393 , G01J1/26 , G01J3/50 , G01J3/501 , G03G15/01 , G03G2215/00042 , G03G2215/00063
摘要： A method and apparatus for a single densitometer design that is used for all colors within multiple color image processing system. The preferred embodiment employs an LED having a light adjustment mechanism for controlling the amount of light received by a light detector in the densitometer. The coarse light adjustment is provided through a variable aperture. Fine light adjustment is accomplished through controlling the current through the LED, either by a potentiometer or through an automated process. Preferably, each of the LEDs is selected by wavelength to maximize the absorption by the colorant yielding light roughly complimentary to the colorant. The adjustment circuit provides advantage in color printing systems by allowing duplicate versions of the same densitometer circuit to yield similar voltage outputs for different colorants, thereby compensating for different absorption characteristics and light output of different colored LEDs.
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公开(公告)号：US06427057B1
公开(公告)日：2002-07-30
申请号：US09737320
申请日：2000-12-14
IPC分类号： G03G1500
CPC分类号： G03G15/5041 , G01N21/5907 , G03G2215/00042
摘要： This invention provides an image-forming machine with a pulse densitometer that avoids the formation of artifacts on electrophotographic films. The image-forming machine may have a charger, an exposure machine, a toning station, a transfer charger, a fusing station, and a densitometer positioned next to a photoconductor. The densitometer may have an emitter, a collector, and a pulse apparatus. The densitometer provides one or more pulses to measure the toner and photoconductor densities. The pulsed emissions are essentially below the exposure threshold of electrophotographic films, especially those sensitive to the infrared spectral region.
摘要翻译： 本发明提供一种具有脉冲密度计的图像形成机，其避免在电子照相胶片上形成伪影。 图像形成机可以具有位于感光体旁边的充电器，曝光机，调色台，转印充电器，定影台和密度计。 密度计可以具有发射极，集电极和脉冲装置。 密度计提供一个或多个脉冲来测量调色剂和感光体密度。 脉冲发射基本上低于电子照相胶片的曝光阈值，特别是对红外光谱区敏感的那些。
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公开(公告)号：US06385411B1
公开(公告)日：2002-05-07
申请号：US09687647
申请日：2000-10-13
IPC分类号： G03G1500
CPC分类号： G03G15/5041 , G03G2215/00042
摘要： The invention provides a diagnostic system for a densitometer in an image-forming machine. An image-forming machine with a densitometer diagnostic system may have a photoconductor, one or more chargers, an exposure machine, a toning station, and a densitometer. A densitometer diagnostic system for an image-forming machine may have an emitter, a collector, amplifier circuitry, and diagnostic circuitry. The diagnostic circuitry reduces the drive current to the emitter in the densitometer by a known or calculable value. The output voltage from the amplifier circuitry in the densitometer is reduced in proportion to the reduction in the drive current. To perform diagnostic testing of the densitometer, a first output voltage is obtained from the densitometer without the diagnostic circuitry connected. A second output voltage is obtained from the densitometer with the diagnostic circuitry connected. When the difference in first and second output voltages matches an output voltage specification, the densitometer is functional. The diagnostic circuitry may be removed from the densitometer when not in use. Alternatively, the densitometer may have a switch to disconnect the diagnostic circuitry when not in use.
摘要翻译： 本发明提供了一种用于图像形成机中的密度计的诊断系统。 具有光密度计诊断系统的图像形成机可以具有光电导体，一个或多个充电器，曝光机，调色台和密度计。 用于图像形成机的密度计诊断系统可以具有发射器，集电极，放大器电路和诊断电路。 诊断电路通过已知或可计算的值来减小密度计中的发射器的驱动电流。 来自密度计中的放大器电路的输出电压与驱动电流的减小成正比地减小。 要进行密度计的诊断测试，可以从密度计获得第一个输出电压，而不需要连接诊断电路。 从诊断电路连接的密度计获得第二个输出电压。 当第一和第二输出电压的差异与输出电压规格一致时，密度计是有效的。 当不使用时，诊断电路可以从密度计移除。 或者，密度计可以具有在不使用时断开诊断电路的开关。
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公开(公告)号：US06225618B1
公开(公告)日：2001-05-01
申请号：US09185926
申请日：1998-11-04
IPC分类号： H01J4014
CPC分类号： G03G15/5041 , G01N21/5907
摘要： An auto-ranging densitometer is disclosed for determining the density of a test sample, wherein the densitometer includes a photodetector and an amplifier circuit adapted to produce an output signal proportional to intensity of light on the photodetector. The amplifier circuit has multiple gains that successively increase in an approximately 2:1 ratio increment. An analog to digital converter is adapted to convert the output signal of the amplifier circuit to digital format. A density signal generator circuit is adapted to receive the output of the analog to digital converter, whereby density resolution non-uniformity is minimized due to small gain increments such that the analog to digital converter needs deal with less extreme variations in density resolution.
摘要翻译： 公开了一种用于确定测试样品的密度的自动测距密度计，其中所述密度计包括光电检测器和适于产生与所述光电检测器上的光强度成比例的输出信号的放大器电路。 放大器电路具有以大约2:1的比例增量连续增加的多个增益。 模数转换器适于将放大器电路的输出信号转换为数字格式。 密度信号发生器电路适于接收模数转换器的输出，由此由于小的增益增量使得密度分辨率不均匀性最小化，使得模数转换器需要处理密度分辨率的较小极端变化。
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公开(公告)号：US06222176B1
公开(公告)日：2001-04-24
申请号：US09185842
申请日：1998-11-04
IPC分类号： H01J4014
CPC分类号： G01N21/5907 , G01N21/27
摘要： An auto-ranging densitometer includes a photodetector and an amplifier circuit adapted to produce an output signal proportional to intensity of light on the photodetector. The amplifier circuit has multiple gains that successively increase. An analog to digital converter converts the output signal of the amplifier circuit to digital format. A gain select logic outputs a gain code used to select the gain of the amplifier. A density signal generator circuit includes two LUTs, one of the LUTs being adapted to receive the output of the analog to digital converter and produce an output density scaled to include only low order bits; and the other of the LUTs being to receive the gain code and produce an output density scaled to include only high order bits. The outputs of the two LUTs are concantenation added to produce a summation density signal.
摘要翻译： 自动测距密度计包括光电检测器和放大器电路，其适于产生与光电检测器上的光强度成比例的输出信号。 放大器电路具有连续增加的多个增益。 模数转换器将放大器电路的输出信号转换成数字格式。 增益选择逻辑输出用于选择放大器增益的增益码。 密度信号发生器电路包括两个LUT，其中一个LUT适于接收模数转换器的输出，并产生一个缩放以仅包括低阶位的输出密度; 并且LUT中的另一个是接收增益代码并产生被缩放以仅包括高阶位的输出密度。 两个LUT的输出是相加的结果以产生求和密度信号。
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