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1. 发明授权

US06175375B1 Method and apparatus for compensating for a darkness shift during the life of an electrophotographic printer cartridge 有权
标题翻译：用于在电子照相打印机墨盒的寿命期间补偿黑暗偏移的方法和装置
公开(公告)号：US06175375B1
公开(公告)日：2001-01-16
申请号：US09491323
申请日：2000-01-25
申请人： Douglas Anthony Able , Cyrus Bradford Clarke , Mark Edwin Kirtley Lund , Daniel George Mlejnek , George Peter Olson , Gregory Lawrence Ream , Thomas Campbell Wade
发明人： Douglas Anthony Able , Cyrus Bradford Clarke , Mark Edwin Kirtley Lund , Daniel George Mlejnek , George Peter Olson , Gregory Lawrence Ream , Thomas Campbell Wade
IPC分类号： G03G1500
CPC分类号： G03G21/1889 , G03G15/50 , G03G2221/1823 , G03G2221/183 , H04N1/40006 , H04N1/407
摘要： An improved EP printer will automatically compensate for printer output darkness shift over the usage life of one or more components of the print engine. In many EP print engines, the printer output darkness without correction will gradually change as the components are used, and typically, the darkness will increase to an extent that is perceptible. The printer output darkness can be controlled using a EP operating point that changes certain operating parameters, such as the laser diode current, the duty cycle of the video data signals driving the laser diode, and other voltage parameters including the charge roller voltage, or the developer bias voltage. It is desirable to make adjustments over the usage life of these components, so as to maintain the initial printer output darkness throughout the life of the major system components. The adjustments can occur at periodic intervals based upon a metric that includes one or more of the following parameters: number of pels produced, number of pages printed, number of cycles of one or more components of the print engine, and/or the consumption of toner in grams. The adjustment information can be provided as look-up tables, or in the form of transfer functions. If look-up tables are used, the adjustment control algorithm could be one that interpolates between periodically-adjusted usage values stored in the look-up tables. Since many EP process cartridges tend to print darker rather than lighter over the life usage of that process cartridge, the present invention will accomplish two important goals by utilizing the methodology described above; not only will the printer output darkness be maintained at a substantially constant value, but the actual number of pels printed and pages printed will be increased by use of the same quantity of toner stored within the replaceable process cartridge.
摘要翻译：改进的EP打印机将自动补偿在打印引擎的一个或多个部件的使用寿命内的打印机输出暗度偏移。在许多EP打印引擎中，打印机输出黑暗而不进行校正将随着使用组件而逐渐改变，并且通常黑暗将增加到可察觉的程度。可以使用EP工作点来控制打印机输出暗度，该EP工作点改变某些操作参数，例如激光二极管电流，驱动激光二极管的视频数据信号的占空比，以及包括充电辊电压的其它电压参数，或显影剂偏压。期望调整这些部件的使用寿命，以便在主要系统部件的整个使用寿命期间保持初始打印机输出暗度。调整可以基于包括以下参数中的一个或多个的度量的周期性间隔发生：所生成的像素数，打印页数，打印引擎的一个或多个组件的循环次数和/或消耗墨粉以克计。调整信息可以作为查询表提供，也可以以传递函数的形式提供。如果使用查找表，则调整控制算法可以是在存储在查找表中的周期性调整的使用值之间进行内插的算法。由于许多EP处理盒倾向于在该处理盒的使用寿命期内打印更暗而不是较轻，所以本发明将通过利用上述方法实现两个重要目标; 不仅打印机的输出暗度维持在基本恒定的值，而且通过使用存储在可更换的处理盒中的相同数量的调色剂，可以增加印刷的页数和打印页数的实际数量。

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