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1. 发明授权

US06362847B1 Electronic control arrangement for a laser printer 有权
公开(公告)号：US06362847B1
公开(公告)日：2002-03-26
申请号：US09333344
申请日：1999-06-15
申请人： Daniel Eugene Pawley , David Anthony Schneider , Thomas Campbell Wade , Earl Dawson Ward, II
发明人： Daniel Eugene Pawley , David Anthony Schneider , Thomas Campbell Wade , Earl Dawson Ward, II
IPC分类号： B41J247
CPC分类号： H04N1/053 , H04N1/1135 , H04N1/12 , H04N2201/0471 , H04N2201/04732 , H04N2201/04748 , H04N2201/04768
摘要： The write lines of a color laser printer are maintained substantially equal throughout the printer's operation by an electronic control arrangement. At the factory, the write lines on all photoconductors of the color laser printer are calibrated to be substantially equal, and the ratio of each write line to a measuring line for each photoconductor is ascertained. During operation of the printer, the length of each of the measuring lines is periodically determined through counting the number of PELslice clock timing pulses produced from a PELslice clock operating at a fixed frequency determined during factory calibration. The length of the write line is determined by the product of the length of the measuring line and the factory calibrated ratio of the length of the write line to the length of the measuring line. After each periodic determination, PELslice clock timing pulses are selectively inserted into or removed from the PELslice clock timing pulses for all of the write lines but the write line, which is closest to the desired length, to increase or decrease their lengths to be substantially equal to the write line, which is closest to the desired length. The time for insertion or removal of each of the PEL slices into the train of PELslice clock timing pulses produced by the PELslice clock is determined with each preferably inserted at a non-active portion of a PEL. Each insertion or removal of a PEL slice also may be offset from its determined position.

2. 发明授权

US06650352B2 Electronic control arrangement for a laser printer 有权
公开(公告)号：US06650352B2
公开(公告)日：2003-11-18
申请号：US10011182
申请日：2001-11-13
申请人： Daniel Eugene Pawley , David Anthony Schneider , Thomas Campbell Wade , Earl Dawson Ward, II
发明人： Daniel Eugene Pawley , David Anthony Schneider , Thomas Campbell Wade , Earl Dawson Ward, II
IPC分类号： B41J2435
CPC分类号： H04N1/053 , H04N1/1135 , H04N1/12 , H04N2201/0471 , H04N2201/04732 , H04N2201/04748 , H04N2201/04768
摘要： The write lines of a color laser printer are maintained substantially equal throughout the printer's operation by an electronic control arrangement. At the factory, the write lines on all photoconductors of the color laser printer are calibrated to be substantially equal, and the ratio of each write line to a measuring line for each photoconductor is ascertained. During operation of the printer, the length of each of the measuring lines is periodically determined through counting the number of PELslice clock timing pulses produced from a PELslice clock operating at a fixed frequency determined during factory calibration. The length of the write line is determined by the product of the length of the measuring line and the factory calibrated ratio of the length of the write line to the length of the measuring line. After each periodic determination, PELslice clock timing pulses are selectively inserted into or removed from the PELslice clock timing pulses for all of the write lines but the write line, which is closest to the desired length, to increase or decrease their lengths to be substantially equal to the write line, which is closest to the desired length. The time for insertion or removal of each of the PEL slices into the train of PELslice clock timing pulses produced by the PELslice clock is determined with each preferably inserted at a non-active portion of a PEL. Each insertion or removal of a PEL slice also may be offset from its determined position.

3. 发明授权

US6091891A Method and apparatus for calibrating delay lines to create gray levels in continuous tone printing 失效
公开(公告)号：US6091891A
公开(公告)日：2000-07-18
申请号：US853687
申请日：1997-05-09
申请人： Gary Scott Overall , Thomas Campbell Wade
发明人： Gary Scott Overall , Thomas Campbell Wade
IPC分类号： B41J2/52 , B41J2/44 , H04N1/387 , H04N1/40 , H04N1/405
CPC分类号： H04N1/40
摘要： An improved printer is provided which includes a series of analog delay elements that operate at a very fast speed, and therefore, can be used in an enhanced mode to further subdivide the slice clock to create a greater variety of gray levels that can be used in continuous tone printing. By using this enhanced mode of continuous tone printing, a full "on" slice can be immediately preceded or followed by a partial slice, under the control of the series of delay elements. The delay elements are automatically calibrated at the beginning of each page to be printed by placing the delay line chain circuit into a "calibrate mode," during which time a clock pulse is provided to the delay line chain so that the chain is repeatedly tested, in increments of one additional delay element at a time, to determine the number of delay elements that are required to cause a time delay that is greater than or equal to the period of the slice-based clock. Once that quantity is determined, the calibrated delay elements will be used to print the entire next page to be output from the laser printhead. As the printer desires various gray levels for continuous tone printing, the number of whole slices and partial slices for a particular pel or group of pels will be determined by the desired gray level, and when a partial slice is to be printed, the printer will select the appropriate number of delay elements that will be used to control a flip-flop that outputs the "video output" signal to the laser printhead. When the asynchronous "reset" input of the flip-flop has a control signal applied, the output of the flip-flop will immediately change state to truncate the "on time" of the slice that was currently being output to the laser printhead. By use of the asynchronous reset flip-flop, the slice can be subdivided into smaller time intervals, completely under the control of the delay line chain without regard to the frequency or phase angle of the pel clock or the slice-based clock.

4. 发明授权

US06822672B1 Printhead and fuser standby management 有权
标题翻译：打印头和定影器待机管理
公开(公告)号：US06822672B1
公开(公告)日：2004-11-23
申请号：US10602151
申请日：2003-06-24
申请人： Douglas Anthony Able , Cyrus Bradford Clarke , David John Mickan , Kevin Dean Schoedinger , Thomas Campbell Wade
发明人： Douglas Anthony Able , Cyrus Bradford Clarke , David John Mickan , Kevin Dean Schoedinger , Thomas Campbell Wade
IPC分类号： B41J2700
CPC分类号： G02B26/122
摘要： A laser printer having a rotating mirror (116) and a heat fuser (220) is operated with a sequence of standby conditions. At the end of a print job mirror (116) is continued to be rotated at printing speed while the temperature of fuser (220) is reduced somewhat. This is maintained for a short time, after which the speed of rotation of mirror (116) is reduced significantly and the fuser (220) temperature is reduced significantly. This is maintained for a time, after which the mirror is no longer rotated (or, if practical, is rotated very slowly) and the fuser temperature is further reduced. At any time when a subsequent print job is received, the mirror and fuser are brought to printing state and the period of times are next started from a beginning state.
摘要翻译：具有旋转镜（116）和热定影器（220）的激光打印机以待机状态的顺序操作。在打印作业镜（116）的末端继续以打印速度旋转，而定影器（220）的温度稍微降低。这保持了很短的时间，之后反射镜（116）的旋转速度显着降低，并且定影器（220）温度显着降低。保持一段时间，之后镜子不再旋转（或者如果实际，旋转非常缓慢）并且定影器温度进一步降低。在接收到随后的打印作业的任何时候，使镜子和定影器进入打印状态，并且从开始状态开始下一个时间段。

5. 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。

6. 发明授权

US5982408A Method and apparatus for HSYNC synchronization 失效
标题翻译：用于HSYNC同步的方法和装置
公开(公告)号：US5982408A
公开(公告)日：1999-11-09
申请号：US838581
申请日：1997-04-10
申请人： Gary Scott Overall , Thomas Campbell Wade
发明人： Gary Scott Overall , Thomas Campbell Wade
IPC分类号： B41J29/38 , G06F3/12 , G06K15/12 , H04N1/047 , H04N7/62
CPC分类号： H04N1/047 , G06K15/1219 , H04N2201/04729 , H04N2201/04791
摘要： A method of achieving line-to-line synchronization having a high degree of synchronization accuracy. Synchronization is performed by a specific high-speed block of logic which signals the beginning of scans to a PELCLK-based logic at pel boundaries, and provides sub-pel shifting as it passes data between the pel generation logic and a laser control signal. The synchronization error is made as small as propagation delays through a single multiplexer element. Such delays can be controlled to values less than 1/2 ns. The need to stop and restart the clocks is eliminated. All complex pel generation logic is clocked with the relatively low frequency PELCLK without regard to the synchronization task.
摘要翻译：实现具有高同步精度的线间同步的方法。通过特定的高速逻辑块来执行同步，该高速逻辑块在像素边界处将基于PELCLK的逻辑信号开始扫描，并且当它通过像素生成逻辑和激光控制信号之间的数据时提供子像素移位。通过单个多路复用器元件使同步误差小到传播延迟。这样的延迟可以被控制到小于+ E，1/2 + EE ns的值。消除了停止和重启时钟的需要。所有复杂的像素生成逻辑以相对较低频率的PELCLK计时，而不考虑同步任务。

7. 发明授权

US06902161B2 Sheet feeder avoiding sheet sag 有权
标题翻译：送纸器避免纸张下垂
公开(公告)号：US06902161B2
公开(公告)日：2005-06-07
申请号：US10405985
申请日：2003-04-02
申请人： Michael Kurt Gordon , Thomas Campbell Wade
发明人： Michael Kurt Gordon , Thomas Campbell Wade
IPC分类号： B65H5/38 , B65H1/00
CPC分类号： B65H5/38 , B65H2301/51214 , B65H2404/742 , B65H2407/21 , B65H2511/12 , B65H2220/01 , B65H2220/04
摘要： An entrance guide for externally fed sheet (4) to printer (1) is configured to bow the sheets. In one embodiment guides (5a, 5aa) within slot 7 have upper and lower configurations which force sheet into a bow. In one embodiment slot (7a) is bowed and is sufficiently narrow in height to only accept a bowed sheet. The bowed sheets do not sag against the printer (1), which aids in sheet registration.
摘要翻译：用于外部供给的纸张（4）到打印机（1）的入口引导件被构造成使纸张弯曲。在一个实施例中，槽7内的引导件（5a，5a）具有将片材压制成弓形的上部和下部构型。在一个实施例中，槽（7a）是弯曲的并且在高度上足够窄以仅接受弓形片。弯曲的纸张不会打印到打印机（1）上，这有助于纸张注册。

8. 发明授权

US06512597B1 Method and apparatus for correcting unadjusted threshold arrays for halftoning by use of parameterized transfer functions that generate adjusted threshold arrays at run time 有权
标题翻译：用于通过使用在运行时产生调整的阈值阵列的参数化传递函数来校正未校正阈值数组以进行半色调的方法和装置
公开(公告)号：US06512597B1
公开(公告)日：2003-01-28
申请号：US09442211
申请日：1999-11-17
申请人： Brian Edward Cooper , Brian Wesley Damon , Paul Athanasius Robinson , Thomas Campbell Wade
发明人： Brian Edward Cooper , Brian Wesley Damon , Paul Athanasius Robinson , Thomas Campbell Wade
IPC分类号： G06F1300
CPC分类号： H04N1/4051
摘要： A printer that stores a minimal number of unadjusted stochastic threshold arrays in non-volatile memory, in which the unadjusted threshold arrays are used to generate adjusted threshold arrays at run time by use of special parameterized transfer functions. The unadjusted array for a particular color is stored in the printer's ROM and preferably is stored in a packed configuration to save memory space. The parameterized transfer functions are used to convert the unadjusted threshold data into adjusted threshold data for each color and type of print media. These parameterized transfer functions are stored in the printer's non-volatile memory, and take up very little memory space. In a preferred embodiment, the unadjusted threshold array comprises a 128 row by 128 column sized array, and each element of this array comprises a 10-bit number. When a parameterized transfer function is applied to this unadjusted array, the resulting numeric values for the adjusted array elements are produced as 8-bit numeric values. The greater precision in the originating unadjusted array provides more perceptual levels of intensity (i.e., color brightness), which is particularly important at the lighter shades of each color. The adjusted threshold arrays add only the number of dots per gray level (i.e., per differential threshold array level) that are required to provide a printer response that very nearly approximates the human eye perceptual differential response of intensity.
摘要翻译：一种在非易失性存储器中存储少量未经调整的随机阈值阵列的打印机，其中未调整的阈值阵列用于通过使用特殊的参数化传递函数在运行时生成调整的阈值阵列。用于特定颜色的未经调整的阵列存储在打印机的ROM中，并且优选地存储在打包配置中以节省存储空间。参数化传输函数用于将未调整的阈值数据转换为每种颜色和类型的打印介质的调整阈值数据。这些参数化传输功能存储在打印机的非易失性存储器中，并占用很少的内存空间。在优选实施例中，未调整的阈值阵列包括128行×128列大小的阵列，并且该阵列的每个元素包括10位数。当参数化传递函数应用于此未调整数组时，调整后的数组元素的结果数值将生成为8位数值。原始未调整阵列中的更高精度提供了更多的感知强度水平（即，颜色亮度），这在每种颜色的较浅色调下特别重要。经调整的阈值阵列仅增加提供非常接近人眼感知强度差异响应的打印机响应所需的每灰度级（即，每差分阈值阵列级）的点数。

9. 发明授权

US5995774A Method and apparatus for storing data in a non-volatile memory circuit mounted on a printer's process cartridge 有权
公开(公告)号：US5995774A
公开(公告)日：1999-11-30
申请号：US152241
申请日：1998-09-11
申请人： Steven Lewis Applegate , Cyrus Bradford Clarke , Timothy Philip Craig , David Lee Merrifield , James John Molloy , Benjamin Keith Newman , Gary Scott Overall , Gregrory Lawrence Ream , Thomas Gregrory Survant , Thomas Campbell Wade , Phillip Byron Wright
发明人： Steven Lewis Applegate , Cyrus Bradford Clarke , Timothy Philip Craig , David Lee Merrifield , James John Molloy , Benjamin Keith Newman , Gary Scott Overall , Gregrory Lawrence Ream , Thomas Gregrory Survant , Thomas Campbell Wade , Phillip Byron Wright
IPC分类号： G03G21/18 , G03G15/08
CPC分类号： G03G21/1889 , G03G2221/1663
摘要： An improved electrophotographic (EP) printer is provided having a detachable process cartridge that contains a non-volatile memory device, which is an EPROM that cannot be erased after a bit is burned. A "toner wheel" mounted to the exterior of the toner reservoir of the process cartridge provides, in conjunction with an optoelectronic sensor, an electrical signal that the printer receives and uses to determine toner usage. A toner "gas-gauge" is created which uses "bucket levels" as discrete steps to indicate how much of the measured physical toner material actually remains within the toner reservoir. After a given amount of toner material has been dispensed through the developer unit, one of the bits of the EPROM memory device is irreversibly burned, thereby providing a permanent record on the process cartridge of a certain amount of toner usage. As with a normal automobile gas gauge, the toner gas-gauge reading should never increase unless the amount of toner material inside the toner reservoir has increased. Once the bucket level transitions begin to occur for the toner gas-gauge, the printer becomes aware that a majority of the toner material has been expended from inside the toner reservoir. If the number of bucket gradation levels then increases by more than the hysteresis amount, then the printer will "lock out" the operation of a non-reusable process cartridge. When the lock-out mode occurs, a particular bit is burned on the EPROM mounted to the cleaner housing of the process cartridge. This ensures that this particular process cartridge cannot be removed, then simply placed back into the same (or a different) printer, and then begin supplying toner to a printer. Certain important "machine data" also can be stored in the EPROM memory device on the process cartridge of the present invention. The present invention is also able to declare the "end-of-life" of a process cartridge when the gas-gauge toner sensor is not functional (such as when it has been tampered with).

10. 发明授权

US5867203A EMI reduction in output devices 失效
标题翻译：输出设备的EMI降低
公开(公告)号：US5867203A
公开(公告)日：1999-02-02
申请号：US857228
申请日：1997-05-16
申请人： Christopher Dane Jones , Gary Scott Overall , Thomas Campbell Wade , Phillip Byron Wright
发明人： Christopher Dane Jones , Gary Scott Overall , Thomas Campbell Wade , Phillip Byron Wright
IPC分类号： B41J2/44 , G06K15/12 , H05K9/00 , G11B20/18
CPC分类号： G06K15/128 , G06K2215/0071
摘要： A method of reducing EMI when printing an image with a printer having a laser includes determining edge pels located near an edge of the image, determining interior pels located within the image and not edge pels, forming edge pels by operating the laser at a first duty cycle and forming at least a portion of a plurality of interior pels by operating the laser at a second duty cycle longer than the first duty cycle. Another aspect is a method of reducing EMI in a printer when forming a latent image on a photoconductive member by gating a light source ON and OFF, including the steps of identifying a first region near an edge of an image to be formed, the first region being formed by gating the light source at a first frequency; and identifying an interior region of the image to be formed, the interior region being formed by gating the light source at a second frequency lower than the first frequency.
摘要翻译：使用具有激光打印机的图像打印时降低EMI的方法包括确定位于图像边缘附近的边缘像素，确定位于图像内部的内部像素，而不是边缘像素，通过以第一职责操作激光来形成边缘像素循环并且通过以比第一占空比更长的第二占空比操作激光器来形成多个内部像素的至少一部分。另一方面是一种通过选择光源ON和OFF来形成感光体上的潜像来减少打印机中的EMI的方法，包括以下步骤：识别要形成的图像的边缘附近的第一区域，第一区域通过以第一频率门控光源形成; 以及识别要形成的图像的内部区域，所述内部区域通过以低于所述第一频率的第二频率选通所述光源而形成。

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