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1.发明授权Method and apparatus to correct for active write length and bow changes in LED print bars 失效校正LED打印条中主动写入长度和弓形变化的方法和装置
公开(公告)号：US5973718A
公开(公告)日：1999-10-26
申请号：US981919
申请日：1992-11-23
IPC分类号： B41J2/525 , B41J2/44 , B41J2/45 , B41J2/455 , B41J3/54 , G02B26/10 , G03G15/01 , H04N1/04 , B41J2/46 , G02B3/00 , G02B6/06
CPC分类号： B41J2/451
摘要： An image bar printing system, which, in a preferred embodiment, utilizes a plurality of LED arrays to provide a plurality of color images. The print bars are used in conjunction with a plurality of gradient index lens arrays which optically couple and focus the LED outputs onto a photosensitive surface. In order to maintain image-to-image registration, out of spec deviations in active write length of the image bar and scan line bow are identified and compensated for by selective deformation of one or more lens arrays in a specified manner. The lens deformation serves to reorient the position of certain of the lens elements, redirecting the transmitted LED outputs so as to shorten or lengthen the active write length, or to eliminate bow in the scan line.
摘要翻译： 一种图像条打印系统，其在优选实施例中利用多个LED阵列来提供多个彩色图像。 印刷条与多个梯度折射率透镜阵列结合使用，其将LED输出光学耦合并聚焦到光敏表面上。 为了保持图像到图像配准，通过以特定方式的一个或多个透镜阵列的选择性变形来识别和补偿图像条和扫描线弓的有效写入长度中的特定偏差之外的差异。 透镜变形用于重新定向某些透镜元件的位置，重定向透射的LED输出以缩短或延长有效写入长度，或者消除扫描线中的弓。
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2.发明授权
公开(公告)号：US5659414A
公开(公告)日：1997-08-19
申请号：US492504
申请日：1995-06-20
申请人： James J. Appel , Aron Nacman , Robert H. Melino
发明人： James J. Appel , Aron Nacman , Robert H. Melino
IPC分类号： B41J2/44 , G02B26/10 , G02B26/12 , G03B27/72 , G03G15/04 , G03G15/043 , H01S5/026 , H01S5/06 , G02B26/08
CPC分类号： G02B26/127 , G02B26/123
摘要： The present invention provides a means and method for efficiently and automatically monitoring and adjusting the power output of either a single or a dual beam laser diode array used to provide the scanning beams in a ROS system. Collimated light outputs from a collimator lens assembly following either a single or dual beam laser are reflected along an optical path to impinge on one or two photodiodes positioned so as to intercept the reflected light. The photodiode output is proportional to the power output of the laser diode associated with the photodiode. In one multi-beam embodiment, polarization of the laser diode output is controlled so as to ensure that only outputs from an associated laser diode is sensed by an associated photodiode. In another embodiment, a half wave plate is used to rotate the polarization of one of the laser diodes.
摘要翻译： 本发明提供了一种用于有效和自动地监视和调整用于在ROS系统中提供扫描光束的单光束或双光束激光二极管阵列的功率输出的方法和方法。 来自准直透镜组件的准直光输出随着单光束或双光束激光器被沿着光路反射以照射到一个或两个光电二极管上，以便截取反射光。 光电二极管输出与与光电二极管相关的激光二极管的功率输出成正比。 在一个多光束实施例中，控制激光二极管输出的极化，以便确保来自相关激光二极管的输出仅由相关的光电二极管感测。 在另一个实施例中，使用半波片来旋转激光二极管之一的偏振。
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公开(公告)号：US5751333A
公开(公告)日：1998-05-12
申请号：US558618
申请日：1995-11-14
申请人： Robert H. Melino
发明人： Robert H. Melino
IPC分类号： B41J2/44 , B41J2/47 , G02B26/12 , G03G15/04 , G03G15/043 , G06K15/12 , H04N1/113 , G01D15/14 , H01S3/00 , B41J4/435
CPC分类号： B41J2/471 , G02B26/127 , G06K15/1204
摘要： The present invention discloses a dynamic control of a drive circuit to a diode laser used in a raster output scanning system. In the prior art, the binary serial stream input to a diode laser operates on the laser to pulse the laser on when a "one" input is applied, the laser staying on when the first one input is immediately followed by successive one inputs. The first on pixel creates an exposure at an image plane which is less than uniform due to the characteristics of the drive circuit due to the overshoot or undershoot characteristics of the drive circuit. The second and succeeding pixels following the first pixel turned on will be at a maximum exposure value and hence will have an undesirable exposure contrast with the first pixel. The present invention adds delay circuitry to the drive circuits of the diode laser to introduce a gating signal which delays the application of the pixel stream to the laser diode in such a way that each successive on pulse is cycled on and off therefore each exposure value of each on pixel is exactly the same. Additional circuitry is included to compensate for the loss of exposure by increasing the laser diode output.
摘要翻译： 本发明公开了光栅输出扫描系统中使用的二极管激光器的驱动电路的动态控制。 在现有技术中，输入到二极管激光器的二进制串行数据流在激光器上工作，当施加“一个”输入时，激光器接通脉冲，当第一个输入紧随其后的是连续的一个输入时，激光器保持接通。 第一个像素由于驱动电路的过冲或下冲特性而由于驱动电路的特性而在图像平面上产生小于均匀的曝光。 第一个像素之后的第二个和后续像素接通将处于最大曝光值，因此与第一像素具有不希望的曝光对比度。 本发明将延迟电路添加到二极管激光器的驱动电路，以引入门控信号，该门控信号将像素流的应用延迟到激光二极管，使得每个连续的导通脉冲循环开启和关闭，因此每个曝光值 每个像素都完全相同。 包括额外的电路，通过增加激光二极管输出来补偿曝光损失。
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4.发明授权Raster output scanner exposure control for bias and run levels in a multiple diode system 失效光栅输出扫描仪曝光控制用于多重二极管系统中的偏置和运行电平
公开(公告)号：US6137522A
公开(公告)日：2000-10-24
申请号：US4095
申请日：1998-01-07
申请人： Robert H. Melino , Martin E. Hoover
发明人： Robert H. Melino , Martin E. Hoover
CPC分类号： H04N1/4005 , B41J2/473 , H04N1/40037
摘要： The present invention is a method and apparatus for digitally controlling the output of multiple laser diodes in a system that forms a plurality of scan lines in a Raster Output Scanning (ROS) system. Output of the laser diodes is digitally controlled by monitoring and controlling the bias and run level power for each of the laser diodes. The system employs predetermined, controllable biasing currents to increase the resolution of the exposure current and thereby accurately control the output power of each of the multiple laser diodes, and to provide a fixed exposure level that is detectable by a low-cost start-of-scan detector.
摘要翻译： 本发明是一种在栅格输出扫描（ROS）系统中形成多条扫描线的系统中数字控制多个激光二极管的输出的方法和装置。 激光二极管的输出通过监视和控制每个激光二极管的偏置和运行电平来进行数字控制。 该系统采用预定的可控偏置电流来增加曝光电流的分辨率，从而精确地控制多个激光二极管中的每一个的输出功率，并提供固定的曝光水平， 扫描检测器。
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公开(公告)号：US5321438A
公开(公告)日：1994-06-14
申请号：US13866
申请日：1993-02-05
申请人： Robert H. Melino
发明人： Robert H. Melino
CPC分类号： H04N1/506 , Y10S347/90
摘要： A print bar color printing system wherein exposure occurs through previously deposited color toner is compensated for light absorption in the previously deposited toner by selectively increasing the output of the print bar during a pixel time interval. Each time interval is divided into sublines which are available for applying image data. One subline transmits image data corresponding to the color of the image to be exposed at the photoreceptor surface, while the second subline carries information as to previously exposed and developed color images which overlap the subsequent image. The print bar is then selectively addressed to form the main color image with a pulse of relatively long duration, or duty cycle, followed by a pulse having a relatively short duty cycle. The second or third pulses represent the additional exposure level needed to compensate for light absorbed by previous color toners formed on the belt during the earlier development process.
摘要翻译： 通过在像素时间间隔期间选择性地增加打印条的输出，通过先前沉积的彩色调色剂进行曝光的印刷条彩色打印系统补偿了先前沉积的调色剂中的光吸收。 每个时间间隔被划分为可用于应用图像数据的子线。 一个子线传送与要在感光体表面曝光的图像的颜色相对应的图像数据，而第二子线承载关于与后续图像重叠的先前曝光和显影的彩色图像的信息。 然后选择性地寻址打印条以形成具有较长持续时间或占空比的脉冲的主彩色图像，随后是具有较短占空比的脉冲。 第二或第三脉冲表示在较早的显影过程中补偿由先前在色带上形成的彩色调色剂吸收的光所需的附加曝光水平。
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公开(公告)号：US5165074A
公开(公告)日：1992-11-17
申请号：US569681
申请日：1990-08-20
申请人： Robert H. Melino
发明人： Robert H. Melino
CPC分类号： H04N1/4078
摘要： Output copy quality in a ROS electrophotographic printer is maintained by a method and apparatus designed to selectively vary the beam intensity level of a laser beam scan in response to changed conditions within the scanning or xerographic output subsystems. A test pattern video data input is periodically applied to a laser creating an exposure of the test pattern at the photoreceptor. The resulting print has a plurality of horizontal bands with each band associated with a specific beam intensity correction signal. The test pattern band which appears to provide optimum density is identified. The corresponding digital beam intensity correction signal in the ESS memory is enabled and replaces the previous beam intensity signal controlling the laseer output level.
摘要翻译： ROS电子照相打印机中的输出复印质量由设计成响应于扫描或静电印刷输出子系统内的变化的条件选择性地改变激光束扫描的光束强度水平的方法和装置来维持。 测试图案视频数据输入周期地应用于在感光体上产生测试图案的曝光的激光。 所得到的打印具有多个水平带，每个带与特定光束强度校正信号相关联。 鉴定出似乎提供最佳密度的测试图案带。 ESS存储器中相应的数字光束强度校正信号被使能，并替代控制输出级输出电平的先前光束强度信号。
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