公开(公告)号：EP0947950B1

公开(公告)日：2005-07-20

申请号：EP98118586.1

申请日：1998-10-01

申请人： Hewlett-Packard Company, A Delaware Corporation

发明人： Hanson, Gary E. ,  Luque, Phillip R.

IPC分类号： G06K15/12 ,  H04N1/191

CPC分类号： B41J2/473 ,  G06K15/1261 ,  G06K2215/111 ,  H04N1/1912 ,  H04N1/1916 ,  H04N1/1918

公开(公告)号：EP0963016A3

公开(公告)日：2003-08-13

申请号：EP98119243.8

申请日：1998-10-12

申请人： Hewlett-Packard Company, A Delaware Corporation

发明人： Luque, Phillip R.

IPC分类号： H01S3/133

CPC分类号： H01S5/0683 ,  B41J2/471 ,  H01S5/0617

摘要： A first embodiment of an adjustment circuit (30) for a laser diode output power compensator includes a feedback circuit for adjusting the laser diode output power compensator so that the output power of the laser diode is substantially constant. The feedback circuit includes a photodiode (35) for measuring the output power of a VCSEL diode (20). The signal from the photodiode (35) is coupled to a first amplifier (39). The difference between the signal from the photodiode (35) and a first reference value is amplified and coupled through electronic switches (40, 42, 44) to selectively charge one of multiple capacitors (41, 43, 45). The multiple capacitors (41, 43, 45) are each coupled to one of a drive current source (32), a compensation current source (31), and a voltage controlled resistor (34), each of which are voltage controlled. A second amplifier (38) is used for amplifying the difference between the signal from the photodiode (35) and a second reference value to charge a capacitor (47) coupled to a voltage controlled bias current source (33). The first embodiment of the adjustment circuit (30) controls the bias current source (33), drive current source (32), compensation current source (31), and the voltage controlled resistor (34) so that the output power of the VCSEL diode is held substantially constant. A second embodiment of the adjustment circuit (30) uses an analog to digital converter (203), a digital comparator (204), a counter (205), and registers (206, 207, 208, 209) to form the feedback circuit for adjusting the laser diode output power compensator. A third embodiment of the adjustment circuit (30) uses an analog comparator (404), counters (410, 411, 412, 413), and registers (414, 415, 416, 417) to form the feedback circuit for adjusting the laser diode output power compensator.

摘要翻译： 用于激光二极管输出功率补偿器的调整电路（30）的第一实施例包括用于调整激光二极管输出功率补偿器的反馈电路，使得激光二极管的输出功率基本上恒定。 反馈电路包括用于测量VCSEL二极管（20）的输出功率的光电二极管（35）。 来自光电二极管（35）的信号耦合到第一放大器（39）。 来自光电二极管（35）的信号和第一参考值之间的差异被放大并通过电子开关（40,42,44）耦合，以选择性地对多个电容器（41,43,45）之一充电。 多个电容器（41,43,45）各自耦合到驱动电流源（32），补偿电流源（31）和压控电阻器（34）中的每一个，其中每一个被电压控制。 第二放大器（38）用于放大来自光电二极管（35）的信号与第二参考值之间的差异，以对耦合到电压控制偏置电流源（33）的电容器（47）充电。 调节电路（30）的第一实施例控制偏置电流源（33），驱动电流源（32），补偿电流源（31）和压控电阻器（34），使得VCSEL二极管 保持基本恒定。 调节电路（30）的第二实施例使用模数转换器（203），数字比较器（204），计数器（205）和寄存器（206,207,208,209）以形成反馈电路 调整激光二极管输出功率补偿器。 调整电路（30）的第三实施例使用模拟比较器（404），计数器（410,411,412,413）和寄存器（414,415,416,417）来形成用于调整激光二极管的反馈电路 输出功率补偿器。

公开(公告)号：EP0947950A3

公开(公告)日：2002-11-20

申请号：EP98118586.1

申请日：1998-10-01

申请人： Hewlett-Packard Company, A Delaware Corporation

发明人： Hanson, Gary E. ,  Luque, Phillip R.

IPC分类号： G06K15/12 ,  H04N1/191

CPC分类号： B41J2/473 ,  G06K15/1261 ,  G06K2215/111 ,  H04N1/1912 ,  H04N1/1916 ,  H04N1/1918

摘要： A laser printer (10) produces an image of raster scan lines exhibiting a pitch distance p. The printer (10) includes a photoreceptor (36) and n laser sources (51), where n ≥ 2. First and second sets of laser sources (51), in one embodiment, produce plural optical beams (34,34') which, when imaged on the photoreceptor (36), are separated by pitch distance p in the direction of movement of the photoreceptor (36). The first set and second sets of laser sources (51) are separated by a distance SPR=c(1+qr)p, where: c = number of laser sources (51) in each set, q = an integer, and r = number of rows of laser sources (51) in both the first and second sets. The optical beams (34,34') are modulated with pixel value data in accordance with a correspondence of image scan lines and positions of the optical beams (34,34') on the photoreceptor (36). The photoreceptor (36) is moved by a distance (q·c·r)p between scans. In such manner, an interleaving of the scan lines is achieved, which allows substantial separation of laser diodes (51) on a laser diode chip (50).