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    • 82. 发明公开
    • Method and apparatus for placing information on a medium while compensating for deviations from a characteristic time period
    • 用于从时间的标准时间段与所述偏差的补偿施加到信息的介质的方法和装置。
    • EP0257819A2
    • 1988-03-02
    • EP87306696.3
    • 1987-07-29
    • BIDCO INC.
    • Bidner, HarveyZuber, James
    • H04N1/04
    • G02B26/127G06K15/1219H04N1/053H04N1/1135H04N1/12H04N1/4015H04N2201/02439H04N2201/0471H04N2201/04732H04N2201/04744H04N2201/04774H04N2201/04775H04N2201/04777H04N2201/04794
    • A laser scanning apparatus is provided with a compensating arrangement whereby deviations of a synchronous drive are compensated for by adjusting the frequency with which the laser beam is modulated. The laser beam is directed onto a rotatable spinner (10) which causes the laser beam to scan a synchronized moving medium in a number of sequential and parallel lines, each of which is determined during a cycle of the movement of the spinner. The spinner is driven by a synchronous motor. During each cycle, a period error is measured to determine a compensating signal which is held for the next successive cycle and is used to control the frequency of a variable oscillator (62) which determines the clocking rate at which information is employed to modulate the laser beam. According to the method of the invention, lines of information are placed on a synchronized moving medium responsive to the aforesaid laser beam during successive cycles. The method involves modulating the laser beam in accordance with the information and at a frequency which is modified for each cycle in accordance with the deviation of the preceding cycle with respect to a characteristic normal time period.
    • 一种激光扫描装置设置有一补偿布置,由此一个同步驱动的偏差是为通过调整与该激光束被调制的频率补偿。 激光束被引导到一个可旋转的基座纺丝器(10),使激光束扫描同步的移动介质中的数的顺序和并行线,每条的所有这是确定性的离心器的运动的一个周期期间开采。 离心器是由同步电动机驱动。 在每个循环期间,周期误差进行测量,以确定矿补偿信号全部被保持用于下一连续的循环,并且用于控制可变振荡器的频率(62),确定性的地雷在哪个信息的时钟速率被用来调制激光 束。 。根据本发明的方法中,信息线被同步在连续循环过程置于移动介质响应于前述激光束。 该方法涉及在调制雅舞蹈的激光束与所述信息,并在所有的频率被修改为在雅舞蹈每个周期与preceding-周期的相对于偏差的特性正常时间周期。
    • 88. 发明公开
    • A method of replacing a laser
    • Verfahren zum Austauschen煽动激光。
    • EP0050425A2
    • 1982-04-28
    • EP81304423.7
    • 1981-09-24
    • XEROX CORPORATION
    • Norton, James R.
    • G02B26/10G03G15/32
    • H04N1/1135H04N1/024H04N1/053H04N1/12H04N2201/02402H04N2201/02439H04N2201/0471H04N2201/04732H04N2201/04744H04N2201/04777H04N2201/04794
    • A raster scanner (10) with laser (15) for generating a scanning beam (25) and compact, folded optical system for transmitting the beam to the object to be scanned. The optical system includes a modulator (27) for modulating the beam in accordance with video image signals and a rotatable polygon (35) for scanning the beam across the object to be scanned. The laser is supported at one end in a part-spherical bearing (58), permitting pivoting of the laser about a point (P) coincident with the optical axis (0) of the scanner, and at the other end by screw type adjustors (81) which are used to ad- justably displace the laser about the pivot point and so align the axis of the laser beam with the optical axis of the scanner. Scanner operating circuits are provided including a circuit enabling one or both of the scan detectors to serve as a light meter when aligning the laser.
    • 一种具有用于产生扫描光束(25)的激光(15)和用于将光束传送到待扫描对象的紧凑折叠光学系统的光栅扫描仪(10)。 光学系统包括用于根据视频图像信号调制光束的调制器(27)和用于扫描待扫描对象的光束的可旋转多边形(35)。 激光器在一端支撑在部分球形轴承(58)中,允许激光器围绕与扫描仪的光轴(0)重合的点(P)枢转,另一端由螺钉型调节器 81),其用于可调节地围绕枢轴点移动激光器,并且使激光束的轴线与扫描器的光轴对准。 提供了扫描器操作电路,其包括使得一个或两个扫描检测器在对准激光器时用作光度计的电路。
    • 89. 发明公开
    • Error compensation circuit for a bit clock
    • Fehlerkompensationsschaltungfüreinen Bit-Taktgenerator。
    • EP0043720A2
    • 1982-01-13
    • EP81303059.0
    • 1981-07-03
    • Xerox Corporation
    • Rider, Ronald E.
    • G03G15/32H04N1/02
    • H04N1/053H04N1/1135H04N2201/02439H04N2201/0471H04N2201/04732H04N2201/04744H04N2201/04775H04N2201/04777H04N2201/04793H04N2201/04794
    • Controlling the clock rate separately for each facet of a polygon used in a driven raster output scanner whereby the clock rate for facet zero is served using a first order integrator (11) driven by a digital correction circuit which compares the actual number of pulses against the required number, and produces therefrom an analog correction pulse width which is applied to the integrator (11). A second order integrator (19) is used to compensate for leakage of charge from the parallel capacitor of the first order integrator (11), to improve performance. The remaining facets are then corrected for by assigning to each individual correction voltage. This correction voltage is generated by counting clock pulses for each additional facet and using these pulse totals to generate individual analog correction voltages which are added to, or subtracted from, the facet zero voltage in an adder (18) which combines the facet zero correction voltage with each individual voltage in sequence.
    • 控制驱动光栅输出扫描器中使用的多边形的每个刻面的时钟速率,由此使用由数字校正电路驱动的第一阶积分器(11)来提供小平面零的时钟速率,该数字校正电路将实际脉冲数与 并产生施加到积分器(11)的模拟校正脉冲宽度。 二阶积分器(19)用于补偿来自一阶积分器(11)的并联电容器的电荷泄漏,以提高性能。 然后通过分配给每个单独的校正电压来校正其余的面。 该校正电压是通过对每个附加小面进行计数时钟脉冲而产生的,并且使用这些脉冲总数来生成加法器(18)中加上或减去的小零点电压的单独的模拟校正电压,该加法器(18)组合了小零点校正电压 每个单独的电压按顺序。