公开(公告)号：US06178031B1

公开(公告)日：2001-01-23

申请号：US09467568

申请日：1999-12-20

Applicant: Russell B. Rauch ,  Mohammad H. Rahnavard

Inventor： Russell B. Rauch ,  Mohammad H. Rahnavard

IPC: G02B2608

CPC classification number: G02B26/127 ,  H04N1/053 ,  H04N1/1135 ,  H04N1/12 ,  H04N2201/02443 ,  H04N2201/04768 ,  H04N2201/04793 ,  H04N2201/04798

Abstract: The pixel clock of a raster output scanning (ROS) system modulates an emitted light beam to provide pixel placement along a scan line. A method calculates the pixel clock frequency shifts to correct non-linearity of the scan line in a ROS. A data smoothing polynomial is calculated for the non-linearity of the pixels along the scan line. The needed frequency shift based on the polynomial to the first or higher orders is calculated and stored in a frequency shift look-up table. The calculated frequency shift from the frequency shift lookup table modifies the nominal pixel clock frequency to correct for the measured scan linearity of the ROS by modulation of the light beam.

Abstract translation: 光栅输出扫描（ROS）系统的像素时钟调制发射的光束，以沿扫描线提供像素放置。 一种方法计算像素时钟频移以校正ROS中扫描线的非线性。 针对沿着扫描线的像素的非线性计算数据平滑多项式。 基于多项式到第一或更高阶数的所需频移被计算并存储在频移查找表中。 从频移查找表计算出的频移修改了标称像素时钟频率，以通过调制光束来校正测量的ROS扫描线性度。

公开(公告)号：US3875587A

公开(公告)日：1975-04-01

申请号：US36180473

申请日：1973-05-18

Applicant: CROSFIELD ELECTRONICS LTD

Inventor： PUGSLEY PETER C

IPC: G03F3/08 ,  H04N1/053 ,  H04N1/06 ,  H04N1/203 ,  H04N1/207 ,  H04N1/50 ,  H04N1/22 ,  H04N1/46

CPC classification number: H04N1/0642 ,  H04N1/053 ,  H04N1/0657 ,  H04N1/0678 ,  H04N1/203 ,  H04N1/2036 ,  H04N1/207 ,  H04N1/508 ,  H04N2201/02416 ,  H04N2201/02439 ,  H04N2201/02443 ,  H04N2201/0404 ,  H04N2201/0471 ,  H04N2201/04724 ,  H04N2201/04732 ,  H04N2201/04734 ,  H04N2201/04755 ,  H04N2201/04768 ,  H04N2201/04786 ,  H04N2201/04789 ,  H04N2201/04791 ,  H04N2201/04794 ,  H04N2201/04798

Abstract: In a method and apparatus of image reproduction in which a light-sensitive surface is scanned by a light beam modulated by a reproducing head in accordance with a signal representing the densities of successive image elements to be reproduced, a component of the scanning motion is obtained by mounting the light-sensitive surface on the non-rotating surface of a cylinder and rotating a portion of the reproducing head within the cylinder so as to define a circular track on the output surface during one revolution of the rotatable portion of the reproducing head. A rotatable prism having a plurality of internal reflecting surfaces, such as a pentaprism, may reflect the light beam and may move axially within the cylinder to provide the other component of scanning motion. The pentaprism is advantageous during the presence of rotational vibration. Additionally, a plurality of light-sensitive surfaces may be placed sequentially on the surface of the cylinder to form respective color separations.

Abstract translation: 在通过根据表示要再现的连续图像元素的密度的信号通过由再现头调制的光束来扫描感光表面的图像再现的方法和装置中，获得扫描运动的分量 通过将感光表面安装在圆筒的非旋转表面上，并使圆筒内的再现头部的一部分旋转，以便在再现头的可旋转部分的一转期间在输出表面上限定圆形轨道。 具有多个内反射表面（例如五棱镜）的可旋转棱镜可以反射光束并且可以在圆柱体内轴向移动以提供扫描运动的另一分量。 五棱镜在旋转振动的存在期间是有利的。 此外，多个感光表面可以顺序地放置在圆柱体的表面上以形成相应的分色。