公开(公告)号：US20020051137A1

公开(公告)日：2002-05-02

申请号：US09873256

申请日：2001-06-05

Applicant: RICOH COMPANY, LTD.

Inventor： Hidetoshi Ema ,  Akihisa Itabashi

IPC: B41B001/00

CPC classification number: H04N1/053 ,  G06K15/1219 ,  H04N1/1135 ,  H04N1/12 ,  H04N2201/02439 ,  H04N2201/0471 ,  H04N2201/04732 ,  H04N2201/04744 ,  H04N2201/04772 ,  H04N2201/04781 ,  H04N2201/04794

Abstract: In an image forming apparatus which uses a semiconductor laser as a light source, a semiconductor laser is controlled by adjustment of an image write-in clock, and a highly accurate scanning position alignment is performed with a simple structure. An optical unit scans a rotational photo conductor by a laser light output by a semiconductor laser. A photodetector detects the laser light output by the semiconductor laser at a predetermined position. An electrostatic latent image is formed by scanning the rotational photo conductor based on the laser light detected by the photodetector. By dividing a clock output from a high-frequency clock generation circuit, an image clock which synchronized with the output of the photodetector is generated, and the phase of the image clock is changed.

Abstract translation: 在使用半导体激光器作为光源的图像形成装置中，通过调整图像写入时钟来控制半导体激光器，并且以简单的结构执行高精度的扫描位置对准。 光学单元通过半导体激光器输出的激光扫描旋转光导体。 光检测器检测半导体激光器在预定位置输出的激光。 通过基于由光电检测器检测的激光扫描旋转光导体来形成静电潜像。 通过分频来自高频时钟产生电路的时钟输出，产生与光电检测器的输出同步的图像时钟，并且改变图像时钟的相位。

公开(公告)号：US20020158965A1

公开(公告)日：2002-10-31

申请号：US09797574

申请日：2001-03-05

Applicant: RICOH COMPANY, LTD

Inventor： Hidetoshi Ema

IPC: B41J002/435

CPC classification number: H04N1/40043 ,  H04N1/053 ,  H04N1/40037 ,  H04N2201/0471 ,  H04N2201/04732 ,  H04N2201/04744 ,  H04N2201/04767

Abstract: An image forming apparatus includes a semiconductor laser that irradiates a laser beam modulated based on an image modulation signal, a scanning device that scans an image carrier with the semiconductor laser beam, and a pixel clock generating device that generates a pixel clock that controls the laser beam. The pixel clock includes a plurality of pulses having a prescribed normal width constituted by a prescribed number of fractions (N), and substantially periodically includes one or more pulses having a greater width constituted by a number of fractions of (N) plus (M).

Abstract translation: 图像形成装置包括照射基于图像调制信号调制的激光束的半导体激光器，利用半导体激光束扫描图像载体的扫描装置，以及生成控制激光的像素时钟的像素时钟生成装置 光束。 像素时钟包括具有由规定数量的分数（N）构成的规定的正常宽度的多个脉冲，并且基本上周期性地包括具有由（N）加（M）的多个分数构成的较大宽度的一个或多个脉冲， 。