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    • 5. 发明授权
    • Image scanning and writing apparatus which uses different synchronizing
signals for scanning and writing
    • 图像扫描和写入装置,其使用不同的同步信号进行扫描和写入
    • US5790164A
    • 1998-08-04
    • US535463
    • 1995-09-28
    • Yasushi Kamo
    • Yasushi Kamo
    • B41J29/38B41J2/385G06T1/60H04N1/00H04N1/053H04N1/113H04N1/12
    • H04N1/053H04N1/1135H04N1/12H04N2201/0471H04N2201/04767
    • A method and apparatus which writes image information into a memory and reads the image information out of the memory using different synchronizing signals. A first synchronizing signal which is used to write scanned image data into the memory is generated to have a predetermined regularity, for example using a clock signal. The second synchronizing signal is based on an output of a photosensor which detects laser light reflecting off a polygonal mirror and is based on the rotating speed of the motor. The image information in the memory is read out in synchronism with the writing of the image information by the laser beam and polygonal mirror onto the photoconductive element using the second synchronizing signal. Therefore, it is not necessary for the polygonal mirror and the motor driving the polygonal mirror to be at a predetermined stable speed during the scanning operation.
    • 将图像信息写入存储器并使用不同的同步信号从存储器读出图像信息的方法和装置。 生成用于将扫描图像数据写入存储器的第一同步信号,例如使用时钟信号,具有预定的规律性。 第二同步信号基于检测从多面镜反射的激光的光传感器的输出,并且基于电动机的转速。 与使用第二同步信号的激光束和多面镜将图像信息写入光电元件的同步读出存储器中的图像信息。 因此,在扫描操作期间,多角镜和驱动多角镜的电动机不必处于预定的稳定速度。