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    • 2. 发明授权
    • Laser printer capable of changing a pixel density
    • 能够改变像素密度的激光打印机
    • US4872025A
    • 1989-10-03
    • US174120
    • 1988-03-28
    • Makoto SekiyaKanji Wada
    • Makoto SekiyaKanji Wada
    • G06K15/12H04N1/40
    • H04N1/4005G06K15/12H04N1/40037
    • When a data control portion receives a request for change of a pixel density, a cycle used as a reference cycle for detecting abnormality in a laser beam is changed corresponding to the pixel density. While a rotating speed of a polygon mirror for changing the density of picture element is not constant, emission of the laser beam is forbidden and detection as to abnormality in the laser beam is not effected. A mark for detection of an image density is formed on a photoreceptor where the laser beam is scanned, and outside an area where the image is to be formed. The formation of the detection mark is forbidden while the pixel density is being changed. On the other hand, when the detection mark is being formed, output of an instruction for changing the pixel density is deferred. In addition, emission of the laser beam is forbidden while the pixel density is being changed.
    • 当数据控制部分接收到像素密度变化的请求时,根据像素密度改变用作检测激光束异常的参考周期的循环。 虽然用于改变像素的密度的多面镜的旋转速度不是恒定的,但是禁止发射激光束,并且不会对激光束中的异常进行检测。 用于检测图像浓度的标记形成在激光束被扫描的感光体上,并且在要形成图像的区域外部。 当像素密度改变时,禁止形成检测标记。 另一方面,当正在形成检测标记时,延迟了用于改变像素密度的指令的输出。 此外,在改变像素密度的同时禁止发射激光束。
    • 6. 发明授权
    • Image recording apparatus with improved SOS detection
    • 具有改进的SOS检测的图像记录装置
    • US4888647A
    • 1989-12-19
    • US323276
    • 1989-03-14
    • Kanji Wada
    • Kanji Wada
    • G06K15/12H04N1/053H04N1/113H04N1/12
    • G06K15/1219G06K15/1214H04N1/053H04N1/1135H04N1/12H04N2201/0471
    • An image recording apparatus comprises a laser light source for generating a primary beam for scanning and a secondary beam for monitoring the light amount thereof which has a photodiode for detecting the light amount of the secondary beam. The output signal of the photodiode obtained when only the secondary beam is incident on the photodiode is distinguished from the output signal of the photodiode obtained when the secondary beam and the primary beam having been reflected from a deflecting surface are incident at the same time on the photodiode in order to output a start of scan signal for every one scan line at a moment when the primary beam and the secondary beam are incident at the same time on the photodiode.
    • 图像记录装置包括用于产生用于扫描的主光束的激光光源和用于监视其光量的次光束,该光束具有用于检测次光束的光量的光电二极管。 当只有次级光束入射到光电二极管上时获得的光电二极管的输出信号与当二次光束和从偏转表面反射的主光束同时入射到光电二极管上时获得的光电二极管的输出信号不同 光电二极管,以便在主光束和次光束同时入射到光电二极管的时刻,为每一条扫描线输出扫描信号的开始。