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    • 1. 发明授权
    • Image display unit capable of tone reproduction
    • 能够进行色调再现的图像显示单元
    • US4622595A
    • 1986-11-11
    • US678877
    • 1984-12-06
    • Masayuki HisatakeHaruhiko MoriguchiToshiharu InuiAkio Noguchi
    • Masayuki HisatakeHaruhiko MoriguchiToshiharu InuiAkio Noguchi
    • B41J2/52B41J2/205H04N1/405H04N1/40H04N1/21H04N1/23
    • H04N1/4057
    • An image reproducing apparatus wherein a halftone of an image is reproduced by repeating a picture element pattern composed of a plurality of dots as a unit and each dot display density of which is gradually controlled. The repetition of the same picture element patterns is avoided to improve tone reproducing performance.The image display unit includes a means for determining a disposition of dots composing a specific picture element pattern, i.e., display density of each dot in response to tone density of the original image, a means for comparing the disposition of dots of the specific picture element pattern determined by said means with a dot disposition or dispositions of one or plural surrounding picture element pattern or patterns, and a means for changing the dot disposition of said specific picture element pattern in the case when it is identical with dot dispositions of a predetermined number or more of surrounding picture element patterns.
    • 一种图像再现装置,其中通过将由多个点组成的像素图案重复为一个单位并逐渐控制其每个点显示密度来再现图像的半色调。 避免重复相同的图像元素图案以改善色调再现性能。 图像显示单元包括用于确定构成特定图像元素图案的点的布置的装置,即响应于原始图像的色调密度的每个点的显示密度,用于比较特定图像元素的点的布置的装置 由所述装置确定的图案,其具有点布置或一个或多个周围图像元素图案或图案的布置,以及用于在与预定数量的点布置相同的情况下改变所述特定图素元素图案的点布置的装置 或更多的周围图像元素图案。
    • 8. 发明授权
    • Device for driving a laser diode and an electrophotography type image
forming apparatus using the same
    • 用于驱动激光二极管的装置和使用其的电子照相式图像形成装置
    • US5812174A
    • 1998-09-22
    • US753469
    • 1996-11-26
    • Akio NoguchiKatsuhisa Ogawa
    • Akio NoguchiKatsuhisa Ogawa
    • B41J2/44G02B26/10G03G15/04G06K15/12H04N1/04H04N1/113B41J2/47
    • G06K15/1219
    • An apparatus has a plurality of semiconductor cells as current switchings for driving a laser diode which exposes to light a photosensitive member so as to effect image recording. The semiconductor cells have each different characteristics, or same characteristics respectively. In response to the light amount signal corresponding to light quantity of the laser diode, a selector selects one or more of the semiconductor cells so as to supply a suitable driving current turned on or off later with an image signal. As a result, no fluctuations in the pulse duty ratio and the rise time are present in the entire driving current active range, thus improving the quality of a recorded image. The effect of selection by the selector is held for a certain recording time, whereby malfunction due to noises or the like can be avoided, and stable actions of the laser diode are ensured.
    • 一种装置具有多个半导体单元作为用于驱动激光二极管的电流开关,该激光二极管将感光构件暴露于光以便进行图像记录。 半导体单元分别具有不同的特性或相同的特性。 响应于与激光二极管的光量相对应的光量信号,选择器选择半导体单元中的一个或多个,以便稍后用图像信号提供合适的开启或关闭的驱动电流。 结果,在整个驱动电流有效范围内不存在脉冲占空比和上升时间的波动,从而提高记录图像的质量。 由选择器选择的效果保持一定的记录时间,由此可以避免由于噪声等引起的故障,并确保了激光二极管的稳定动作。
    • 10. 发明授权
    • Color image data processing device for correcting red ghosts of black
images
    • 彩色图像数据处理装置,用于校正黑色图像的红色重影
    • US4591905A
    • 1986-05-27
    • US571168
    • 1984-01-16
    • Akio Noguchi
    • Akio Noguchi
    • G03G15/22G06T5/00H04N1/46H04N1/48H04N1/58
    • H04N1/58
    • A color image data processing device in which the color for a target picture element is corrected in accordance with the combination of colors obtained for peripheral picture elements. The peripheral picture elements are arranged around the target picture element in a predetermined relationship. A memory outputs a signal which represents a color for the target picture elements with the signal being determined by the combination of colors obtained for the peripheral picture elements. A logic circuit receives the signal from the memory and logically combines the signal with a second signal obtained from the target picture element which represents a color for the target picture element. The logic circuit then outputs a corrected color signal determined by the logical operations on its two input signals. In the preferred embodiment, the memory output signal can override the detected color for the target picture element when the detected color is red but cannot override a detected black color for the target picture element, thereby allowing correction of red ghosts of black picture elements.
    • 一种彩色图像数据处理装置,其中根据为周边图像元素获得的颜色的组合来校正目标像素的颜色。 周边图像元素以预定关系布置在目标像素周围。 存储器输出表示目标像素的颜色的信号,该信号由通过对周边图像元素获得的颜色的组合来确定。 逻辑电路从存储器接收信号,并将信号与从表示目标像素的颜色的目标像素获得的第二信号进行逻辑组合。 然后,逻辑电路输出由其两个输入信号通过逻辑运算确定的校正颜色信号。 在优选实施例中,当检测到的颜色为红色时,存储器输出信号可以覆盖目标像素的检测颜色,但是不能覆盖目标像素的检测到的黑色,从而允许校正黑色图像元素的红色重影。