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11.发明授权Image forming apparatus for having an arbitrary number of screen lines and screen angles by controlling pixel dot recording timing 失效用于通过控制像素点记录定时来具有任意数量的屏幕线和屏幕角度的图像形成装置
公开(公告)号：US6121997A
公开(公告)日：2000-09-19
申请号：US712800
申请日：1996-09-12
申请人： Satoru Fukushima
发明人： Satoru Fukushima
IPC分类号： G03G15/01 , B41J2/21 , B41J2/325 , B41J2/47 , B41J2/525 , H04N1/52 , G01D15/34 , G02B26/00 , G02B27/00
摘要： The present invention discloses an image forming apparatus capable of preventing generation of color shade and moire fringes and forming an image exhibiting excellent image quality by setting recording intervals, which are different for each of a plurality of color signals, and by forming a color image having the number of screen lines and screen angles different for respective color signals in accordance with the set recording intervals.
摘要翻译： 本发明公开了一种图像形成装置，其能够通过设定与多个彩色信号中的每一个不同的记录间隔，并且通过形成具有彩色图像和彩色图像的彩色图像，能够防止产生色调和莫尔条纹，并且形成具有优异图像质量的图像 根据设定的记录间隔，各颜色信号的屏幕线数和屏幕角度不同。
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12.发明授权Image forming apparatus and a controlling method of an image forming apparatus 失效图像形成装置和图像形成装置的控制方法
公开(公告)号：US6115561A
公开(公告)日：2000-09-05
申请号：US896546
申请日：1997-07-18
申请人： Satoru Fukushima
发明人： Satoru Fukushima
CPC分类号： G03G15/0849 , G03G15/0855 , G03G15/5041 , G03G2215/00042
摘要： The present invention corrects and controls both short-term changes in the density and gradation of the obtained image due to changes in the environment and the like, and long-term changes in the density and gradation of the obtained image due to changes in the properties of the photosensitive member and the developer during a long use period using two kinds of density control operations. In first density control, a predetermined pattern is formed on a recording material via a visual-image forming process, and a contrast potential and an LUT (look-up table) for gamma conversion are set based on the value of density of the formed pattern and in a second density control, control is performed by controlling an amount of replenishment of a toner according to a first reference value, which is corrected based on the difference between the value of density of a pattern formed on a photosensitive drum and a second reference value, thereafter a pattern is formed on the photosensitive drum by driving the visual-image forming process with a parameter set in the first density control, and the first and second reference values are corrected based on the value of density of the formed pattern.
摘要翻译： 本发明由于环境变化等而对获得的图像的浓度和灰度的短期变化进行校正和控制，并且由于性能的变化而导致的图像的浓度和灰度的长期变化 在长期使用期间使用两种密度控制操作。 在第一密度控制中，通过视觉图像形成处理在记录材料上形成预定图案，并且基于所形成的图案的浓度的值来设置用于伽马变换的对比度电位和LUT（查找表） 并且在第二密度控制中，通过根据第一参考值控制调色剂的补充量来进行控制，该第一参考值是基于感光鼓上形成的图案的密度值与第二参考值之间的差校正的 然后，通过在第一密度控制中设定的参数驱动视觉图像形成处理，在感光鼓上形成图案，并且基于形成的图案的密度值校正第一和第二参考值。
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13.发明授权Image forming apparatus which forms halftone images mixed with characters and fine lines 失效形成与字符和细线混合的半色调图像的图像形成装置
公开(公告)号：US5467196A
公开(公告)日：1995-11-14
申请号：US407398
申请日：1995-03-17
申请人： Satoru Fukushima , Sono Gu , Yoshito Mizoguchi
发明人： Satoru Fukushima , Sono Gu , Yoshito Mizoguchi
CPC分类号： H04N1/4074
摘要： When forming an image in which a half-tone image area such as photograph, screen, or the like and characters and fine lines exist the half-tone image area and the character and fine line portion are stably reproduced without deteriorating the picture qualities of both of them and, particularly, the character and fine line portion can be clearly reproduced. A digital image signal generated from an image reader is stored into an image memory on a pixel unit basis. A CPU subsequently reads the stored digital image signal and forms a frequency distribution function (density histogram) as a detection frequency of corresponding density values every pixel. The density level value of the portion in which the detection frequency is locally high is detected from the formed density histogram. The density level values are converted into at least one density value by a gradation correction circuit. An image having an excellent gradation reproducibility in a range from a low density portion to a high density portion can be formed by the converted density value.
摘要翻译： 当形成其中存在诸如照片，画面等的半色调图像区域和字符和细线的图像时，半色调图像区域和字符和细线部分被稳定再现，而不会降低两者的图像质量 并且特别地，可以清楚地再现字符和细线部分。 从图像读取器生成的数字图像信号以像素单位存储在图像存储器中。 CPU随后读取所存储的数字图像信号，并且形成频率分布函数（密度直方图）作为每个像素的相应浓度值的检测频率。 从形成的密度直方图中检测检测频率局部高的部分的浓度级值。 通过灰度校正电路将浓度水平值转换成至少一个浓度值。 可以通过转换的密度值形成从低密度部分到高密度部分的范围内具有优异的灰度再现性的图像。
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14.发明授权Image forming apparatus for supplying different amounts of electric charge to an end portion of a transfer material 失效图像形成装置，用于将电荷的不同电量提供给转移材料的末端部分
公开(公告)号：US5083167A
公开(公告)日：1992-01-21
申请号：US519764
申请日：1990-05-07
CPC分类号： G03G15/1645 , G03G15/0131 , G03G2215/0177 , G03G2215/018
摘要： An image forming apparatus includes a movable image bearing member; an image forming device for forming a toner image on the image bearing member; a transfer device for electrostatically transferring the toner image from the image bearing member onto a transfer material at an image transfer position; a transfer material carrying device for carrying the transfer material to the transfer position; wherein the transfer device supplies different electric charge amount per unit area to an end of the transfer material in a direction of conveyance of the transfer material by the transfer material carrying device and to another portion of the transfer material.
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