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    • 7. 发明授权
    • Image density control method using exclusive patterns for an image
forming apparatus
    • 使用图像形成装置的专用图案的图像浓度控制方法
    • US5045883A
    • 1991-09-03
    • US442503
    • 1989-11-28
    • Kouji IshigakiYasuji Takagi
    • Kouji IshigakiYasuji Takagi
    • G03G15/00G03G15/04G03G15/043G03G15/08
    • G03G15/5041G03G2215/00042
    • An image density control method for an image forming apparatus for forming a plurality of exclusive patterns on a photoconductive element, or image carrier, and controlling an image forming condition based on the exclusive patterns so as to control image density. The exclusive patterns include a high density black pattern and a low density white pattern. While a scanner included in the apparatus is brought to and held at a predetermined position, a latent image of the low densit white pattern is electrostatically formed on the photoconductive element. While the scanner is in a reciprocating motion, a latent image of the high density black pattern is formed on the photoconductive element. The plurality of patterns formed on the photoconductive element are sensed to correct toner density and background output based on sensed values, whereby accurate image density control is promoted.
    • 一种用于在光电导元件或图像载体上形成多个排列图案的图像形成装置的图像浓度控制方法,并且基于该排他图案来控制图像形成条件以便控制图像密度。 独家图案包括高密度黑色图案和低密度白色图案。 当包含在设备中的扫描器被带到并保持在预定位置时,低密度白色图案的潜像被静电地形成在光电导元件上。 当扫描仪往复运动时,在感光体上形成高密度黑色图案的潜像。 检测形成在感光元件上的多个图案,以便基于检测值来校正调色剂浓度和背景输出,从而促进精确的图像浓度控制。
    • 9. 发明授权
    • Image density control method for an image forming apparatus
    • 图像形成装置的图像浓度控制方法
    • US5028960A
    • 1991-07-02
    • US507241
    • 1990-04-10
    • Wataru YasudaMoriyuki KoikeMasaki TokuhashiKouji IshigakiYoshihiro Abe
    • Wataru YasudaMoriyuki KoikeMasaki TokuhashiKouji IshigakiYoshihiro Abe
    • G03G15/00
    • G03G15/5041G03G2215/00042
    • An image density control method for an image forming apparatus of the type forming a latent image of a document image on a photoconductive element and developing the latent image to form a toner image by an electrophotographic procedure. A background pattern is implemented as a light pattern having a low density and provided independently of a reference density pattern. The light pattern is illuminated to form a latent image thereof on the photoconductive element, and the latent image is developed by a toner. The density of the resultant toner image is sensed by an image density sensor. Such a procedure allows a change in background density ascribable to contamination, increase in background potential and so forth to be detected. The light pattern may be replaced with a leading edge portion of a document if the leading edge portion has a density corresponding to the background density. Then, the latent image of the background pattern will be formed under exactly the same conditions as the latent image of an ordinary image, i.e., without any limitations as to the position of the pattern.
    • 一种图像形成装置,用于在光电导元件上形成文件图像的潜像并使潜像显影以通过电子照相程序形成调色剂图像的图像形成装置。 背景图案被实现为具有低密度并独立于参考密度图案提供的光图案。 光图案被照亮以在光电导元件上形成潜像,并且潜像由调色剂显影。 所得调色剂图像的浓度由图像浓度传感器感测。 这样的过程允许由于污染引起的背景密度的变化,背景潜力的增加等被检测。 如果前缘部分具有对应于背景密度的密度,则可以用文档的前缘部分替换光图案。 然后,背景图案的潜像将形成在与普通图像的潜像完全相同的条件下,即对图案的位置没有任何限制。
    • 10. 发明授权
    • Image density control method for an image forming apparatus
    • 图像形成装置的图像浓度控制方法
    • US5258248A
    • 1993-11-02
    • US865660
    • 1992-04-07
    • Masaki TokuhashiMoriyuki KoikeWataru YasudaKouji IshigakiTakashi BisaijiChikara Imai
    • Masaki TokuhashiMoriyuki KoikeWataru YasudaKouji IshigakiTakashi BisaijiChikara Imai
    • G03G15/00G03G15/06G03G15/08
    • G03G15/065G03G15/5041G03G2215/00042
    • An image density control method for an image forming apparatus of the type forming a latent image of a document image on a photoconductive element and developing the latent image by a toner to produce a toner image by an electrophotographic procedure. A background pattern whose density is substantially the same as the background density of a document, i.e., a light pattern is illuminated to electrostatically form a latent image thereof on the photoconductive element. The latent image is developed by the toner, and the density of the resultant toner image is optically sensed by an image density sensor. A change in background density due to contamination or an increase in background potential, for example, is detected. Based on the detected change in background density, a quantity of light for imagewise exposure or similar factor dictating the developing ability is corrected, i.e., it is controlled to the light side if the density has been shifted to the dark side. The detection of the background density and the control for correction are effected only when the charge retaining ability of the photoconductive element is stable.
    • 一种图像形成装置,用于在感光体上形成原稿图像的潜像并通过调色剂显影潜像的图像形成装置,以通过电子照相程序产生调色剂图像。 背景图案的密度基本上与原稿的背景密度相同,即光图案被照亮以在感光体上静电地形成潜像。 潜像由调色剂显影,并且所得到的调色剂图像的浓度由图像浓度传感器光学感测。 检测到例如由于污染引起的背景浓度的变化或背景潜力的增加。 基于检测到的背景浓度的变化,校正用于图像曝光的光量或指示显影能力的类似因素,即如果密度已经向黑色侧移动,则将其控制到光侧。 仅当光电导元件的电荷保持能力稳定时才进行背景浓度的检测和校正控制。