公开(公告)号：US06215968B1

公开(公告)日：2001-04-10

申请号：US09545721

申请日：2000-04-07

申请人： Makoto Uehara ,  Toshihiro Ohta ,  Yasutaka Maeda ,  Takashi Kitagawa ,  Katsuhiro Nagayama ,  Shouji Tomita ,  Kaori Dakeshita ,  Daisaku Imaizumi

发明人： Makoto Uehara ,  Toshihiro Ohta ,  Yasutaka Maeda ,  Takashi Kitagawa ,  Katsuhiro Nagayama ,  Shouji Tomita ,  Kaori Dakeshita ,  Daisaku Imaizumi

IPC分类号： G03G1500

CPC分类号： H04N1/4078

摘要： A high density detecting toner pattern is formed on a photosensitive body and a high density correction is effected by comparing a value detected by a reflection sensor with a high density reference value so as to maintain an image density at a specific level. An image density correcting section adopts a result of the preceding high density correction as the high density reference value, and compares the same with a result of a current high density correction. The image density correcting section effects the half-tone density correction only when a difference reaches or exceeds a preset difference reference value by forming a half-tone density detecting toner pattern on the photosensitive body and comparing a value detected by the reflection sensor with a half-tone reference value. Consequently, it has become possible to provide an image forming apparatus which can maintain a density output of an entire image at a specific level for any kind of images including solid, line, and half-tone, etc. while shortening a time required for the density correction and reducing a quantity of toner consumed for the density correction.

摘要翻译： 在感光体上形成高密度检测调色剂图案，并且通过将由反射传感器检测的值与高密度参考值进行比较来实现高密度校正，以将图像浓度保持在特定水平。 图像浓度校正部分采用先前的高浓度校正的结果作为高密度参考值，并将其与当前高密度校正的结果进行比较。 图像浓度校正部仅通过在感光体上形成半色调浓度检测调色剂图案而将差分达到或超过预设差值基准值来实现半色调浓度校正，并将反射传感器检测到的值与半 参考值。 因此，可以提供一种图像形成装置，其可以将包括实线，线条和半色调等的任何种类的图像的整个图像的浓度输出保持在特定的水平，同时缩短所需的时间 密度校正和减少密度校正所消耗的调色剂量。