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    • 2. 发明授权
    • Image forming apparatus and image forming method
    • 图像形成装置及图像形成方法
    • US07466464B2
    • 2008-12-16
    • US11812861
    • 2007-06-22
    • Rintaro NakaneShigeru FujiwaraHideaki Fukaya
    • Rintaro NakaneShigeru FujiwaraHideaki Fukaya
    • G03F3/08
    • H04N1/40006H04N1/4076
    • A gradation pattern is printed, the gradation pattern is corrected with a gamma correction table TO based on a result in which the printed gradation pattern is read, the corrected gradation pattern is printed on a photosensitive drum or the like, and a measured density of the printed gradation pattern in S4 is stored as a reference value of density DR. Thereafter, without user's operation, at a set automatic timing, the read gradation pattern P is corrected with the gamma correction table TO and printed on the photosensitive drum or the like, density deviation ΔD between a measured density D of the printed gradation pattern in S6 and the reference value of density DR is determined, and the latest gamma correction table T is generated and updated on the basis of the density deviation ΔD. Consequently, high-quality image formation can be automatically performed.
    • 印刷渐变图案,基于读取印刷的渐变图案的结果,校正的渐变图案被印刷在感光鼓等上,用灰度校正表TO校正灰度图案,并且测量的浓度 S4中的打印灰度图案被存储为密度DR的参考值。 此后,在设定的自动定时下,读出的灰度图案P用伽马校正表TO进行校正并印刷在感光鼓等上,S6中印刷的渐变图案的测量密度D之间的浓度偏差DeltaD 并且确定密度DR的参考值,并且基于密度偏差DeltaD生成和更新最新的伽马校正表T. 因此,可以自动执行高质量的图像形成。
    • 3. 发明授权
    • Image forming apparatus with density control
    • 具有密度控制的图像形成装置
    • US06529694B1
    • 2003-03-04
    • US10015639
    • 2001-12-17
    • Hideaki FukayaRintaro NakaneShigeru Fujiwara
    • Hideaki FukayaRintaro NakaneShigeru Fujiwara
    • G03L1500
    • G03G15/5058G03G2215/0119
    • There is disclosed an image forming apparatus in which photosensitive member properties including potential properties of an exposed portion and unexposed portion of the surface of a photosensitive member irradiated with a light beam are estimated. An appropriate contrast potential and a developing bias voltage and charging grid bias voltage suitable for forming a high-density image are determined by a feedback control based on the photosensitive member properties. A laser power is changed to form an intermediate-density image whose density agrees with an intermediate-density target value. When the laser power is changed, the photosensitive member property changes. Therefore, the photosensitive member property is re-estimated, and the developing bias voltage and charging grid bias voltage are set again while maintaining the appropriate contrast potential.
    • 公开了一种图像形成装置,其中估计了包含曝光部分的电位特性和照射光束的感光构件的表面的未曝光部分的感光构件性质。 通过基于感光构件性质的反馈控制来确定适合于形成高密度图像的适当的对比度电位和显影偏压和充电栅极偏置电压。 改变激光功率以形成密度与中密度目标值一致的中密度图像。 当激光功率改变时,光敏元件性能改变。 因此,重新估计感光构件特性,并且在保持适当的对比度电位的同时再次设置显影偏压和充电栅极偏置电压。
    • 4. 发明授权
    • Image forming apparatus and image forming method
    • 图像形成装置及图像形成方法
    • US07236276B2
    • 2007-06-26
    • US10392302
    • 2003-03-20
    • Rintaro NakaneShigeru FujiwaraHideaki Fukaya
    • Rintaro NakaneShigeru FujiwaraHideaki Fukaya
    • G03F3/08
    • H04N1/40006H04N1/4076
    • A gradation pattern is printed, the gradation pattern is corrected with a gamma correction table TO based on a result in which the printed gradation pattern is read, the corrected gradation pattern is printed on a photosensitive drum or the like, and a measured density of the printed gradation pattern in S4 is stored as a reference value of density DR. Thereafter, without user's operation, at a set automatic timing, the read gradation pattern P is corrected with the gamma correction table TO and printed on the photosensitive drum or the like, density deviation ΔD between a measured density D of the printed gradation pattern in S6 and the reference value of density DR is determined, and the latest gamma correction table T is generated and updated on the basis of the density deviation ΔD. Consequently, high-quality image formation can be automatically performed.
    • 打印渐变图案,基于读取打印的渐变图案的结果,将校正的灰度图案印刷在感光鼓上或者将感光鼓打印到灰度校正表T O0 并且将S 4中的印刷灰度图案的测量密度存储为密度D R R的参考值。 此后,在没有用户操作的情况下,在设定的自动定时时,读取的灰度图案P用伽马校正表T O O 0进行校正并打印在感光鼓等上,测量密度之间的密度偏差ΔD 确定S 6中的印刷灰度图案的D和密度D 的参考值,并且基于密度偏差DeltaD生成和更新最新的伽马校正表T. 因此,可以自动执行高质量的图像形成。