发明授权
US08096631B2 Ink-jet type image-forming apparatus and ink-jet type image-forming method
失效
喷墨式图像形成装置和喷墨型图像形成方法
- 专利标题： Ink-jet type image-forming apparatus and ink-jet type image-forming method
- 专利标题（中）： 喷墨式图像形成装置和喷墨型图像形成方法
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申请号： US12036089申请日： 2008-02-22
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公开(公告)号： US08096631B2公开(公告)日： 2012-01-17
- 发明人: Miho Kunimatsu
- 申请人： Miho Kunimatsu
- 申请人地址： JP Ibaraki
- 专利权人： Canon Finetech Inc.
- 当前专利权人： Canon Finetech Inc.
- 当前专利权人地址： JP Ibaraki
- 代理机构： patenttm.us
- 优先权： JP2007-055858 20070306
- 主分类号： B41J29/38
- IPC分类号： B41J29/38
摘要：
An image-forming apparatus is provided which prevents irregularity of an image density and improves the life of heating elements. In a half of recording heads (a group of recording heads 22K2, 22K4, 22K6 not adjacent to each other), off time T2 is shortened at a timing of PWM renewal 1; in the other recording heads (22K1, 22K3, 22K5, another group of the recording heads not adjacent to each other) the off time T2 is not changed at the timing of PWM renewal 1 but is shortened at the timing of PWM renewal 2. As the result, in the region corresponding to the timing from PWM renewal 1 to PWM renewal 2, the amount of the ink droplets ejected from the nozzles of the recording heads 22K2, 22K4, 22K6 is decreased to decrease slightly invisibly the image density formed by the ink droplets ejected from the nozzles 22K2, 22K4, 22K6.