| US 7,495,683 B2 | ||
| Image forming apparatus and control method therefor | ||
| Shinichi Takata, Abiko (Japan); Akihiko Sakai, Abiko (Japan); Takuya Kawamura, Tokyo (Japan); and Yuichiro Maeda, Kashiwa (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, (Japan) | ||
| Filed on Jul. 11, 2006, as Appl. No. 11/456,683. | ||
| Claims priority of application No. 2005-203633 (JP), filed on Jul. 12, 2005; and application No. 2005-203634 (JP), filed on Jul. 12, 2005. | ||
| Prior Publication US 2007/0144362 A1, Jun. 28, 2007 | ||
| Int. Cl. B41J 2/385 (2006.01) | ||
| U.S. Cl. 347—116 | 5 Claims |
| 1. An image forming apparatus comprising:
an image forming portion for forming an image on an image carrier, for primarily transferring the image on the image carrier
onto an intermediate transfer member having a plurality of marks indicative of reference positions, to thereby form a color
image, and for secondarily transferring the image on the intermediate transfer member onto a recording material to thereby
carry out image formation;
a detecting portion for detecting the marks on the intermediate transfer member;
a controller for causing an image write reference signal, which is to be used to start image formation, to be generated based
on an output from said detecting portion; and
a determining portion for determining whether or not detection of the marks by said detecting portion is normal,
wherein said controller causes the image write reference signal to be generated based on detection of ones of the marks which
are determined to be normal by said determining portion, and causes an alternate signal, serving as the image write reference
signal, to be generated in association with any of the marks which are determined to be abnormal.
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