Invention Grant
- Patent Title: Image forming apparatus
- Patent Title (中): 图像形成装置
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Application No.: US14613217Application Date: 2015-02-03
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Publication No.: US09229404B2Publication Date: 2016-01-05
- Inventor: Hiroki Sato
- Applicant: CANON KABUSHIKI KAISHA
- Applicant Address: JP Tokyo
- Assignee: Canon Kabushiki Kaisha
- Current Assignee: Canon Kabushiki Kaisha
- Current Assignee Address: JP Tokyo
- Agency: Canon USA, Inc. I.P. Division
- Priority: JP2012-102471 20120427
- Main IPC: G03G15/00
- IPC: G03G15/00 ; G03G15/01

Abstract:
An image forming apparatus includes an image bearing member, a controller controls a first and the second image forming unit to form a measurement image on the image bearing member, wherein the measurement image is composed with a first measurement image having a first color, and a second measurement image having a second color with a lower reflectance than the first color, a radiation unit emits a irradiation light to the measurement image, a light receiving unit receives a reflected light from the measurement image, a comparison unit compares a light amount of the reflected light from the measurement image with a threshold value, and a changing unit increases the threshold value, if a measurement time period during which a light amount of the reflected light from the measurement image is equal to or greater than the threshold value is longer than a predetermined time period.
Public/Granted literature
- US20150147078A1 IMAGE FORMING APPARATUS Public/Granted day:2015-05-28
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