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公开(公告)号：US10180647B2
公开(公告)日：2019-01-15
申请号：US15511953
申请日：2015-04-17
Applicant: S-Printing Solution Co., Ltd.
Inventor： Sung Weon Song , Young Min Yoon
Abstract: Disclosed herein is an image forming apparatus. The image forming apparatus includes a sensing unit having a window and a sensor which senses a developer through the window, and a shutter device which opens and closes the window, and thereby the sensing unit in a sensible state is maintained, and a lifetime thereof is extendable.
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