公开(公告)号：US20170308016A1

公开(公告)日：2017-10-26

申请号：US15511953

申请日：2015-04-17

Applicant: S-Printing Solution Co., Ltd.

Inventor： Sung Weon SONG ,  Young Min YOON

IPC: G03G15/00

CPC classification number: G03G15/5054 ,  G03G15/00 ,  G03G21/00 ,  G03G2215/00059

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.