Patent ID: 7933531
Filing Date: 2011-04-26
Classification: G03G

Abstract:
1. An image formation device of an electrophotographic type for forming an image on a sheet by transferring a developing agent to the sheet, comprising: an image transfer unit which is attached to a main body of the image formation device in a detachable manner and includes an image transfer member to which the developing agent can be transferred; a density detecting unit which includes a detector unit having a light emitting unit and a light receiving unit and thereby detects density of the developing agent transferred to the image transfer member; a protective cover which protects the density detecting unit by covering the detector unit when the density detecting unit does not detect the density of the developing agent transferred to the image transfer member; a first reflecting part and a second reflecting part differing in reflectivity which are formed in a part of the protective cover facing the detector unit when the protective cover covers the detector unit; and a shifting unit which shifts the protective cover relative to the density detecting unit in conjunction with attachment/detachment of the image transfer unit to/from the main body, wherein the shifting unit places the protective cover at a first position for letting the first reflecting part face the detector unit when the image transfer unit has been attached to the main body, while placing the protective cover at a second position for letting the second reflecting part face the detector unit when the image transfer unit has not been attached to the main body.