| 摘要 |
An image forming apparatus includes optical sensor units provided opposed to an image bearing member; light blockers provided between the image bearing member and the optical sensor units, respectively, the blockers being movable between locking and exposing positions, respectively; calibration members provided where the light is incident when the blockers are in the blocking positions, respectively, the calibration members calibrating data acquired by the optical sensor units; a movable link connected with the blockers; a switching portion for switching the blockers between the exposing and blocking positions; and a positioning portion for determining the blocking position, the positioning portion being disposed at a position where at least one of the blockers is contacted to the positioning portion when the blockers are switched from the exposing positions to the blocking positions. |
| 主权项 |
1. An image forming apparatus comprising:
a movable image bearing member on which a toner image for adjustment is capable of being formed; a plurality of optical sensor units provided opposed to said image bearing member, said optical sensor units each projecting light to said image bearing member and detecting the light; a plurality of blocking members provided between said image bearing member and said optical sensor units, respectively, said blocking members being movable between blocking positions for blocking said optical sensor units from said image bearing member and exposing positions for exposing said optical sensor units toward said image bearing member, respectively; a plurality of calibration members provided at positions where the light from said optical sensor units corresponding to the blocking members is incident when said blocking members are in the blocking positions, respectively, said calibration members having predetermined reflection densities, wherein said calibration members are capable of calibrating data acquired by said optical sensor units; a movable link connected with said blocking members; a driving source for applying a force for moving said link; a switching portion configured to switch said blocking members between the exposing positions and the blocking positions, by driving said driving source; and a positioning portion configured to determine the blocking position of said blocking members, said positioning portion being disposed at a position where at least one of said blocking members is contacted to said positioning portion when said blocking members are switched from the exposing positions to the blocking positions. |
