DEVELOPMENT CONTAINER AND IMAGE FORMING APPARATUS

• Main Authors: SEKURA YUKI, HOSHINO YUTA, ONISHI NAOKI, MAEDA NAOYA, OHASHI SHIRO, MATSUNAE HIDE, YAMADA MINORU
• Format: Patent
• Language: English; Japanese
• Published: 18.04.2019
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To improve the accuracy in detecting the concentration of toner in a developer, compared with a case where a magnet is attached to an attachment surface on the downstream side in the rotation direction of a blade member that has a tip passing from above to below at an interval with a detection surface of a detection member.SOLUTION: A development container 140 comprises: a second storage unit 154 that stores a developer G containing magnetic carrier and toner; a toner concentration sensor 170 that has a detection surface 172A exposed inside the second storage unit 154, and detects the concentration of toner in the developer G; a blade member 173 that is provided on a rotation shaft 143A arranged inside the second storage unit 154, and has a tip 173A passing from above to below at an interval with the detection surface 172A in association with the rotation of the rotation shaft 143A; and a magnet 200 that is attached to an attachment surface 175 on the upstream side in the rotation direction K2 of the blade member 173.SELECTED DRAWING: Figure 3 【課題】検出部材の検出面に先端部が間隔をあけて上側から下側に通過する羽部材の回転方向の下流側の取付面に磁石が取り付けられている場合と比較し、現像剤のトナー濃度の検出精度を高くする。【解決手段】現像容器１４０は、磁性キャリア及びトナーを含む現像剤Ｇが収容された第二収容部１５４と、第二収容部１５４内に検出面１７２Ａが露出し現像剤Ｇのトナー濃度を検出するトナー濃度センサー１７０と、第二収容部１５４内に配置された回転軸１４３Ａに設けられ回転軸１４３Ａの回転に伴って先端部１７３Ａが検出面１７２Ａに間隔をあけて上側から下側に通過する羽部材１７３と、羽部材１７３の回転方向Ｋ２の上流側の取付面１７５に取り付けられた磁石２００と、を備えている。【選択図】図３