DEVELOPING DEVICE, AND IMAGE FORMING APPARATUS

• Main Authors: GOTO GOSUKE, KOYANAGI MASAHITO, HASHIMOTO KAZUNORI
• Format: Patent
• Language: English; Japanese
• Published: 02.03.2015
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

PROBLEM TO BE SOLVED: To achieve a reduction in size and cost of a device and suppress the occurrence of image defects.SOLUTION: A developing device includes: a developing roller 3 that carries a toner 5 to be supplied to a photoreceptor drum 1 on the surface, and has first dielectric parts 31 and second dielectric parts 32 scattered on the surface; a developing blade 4 that regulates the thickness of the toner carried on the developing roller 3; and a charging auxiliary sheet 7 that is provided on the downstream side of a developing unit and upstream side of a regulation unit in the direction of rotation of the developing roller 3 and in contact with the developing roller 3, and can charge the toner carried on the developing roller 3, where the charging auxiliary sheet 7 is located between the first dielectric parts 31 and the second dielectric parts 32 on the triboelectric series. 【課題】装置の小型化及び低コスト化を実現し、かつ画像不良の発生を抑制する。【解決手段】感光体ドラム１へ供給するためのトナー５を表面に担持する現像ローラ３であって、第一誘電体部３１と第二誘電体部３２がその表面に散在する現像ローラ３と、現像ローラ３に担持されるトナーの層厚を規制する現像ブレード４と、現像ローラ３の回転方向において、現像部よりも下流側であって規制部よりも上流側で現像ローラ３と当接して設けられ、現像ローラ３に担持されるトナーを帯電可能な帯電補助シート７と、を備え、帯電系列上において、帯電補助シート７が第一誘電体部３１と第二誘電体部３２の間に位置する。【選択図】図２