Abstract: A developing device includes a developing roller, a frame body having an accommodating portion for accommodating developer, and a first conductive portion and a second conductive portion integrally molded. The first conductive portion includes a first electrode portion exposed from the frame body inside the accommodating portion and a first electrical contact portion electrically connected to the first electrode portion and exposed from the frame body outside the accommodating portion. The second conductive portion includes a second electrode portion exposed from the frame body inside the accommodating portion and a second electrical contact portion electrically connected to the second electrode portion and exposed from the frame body outside the accommodating portion. The first electrode portion and the second electrode portion are disposed so as to face each other with a space therebetween and function as a capacitor.

Abstract: A developing apparatus includes an accommodation portion for developer, a conveying member with a rotating shaft and sheet for conveying developer, and a sensing portion with first and second conducting members for sensing electrostatic capacitance based on developer amount. An accommodation portion frame body features a recessed portion with intersecting first and second inner wall faces bearing the conducting members. The recessed portion extends from an inner side of the accommodation portion toward an outer side. During image formation, the first inner wall faces downward while the second inner wall faces upward with an inclination angle exceeding the developer's angle of repose. The intersection line of imaginary lines passing through these wall faces lies below the rotation axis line.

Abstract: A developing device includes a developing roller, a resin frame, a sealing member, a first resin sheet, and a second resin sheet. The second resin sheet is arranged with the first resin sheet in a first direction on a side downstream of the first resin sheet. The resin frame includes a bearing surface, and first to third injection port marks. The bearing surface extends in a second direction crossing the first direction on a side downstream of the second resin sheet with respect to the first direction. The first and second injection port marks are provided on a side upstream of the first resin sheet with respect to the first direction and are arranged in the second direction. The third injection port mark is provided on a side downstream of the second sheet and upstream of the bearing surface with respect to the first direction.

Abstract: When a cartridge is in a posture in which it is installed in an image forming apparatus and used for image formation, a developing chamber is positioned below a storage chamber. At least a portion of an opening is located above a supply roller. A stirring shaft is located above the opening. A second stirring sheet member is provided on the side opposite to a first stirring sheet member with respect to an imaginary line passing through the center of rotation of the stirring shaft. The first stirring sheet member and the second stirring sheet member each have a length that allows the other ends thereof to reach the opening when the stirring shaft rotates.

Abstract: In a developing apparatus, a support member of a regulating member for regulating the thickness of a layer of developer has a recessed portion, on a side the same as a first end of a frame body, the recessed portion being recessed in an intersecting direction with respect to a rotation axis of a developing roller; the frame body has protruding portions including a first protruding portion and a second protruding portion, being aligned with respect to each other, with a gap therebetween, in the direction of the rotation axis, and protruding in the intersecting direction; and by an engagement between the protruding portion and the recessed portion, the support member is positioned with respect to the frame body; and the space in the first end and to be sealed by a sealing member communicates with outside of the frame body via the gap.