Image forming apparatus to detect amount of remaining developer

An image forming apparatus comprising:

• an image bearing member configured to bear an electrostatic latent image;
• a developing device including a first electrode member and a second electrode member, wherein the developing device is configured to store a developer and use the stored developer to develop the electrostatic latent image;
• a holding unit configured to hold and change the developing device to a first posture in which the developer is deposited on the first electrode and the second electrode and to a second posture in which the developer deposited on the first electrode and the second electrode in the first posture falls off;
• and
• a detection device configured to detect an amount of remaining developer in the developing device based on a first capacitance C1 between the first electrode member and the second electrode member in the first posture and a second capacitance C2 between the first electrode member and the second electrode member in the second posture.

An image forming apparatus comprising:

• an image bearing member configured to bear an electrostatic latent image;
• a developing device including a first electrode member and a second electrode member, wherein the developing device is configured to store a developer and use the stored developer to develop the electrostatic latent image;
• a holding unit configured to hold and change the developing device to a first posture and to a second posture;
• and
• a detection device configured to detect an amount of remaining developer in the developing device based on a first capacitance C1 between the first electrode member and the second electrode member in the first posture and a second capacitance C2 between the first electrode member and the second electrode member in the second posture,
• wherein the detection device is configured to detect the amount of remaining developer based on a difference between the first capacitance C1 and the second capacitance C2.

An image forming apparatus comprising:

• an image bearing member configured to bear an electrostatic latent image;
• a developing device including a first electrode member and a second electrode member, wherein the developing device is configured to store a developer and use the stored developer to develop the electrostatic latent image;
• a holding unit configured to hold and change the developing device to a first posture and to a second posture;
• and
• a detection device configured to detect an amount of remaining developer in the developing device based on a first capacitance C1 between the first electrode member and the second electrode member in the first posture and a second capacitance C2 between the first electrode member and the second electrode member in the second posture,
• wherein the detection device is configured to detect the amount of remaining developer based on a ratio between the first capacitance C1 and the second capacitance C2.