Patent ID: 6912366

Claim:
An image forming apparatus comprising: an opening and closing member being openable and closable; an exchangeable member detachably attachable to a body of said image forming apparatus and including a developer container for containing developer; developer amount detecting means for detecting an amount of the developer contained said developer container; a memory configured to store information concerning the amount of the developer detected by said detecting means; control means for causing said detecting means to perform a detection operation for the developer a plurality of times at a timing after the input of power into said image forming apparatus from a power source, after said exchangeable member is attached to the body of said image forming apparatus, or after said opening and closing member is closed, performing a confirmation process for confirming the amount of the developer on the basis of a result of said detection operation, and updating the information stored in said memory after confirming the amount of the developer; and output means for outputting the information stored in said memory, wherein said output means outputs the information concerning the amount of the developer stored in said memory, until the amount of the developer is confirmed by the confirmation process, from the timing after the input of power into said image forming apparatus from the power source, after said exchangeable member is attached to the body of said image forming apparatus, or after said opening and closing member is closed, and outputs the updated information after the amount of the developer is confirmed by the confirmation process.