Detachable body and image forming apparatus

1. A detachable body comprising:

a detachable body main body that is to be attached to an attachment/detachment subject apparatus in a detachable manner, the detachable main body having an internal space and a connection hole which connects the internal space and an external space; and

an opening/closing member that is attached to the detachable body main body, the opening/closing member being movable between an opening position where the connection hole is exposed and a closing position where the connection hole is closed, the opening/closing member comprising: an opening/closing member main body that is curved parallel with a movement direction of the opening/closing member between the opening position and the closing position; and

a plane portion comprises a flat surface, the plane portion disposed on an outer surface of the opening/closing member main body.

2. The detachable body according to claim 1 , wherein the plane portion is formed with a recess which is recessed inward from the plane portion.

3. The detachable body according to claim 1 , further comprising: a sealing member that is capable of sealing the connection hole; and a support portion that is provided on an inner surface of the opening/closing member main body, the support portion supporting the sealing member, wherein the plane portion is formed in the outer surface of the opening/closing member main body at such a position as to correspond to the support portion.

4. The detachable body according to claim 1 further comprising: a projection that projects inward from an inner surface of the opening/closing member main body, the projection having a projection height that is larger than a maximum distance in a projection direction of the projection between the plane portion and the outer surface of the opening/closing member main body.

5. The detachable body according to claim 1 , wherein the plane portion is formed at a position that is deviated from the center of the outer surface of the opening/closing member main body toward one end thereof in the movement direction of the opening/closing member.

6. An image forming apparatus comprising: the detachable body according to claim 1 which contains developer inside; and an image forming apparatus main body to which the detachable body is attached in a detachable manner, for forming an image on a medium.

7. The image forming apparatus according to claim 6 , wherein the image forming apparatus main body has an attachment/detachment subject member to which the detachable body is to be attached in a detachable manner and a restriction portion which is formed at a preset position in the attachment/detachment subject member so as to correspond to one of plural kinds of detachable bodies; and that the detachable body has an identification portion which is formed at a preset position with respect to the plane portion according to a type of the detachable body, wherein the identification portion allows the detachable body to be attached to the image forming apparatus main body by engaging with the restriction portion if the type of the detachable body and a type of the image forming apparatus main body correspond to each other, and the identification portion prevents the detachable body from being attached to the image forming apparatus main body by interfering with the restriction portion if the type of the detachable body and a type of the image forming apparatus main body do not correspond to each other.

8. The detachable body according to claim 1 , wherein the plane portion faces in a radial direction of the opening/closing member.

9. The detachable body according to claim 1 , wherein the plane portion is located at a position that is deviated from a center of the outer surface of the opening/closing member main body in the circumferential direction.