Patent ID: 7254347

Claim:
A unit removably mounted to an electrophotographic image forming apparatus operable to form an image on a recording medium, the unit comprising: a drive force transmission member configured to engage with a body drive member of the apparatus in order to facilitate transmitting a drive force to the unit from the body drive member; a first positioning member provided at a first end of the unit in a longitudinal direction thereof and facilitating positioning the unit to the apparatus when the unit is to be mounted to the apparatus; a first unit electrical contact provided at the first end, the first unit electrical contact electrically connecting with a first body electrical contact of the apparatus when the first positioning member is mounted to the apparatus; a second positioning member provided at a second end in the longitudinal direction thereof and facilitating positioning the unit to the apparatus when the unit is to be mounted to the apparatus; and a second unit electrical contact provided at the second end and electrically connected with the first unit electrical contact, the second unit electrical contact electrically connecting with a second body electrical contact of the apparatus when the second positioning member is mounted to the apparatus, wherein an electrical connection state between the first unit electrical contact and the second unit electrical contact is detected through the first body electrical contact and the second body electrical contact with a body detecting unit of the apparatus.