Patent ID: 6701107
Filing Date: 2004-03-02
Classification: G03G

Abstract:
A unit detachably mountable to a main assembly of an electrophotographic image forming apparatus for forming an image on a recording material, the main assembly including a guiding portion, a positioning groove, a main assembly antenna, and an antenna cover for covering the main assembly antenna, said unit comprising:(a) a unit frame; (b) a guide, provided at each of one and the other ends, with respect to a direction crossing a mounting direction in which said unit is mounted to the main assembly, of said unit frame, for being guided by the guiding portion and for engaging the positioning groove; (c) a regulating abutting portion, provided at each of said one and the other ends and at a leading end, with respect to the mounting direction, of said unit, for preventing rotation of said unit about said guide by a torque received from the main assembly of the apparatus by abutting a fixed portion of the main assembly of the apparatus; and (d) a memory member supported by said unit frame, said memory member including: a base; a storing element, provided on said base, for storing information; a memory antenna, provided in said base, for sending the information stored in said storing element to the main assembly antenna when said memory member is mounted to the main assembly of the apparatus; a sending member, provided in said base, for sending the information stored in said storing element to said memory antenna; and an outer casing member covering said base provided with said storing element, said sending member and said memory antenna, wherein said memory member is disposed at the leading end in the mounting direction substantially at a central portion of said unit frame with respect to a direction crossing the mounting direction, wherein when said unit is mounted to the main assembly of the apparatus, said outer casing member abuts the antenna cover.