| 摘要 |
<p>A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, includes an electrophotographic photosensitive drum; a developing member for developing an electrostatic latent image formed on the drum; a cartridge frame including a developer accommodating portion for accommodating a developer to be used by the developing member to develop t electrostatic latent image; a first light guide disposed at such a position as is adjacent one end of the cartridge frame with respect to direction of an axis of the drum and as is adjacent a leading end with respect to a mounting direction in which the process cartridge is mounted to a main assembly, the first light guide including a light entrance portion which is opposed to the emitting portion to receive the detecting light when the process cartridge is mounted to the main assembly, the first light guide being effective to guide the detecting light so as to cross with a developer accommodating space in the developer accommodating container; a second light guide disposed at such a position as is adjacent the one end of the cartridge frame and as is adjacent the leading end, the second light guide including a light exit portion which is opposed to the light receiving portion when the process cartridge is mounted to the main assembly, the second light guide being effective to direct the detecting light having passed through the developer accommodating space to light receiving portion; and a memory member communicatable with the main assembly, the memory member being disposed at such a position as is adjacent the one end of the cartridge frame and as is adjacent the leading end, the memory member including a cartridge electrical contact provided between a horizontal plane passing through the light entrance portion when the process cartridge is mounted to the main assembly and a horizontal plane passing through the light exit portion when the process cartridge is mounted to the main assembly. <IMAGE></p> |
