Patent ID: 6104888
Filing Date: 2000-08-15
Classification: G03G

Abstract:
A detecting system for use in an image forming apparatus, said image forming apparatus being detachably provided with a unit which cooperates with said image forming apparatus in an image formation of said image forming apparatus, wherein said detecting system detects whether said detachable unit is properly mounted in said image forming apparatus, comprising:a complementary circuit mounted in said detachable unit, said complementary circuit including a fuse and a first resistor connected in parallel with said fuse; anda main circuit mounted in said image forming apparatus, said main circuit includinga power source,a first circuit portion, said first circuit portion having a second resistor which is connected with said power source through said first circuit portion when said unit is mounted in said image forming apparatus,a second circuit portion, connected in parallel with said second resistor, said second circuit portion having a third resistor and a switch connected in serial with said third resistor,a detector for detecting a voltage or a current in a portion of said first circuit portion, anda third circuit portion, in response to said voltage or current detected by said detector, for closing said switch to blow said fuse.