Replaceable toner cartridge for use with an image forming...

Details Replaceable toner cartridge for use with an image forming... Replaceable toner cartridge for use with an image forming...

2005-09-06

2005-09-06

Royer, William J. (Department: 2852)

Electrophotography

Diagnostics

Unit or part identification

C399S013000

Reexamination Certificate

active

06941082

ABSTRACT:
An image forming apparatus includes a replaceable toner cartridge which, in turn, includes a magnetic chip records identifying information about the type of toner cartridge. The magnetic chip interacts with an identifying unit, to determine the compatibility of the toner cartridge. The magnetic chip is made from magnetic powder and non-magnetic powder compounded at an appropriate ratio at which a predetermined magnetic resistance is maintained. The identifying unit includes a magnetic sensor which detects magnetic resistance without contacting the magnetic chip. A microcomputer verifies whether the output detected by the magnetic sensor is greater than or equal to a predetermined level and within a range of criterion, to determine whether the toner cartridge is compatible with the image forming apparatus.

REFERENCES:
patent: 4963939 (1990-10-01), Kurando et al.
patent: 6477335 (2002-11-01), Surya et al.
patent: 6766119 (2004-07-01), Urabe
patent: 61-215575 (1986-09-01), None
patent: 2000-347503 (2000-12-01), None

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