Patent ID: 7373098

Claim:
A toner cartridge horizontally installed in an electrophotographic printer having a photoreceptor drum where an electrostatic latent image is formed by charging and exposure, and contributing to toner supply and development, the toner cartridge comprising: a housing filled with a toner of a predetermined color; a development roller rotatably installed on the housing to face the photoreceptor drum and to supply the toner to the photoreceptor drum to develop an image by a difference in electrical potential; a supply roller rotatably installed in the housing in contact with the development roller to control the toner to adhere to the development roller; and a guide member coupled to the housing and disposed entirely below the center of the supply roller to guide the toner to be supplied to the development roller through the supply roller, wherein, when a diameter of the development roller is D 2 , the diameter D 2 satisfies an inequality that 10.4≦D 2 ≦22.1 mm, wherein a height of the housing is between 26 and 33 mm inclusive.