To provide a hybrid type color image forming device which is satisfactorily constituted so that the miniaturization of a device, the increase of an accessing speed and high printing quality free from color slippage may be attained.
The color image forming device 20 is constituted of four developing units 21a, 21b, 21c and 21d for storing different color toner, image carrier drums 22a and 22b, an intermediate transfer belt 25 stretched to be laid between a driving roller 23 and a driven roller 24, cleaners 26a and 26b, electrostatic charging rollers 27a and 27b, laser beam exposure units 28a and 28b, a main power source 29, etc. Respective parts are constituted so that the following relations may be established; Lb=N1×π×D, Lb N2×π×R, and also, Pt=N3×π×R, provided that Lb denotes the peripheral length of the intermediate transfer belt 25, R denotes the diameter of the driving roller 23, D denotes the diameter of each image carrier drum 22a and 22b, Pt denotes a distance between two transfer parts and N1, N2 and N3 denote optional integer numbers. The image carrier drum is exposed with the laser beam 34 through an exposure through-hole of the developing unit.
SHIMIZU SHIGERU
EBISAWA ISAO
KAMEI KOICHI
TSUZUKI HANZO
UESUGI YOSHINORI
CASIO COMPUTER CO LTD