| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a constitution capable of suppressing the internal contamination of an image forming apparatus and soil on a recording paper by suppressing the leakage of toner cloud from a developing unit, and also, capable of attaining the facilitation of a filter replacing work and avoiding the economical waste in replacing the filter. <P>SOLUTION: The image forming apparatus is provided with photoreceptor units 1Y, 1M, 1C and 1K separately having a photoreceptor drum 11, and freely attachably/detachaly loaded to the image forming apparatus body, and developing units 4Y, 4M, 4C and 4K separately having an air draining opening 41d for draining the internal air, and a ventilation duct 18 having a dust collecting filter 19 therein is arranged in each photoreceptor unit 1Y, 1M, 1C and 1K, and the air drained through the air draining opening 41d of each developing unit 4Y, 4M, 4C and 4K is discharged through the ventilation duct 18. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
