Photocopying – Contact printing – Light boxes
Patent
1991-12-19
1993-09-14
Picard, Leo P.
Photocopying
Contact printing
Light boxes
381 71, G03G 2100
Patent
active
052453855
ABSTRACT:
An image forming apparatus reduces the level of noise escaping therefrom via an opening. The noise is generated from a motor which drives an image forming part in the image forming apparatus, from a radiator fan which radiates heat inside the apparatus to the outside via the opening, and from an exhaust fan which passes harmful air through a filter and then exhausts harmless air to the outside via the opening. The image forming apparatus generates a predetermined sound wave and collides it with the noise so that the predetermined sound wave and noise cancel each other out.
Fukumizu Kenji
Ishikawa Fumihiko
Kanda Satoshi
Kitagawa Hiroo
Koike Tadao
Horgan Christopher
Picard Leo P.
Ricoh & Company, Ltd.
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