Apparatus for acoustic noise reduction of office automation devi

Details Apparatus for acoustic noise reduction of office automation devi Apparatus for acoustic noise reduction of office automation devi

1994-12-22

1996-04-16

Dang, Khanh

Acoustics

Sound-modifying means

Housing or enclosure

181225, G10K 1100

Patent

active

055084770

ABSTRACT:
An acoustic noise reduction apparatus for an office automation device is provided on a surface of an outer shield of the office automation device and has a hole therethrough. The body member of the apparatus defines an internal volume which covers the hole. A control member is operatively connected with the body member and divides the body member into a hollow portion, a duct portion, and a silencer portion. The hollow portion and the duct portion form a Helmholtz resonator within the body member.

REFERENCES:
patent: 4215762 (1980-08-01), Cunningham et al.
patent: 4729452 (1988-03-01), Sims
patent: 4807718 (1989-02-01), Lotz

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