Apparatus for acoustic noise reduction of office automation devices utilizing Helmholtz resonance theory
AssigneeRicoh Company, Ltd.
InventorsMasahiko Kato, Naoki Kozuka
Life of this patent
Estimating the term…
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.
Claims13
An acoustic noise reduction apparatus for an office automation device having an outer shield and a hole through the outer shield, said apparatus comprising:
- a body member mounted on a surface of said outer shield so as to cover said hole, said body member enclosing an internal volume communicating with said hole;
- a control member positioned in said body member so as to divide said internal volume into a hollow portion, a duct portion and a silencer portion, wherein said duct portion communicates said hollow portion and said silencer portion one another, and wherein said hollow portion and said duct portion form a Helmholtz resonator within said body member.
An acoustic noise reduction apparatus for an office automation device having an outer shield and a hole through the outer shield, said apparatus comprising:
- a noise detection means for detecting a frequency dispersion of acoustic noise from the office automation device;
- a body member mounted on a surface of said outer shield so as to cover said hole, said body member enclosing an internal volume communicating with said hole;
- a control member positioned in said body member, so as to divide said internal volume into a hollow portion, a duct portion, and a silencer portion, wherein said duct portion communicates said hollow portion and said silencer portion with one another, and wherein said hollow portion and said duct portion form a Helmholtz resonator within said body member, said control member having at least one parameter which is adjustable so as to adjust a resonance frequency of said Helmholtz resonator;
- and
- driving means for adjusting said parameter as a function of the detected frequency dispersion.
An acoustic noise reduction apparatus for an office automation device having an outer shield and a hole through the outer shield, said apparatus comprising:
- status detection means for detecting a status of the office automation device;
- a body member mounted on a surface of said outer shield so as to cover said hole, said body member enclosing an internal volume communicating with said hole;
- a control member positioned in said body member, so as to divide said internal volume into a hollow portion, a duct portion, and a silencer portion, wherein said duct portion communicates said hollow portion and said silencer portion with one another, and wherein said hollow portion and said duct portion form a Helmholtz resonator within said body member, said control member having at least one parameter which is adjustable so as to adjust a resonance frequency of said Helmholtz resonator;
- and
- driving means for adjusting said parameter as a function of the detected frequency dispersion.
Dependencies are inferred from the claim text.