Patent ID: 7793709

Claim:
A jet generating device comprising: a vibrating member which vibrates gas; a driving unit which drives the vibrating member; and a housing (a) which has at least one first opening and a first chamber containing the gas, (b) supports the vibrating member, and (c) is such that, of sounds generated as a result of vibrating the vibrating member, the sound having a maximum noise level has a predetermined frequency, the housing discharging the gas as pulsating gas through the at least one first opening as a result of driving the vibrating member, the first chamber being connected to the at least one first opening, wherein, the housing is configured to produce the predetermined frequency utilizing a length of the at least one first opening, an opening area of the at least one first opening, and a volume of the first chamber, the length being in a direction in which the gas which is vibrated as a result of driving the vibrating member is discharged from the at least one first opening, the predetermined frequency reduces the sounds audible to a user of a device associated with the jet generating device without reducing an amount of the discharged gas, and when a sound velocity is C[m/s], a volume of the first chamber is V 1 [m 3 ], an equivalent circular radius of an opening area of the at least one first opening is r 1 [m], the number of the at least one first opening is n 1 , and a length of the at least one first opening is L 1 [m], any one of {C/(2π)}[πr 1 2 /{V 1 /(1.2r 1 ·n 1 1/2 +L)}] 1/2 <1000 as the predetermined frequency, {C/(2π)}[πr 1 2 /{V 1 /(1.2r 1 ·n 1 1/2 +L)}] 1/2 <500 as the predetermined frequency {C/(2π)}[πr 1 2 /{V 1 /(1.2r 1 ·n 1 1/2 +L 1 )}] 1/2 <20 as the predetermined frequency, {C/(2π)}[πr 1 2 /{V 1 /(1.2r 1 ·n 1 1/2 +L 1 )}] 1/2 ≧6000 as the predetermined frequency, {C/(2π)}[πr 1 2 /{V 1 /(1.2r 1 ·n 1 1/2 +L 1 )}] 1/2 ≧10000 as the predetermined frequency, and {C/(2π)}[πr 1 2 /{V 1 /(1.2r 1 ·n 1 1/2 +L 1 )}] 1/2 ≧20000 as the predetermined frequency is satisfied.