444 results about "Resonance chamber" patented technology

A cellular phone having a first opening for delivering voice on a shell is provided. A printed circuit board (PCB) is disposed within an inner space enclosed by the shell and divides the inner space into a first acoustic room and a second acoustic room. A speaker is disposed within the first acoustic room and electrically connects the PCB. A through hole is formed on the PCB to communicate the first acoustic room and the second acoustic room to increase the size of total resonance chamber for improving resonance effect in low frequency voices. Furthermore, at least a second opening is formed on the shell to communicate the first acoustic room or the second acoustic room to the environment for flattening the resonance curve to improve the voice quality.

A stethoscope head for a one-way stethoscope with a membrane. The stethoscope has a funnel or bell-shaped resonance body. A membrane and the resonance body enclose a resonance chamber that is interconnected to the air column in the lumen of a tube. A capsule of a soundproof material completely surrounds a distal region of the resonance body without contact, leaving just an opening through which the tube passes. A suspension element of elastomer material forms a mobile connection between the capsule and the holding ring attached to the peripheral rim of the resonance body.

This invention provides a test method for one cavity multiple modes broad-band multiple points microwave medium multiple dielectric constants. By designing and producing a "clean" multiple frequency points, high Q cylindrical test resonance chamber of broad band and internal mould type, the method finishes identifying each target mode in the hollow resonator, thereto obtain the equivalent "cavity dimensions" of the required mode in the cavity and zero load quantity factor Q0. As for the resonantor loaded with medium, it uses test results by modes necessary for sublevel to compute frequencies of each interfered target mode finishing automatic search of resonate frequency of different modes after being interfered to test the resonate frequency of sample after loading and zero load quality factor Q0, finally, finishing test to multiple dielectric constants of different frequency according to the tested data.

The invention discloses a multifunctional self-excited oscillation abrasive water jet generating device, which comprises an upstream nozzle, a downstream nozzle, an adjusting screw, a resonance cylinder, a first end cover and a second end cover. The device is characterized in that: the left part of the inner wall cavity of an upstream nozzle bush is provided with a metal threaded bush, and the outer wall of the upstream nozzle is matched with the inner wall of the resonance cylinder; the adjusting screw passes through a connecting screw cap and is sequentially in fit connection with the central hole of the first end cover, a locking screw cap and the metal threaded bush; the upstream nozzle is arranged on the right middle part of the inner wall cavity of the upstream nozzle bush, and the downstream nozzle is arranged between the right end of the resonance cylinder and the second end cover; the right end of the upstream nozzle, the left end of the downstream nozzle and the inner wall of the resonance cylinder positioned between the upstream nozzle and the downstream nozzle form a resonance chamber; and an air inlet formed on the resonance cylinder and an adjusting screw mounting hole are communicated with the resonance chamber. The device has simple structure, and is convenient for operation; the device has multiple testing functions; and compared with other jet generating devices, not only the experiment time can be greatly shortened, but also the experiment expenditure can be saved.

Disclosed is a microspeaker with an inner resonance chamber, more particularly a microspeaker with an inner resonance chamber which improves quality of sound and enables slim and compact design of the microspeaker by blocking rearward sound generated at the rear side of the vibration plate to prevent interference of a rearward sound with a forward sound generated at the front side of a vibration plate and installing a chamber with a specific volume within the microspeaker to allow the rearward sound to cause resonance.

A mobile terminal comprising a sound output unit; and an internal antenna in communication with and located behind the sound output unit, wherein the internal antenna is adapted to allow transmission and reception of radio frequency signals, and formed to have a resonance chamber therein to allow resonance of sounds generated by the sound output unit.

The invention provides a generator capable of collecting acoustic energy, which combines a Helmholtz acoustic resonance cavity and a triboelectric nanometer generating component. The triboelectric nanometer generating component with thin membrane structures is arranged on the outer wall or at the opening position of the Helmholtz acoustic resonance cavity. Sound passes through the acoustic resonance cavity to allow an electrode layer and a frictional layer of the triboelectric nanometer generating component to mutually contact and separate and to generate electric energy on two electrode layers. The generator does not need to be provided with a vibrating membrane, and can reduce unnecessary acoustic energy loss, and efficiently convert sound energy into electric energy; the generate can be used as a sound sensor which does not need a power supply, and is a self-driven passive sound sensor.

A resonance chamber of mobile phone includes a shell (11) defining a resonance cavity (20) for receiving a speaker (50) therein. A plurality of holes (18) is defined in the shell facing to a first side of the speaker. A channel (30) is defined in the shell extending laterally from a second side opposite to the first side of the speaker and communicating with the resonance cavity. An opening (40) is defined in the shell to communicate the channel with the environment. The channel has a width and a length smaller than a wavelength of an acoustic wave generated by the speaker.

A protecting case assembly with foldable slim speaker for portable apparatus includes a protecting case attached with two hinge members and two slim speakers, like electret speakers, each attached with a hinge. Two hinges are correspondingly connected to the two hinge members so as to make the two slim speakers be rotatable between a close position and an open position. Furthermore, a resonance chamber of the protecting case receives a woofer. Next, the protecting case assembly can receive external multimedia signals from a portable apparatus through a Bluetooth module and output the signals through the electret speakers and the woofer to perform high quality sound effects. Therefore, according to the protecting case assembly, the user can use it to protect the portable apparatus whilst conveniently carrying better sound equipment in order to enjoy a high quality audio and video performance anytime and anywhere.

A speaker set (20) for an electronic product (100) includes a hollow shell (60), and a loudspeaker (50) accommodated in the shell. The shell includes at least a spacing plate (68) which divides an inner space of the shell into a first resonance chamber (61a) and a second resonance chamber (61b). The loudspeaker includes first tone holes (52) communicating with the first resonance chamber and second tone holes (54) communicating with the second resonance chamber. The second resonance chamber communicates with the first resonance chamber via at least an inverted hole (69) defined in the at least a spacing plate. The first resonance chamber communicates with a surrounding environment so that sound emitted from the first and second tone holes of the loudspeaker can be transferred to the surrounding environment.

The particulate material production method includes vibrating a particulate material composition liquid in a liquid column resonance chamber having at least one nozzle to form a standing wave in the particulate material composition liquid caused by liquid column resonance, so that droplets of the particulate material composition liquid are ejected in a droplet ejection direction from the nozzle so as to fly in a space in a flight direction; feeding a gas in a direction substantially perpendicular to the droplet ejection direction to change the flight direction of the ejected droplets; and solidifying the droplets in the space to produce a particulate material. The particulate material composition liquid includes at least a solvent and a component of the particulate material dissolved or dispersed in the solvent, and the nozzle is located at a location corresponding to an anitnode of the standing wave.

An acoustic resonance igniter uses high-pressure helium to heat a resonance cavity so a hot surface of the resonance cavity forms a source of ignition to a combustion chamber. The resonance cavity may be round or may extend linearly to increase the size of the hot surface. The combustion chamber is cooled by arranging a feed of hydrogen and oxygen which is oxygen rich and which becomes more so when ignition occurs. A second combustion chamber receives the combustion chamber output and adds additional hydrogen through ports tangential to the wall of the second combustion chamber to enrich the fuel ratio and cool the second combustion chamber. The acoustic resonance igniter is used to ignite a large rocket engine or to form a rocket thruster.

A pollution control apparatus and method reduces contaminants, such as NOx and SOx pollutants, from an effluent gas stream. The pollution control device includes a resonance chamber that ionizes the effluent gas stream. The contaminants of the effluent gas stream are destroyed in a non-thermal plasma reactor. The effluent gas is then cooled in a cooling unit to substantially place the effluent gas in a non-excited state prior to releasing the effluent gas into the environment or re-injecting the effluent gas into the source of the effluent gas. Re-association of the radical oxides into harmful pollutants is thereby substantially prevented.

Disclosed herein is a hermetic compressor. The hermetic compressor includes a suction muffler. The suction muffler includes an inlet part and a refrigerant guide pipe. The inlet part has a shape of a semi-flare pipe, and is spaced apart from an inlet pipe. The refrigerant guide pipe extends from an interior of a resonance chamber to communicate with a compression chamber. An expanding part having an enlarged diameter is provided at an inlet of the refrigerant guide pipe. The inlet part and the expanding part allow noises produced in the compression chamber to be doubly diffused, thus efficiently reducing the noises.

The invention relates to a wideband sound absorption structure combing mechanical impedance of composite resonance cavities with micropunch plates, and belongs to the technical field of environmental noise control. The wideband sound absorption structure comprises one or more layers of micropunch plates in the front of the structure and a mechanical impedance plate at the rear part of the structure, wherein the micropunch plates and the mechanical impedance plate are all fixed on a bracket; the mechanical impedance plate is formed by an elastically supported thin plate; Helmholtz resonance cavities are compositely arranged on the mechanical impedance plate; each Helmholtz resonance cavity consists of a cavity body and an insertion tube. According to the wideband sound absorption structure, Helmholtz resonance units are designed on the mechanical impedance plate, and the thicknesses of the resonance cavities are smaller, thus the whole structural thickness does not change too much. The micropunch plates can have good sound absorption effect for middle-frequency and high-frequency noises, and a plurality of absorption peaks can be generated at low frequency through a mechanical impedance unit and the Helmholtz resonance units, so that the whole structure can ensure good middle-frequency and high-frequency sound absorption performance and also has good sound absorption effect at low frequency.

A system and method for measuring glucose levels in a user's blood without having to draw a blood sample. A wave energy source emits wave energy. A resonance chamber is provided that receives the wave energy and produces a frequency oscillation. An opening leads into the resonance chamber that is small yet enables a significant amount of sample tissue to bulge through the opening. The sample tissue of the user is pressed against the opening. At least a portion of the sample tissue passes through the opening and into the resonance chamber. The sample tissue loads the resonance chamber and alters the frequency oscillation created by the resonance chamber. At least some of the altered frequency oscillation is indicative of blood glucose levels within the sample tissue.