34results about How to "Improve low frequency sensitivity" patented technology

The invention discloses an intelligent head-mounted device, and the device comprises a lens and a leg part, the lens is connected with the leg part, and the leg part is internally provided with a cavity; the sound production device is arranged in the cavity, and the cavity is divided into a front sound cavity and a rear sound cavity by the sound production device; the sound outlet hole is formed in the leg part and is communicated with the front sound cavity; the main sound leakage hole and the auxiliary sound leakage hole are formed in the leg part, and the main sound leakage hole and the auxiliary sound leakage hole are communicated with the rear sound cavity; the positions of the sound outlet hole, the main sound leakage hole and the auxiliary sound leakage hole are configured as follows: when a wearer wears the intelligent head-mounted device, the sound outlet hole and the auxiliary sound leakage hole are located at the front side of the auricle of the wearer, and the main sound leakage hole is located at the rear side of the auricle of the wearer.

The invention relates to a loudspeaker and audio equipment and relates to the electroacoustic conversion technology field. The loudspeaker is mainly characterized in that the loudspeaker comprises a basin rack, a magnetic circuit system and a vibration system, wherein the basic rack has an accommodation space, the magnetic circuit system and the vibration system are respectively accommodated in the accommodation space of the basin rack, the magnetic circuit system is connected with the vibration system so as to drive the vibration system to vibrate and sound, and the magnetic circuit system is further driven by the vibration system to vibrate. The audio equipment comprises the loudspeaker. The loudspeaker is advantaged in that not only can low frequency sensitivity of the loudspeaker be improved as the volume of the loudspeaker is fixed, but also high-frequency sensitivity of the loudspeaker is guaranteed to be unchanged.

The invention provides a sound production device, which comprises a basin stand with an accommodating space, a vibration system accommodated in the accommodating space and a magnetic circuit system for driving the vibration system to vibrate and produce sound; the magnetic circuit system comprises a magnet yoke fixed on the basin stand; the vibration system comprises a first vibrating diaphragm for dividing the accommodating space into a front cavity and a rear cavity; the sound production device also comprises a dust cover which connects the basin frame and the magnet yoke. The dustproof cover divides the rear cavity into a first rear cavity close to the first vibrating diaphragm and a second rear cavity far away from the first vibrating diaphragm; the dustproof cover comprises a first fixing part fixedly connected with the basin stand, a second fixing part for fixing the magnet yoke, and a connecting part for connecting the first fixing part and the second fixing part. The connectingpart protrudes and extends towards the direction of the first vibrating diaphragm to form a protruding part. The dustproof cover of the sound production device can increase the volume of the rear cavity and increase the filling volume of the sound absorption particles.

The invention discloses a deep eddy current testing device based on a flux gate magnetometer and a use method. The deep eddy current testing device is mainly used for solving the problems of interlayer gaps existing in multilayer composite or forbidden use of a ultrasonic coupling agent that are adverse to ultrasonic testing in the prior art. The device comprises a gantry type measuring frame, wherein a fine tuning screw rod is arranged above the gantry type measuring frame; a probe is arranged on the flux gate magnetometer; an exciting coil is arranged under the probe; a two-dimension moving platform is arranged under the exciting coil; a signal generator generates a low frequency electromagnetic field in a certain amplitude through the exciting coil and generates eddy current in a sample; the flux gate magnetometer and the probe are used for measuring the magnetic field of the eddy current; and after a lock-in amplifier demodulates, a computer is used for collecting. According to the scheme, the deep eddy current testing device can be used for clearly distinguishing the defects in linear and crossing shape and realizing the nondestructive testing for the conductor joints. For the conditions of interlayer gaps existing in multilayer composite or forbidden use of a ultrasonic coupling agent for testing, the deep eddy current testing device has ultrahigh practical value and popularizing value.

The invention discloses an efficient high-performance moving-iron telephone receiver, which comprises an electromagnetic shielding shell, a diaphragm and a magnetic drive mechanism, wherein the diaphragm is fixed in an inner cavity of the electromagnetic shielding shell and is used for dividing the internal cavity of the electromagnetic shielding shell into a front cavity and a rear cavity; the magnetic drive mechanism comprises a connecting rod, a tongue, an iron edge, a magnet, a coil and a PCB board; a connecting rod hole is arranged at a non-end part of the diaphragm; one end of the connecting rod is connected to the tail end of a free end of the tongue and the other end of the connecting rod penetrates through the connecting rod hole and is connected to the diaphragm; a connecting position of the connecting rod and the diaphragm is not arranged on two ends of the diaphragm, the amplitude of the diaphragm is effectively improved under the same vibration amplitude of the tongue and the connecting rod, so that the output sensitivity and the efficiency of the telephone receiver are improved to help to reduce distortion of the moving-iron telephone receiver.

The invention provides a sound production device which comprises a vibration assembly and a magnetic circuit assembly, the vibration assembly comprises a diaphragm, the middle area of the magnetic circuit assembly is hollowed out to form an expansion cavity penetrating through the magnetic circuit assembly, and the area, located in the expansion cavity, of the magnetic circuit assembly is providedwith a flexible deformation part; the flexible deformation part covers the port of the capacity expansion cavity or divides the capacity expansion cavity into two mutually isolated partial areas; theflexible deformation part is arranged opposite to the vibrating diaphragm; the vibrating diaphragm comprises a vibrating diaphragm body part and a composite layer, the composite layer is combined inthe middle of the vibrating diaphragm body part, and the composite layer is provided with a connecting part which extends towards one side of the flexible deformation part and is connected with the flexible deformation part. And the flexible deformation part and the vibrating diaphragm vibrate synchronously. According to the sounding device, the equivalent volume of the rear vocal cavity of the sounding device is increased, and the low-frequency sensitivity of the sounding device is improved; and the polarization of the diaphragm can be suppressed.

The invention provides a loudspeaker inner core, which comprises a first frame, a first vibrating diaphragm and a first piezoelectric piece, wherein the first vibrating diaphragm comprises a middle part and an edge part surrounding the middle part; the edge part is mounted on the first frame; the first piezoelectric part is fixed on the surface, facing the first frame, of the middle part or the surface, deviating from the first frame, of the middle part; and the edge part is made of aluminum, aluminum magnesium alloy or magnesium aluminum alloy. When the loudspeaker inner core disclosed by the invention works, the edge part made of aluminum, aluminum-magnesium alloy or magnesium-aluminum alloy is moderate in rigidity and small in density, so that the vibration amplitude of the first vibrating diaphragm under the driving of the first piezoelectric piece can be effectively increased, the low-frequency sensitivity of the loudspeaker core is improved, the low-frequency frequency response of the loudspeaker core is improved, and the audio performance of the loudspeaker inner core is improved. The invention further provides a loudspeaker module and electronic equipment.

The invention discloses a compact moving-iron telephone receiver. The compact moving-iron telephone receiver comprises an electromagnetic shielding shell, a diaphragm, a coil and a PCB board. The compact moving-iron telephone receiver is characterized in that the electromagnetic shielding shell is composed of an upper cover and a lower cover which are buckled together. The diaphragm is fixed in the upper cover and is used for dividing the internal space of the electromagnetic shielding shell into a front cavity and a rear cavity. The space formed between the diaphragm and the top board of the upper cover is the front cavity. The residual space in the electromagnetic shielding shell is the rear cavity. The lengths of the rear ends of the upper cover and the lower cover are different. The rear ends of the upper cover and the lower cover are connected through a step surface. The PCB board is fixed on the step surface. The PCB board is moved out from the tail end of the product, and therefore, the internal space of the rear cavity is greater. Compared with the telephone receiver in the prior art, the compact moving-iron telephone receiver has the advantages that under the condition that the effective volumes of the rear cavities are the same, the external size of the product is enabled to be smaller, the telephone receiver can be applied to the smaller space, the application range is wide, and moreover, the quality of the telephone receiver is ensured.

The invention provides a loudspeaker module and an electronic product. The loudspeaker module comprises: a shell and a loudspeaker single body, wherein the loudspeaker single body is arranged in the shell and divides the shell into a front sound outlet area and a rear sound cavity; an acoustic pipeline, wherein the acoustic pipeline is provided with a sound inlet and a sound outlet, the sound inlet is communicated to the rear sound cavity, and the ratio L / S of the length L to the sectional area S of the acoustic pipeline is more than 1.6 / mm and less than 9 / mm; and a closed cavity, wherein thesound outlet of the acoustic pipeline is communicated with the closed cavity, and the sound transmitted from the sound outlet is closed in the closed cavity and is isolated from the sound transmittedfrom the front sound outlet area. The acoustic pipeline is arranged on the loudspeaker module, and the ratio of the length of the acoustic pipeline to the sectional area of the acoustic pipeline L / S is set to be greater than 1.6 / mm and less than 9 / mm, so that the resonant frequency of the loudspeaker module can be reduced, and the low-frequency sensitivity of the loudspeaker module below 500Hz canbe improved.

The invention relates to a piezoelectric transducer, a production method thereof, and electronic equipment. The piezoelectric transducer comprises a supporting structure and a piezoelectric vibratingdiaphragm arranged on the supporting structure; the piezoelectric vibrating diaphragm comprises a beam, one end of the beam in the first direction is supported by the supporting structure, and the other end of the beam is a free end; and the piezoelectric vibrating diaphragm comprises a first electrode layer and a piezoelectric material layer which are sequentially arranged on the supporting structure in a stacked mode, wherein the area of the piezoelectric material layer at the free end is smaller than that of the first electrode layer. Compared with a traditional piezoelectric transducer, the piezoelectric transducer, the piezoelectric transducer of the invention has the following advantages: when the piezoelectric vibrating diaphragm deforms, the bending stress is large; and particularly when the piezoelectric transducer is a piezoelectric electroacoustic transducer, the signal to noise ratio is high.

The invention provides an acoustic device which comprises a sound production unit, the sound production unit comprises a vibrating diaphragm, a first closed cavity is formed in the rear side of the vibrating diaphragm, a flexible deformation part is arranged on the cavity wall of the first closed cavity, a second closed cavity is formed in the outer side of the first closed cavity, and the flexible deformation part is located between the first closed cavity and the second closed cavity; the acoustic device further comprises an adsorption part located in the first closed cavity, and the adsorption part can increase the equivalent volume of the first closed cavity. The adsorption part is fixedly combined to the side, located in the first closed cavity, of the flexible deformation part, and the adsorption part and the flexible deformation part vibrate synchronously; and an avoiding space for avoiding the adsorption part is formed in the first closed cavity. The structure of combining theadsorption part on the flexible deformation part further improves the low-frequency sensitivity of the acoustic device, improves the frequency response of the intermediate frequency, and improves theacoustic performance.

Disclosed is an acoustic device, comprising a sound generating unit, a sound wave at a front side of the vibrating diaphragm radiates to outside through the sound outlet, a first sealed cavity is formed at a rear side of the vibrating diaphragm, a cavity wall of the first sealed cavity is provided with a mounting hole, a flexible deformation part is provided at the mounting hole, the second sealed cavity encloses a sound wave, in the second sealed cavity, a protective cover plate located at outside of the flexible deformation part is further provided on the mounting hole, and an escape space used for avoiding vibration of the flexible deformation part is formed between the protective cover plate and the flexible deformation part; air permeable micropores are provided on the protective cover plate, the air permeable micropores have an area less than or equal to 0.2 mm2.

The invention provides electronic equipment and a loudspeaker module thereof. The loudspeaker module comprises a shell, a sound production unit and a bass tube. The shell is provided with a containingcavity, a first sound outlet hole and a second sound outlet hole. The sound production unit is arranged in the accommodating cavity and divides the accommodating cavity into a sound guide front cavity and a coupling rear cavity, and the sound guide front cavity is communicated with the external space of the electronic equipment through the first sound outlet hole. The bass tube is arranged in thecoupling rear cavity and is communicated with the internal space of the electronic equipment through the second sound outlet hole. Therefore, the low-frequency sensitivity of the loudspeaker module can be improved, and the overall tone quality is further improved. Moreover, the working voltage required by the sounding unit to work under the maximum amplitude can be reduced, the performance requirement on the power amplifier is reduced, the power consumption of the electronic equipment is reduced, and the endurance time of the electronic equipment is prolonged. Besides, the amplitude of the loudspeaker module can be suppressed at the resonant frequency so that amplitude protection of the intelligent power amplifier is enabled not to be easily triggered in the frequency band, and the performance of the acoustic device can be better performed.

Disclosed by the present invention is an acoustic device, comprising a sound generating unit. A first sealed cavity is formed at the rear side of a vibrating diaphragm of the sound generating unit, a mounting hole is provided on a cavity wall of the first sealed cavity, and a flexible deformation part is provided on the mounting hole. A second sealed cavity is formed at the outer side of the first sealed cavity, and the second sealed cavity encloses the sound wave generated during deformation of the flexible deformation part therein. The mounting hole is located on the first wall, and a groove is provided on the first wall at the periphery of the mounting hole towards the first sealed cavity. The flexible deformation part is fixed on the bottom of the groove, and a through groove is further provided on the first wall.

An acoustic device comprises a sound generating unit having a vibration diaphragm, the acoustic device is provided with a sound outlet, the sound waves at a front side of the vibration diaphragm radiates to the outside through the sound outlet; and an enclosed closed cavity formed at a rear side of the vibration diaphragm, the closed cavity is divided into first and second closed cavities by a partition part, and at least a portion of the partition part flexibly deforms, the first closed cavity is adjacent to the vibration diaphragm, the second closed cavity is far away from the vibration diaphragm, the volume of the second closed cavity is larger than that of the first closed cavity; the second closed cavity encloses the sound into the second closed cavity; at least a part of an electronic apparatus housing is used for forming the first and / or the second closed cavity.

The invention discloses a gas absorbing material block, which comprises a main body structure formed by a zeolitic material bonded by a binder, and a plurality of cavitation bubbles randomly distributed in the main body structure, wherein the cavitation bubbles are obtained by decomposing a foaming agent or a pore-forming agent.

The present invention provides a sound-generating device, comprising a basin frame with a receiving space, a vibration system received in the receiving space, and a magnetic circuit system for driving the vibration system to vibrate and sound, the magnetic circuit system comprising a The magnetic yoke of the basin frame; the vibration system includes a first diaphragm that divides the accommodation space into a front cavity and a rear cavity; the sound-emitting device further includes a dust cover connecting the basin frame and the magnetic yoke, the The dust cover divides the rear cavity into a first rear cavity close to the first diaphragm and a second rear cavity far away from the first diaphragm, and the dust cover includes a fixed connection with the basin frame The first fixing part, the second fixing part fixing the yoke, and the connecting part connecting the first fixing part and the second fixing part, the connecting part is convex and extends toward the first diaphragm to form a convex start. The dust cover of the sound-emitting device can increase the volume of the back cavity and increase the filling volume of the sound-absorbing particles.