31results about How to "Good high frequency performance" patented technology

The invention discloses a preparation method for electromagnetic wave interference resistant iron silicon aluminum nickel alloys. The invention comprises the following steps: firstly, ferrum, aluminum, silicon and nickel with a purity more than 99.9 weight percent are taken as raw materials and laid into a medium frequency vacuum induction furnace for smelting, and a master alloy is obtained; secondly, the master alloy after smelting is laid into a quick quenching device; an alloy ingot casting is quickly poured on a water-cooling roll wheel which rotates at high speed after arc remelting under the protection of high purity inert gases, and a quickly condensed sheet band or a quickly condensed sheet is obtained; thirdly, the sheet band or the sheet is laid into a ball mill for ball milling flat processing, and flat powder is obtained; fourthly, the flat powder is laid into a stainless steel tube which is then vacuumized and filled with high purity inert gases for protection, and then the stainless steel tube is laid into a tube furnace for heating, heat preservation and cooling along with the furnace; fifthly, the flat powder and binding agents are mixed and milled for processing the sheet. The preparation method for the electromagnetic wave interference resistant iron silicon aluminum nickel alloys adds adequate nickel into Sendust alloys, thereby the processability of the alloys is improved; the ball milling time is reduced; the cost of industrial production is saved; simultaneously the magnetic conductivity can be improved and the magnetic shielding effect can be improved.

The invention discloses a 12-bit high speed streamline analog-to-digital converter with a background calibration function. The 12-bit high speed streamline analog-to-digital converter with a background calibration function utilizes a sample hold circuit structure without a front end and the whole streamline has five levels, wherein the first streamline level is 3.5-bit; the second streamline level to the fourth streamline level are 2.5-bit; and the fifth streamline level is 3-bit flash ADC. The 12-bit high speed streamline analog-to-digital converter with a background calibration function is featured in that in the streamline, the first streamline level utilizes a 3.5-bit MDAC structure with overflow bit and is integrated with a sampling time deviation calibration module which is used for realizing correction of the sampling time deviation of two sampling networks including an MDAC and a sub ADC; besides, the analog-to-digital converter also includes a reference voltage generation circuit which is used for providing stable reference voltage for each streamline level, a clock generation circuit which is used for providing a accurate clock for each streamline level, and a redundancy correction circuit for misalignment addition of output coding. The 12-bit high speed streamline analog-to-digital converter with a background calibration function of the invention has the advantages of being low in power consumption, and being able to realize high speed application when the process size is small.

The invention relates to a heat resistant alcohol-soluble self-bonding paint used for self-bonding insulated winding wire and manufacturing method thereof. The self-bonding paint contains the following components by weight percent: 35-45% of cresol, 35-45% of dimethylbenzene, 5-20% of H2 nylon, 3-7% of Es-7 nylon, 0.1-1% of AS resin, 0.1-2% of E51 epoxy resin and 0.01-0.1% of 594 curing agent. Compared with the prior art, the invention is simple in technology, the heat resistant alcohol-soluble self-bonding paint obtained by adopting the invention is coated outside a three-layer insulated winding wire to form a self-bonding three-layer insulated winding wire, and unframed coil formed by the winding wire has high withstand voltage and good high frequency performance and accords with the development trend of the current information industry.

The invention relates to a low-temperature co-fired ceramic common mode filter for eliminating signal interference on an electronic apparatus. A sheet type low-temperature co-fired ceramic common mode filter produces a low-temperature co-fired ceramic by laminating tape-casted unripe ceramic tapes, n layers of left coils and right coils are printed in the low-temperature co-fired ceramic, where n>=5, an n-th layer and a first layer are pin layers respectively; the filter is characterised in that: a joint heat of a left coil's end of a lower layer and a right coil's end of an upper layer is stagger with a joint head of a left coil's end of the upper layer and a right coil's end of a more upper layer, and a joint heat of the other end of a right coil of the lower layer and the other end of the left coil of the upper layer is stagger with a joint heat of the other end of a right coil of the upper layer and the other end of the left coil of the more upper layer. The invention has characteristic of more ideal high-frequency performance, low differential mode impedance and low manufacturing cost.

The invention relates to an electronic component, and more specifically relates to a radio frequency input socket which can be used to block direct-current signals and low-frequency signals and make radio frequency signals pass through. The tuner isolation input socket is characterized in that the radio frequency input socket is fixed on a main circuit board, the ground plane of the radio frequency input socket and the ground plane of the main circuit board are provided with a capacitor therebetween; or the radio frequency input socket is fixed on a circuit board, the circuit board is provided with wire routing and a capacitor, a shielding case is fixed on the circuit board at the same time, and the ground plane of the radio frequency socket is connected with the shielding case through the wire routing and the capacitor on the circuit board. The tuner isolation input socket provided by the invention has the advantages of low cost, good high-frequency performance, complete shielding and simple assembly process, and solves the technical problem that an existing radio frequency input socket in the prior art is complex in structure and assembly process, high in required accuracy, low in production efficiency and high in cost.

The invention relates to a strip-shaped loudspeaker box with mirror image type low-frequency radiators. A box body is in a long flat strip shape. Low-frequency radiator installation holes symmetrical in position are formed in the upper and lower surfaces of the right half part, in the long axis direction, of the box body respectively, and the two low-frequency radiators are correspondingly installed in the two upper and lower low-frequency radiator installation holes in a mirror symmetry mode. A mid-low-pitch loudspeaker installation hole is formed in the left half part, in the long axis direction, of the box body, a mid-low-pitch loudspeaker is installed in the mid-low-pitch loudspeaker installation hole, and the mid-low-sound loudspeaker radiates sounds towards the part over the box body. A high-pitch loudspeaker installation table is arranged on the front side face of the left end, in the long axis direction, of the box body, a high-pitch loudspeaker is installed on the high-pitch loudspeaker installation table, and the high-pitch loudspeaker radiates sounds towards the part right ahead of the box body. The strip-shaped loudspeaker box has the acoustic properties of being small in distortion, good in low frequency, capable of bearing high power and excellent in high-frequency performance; the transient stability of the loudspeaker box can be improved, and thus the loudspeaker box can achieve a good sound effect when radiating low-frequency sounds.

The invention discloses a method for preparing an oxygen-containing soft magnetic thin strip for high frequency, which is characterized by comprising the following steps: A. adopting an intermediate frequency induction heating method to prepare a FexMyBmOn master alloy, wherein M is selected from Zr, Nb, Ti, V , one of Cr, 55≤x≤65, 10≤y≤20, 5≤m≤10, 10≤n≤30; B. Cut the master alloy into blocks, and encapsulate it into an oxidized quartz glass tube. In the zirconium crucible, vacuum treatment is carried out; C. Use medium frequency induction to heat the master alloy in the quartz tube, after the alloy is completely melted, pass argon gas into the quartz tube, and spray the FexMyBmOn thin strip by the method of single-roller melt spinning ; D. Stress relief annealing for thin strips. By adopting the process method of the present invention, the iron-based soft magnetic thin strip with excellent high-frequency performance is obtained, the process is greatly simplified, the cost is reduced, and the mass production and application promotion are facilitated.

The invention discloses a composite amorphous magnetically soft alloy having high initial permeability and high quality factor. The alloy comprises components of Fe69.21Co7.69Cu0.6Nb2.5Si11B9-Ni71P29. A preparation method comprises the following steps: firstly, an amorphous magnetically soft alloy thin strip is prepared; then, chemical nickel-phosphorus plating liquid is prepared; and the composite amorphous magnetically soft alloy is prepared by a chemical deposition method. The composite amorphous magnetically soft alloy has the following advantages: the composite amorphous magnetically soft alloy prepared through the chemical deposition method is excellent in high-frequency performance; the relaxation frequency is high up to 3.8 MHz; the quality factor is 41 under the condition of 1 MHz; the initial permeability is kept at 6000 under the conditions of frequency of 1 kHz-1 MHz and magnetic field of 0.05 A/m, and is basically invariable; and the composite amorphous magnetically soft alloy is simple in process, convenient to operate, low in cost and suitable for large-scale industrial production.

The invention relates to a sound box based on an oppositely buckled passive radiator. The sound box comprises a prolate box body, a high pitch loudspeaker mounting hole and a mid-bass loudspeaker mounting hole distributed along the length direction of the box body are opened in the top of the box body, a high pitch loudspeaker unit is mounted in the high pitch loudspeaker mounting hole, and a mid-bass loudspeaker unit is mounted in the mid-bass loudspeaker mounting hole; a passive radiator unit is mounted on the right side of the mid-bass loudspeaker unit through a radiator bracket, and the central axial line of the passive radiator unit is mutually parallel to the central axial lines of the high pitch loudspeaker unit and the mid-bass loudspeaker unit; the radiator bracket is provided with two sound outlets which are symmetrically arranged at 180 degrees, the two sound outlets respectively face to front and back side faces of the box body, and sound outlet holes communicated with the sound outlets are respectively formed in the front and back side faces of the box body. The sound box provided by the invention both has the advantages of the passive radiator sound box and can perfect the defects of poor vertical transient stability, high cut-off frequency and large total loss Ql value, so as to ensure a good sound effect for the sound box.

The invention relates to a non-inductive capacitor. The non-inductive capacitor comprises an aluminum housing and a capacity element, wherein film bodies are arranged between the aluminum housing and the capacity element; a lead wire is arranged in a core rod in the middle of the capacity element; an anti-explosion end cap is arranged at the upper end of the aluminum housing; the edge of the anti-explosion end cap is sealed along the aluminum housing in a tight curling manner; soldering lugs are arranged on the outer side of the anti-explosion end cap and are sealed by plastic sheaths; an anti-explosion piece is arranged on the inner side of the anti-explosion end cap; a fixed bridge is arranged between the anti-explosion piece and the anti-explosion end cap; copper foils are arranged on the lower side of the anti-explosion piece; solid rivets penetrate through the anti-explosion piece; one ends of the solid rivets are in spot welding with the upper ends of the copper foils; the other ends of the solid rivets penetrate through the fixed bridge and the anti-explosion end cap; the lower end of one copper foil is welded with the upper end of the lead wire. The non-inductive capacitor is characterized in that the upper and lower ends of the capacity element take the shape of a sinusoidal wave respectively; the edges of the upper and lower ends of the capacity element are sprayed with zinc coatings. According to the non-inductive capacitor, the contact areas of the capacity element and the zinc coatings can be enlarged; an equivalent series resistance is reduced; the heating is reduced; the high frequency performance is more excellent; the service life is longer.

The invention discloses a sound generation device. The sound generation device comprises a magnetic circuit system configured to be used for forming a magnetic field; and a vibration system, wherein the vibration system comprises a voice coil, a vibration diaphragm and a reinforcing layer; one end of the voice coil is connected with a center part of the vibration diaphragm, and the other end is located in the magnetic field; the reinforcing layer is arranged at the center part, the reinforcing layer comprises a carbon fiber prepreg layer, and an oriented angle of the graphite microcrystal of the carbon fiber in the carbon fiber prepreg layer is less than or equal to 30 DEGC, and the oriented angle is the included angle of the graphite microcrystal and a fiber axis.

The invention discloses a current-type grid multi-scroll chaotic circuit, which comprises three current integrators, a current inverting amplifier and two current mode step wave sequence generation circuits, wherein the three current integrators are serially connected in sequence; the input end of the current inverting amplifier is connected with the output ends of the three current integrators and the output ends of the two current mode step wave sequence generation circuits; the output end of the second current integrator is connected with the input end of the second current mode step wave sequence generation circuit; the output end of the second current mode step wave sequence generation circuit is connected with the input end of the third current integrator; and the output end of the third current integrator is connected with the input end of the first current mode step wave sequence generation circuit. Current signals are adopted as state variables for the circuit, the state variables are directly outputted from the high-impedance end of the current integrator, a load can be directly driven without a buffer, the high-frequency performance is good, and high-frequency multi-scroll chaotic attractors can be generated.

The invention discloses a netty anti-explosion gradual-change sheet resistance metalized safety film for a capacitor. The film comprises a polypropylene film dielectric layer and two metalized film layers plated on the polypropylene film dielectric layer in an evaporation way through uniformly mixed zinc aluminum, wherein the metalized film layers adopt netty structures and are segmented into conductive metal grids by X-shaped plating-free regions; the adjacent X-shaped plating-free regions are disconnected by micro fuses formed by the metalized film layers subjected to the evaporation plating; and the conductive metal grids are connected by the micro fuses. The film has the beneficial effects that the capacitor is high in voltage increment rate, high in high-frequency performance and high in energy storage density, and has very high sensitivity when being passed by a high current; and a self-recovery breakdown part can be effectively isolated during self recovery, so that other parts are prevented from being influenced, the internal safety quality of the whole dry anti-explosion capacitor is ensured, the capacitor is sensitive in response, reliable in self recovery and high in anti-explosion safety performance, and the problems of easy combustion and explosion, poor quality, low reliability, short service life and the like of an existing capacitor product are solved.

The invention discloses a nanocrystalline alloy magnetic core and a preparation method thereof. According to the nanocrystalline alloy magnetic core provided by the invention, multi-field coupling heat treatment is carried out on a quenched alloy material to obtain the nanocrystalline alloy magnetic core, wherein the quenched alloy material comprises at least one of a compound with the chemical formula as shown in formula I. The nanocrystalline alloy magnetic core has high relaxation frequency and low high-frequency loss. According to the invention, the high-frequency characteristic of the nanocrystalline magnetic core is realized through multi-field coupling of the heat field, the magnetic field and the stress field and real-time relegation and control, so that the relaxation frequency ofthe nanocrystalline alloy magnetic core is improved and the high-frequency loss is reduced.

The invention provides a transverse double-diffused metal oxide semiconductor device and an electronic device. The semiconductor device comprises a substrate; and a source region and a drain region, and the source region and the drain region are located in the substrate, wherein a source and a drain are formed on the surface of the substrate on the source region and the drain region, respectively,and a schottky diode is formed between the source and the drain. The drift extension in the off state is depleted by the body region and the device operates as a conventional LDMOS. When the device is switched on or switched off, the schottky diode is switched on or switched off more quickly and is turned on earlier to improve high frequency performance.

The invention discloses a non-oriented electrician steel thin strip and a production method thereof. The non-oriented electrician steel thin strip is prepared from the following chemical components inpercentage by weight: 0.0020 to 0.0030% of C (carbon), 3.0 to 3.20% of Si (silicon), 0.15 to 0.25% of Mn (manganese), 0.0006 to 0.0010% of S (sulfur), 1 to 1.5% of Al (aluminum), 0.0015 to 0.0025% ofN (nitrogen), 0.008 to 0.012% of Sn (selenium), and the balance of Fe (iron) and unavoidable impurities. The production method comprises the following steps of normalizing and pickling, and cold-rolling into 0.27mm and 0.20mm products, so as to obtain rolled hard coils.

The invention discloses a sounding device. The sounding device includes: a magnetic circuit system configured to form a magnetic field; and a vibration system including a voice coil, a diaphragm, anda reinforcing layer, wherein one end of the voice coil is connected to the central portion of the diaphragm; the other end of the voice coil is located in the magnetic field; the reinforcing layer isdisposed at the central portion; the reinforcing layer includes a carbon fiber prepreg layer; and carbon fibers in the carbon fiber prepreg layer have diameters less than or equal to 7 [mu]m; and thecarbon fibers in the same layer are unidirectional and arranged side by side.

The invention relates to an isolator which obstructs DC signals and low-frequency signals and allows passing of radio frequency signals. The ground current isolator of the radio frequency signals comprises a first coaxial connector and a second coaxial connector which are connected with each other. A first insulator of the first coaxial connector is located in a first shielding layer, and a second insulator of the second coaxial connector is located in a second shielding layer. One end of the second shielding layer has an intersected superposed segment with the first shielding layer. The superposed segment between the first shielding layer and the second shielding layer is provided with a clearance which is internally provided with a conductive medium layer. The ground current isolator for the radio frequency signals provided by the invention is simple in structure simple in assembly process, high in production efficiency and low in cost. The ground current isolator settles the technical problems in the prior-art isolator such as complicated structure, difficult assembling process, high precision requirement, low production efficiency and higher cost.

The invention discloses a multistage tuning earphone and audio-visual equipment, and relates to the technical field of earphones. The multistage tuning earphone comprises an earphone body and a tuningcylinder. A loudspeaker single body is arranged in the earphone body. The loudspeaker single body divides the internal space of the earphone body into a rear cavity and a front cavity. The earphone body is provided with a rear cavity air leakage hole communicated with the rear cavity. The tuning cylinder is rotatably arranged on the earphone body. The tuning cylinder is provided with a cylinder inner cavity, a cylinder wall hole communicated with the cylinder inner cavity is formed in the cylinder wall of the tuning cylinder, when the tuning cylinder rotates to a first state relative to the earphone body, the cylinder wall of the tuning cylinder seals the rear cavity air leakage hole, and when the tuning cylinder rotates to a second state relative to the earphone body, the cylinder wall hole is communicated with the rear cavity air leakage hole. The multistage tuning earphone provided by the invention can adjust the high and low frequency performance according to the listened sound, thereby improving the listening experience of a user.

The invention provides a series connection type unilateral elliptic function transmission line filter. A distributed parameter network is composed of an input transmission line, an output transmission line, series connection cross joints, short circuit transmission line branch joints, a cascading transmission line joint, a series connection transmission line joint and other transmission line elements. The first series connection cross joint (2) and the second series connection cross joint (7) are arranged oppositely, opposite ports of the first series connection cross joint (2) and the second series connection cross joint (7) are connected through the cascading transmission line joint (3), ports in the same sides of the series connection cross joint (2) and the second series connection cross joint (7) are connected through the series connection transmission line joint (4), another two ports of the first series connection cross joint (2) are connected with the input transmission line (1) and the first short circuit transmission line branch joint (5) respectively, and another two ports of the second series connection cross joint (7) are connected with the output transmission line (8) and the second short circuit transmission line branch joint (6) respectively. All transmission line element parameters in the filter are appropriately designed, so that transmission characteristics of a unilateral elliptic function are achieved. The filter is suitable for bandwidths below the medium degree of microwave and millimeter wave frequency bands, low in loss, and high in selectivity.

The invention relates to an electric connector arranged on a mother-circuit board, comprising an insulation body, a lingual plate and a metal shell, wherein the lingual plate is arranged on the insulation body; the metal shell encircles the periphery of the insulation body; the lingual plate is a circuit board which is provided with a plurality of metal gaskets; the rear end of the insulation body is provided with a plurality of conductive terminals; and one ends of the conductive terminals are welded on the circuit board, and the other ends of the same are welded on the mother-circuit board. Therefore the electric connector is convenient to assemble, saves the cost by substituting partial conductive terminals by the metal gaskets and has good high-frequency property and high strength of products.

The invention relates to a virtual seven-channel strip sound box. A left-end-arranged loudspeaker is arranged on the left end face of a strip box body; a right-end-arranged loudspeaker is mounted on the right end face of the strip box body; the left-end-arranged loudspeaker and the right-end-arranged loudspeaker are symmetrical to each other in a mirrored manner; a left-front-arranged loudspeaker, a middle-front-arranged loudspeaker and a right-front-arranged loudspeaker are mounted on the front lateral surface of the strip box body; the middle-front-arranged loudspeaker is positioned at the middle position of the strip box body in the long axis direction; the left-front-arranged loudspeaker and the right-front-arranged loudspeaker are symmetrically arranged at both left and right sides of the middle-front-arranged loudspeaker; a left-top-arranged loudspeaker and a right-top-arranged loudspeaker which are bilaterally symmetrical are mounted at the top of the strip box body; a projection position of the left-top-arranged loudspeaker on a plane is positioned between the left-front-arranged loudspeaker and the middle-front-arranged loudspeaker; and a projection position of the right-top-arranged loudspeaker on the plane is positioned between the middle-front-arranged loudspeaker and the right-front-arranged loudspeaker. The virtual seven-channel strip sound box disclosed by the invention can achieve a stereoscopic surrounding effect, improves transient stability of a sound system, and is low in distortion, good in low frequency and high in bearable power.

The invention discloses a hybrid loudspeaker monomer and a loudspeaker module. The monomer comprises a moving coil sound production unit and a moving iron sound production unit, wherein the moving coil sound production unit comprises a vibration system and a first magnetic path system matched with the vibration system; the vibration system comprises a vibrating diaphragm; the first magnetic path system comprises T-iron; a holding cavity is formed in a core column of the T-iron; the moving iron sound production unit comprises a second magnetic path system, a transmission rod and a diaphragm; the second magnetic path system is arranged in the holding cavity; one end of the transmission rod is connected with the second magnetic path system and the other end is connected with the diaphragm, and the diaphragm is connected with the vibrating diaphragm. The loudspeaker module comprises the hybrid loudspeaker monomer provided by the invention.

The invention discloses a packaging structure and an optical module. The packaging structure comprises a packaging substrate, at least one semiconductor laser chip, at least one sub-substrate and a matching circuit, wherein the semiconductor laser chip and the sub-substrate are arranged on the packaging substrate, and at least part of the matching circuit is arranged on the sub-substrate; the semiconductor laser chip is provided with a signal electrode, the packaging substrate is provided with grounding metal and at least one signal line, and the at least one signal line is electrically connected with the signal electrode of the laser chip; the matching circuit comprises an input end, at least one electronic element and a grounding end; and the input end is electrically connected with the signal electrode of the laser chip, the two ends of at least one electronic element are electrically connected with the input end and the grounding end respectively, and the grounding end is electrically connected with the grounding metal of the packaging substrate. The sub-substrate is additionally arranged on the packaging substrate and used for designing laser matching circuits such as an RC circuit, so that coupling between a matching resistor and the GND and coupling between a filtering capacitor and the GND are reduced, the photoelectric bandwidth is improved, and good high-frequency performance is achieved.

The invention provides a railway digital train tail loop antenna and a manufacturing method thereof. The loop antenna comprises a housing, a coil assembly arranged in the housing and a tuning matchingdevice. A silk-covered wire in the coil assembly is wound around the loop outer surface of a loop inner fixation frame to form an inner coil, and is led to and wound around the loop outer surface ofa loop outer fixation frame to form an outer coil. The loop inner fixation frame and the loop outer fixation frame are stacked together and are glued together by a plurality of electrical adhesive tapes to make the inner coil and the outer coil become one body. A start wire of the inner coil of the silk-covered wire is connected with a radio frequency positive end of the tuning matching device; anend wire of the outer coil of the silk-covered wire is connected with a capacitor array in the tuning matching device; and the capacitor array is connected to a radio frequency negative end. Throughdouble-layer multi-strand winding of the silk-covered wire and superposition of inner and outer coils, and through paint dipping processing during manufacturing, the size and volume of the antenna canbe greatly reduced.

The invention provides an anti-impulse tensile high frequency enamelled winding wire characterized by comprising metal wire cores and a polyester protection layer; a number of the metal wire cores are intertwisted into a bundle on an outer side of which the polyester protection layer is coated; or a number of the metal wire cores are intertwisted into a group which forms an enamelled wire primary group, a number of enamelled wire primary groups are intertwisted into a bundle on an outer side of which the polyester protection layer is coated; a polyamide-imide coating layer is coated on an outer side of the polyester protection layer. Compared with technologies of the prior art, the anti-impulse tensile high frequency enamelled winding wire is markedly advantageous in that when the anti-impulse tensile high frequency enamelled winding wire is applied to a large power and high frequency filtering inductor or a high frequency and high voltage transformer, high frequency performance can be realized, power consumption can be lowered, and energy can be saved by more than 20%; the anti-impulse tensile high frequency enamelled winding wire is high in flexibility, ductility and pull resistance.

The invention relates to isolation amplifiers, proportional controlled sources and integral controlled sources with the isolation amplifiers, and a mutual coupler, and belongs to a circuit, electroniccircuit and analog signal processing device. The isolation amplifiers are each composed of two diode or audion receiving-type photoelectric couplers with the same parameters, are each of a complimentary symmetry structure, and have excellent characteristics of direct current signal amplifying, high isolation property, alternate current signal positive and negative symmetry and quick response; theproportional controlled sources and the integral controlled sources are composed of the isolation amplifiers and operational amplifiers, and central core circuits are in mirror symmetry and have thehigh isolating property, the high linearity degree, the high operational precision and ideal input and output characteristics of the controlled sources; the mutual coupler is composed of the controlled sources and has excellent properties because of the complimentary symmetry structure of the isolation amplifiers and the mirror symmetry structure of the controlled sources, and thus the various transformation functions can be achieved; and the proportional controlled sources, the integral controlled sources and the mutual coupler are applied to single-phase, two-phase and three-phase circuits,and the rich functions of isolation, control, operation, transformation and the like are achieved.

The invention relates to a vehicle-mounted camera outer shell structure with good shielding performance. The vehicle-mounted camera outer shell structure comprises an outer shell body, a plate end connector, an external connector and a shielding plate. The shielding plate is transversely arranged in the cavity of the shell body. The external connector comprises a wiring terminal, an insulating column and a metal shell which are sequentially sleeved from inside to outside in the radial direction of the external connector. The metal shell is inserted and fixed on the shell body and passes through the shielding plate for a set distance. The plate end connector is arranged in the cavity of the shell body and is inserted into the external connector. The shielding plate is electrically connectedwith the metal shell. By adopting the technical scheme for setting, the vehicle-mounted camera has shielding performance, so that the influence of external electromagnetic interference on a signal transmission process is effectively reduced, the reliability and stability of signal transmission are ensured, and the vehicle-mounted camera has excellent high-frequency performance.

A manufacturing method of a diamond like carbon vibrating diaphragm of the present invention comprises a step of placing a base material in the air, wherein the base material is a high polymer material. A step of depositing the diamond like carbon vibrating diaphragm comprises on a temperature condition of less than 90 DEG C, importing a carbon-containing gas from one end of an atmospheric pressure plasma chemical vapor deposition device, and providing a voltage more than 5 kV and less than 10 kV to ionize the carbon-containing gas, importing a main gas from the other end of the atmospheric pressure plasma chemical vapor deposition device, bringing out the ionized carbon-containing gas out of the atmospheric pressure plasma chemical vapor deposition device by the main gas and depositing on the surface of the base material to form the diamond like carbon vibrating diaphragm. A step of forming the diamond like carbon vibrating diaphragm comprises cutting the diamond like carbon vibrating diaphragm having the needed diameter from the diamond like carbon vibrating diaphragm, forming the diamond like carbon vibrating diaphragm having the needed shape by a compressing technology; or compressing on the diamond like carbon vibrating diaphragm by the compressing technology to form the diamond like carbon vibrating diaphragm having the needed shape and diameter, and cutting the diamond like carbon vibrating diaphragm. Compared with the conventional manufacturing method of the plasma enhanced chemical vapor deposition and the physical vapor deposition, the manufacturing method of the diamond like carbon vibrating diaphragm of the present invention can deposit the diamond like carbon vibrating diaphragm in the atmospheric pressure and low temperature environments without needing to setting a vacuum cavity and a vacuum device, and enables the processes to be simplified. Moreover, in the low temperature environment, the diaphragm break caused by the high temperature or the diaphragm wrinkling caused by the thermal deformation can be avoided, and the formed diamond like carbon vibrating diaphragm is more flat.

The invention discloses a piezoelectric vibrating diaphragm and a piezoelectric loudspeaker, and belongs to the technical field of loudspeakers. The vibrating diaphragm comprises a substrate, piezoelectric ceramic, and a composite base material, wherein the base plate is fixed on the base plate through fixing glue; the plurality of piezoelectric ceramics comprise central piezoelectric ceramics anda plurality of annular piezoelectric ceramics; the plurality of annular piezoelectric ceramics are annular and are arranged around the central piezoelectric ceramic; the multiple annular piezoelectric ceramics are arranged in the direction from the center of the substrate to the edge, the deformation direction of the annular piezoelectric ceramics adjacent to the center piezoelectric ceramic is opposite to the deformation direction of the center piezoelectric ceramic, and the deformation directions of every two adjacent annular piezoelectric ceramics are opposite. The composite base materialis adhered to the central piezoelectric ceramic and the plurality of annular piezoelectric ceramics through a conductive adhesive. The piezoelectric vibrating diaphragm and the piezoelectric loudspeaker provided by the invention can have better high-frequency performance, reflect on a frequency response curve, can be smoother on a high-frequency-band frequency response curve, and have no more obvious wave crests and wave troughs.