CN1812659B - Internal and external double-magnetic hollow magnetic core type loudspeaker and power amplification and control circuit - Google Patents

Abstract

A loudspeaker of hollow magnetic core type with internal and external magnetism is composed of loudspeaker and its audio control switch, stopping and audio output capacitor, diode, power amplifier tube with its collector and emitter as well as base resistor, input control switch of audio signal and input capacitor of audio signal .It features that the mode of said loudspeaker or receiver can be switched over freely.

Description

Inner and outer double-magnetic hollow magnetic-core type loudspeaker and power amplifier and control circuit

Because of the telephone set of the convenience of telephone set hand-free function, production and marketing manufacturer production and marketing at present all is with hand-free function basically, simultaneously, be receiver for different needs such as maintain secrecy must keep the sounding components and parts again.Traditional hand-free function mainly is to realize with corresponding power driving amplifier by installing sounding components and parts loud speaker additional, this has just increased loud speaker and weight thereof and its shared area and volume inevitably, equally also make machine volume inevitably, weight, (fact all proves with experience reliability repeatedly: under the identical prerequisite of other condition, failure rate often always becomes high-positive correlation with the number of component number) and design and the corresponding increase with difficulty of manufacturing cost, especially in the face of more and more miniaturization, ultra-thinization, the development of ultralightization and consumer market demand general trend then more demonstrate most important property such as its market competitiveness height.Receiver generally all is that impedance is very high for loud speaker, the sounding components and parts that power is very little, therefore it is difficult to replace loud speaker and function thereof, and because of the impedance height carefully makes the D.C. resistance of its coil very big with line, adding because of high impedance makes power output very low, these factors add makes its power consumption and heating also just inevitable equally very big together, so its energy utilization efficiency is very low, especially for being extensive use of, the mobile phone that quantity is extremely huge and other audio communication equipment, energy utilization efficiency is low just to be meaned must strengthen and transmits and receives power, and this just increases amount of electromagnetic radiation inevitably, particularly to the bigger electromagnetic radiation intensity of human body harm; There is a kind of wide-spread and what is called of using to replace the receiver of nearly body to reach reducing IVR equipment to comprise that mobile phone is the amount of radiation of mobile phone and intensity and to the extent of injury of human body with ear (plug) machine, actually this is not so, this way only can be strengthened but not weaken electromagnetic pollution and harm to human body and surrounding enviroment, because connect between the resistance of the electric wire of earphone and earphone voice coil loudspeaker voice coil winding and they, comprise and this machine between distributed capacitance (amount) between formed mutually one and/or a plurality of new be equivalent to the capacitance-resistance coupling and with the electromagnetic wave repeat transmitted and the receiver of induction type, promptly this moment, earphone and on line thereof were served as the antenna of strengthening propagating electromagnetic radiation, and it is more much longer than airborne antenna, the scope of laying is much also wide, the scope and the intensity of electromagnetic radiation has just been strengthened in the stack of these factors greatly, and the harm nature is just bigger wider than nearly body earphone; Also has a kind of same wide-spread and use, even ratio increase earphone is exactly to increase so-called radiation proof pad pasting to reach the electromagnetic radiation and harm purpose that weakens audio communication equipment such as mobile phone widely, this also is a kind of real erroneous tendancy that can realize that is difficult in fact, because detecting, many authoritys fact proved that most so-called radiation proof pad pastings or other so-called protection film substantially do not possess radiation protection ability, seldom even at all can not alleviate any radiation and energy thereof, even so, even if very can effectively alleviate radiation and harm, also transmitting and receiving signal strength signal intensity with sacrifice is cost, because can alleviate the means of radiation intensity mainly is nothing but shielding electromagnetic wave, this just must cause transmitting and receiving power with increasing is that cost is offset diaphragm to shielding electromagnetic waves, can't help consuming energy more, and the amount of electromagnetic radiation and the intensity that also can positive correlation ground increase human body because of the increase of amount of electromagnetic radiation and intensity are the extent of injury, also the increase because of power is significantly shortened battery life, the time that use each charging back also significantly shortens, even if reduce emission and received power to reduce electromagnetic hazard and pollution and battery consumption to improve directivity (the radio wave directivity is very strong), but this just makes that wireless audio communication device orientation is extremely strong, speech quality such as sound are suddenly big or suddenly small, smudgy, intermittent even conversation fault waits as broken string repeatedly functional reliability and other performance is greatly reduced, solution remain add high-power, so its harmful consequences is basic identical, and these factors also all can have a strong impact on the product market competition ability and serious increasing because of battery scrapped the increase of the environmental pollution that produces and use cost such as accelerating (battery of mobile phone is generally all more expensive, tens of at least even up to a hundred yuans); Increase loud speaker and can effectively reduce the electromagnetic radiation and the harm of and surrounding enviroment next to the shin, but have aforesaid such as increasing not enough problems such as components and parts and volume thereof, area, weight, cost to human body because of answering to die with respect to the remote-wireless that receiver is sayed.Obviously, innovation sounding components and parts that the low radiation hazard of the confidentiality of receiver and loud speaker if can be combined and be equipped with innovation and can (easily) control drive power amplifier, then it can not only effectively overcome the serial shortcoming of above-mentioned prior art and product, and its serial main advantages is that advantages such as the market share all are conspicuous all will finally be embodied in the market competitiveness especially.

Total be exactly inner and outer double-magnetic hollow magnetic-core type loudspeaker and power amplifier and control circuit that the present invention designs for the serial problem that solves prior art and product for one goal of the invention, existing principle, scheme and major advantage are continued to introduce as after.The present invention directly utilizes receiver and the position that is had thereof, volume, area, weight with it, and get rid of and decide circle and vibrating diaphragm and iron core, change so that the vibrating diaphragm of direct sounding is integrated respectively but wire circle seldom is moving-coil and strong magnetic permanent-magnet alloy replaces, resistance is big by the superfine number of turns in line footpath is a lot of to change receiver, power consumption and heat production are all more decide circle generate an electromagnetic field earlier and magnetize iron core, the indirect sounding of vibrating diaphragm is inhaled, put to the suction, the thrust that are produced by the iron core after the magnetization again operation principle and pattern; Big and the little tonequality of integrated distortion is more true to nature and sensitivity is higher because of the moving-coil space, the number of turns few and easily increase line directly thus the resistance energy consumption and the heating littler, but it can bear and export very big audio power, not only solved receiver and decided circle little such as power, the energy consumption height, serious distortion even hoarse unpleasant to hear all difficult problems such as serious noise that the easy distortion of sound causes because of the vibrating membrane space is extremely limited when especially sound is big, also magnetic material just can obtain powerful permanent magnetic because of the superpower magnetic that adopts strong magnetic permanent-magnet alloy and have only needs seldom with same powerful magnetic reserve capability, make product of the present invention extremely easily do very for a short time, very light, very thin but its tonequality, power and sensitivity are but very excellent, thereby solved small-sized that existing product needs to be resolved hurrily, ultra-thin, ultralight, high-power and high tone quality, a serial difficult problem such as high sensitivity, be equipped with controlled easily (convenience) control power driving circuit again, just satisfactorily realized the utility model and goal of the invention thereof comprehensively for a total inventive concept.

Accompanying drawing and operation principle and advantage explanation:

Contrast accompanying drawing: Y is a loud speaker; V is the magnet of Y; Q1 and Q2 are two of Y moving (sound) independent of each other circles, and wherein: Q1 is interior type moving-coil (being called for short inner ring, the similar abbreviation of Q2), and B is for reinforcing the specially designed backplane level of Q1, and Q2 is the outer ring; X is the hollow magnetic pole of Q1 and Q2; Z is that the vibrating membrane of Y is a sounding body; P is that the fixed support of Z is also used as outer magnetic pole; D is a diode; J is a power tube, and c is that output (current collection) utmost point of J, base stage, the e that b is J are the emitter of J; K1 is an audio signal input control switch, K1 ', K1 " be respectively the end of K1; K2, K3 are respectively two group winding FF ' and the audio input end F of GG ' and the control switch of G of the coil M of Q1; K4, K5 are respectively two group winding HH ' and the audio input end H of II ' and the control switch of I of the coil N of Q2; C1 is the audio frequency input capacitor; C2 is every direct sum audio frequency output capacitor; R1 is power tube J base stage b (biasing circuit, an electric current) resistor; R2 is power supply and the loading resistor of c; R3 is the resistor of the working point of the path of e and stable J.

The end of C2 is electrically connected with the end of K2-K5, the other end of C2 is electrically connected with the negative pole of D and the end of c and R2, the other end of K2-K5 is electrically connected respectively with own corresponding F4 end, each end of F '-I ' directly is electrically connected with one (bearing) utmost point of power supply is ground connection, the positive pole of D is electrically connected with the end K1 ' of K1, the other end K1 of K1 " be electrically connected with b, K1 is electrically connected with the end of R1 and C1; the other end of R1 and R2 and power supply+extremely be electrically connected; the other end of C1 is electrically connected (omission) with this machine audio-source output, and the end of R3 and e are electrically connected, the other end ground connection of R3.

Further reference to the drawings described structure, function and innovation advantages: Speaker Y due to adopt permanent magnet magnetic materials, so its very thin magnet V, X is also made of hollow core, which greatly reduces the weight and volume; another , because the core of the inner and outer two poles and is hollow, it can be arbitrarily chosen within or outside the core layer and its corresponding space is used to put the moving coil Q1 and Q2 and activity space, especially when combined because the two simultaneously placed two permanent-magnet coil to increase the output power and two voice coils and the vibrating membrane corresponding to the position of the volume and quality of different beneficial regulation may further use, the exterior moving coil the internal space of the inner moving coil type are produced in the two windings of the inner wall of the moving coil and the moving coil shape the inner and outer wall of a winding fabric (this design as well as series of other advantages, described later), This also eliminates the need of the moving coil and its activities shall also be leaving a lot of space accounted for more compact speaker; Furthermore, the present invention is a moving coil windings that changed the traditional single single coil winding in series to a single lane in the same direction between both dual and single winding can be connected in series or in parallel with a variety of usage and uses independent coil winding that is independent, so that each coil, the diameter and weight and effective (ie, generation and cutting magnetic lines) line length and output size and uniformity and resistance (including DC resistance and AC impedance), etc. with the volume and increase the output power and reduce the distortion is to enhance the sound quality (see below) is closely related to a series of key indicators and data simultaneously to achieve highly consistent, and these It is a major shortcoming of traditional voice coil and unmatched, as its single coil DC resistance and energy consumption (DC resistance due to direct energy and reduce the output power and heat, and even burn the voice coil of things to have occurred, is not uncommon , relatively speaking AC resistance that impedance is generally not energy nor heat) only the traditional voice coil in series 1/2, when only a small volume when either the handset or speakerphone mode can only appoint a group of voice coil to reduce the volume and power to extend battery life and life, when you need a large volume of parallel coil DC resistance when compared to traditional voice coil in series 1/4, these are two separate coils because the number of laps each and DC coils in series resistance of only 1/2, while increasing doubled because of the parallel equivalent diameter, the DC resistance can be halved again, when you need a very low volume can also be connected in series, we can see its adaptation , applicability and packages (and) very wide compatibility is very strong, indeed many advantages but also important, because these are precisely the main function of most audio tools and use value lies; Fourth, due to expansion not only increase the diameter of the coil and outward direction, the magnetic core is designed to be a hollow core and the inner movable ring is designed and the corresponding inner windings, in particular because the present invention, the inner coil is attached to the inner wall of the voice coil bobbin with the aid of non-winding- The protective effect of the outer wall of the voice coil and the core is difficult to friction, unless severe friction are worn to the extent of the outer wall, and this possibility is very small probability of occurrence, and the other is also the underside of a coil Approximately 0.1-1mm thick plate can be thin layer of B in order to enhance its support, coupled with the coil at the top of the diaphragm firmly glued directly even within the voice coil and diaphragm shape made directly integrated and powerful resistance to deformation, These are also the present invention may have a series of important only unique advantages, it can effectively prevent the common traditional double-pole magnetic seam formed solid core moving coil speaker coil due to long-term exercise and heat or moisture expansion and deformation due to collision or fixed double pole fasteners such as nails or screws loose binder such as gum produced the double pole shift, so that the coil core friction with little distortion and tone when the coil insulation layer (due to thin enameled paint and heat-softened or degeneration such as adhesion reduction or even rupture and it is easy to quickly) is generated after a strong core frayed noise] or a combination of space activity type, not only effectively prevent the deformation and displacement and its adverse consequences, but also effectively reduce weight and / or volume, and efficient (especially outside equation can be combined and converted to the use of permanent magnetic twice as sound power) use of the internal magnetic field strength and magnetic flux density is much higher than outside, the magnetic flux density is much higher than the external magnetic field characteristics, which Even the moving coil which only pass to produce only a weak weak alternating magnetic field and the magnetic force of the permanent magnet but its constant permanent magnetic field generated by a strong interaction (repulsion force of the same polarity, opposite polarity magnetic phase lead ) is also due to its strong permanent magnet to produce the same powerful suction, repulsion has been significantly increased (equivalent to enlarge) force, thereby increasing the energy of the moving coil activities to promote adhesion of whom film, is one of the sounding body vibration energy is synchronous growth of Z, which is small alternating magnetic field (force) by means of a strong permanent magnet, only the utterance to consume a lot of power is small can be easily part of the permanent magnetic force also converted into sound that is part of the energy consumption required to promote the voice coil and diaphragm transport (vibration) and thus the kinetic energy of moving further converted into promoting air transport (vibration) dynamic kinetic energy that is audible acoustic energy and thus the input power can also be obtained the smaller the larger the volume, which increases the output power of the moving coil, the alternating magnetic field that is smaller by a strong permanent magnet can be amplified, it can be used a smaller input power to obtain a larger output power allows the present invention and its power speaker driver circuit and the corresponding components to further thin small and high-quality, consumption of electricity and heat according to the law of conservation of energy principle also due to the increase of the output power smaller, thereby significantly reducing the sending and receiving power and heat and battery and its energy consumption and environmental pollution and the use of cost, as a result only a small voice input power, it makes only a small audio input signal can reach Call purposes, equivalent to improve the overall quality of the call, such as reduced sensitivity and directivity and call disconnection, etc., which can transmit and receive power reduction can be bi-directional, meaning that both the transmitter and the transmitting station and the number of devices or receiving device that transmit power corresponding mobile audio receiving device can be bi-directional transceiver power reduction; in the circle and outer windings made of inner and outer coils of a single layer, not only within the same type of dynamic sound can be reinforced ring to reduce the deformation of the voice coil, but also because the inner and outer coil voice coil, the outer wall of the fastening and adhesion in opposite directions cancel each other, and when the coil is energized due to the work coil is divided into an inner and outer layer , each producing less heat (only double 1/2) and due to heat (inner plus outer) area increased exponentially and heat quickly, so the cooling effect is good, in addition, because of the inner and outer coils i.e. thermal expansion outward direction, the inner space required expansion expansion expansion of the outer ring is exactly the gap can be provided, and when the coil power to stop the work and heat, its inner and outer coil cooling shrinkage direction also agreed that all inward contraction of the inner ring just vacated space required for the outer ring contraction of the internal space, these factors have to protect the voice coil, the external thermal expansion coefficient and high level of consistency, for a period words of high quality simultaneously and comprehensively done less heat, heat quickly, the same type, this series is the traditional advantages of being extroverted double voice coil are not available, such as a voice coil deformation, loose or even fall off even winding burned most of them mainly due to the double-overlapping windings heat fast, cooling slowly, and between the voice coil and the winding thermal expansion coefficient and the uneven force caused; loudspeaker diaphragm Y Z and Q are fixed voice coil support (ADS) P frame made with the same width and parallel to the magnet, and because of its width and parallel to the magnet, but also with a hollow core and the magnet that is made of the same material but with a permanent magnet with strong permanent magnet, it is also used as the outer magnetic pole and to strengthen the role of the permanent magnet on the moving coil and effectiveness, and both for the inner and / or outer especially outer magnetic effects are extremely significant to strengthen further miniaturization of the speaker light, so that the overall size and weight of the speaker absolute minimum, these factors have further more effective in reducing overall production and use, especially large volume of mobile phones, weight, heat and energy consumption and environmental pollution and operating costs, such as longer battery life and reducing the number of transmitting stations and (transmit power) scale and transmitting and receiving devices sending and receiving the power of the human body caused by electromagnetic hazards and environmental pollution quantity of waste batteries and reduce battery power consumption and extend battery standby time and improve market competitiveness (thin miniaturization is a fundamental symbol, while low heat is a fundamental prerequisite for a small thin), and other significant advantages; diode D acts as when using a smaller handset function so that the energy of the audio signal using its forward conduction characteristics in order to direct input speaker so that only the faint sound to fit only a small volume of the earpiece features, then use the speaker instead of the handset and play and act accordingly earpiece function, and whether it is for the handset or handsfree speaker when using the diode D and can automatically use of their great resistance to block the power amplifier inverting tube J output (collector) electrode c and power and load resistor R ...₂The reverse pumping of Zhi stream to switch K₁', it is C that also has just avoided prime Yin frequency source signal₁And line Yin Yu K₁Even ' too near and Zai Yang sound device Zuo is hands-free Yi Yin rises while using induction and through power tube the distortion whistle after reflex is amplified repeatedly etc. interference, but Yang sound device Zai while listening the tubular state Yin base stage b without bias current, not conducting of J, its c utmost point and R₂Though upper You flow Zhi that Ya falls without electric current and power or direction changes, namely without the alternating signal generation, therefore also is without C₁Induction problem is namely noiseless, and the positive terminal Yu of D is every Zhi (stream power supply) capacitor C₂Yi end be electrically connected to, its negative pole end is Yu Yin signal input frequently gauge tap K₁Yi end K₁' be electrically connected to, Yi provides the speaker listened under tubular state power supply input channel frequently; C₂Can isolate simultaneously R₁And R₂Respectively generation and character Yu Zuo Yong all not identical Zhi stream Ya fall and Zhi stream electric current, Yi avoids moving-coil also Yin by a little Zhi of Zhe stream electricity and produce that permanent-magnetic field power resist and the magnetic that weakens Yang sound device permanent-magnet material is reduced side effects such as " demagnetizations " or destruction Yang Shengqi comprises Yin Zhi Yu performances such as Yin amounts, K₂-K ₅As Yong be further regulate and control Yin Zhi, Yin the amount or quiet, Yin regulation and control Yin amount time also regulated and controled vibrating membrane vibration position, intensity Yu the amplitude Effective Regulation Yin Zhi: when each key is all closed the Yin amount the largest, while all opening be quiet, Yi this analogize, Zhe Yang just can be by routine reduction input Yin frequently the traditional approach of signal strength signal intensity regulate and control Yin Zhi, Yin amount, improve signal to noise ratio and namely improve Yin Zhi thereby reduce Zao Yin; K₂-K ₅Also can adopt variable resistor is that Yue variant Yin amount Yin Zhi that potentiometer Yi becomes switch is regulated to the gradual change formula and regulates and controls continuously, and is no matter to adopt switch or potentiometer regulation and control all more reliable, convenient and simple than the loaded down with trivial details Yi bad integrated chip computing circuit Yu regulation and control of complexity; C₂Another as Yong be regulation and control Yin Zhi, by regulating C₂The capacitance size control the frequency height scope of the tone currents that passes through, You Yu C₂When Zai Yang sound device doubles as receiver while using, also is C₁Tone currents path is provided, namely has been the Zong path that comprises power amplifier output tone currents, its capacitance Yin consider the electric current that passes through greatly as value Yi than C₁For greatly, You is Yin C₂Yu C₁What form is series capacitance circuit and cut down C2 part capacitance, add Zai C₁And C₂Also has D between Zhong₂The DC internal resistance in number Europe-tens of Europe is to from C₁The attenuation of Yi tentering degree of tone currents of upper frequency, therefore be easy to by suitable adjustment C₂(actual measurement is Yue C₁The 3-10 of capacity is doubly) capacity just can the compatible C of fine realization₁Frequency characteristic is Zong body Yin Zhi balance; Pass through K₁Connecting and disconnecting R₁Be electrically connected to change fixedly electrical connection pattern of traditional bias current Yong property of a specified duration with the bias current of b, therefore not only can ensure aforesaid when the Yong receiver power tube base stage do not produce Zao Yin and disturb receiver Yin Zhi because without bias current, being cut off, provide the power tube bias current to reduce distortion Yi in the time of also can ensureing as Yang sound device replacement receiver Yong to improve Yin Zhi, e is by the stable operating point of Yu it, connecting and little Zu Zhi (being Yue 0.5-1 Europe as Yi) the resistance R of double Zuo protector Yong₃Ground connection, Yi form Yin alternating current circuit loop frequently.

Embodiment and operation principle of the present invention and advantage supplementary notes: contrast accompanying drawing, so loud speaker Y because of adopt permanent magnetism ferromagnetic material its magnet V and magnetic core X all do very thin, general 0.2-0.5cm even more (surpass) thin promptly enough, magnetic core X makes hollow type and will move (sound) and enclose Q ₁And/or Q ₂The unsettled the top that is placed in magnetic core is the magnetic pole place, the moving-coil wall is to keep 0.1-0.2mm intermittently to be advisable with magnet core wall, because have only the magnetic line of force at magnetic pole place the most concentrated, the die magnetic force of density is the most powerful, the degree of depth of laying topmost flushes on the plane with magnetic core substantially with facial planes in the voice coil loudspeaker voice coil winding, to ensure the voice coil loudspeaker voice coil Shi Douke cutting magnetic line and produce the maximum promotion vibrating membrane i.e. power of vibration that is synchronized with the movement to greatest extent that no matter moves up and down, thereby obtaining the maximal audio power output is max volume, the shape of vibrating membrane can be a matrix, convex, plane, round, square type or other Any shape or its combined shaped all can, present embodiment is that further conserve space adopts plane, but this to be not the present invention can only adopt planar shaped (down with); Diode D with power greater than the silicon of 0.1W, withstand voltage any kind greater than 6V or germanium diode all can, present embodiment adopts good and cheap and the most widely used 1N4004 and 1N4007 etc.; Power tube J with power greater than the PNP of 0.3W, withstand voltage any kind greater than 20V or NPN pipe all can, accompanying drawing adopts 0.5-1W, withstand voltage 25-50V NPN type, gets final product as adopting the positive-negative-positive power supply polarity being opposite with the NPN type; Audio signal input control switch K ₁With the two group switches of the miniature hilted broadsword of any kind such as press-key lock fixed pattern, dial type, Electronic Control as touch or press-type etc. all can, present embodiment adopts push type, use operating maintenance etc. more simple and convenient; With K ₁As a same reason, voice coil loudspeaker voice coil K switch ₂-K ₅Also with miniature press-key lock fixed pattern but use hilted broadsword simply connected formula instead and get final product; Capacitor C ₁With the non-polar condenser of capacity greater than 0.1 μ F, withstand voltage 6-10 volt, present embodiment adopts 0.3 μ F6.3 volt; Capacitor C ₂With capacity greater than the nonpolarity or electrolytic capacitor of 1 μ F all can, present embodiment adopts 10 μ F10 volt electrolytic capacitor; R ₁And R ₂Resistance with the difference at double of concrete power tube J and parameter such as multiplication factor etc. and mains voltage variations broad, obviously also just can not be in advance in concrete mode such as embodiment and stipulate its occurrence, so state reference value R ₁200 Europe-20K and R ₂20 Europe-2K use only for reference, but this does not influence the described those skilled in the art of Patent Law at all and implements this patent, because at the selected back of concrete power tube, its product description or consult reference book such as handbook and all can obtain every accurately concrete parameter, to make parameter reach optimum range also be the most basic prerequisite general knowledge and test a large amount of and commonly used is arranged equally and the detailed introduction of method of adjustment and reference book, product description etc. and record and belong to general knowledge together to adjust resistance value; As previously mentioned, because of R ₃Function mainly be stable operating point and serve as insurance (resistance) thread, and the promptly in most cases little in normal operation big variation of these functions, so it is less demanding to accuracy and accuracy, in most cases resistance is all very suitable in the interval in 0.5-2 Europe, too low stability and safety effect is poor, too high important parameters such as amplifying power influence to loud speaker and the power tube power output and the latter is bigger; All the other situations and accompanying drawing and explanation thereof, advantage are introduced similar, no longer repeat superfluous stating.

The present invention also has following serial main advantages: make things convenient for freely because the present invention integrates receiver and loud speaker and function thereof and can freely switch and switch extremely, can switch to receiver or loud speaker mode at any time arbitrarily and need not dropped calls, single loud speaker double as receiver and ultra-thin, ultralight, subminaturization (can do also little also gently also thin more a lot) and high sensitivity than receiver earphone, high effect and high-output power and tonequality grace, serial great innovation of the little grade of distortion and advantage, these advantages are for realization and satisfy the frivolous miniaturization of product, especially melodious grace of tonequality and consumer's needs at any time and likes and freely select arbitrarily to converse and the crucial serviceability and the consumption demand aspect of many decision market shares such as Music Appreciation mode provide very big convenience and competitiveness, as be beneficial to and correct so-called ear (plug) machine and alleviate radiation and reach erroneous tendancies such as harm to the user, not only bother inconvenience because of using earphone as described above, and it is real for having increased radiation and harmfulness.

The present invention integrates above-mentioned serial main advantages, so tool applications well and market prospects, as except that the above and mobile phone etc. require the frivolous small-sized low energy consumption lower calorific value application, such as wide too with the application in frivolous small-sized high tone quality electronic applications such as the notebook computer in the huge market of tool, sounding electronic dictionary and products thereof with mobile phone.

Claims (4)

1. inner and outer double-magnetic hollow magnetic-core type loudspeaker, its feature is as follows: ferromagnetism alloy permanent magnet connects and fixedly vibrating membrane fixed support and hollow magnetic core; The vibrating membrane fixed support connects and fixing vibrating membrane, and the outer magnetic pole of double as hollow magnetic core; The hollow magnetic core is made of inside and outside magnetic pole, built-in double-winding voice-coil; Vibrating membrane connects and fixing double-winding voice-coil; Double-winding voice-coil is double-wire spaced, separate; The inside and outside wall single layer winding of external form double-winding voice-coil, the bottom connection of interior type double-winding voice-coil also is fixed with backplane level; Shared vibrating membrane and outer magnetic pole.

2. the power amplifier and the control circuit of the described inner and outer double-magnetic hollow of claim 1 magnetic-core type loudspeaker, its feature is as follows: every direct sum audio frequency output capacitor (C ₂) an end and audio frequency input control switch (K ₂), (K ₃) an end be electrically connected, audio frequency output capacitor (C ₂) the other end and negative pole and the collector electrode (c) of power tube (J) and the power supply and the loading resistor (R of collector electrode (c) of diode (D) ₂) an end be electrically connected audio frequency input control switch (K ₂), (K ₃) the other end respectively with audio input end (F), (G) electrical connection with two group windings of the coil (M) of the moving-coil (Q) of own corresponding loud speaker (Y) (FF ') and (GG '), the audio output of two group windings of the coil (M) of the moving-coil (Q) of loud speaker (Y) (FF ') and (GG ') (F '), (G ') ground connection, the positive pole of diode (D) and audio signal are imported control switch (K ₁) an end (K _{1 '}) be electrically connected audio signal input control switch (K ₁) the other end (K _{1 "}) be electrically connected audio signal input control switch (K with the base stage (b) of power tube (J) ₁) with the resistor (R of the base stage (b) of power tube (J) ₁) and audio frequency input capacitor (C ₁) an end be electrically connected the resistor (R of the base stage (b) of power tube (J) ₁) and the power supply and the loading resistor (R of the collector electrode (c) of power tube (J) ₂) the other end be electrically connected audio frequency input capacitor (C with the positive terminal (+) of power supply ₁) the other end be electrically connected the resistor (R of the path of the emitter (e) of power tube (J) and the working point of stable power tube (J) with this machine audio-source output ₃) an end and the emitter (e) of power tube (J) be electrically connected, stablize the resistor (R of the working point of power tube (J) ₃) other end ground connection.

3. the power amplifier and the control circuit of voice-coil speaker in the described hollow magnetic core internal magnetic pole of claim 2 is characterized in that power tube is positive-negative-positive or NPN type.

4. the power amplifier and the control circuit of voice-coil speaker in the described hollow magnetic core internal magnetic pole of claim 2 is characterized in that diode is silicon or germanium diode.