CN1878431A

CN1878431A - High-fidelity wide band high-power flat loudspeaker

Info

Publication number: CN1878431A
Application number: CN 200610020659
Authority: CN
Inventors: 张德忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-04-07
Filing date: 2006-04-07
Publication date: 2006-12-13

Abstract

The invention relates to a high-fidelity wide band high-power plate loudspeaker, which is characterized in that: the voice coil is fixed on the closed magnetic loop whose support is soft magnetic material; the vibration sound disc is formed by the flexible conductive disc with central hole and fixed four edges or several (at least three) embedded concentric short-circuit rings with central holes; the magnetic path is all through the central hole of vibration sound disc to be inventive loudspeaker. For reaching high fidelity, the magnetic path is added with one magnetic bias coil; when the loudspeaker works, correct direct current or ultra voice alternative current magnetic bias current is functioned on the magnetic bias coil, to make the acoustic magnetic field of magnetic path avoid the non-liner area of magnetization curve. The invention has wide sound range, high power, small distortion, thin volume, variable shape, simple structure and low cost, while it is resistant to the damage and non-magnetic disturbance.

Description

High-fidelity wide band high-power flat loudspeaker

Technical field

The invention belongs to a kind of high-fidelity wide band high-power loud speaker of making sounding body with the plane vibration dish.

Background technology

Conventional loudspeakers is sounding with the cone of a fixed size of voice coil loudspeaker voice coil promotion, such project organization makes conventional loudspeakers in use show following three big defectives: 1, the peviform sounding body has limited the miniaturization and the slimming of loud speaker, can not satisfy the requirement of modern flat-panel display device to the loud speaker slimming; In the epoch that modern audio-visual equipment all tends to miniaturization, our super fidelity audio amplifier still is good at tall and big.2, Gu Ding vibrating basin diameter, make the loud speaker passband very narrow, amplitude-frequency characteristic is very poor, and whole Frequency Response has be unimodal characteristic on its mechanical resonant frequency point, make people when doing Hi-Fi sound-box, have to make height, in, end loud speaker realizes with the frequency division compound mode.3, voice coil loudspeaker voice coil is a pusher, is again the some of sounding body, and mechanical structure of himself and performance produce contradiction, particularly in hi-fi system, realize big dynamic range, then require power to want big, like this to the requirement of mechanical strength height of voice coil loudspeaker voice coil, coil is compelled to do more solidly, but the machinery inertial of voice coil loudspeaker voice coil increases like this, and high frequency characteristics will descend greatly, for this reason, voice coil loudspeaker voice coil work all in its extreme environment, is very easily burnt.Produce the 20KHz bandwidth, the high-fidelity sound field of 100dB, people often need spend whole sound system price over half in sound box system.

For this reason, a lot of corresponding appearance of various panel speaker schemes that design at above-mentioned defective, it as application number the sounding body of a kind of loud speaker of 03150868.5, its vibrating diaphragm is arranged to highly approach the wavy annular sounding body of radiation on plane, well solved the loud speaker ultrathin typeization and within the specific limits broadening frequency band.But it has still used original voice coil loudspeaker voice coil to drive the sounding film mode, still has the mechanical strength and the performance tradeoff of voice coil loudspeaker voice coil, easily burns the low defective of cost performance when high-power.The patent No. is that the gamut electrodynamic loudspeaker that ZL01246618.2 invented has used the plane vibration film to make sounding body equally, and the motion of using conducting liquid is used as the power source of sounding film, because the mobility of liquid is poor, when the conductive liquid pipeline is connected to bellows chamber behind the vibrating membrane in addition, be equivalent to that the pipeline cross section is huge to be increased, reduced the Oscillation Amplitude of tibial membrane greatly, though its thinking has been abandoned the voice coil loudspeaker voice coil that has problems, but high-powerly satisfying on the big dynamic range in that the high-fidelity of taking all factors into consideration loud speaker is necessary, may be to lose more than gain.

Summary of the invention

The object of the invention will solve above-mentioned three big defectives of conventional loudspeakers, dreams up a kind of sounding body that substantive breakthroughs are all arranged aspect above-mentioned three.Finish modern electroacoustic techniques to high-power with a loud speaker, high-fidelity, the requirement of ultra-thinization three aspects.

Feature of the present invention is that voice coil loudspeaker voice coil is fixed on the soft magnetic material is on the closed magnetic circuit of support; Vibration sound disc constitutes with the compliant conductive dish of the fixing tensioning in four limits of middle perforate or the disk that is embedded with a plurality of (more than three) concentric conducting ring mutually of middle perforate; Loud speaker of the present invention is made in the middle perforate that magnetic circuit is passed completely through vibrating disk; In order to reach the high-fidelity requirement, require in magnetic circuit, to add a magnetic bias coil, add suitable direct current or superaudio alternating current biasing electric current during speaker operation on the magnetic bias coil, make audio frequency magnetic field in the magnetic circuit avoid the inelastic region of magnetization curve.

Fig. 1 below in conjunction with accompanying drawing is described in further detail high-fidelity wide band high-power loud speaker principle of the present invention.

In Fig. 1,1 closed magnetic circuit of making for soft magnetic material, 2 for being fixed on the voice coil loudspeaker voice coil on the magnetic circuit, and 3 be dull and stereotyped sounding dish, and 4 for being embedded in the annular conductive coil in the dull and stereotyped sounding dish mutually, the 5 magnetic bias coils for raising tonequality.When in the voice coil loudspeaker voice coil 2 by through tone currents that power amplifier amplifies the time, the audio frequency that electric current produces in 1 changes the centre bore that magnetic flux passes sounding dish 3, each conducting ring 4 in 3 produce mutual fluxes, mutual inductance magnetic field and audio frequency magnetic field interaction and force 4 to promote the mechanical oscillation of 3 generation audio frequency and sounding.Because 1 magnetization curve is non-linear, make the zero crossing of tone currents produce very big distortion, in magnetic circuit, add a magnetic bias coil 5, in 5, add a constant direct current or a superaudio alternating current biasing electric current, accurately adjust the size of bias current and the amplitude of audio signal, make the audio frequency magnetic flux avoid the inelastic region of magnetization curve.

Loud speaker of the present invention has that range is wide, power is big, distortion is little, build is thin, profile is random, simple in structure, easy to process, with low cost, be not afraid of breakage and do not have characteristics such as magnetic disturbance.

1. range is wide:

Owing to be embedded with the concentric conducting ring (conductive plate of middle perforate can be regarded the concentric conducting ring formation of numerous radial arrangement as) of a plurality of radial arrangement in the loudspeaker vibration sounding dish of the present invention mutually, the radius of each ring is different, each ring just has different mechanical resonant frequencies doing the time spent separately, the quantity of conducting ring is many more, it is even more to distribute, the loud speaker amplitude-frequency characteristic is smooth more, does not have conventional loudspeakers pronunciation dish fixed size and produces the amplitude-frequency characteristic of single crest; The outer internal diameter ratio of sounding dish is big more, and amplitude-frequency characteristic is wide more; Be easy to just on a loud speaker, to have realized smooth amplitude-frequency characteristic from 20Hz to 20KHz.

2. power is big:

In the loud speaker of this invention, voice coil loudspeaker voice coil is fixed on the magnetic circuit, it can do slightlyer, more solid, do not exist traditional loudspeaker voice coil easily to burn, the diffusing defect of easily shaking, the annular conductive coil in the pronunciation dish further plays sound film reinforcement effect, the loud speaker of this invention has stronger mechanical property than conventional loudspeakers tibial membrane, so can obtain very big power output easily.

3. distortion is little:

Loud speaker of the present invention adds a magnetic bias coil in magnetic circuit, add suitable direct current or superaudio alternating current biasing electric current during speaker operation on the magnetic bias coil, make audio frequency magnetic field in the magnetic circuit avoid the inelastic region of magnetization curve, audio signal magnetic field is almost distortionless to be added on the pronunciation dish, thereby makes the distortion of this loud speaker very little.

4. build is thin:

In the loud speaker of this invention, by the pronunciation dish that has used the plane, loud speaker can be done very thinly, and its thickness is mainly by the required space decision of magnetic structure and pronunciation disc vibration.

5. configuration design is random:

In this loud speaker, as long as magnetic flux is passed completely through the centre bore of pronunciation dish, the shape of magnetic circuit is not required, the pronunciation dish is not necessarily leaveed no choice but circle, they all can require to be designed to arbitrary shape with machinery according to aesthstic, and the surface of pronunciation dish is the best shelter that various art drawing are made device.

6. simple in structure, easy to process, with low cost, be not afraid of breakage:

In loud speaker of the present invention, magnetic circuit can be done into two and be put together, and the each several part quality of fit is less demanding, and voice coil loudspeaker voice coil, magnetic circuit, pronunciation dish can be installed by domestic consumer after family carries out voluntarily by producing; The pronunciation dish may be the most weak link of mechanical strength, but owing to used a plurality of conducting ring type of drive, even certain partially conductive ring damages, but other ring is operate as normal still, can not produce fatal influence to loud speaker, and traditional voice coil loudspeaker voice coil type of drive in case voice coil loudspeaker voice coil burns out, just can not continue to use again.

7. owing to magnetic circuit closed, do not have hard magnetic material again, reduced the interference of magnetic field greatly external equipment.

Description of drawings

For principle of the present invention and system's implementation method are described, provide following accompanying drawing:

Fig. 1 is a principle schematic of the present invention.

Fig. 2 is a sounding dish structural representation of the present invention.Wherein 1 figure is the sounding dish structure of ring-type conducting ring, and 2 figure are sounding dish structures of flexible conductive film.

Fig. 3 has provided the concrete scheme of a kind of usefulness loud speaker playback of the present invention.

Embodiment

Fig. 2 is two kinds of structures of the sounding dish of loud speaker use of the present invention, and wherein the distribution of each conducting ring 4 requirement is closeer as far as possible among (1) figure, and the pliability of tibial membrane 3 will be got well; (2) 8 among the figure is soft conductive plate, requires pliability good; Their external diameter 6 major decision loud speaker low frequency characteristics, big more low frequency characteristic is good more, and its high frequency characteristicses of internal orifice dimension 7 decision, its size are required by high frequency characteristics mainly and magnetic circuit diameter and deciding, and the outer internal diameter ratio of pronunciation dish is big more, and amplitude-frequency characteristic is wide more; The quantity of conducting ring is many more, and it is even more to distribute, and the loud speaker amplitude-frequency characteristic is smooth more.

Fig. 3 is the concrete scheme schematic diagram with loud speaker playback of the present invention, and wherein 10 is D.C. regulated power supply or superaudio ac oscillator circuit; 9 current-limiting resistances can not require 9 as far as possible greatly to the short circuit of audio frequency magnetic flux in order to make magnetic bias coil 5; The 12nd, the optimum bias adjuster is regulated direct current (or interchange) magnetic bias that its big I guarantees to add to loud speaker and is just made audio signal magnetic field in the middle of the linearity range of the magnetization curve of soft magnetic bodies 1; The 11st, power amplifier, be added on the voice coil loudspeaker voice coil 2 by 11 Hi-Fi audio signals that amplify, voice coil loudspeaker voice coil is transformed into the magnetic field that audio frequency changes with signal code, and each conducting ring of sounding dish is passed in this magnetic field, the mutual inductance magnetic field of each conducting ring and audio frequency magnetic field interaction and promote the sounding dish and reduce the high-fidelity sound field.

Claims

1, high-fidelity wide band high-power flat loudspeaker is characterized in that: it is on the closed magnetic circuit of support that voice coil loudspeaker voice coil is fixed on the soft magnetic material; Vibration sound disc is fixed on the compliant conductive dish of the tensioning on the support or the flexible disk formation that is embedded with the concentric conducting ring more than three mutually of middle perforate with four limits of middle perforate; Add a magnetic bias coil that reduces distortion again; Allow magnetic circuit pass the middle perforate of the voice coil loudspeaker voice coil of fixed-site and vibrating disk and magnetic bias coil and make loud speaker of the present invention.

2, high-fidelity wide band high-power flat loudspeaker according to claim 1 is characterized in that: the pronunciation dish of loud speaker is fixed on the compliant conductive dish of the tensioning on the support or the flexible disk formation that is embedded with the concentric conducting ring more than three mutually of middle perforate with four limits of middle perforate; The outer internal diameter ratio of sounding dish is big more, and amplitude-frequency characteristic is wide more; The quantity of conducting ring is many more, and it is even more to distribute, and the loud speaker amplitude-frequency characteristic is smooth more.

3, high-fidelity wide band high-power flat loudspeaker according to claim 1 is characterized in that: it is on the closed magnetic circuit of support that voice coil loudspeaker voice coil is fixed on the soft magnetic material; The line of voice coil loudspeaker voice coil directly depends on the power of loud speaker.

4, high-fidelity wide band high-power flat loudspeaker according to claim 1 is characterized in that: add a magnetic bias coil in magnetic circuit, in the magnetic bias coil, add a constant direct current or a superaudio alternating current biasing electric current, accurately adjust the size of bias current and the amplitude of audio signal, make the audio frequency magnetic flux avoid the inelastic region of magnetization curve, reduce loudspeaker distortions.