CN2420806Y

CN2420806Y - Double magnetic field loudspeaker

Info

Publication number: CN2420806Y
Application number: CN 00233610
Authority: CN
Inventors: 张贵益
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-05-10
Filing date: 2000-05-10
Publication date: 2001-02-21
Anticipated expiration: 2010-05-10

Abstract

The utility model relates to a loudspeaker with double magnetic fields. A loudspeaker is provided with two magnets, two T-shaped irons and two warcies, a speech coil is made by winding an upper and a lower rolling pairs, and the upper and the lower rolling pairs are respectively arranged in a constant magnetic gap with strong magnetic flux. The utility model has enough intensity and is provided with direct-current magnetic circuit devices of two constant direct-current magnetic fields, the width of the magnetic gap is smaller than the traditional loudspeaker, and the constant precision of the magnetic flux is enhanced. When the speech coil passes through the electric current, the speech coil has the driving force, the driving force is reduced by the double-layer speech coil, and the non-linear distortion is reduced.

Description

Two magnetic fields loud speaker

The utility model relates to a kind of pair of magnetic field loud speaker, refers to a kind of two stationary magnetic fields that have especially, to promote the loud speaker of its electroacoustic performance.

General traditional loud speaker is as shown in Figure 1 mainly by a magnet 11, a T iron 12 and a washer 13 are formed, magnetic flux distribution in its annulus gap as shown in Figure 2, Distribution of Magnetic Field is more even in the air gap middle part, and it is on a declining curve in the top and the bottom Distribution of Magnetic Field of air gap, the Distribution of Magnetic Field of dawn top and bottom is also asymmetric, when the voice coil loudspeaker voice coil vibration is in top and bottom, magnetic field intensity has produced nonlinear variation, thereby cause voice coil loudspeaker voice coil also to produce nonlinear distortion, conventional loudspeakers is by reducing the inhomogeneous distortion that is produced of aforementioned magnetic flux distribution, usually change method for winding in voice coil loudspeaker voice coil, as shown in Figure 3, the tradition voice coil loudspeaker voice coil 2 with enamelled wire 21 in papery, skeleton 22 coilings of chemical film or metal form, and only are a volume width of cloth, and its winding method has following example approximately:

1, designs with the minor circle as shown in Figure 4, be b≤a-2s (s is the voice coil loudspeaker voice coil amplitude), the volume amplitude ratio washer of voice coil loudspeaker voice coil 13 is short, and the oscillating region of voice coil loudspeaker voice coil 2 is limited in the magnetic field homogeneity range in magnetic circuit magnetic space, the method improves cost owing to making washer 13 and magnet 12 enough big, enough thick.

2, design with long voice coil as shown in Figure 5, i.e. 6 〉=a+2s, make volume amplitude ratio washer 13 thickness of voice coil loudspeaker voice coil 2 long, make interior magnetic flux of magnetic gap and voice coil loudspeaker voice coil relatively in oscillating region, to reduce because of the inhomogeneous caused distortion the method in magnetic field need be enough long owing to rolling up the width of cloth, the line footpath of voice coil loudspeaker voice coil is in the constant situation chap thereupon of impedance, cause the weight of voice coil loudspeaker voice coil 2 to increase, the internal diameter of washer 13 increases, and makes the magnetic air-gap become big total magnetic flux and then dies down, the relative step-down of the efficient of loud speaker.

So traditional Yang Sheng device can't be by the problem that fundamentally solves distortion.

The main purpose of the utility model is to provide a kind of pair of magnetic field loud speaker, mainly establish with two magnet, two T iron and two washers in loud speaker, make the magnetism loop of loud speaker produce two single magnetic fields,, improve the tonequality of Yang Sheng device to improve magnetic flux density because of two magnet.

Another purpose of the utility model is to provide a kind of pair of magnetic field loud speaker, this loudspeaker voice coil is above, the coiling of the last volume width of cloth, this upper and lower volume width of cloth is in the enough strong magnetic gap of constant magnetic flux separately, cooperates two magnetic fields to improve and drive the caused nonlinear distortion of magnetic circuits.

The utility model purpose is achieved in that a kind of pair of magnetic field loud speaker, and loud speaker is established with two magnet, two T iron and two washers, above, the last volume width of cloth coiling of voice coil loudspeaker voice coil, and this upper and lower volume width of cloth is in the enough strong magnetic gap of constant magnetic flux separately.

In sum, the utility model following advantage of having had at least:

1, having sufficient intensity, the dc circuit magnetic loop device of two constant D.C. magnetic fields, and the magnetic gap width is little than conventional loudspeakers, improves magnetic flux Chang Midu.

2, voice coil loudspeaker voice coil promptly is subjected to an actuating force when electric current passes through, and double-deck voice coil loudspeaker voice coil reduces this actuating force, reduces nonlinear distortion.

Below in conjunction with the utility model being described in further detail with accompanying drawing and specific embodiments.

Fig. 1 returns structure chart for the magnetic of known loud speaker.

Fig. 2 returns the structure action diagram for the magnetic of known loud speaker.

Fig. 3 is the voice coil loudspeaker voice coil figure of known loud speaker.

Fig. 4 is the minor loop graph of known loud speaker.

Fig. 5 is the long loop graph of known loud speaker.

Fig. 6 returns structure chart for magnetic of the present utility model.

Fig. 7 returns the structure action diagram for magnetic of the present utility model.

Fig. 8 is voice coil loudspeaker voice coil figure of the present utility model.

Fig. 9 is a structure chart of the present utility model.

Figure 10 is an action diagram of the present utility model.

Please be simultaneously referring to Fig. 6,7, the utility model is mainly established with two magnet 31, two T iron 32 and two washers 33 in loud speaker, to produce the magnetic field of two single stables, the magnetic field in the magnetic air gap is kept symmetrically, improve magnetic density, improve the tonequality of loud speaker

And as shown in Figure 8, voice coil loudspeaker voice coil 4 of the present utility model, in papery, more than on the skeleton of chemical film or metal, last volume 41,42 coilings form, to constitute double-deck voice coil loudspeaker voice coil structure, make on this, last volume 41,42 are in the enough strong magnetic gap of constant magnetic flux separately, as shown in Figure 9, because voice coil loudspeaker voice coil 4 volume 41,42 are designed to the minor circle and washer 33 is narrower design, voice coil loudspeaker voice coil 4 weight are lightened, and magnetic flux strengthens, when voice coil loudspeaker voice coil vibrates, the volume of voice coil loudspeaker voice coil 4 41,42 all are controlled in the uniform magnetic field, effective frequency range is expanded, reduces distortion, improved efficient.

Please again referring to Fig. 4, the operating principle of conventional loudspeakers, magnet 11 produces a uniform magnetic field, 12 of washer 13 and T iron are formed a magnetic loop, 12 of washer 13 and T iron have a very little air gap (being commonly referred to as magnetic air gap), voice coil loudspeaker voice coil 3 is suspended within the magnetic air gap, magnet has two fixing SN utmost points, if the N that is indicated among the figure, the S utmost point, just produce a uniform magnetic field in the magnetic air gap of 13 of T iron 12 and washers under the effect of magnet 11, the magnetic line of force direction in the magnetic field to the S utmost point, is promptly pointed to washers by T iron 12 by N utmost point starting flow, when tone currents flows into loudspeaker voice coil 3, the Yi Fulaiming Left Hand Rule towards the N utmost point, makes four fingers that stretch mutually can with the sense of current on the left hand palm, so, refer to that with four vertical thumb direction is the direction of motion of voice coil loudspeaker voice coil, that is voice coil loudspeaker voice coil 3 is subjected to a power F who makes progress, the electric current I that flows through in the size of F and the voice coil loudspeaker voice coil 3, the salty equivalent total length L of density B and voice coil line of answering of magnetic in the magnetic air gap is directly proportional, i.e. F=B * 1 * L

Total length L in the loudspeaker design manufacture process once determining promptly to become constant, therefore, when voice-frequency signalling current process loudspeaker voice coil 3, voice coil loudspeaker voice coil 3 is subjected to a power that is directly proportional with voice-frequency signalling current I, because voice coil loudspeaker voice coil 3 is connected with drum paper rigidity, when voice coil loudspeaker voice coil vibrates in magnetic air gap, excite surrounding air that identical vibration takes place during the vibration of drum paper, form the sound wave that imports people's ear into.

And as shown in figure 10, the utility model top magnetic loop is identical with conventional loudspeakers, the magnetic line of force in magnetic field, its underpart is opposite with top, for the direction of motion that magnetic field, bottom voice coil loudspeaker voice coil is produced identical with top, then in same, the direction of bottom tone currents must be opposite with top, and the designed double-deck voice coil loudspeaker voice coil 4 of the utility model, volume 41 sense of current are just in time opposite with last volume 42 sense of current on it, therefore just solved the problem of the sense of current, when the tone currents signal change, voice coil loudspeaker voice coil is subjected to force direction that corresponding variation also takes place, so, see it from integral body, existing two magnetic fields of the utility model are equivalent to an automobile two moving systems, has strengthened motoricity, reduces distortion and has improved efficient.

Claims

1, a kind of pair of magnetic field loud speaker is characterized in that: loud speaker is established with two magnet, two T iron and two washers, above, the last volume width of cloth coiling of voice coil loudspeaker voice coil, and this upper and lower volume width of cloth is in the enough strong magnetic gap of constant magnetic flux separately.