CN216700304U - Magnetic conduction T iron with groove and magnetic circuit system of loudspeaker - Google Patents

Abstract

The utility model discloses a magnetic T iron with a groove and a magnetic circuit system of a loudspeaker, wherein the magnetic T iron comprises: a chassis and a cylindrical magnetizer; the chassis is connected with the magnetizer and is coaxial with the magnetizer; a cylindrical groove is arranged on the upper end surface of the magnetizer, and the central line of the cylindrical groove is superposed with the central line of the magnetizer; the difference between the diameter ∅ A of the magnetizer and the diameter ∅ B of the cylindrical groove is larger than or equal to twice of the thickness of the chassis. The magnetic conduction T iron with the groove and the magnetic circuit system of the loudspeaker can enable the T iron to enter a magnetic saturation state in advance, reduce the nonlinearity of inductive reactance, enable the vibration system to be always in a uniform magnetic field to do reciprocating motion in the vibration process, and meet the requirement of customers on the distortion of the loudspeaker with high performance; not only can reduce speaker distortion, improve high frequency response, can also alleviate T iron weight, practice thrift the cost, accomplish the lightweight simultaneously, improve product quality.

Description

Magnetic conduction T iron with groove and magnetic circuit system of loudspeaker

Technical Field

The utility model relates to the technical field of speakers, in particular to a magnetic conduction T iron with a groove and a magnetic circuit system of a speaker.

Background

Loudspeaking deviceLoudspeakers, such as automotive speakers, generally employ a structure in which a cone is fitted with a positioning support (also called a centering support, damper). The loudspeaker comprises a basin frame, a sound basin, a voice coil, a positioning ring, an upper clamping plate, magnetic steel, T iron and the like. At present, because the T iron of the traditional external magnetic loudspeaker is limited by material processing cost, most of the T irons of the external magnetic loudspeaker still adopt simpler flat-bottom and flat-top structures，The magnetic field distribution is not uniform due to the unreasonable design of the magnetic circuit system structure, so that the distortion of the loudspeaker is high。

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a magnetic conductive T-iron with a groove and a magnetic circuit system of a speaker.

According to one aspect of the present invention, there is provided a magnetically permeable T-iron with a groove, comprising: a chassis and a cylindrical magnetizer; the chassis is connected with the magnetizer and is coaxial with the magnetizer; a cylindrical groove is formed in the upper end face of the magnetizer, and the center line of the cylindrical groove is overlapped with the center line of the magnetizer; wherein the difference between the diameter ∅ A of the magnetizer and the diameter ∅ B of the cylindrical groove is greater than or equal to twice the thickness of the chassis.

Optionally, the depth of the cylindrical groove is the same as the thickness of the matched magnetic steel.

Optionally, the chassis and the outer surface of the magnetizer have a zinc plating layer.

Optionally, the bottom of the chassis is provided with a groove.

Optionally, the chassis and the magnetizer are integrally formed.

According to another aspect of the present invention, there is provided a magnetic circuit system of a speaker, including: the upper clamping plate, the magnetic steel and the magnetic T iron with the groove.

The magnetic conduction T iron with the groove and the magnetic circuit system of the loudspeaker can enable the T iron to enter a magnetic saturation state in advance, reduce the nonlinearity of inductive reactance, enable the vibration system to be always in a uniform magnetic field to do reciprocating motion in the vibration process, and meet the requirement of customers on the distortion of the loudspeaker with high performance; not only can reduce speaker distortion, improve high frequency response, can also alleviate T iron weight, practice thrift the cost, accomplish the lightweight simultaneously, improve product quality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic drawing in partial cross-section of one embodiment of a grooved magnetically permeable T-iron in accordance with the present invention;

FIG. 2 is a view showing the magnetization of a magnet, and FIG. 3 is a view showing a magnetic flux generated by a voice coil;

fig. 4 is a schematic view of an embodiment of a magnetic circuit system of a loudspeaker according to the present invention.

Detailed Description

The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the utility model are shown. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The technical solution of the present invention is described in various aspects with reference to the drawings and the embodiments.

Hereinafter, for convenience of description, the terms "left", "right", "up", "down", etc. will be referred to in the following description in accordance with the left, right, up, down, etc. directions of the drawings themselves.

With the development of the automobile manufacturing industry, the manufacturing technology of automobile loudspeaker parts is also developed. T iron, also called electrician iron, is the base of the loudspeaker, and the texture of the T iron is pure iron. The T-iron is an important component of the sound unit of the loudspeaker. In the sound unit, the main function of the T iron is to conduct magnetism under the condition of power-on, and after the loudspeaker is powered off, the magnetic field disappears, and the magnetism of the T iron also disappears immediately.

The problems existing in the existing T-shaped ferromagnetic circuit are as follows: the magnetic flux density distribution is not uniform. Within the magnetic gap, the magnetic flux density is uniform; and outside the magnetic gap, the magnetic flux density is reduced due to the increase of the magnetic resistance, and the descending speeds of the upper side and the lower side of the magnetic conduction plate are different due to the asymmetric shape of the magnetic circuit. At low frequency and large amplitude, the relative position of the voice coil to the magnetic gap is changed greatly, so that the average magnetic conductance of the magnetic material is changed, the inductance of the voice coil is influenced, and the current is distorted.

In one embodiment, as shown in fig. 1, the present invention provides a grooved magnetically permeable T-iron comprising a bottom plate 02 and a cylindrical magnetic conductor 01. The chassis 02 is connected with the magnetizer 01, and the chassis 02 is coaxial with the magnetizer 01. The upper end face of the magnetizer 01 is provided with a cylindrical groove 03, the central line of the cylindrical groove 03 is superposed with the central line of the magnetizer 01, and the difference between the diameter ∅ A of the magnetizer 01 and the diameter ∅ B of the cylindrical groove 03 is more than or equal to twice the thickness of the chassis 02.

The principle of the electric loudspeaker is that an electrified coil is stressed to move in a magnetic field to drive a cone to vibrate so as to make a sound, so that the loudspeaker needs a stable and uniform magnetic field, and the magnetic circuit system is used for providing a stable and uniform magnetic field for a voice coil. The current blocking effect of the speaker is due in part to the inductance of the voice coil. Due to the existence of the T iron column, the voice coil is equivalent to an inductance with iron cores. Since the permeability of the core changes with the applied current, the inductance of the voice coil is non-linear, causing non-linear distortion.

Since the magnet itself has a magnetic structure with a hysteresis loop due to distortion caused by the permeability of the magnetic material itself constituting the magnetic circuit, as shown in fig. 2, for the speaker, the permanent magnet is formed as a large bias-like direct-current magnetic field, and the change in the magnetic field caused by the audio current is considerably small, and this change in the alternating-current magnetic field forms a small hysteresis loop, with the result that the audio current is distorted.

The distortion of the audio current may be different due to the difference in the place where the magnetic flux passes, as shown in fig. 3. The magnetic pole around the voice coil and near the magnetic conductive plate Φ a are mainly distorted by the third harmonic, and the magnetic flux Φ B passing through the magnet is mainly distorted by the second harmonic. In order to reduce the distortion, the deep cylindrical groove is added on the upper end surface of the magnetizer 01 to saturate the magnetizer, a magnetic flux uniform distribution area is created as large as possible, the voice coil works in the magnetic flux uniform distribution area, and the third harmonic distortion caused by the non-uniform magnetic flux distribution can be effectively solved.

The magnetic conduction T iron with the groove can enable the T iron to enter a magnetic saturation state in advance, reduces the nonlinearity of inductive reactance, enables a vibration system to be always in a uniform magnetic field to do reciprocating motion in the vibration process, and can meet the requirement of customers on the distortion of a high-performance loudspeaker; and under the same conditions, the weight is reduced.

The magnetic conduction T iron with the groove has the advantages of simple structure, easy manufacture and low cost. The magnetic T iron with the groove can be used in various sound systems, and is widely applied to product development at present, particularly to medium and low-pitch loudspeakers.

In one embodiment, the depth of the cylindrical recess 03 is the same as the thickness of the mating magnetic steel. The outer surfaces of the chassis 02 and the magnetizer 01 are provided with zinc plating layers. The bottom of the chassis 02 is provided with a groove 04. The chassis 02 and the magnetizer 01 are integrally formed.

As shown in fig. 4, the present disclosure provides a magnetic circuit system of a speaker, which includes an upper plate 2, a magnetic steel 3, and a magnetic conductive T-iron 1 with a groove in any of the embodiments described above. As shown in FIG. 4, if the thickness of the bottom plate (chassis 02) of the T iron is T, ∅ A- ∅ B is more than or equal to 2T, the depth of the groove is the same as or close to the thickness of the magnetic steel 3, the magnetic flux can be distributed uniformly as much as possible, and the distortion can be reduced.

In the magnetic T-iron with the groove and the magnetic circuit system of the loudspeaker in the embodiment, the deep cylindrical groove is additionally arranged on the upper end surface of the magnetizer 01, so that the T-iron can enter a magnetic saturation state in advance, the nonlinearity of inductive reactance is reduced, the vibration system is always in a uniform magnetic field to do reciprocating motion in the vibration process, and the requirement of customers on the distortion of a high-performance loudspeaker can be met; not only can reduce speaker distortion, improve high frequency response, can also alleviate T iron weight, practice thrift the cost, can make the small and exquisite pleasing to the eye of outward appearance of speaker, accomplished the lightweight simultaneously, make the speaker performance outstanding more, improved product quality.

Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.

If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.

Meanwhile, if the utility model as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated. Any part provided by the utility model can be assembled by a plurality of independent components or can be manufactured by an integral forming process.

Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the utility model or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the utility model as defined by the appended claims.

Claims (6)

1. The utility model provides a magnetic conduction T iron with recess which characterized in that includes:

a chassis and a cylindrical magnetizer; the chassis is connected with the magnetizer and is coaxial with the magnetizer; a cylindrical groove is formed in the upper end face of the magnetizer, and the center line of the cylindrical groove is overlapped with the center line of the magnetizer; wherein a difference between a diameter ∅ A of the magnetizer and a diameter ∅ B of the cylindrical recess is greater than or equal to twice a thickness of the base plate.

2. The magnetically permeable T-iron of claim 1, wherein:

the depth of the cylindrical groove is the same as the thickness of the matched magnetic steel.

3. The magnetically permeable T-iron of claim 1, wherein:

the outer surfaces of the chassis and the magnetizer are provided with zinc plating layers.

4. The magnetically permeable T-iron of claim 1, wherein:

the bottom of the bottom plate is provided with a groove.

5. The magnetically permeable T-iron of claim 1, wherein:

the chassis and the magnetizer are integrally formed.

6. A magnetic circuit system for a speaker, comprising:

comprises an upper clamping plate, magnetic steel and the grooved magnetic T iron as claimed in any one of claims 1 to 5.

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