WO2012163003A1

WO2012163003A1 - Dynamic electroacoustic transducer

Info

Publication number: WO2012163003A1
Application number: PCT/CN2011/080780
Authority: WO
Inventors: 王建建; 张成飞; 葛连山; 刘春发
Original assignee: 歌尔声学股份有限公司
Priority date: 2011-05-31
Filing date: 2011-10-14
Publication date: 2012-12-06
Also published as: CN202068566U

Abstract

The present invention provides a strip-shaped dynamic electroacoustic transducer, comprising: a vibration system, the vibration system comprising a diaphragm and a drive member combined with the diaphragm, the drive member comprising a voice coil tube and a voice coil support supporting the voice coil tube; a magnetic circuit system formed by combining a washer, a magnet and a cone frame from top to bottom; a housing for accommodating and fixing the vibration system and the magnetic circuit system; dampers disposed at two ends of the voice coil support respectively. The middle of the damper is provided with a first fixing portion, the edge of the damper is provided with a second fixing portion. The first fixing portion is fixed on the voice coil support. The second fixing portion is fixed on the housing. In the present invention, the damper is directly disposed between the drive member of the magnetic circuit system and the housing, so as to achieve a better effect of preventing polarization , thereby further improving the acoustic performance of the dynamic electroacoustic transducer.

Description

Moving coil electroacoustic converter

The present invention relates to the field of electroacoustic conversion technology, and more particularly to a moving coil type electroacoustic transducer.

With the development of end-consumer electronic products, more and more electro-acoustic transducers, especially moving coil electroacoustic transducers, have been widely used. It is known that the sounding principle of a moving coil type electroacoustic transducer is that a voice coil having an alternating current signal is vibrated in a magnetic field, and a diaphragm combined with a voice coil is driven by the vibration of the voice coil to realize electroacoustic conversion. However, when a current flows through the voice coil, a magnetic field having the same frequency as the audio signal is generated around the voice coil, and the magnetic field generated by the voice coil interacts with the magnetic field generated by the magnetic circuit system to cause the voice coil to deviate. Vibration in the vertical direction, resulting in polarization, causing distortion and distortion of the vibration system, making the vibration system unstable.

At present, in order to ensure the thinning of the design of the terminal product, the moving coil type electroacoustic converter which is applied to a thin electronic product such as an LCD or a PDP is generally designed to have a long strip shape. For the speaker of such a long strip structure of thin electronic products, the following two design schemes are disclosed in the prior art:

One is by providing a sheet-like metal piece that is centered by mechanical bending. However, the centering piece of this mechanical structure has poor design stability and a poor centering effect.

The other is to combine the elastic wave between the diaphragm and the middle casing. This design can realize the anti-polarization effect to a certain extent, but the moving coil type electroacoustic converter for the long-shaped structure In other words, the closer to the middle position, the weaker the polarization reaction, so the elastic wave combined between the diaphragm and the intermediate casing does not fundamentally solve the problem of polarization prevention.

Therefore, it is necessary to further improve the above-described conventional structure of the moving coil type electroacoustic transducer to avoid the above drawbacks.

technical problem

The technical problem to be solved by the invention is: for a moving coil type electroacoustic transducer with a long strip structure, a movable coil type electroacoustic transducer design capable of realizing a better anti-polarization effect is provided, and the moving coil type electroacoustic conversion is improved. Vibration performance of the device.

Technical solution

In order to solve the above technical problem, the present invention provides a long moving coil type electroacoustic transducer, comprising:

a vibration system including a diaphragm and a driving portion coupled to the diaphragm, the driving portion including a voice coil cylinder and a voice coil holder supporting the voice coil cylinder;

a magnetic circuit system comprising a top-down combination of a washer, a magnet and a basin; and

a housing for receiving the vibration system and the magnetic circuit system;

The moving coil type electroacoustic converter further includes:

Elastic waves, the elastic waves are respectively disposed at both ends of the voice coil holder, and a first fixing portion is disposed at a middle portion of the elastic wave, and a second fixing portion is disposed at an edge of the elastic wave The first fixing portion is fixed to the voice coil holder, and the second fixing portion is fixed to the outer casing.

Preferably, the two ends of the voice coil bracket protrude to the outside of the magnetic circuit system, and the voice coil cylinder is sleeved on a lower portion of the voice coil bracket, and the first fixing of the elastic wave The portions are fixed at both ends of the bottom of the voice coil holder.

Preferably, the voice coil cylinder is sleeved on a lower portion of the voice coil bracket, and the upper portion of the voice coil bracket is provided with two extension portions extending to the outside of the voice coil cylinder, the elastic wave The first fixing portion is fixed to the two extension portions.

Preferably, a fixing post is respectively disposed on both ends of the bottom of the voice coil bracket, and an end of the fixing post is coupled with the first fixing portion of the elastic wave.

Preferably, the elastic wave is annular, the first fixing portion is a mounting hole disposed at the center of the elastic wave; and the second fixing portion is a plane mounting disposed at the edge of the elastic wave unit.

Among them, a preferred solution is that the outer contour of the elastic wave is circular or racetrack type.

Among them, a preferred embodiment is that the cross section of the elastic wave is wavy.

Preferably, an opening is provided at a position corresponding to the elastic wave mounting at the bottom of the outer casing.

Preferably, the elastic waves are bonded and fixed to the outer casing and the voice coil bracket, respectively. Among them, a preferred solution is that the magnetic circuit system includes two separate parts.

Beneficial effect

With the above-described elongated moving coil type electroacoustic transducer according to the present invention, polarization is effectively prevented by providing elastic waves at both ends of the voice coil holder supporting the voice coil cylinder. Since the middle portion of the elastic wave is provided with the first fixing portion and the edge is provided with the second fixing portion, the first fixing portion is fixed on the voice coil bracket, and the second fixing portion is fixed on the outer casing, so the design directly sets the elastic wave Between the driving part of the magnetic circuit system and the outer casing, a better anti-polarization effect can be achieved, and the acoustic performance of the moving coil type electroacoustic transducer is further improved.

In order to achieve the above and related ends, one or more aspects of the present invention include the features which are described in detail below and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail However, these aspects are indicative of only some of the various ways in which the principles of the invention may be employed. Furthermore, the invention is intended to cover all such aspects and their equivalents.

DRAWINGS

Other objects and results of the present invention will become more apparent and appreciated from the <RTIgt; In the drawing:

1 is a schematic exploded view showing the structure of a moving coil type electroacoustic transducer according to Embodiment 1 of the present invention;

Figure 2 is a cross-sectional view showing a moving coil type electroacoustic transducer according to a first embodiment of the present invention;

Figure 3 is a partial enlarged view of a portion A of Figure 2;

4 is a plan view of a bomb wave according to Embodiment 1 of the present invention;

Figure 5 is a schematic view showing the assembly of the elastic wave and the driving portion according to the first embodiment of the present invention;

Figure 6 is a cross-sectional view showing a moving coil type electroacoustic transducer according to a second embodiment of the present invention;

Figure 7 is a partial enlarged view of a portion B of Figure 6;

Figure 8 is a schematic view showing the assembly of the voice coil holder and the elastic wave according to the second embodiment of the present invention;

Fig. 9 is a plan view showing a bomb wave according to a third embodiment of the present invention.

In the figure: 11-diaphragm; 12, 12'-voice coil bracket; 121, 121'-positioning column; 122'-two extensions; 13-voice coil cylinder; 2, 2'-elastic wave; 21, 21' - first fixing portion; 22, 22' - second fixing portion; 31 - washer; 32 - magnet; 33 - basin; 4-shell; 41 - opening, 5-circuit board.

The same reference numerals are used throughout the drawings to refer to the

Embodiments of the invention

Specific embodiments of the present invention will be described in detail below with reference to the drawings.

In the following description, some exemplary embodiments of the present invention are described by way of illustration, and no one of ordinary skill in the art The described embodiments are modified in a variety of different ways. The drawings and the description are to be regarded as illustrative and not restrictive In addition, in the present specification, the same reference numerals denote the same parts.

Embodiment 1:

1 to 5 respectively show an exploded, combined and partial structure of a moving coil type electroacoustic transducer according to a first embodiment of the present invention.

As shown in FIG. 1 to FIG. 5, similar to the conventional moving coil type electroacoustic transducer, the long moving coil type electroacoustic transducer provided by the present invention also includes a vibration system, a magnetic circuit system, and a fixed vibration system. The outer casing 4 of the magnetic circuit system. Wherein, the vibration system includes a diaphragm 11 and a driving portion combined with the diaphragm 11, the driving portion includes a voice coil cylinder 13 and a voice coil holder 12 supporting the voice coil cylinder 13; the magnetic circuit system includes a top-down combination Huashi 31, magnet 32 and basin frame 33. The basin frame 33 is a slotted structure with open ends, the two ends of the voice coil holder 12 projecting to the outside of the magnetic circuit system, and the voice coil cylinder 13 is sleeved on the lower part of the voice coil holder 12.

In addition, elastic waves 2 are respectively disposed at two ends of the voice coil holder 12, and a first fixing portion 21 is disposed in a middle portion of the elastic wave 2 and a second fixing portion 22 is disposed at an edge thereof, respectively disposed at both ends of the voice coil holder 12. The first fixing portion 21 of the two elastic waves is fixed on both ends of the bottom of the voice coil holder 12, and the second fixing portion 22 is fixed on the outer casing 4, and both are bonded and fixed. This fixing method is relatively easy to realize in production practice. With the above design, the elastic wave 2 is disposed at both ends of the bottom of the driving portion, and the voice coil holder 12 of the driving portion is fixed relative to the outer casing by the elastic wave 2, so that the sound supported on the voice coil holder 12 is supported. The ring 13 does not vibrate from the vertical direction due to the action of the magnetic field when the current passes, achieving a better anti-polarization effect.

In the implementation process, the outer contour of the elastic wave 2 is preferentially circular, the elastic wave of the circular structure is evenly distributed, and the polarization prevention performance is more stable. Further, the elastic wave 2 is annular and has a wave-shaped cross section. The first fixing portion 21 is a mounting hole provided at the center of the elastic wave 2, and the second fixing portion 22 is a flat mounting portion provided at the edge of the elastic wave 2. In addition, a fixing post 121 may be respectively disposed on both ends of the bottom of the voice coil bracket 12, and the end of the fixing post 121 is inserted into the first fixing portion to facilitate the installation of the elastic wave.

In addition, at the bottom of the outer casing 4 corresponding to the position where the elastic wave 2 is mounted, an opening 41 is further provided for correspondingly accommodating the elastic wave 2 to provide space for the vibration of the elastic wave to avoid collision. The size of the opening 41 can be preset according to the actual production design.

In addition, in the implementation process, the magnetic circuit system includes two independent parts. This design can separately process the magnetic circuit system, which is convenient for simplifying the production process.

Embodiment 2:

6 to 8 show a combination and a partial structure of a moving coil type electroacoustic transducer according to Embodiment 2 of the present invention.

As shown in FIG. 6 to FIG. 8, the moving coil type electroacoustic transducer of the second embodiment also includes a vibration system, a magnetic circuit system, and a casing 4 that houses the fixed vibration system and the magnetic circuit system. Wherein, the vibration system includes a diaphragm 11 and a driving portion combined with the diaphragm 11, the driving portion including a voice coil cylinder 13 and a voice coil holder 12' supporting the voice coil cylinder 13; the magnetic circuit system includes a top-down combination The washer 31, the magnet 32 and the basin frame 33, the basin frame 33 is a slotted structure with open ends, the two ends of the voice coil bracket 12' project to the outside of the magnetic circuit system, and the voice coil cylinder 13 is sleeved on the voice coil. The lower portion of the bracket 12'.

The main difference between the second embodiment and the first embodiment is that the structure of the voice coil holder 12' is different. The voice coil tube 13 is sleeved on the lower part of the voice coil holder 12', and the upper portion of the voice coil holder 12' is extended to the voice coil tube. 13 outside the two extensions 122', the two extensions 122' are provided with a fixed column 121', corresponding to the installation of the elastic wave 2.

In the second embodiment of the present invention, the elastic wave is disposed on the outer side of the voice coil cylinder, and is not mounted on the upper and lower sides of the voice coil cylinder. Based on the same technical effects of the first embodiment, the second embodiment is implemented according to the second embodiment. The product does not need to consider the space required for the elastic wave installation and vibration in the vertical direction, thereby reducing the product height of the moving coil type electroacoustic transducer, compared with the setting of the elastic wave in the voice coil cylinder in the first embodiment. On the inner side, the application effect of the second embodiment is better.

Embodiment 3:

As shown in FIG. 9, the main difference between the third embodiment and the first embodiment is that the structure of the elastic wave is different. In the third embodiment, the elastic wave 2' is a racetrack type structure, wherein the first fixed portion 21' is A circular mounting hole is provided at the center of the track type elastic wave 2', and the second fixing portion 22' is a plane mounting portion provided at the racetrack type edge of the track type elastic wave 2'.

The design of the racetrack type structure is more conducive to the thinning of the product design than the circular elastic wave structure, and further reduces the product size of the moving coil type electroacoustic transducer.

In the above embodiment, the side wall of the outer casing 4 is further provided with a circuit board 5 for electrical connection. In addition, in the specific implementation process of the present invention, the basin frame may also be a closed structure, and the invention is further designed by extending the voice coil bracket to the outside of the magnetic circuit; the elastic wave may also be in other shapes, or may be in other manners. Fixing with the voice coil bracket and the outer casing; the first fixed portion of the elastic wave can also be flexibly set to an elliptical shape, a racetrack type, etc. according to the structure of the corresponding voice coil bracket to facilitate fixing the shape of the voice coil bracket and the elastic wave; Neither affects the implementation of the inventive creation.

The basic principles, main features and advantages of the present invention are shown and described above in conjunction with the drawings. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments. For the long moving coil type electroacoustic transducer proposed by the present invention, the present invention can be carried out without departing from the spirit and scope of the present invention. There will be various changes and modifications which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and their equivalents.

Claims

A long strip type moving coil type electroacoustic converter comprising:

a vibration system including a diaphragm and a driving portion coupled to the diaphragm, the driving portion including a voice coil cylinder and a voice coil holder supporting the voice coil cylinder;

a magnetic circuit system comprising a top-down combination of a washer, a magnet and a basin; and

a housing for receiving the vibration system and the magnetic circuit system;

The moving coil type electroacoustic converter further includes:

Elastic waves, the elastic waves are respectively disposed at both ends of the voice coil holder, and a first fixing portion is disposed at a middle portion of the elastic wave, and a second fixing portion is disposed at an edge of the elastic wave The first fixing portion is fixed to the voice coil holder, and the second fixing portion is fixed to the outer casing.
A moving coil type electroacoustic transducer according to claim 1, wherein:

Two ends of the voice coil holder protrude to the outside of the magnetic circuit system, the voice coil cylinder is sleeved on a lower portion of the voice coil holder, and the first fixing portion of the elastic wave is fixed to the voice coil Both ends of the bottom of the bracket.
A moving coil type electroacoustic transducer according to claim 1, wherein:

The voice coil cylinder is sleeved on a lower portion of the voice coil bracket, and an upper portion of the voice coil bracket is provided with two extending portions extending to the outside of the voice coil cylinder, and the first fixing portion of the elastic wave is fixed at the On the two extensions.
A moving coil type electroacoustic transducer according to any one of claims 1 to 3, characterized in that:

Fixing posts are respectively disposed on both ends of the bottom of the voice coil holder, and the ends of the fixing posts are combined with the first fixing portion of the elastic wave.
A moving coil type electroacoustic transducer according to claim 4, wherein:

The elastic wave is annular, the first fixing portion is a mounting hole disposed at the center of the elastic wave, and the second fixing portion is a planar mounting portion disposed at an edge of the elastic wave.
A moving coil type electroacoustic transducer according to claim 5, wherein:

The outer contour of the elastic wave is circular or racetrack type.
A moving coil type electroacoustic transducer according to claim 6, wherein:

The cross section of the elastic wave is wavy.
A moving coil type electroacoustic transducer according to claim 1, wherein:

An opening is provided at a bottom of the outer casing corresponding to the position at which the elastic wave is mounted.
A moving coil type electroacoustic transducer according to claim 1, wherein:

The elastic waves are bonded and fixed to the outer casing and the voice coil bracket, respectively.
A moving coil type electroacoustic transducer according to claim 1, wherein:

The magnetic circuit system includes two separate parts.