CN201150128Y - micro sound device - Google Patents

Abstract

The utility model provides a miniature sound producing device, which comprises a vibrating system and a magnetic circuit system. The vibrating system comprises a voice coil and a vibrating diaphragm connected with the voice coil, and a magnet gap used for containing the voice coil is formed in the magnetic circuit system. The shape of the voice coil is composed of four straight segments and a camber line for smoothly connecting the four straight segments. Compared with the runway shaped and the rectangular voice coils existing in the prior art, the miniature sound producing device can enlarge the area of the magnetic circuit system and the effective radiating area of the vibrating diaphragm under the condition that the size of products can not be changed, to be in favor of enhancing the performance of the products; the inlet/outlet wires leaded out by the voice coil can be putted at the smooth camber line part, the binding force at the smooth camber line part is more firm, the position is more steady, and the voice coil can ensure the flatness of the four straight edges and the non-yielding ability during the later molding process and under the working state.

Description

micro sound device

technical field

The utility model relates to a sounding device, in particular to a miniature moving coil sounding device.

Background technique

Miniature sound generating devices are widely used in portable electronic devices such as mobile phones and notebook computers. With the rapid development of these portable electronic devices, people's functional requirements are getting stronger and stronger, and the miniature sound-generating devices applied to them are also developing correspondingly and rapidly.

The miniature moving coil type sounding device 2 of related structure is as shown in Figure 1, and it comprises lower casing 21 ', the magnetic bowl 22 ' that is contained in the lower casing 21 ', the permanent magnet 23 that is accommodated in the magnetic bowl 22 ' ', the voice coil 24' set in the magnetic gap formed by the permanent magnet 23' and the magnetic bowl 22', the diaphragm 25' connected to the voice coil 24', and the upper housing 26 covered on the lower housing 21' ' and the metal sheet 27' housed in the lower casing 21'. The voice coil 24' is electrically connected through the metal sheet 27'. When the alternating audio current is passed through, the voice coil 24' is subjected to alternating driving force in the magnetic gap, which produces an alternating motion and drives the diaphragm 25' to vibrate, thereby Make noise.

The voice coil 24' is wound by a metal enameled wire. In order to improve the performance of the product, the voice coil used in the relevant miniature dynamic sounding device generally adopts a racetrack shape or a rectangular shape.

The Chinese patent with the patent number "03222994.1" discloses a miniature moving coil sounding device. The shape of the magnetic gap formed by the internal voice coil and the magnetic circuit system is composed of two straight line segments and an arc smoothly connecting the two straight line segments. Composition, that is, the common track shape of sports venues. The miniature dynamic sounding device has the advantages of wide frequency, high power and low distortion. However, the area of the magnetic circuit system and the effective radiation area of the diaphragm can also be enlarged to improve the performance of the product without changing the size of the product itself.

Japanese Patent Publication No. "2006-26173939" discloses a manufacturing method of a miniature moving coil sounding device. The voice coil of the miniature moving coil sounding device manufactured by this method is rectangular. This invention is not easy to control the fastness and position of the incoming and outgoing lines of the voice coil, and objectively, the rectangular voice coil has a tendency to deform.

Therefore, it is necessary to improve the shape of the voice coil in the miniature dynamic sounding device and the magnetic circuit system matching the shape of the voice coil.

Utility model content

The technical problem to be solved by the utility model is to provide a micro-sounding device with good performance.

According to the above-mentioned technical problems to be solved, a micro-sounding device is designed, which includes a vibration system and a magnetic circuit system. The vibration system includes a diaphragm connected to the voice coil and the voice coil. The magnetic gap, the shape of the voice coil is composed of four straight line segments and an arc that smoothly connects the four straight line segments.

Compared with the existing track-shaped voice coil and its magnetic circuit system, the utility model can expand the area of the magnetic circuit system and the effective radiation area of the diaphragm while keeping the size of the product itself, so as to benefit the product Improved performance; Compared with the rectangular voice coil and its magnetic circuit structure, it has two advantages:

1) The incoming/outgoing wires leading out from the voice coil can be placed on a smooth arc, where the bonding force is stronger and the position is more stable;

2) Since there is an arc buffer at the position where the four straight lines are connected, the flatness of the four straight sides and the ability to not easily deform can be guaranteed in the subsequent molding process and working state of the voice coil.

Description of drawings

Fig. 1 is the three-dimensional exploded view of the miniature dynamic sounding device of related art;

Fig. 2 is the three-dimensional exploded view of the miniature sounding device of the present invention;

Fig. 3 is a three-dimensional exploded view of another viewing angle of the micro-sounding device of the present invention;

Fig. 4 is the three-dimensional combination diagram of the miniature sounding device of the present invention;

Fig. 5 is the cross-sectional view of the miniature sounding device of the present invention;

Fig. 6 is the front schematic view of the vibrating membrane in the micro-sounding device of the present invention;

Fig. 7 is a three-dimensional schematic diagram of the magnetic circuit system in the miniature sound generating device of the present invention. .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Fig. 2 to Fig. 7, the miniature sounding device 100 of the present invention includes a vibration system, a magnetic circuit system and an auxiliary system, wherein the vibration system includes a diaphragm 12 connected to the voice coil 11 and a magnetic circuit system. It includes a magnetic bowl 21 , a permanent magnet 22 and a pole piece 23 accommodated in the magnetic bowl 21 , and the auxiliary system includes a basin frame 31 , an upper cover 32 and a conductive piece 33 .

The voice coil 11 is wound by a continuous enamelled metal wire, and is provided with an incoming wire 111 and an outgoing wire 112. Located on the front side 113 of the voice coil 11 , the back side 114 of the voice coil 11 is connected with the diaphragm 11 by gluing. As shown in Figure 5, the shape of the voice coil 11 is composed of four straight line segments 11a, 11b, 11c, 11d and arcs 11e, 11f, 11g, 11h smoothly connecting the four straight line segments, the radius of the arc is 0.3mm , the angle is 90°, and its radius can also be 0.35mm, 0.38mm or 0.4mm.

The diaphragm 12 includes a planar dome 121 and a soft surround 122 with a planar center, wherein the planar dome 121 is located on the soft surround 122 . The diaphragm 12 is installed on the basin frame 31 through the positioning frame 123 which fixes the edge of the soft ring 122 . The shapes of the planar dome 121 and the soft surround 122 are correspondingly the same as those of the voice coil 11 .

The magnetic bowl 21 , the permanent magnet 22 and the pole pieces 23 accommodated in the magnetic bowl 21 form a magnetic gap 24 for accommodating the voice coil 11 . As shown in FIG. 6 , the magnetic gap 24 has the same shape as the voice coil 11 .

The basin frame 31 is a hollow cuboid, which is composed of an annular receiving hole 311 and a main body 312 surrounding the annular receiving hole 311 . The main body part 312 is provided with an upper surface 313 and a lower surface 314 opposite to the upper surface 313, and a tenon pin 315 is arranged on the inner surface of the main body part 312, and the magnetic bowl 21 is engaged with the tenon pin 315 by being provided with a mortise 212 on it. Installed in the receiving hole 311 of the basin frame 31 , the mouth of the magnetic bowl faces the upper surface 313 . The two opposite corners of the lower surface 314 of the main body are provided with locking slots 316 , and the four corners of the upper surface are respectively provided with four limit pieces 317 for fixing the upper cover.

The upper cover 32 is formed by punching a metal sheet, and it is provided with a sound hole 322 and a flat plate portion 321 surrounding the sound hole 322, and a buckling portion 323 extends outward from opposite ends of the flat plate portion 321, and the buckling portion 323 can be buckled. Hold on the limiting member 317 of the main body part 312.

The conductive sheet 33 is made of metal sheet, and one end is bent into a hook 331. The conductive sheet 33 is installed on the basin frame 31 by engaging the hook 331 with the slot 316 on the basin frame 31. The conductive sheet 33 is connected with the voice coil The incoming and outgoing wires of 11 are electrically connected.

In the micro-sounding device 100 of this structure, when the voice coil 11 is fed with an alternating audio current through the conductive sheet 33, the voice coil 11 is subjected to an alternating driving force in the magnetic gap 24 to generate an alternating motion, thereby driving the diaphragm 12 to vibrate ,Make noise.

The shape of the voice coil and the magnetic gap in the embodiment of the utility model are correspondingly the same, and both are composed of four straight segments and an arc smoothly connecting the four straight segments, which can expand the area of the magnetic circuit system while keeping the size of the product itself unchanged and the effective radiation area of the diaphragm, in order to improve the performance of the product; the inlet/outlet of the voice coil can be placed on a smooth arc, where the bonding force is stronger and the position is more stable, and the sound The ring can better ensure the flatness of its four straight sides and the ability not to deform in the subsequent forming process and working state.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, improvements can also be made without departing from the inventive concept of the utility model, but these All belong to the protection scope of the present utility model.

Claims (4)

1, a kind of miniature sound-generating device, it comprises vibration system, magnetic circuit system, described vibration system comprises the diaphragm that voice coil is connected with voice coil, and described magnetic circuit system is formed with the magnetic gap that accommodates voice coil, it is characterized in that: The shape of the voice coil is composed of four straight segments and an arc smoothly connecting the four straight segments. 2. The miniature sound-generating device according to claim 1, wherein the shape of the magnetic gap corresponds to the shape of the voice coil. 3. The miniature sound-generating device according to claim 1, wherein the radius of the arc connecting the four straight line segments smoothly is larger than 0.3mm. 4. The miniature sound-generating device according to claim 2, wherein the shape of the diaphragm corresponds to the shape of the voice coil.

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