CN204442664U - Microspeaker - Google Patents

Abstract

The utility model discloses a miniature loudspeaker, which relates to the technical field of electroacoustic products, and comprises a magnetic circuit system, a vibration system and a front cover as an auxiliary system. The magnetic circuit system includes a central magnetic circuit and a surrounding magnetic circuit, and the central magnetic circuit includes a central magnet. And the center washer, the surrounding magnetic circuit includes a ring magnet and a ring washer, the vibration system includes a diaphragm and a voice coil, a through hole is provided on the front cover as a sound channel, and the space on the side of the diaphragm close to the magnetic circuit system forms a rear acoustic cavity , the corners of the ring-shaped washer are provided with openings to form the sound channel of the rear acoustic cavity, and the position of the ring magnet corresponding to the opening is provided with an avoidance corner formed by material removal to avoid the opening. The miniature loudspeaker of the utility model can solve the problem of sound production when the product is working, increase the loudness, and at the same time increase the volume of the magnetic circuit, so that the performance of the product is more optimized.

Description

micro speaker

technical field

The utility model relates to the field of electroacoustics, in particular to a miniature loudspeaker.

Background technique

A micro speaker is a transducer device that converts electrical signals into acoustic signals. It is widely used in terminal equipment such as personal computers, children's toys, PDAs, and MP3s. It is an important component that affects the sound reproduction effect of terminal products. With the rapid development of the information industry and the electronics industry, especially consumers' constant pursuit of light weight, miniaturization and high performance of consumer electronics and communication equipment, how to optimize the product as much as possible without increasing the thickness of the micro speaker product Performance has become an important technical topic.

In the existing micro-speakers, the sound channel of the rear acoustic cavity is generally arranged on the casing, but the casing in the prior art is generally formed by injection molding, and the wall is relatively thick, which limits the overall size of the product, and the increase of the volume of the magnetic circuit will As a result, the sound hole is reduced, which causes the sound of the micro-speaker to be unsmooth. Therefore, it is necessary to improve the design of the existing micro-speaker sound channel to ensure the sound effect of the micro-speaker while increasing the magnetic circuit.

Utility model content

In view of the above problems, the technical problem to be solved by the utility model is: to provide a micro-speaker with high sensitivity and good sound effect, through the improvement of the overall structure of the product and the adjustment of the sound hole design, the volume of the magnetic circuit is increased, At the same time, the loudness of the micro speaker product is increased.

In order to solve the above problems, the technical solution of the utility model is:

A miniature loudspeaker, including a magnetic circuit system, a vibration system and a front cover as an auxiliary system; the magnetic circuit system includes a central magnetic circuit and a surrounding magnetic circuit; the central magnetic circuit includes a central magnet and a central washer; the surrounding The magnetic circuit includes a ring magnet and a ring washer; the vibration system includes a diaphragm and a voice coil, wherein a through hole is provided on the front cover as a sound channel; the side of the diaphragm close to the magnetic circuit system The space forms the rear acoustic cavity; the corner of the ring-shaped washer is provided with openings to form the sound channel of the rear acoustic cavity; the position of the ring magnet corresponding to the opening is provided with an avoidance corner formed by removing material, avoiding the opening.

Wherein, the ring-shaped washer includes a main body of an annular hollow structure and extensions parallelly extending outward from four corners of the main body; the openings are located at the corners of the main body.

Wherein, a supporting shell is provided between the annular washer and the diaphragm; the supporting shell includes four side walls; the four side walls encircle and form a ring-shaped hollow area; the supporting shell The side wall is fixed to the extension of the annular washer; the aperture of the hollow annular area of the supporting shell is larger than the aperture of the main body of the annular washer, and the orthographic projection of the opening at least partially falls into the supporting shell within the range of the orthographic projection of the hollow annular region of the body.

Wherein, the supporting shell is made of metal material.

Wherein, the magnetic circuit system is fixed on the magnetic conductive plate; the magnetic conductive plate is a planar structure extending in the horizontal direction.

Wherein, the diaphragm includes a middle part and a ring part arranged around the middle part; a reinforcing part is combined on the upper side of the middle part; a centering part is arranged between the diaphragm and the reinforcing part strut; the centering strut includes an inner support part located on the inside, an outer support part located on the outside, and a protrusion extending from the outer support part to the outside of the loudspeaker; the inner support part and the outer support part An elastic support arm is arranged around the gap; an internal pad is provided at the middle position of the left and right ends of the inner support part, and is electrically connected with the lead wire of the voice coil; an external pad is provided on the protruding part, and The external circuit is electrically connected.

Wherein, the corners of the centering strut are provided with positioning holes, the corresponding positions of the supporting shell are provided with positioning columns, the supporting shell is fixed with the centering strut, and the corners of the diaphragm The part is correspondingly provided with an avoidance structure for avoiding the positioning column and the positioning hole.

Wherein, the diaphragm has a downward depression, and the inner and outer edges are respectively fixed to the inner support part and the outer support part of the damper; the reinforcing part is connected to the inner support part of the damper Combination; the voice coil is bonded to the lower side of the middle part of the diaphragm.

Wherein, the surrounding magnetic circuit is arranged on the outer periphery of the central magnetic circuit and is arranged at a certain distance from the central magnetic circuit to form a magnetic gap; the end of the voice coil is suspended in the magnetic gap.

Wherein, the front cover is connected to the outer support portion of the damper.

After adopting above-mentioned technical scheme, the beneficial effect of the utility model is:

Due to the micro-speaker of the utility model, the space on the side of the diaphragm close to the magnetic circuit system forms a rear acoustic cavity, and the corner of the ring-shaped washer is provided with an opening, which is used as the sound channel of the rear acoustic cavity, so that the micro-speaker product can be heard when it is working. The sound is smooth, which can increase the loudness of the product; corresponding to the ring magnet fixed to the ring washer, there is an avoidance corner formed by material removal to avoid the opening for sound, which can prevent the sound channel of the rear sound chamber from being blocked. The ring magnet is blocked to ensure its smooth sound.

Due to the micro-speaker of the present utility model, a supporting shell is arranged between the annular washer and the diaphragm, and the supporting shell plays a supporting role on the diaphragm, and is used to limit the distance between the diaphragm and the magnetic circuit system; in addition, the support The four side walls of the shell form an annular hollow area, the aperture of the hollow annular area is larger than the aperture of the annular Washer body, and the orthographic projection of the opening at least partly falls within the orthographic range of the hollow annular area of the supporting shell, preventing When the supporting shell is assembled with the annular washer, the opening is completely blocked by the side wall of the supporting shell.

In the present invention, the supporting shell is made of metal material, which is easier to be thinned than other materials, and meets consumers' needs for thinning loudspeaker products.

In the utility model, the auxiliary system of the micro-speaker is no longer equipped with a shell structure, which solves the problem of restricting the overall size of the product due to the excessive thickness of the shell wall; Compared with the existing basin frame design including the side wall structure, it provides a larger accommodating space for the magnetic circuit system, can further increase the volume of the magnetic circuit of the product, and improve the performance of the micro-speaker.

Since there is a centering strut between the diaphragm and the reinforcing part, the structure of the voice coil can be positioned to prevent the polarization of the voice coil during the vibration process; The lead wires of the speaker are electrically connected, and an external pad is provided on the protruding part extending to the outside of the speaker, so that the electrical connection with the external circuit can be realized. The corners of the centering strut are provided with positioning holes, and the corresponding positions of the supporting shell are provided with positioning columns, the supporting shell is fixed with the centering strut, and the corners of the diaphragm are correspondingly provided with avoidance positioning columns and positioning holes The avoidance structure can successfully complete the positioning of the centering piece and the supporting shell.

In the utility model, the strut is arranged between the reinforcement part and the diaphragm, and the strut is located above the diaphragm, and the diaphragm has a downward depression, and this structural design also has the effect of reducing the thickness of the product.

To sum up, the micro-speaker of the utility model, on the one hand, increases the volume of the magnetic circuit and improves the performance of the product by improving the overall structure of the product; The invention solves the sound problem of the micro-speaker, increases the loudness of the product, and is suitable for popularization and application in the field of loudspeakers and other related industries.

Description of drawings

Fig. 1 is the appearance diagram of the back of the product of the utility model miniature loudspeaker;

Fig. 2 is a schematic diagram of the front appearance of the product of the utility model micro-speaker;

Fig. 3 is an exploded view of the micro-speaker of the present invention after removing the front cover structure;

Fig. 4 is an oblique cross-sectional view of the utility model micro-speaker along the diagonal direction;

Fig. 5 is the exploded diagram of the magnetic circuit structure of the miniature loudspeaker of the present invention;

Fig. 6 is a sectional view of the utility model micro-speaker magnetic circuit structure;

The reference signs include: 1, center magnet, 2, center washer, 3, ring magnet, 4, ring washer, 41, body part, 42, extension part, 5, opening, 6, avoiding missing corner, 7. Support shell, 71, side wall, 72, positioning column, 8, diaphragm, 81, middle part, 82, ring part, 83, avoidance structure, 9, reinforcing part, 10, voice coil, 11, Centering piece, 111, inner support part, 112, outer support part, 113, support arm, 114, positioning hole, 115, protruding part, 116, internal welding pad, 117, external welding pad, 12, front cover, 121 , through hole, 13, magnetically conductive plate, AA', the sound channel of the rear acoustic cavity.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, further set forth the utility model.

Example:

As shown in Fig. 1-Fig. 5 together, the miniature loudspeaker of the present utility model comprises magnetic circuit system, vibration system and the front cover 12 as auxiliary system, and magnetic circuit system comprises central magnetic circuit and surrounding magnetic circuit, and central magnetic circuit comprises center The magnet 1 and the center washer 2, the surrounding magnetic circuit includes the ring magnet 3 and the ring washer 4, and the vibration system includes the diaphragm 8 and the voice coil 10. As shown in Figure 4, the front cover 12 is provided with a through hole 121 as a sound channel, the space on the side of the diaphragm close to the magnetic circuit system forms a rear acoustic cavity, and the corner of the ring-shaped washer 4 is provided with an opening 5 to form a rear cavity. In the sound channel AA' of the acoustic chamber, the position of the ring magnet 3 corresponding to the opening 5 is provided with an avoidance notch 6 to avoid the opening 5 .

During assembly, the ring magnet 3 and the ring washer 4 surround the outer circumference of the center magnet 1 and the center washer 2 respectively and set a certain distance to form a magnetic gap. The voice coil 10 is bonded and fixed to the lower side of the middle part 81 of the diaphragm, And the end is suspended in the magnetic gap. When the coil of the voice coil 10 receives electrical signals of different sizes and directions, the voice coil 10 will reciprocate and cut the magnetic field lines in the magnetic gap, driving the fixed diaphragm Vibration, the sound waves generated by the vibration of the diaphragm can be transmitted to the outside of the product through AA', thereby instigating the air to make sound, and finally converting the electrical signal into an acoustic signal to complete the conversion between electro-acoustic energy.

Through the above technical solution, the opening 5 is set at the corner of the annular washer 4 as the sound channel of the rear sound chamber, which can solve the sound problem of the dual magnetic circuit micro-speaker and increase the loudness of the product.

As shown in FIG. 5 , preferably, the annular washer 4 includes a body portion 41 of an annular hollow structure and extension portions 42 parallelly extending outward from the four corners of the body portion 41 ; the openings 5 are located at the corners of the body portion 41 department.

As shown in Figure 5, preferably, a supporting shell 7 is provided between the ring-shaped washer 4 and the diaphragm 8 for supporting the diaphragm 8 and limiting the distance between the diaphragm 8 and the magnetic circuit system; the supporting shell 7 It includes four side walls 71, and the four side walls 71 encircle and form an annular hollow area; the side walls 71 of the support shell 7 are glued and fixed with the extension part 42 of the annular washer 4; the hole diameter of the hollow ring area of the support shell 7 is larger than The aperture of the annular washer body 41 and the orthographic projection of the opening 5 at least partly fall within the range of the orthographic projection of the hollow annular area of the supporting shell 7. When the supporting shell 7 is assembled with the annular washer 4, the opening 5 It will not be blocked by the side wall 71 of the supporting shell 7, which can ensure smooth sound from the opening 5.

Preferably, the supporting shell 7 is made of metal material, which is easy to be thinned and meets the requirement of thinning the product.

Preferably, the magnetic circuit system is fixed on the magnetically conductive plate 13, and the magnetically conductive plate 13 is a rectangular flat plate structure, which provides a larger accommodation space for the magnetic circuit system, facilitates the increase of the magnetic circuit volume, and optimizes the magnetic properties of the micro-speaker. able.

As shown in Figures 1-4, the diaphragm 8 includes a middle part 81 and a ring part 82 surrounding the outer periphery of the middle part 81. The upper side of the middle part 81 is combined with a reinforcing part 9, and the diaphragm 8 and the reinforcing part A damper 11 is arranged between 9 for positioning the voice coil 10 and preventing the voice coil 10 from being polarized. The damper 11 includes an inner support part 111 located on the inner side, an outer support part 112 located on the outer side, and a protruding part 115 extending from the outer support part 112 to the outside of the loudspeaker, and the gap between the inner support part 111 and the outer support part 112 is arranged around Elastic support arm 113. The support part 111 of the damper is provided with an internal pad 116, which is electrically connected with the lead wire of the voice coil 10; the protruding part 115 is provided with an external pad 117, which is electrically connected with the external circuit, when the protruding part 115 receives the external circuit When an electric signal is used, it can be transmitted to the voice coil 10 electrically connected to the internal pad 116 through the strut 11 , so that the voice coil 10 is displaced under the action of the electromagnetic field, and the diaphragm 8 is driven to vibrate.

Preferably, the corner of the strut 11 is provided with a positioning hole 114, and the corresponding position of the supporting shell 7 is provided with a positioning column 72, and the supporting shell 7 and the strut 11 are positioned and combined through the positioning column 72 and the positioning hole 114, Since the diaphragm 8 is located between the support shell 7 and the strut 11, in order to successfully complete the assembly of the support shell 7 and the strut 11, the corners of the diaphragm 8 are correspondingly provided with avoidance positioning columns 72 and positioning pins. The escape structure 83 of the hole 114 .

Preferably, the diaphragm 8 has a downward depression, which reduces the thickness of the product. The inner and outer edges of the diaphragm 8 are respectively fixed to the inner support part 111 and the outer support part 112 of the damper 11, and the reinforcing part 9 is combined with the inner support part of the damper.

Preferably, the front cover 12 is connected to the outer support portion 112 of the damper 11 .

The above is only an implementation example of the utility model, and is not intended to limit the utility model, but any equivalent modification or change made by those of ordinary skill in the art based on the content disclosed in the utility model should be included in the scope of protection recorded in the claims Inside.

Claims (10)

1. A miniature loudspeaker, comprising a magnetic circuit system, a vibration system and a front cover as an auxiliary system; the magnetic circuit system comprises a central magnetic circuit and a surrounding magnetic circuit; the central magnetic circuit comprises a central magnet and a center washer; The surrounding magnetic circuit includes a ring magnet and a ring washer; the vibration system includes a diaphragm and a voice coil, and it is characterized in that: the front cover is provided with a through hole as a sound channel; the diaphragm is close to the magnetic circuit system The space on one side of the ring forms the rear acoustic cavity; the corner of the annular washer is provided with an opening to form the sound channel of the rear acoustic cavity; the position of the ring magnet corresponding to the opening is provided with an avoidance formed by removing material Notched corners, avoiding said openings. 2. The micro-speaker according to claim 1, characterized in that: the ring-shaped washer comprises a body part of a ring-shaped hollow structure and extension parts parallelly extending outward from the four corners of the body part; Openings are located at corners of the body portion. 3. The micro-speaker according to claim 1, characterized in that: a supporting shell is provided between the annular washer and the diaphragm; the supporting shell includes four side walls; the four sides The wall is surrounded to form an annular hollow area; the side wall of the supporting shell is fixed to the extension of the annular washer; the aperture of the hollow annular area of the supporting shell is larger than the aperture of the main body of the annular washer, so The orthographic projection of the opening at least partially falls within the range of the orthographic projection of the hollow annular area of the supporting shell. 4. The micro-speaker according to claim 3, wherein the supporting shell is made of metal material. 5 . The micro-speaker according to claim 1 , wherein the magnetic circuit system is fixed on a magnetically conductive plate; and the magnetically conductive plate is a planar structure extending in a horizontal direction. 5 . 6. The micro-speaker according to claim 1, characterized in that: the diaphragm comprises a middle part and a ring part arranged around the middle part; a reinforcing part is combined on the upper side of the middle part; A damper is provided between the diaphragm and the reinforcing part; the damper includes an inner support part located on the inner side, an outer support part located on the outer side, and a protrusion extending from the outer support part to the outside of the loudspeaker part; the gap between the inner support part and the outer support part is surrounded by an elastic support arm; the middle position of the left and right end sides of the inner support part is provided with an internal pad, which is electrically connected to the lead wire of the voice coil connection; the protruding part is provided with an external pad, which is electrically connected with the external circuit. 7. The micro-speaker according to claim 6, characterized in that: positioning holes are provided at the corners of the strut, and positioning columns are provided at the corresponding positions of the support shell, and the support shell and the support shell are The centering strut is fixed, and the corner of the diaphragm is correspondingly provided with an avoidance structure for avoiding the positioning post and the positioning hole. 8. The micro-speaker according to claim 6, characterized in that: the diaphragm has a downward depression, and the inner and outer edges are respectively fixed to the inner support part and the outer support part of the damper; The reinforcing part is combined with the inner supporting part of the damper; the voice coil is bonded to the lower side of the middle part of the diaphragm. 9. The miniature speaker according to claim 1, wherein the surrounding magnetic circuit is arranged on the outer periphery of the central magnetic circuit and is arranged at a certain distance from the central magnetic circuit to form a magnetic gap; the voice coil The ends of are suspended in the magnetic gap. 10. The micro-speaker according to claim 6, wherein the front cover is connected to the outer support portion of the damper.