CN201403191Y

CN201403191Y - Minitype acoustical generator

Info

Publication number: CN201403191Y
Application number: CN2009201301797U
Authority: CN
Inventors: 江文涛
Original assignee: AAC Acoustic Technologies Shenzhen Co Ltd; AAC Acoustic Technologies Changzhou Co Ltd
Current assignee: AAC Technologies Holdings Shenzhen Co Ltd; AAC Technologies Holdings Changzhou Co Ltd
Priority date: 2009-02-13
Filing date: 2009-02-13
Publication date: 2010-02-10
Anticipated expiration: 2019-02-13

Abstract

The utility model provides a minitype acoustical generator, which mainly comprises a base, a magnetic bowl embedded in the base, magnet steel contained in the magnetic bowl, a coil whose part is contained in a magnetic gap formed of the magnetic bowl and the magnet steel, diaphragm connected on one end of the coil and an upper cover which forms a containing cavity with the base and contains the components inside, wherein the base comprises a first surface, a second surface and a side wall which extends from the first surface to the second surface, the first surface of the base is provided witha first leaking part, the first leaking part comprises a first through hole which penetrates through the base, and a groove which does not penetrate through the base and extends to the side wall, andthe first through hole is located in the groove. The acoustical generator prevents the acoustics performance from being affected owing to the leaking part is sealed when users installing machines, thereby the acoustics performance of the minitype acoustical generator is stable.

Description

Minitype acoustic generator

Technical field

The utility model relates to a kind of minitype acoustic generator, relates in particular to a kind of minitype acoustic generator that is applied on the portable consumer electronic products such as mobile phone.

Background technology

Mini-sound device is widely used in portable electronic equipments such as mobile phone, notebook computer, hearing aids.Along with fast development, the people of these portable electronic equipments are more and more stronger to its functional requirement, the also corresponding development apace of the mini-sound device that is applied thereon.

The minitype acoustic generator of dependency structure mainly comprises as bowl-shape pedestal, joins with pedestal and be provided with the loam cake in hole, and pedestal and loam cake form a cavity volume.Be provided with in this cavity volume and be contained in the pedestal and link to each other with pole piece, with the vibrating diaphragm of loam cake adjacency, with vibrating diaphragm with permanent magnet that pedestal forms magnetic gap and be suspended in voice coil loudspeaker voice coil in the described magnetic gap, outside pedestal, be provided with the circuit board that realization links to each other with external circuit, the passing the hole that pedestal is provided with into and out of line and link to each other of voice coil loudspeaker voice coil with circuit board.When feeding the alternation tone currents on circuit board, voice coil loudspeaker voice coil is subjected to the motive force of alternation in magnetic gap, produces alternate motion, thereby drives the vibrating diaphragm vibration, sounds.

Please join Fig. 1 and Fig. 2, be depicted as a kind of Microspeaker 20 relevant with the utility model, this Microspeaker 20 comprise pedestal 21 and with the common loam cakes 22 that form host cavities of pedestal 21.Be embedded in magnetic bowl in the pedestal 21, be contained in magnet steel in the magnetic bowl, post the vibrating diaphragm that pole piece, part on magnet steel is contained in coil in the magnetic gap of magnetic bowl and magnet steel formation, is connected in coil one end, said elements is contained in the host cavity.

When feeding alternating current in the coil, the coil that is in the magnetic gap can be because the effect in magnetic field produces motion, and along with the variation of electric current, this motion also can change thereupon, thereby drives the vibrating diaphragm up-down vibration, causes the generation of sound.

In the vibrating diaphragm vibration processes, the air in the back cavity (space at vibrating diaphragm below or rear) can be compressed or expand, and therefore, needs on the pedestal 21 to offer leakage portion 201 so that the circulation of air.Leakage portion 201 is a circular hole.Yet this leakage portion 201 usually can be bigger than the size that actual performance requires because the problem of technology can not be done very for a short time, that is, the degree of depth in hole and the size of diameter can not be controlled to proper scope.Leakage portion 201 is excessive, then can cause the acoustic resistance of circulation of air to diminish, i.e. damping diminishes, and acoustic resistance is too small, and then the resonance performance of back cavity reduces, and influences the acoustical behavior of loud speaker.And when installation, have other flat boards to cover this leakage portion 201 easily, and easily leakage portion 201 is shut, influence the stability of the acoustical behavior of loud speaker.

Thereby, be necessary to study a kind of Microspeaker with new construction.

The utility model content

The minitype acoustic generator that provides a kind of acoustical behavior stable is provided the technical problems to be solved in the utility model.

For solving the problems of the technologies described above, the technical scheme that the utility model provides is:

A kind of minitype acoustic generator, it mainly comprises pedestal, be embedded in the magnetic bowl in the pedestal, be contained in the magnet steel in the magnetic bowl, part is contained in the coil in the magnetic gap of magnetic bowl and magnet steel formation, be connected in the vibrating diaphragm of coil one end, and form host cavity jointly with pedestal, and said elements held wherein loam cake, described pedestal comprises first surface, second surface and the sidewall that extends to second surface from first surface, be provided with the first leakage portion at described pedestal first surface, this first leakage portion comprises first through hole that runs through pedestal and the groove that does not run through pedestal and extend to described sidewall, and this first through hole is positioned at described inside grooves.

Preferably, described pedestal second surface is provided with the second leakage portion, and this second leakage portion comprises second through hole that runs through pedestal and is connected with second through hole does not pass the slit of pedestal.

Preferred described groove comprises the connecting portion that links to each other with described sidewall and the extension that extends of this connecting portion certainly, and the width of described connecting portion is greater than the width of extension.

The beneficial effects of the utility model are: owing to be provided with the first leakage portion at the pedestal first surface, this first leakage portion comprises first through hole that runs through pedestal and the groove that does not run through pedestal and extend to described sidewall, this first through hole is positioned at described inside grooves, prevented that shutting leakage portion because of client's installation influences acoustical behavior, made that the acoustical behavior of minitype acoustic generator is stable;

In the preferred embodiment that the utility model provides, the utility model includes the first leakage portion of the slit and second through hole by setting, can increase air flow resistance, promotes acoustic resistance, improves acoustical behavior.

Description of drawings

Fig. 1 is the stereogram of the minitype acoustic generator of correlation technique;

Fig. 2 is the enlarged drawing of A ' among Fig. 1;

Fig. 3 is the stereogram that the utility model provides the minitype acoustic generator of an embodiment;

Fig. 4 is the stereogram at another visual angle of minitype acoustic generator of an embodiment providing of the utility model;

Fig. 5 is the enlarged drawing of A part among Fig. 3;

Fig. 6 is the stereogram of the another one embodiment that provides of the utility model;

Fig. 7 is the minitype acoustic generator three-dimensional exploded view of an embodiment providing of the utility model.

Embodiment

The utility model is described in further detail below in conjunction with drawings and embodiments.

Referring to Fig. 3, the utility model minitype acoustic generator 1 is mainly used on the portable consumer electronic products such as mobile phone, in order to the prompting of sounding.

In general, minitype acoustic generator mainly comprises as bowl-shape pedestal, joins with pedestal and be provided with the loam cake in hole, and pedestal and loam cake form a cavity volume.Be provided with in this cavity volume and be contained in the pedestal and link to each other with pole piece, with the vibrating diaphragm of loam cake adjacency, with vibrating diaphragm with permanent magnet that pedestal forms magnetic gap and be suspended in voice coil loudspeaker voice coil in the described magnetic gap, outside pedestal, be provided with the circuit board that realization links to each other with external circuit, the passing the hole that pedestal is provided with into and out of line and link to each other of voice coil loudspeaker voice coil with circuit board.When feeding the alternation tone currents on circuit board, voice coil loudspeaker voice coil is subjected to the motive force of alternation in magnetic gap, produces alternate motion, thereby drives the vibrating diaphragm vibration, sounds.

Please join Fig. 7, be depicted as the three-dimensional exploded view of the utility model Microspeaker 1, this Microspeaker 1 comprises pedestal 11, be embedded in magnetic bowl 12 in the pedestal 11, be contained in magnet steel 13 in the magnetic bowl 12, post the vibrating diaphragm 16 that pole piece 14, part on magnet steel 13 is contained in coil 15 in the magnetic gap that magnetic bowl 12 and magnet steel 13 form, is connected in coil 15 1 ends, and forms host cavities and said elements is held wherein loam cake 17 with pedestal 11 is common.When feeding alternating current in the coil 15, the coil 15 that is in the magnetic gap can be because the effect in magnetic field produces motion, and along with the variation of electric current, this motion also can change thereupon, thereby drives vibrating diaphragm 16 up-down vibration, causes the generation of sound.Pedestal 11 comprises first surface 111, second surface 112 and the sidewall 113 that extends to second surface from first surface.In vibrating diaphragm 16 vibration processes, the air in the back cavity (space at vibrating diaphragm below or rear) can be compressed or expand, and therefore, needs on the pedestal 11 to offer leakage portion so that the circulation of air.Referring to Fig. 4 and Fig. 5, be provided with the first leakage portion 110 at pedestal 11 first surfaces 111, this first leakage portion 110 comprises first through hole 110a that runs through pedestal and the groove 110b that does not run through pedestal 11 and extend to sidewall 113, and this first through hole 110a is positioned at described groove 110b inside.

Referring to Fig. 5, groove 110b comprises the connecting portion 110b1 that links to each other with sidewall 113 and the extension 110b2 that extends of this connecting portion 110b1 certainly, and the width of connecting portion 110b1 is greater than the width of extension 110b2.

Referring to Fig. 6, in another embodiment that the utility model provides, the second leakage portion 120 is arranged on the second surface 112 of pedestal 11, the second leakage portion 120 comprises circular hole and penetrates the second through hole 120a of pedestal 11 and the slit 120b that does not run through pedestal 11 that is connected with this second through hole 120a, during vibrating diaphragm 16 vibrations, the air in the back cavity can be revealed by the second through hole 120a then via this slit 120b.By this way, air can be subjected to the acting in conjunction of the slit 120b and the second through hole 120a, has increased the resistance of air flows, has improved acoustic resistance, has also improved acoustical behavior simultaneously.

In the embodiment that the utility model provides, the first surface 111 of pedestal 11 is the plane that contacts with magnetic bowl 12, the second surface 112 of pedestal 11 is the plane that does not contact with magnetic bowl 12, certainly, the first surface 111 that also can be pedestal 11 is planes that portion contacts with magnetic bowl 12, and the second surface 112 of pedestal 11 is the planes that contact with magnetic bowl 12.

Above-described only is execution mode of the present utility model; should be pointed out that for the person of ordinary skill of the art at this, under the prerequisite that does not break away from the utility model creation design; can also make improvement, but these all belong to protection range of the present utility model.

Claims

1, a kind of minitype acoustic generator, it mainly comprises pedestal, be embedded in the magnetic bowl in the pedestal, be contained in the magnet steel in the magnetic bowl, part is contained in the coil in the magnetic gap of magnetic bowl and magnet steel formation, be connected in the vibrating diaphragm of coil one end, and form host cavity jointly with pedestal, and said elements held wherein loam cake, it is characterized in that: described pedestal comprises first surface, second surface and the sidewall that extends to second surface from first surface, be provided with the first leakage portion at described pedestal first surface, this first leakage portion comprises first through hole that runs through pedestal and the groove that does not run through pedestal and extend to described sidewall, and this first through hole is positioned at described inside grooves.

2, minitype acoustic generator according to claim 1 is characterized in that: described pedestal second surface is provided with the second leakage portion, and this second leakage portion comprises second through hole that runs through pedestal and is connected with second through hole does not pass the slit of pedestal.

3, minitype acoustic generator according to claim 1 is characterized in that: described groove comprises the connecting portion that links to each other with described sidewall and the extension that extends of this connecting portion certainly, and the width of described connecting portion is greater than the width of extension.