CN101931844B

CN101931844B - Microspeaker

Info

Publication number: CN101931844B
Application number: CN2010101058834A
Authority: CN
Inventors: 都成焕
Original assignee: DONGGUAN BAOXING ELECTRONICS Co Ltd; RONGCHENG BAOXING ELECTRONIC CO Ltd; BSE Co Ltd
Current assignee: Dongguan Baoxing Electronics Co. Ltd; Rongcheng Baoxing Electronic Co. Ltd; BSE Co Ltd
Priority date: 2009-06-22
Filing date: 2010-01-20
Publication date: 2013-08-07
Anticipated expiration: 2030-01-20
Also published as: WO2010150953A1; CN101931844A; KR200454507Y1; TWM382684U; CN201608885U; KR20100012959U; TW201101855A

Abstract

The present invention relates to a microspeaker. The microspeaker of the present invention comprises: a frame; a yoke which is fixed to the frame and has a reception groove; a permanent magnet fixed to a bottom of the reception groove of the yoke; a plate fixed to an upper surface of the permanent magnet; a diaphragm having an outer circumference fixed to the frame; and a voice coil fixed to a lower surface of the diaphragm. The microspeaker is characterized in that a chamfered surface is formed on at least one of the lateral sides of the plate and a lateral side of the yoke facing the lateral side of the plate. According to the present invention, a horizontal magnetic field region is expanded within a magnetic gap between the yoke and the plate.

Description

Microspeaker

Technical field

The present invention is about Microspeaker, and more particularly, about a kind of Microspeaker, wherein the marginal texture of yoke and the dull and stereotyped horizontal magnetic field line zone that is modified to expand within the magnetic gap improve the actuating force that acts on the sound coil by this.

Background technology

In general, loudspeaker are the equipment that the conversion electric signal becomes voice signal.Loudspeaker mainly are categorized into medium-and-large-sized loudspeaker, it is connected to message or amplifier, and with voice emplifying significantly, and compact horn is used for the portable type audio unit, it is increased demand at present, and this device similarly is mobile phone, mobile computer, MP3 player and earphone etc.These compact horn summarys are called Microspeaker.The present invention is about this Microspeaker.

The configuration that typical Microspeaker has general structure is done simple declaration with reference to Fig. 1.Fig. 1 is the schematic section perspective view of a typical Microspeaker 100.

Typical case's Microspeaker 100 comprises framework 101, yoke 102, permanent magnet 103, flat board 104, sound coil 105 and barrier film 106.Though be not shown among Fig. 1, enclosing cover is coupled in the upper portion of framework 101.

Framework 101 is the members that defined the outward appearance of this Microspeaker.The steam vent (not shown) is defined on the side of framework 101.Barrier film 106 is distinguished into inside portion 107 and outside portion 109 with respect to boundary portion 108.Twine lead in the middle of the upper end of this sound coil, it is attached to the lower surface of the boundary portion 108 of barrier film 106.A part that is not wrapped in this lead in the sound coil 105 is exposed to the outside of framework 101, uses being connected to external power source.

A part of extending downwards from sound coil 105 is arranged in the magnetic gap, and it is to be formed on the internal side wall of flat board 104 and the space between the yoke 102.When the current signal with several frequencies is applied in sound coil 105, according to the amplitude of the density of electric current and this frequency and with the magnetic field interaction to produce mechanical energy.Therefore, sound coil 105 is namely vertically mobile.Therefore, the barrier film 106 that is attached to sound coil 105 is vertically moved, and also produces vibration.That is to say that barrier film 106 is vertically mobile, can be by the acoustic pressure that the people was heard of normal hearing to produce.

The schematic diagram that Fig. 2 flows for magnetic field line.Shown in Figure 2 only is the profile of the part of yoke 102, flat board 104 and sound coil 105.In having the typical Microspeaker of this generality structure, the magnetic field line M that is produced by permanent magnet 103 appears at a space via dull and stereotyped 104, and then enters yoke 102 and turn back to permanent magnet 103 to form magnetic circuits.

But flat board 104 arranges from the teeth outwards with yoke 102 with facing with each other.Therefore, these surfaces of yoke 102 are with respect to dull and stereotyped 104 not symmetries and vertically setting.Therefore, the top at the edge of the configuration of magnetic field line M from dull and stereotyped 104 enters the top at edge of yoke 102 and the situation of lateral surface is not expected with the lateral surface appearance.That is to say that the magnetic field line M by sound coil 105 can have a zonule, wherein magnetic field line M is maintained in level.Simultaneously, this magnetic field can reduce in the upper portion of this magnetic circuits and the symmetry between the following quadrate part.

In addition, act on a plurality of directions owing to flow to the Lorentz force (lorentzforce) that the reaction in magnetic field line M and the sound coil 105 produces by electric current, sound coil 105 produces distortion for vibrate non-perpendicularly.Simultaneously under certain situation, it is limited in sound coil 105 can be with dull and stereotyped 104 or yoke 102 collisions and cause their damage.

Summary of the invention

Therefore, the present invention is about a kind of Microspeaker, and it can alleviate in fact because the restriction of correlation technique and one or more problems that shortcoming causes.

The present invention's one purpose is to provide a kind of Microspeaker, and wherein the horizontal zone of the magnetic line of force is expanded and improves the actuating force of sound coil in the magnetic gap between yoke and flat board.

Additional advantage of the present invention, purpose and feature propose part in the following description, and other parts can be understood more after inspecting following content for the present technique professional person or can be by learning in the middle of the enforcement of the present invention.These purposes of the present invention and other advantage can be by the explanation that discloses and claims thereof, and in the accompanying drawing the specific structure that indicates understand and acquisition.

In order to reach these purposes and other advantage, and according to purpose of the present invention, so the place is concrete implements and the generalized description person, and a kind of Microspeaker is provided, and it comprises: framework; Yoke, it is fixed in this framework, and this yoke has receiving slit; Permanent magnet, it is fixed in the lower surface of the receiving slit of this yoke; Flat board, it is fixed in the upper surface of this permanent magnet; Barrier film, its outer periphery is fixed in this framework; And sound coil, it is fixed in the lower surface of this barrier film, and wherein chamfer surface is arranged in the lateral surface of this flat board and this yoke at least one upper end.

This chamfer surface can comprise the yoke chamfer surface, it is arranged on the upper portion of this yoke, and this yoke chamfer surface can be on the upper surface that is connected this yoke in the vertical cross section that takes out along the virtual surface at the center dull and stereotyped by this one predetermined first on this lateral surface of this yoke a straight line of predetermined second do setting, wherein this first be arranged on be defined corresponding to the horizontal smallest point of about 1/4 position of the thickness of this yoke and be defined corresponding to by virtual yoke contact point (i.e. the line stretcher of the lateral surface of this yoke and upper surface contact with each other place) between the horizontal maximum point of about 3/4 position of this thickness on the outward direction, and second be arranged on be defined corresponding to the vertical smallest point of about 1/4 position of the thickness of this yoke and be defined corresponding to by this virtual yoke contact point between the vertical maximum point of about 3/4 position of the thickness of this yoke on the downward direction.

This chamfer surface can comprise dull and stereotyped chamfer surface, it is arranged on this dull and stereotyped upper portion, and should the flat board chamfer surface in the vertical cross section that takes out along the virtual surface at the center dull and stereotyped by this can along be connected on this dull and stereotyped upper surface one predetermined thirdly on this lateral surface of this flat board a straight line of predetermined the 4th do setting, wherein this thirdly is arranged on and is defined corresponding in the horizontal smallest point of about 1/4 position of this dull and stereotyped thickness and be defined corresponding to by virtual board joint contact (lateral surface that namely should flat board and the line stretcher of upper surface contact with each other place) in the inward direction between the horizontal maximum point of about 3/4 position of this thickness, and the 4th be arranged on be defined corresponding to the vertical smallest point of about 1/4 position of this dull and stereotyped thickness and be defined corresponding to by this virtual board joint contact between the vertical maximum point of about 3/4 position of thickness that should flat board on the downward direction.

This chamfer surface can be included in the dull and stereotyped chamfer surface and yoke chamfer surface on this yoke on this flat board.

The chamfered surface of the yoke through the plate in the center along a virtual surface of a vertical sectional view taken along the yoke connected to the upper surface of a predetermined first point to that of the lateral surface of the yoke for a predetermined second point of the line to make settings; wherein the first set point is defined in the yoke corresponds to the thickness of about 1/ 4 of the horizontal position of the minimum point and is defined by the corresponding virtual contact with the yoke point ( that is, the lateral surface of the yoke extension line of the upper surface of the contact points with each other ) in the outward direction of the thickness is about 3 /4 of the maximum level at a position between the points ; the second set is defined corresponds to the thickness of the magnetic yoke of about 1 /4 of the vertical position of the minimum point and is defined by the corresponding yoke of the virtual contact point in the downward direction of the thickness of the yoke about 3/4 at a position vertical maximum points; chamfered surface of the plate , and along the center of the plate through a virtual surface in a vertical sectional view taken along the plate connected to the upper surface of a predetermined point to the third plate the lateral surface of the fourth point on a straight line at a predetermined set up to do ; wherein the third point is defined in the corresponding setting of the plate thickness of about 1/4 of the level at the position corresponding to the minimum point and is defined by the virtual flat contact point ( that is, the lateral surface of the upper plate surface in contact with each other at the extension line ) on the inward direction of the thickness of about 3 /4 of the maximum level at a position between the point and the fourth point is set in the defined corresponds to the thickness of the plate about 1/ 4 of the vertical position of the minimum point and is defined by the corresponding contact point of the virtual plate of the plate in the downward direction of the thickness of about 3/4 of the maximum vertical position between points .

This flat board chamfer surface and this yoke chamfer surface can arrange with respect to doing symmetrically across the virtual vertical line of the central point of these two lateral surface respect to one another.

This first this virtual yoke contact point of can serving as reasons is defined at a point corresponding to 1/2 position of this yoke thickness at this outward direction, and this second this virtual yoke contact point of can serving as reasons is defined at a point corresponding to 1/2 position of this yoke thickness in this downward direction.

Can recognize aforementioned is exemplary and illustrative for general remark of the present invention and following detailed description, and the further explanation as the invention of advocating will be provided.

Description of drawings

Accompanying drawing comprises to provide for the present invention further to be understood, and is used for adding and constituting the part of the application's case, and accompanying drawing is the illustration specific embodiments of the invention, cooperates its explanation to can be used for explaining principle of the present invention.In the middle of accompanying drawing:

Fig. 1 is the schematic section perspective view of a typical Microspeaker;

Fig. 2 is the schematic diagram that flows of the magnetic line of force of Fig. 1;

Fig. 3 is the schematic section perspective view of the Microspeaker of one specific embodiment according to the present invention;

Fig. 4 and Figure 5 shows that the profile of in the Microspeaker of Fig. 3 yoke and dull and stereotyped major part;

Fig. 6 is the constructed profile of the Microspeaker of another specific embodiment according to the present invention; And

Fig. 7 is the constructed profile of the Microspeaker of another specific embodiment according to the present invention.

Embodiment

To carry out detailed reference to preferred embodiment of the present invention now, its example all is illustrated in the middle of the accompanying drawing.

Describe a kind of Microspeaker of one specific embodiment according to the present invention in detail to Fig. 5 hereinafter with reference to Fig. 3.

Figure 3 shows that the schematic section perspective view of the Microspeaker 1 of one specific embodiment according to the present invention, and Fig. 4 and Figure 5 shows that the profile of in the Microspeaker 1 of Fig. 3 yoke 20 and dull and stereotyped 40 major part.

The Microspeaker 1 of this specific embodiment comprises framework 10; This yoke 20, it is fixed in framework 10 and has receiving slit; Permanent magnet 30, it is fixed in the lower surface of the receiving slit of yoke 20; This flat board 40, it is fixed in the upper surface of permanent magnet 30; Barrier film 50, its outer periphery is fixed in framework 10, and sound coil 60, and the lower surface of barrier film 50 is fixed in its upper end.

The invention is characterized in the configuration of yoke 20 and dull and stereotyped 40, and remaining component has identical configuration with typical Microspeaker.Therefore, their detailed description will be omitted.Below will only describe characteristic configuration of the present invention in detail.

The Microspeaker 1 of this specific embodiment of root tool, yoke chamfer surface 24 and a dull and stereotyped chamfer surface 44 are separately positioned on the upper end of the lateral surface 22 of yoke 20, and the upper end of dull and stereotyped 40 lateral surface 42.Herein, the lateral surface 22 of yoke 20 is towards the lateral surface 42 of flat board 40.

Yoke chamfer surface 24 describes in detail with reference to Fig. 4 and Fig. 5 with dull and stereotyped chamfer surface 44.Figure 4 shows that the vertical cross section of virtual surface at the center of the flat board 40 by Microspeaker 1.Figure 5 shows that yoke 20 that Fig. 4 is only arranged and dull and stereotyped 40 thin portion fragmentary cross-sectional view.

Yoke 20 comprises bottom member and sidewall, and its periphery along this bottom member extends upward.Yoke chamfer surface 24 is arranged on the upper portion of the inside lateral surface 22 of this sidewall.Yoke chamfer surface 24 is arranged on the part at upper surface 23 places of lateral surface 22 contact yokes 20.

Please refer to Fig. 5, the straight line of yoke chamfer surface 24 predetermined first A1 predetermined second A2 on the lateral surface 22 of yoke 20 on the upper surface 23 that connects yoke 20 is done setting.First A1 be arranged on be defined at corresponding to the horizontal smallest point Y2 of the position at about 1/4 place of the thickness Yt of yoke 20 and be defined at corresponding to by virtual yoke contact point Y1 (be the line stretcher of the lateral surface 22 of yoke 20 and upper surface 23 contact with each other place) between the horizontal maximum point Y3 of about 3/4 the position of this thickness Yt on the outward direction.Second A2 be arranged on be defined corresponding to the vertical smallest point Y4 of about 1/4 the position of the thickness Yt of yoke 20 be defined at corresponding to by this virtual yoke contact point Y1 between the vertical maximum point Y5 of about 3/4 the position of the thickness Yt of downward direction upper magnet yoke 20.That is to say, yoke chamfer surface 24 along the sidewall of yoke 20 with do three-dimensionally to the straight line of this second A2 and arrange along being connected this first A1, it is limited in the profile.

Dull and stereotyped chamfer surface 44 is arranged on the upper portion of the lateral surface 42 of flat board 40.Dull and stereotyped chamfer surface 44 is arranged on the position of the plane upper surface 44 of lateral surface 42 contacts dull and stereotyped 40.

Dull and stereotyped chamfer surface 44 is done setting along the straight line that connects on this dull and stereotyped upper surface 43 a predetermined thirdly A3 predetermined the 4th A4 on dull and stereotyped 40 the lateral surface 42.Thirdly A3 be arranged on be defined at corresponding to the horizontal smallest point P2 of the position at about 1/4 place of dull and stereotyped 40 thickness Pt be defined at corresponding to by virtual yoke contact point P1 (i.e. the line stretcher of the lateral surface 42 of flat board 40 and upper surface 43 contact with each other place) in the inward direction between the horizontal maximum point P3 of about 3/4 the position of this thickness Pt.The 4th A4 be arranged on be defined at corresponding to the vertical smallest point P4 of about 1/4 the position of dull and stereotyped 40 thickness Pt with define corresponding to by this virtual yoke contact point P1 between the vertical maximum point P5 of about 3/4 the position of the thickness Pt of downward direction upper flat plate 40.

That is to say, the periphery of dull and stereotyped chamfer surface 44 along dull and stereotyped 40 with along be connected this thirdly A3 do to the straight line of the 4th A4 and arrange three-dimensionally, it is limited in the profile.

For this specific embodiment, dull and stereotyped chamfer surface 44 and yoke chamfer surface 24 are done symmetrically with respect to the virtual line C across the central point of two lateral surface 42 that face with each other and 22 and are arranged.That is to say that

chamfer surface

44 and 24 has identical angle and area.

Simultaneously in this specific embodiment, first A1 of yoke chamfer surface 24 is a point that is defined in corresponding to by virtual yoke contact point Y1 position of 1/2 of this yoke thickness Yt on this outward direction, and second A2 is a point that is defined in corresponding to by this virtual yoke contact point Y1 position of 1/2 of this yoke thickness Yt on this downward direction.Simultaneously, the thirdly A3 of dull and stereotyped chamfer surface 44 is a point that is defined in corresponding to by this virtual yoke contact point P1 position of 1/2 of this slab-thickness Pt on this inward direction, and dull and stereotyped the 4th A4 to angle surface 44 is a point that is defined in corresponding to by this virtual yoke contact point P1 position of 1/2 of this slab-thickness Pt on this downward direction.Therefore, when yoke 20 had the thickness identical with dull and stereotyped 40, the shape of yoke chamfer surface 24 was symmetrical in the shape of dull and stereotyped chamfer surface 44.

According to the Microspeaker 1 with said structure, because the chamfer surface that faces with each other 24 and 44 is separately positioned on these upper portion of yoke 20 and dull and stereotyped 40, the horizontal zone of this magnetic line of force can expand in the magnetic gap.

That is to say, for this typical case's Microspeaker, because yoke roughly is perpendicular to one another with dull and stereotyped upper end, the horizontal zone that constitutes the magnetic line of force of magnetic circuits can't be fixed within the magnetic gap maturely, and can reduce the symmetry in magnetic field between dull and stereotyped 40 upper portion and the following quadrate part.Therefore, its actuating force that is limited in this sound coil of running namely can reduce, and non-perpendicular movement takes place.

But according to the present invention, because

chamfer surface

24 and 44 is separately positioned on the yoke 20 and dull and stereotyped 40, aforesaid typical limitations can solve.Simultaneously, can be expanded at the horizontal zone of this magnetic line of force in this magnetic gap, and the symmetry in this magnetic field can be enhanced between dull and stereotyped 40 upper portion and the following quadrate part.

Therefore, the actuating force of this sound coil is enhanced, and the non-perpendicular vibration of this sound coil is lowered and improves the distortion of this barrier film.Simultaneously, the scraping phenomenon between the yoke of this sound coil and this dull and stereotyped inwall can be lowered.Herein, the possible twisting vibration that cause owing to the rolling mode of this sound coil of this scraping phenomenon takes place.

For the Microspeaker 1 of aforementioned specific embodiment, the identical distance because first A1 and second A2 and this virtual yoke contact point Y1 are separated by, yoke chamfer surface 24 is with respect to central vertical line C about 45 ° angle that tilts, and the present invention is not limited to this.That is to say, according to another specific embodiment, when first A1 and second A2 are arranged on a plurality of different positions in aforesaid limited field, yoke chamfer surface 24 is inclined to a plurality of different angles with respect to this central vertical line C, except about 45 ° angle.Simultaneously, yoke chamfer surface 24 can have multiple different area.

But, when first A1 be defined in from this contact point Y1 less than this yoke thickness 1/4 or greater than its position of 3/4, this second A2 be defined in from this contact point Y1 less than this yoke thickness 1/4 or greater than its position of 3/4, be the condition that first and second A1 and A2 can't reach to be needed, the area of this chamfer surface is too small or excessive.Therefore, can't realize the configuration of wanting of this magnetic line of force.Therefore, first and second A1 and A2 must satisfy above-mentioned condition.

Be similar to yoke chamfer surface 24, in another specific embodiment, dull and stereotyped chamfer surface 44 can have multiple different angle and area when the 3rd and the 4th A3 and A4 when being changed within required condition preposition.

Though yoke chamfer surface 24 has flat surfaces with dull and stereotyped chamfer surface 44 in this specific embodiment, the present invention is not limited to this.For example, yoke chamfer surface 24 can have level and smooth convex curved surface with dull and stereotyped chamfer surface 44.That is to say, the line that connects first and second A1 and A2 be connected the 3rd and the line of the 4th A3 and A4 except straight line, can have the convex circular shape.

Though yoke chamfer surface 24 is symmetrically setting with respect to this central vertical line C with dull and stereotyped chamfer surface 44 in this specific embodiment, the present invention is not limited to this.That is to say that in another specific embodiment yoke chamfer surface 24 also asymmetricly arranges with respect to this central vertical line C with dull and stereotyped chamfer surface 44.

Simultaneously, though these chamfer surfaces are arranged on the both sides of this yoke and flat board in this specific embodiment, the present invention is not limited to this.For example, this chamfer surface can be arranged on the either side of this yoke and these dull and stereotyped both sides.

Figure 6 and Figure 7 is for only being arranged on yoke or only being arranged on dull and stereotyped state according to a specific embodiment chamfer surface of revising.

That is to say, Figure 6 shows that chamfer surface 24a only is arranged on the state on the yoke 20.Because the chamfer surface 24a of this specific embodiment has identical structure and configuration with aforementioned specific embodiment, the explanation that they repeat will be omitted.

Figure 7 shows that chamfer surface 44a only is arranged on the state on dull and stereotyped 40.Because the chamfer surface 44a of this specific embodiment has identical structure and configuration with aforementioned specific embodiment, so will omit the explanation that they repeat.

According to Microspeaker of the present invention, the horizontal zone of this magnetic line of force can be expanded to improve the actuating force of this sound coil within this magnetic gap.In addition, the symmetry in this magnetic field can be enhanced between dull and stereotyped 40 upper portion and the following quadrate part, improving the distortion of this barrier film, and can reduce the non-perpendicular vibration of this sound coil and this barrier film.

Present technique professional person can recognize in the present invention can carry out multiple correction and variation.Therefore, the present invention is contained for this correction and the variation of invention within appended claim and their coordinate category.

The primary clustering symbol description

1 Microspeaker

10 frameworks

20 yokes

22 lateral surface

23 upper surfaces

24 yoke chamfer surfaces

The 24a chamfer surface

30 permanent magnets

40 flat boards

42 lateral surface

43 upper surfaces

44 dull and stereotyped chamfer surfaces

The 44a chamfer surface

50 barrier films

60 sound coils

100 Microspeakers

101 frameworks

102 yokes

103 permanent magnets

104 flat boards

105 sound coils

106 barrier films

107 inside portions

108 boundary portion

109 outside portions

Claims

1. a Microspeaker is characterized in that, comprises: framework; Yoke, it is fixed in this framework, and this yoke has receiving slit; Permanent magnet, it is fixed in the lower surface of the receiving slit of this yoke; Flat board, it is fixed in the upper surface of this permanent magnet; Barrier film, its outer periphery is fixed in this framework; And sound coil, it is fixed in the lower surface of this barrier film, and wherein chamfer surface is arranged in the lateral surface of this flat board and this yoke at least one upper end;

This chamfer surface comprises the yoke chamfer surface on the upper portion that is arranged on this yoke, this yoke chamfer surface is being done setting along first predetermined straight line of being scheduled to this lateral surface of this yoke of second of the upper surface that connects this yoke on the vertical cross section that takes out by the virtual surface at this flat board center, wherein this first be arranged on be defined at corresponding to the horizontal smallest point of 1/4 position of the thickness of this yoke and be defined within corresponding to by virtual yoke contact point between the horizontal maximum point of 3/4 position of this thickness on the outward direction, described contact point i.e. the line stretcher of the lateral surface of this yoke and the upper surface place that contacts with each other, and second be arranged on be defined at corresponding to the vertical smallest point of 1/4 position of the thickness of this yoke and be defined at corresponding to by this virtual yoke contact point between the vertical maximum point of 3/4 position of the thickness of this yoke on the downward direction;

This chamfer surface comprises the dull and stereotyped chamfer surface that is arranged on this dull and stereotyped upper portion, this flat board chamfer surface is being done setting along connecting predetermined the 4th the straight line of thirdly being scheduled to this lateral surface of this flat board of this dull and stereotyped upper surface on the vertical cross section that takes out by the virtual surface at this flat board center, wherein this thirdly is arranged on and is defined at corresponding in a horizontal smallest point of 1/4 position of this dull and stereotyped thickness and be defined at corresponding to by virtual board joint contact in the inward direction between the horizontal maximum point of 3/4 position of this thickness, the lateral surface that described contact point namely should flat board and the line stretcher of the upper surface place that contacts with each other, and the 4th be arranged on be defined at corresponding to the vertical smallest point of 1/4 position of this dull and stereotyped thickness and be defined within corresponding to by this virtual board joint contact between the vertical maximum point of 3/4 position of thickness that should flat board on the downward direction;

This flat board chamfer surface and this yoke chamfer surface can be with respect to doing to arrange symmetrically across the virtual vertical line of the central point of these two lateral surface that face with each other.

2. Microspeaker as claimed in claim 1, it is characterized in that, this first this virtual yoke contact point of serving as reasons is defined at a point corresponding to 1/2 position of this yoke thickness at this outward direction, and this second this virtual yoke contact point of serving as reasons is defined at a point of 1/2 position of this yoke thickness in this downward direction.