KR20140131459A

KR20140131459A - Diaphragm assembly

Info

Publication number: KR20140131459A
Application number: KR20130050133A
Authority: KR
Inventors: 조태관; 김석경
Original assignee: (주) 모토텍
Priority date: 2013-05-03
Filing date: 2013-05-03
Publication date: 2014-11-13

Abstract

The present invention relates to a diaphragm assembly capable of providing an even vibration force on the entire surface of a diaphragm, and in order to achieve the above object, a diaphragm assembly according to the present invention includes: a diaphragm; A bobbin having a constant height and engaging with the bottom of the diaphragm via an upper surface; A voice coil wound on a side surface of the bobbin; A rod which is formed of lightweight styrofoam and has a constant height and engages with a bottom surface of the diaphragm via an upper surface, And a suspension coupled to the rod.

Description

[0001] The present invention relates to a diaphragm assembly,

The present invention relates to a diaphragm assembly, and more particularly, to a diaphragm assembly that includes a rod coupled with a suspension to generate a uniform vibration across the diaphragm without increasing the magnetic field circuit and reduce the weight of the diaphragm assembly, Assembly.

The diaphragm assembly of the speaker device comprises a diaphragm, a bobbin, a voice coil, and a suspension. The diaphragm is provided with resilience through the suspension formed by the surround formed on the diaphragm rim and the bobbin coupling to the bottom of the diaphragm.

It is desirable that the diaphragm has a circular shape with all the edges having the same distance from the center. However, in the case of a speaker device embedded as a component of the IT device, the diaphragm often has a rectangular shape due to the limitation of the mounting space. In particular, since a display device has a mounting space for a speaker device on a bezel that forms a frame of a screen, the speaker device for a display is usually formed in a rectangular shape having a major axis and a minor axis.

In this case, in many cases, the speaker device is provided with a plurality of driving portions so that the diaphragm generates uniform vibration. A speaker device including a conventional suspension is disclosed in Korean Patent Laid-Open Publication No. 10-2010-0011199 "Rectangular thin-film speaker ". Fig. 1 shows a conventional speaker device 1 mounted on a display device. The speaker device 1 shown in Fig. 1 comprises a diaphragm assembly, a plurality of magnetic circuits 10a and 10b, and a case 40. Fig. The diaphragm assembly further includes a diaphragm 21, voice coils 22a and 22b wound on the respective bobbins 23a and 23b of the bobbins 23a and 23b and a suspension 30 separated from the left and right. The suspension 30 of FIG. 1 is formed in the longitudinal direction of the speaker device 1 and is composed of a first suspension division portion and a second suspension division portion which are separated from each other. The suspension partitions are fixedly coupled to both ends of the case 40 in the major axis direction and fixedly coupled to the edge part of the diaphragm 21 through the upper surface. According to this configuration, the suspension 30 provides a restoring force at a plurality of points through the two bobbins 23a and 23b in the case of Fig. 1, thereby providing the effect that the diaphragm 21 can oscillate relatively evenly.

However, the conventional technique shown in Fig. 1 has the following problems.

First, the speaker device 1 of Fig. 1 has a problem of high manufacturing cost due to the complicated structure. A plurality of magnetic field circuits (10a, 10b) raise the component price due to the expensive neodymium magnets. The process of attaching the voice coils 23a and 23b to the diaphragm 21 and the soldering process of applying the external input signal to the voice coils 23a and 23b are required a plurality of times, Also, when a plurality of voice coils 23a and 23b having a high disconnection probability are used, there is a problem that the defective rate and the failure rate increase.

Second, the diaphragm assembly of FIG. 1 has a problem of lowering the speaker efficiency due to an increase in weight. Referring to Equation (1), the speaker efficiency is proportional to the square of the diaphragm assembly weight ( M _ms ).

However, since the diaphragm assembly of FIG. 1 includes a plurality of voice coils 22a and 22b formed of a metal having a high specific gravity, the weight of the diaphragm assembly increases and the speaker efficiency decreases as the weight of the diaphragm assembly increases.

Third, the diaphragm assembly of FIG. 1 uses a diaphragm having a high stiffness to raise the resonance frequency, which lowers the low-frequency characteristics. The diaphragm 21 is required to have a high hardness in order to support the voice coils 22a and 22b with a heavy load and the suspension 30 is attached to the bottom surface of the diaphragm 21 to further increase the hardness of the diaphragm 21 . However, as shown in Equation (2) below, an increase in hardness reduces the ductility ( C _ms , compliance, and inverse of stiffness) and ultimately reduces the resonance frequency. (However, there is a side where the resonance frequency slightly increases in proportion to the square root due to the increase in weight, but this can be neglected as compared with the speaker efficiency dropping to the second power of the weight increase)

Lastly, due to the structure in which the suspension 30 is engaged with both ends of the case 40 in the major axis direction, the suspension 30 is formed to have an excessively long length so that the restoring force provided to the bobbins 23a and 23b is constant in the up- There is a problem that the diaphragm 21 is twisted when vibrating.

Korean Patent Publication No. 10-2011-0051400 Korean Patent Publication No. 10-2012-0053815 Korean Patent Publication No. 10-2012-0108314 Korean Patent Registration No. 10-0963559 Korean Patent Registration No. 10-1052825 Korean Patent Registration No. 10-1061519 Korean Patent Registration No. 10-1061550 Korean Patent Registration No. 10-1074421 Korean Patent Registration No. 10-1134612 U.S. Published Patent Application No. 2012/0106775 U.S. Published Patent Application No. 2012/0128195 U.S. Patent Application Publication No. 2012/0155697

A vibration plate assembly according to the present invention includes a rod on which a voice coil is not wound and a rod and a suspension, which are not a bobbin on which the voice coil is wound, are combined to form a vibration plate assembly The purpose of the suspension is to provide a uniform restoration force across the diaphragm across the rod while minimizing weight gain.

The diaphragm assembly according to an embodiment of the present invention minimizes the number of voice coils in the diaphragm assembly, thereby reducing the number of the magnetic field circuits associated therewith, thereby reducing the production cost of the speaker device, simplifying the assembling process of the speaker device, Thereby minimizing the defect rate and the failure rate.

Another object of the present invention is to improve the reliability of a speaker device by reinforcing the coupling between the rod and the suspension by increasing the coupling area of the suspension by coupling the suspension to the bottom of the rod.

Another object of the present invention is to provide a diaphragm assembly according to another embodiment of the present invention, which is applicable to a micro-speaker in which a self-bonding voice coil is directly attached to a diaphragm by coupling a suspension to a rod separately formed from the voice coil.

Another object of the present invention is to provide a diaphragm assembly according to another embodiment of the present invention in which the suspension is coupled with the case in a direction of a minor axis rather than a major axis direction to uniform the vibration displacement of the suspension to improve the uniformity of vibration of the diaphragm.

Another object of the present invention is to provide a diaphragm assembly according to another embodiment of the present invention, which further includes a spoiler coupled with a bottom surface or a side surface of the rod, thereby easily adjusting the damping force against vibration of the diaphragm by adjusting the area of the spoiler.

Another object of the present invention is to reduce the weight of a vibration system and improve the efficiency of a speaker by forming a rod using lightweight styrofoam.

According to an aspect of the present invention, there is provided a diaphragm assembly comprising: a diaphragm; A bobbin having a constant height and engaging with the bottom of the diaphragm via an upper surface; A voice coil wound on a side surface of the bobbin; A rod which is formed of lightweight styrofoam and has a constant height and engages with a bottom surface of the diaphragm via an upper surface, And a suspension coupled to the rod.

The diaphragm assembly according to an embodiment of the present invention includes L loads and M suspensions (L, M are integers equal to or greater than 1), and L loads are coupled to M suspensions do.

The diaphragm assembly according to the embodiment of the present invention is characterized in that it includes N bobbins (N is an integer of 1 or more).

In the diaphragm assembly according to an embodiment of the present invention, the bobbin is a circular column having open top and bottom surfaces, or a polygonal columnar shape having an open top and bottom openings. The rod has a circular column or a top surface And a polygonal columnar shape in which the bottom face is opened.

In the diaphragm assembly according to the embodiment of the present invention, the bobbin and the rod are formed by rolling the thin film into a circular column or a polygonal columnar shape.

In the diaphragm assembly according to the embodiment of the present invention, the suspension is fixed to the bottom surface of the rod.

The diaphragm assembly according to an embodiment of the present invention further includes a spoiler extending outward from a side surface of the rod.

In the diaphragm assembly according to the embodiment of the present invention, the suspension is fixed to the side surface of the rod.

The diaphragm assembly according to an embodiment of the present invention further includes a spoiler coupled to a bottom surface of the rod and having an area larger than a cross sectional area of the rod.

A diaphragm assembly according to an embodiment of the present invention includes a diaphragm; A voice coil wound to have a constant height and a cross sectional area, and coupled to the bottom of the diaphragm via an upper surface; A rod which is formed of a lightweight styrofoam and has a constant height and engages with a bottom surface of the diaphragm via an upper surface thereof and engages with an area where the voice coil is not engaged; And a suspension coupled to the rod.

In the diaphragm assembly according to the embodiment of the present invention, the suspension is coupled with the bottom surface of the rod.

The diaphragm assembly according to an embodiment of the present invention includes L number of the rods, M number of suspensions, and N number of the voice coils (L, M, N are integers equal to or larger than 1) And the second suspension is coupled with the suspensions.

A vibration plate assembly according to the present invention includes a rod on which a voice coil is not wound and a rod and a suspension, which are not a bobbin on which the voice coil is wound, are combined to form a vibration plate assembly The suspension provides uniform restoration force across the diaphragm across the rod while minimizing weight gain.

The diaphragm assembly according to an embodiment of the present invention minimizes the number of voice coils in the diaphragm assembly, thereby reducing the number of the magnetic field circuits associated therewith, thereby reducing the production cost of the speaker device, simplifying the assembling process of the speaker device, Thereby providing an effect of minimizing the defect rate and the failure rate.

The diaphragm assembly according to another embodiment of the present invention enhances the reliability of the speaker device by enhancing the coupling between the rod and the suspension by increasing the coupling area of the suspension by coupling the suspension to the bottom of the rod.

The diaphragm assembly according to another embodiment of the present invention can be applied to a miniature miniature speaker (micro speaker) in which a self-bonding voice coil is directly attached to a diaphragm by coupling a suspension to a rod separately formed from the voice coil do.

The diaphragm assembly according to another embodiment of the present invention provides an effect of improving the uniformity of vibration of the diaphragm by making the suspension uniformly oscillate displacement by engaging with the case in the direction of the minor axis rather than the longitudinal axis.

The diaphragm assembly according to another embodiment of the present invention further includes a spoiler that engages with a bottom surface or a side surface of the rod, thereby providing an effect of easily adjusting the damping force against the vibration of the diaphragm by adjusting the area of the spoiler.

The diaphragm assembly according to another embodiment of the present invention reduces the weight of the vibration system and improves the efficiency of the speaker by forming a rod using lightweight styrofoam.

1 is an exploded perspective view of a speaker device including a diaphragm assembly according to the prior art;
2 is an exploded perspective view of a speaker device including a diaphragm assembly according to an embodiment of the present invention;
3 is a bottom view of a diaphragm assembly according to an embodiment of the present invention.
4 is a longitudinal sectional view of a speaker device including a diaphragm assembly according to an embodiment of the present invention.
5 is a plan view showing a suspension of a diaphragm assembly according to an embodiment of the present invention;
6 is a plan view showing a suspension of a diaphragm assembly according to another embodiment of the present invention;
7 is a bottom view of a diaphragm assembly according to another embodiment of the present invention;
8 is a bottom view of a diaphragm assembly according to another embodiment of the present invention;
Figure 9 is a combined view showing the combination of a rod, suspension, spoiler in accordance with an embodiment of the present invention;
10 is a combined view illustrating the combination of a rod, suspension, spoiler in accordance with another embodiment of the present invention;
11 is a bottom view showing a diaphragm assembly according to a second embodiment of the present invention.

&Lt; Embodiment 1 >

3 is a bottom view of the diaphragm assembly 120 according to the first embodiment of the present invention, and FIG. 4 is a perspective view of the diaphragm assembly 120 according to the first embodiment of the present invention. FIG. 2 is an exploded perspective view of the speaker device 100 including the diaphragm assembly 120 according to the present invention. 1 is a longitudinal sectional view of a speaker device 100 including a diaphragm assembly 120 according to the present invention. The diaphragm assembly 120 according to the present invention includes a diaphragm 121, a bobbin 123, a voice coil 122, rods 124a and 124b, and suspensions 130a and 130b.

The diaphragm 121 has a constant area, and the diaphragm may have a polygonal shape, a circular shape, an elliptical shape, a track shape, or an irregular shape including a quadrangle, and may be an audio speaker, The speakers may be rectangular. The diaphragm 121 may be configured to include a diaphragm body that provides a vibration surface, an edge that forms an interface of the diaphragm, a gasket that is in close contact with the frame or the case 140 of the speaker device 100 The structure is not limited to this structure, and other known diaphragm structures can be applied. The diaphragm 121 may be made of a paper, a polymer film, a fabric, a thin film resin, a metal plate, a PCB substrate, or other known diaphragm material.

The cross-sectional shape of the diaphragm 121 may be planar as shown in Fig. 3, or may be formed such that a convex portion or a concave portion is formed on a part of the vibration surface as shown in Fig. 2, It may be configured to have a three-dimensional shape such as a dome shape. When the height of the speaker device 100 is desired to be low, it is preferable that the speaker device 100 is formed in a planar shape or a planar shape in which some convex portions or concave portions are formed as shown in Figs.

The bobbin 123 has a constant height and engages with the bottom surface of the diaphragm through the upper surface. The voice coil 122 is wound on the side surface of the bobbin 123. The planar shape of the bobbin 123 may have a circular shape, an elliptical shape, a track shape, a polygonal shape including a quadrangle, or an irregular shape depending on the shape of the magnetic circuit 100 to which the voice coil 122 is coupled. The bobbin 123 may be formed by rolling a paper or polymer film so as to form a closed curved surface.

Preferably, the bobbin 123 may be formed as a circular column having open top and bottom faces or a polygonal column shape having open top and bottom faces in order to minimize the weight increase of the diaphragm assembly 120.

The bobbin 123 may be formed at the center as shown in FIGS. 2 and 3, or may be formed so that a plurality of bobbins 123 are attached to a single diaphragm assembly 120, similar to the structure of FIG. have.

The rods 124a and 124b are formed of lightweight styrofoam and have a constant height and are configured to be coupled to the bottom surface of the diaphragm 121 through the top surface but to the area where the bobbin 123 is not coupled. The rods 124a and 124b of the present invention may be formed by molding a lightweight styrofoam to minimize the weight increase of the vibration system as a component for transmitting the restoring force to the diaphragm 121 in combination with the suspensions 130a and 130b .

The rods 124a and 124b are preferably formed so as to have a circular column or a polygonal column shape filled with a lightweight styrofoam, unlike the bobbin 123 in which the inside is empty, May be formed in a circular shape, an elliptical shape, a track shape, a polygonal shape including a rectangle, or an irregular shape.

The rods 124a and 124b are configured such that the cross section forms a closed surface so as to maintain its own transverse sectional shape and uniformly provide the restoring force provided by the suspensions 130a and 130b described later on the diaphragm.

The suspensions 130a and 130b are connected to the frame or case 140 of the speaker device 100 at one side and the rods 124a and 124b are combined with the other side to provide a restoring force to the diaphragm through the rods 124a and 124b . As shown in FIG. 3, the suspension 130a and 130b may be formed of metal and may be configured to provide a restoring force similar to that of the leaf spring. Alternatively, as shown in FIG. 2, Or a damper made of a fabric material. However, the present invention is not limited thereto, and the suspension 130a, 130b or a damper material known in the field of speakers can be used. When the suspensions 130a and 130b are formed of metal leaf springs, the suspensions 130a and 130b coupled with the single rods 124a and 124b may have a single shape as shown in FIG. 5, As shown in Fig.

On the other hand, the number of the rods 124a, 124b and the bobbin 123 to be coupled with the diaphragm 121 may be one or more. For example, if the diaphragm assembly 120 uses two rods 124a and 124b as shown in Figures 1 and 2, it can couple with two suspensions 130a and 130b, respectively. The diaphragm assembly 120 also includes N loads 124a and 124b and N suspensions 130a and 130b that are two or more integers as shown in Figures 7 and 8 and N loads 124a and 124b, 124b may be coupled to N suspensions 130a, 130b, respectively.

It should be noted that the suspensions 130a and 130b coupled with the rods 124a and 124b do not necessarily have to be of the same number and may be configured to couple a plurality of rods 124a and 124b with a single suspension 130a and 130b And conversely, a plurality of suspensions 130a, 130b can be combined with a single rod 124a, 124b. The diaphragm assembly 120 then includes N rods 124a and 124b and M suspensions 130a and 130b where N is an integer greater than or equal to 2 and M is an integer greater than or equal to 1 and less than N, (124a, 124b) are preferably configured to mate with the M suspensions (130a, 130b). According to this embodiment, in the speaker device 100 using the diaphragm having a large area, the effect that the driving force provided by the suspensions 130a and 130b can be uniformly provided throughout the diaphragm through the plurality of rods 124a and 124b .

Meanwhile, it is preferable that the suspension 130 is fixed to the bottom surface of the rod 124 as shown in FIG. According to this structure, the bottom surface of the rod 124 is stably supported on the upper surface of the suspension 130, and the bonding area is increased, thereby improving the durability and assemblability of the speaker device 100.

Preferably, the diaphragm assembly 120 further includes a spoiler 125 extending outwardly from the side of the rod 124 to increase air resistance. According to this embodiment, in addition to the restoring force of the suspension 130, there is an effect of providing a damping force by the spoiler to the diaphragm.

According to another embodiment, the suspension 130 may be fixed to the side of the rod 124 as shown in Fig. Preferably, the diaphragm assembly 120 further includes a spoiler 125 that engages the bottom surface of the rod 124 and has an area larger than the cross-sectional area of the rod 124 to increase air resistance. According to this embodiment, in addition to the restoring force of the suspension 130, there is an effect of providing a damping force by the spoiler to the diaphragm.

&Lt; Embodiment 2 >

Hereinafter, a second embodiment of the present invention will be described with reference to Fig. The second embodiment is characterized in that the voice coil 122 is attached to the bottom surface of the diaphragm 121 by self-bonding without interposing the bobbin 123, as compared with the first embodiment. This configuration is mainly used in miniature speakers installed in small IT devices such as smart phones and mobile phones.

The diaphragm assembly 120 according to the second embodiment includes diaphragm 121, voice coil 122, rods 124a and 124b, and suspensions 130a and 130b. The other components except for the voice coil 122 are the same as those of the first embodiment, so duplicate descriptions are omitted.

The voice coil 122 of the second embodiment is wound to have a constant height and a cross sectional area, and is coupled with the bottom surface of the diaphragm 121 through the upper surface. The transverse section of the voice coil 122 may be polygonal, circular, tower, track type including a quadrangle, and the voice coil 122 is configured to maintain the coiled shape including the junction layer. Therefore, according to the second embodiment, it is possible to provide a relatively uniform braking force to the entire diaphragm through the rods 124a and 124b even in a miniature speaker, thereby improving the sound quality and simplifying the structure of the speaker device 100 .

In the second embodiment, as in the first embodiment, the suspensions 130a and 130b are connected to the bottoms of the rods 124a and 124b as shown in FIG. 9, or the rods 124a and 124b And may include a spoiler 125 that engages a side or bottom of the rods 124a, 124b to provide additional damping force to the braking forces of the suspensions 130a, 130b.

100: speaker device 110: magnetic field circuit
120: diaphragm assembly 121: diaphragm
122: Voice coil 123: Bobbin
124: load 130: suspension
140: Case

Claims

tympanum;
A bobbin having a constant height and engaging with the bottom of the diaphragm via an upper surface;
A voice coil wound on a side surface of the bobbin;
A rod which is formed of lightweight styrofoam and has a constant height and engages with a bottom surface of the diaphragm via an upper surface, And
And a suspension coupled to the rod.

The method according to claim 1,
The diaphragm assembly includes L loads and M suspensions (L, M are integers equal to or greater than 1)
L < / RTI > of said rods engage M of said suspensions.

3. The method of claim 2,
Wherein the diaphragm assembly comprises N number of bobbins (where N is an integer greater than or equal to one).

The method according to claim 1,
The bobbin is a circular column having open top and bottom faces, or a polygonal column shape having open top and bottom faces,
Wherein the rod is a circular column with open top and bottom surfaces or a polygonal columnar shape with open top and bottom sides.

The method of claim 4,
Wherein the bobbin and the rod are formed by rolling the thin film into a circular column or a polygonal columnar shape.

The method according to claim 1,
Wherein the suspension is fixed to a bottom surface of the rod.

The method according to claim 6,
Wherein the diaphragm assembly further comprises a spoiler extending outwardly from a side of the rod.

The method according to claim 1,
Wherein the suspension is fixed to a side of the rod.

9. The method of claim 8,
Wherein the diaphragm assembly further comprises a spoiler coupled to a bottom surface of the rod and having an area greater than a cross sectional area of the rod.

tympanum;
A voice coil wound to have a constant height and a cross sectional area, and coupled to the bottom of the diaphragm via an upper surface;
A rod which is formed of a lightweight styrofoam and has a constant height and engages with a bottom surface of the diaphragm via an upper surface thereof and engages with an area where the voice coil is not engaged; And
And a suspension coupled to the rod.

11. The method of claim 10,
Wherein the suspension engages a bottom surface of the rod.

11. The method of claim 10,
Wherein the diaphragm assembly further comprises a spoiler extending outwardly from a side of the rod.

11. The method of claim 10,
Wherein said diaphragm assembly comprises L of said rods, M said suspensions, and N said voice coils (L, M, N being integers of one or more)
L < / RTI > of said rods engage M of said suspensions.