KR101503869B1 - Magnetic circuit for speaker and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a magnetic circuit for a speaker and a method of manufacturing a magnetic circuit for a speaker, and more particularly, to a method for manufacturing a magnetic circuit for a speaker and a speaker, A plate having a second injection hole formed therein, a magnetic body having magnetism and a molten melt in a molten state are mixed with each other to form an injection space between the yoke and the yoke, A reaction space part for placing a coil provided on the diaphragm of the speaker is formed between the main magnet and the inner side surface of the recessed central part of the yoke when the main magnet is injected, And is fixed inside the frame to vibrate the diaphragm as the coil vibrates.
According to the present invention, since the yoke and the plate are integrally formed when the main magnet is formed, the joining process and the working time can be shortened, the quality uniformity and the characteristics are excellent, the working efficiency can be improved, The required space can be reduced and the cost can be reduced.

Description

Technical Field [0001] The present invention relates to a magnetic circuit for a speaker,

More particularly, the present invention relates to a magnetic circuit for a speaker, and more particularly, to a speaker for use in a speaker, in which a part of each of the components, which are separately manufactured and joined together, is integrally formed, A magnetic circuit for a speaker and a method for manufacturing a magnetic circuit for a speaker which can stabilize the mutual joining force.

In general, the sound heard by the ear is a wave created by the vibration of an object, a special form of kinetic energy that arises when an atom moves in a regular pattern.

Various acoustical instruments used in real life use kinetic energy of electrons moving when electric current flows in electric wire, kinetic energy of electrons is a kind of electric energy, and this electric energy makes a sound from a speaker.

We hear the loudspeakers from our speakers because our eardrum vibrates as the air molecules move.

As one example of such a speaker, as disclosed in Japanese Patent No. 10- 1140239, a vibrator is installed inside a frame and a frame cover, and the vibrator reacts with an electric field generated from the voice coil and outputs sound as it vibrates .

Fig. 1 schematically shows a conventional speaker, and Fig. 2 shows an assembled state of a conventional speaker.

As shown in the figure, the speaker is provided with a yoke 5, a magnet 6 and a plate 7 sequentially in the frame 2, and then the diaphragm 4 provided with the coil 3 is mounted on the frame 2).

In other words, the magnet 6, the plate 7, and the yoke 5 are manufactured and sequentially bonded to each other, and a plurality of operators are sequentially bonded and manufactured.

In this way, when a plurality of workers join each constitution step by step, the fatigue due to the simple labor of the worker accumulates, so that the work efficiency is lowered with the elapse of time and the failure can be caused.

The magnet 6 and the plate 7 and the yoke 5, which are used for the speaker 6 and the yoke 5, There is a problem that the incidence rate of defects is high even if assembled by a machine.

Particularly, as the concentricity of the magnet 6 and the plate 7 becomes equal to or larger than the tolerance, an eccentric magnetic field is formed to cause defects such as defects such as detachment due to poor bonding force and the like.

This defect can not be prevented because the defective product is not able to be sold due to the unconditionally defect in the subsequent process even if any one of the bonding processes is erroneous. Particularly, the sensitive magnet 6, the plate 7 and the yoke 5 There is a need for the development of a technique capable of reducing the defect rate and improving the working efficiency.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a magnetic bearing in which a plate having a first injection hole formed therein and a second injection hole formed therein is integrally formed when the main magnet is injected, A magnetic circuit for a speaker and a method for manufacturing a magnetic circuit for a speaker that can improve not only cost but also mutual bonding strength.

According to an aspect of the present invention, there is provided a motor including a yoke having a central portion protruding downwardly and formed with a first injection hole on a bottom surface thereof, an injection space formed between the yoke and the yoke, A plate having a second injection hole formed therein, and a main magnet which is formed integrally with the yoke and the plate as the injection space is filled with the magnetic magnetic material and the molten plastic, A reaction space part for placing a coil provided on the diaphragm of the speaker is formed between the inner surface of the recessed central part of the yoke and the reaction space part fixed to the inside of the frame constituting the outer shape of the speaker, Vibrate the diaphragm.

Preferably, the yoke has an engaging protrusion protruded along an outer circumferential surface of the upper end to improve the engaging force when the frame is manufactured.

The main magnet is injected through at least one selected from the first injection hole and the second injection hole.

In addition, the first injection hole of the yoke is inclined outwardly toward the lower side to gradually increase the sectional area, and the main magnet which is injected into the first injection hole and the injection space portion and solidified is integrally formed with the first injection hole And the bonding force is improved.

In addition, the second injection hole of the plate is inclined outwardly toward the upper side to gradually increase the cross-sectional area, and the solidified main magnet is injected into the second injection hole and the injection space to be integrally joined to the second injection hole So that the bonding force is improved.

The magnetic material of the main magnet is at least one selected from the group consisting of Sm, Fe, barium ferrite, strontium ferrite, cobalt niobate, and neodymium (ND).

Further, a sub-magnet is further provided on the upper side of the plate.

Further, the sub-magnet is formed by sintering neodymium (Nd).

The lower end polarity of the sub-magnet is the same as the upper end polarity of the tangential main magnet, so that mutual repulsive force acts.

In addition, the plate has a seating space at the center so that the sub-magnet is seated.

The second sub magnet is further provided to surround the outside of the reaction space part.

In addition, the second sub-magnet is provided in place of the yoke edge portion forming the reaction space portion.

A second plate is further provided along the upper end of the second sub-magnet.

Further, the second sub-magnet is located along the outer peripheral surface of the yoke.

A step of mounting a plate on a mounting groove of a lower mold having a lower injection hole formed therein so that a mounting block is formed so as to form a mounting groove on a central portion thereof, mounting a yoke on a mounting block of the lower mold, Covering the lower mold with the yoke mounted thereon; injecting molten plastic mixed with a magnetic material through at least one of the lower injection hole and the upper injection hole to mold the main magnet integrally with the plate and the yoke; And separating the main magnet formed integrally with the plate and the yoke from the upper mold and the lower mold.

The method may further include bonding the sub-magnet to a plate integrally coupled to the main magnet.

As described above, according to the magnetic circuit for a speaker and the method for manufacturing a magnetic circuit for a speaker according to the present invention, when the yoke and the plate are integrally formed at the time of forming the main magnet, mutual bonding process and working time can be shortened, It is a very useful and effective invention which can improve the working efficiency due to excellent performance characteristics and reduce the required space as the work process is reduced, thereby reducing the cost.

1 is a view showing a conventional speaker,
2 is a view showing an assembly state of a conventional speaker,
3 is a view showing a magnetic circuit for a speaker according to the present invention,
4 is a view showing a disassembled state of a magnetic circuit for a speaker according to the present invention,
5 is a view showing an assembled state of a magnetic circuit for a speaker according to the present invention,
FIG. 6 is a view showing a separated state of a magnetic circuit for a speaker according to the present invention,
7 is a view showing a method of manufacturing a magnetic circuit for a speaker according to the present invention,
8 is a view showing a state in which a second auxiliary magnet is further provided in the magnetic circuit for a speaker according to the present invention,
9 is a view showing another embodiment of the second sub magnet according to the present invention,
10 is a view showing a manufacturing process of a magnetic circuit for a speaker according to the present invention,
11 is a diagram showing a magnetic circuit for an assembled speaker according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

It should be noted that the present invention is not limited to the scope of the present invention but is only illustrative and various modifications are possible within the scope of the present invention.

FIG. 3 is a view showing a magnetic circuit for a speaker according to the present invention, FIG. 4 is a view showing a disassembled state of a magnetic circuit for a speaker according to the present invention, 7 is a view showing a method of manufacturing a magnetic circuit for a speaker according to the present invention, and Fig. 8 is a view showing a state in which the magnetic circuit for a speaker according to the present invention is separated. Fig. FIG. 9 is a view showing another embodiment of the second auxiliary magnet according to the present invention, and FIG. 10 is a view showing another embodiment of the present invention FIG. 11 is a view showing a magnetic circuit for a speaker assembled according to the present invention.

As shown in the figure, a speaker magnetic circuit 10 is composed of a yoke 100, a plate 200, and a main magnet 300.

First, the yoke 100 is recessed to protrude downward in a central portion thereof, and has a mounting space portion 110, and a first injection hole 120 is formed in a depressed bottom surface.

The yoke 100 may be formed of a metal or a non-metal material. In an exemplary embodiment, the yoke 100 may be formed of a semi- .

The plate 200 is spaced apart from the yoke 100 by a predetermined distance and a second injection hole 210 is formed and an injection space 110 is formed between the yoke 100 and the plate 200 .

The injection space portion 110 is formed not only by the yoke 100 and the plate 200 but also by the injection space portion 110 in which the four sides are closed as the yoke 100 and the plate 200 are mounted on the mold .

The main magnet 300 is formed by filling the injection space 110 with the magnetic material 310 having the magnetic property and the melted material 320 in the molten state while the injection space 110 is formed, Molded together with the yoke (100) and the plate (200).

In other words, the magnetic substance 310 of a predetermined size is mixed with the molten melt 320 and then injected through the first injection hole 120 of the yoke 100 or the second injection hole 210 of the plate 200 And is injection-molded integrally with the yoke 100 and the plate 200.

Here, the melt 320 uses plastic or rubber, and a molten material that can be solidified after cooling can be used.

A coil 30 provided on the diaphragm 40 of the speaker is disposed between the outer surface of the ejected main magnet 300 and the inner surface of the depressed central portion of the yoke 100 when the main magnet 300 is ejected And is fixed inside the frame 20 constituting the outer shape of the speaker to vibrate the diaphragm 40 as the coil 30 is vibrated.

The molten material 320 in a molten state in which the magnetic material 310 is mixed may be injected through at least one of the first injection hole 120 and the second injection hole 210. In one embodiment, And the gas in the injection space part 110 is discharged through the second injection hole 210 and the main magnet 300 is injected.

Of course, the gas may be injected through the second injection hole 210, the gas may be discharged through the first injection hole 120, and may be simultaneously injected and discharged through the first injection hole 120 and the second injection hole 210 Gas discharge may also occur.

Here, the first injection hole 120 of the yoke 100 is formed to be inclined outward toward the lower side, and the sectional area gradually increases from the upper side to the lower side.

The first injection hole 120 is formed in the molten state to inject the first injection hole 120 through the first injection hole 120 and the lower end of the solidified main magnet 300 The first injection hole 120 is formed so as to correspond to the inclined inner surface and is injected in the engaged state to further improve the bonding force and accuracy.

In other words, the main magnet 300 can be precisely formed in the center of the yoke 100.

The second injection hole 210 of the plate 200 is formed to be inclined outward toward the upper side, and the sectional area gradually increases from the lower side to the upper side.

The second injection hole 210 is for injecting molten material through the second injection hole 210 and then the upper end of the solidified main magnet 300 Is formed to correspond to the inclined inner surface of the second injection hole 210, and is injected in the engaged state, the bonding force and accuracy are further improved.

The central point of the yoke 100, the main magnet 300, and the plate 200 is formed in the center of the main magnet 300 precisely formed at the center of the yoke 100, Or within a tolerance range.

Here, the magnetic substance 310 of the main magnet 300 is at least one selected from the group consisting of Fe, Fe, barium ferrite, strontium ferrite, neodymium (ND) To the molten melt 320.

At this time, the magnetic material 310 of the main magnet 300 may be made of a magnetic material having its own magnetism, or may be magnetized as necessary through a device capable of imparting magnetism.

A sub magnet 400 is further provided on the upper side of the plate 200. The sub magnet 400 is coupled to the upper side of the plate 200 integrally projected on the upper side of the main magnet 300, (Not shown).

The plate 200 is formed with a seating space 220 at the center so that the sub magnet 400 can be seated thereon. The sub magnet 400 is forced into the seating space 220, And may be bonded to each other after the application of the adhesive member.

The sub-magnet 400 is formed by sintering neodymium (Nd), and may be formed of other materials having magnetism.

At this time, the lower end polarity of the sub-magnet 400 is the same as the upper end polarity of the contacting main magnet 300, so that mutual repulsive force acts.

5, when the lower end of the main magnet 300 is an N pole and the upper end is an S pole, the lower end of the sub-magnet 400 is an S pole and the upper end is an N pole A repulsive force is generated.

An unstable magnetic field is formed between the main magnet 300 and the sub magnet 400 by the repulsive force, and a current is applied to the coil, which vibrates in response to the unstable magnetic field.

The magnetic circuit 10 in which the yoke 100, the plate 200, and the main magnet 300 are integrally formed is used as installed in a speaker as shown in FIGS. 5 to 6, As shown in FIG. 6, since the integrated magnetic circuit 10 is easily installed inside the frame 20, it is possible to omit the processes that have been conventionally installed to improve the production time and work efficiency, It can be done.

As shown in FIGS. 7 to 8, the second sub magnet 500 is further provided to surround the outside of the reaction space part 130.

As shown in FIG. 7, the second sub-magnet 500 is provided in place of the edge portion of the yoke 100 forming the reaction space portion 130.

In other words, a second sub-magnet 500 is provided in place of a part of the yoke 100 to vibrate the coil 30 together with the main magnet 300.

Of course, the sub-magnet 400 is provided, and the magnetic field is formed together with the sub-magnet 400, so that the coil 30 can be vibrated.

The poles of the upper and lower ends of the second sub-magnet 500 are formed differently from the poles of the main magnet 300.

In one embodiment, when the lower end of the main magnet 300 is N-pole and the upper end is S-pole, the upper end of the second sub-magnet 500 is N-pole and the lower end is S-pole.

Here, the second plate 510 may be further provided along the upper end of the second sub-magnet 500.

On the other hand, the second sub magnet 500 'of another embodiment is positioned along the outer peripheral surface of the yoke 100 as shown in FIG.

In other words, the second sub-magnet 500 'is provided in place of a part of the housing 20, and a mounting groove is formed in the housing 20 located outside the yoke 100, And is fixed to the yoke 100.

The second sub-magnet 500 'vibrates the coil 30 together with the main magnet 300.

Of course, the sub-magnet 400 is provided, and the magnetic field is formed together with the sub-magnet 400, so that the coil 30 can be vibrated.

Here, the poles of the upper and lower ends of the second sub magnet 500 'are different from the poles of the main magnet 300.

In one embodiment, when the lower end of the main magnet 300 is an N pole and the upper end is an S pole, the upper end of the second sub magnet 500 'is formed as an N pole and the lower end is formed as an S pole.

As shown in FIGS. 9 to 10, the method of manufacturing the magnetic circuit 10 for a speaker according to an embodiment includes a plate mounting step S10, a yoke mounting step S20, an upper mold covering step S30, A main magnet forming step S40 and a separating step S50.

In the plate mounting step S10, the plate 200 is mounted on the lower mold 70. First, the lower mold 70 is protruded from the mounting block 72 so that the mounting groove 74 is formed at the center, A lower injection hole 76 is formed.

Of course, the lower mold 70 may be formed with a gas discharge hole (not shown) depending on the case. The lower discharge hole 76 may be formed only by a gas discharge hole (not shown) 76 and a gas discharge hole may be formed.

It is preferable that a gas discharge hole (not shown) is formed in the upper mold 80 by injecting the molten main magnet 300 when only the lower injection hole 76 is formed in the lower mold 70. [

When only a gas discharge hole (not shown) is formed in the lower mold 70, an upper injection hole 86 is formed in the upper mold 80 so that the molten main magnet 300 is injected.

When the lower injection hole 76 and the gas discharge hole are formed in the lower mold 70, the upper injection hole 86 and the gas discharge hole are formed in the upper metal mold 80 so that the molten main magnet 300 is short- As shown in FIG.

The plate 200 is placed in the mounting groove 72 of the lower mold 70 in the plate mounting step S10.

The yoke 100 is mounted on the stationary block 74 of the lower mold 70 so that the yoke 100 is spaced apart from the plate 200 by a predetermined distance, A mounting space portion 110 in which the mounting portion 300 can be installed is formed.

The upper mold covering step S30 is a step of covering the lower mold 70 in which the yoke 100 is mounted with the upper mold 80 having the upper injection hole 86 formed therebetween and the lower mold 70 is interposed between the lower mold 70 and the upper mold 80 So that the main magnet 300 is prepared for injection.

In the main magnet forming step S40, the melted melted material 320 mixed with the magnetic material 310 is injected through at least one of the lower ejection hole 76 and the upper ejection hole 86 to form the main magnet 300 And is formed integrally with the plate 200 and the yoke 100.

In other words, when the molten melt 320 mixed with the magnetic material 310 is injected through the lower injection hole 76, the molten melt 320 is injected through the second injection hole 220 formed in the plate 200 to be injected into the main magnet 300 ) Is injected.

Conversely, when the melted melted material 320 mixed with the magnetic material 310 is injected through the upper injection hole 86, the molten melt 320 injected through the first injection hole 120 formed in the yoke 100 is injected into the main magnet 300, Lt; / RTI >

When the melted melted material 320 mixed with the magnetic material 310 is simultaneously injected through the lower injection hole 76 and the upper injection hole 86, the first injection hole 120 formed in the yoke 100, The main magnet 300 is simultaneously injected through the second injection hole 220 formed in the main body 200.

Of course, it is a matter of course that the gas existing inside the closed upper mold 80 and the lower mold 70 is discharged through the gas discharge holes formed in the upper mold 80 and the lower mold 70.

In the separation step S50, the main magnet 300 formed integrally with the plate 200 and the yoke 100 is separated from the upper mold 80 and the lower mold 70.

Here, as shown in FIG. 11, the speaker-use magnetic circuit 10 is arranged so that a plurality of the speaker circuits 10 are in a straight line, and assembled into one.

A plurality of such assembled magnetic circuits 10 for speakers are used one by one as needed.

A plurality of yokes 100 are formed on a metal plate formed in a lengthwise direction and a plurality of yokes 100 and a corresponding plate 200 are arranged on the metal plate. The main magnet 300 can be assembled in one piece by molding the main magnet 300 after the molds 70 and 80 are mounted.

It goes without saying that the present invention can be used irrespective of the method of assembling the magnetic circuit 10 for a plurality of speakers.

Here, the sub-magnet 400 may be further provided in the magnetic circuit 10, and a sub-magnet coupling step S60 for installing the sub-magnet 400 is further constructed.

In this sub-magnet coupling step S60, the sub magnet 400 is coupled to the plate 200 integrally coupled to the main magnet 300, and it is preferable that the sub magnet coupling is performed using an adhesive member (not shown).

Thus, in order to manufacture the magnetic circuit for a conventional speaker, the sub-magnets 400 are separately joined in a state where the yoke 100, the plate 200, and the main magnet 300 are integrally formed. The operation time can be shortened and the working efficiency can be improved.

10: Oscillator 20: Frame
30: coil 40: diaphragm
70: lower mold 80: upper mold
100: yoke 110: installation space part
120: first injection hole 130: injection space part
140: engaging projection 200: plate
210: second injection hole 300: main magnet
310: Magnetic body 320: Melt
400: Sub magnet

Claims (16)

A yoke having a center portion projecting downwardly and formed with a first injection hole on a bottom surface thereof;
A plate having a second injection hole formed therein and spaced apart from the yoke by a predetermined distance to form an injection space between the yoke and the yoke;
And a main magnet which is mixed with the yoke and the plate as being filled in the injection space part by mixing the magnetic substance having magnetism with the melt in the molten state,
A reaction space is formed between the outer surface of the injected main magnet and the inner surface of the recessed central portion of the yoke when the main magnet is injected,
And the vibration plate is fixed inside the frame forming the outer shape of the speaker to vibrate the vibration plate by vibrating the coil.
2. The yoke according to claim 1,
And a coupling protrusion is formed to protrude along an upper outer circumferential surface to improve a coupling force when the frame is manufactured.
The magnetron according to claim 1,
Wherein the first and second injection holes are formed on the first and second injection holes.
[2] The apparatus of claim 1, wherein the first injection hole of the yoke comprises:
The cross-sectional area gradually increases toward the lower side,
Wherein the first injection hole and the main magnet injected into the injection space and solidified are integrally joined to the first injection hole to improve the coupling force.
2. The apparatus of claim 1, wherein the second injection hole of the plate comprises:
The cross-sectional area is gradually increased toward the upper side,
And the main magnet which is injected into the second injection hole and the injection space and solidified is integrally joined to the second injection hole to improve the coupling force.
The magnetic sensor according to claim 1, wherein the magnetic body of the main magnet comprises:
Wherein at least one selected from the group consisting of silicon nitride (Sm) and iron (Fe), barium ferrite, strontium ferrite, lead cobalt and neodymium (ND).
The method according to claim 1,
And a sub-magnet is further provided on the upper side of the plate.
The sub-magnet according to claim 7, wherein the sub-
Wherein the first electrode is formed by sintering neodymium (Nd).
The method as claimed in claim 7, wherein the lower end polarity of the sub-
And a mutual repulsive force is applied to the main magnetic pole.
8. The apparatus of claim 7,
And a seating space is formed at a central portion of the sub-magnet for seating the sub-magnet.
The method according to claim 1,
And a second sub-magnet is further provided to surround the outside of the reaction space.
12. The sub-magnet according to claim 11, wherein the second sub-
Wherein the magnetic circuit is provided in place of the yoke edge portion forming the reaction space portion.
13. The method of claim 12,
And a second plate is further provided along an upper end of the second sub-magnet.
12. The sub-magnet according to claim 11, wherein the second sub-
And is located along an outer circumferential surface of the yoke.
Placing a plate on a mounting groove of a lower mold in which a mounting block is protruded to form a mounting groove in a central portion and a lower injection hole is formed;
Mounting a yoke on a mounting block of the lower mold;
Covering an upper mold having an upper injection hole formed therein with a lower mold having the yoke mounted thereon;
Injecting molten melt mixed with a magnetic material through at least one of the lower injection hole and the upper injection hole to form a main magnet integrally with the plate and the yoke;
And separating the main magnet integrated with the plate and the yoke from the upper mold and the lower mold.
16. The method of claim 15,
And bonding the sub-magnet to a plate integrally coupled to the main magnet.

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