KR101068783B1 - Sound converter and manufacturing method for it - Google Patents

Abstract

The sound transmitting apparatus according to the present invention includes a frame, a yoke, an inner / outer ring magnet, an inner / outer ring top plate, a coil part, and a diaphragm, but since the interference prevention part is provided on the outer ring top plate, the lead wire drawn out from the coil part is a diaphragm. Even when bonded to the outer ring, the interference with the outer ring top plate can be prevented, and since the positioning part is provided in the outer ring top plate, the positioning part is seated at the fixed position of the frame core mold when inserting the frame into the outer ring top plate. Interference protection can also be placed in the correct position, facilitating production and manufacture.

Sound conversion device, frame, yoke, magnet, top plate, coil part, leader

Description

SOUND CONVERTER AND MANUFACTURING METHOD THEREOF {SOUND CONVERTER AND MANUFACTURING METHOD FOR IT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an acoustic transducer and a method for manufacturing the same, and more particularly, to an acoustic transducer and a method for manufacturing the same, which improves sound quality defects due to collisions with other parts in which a bonded fixed part of a leader line is adjacent. It is about.

In general, the acoustic transducer is installed around a magnet in which a magnetic field is generated, and an electric signal is applied to the coil to move the coil by pushing or pulling the magnetic field and the magnetic field generated in the magnet, and a vibration plate attached to the coil. This vibration is a device that generates sound with the principle of generating sound pressure.

The magnetic circuit of the acoustic transducer is designed so that the magnetic flux can be bridged at right angles to the voice coil existing in the void by using a magnet (permanent magnet) and a top plate (or upper plate) in the yoke made of ferrous metal, respectively. The voice coil is bonded to the diaphragm to generate the up and down excitation force by the input signal to vibrate the diaphragm bound to the frame to generate sound pressure. The diaphragm has various shapes of waves in order to remove the buckling phenomenon and excellent response during the up and down oscillation, and the shape of the diaphragm serves as a design variable that has the greatest influence on the frequency characteristics.

1 is a cross-sectional view of an acoustic transducer according to the prior art.

Conventional acoustic transducers transmit magnetic flux to or from the frame 1, the yoke 2 inserted into the frame 1, and the yoke 2 as shown in FIG. The inner ring top plate 5 receiving the magnetic flux from the inner ring magnet 3 and the outer ring magnet 4 and the inner ring magnet 3 or the outer ring magnet 4 receiving the magnetic flux at right angles to the coil unit 5. ) And the outer ring top plate 6, the coil portion 7 in which a portion is inserted into a gap between the inner ring magnet 3 and the inner ring top plate 5, and the outer ring magnet 4 and the outer ring top plate 6; It is attached to the upper portion of the portion 7 includes a diaphragm 8 for generating a vibration in accordance with the vertical movement of the coil portion (7).

The lead wire 12 of the coil portion 7 is fixed to the bottom surface of the diaphragm 8 using a pretreatment bond, and penetrates the side surface of the frame 1 or forms a groove (not shown) formed in the frame 1. It is drawn out through and soldered to terminals (not shown) along the outer side of the frame 1, respectively.

Recently, the acoustic transducer has been developed to be thin so that it can be applied to a narrow space. However, if the conventional acoustic transducer is thin in thickness, the lead wire 9 drawn out from the coil portion 7 is fixed to the bottom surface of the diaphragm 8 with a pretreatment bond, so that the diaphragm 8 is pulled out as the vibration plate 8 vibrates. The line 9 frequently hits the outer ring top plate 6 located at the bottom thereof, thereby causing a sound quality defect or disconnection defect.

The present invention has been made to solve the above problems of the prior art, and an object of the present invention is to provide an acoustic converter and a method of manufacturing the same, which can improve the sound quality defect or disconnection defect caused by contact between components.

Another object of the present invention is to provide an acoustic converter and a method of manufacturing the same, which are easy to produce and manufacture.

According to an aspect of the present invention, there is provided a sound conversion apparatus including a frame having a plurality of air holes; A yoke inserted inside the frame; An inner ring magnet and an outer ring magnet laminated on the yoke and having magnetic flux acting thereon; An inner ring top plate and an outer ring top plate laminated on the inner ring magnet and the outer ring magnet and receiving magnetic flux from the inner ring magnet or the outer ring magnet; A coil part having a portion inserted between the inner ring magnet and the outer ring magnet; A diaphragm attached to an upper end of the coil part and generating vibrations according to vertical movement of the coil part; A lead wire drawn out from the coil part and drawn out in the circumferential direction in a state of being bonded and bonded to the bottom of the diaphragm; And, even if the vibration plate is vibrated, in order to prevent a collision with the bonding adhesive portion of the leader line; an interference prevention portion formed on the outer ring top plate;

In addition, in the present invention, the interference prevention portion is characterized in that the inner ring portion of the outer ring top plate is removed.

In addition, in the present invention, the interference preventing portion is characterized in that the forged so that the inner ring portion of the outer ring top plate is thinner than the other portion.

In addition, in the present invention, the interference prevention portion is characterized in that the circumferential portion of the outer ring top plate is removed.

In addition, in the present invention, the sound transducer further comprises a positioning unit provided in the outer ring top plate in order to position the interference prevention unit in a predetermined position.

In addition, in the present invention, the positioning portion is characterized in that the projection form protruding on the outer circumferential surface of the outer ring top plate.

On the other hand, the manufacturing method of the acoustic transducer according to the present invention comprises a first step of seating on the frame core mold so that the interference prevention portion of the outer ring top plate is located at a predetermined position; A second step of stacking the outer ring magnet and the yoke on the outer ring top plate seated on the frame core mold in the first step; And a third step of insert-injecting the frame to accommodate the outer ring top plate, the outer ring magnet, and the yoke laminated to the frame core mold in the second step.

In the present invention, in the first step, the positioning portion provided on the outer circumferential surface of the outer ring top plate is seated between the protrusions provided in the frame core mold.

Further, in the present invention, the protrusions of the frame core mold in the first step is characterized in that the protrusions for forming air holes in the frame.

The acoustic transducer and the method for manufacturing the same according to the present invention constituted as described above, even if the lead line of the coil unit is fixed to the bottom surface of the diaphragm, the diaphragm vibrates because the outer ring top plate adjacent to the outer ring top plate is provided with an interference prevention unit removed or forged. Even though the space between the bonding line of the leader line and the outer ring top plate can be secured, the thickness can be made thin, and the sound quality defect caused by the collision with the bonding line of the leader line and the outer ring top plate can be improved. .

In addition, the acoustic conversion device and the manufacturing method according to the present invention is provided with a positioning portion protruding to the outer ring of the outer ring top plate in addition to the interference prevention portion provided on the outer ring top plate, when inserting the frame into the outer ring top plate When the positioning portion is seated between the protrusions of the frame core mold provided to form the air hole, the interference preventing portion and the positioning portion are placed on the outer ring top plate because the interference preventing portion is located at a precise portion close to the lead line drawn from the coil portion. It can be formed integrally, and further easily assembled with other parts, there is an advantage of easy production and manufacturing.

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

2 to 3 is a cross-sectional view and a plan view showing an example of the sound conversion device according to the present invention, Figure 4 is an exploded perspective view showing the frame insert assembly structure of the sound conversion device according to the present invention.

An example of an acoustic transducer according to the present invention is a frame 51, yoke 52, inner ring magnet 53 and outer ring magnet 54, inner ring top plate 55 and outer ring as shown in Figs. Including a top plate 56, a coil portion 57, a diaphragm 58, in order to prevent interference with the lead line 59 drawn from the coil portion 57, the outer ring top plate 56, a portion of the interference prevention portion 56a is provided, and the positioning part 56b is provided in the outer peripheral part of the outer ring top plate 56 so that the interference prevention part 56a can be assembled in the correct position.

The leader line 59 is drawn out from the coil part 57 and bonded to the bottom of the diaphragm 58, and then drawn out in the circumferential direction and fixed to the side of the frame 51. At this time, since it is fixed to the bottom surface of the diaphragm 58 in a state that the bond is covered on the leader line 59, it is located closer to the outer ring top plate 56.

The interference prevention part 56a is formed at a portion of the inner circumferential surface of the outer ring top plate 56, and the outer ring top to secure a predetermined distance b between the bonding fixing part of the lead wire 59 and the outer ring top plate 56. A portion of the plate 56 may be variously formed to be erased or forged, and more detailed embodiments will be described below. At this time, since the conventional outer ring top plate is formed with a uniform thickness, the distance between the bonding fixing portion of the leader line and the outer ring top plate (a: shown in Figure 1) is relatively narrow, whereas the outer ring top plate 56 of the present invention is Since the interference prevention part 56a is provided, the distance b between the bonding fixing part of the leader line 59 and the outer ring top plate 56 can be formed relatively wide, whereby the sound transmission device having a thin thickness as a whole is formed. Can be implemented.

The positioning portion 56b is formed to protrude on the outer circumferential surface of the outer ring top plate 56, and the positioning portion 56b is used to insert and eject the frame 51 as shown in FIG. It is to be seated between the projections (61a, 61b) provided in (60). The frame core mold 60 is provided with two protrusions 61a and 61b at both sides thereof, respectively, in order to form two air holes 51a at both sides of the frame 51, and at one side of the frame 51. Grooves 62 are provided between 61a and 61b. Therefore, in the insert injection process, the outer ring top plate 56, the outer ring magnet 54, and the yoke 52 are sequentially stacked on the upper surface of the frame core mold 60, and the outer ring top plate 56 has a positioning unit. As the 56b is seated in the groove portion 62 of the frame core mold 60, the interference prevention portion 56a is positioned at a predetermined position, and then the frame 51 is manufactured by insert injection molding.

5A to 5C are perspective views illustrating various embodiments of the outer ring top plate of the acoustic transducer according to the present invention.

As shown in FIG. 5A, the first embodiment of the outer ring top plate 56 includes an interference prevention part 56a from which a portion of an inner circumferential surface is removed, and a positioning unit protruding in a plate-like protrusion on a portion of the outer circumferential surface. 56b).

As shown in FIG. 5B, the second embodiment of the outer ring top plate 66 includes an interference prevention part 66a forging a portion of the inner circumferential surface to have a smaller thickness than the other portion, and a first embodiment on the portion of the outer circumferential surface. Similarly to the example, the positioning unit 66b is provided.

As shown in FIG. 5C, the third embodiment of the outer ring top plate 76 includes an interference prevention part 76a from which some intervals in the circumferential direction are removed. 76b).

Accordingly, as shown in FIGS. 5A to 5C, when the frame 51 is insert-injected in a state in which the yoke 52, the outer ring magnet 54, and the outer ring top plates 56, 66, and 76 are stacked, the frame 51 The ring-shaped lower fixing portion (not shown) of () is installed to engage the outer peripheral portion of the bottom surface of the yoke 52, and the flat ring-shaped upper fixing portion 51b of the frame 51 is the outer ring top plate (56, 66, 76) It is installed to engage with the outer peripheral part of the upper surface. At this time, since the outer circumferential ends of the yoke 52 and the outer ring magnet 54 are formed in a circular shape, the yoke 52 and the outer ring magnet 54 may rotate inside the frame 51, but the outer ring top plate 56 66 and 76 are outer ring top plates 56, 66 and 76 because the positioning portions 56b, 66b and 76b of the shape protruding at the outer circumferential ends thereof are engaged between the air holes 51a of the frame 51. ) Can be prevented from rotating inside the frame 51, so that the interference preventing portions 56a, 66a, 76a of the outer ring top plates 56, 66, 76 are pulled out at a predetermined position of the frame 51, that is, withdrawal. It is positioned below the bonding fixture of the line 59 (shown in FIG. 2) to maintain a constant spacing b (shown in FIG. 2).

6 is a graph showing the electromagnetic force according to the vibration position of the diaphragm in the conventional sound conversion apparatus of the present invention.

In the acoustic transducer of the present invention, the electromagnetic force is shown to be reduced by only about 2% of the electromagnetic force in the conventional acoustic transducer, regardless of the vibration position of the diaphragm, as shown in FIG. Pressure Level) is also reduced by about 0.2dB. At this time, the vibration position of the diaphragm of the X axis represents the displacement of the diaphragm by the coil part, the initial position of the diaphragm is 0, the position where the diaphragm is moved up / down is represented by +/-, and the electromagnetic force of the Y axis is The magnitude of the excitation force acting on the voice coil determines the magnitude of the sound pressure generated by the acoustic transducer.

While the entire section of the outer ring top plate is conventionally formed in a uniform shape, in the present invention, since some sections of the outer ring top plate are formed by eliminating or forging an interference prevention part, the electromagnetic force of the present invention is reduced than the conventional electromagnetic force. However, in other words, the electromagnetic force in the acoustic transducer of the present invention is insignificantly reduced by the electromagnetic force in the conventional acoustic transducer, and generally does not affect the sound pressure quality when considering a measurement error of the sound pressure as 1 dB. It can be seen as. That is, it can be seen that the acoustic conversion device of the present invention is not significantly inferior to the acoustic characteristics even when the leader line is configured to prevent interference with the outer ring top plate.

In the above, the present invention has been described in detail by way of examples based on the embodiments of the present invention and the accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the contents described in the claims below.

1 is a cross-sectional view showing an example of the acoustic transducer according to the prior art.

2 is a cross-sectional view showing an example of an acoustic transducer according to the present invention.

3 is a plan view illustrating one example of an acoustic transducer according to the present invention;

Figure 4 is an exploded perspective view showing the frame insert assembly structure of the acoustic transducer according to the present invention.

5a to 5c are perspective views showing various embodiments of the top plate of the acoustic transducer according to the present invention.

Figure 6 is a graph showing the electromagnetic force according to the vibration position of the diaphragm in the conventional and the acoustic transducer of the present invention.

Claims (9)

A frame having a plurality of air holes; A yoke inserted inside the frame; An inner ring magnet and an outer ring magnet laminated on the yoke and having magnetic flux acting thereon; An inner ring top plate and an outer ring top plate laminated on the inner ring magnet and the outer ring magnet and receiving magnetic flux from the inner ring magnet or the outer ring magnet; A coil part having a portion inserted between the inner ring magnet and the outer ring magnet; A diaphragm attached to an upper end of the coil part and generating vibrations according to vertical movement of the coil part; A lead wire drawn out from the coil part and drawn out in the circumferential direction in a state of being bonded and bonded to the bottom of the diaphragm; An interference prevention part formed on the outer ring top plate to prevent a collision between the bonding adhesive part of the leader line and the outer ring top plate even when the diaphragm vibrates; And, The sound converting apparatus includes a positioning unit provided in the outer ring top plate in order to position the interference preventing unit at a predetermined position. The method of claim 1, The anti-interference unit, characterized in that the inner ring portion of the outer ring top plate is removed. The method of claim 1, The interference prevention unit is a sound conversion device, characterized in that forging a portion of the inner ring of the outer ring top plate thinner than the other portion. The method of claim 1, The interference prevention unit is a sound conversion device, characterized in that the circumferential portion of the outer ring top plate is removed. delete The method of claim 1, The positioning unit is a sound conversion device, characterized in that the protrusion form protruding on the outer circumferential surface of the outer ring top plate. A first step in which the positioning portion provided on the outer circumferential surface of the outer ring top plate is seated between the protrusions provided in the frame core mold such that the interference prevention portion of the outer ring top plate is positioned at a predetermined position, thereby allowing the outer ring top plate to be seated on the frame core mold; A second step of stacking the outer ring magnet and the yoke on the outer ring top plate seated on the frame core mold in the first step; And, And a third step of insert-injecting the frame to accommodate the outer ring top plate, the outer ring magnet, and the yoke laminated to the frame core mold in the second step. 2. delete The method of claim 7, wherein In the first step, the protrusions of the frame core mold are protrusions for forming air holes in the frame.

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