KR20080043525A - Micro speaker - Google Patents

Abstract

A micro-speaker is provided to protect a human body from magnetic field by radiating the magnetic field to the outside. A frame(10) includes a reception part(11) formed at a center thereof, an extension part(13) having a plurality of first sound output holes, and a supporting part(17) formed at an outer end of the extension part. A magnet(20) has a diameter smaller than the diameter of the reception part in order to be installed inside the reception part. A plate(21) is coupled with an upper part and a lower part of the magnet. A sound coil(30) is inserted between the reception part and the magnet. A diaphragm(40) is coupled with the supporting part and a lower end of the sound coil. A protective cover(50) is coupled with the supporting part. A through-hole is formed at a center of the protective cover. A plurality of second sound output holes are formed around the through-hole. A printed circuit board(60) is coupled with a center of an outer surface of the protective cover in order to supply the power to the sound coil through the through-hole.

Description

Micro Speaker {MICRO SPEAKER}

1 is a cross-sectional view of a conventional micro speaker.

2 is an external perspective view of a micro speaker according to the present invention;

3 is an exploded perspective view of a micro speaker according to the present invention.

3a is a perspective view of an embodiment of a frame according to the invention;

Figure 4 is a cross-sectional view showing a coupling state of the micro speaker according to the present invention.

5A to 5D are graphs of numerical values shown in Tables 1 and 2;

<Description of the symbols for the main parts of the drawings>

10 frame 11 receiving portion

13 extension 15: first sound emitting hole

17: support 20: magnet

21: plate 30: acoustic coil

40: diaphragm 50: protective cover

51: through hole 53: second sound emitting hole

60: circuit board 100: micro speaker

The present invention relates to a micro speaker that can protect the human body by minimizing the transmission of the magnetic field generated in the magnet installed inside the human body.

In general, the micro speaker produces sound by shaking the air around the diaphragm which is vibrated by the attraction force and the repulsive force caused by the polarity change of the current applied to the moving coil with respect to the magnet magnetic field.

1 is a cross-sectional view of a conventional micro speaker. As shown in the drawing, the conventional micro speaker 101 includes a magnet 102 for generating a magnetic field, a plate 103 for collecting a magnetic field generated from the magnet 102, and a magnet 102 by an input electric signal. Accommodate the acoustic coil 104 by generating a magnetic field that interferes with the magnetic field to be generated, the vibration plate 105 for vibrating together to generate a sound pressure in accordance with the vibration of the acoustic coil 104, and a magnet, plate and acoustic coil Is coupled to the yoke 106 and the yoke is formed with a receiving portion 107, the cap 108 is formed with a plurality of sound emitting holes 109, through the sound emitting holes 109 formed in the cap 108 The sound generated from the micro speaker 101 is transmitted to the user.

However, in the conventional micro speaker, since the cap contacting the user is located in front of the magnet, the magnetic field generated by the magnet and the acoustic coil together with the sound is emitted through the sound generating hole. The magnetic field emitted from the micro speaker has a negative effect on the human body.

Therefore, a separate structure for protecting the human body from the magnetic field generated by the micro speaker has been required.

The present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is to provide a micro speaker that can protect the human body by minimizing the transmission of the magnetic field generated in the magnet installed therein to the human body have.

The above object is composed of a receiving portion formed in the center portion of the present invention, an extension portion extending outwardly of the receiving portion and having a plurality of arc-shaped first acoustic emission holes and a support portion formed at the outer end of the extension portion. A frame, a magnet having a diameter smaller than the diameter of the accommodation portion to be accommodated inside the housing portion, a plate coupled to the upper and lower portions of the magnet, an acoustic coil inserted between the accommodation portion and the magnet, coupled to and supported by the support portion, The diaphragm is coupled to the lower end of the acoustic coil, the protective cover is coupled to the support portion is formed in the center of the through-hole and the plurality of second sound emitting holes are formed in the periphery of the through hole and the outer cover of the protective cover through the through hole It can be achieved by a micro speaker consisting of a circuit board for supplying power to the acoustic coil.

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

2 is an external perspective view of a micro speaker according to the present invention, Figure 3 is an exploded perspective view of a micro speaker according to the present invention, Figure 3a is a perspective view showing an embodiment of a frame according to the present invention, Figure 4 is the present invention Sectional view showing a coupling state of the micro speaker according to.

As shown in Figure 2 and 3, the micro speaker 100 of the present invention is to minimize the transmission of the magnetic field generated in the magnet 10 to the human body, the frame 10 and the magnet 20, plate 21, an acoustic coil 30, a diaphragm 40, a protective cover 50, and a circuit board 60.

The frame 10 is a part in contact with the user's ear, the receiving portion 11 is formed in the center portion, the extension portion 13 extending outwardly of the receiving portion 11 and the support portion 17 formed at the end of the extension portion 13 It is composed of At this time, the receiving portion 11 may be formed to protrude to the top of the frame 10 in the shape of a circular groove having a predetermined depth.

In addition, the extension portion 13 is formed to extend outward from the end of the receiving portion 11, the first sound emitting hole 15 for transmitting the sound to the user is formed. The first acoustic emission hole 15 may be formed in an arc shape, and is divided into a plurality of radially around the receiving portion 11, and is preferably divided into four and the like. The size of the first acoustic emission hole 15 may vary depending on the volume or sound quality to be output.

Meanwhile, as illustrated in FIG. 3A, the first acoustic emission hole 15 may be divided into two in a semicircular shape.

The support 17 may be formed to protrude to the bottom of the frame 10 along the outer end of the extension 15, the inner surface is preferably formed stepped.

As described above, the frame 10 is preferably formed by bending the receiving portion 11, the extension portion 13, and the support portion 17 integrally.

The magnet 20 is formed in a disc shape having a diameter smaller than the diameter of the accommodating part 11 of the frame 10, and is installed to be located inside the accommodating part 11. Therefore, a predetermined space is formed between the inner surface of the accommodating portion 11 and the magnet 20.

The plate 21 is coupled to the upper and lower portions of the magnet 20. At this time, the plate 21 may be formed in a disk shape having the same diameter as the magnet 20, the magnetic field generated in the magnet 20 is coupled to the upper and lower portions of the magnet 20 and the receiving portion 11 and Gathered to focus on the space between the magnets (20).

The acoustic coil 30 is formed in an annular shape whose inner diameter is larger than the diameter of the magnet 20 and whose outer diameter is smaller than the inner diameter of the accommodating portion 11, and is located in the space between the accommodating portion 11 and the magnet 20. . The acoustic coil 30 vibrates by generating a magnetic field that interferes with the magnetic field generated by the magnet 20 when power is applied.

The diaphragm 40 is made of a thin thin film, the lower end of the acoustic coil 30 is coupled to the center of the upper surface and the outer end is fixed to the support (17). That is, the outer end of the diaphragm 40 is fixed to the end stepped on the inner side of the support 17.

The diaphragm 40 vibrates together in accordance with the vibration of the acoustic coil 30 to generate sound.

The protective cover 50 is coupled to the support part 17 of the frame 10, and has a through hole 51 formed at the center thereof, and a second sound emission for discharging to the outside of the through hole 51 as a sound and a magnetic field. A ball 53 is formed.

At this time, the protective cover 50 is coupled to the end stepped on the inner surface of the support 17, thereby supporting the diaphragm 40. In addition, it is preferable that a plurality of second acoustic emission holes 53 are radially separated from the through hole 51.

The circuit board 60 is for supplying and controlling power to the acoustic coil 30 and is coupled to the center of the outer surface of the protective cover 50. At this time, it is connected to the acoustic coil 30 through the through-hole 51 to supply power to the acoustic coil 30 to be operated.

Hereinafter, the present invention has the following actions and effects.

As shown in FIG. 4, in the micro speaker 100 of the present invention, a magnet 20 having a plate 21 coupled to an upper and a lower part is accommodated in an accommodating part 11 formed in a frame 10, and an acoustic coil. 30 is inserted into the space between the receiving portion 11 and the magnet 20 in a state coupled to the diaphragm 40, the outer end of the diaphragm 40 is fixed to the support () of the frame 10.

Subsequently, the protective cover 50 is coupled to the support 17 of the frame 10 and protects the circuit board 60 connected to the acoustic coil 30 through the through hole 51 of the protective cover 50. Assembled in order to engage the outer surface of the (50).

When the micro speaker 100 assembled as described above is supplied with power to the acoustic coil 30 through the circuit board 60, a magnetic field is generated in the acoustic coil 30 to interfere with the magnetic field generated in the magnet 20. While the acoustic coil 30 vibrates. Accordingly, the diaphragm 40 coupled to the acoustic coil 30 vibrates to generate sound.

In order to minimize transmission of the magnetic field inevitably generated in the process of operating the micro speaker 100 as described above, the micro speaker 100 of the present invention is provided in the receiving portion 11 of the frame 10 in contact with the user's ear. The magnet 20 is accommodated. As a result, the magnetic field is shielded from being emitted from the center portion of the frame 10 in which the accommodation portion 11 is formed. However, a small amount of magnetic field is emitted along with the sound through the first acoustic emission hole 15 formed in the extension part 13 and transmitted to the user.

The second acoustic emission hole 53 is formed in the protective cover 50 except that a small amount of magnetic fields generated in the acoustic coil 30 and the magnet 20 and emitted through the first acoustic emission hole 15 are formed in the protective cover 50. Through the sound is emitted to the other side of the user with the magnetic field can minimize the transmission to the user.

The present invention configured as described above is applied to a mobile phone, a headset, an earphone, and the like, and thus the scope of application is very broad and various very useful inventions.

<Example>

Tables 1 and 2 are numerical values of the test results of leaking magnetic fields using a measuring instrument (KANTECK TM-401 (GAUSS METER)), each of which was selected as a sample of 10 micro-speakers according to the related art and the present invention. Table 1 shows the N-pole and S-pole magnetic fields measured at the front of the micro speaker, and Table 2 shows the N-pole and S-pole magnetic fields measured at the rear.

5A to 5D are graphs of numerical values shown in Tables 1 and 2, FIG. 5A is a graph of the N-pole magnetic field shown in Table 1, and 5B is a graph of the S-pole magnetic field shown in Table 1. As shown in FIG. 5C is a graph of the N-pole magnetic field shown in Table 2, and 5d is a graph of the S-pole magnetic field in Table 1. As shown in FIG.

Here, shown A is a conventional micro speaker, B is a micro speaker of the present invention, the front surface of the micro speaker refers to the surface in contact with the user's ear, the rear surface represents the surface in the outward direction.

TABLE 1

N pole S pole NO Conventional (A) Invention (B) Conventional (A) Invention (B) One 730 30 670 20 2 700 30 650 25 3 710 25 670 15 4 720 25 680 10 5 715 30 675 20 6 720 25 670 15 7 710 30 660 10 8 720 35 670 15 9 730 30 680 10 10 710 30 670 15

TABLE 2

N pole S pole NO Conventional (A) Invention (B) Conventional (A) Invention (B) One 270 35 260 25 2 250 35 240 25 3 260 40 250 20 4 260 35 250 20 5 270 30 260 20 6 260 35 250 25 7 270 30 260 20 8 260 35 250 20 9 270 30 260 20 10 270 30 260 20

As shown in Table 1 and Figs. 5A to 5B, the N-pole magnetic field emitted to the front surface of the conventional and the present invention micro speaker has a maximum value of 730 (G), a minimum value of 700 (G), and an average value of 716.5 (G). In contrast, the present invention has a maximum value of 35 (G), a minimum value of 25 (G), and an average value of 29 (G).

In the conventional S-pole magnetic field, the maximum value is 680 (G), the minimum value is 650 (G), and the average value is 669.5 (G). In contrast, the present invention has a maximum value of 25 (G), a minimum value of 10 (G), and an average value of 15.5 (G).

Accordingly, it can be seen that the magnetic field emitted by the magnetic field of the magnetic field of the present invention is significantly reduced compared to the conventional micro speaker of the magnetic field.

As shown in Table 2 and FIGS. 5C to 5D, the N-pole magnetic field emitted to the rear of the conventional and micro speaker of the present invention has a maximum value of 270 (G), a minimum value of 250 (G), and a mean value of the conventional value. 264 (G). In contrast, the present invention has a maximum value of 40 (G), a minimum value of 30 (G), and an average value of 33.5 (G).

In the conventional S-pole magnetic field, the maximum value is 260 (G), the minimum value is 240 (G), and the average value is 254 (G). In contrast, the present invention has a maximum value of 25 (G), a minimum value of 20 (G), and an average value of 21.5 (G).

Therefore, it can be seen that the magnetic field emitted by the micro speaker according to the present invention is significantly reduced compared to the conventional micro speaker.

The present invention is not limited to the above-described embodiments, and the present invention can be embodied in other forms by those skilled in the art without departing from the spirit of the invention. All design changes made within the technical scope equivalent to the claims are considered to be included within the scope of the present invention.

As described above, according to the present invention, the magnetic field generated by the micro speaker is radiated outward to protect the human body from the magnetic field.

Claims (1)

A frame including a receiving portion formed at a central portion, an extension portion extending outwardly of the accommodation portion, and having a plurality of arc-shaped first acoustic emission holes formed therein, and a support portion formed at an outer end of the extension portion; A magnet having a diameter smaller than a diameter of the accommodation portion to be accommodated in the accommodation portion; Plates coupled to upper and lower portions of the magnet; An acoustic coil inserted between the receiving portion and the magnet; A diaphragm coupled to and supported by the support and coupled to a lower end of the acoustic coil; A protective cover coupled to the support part and having a through hole formed at a central portion thereof, wherein a plurality of second acoustic emission holes are formed around the through hole; And And a circuit board coupled to a center of an outer surface of the protective cover and configured to supply power to the acoustic coil through the through hole.

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