KR20040069669A - Leakage magnetic flux decrease speaker - Google Patents

Abstract

PURPOSE: A speaker for decreasing the leakage magnetic flux is provided to increase the output sound pressure level and the efficiency of the speaker by increasing the efficiency of the magnetic circuit of the speaker. CONSTITUTION: A speaker for decreasing the leakage magnetic flux includes a magnet(20), a pole piece(30), a frame(40), a voice coil(50), a vibrational plate(60), a damper(70), a space(110), a connection protrusion(120), a supporting plate(130) and a yoke(100). The space(110) is formed on the bottom of the speaker. The connection protrusion(120) is formed on the top of the peripheral surface. The supporting plate(130) is formed on the bottom inside of the space(110). And, the yoke(100) is provided with a fixing groove having a size corresponding to the magnet, wherein the fixing groove is formed on the supporting plate(130).

Description

Leakage flux reduction speaker {LEAKAGE MAGNETIC FLUX DECREASE SPEAKER}

The present invention relates to a speaker, and more particularly, to a leakage flux reducing speaker for converting a leakage magnetic flux of a speaker magnetic circuit into a main magnetic flux to increase the efficiency of the speaker's magnetic circuit to increase an output sound pressure level and efficiency of the speaker.

Generally, a speaker generates a magnetic field from a magnet, and a magnetic loop is formed through a plate and a yoke. When a current flows through a voice coil placed in an air gap, the voice coil vibrates due to the interaction between the current and the magnetic field. In response to this vibration, a diaphragm coupled to the voice coil (also called "conji") generates an acoustic signal and makes a sound.

A conventional speaker constituting the above operation will be described with reference to FIG. 1.

1 is a cross-sectional view showing a speaker according to the prior art, having a space 11 having an upper portion opened at a lower end thereof, having a coupling protrusion 12 protruding from an upper end of an outer circumferential surface thereof, and an inner bottom surface of the space 11 In the U-shaped yoke 10 in which the support plate 13 is bent upwards, the magnet 20 attached to the space bottom support plate 11 of the yoke 10, and the upper surface of the magnet 20. The pole piece 30 is attached, the frame 40 to which the yoke 10 is coupled to form the exterior of the speaker, and a winding portion and a bobbin positioned in a space portion between the yoke 10 and the pole piece 30. One end is attached to each side of the voice coil 50 and the bobbin formed on the upper part of the voice coil 50, and the other end is made of a diaphragm 60 and a damper 70 coupled to the frame 40. In the drawings, reference numeral 80 denotes a center cap and 90 denotes a gasket assembly.

On the other hand, look at the coupling of the yoke and the frame in more detail, the coupling groove 41 that can be coupled to the coupling projection 12 of the yoke 10 is formed in the bottom of the frame 40, the yoke 10 A coupling protrusion 12 is formed at an end, that is, an upper end of the outer circumferential surface thereof, so that the coupling protrusion 12 of the yoke 10 is inserted into the coupling groove 41 of the frame 40 and bonded or bonded by an injection insert method.

Referring to the operation of the conventional speaker having the above configuration, first, the magnetic field generated from the magnet 20 passes through the air gap which is a space portion between the yoke 10 and the pole piece 40 through the pole piece 30 and the yoke 10. When the magnetic flux flows through the coil and the electric current flows through the voice coil 50 placed in the air gap, and a driving force is generated and transmitted to the diaphragm 60 and the damper 70, the diaphragm 60 and the damper 70 are voiced. In response to the driving force of the coil 50 to vibrate, the vibration of the vibration plate 60 and the damper 70 eventually generates an acoustic signal to generate sound waves.

However, such a conventional speaker is a magnet having a magnet having a high coercivity, a high magnetic flux density Alnico, or a neodymium, not a ferrite magnet. Use speakers in the coil.

In the case of a speaker using such a magnetic magnet, high-density magnetic flux is emitted in a narrow area (ferrite magnets emit a low-density magnetic flux in a large area), and thus, a high-density leakage magnetic flux is generated, resulting in a decrease in output of the speaker.

Accordingly, an object of the present invention is to solve the above problems, by changing the yoke or pole piece into a shape that can enclose the leakage flux of the magnet to convert the leakage magnetic flux of the speaker magnetic circuit into the main magnetic flux of the speaker By increasing the efficiency of the speaker to increase the output sound pressure level and efficiency.

1 is a cross-sectional view showing a speaker according to the prior art

2 is a cross-sectional view showing the configuration of a leakage flux reducing speaker according to a first embodiment of the present invention.

3 is a cross-sectional view showing the configuration of a leakage flux reducing speaker according to a second embodiment of the present invention.

4 is a cross-sectional view showing the configuration of a leakage flux reducing speaker according to a third embodiment of the present invention.

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

10, 100: York 11, 110: Space part

12, 120: engaging projection 13, 130: support plate

20: magnet 30, 300: pole piece

140, 310: fixing groove

Features of the present invention for achieving the above object,

In a speaker comprising a magnet, a pole piece, a frame, a voice coil, a diaphragm and a damper,

A space portion having an upper portion opened at a lower end thereof has a coupling protrusion at an upper end of an outer circumferential surface thereof, and a support plate is bent upwardly at an inner bottom surface of the space portion, and a fixing groove having a size corresponding to the magnet is mounted on the support plate. It characterized in that it comprises a yoke formed.

Another feature of the invention,

In a speaker including a yoke, a magnet, a frame, a voice coil, a diaphragm and a damper,

It characterized in that it comprises a pole piece in which a fixing groove of a size corresponding thereto is formed so that the magnet is seated on the bottom surface.

Another feature of the invention,

In the speaker comprising a magnet, a frame, a voice coil, a diaphragm and a damper,

A space portion having an upper portion opened at a lower end thereof, having a coupling protrusion at an upper end of an outer circumferential surface thereof, and having a support plate bent upward from an inner bottom surface of the space portion, the first fixing having a size corresponding to the magnet being seated on the support plate; A grooved yoke,

And a pole piece having a second fixing groove having a size corresponding thereto so that the magnet is seated on a bottom surface thereof.

Hereinafter, the configuration of a leakage flux reducing speaker according to embodiments of the present invention will be described in detail with reference to FIGS. 2 to 4. 2 to 4, the same parts as those of the speaker shown in FIG. 1 are denoted by the same reference numerals as in FIG.

First Embodiment

2 is a cross-sectional view showing the configuration of a leakage flux reducing speaker according to a first embodiment of the present invention.

Referring to FIG. 2, the yoke 100 of the leakage flux reducing speaker according to the present invention includes a space 110 having an upper portion opened at a lower end thereof, a coupling protrusion 120 formed at an upper end of an outer circumferential surface thereof, and a space portion 110. The support plate 130 is bent upward from the inner bottom of the bottom), and a fixing groove 140 having a size corresponding thereto is formed so that the magnet 20 is seated on the support plate 130.

Meanwhile, the lower end of the magnet 20 is seated and fixed to the fixing groove 140 of the yoke 100 by an adhesive.

As the yoke 100 is wrapped around the end of the magnet 20 as described above, the side leakage magnetic flux of the magnet 20 is converted into the main magnetic flux by the yoke 100 so that the magnet 20, the yoke 100, and the pole piece ( The magnetic flux density of the magnetic circuit composed of 30) becomes high. Meanwhile, the operation of the speaker is the same as that of the conventional speaker.

Second Embodiment

3 is a cross-sectional view showing the configuration of a leakage flux reducing speaker according to a second embodiment of the present invention.

Referring to FIG. 3, the pole piece 300 of the leakage magnetic flux reducing speaker according to the present invention has a fixing groove 310 having a size corresponding thereto so that the magnet 20 is seated on a bottom surface thereof.

Meanwhile, the upper end of the magnet 20 is fixed to the fixing groove 310 of the pole piece 300 by an adhesive.

As the pole 20 is wrapped around the end of the magnet 20 as described above, the side leakage magnetic flux of the magnet 20 is converted into the main magnetic flux by the pole piece 300, the magnet 20 and the yoke 100 and the pole The magnetic flux density of the magnetic circuit composed of the pieces 300 is increased. Meanwhile, the operation of the speaker is the same as that of the conventional speaker.

Third Embodiment

4 is a cross-sectional view showing the configuration of a leakage flux reducing speaker according to a third embodiment of the present invention.

Referring to FIG. 4, the yoke 100 of the leakage flux reducing speaker according to the present invention includes a space 110 having an upper portion opened at a lower end thereof, a coupling protrusion 120 formed at an upper end of an outer circumferential surface thereof, and a space portion 110. The support plate 130 is bent upward from the inner bottom of the bottom), and the first fixing groove 140 having a size corresponding thereto is formed so that the magnet 20 is seated on the support plate 130.

In addition, the pole piece 300 is formed with a second fixing groove 310 having a size corresponding thereto so that the magnet 20 is seated on the bottom surface.

Meanwhile, the lower and upper ends of the magnet 20 are seated and fixed to the first fixing groove 140 of the yoke 100 and the second fixing groove 310 of the pole piece 300 by an adhesive.

The yoke 100 and the pole piece 300 are wrapped around the ends of the magnet 20 as described above, so that the side leakage magnetic flux of the magnet 20 is converted into the main magnetic flux by the yoke, so that the magnet 20 and the yoke 100 and The magnetic flux density of the magnetic circuit composed of the pole pieces 300 is increased. Meanwhile, the operation of the speaker is the same as that of the conventional speaker.

Therefore, by simply changing the shape of the yoke and pole piece to convert the magnetic flux of the magnet leakage into the main magnetic flux, it is possible to increase the efficiency of the speaker's magnetic circuit to increase the output sound pressure level of the speaker.

As described above, according to the leakage magnetic flux reducing speaker according to the present invention, the magnetic circuit of the speaker is changed by changing the yoke or pole piece into a shape that can enclose the magnetic flux of the magnet and converting the leakage magnetic flux of the speaker magnetic circuit into the main magnetic flux. By increasing the efficiency of the output sound pressure level and efficiency of the speaker can be increased.

Claims (3)

In a speaker comprising a magnet, a pole piece, a frame, a voice coil, a diaphragm and a damper, A space portion having an upper portion opened at a lower end thereof has a coupling protrusion at an upper end of an outer circumferential surface thereof, and a support plate is bent upwardly at an inner bottom surface of the space portion, and a fixing groove having a size corresponding to the magnet is mounted on the support plate. Leakage reduction speaker characterized in that it comprises a yoke formed. In a speaker including a yoke, a magnet, a frame, a voice coil, a diaphragm and a damper, And a pole piece having a fixing groove having a size corresponding to that of the magnet to be seated on a bottom surface thereof. In the speaker comprising a magnet, a frame, a voice coil, a diaphragm and a damper, A space portion having an upper portion opened at a lower end thereof, having a coupling protrusion at an upper end of an outer circumferential surface thereof, and having a support plate bent upward from an inner bottom surface of the space portion, the first fixing having a size corresponding to the magnet being seated on the support plate; A grooved yoke, And a pole piece having a second fixing groove having a size corresponding thereto to seat the magnet on a bottom surface thereof.