KR20020039057A - Speaker having multi voice coil driving unit - Google Patents

Abstract

PURPOSE: A high efficiency and high power speaker is provided to form multiple magnetic gaps using a magnet, and to arrange reinforcement ribs on a center and a body of a vibration plate in mutual cross directions to make multiple voice coils inserted in each magnetic gap. Accordingly, the distortion of the vibration plate at high power can be prevented. CONSTITUTION: A cylindric frame(21) limits a predetermined space. A yoke(22) is fixed in an open lower part and a radial inside of the frame(21) and has an external shape corresponding to the internal radial shape of the frame(21). In the yoke(22), a base(22a) is flat, a vertical fixed protuberance(22d) is projected in a center of the base(22a), a vertical side wall(22c) is upward projected in an external circumference of the base(22a), and a shoulder(22b) is formed between the base(22a) and the side wall(22c) in a step shape. A plate(24) arranged on an open upper part of the yoke(22) has an aperture to insert the fixed protuberance(22d) in a center. And the plate(24) has a first gap between an external circumference and an upper radial inside of the side wall(22c), and a second gap between an internal circumference and an external surface of the fixed protuberance(22d). A vibration plate(26) is curved from an upper part of the plate(24) in a dome shape at a predetermined distance, and has a vibration plate edge(26c) distant from an upper part of the side wall(22c). Voice coils(25a,25b) are arranged in the gaps with a part of the vibration plate(26). And a magnet(23) is arranged within a magnetic gap(G) limited by the yoke(22) and the plate(24), and configures a magnetic circuit with the yoke(22) and the plate(24).

Description

High efficiency high power speaker {Speaker having multi voice coil driving unit}

The present invention relates to a speaker, and more particularly, to a central portion and a main body portion of a diaphragm formed in an uneven shape so that multiple magnetic gaps can be formed using magnets and multiple voice coils can be inserted into each magnetic gap. The present invention relates to a speaker that provides high efficiency and high output by arranging reinforcing ribs in a staggered direction.

3 shows a structure of a speaker according to the prior art.

Referring to FIG. 3, the conventional speaker 10 includes a frame 11, a metal yoke 12, a magnet 13, a plate 14, and an outer periphery of the magnet 13 and a lower edge of the plate 14. It consists of the voice coil 15 and the diaphragm 16 which are fitted.

The speaker 10 has an upper side of the metal yoke 12 to prevent the magnet 13 from being detached from the metal yoke 12 or the plate 14 from the magnet 13 during assembly or use. Plastic fillers having a cylindrical shape are injected into the empty space around the outer space, and column bosses 17 are disposed in the through holes of the metal yoke 12, the magnet 13, and the plate 14.

By the way, the speaker 10 is a structure having a magnetic gap and a voice coil to increase the input to increase the output, at this time heat is generated in the voice coil 15 is limited to increase the input. In addition, when the voice coil 15 located in the central portion vibrates up and down, only the central portion vibrates up and down while the circumferential outer portion of the diaphragm 16 is supported, so that the diaphragm 16 is crushed or the voice coil 15 is crushed. A phenomenon in which the adhesive portion of the diaphragm 16 is separated occurs, and as a result, a distortion occurs in which sound is distorted at high power.

The present invention has been made to solve the above-mentioned conventional problems, an object of the present invention is to form a multi-magnetic gap using a magnet and to have a concave-convex shape so that multiple voice coils can be inserted into each magnetic gap. By placing the reinforcing ribs in a staggered direction, respectively, in the center part and the main body part of the formed diaphragm, a high efficiency and high power speaker capable of preventing distortion of the diaphragm at high power and ultimately suppressing sound distortion at high power. To provide.

1 is a plan view of a speaker according to a preferred embodiment of the present invention;

2 is a longitudinal sectional view of a speaker according to a preferred embodiment of the present invention, and

3 is a longitudinal sectional view of a speaker according to the prior art.

<Explanation of symbols for main parts of drawing>

10,20: speaker 11,21: frame

12,22: York 13,23: Magnet

14,24 plate 15,25a, 25b voice coil

16,26: diaphragm 22d: fixed protrusion

28: lead wire 31: electrode terminal plate

G: magnetic gap

In order to achieve the above object, the present invention,

A cylindrical frame defining a constant space;

Fit to the open lower portion of the frame and radially inward, and has an outer surface corresponding to the radial inner surface of the frame, a flat base, a vertical fixed protrusion formed to protrude in the center of the base, the upper portion in the outer peripheral portion of the base A yoke having a vertical sidewall protruding from the base and a shoulder formed in a stepped shape between the base and the sidewall;

It is disposed in the open upper portion of the yoke, an opening for receiving the fixed protrusion is formed in the center, a first gap is formed between the outer peripheral portion and the upper radial inner surface of the side wall, the outer peripheral portion and the outer surface of the fixed protrusion A plate having a second gap formed therebetween;

A diaphragm that is bent in a dome shape on the plate and spaced apart by a predetermined distance, and includes a diaphragm edge spaced apart by a predetermined distance from the upper sidewall;

A plurality of voice coils fixedly disposed together with a portion of the diaphragm in the gaps; And

It is provided in the magnetic gap defined by the yoke and the plate, and provides a high efficiency and high power speaker comprising a magnet constituting a magnetic circuit together with the yoke and the plate.

The first reinforcing ribs are provided on the diaphragm in a radially inward position of the diaphragm edge, and the first reinforcing ribs are converged radially inwardly in the shape of a rotary comb pattern, and a second reinforcing rib is radially inward of the first reinforcing ribs. It is provided in a shape that converges radially inward in shape. At this time, the second reinforcing ribs are formed in a direction opposite to the convergence direction of the first reinforcing ribs, the first reinforcing ribs and the second reinforcing ribs maintain the strength of the diaphragm to warp the diaphragm at high power. It performs the function of preventing.

As mentioned above, the speaker according to the present invention uses a magnet to form a plurality of magnetic gaps, and inserts a plurality of voice coils together with a portion of the diaphragm into the gaps between the plate and the yoke, thereby increasing the internal input. It prevents heat generation of voice coil and solves the problem of separation of adhesive part between voice coil and diaphragm.

In addition, by arranging reinforcing ribs in a staggered direction inside and outside of the diaphragm, the diaphragm is prevented from being deformed at high power and noise distortion is suppressed as much as possible.

Hereinafter, a speaker according to the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a plan view and a longitudinal sectional view of a speaker according to an embodiment of the present invention.

1 and 2, the speaker 20 according to a preferred embodiment of the present invention has a cylindrical shape and includes a frame 21 forming sidewalls of the speaker 20. The frame 21 is made of nonmagnetic material, and the yoke 22 is fitted to the open lower portion and the radially inner side of the frame 21. At this time, the outer peripheral portion of the yoke 22 has an outer surface shape corresponding to the radial inner surface shape of the frame 21. Thus, the yoke 22 is tightly coupled on the radially inner surface of the frame 21.

The yoke 22 is a case for concentrating magnetic flux in the speaker 20 and is made of cast iron or cast steel. At this time, the yoke 22 has a flat base 22a, a vertical fixed protrusion 22d formed to protrude in the center of the base 22a, and a vertical side wall 22c protruding upward in the outer peripheral portion of the base 22a. And a shoulder 22b formed in a stepped shape between the base 22a and the side wall 22c.

At the open top of the yoke 22 an annular plate 24 is arranged. In other words, the plate 24 is fitted between the inside of the radial side wall 22c of the yoke 22 and the fixed protrusion 22d. For this purpose, an opening (not shown) is formed through the center of the plate 24. When the plate 24 is disposed on the open top of the yoke 22, a first gap of a certain interval is formed between the outer circumference of the plate 24 and the inner surface of the side wall 22c of the yoke 22, which is the first gap. In the following, a part of the diaphragm 26 to be described below is inserted into the uneven shape, and the first voice coil 25a is disposed upright inside the diaphragm 26 curved in the uneven shape. Similarly, a second gap is formed between the inner circumferential portion of the plate 24 and the outer surface of the fixed protrusion 22d of the yoke 22, in which a part of the diaphragm 26 is inserted into a concave-convex shape. The second voice coil 25b is disposed upright inside the diaphragm 26 curved in an uneven shape corresponding to the second gap.

The first voice coil 25a and the second voice coil 25b are electrically connected to each other by the lead wire 28, and provide vertical driving force by a negative current supplied from the outside. At this time, the lead wire 28 is disposed inside the diaphragm 26 which is bent in a dome shape on the plate 24 and spaced apart by a predetermined distance.

The diaphragm 26 vibrates up and down by the driving force of the voice coils 25a and 25b to transmit sound energy to the outside. The diaphragm 26 has diaphragm edges 26c spaced a certain distance above the side wall 22c of the yoke 22. The diaphragm edge 26c is curved in a dome shape so that the vibration of the diaphragm 26 is performed smoothly.

A first reinforcing rib 26a is provided on the diaphragm 26 in a radially inner position of the diaphragm edge 26c in a radially converging manner in the shape of a rotary comb. In addition, the second reinforcing rib 26b is formed in a radially inner side of the first reinforcing rib 26a in a radially converging shape in the shape of a rotary comb pattern. At this time, the second reinforcing rib 26b is formed in a direction opposite to the convergence direction of the first reinforcing rib 26a. The first reinforcing ribs 26a and the second reinforcing ribs 26b maintain the strength of the diaphragm 26 to prevent distortion of the diaphragm 26 at high power.

On the other hand, an electrode terminal plate 31 for receiving current from an external power supply (not shown) is formed on the bottom outer surface of the frame 21, and one end of a coil (not shown) is soldered to the electrode terminal plate 31. It is fixed. The coil extends past the yoke 22 into the magnetic gap G of the speaker 20, and the other end of the coil thus extended is connected to the lower end of the first voice coil 25a.

When a current is applied from the external power supply to the electrode terminal plate 31 so that a current is supplied from the electrode terminal plate 31 along the coil to the first voice coil 25a, the second voice coil continues through the lead wire 28. Current is supplied to 25b, and as a result, the first voice coil 25a and the second voice coil 25b induce a change in the magnetic field from the voice signal electrical energy.

On the other hand, an annular magnet 23 is disposed in the magnetic gap G defined by the yoke 22 and the plate 24. The magnet 23 is disposed such that the lower end on one side of the magnetic gap G is adjacent to the shoulder 22b of the yoke 22.

The magnet 23 and the plate 24 together with the yoke 22 constitute a magnetic circuit. The lower surface of the magnet 23 is in close contact with the upper surface of the base 22a of the yoke 22, and the upper surface of the magnet 23 is in close contact with the lower surface of the plate 24.

The operation of the speaker 20 according to the present invention configured as described above will be described briefly.

If a current is applied from the external power supply to the electrode terminal plate 31 so that a current is supplied from the electrode terminal plate 31 to the first voice coil 25a along the coil, the second wire through the lead wire 28 continues. Current is supplied to the voice coil 25b, and as a result, the first voice coil 25a and the second voice coil 25b induce a change in the magnetic field from the voice signal electrical energy.

That is, when a current is applied to the first voice coil 25a and the second voice coil 25b, the magnetic circuit and voice coils 25a and 25b composed of the plate 24, the magnet 23 and the yoke 22 and Fleming's left-hand law is established by the generation of a magnetic field between.

Then, while the voice coils 25a and 25b are fixed, magnetic fields formed between the voice coils 25a and 25b, the plate 24, the magnet 23, and the yoke 22 mutually exert an attraction force and repulsive force on each other. The plate 24, the magnet 23, and the yoke 22, which are integrally coupled magnetic circuits, vibrate up and down. This vibration is transmitted to the diaphragm 26 so that the diaphragm 26 can be shaken.

As mentioned above, the speaker according to the preferred embodiment of the present invention, unlike the existing speaker structure, in order to meet the recent trend of miniaturization, the magnet is formed using a plurality of magnetic gaps and a plurality of voice coils By inserting a portion of the diaphragm together with the gap between the plate and the yoke, thereby preventing heat generation of the voice coil due to an increase in the input, thereby solving the problem of separation between the voice coil and the diaphragm.

In addition, the internal input can be increased through the heat dissipation effect by multiple voice coils, and since the inside and the outside of the diaphragm are driven at the same time, the diaphragm can be prevented from being distorted at high power, so that the sound is distorted even at high power. I got an effective magnetic circuit without this. As a result, the speaker's efficiency is greatly improved. Furthermore, reinforcing ribs in staggered directions are disposed on the inside and outside of the diaphragm to prevent the diaphragm from crushing at high power and to suppress crushing of the sound as much as possible.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims below. It will be appreciated.

Claims (5)

A cylindrical frame 21 defining a predetermined space; Fit to the open lower portion of the frame 21 and the radially inner side, and has an outer surface corresponding to the radial inner surface of the frame 21, formed to protrude in the center of the flat base 22a, the base 22a A vertical fixing protrusion 22d, a vertical side wall 22c protruding upwardly on the outer circumference of the base 22a, and a shoulder 22b formed stepwise between the base 22a and the side wall 22c. Yoke 22 having; It is disposed in the open upper portion of the yoke 22, an opening is formed in the center for accommodating the fixing protrusion 22d, and a first gap is formed between the outer circumferential portion and the upper radial inner surface of the side wall 22c. A plate 24 formed between the inner circumferential portion and the outer surface of the fixed protrusion 22d; A diaphragm 26 which is bent in a dome shape on the plate 24 and spaced apart by a predetermined distance, and has a diaphragm edge 26c spaced apart by a predetermined distance from the top of the side wall 22c; A plurality of voice coils 25a and 25b fixedly disposed together with a portion of the diaphragm 26 in the gaps; And A magnet 23 disposed in the magnetic gap G defined by the yoke 22 and the plate 24 and including the yoke 22 and the plate 24 to form a magnetic circuit. High efficiency high power speaker characterized by. The diaphragm 26 of claim 1, wherein a part of the diaphragm 26 is inserted into the uneven shape in the first gap, and the first voice coil 25a is placed upright inside the diaphragm 26 curved in the uneven shape. In the second gap, a part of the diaphragm 26 is inserted into the uneven shape, and the second voice coil 25b is erected inside the diaphragm 26 curved in the uneven shape corresponding to the uneven groove. High efficiency, high power speaker, characterized in that arranged. The frame of claim 2, wherein the first voice coil 25a and the second voice coil 25b are electrically connected to each other by a lead wire 28 disposed inside the diaphragm 26. An electrode terminal 31 for receiving a current from an external power supply is installed on the bottom outer surface of the bottom 21, and one end of the coil is soldered and fixed to the electrode terminal 31, and the other end of the coil is the first voice coil. A high efficiency high power speaker, characterized in that connected to the bottom of (25a). The diaphragm 26 of claim 1, wherein a first reinforcing rib 26a is provided on the diaphragm 26 in a radially inner position of the diaphragm edge 26c so as to converge radially inward in the shape of a rotary comb. A high efficiency high power speaker, characterized in that the second reinforcing rib (26b) is provided in the form of a rotary comb pattern radially inwardly converging in the radially inside the reinforcing rib (26a). The method of claim 1, wherein the second reinforcing rib (26b) is formed in a direction opposite to the convergence direction of the first reinforcing rib (26a), the first reinforcing rib (26a) and the second reinforcing rib (26b) The high efficiency and high power speaker, characterized in that to maintain the strength of the diaphragm 26 to prevent distortion of the diaphragm 26 at high power.