KR20130029850A

KR20130029850A - Eco-friendly high power micro speaker with piezo-paper

Info

Publication number: KR20130029850A
Application number: KR1020110093204A
Authority: KR
Inventors: 임인호; 오세균; 오승준; 권성욱
Original assignee: (주)에이엠엔티
Priority date: 2011-09-16
Filing date: 2011-09-16
Publication date: 2013-03-26

Abstract

PURPOSE: An eco-friendly high power micro speaker with a piezoelectric paper is provided to express a lower sound range, stably express a sound at high power, and minimize the distortion of the sound. CONSTITUTION: An eco-friendly high power micro speaker installs a vibrating unit(140a) on the top of a magnetic field unit(110a). The vibrating unit is composed of a vibrating plate(160), an edge, a suspension(150), and a voice coil(140). The vibrating plate generates a vibration. The edge is installed at a border of the vibrating plate to be placed on the top of a frame. The suspension is installed on the bottom of the vibrating plate. The voice coil is installed on the bottom of the suspension.

Description

Eco-friendly high power micro speaker with piezo-paper}

The present invention relates to an environment-friendly high-power micro speaker using piezoelectric paper, and more particularly, it is possible not only to express a lower range, but also to stably express sound even at a higher output, and to minimize the distortion of the sound so as to approximate the original sound. The present invention relates to a speaker as an eco-friendly high power micro speaker using piezoelectric paper capable of expressing sound.

The classification of the general type speaker and the micro speaker is not defined by a specific regulation, but it is generally divided into the external size and the unit's own height. In addition to the external classification, the characteristic elements for more clear classification are the criteria of the classification, the quantity of the suspension which is the braking structure of the vibration system, and the connection structure from the electrode terminal of the speaker to the voice coil.

In this case, the number of suspensions for braking the diaphragm increases as a general general full-band reproducing speaker intended for sound transmission in a general free sound field or a high functional speaker intended for extended reproduction of a large input bass sound. In addition, in the connection for supplying the electrical signal between the terminals and the voice coil, a soft copper foil having flexibility to accommodate vibrations of the vibrometer and gold wires made by twisting cotton or synthetic thread are used separately. Higher functionality that requires expansion uses more copper foil and yarn.

However, in the near-field sound field, the main purpose is to use micro-speakers that are applied to products with very limited space to be mounted such as mobile phones, notebook computers, camcorders, etc. Parts, i.e. separate suspensions and gold wires, cannot be used.

Looking at the structure of such a conventional micro-speaker, as shown in Figure 1 consists of a yoke (9) in which the permanent magnet (8) is built and an upper plate (7) bonded to the upper side of the permanent magnet (8) The magnetic circuit for generating a magnetic coil and the voice coil 5 and the voice coil 5 which are installed to be inserted inside the gap of the inner diameter side of the permanent magnet 8 so as to generate magnetic flux upon introduction of current are integrally formed. A vibrometer composed of a bonded diaphragm 2 and a primary suspension (also called an edge) 3 integrally extending from an edge of the diaphragm 2 and vibrated by a repulsive force with magnetic flux acting on a magnetic circuit, and the Electrode terminal 10 fixed to the lower end of the frame 6 and the protector fixed to the upper portion of the frame to supply power to the frame 6 and the magnetic coil and the vibration system is fixed to the voice coil 5 of the vibration system (1) With body composed of) Is configured, the yoke (9) is formed with a vent hole 12 for the transmission of sound.

In such a conventional micro speaker, the vibration of the diaphragm is braked only by the primary suspension 3 integrated in the diaphragm, and the connection between the electrode terminal 10 and the voice coil 5 also winds up the coil and leaves the remaining residual line 11. Usually, a structure that is molded and used in a semicircle is used. For this reason, as compared with the conventional large-scale high-performance speakers, the conventional micro-speakers, the greater the input electrical energy, the weaker the braking of the vibration system, the greater the vibration caused by the abnormal sound over the entire portion of the diaphragm.

In addition, since power must be supplied to two strands of the coil residual line, the main component of which is copper, of course, excessive vibration of the vibration system causes considerable progressive damage. This means that as the input energy increases, distortion of the reproduced sound increases, and progressive disconnection defects increase.

Thus, in order to solve this problem, the technology described in Patent No. 10-0419915 as shown in FIG. 2 has been developed. The technical features of the yoke 9, the permanent magnet 8, and the plate 7 And a microspeaker having a diaphragm 2 in which the primary suspension 3 is integrated, a voice coil 5, a frame 6, and a protector 1, made of a material having excellent restoring force, A secondary suspension (4) provided between the plate (7) and the diaphragm (2), wherein the voice coil (5) is located on the secondary suspension (4) so as to be located below the secondary suspension (4). And the diaphragm 2 is attached to the secondary suspension 4 so that the diaphragm 2 is positioned above the secondary suspension 4, and an edge (outer peripheral part) of the secondary suspension 4 is attached to the frame 6. It is characterized in that fixed to.

However, the technique described in Korean Patent No. 10-0419915 has an advantage that the voice coil is not disconnected even at a low output and a predetermined or higher output by attaching the secondary suspension 4 to the lower part of the diaphragm 2, but the diaphragm By attaching the secondary suspension 4 to the lower part of (2), there is a problem that the signal of the original sound is distorted, and the sound pressure of the mid range and the high range falls at the same output.

The present invention has been made to solve the above problems, an object of the present invention is to provide a suspension in the lower portion of the diaphragm, to withstand higher output in the lower low range to reproduce smooth and rich low range, piezoelectric By forming the diaphragm using paper, it reduces the distortion of sound caused by the suspension, and raises the sound pressure of the mid range and the high range. To provide a speaker.

Another object of the present invention is to form a magnet for vibrating a voice coil with a plate-shaped first magnet and a ring-shaped second magnet, thereby placing the voice coil at a spaced portion between the first magnet and the second magnet, It is to provide an eco-friendly high power micro speaker using piezoelectric paper that can increase the overall sound pressure by allowing a larger magnetic flux to act on the voice coil.

In addition, another object of the present invention is to use a piezoelectric paper as a diaphragm, not to discharge environmental pollutants, to prevent environmental pollution, and to have better piezoelectricity than a film-type piezoelectric material. To provide an eco-friendly high power micro speaker using piezoelectric paper.

SUMMARY OF THE INVENTION [0006]

A high power micro speaker comprising a frame, a magnetic field portion provided below the frame, a vibration portion provided above the magnetic field portion, and a cover provided on the upper portion of the frame, wherein the vibration portion includes a vibration plate generating vibration; It is characterized in that the edge is provided on the edge of the diaphragm is seated on the upper portion of the frame, the suspension is installed on the lower portion of the vibration plate, and the voice coil is installed on the lower portion of the suspension.

Here, the diaphragm is characterized by consisting of piezoelectric paper.

And, the upper and lower surfaces of the diaphragm is characterized in that the electrode is provided.

On the other hand, the magnetic field is characterized by consisting of a lower plate installed in the lower portion of the frame, a magnetic provided in the upper portion of the lower plate, and an upper plate provided in the upper portion of the magnetic.

In this case, the magnetic is characterized by consisting of a plate-shaped first magnetic and a ring-shaped second magnetic spaced apart from the edge of the first magnetic.

The upper plate may include a first upper plate installed on an upper surface of the first magnetic and a second upper plate installed on an upper surface of the second magnetic.

On the other hand, the lower plate is characterized in that the through-hole is formed.

The electrode may be formed at an edge of the diaphragm.

According to the present invention having the above-described configuration, by providing a suspension in the lower portion of the diaphragm, it is possible to withstand higher output in the lower low range to reproduce a smooth and rich low range, by forming the diaphragm using piezoelectric paper, It reduces the distortion of the sound due to the suspension, and increases the sound pressure of the mid and high ranges, and has the effect of reproducing more vivid and clear mid and high notes.

In the present invention, a magnet for vibrating a voice coil is formed of a plate-shaped first magnet and a ring-shaped second magnet, and the voice coil is positioned at a spaced portion between the first magnet and the second magnet. The larger magnetic flux acts to increase the overall sound pressure.

In addition, the present invention uses piezoelectric paper as the diaphragm, thereby preventing environmental pollution by not discharging environmental pollutants, as well as better piezoelectricity than a film-type piezoelectric body, lower cost, and strong external impact.

1 is a cross-sectional view of a conventional micro speaker.
2 is a cross-sectional view of a conventional improved micro speaker.
3 is a perspective view of an environment-friendly high power micro speaker using piezoelectric paper according to the present invention.
4 is a cross-sectional view of an environment-friendly high power micro speaker using piezoelectric paper according to the present invention.
5 is a partially enlarged view of a diaphragm of the high power micro speaker according to the present invention.
6 is a graph showing a change in sound pressure of an environment-friendly high power micro speaker using piezoelectric paper according to the present invention.
7 is a graph showing the frequency characteristics and the total harmonic distortion (THD) of the conventional micro-speaker.
8 is a graph showing the frequency characteristics and total harmonic distortion (THD) of the eco-friendly high-power micro speaker using a piezoelectric paper according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. The same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted. It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

3 is a perspective view of an eco-friendly high power micro speaker using piezoelectric paper according to the present invention, FIG. 4 is a cross-sectional view of an eco-friendly high power micro speaker using piezoelectric paper according to the present invention, and FIG. 5 is an eco-friendly using piezoelectric paper according to the present invention. Partial enlarged view of a diaphragm of a high power micro speaker, FIG. 6 is a graph showing a change in sound pressure of an environment-friendly high power micro speaker using piezoelectric paper according to the present invention, and FIG. 7 is a frequency characteristic and total harmonic distortion rate of a conventional micro speaker ( THD), and FIG. 8 is a graph showing the frequency characteristics and total harmonic distortion (THD) of the eco-friendly high power micro speaker using piezoelectric paper according to the present invention.

The present invention relates to an environment-friendly high power micro speaker using piezoelectric paper. As shown in FIGS. 3 to 5, the configuration includes a frame 100 and a magnetic field unit 110a installed at an inner lower portion of the frame 100. It is composed of a vibration unit 140a installed on the upper portion of the magnetic field unit 110a and a cover 180 installed on the upper portion of the frame 100.

Here, the frame 100 is formed in a rectangular cylinder shape, the top and bottom are formed to be open, the cover 180 is installed on the upper to protect the magnetic field unit 110a and the vibration unit 140a provided therein. In the corner portion of the frame 100, the guide protrusion 106 is formed to protrude upward, thereby stably fixing the cover 180.

In addition, a protective grill 190 is further provided on the upper portion of the cover 180 to prevent foreign substances such as dust from flowing into the vibrator 140a, thereby preventing the vibrator 140a from being contaminated. Done.

In addition, the vibrator 140a includes a diaphragm 160 that generates vibration, a suspension 150 installed below the diaphragm 160, and a voice coil 140 installed below the suspension 150. .

In this case, an edge 170 is attached to an edge of the diaphragm 160, and the edge 170 is seated on an upper portion of the frame 100 to install the diaphragm 160 on the frame 100.

Here, the edge 170 is formed of a material having a good restoring force, so that the diaphragm 160 stably supports the diaphragm 160 even when the vibration plate 160 vibrates strongly.

In addition, the suspension 150 is attached to a lower surface of the diaphragm 160, and the edge of the suspension 150 is also seated on the upper portion of the frame 100, between the frame 100 and the cover 190. It is fixedly installed.

In this case, the suspension 150 is formed of polyamide or polyester, which is a material for manufacturing a flexible printed circuit board (FPCB), and has a good elasticity to stably brake the vibration of the diaphragm 160. As shown in FIG. 6, even if the vibrating plate 160 is vibrated at a lower frequency range and a higher output, the rolling phenomenon of the diaphragm 160 may be prevented, thereby reproducing rich sound, and the lower portion of the suspension 150. The voice coil 140 attached to the is prevented from being disconnected.

In addition, the voice coil 140 attached to the lower surface of the suspension 150 is a voice coil by a magnetic field generated by the voice coil 140 by the magnetic flux generated from the magnetic field unit 110a and an electrical signal supplied from the outside. 140 vibrates up and down, vibrates the diaphragm 160 to reproduce sound.

On the other hand, the diaphragm 160 is formed using a piezoelectric paper, piezoelectric paper is prepared by arranging cellulose microfibers in a predetermined direction, by spin coating a solution in which cellulose pulp is dissolved by arranging by centrifugal force or in extrusion Or nano carbon is mixed with a cellulose solution in the process of arranging by electrical polarization.

These piezoelectric papers have better piezoelectricity than conventional film-type piezoelectric elements (PVDF, poly vinyl defluoride), and do not emit environmental pollutants during manufacture or disposal, thereby preventing environmental pollution. This low cost can reduce the manufacturing cost, the flexibility is not easily damaged by external impact.

In addition, electrodes 165 are provided on the upper and lower surfaces of the diaphragm 160 to transmit external electrical signals to the diaphragm 160 to vibrate the diaphragm 160.

In this case, the electrode 165 may be formed to cover the entire upper and lower surfaces of the diaphragm 160 as shown in (a) of FIG. 5, and the diaphragm 160 as shown in (c) of FIG. 5. It may be formed in a band shape along the edge of the upper and lower surfaces of the).

Thus, as shown in Figure 6, by increasing the sound pressure of the mid-high range, thereby increasing the sound pressure of the mid-high range lowered by the suspension 160, stronger and richer in the mid-high range as well as the low range Sound can be played back.

On the other hand, the magnetic field unit 110a is installed on the lower plate 110 and the magnetic plate 120 and the upper portion of the magnetic plate 120 installed on the lower portion of the frame 100. The upper plate 130 is made.

Here, the upper and lower stepped parts 102 and 104 are formed on the lower inner circumferential surface of the frame 100 at predetermined intervals, so that the magnetic field part 110a is stably installed. The lower plate 110 and the upper plate 130 are provided. The stepped portions 114 and 137 are formed at the edges of the upper and lower stepped portions 102 and 104, respectively.

In addition, the magnetic 120 is formed of a plate-shaped first magnetic 123 and a ring-shaped second magnetic 125 which is spaced apart from the edge of the first magnetic 123, the upper plate 130 The first upper plate 133 is installed on the upper surface of the first magnetic 123 and the second upper plate 135 is formed on the upper surface of the second magnetic 125.

In this case, the voice coil 140 is inserted into the spaced portion s formed by the first and second magnetics 123 and 125 and the first and second upper plates 133 and 135, and thus the first and second magnetics 123 and 125. By virtue of the magnetic flux formed by), it vibrates up and down more strongly.

That is, the conventional magnetic field unit 110a forms a magnetic flux by forming only one magnetic, so that the magnetic flux is relatively weak and the voice coil 140 has a weak force moving up and down, so that the sound pressure due to the vibration of the diaphragm 160 is weak. However, in the present invention, since the first and second magnetics 123 and 125 are provided at both sides of the voice coil 140 to form a stronger magnetic flux, the voice coil 140 is moved up and down more strongly, and thus to the diaphragm 160. The sound pressure formed by this becomes strong.

In addition, a through hole 112 is formed in the lower plate 110. The through hole 112 emits heat generated from the voice coil 140 and the magnetic field part 110a to the outside, thereby providing a micro speaker. Make it more stable to work.

On the other hand, in the present invention by attaching the suspension line 150 to the lower surface of the diaphragm 160 formed of piezoelectric paper as described above, as shown in Figure 6, the sound pressure in the mid-range and high-frequency range as well as In addition to increasing the vibration, the diaphragm 160 is not simply vibrated passively by the voice coil 140, but by using piezoelectric paper, which makes the vibration vibrate more actively according to an external signal, as shown in FIGS. 7 and 8. As described above, the wavelength distorted by the suspension 150 is more closely corrected to the original sound.

In addition, although not shown separately in the diaphragm 160 made of the voice coil 140 and the piezoelectric paper, a signal is transmitted from the outside using an electric wire, which is obvious to those skilled in the art, and thus a separate description will be omitted. .

While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the scope of the present invention is not limited to the disclosed embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

The present invention relates to an environment-friendly high-power micro speaker using piezoelectric paper, and more particularly, it is possible not only to express a lower range, but also to stably express sound even at a higher output, and to minimize the distortion of the sound so as to approximate the original sound. The present invention relates to an environment-friendly high power micro speaker using piezoelectric paper capable of expressing sound.

100: frame 102,104: upper and lower stepped parts
106: guide protrusion 110a: magnetic field
110: lower plate 112: through hole
114,137: stepped part 120: magnet
123,125: 1st, 2nd magnet 130: upper plate
133, 135: first and second upper plate 140a: vibration part
140: voice coil 150: suspension
160: diaphragm 165: electrode
170: edge 180: cover
190: protection grill

Claims

A high power micro speaker comprising a frame, a magnetic field portion provided at a lower portion of the frame, a vibration portion provided at an upper portion of the magnetic field portion, and a cover provided at an upper portion of the frame.
The vibration unit and the vibration plate for generating a vibration,
An edge installed at an edge of the diaphragm and seated on an upper portion of the frame;
Suspension is installed in the lower portion of the diaphragm,
Eco-friendly high power micro speaker using a piezoelectric paper, characterized in that consisting of a voice coil installed in the lower portion of the suspension.

The method of claim 1,
The diaphragm is an eco-friendly high power micro speaker using piezoelectric paper, characterized in that made of piezoelectric paper.

The method of claim 2,
Eco-friendly high power micro speaker using piezoelectric paper, characterized in that the electrode is provided on the upper and lower surfaces of the diaphragm.

The method of claim 1,
The magnetic field unit and the lower plate is installed in the lower portion of the frame,
A magnetic installed on an upper portion of the lower plate,
Eco-friendly high-power micro speaker using a piezoelectric paper, characterized in that consisting of an upper plate installed on top of the magnetic.

5. The method of claim 4,
The magnetic is a plate-shaped first magnetic,
Eco-friendly high power micro speaker using a piezoelectric paper, characterized in that made of a ring-shaped second magnetic spaced apart from the edge of the first magnetic.

The method of claim 5,
The upper plate and the first upper plate is installed on the upper surface of the first magnetic,
Eco-friendly high power micro speaker using a piezoelectric paper, characterized in that consisting of a second upper plate installed on the upper surface of the second magnetic.

5. The method of claim 4,
Eco-friendly high power micro speaker using piezoelectric paper, characterized in that the through-hole is formed in the lower plate.

The method of claim 3,
The electrode is an eco-friendly high power micro speaker using piezoelectric paper, characterized in that formed on the edge of the diaphragm.