KR20040014645A - Two-way micro speaker for mobile communication terminal increasing vibratory force - Google Patents

Abstract

PURPOSE: A bidirectional micro speaker for use in a mobile communication terminal to increase a vibrational force is provided to implement an optimum sound pressure level(SPL) by maximizing the vibrational force with enlarging the size of vibration plate located at the side of the tweeter/squawker unit. CONSTITUTION: A bidirectional micro speaker for use in a mobile communication terminal to increase a vibrational force includes a first permanent magnet(10), a second permanent magnet(10'), a woofer unit(100), a tweeter/squawker unit(200) and a supporting frame(300). The first permanent magnet(10) is provided with a plate(11) mounted the bottom surface thereof and the second permanent magnet(10') is provided with a plate(11') mounted on the top surface thereof. The woofer unit(100) is provided with a voice coil(50) connected to the vibration plate(40) in the magnetic space(30) formed between the first and the second permanent magnets(10,10') and the yoke(20). The tweeter/squawker unit(200) is provided with a voice coil(50') connected to the vibration plate(40') in the magnetic space(30') formed between the first and the second permanent magnets(10,10') and the yoke(20). And, the supporting frame(300) is provided with a first ventilating opening(60) penetrating to one side of the woofer unit(100) and a second ventilating opening(60') penetrating to the side of tweeter/squawker unit(200) with facing to the first ventilating opening(60) up and down.

Description

Two-way micro speaker for mobile communication terminal increasing vibratory force}

The present invention relates to a two-way micro speaker for a mobile communication terminal to increase the vibration force, and more specifically, in the patent application No. 10-2002-0082525 invention, the applicant of the present invention, in order to maximize the vibration force of the vibration plate as well as the woofer part side In addition, the present invention relates to a bidirectional micro-speaker capable of maximizing sound uniformity by efficiently forming a sound output from the tweeter / squaker part by forming a ventilation hole in the support frame of the tweeter / squeaker part and optimizing the area of the diaphragm.

In general, a speaker mounted inside a terminal is equipped with a speaker unit for generating a ring tone, a receiver unit for generating a received call sound, and a vibration motor for inducing vibration of the terminal to enable reception of a received sound and output of a dial tone. As the performance is improved, the Internet, video, MP3, and various melodies can be implemented, and thus, sound reproduction close to the original sound is required.

Therefore, the present inventors in the patent application No. 10-2002-0082525 generates a tweeter (sweeter) and squawker and a low frequency band (20Hz ~ 1KHz) that generates sound in the high, medium frequency band (1KHz or more) By combining the woofer, not only the sound of the low frequency band can be realized, but also a bidirectional micro speaker which reproduces the sound close to the original sound through the sound equalization of each frequency band (low, medium and high) has been presented. The woofer part and the tweeter / squaker part are formed of a combination of a permanent magnet, a plate, and each diaphragm equipped with yoke and a plurality of voice coils. When a current is applied to the voice coils formed as described above, the woofer part and the tweeter / squaker part The electromagnetic field is formed and the voice coil inserted into the magnetic space vibrates the diaphragm above the voice coil through Fleming's left hand law. The sound pressure is generated by the vibration of the diaphragm. At this time, there is a difference in the sound pressure band that is realized according to the vibration force of the diaphragm, so that the sound pressure band in an optimal state can be realized as the vibration force increases.

Here, the method for increasing the vibration force of the diaphragm includes a method of increasing the size of the diaphragm and the permanent magnet, or a vent forming method for smoothing the air flow during the vibration, in the case of increasing the size of the diaphragm and the permanent magnet As the size of is increased, it becomes impossible to attach it to the terminal which is gradually being miniaturized. When the air vent is formed in the support frame of the speaker, the air vent is formed only on the woofer side, and air flows only to the woofer side, and toward the tweeter / scooter side. The problem is that the smooth flow is difficult.

An object of the present invention is to solve such a conventional problem, and to form the first and second vents to one side of the support frame for supporting the permanent magnet, yoke, plate and diaphragm, the first vent is a woofer part Penetrates to the side, and the second vent is penetrated to the tweeter / squaker side, and the width of the diaphragm on the tweeter / squaker side is formed to be the same as or similar to the width of the diaphragm on the woofer side. As well as the tweeter / squaker part, the air flow is smooth to maximize the vibration force of the diaphragm, and to provide a two-way micro speaker for a mobile communication terminal that can further increase the vibration force as the size of the diaphragm increases. The purpose is.

1 is a cross-sectional view showing a conventional speaker

2 is a cross-sectional view showing an internal mounting state of the present invention.

3 is a graph showing a frequency band of a conventional speaker

4 is a graph showing a frequency band of the present invention

<Description of Symbols for Major Parts of Drawings>

10: first permanent magnet 10 ': second permanent magnet 11,11': plate

20: York 21: Through hole 30,30 ': Magnetic space part

40,40 ': Diaphragm 50,50': Voice coil 60: First vent

60 ': 2nd air vent 70: Supporting jaw 80,80': Protector

81,81 ': Sound emission hole 100: Woofer part 200: Twitter / squaker part

300: support frame: speaker

The yoke 20 is inserted between the first permanent magnet 10 on which the plate 11 is mounted at the lower end and the second permanent magnet 10 'on which the plate 11' is mounted on the upper end. 2 a woofer portion 100 into which the voice coil 50 connected to the diaphragm 40 is inserted into the magnetic space portion 30 formed between the permanent magnets 10, 10 ′ and the yoke 20; Tweeter / squash that the voice coil 50 'connected to the diaphragm 40' is inserted into the magnetic space portion 30 'formed between the first and second permanent magnets 10 and 10' and the yoke 20. Kerr 200 and; In the conventional two-way micro speaker formed by a combination of a woofer portion 100 and a support frame 300 through which the first vent hole 60 penetrates to one side, the tweeter / squaker part 200 The side diaphragm 40 'is formed to be similar to the width of the woofer part 100 side diaphragm 40, and tweeter / at a position opposite to the first vent hole 60 on one side of the support frame 300 in the vertical direction. The second vent hole 60 ′ penetrated by the squarker part 200 is molded.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention.

1 is a cross-sectional view showing a conventional speaker, Figure 2 is a cross-sectional view showing an internal mounting state of the present invention, Figure 3 is a graph showing a frequency band of a conventional speaker, Figure 4 is a graph showing a frequency band of the present invention as,

First, the first and second vents 60 and 60 'are formed on one side of the support frame 300. The first vents 60 are formed to penetrate the upper woofer portion 100 side, and the second vents ( 60 ') is molded to penetrate the tweeter / squaker part 200 side of the lower side.

A plurality of through holes 21 are formed on the surface of the support frame 300 in which the first and second vent holes 60 and 60 'are formed. &Quot; In the yoke 20, the first permanent magnet 10 is inserted into the center bottom of the yoke 20, and the plate 11 is again attached to the bottom of the yoke 20, and the yoke 20 It is formed by attaching a second permanent magnet 10 'to the outer circumferential surface of the plate and attaching the plate 11' to the upper surface of the outer periphery thereof, and the yoke 20 and the first and second permanent magnets 10 and 10 '. Are spaced apart from each other to form the magnetic space portions 30 and 30 'between the first permanent magnet 10 and the yoke 20 and between the second permanent magnet 10' and the yoke 20. .

After mounting the yoke 20 formed as described above to the support jaw 70 formed below the inner surface of the support frame 300, the voice coils 50 and 50 ′ are wound up and down the yoke 20. The diaphragm 40, 40 'is mounted, and when mounted, the voice coil 50 of the upper diaphragm 40 has a magnetic space portion 30' between the second permanent magnet 10 'and the yoke 20. Is inserted into the woofer portion 100, and the voice coil 50 ′ of the lower diaphragm 40 ′ is inserted into the magnetic space portion 30 between the first permanent magnet 10 and the yoke 20 and tweeter. It is formed of the / squar 200.

The protector 80 having a plurality of sound emitting holes 81 and 81 ′ formed on the upper and lower sides of the diaphragm 40 and 40 ′ of the woofer unit 100 and the tweeter / squaker unit 200. The 80 'is mounted to complete the bidirectional micro speaker to be implemented in the present invention.

Referring to the process of generating sound pressure in the bidirectional micro speaker formed as described above,

First, when a current is applied to the voice coils 50 and 50 ', an electromagnetic field is formed between the first and second permanent magnets 10 and 10' and the yoke 20, and the magnetic space part 30 is caused by the electromagnetic field. The voice coils 50 and 50 'inserted into the 30' vibrate the diaphragms 40 and 40 'above the voice coils 50 and 50' by Fleming's left hand law.

When the vibration is increased by the first ventilation hole 60 formed in the support frame 300, the vibration force of the diaphragm 40 on the woofer part 100 side can be increased to implement an optimized low sound pressure band, and the second ventilation hole 60 ') By increasing the vibration force of the diaphragm 40' of the tweeter / squar portion 200 side can realize an optimized high and medium pressure band, the plurality of through holes 21 formed on the surface of the yoke 20 By the air of the woofer unit 100 side and the tweeter / squar unit 200 is exchanged with each other at the same time a part of the bass of the woofer unit 100 is output to the tweeter / squar unit 200 or the tweeter / squar unit 200 Some of the high and middle sound is output to the woofer part 100, and the high, medium and low frequency characteristics are significantly improved.

As described above, the sound pressure in the optimal state is emitted to the outside of the terminal through the sound emitting holes 81 and 81 'formed in the protectors 80 and 80' to deliver high quality sound to the receiver.

Thus, in the present invention, unlike the conventional two-way micro speaker (a) in which the first vent hole 60 is formed only on the woofer part 100 side, the second vent hole 60 'is also formed on the tweeter / scooter part 200 side. At the same time, the vibration plate 40 ′ of the tweeter / squaker unit 200 side may be enlarged from the existing size to maximize the vibration force by forming substantially similar to the size of the woofer unit 100 side diaphragm 40. In addition, due to the maximization of the vibration force as shown in FIG. 3 or 4, the broadband reception area is expanded as compared to the conventional two-way speaker, and thus it can be seen that the high frequency, the medium frequency, and the low frequency have a more uniform distribution. Therefore, high quality sound reproduction is possible.

As described above, the present invention forms a second vent in the support frame in which the first vent is formed on the woofer side so as to be opposed to the first vent in the up and down direction to smooth the flow of air not only to the woofer side but also to the tweeter / scooter side. In addition, the size of the tweeter / scooter side diaphragm can be enlarged to maximize the vibration force even more to realize the sound pressure band of the optimal state.

Claims (1)

The yoke 20 is inserted between the first permanent magnet 10 on which the plate 11 is mounted at the lower end and the second permanent magnet 10 'on which the plate 11' is mounted on the upper end. 2 a woofer portion 100 into which the voice coil 50 connected to the diaphragm 40 is inserted into the magnetic space portion 30 formed between the permanent magnets 10, 10 ′ and the yoke 20; Tweeter / squash that the voice coil 50 'connected to the diaphragm 40' is inserted into the magnetic space portion 30 'formed between the first and second permanent magnets 10 and 10' and the yoke 20. Kerr 200 and; In the conventional two-way micro speaker formed by a combination of a woofer portion 100 and a support frame 300 through which the first vent hole 60 penetrates to one side, the tweeter / squaker part 200 The side diaphragm 40 'is formed to be similar to the width of the woofer part 100 side diaphragm 40, and tweeter / at a position opposite to the first vent hole 60 on one side of the support frame 300 in the vertical direction. The second ventilation hole 60 ′ penetrated by the squaker part 200 is molded, and the bidirectional micro speaker for a mobile communication terminal to increase the vibration force.