KR100897794B1 - Speaker unit and mobile terminal having it - Google Patents

Abstract

The present invention relates to a speaker unit and a portable terminal including the speaker unit. A chamber which supports the sound generation unit and emits a first sound generated from the front of the sound generation unit forward and forms a closed space behind the sound generation unit; And a take-off tube connected to the chamber so as to communicate with the closed space and guiding the second sound generated from the rear surface of the sound-producing part, whereby the first sound generated from the front surface of the sound- It is possible to improve the bass sound performance by reducing the influence due to the interference between the generated second sounds.

Cell phones, mobile phones, handsets, speakers

Description

TECHNICAL FIELD [0001] The present invention relates to a speaker unit and a portable terminal having the speaker unit.

1 is a sectional view showing a speaker portion of a portable terminal according to a conventional technique,

2 is a perspective view of a portable terminal according to a first embodiment of the present invention,

3 is a cross-sectional view taken along line I-I of the portable terminal of FIG. 2,

FIG. 4 is a cross-sectional view taken along line II-II of FIG. 3,

5 is a cross-sectional view of a portable terminal having a plurality of outflow pipes as a second embodiment according to the present invention,

6 is a cross-sectional view of a mobile terminal having a draw-out tube capable of adjusting a length according to a third embodiment of the present invention,

FIG. 7 is a perspective view of a portable terminal according to a fourth embodiment of the present invention,

8 is a cross-sectional view taken along line III-III of the portable terminal of FIG.

Description of the Related Art [0002]

10: portable terminal 13A, 13B: terminal housing

11, 12: Through hole 20: Speaker unit

22: chamber 23:

24: sealed space 25: opening

28: Hermetically sealed member 30: Drawing tube

31: opening

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker unit and a portable terminal including the speaker unit, and more particularly, to a speaker unit and a portable terminal having the speaker unit.

2. Description of the Related Art A portable terminal including a mobile communication terminal and a PDA (Personal Digital Assistant) is one of portable electronic devices that allows a user to transmit / receive information or view / process information wirelessly while using the portable terminal.

Recently, thanks to the development of information communication technology and memory technology, mobile terminals are in the process of producing multimedia or transmitting / receiving multimedia in addition to the call function. A digital camera may be installed to photograph or transmit or view a picture or a multimedia file such as a music, a movie or a game, and further to receive digital multimedia broadcasting using satellite communication or terrestrial broadcasting It also has the ability to be able to.

In order to allow such a multimedia to be appreciated through the portable terminal, the speaker mounted on the portable terminal is being developed to provide a higher acoustic performance. At the same time, since the portable terminal has been made lighter and slimmer so that the portable terminal can be easily carried by the user, it is required to minimize the unnecessary space for the portable terminal by the speaker device.

Hereinafter, a speaker device of a portable terminal according to the related art will be described.

1 is a cross-sectional view illustrating a speaker portion of a portable terminal according to a conventional technique. 1, the portable terminal 1 is provided with first and second housings 2 and 3 which support internal components and constitute an outer appearance. On the inner surface of the second housing 3, The device 6 is fixed.

A through hole 5 is formed in the second housing 3 so as to allow the sound A emitted from the front of the speaker device 6 to pass therethrough so that the sound wave is emitted to the outside through the through hole 5 .

A speaker fixing rib 4 is formed on the inner surface of the second housing 3 so as to fix the speaker device 6. The sound emitted from the front of the speaker device 6 leaks into the interior of the portable terminal And is in close contact with the rib 4 so as not to come off.

A gasket 7 is provided on the inner side of the rib 4 so as to ensure the fixability and adhesion of the speaker device 6.

According to this configuration, the speaker device 6 generates sounds A and B according to a signal transmitted from the substrate 8 provided inside the housings 2 and 3, and delivers the sounds to the user.

However, according to this conventional technique, the sound A emitted to the front of the speaker device 6 is reflected by the sound B having the opposite phase, which is generated on the rear surface of the diaphragm (not shown in detail) inside the speaker device 6, There is a problem that the performance of the speaker 6 is deteriorated as a whole. That is, in the case of the bass band, since the diffracting property is strong, there is a problem that a canceling effect is caused by the mixing of the sound A generated in the forward direction and the sound B generated in the backward phase which is opposite in phase.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a speaker unit having excellent bass performance and a portable terminal having the speaker unit.

Another object of the present invention is to minimize the influence of the speaker device on the miniaturization of the portable terminal.

According to an aspect of the present invention, A chamber supporting the sound emitting unit and emitting a first sound generated from the front of the sound emitting unit forward and forming a sealed space behind the sound emitting unit; And a takeout pipe connected to the enclosed space of the chamber and configured to guide a second sound generated from the rear surface of the sound emitting portion, and a portable terminal having the speaker unit. do.

In a preferred embodiment of the present invention, the length L of the take-out tube may be a length that can invert the phase of the second sound.

The draw-out pipe is formed as a flexible type, thereby increasing the mounting and space usability of the portable terminal and making the portable terminal slimmer.

The take-out tube may further include a length adjuster for adjusting the length L, and may be formed to be spaced apart from the chamber.

Hereinafter, a speaker unit according to the present invention and a portable terminal having the same will be described in detail with reference to the accompanying drawings.

2 is a perspective view of a mobile terminal according to a first embodiment of the present invention. Referring to FIG. 2, the portable terminal 10 forms an outer appearance by assembling the upper housing 13A and the lower housing 13B.

A keypad 14 constituted by a plurality of keys is exposed on the front surface of the upper housing 13A and a display 15 for displaying time information is provided on one side of the keypad 14. [ And a battery 17 for supplying power to the portable terminal 10 is provided on the rear surface of the lower housing 13B.

A microphone 16 is provided at the lower end of the portable upper housing 13A for voice communication and a speaker unit 20 is provided at the upper end for voice reception or sound output. However, the speaker unit 20 may be realized as a separate component from the receiver, in addition to a method that also serves as a receiver as shown in the figure.

2, the portable terminal 10 is a bar type having one body. However, the portable terminal 10 has two or more bodies, and may have other types such as a folder type or a slide type, The speaker unit 20 of the present invention can also be applied to a portable terminal.

3 is a cross-sectional view taken along the line I-I of the portable terminal of FIG. 3, a through hole 11 is formed in the front surface of the upper housing 13A, and the speaker unit 20 of the present invention is closely attached to the inside of the through hole 11. As shown in Fig.

The speaker unit 20 is supported by a chamber 22 surrounding a sound generating unit 23 for generating sound and provided at a rear of the sound generating unit 23 to provide a constant closed space 24.

The chamber 22 is formed by the upper housing 13A and the hermetic member 28 so that the first sound generated from the front surface of the sound emitting portion 23 and directed to the front through hole 11 does not leak into the portable terminal 10. [ As shown in Fig.

The sound generation unit 23 is a speaker in the form of a converter (for example, a combination of a magnet and a coil) for generating a vibration by electricity, a diaphragm for generating sound by being vibrated by a converter, And a piezoelectric type speaker in which a vibration plate is integrally formed.

The chamber 22 may be formed to have a size enough to replenish the air flowing in front of and behind the sound generating part in operation of the sound generating part 23. [ The front and rear width D of the chamber 22 is formed to be smaller than the width W of the chamber 22 and the width W of the chamber 22 is set to a length corresponding to the width of the portable terminal 10, It is possible to increase the volume of the portable terminal 10 and to enhance the bass sound performance secured by the increased length and to realize the slimness of the portable terminal 10 without affecting the space occupied by the other components.

4 is a cross-sectional view taken along line II-II of the portable terminal of FIG. 4, the closed space 24 of the chamber 22 is communicated with the draw tube 30 extending to the inside of the portable terminal 10 by a predetermined length L. As shown in FIG. The takeout tube 30 has an open end so that the second sound B generated at the rear of the sound generating unit 23 can be guided and released from the inside of the portable terminal 10. [

The draw tube 30 may be disposed between the display 15 and the edge of the upper housing 12 so as not to affect the components such as the display 15. Preferably, the take-out tube 30 is formed as a flexible type so that it can be bent or bent along a remaining space inside the portable terminal 10.

A protruding opening 25 communicating with the closed space 24 may be formed in the chamber 22 so that the outlet pipe 30 can be connected to the opening 25, So that it can be assembled. Therefore, the assembling of the take-out tube 30 can be simplified and the assembling time can be shortened.

The second sound B generated behind the sound generating section 23 has an opposite phase with respect to the first sound A generated in front of the sound producing section 23, The length L of the take-out tube 30 can be obtained by the following equation. However, its length L can be tuned by other factors.

Here, S is the open cross-sectional area (cm 2) of the take-out tube is 0.2 to 0.5 of the effective vibration radius of the sound generating portion 23. f _b is the tuning frequency in Hz, and V _b is the volume of the enclosed space in the chamber (ℓ).

According to Equation (1), as the sound to be tuned goes to the low frequency, f _b becomes small and L becomes long. That is, in order to improve the low sound, a sufficient length can be ensured from the rear surface of the sound generation part 23. [

Accordingly, the treble band of the sound generated and propagated from the rear side of the sound generation unit 23 is largely eliminated, while the low-frequency sound band with high diffraction efficiency is phase-shifted along the outflow tube 30 providing the air path So that the amount of bass reduction is reduced as a whole, and improvement of bass performance of the speaker unit 20 can be expected.

Data obtained by measuring the improvement effect of the low-frequency band according to the configuration of the present invention are shown in the following table. In this experiment, the volume of the closed space 24 of the chamber 22 is 0.4 cc, the length of the drawing tube 30 is about 1 cm, and the opening sectional area of the drawing tube is about 0.06 cm 2.

Tuning frequency (Hz) 300 500 700 Sound pressure level (dB) when there is no outlet pipe 34.7 47.2 54.8 Sound pressure level (dB) when there is a draft tube 38.8 53.0 59.7

According to Table 1, the sound pressure level is 4.1 dB, 5.8 dB, and 4.9 dB higher than that in the case of no outlet pipe 30 at 300 Hz, 500 Hz, and 700 Hz, respectively. The bass is not lost so much, but it is implemented largely.

5 is a cross-sectional view of a portable terminal having a plurality of drawing tubes according to a second embodiment of the present invention. 5, the chamber 122 is provided with a first opening 125 and a second opening 126 which are separated from each other to communicate with the closed space 124. The first opening 125 and the second opening 126 are connected to the first take-out tube 130 and the second take-out tube 140, respectively. The second sounds B and B 'are emitted through the first take-out tube 130 and the second take-out tube 140. In this case, the first take-out tube 130 and the second take-out tube 140 change the opening cross-sectional area S, and the frequency tuning can be performed accordingly.

Referring to FIG. 5, the first take-out pipe 130 is formed with bent portions 132 so that the first take-out pipe 130 can be disposed while avoiding other parts 133. In other words, it is possible to reduce design constraints of other parts by the take-out tubes 130 and 140, which require a certain length, so that the design implementation can be diversified. The description of other parts or members is the same as that of the first embodiment described above, and corresponding parts or members are given the same reference numerals, and a detailed description thereof will be omitted. The same applies to the description of the third embodiment and the fourth embodiment which will be described later.

6 is a cross-sectional view of a portable terminal having a draw-out tube capable of adjusting the length, according to a third embodiment of the present invention. Referring to FIG. 6, the take-out tube 230 is provided with a length adjuster 232 for adjusting the length L thereof. That is, the length of the take-out tube 232 can be directly adjusted to enable fine tuning.

The length adjusting part 232 is provided with a corrugation part 233 formed in a circumferential direction in a predetermined section of the take-out tube 230. Accordingly, the entire length L of the take-out tube 230 can be adjusted by squeezing or expanding the wrinkle portion 233 without greatly affecting the cross-sectional area of the take-out tube 230.

FIG. 7 is a perspective view of a portable terminal according to a fourth embodiment of the present invention, and FIG. 8 is a sectional view taken along line III-III of the portable terminal of FIG.

7, a second through hole 312 is formed in the front surface of the upper housing 213A at a position spaced apart from the first through hole 311 and the first through hole 311 .

8, a first chamber 322 in which a sound emitting portion 323 is mounted is provided on the inner side of the first through hole 311, and a second chamber 322 in which a sound emitting portion 323 is mounted is provided inside the second through hole 312, A chamber 350 is provided.

The first chamber 322 is connected to the first outlet pipe 330 and the second outlet pipe 340 and the first outlet pipe 330 is connected to the inside of the upper housing 313A and the lower housing 313B And the second take-out tube 340 forms an auxiliary chamber connected to the second chamber 350, so that the second sound B 'is directly emitted to the outside So that a more direct bass enhancement effect can be realized.

As described above, according to the speaker unit of the present invention, it is possible to improve the bass sound performance by reducing the influence of the interference between the first sound generated at the front face of the sound output unit and the second sound generated at the rear.

In one embodiment of the present invention, the length L of the take-out tube has a length capable of reversing the phase of the second sound, so that the bass performance can be further increased.

In addition, as an embodiment according to the present invention, the draw-out pipe is formed as a flexible type, thereby enhancing the mountability and space usability of the portable terminal and achieving slimming of the portable terminal.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Various modifications can be made by those skilled in the art within the scope.

Claims (15)

delete delete delete delete delete delete And a terminal housing having a through hole for guiding a sound to the outside in a front side, wherein a speaker unit is disposed inside the through hole, A pronunciation part; A chamber which supports the sound generation unit and emits a first sound generated from a front surface of the sound emission unit forward through the through hole and forms a closed space behind the sound emission unit; And And a take-out tube of a predetermined length (L) communicably connected with the closed space of the chamber and guiding a second sound generated from the rear surface of the sound emitting portion, The open end of the take-out tube is positioned in the inner space of the terminal housing and the second sound generated from the back face of the sound emitting portion is guided along the take-out tube and is discharged to the inner space of the terminal housing The mobile terminal being characterized by: delete 8. The method of claim 7, And a length (L) of the take-out tube is a length capable of reversing the phase of the second sound. 10. The method according to claim 7 or 9, Wherein the drawing tube is formed in a flexible type. 11. The method of claim 10, Wherein the chamber is formed with a protruding opening communicating with the closed space, and the draw-out pipe is inserted into the opening and inserted into the chamber. 8. The method of claim 7, The take-out tube further includes a length adjusting part for adjusting the length L, Wherein the length adjuster is formed by a wrinkle portion formed in a circumferential direction in a predetermined section of the take-out tube. 8. The method of claim 7, Wherein the chamber is formed to have a thickness smaller than the left and right width in the front-back direction, and a width of the chamber has a width corresponding to the width of the terminal housing. 8. The method of claim 7, And a plurality of draw-out pipes are formed on the chamber so as to be spaced apart from the chamber. 15. The method of claim 14, Further comprising an auxiliary through hole formed in the terminal housing at a position spaced apart from the through hole by a predetermined distance and an auxiliary chamber provided inside the auxiliary through hole, Wherein at least one of the drawing tubes is connected to the auxiliary chamber.

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