KR20160111097A

KR20160111097A - Speaker

Info

Publication number: KR20160111097A
Application number: KR1020150035801A
Authority: KR
Inventors: 박병은
Original assignee: 서울시립대학교 산학협력단
Priority date: 2015-03-16
Filing date: 2015-03-16
Publication date: 2016-09-26

Abstract

The present invention relates to a speaker capable of increasing an output volume. The speaker according to the present invention is characterized in that it has a body which is hollow and has one side open and the other side is closed and constitutes a reflecting surface for reflecting a voice signal, A sound output member provided inside the holder and provided with a sound signal output side facing the reflecting surface and a sound output member provided at a sound signal output side of the sound output member and spaced apart from the sound output member by a certain distance And the resonance member is provided with a plurality of through holes.

Description

Speaker {Speaker}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker, and more particularly, to a speaker capable of improving output volume and output sound.

In recent years, as information and communication devices have become thinner and thinner, the size of speakers used in these information devices has also been rapidly increasing. Thin-film loudspeakers or flat-panel loudspeakers have attracted attention as being most suitable for miniaturization of loudspeakers.

2. Description of the Related Art Generally, a flat speaker uses a piezoelectric element composed of, for example, piezoelectric ceramics to vibrate a diaphragm or a vibration panel so that an electric signal is changed into physical sound energy. Such thin film loudspeakers are disclosed in patent applications 10-2001-0015695, 10-2001-0033419, 10-2001-0078293, 10-0533714, 10-1367453, and 20-0350350.

Generally speaking, the vibration of the vibration panel generates sound energy by vibrating the surrounding medium, that is, air. Therefore, in order to increase the output volume of the speaker, it is required to increase the vertical vibration displacement amount of the vibration panel. However, there is a disadvantage in that it is difficult to improve the output volume of the thin film speaker using the piezoelectric element or the like employed in the thin film speaker because there is a certain limit to increase the amount of vibration displacement caused by the electrical signal.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a speaker device capable of improving output volume and output sound while employing a flat speaker.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a loudspeaker comprising: a body that is hollow and has one side opened and the other side thereof sealed to form a reflective surface for reflecting a voice signal; A sound output member provided on the inner side of the holder and provided with a sound signal output side facing the reflection surface and a sound output member provided on the sound signal output side of the sound output member, And a resonance member installed at a predetermined distance from the sound output member, wherein the resonance member is provided with a plurality of through holes.

Further, the reflecting surface is formed in a hemispherical shape.

And at least one of the through holes is different in length from the other through holes.

And at least one of the through-holes is set to be different from the through-hole having a different diameter.

The sound output member includes a frame, a vibration panel coupled to the upper side of the frame, and a piezoelectric element coupled to a lower surface of the vibration panel, wherein at least one groove is provided on the upper surface of the vibration panel .

And the groove is hemispherical.

Wherein at least two grooves are provided and the size of at least one groove is set different from the other grooves.

Wherein at least two of the grooves are provided, and at least one of the grooves is formed differently from the other grooves.

Wherein the voice output member includes a frame and a vibration panel coupled to the upper side of the frame, wherein the vibration panel includes a ferroelectric layer formed of a ferroelectric material, first and second electrodes formed on the upper and lower sides of the ferroelectric layer, A second electrode layer, and an electrode electrically coupled to the first and second electrode layers, respectively.

And the ferroelectric material is PVDF.

And the PVDF is a? Phase PVDF.

And a metal is further mixed in the ferroelectric layer.

The ferroelectric layer is characterized in that the central portion and the side portion are set to have different thicknesses from each other.

A speaker according to a second aspect of the present invention includes a sound output member, a first resonance member for resonating a sound signal output from the sound output member, and a second resonance member for resonating the sound signal generated by the first resonance member with a second resonance And the first resonance member constitutes a Helmholtz resonator.

The second resonance member may include a reflection surface for reflecting a voice signal and an inner space provided inside the reflection surface.

According to the present invention configured as described above, the voice signal output from the flat speaker is output to the outside through the first and second resonators. The first resonator is composed of a Helmholtz resonator, and outputs a resonant voice signal resonated by the first resonator for each frequency band. Therefore, it is possible to improve the output sound and the volume output from the flat speaker, and to set the output sound and the volume thereof variously.

1 is a sectional view showing a sectional shape of a speaker according to a first embodiment of the present invention.
2 is a plan view of the speaker shown in Fig.
3 is a sectional view showing a first configuration example of a sound output member applied to the present invention.
4 is a sectional view showing a second configuration example of a sound output member applied to the present invention.
5 is a cross-sectional view showing the structure of the vibration panel 60 in FIG.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. However, the embodiments described below represent one preferred embodiment of the present invention, and examples of such embodiments are not intended to limit the scope of the present invention.

1 is a cross-sectional view of a speaker according to a first embodiment of the present invention, and Fig. 2 is a plan view thereof.

In the figure, the speaker has a cylindrical body (10). The body 10 is provided with a hemispherical reflecting surface 11 for one side to be opened and the other side to be hermetically sealed and for reflecting voice signals on the inner side thereof. The lower internal space of the reflection surface 11 and the body 10 constitute a resonator for a voice signal.

A flange (12) is provided at one end of the body (10). The flange 12 is for coupling a speaker to an audio device or the like, and a fastening hole 121 is provided.

An audio output member (30) is installed at an inner central portion of the body (10) with a certain distance from the reflection surface (11). The audio output member (30) is installed so as to be seated inside the holder (40). And the holder 40 is coupled to the inner surface of the body 10 through the fastening bar 50,

As the sound output member 30, a thin-film speaker or a flat speaker is employed. Also, although not specifically shown in the drawing, the sound output member 30 is electrically coupled to an external device through a signal line. The signal line is electrically connected to the sound output member 30 after being introduced from the outside through a through hole (not shown) provided in the side wall of the body 10, for example.

A resonance member 50 is provided inside the holder 40 at a distance from the sound output member 30 corresponding to the sound output side of the sound output member 30. [ The resonance member (50) is constituted by a plurality of through holes (51). The through hole 51 constitutes a resonator. The through holes 51 constitute a Helmholtz resonator, respectively. In the present embodiment, the through-holes 51 are set so as to become shorter from the central portion toward the outer portion. The Helmholtz resonator varies in resonant frequency depending on its length. That is, as the length becomes longer, the resonance frequency shifts to the low frequency range. The resonance member (51) can output various resonance sounds by setting the length of the through hole (51) to a plurality of types. The shape of the resonance member (50) is not limited to a specific one. For example, the through-holes 51 may be configured to have a longer length from the central portion to the outer portion, and the through-holes 51 may have different lengths from each other.

3 is a cross-sectional view showing a configuration example of the sound output member 30.

In this example, the sound output member 30 includes a frame 31 and a vibration panel 32 coupled to the upper side of the frame 31. A piezoelectric element 33 is disposed below the vibration panel 32 . In particular, at least one groove 321 is provided on the upper surface of the vibration panel 32.

The shape of the groove 321 is not limited to a specific one. Preferably, a plurality of the grooves 321 are provided, and the grooves 321 may have different sizes and shapes.

When an electrical voice signal is applied to the piezoelectric element 33 in the above configuration, the piezoelectric element 33 vibrates in accordance with the voice signal, causing the vibration panel 32 to vibrate up and down. Then, the vibration energy causes the air surrounding the vibration panel 32 to vibrate, and the vibration of the air is radiated as sound energy.

In particular, a plurality of grooves 321 are formed on the upper surface of the vibration panel 32. This groove 321 enlarges the contact area between the vibration panel 32 and the medium and air. Accordingly, the vibration energy of the vibration panel 32 more effectively causes the air to vibrate.

4 is a cross-sectional view showing another example of the structure of the sound output member 30, and Fig. 5 is a sectional view showing the structure of the vibration panel 60 in Fig.

In this example, the sound output member has a frame 31 and a vibration panel 60 which is coupled to the upper side of the frame 31. 5, the vibration panel 60 includes a ferroelectric layer 61 formed of a ferroelectric film, first and second conductive layers 62 coupled to the upper and lower sides of the ferroelectric layer 61, And an electrode 63 coupled to the second conductive layer 62.

The ferroelectric precursor layer 61 is preferably made of PVDF, more preferably a PVDF having a beta phase. More preferably, the ferroelectric layer 61 is mixed with a metal material such as iron (Fe). At this time, the mixing ratio of the metal material is set to about 2% by weight or less.

The above-mentioned? -Phase PVDF film is formed by a conventional method of forming a PVDF film and rapidly cooling the PVDF film at a temperature at which the? -Phase is exhibited, for example, at 65 degrees.

Generally, in a sound output member constituting a thin-film speaker or a flat-plate speaker, the thickness of the ferroelectric layer is made generally flat. However, in this example, the thickness of the central portion of the ferroelectric layer 61 is set to be larger than both sides. Therefore, when the ferroelectric layer vibrates due to an external electrical signal, the center of gravity of the vibration plate 60 is positioned at the central portion of the sound output member of the present embodiment. This phenomenon provides an effect of increasing the output volume of the sound output member.

In this example, the contact area between the vibration panel 60 and the air is increased, so that the vibration energy of the vibration panel 60 is effectively transmitted to the medium, that is, the air layer. This also provides an effect of increasing the volume of the sound output member.

In the present invention, the through-hole 51 of the resonance member 20 constitutes the first resonator, and the reflection surface 11 provided at the lower portion of the body 10 and the inner space thereof constitute the second resonator. When the voice signal S is output from the voice output member 30, the voice signal S is primarily resonated and amplified while passing through the through hole 51 of the resonance member 50. The voice signal S outputted through the resonance member 50 is synthesized and resonated by the reflection surface 11 and its inner space, and is output to the outside. In particular, the speech signal S is resonated and amplified per frequency band of interest in the first resonator, that is, the Helmholtz resonator. At this time, it is possible to adjust the acoustic characteristics of the entire speaker through the method of adjusting the length of the through-hole 51 constituting the second resonator and the number of through-holes having a specific length.

According to the present invention configured as described above, the voice signal output from the voice output member 30 is amplified through the first and second resonators and output to the outside. Accordingly, it is possible to improve the overall acoustic and loudness characteristics of the speaker device.

The embodiments according to the present invention have been described above. The present invention may, however, be embodied with various changes and modifications without departing from the spirit thereof. For example, although the diameter of the through hole 51 provided in the resonance member 50 is shown to be the same, the diameter of the through hole 51 according to the resonance frequency to be implemented using the through hole 51 The diameter can be set in various ways.

10: torso, 11: reflective surface,
12: flange, 30: sound output member,
50: Resonance member, 51: Through hole.

Claims

The body being hollow and having one side opened and the other side being closed to form a reflecting surface for reflecting a voice signal,
A holder provided at a predetermined distance from the reflecting surface and provided at an inner central portion of the body,
An audio output member provided inside the holder and provided with a sound signal output side facing the reflection surface,
And a resonance member which is provided on the audio signal output side of the audio output member and is spaced apart from the audio output member by a predetermined distance,
Wherein the resonance member comprises a plurality of through holes.

The method according to claim 1,
Wherein the reflective surface is semi-spherical.

The method according to claim 1,
Wherein at least one of the through-holes is set differently from the other through-holes.

The method according to claim 1,
Wherein at least one of the through holes is set to be different from the through hole having a different diameter.

The method according to claim 1,
The sound output member includes a frame, a vibration panel coupled to the upper side of the frame, and a piezoelectric element coupled to a lower surface of the vibration panel, wherein at least one groove is provided on the upper surface of the vibration panel Speakers.

6. The method of claim 5,
Wherein the groove has a hemispherical shape.

6. The method of claim 5,
Wherein at least two grooves are provided,
Wherein at least one of the grooves has a size different from that of the other grooves.

6. The method of claim 5,
Wherein at least two grooves are provided,
Wherein the shape of the at least one groove is set different from the shape of the other groove.

The method according to claim 1,
Wherein the voice output member includes a frame and a vibration panel coupled to the upper side of the frame, wherein the vibration panel includes a ferroelectric layer formed of a ferroelectric material, first and second electrodes formed on the upper and lower sides of the ferroelectric layer, A second electrode layer, and an electrode electrically coupled to the first and second electrode layers, respectively.

10. The method of claim 9,
Wherein the ferroelectric material is PVDF.

11. The method of claim 10,
Wherein the PVDF is a? Phase PVDF.

The method according to claim 10 or 11,
And a metal is further mixed in the ferroelectric layer.

10. The method of claim 9,
Wherein the ferroelectric layer has a central portion and a side portion different in thickness from each other.

An audio output member,
A first resonance member for first resonating the voice signal outputted from the voice output member,
And a second resonance member for secondarily resonating the voice signal generated by the first resonance member,
Wherein the first resonance member comprises a Helm's heel resonator.

15. The method of claim 14,
Wherein the second resonance member includes a reflective surface for reflecting a voice signal and an inner space provided inside the reflective surface.