KR102669486B1 - Car speaker - Google Patents

Abstract

A vehicle speaker according to an embodiment of the present invention includes a first speaker responsible for outputting a low frequency band and a second speaker responsible for outputting a high frequency band, and the first speaker and the second speaker are positioned up and down on one side of the vibration panel. It can be installed in such a way that the space utilization of the vehicle speaker is improved.

Description

Car speaker{CAR SPEAKER}

The present invention relates to vehicle speakers.

Cars are equipped with sound devices such as audio systems or audio/video systems. These sound devices output sound sources recorded on media such as radio, CD disk, DVD disk, etc. as audible sound through speakers.

Car speakers contain magnets and voice coils. The coil is formed to surround the central axis of a diaphragm (e.g., cone paper), and when a current flows through the coil, a magnetic field is generated, thereby generating a magnetic force between the coil and the permanent magnet. Magnetic force occurs in the form of repeated attraction and repulsion, which causes the diaphragm to vibrate and thus produces sound.

These speakers are installed throughout the vehicle, occupying a large volume, and the magnets and voice coils increase the overall weight of the speaker. In addition, it requires a lot of power consumption.

Piezo electric effect element is a piezoelectric material that exhibits a piezoelectric effect. The piezoelectric effect is a phenomenon in which electrical polarization occurs on the surface of a crystal when force is applied to a solid. According to the piezoelectric effect, when pressure is applied to a piezoelectric material, a potential difference (voltage) is generated, and conversely, when a potential difference (voltage) is applied, a physical displacement occurs. Piezoelectric elements are widely used in resonators, filters, sensors, and actuators.

In order to overcome the shortcomings of conventional speakers, the inventor of the present invention completed the present invention after a long period of research and trial and error for a speaker using a piezoelectric element.

The purpose of the present invention is to provide a vehicle speaker that effectively transmits sound for various input frequencies.

Other unspecified objects of the present invention will be further considered within the scope that can be easily inferred from the following detailed description and its effects.

According to one aspect of the present invention, a first speaker installed on one side of the vibration panel; and a second speaker including a piezoelectric film attached to one surface of the vibration panel, wherein the first speaker includes a magnet; A voice coil surrounding the magnet; and a coupling ring that couples the voice coil and the vibration panel, wherein the piezoelectric film of the second speaker is located in a space provided between the coupling ring and the vibration panel. .

An edge of the coupling ring may be fixed to the vibration panel, and the space where the piezoelectric film is located may be provided inside the edge.

The second speaker may generate vibration at a higher frequency than the first speaker.

a signal line transmitting electrical signals to the first speaker and the second speaker; And it may further include an input frequency filter installed on the signal line so that the frequencies input to the first speaker and the second speaker are different.

It may further include a one-way filter installed on the signal line so that the electrical signal is transmitted in one direction.

The vibration panel may include a pillar member inside the vehicle, and the first speaker and the second speaker may be located inside the pillar member.

According to an embodiment of the present invention, sound can be vividly reproduced even when the input frequency is low frequency.

According to an embodiment of the present invention, space utilization of vehicle speakers can be maximized.

Meanwhile, it is to be added that even if the effects are not explicitly mentioned herein, the effects described in the following specification and their potential effects expected from the technical features of the present invention are treated as if described in the specification of the present invention.

Figure 1 is a diagram showing a vehicle speaker according to an embodiment of the present invention.
Figure 2 is a diagram showing a second speaker of a vehicle speaker according to an embodiment of the present invention.
3 and 4 are diagrams showing the output frequency of a vehicle speaker according to an embodiment of the present invention.
5 and 6 are diagrams showing a circuit diagram of a vehicle speaker according to an embodiment of the present invention.
Figure 7 is a diagram showing a state in which a vehicle speaker according to an embodiment of the present invention is mounted on a vehicle.
The attached drawings are intended as reference for understanding the technical idea of the present invention, and are not intended to limit the scope of the present invention.

In describing the present invention, if it is determined that related known functions may unnecessarily obscure the gist of the present invention as they are obvious to those skilled in the art, the detailed description thereof will be omitted.

The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, embodiments of a vehicle speaker according to the present invention will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, identical or corresponding components are assigned the same drawing numbers and overlapping descriptions thereof. will be omitted.

Figure 1 is a diagram showing a vehicle speaker 1000 according to an embodiment of the present invention.

Referring to FIG. 1, a vehicle speaker 1000 according to an embodiment of the invention includes a first speaker 100 and a second speaker 200. Both the first speaker 100 and the second speaker 200 can be installed on one side of the vibration panel 10, and the vibration generated from the first speaker 100 and the vibration generated from the second speaker 200 are all transmitted as sound through the vibration panel 10. Here, the vibration occurring in the first speaker 100 and the vibration occurring in the second speaker 200 may be transmitted independently to the vibration panel 10 and transmitted as independent sounds. Or, the influence they have on each other may be extremely minimal.

The vibrating panel 10 is a panel capable of vibrating when an external force is applied, and may be made of materials such as metal, polyvinylidene difluoride (PVDF), silicon, urethane, rubber, plastic, metal carbon nanotube, or graphene. It is not limited to this, and any material capable of vibration can be used. For example, the vibration panel 10 may be any flat part inside the vehicle.

The first speaker 100 may include a magnet 110, a voice coil 120, and a coupling ring 130.

The magnet 110 is a permanent magnet and may have a cylindrical shape.

The voice coil 120 is formed by winding a conductive wire multiple times, and the voice coil 120 may be formed to surround the outer peripheral surface of the magnet 110. That is, the magnet 110 may be located inside the voice coil 120. In this case, the voice coil 120 is located in the area where the magnetic field of the magnet 110 is applied, and when a current flows through the voice coil 120, the voice coil 120 vibrates up and down due to interaction with the magnet 110. You can. Meanwhile, here, the voice coil 120 may not be formed to surround the entire outer circumference of the magnet 110, but may be formed to surround a partial thickness of the outer circumference of the magnet 110.

The coupling ring 130 is a ring-shaped member that couples the voice coil 120 and the vibration panel 10. An opening may be provided in the center of the coupling ring 130. The coupling ring 130 may be provided with a circular insertion groove into which the voice coil 120 is inserted, and the insertion groove may be formed along the perimeter of the opening.

The edge 131 of the coupling ring 130 may be fixed to the vibration panel 10. The edge 131 of the coupling ring 130 may be fixed to one surface of the vibration panel 10. The edge 131 of the coupling ring 130 may be formed to have a diameter wider than that of the voice coil 120. The up and down vibration of the voice coil 120 can be transmitted to the vibration panel 10 by the coupling ring 130, through the vibration panel 10 and the edge 131 of the fixed coupling ring 130. 10). The coupling ring 130 may be made of a material that is sufficiently rigid to transmit the vibration of the voice coil 120 to the vibration panel 10.

Additionally, a space 132 in which the coupling ring 130 and the vibration panel 10 are spaced apart vertically may be provided inside the edge 131 of the coupling ring 130. That is, the magnet 110 and the voice coil 120 are spaced apart from the vibration panel 10 by the coupling ring 130. Accordingly, the edge 131 of the coupling ring 130 is fixed to the vibration panel 10, but the inside of the edge 131 floats from the vibration panel 10.

The coupling ring 130 may be provided with an air passage 133 connecting the space 132 and the outside. Specifically, an air passage 133 extending horizontally may be provided at the edge 131 of the coupling ring 130. However, unlike what is shown in FIG. 1, the air passage 133 may be provided perforated on the upper surface of the coupling ring 130 rather than on the edge 131 of the coupling ring 130. When the vibration panel 10 is vibrated by the second speaker 200, air may flow in and out through the air passage 133.

The first speaker 100 includes at least one of a flange 140, a yoke 150, a damper 160 (or a suspension, a pole piece 170). More may be included.

The flange 140 is coupled to the outer peripheral surface of the voice coil 120 and may be made of a conductive material to apply voltage to the voice coil 120.

The yoke 150 covers one surface of the magnet 110 and may be coupled to the flange 140. The yoke 150 covers the upper surface of the magnet 110, and one side (or upper surface) of the magnet 110 is the side of the two sides of the magnet 110 that does not face the vibration panel 10.

The flange 140 and/or yoke 150 may be coupled to an external housing (not shown) to fix the position. Additionally, the position of the magnet 110 may also be fixed accordingly.

The damper 160 may limit the vertical movement of the voice coil 120, may be coupled to the outer peripheral surface of the voice coil 120, and may be coupled to the flange 140. Damper 160 may be formed of an elastic member.

The pole piece 170 may be coupled to the other side of the magnet 110, and in particular, may be coupled to the side facing the vibration panel 10. The pole piece 170 may be polarized according to the pole of the magnet 110. The pole piece 170 may be made of a magnetic material.

The above-described first speaker 100 may be a dynamic speaker using the vibration panel 10 as a diaphragm, or a surface speaker (surface-mounted speaker, vibration speaker, surface transducer).

The second speaker 200 may include a piezoelectric film 210 attached to one surface of the vibration panel 10. That is, the piezoelectric film 210 is attached to one surface of the vibrating panel 10, and the vibrating panel 10 can vibrate due to the piezoelectric effect according to the application of voltage to the piezoelectric film 210. That is, as voltage is applied, the piezoelectric film 210 is bent while repeatedly forming smiling and crying patterns, and accordingly, the vibrating panel 10 can also vibrate in the same shape.

The piezoelectric film 210 of the second speaker 200 may be attached to one surface of the vibration panel 10 so as to be located in the space 132 provided between the coupling ring 130 and the vibration panel 10. The piezoelectric film 210 may be adhered to one surface of the vibration panel 10 by an adhesive, and the adhesive may be made of a soft material.

Specifically, the edge 131 of the coupling ring 130 is fixed to one surface of the vibration panel 10, and the coupling ring 130 and the vibration panel 10 are spaced apart from each other inside the edge 131 of the coupling ring 130. A space 132 is provided, and the piezoelectric film 210 can be located in the space 132.

Accordingly, the first speaker 100 and the second speaker 200 are arranged perpendicular to the vibration panel 10 and may be arranged in parallel. In this case, the space 132 occupied by the vehicle speaker 1000 of the present invention, which is a combination of the first speaker 100 and the second speaker 200, can be minimized.

The length of the piezoelectric film 210 may be larger than the diameter of the voice coil 120, but is not limited. The piezoelectric film 210 is not in contact with the coupling ring 130, and the piezoelectric film 210 may be bent within the space 132 between the coupling ring 130 and the vibration panel 10.

The piezoelectric film 210 and the coupling ring 130 are spaced apart from each other in the left and right directions. The piezoelectric film 210 is placed at a point 11 of the vibrating panel where the piezoelectric film 210 and the coupling ring 130 are spaced apart from each other in the left and right directions. A groove (not shown) may be formed along the circumference of . The groove may penetrate a portion of the thickness of the vibration panel 10.

Accordingly, the influence of the vibration caused by the first speaker 100 and the vibration caused by the second speaker 200 on each other in the vibration panel 10 can be minimized.

Figure 2 is a diagram showing the second speaker 200 of the vehicle speaker 1000 according to an embodiment of the present invention.

2(a) shows a piezoelectric film 210, and a lead terminal 20 is coupled to the piezoelectric film 210. The lead terminal 20 may be electrically connected to the electrode layer 230 of the piezoelectric film 210.

Referring to FIG. 2(b), the piezoelectric film 210 may form a layered piezoelectric ceramic structure. In this case, the piezoelectric film 210 may include a piezoelectric layer 220 and an electrode layer 230, and the piezoelectric layer 220 and the electrode layer 230 may be alternately stacked. Each of the piezoelectric layers 220 and the electrode layers 230 may be formed in plural numbers, and the plurality of piezoelectric layers 220 and the plurality of electrode layers 230 may be alternately stacked.

The piezoelectric layer 220 is made of not only polycrystalline ceramics such as PZT, but also single crystal piezoelectric materials such as PMN-PT, PZN-PT, PIN-PT, and PYN-PT, flexible piezoelectric polymer materials such as PVDF and PVDF-TrFE, and BNT (BaNiTiO ₃ ), lead-free new piezoelectric materials such as BZT-BCT, etc. The piezoelectric layer 220 may have a thickness of about 10 to 60 ㎛, and may have various shapes such as not only square, but also circular, oval, and polygonal.

The electrode layer 230 may be formed on at least one surface of the piezoelectric layer 220. The electrode layer 230 may include a positive electrode and a negative electrode. Positive and negative electrodes may be located on both sides of one piezoelectric layer 220, respectively. Positive electrodes located on different layers may be electrically connected through vias. Negative electrodes located in different layers can also be electrically connected through vias, and the positive and negative electrodes are independent from each other.

Meanwhile, the piezoelectric film 210 may include at least one cover layer 240, and the cover layer 240 may be made of an insulating material.

Meanwhile, the piezoelectric film 210 used in the vehicle speaker 1000 of the present invention is not limited to the structure shown in FIG. 2, and any material that exhibits a piezoelectric effect to vibrate the vibration panel 10 can be used. .

The first speaker 100 and the second speaker 200 may generate vibrations of different frequencies. That is, the vibration frequency of the voice coil 120 of the first speaker 100 and the vibration frequency of the piezoelectric film 210 of the second speaker 200 may be different from each other. Specifically, the second speaker 200 may generate vibration at a higher frequency than the first speaker 100. For example, the first speaker 100 may generate vibration with a frequency of 500 Hz or less, and the second speaker 200 may generate vibration with a frequency greater than 500 Hz. This vehicle speaker 1000 may be implemented as a 2-way speaker.

In this case, the vibration caused by the second speaker 200 is implemented as a relatively high sound in the vibration panel 10, and the vibration caused by the first speaker 100 is implemented as a relatively low sound in the vibration panel 10. You can. Accordingly, sounds in a low pitch range are transmitted through the portion of the vibration panel 10 coupled to the first speaker 100, and sounds in a high pitch range are transmitted through the portion of the vibration panel 10 coupled to the second speaker 200. It can be transmitted.

3 and 4 are diagrams showing the output frequency of the vehicle speaker 1000 according to an embodiment of the present invention. In particular, it indicates the sound level (dB) for the output frequency according to the input frequency.

Figure 3(a) shows the output frequency according to the vibration of the first speaker 100, and Figure 3(b) shows the output frequency according to the vibration of the second speaker 200. As shown in FIG. 3, the first speaker 100 can output a relatively low frequency band, and the second speaker 200 can output a relatively high frequency band.

Accordingly, as shown in FIG. 4, starting from a specific frequency, the first speaker 100 is responsible for low-frequency output (A), and the second speaker 200 is responsible for high-frequency output (B).

Ultimately, the first speaker 100 can transmit low sounds, and the second speaker 200 can transmit high sounds. The first speaker 100 may function as a woofer, and the second speaker 200 may function as a tweeter.

Meanwhile, the specific frequency that serves as the starting point may be 500 Hz, and preferably 300 Hz. However, it is not limited to this number.

5 and 6 are diagrams showing a circuit diagram of a vehicle speaker 1000 according to an embodiment of the present invention.

The vehicle speaker 1000 according to an embodiment of the present invention includes a circuit, and the circuit can process an input electrical signal and transmit it to the first speaker 100 and the second speaker 200.

The circuit may include a signal line and an input frequency filter. These circuits can be implemented on a printed circuit board (PCB).

The signal line can transmit electrical signals to the first speaker 100 and the second speaker 200. Signal lines can be implemented as a pair for each speaker and connected to the anode and cathode. Additionally, the signal line connected to the first speaker 100 and the signal line connected to the second speaker 200 may be formed independently of each other.

The input frequency filter can adjust the frequency of the electrical signal transmitted to each speaker, and the input frequency filter can be implemented with electronic components installed on the signal line.

Referring to FIG. 5, signal lines connected to the first speaker 100 and the second speaker 200 are shown. A signal line connected to the anode and a signal line connected to the cathode are respectively connected to the first speaker 100. A signal line connected to the anode and a signal line connected to the cathode are connected to the second speaker 200, respectively.

Electrical signals input to the first speaker 100 and the second speaker 200 are input from the anode. Here, a low frequency band is input to the first speaker 100, and a high frequency band is input to the second speaker 200. The electrical signal input to the anode includes both low and high frequency bands, but the frequency input to the first speaker 100 and the frequency input to the second speaker 200 may be different.

For this purpose, an input frequency filter is installed on the signal line. The input frequency filter may include a series filter and a parallel filter. First, let's look at the series filter.

A coil connected in series with the first speaker 100 is provided on the signal line connected to the first speaker 100, and the coil can filter high frequencies and easily pass low frequencies. In addition, a capacitor connected in series with the second speaker 200 is provided on the signal line connected to the second speaker 200, and the capacitor can filter low frequencies and easily pass high frequencies.

Furthermore, in order to minimize the crossover frequency region, a parallel filter may be installed. The signal line connected to the first speaker 100 may further include a capacitor connected in parallel with the first speaker 100, and thus high frequencies may be forcibly lost. Additionally, the signal line connected to the second speaker 200 may further include a coil connected in parallel with the second speaker 200, and as a result, low frequencies may be forcibly lost. Accordingly, the attenuation rate of the output frequency can be increased and the crossover area can be reduced.

Meanwhile, referring to FIG. 6(a), a one-way filter (F) may be installed on the signal line, and the one-way filter (F) may be implemented with electronic components. For example, the one-way filter (F) may include a diode. As shown in FIG. 6(b), the one-way filter F may include a Zener diode. The Zener diode can be connected to ground and installed on the signal line.

The one-way filter (F) may be installed on at least one of the signal line connected to the first speaker 100 and the signal line connected to the second speaker 200. Additionally, a one-way filter (F) may be installed on each of the signal lines connected to the anode and the signal line connected to the cathode.

In the signal line connected to the anode, the one-way filter (F) can be installed closer to the speaker than the input frequency filter. In this case, the electrical signal input to the input terminal (anode) is first passed through the serial input frequency filter. After passing through the one-way filter (F), it is input to the speaker. Additionally, the electrical signal output from the speaker may be output to the output terminal (cathode) after passing through the one-way filter (F).

According to the one-way filter (F), electrical signals can only flow in one direction. In particular, the one-way filter (F) can allow electrical signals to flow in only one direction under certain conditions. Therefore, the input electrical signal is transmitted to the first speaker 100 and the second speaker 200, and the electrical signal caused by unnecessary vibration or shock generated from the first speaker 100 and/or the second speaker 200 may not be transmitted in the reverse direction.

Figure 7 is a diagram showing a state in which the vehicle speaker 1000 according to an embodiment of the present invention is mounted on a vehicle.

Referring to FIG. 7, the vehicle speaker 1000 according to an embodiment of the present invention may be installed inside a vehicle, and in particular, may be installed on a pillar member P inside the vehicle. In this case, the above-described vibration panel 10 becomes a pillar member (P).

The first speaker 100 and the second speaker 200 may be located inside the pillar member (P). In this case, the first speaker 100 and the second speaker 200 are not visible inside the vehicle.

The pillar member (P) may be an A-pillar of a vehicle, but is not limited thereto.

Meanwhile, the vehicle speaker 1000 according to an embodiment of the present invention may be installed in addition to the pillar member P, as shown in FIG. 7.

The scope of protection of the present invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the scope of protection of the present invention may not be limited due to changes or substitutions that are obvious in the technical field to which the present invention pertains.

10: Vibration panel
100: 1st speaker
110: Magnet
120: voice coil
130: coupling ring
140: Flange
150: York
160: damper
170: Pole Piece
200: second speaker
210: Piezoelectric film
220: Piezoelectric layer
230: electrode layer
240: Cover layer

Claims (6)

A first speaker installed on one side of the vibration panel; and
It includes a second speaker including a piezoelectric film attached to one surface of the vibration panel,
The first speaker is,
magnet;
A voice coil surrounding the magnet; and
It includes a coupling ring that couples the voice coil and the vibration panel,
The edge of the coupling ring is fixed to the vibration panel,
The piezoelectric film of the second speaker is located in a space provided inside the edge between the coupling ring and the vibration panel,
An air passage connecting the space and the outside of the coupling ring is formed in the coupling ring,
a signal line transmitting electrical signals to the first speaker and the second speaker; and
Further comprising an input frequency filter installed on the signal line so that the frequencies input to the first speaker and the second speaker are different,
Car speakers.
delete According to paragraph 1,
The second speaker generates vibration of a higher frequency than the first speaker,
Car speakers.
delete According to paragraph 1,
Further comprising a one-way filter installed on the signal line so that the electrical signal is transmitted in one direction,
Car speakers.
According to paragraph 1,
The vibration panel includes a pillar member inside the vehicle,
The first speaker and the second speaker are located inside the pillar member,
Car speakers.

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