JP2004343453A - Audio apparatus for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multichannel on-vehicle audio apparatus without attaching a conventional dynamic speaker to the inside of a door. <P>SOLUTION: A diaphragms 21 in which a coil 35 is arranged, is attached to a windshield glass 11, side window glass 12-15, rear window glass 16 or the like in an automobile, and an attachment plate 30, in which a magnet 31 is arranged, is fixed to the diaphragm 21 to be opposed to the coil 35 to make an audio current flow through the coil 35 of the diaphragm 21. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle audio device, and more particularly to a vehicle audio device that reproduces sound by vibrating a window glass of the vehicle.
[0002]
[Prior art]
2. Description of the Related Art In order to enjoy music while driving, an in-vehicle audio device is conventionally mounted on an instrument panel of a vehicle. That is, a tuner, a tape player, a disc player, and the like are provided at substantially the left and right central portions of the instrument panel, and the audio signals reproduced by these audio sources are reproduced by speakers mounted at predetermined positions in the vehicle interior. ing. Therefore, for example, it is possible to read out audio signals written on a CD (compact disk) or DVD by a disk player and reproduce the music by speakers to enjoy music.
[0003]
Japanese Patent Application Laid-Open No. 62-73898 discloses that a diaphragm made of a transparent body is connected to a voice coil inserted into a magnetic gap of a magnetic circuit, and this diaphragm is curved by a frame through an edge. A speaker that is held and mounted on, for example, a window of an automobile is disclosed.
[0004]
In Japanese Patent Application Laid-Open No. 2001-37000, the boarding position confirmation unit detects the presence or absence of a person for each seat by means of front left, front right, rear left and rear right switches, etc., and distributes the number of passengers. Along with recognizing the layout, the control unit controls the electronic volume according to the layout of the occupants recognized by the boarding position recognition unit, and outputs the acoustic signals output by the speakers of the channels FL, FR, RL, and RR of the speaker group. By adjusting the volume of the vehicle, the simple configuration enables the system to recognize the number of passengers and adjust the sound field distribution such as multi-channel surround automatically. A vehicular audio apparatus is disclosed which always reliably and appropriately forms a sound field that is appropriately adjusted.
[0005]
[Patent Document 1] Japanese Patent Application Laid-Open No. 62-73898 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-37000 [Problems to be Solved by the Invention]
In place of the conventional left and right two-channel car audio system, there is a tendency to use audio devices using speakers of three or more channels. This is due to the development of disc players using discs such as DVDs and SACDs (Super Audio CDs), and ICs for audio processing such as DPS for processing audio signals reproduced by such disc players.
[0006]
However, in the case of an in-vehicle audio device, two to four general dynamic speakers comprising a magnet and a cone-shaped diaphragm are mounted inside the trim of a vehicle door or the like, thereby reproducing left and right two-channel stereo audio signals. Was. However, with the advent of DVDs and SACDs as described above, it has become necessary to reproduce 5.1-channel and 6-channel multi-channel sound sources. That is, in reproducing these multi-channel sound sources, six speakers are required. However, when a general dynamic speaker is mounted in a vehicle cabin, a place and a space where the mounting can be performed are limited, and a case where the mounting cannot be performed and a mounting position are limited.
[0007]
There are also systems that require speakers exceeding six channels when reproducing sound sources such as movies from DVDs. Therefore, there is a tendency that more speakers are required even in the cabin of an automobile. However, there is a limit to increasing the number of conventional dynamic speakers due to the mounting position and space issues.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and has been made in view of the above circumstances, and has a vehicle audio apparatus capable of reproducing a multi-channel sound source without adding a conventional dynamic speaker in a vehicle cabin. The purpose is to provide.
[0009]
[Means for Solving the Problems]
The main invention of the present application is
The present invention relates to an audio device for a vehicle, wherein a diaphragm is joined to a window glass of a vehicle, and a sound is reproduced by vibrating a window glass by the diaphragm according to an audio signal. Note that a window glass refers to a transparent, translucent, or opaque panel that closes an opening of a window, and is not necessarily limited to a panel made of an inorganic glass material.
[0010]
Here, it is preferable that the diaphragm has a coil formed of a conductor, the coil is arranged to face the magnet, and the diaphragm is vibrated by passing an audio current through the conductor. Preferably, the diaphragm has a plurality of coils, and a magnet is fixedly arranged to face each of the coils. Preferably, the magnet is mounted on a mounting plate, and the mounting plate is fixed to the window glass in the vicinity of an outer peripheral edge of the diaphragm via a support means. Preferably, the magnet is mounted on a mounting plate, and the mounting plate is fixed to a member other than the window glass via support means. Further, it is preferable that the vibration plate is a vibration plate to which a piezoelectric ceramic is joined, and that the vibration is generated by expansion and contraction of the piezoelectric ceramic in a surface direction. Preferably, the diaphragm is made of a piezoelectric polymer material, electrodes are provided on both sides, and an audio signal is applied to the electrodes.
[0011]
Another main invention of the present application is
A diaphragm is bonded to each of a plurality of window glasses of a vehicle, and audio signals of at least two or more types of channels are separately supplied to the plurality of window glass diaphragms, and the corresponding window glass is vibrated so that two or more channels are vibrated. The present invention relates to an audio device for a vehicle, which reproduces the sound of a vehicle.
[0012]
Here, it is preferable that a diaphragm is bonded to each of a windshield and a side window glass of the vehicle, and audio signals of different channels are supplied to the diaphragm of the windshield and the diaphragm of the side window glass. Further, it is preferable that a pair of left and right diaphragms are joined to the windshield of the vehicle at a distance from each other, and audio signals of left and right channels are supplied to the left and right diaphragms. Further, it is preferable that the diaphragms are respectively bonded to the left and right side window glasses of the vehicle, and the left and right channel audio signals are separately supplied to the left and right side window glass diaphragms. Preferably, a diaphragm is joined to a rear window glass of the vehicle, and the rear window glass is vibrated to reproduce sound of a rear channel or a surround channel.
[0013]
According to a preferred aspect of the present invention, a multi-channel speaker is provided in which a window for transmitting an audio signal is attached to a front window, a door window, a rear window, a roof window, or the like in a vehicle cabin. The present invention relates to an in-vehicle audio device for which a system is constructed.
[0014]
According to such an embodiment, it is possible to reproduce a multi-channel sound source without increasing the number of conventional dynamic speakers in accordance with the number of channels, and to provide a multi-channel in-vehicle audio device such as a DVD or SACD. Can be constructed without a conventional speaker.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the invention included in the present application will be described with reference to the illustrated embodiments. 1 and 2 show the appearance of an automobile equipped with a vehicle audio apparatus according to the present embodiment. Here, a windshield 11, left and right side window glasses 12, 13 and left and right rear side window glasses are shown. Diaphragms 21, 22, 23, 24 are attached to 14, 15, and rear window glass 16, respectively. Then, sound is reproduced by vibrating the windshield 11, the side window glasses 12 to 15, and the rear window glass 16 by these diaphragms 21 to 24, thereby constructing a vehicle audio apparatus.
[0016]
The specific configuration of driving the window glasses 11 to 16 by the vibration plates 21 to 24 will be described with reference to FIGS. For example, a horizontally long vibration plate 21 is attached to the lower surface of the inner surface of the windshield 11, that is, a region where the visibility of the windshield 11 is not impaired.
[0017]
As shown in FIG. 4A, the diaphragm 21 is joined to the inner surface of the windshield 11 via a transparent adhesive, for example. The mounting plate 30 is arranged so as to face the diaphragm 21 with a predetermined gap. The mounting plate 30 has magnets 31 arranged on its surface, and these magnets 31 are opposed to the vibration plate 21 via a gap.
[0018]
The mounting plate 30 has a corner portion mounted on a support 32 having a suction cup at the tip, for example, on the inner surface of the windshield 11 and outside the outer peripheral edge of the diaphragm 21. The mounting structure of the mounting plate 30 may be fixed on a dash panel above the instrument panel of the vehicle via a bracket 33 as shown in FIG.
[0019]
FIG. 5 particularly shows the structure of the diaphragm 21, in which coils 35 are arranged in a matrix in the diaphragm 21. The coil 35 may be a coil formed in a spiral or helical shape by a conductor pattern. Then, magnets 31 are arranged in a matrix on the mounting plate 30 so as to face such coils 35 as shown in FIG. That is, the coil 35 shown in FIG. 5 and the magnet 31 shown in FIG. 6 correspond one to one.
[0020]
FIG. 7 shows the principle of generation of vibration by such a coil 35 and the magnet 31. An audio current is supplied to the coil 35, thereby forming an electromagnet. Therefore, the strength of the electromagnet formed by the coil 35 changes or the polarity is reversed according to the direction in which the audio current flows. Therefore, an attractive force and a repulsive force are generated between the coil 35 and the magnet 31 in accordance with such a change in the audio signal. Therefore, if the magnet 31 is fixed via the mounting plate 30, the diaphragm 21 including the coil 35 vibrates in a direction approaching and away from the magnet 31. Therefore, the windshield 11 to which such a diaphragm 21 is attached, particularly the vicinity of the attachment portion of the diaphragm 21 locally vibrates according to the audio signal, thereby reproducing the audio. That is, the windshield 11 does not vibrate on its entire surface but reproduces sound by vibrating locally.
[0021]
FIG. 8 shows an example in which a 5-channel audio device is constituted by a windshield 11 and side window glasses 12 to 15. The audio source is composed of a disc player 40, which reproduces a DVD 41. A reproduction signal from the disc player 40 is supplied to a DSP (Digital Signal Processor) 42, and further supplied from the DSP 42 to an amplifier 44 through a corresponding D / A converter 47 and electronic volume 43, and each amplifier drives a corresponding coil 35. I do. Therefore, the vibration plates 21 to 23 having the coil 35 generate vibrations. Here, the CPU 46 connected to the operation input unit 45 controls the DPS 42 and the electronic volume 43.
[0022]
This configuration shows an example in which a five-channel audio device is configured by a diaphragm 21 of a windshield 11, a diaphragm 22 of side window glasses 12, 13 and a diaphragm 23 of side window glasses 14, 15 on the rear side. However, by arbitrarily adjusting the number and arrangement of the diaphragms 21 to 24 attached to the windshield 11, the side window glasses 12 to 15, or the rear window glass 16, the sound of various multi-channel audio devices can be adjusted. Playback becomes possible.
[0023]
As described above, in a preferred embodiment of the present invention, when reproducing an audio system having 5.1 channels, 6 channels, or more channels, an audio signal is vibrated in a sound source or an audio system requiring a speaker. The diaphragm to be converted is attached to the windshield 11, the side window glasses 12 to 15, the rear window glass 16, and the roof window glass, etc., and each window glass is used as a speaker, thereby using a multi-channel speaker system in the vehicle interior. To construct an audio device composed of
[0024]
When a 5.1-channel or 6-channel multi-channel system is constructed in a vehicle interior, it is often difficult to properly install a center speaker. This means that the center speaker must be installed near the center console or dashboard in the cabin, but it is enough to install the speaker around it without compromising occupant safety. In most cases, there is no space for installation. Therefore, a diaphragm for transmitting an audio signal can be attached to the windshield 11 of the vehicle, and the windshield 11 itself can be vibrated to be driven as a center speaker. For this reason, it is possible to secure an appropriate place as a front speaker in all vehicles having the front window glass 11 without causing a problem of a speaker installation location.
[0025]
Further, the present invention can be used as a speaker by attaching a diaphragm for converting an audio signal to vibration not only on the windshield 11 but also on a roof window including door windows 12 to 14 and a sunroof. Therefore, this makes it possible to easily install multi-channel speakers exceeding four channels in the vehicle interior, which has been very difficult until now. This also makes it possible to reproduce a space such as a stadium or a music hall with a large number of speakers.
[0026]
FIG. 9 shows another embodiment. In this embodiment, the piezoelectric ceramic 50 is bonded to the inner surface of the vibration plate 21 and electrodes 51 and 52 are provided on both surfaces of the piezoelectric ceramic 50, respectively. Here, the audio signal from the DPS 42 is converted into an analog signal by the D / A converter 47, amplified by the amplifier 44, and applied between the electrodes 51 and 52 of the piezoelectric ceramic 50. Then, the piezoelectric ceramic 50 expands and contracts in the surface direction, for example, the vertical direction in FIG. Accordingly, the diaphragm 21 vibrates in the thickness direction as indicated by the arrow in response to such expansion and contraction. Therefore, the windshield 11 to which the diaphragm 21 is attached vibrates in the thickness direction. Therefore, the windshield 11 reproduces the audio signal.
[0027]
FIG. 10 shows still another embodiment. In this embodiment, the piezoelectric sheet or the piezoelectric film 55 itself is used as a diaphragm. The piezoelectric film 55 is made of, for example, polyvinylidene fluoride, and has electrodes 56 and 57 on both surfaces thereof. The audio signal obtained by the DSP 42 is converted into an analog signal by the D / A converter 47, amplified by the amplifier 44, and applied between the electrodes 56 and 57 of the piezoelectric film 55, thereby causing the piezoelectric film 55 to move as shown by the arrow. Vibrates in the thickness direction. Therefore, the windshield 11 provided with the piezoelectric film 55 vibrates in the thickness direction to reproduce an audio signal.
[0028]
In general, since the polyvinylidene fluoride constituting the piezoelectric film 55 is a substantially transparent polymer material, the transparent electrodes 56 and 57 are formed on both sides of the piezoelectric film 55, and the windshield is formed via a transparent adhesive. When joined to 11, the windshield 11 can be used as a speaker with almost no loss of visibility of the windshield 11.
[0029]
Although the invention of the present application has been described with reference to the illustrated embodiments, the invention of the present application is not limited to the above embodiments, and various modifications can be made within the technical idea of the invention included in the present application. For example, in the above-described embodiment, the diaphragms 21 to 24 are attached to the windshield 11, the side window glasses 12 to 15, and the rear window glass 16, whereby the window glasses 11 to 16 are used as speakers. It does not preclude the construction of a vehicle audio apparatus by combining a conventional dynamic speaker with a speaker made of such a window glass. That is, for example, a woofer composed of a dynamic speaker can be disposed inside a rear deck or a rear trunk, and such a woofer can be used in combination with a speaker having a diaphragm attached to a window glass.
The main invention of the present application is such that a diaphragm is joined to a window glass of a vehicle, and a sound is reproduced by vibrating a window glass by the diaphragm according to an audio signal.
[0030]
Therefore, according to such a vehicle audio device, it is possible to reproduce sound without mounting a conventional dynamic speaker in a door or the like, and a vehicle audio device that does not require a conventional speaker is provided. Be built.
[0031]
Another main invention of the present application is that a diaphragm is bonded to each of a plurality of window glasses of a vehicle, and audio signals of at least two or more channels are separately supplied to the plurality of window glass diaphragms. Is reproduced to reproduce sound of two or more channels.
[0032]
Therefore, according to such a vehicle audio apparatus, it is possible to provide a multi-channel vehicle audio apparatus having two or more channels without using a conventional speaker.
[Brief description of the drawings]
FIG. 1 is an external perspective view of an automobile including an audio device.
FIG. 2 is a plan view of the same.
FIG. 3 is a front view of the windshield when viewed from the inside.
FIG. 4 is an enlarged sectional view of a main part showing attachment of a diaphragm to a windshield.
FIG. 5 is a front view of the diaphragm.
FIG. 6 is a front view of a mounting plate to which a magnet is mounted.
FIG. 7 is a perspective view of a main part showing a principle of driving by a coil and a magnet.
FIG. 8 is a block diagram showing a system configuration of the vehicular audio device.
FIG. 9 is an enlarged cross-sectional view of a windshield illustrating a vibration generation mechanism according to another embodiment.
FIG. 10 is an enlarged cross-sectional view of a windshield illustrating a vibration generation mechanism according to still another embodiment.
[Explanation of symbols]
11 ‥‥ windshield, 12 ‥‥ side window glass (front left), 13 ‥‥ side window glass (front right), 14 ‥‥ side window glass (rear left), 15 ‥‥ side window glass (rear right), 16 ‥‥ rear window glass, 21 ‥‥ diaphragm (front), 22 ‥‥ diaphragm (side, front), 23 ‥‥ diaphragm (after side), 24 ‥‥ diaphragm (rear), 30 ‥‥ mounting Board, 31 magnet, 32 support, 33 bracket, 35 coil, 40 disk player, 41 DVD, 42 DSP, 43 electronic volume, 44 amplifier, 45 ‥‥ Operation input unit, 46 ‥‥ CPU, 47 ‥‥ D / A converter, 50 ‥‥ piezoelectric ceramic, 51,52 ‥‥ electrode, 55 ‥‥ piezoelectric film, 56,57 ‥‥ electrode

Claims (12)

An audio device for a vehicle, wherein a diaphragm is joined to a window glass of a vehicle, and a sound is reproduced by vibrating the window glass by the diaphragm according to an audio signal. 2. The diaphragm according to claim 1, wherein the diaphragm has a coil formed of a conductor, the coil is arranged to face a magnet, and the diaphragm is vibrated by passing an audio current through the conductor. 3. Vehicle audio equipment. The audio device for a vehicle according to claim 1, wherein the diaphragm has a plurality of coils, and a magnet is fixedly arranged to face each of the coils. 4. The audio device for a vehicle according to claim 3, wherein a magnet is mounted on a mounting plate, and the mounting plate is fixed to the window glass in the vicinity of an outer peripheral edge of the diaphragm via support means. . 4. The audio system for a vehicle according to claim 3, wherein a magnet is mounted on a mounting plate, and the mounting plate is fixed to a member other than the window glass via a support means. The vehicle audio device according to claim 1, wherein the vibration plate is a vibration plate to which a piezoelectric ceramic is joined, and generates vibration by expansion and contraction of the piezoelectric ceramic in a surface direction. The audio device for a vehicle according to claim 1, wherein the diaphragm is made of a piezoelectric polymer material, electrodes are provided on both surfaces, and an audio signal is applied to the electrodes. A diaphragm is bonded to each of a plurality of window glasses of a vehicle, and sound signals of at least two or more types of channels are separately supplied to the plurality of window glass diaphragms, and the corresponding window glasses are vibrated to thereby provide two or more channels. An audio device for a vehicle, wherein the audio device reproduces the sound of the vehicle. 9. The vehicle according to claim 8, wherein a diaphragm is bonded to each of a windshield and a side window glass of the vehicle, and audio signals of different channels are supplied to the diaphragm of the windshield and the diaphragm of the side window glass. Vehicle audio equipment. 9. The vehicle audio device according to claim 8, wherein a pair of left and right diaphragms are joined to a windshield of the vehicle at a distance from each other, and audio signals of left and right channels are supplied to the left and right diaphragms. 9. The audio device for a vehicle according to claim 8, wherein diaphragms are respectively joined to left and right side window glasses of the vehicle, and left and right channel audio signals are separately supplied to the left and right side window glass diaphragms. . 9. The vehicle audio device according to claim 8, wherein a diaphragm is joined to a rear window glass of the vehicle, and the rear window glass is vibrated to reproduce a sound of a rear channel or a surround channel.

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