JP2018082352A - Light reflector, luminaire, and method for extracting sound from luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: a light reflector which is simple in structure, and small in size and weight, which enables uniform light irradiation, and which can be utilized as an acoustic device; a luminaire; and a method for extracting sounds from the luminaire.SOLUTION: A light reflector 1 mainly comprises a micro foaming resin plate 3, and a piezoelectric element 5. The piezoelectric element 5 is provided on a surface of the micro foaming resin plate 3 as a vibration actuator. The piezoelectric element 5 is disposed at e.g. the substantial center of the micro foaming resin plate 3. The micro foaming resin plate 3 is e.g. a planar plate-like member, which is formed from a micro foaming resin sheet (a porous member having many fine bubbles). The micro foaming resin sheet used in the invention is an insulating resin sheet having a foaming layer at a center, and a non-foaming layer on each face thereof. A luminaire arranged by using the light reflector of the invention is 90% or more in diffuse reflectance. Therefore, it is possible to provide a luminaire without flicker owing to acoustic vibration.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light reflecting plate, an illuminating device, and a method for extracting sound from the illuminating device, which can extract sound by using a light reflecting plate of the illuminating device as a diaphragm.

  Because of energy saving and long life, LED (Light Emitting Diode) illumination has become widespread, and many illuminations using LEDs have been proposed. As these illuminating devices, there is an illuminating device in which a light reflecting plate is disposed inside the frame of the illuminating device for the purpose of improving the illuminance of the illuminating device or for light diffusion, and the light is diffused and reflected.

  For example, a method has been proposed in which a resin foam having an unfoamed layer on the surface is molded into a predetermined shape and used as a reflector. (Patent Document 1).

  Patent Document 1 is an invention relating to a molded body for a reflecting member of a large-sized lighting fixture that has a high reflectance and can diffuse light efficiently, and a method for manufacturing the same. In Patent Document 1, a part of the light irradiated to the reflection part made of micro-foamed resin is reflected on the surface of the non-foamed layer, and a part is reflected on the surface of the internal fine bubbles. Therefore, the light reflected on the surface of the reflecting portion is diffused appropriately.

  Thus, since the reflection part of patent document 1 consists of a resin foam which has a predetermined | prescribed property, it has very high reflectance (specifically, total reflectance is 94% or more). On the other hand, a part of the irradiated light is diffused in the reflection part and transmitted to the outer surface side. Therefore, the transmitted light is also diffused moderately and leaks outside the reflection part. Therefore, the light can be diffused not only to the lower part of the reflecting member molded body but also to the side.

  Further, there is a method of forming a double-structure frame by using an inner reflector and an outer reflector made of a micro resin foam sheet and disposing the inner reflector inside the outer reflector (Patent Document 2).

  In Patent Document 2, the surface side of the inner reflection plate functions as a reflection plate. Accordingly, a first light guide space is formed between the surface side of the inner reflector and the opening. Similarly, the back side of the inner reflector and the front side of the outer reflector function as a reflector. Therefore, a second light guide space is formed between the back surface side of the inner reflecting plate and the front surface side of the outer reflecting plate. Thus, in patent document 2, light can be taken out from two light guide spaces, respectively.

  Further, there has been proposed an acoustic diaphragm for a flat speaker composed of a voice coil, a two-layer adhesive layer sandwiching the voice coil, and a two-layer base material bonded to the voice coil opposite to the adhesive layer ( Patent Document 3).

  In Patent Document 3, a micro-foamed resin having a predetermined cell diameter is used as the base material of the diaphragm. In this flat speaker, a plurality of voice coils are arranged in a predetermined arrangement (an arrangement in which adjacent magnetic pole surfaces are opposite to each other), and the coils are embedded and fixed in a thermosetting resin. In Patent Document 3, the temperature of the linear conductor of the spiral voice coil of the conventional flat speaker increases, the tackiness of the adhesive decreases, and the spiral voice coil peels off from the sheet base material or the insulating base film. This solves the problem that abnormal noise occurs.

  In addition, after forming the speaker diaphragm shape with crystalline thermoplastic synthetic resin, non-reacting gas is infiltrated under pressure, then the pressure is released, and then this is brought to a temperature not lower than the softening temperature of the synthetic resin and not higher than the melting temperature. There has been proposed a method for manufacturing a speaker diaphragm that is heated and foamed to produce a speaker diaphragm (Patent Document 4).

  According to Patent Document 4, it is possible to obtain a speaker diaphragm for a speaker used in an acoustic device having a uniform foamed state, low density, high rigidity, and light weight. This speaker is formed with a magnetic circuit using a magnet. In addition to the diaphragm, the speaker is provided with a frame, a magnet as a magnetic circuit member, a voice coil, a damper, etc., and is separated from the diaphragm. It has a damper which supports the provided voice coil so that it can move up and down. When an external acoustic signal is input to the coil portion of the voice coil, the voice coil moves in the axial direction in accordance with the acoustic signal, thereby driving the speaker diaphragm to emit sound.

  In addition, an LED light source is disposed on the voice coil support, and a device that blinks the LED light source by causing an induction current induced by the vibration of the voice coil to flow through the induction coil by a magnetic field generated by the vibration of the voice coil is proposed. (Patent Document 5).

  In the speaker in Patent Document 5, the LED light source blinks in response to the level of the reproduced sound to satisfy the taste of the audience. Note that Patent Document 5 does not relate to a lighting device, but uses an LED light source as an indicator function for enjoying blinking of an LED light source that blinks due to fluctuations in the sound pressure of vibration.

  A light source unit; a circuit board on which a predetermined circuit is mounted; a base used to supply power to the light source unit and the circuit; a translucent cover that covers the light source unit; an outer portion surrounding the circuit board; A light bulb-type light source device having a heat-dissipating metal casing that is thermally connected to the unit has been proposed (Patent Document 6).

  The light bulb-type light source device of Patent Document 6 further includes a speaker driving board on which a speaker driving circuit for driving a speaker is mounted. Further, in the light bulb-type light source device of Patent Document 6, a protruding portion that protrudes from the outer portion toward the circuit board for the thermal connection with a predetermined circuit protrudes toward the speaker drive substrate.

  In addition, a piezoelectric acoustic device has been proposed in which a peripheral portion of a piezoelectric vibrator having a piezoelectric element attached to a diaphragm is made of foamed resin or low-density carbon (Patent Document 7).

  In the piezoelectric acoustic device of Patent Document 7, the peripheral portion of a piezoelectric vibrator having a piezoelectric element attached to a vibration plate is supported by a peripheral member. The peripheral portion of the piezoelectric vibrator is supported by the peripheral member via the support member, and the density of the material constituting the piezoelectric element, the vibration plate, the support member, and the peripheral member is the piezoelectric element, the vibration plate, the support member, and the peripheral member. It becomes small in order.

  In addition, an invention of a dust removing device is proposed that includes a piezoelectric element composed of a piezoelectric material and a pair of opposing electrodes, a vibration member, and a fixing member having at least a polymer compound component (Patent Document 8).

  In Patent Document 8, the phase transition temperature T from the first ferroelectric crystal phase to the second ferroelectric crystal phase of a piezoelectric material mounted on a substrate such as a camera is −60 ° C. ≦ T ≦ −5 ° C. It is disclosed.

  In addition, there has been proposed a knocking detection device in which a vibration detection body is covered by a cover that sandwiches the outer periphery of the buffer member with a housing (Patent Document 9).

  The knocking detection device of Patent Document 9 includes a housing having a protrusion on the side opposite to the contact surface with a vibrating body, a piezoelectric element, and a diaphragm that is bonded and fixed to one end face of the piezoelectric element. The vibration detector is fixed to the protrusion on the side opposite to the contact surface of the diaphragm. The buffer member is disposed between the bottom portion formed on the non-contact surface side of the housing and the diaphragm. The buffer member is made of a silicon-based foamed resin.

JP 2013-242345 A Japanese Patent No. 6014852 JP 2006-287924 A JP 2003-125497 A Japanese Patent Laid-Open No. 2003-023693 JP 2013-225418 A JP 2001-339793 A JP 2013-218259 A JP-A-8-278190

  However, Patent Literature 1 and Patent Literature 2 relate to a simple lighting device and cannot emit sound from the lighting device.

  In Patent Document 3, it is necessary to use a plurality of voice coils, magnets, yokes, frames, and the like in order to give a speaker function to the lighting device. In addition, since the support structure such as a substrate to which the LED light source is attached and the reflector are separate, there is a problem that the number of parts increases and the structure becomes complicated.

  Patent Document 4 requires a magnetic circuit using a magnet, a voice coil, a damper, and a diaphragm. For this reason, there exists a problem that an illuminating device enlarges.

  In addition, the illumination device of Patent Document 5 separately arranges an LED light source separately from a diaphragm of an electrodynamic direct radiation type speaker using a magnet, a voice coil, and a diaphragm. For this reason, it is difficult to reduce the size of the apparatus. Further, since the LED light source only flashes instantaneously, it cannot be used as a lighting device. Further, the piezoelectric element is not attached to a light reflecting plate that also serves as a sound vibration plate.

  Further, Patent Document 6 provides a speaker in a part of the lighting device, but light cannot be extracted from the speaker part, and the diaphragm of the lighting device and the speaker is not integrated, and as a light reflecting plate, It is not a micro foamed resin plate that is attached to a light reflecting plate that also serves as a sound vibration plate.

  Moreover, although patent document 7 is related with a piezoelectric acoustic apparatus, this cannot be used as an illuminating device. Similarly, although patent document 8 is related with a dust removal apparatus, this cannot be used as an illuminating device. Similarly, although patent document 9 is related with a knocking detection apparatus, this cannot be used as an illuminating device. As described above, by using the light reflecting plate made of micro-foamed resin itself as the acoustic diaphragm of the lighting device, the light reflecting plate that also serves as the acoustic diaphragm is used as the light reflection characteristic of acoustic vibration. It was never done in consideration of the impact on the environment.

  The present invention has been made in view of such problems, and has a simple structure, is compact, can irradiate light uniformly, and can also be used as an acoustic device by suppressing flickering of a light reflecting plate. It is an object of the present invention to provide a light reflector that can be used, and to provide a small and light illumination device using the reflector and a method for extracting sound from the illumination device.

  In order to achieve the above-described object, the first invention is a micro-foamed resin plate having a diffuse reflectance of light of 90% or more with respect to an aluminum oxide standard plate in a visible light region having a wavelength of 450 nm to 650 nm, and the micro-foamed resin plate And a piezoelectric element provided as a vibration actuator on the surface of the light reflecting plate. By using this light reflecting plate, it is possible to suppress flickering induced by fluctuation of reflected light in the light reflecting plate due to vibration of the piezoelectric element. Therefore, the light reflecting plate can be used as a light reflecting plate that also serves as an acoustic vibration plate.

  In this case, the micro foamed resin plate may be provided with the piezoelectric element in a recess. The recess of the micro foam resin plate may be provided with an opening and a recess, or the micro foam resin plate is bent and provided with only a recess without providing an opening. It may be.

  An LED light source may be disposed at a position different from at least one of the piezoelectric elements on the front surface or the back surface of the micro-foamed resin plate.

  Also in this case, the micro foamed resin plate may be provided with the piezoelectric element in a recessed portion. The recess of the micro foam resin plate may be provided with an opening and a recess, or the micro foam resin plate is bent and provided with only a recess without providing an opening. It may be.

  The concave portion has a shape formed by a curved surface portion opened upward, or a wall portion, a shape formed by a curved surface portion opened upward, a substantially inverted truncated pyramid shape opened substantially upward, and a substantially inverted truncated cone shape The shape may be either a rectangular shape or a substantially rectangular parallelepiped shape.

  The micro-foamed resin plate has a light diffuse reflectance and a total reflectance of 90% or more with respect to the aluminum oxide standard plate in a visible light region having a wavelength of 450 nm to 650 nm, and a diffuse reflectance and a total reflection in the visible light region. It is desirable that the wavelength dependency of the rate is within ± 2%.

  The micro-foamed resin plate may be at least one of PET resin, PC resin, acrylic resin, and flame-retardant acrylic resin.

  According to the first invention, by providing the piezoelectric element as the vibration actuator on the surface of the micro foam resin plate, the reflection plate having a high diffuse reflectance can be functioned as the vibration plate. Furthermore, if the diffused reflectance of light of the micro foamed resin plate is 90% or more, uniform light can be taken out, and at the same time, the diffused reflectance is high, so that the speaker is used. Since the flickering of light can be suppressed even when it is vibrated, a piezoelectric element can be provided on the light reflecting plate.

  Further, by arranging both the LED light source and the piezoelectric element on one micro foamed resin plate, there is no need to separately use a support member for the LED light source and a support member for the piezoelectric element, and the number of parts is small, and the device Can be reduced in size and weight.

  Moreover, the light guide space in which light can be diffused and reflected a plurality of times can be formed by forming a recess in the micro-foamed resin plate. Furthermore, by providing the piezoelectric element in the recess, directivity can be imparted to the speaker as compared with the case where the piezoelectric element is provided on the flat plate. Here, by the formation of the dent portion, it is possible to perform diffuse reflection many times within the light guide space formed by the dent portion. For this reason, light can be made uniform by diffuse reflection by the light reflecting plate. In addition, the formation of the depression makes it possible to substantially match the center of the irradiation region of the reflected light with the region having the strongest directivity of the speaker.

  In addition, as the shape of the hollow portion, the shape formed by the curved surface portion opened upward, or the shape formed by the curved surface portion having the wall portion opened upward, the substantially inverted truncated pyramid shape opened upward, The present invention can be applied to various shapes such as a substantially inverted truncated cone shape or a substantially rectangular parallelepiped shape.

  Moreover, if the light diffuse reflectance of the micro foamed resin plate is 90% or more, uniform light can be extracted. In addition, since the diffuse reflectance is high, flickering of light can be suppressed even when the light reflection plate is vibrated in order to use a speaker.

  Various materials such as a PET resin, a PC resin, an acrylic resin, and a flame-retardant acrylic resin can be applied as the micro-foamed resin plate.

  According to a second aspect of the present invention, there is provided an illuminating device comprising a light reflecting plate that also serves as the acoustic diaphragm according to the first aspect of the present invention. Therefore, even when the light reflection plate is vibrated, the diffuse reflection factor of the light reflection plate is high, so that an illumination device without flickering can be obtained.

  The micro-foamed resin plate has an opening provided in an upper portion and the recess formed downward from the opening, and the LED light source is provided on the recess of the micro-foam resin plate. Arranged on the surface, the opening is covered with a light transmitting member, light is taken out from the opening, and the piezoelectric element is a back surface of the recess of the micro foam resin plate or the recess of the micro foam resin plate. It may be arranged on the surface of the part different from the LED light source.

  The hollow portion has a wall portion, the LED light source is provided on the wall portion, and the piezoelectric element is disposed on a flat portion at the rear surface of the micro-foamed resin plate and substantially at the center of the hollow portion. May be.

  At least a part of the wiring of the LED light source or the piezoelectric element may be arranged along the micro foamed resin plate, thereby obtaining a stable acoustic vibration. Even if at least a part of the wiring is wired along the micro-foamed resin plate, the light reflectance of the micro-foamed resin plate is high, so that there is no significant influence on the reflectivity of the reflecting plate as a whole.

  The concave portion has a shape formed by a curved surface portion opened upward, or a wall portion, a shape formed by a curved surface portion opened upward, a substantially inverted truncated pyramid shape opened substantially upward, and a substantially inverted truncated cone shape You may comprise either a shape or a substantially rectangular parallelepiped shape.

  The micro-foamed resin plate has a light diffuse reflectance and a total reflectance of 90% or more with respect to the aluminum oxide standard plate in a visible light region having a wavelength of 450 nm to 650 nm, and a diffuse reflectance and a total reflection in the visible light region. It is desirable that the wavelength dependency of the rate is within ± 2%.

  According to a third aspect of the present invention, there is provided an outer reflecting plate made of a micro-foamed resin having a diffuse reflectance of 90% or more with respect to an aluminum oxide standard plate in a visible light region having a wavelength of 450 nm to 650 nm, and an inner portion of the outer reflecting plate. A micro-foamed resin-made inner reflector, and a pair of micro-foamed resin plates, the outer reflector and the inner reflector each having an opening provided at the upper portion and the opening A recess is formed downward from the inner reflector, and the recess of the inner reflector and the outer reflector are spaced apart from each other, and the first LED light source is a surface of the recess of the inner reflector. The second LED light source is disposed on the front surface of the recessed portion of the outer reflecting plate or the back surface of the recessed portion of the inner reflecting plate, and the opening of the inner reflecting plate and the inner reflecting plate Previous Around the opening, light is extracted from the opening between the inner reflector and the outer reflector, respectively, and the openings of the inner reflector and the outer reflector are each covered with a light transmitting member, In the illumination device, the piezoelectric element is disposed on a back surface of the inner reflection plate or a front surface of the outer reflection plate, at a position different from the second LED light source, or on the back surface of the outer reflection plate. There may be.

  In this case, the first LED light source is disposed on the surface of the inner reflector, the second LED light source is disposed on the back surface of the inner reflector, and the piezoelectric element is disposed on the surface of the outer reflector or It may be arranged on the back side.

  The opposing surfaces of the recesses of the inner reflector and the outer reflector face each other with a predetermined distance apart, and the piezoelectric element is a flat portion at the substantially center of the inner reflector or the outer reflector. May be arranged.

  At least a part of the wiring of the first LED light source, the second LED light source, or the piezoelectric element may be disposed along the micro-foamed resin plate. Even if at least a part of the wiring is wired along the micro-foamed resin plate, the light reflectance of the micro-foamed resin plate is high, so that there is no significant influence on the reflectivity of the reflecting plate as a whole.

  Each of the recessed portions of the inner reflector and the outer reflector has a shape formed by a curved surface portion opened upward, or a wall portion formed substantially vertically downward with respect to the light transmitting member. And having a shape formed by a curved surface portion having an upper opening, a substantially inverted truncated pyramid shape having an upper opening, a substantially inverted truncated cone shape, or a substantially rectangular parallelepiped shape, and the recess portion of the inner reflecting plate And the said recessed part of the said outside reflecting plate may be a substantially similar shape.

  The micro-foamed resin plate has a light diffuse reflectance and a total reflectance of 90% or more with respect to the aluminum oxide standard plate in a visible light region having a wavelength of 450 nm to 650 nm, and a diffuse reflectance and a total reflection in the visible light region. It is desirable that the wavelength dependency of the rate is within ± 2%.

  The first LED light source may be a white or daylight color LED light source, and the second LED light source may be a colored LED light source. Furthermore, since the wavelength dependence of diffuse reflectance and total reflectance in the visible light region is within ± 2%, even if a colored LED light source is used as the second LED light source, the decorating property is improved and the light efficiency is improved. Can be taken out well.

  Here, the thickness of the portion of the micro-foamed resin plate where the piezoelectric element is affixed and the vicinity thereof may be formed thinner than the thickness of the outer peripheral portion of the micro-foamed resin plate. Since the thickness of the portion where the piezoelectric element is affixed and the micro foam resin plate in the vicinity of it are thin, the light reflector can be vibrated with a small amount of power when driven from the outside. The rigidity can be kept high. Note that the thickness of the light reflecting plate to which the piezoelectric element is not attached need not be as described above.

  In consideration of the balance between light reflection characteristics and acoustic characteristics, it is desirable that the thickness of the hollow portion of the micro-foamed resin plate be in the range of 0.3 mm to 0.8 mm.

  In the second and third aspects of the invention, the lighting device may be a lighting device for indoor lighting, induction lighting, or lighting for automobiles, railway vehicles, and aircraft.

  According to the second aspect of the present invention, it is possible to obtain an illumination device having a speaker function and having a high reflectance. At this time, since the piezoelectric element is directly installed on the light reflecting plate, a compact and lightweight illumination device can be obtained. The illumination device of the second invention has a diffuse reflectance of 90% or more of the light reflecting plate, so that uniform light can be taken out, and at the same time, the diffuse reflectance is high so that the speaker can be used. In addition, a speaker-integrated illumination device that suppresses flickering of light can be realized.

  Here, the flicker of the speaker will be described in detail. The light reflection plate that also serves as the acoustic vibration plate vibrates due to vibration when the speaker is used. At this time, for example, when a metal light reflector having a high regular reflectance is used, the temporal and spatial fluctuations in the luminance distribution on the reflector surface accompanying fine vibrations of the light reflector occur. There is a risk that light flickers due to a change in the reflection direction or the reflection intensity of light.

  On the other hand, in the present invention, since the light reflecting plate is made of a micro foamed resin, it has an extremely high diffuse reflectance. That is, the distribution of the reflection direction with respect to the incident direction of light becomes gentle compared to a conventional metal plate or the like. For this reason, even if the light reflecting plate vibrates, the light distribution direction and the reflection intensity are hardly changed due to temporal and spatial fluctuations in the luminance distribution on the reflecting plate surface. As a result, flickering of reflected light during vibration can be reduced. Thus, since flickering of illumination due to vibration can be prevented, the light reflection plate can be used as the vibration plate, and a small and light speaker-integrated illumination device with a speaker can be obtained. Here, the flicker increases as the value of the voltage applied to the speaker increases and the sound pressure level increases.

  Moreover, if the opening part of the upper part of a hollow part is covered with the light transmissive member, the penetration | invasion of the foreign material to the inside of an illuminating device, etc. can be suppressed.

  In addition, the LED light source is provided on the wall portion of the recess, and the piezoelectric element is provided on the flat portion at the substantially center of the recess, so that the LED light source and the piezoelectric element can be arranged separately. Thus, by arranging the LED light source at a position away from the position where the piezoelectric element of the light reflecting plate is pasted, the influence on the vibration characteristics by the LED light source can be avoided. For this reason, the influence on the vibration of the light reflection plate by the weight of the LED light source being superimposed can be reduced. For this reason, deterioration of acoustic characteristics can be reduced.

  Further, by separating the LED light source from the position of the piezoelectric element, it is possible to prevent looseness and a decrease in strength of the LED light emitting element and the solder connection part of the wiring connection part in the LED light source installation part. Therefore, a speaker-integrated illumination device with a speaker excellent in durability can be obtained.

  Moreover, if at least a part of the wiring of the LED light source or the piezoelectric element is arranged along the micro foam resin plate, it is possible to suppress the formation of a shadow of light due to the wiring or the like. Therefore, there is no significant influence on the reflectivity of the entire reflector.

  In addition, the shape of the hollow portion is a shape formed by a curved surface portion opened upward, or a shape formed by a wall portion substantially perpendicular to the light transmitting member and a curved surface portion opened upward, and the upper portion opened The present invention can be applied to various shapes including any of the substantially inverted truncated pyramid shape, substantially inverted truncated cone shape, or substantially rectangular parallelepiped shape.

  Further, if the diffuse reflectance of light is 90% or more, the light reflectance is high, so that almost uniform light can be extracted from the opening.

  According to the third invention, the same effect as that of the second invention can be obtained. In particular, since the recesses of the inner reflector and the outer reflector are spaced apart from each other and face each other, independent light guide spaces can be formed on the front and back sides of the inner reflector. That is, by diffusely reflecting the light on the surface side of the inner reflector, the light from the opening of the inner reflector can be made uniform, and the light is diffusely reflected on the back side of the inner reflector and the surface side of the outer reflector. By making it, the light from the opening part between an inner side reflecting plate and an outer side reflecting plate can be made uniform.

  Here, in the illumination device of the third invention, both the inner reflector and the outer reflector have a diffuse reflectance of 90% or more, so that uniform light can be taken out and at the same time the diffuse reflectance is high. Thus, it is possible to realize a speaker-integrated illumination device that suppresses light flicker even when the speaker is used. Further, the first LED light source is disposed on the surface of the inner reflector, and the piezoelectric element is disposed in the recess of the inner reflector or the outer reflector, so that the region having the strongest directivity of the speaker and the inner reflector It is possible to substantially match the center of the reflected light irradiation area.

  At this time, light can be efficiently diffused and reflected by using a micro-foamed resin plate as the inner reflecting plate and the outer reflecting plate, respectively. For this reason, it can be extracted with less light absorption and uniform illuminance. Thus, by using a multi-layer structure in which the inner reflector and the outer reflector are stacked, light can be separately taken out from each space, and the lighting device can be reduced in size and weight.

  At this time, the first LED light source is disposed on the front surface of the inner reflector, the second LED light source is disposed on the rear surface of the inner reflector, and the piezoelectric element is disposed on the rear surface of the outer reflector. The first LED light source and the second LED light source can be arranged on separate reflectors. For this reason, the influence on the vibration characteristic by each LED light source can be avoided, and the influence on the vibration of the light reflecting plate due to the weight of the LED light source being superimposed can be reduced. Thereby, deterioration of acoustic characteristics can be prevented.

  Further, if the piezoelectric element is disposed on the flat portion at the substantially center of the inner reflecting plate or the outer reflecting plate, the piezoelectric element can be reliably bonded to the inner reflecting plate or the outer reflecting plate, and the inner reflection can be efficiently performed. The plate or the outer reflector can be vibrated.

  Moreover, if at least a part of the wiring of the first LED light source, the second LED light source, or the piezoelectric element is arranged along the micro foamed resin plate, it is possible to suppress the formation of a shadow of light due to the wiring or the like. However, since the light reflectance of the micro-foamed resin plate is high, there is no significant influence on the reflectance of the entire reflecting plate.

  In addition, if the recesses of the inner reflector and the outer reflector are formed in a predetermined shape and the recesses of the inner reflector and the outer reflector are substantially similar, the inner reflector and the outer reflector It is possible to reliably secure a gap with the reflecting plate and extract light.

  Even in this case, if the diffuse reflectance of light is 90% or more for both the inner reflector and the outer reflector, the light reflectance is high, so that almost uniform light can be extracted from each opening. .

  Moreover, the light from a 1st LED light source can be utilized as practical illumination by making a 1st LED light source into a white or daylight color LED light source. Moreover, the light from a 2nd LED light source can be utilized as illumination for decoration, for example by making a 2nd LED light source into a colored LED light source. Here, both the diffuse reflectance and the total reflectance of light with respect to the aluminum oxide standard plate in the visible light region having a wavelength of 450 nm to 650 nm are both 90% or more, and further, the wavelength dependence of the diffuse reflectance and the total reflectance in the visible light region is Since it is within ± 2%, the light from the second LED light source can be efficiently extracted even if the second LED light source is used as decorative illumination and colored light is used.

  Such illumination devices according to the second and third inventions are particularly suitable for illumination devices for interior illumination, induction illumination, or illumination of automobiles, railway vehicles, and aircraft.

  4th invention uses the illuminating device based on 2nd invention or 3rd invention, and receives the audio | voice signal or music signal transmitted by radio | wireless from the portable information device with a receiver, The said audio | voice signal or music signal is received. The micro-foamed resin plate on which the piezoelectric element is arranged by vibrating the piezoelectric element by amplifying with an amplifier or an amplifier circuit and connecting the receiver, the amplifier or the amplifier circuit and the piezoelectric element with wiring This is a method for extracting sound from a lighting device, wherein sound or music is extracted by vibrating the sound.

  Further, the fourth invention uses the lighting device according to the second invention or the third invention, and connects the information terminal and the amplifier or the amplifier circuit with wiring, and the audio signal or music signal transmitted from the information terminal is connected. Amplifying by the amplifier or the amplifier circuit, and connecting the amplifier or the amplifier circuit and the piezoelectric element by wiring, the piezoelectric element is vibrated, and the micro foamed resin plate on which the piezoelectric element is arranged is acoustically It is a method for extracting sound from a lighting device, wherein the sound or music is extracted by vibrating. Here, since the information terminal and the amplifier or amplifier circuit can be directly connected by wiring, it is suitable to be used in a fixed position in a home or facility.

  According to the fourth invention, music or voice can be efficiently extracted from the lighting device by transmitting a voice signal or a music signal from the information terminal to the lighting device.

  At this time, for example, by transmitting and receiving audio signals or music signals wirelessly such as BlueTooth (registered trademark), it is not necessary to connect the information device and the lighting device by wire.

  According to the present invention, there is provided a light reflecting plate, an illuminating device, and a method for extracting sound from the illuminating device that are simple in structure, small in size, capable of uniformly irradiating light, and also usable as an acoustic device. Can be provided.

The figure which shows the light reflecting plate 1. FIG. (A) is a figure which shows the light reflection board 1a, (b) is a figure which shows the light reflection board 1b, (c) is a figure which shows the light reflection board 1c. The perspective view of the illuminating device 10. FIG. It is sectional drawing of the illuminating device 10, Comprising: The AA sectional view taken on the line of FIG. (A) is sectional drawing of the illuminating device 10, Comprising: The BB sectional drawing of FIG. 5, (b) is sectional drawing of the illuminating device 10a. (A) is sectional drawing of the illuminating device 10b, (b) is sectional drawing of the illuminating device 10c. The perspective view of the illuminating device 10d. (A) is sectional drawing of the illuminating device 10d, Comprising: CC sectional view taken on the line of FIG. 7, (b) is sectional drawing of the illuminating device 10d, DD sectional view taken on the line of FIG. (A) is sectional drawing of the illuminating device 10e, (b) is sectional drawing of the illuminating device 10f. The perspective view of the illuminating device 10g. (A) is sectional drawing of the illuminating device 10g, Comprising: The EE sectional view taken on the line of FIG. 10, (b) is sectional drawing of the illuminating device 10g, Comprising: The FF sectional view taken on the line of FIG. (A) is sectional drawing of the illuminating device 10h, (b) is sectional drawing of the illuminating device 10i.

(Light reflector)

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing the light reflecting plate 1. The light reflecting plate 1 mainly includes a micro foamed resin plate 3 and a piezoelectric element 5. The piezoelectric element 5 is provided on the surface of the micro foam resin plate 3 as a vibration actuator. The piezoelectric element 5 is disposed, for example, approximately at the center of the micro foamed resin plate 3.

  The micro-foamed resin plate 3 is, for example, a flat plate-like member, and is formed from a micro-foamed resin sheet (a porous member having a large number of fine bubbles). The microfoamed resin sheet used in the present invention is an insulating resin sheet having a foamed layer at the center and non-foamed layers on both sides. Here, the foam layer refers to a layer in which bubbles are generated by foaming.

  The thickness of the micro-foamed resin plate 3 is preferably 0.5 mm to 1.4 mm, and the thickness of the non-foamed layer on the surface is preferably 10 to 30 μm. When the thickness of the micro-foamed resin plate 3 is less than 0.5 mm, the light transmission loss in the light reflecting plate 1 increases. For this reason, it is desirable that the thickness of the micro-foamed resin plate 3 is 0.5 mm to 1.4 mm from the light reflection characteristics.

  On the other hand, in consideration of the case where the light reflection plate 1 is used as an acoustic vibration plate, it is desirable that the micro-foamed resin plate 3 has high rigidity and low density. Further, in order to reduce the size and weight of the light reflecting plate 1 (speaker), it is necessary to reduce the driving energy for obtaining a predetermined displacement when the diaphragm vibrates. For this purpose, the thickness of the micro foam resin plate 3 is The thinner one is desirable. In particular, if the thickness of the micro-foamed resin plate 3 is thin, the power for vibrating the diaphragm of the speaker can be reduced. Therefore, it is desirable that the upper limit of the plate thickness is thin. On the other hand, since the rigidity of the micro foam resin plate 3 becomes larger than necessary when the thickness is 1.2 mm or more, the thickness of the micro foam resin plate 3 is preferably in the range of 0.5 mm to 1.2 mm. .

  In addition, the reflection plate formed with the micro-foamed resin plate 3 has a plate thickness that is reduced, for example, by forming a hollow portion, which will be described later. Therefore, less driving power is applied to the piezoelectric element 5 for obtaining a predetermined sound pressure level. And excellent vibration characteristics at high temperatures. On the other hand, since the light transmission loss of the reflector increases and the rigidity decreases, the thickness of the reflector after molding is preferably in the range of 0.4 mm to 0.8 mm, but depending on the shape of the molded product Since it is also possible that the thickness is thinner, the lower limit of the thickness of the molded product is allowed up to 0.3 mm.

  Further, only the thickness of the portion of the micro foam resin plate 3 where the piezoelectric element 5 is attached and the thickness in the vicinity thereof may be formed thinner than the thickness of the outer peripheral portion of the micro foam resin plate 3. As described above, the micro foam resin plate 3 is vibrated with a small amount of electric power when driven from the outside, by forming the thickness of the micro foam resin plate 3 near the portion where the piezoelectric element 5 is pasted. be able to. Moreover, the rigidity as a diaphragm can be kept high.

  The micro-foamed resin plate 3 is preferably excellent in frequency characteristics to be provided as an acoustic vibration plate of a speaker. Furthermore, it is desirable that the micro-foamed resin plate 3 has excellent properties such as moisture resistance, heat resistance, UV resistance, fatigue resistance, and weather resistance, and can be easily processed.

  Further, since the micro foam resin plate 3 has a very small density, the harmonic distortion is extremely small. Further, since the micro foam resin plate 3 has a low density, the light reflection plate 1 can be reduced in weight. Further, the reproduction sound pressure characteristic (sound pressure level) when the micro foamed resin plate 3 is used as an acoustic diaphragm is good. Here, the average cell diameter of the micro-foamed resin plate 3 is desirably 20 μm or less, and more desirably 10 μm or less.

  Here, if the average bubble diameter is too small, the light transmittance increases and the reflectance decreases. In addition, if the average bubble diameter is too large, the diffuse reflectance decreases, so the average bubble diameter needs to be 0.2 μm to 20 μm. Furthermore, the average bubble diameter is preferably 0.5 μm to 10 μm.

  As an optical characteristic of the micro-foamed resin plate 3 in the visible light region with a wavelength of 450 nm to 650 nm, the light reflectance when using an aluminum oxide standard plate is 90% or more for total reflectance and 90% or more for diffuse reflectance. It is desirable that the wavelength dependency of the reflectance is 2% or less, preferably 1% or less. Both the total reflectance and the diffuse reflectance are preferably 95% or more.

Here, the micro-foamed resin plate 3 has insulating properties, and its volume resistivity is desirably 10 ¹² Ω to 10 ¹⁷ Ω. Within this range, sufficient insulation can be ensured.

  The micro-foamed resin plate 3 is made of at least PET resin (polyethylene terephthalate resin), PC resin (polycarbonate resin), flame retardant PC resin, acrylic resin, flame retardant acrylic resin, or PMMA resin (polymethyl methacrylate resin). It is preferable to comprise either. In addition to the above, for the micro-foamed resin plate 3, a transparent resin obtained by imparting flame retardancy to an acrylic resin such as a cycloolefin polymer or polyacrylonitrile can also be used. Moreover, you may use the microfoaming resin board 3 by which the process of antistatic, provision of a flame retardance, an ultraviolet-resistant coating, etc. was carried out by the place and use to use.

  The piezoelectric element 5 is an element made of a piezoelectric material. Piezoelectric materials are substances that generate positive and negative charges on the surface of the material when stress is applied to the surface. Due to the polarized charge of such a material, a voltage can be taken out from the front and back according to the stress. Further, when a voltage is applied to such a material, the material is distorted. That is, when an electric signal is applied to such a material, mechanical vibration can be extracted. Such a phenomenon showing a mutual conversion action between mechanical pressure and electricity is called a piezoelectric effect, and a material showing the piezoelectric effect is called a piezoelectric material.

  When applying stress to a crystal that does not have a center of symmetry, the piezoelectric effect generates dielectric polarization proportional to the stress, and positive and negative charges appear on both ends of the crystal, and when an electric field is applied to the crystal. In addition, there is a piezoelectric inverse effect that causes distortion in proportion to the electric field, generates mechanical stress, and vibrates the diaphragm. The present invention utilizes the piezoelectric inverse effect.

  Such piezoelectric materials include quartz, ceramic materials, and polymer materials, but frequently used piezoelectric materials include PZT (zirconate titanate), lithium niobate, and barium titanate. . An example of the polymer material is polyvinylidene fluoride (PVDF).

  When an electric pulse is applied to the piezoelectric element 5 (piezoelectric material), a sound wave is generated by mechanical expansion and contraction, and a sound wave is generated in the direction of both surfaces of the electrode plate. For this reason, when sound waves are generated only in one direction of the electrode plate, a backing material can be attached to one side of the vibrator and the sound waves can be taken out only from one side. In the present invention, it is not necessary to attach a backing material. For example, a piezoelectric dynamic speaker manufactured by Murata Manufacturing Co., Ltd. has an ultra-thin shape of 0.5 to 1.2 mm by using a strip-shaped acoustic diaphragm.

  Here, examples of the piezoelectric element include a unimorph type, a bimorph type, and a laminated type. The unimorph type has a structure in which a thin piezoelectric element and a metal plate are bonded together. When the piezoelectric element expands and contracts in the plane, warpage occurs because the dimensions of the bonded metal plates remain the same. The vibration and displacement generated by the voltage applied to the piezoelectric element are used.

  The bimorph type has a structure in which two piezoelectric elements are bonded to each other, and is used when a relatively large displacement is obtained. When a differential voltage is applied to each of the two piezoelectric elements, warping occurs because the expansion and contraction directions are opposite. In addition, the laminated type is a rod in which a large number of piezoelectric elements are stacked, and uses displacement in the thickness direction.

  The piezoelectric element 5 of this embodiment has a basic structure of an element in which an amount of piezoelectric material is sandwiched between two electrodes, and has a structure in which a thin piezoelectric element and a metal plate are bonded together. When the piezoelectric element 5 expands and contracts in the plane, warping occurs because the dimensions of the bonded metal plates remain the same. The vibration generated by the voltage applied to the piezoelectric element 5 can be used to convert it into sound. At this time, the sound pressure level can be changed by changing the magnitude of distortion of the piezoelectric element 5 depending on the magnitude of the voltage applied when applying the signal voltage to the electrodes. Usually, the piezoelectric element 5 is configured by sandwiching the piezoelectric material between the upper electrode and the lower electrode, and current is applied from the electrode of the piezoelectric element 5 to the piezoelectric material. At this time, since the light reflection plate 1 has a high diffuse reflectance of 90%, the reflection direction and the reflection intensity of the reflected light change due to fluctuations caused by the change in the temporal and spatial distribution of the luminance of the reflection plate due to vibration. The resulting flicker can be suppressed.

  When the piezoelectric element 5 is driven, the micro foam resin plate 3 vibrates by the piezoelectric element 5, and the micro foam resin plate 3 functions as an acoustic vibration plate. That is, the light reflecting plate 1 can be made to function as a speaker, assuming that the surface has high light reflection characteristics.

  In addition, the LED light source is not directly arranged on the light reflection plate 1. For this reason, when using the light reflecting plate 1 as a lighting device, it is necessary to separately arrange an LED light source at a position where light can be incident on the light reflecting plate 1 or a position facing the light reflecting plate 1.

  On the other hand, you may arrange | position the LED light source 7 to the micro foaming resin board 3 like the light reflection board 1a shown to Fig.2 (a). The light reflecting plate 1 a is provided with the piezoelectric element 5 and the LED light source 7 on different surfaces with respect to the micro foamed resin plate 3. At this time, the piezoelectric element 5 is disposed substantially at the center of the micro-foamed resin plate 3, and the LED light source 7 is disposed at a position away from the piezoelectric element 5.

  Similarly, the piezoelectric element 5 and the LED light source 7 may be provided on the same surface with respect to the micro-foamed resin plate 3 as in the light reflecting plate 1b shown in FIG. Even in this case, it is preferable that the piezoelectric element 5 is disposed substantially at the center of the micro-foamed resin plate 3 and the LED light source 7 is disposed at a position away from the piezoelectric element 5.

  Further, like the light reflecting plate 1c shown in FIG. 2C, the piezoelectric element 5 and the LED light source 7 are disposed on the opposite side with respect to the micro foamed resin plate 3 and at the same corresponding positions. May be. As described above, the piezoelectric element 5 may be disposed on the surface of the micro foam resin plate 3, and the LED light source 7 may be disposed on at least one of the front surface or the back surface of the micro foam resin plate 3.

  Moreover, although the light reflecting plates 1, 1a, 1b, and 1c all show an example using a plate-like flat micro-foamed resin plate 3, the present invention is not limited to this. For example, you may form a hollow part in the micro foaming resin board 3. FIG. The hollow portion may be formed in a curved shape as a whole, or may have a flat portion in a part of the curved shape. Although the details will be described later, the hollow portion is a shape formed by a curved surface portion opened upward, or a shape formed by a wall portion and a curved surface portion opened upward, a substantially inverted truncated pyramid shape opened upward, You may comprise either a substantially inverted truncated cone shape or a substantially rectangular parallelepiped shape.

(Lighting device)
(First embodiment)
Next, an illuminating device including the light reflecting plate as described above will be described. FIG. 3 is a perspective view showing the lighting device 10. 4 and 5 (a) are cross-sectional views of the illumination device 10, FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 5 (a) is a cross-sectional view taken along line BB in FIG. FIG.

  The illuminating device 10 mainly includes a light reflecting plate 1d, a light transmitting member 11, a switch 13, and the like. The light reflecting plate 1d is substantially the same as the light reflecting plate 1a. That is, the light reflecting plate 1 d is provided with the piezoelectric element 5 and the LED light source 7 on different surfaces with respect to the micro foamed resin plate 3. Here, the outer surface (lower side in the drawing) of the micro-foamed resin plate 3 is the back surface, and the inner surface (upper side in the drawing) is the surface. Therefore, in the lighting device 10, the piezoelectric element 5 is disposed on the back surface of the micro foam resin plate 3, and the LED light source 7 is disposed on the surface of the micro foam resin plate 3.

  The micro-foamed resin plate 3 constituting the light reflecting plate 1d has an opening 25 provided in the upper part and a recess 23 formed downward from the opening 25. That is, the shape of the hollow portion 23 of the light reflecting plate 1 d is a curved shape as a whole, and the upper portion of the hollow portion 23 becomes the opening 25. The piezoelectric element 5 is disposed at the approximate center of the recess 23 of the micro foam resin plate 3, and the LED light source 7 is disposed at a position away from the piezoelectric element 5.

  The opening 25 is covered with the light transmission member 11. That is, the light from the LED light source 7 is extracted outside through the light transmitting member 11 from the opening 25.

  Here, examples of the material of the light transmitting member 11 include a transparent or translucent acrylic resin, a polyethylene terephthalate (PET) resin, a polycarbonate (PC) resin, glass, and a polyester resin sheet. Further, the light transmitting member 11 may be a transparent resin material or glass material to which a colored film is attached. For example, the colored film may be a transparent polyester film.

  Further, as a material of the light transmitting member 11, a translucent milky white acrylic plate can be used. Further, a light diffusing layer provided with a light reflecting function by attaching a prism sheet or the like having a minute uneven shape on the surface of a transparent resin may be provided on the light transmitting member 11. Further, as the light transmitting member 11, a molding member having a lens structure in which a large number of prism-like or convex lens-like protrusions that diffuse and transmit light are provided on the surface may be used.

  A substrate 15 is disposed in the vicinity of the edge of the light transmitting member 11. The board | substrate 15 is a control board which controls the LED light source 7 and the piezoelectric element 5, for example, is rigid boards, such as a glass epoxy board | substrate.

  A switch 13 is connected to the substrate 15 by a circuit on the substrate. The circuit on the substrate 15 and the switch 13 may be directly connected, or the substrate 15 and the terminal of the switch 13 may be connected by wiring. On the light transmission member 11, the operation part of the switch 13 is exposed. As the switch 13, a contact-type capacitance switch may be provided on the light transmission member 11.

  Further, a terminal 19 is connected to the substrate 15, and the terminal 19 passes through the vicinity of the end of the light transmission member 11 and is exposed to the outside. Further, the LED light source 7 and the piezoelectric element 5 are connected to the substrate 15 by wiring 17. By operating the switch 13, the LED light source 7 can be turned on / off and the piezoelectric element 5 can be turned on / off.

  In addition, it is desirable that at least a part of the wiring 17 that connects the LED light source 7 and the substrate 15 or the wiring 17 that connects the piezoelectric element 5 and the substrate 15 is arranged along the micro foam resin plate 3. By doing in this way, the influence by the shadow of the wiring 17 can be suppressed.

  Next, a method for extracting sound from the lighting device using the lighting device 10 will be described. As described above, the lighting device 10 can be used as a normal lighting device by turning on the LED light source 7.

  In addition, using the lighting device 10, for example, a voice signal or a music signal transmitted wirelessly is received from a portable information device (not shown) by a receiver (not shown). The received audio signal or music signal is amplified by an amplifier or an amplifier circuit (not shown). The piezoelectric element 5 can be vibrated by connecting the receiver, the amplifier or amplifier circuit, and the piezoelectric element 5 with the wiring 17. Thereby, the micro foamed resin plate 3 on which the piezoelectric element 5 is arranged can vibrate and take out voice or music.

  Note that wireless communication may not be used. For example, the information terminal and the amplifier or amplifier circuit may be connected by wiring. In this case, the audio signal or music signal transmitted from the information terminal is amplified by an amplifier or an amplifier circuit. By connecting the amplifier or amplifier circuit and the piezoelectric element 5 with the wiring 17, the piezoelectric element 5 may be vibrated, and the micro foamed resin plate 3 on which the piezoelectric element 5 is disposed may be acoustically vibrated to extract voice or music.

  In addition, when using a radio | wireless, BlueTooth (trademark) can be used, for example. BlueTooth (registered trademark) is one of short-range wireless communication technologies used for connection between devices in portable information devices. For example, if the distance between devices is within 10 m, it can be used even if there are obstacles such as walls. can do. A portable information device such as a smartphone and the lighting device 10 can be connected without using a cable, and large volumes of data such as music other than voice can be transmitted and received.

  As described above, according to the illuminating device 10 of the present embodiment, the LED light source 7 and the piezoelectric element 5 are directly disposed on the light reflecting plate 1d. Therefore, the support member for the LED light source 7 and the diaphragm for the piezoelectric element 5 are separated. It is not necessary to install with the body. For this reason, the number of parts can be suppressed and a small illuminating device can be obtained.

  Further, by using the micro foamed resin plate 3, it is lightweight and strong, so that it can cope with a complicated shape and can efficiently diffuse and reflect light. Therefore, light can be extracted efficiently and uniformly. In particular, since the light reflectance can be increased by using the micro-foamed resin plate 3 for the light reflecting plate 1d, the illuminance of the light taken out from the opening 25 is not dependent on the portion even if the number of times of light reflection is slightly different. It doesn't change much.

  In addition, since the micro foamed resin plate 3 has sufficient rigidity, it can sufficiently function as an acoustic vibration plate using the piezoelectric element 5. For this reason, music, voice, and the like can be generated from the lighting device 10.

  Here, the light from the LED light source 7 is extracted to the outside by being reflected on the surface of the micro foam resin plate 3. Therefore, when the micro-foamed resin plate 3 is vibrated by the piezoelectric element 5, the direction of the reflected light may change slightly. For example, when a reflection plate such as a mirror-finished metal plate is used, light is almost regularly reflected and diffuse reflection hardly occurs. In this case, when light is irradiated from a certain position and the reflecting plate is vibrated, the direction of reflected light of the light fluctuates due to the vibration, which causes light flickering.

  On the other hand, the micro-foamed resin plate 3 has a high diffuse reflectance of 90% or more, and the direction distribution of the reflected light with respect to the incident light is gentle compared to the above-described conventional reflector, and is almost independent of the direction. A constant reflected light can be obtained. For this reason, even if the reflecting plate is displaced by the vibration of the micro-foamed resin plate 3, the fluctuation of the direction of the reflected light is small and the flickering of the light can be suppressed. For this reason, the LED light source 7 and the piezoelectric element 5 can be directly arranged on the micro-foamed resin plate 3, and the apparatus can be reduced in size and weight.

  In addition, the illuminating device 10 of the present invention is particularly suitable for an illuminating device for indoor illumination, induction illumination, or illumination for automobiles, railway vehicles, and aircraft. For example, when it is used as a car indoor lamp (vehicle ceiling lighting), it can illuminate the interior of the room and can play music and voice from the lighting device. Also, by providing a recess in the light reflecting plate, the directivity of the sound from the speaker is strengthened, the sound pressure in a predetermined direction is increased, and the center of the irradiation area of the lighting device and the direction in which the sound pressure is high are substantially matched. Can do.

  Next, another embodiment of the first embodiment will be described for the lighting device. FIG.5 (b) is sectional drawing which shows the illuminating device 10a. In addition, in the following description, about the structure which show | plays the function similar to the illuminating device 10, the code | symbol same as FIGS. 1-5 (a) is attached | subjected, and the overlapping description in each embodiment is abbreviate | omitted.

  Although the illuminating device 10a is the structure substantially the same as the illuminating device 10, it differs by the point by which the light reflecting plate 1e is used. The light reflecting plate 1e has substantially the same shape as the light reflecting plate 1d. That is, the micro-foamed resin plate 3 constituting the light reflecting plate 1e has an opening 25 provided in the upper part and a recessed part 23 formed downward from the opening 25.

  In the light reflecting plate 1e, the piezoelectric element 5 and the LED light source 7 are provided on the same surface with respect to the micro-foamed resin plate 3. That is, both the piezoelectric element 5 and the LED light source 7 in the lighting device 10 a are arranged on the surface of the micro foamed resin plate 3. In addition, the piezoelectric element 5 is disposed substantially at the center of the hollow portion 23 of the micro-foamed resin plate 3, and the LED light source 7 is disposed at a position away from the piezoelectric element 5.

  According to another embodiment of the first embodiment, the same effect as that of the first embodiment can be obtained. As described above, the piezoelectric element 5 may be arranged at any position on the back surface of the micro foam resin plate 3 or at a position different from the LED light source 7 on the surface of the micro foam resin plate 3.

(Second Embodiment)
Next, a second embodiment of the lighting device will be described. Fig.6 (a) is sectional drawing which shows the illuminating device 10b. Although the illuminating device 10b is the structure substantially the same as the illuminating device 10, it differs by the point by which the light reflecting plate 1f is used. The light reflection plate 1f has substantially the same configuration as the light reflection plate 1d, but the shape of the recess 23 is different.

  The micro-foamed resin plate 3 constituting the light reflection plate 1 f has an opening 25 provided at the upper part and a recess 23 formed downward from the opening 25. The hollow portion 23 has a wall portion 24 formed downward substantially perpendicular to the light transmission member 11. In addition, a flat portion 26 is formed at a substantially central portion of the hollow portion 23.

  The LED light source 7 is disposed on the wall 24 on the surface of the micro foam resin plate 3. In addition, the piezoelectric element 5 is disposed on the back surface of the micro-foamed resin plate 3 and on the flat portion 26 at the approximate center of the recessed portion 23.

  According to the second embodiment, an effect similar to that of the first embodiment can be obtained. Thus, the shape of the hollow part 23 does not have to be a curved shape as a whole. For example, the hollow part 23 may have the wall part 24 and the central part may be flat. In addition, the shape of the hollow part 23 is not restricted to the illustrated example, For example, the shape formed by the curved surface part which the upper part opened, or the wall formed toward the downward direction substantially perpendicular | vertical with respect to the light transmissive member 11 The shape may be any one of a substantially inverted truncated pyramid shape, a substantially inverted truncated cone shape, or a substantially rectangular parallelepiped shape having an opening at the top.

  Next, another embodiment of the second embodiment will be described for the lighting device. FIG.6 (b) is sectional drawing which shows the illuminating device 10c. Although the illuminating device 10c is the structure substantially the same as the illuminating device 10b, it differs by the point by which the light reflecting plate 1g is used. The light reflecting plate 1g has substantially the same configuration as the light reflecting plate 1f, but the arrangement of the piezoelectric elements 5 is different.

  In the light reflecting plate 1g, the piezoelectric element 5 and the LED light source 7 are provided on the same surface with respect to the micro foamed resin plate 3. That is, both the piezoelectric element 5 and the LED light source 7 in the lighting device 10 c are arranged on the surface of the micro foamed resin plate 3. The piezoelectric element 5 is disposed on the flat portion 26 at the substantially center of the hollow portion 23 of the micro-foamed resin plate 3, and the LED light source 7 is disposed on the wall portion 24 away from the piezoelectric element 5.

  According to the second alternative embodiment, the same effect as that of the first embodiment can be obtained. Thus, regardless of the shape of the light reflecting plate, the piezoelectric element 5 is either at an arbitrary position on the back surface of the micro-foamed resin plate 3 or a position different from the LED light source 7 on the surface of the micro-foamed resin plate 3. Should just be arranged.

(Third embodiment)
Next, 3rd Embodiment is described about an illuminating device. 7 is a perspective view showing the illumination device 10d, FIG. 8A is a cross-sectional view taken along the line C-C in FIG. 7, and FIG. 8B is a cross-sectional view taken along the line D-D in FIG. The illumination device 10d has substantially the same configuration as the illumination device 10, but differs in that a pair of micro foamed resin plates 3 are provided.

  The illuminating device 10d includes an outer reflecting plate 21a made of micro-foamed resin and an inner reflecting plate 21b made of micro-foamed resin. The inner reflection plate 21b is disposed inside the outer reflection plate 21a. That is, the illumination device 10d includes a pair of micro foam resin plates 3.

  In the present embodiment, the light reflecting plate 1d described above is used as the outer reflecting plate 21a. That is, the micro-foamed resin plate 3 constituting the outer reflection plate 21a has an opening 25 provided in the upper portion and a recess 23 formed downward from the opening 25. Similarly, the micro-foamed resin plate 3 constituting the inner reflection plate 21b has an opening 25a provided in the upper part and a recess 23a formed downward from the opening 25a.

  That is, the shape of the recessed portions 23 and 23a of the outer reflecting plate 21a and the inner reflecting plate 21b is a curved shape as a whole, and the upper portions of the recessed portions 23 and 23a become the opening portions 25 and 25a, respectively. In addition, the opposing surfaces of the recesses 23 and 23a of the outer reflecting plate 21a and the inner reflecting plate 21b face each other with a predetermined distance therebetween.

  The inner reflecting plate 21b and the outer reflecting plate 21a can be integrally formed by micro-foaming resin sheet by vacuum molding or match mold molding. Further, the inner reflection plate 21b and the outer reflection plate 21a may be formed separately and the inner reflection plate 21b and the outer reflection plate 21a may be overlapped and connected.

  The piezoelectric element 5 is disposed substantially at the center of the recess 23 of the outer reflecting plate 21a. Moreover, the LED light source 7a is arrange | positioned as the 1st LED light source on the surface of the hollow part 23a of the inner side reflecting plate 21b. Moreover, the LED light source 7 is arrange | positioned as a 2nd LED light source on the surface of the hollow part 23 of the outer side reflecting plate 21a. That is, the LED light source 7 in the light reflection plate 1 d is arranged at a position away from the piezoelectric element 5. The arrangement of the piezoelectric element 5 is not limited to the illustrated example, and the piezoelectric element 5 may be arranged at an arbitrary position on the back surface of the recessed portion 23 of the outer reflecting plate 21a, or as described above, It may be arranged at a position different from the LED light source 7 on the surface of the recess 23 of the reflecting plate 21a. At this time, it is desirable that the piezoelectric element 5 is disposed at substantially the center of the outer reflecting plate 21a, and the LED light source 7 is disposed at other positions.

  Even in this case, at least a part of the wiring 17 that connects the LED light sources 7 and 7 a and the substrate 15 or the wiring 17 that connects the piezoelectric element 5 and the substrate 15 extends along any one of the micro foamed resin plates 3. It is desirable to be arranged.

  The openings 25 and 25a of the outer reflection plate 21a and the inner reflection plate 21b are covered with the light transmission member 11. That is, the light from the LED light source 7a is taken out from the opening 25a of the inner reflection plate 21b, and the light from the LED light source 7 is around the opening 25a of the inner reflection plate 21b and the outer reflection plate 21b and the outer side. It is taken out from the opening 25 between the reflecting plates 21a. Here, in the illumination device 10d, the openings 25 and 25a are formed in the same direction. For this reason, the emission direction of light from the opening 25 and the emission direction of light from the opening 25a are the same direction.

  Here, the LED light source 7a may be a white or daylight LED light source, and the LED light source 7 may be a colored LED light source. By doing in this way, the light from LED light source 7a can be utilized as practical illumination, and the light from LED light source 7 can be utilized as illumination for decoration, for example.

  The switch 13 can switch on / off the LED light source 7 of the outer reflecting plate 21a and the LED light source 7a of the inner reflecting plate 21b. That is, by switching the switch 13, light can be extracted from either the opening 25 or the opening 25a.

  Note that only one of the LED light sources 7 and 7a may be turned on by the switch 13, and both the pair of LED light sources 7 and 7a may be turned off or turned on simultaneously. The switch 13 can be used to switch on and off the piezoelectric element 5 of the piezoelectric element 5.

  Here, when the LED light source 7a is turned on, the light from the LED light source 7a repeats diffuse reflection on the surface side of the inner reflection plate 21b and is emitted from the opening 25a. That is, the light from the LED light source 7 a is diffused and reflected within the hollow portion 23 a of the inner reflection plate 21 b and is emitted to the outside through the light transmission member 11.

  On the other hand, when the switch 13 is switched and the LED light source 7 is turned on, the light from the LED light source 7 repeats diffuse reflection on the back surface side of the inner reflecting plate 21b and the front surface side of the outer reflecting plate 21a, thereby opening the opening portion. 25. That is, the light from the LED light source 7 is diffused and reflected many times between the recess 23 of the outer reflection plate 21 a and the recess 23 a of the inner reflection plate 21 b, and is emitted to the outside through the light transmission member 11.

  Here, like the lighting device 10d, the space in which each light of the LED light sources 7 and 7a is diffusely reflected has a laminated structure, whereby the lighting device can be reduced in size and weight. Further, the distance (diffuse reflection section) from the LED light source 7 to the opening 25 can be increased. For this reason, more uniform light can be extracted.

  According to the third embodiment, the same effect as that of the first embodiment can be obtained. Further, since the inner reflecting plate 21b and the outer reflecting plate 21a are separated from each other and overlapped, it is possible to form independent spaces on the front surface side and the back surface side of the inner reflecting plate 21b. That is, the inner reflection plate 21b can function both as a reflection plate on the front surface and the back surface.

  Moreover, since each LED light source 7 and 7a can be switched and used, it can function as an illuminating device for irradiating each light to a different use or site | part.

  In the illumination device 10d, the outer reflection plate 21a functions as a diaphragm by the piezoelectric element 5.

(Fourth embodiment)
Next, 4th Embodiment is described about an illuminating device. Fig.9 (a) is sectional drawing of the illuminating device 10e. The illumination device 10e has substantially the same configuration as the illumination device 10d, but the arrangement of the piezoelectric elements 5 is different.

  Similarly to the illumination device 10d, the illumination device 10e uses the light reflection plate 1d, but the light reflection plate 1d is used as the inner reflection plate 21b. That is, the micro-foamed resin plate 3 constituting the inner reflection plate 21b has an opening 25 provided in the upper part and a recess 23 formed downward from the opening 25. Similarly, the micro-foamed resin plate 3 constituting the outer reflection plate 21a has an opening 25a provided in the upper part and a recess 23a formed downward from the opening 25a.

  Even in this case, the shape of each of the recessed portions 23 and 23a of the outer reflection plate 21a and the inner reflection plate 21b is a curved shape as a whole. Further, the recesses 23 and 23a of the outer reflection plate 21a and the inner reflection plate 21b face each other with a predetermined distance therebetween. In the illumination device 10e, the recess 23a is disposed outside the recess 23. For this reason, the opening part 25a is formed in the outer periphery of the opening part 25 of the light reflection board 1d.

  The piezoelectric element 5 is disposed on the back surface of the inner reflection plate 21 b and substantially at the center of the recess 23. Moreover, the LED light source 7 is arrange | positioned on the surface of the inner side reflecting plate 21b. Moreover, the LED light source 7a is arrange | positioned on the surface of the outer side reflecting plate 21a. Therefore, the LED light source 7 in the light reflection plate 1 e is disposed at a position away from the piezoelectric element 5.

  The openings 25 and 25a of the outer reflection plate 21a and the inner reflection plate 21b are covered with the light transmission member 11. That is, the light from the LED light source 7 is extracted from the opening 25 of the inner reflection plate 21b, and the light from the LED light source 7a is around the opening 25 of the inner reflection plate 21b, and the outer reflection plate 21b and the outer reflection plate 21b. It is taken out from the opening 25a between the reflecting plates 21a. Even in this case, since the openings 25 and 25a are formed in the same direction, the light emission direction from the opening 25 and the light emission direction from the opening 25a are the same direction.

  According to the fourth embodiment, the same effect as that of the third embodiment can be obtained. Thus, the light reflecting plate 1d may be used as the outer reflecting plate 21a or the inner reflecting plate 21b. That is, the piezoelectric element 5 should just be arrange | positioned in either the outer side reflecting plate 21a or the inner side reflecting plate 21b.

  Next, another embodiment of the fourth embodiment will be described for the lighting device. FIG. 9B is a cross-sectional view of the lighting device 10f. The illuminating device 10f has substantially the same configuration as the illuminating device 10d, but the arrangement of the LED light sources is different.

  In the illumination device 10f, the light reflecting plate 1h is used as the outer reflecting plate 21a. The light reflecting plate 1h has substantially the same shape as the light reflecting plate 1d, but differs in that the LED light source 7 is not provided.

  The micro-foamed resin plate 3 constituting the outer reflection plate 21a has an opening 25 provided in the upper part and a recess 23 formed downward from the opening 25. Similarly, the micro-foamed resin plate 3 constituting the inner reflection plate 21b has an opening 25a provided in the upper part and a recess 23a formed downward from the opening 25a.

  Also in the illuminating device 10f, the shape of the recesses 23 and 23a of the outer reflection plate 21a and the inner reflection plate 21b is entirely curved, and the upper portions of the recesses 23 and 23a are the openings 25 and 25a, respectively. It becomes. Further, the recesses 23 and 23a of the outer reflection plate 21a and the inner reflection plate 21b face each other with a predetermined distance therebetween.

  The piezoelectric element 5 is disposed on the back surface of the outer reflecting plate 21 a and substantially at the center of the recess 23. The LED light source 7a is disposed on the surface of the inner reflection plate 21b. Moreover, the LED light source 7b is arrange | positioned at the back surface of the inner side reflecting plate 21b. That is, the LED light sources 7 a and 7 b are both disposed on the inner reflecting plate 21 b, and the LED light sources 7 a and 7 b in the light reflecting plate 1 d are disposed on the micro foam resin plate 3 different from the piezoelectric element 5. The LED light sources 7a and 7b may be arranged at the same position in the approximate center of the inner reflection plate 21b, or may be arranged at different positions on the front surface and the back surface.

  According to the fourth alternative embodiment, the same effect as that of the third embodiment can be obtained. Further, by disposing the LED light sources 7a and 7b on the front and back sides of the inner reflection plate 21b without arranging the LED light sources on the outer reflection plate 21a on which the piezoelectric element 5 is arranged, the LED light sources 7a and 7b by the piezoelectric element 5 are provided. The influence of can be suppressed. Moreover, since the outer reflecting plate 21a can be reduced in weight, the outer reflecting plate 21a can be efficiently acoustically vibrated by the piezoelectric element 5.

(Fifth embodiment)
Next, 5th Embodiment is described about an illuminating device. 10 is a perspective view showing the lighting device 10g, FIG. 11A is a cross-sectional view taken along line EE in FIG. 10, and FIG. 11B is a cross-sectional view taken along line FF in FIG. The illumination device 10g has substantially the same configuration as the illumination device 10d, but the shape of the micro foam resin plate 3 is different.

  The light reflecting plate 1i is used as the outer reflecting plate 21a. The micro-foamed resin plate 3 constituting the light reflecting plate 1i has an opening 25 provided in the upper portion and a recess 23 formed downward from the opening 25. The hollow portion 23 has a wall portion 24 formed downward substantially perpendicular to the light transmission member 11. Further, the outer reflection plate 21 a has a curved shape upward from the wall portion 24 of the recess portion 23.

  Similarly, the micro-foamed resin plate 3 constituting the inner reflection plate 21b has an opening 25a provided in the upper part and a recess 23a formed downward from the opening 25a. The hollow portion 23 a has a wall portion 24 a that is formed downward substantially perpendicular to the light transmission member 11. The inner reflection plate 21b has a curved shape from the wall portion 24a of the recess portion 23a upward.

  The LED light source 7 is disposed on the wall 24 on the surface of the outer reflection plate 21a. Further, the piezoelectric element 5 is arranged on the back surface of the outer reflecting plate 21 a and at the curved portion at the approximate center of the recessed portion 23. The LED light source 7a is disposed on the wall 24a, which is the surface of the inner reflection plate 21b.

  Here, the edge part of the opening part 25a of the inner side reflecting plate 21b protrudes outward in a flange shape. Therefore, the upper part of the opening 25 between the inner reflecting plate 21b and the outer reflecting plate 21a is covered with the edge of the inner reflecting plate 21b. On the other hand, since the edge of the outer reflecting plate 21a is positioned below the edge of the inner reflecting plate 21b, the opening 25 formed above the recess 23 of the outer reflecting plate 21a is on the side of the lighting device 10g. It will open toward the direction.

  Even in this case, both of the openings 25 and 25a are covered with the light transmission member 11 bent according to the opening direction of the openings 25 and 25a. Therefore, the light from the LED light source 7a is extracted from the opening 25a of the inner reflection plate 21b, and the light from the LED light source 7 is around the opening 25a of the inner reflection plate 21b, and the outer reflection plate 21b and the outer reflection plate 21b. It is taken out from the opening 25 between the reflecting plates 21a. Here, in the lighting device 10g, the openings 25 and 25a are formed in different directions (directions substantially perpendicular to each other). For this reason, the light emission direction from the opening 25 is different from the light emission direction from the opening 25a.

  According to the fifth embodiment, the same effect as in the fourth embodiment can be obtained. Thus, the shape of the hollow parts 23 and 23a does not need to be the shape which the whole curved, and may have the wall parts 24 and 24a, for example. Moreover, the light emission directions from the respective openings 25 and 25a may not be the same direction.

(Sixth embodiment)
Next, 6th Embodiment is described about an illuminating device. Fig.12 (a) is sectional drawing of the illuminating device 10h. The lighting device 10h has substantially the same configuration as the lighting device 10g, but the arrangement of the piezoelectric elements 5 is different.

  Similarly to the illumination device 10g, the illumination device 10h uses the light reflection plate 1i, but the light reflection plate 1i is used as the inner reflection plate 21b. That is, the micro-foamed resin plate 3 constituting the inner reflection plate 21b has an opening 25 provided in the upper part and a recess 23 formed downward from the opening 25. Similarly, the micro-foamed resin plate 3 constituting the outer reflection plate 21a has an opening 25a provided in the upper part and a recess 23a formed downward from the opening 25a.

  Even in this case, the shape of each of the recessed portions 23 and 23a of the outer reflecting plate 21a and the inner reflecting plate 21b has the wall portions 24 and 24a and the remaining portion is curved. Further, the recesses 23 and 23a of the outer reflection plate 21a and the inner reflection plate 21b face each other with a predetermined distance therebetween. In the lighting device 10 h, the recess 23 a is disposed outside the recess 23. For this reason, the opening part 25a is formed in the outer periphery of the opening part 25 of the light reflection board 1d.

  Further, the piezoelectric element 5 is disposed on the back surface of the inner reflection plate 21 b and substantially at the center of the recess 23. Moreover, the LED light source 7 is arrange | positioned on the surface of the wall part 24 of the inner side reflecting plate 21b. Moreover, the LED light source 7a is arrange | positioned on the surface of the wall part 24a of the outer side reflecting plate 21a.

  Under the present circumstances, the edge of the opening part 25 of the inner side reflecting plate 21b protrudes outward in the shape of a flange. Therefore, as described above, the opening 25a formed above the recess 23a of the outer reflecting plate 21a opens toward the side of the lighting device 10g. Therefore, the light emission direction from the opening 25 is different from the light emission direction from the opening 25a.

  According to the sixth embodiment, the same effect as in the fifth embodiment can be obtained. Thus, the light reflecting plate 1i may be used as the outer reflecting plate 21a or the inner reflecting plate 21b. That is, the piezoelectric element 5 should just be arrange | positioned in either the outer side reflecting plate 21a or the inner side reflecting plate 21b.

  Next, another embodiment of the sixth embodiment will be described for the lighting device. FIG. 12B is a cross-sectional view of the illumination device 10i. Although the illuminating device 10i is the structure substantially the same as the illuminating device 10g, the shape of the micro foaming resin board 3 and arrangement | positioning of an LED light source differ.

  In the illumination device 10i, the light reflecting plate 1j is used as the outer reflecting plate 21a. The micro-foamed resin plate 3 constituting the light reflecting plate 1j has an opening 25 provided in the upper part and a recess 23 formed downward from the opening 25. The hollow portion 23 has a wall portion 24 formed downward substantially perpendicular to the light transmission member 11. In addition, a flat portion 26 is formed at a substantially central portion of the hollow portion 23. Parts other than the wall part 24 and the flat part 26 are curved surfaces.

  Similarly, the micro-foamed resin plate 3 constituting the inner reflection plate 21b has an opening 25a provided in the upper part and a recess 23a formed downward from the opening 25a. The hollow portion 23 a has a wall portion 24 a that is formed downward substantially perpendicular to the light transmission member 11. In addition, a flat portion 26 is formed at a substantially central portion of the hollow portion 23a. Parts other than the wall part 24a and the flat part 26 become curved surfaces.

  That is, the recesses 23 and 23a of the inner reflection plate 21b and the outer reflection plate 21a are wall portions 24 and 24a formed substantially vertically downward with respect to the light transmission member 11, and curved surfaces opened upward. And a shape formed by the portion. In addition, the hollow part 23a of the inner side reflecting plate 21b and the hollow part 23 of the outer side reflecting plate 21a are substantially similar shapes.

  In addition, the hollow parts 23 and 23a may consist of either the substantially inverted truncated pyramid shape in which the wall parts 24 and 24a were formed and the upper part opened, the substantially inverted truncated cone shape, or the substantially rectangular parallelepiped shape.

  The piezoelectric element 5 is disposed on the back surface of the outer reflecting plate 21 a and on the flat portion 26 at the approximate center of the recessed portion 23. The LED light source 7b is disposed on the surface of the inner reflection plate 21b and substantially at the center of the recess 23a. The LED light source 7a is disposed on the back surface of the inner reflection plate 21b and substantially at the center of the recess 23a. That is, no LED light source is arranged on the light reflection plate 1i.

  The LED light sources 7a and 7b may be arranged at the same position in the approximate center of the inner reflection plate 21b, or may be arranged at different positions on the front surface and the back surface. The piezoelectric element 5 may be disposed on the inner reflection plate 21b. That is, the piezoelectric element 5 should just be arrange | positioned in the flat part 26 of the approximate center of the inner side reflecting plate 21b or the outer side reflecting plate 21a.

  According to the sixth alternative embodiment, the same effect as in the fifth embodiment can be obtained. Thus, the shape of the hollow parts 23 and 23a does not need to be a curved shape as a whole. For example, the hollow parts 23 and 23a having the wall parts 24 and 24a and the flat central part may be used.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

  For example, it goes without saying that the embodiments described above can be combined with each other.

1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1i, 1j ......... light reflecting plate 3 ......... micro foamed resin plate 5 ......... piezoelectric elements 7, 7a, 7b ......... LED Light source 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 10i ......... lighting device 11 ......... light transmission member 13 ......... switch 15 ......... substrate 17 ......... wiring 19 ... ... terminal 21a ......... outer reflector 21b ......... inner reflector 23, 23a ......... depression 24, 24a ......... wall 25, 25a ... ... opening 26 ... ... flat part

Claims (22)

A micro-foamed resin plate having a diffuse reflectance of 90% with respect to an aluminum oxide standard plate in a visible light region having a wavelength of 450 nm to 650 nm;
And a piezoelectric element provided as a vibration actuator on the surface of the micro-foamed resin plate.   2. The light reflecting plate according to claim 1, wherein an LED light source is disposed at a position different from at least one of the piezoelectric elements on the front surface or the back surface of the micro foamed resin plate.   The light reflecting plate according to claim 1, wherein the micro-foamed resin plate has a recess, and the piezoelectric element is provided in the recess.   The light reflecting plate according to claim 2, wherein the micro-foamed resin plate has a recess, and the piezoelectric element is provided in the recess.   The concave portion is formed by a curved portion with an upper opening, or a wall and a shape formed by a curved portion with an upper opening, a substantially inverted truncated pyramid shape with an upper opening, a substantially inverted truncated cone shape, or The light reflection plate according to claim 3, wherein the light reflection plate has any one of a substantially rectangular parallelepiped shape.   The light reflecting plate according to any one of claims 3 to 5, wherein the foamed resin plate is at least one of PET resin, PC resin, acrylic resin, and flame-retardant acrylic resin.   An illumination device comprising a light reflecting plate that also serves as the acoustic diaphragm according to claim 3.   An illuminating device comprising a light reflecting plate that also serves as the acoustic diaphragm according to claim 4. The micro-foamed resin plate has an opening provided in an upper portion and the depression formed from the opening downward.
The LED light source is disposed on the surface of the recess of the micro foam resin plate,
The opening is covered with a light transmission member, and light is extracted from the opening,
The lighting device according to claim 8, wherein the piezoelectric element is disposed on a back surface of the recess portion of the micro foam resin plate or a surface of the recess portion of the micro foam resin plate. The hollow portion has a wall portion,
The LED light source is provided on the wall,
The lighting device according to claim 9, wherein the piezoelectric element is disposed on a back surface of the micro-foamed resin plate at a substantially flat portion at a center of the hollow portion.   The shape of the hollow portion is a shape formed by a curved surface portion opened upward, or a wall portion formed downward substantially perpendicularly to the light transmitting member, and a curved surface portion opened upward 11. The lighting device according to claim 9, wherein the lighting device has any one of a formed shape, a substantially inverted truncated pyramid shape, a substantially inverted truncated cone shape, and a substantially rectangular parallelepiped shape. An outer reflector made of a micro foam resin having a diffuse reflectance of 90% with respect to the aluminum oxide standard plate in a visible light region having a wavelength of 450 nm to 650 nm;
Comprising a pair of micro-foamed resin plates arranged inside the outer reflector, and an inner reflector made of micro-foamed resin,
The outer reflecting plate and the inner reflecting plate are each formed with an opening provided in the upper portion and a recess portion downward from the opening,
The recesses of the inner reflector and the outer reflector are spaced apart from each other,
A 1st LED light source is arrange | positioned at the surface of the said hollow part of the said inner side reflecting plate, and a 2nd LED light source is arrange | positioned at the surface of the said hollow part of the said outer side reflecting plate, or the back surface of the said hollow part of the said inner side reflecting plate. And
Light is extracted from each of the openings of the inner reflection plate and the openings of the inner reflection plate between the inner reflection plate and the outer reflection plate, and the inner reflection plate and the inner reflection plate. Each of the openings of the outer reflector is covered with a light transmissive member,
A lighting device, wherein a piezoelectric element is disposed on a back surface of the inner reflecting plate or a front surface of the outer reflecting plate and at a position different from the second LED light source or on the back surface of the outer reflecting plate. The first LED light source is disposed on the surface of the inner reflector, the second LED light source is disposed on the back surface of the inner reflector,
The lighting device according to claim 12, wherein the piezoelectric element is disposed on a front surface or a back surface of the outer reflecting plate. The opposing surfaces of the recesses of the inner reflector and the outer reflector face each other with a predetermined distance therebetween,
The lighting device according to claim 12 or 13, wherein the piezoelectric element is arranged in a flat portion at a substantially center of the inner reflecting plate or the outer reflecting plate.   Each of the recessed portions of the inner reflector and the outer reflector has a shape formed by a curved surface portion opened upward, or a wall portion formed substantially vertically downward with respect to the light transmitting member. And having a shape formed by a curved surface portion having an upper opening, a substantially inverted truncated pyramid shape having an upper opening, a substantially inverted truncated cone shape, or a substantially rectangular parallelepiped shape, and the recess portion of the inner reflecting plate The illumination device according to any one of claims 12 to 14, wherein the hollow portion of the outer reflection plate has a substantially similar shape.   The lighting device according to any one of claims 12 to 15, wherein the first LED light source is a white or daylight LED light source, and the second LED light source is a colored LED light source. .   At least a part of the wiring of the LED light source or the piezoelectric element, or at least a part of the wiring of the first LED light source, the second LED light source or the piezoelectric element is arranged along the micro foamed resin plate. The illumination device according to any one of claims 9 to 16, wherein   The thickness of the portion of the micro foamed resin plate where the piezoelectric element is attached and the vicinity thereof are formed thinner than the thickness of the outer peripheral portion of the micro foam resin plate. The lighting device according to claim 17.   The lighting device according to any one of claims 9 to 18, wherein a thickness of the hollow portion of the micro-foamed resin plate is in a range of 0.3 mm to 0.8 mm.   The lighting device according to any one of claims 9 to 19, wherein the lighting device is a lighting device for indoor lighting, induction lighting, or lighting of an automobile, a railway vehicle, and an aircraft.   21. A voice signal or a music signal transmitted wirelessly from a portable information device is received by a receiver using the lighting device according to claim 9, and the voice signal or the music signal is amplified or amplified. The piezoelectric element is vibrated by connecting the receiver, the amplifier or the amplifier circuit and the piezoelectric element with wiring, and the micro foam resin plate on which the piezoelectric element is arranged is acoustically vibrated. A method for extracting sound from a lighting device, characterized by extracting voice or music. 21. The lighting apparatus according to claim 9, wherein an information terminal and an amplifier or an amplifier circuit are connected by wiring, and an audio signal or a music signal transmitted from the information terminal is connected to the amplifier or the amplifier. Amplifying with a circuit, and connecting the amplifier or the amplifier circuit and the piezoelectric element with wiring, the piezoelectric element is vibrated, and the micro foamed resin plate on which the piezoelectric element is arranged is acoustically vibrated to generate sound or A method for extracting sound from a lighting device, characterized in that music is extracted.

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