WO2023238959A1

WO2023238959A1 - Composite structure of illumination device and wireless communication device, placement method for illumination device and wireless communication device, and illumination device-equipped wireless communication device placed by said placement method

Info

Publication number: WO2023238959A1
Application number: PCT/JP2023/021801
Authority: WO
Inventors: 俊司山本; 泰樹木村; 功一河井; 英史小澤; 聡小澤
Original assignee: 古河電気工業株式会社
Priority date: 2022-06-10
Filing date: 2023-06-12
Publication date: 2023-12-14

Abstract

This composite structure 1 is a structure in which an illumination device 3 and a wireless communication device 17 have been integrated and composited. A light transmission member 7 is placed on the opening side of a micro-foamed resin sheet 15 having a depression-like recessed shape. A light guide space 19 is formed between the molded micro-foamed resin sheet 15 and the light transmission member 7. An LED light source 13 is placed on a substrate 11. A wireless communication device 17 is placed on the back surface side of the micro-foamed resin sheet 15 which is the side opposite to the light guide space 19. In the composite structure 1, the micro-foamed resin sheet 15 placed in front of the wireless communication device 17 functions as a portion of a housing of the illumination device 3, and is placed so as to contact a radio wave-emitting surface of the wireless communication device 17. As a result, it is possible to obtain a composite structure of an illumination device and a wireless communication device that not only excels in light diffusion reflectance properties and low radio wave transmission loss, but also excels in radio wave scattering loss.

Description

A composite structure of a lighting device and a wireless communication device, a method of arranging the lighting device and a wireless communication device, and a wireless communication device with a lighting device arranged using the arrangement method

The present invention relates to a composite structure in which an LED lighting device and a wireless communication device are integrated, a method of arranging the lighting device and the wireless communication device, and a wireless communication device with a lighting device arranged using the arrangement method.

For example, with the expansion of 5G services and the increasing sophistication of information and communications needs, it has become necessary to deploy large numbers of small cell base stations not only outdoors but also in various locations, including indoors. Therefore, there is a need for a wireless communication device that is small and low cost.

Conventional wireless communication devices are often installed, for example, on the roof or wall of a building. However, in order to install a large number of wireless communication devices, there are concerns about securing an installation location and increasing costs due to installation work. Therefore, in order to diversify wireless communication devices by arranging a large number of them indoors and outdoors, for example, combining them with lighting devices is being considered.

For example, Patent Document 1 discloses a base station device in which a base station unit, a guide light unit, and a common power supply unit are housed and integrated in a housing. The base station device of Patent Document 1 includes a base station unit that wirelessly connects with a mobile terminal and relays communication with a partner device of the mobile terminal, and a guide light unit that receives power supply and performs a predetermined operation. It has a common power supply unit that supplies power to the base station unit and the guide light unit, and a casing that is fixedly installed indoors or outdoors.

In the case of the base station device of Patent Document 1, a light emitting panel section and a resin display panel section are arranged as a lighting device in front of an electrical equipment unit. This light emitting panel has a light guide plate with an LED light source arranged thereon or a planar EL element arranged thereon, and a lighting device is arranged inside the same housing in front of the wireless communication device. According to Patent Document 1, it is possible to provide a base station device that is small, can be manufactured at low cost, can avoid radio wave interference, and can operate even in the event of a disaster.

Further, Patent Document 2 proposes a bus stop sign safety system that provides a bus stop sign equipped with a multipurpose function as a two-way communication device for familiar information. In the bus stop sign safety system disclosed in Patent Document 2, a bidirectional communication function is installed at a bus stop, adding a display device for familiar information and advertisements using text and images. Furthermore, the bus stop sign safety system disclosed in Patent Document 2 is equipped with solar cells and batteries, and can provide various information such as emergency disaster information notification via wireless LAN even in the event of a power outage in the event of a disaster.

As described above, according to the bus stop sign safety system of Patent Document 2, various advisories and warnings such as disaster information, local government public relations, emergency earthquake early warnings, news, weather information, heavy rain information, pollen information, and wave warnings, or bicycle and horse racing It is possible to display and transmit various types of latest information such as breaking news on public race facilities such as boat races, information on events and information in the surrounding area, and other gourmet information for housewives, as well as advertisements. Moreover, the bus stop sign safety system of Patent Document 2 can also be equipped with communication means such as an emergency red revolving lamp, a siren, and a speaker, and it is possible to construct a network information system using the bus stop sign.

In addition, Patent Document 3 describes a self-contained lighting system that generates all the electricity it consumes in-house using renewable energy, supplies the generated electricity to light and drive equipment, and does not emit _CO2 . A device and a wireless communication device are proposed.

In the private power generation system of Patent Document 3, electricity generated by a solar power generation device placed on the back surface of a liquid crystal display device is stored in a power storage device integrated layer or a secondary battery. Furthermore, using the stored power, the 5G radio waves received by the small base station can be amplified and transmitted from the 5G base station.

Conventionally, various lighting fixtures that brightly illuminate internally illuminated signboard surfaces, externally illuminated signboard surfaces, and indoor spaces of stores are supplied with commercial electricity and emit light energy that is considered to be glare light pollution. , a large amount of carbon dioxide (CO ₂ ) is emitted and contributes to global warming, but this can be suppressed according to the system of a lighting device and a wireless communication device disclosed in Patent Document 3.

Additionally, Patent Document 4 proposes an illuminated device-built-in antenna in which the device-built-in antenna is arranged on an antenna substrate. For example, it can be applied to building signs, convenience stores, drug stores, fixed parking lots, stations, post offices, etc., as well as wall-mounted signs, protruding signs, outdoor signs, stand signs, pole signs, etc. Signboards with built-in device antennas have been proposed.

The signboard of Patent Document 4 includes a horizontally long rectangular substrate, and on the surface of the substrate, a plurality of light emitting elements are provided in two rows approximately parallel to the long sides of the substrate at predetermined intervals from the center line. A device built-in antenna for communication is arranged approximately in the center of the substrate, and an LED light emitting element as a lighting device and a device built-in antenna are arranged on the same substrate at different positions where they do not interfere with each other.

In Patent Document 4, a switching means switches between direct connection and connection via a delay line. Since the phase of the feeding signal supplied to the first to fourth elements is determined in accordance with the switching of the switching means, the direction of the antenna beam of the device built-in antenna is determined by the sheet. That is, by bonding a predetermined sheet to the antenna substrate, the direction of the antenna beam can be set.

Further, Patent Document 5 proposes a position measurement system that uses a visible light communication system and can be easily put into practical use. The position measurement system of Patent Document 5 can measure the current position of a vehicle using a visible light communication beacon that transmits position information as a visible light signal and image information captured by one camera.

The visible light communication beacon in Patent Document 5 consists of a road lighting lamp and a visible light communication device provided on a road lighting pole. The vehicle has a vehicle position measuring device that is equipped with one camera and that demodulates the position information of the visible light communication beacon from the visible light signal to calculate the current position. In Patent Document 5, an outdoor road light has both a lighting device and a communication device, but the lighting device and the communication device are provided at different positions.

Japanese Patent Application Publication No. 2015-226201 Japanese Patent Application Publication No. 2010-102279 JP 2021-35318 Publication JP 2021-158492 Publication Japanese Patent Application Publication No. 2009-36571

However, with the conventional structure, there is a risk that the radio waves for wireless communication may be obstructed by the lighting device. For example, in general, absorption when radio waves are transmitted through a substance tends to increase as the dielectric constant of the substance increases. However, substrates used in lighting devices usually have a high relative permittivity, and when radio waves are transmitted through the substrate, they may be absorbed, resulting in a large transmission loss.

Additionally, a reflector is usually used to make the light extracted from the lighting device uniform. However, for example, a reflective plate made of metal has a high dielectric constant as described above, and there is a possibility that the transmission loss of radio waves becomes large. However, if the reflector is not properly placed, it will cause uneven brightness due to direct light from the light source.

On the other hand, as in Patent Document 5, if the lighting device and the wireless communication device are placed in different positions, it is possible to create a layout in which the radio waves from the wireless communication device are not affected by the lighting device. . However, in this case, it is difficult to downsize the device because the lighting device and the wireless communication device need to be placed separately.

The present invention has been made in view of such problems, and provides a composite structure of a lighting device and a wireless communication device, and a lighting device that can extract light of uniform brightness with little loss of radio waves from a wireless communication device. An object of the present invention is to provide a method for arranging a wireless communication device, and a wireless communication device with a lighting device arranged using the method.

In order to achieve the above-mentioned object, the present invention provides a composite structure of a lighting device and a wireless communication device, which are arranged in front of a wireless communication device, using a micro-foamed resin sheet, the lighting device having an LED light source. and a substrate supporting the LED light source, a light transmitting member, a frame member supporting an outer peripheral portion of the light transmitting member, and a light diffusing and reflecting microfoamed resin sheet, and supported by the frame member. By arranging the micro-foamed resin sheet having a concave cross-sectional shape behind the light-transmissive member, a light-guiding space is created between the light-transmissive member and the micro-foamed resin sheet. is formed, and the light-emitting surface of the LED light source is opposed to the micro-foamed resin sheet, so that the light emitted from the light-emitting surface of the LED light source is reflected by the micro-foamed resin sheet, and the light-transmitting member The wireless communication device is placed facing the opposite direction, the wireless communication device is placed on the back side of the light reflecting surface of the micro foam resin sheet, and the micro foam resin sheet placed in front of the wireless communication device is placed on the back side of the light reflecting surface of the micro foam resin sheet, and the micro foam resin sheet is placed in front of the wireless communication device. The micro-foamed resin sheet is placed in contact with the radio wave emitting surface of the wireless communication device as part of the casing of the wireless communication device, or is placed at a predetermined distance from the radio wave emitting surface of the wireless communication device, and the micro foam resin sheet This is a composite structure of a lighting device and a wireless communication device, characterized in that the material is made of a material that has excellent diffuse reflection properties, has a lower relative permittivity than the substrate and the light transmitting member, and has excellent radio wave transmittance. Here, it is preferable that the substrate is formed at a necessary position on the light guide space side of the frame member, on the light guide space side of the outer periphery of the light transmitting member, or formed on the light guide space side spanning both. .

Only the light transmitting member and the micro foam resin sheet are arranged in a central part of the lighting device corresponding to a front radio wave emitting surface of the wireless communication device so as not to obstruct transmission of radio waves from the wireless communication device. and the LED light source, the board, the frame member, and the casing of the lighting device are arranged on the outer periphery of the lighting device, without the LED light source, the board, the frame member, and the casing being arranged. It is possible to have a composite structure of the lighting device according to claim 1 and the wireless communication device. The reason why these members are not placed in positions corresponding to the radio wave emitting surface of the wireless communication device is that if these members are placed in front of the radio wave emitting surface, they will absorb the radio waves emitted from the wireless communication device. This is because transmission loss occurs due to reflection and scattering, so the LED light source, board, frame member, and housing should be placed on the outer periphery as necessary to the extent that they do not interfere with the radio wave radiation of the wireless communication device. is desirable.

The micro-foamed resin sheet disposed in front of the wireless communication device is a micro-foamed resin sheet with an average cell diameter of 0.2 to 10 μm, and the micro-foamed resin sheet is a micro-foamed resin sheet that has an average cell diameter of 0.2 to 10 μm. If the diffuse reflectance of the barium sulfate standard plate is 100%, the micro-foamed resin sheet has a diffuse reflectance of 95% or more relative to the barium sulfate standard plate, and is a light reflecting plate that can also serve as a casing of the lighting device. The micro-foamed resin sheet may be placed in contact with the radio wave emitting surface of the wireless communication device, or may be placed at a predetermined distance from the radio wave emitting surface of the wireless communication device. The dielectric constant of the foamed resin sheet may be measured at a measurement frequency of 2 GHz using a method specified in ASTM D2520 and JIS C2565, and the value may be 1.8 or less. Further, when the micro foam resin sheet and the wireless communication device are separated by a predetermined distance, the distance is preferably 5 mm or less.

The micro-foamed resin sheet placed in front of the wireless communication device has an average cell diameter of 0.2 to 10 μm, so it not only has excellent diffuse reflection properties and dielectric properties, but also has low radio wave transmission loss. It may also be a composite structure of a lighting device and a wireless communication device, which is characterized by low scattering loss.

By arranging the lighting device and the wireless communication device in this way, the micro-foamed resin sheet serves as a light reflection plate for the lighting device to realize an indirect lighting device, and also prevents the transmission of radio waves emitted from the wireless communication device. Moreover, it has the effect of protecting the surface of the wireless communication device, and furthermore, by arranging the lighting device in front of the wireless communication device, the combined structure of the indirect lighting device and the wireless communication device can be miniaturized.

The light transmitting member is made of a light transmitting transparent resin such as PC resin, ABS resin, PET resin, vinyl chloride resin, acrylic resin, polystyrene resin, COP resin, or COC resin, or transparent glass, or the transparent resin. A semi-transparent resin to which a pigment has been added, a semi-transparent resin made translucent by roughening the surface of the transparent resin on the light extraction part side or forming a fine uneven structure, a surface of the transparent resin or the transparent glass. It may be either a translucent laminate with a translucent resin film attached, or translucent colored glass. Here, the resin constituting the light transmitting member includes COP resin, COC resin, and the like. COP resin is known as a transparent general-purpose engineering plastic with excellent transparency, heat resistance, and water absorption, and is used for optical, biological, medical, and automotive applications. Because of its excellent properties, it is used for high-frequency connectors and high-frequency antenna substrate materials. COC resin is a product obtained by copolymerizing COP resin with ethylene resin, rubber resin, etc., and is used to adjust the mechanical properties such as heat resistance and impact properties of COP resin.
Furthermore, among the resins that form the light guide plate, compared to PC resin, ABS resin, PET resin, vinyl chloride resin, acrylic resin, polystyrene resin, etc., the light guide plate is more transparent than other resins, considering the transmittance of radio waves from wireless communication devices. When selecting members, particularly preferred are COP resins and COC resins that have low dielectric constant and dielectric loss tangent.

A part of the front or back surface of the light transmitting member is covered with a thin film-like coating member made of colored paint, metal vapor deposition, or metal plating, or the front or rear surface of the light transmitting member, or an abbreviation of the light transmitting member. A colored resin having a predetermined thickness that is non-light-transmitting is placed on the same plane or inside the light-transmitting member, or a colored resin that is the same as the light-transmitting member is placed in place of a part of the light-transmitting member. Colored resins having different thicknesses or different thicknesses may be arranged. In the present invention, the covering member is used as a light shielding member that blocks light, and has the same meaning as a light shielding member.

When the covering member is provided at a predetermined position of the light transmitting member and the covering member is exposed on the back surface of the light transmitting member, a material having the same size as the covering member and the same size as the covering member is directly placed on the back surface of the covering member. When the micro foam resin sheet is attached and the covering member is not exposed on the back surface of the light transmitting member, the position of the inner circumferential surface of the light transmitting member corresponding to the covering member on the back surface of the light transmitting member. By pasting the micro-foamed resin sheet, which has a similar shape and a slightly smaller size to the covering member, almost all positions of the light-transmitting member on the light-guiding space side, except for the light-transmitting part, are covered with the micro-foamed resin. It is also possible to have a composite structure of a lighting device and a wireless communication device covered with a sheet. In this case, it is desirable to have a structure in which the covering member is provided on the inner surface of the light-transmitting member and the covering member is directly covered with the micro-foamed resin sheet.

A part of the light transmitting member is coated with the coating member selected from colored paint, metal vapor deposition, metal plating, or a non-light transmitting colored resin having a predetermined thickness, or one of the light transmitting members When a non-light transmitting colored resin having a predetermined thickness is disposed as a covering member in place of the light transmitting member in the light transmitting portion or the light transmitting member where the light transmitting member is not covered with the covering member. Light may be extracted from a light transmitting portion in which colored resin is not disposed.

In this way, by using a non-light-transmitting colored resin with a predetermined thickness as the covering member, the shape and thickness of the coated light-transmitting member can be changed as desired by changing the arrangement, shape, and thickness of the covering member. It can be designed to change to In addition, by continuously changing the thickness of the covering member or the light transmitting member on the light transmitting portion side, it is possible to give a three-dimensional effect to the shape of the light extraction portion of the lighting device and improve the design. I can do it. In order to realize such a covering structure of a light transmitting member and a covering member, composite molding such as injection molding may be used. Furthermore, if the covering member is formed into a thin film using colored paint, metal vapor deposition, or metal plating, a light transmitting member having a thin film-like texture can be obtained.

When the covering member is provided at a predetermined position of the light transmitting member and the covering member is formed to be exposed on the back surface of the light transmitting member, the same material as the covering member is directly applied to the back surface of the covering member. When the micro foamed resin sheet of the same size is attached and the covering member is not exposed on the back surface of the light transmitting member, the covering member is placed on the back surface of the light transmitting member at a position corresponding to the covering member. The micro-foamed resin sheet having a similar shape and slightly smaller size or the same size as the covering member may be attached.

The LED light source arranged on the substrate is an RGB light source, a one-chip LED light source whose emission color can be switched to RGB, a white LED light source, a daylight LED light source, a white LED light source using a phosphor, white or daylight color. It may be one of the following LED array light sources or a combination of these light sources.

The light transmitting portion is divided into an outer circumferential side and an inner circumferential side by the covering member provided on the light transmitting member, and indirect light having approximately the same brightness is extracted from the light transmitting portion on the outer circumferential side and the inner circumferential side. Good too.

By arranging the LED light source such that a light transmitting portion through which light is transmitted from the light transmitting member is not included within the orientation angle range of the LED light source, the light transmitting member may have a flat plate shape or a curved surface having an uneven structure. Even if the shape of the light-transmitting part side of the light-guiding space is formed into a flat plate shape or a curved surface having an uneven structure, the reflected light is diffused and multiple-reflected within the light-guiding space, so that the illumination The light extracted from the device can be only substantially uniform indirect light. In this way, even if the shape of the light-transmitting member side of the light-guiding space is a curved surface having an uneven structure, indirect light of approximately the same brightness can be taken out from the light-transmitting part regardless of the light extraction position from the light-transmitting part. It is possible to realize an indirect lighting device that can

The lighting device is an outdoor lighting device, and the wireless communication device is a wireless communication device that is installed on a park, a road, a wall or a rooftop of a building, and communicates with pedestrians and vehicles running on the road. There may be.

The wireless communication device may be a wireless transmitter used in 5G communication, and the lighting device may be an advertising electronic signboard lighting device or a guidance electronic signboard device.

The lighting device may be a lighting device mounted on a moving body, and the wireless communication device may be a millimeter wave radar transmitter. In addition, the above-mentioned moving object refers to an artificial means of transportation that has the ability to move on its own, and for example, the purpose of use of this lighting device is to monitor the surrounding area for detecting obstacles for trains, drones, and robots. It may also be a forward monitoring radar.

The micro-foamed resin sheet has a diffuse reflectance of 95% or more with respect to the barium sulfate standard plate, assuming that the diffuse reflectance of the barium sulfate standard plate in the visible light band of wavelengths from 450 to 650 nm is 100%. Yes, it may be a PET resin sheet or a PC resin sheet in which the radio wave attenuation rate of the micro-foamed resin sheet is within the range of 0 to -0.15 dB relative to the radio wave attenuation rate due to radio wave absorption by air in the wavelength band of 70 to 100 GHz. .

A second invention is a method for arranging a lighting device and a wireless communication device in a composite structure of a lighting device and a wireless communication device, in which the lighting device is placed in front of a wireless communication device using a micro-foamed resin sheet, The lighting device includes an LED light source, a substrate that supports the LED light source, a light transmitting member, a frame member that supports the outer periphery of the light transmitting member, and a light diffusing and reflecting microfoamed resin sheet, The micro-foamed resin sheet is formed so that the cross-sectional shape of the micro-foamed resin sheet has a concave shape so that the light emitted from the light emitting surface of the LED light source is reflected by the micro-foamed resin sheet. and the light transmitting member, the light emitting surface of the LED light source is arranged to face the micro foam resin sheet in a direction opposite to the light transmitting member, and The wireless communication device is arranged on the back side of the light-reflecting surface of the micro-foamed resin sheet, and the micro-foamed resin sheet arranged in front of the wireless communication device serves as a part of the casing of the lighting device. The light emitting surface is arranged so as to be in contact with the radio wave emitting surface of the communication device, or is arranged at a predetermined distance from the radio wave emitting surface of the wireless communication device, and the light beam is disposed in front of the radio wave emitting surface in front of the wireless communication device. Either only the transmitting member is disposed, or the light transmitting member and the micro foam resin sheet are disposed. Arrangement of a lighting device and a wireless communication device, characterized in that a material made of a micro-foamed resin sheet, which has excellent radio wave transparency and has a relative permittivity of 1.8 or less compared to the light-transmitting member, is used as a light reflecting plate. It can also be a method.

Further, in the method for arranging a lighting device and a wireless communication device according to a second aspect of the invention, the micro-foamed resin sheet is formed into a concave shape by heat molding, and the cross-sectional shape is at the center of the concave shape. The molded article may be formed into a substantially U-shape, an inverted trapezoid shape, or a bowl shape, including a flat portion. Moreover, as for the shape of the molded body of the micro-foamed resin sheet, as long as it is formed in a concave shape as a whole, it may include a protrusion in a part. With this shape, the micro-foamed resin sheet acts as a reflector and provides diffuse reflection properties to the lighting device, providing indirect illumination.At the same time, the micro-foamed resin sheet also serves as a casing, allowing for additional lighting. It becomes unnecessary to provide a housing.

Further, according to the method of arranging the lighting device and the wireless communication device in the composite structure of the lighting device and the wireless communication device of the third invention, by arranging the members in the composite structure of the lighting device and the wireless communication device, the diffuse reflection property can be improved. It is possible to obtain a wireless communication device with an illumination device that is excellent in transmission loss and scattering loss of radio waves.

Furthermore, even if the lighting device is placed in front of the wireless communication device, the casing that absorbs radio waves does not exist in front of the wireless communication device, and the micro foam resin sheet is placed in front of the wireless communication device. Therefore, it is possible to obtain a wireless communication device with less radio wave absorption. Furthermore, the micro-foamed resin sheet can provide a protective effect of protecting the surface of the wireless communication device. At this time, the LED light source is arranged on the inner peripheral surface of the outer peripheral side of the molded body of the micro-foamed resin sheet, and it is also possible to arrange the LED light source so that its light emitting surface faces the inner peripheral surface of the opposite outer peripheral side of the molded body. be. Here, the micro-foamed resin sheet is preferably formed into a cylindrical shape, and the LED light sources are preferably attached to the inner peripheral surface of the circumferential surface of the cylinder so as to face each other.

According to the present invention, the light guide space is formed using a light-reflective micro-foamed resin sheet, and the light from the LED light source is multiplexed and diffusely reflected by the micro-foamed resin sheet within the light guide space. The brightness of light extracted from the transparent member can be made uniform. At this time, since a board with high radio wave absorption, an LED light source, etc. are placed around the outer periphery of the light guide space, the light from the LED light source and the radio waves from the wireless communication device are not blocked by the board, etc., and light reflection is prevented. There will be no interference or interference with radio waves emitted from wireless communication devices.

In addition, since the lighting device and wireless communication device are combined, the radio waves emitted from the wireless communication device need to pass through a light-reflective micro-foamed resin sheet, but the dielectric constant of the micro-foamed resin sheet Since the transmission loss is low, there is little transmission loss of radio waves when they pass through the micro-foamed resin sheet. Furthermore, since the lighting device is placed in front of the wireless communication device, it is possible to downsize the combined structure of the lighting device and the wireless communication device.

In addition, since the micro-foamed resin sheet that forms the light guide space also serves as a part of the casing of the lighting device, there is no need to provide a separate casing for the lighting device even if the lighting device is placed in front of the wireless communication device. do not have. Further, since a separate casing is not provided for the lighting device disposed in front of the wireless communication device, absorption and reflection loss of radio waves due to the casing of the lighting device can be prevented.

Furthermore, if the micro foam resin sheet is placed in contact with the surface of the wireless communication device, or if it is placed at a distance of 5 mm or less from the surface of the wireless communication device, the foam may The micro-foamed resin sheet can protect the surface of the wireless communication device, and has the effect of protecting the surface of the wireless communication device.

Furthermore, if the dielectric constant of the micro-foamed resin sheet is 1.8 or less, transmission loss of radio waves when the radio waves are transmitted through the micro-foamed resin sheet can be suppressed more reliably. For example, while the dielectric constant of a normal transparent resin exceeds 2.0, the dielectric constant of a micro-foamed resin sheet is low, so there is little loss such as reflection, absorption, and scattering when transmitting radio waves. The dielectric constant of the micro foamed resin sheet is preferably 1.50 or less.

Furthermore, as the light-transmitting member, not only a transparent light-transmitting member but also a translucent light-transmitting member or a translucent laminate in which a translucent resin film is attached to the surface of a transparent resin or transparent glass can be used. . By doing so, it becomes possible to express colors with a more complex and luxurious feel. Although both glass and resin can be used as the light transmitting member, it is generally preferable to use resin rather than glass in terms of lowering the dielectric constant.

Furthermore, by providing a coating member or a colored resin that covers the light-transmitting member, design can be imparted to the lighting device, and a lighting device with excellent design can be obtained. Although not particularly shown in the drawings, although the surface of the light transmitting member is described as two-dimensional, it can be formed into a three-dimensional shape by injection molding or the like having an uneven structure.

Furthermore, by attaching a micro-foamed resin sheet to a position corresponding to the covering member that covers a part of the light extraction member, the diffuse reflection properties in the light guide space can be further improved. Therefore, the brightness of the light extracted from the light extraction section can be improved. At this time, if the micro-foamed resin sheet is pasted in a position where no covering member is formed, the micro-foamed resin sheet will be directly visible from the outside of the light-transmitting member, reducing the design. The micro-foamed resin sheet is not visible from the outside of the transparent member, and the design can be improved.

In this way, by providing a non-light-transmissive coating member or colored resin to cover the light-transmitting member, light can be extracted only from the light-transmitting parts other than the coating member or colored resin, which improves the design of the lighting device. can be granted.

Additionally, by using multiple types of LED light sources, it is possible to switch between different colors of light or turn on different colors of light at the same time. Therefore, color toning can be performed by switching the emitted light color or by additively mixing different colors. Further, by arranging multiple rows of LED light sources such as LED array light sources, it is possible to increase the size of the lighting device.

Furthermore, by making sure that the light transmitting part of the light transmitting member is not included within the range of the orientation angle of the LED light source, the light transmitting member is formed into a flat plate shape or a curved surface having an uneven structure, and the light guiding space is Even if the shape of the light transmitting part is formed into a flat plate or a curved surface having an uneven structure, the reflected light is diffused and multiple reflected within the light guiding space, so that the light taken out from the lighting device is almost uniformly indirect. It can be only light. Therefore, the glare caused by direct light can be reduced.

In addition, by dividing the light transmitting part into the outer circumferential side and the inner circumferential side by the covering member provided on the light transmitting member, indirect light can be emitted with approximately the same brightness from the light transmitting part on the outer circumferential side and the inner circumferential side of the covering member. It can be taken out. For example, when a large electronic signboard or the like is provided with a logo mark that is divided into an inner circumferential side and an outer circumferential side, light of equal brightness can be extracted from both the inner circumferential side and the outer circumferential side of the logo mark. When applying the present invention to a large-sized lighting device, it is preferable to use a collective light source in which LED light sources are arranged in a grid, houndstooth, or array on a board, and a plurality of wireless communication devices are arranged adjacent to each other. It may also be placed.

In addition, by attaching a wireless transmitter to an outdoor lighting device and installing it in parks, roads, walls or rooftops of buildings, it is a wireless communication device suitable for communicating with pedestrians and cars. Good too. For example, if a wireless transmitter is attached to an outdoor lighting device and the wireless transmitter is used to communicate with pedestrians and cars, there will be no obstacles between pedestrians and cars, so pedestrians and other people can It is suitable for communicating with people in the street and cars driving on the road.

In addition, wireless communication equipment used in 5G communication requires the construction of small cells to stabilize communication, and is usually installed on the roof or wall of a building, but lighting equipment for electronic billboards for advertising By applying it to such places, there are fewer restrictions on the installation location, and it is easy to secure the installation location.

In addition, when a wireless communication device is attached to a moving object, it can be a composite structure of a wireless communication device for detecting obstacles and a lighting device to ensure the safety of moving objects such as trains, drones, and robots. Here, the wireless communication device for a mobile object can have a composite structure of a peripheral monitoring or forward monitoring radar and a lighting device.

In addition, the rate of change in the radio wave attenuation rate of the micro-foamed resin sheet with respect to the radio wave attenuation rate due to radio wave absorption in the air in the wavelength band of 70 to 100 GHz is within the range of 0 to -0.15 dB, and as described above, It is possible to more reliably suppress the absorption of radio waves by the micro-foamed resin sheet placed in front of the wireless communication device.

According to the present invention, a composite structure of a lighting device and a wireless communication device that can extract light of uniform brightness with little loss of radio waves from a wireless communication device, a method of arranging the lighting device and a wireless communication device, and the arrangement. A wireless communication device with a lighting device arranged in a method can be provided.

FIG. 2 is a plan view showing the composite structure 1. FIG. FIG. 2 is a sectional view taken along line AA in FIG. 1. A sectional view taken along the line BB in FIG. 1. An enlarged view of the vicinity of the LED light source 13. A sectional view showing a composite structure 1a. A cross-sectional view showing the composite structure 1b. A partially enlarged view of FIG. 5A. A sectional view showing a composite structure 1c. A sectional view showing a composite structure 1d. A sectional view showing a composite structure 1e. A sectional view showing a composite structure 1f. A sectional view showing a composite structure 1g.

(First embodiment)
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a composite structure 1 of a lighting device and a wireless communication device, FIG. 2A is a sectional view taken along the line AA in FIG. 1, and FIG. 2B is a sectional view taken along the line BB in FIG. . Note that in the following description, illustrations of wiring and the like will be omitted.

As shown in FIGS. 2A and 2B, the composite structure 1 is a composite structure in which the lighting device 3 and the wireless communication device 17 are integrated. The lighting device 3 mainly includes an LED light source 13, a substrate 11 that supports the LED light source 13, a light transmitting member 7, a frame member 5 that supports the outer periphery of the light transmitting member, and a light diffusing and reflecting micro-foamed member. It is composed of a resin sheet 15 and the like.
Here, in FIG. 2B, the lighting device 3 and the wireless communication device 17 are integrated and combined, but even if they are not integrated, the lighting device 3 and the wireless communication device 17 may be placed in contact with each other. , and may be arranged separately within a predetermined distance.

Note that the contour shape of the composite structure 1 (illumination device 3) in plan view may be approximately circular, approximately elliptical, approximately oval, approximately triangular, approximately rectangular, approximately polygonal, approximately H-shaped, etc. of the light guide space described later. It may have any shape as long as it does not impair the diffuse reflectance. In particular, in the case of a substantially polygonal shape, an even-numbered polygon having major and minor axes is desirable from the viewpoint of design.

Here, in the case of the composite structure 1 (illumination device 3) of the present invention, from the point of view of the luminance of the illumination device, it is desirable to arrange the LED light sources 13 all around the substrate 11 arranged around the entire circumference. Even in the case of the embodiment, the LED light source 13 may be arranged on a part or the entire circumference of the substrate 11 arranged on the entire circumference, or the LED light source 13 may be arranged on the substrate 11 arranged on a part of the outer periphery. The LED light source 13 may be arranged over the entire area. The arrangement relationship between these substrates 11 and the LED light sources 13 may be determined as appropriate depending on the design of the lighting device.

The micro-foamed resin sheet 15 is formed to have a concave cross-sectional shape by heat molding, bending, or other molding processes that do not involve heating. The heat forming may be any of press forming, vacuum forming, pressure forming, vacuum pressure forming, and match molding using upper and lower molds. Here, the shape of the micro-foamed resin sheet in plan view may be any shape as long as it does not impair the diffuse reflection properties, but considering the protective effect of the micro-foamed resin sheet, the cross-sectional shape of the micro-foamed resin sheet should be a concave shape. A substantially U-shape, an inverted trapezoid shape, or a bowl-shape is desirable, having a flat part in the center of a concave shape. As mentioned above, the micro-foamed resin sheet 15 has a fine cell structure, so even if the sheet is molded using various molding methods, as long as the cell structure does not change significantly, diffuse reflection and reflection before and after molding will occur. It has a characteristic that the transmission loss of radio waves and the scattering loss of radio waves based on the relative dielectric constant are almost the same.

The micro-foamed resin sheet 15 is, for example, a PET resin sheet or a PC resin sheet. If the diffuse reflectance of the barium sulfate standard plate in the visible light band of wavelengths 450 to 650 nm is 100%, the micro foam resin sheet 15 has a diffuse reflectance of 95% or more with respect to the barium sulfate standard plate. The micro-foamed resin sheet has a specific dielectric constant of desirably 96% or more, more desirably 98% or more, and 1.8 or less. The higher the diffuse reflectance, the higher the brightness can be obtained even after multiple reflections. In other words, the micro-foamed resin sheet 15 is a material that has excellent light diffusing reflectance and, at the same time, excellent radio wave transmittance with a relative dielectric constant of 1.8 or less compared to a substrate or a light transmitting member, and can be used as a light reflecting plate. used.

In the present invention, the dielectric constant of the micro-foamed resin sheet is measured using the method specified in ASTM D2520 and JIS C2565 at a measurement frequency of 2 GHz on a sheet of 78 mm long x 2.4 mm wide x 1 mm thick (foamed resin sheet). The measurement was performed using a sample with a magnification of 4 times.

Note that the dielectric constant of ordinary non-foamed materials such as PET resin and PC resin is 2.9 to 3.0, but the ratio of PET resin foam, PC resin foam, and especially these micro-foamed resin foams is 2.9 to 3.0. Both dielectric constants can be 1.8 or less, or even 1.5 or less. In this way, while the dielectric constant of ordinary transparent resin exceeds 2.0, the dielectric constant of foam is low, so it is possible to reduce losses such as reflection, absorption, and scattering when radio waves are transmitted. can. For example, to show actual measured values, the measurement result of the dielectric constant of the micro-foamed resin sheet of PET resin is 1.31, tan δ (Tangent Delta) is 0.0020, and the dielectric constant of the micro-foamed resin sheet of PC resin is 1.31. is 1.39, tan δ is 0.0022, and the relative permittivity of both PET resin and PC resin is 1.50 or less, and tan δ also satisfies 0.0022 or less, so the heat loss of radio waves is also reduced. It turns out that there are few. In addition, as described separately, since it has a fine cell structure compared to ordinary foam, it has a characteristic that scattering loss when transmitting radio waves is small.

In addition to the above, radio wave absorption loss was evaluated using the S-parameter method. In other words, when two horn antennas are placed facing each other with a predetermined distance of 400 mm, and a micro foam resin sheet with dimensions of 210 mm x 297 mm x 1 mm in thickness is placed in a predetermined position in the space between them, the transmission loss is the reception level between the antennas. It was evaluated as Note that the transmission loss between both antennas when no microfoamed resin sheet is disposed was set to 0 dB. For evaluation of radio wave absorption loss, the absorption loss in the frequency band of 70 to 100 GHz was obtained from S21 of the S parameter using a network analyzer (model number N5291A manufactured by KEYSIGHT).

Here, the rate of change in the radio wave attenuation rate of the micro-foamed resin sheet of PET resin and PC resin with respect to the radio wave attenuation rate due to radio wave absorption in the air in the wavelength band of 70 to 100 GHz is within the range of 0 to -0.15 dB. desirable. By suppressing the radio wave attenuation rate to a maximum of 3.5% greater than that of air, the radio waves emitted from the wireless communication device 17 disposed on the back surface of the micro foam resin sheet 15 are transmitted. loss can be reduced.

Note that the micro-foamed resin sheet 15 preferably has an average cell diameter in the range of 0.2 μm to 10 μm, for example. If the average bubble diameter is too small than 0.2 μm, the light transmittance will increase and the reflectance will decrease. Further, if the average bubble diameter is too large, the diffuse reflectance decreases, so it is desirable that the average bubble diameter is 0.2 μm or more and 10 μm or less. The micro-foamed resin sheet 15 placed in front of the wireless communication device has an average bubble diameter of 0.2 to 10 μm, so it has excellent diffuse reflection properties and dielectric properties, and not only has little radio wave transmission loss, but also has low radio wave scattering. There are also fewer losses.

Let's consider the scattering loss caused by the micro-foamed resin sheet 15. In the present invention, since the micro-foamed resin sheet 15 is placed in front of the wireless communication device 17, it is necessary to consider not only the transmission loss but also the scattering loss of radio waves emitted from the wireless communication device 17. There is.

Here, if the wavelength of the radio waves used is, for example, 100 GHz, the wavelength will be approximately 3 mm. Here, the foam of the present invention has a bubble diameter of 0.2 to 10 μm, which is a sufficiently small diameter of several hundredths of the wavelength of the radio waves, so that when the foam passes through the microfoamed resin sheet, Although it is less susceptible to scattering, when using ordinary foam, the bubble diameter is 100 μm to 300 μm, which is one tenth (1/10) to several tens of minutes compared to the wavelength of approximately 3 mm of millimeter wave radio waves. Since the wavelength is relatively large, the bubbles themselves become a cause of radio wave scattering. As described above, the microfoamed resin sheet 15 has the effect of reducing not only the transmission loss of radio waves but also the scattering loss.

A light transmitting member 7 is arranged on the opening side of the micro-foamed resin sheet 15 formed into a concave shape. The light transmitting member 7 is fixed to the opening edge of the micro foam resin sheet 15 by the frame member 5. Note that although the light transmitting member 7 has a flat plate shape, the front surface of the light transmitting member 7 does not have to have a flat shape. For example, the light transmitting member 7 may have a somewhat uneven shape, such as a shape in which the central portion thereof protrudes forward.

The light transmitting member 7 is made of, for example, a light transmitting transparent resin such as a PC resin, an ABS resin, a PET resin, a vinyl chloride resin, an acrylic resin such as a PMMA resin, a polystyrene resin, a COP resin, a COC resin, or a transparent glass. Applicable. Further, the light transmitting member 7 may be made of a translucent resin obtained by adding a pigment to a transparent resin. Further, the light transmitting member 7 may be a translucent resin made semitransparent by roughening the surface of the transparent resin on the light extraction portion side or forming a fine uneven structure. Further, the light transmitting member 7 may be a translucent laminate in which a translucent resin film is attached to the surface of transparent resin or transparent glass, or may be semitransparent colored glass.

As the translucent light transmitting member 7, for example, titanium oxide, zinc oxide, talc, mica, kaolin, etc. may be added to a transparent resin as a white pigment. In this case, the amount of the pigment added must be controlled within a range that can maintain transparency. Further, in the case of forming a laminate in which a translucent resin film or the like is attached to the surface of a transparent resin or glass, for example, a resin film obtained by coating a polyester film with a vinyl chloride resin can be used.

A light guiding space 19 is formed between the molded micro-foamed resin sheet 15 and the light transmitting member 7. More specifically, by arranging the micro-foamed resin sheet 15 having a concave cross-sectional shape behind the light-transmissive member 7 supported by the frame member, the light-transmissive member 7 and the micro-foamed resin A light guiding space 19 is formed between the sheet 15 and the sheet 15 . A substrate 11 is arranged inside the light guiding space 19 and on the outer periphery of the frame member 5 or the light transmitting member 7. That is, the substrate 11 is formed on the outer periphery of the light transmitting member 7 and arranged on the outer periphery of the light guide space 19. A composite structure of a lighting device and a wireless communication device according to the invention is obtained.

FIG. 3 is an enlarged view of the vicinity of the substrate 11. As described above, the LED light source 13 is arranged on the substrate 11. The LED light source 13 may be an RGB light source, a one-chip LED light source whose emission color can be switched to RGB, a white LED light source, a daylight LED light source, a white LED light source using phosphor, or a white or daylight LED array light source. Either one or a combination of these light sources can be applied.

The LED light source 13 is arranged toward the micro-foamed resin sheet 15 so that the light emitted from the LED light source 13 is reflected by the micro-foamed resin sheet 15. That is, the light-emitting surface of the LED light source 13 faces the micro-foamed resin sheet 15 in the opposite direction to the light-transmitting member so that the light emitted from the light-emitting surface of the LED light source 13 is reflected by the micro-foamed resin sheet 15. be placed towards Furthermore, since the micro-foamed resin sheet 15 has a high diffuse reflectance, the light emitted from the LED light source 13 is diffusely reflected by the micro-foamed resin sheet 15, and a portion of the light is directed toward the light transmitting member 7 while other light is emitted from the LED light source 13. By repeating diffuse reflection inside the light guide space 19, the light becomes uniform, and it becomes possible to extract uniform indirect light.

Note that the shape of the light guide space 19 may be any shape as long as it is a concave shape with a concave cross section so that the reflected light upon receiving the light emitted from the LED light source 13 is easily reflected in the direction of the light transmitting member 7. It can be of any shape. For example, the cross-sectional shape of the micro-foamed resin sheet 15 includes a U-shape, an inverted trapezoid shape, a bowl-shape, a gently concave shape, and the like. On the other hand, when the purpose is to protect the surface of the wireless communication device 17, which will be described later, the shape of the micro-foamed resin sheet 15 may be a substantially U-shape with a flat part in the center of a concave shape, or an inverted table shape. The shape is desirable.

A covering member 9 is placed on the front surface of the light transmitting member 7 to cover a part of the light transmitting member 7. The covering member 9 may be, for example, a thin film coating member 9 made of colored paint, metal vapor deposition, or metal plating. In this case, for example, a thin film plating of In, Ge, Sn, etc. Alternatively, Al may be deposited through a mask with a large number of dot patterns. Alternatively, as the covering member 9, a colored resin having a predetermined thickness that does not transmit light may be provided on the front surface of the light transmitting member 7.

In this way, when a part of the light transmitting member 7 is coated with the coating member 9 made of colored paint, metal vapor deposition, metal plating, or non-light transmitting colored resin having a predetermined thickness, Light is extracted from the light transmitting portion where the light transmitting member 7 is not covered with the coating member 9 made of colored paint, metal vapor deposition, or metal plating, or from the light transmitting portion where no colored resin is disposed.

Here, as shown in FIG. 1, the light transmitting portion is divided into an outer circumferential side 8 and an inner circumferential side 10 by the covering member 9 disposed on the light transmitting member 7. That is, the inner peripheral side 10 is a region surrounded by the covering member 9, and the outer peripheral side 8 is a region formed between the covering member 9 and the frame member 5.

Here, the LED light source 13 is arranged toward the micro foam resin sheet 15 side. At this time, as described above, since the light is made uniform by the internal light guiding space 19, substantially uniform light cannot be taken out from the light transmitting portion of the light transmitting member 7 where the covering member 9 is not arranged. can. Therefore, the indirect light from the light guide space 19 can be extracted from the light transmitting portions on the outer circumferential side 8 and the inner circumferential side 10 at substantially the same brightness.

Note that the emission direction of the LED light source 13 does not necessarily have to be opposite to the light extraction direction. However, by arranging the LED light source 13 such that the light transmitting portion through which light is transmitted from the light transmitting member 7 is not included within the orientation angle range of the LED light source 13, the light extracted from the illumination device 3 can be made into substantially uniform indirect light. It can only be done. For example, even if the light transmitting member 7 is formed in the shape of a flat plate or a curved surface having an uneven structure, and the shape of the light transmitting portion side of the light guide space 19 is formed in the shape of a flat plate or a curved surface having an uneven structure, the light guide Since the reflected light is diffused and multiple reflected within the space 19, the light extracted from the illumination device 3 can be made into only substantially uniform indirect light.

A wireless communication device 17 is arranged on the back side of the reflective surface of the micro-foamed resin sheet 15 on the side opposite to the light guide space 19. That is, the wireless communication device 17 is arranged on the back side of the lighting device 3. Note that the wireless communication device 17 is fixed to a part of the lighting device 3 (for example, the frame member 5) by, for example, a support member (not shown) or the like.

The wireless communication device 17 is a device that can emit radio waves, and can be used for, for example, millimeter wave radar or 5G communication. Note that millimeter wave radar is characterized by being less affected by weather conditions such as rain, snow, and fog, and optical environmental conditions such as brightness. For this reason, millimeter waves in the frequency band from 24 GHz to approximately 80 GHz are used for obstacle detection, but the present invention is not limited to the above range and can also be applied to frequency bands applied to current 5G communications.

Here, in the composite structure 1, the micro foam resin sheet 15 placed in front of the wireless communication device 17 is a light reflecting plate that can also serve as a casing of the lighting device, and the micro foam resin sheet 15 It functions as a part of the housing of the device 3 and is arranged so as to be in contact with the radio wave emitting surface of the wireless communication device 17 . Further, the substrate 11 is formed on the outer periphery of the light transmitting member 7, and the substrate 11 is not arranged at the center of the lighting device 3. Therefore, the substrate 11 is not placed in the radio wave irradiation range in front of the wireless communication device 17, and the radio waves emitted from the wireless communication device 17 pass through the micro foam resin sheet 15 and the light transmitting member 7. Illuminated forward. At this time, the micro-foamed resin sheet 15 is a material that has a lower dielectric constant than the substrate 11, has excellent radio wave transmittance, and has low radio wave absorption. In comparison, loss of radio waves can be reduced. For example, the dielectric constant of a glass epoxy substrate is 4.5 to 5.2.

As described above, according to the present embodiment, by forming the light guiding space 19 between the molded micro-foamed resin sheet 15 and the light transmitting member 7, only indirect light is emitted from the LED light source 13 instead of direct light. can be taken out, making it possible to make the brightness of light uniform depending on the part.

Further, the micro foam resin sheet 15 is arranged so as to overlap the radiation range of the radio waves emitted from the wireless communication device 17, but since it is formed of a material with a low dielectric constant, there is little reflection or absorption of radio waves, and the micro foam resin sheet 15 is The influence of radio wave loss when transmitting through the foamed resin sheet 15 can be reduced. Since the micro-foamed resin sheet 15 has a fine cell structure, even if the sheet is molded by thermoforming, the cell structure will not change significantly, so the light diffusive reflectance, relative dielectric constant, and radio wave characteristics before and after molding will be Transmission loss and radio wave scattering loss are almost the same before and after molding.

On the other hand, the substrate 11 has a higher dielectric constant and a higher radio wave absorption rate than the micro-foamed resin sheet 15, but since the substrate 11 is disposed on the outer periphery of the light-transmitting member 7, the back surface of the micro-foamed resin sheet 15 is Radio waves radiated from the wireless communication device 17 disposed on the side are radiated to the front of the composite structure 1 without passing through the substrate 11. Therefore, loss when transmitting through the substrate 11 can be suppressed.

In this way, only the light transmitting member 7 or the light transmitting member 7 and the micro-light transmitting member 7 are installed in the center of the illumination device corresponding to the radio wave emitting surface in front of the wireless communication device so as not to obstruct the transmission of radio waves from the wireless communication device. Only the foamed resin sheet 15 is arranged, and the LED light source 13, board 11, frame member 5, and casing of the lighting device are not arranged, and the LED light source, board, frame member, and casing of the lighting device are arranged around the outer periphery of the lighting device. By arranging it in the area, the influence of radio wave loss can be reduced. In addition, the micro-foamed resin sheet and the micro-foamed resin sheet include cases where the micro-foamed resin sheet is placed in contact with the radio wave emitting surface of the wireless communication device and cases where the micro-foamed resin sheet is placed at a predetermined distance from the radio wave emitted surface of the wireless communication device. The distance to the wireless communication device is 5 mm or less, and the micro-foamed resin sheet has a micro-foamed cell structure with a dielectric constant of 1.8 or less, so that the effect can be more reliably obtained. That is, the micro-foamed resin sheet is made of a material that has excellent light diffusion and reflection properties, and has a lower dielectric constant and excellent radio wave transmittance than the substrate or the light-transmitting member.

In such a composite structure 1, for example, the lighting device 3 is an outdoor lighting device, and the wireless communication device 17 is a wireless communication device for communicating with pedestrians outside the room or vehicles running on the road. This method is applicable to cases where there is a machine. In this way, with a composite structure in which a wireless transmitter is attached to an outdoor lighting device, there are no obstacles between pedestrians or cars and the outdoor lighting device, making it possible to communicate outdoors using the wireless transmitter. suitable for

It can also be used as a composite structure 1 in which the wireless communication device 17 is a wireless transmitter used in 5G communication, and the lighting device 3 is a lighting device for an advertising electronic signboard or a guide electronic signboard device. By applying a wireless transmitter to a lighting device for an advertising electronic signboard, etc., there are fewer restrictions on the installation location, and it is easy to secure an installation location. In addition, current 5G communication includes frequencies below 30 GHz such as the 28 GHz band, and the upper limit covers bands up to approximately 100 GHz.

Here, in the composite structure of the lighting device and wireless communication device of the present invention, when used as a large lighting device such as an outdoor lighting device, a lighting device for an advertising electronic signboard, or a guidance electronic signage device, a frame By using LED light sources arranged around the outer periphery of the lighting device as a plurality of collective light sources arranged in a grid, houndstooth pattern, or array on a substrate with a predetermined width provided on the member, the lighting device can be In addition to increasing the size, the brightness of the lighting device can be improved. Furthermore, a plurality of wireless communication devices can be provided in parallel. Further, even if the purpose is not to increase the size of the lighting device, by arranging a plurality of LED light sources, it is possible to improve the brightness.

In addition, when the lighting device 3 is a lighting device to be attached to a moving object such as a train, a drone, or a robot, and the wireless communication device 17 is a millimeter wave radar transmitter, the composite structure 1 may be attached to an obstacle on the moving object. It can also be used as a peripheral monitoring or forward monitoring radar for detection. In this way, the composite structure 1 consisting of the wireless communication device 17 capable of emitting millimeter wave radar or the like and the decorative lighting device 3 has a high design quality due to the function of emitting colored light and displaying characters, logos, advertisements, etc. It is possible to increase

Note that as the wavelength band used for the wireless transmitter for mobile communication, millimeter wave radar, such as a radar wavelength in the 24 to 26 GHz band, 77 GHz band, 79 GHz band, etc., can be used. At this time, when comparing typical millimeter wave attenuation characteristics between 79 GHz and 24 GHz bands, the transmission loss differs depending on the material such as glass, resin material, concrete, etc., but the 79 GHz band is larger.

(Second embodiment)
Next, a second embodiment will be described. FIG. 4 is a sectional view showing a composite structure 1a according to the second embodiment. In addition, in the following description, the same reference numerals as those in FIGS. 1 to 3 are given to structures that perform the same functions as those of the composite structure 1, and redundant description will be omitted.

The composite structure 1a has substantially the same structure as the composite structure 1, but the arrangement of the wireless communication device 17 is different. In the composite structure 1a, a housing 21 is used, and the lighting device 3 and the wireless communication device 17 are fixed to the common housing 21 at the outer peripheral portions of the respective devices. At this time, the micro foam resin sheet 15 placed in front of the wireless communication device 17 is placed at a predetermined distance from the radio wave emitting surface of the wireless communication device 17 . Here, although not particularly shown, the lighting device 3 and the wireless communication device 17 do not necessarily have to be fixed together, but may be arranged at a predetermined distance apart, and may be separate members separated from each other at a predetermined distance. It may be fixed. Alternatively, the lighting devices 3 may be placed in front of the wireless communication device 17 in contact with each other, or may be separate from each other and fixed to separate members.

Even with such a composite structure 1a, the same effects as the composite structure 1 described above can be obtained. In this way, the wireless communication device 17 and the lighting device 3 may be in contact with each other, or may not be in contact with each other and may be separated by a predetermined distance.

(Third embodiment)
FIG. 5A is a cross-sectional view showing a composite structure 1b according to the third embodiment. In the following description, a configuration in which the wireless communication device 17 is placed in contact with the micro-foamed resin sheet 15 forming the light guide space will be described, but like the composite structure 1a, the wireless communication device 17 is It may be arranged at a predetermined distance from the micro-foamed resin sheet 15.

The composite structure 1b has substantially the same structure as the composite structure 1, but the arrangement of the covering member 9 is different. FIG. 5B is an enlarged view of section C in FIG. 5A. In the composite structure 1, the covering member 9 is arranged on the front surface of the light transmitting member 7, but in the composite structure 1b, the covering member 9 is arranged on the back surface of the light transmitting member 7. That is, a part of the back surface of the light transmitting member 7 is covered with a thin film coating member 9 made of colored paint, metal vapor deposition, or metal plating, or the back surface of the light transmitting member 7 is coated with a predetermined thickness of non-light transmitting material. A covering member made of a colored resin having a certain color is disposed.

Furthermore, on the back surface of the covering member 9, a micro foamed resin sheet 15a is directly attached to the inner peripheral surface at a position corresponding to the covering member 9. That is, all positions on the light guide space 19 side of the light transmitting member 7 except for the light transmitting portion are covered with a light reflective microfoamed resin sheet 15a. Note that the same member as the micro-foamed resin sheet 15 can be used for the micro-foamed resin sheet 15a.

According to the composite structure 1b, the micro-foamed resin sheet 15a can prevent the light in the light guide space 19 from being absorbed and reflected by the covering member, and can more efficiently diffuse and reflect the light. Therefore, it is possible to extract diffusely reflected light with a more uniform brightness level.

Here, if the micro-foamed resin sheet 15a is attached directly to the back surface of the light-transmitting member 7 without disposing the covering member 9, the micro-foamed resin sheet 15a is a white sheet-like member with no design. Therefore, if the micro-foamed resin sheet 15a is directly visible from the front surface of the light-transmitting member 7, the design quality will deteriorate. On the other hand, by arranging the micro foam resin sheet 15a only on the back surface of the covering member 9, the micro foam resin sheet 15a is not directly visible from the front surface of the light transmitting member 7, and the design can be improved. can.

Note that the composite structure using the covering member 9 and the micro-foamed resin sheet 15a is not limited to the composite structure 1b. FIG. 6A is a cross-sectional view showing the composite structure 1c.

In the composite structure 1c, the covering member 9 is arranged on the front side of the light transmitting member 7, but the micro foam resin sheet 15a is arranged on the back side of the light transmitting member 7 at a position corresponding to the covering member 9. In the composite structure 1c as well, light of uniform brightness can be extracted by the diffuse reflection by the micro-foamed resin sheet 15a, and the micro-foamed resin sheet 15a can be visually recognized from the front side of the light-transmitting member 7 by the covering member 9. can be suppressed.

In this case, the micro-foamed resin sheet 15a is placed at a position corresponding to the colored resin on the back side of the light-transmitting member 7 at a predetermined distance from the colored resin serving as the covering member 9, so that the light-transmitting member 7 can be It is desirable that the micro-foamed resin sheet 15a be formed in a similar shape to the colored resin and slightly smaller so that it is not visible from the outside when the transparent portion is viewed from an oblique direction. On the other hand, if a part of the outer circumference of the micro-foamed resin sheet 15a may be visible from the outside, the micro-foamed resin sheet 15a may be formed to have the same size as the colored resin.

Further, FIG. 6B is a cross-sectional view showing the composite structure 1d. The composite structure 1d is substantially the same as the composite structure 1c, but the non-light-transmitting colored resin 9a is arranged on the front surface of the light-transmitting member 7 so as to be substantially flush with the front surface of the light-transmitting member 7. That is, in a part of the front surface of the light transmitting member 7, a colored resin 9a having a predetermined thickness and being non-light transmitting is disposed on a portion of the light transmitting member 7 that is substantially on the same plane. A micro foamed resin sheet 15a is arranged on the back side of the light transmitting member 7 at a position corresponding to the colored resin 9a. The same effect as the composite structure 1c etc. can be obtained also in the composite structure 1d.

In this case, the micro-foamed resin sheet 15a is placed at a position corresponding to the colored resin 9a on the back surface side of the light-transmitting member 7 at a predetermined distance from the colored resin 9a as the covering member 9, so it is similar to FIG. 6A. Although it is desirable that the micro-foamed resin sheet 15a be formed in a similar shape to the colored resin 9a and slightly smaller, the micro-foamed resin sheet 15a may be formed to have the same size as the colored resin 9a.

Further, FIG. 7A is a cross-sectional view showing the composite structure 1e. The composite structure 1e is substantially the same as the composite structure 1b, but the colored resin 9a is arranged on the back surface of the light transmitting member 7 so as to be substantially flush with the rear surface of the light transmitting member 7. That is, on a part of the back surface of the light transmitting member 7, a colored resin 9a that is non-light transmitting and having a predetermined thickness is arranged on a portion that is substantially on the same plane as the light transmitting member 7, and a position corresponding to the colored resin 9a is arranged. A micro-foamed resin sheet 15a having the same shape as the colored resin 9a is arranged on the back side of the light transmitting member 7. The same effects as the composite structure 1c and the like can be obtained also in the composite structure 1e.

Further, FIG. 7B is a cross-sectional view showing the composite structure 1f. Composite structure 1f is substantially the same as composite structure 1e, but colored resin 9a is arranged inside light transmitting member 7. That is, a colored resin 9a having a predetermined thickness that does not transmit light is arranged inside the light-transmitting member 7, and a micro-foamed resin sheet 15a is arranged on the back side of the light-transmitting member 7 at a position corresponding to the colored resin 9a. be done. The same effect as the composite structure 1c etc. can be obtained also in the composite structure 1f.

In this case, the micro-foamed resin sheet 15a as the covering member 9 is placed at a position corresponding to the colored resin 9a on the back side of the light transmitting member 7 at a predetermined distance from the colored resin 9a, so that the same procedure as in FIG. 6B is performed. Although it is desirable that the micro-foamed resin sheet 15a be formed in a similar shape to the colored resin 9a and slightly smaller, the micro-foamed resin sheet 15a may be formed to have the same size as the colored resin 9a.

Further, FIG. 8 is a cross-sectional view showing the composite structure 1g. The composite structure 1g is substantially the same as the composite structure 1f, but the colored resin 9a is arranged to have substantially the same thickness as the light transmitting member 7. 5A to 8, a micro foam resin sheet 15a is arranged on the back surface of the light transmitting member 7 at a position corresponding to the colored resin 9a as the covering member 9 at a predetermined distance from the colored resin 9a. Alternatively, the micro foam resin sheet 15a can be placed directly on the back side of the covering member 9 placed on the back side of the light transmitting member 7, but the increase in the brightness level of the light extracted from the light transmitting part can be suppressed to a predetermined level. In this case, it is not necessary to arrange the micro-foamed resin sheet 15a on the back side of the covering member 9 and the colored resin 9a.

Also in the composite structure 1g, a microfoamed resin sheet 15a is arranged on the back side of the colored resin 9a. Therefore, light of uniform brightness can be extracted by the diffuse reflection by the micro foam resin sheet 15a, and the colored resin 9a suppresses the micro foam resin sheet 15a from being visible from the front of the light transmitting member 7. be able to.

In this way, a part of the front or back surface of the light transmitting member 7 is covered with a thin film coating member 9 made of colored paint, metal vapor deposition, or metal plating, or the front or back surface of the light transmitting member 7 or the light A colored resin 9a that is non-transparent and has a predetermined thickness is disposed in a portion of the transparent member 7 that is substantially on the same plane or inside the light-transmissive member 7, or instead of a part of the light-transparent member 7, The colored resin 9a having the same thickness as the light transmitting member 7 may be disposed. In this way, a part of the light transmitting member 7 is coated with a coating member 9 made of colored paint, metal vapor deposition, metal plating, or a non-light transmitting colored resin having a predetermined thickness, or is coated with a light transmitting member 9. When a non-light-transmitting colored resin 9a having a predetermined thickness is placed in place of the light-transmitting member 7 in a part of the member 7, the light-transmitting member 7 is not covered with the covering member 9 and the light transmitting Light can be extracted from the transparent portion where the colored resin 9a is not disposed.

In addition, by arranging the micro foam resin sheet 15a on the back side of the light transmitting member 7 at a position corresponding to the covering member 9 or the colored resin 9a, light with uniform brightness can be taken out through diffuse reflection by the micro foam resin sheet 15a. In addition, it is possible to prevent the micro foamed resin sheet 15a from being visible from the front side of the light transmitting member 7 by the covering member 9 or the colored resin 9a.

At this time, if the covering member 9 is provided at a predetermined position of the light transmitting member 7 and the covering member 9 is formed to be exposed on the back surface of the light transmitting member 7, the covering member 9 is directly attached to the back surface of the covering member 9. It is sufficient if a micro foamed resin sheet 15a of the same size as 9 is attached. In addition, if the covering member 9 is not exposed on the back surface of the light transmitting member 7, a similar shape to the covering member 9 but slightly smaller in size may be placed at a position corresponding to the covering member 9 on the back surface of the light transmitting member 7. Alternatively, a micro-foamed resin sheet 15a having the same size as the covering member 9 may be attached.

As described above, according to the invention of the composite structure of a lighting device and a wireless communication device and the method of arranging the lighting device and a wireless communication device of the present invention using a light-diffusing and reflective micro-foamed resin sheet, the front of the wireless communication device Even if the lighting device is placed in the lighting device, the absorption loss of radio waves emitted from the wireless communication device by the components of the lighting device is small, and regardless of the formation position of the light transmitting part that extracts light from the light transmitting member of the lighting device, It is possible to obtain an indirect lighting device with excellent design that makes the brightness of light extracted from the lighting device substantially constant. In these inventions, at least a portion of the front of the wireless communication device is covered with a covering member, which has a dielectric constant of usually 2.0 or more, excluding the micro-foamed resin sheet that has excellent radio wave transparency. Since only the coated light transmitting member is placed, even if the lighting device is placed in front of the wireless communication device, it is possible to obtain a structure and arrangement method for the wireless communication device and the lighting device that have excellent radio wave transparency. can. Further, it is possible to obtain a composite structure of a lighting device and a wireless communication device that not only has low transmission loss of radio waves but also has excellent scattering loss of radio waves. In addition, by arranging a lighting device and a wireless communication device in a composite structure using this method of arranging a lighting device and a wireless communication device, it is possible to create a lighting device that has excellent diffuse reflection characteristics and at the same time has excellent transmission loss and scattering loss of radio waves. It is possible to obtain a wireless communication device with a wireless communication device.

Although the embodiments of the present invention have been described above with reference to the attached drawings, the technical scope of the present invention is not limited to the embodiments described above. It is clear that those skilled in the art can come up with various changes and modifications within the scope of the technical idea stated in the claims, and these naturally fall within the technical scope of the present invention. It is understood that it belongs.

1, 1a, 1b, 1c, 1d, 1e, 1f, 1g...Composite structure 3...Illuminating device 5...Frame member 7...Light transmitting member 8...Outer peripheral side 9...Coating Member 9a...Colored resin 10...Inner peripheral side 11...Substrate 13...LED light source 15, 15a...Micro foam resin sheet 17...Wireless communication device 19...Light guide space 21 ...... Housing

Claims

A composite structure of a lighting device placed in front of a wireless communication device and a wireless communication device using a micro foam resin sheet,
The lighting device includes:
LED light source and
a substrate that supports the LED light source;
a light transmitting member;
a frame member that supports the outer peripheral portion of the light transmitting member;
A light-diffusing and reflective micro-foamed resin sheet,
has
By arranging the micro-foamed resin sheet having a concave cross-sectional shape behind the light-transmissive member supported by the frame member, the light-transmissive member and the micro-foamed resin sheet can be A light guide space is formed between the
The light emitting surface of the LED light source faces the micro foam resin sheet and is oriented in a direction opposite to the light transmitting member so that the light emitted from the light emitting surface of the LED light source is reflected by the micro foam resin sheet. is placed,
The wireless communication device is arranged on the back side of the light reflecting surface of the micro foam resin sheet,
The micro foam resin sheet placed in front of the wireless communication device is placed in contact with the radio wave emitting surface of the wireless communication device as part of the casing of the lighting device, or placed at a predetermined distance from the radio wave emitting surface,
The micro-foamed resin sheet is a material that has excellent light diffusion and reflection properties, and has a lower dielectric constant than the substrate and the light-transmitting member, and has excellent radio wave transparency. Complex structure of communication equipment.
Only the light transmitting member and the micro foam resin sheet are arranged in a central part of the lighting device corresponding to a front radio wave emitting surface of the wireless communication device so as not to obstruct transmission of radio waves from the wireless communication device. and the LED light source, the board, the frame member, and the casing of the lighting device are arranged on the outer periphery of the lighting device, without the LED light source, the board, the frame member, and the casing being arranged. A composite structure of a lighting device and a wireless communication device according to claim 1.
The micro-foamed resin sheet placed in front of the wireless communication device is a micro-foamed resin sheet with an average cell diameter of 0.2 μm to 10 μm, and the micro-foamed resin sheet is made of sulfuric acid in a visible light band with a wavelength of 450 to 650 nm. If the diffuse reflectance of the barium standard plate is 100%, the micro-foamed resin sheet has a diffuse reflectance of 95% or more with respect to the barium sulfate standard plate, and is a light reflecting plate that can also serve as a casing of the lighting device. , the micro-foamed resin sheet includes cases where the micro-foamed resin sheet is placed in contact with a radio wave emitting surface of the wireless communication device and cases where the micro-foamed resin sheet is placed a predetermined distance away from the radio wave emitted surface of the wireless communication device. Claim 2, characterized in that the relative dielectric constant of the resin sheet is measured at a measurement frequency of 2 GHz using a method specified in ASTM D2520 and JIS C2565, and the value is 1.8 or less. A composite structure of lighting equipment and wireless communication equipment.
The micro-foamed resin sheet placed in front of the wireless communication device has an average cell diameter of 0.2 to 10 μm, so it not only has excellent diffuse reflection properties and dielectric properties, but also has low radio wave transmission loss. The composite structure of a lighting device and a wireless communication device according to claim 3, characterized in that scattering loss is also small.
The light transmitting member is made of a light transmitting transparent resin such as PC resin, ABS resin, PET resin, vinyl chloride resin, acrylic resin, polystyrene resin, COP resin, or COC resin, or transparent glass, or the transparent resin. A semi-transparent resin to which a pigment has been added, a semi-transparent resin made translucent by roughening the surface of the transparent resin on the light extraction part side or forming a fine uneven structure, a surface of the transparent resin or the transparent glass. 2. The composite structure of a lighting device and a wireless communication device according to claim 1, wherein the structure is either a translucent laminate to which a translucent resin film is attached, or a translucent colored glass.
A part of the front or back surface of the light transmitting member is covered with a thin film-like coating member made of colored paint, metal vapor deposition, or metal plating, or the front or rear surface of the light transmitting member, or an abbreviation of the light transmitting member. A colored resin having a predetermined thickness that is non-light-transmitting is placed on the same plane or inside the light-transmitting member, or a colored resin that is the same as the light-transmitting member is placed in place of a part of the light-transmitting member. 6. The composite structure of a lighting device and a wireless communication device according to claim 5, wherein a thick colored resin is disposed.
When the covering member is provided at a predetermined position of the light transmitting member and the covering member is formed to be exposed on the back surface of the light transmitting member, the same material as the covering member is directly applied to the back surface of the covering member. When the micro foamed resin sheet of the same size is attached and the covering member is not exposed on the back surface of the light transmitting member, the covering member is placed on the back surface of the light transmitting member at a position corresponding to the covering member. 7. The composite structure of a lighting device and a wireless communication device according to claim 6, wherein the micro-foamed resin sheet having a similar shape and slightly smaller size or the same size as the covering member is attached.
A part of the light transmitting member is coated with the coating member selected from colored paint, metal vapor deposition, metal plating, or a non-light transmitting colored resin having a predetermined thickness, or one of the light transmitting members When a non-light-transmitting colored resin having a predetermined thickness is placed in place of the light-transmitting member in the part, the light-transmitting part where the light-transmitting member is not covered with the covering member or the colored resin is 7. The composite structure of a lighting device and a wireless communication device according to claim 6, wherein light is extracted from a light transmitting portion that is not arranged.
The LED light source arranged on the substrate is an RGB light source, a one-chip LED light source whose emission color can be switched to RGB, a white LED light source, a daylight LED light source, a white LED light source using a phosphor, white or daylight color. 2. The composite structure of a lighting device and a wireless communication device according to claim 1, characterized in that it is one of the following LED array light sources or a combination of these light sources.
By arranging the LED light source such that a light transmitting portion through which light is transmitted from the light transmitting member is not included within the orientation angle range of the LED light source, the light transmitting member may have a flat plate shape or a curved surface having an uneven structure. Even if the shape of the light-transmitting part side of the light-guiding space is formed into a flat plate shape or a curved surface having an uneven structure, the reflected light is diffused and multiple-reflected within the light-guiding space, so that the illumination 2. The composite structure of a lighting device and a wireless communication device according to claim 1, wherein the light extracted from the device consists only of substantially uniform indirect light.
The light transmitting portion is divided into an outer circumferential side and an inner circumferential side by the covering member provided on the light transmitting member, and indirect light from the light transmitting portions on the outer circumferential side and the inner circumferential side is extracted with substantially the same brightness. The composite structure of a lighting device and a wireless communication device according to claim 8.
The lighting device is an outdoor lighting device, and the wireless communication device is a wireless communication device that is installed on a park, a road, a wall or a rooftop of a building, and communicates with pedestrians and vehicles running on the road. A composite structure of a lighting device and a wireless communication device according to any one of claims 1 to 11.
Any one of claims 1 to 11, wherein the wireless communication device is a wireless transmitter used in 5G communication, and the lighting device is a lighting device for an advertising electronic signboard or a guidance electronic signboard device. A composite structure of a lighting device and a wireless communication device according to claim 1.
The lighting device according to any one of claims 1 to 11, wherein the lighting device is a lighting device mounted on a moving object, and the wireless communication device is a millimeter wave radar transmitter. Complex structure of communication equipment.
Claim 1, characterized in that the rate of change in the radio wave attenuation rate of the micro-foamed resin sheet with respect to the radio wave attenuation rate due to radio wave absorption by air in the wavelength band of 70 to 100 GHz is within the range of 0 to -0.15 dB. A composite structure of a lighting device and a wireless communication device according to .
A method for arranging a lighting device and a wireless communication device in a composite structure of a lighting device and a wireless communication device, in which the lighting device is placed in front of a wireless communication device using a micro-foamed resin sheet, the method comprising:
The lighting device includes an LED light source, a substrate supporting the LED light source, a light transmitting member, a frame member supporting an outer peripheral portion of the light transmitting member, and a light diffusing and reflecting microfoamed resin sheet. ,
The micro-foamed resin sheet is formed so that the micro-foamed resin sheet has a concave cross-sectional shape so that the light emitted from the light emitting surface of the LED light source is reflected by the micro-foamed resin sheet. and the light transmitting member, the light emitting surface of the LED light source is arranged to face the micro foam resin sheet in a direction opposite to the light transmitting member, and
The wireless communication device is arranged on the back side of the light reflecting surface of the micro foam resin sheet,
The micro foam resin sheet placed in front of the wireless communication device is placed in contact with the radio wave emitting surface of the wireless communication device as part of the housing of the lighting device, or placed at a predetermined distance from the radio wave emitting surface,
In front of the radio wave emitting surface in front of the wireless communication device, either only the light transmitting member is disposed, or the light transmitting member and the micro foam resin sheet are disposed,
The micro-foamed resin sheet is a material that has excellent light diffusing reflectance and, at the same time, excellent radio wave transmittance with a relative dielectric constant of 1.8 or less compared to the substrate and the light transmitting member, and is used as a light reflecting plate. A method of arranging a lighting device and a wireless communication device, characterized in that:
The micro-foamed resin sheet is formed into a concave shape by heat molding or molding without heating, and the cross-sectional shape is approximately U-shaped or inverted, with a flat part in the center of the concave shape. 17. The lighting device and wireless communication device according to claim 16, wherein the lighting device and the wireless communication device are molded into either a trapezoidal shape or a bowl shape, and have the same diffuse reflection reflectance and dielectric constant before and after molding. Placement method.
The method for arranging a lighting device and a wireless communication device according to claim 16 or 17 provides excellent diffuse reflection characteristics and radio wave transmission loss, which is obtained by arranging a composite structure of a lighting device and a wireless communication device. and a wireless communication device with a lighting device that has excellent scattering loss.