JP6846977B2 - Wireless device installation method and housing - Google Patents

Description

The present invention relates to a wireless device installation method and an accommodating body.

In 5G (5th Generation, 5th generation mobile communication system), it is considered to install a small cell base station in an area where people are crowded in addition to the macro cell base station. In addition to this, a wireless LAN (Local Area Network) can be installed in the city to install IoT (Internet of Things) devices that have wireless functions and measurement functions such as weather, and to offload the traffic of the small cell base station mentioned above. ) Installation of access points is also being considered. Therefore, in order to realize a 5G environment, it is necessary to consider installing a large number of IoT devices, wireless LAN access points, etc., as in the case of small cell base stations.

For example, as shown in FIG. 24, it is assumed that the small cell base stations 102-1, 102-2, and 102-3 are installed in a street where many buildings 100 are lined up. In this case, by installing the small cell base stations 102-1, 102-2, 102-3 at a relatively high place on the wall surface of the building 100, for example, about 20 m from the ground, they are on the sidewalks on both sides of the street. It becomes possible to provide wireless communication services to users.

However, if a large number of small cell base stations 102-1, 102-2, 102-3, a large number of IoT devices, wireless LAN access points, etc. (hereinafter referred to as "wireless devices") themselves are installed on the wall surface of the building 100, It can spoil the view of the street. On the other hand, many internally illuminated signboards 101 having lighting inside are installed in relatively high places of many buildings 100, and by installing a wireless device in such signboards 101, It will not spoil the landscape. Further, since the power supply pipeline has already been laid on the signboard 101, there is an advantage that it is not necessary to newly lay the power supply pipeline (see, for example, Non-Patent Document 1).

As another installation example, consider a place such as a station concourse as shown in FIG. 25, an underground shopping mall around the station, a department store, or the like. In such a place, by installing a large number of wireless devices 205-1, 205-2, 205-3 on the ceiling 200, the pillar 201, the wall 202, etc., it is possible to provide the wireless communication service to the user. However, if the wireless devices 205-1, 205-2, and 205-3 themselves are installed, the landscape may be spoiled as in the example shown in FIG. 24. Therefore, as shown in FIG. 25, the wireless devices 205-1, 205-2, 205-3 are installed in the internally illuminated lighting device 203 already installed on the ceiling 200, the pillar 201, the wall 202, and the like. And it will not spoil the scenery. Since the power supply line is laid in the lighting device 203, there is also an advantage that it is not necessary to newly lay the power supply line in this case as well.

Atsushi Ota, Kazuki Maruta, Hiroshi Shirato, Satoshi Kurosaki, Ken Tanaka, Masataka Iizuka, "Digital Assisted Analog Beamforming in Millimeter Wave Band Large-Scale Antenna Systems-Proposal of Basic Concept-", Shingaku Giho, vol.116, no.383, RCS2016-232, pp.135-140, December 2016.

However, although Non-Patent Document 1 proposes to install a wireless device such as an entrance line providing relay station or a small cell base station on a signboard, it is specifically installed inside the signboard so as not to spoil the scenery. No method is shown. For example, when a wireless device is actually installed inside an internally illuminated light source device such as a signboard or a lighting device having a light source such as an LED (Light Emitting Diode) or a fluorescent lamp inside, the radio signal output by the wireless device It is necessary to install the wireless device at a position where electromagnetic waves propagate efficiently. However, depending on the position where the wireless signal is installed, the wireless device blocks a part of the light emitted by the light source, and the shadow of the wireless device, that is, the dark part, appears on the light transmitting member such as the display panel of the signboard or the glove of the lighting device. It will occur. Therefore, if it is a signboard, there is a problem that the basic function of transmitting some information to the viewer is impaired.

In addition, the internally illuminated light source device uses an electromagnetic wave reflecting member such as metal for the frame that serves as the frame of the signboard for signboards and the chassis for lighting devices, and is part of the electromagnetic waves output by the wireless device. Is reflected by the electromagnetic wave reflecting member. In addition, since the electromagnetic waves output by the wireless device are also reflected by the light transmitting member, unnecessary reflected waves are generated in the signboard and the lighting device, which reduces the transmitted power to the outside and causes interference. There is also a problem that the reception level is lowered.

In view of the above circumstances, an object of the present invention is to provide a technique capable of preventing the generation of unnecessary reflected waves without causing a dark portion in the light transmitting member when the wireless device is installed inside.

One aspect of the present invention is a method of installing a wireless device in an accommodating body, which is composed of an electromagnetic wave reflecting member that reflects electromagnetic waves and a light transmitting member that transmits light, and has a light source and a wireless device inside. The wireless device has a light emitting surface that emits light, the light emitting surface of the wireless device is arranged so as to face the direction of the light transmitting member, the wavelength of the frequency used is λ, and the film thickness is an odd number of λ / 4. This is a method of installing a wireless device in which an antireflection film having a predetermined refractive index that is twice as high is provided on a part or the whole of the inside and the outside of the light transmitting member in a single layer or a plurality of layers.

One aspect of the present invention is a method of installing a wireless device in an accommodating body, which is composed of an electromagnetic wave reflecting member that reflects electromagnetic waves and a light transmitting member that transmits light, and has a light source and a wireless device inside. The radio device is made of a material that transmits light from the light source, and the light transmission is performed through an antireflection film having a predetermined refractive index whose film thickness is an odd multiple of λ / 4, where the wavelength of the frequency used is λ. This is a method of installing a wireless device in which a single layer or multiple layers are provided on a part or the whole of the inside and the outside of a member.

One aspect of the present invention is a method of installing a radio device in an accommodating body, which is composed of an electromagnetic wave reflecting member that reflects electromagnetic waves and a light transmitting member that transmits light, and has a light source and a radio device inside. The electromagnetic wave reflecting member is provided with a reflecting plate for reflecting light from the light source between the wireless device and the light transmitting member, and the wavelength of the frequency used is λ, and the film thickness is an odd multiple of λ / 4. This is a method of installing a wireless device in which an antireflection film having a predetermined refractive index is provided on a part or the whole of the inside and the outside of the light transmitting member in a single layer or a plurality of layers.

One aspect of the present invention is the above-mentioned wireless device installation method, in which the reflector is installed at a position where the reflected light is further reflected or diffusely reflected by the wireless device.

One aspect of the present invention comprises an electromagnetic wave reflecting member that reflects electromagnetic waves, a light transmitting member that transmits light, a light source that irradiates light, and a wireless device that has a light emitting surface that emits light. The light emitting surface of the radio device is arranged so as to face the direction of the light transmitting member, and the film thickness is an odd multiple of λ / 4, with the wavelength of the frequency used being λ, and the antireflection having a predetermined refractive index. A container in which a film is provided in a single layer or a plurality of layers on a part or the whole of the inside and the outside of the light transmitting member.

One aspect of the present invention is composed of a light source that irradiates light and a material that transmits light from the light source inside, which is composed of an electromagnetic wave reflecting member that reflects electromagnetic waves and a light transmitting member that transmits light. An antireflection film having a predetermined refractive index whose film thickness is an odd multiple of λ / 4 is formed inside and outside the light transmitting member, where the wavelength of the frequency to be used is λ. A housing that is partially or wholly provided in a single layer or multiple layers.

In one aspect of the present invention, an electromagnetic wave reflecting member that reflects electromagnetic waves, a light transmitting member that transmits light, a light source that irradiates light, a wireless device, and light from the light source are transmitted to the radio. A reflecting plate for reflecting between the apparatus and the light transmitting member is provided, and the reflecting plate is provided in the electromagnetic wave reflecting member, and the wavelength of the frequency used is λ, and the film thickness is λ / 4. An accommodating body in which an antireflection film having a predetermined refractive index of an odd multiple is provided in a single layer or a multilayer on a part or the whole of the inside and the outside of the light transmitting member.

One aspect of the present invention is the housing, in which the reflector is installed at a position where the reflected light is further reflected or diffusely reflected by the wireless device.

INDUSTRIAL APPLICABILITY According to the present invention, when the wireless device is installed inside, a dark portion is not generated in the light transmitting member, and it is possible to prevent the generation of unnecessary reflected waves.

It is a perspective view which shows the internally illuminated signboard by one Embodiment of this invention. It is a perspective view which shows the internal structure of the internally illuminated signboard by the same embodiment. It is a top sectional view of the internally illuminated signboard by the same embodiment. It is a figure (the 1) which shows the installation position of the wireless device by the same embodiment. It is a figure (the 2) which shows the installation position of the wireless device by the same embodiment. It is a figure which shows the reflected wave generated between a wireless device and a display panel by the same embodiment. It is a perspective view which shows the internal structure when the antireflection film is attached to the internally illuminated signboard by the same embodiment. It is a top sectional view in the case where the antireflection film is attached to the internally illuminated signboard by the same embodiment. It is a side sectional view in the case where the antireflection film is attached to the internally illuminated signboard by the same embodiment. It is a figure which shows the structure of the antireflection film of the same embodiment. It is a figure which shows the structure of the multilayer antireflection film of the same embodiment. It is a figure which shows the installation example of the wireless device which has the planar light emitting part of the same embodiment. It is a figure which shows the installation example of the wireless device manufactured from the material which transmits light of the same embodiment. It is a figure which shows the installation example of the antenna part and the control part of the wireless device of the same embodiment. It is a figure (the 1) which shows the installation example of the reflector of the same embodiment. It is a figure (the 2) which shows the installation example of the reflector of the same embodiment. It is a figure (the 3) which shows the installation example of the reflector of the same embodiment. It is a figure which shows the simulation result (with the antireflection film) of the internally illuminated signboard of the same embodiment. It is a figure which shows the simulation result (without the antireflection film) of the internally illuminated signboard of the same embodiment. It is a figure which shows the installation example which installs a wireless device close to a frame-shaped frame in the internally illuminated signboard of the same embodiment. It is a figure which shows the simulation result (without the antireflection film) in the installation example of FIG. It is a perspective view of the internally illuminated lighting apparatus which is another embodiment of this invention. It is a side sectional view of the same internally illuminated lighting apparatus. It is a figure which shows the installation example of the small cell base station in the street where buildings are lined up. It is a figure which shows the example of installation of the wireless device on the ceiling, the pillar, or the wall of the station concourse, the underground mall around the station, and the department store.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an internally illuminated signboard 1 according to an embodiment of the internally illuminated light source device of the present invention, and FIG. 2 is a state in which the display panel 3-1 in front of the internally illuminated signboard 1 is removed. It is a perspective view which shows the internal structure. In the internally illuminated signboard 1, the frame-shaped frame 2 is a rectangular parallelepiped-shaped housing body formed of, for example, an electromagnetic wave reflecting member made of a metal such as aluminum, and two of the six rectangular parallelepiped-shaped surfaces facing each other are opposed to each other. It has an open shape. Further, as shown in FIG. 2, the frame-shaped frame 2 is supported from the inside by a plurality of support members 8 so as to maintain the shape. The material of the support member 8 is also an electromagnetic wave reflecting member made of a metal such as aluminum.

One end of the mounting member 4 is joined to the frame-shaped frame 2, and the other end is joined to, for example, the wall surface of the building to fix the internally illuminated signboard 1 to the wall surface of the building. The display panels 3-1 and 3-2 are surface-shaped panels of a light transmitting member made of acrylic or the like, and information to be transmitted, for example, the characters "aiueo" in the examples of FIGS. 1 and 2 are displayed. It is displayed by being formed or printed on the surface. The display panels 3-1 and 3-2 are attached so as to close the two openings of the frame-shaped frame 2.

The wireless device 6 is, for example, a small cell base station, an IoT device, a wireless LAN access point, etc., and is provided inside the internally illuminated signboard 1, that is, by a frame-shaped frame 2 and two display panels 3-1 and 3-2. It is installed in the enclosed space. Further, the wireless device 6 receives power from the power supply line 5 and outputs an electromagnetic wave of a wireless signal having a wavelength λ. This electromagnetic wave propagates to the outside of the internally illuminated signboard 1.

The LED 7 is attached at a position where the display panels 3-1 and 3-2 are illuminated, for example, at a position where the vertical and horizontal support members 8 intersect. In the example of FIG. 2, a total of 12 LEDs 7 are attached, 6 on the front side and 6 on the back side. Further, the LED 7 emits light by receiving power supplied from a power supply line (not shown) laid through the same power supply line as the power supply line 5.

FIG. 3 is a plan sectional view of the internally illuminated signboard 1 shown in FIG. 1 as viewed from the direction of arrow A, and the plurality of LEDs 7 are supported so as to illuminate each of the display panels 3-1 and 3-2. It is attached to both sides of the member 8. The wireless device 6 is installed so that the direction of outputting the electromagnetic wave of the wireless signal faces the display panels 3-1 and 3-2 and is close to one of the display panels 3-1 and 3-2. .. Here, the radiation surface of the electromagnetic wave of the wireless device 6 is parallel to or substantially parallel to the surface of the display panel 3-2, and the radiation direction of the electromagnetic wave is perpendicular to or substantially perpendicular to the surface of the display panel 3-2. It shall be installed in close proximity to the display panel 3-2. An antireflection film for preventing the reflection of electromagnetic waves, which will be described later, is attached to one of the display panels 3-2, which is close to the wireless device 6.

The distance L1 from the wireless device 6 to the display panel 3-2 (to be exact, the distance from the surface of the wireless device 6 that reflects electromagnetic waves to the surface of the antireflection film attached to the display panel 3-2) is the wireless device. The length is an absolute value that is an integral multiple of 1/2 of the wavelength λ of the electromagnetic wave output by 6. FIG. 4 is a diagram showing a position where the wireless device 6 is installed. The wireless device 6 is a position moved from the center position of the frame-shaped frame 2 toward the display panel 3-2, and is a display panel. It is installed at a position separated from 3-2 by a distance L1 (hereinafter, the position is referred to as the vicinity of the center of the display panel 3-2). As a method for fixing the wireless device 6, for example, a method of attaching a jig made of a material that transmits light to a frame-shaped frame 2 or a support member 8 and fixing the wireless device 6 with the jig is applied.

(Installation position of wireless device)
FIG. 5 is a diagram illustrating a reason for installing the wireless device 6 at the positions shown in FIGS. 3 and 4. For example, when the wireless device 6 is installed at the position shown in the wireless device 6-1, the electromagnetic wave output by the wireless device 6-1 is reflected by the support member 8 to generate a reflected wave 20. Further, when the distance L4 between the wireless device 6-1 and the frame-shaped frame 2 is short, the reflected wave 20 generated by the frame-shaped frame 2 also increases. An increase in the reflected wave 20 will increase an unnecessary interference wave 24. Since the desired wave 23 and the interference wave 24 are combined with each other out of phase on the receiving side, the reception level on the receiving side decreases as the interference wave 24 increases.

On the other hand, assuming that the position of the wireless device 6 shown in FIGS. 3 and 4, and this position is the position where the wireless device 6-2 is installed in FIG. 5, between the display panel 3-2 and the support member 8. Since it is installed in the space of the above, the reflection by the support member 8 is eliminated, and the generation of the reflected wave 20 can be suppressed. Further, as shown in FIG. 4, by installing the wireless device 6 at a position near the center of the display panel 3-2, the distance L2 and the distance L3 to the frame-shaped frame 2 can be lengthened, so that the frame-shaped frame can be lengthened. The reflected wave 20 generated by 2 can be suppressed. By suppressing the generation of the reflected wave 20, the interference wave 24 can be suppressed and the reception level can be improved.

(Attachment of antireflection film to display panel)
Even if the wireless device 6 is installed at the positions shown in FIGS. 3 and 4, as shown in FIG. 6, the electromagnetic wave output by the wireless device 6 is reflected by the display panel 3-2 and further reflected by the wireless device 6. The reflected wave 25 is generated by the multiple reflection. Interference wave 24 is also generated by this multiple reflection, so that the reception level is lowered. Further, the reflection on the display panel 3-2 causes the transmitted power to decrease from the viewpoint of the energy conservation law.

In order to prevent this multiple reflection, as shown in FIG. 7, antireflection films 9f and 9b are attached to the front and back surfaces of the display panel 3-2 near the position where the wireless device 6 is installed. 8 is a cross-sectional view of the perspective view of FIG. 7 viewed from the direction of arrow A, and FIG. 9 is a cross-sectional view of FIG. 7 viewed from the direction of arrow B. As shown in FIGS. 8 and 9, the antireflection film 9f is attached to the outside of the display panel 3-2, and the antireflection film 9b is attached to the inside of the display panel 3-2.

The film thickness and the refractive index of the antireflection films 9f and 9b will be described with reference to FIG. The film thickness of the antireflection films 9f and 9b is an absolute value that is an odd multiple of 1/4 of the wavelength λ of the electromagnetic wave output by the wireless device 6. The reason for setting the film thickness to an odd multiple of λ / 4 is, for example, the phase of the reflected wave reflected on the surface of the inner antireflection film 9b in contact with the outside air and the reflected wave reflected on the inner surface of the display panel 3-2. This is because the phases of are opposite to each other and cancel each other out. Similarly, regarding the film thickness of the outer antireflection film 9f, the phase of the reflected wave reflected on the outer surface of the display panel 3-2 and the phase of the reflected wave reflected on the surface of the outer antireflection film 9f in contact with the outside air. However, this is because they are out of phase and cancel each other out.

Antireflection film 9f, the refractive index n _c of 9b is a refractive index of the outside air and n _1, if the refractive index of the material of the display panel 3-2 and the n _2, is determined on the basis of the following equation (1).

n _c = (n ₁ x n ₂ ) ^1/2 ... (1)

For example, when the material of the display panel 3-2 is acrylic, the refractive index n ₂ of the display panel 3-2 is "1.49". Assuming that the refractive index n _{1 of the} outside air is "1.00", the refractive index n _c of the antireflection films 9f and 9b is "1.22". As a dielectric material having a refractive index of 1.22, for example, ULKS (registered trademark), which is a porous silica film shown in the following references, is known, and if it is manufactured using such a material, Antireflection films 9f and 9b having a desired refractive index can be obtained.

[Reference] Takahiro Nakayama et al., "Development of Low-k Material Wiring Module Technology", ULVAC, Inc., ULVAC TECHNICAL JOURNAL No.67 2007, p9-p12

The outside air differences refractive index n ₁ and the display panel refractive index n ₂ of the material 3-2, a portion of the reflected electromagnetic waves are generated at the interface of the display panel 3-2 and the outside air. Therefore, by attaching an anti-reflection film 9f of the refractive index n _c calculated based on Equation (1), and 9b on the outside and the inside of the display panel 3-2, in the outside air and the boundary surface of the display panel 3-2 It is possible to suppress the reflection of electromagnetic waves. As shown in FIGS. 7 to 9, the antireflection films 9f and 9b may be attached to a part of the vicinity of the position of the wireless device 6 or may be attached to the entire surface of the display panel 3-2. You may do so.

As shown in FIG. 3, the wireless device 6 is installed so that the surface of the wireless device 6 and the surface of the antireflection film 9b are separated by a distance L1. The length of the distance L1 is the length of an absolute value that is an integral multiple of 1/2 of the wavelength λ of the electromagnetic wave output by the wireless device 6. The reason why the distance L1 is an integral multiple of 1/2 of the wavelength λ is that when the reflected wave 25 generated by the antireflection film 9b, the display panel 3-2, and the antireflection film 9f is reflected again on the surface of the radio device 6, This is because the phase is the same as the electromagnetic wave output by the wireless device 6. By having the same phase, it is possible to suppress the generation of the interference wave 24, so that it is possible to prevent a decrease in the reception level.

As described above, the position where the wireless device 6 is installed is near the center of the display panel 3-2, and the distance L1 from the surface of the inner antireflection film 9b to the surface of the wireless device 6 is the electromagnetic wave output by the wireless device 6. The length is an absolute value that is an integral multiple of 1/2 of the wavelength λ. Antireflection films 9f and 9b having a refractive index defined by the formula (1) and having an absolute value thickness of an odd multiple of λ / 4 are attached to the display panel 3-2. As a result, the generation of the reflected waves 20 and 25 can be suppressed, so that the generation of the interference wave 24 can also be suppressed, and the decrease in the transmitted power can be suppressed. Therefore, the reception level of the desired wave 23 can be improved.

(Multi-layer antireflection film)
FIG. 11 is a diagram showing an example in which the antireflection films 9f and 9b to be attached to the display panel 3-2 are multi-layered. The antireflection film 9f contains an antireflection film 9f-1 to 9fm, and the antireflection film 9b contains an antireflection film 9b-1 to 9b-m. The film thickness of one layer of the antireflection film 9f-1 to 9fm and the antireflection film 9b-1 to 9b-m is an absolute value that is an odd multiple of 1/4 of the wavelength λ of the electromagnetic wave output by the wireless device 6. It becomes the thickness of. The wireless device 6 is installed so that the surface of the wireless device 6 and the surface of the inner antireflection film 9bm are separated by a distance L1 (an absolute value that is an integral multiple of 1/2 of the wavelength λ).

The refractive index of each of the antireflection film 9f-1 to 9fm and the antireflection film 9b-1 to 9b-m is determined by the refractive index of the substance existing before and after the electromagnetic wave output by the radio device 6 passes through. .. For example, the refractive index of 9f- outer i-1 th antireflection film (i-1) and _{n i-1,} and the refractive index of 9f- outer (i + 1) -th reflection preventing film (i + 1) and _{n i + 1} If the refractive index _{n ci} outside of the i-th antireflection film 9f-i is defined by the following equation (2).

n _ci = (n _i-1 x _{ni + 1} ) ^1/2 ... (2)

Note that the first anti-reflection film _9f-1, the refractive index of _{n i-1} becomes the refractive index of the display panel 3-2, for the m-th reflection preventing film _9f-m, the refractive index of _{n i + 1} However, it becomes the refractive index of the outside air. The refractive index of each of the inner antireflection films 9b-1 to 9b-m is similarly determined according to the formula (2). The first anti-reflection film _9b-1, the refractive index of _{n i-1} becomes the refractive index of the display panel 3-2, for the m-th reflection preventing film _9f-m, the refractive index of _{n i + 1} is, It is the refractive index of the outside air. When the wireless device 6b as shown in FIG. 13 is brought into close contact with the m-th antireflection film 9fm _{, the refractive index of ni + 1 is} the refractive index of the light-transmitting material used in manufacturing the wireless device 6b. Become.

As shown in FIG. 11, by increasing the number of layers such as the antireflection films 9f-1 to 9fm and 9b-1 to 9b-m, more reflected waves 25 can be canceled, so that the interference wave 24 Can be suppressed, and a decrease in transmitted power can be suppressed. Therefore, the reception level of the desired wave 23 can be improved.

Further, in FIG. 11, the number of layers of the outer antireflection film 9f-1 to 9fm and the number of layers of the inner antireflection film 9f-1 to 9fm are the same number of m. The number of layers may be different between the inside and the outside.

(Means for removing dark areas on the display panel "Part 1")
As described above, when the wireless device 6 is actually installed at the position indicated by the wireless device 6-2 in FIG. 5, the wireless device 6 blocks the light 22 from the LED 7, so that the display panel 3-2 21 will be generated in the dark part 21. As a dark portion removing means for removing the dark portion 21, for example, there is a means for using a wireless device 6a having a planar light emitting unit 60 shown in FIG. The dark portion 21 can be removed by the light emitted by the planar light emitting portion 60. As the planar light emitting unit 60, for example, a light emitting body or the like in which a plurality of LEDs are arranged in a planar manner and the entire surface emits light is applied. If the dark portion 21 disappears to the extent that the information contained in the display panels 3-1 and 3-2 can be transmitted by the illumination of the light of one LED, one LED is used instead of the planar light emitting portion 60. A light emitting unit may be provided.

(Means for removing dark areas on the display panel "Part 2")
As another means for removing dark areas, there is a means for using a wireless device 6b made of a material that transmits light. To manufacture the wireless device 6b from a material that allows light to pass through means, for example, to manufacture the housing that is a large area in the area occupied by the wireless device 6b and the substrate of the control unit from a material that allows light to pass through. By doing so, since the light from the LED 7 is transmitted, the dark portion 21 can be eliminated.

Even in this case, the light from the LED 7 is blocked by parts such as an antenna, wiring, and a circuit element to form a shadow, but the area occupied by these parts is small. Therefore, the region of the dark portion 21 generated by blocking the light from the LED 7 is also small, and the display panel 3-2 can be illuminated with sufficient brightness for transmitting information. Since the area of the substrate of the control unit of the wireless device 6b is small, if the area of the dark part 21 can be made sufficiently small by manufacturing only the housing with a material that allows light to pass through, only the housing is illuminated. May be made of a material that allows light to pass through.

Further, as shown in FIG. 13, a wireless device 6b manufactured of a material that transmits light is installed in close contact with the antireflection film 9b inside the display panel 3-2 in the vicinity of the center of the display panel 3-2. You may do so. By installing in this way, the reflected wave from the frame-shaped frame 2 is not generated, so that the interference wave 24 is generated as compared with the case where it is installed away from the antireflection film 9b as in the wireless device 6 shown in FIG. It can be suppressed. Hereinafter, the antireflection film 9b to which the wireless device 6b is in close contact is referred to as an antireflection film 9bb.

If the wireless device 6b is brought into close contact with the anti-reflection film 9bb as in Figure 13, the refractive index n _c2 of the antireflection film 9bb a refractive index n _c1 of the antireflection film 9f is determined as follows.

The refractive index n _c1 of the antireflection film 9f is the same value as the above-mentioned refractive index n _c , and when the refractive index of the outside air is n ₁ and the refractive index of the material of the display panel 3-2 is n ₂ , it is above. Based on the equation (1), it is defined as _{n c1} = (n ₁ × n ₂ ) ^1/2. _{On the other hand, the refractive index n c2} of the antireflection film 9bb to which the wireless device 6b is in close contact is based on the above equation (1) when the refractive index of the material that transmits light of the wireless device 6b is n _{3. Therefore} , it is defined as n c2 = (n ₂ × n ₃ ) ^1/2. The film thickness of both the antireflection films 9f and 9bb is an absolute value that is an odd multiple of 1/4 of the wavelength λ of the electromagnetic wave output by the wireless device 6b.

The difference refractive index n ₂ of the material of refractive index n ₃ and a display panel 3-2 of the material of the wireless device 6b, a part of the electromagnetic wave from being reflected at the joint surface of the wireless device 6b and the display panel 3-2. _{Further, due to the difference between the refractive index n 2} of the material of the display panel 3-2 and the refractive index n ₁ of the outside air, a part of the electromagnetic wave is reflected at the interface between the display panel 3-2 and the outside air. In this case, by attaching the antireflection films 9f and 9bb to the outside and the inside of the display panel 3-2, the joint surface between the wireless device 6b and the display panel 3-2 and the boundary surface between the display panel 3-2 and the outside air are attached. It is possible to suppress the reflection of electromagnetic waves in.

In the method of bringing the radio device 6b into close contact with the antireflection film 9bb, the radio device 6b may be attached to the antireflection film 9bb as if it were a suction cup, or light may be applied to the frame-shaped frame 2 and the support member 8. A jig made of a transparent material may be attached and pressed against the antireflection film 9bb, or other methods may be used.

As with the antireflection film 9b, the antireflection film 9bb may be attached to a part of the vicinity of the position of the wireless device 6b, or may be attached to the entire surface of the display panel 3-2. May be good.

(Means for suppressing dark areas generated on the display panel "Part 3")
As another dark portion removing means, a wireless device 6c as shown in FIG. 14 may be applied. The wireless device 6c includes a connection line 62 that connects the control unit 61, the antenna unit 63, the control unit 61, and the antenna unit 63. By applying this wireless device 6c, only the antenna unit 63 is installed near the center of the display panel 3-2, and the control unit 61 is installed in a place such as the lower part of the frame-shaped frame 2 that does not block the light from the LED 7. Then, the connecting wire 62 is wired along the support member 8. Even in this case, the antenna portion 63 blocks the light from the LED 7, but as described above, since the area occupied by the antenna portion 63 is small, the region of the dark portion 21 is also small, and the brightness is sufficient to transmit information. The display panel 3-2 can now be illuminated.

Further, in the configuration shown in FIG. 14, since the area occupied by the antenna unit 63 is smaller than that of the wireless device 6, the reflected wave generated by the display panel 3-2 described in FIG. 6 is further generated on the surface of the antenna unit 63. The reflected wave 25 due to the multiple reflections that are reflected is also reduced. Therefore, the position where the antenna unit 63 is installed may be a position separated from the display panel 3-2 by an absolute value that is an integral multiple of 1/2 of the wavelength λ, as in the case of the wireless device 6. It is not limited. Even if it is installed at another position, the reflected wave 25 itself is small, so that the interference wave generated by the reflected wave 25 is not increased.

(Means for suppressing dark areas on the display panel "Part 4")
As another dark portion removing means, as shown in FIG. 15, there is a means for attaching the reflecting plate 10 to the frame-shaped frame 2 and reflecting the light of the LED 7 by the reflecting plate 10 to remove the dark portion 21. The position where the reflector 10 is attached is, for example, a position as shown in FIGS. 16 and 17. According to the positional relationship shown in FIG. 16, the light from the LED 7 is reflected by the reflector 10, and the reflected light is incident on the space between the wireless device 6 and the display panel 3-2 to remove the dark portion 21. In the positional relationship shown in FIG. 17, the light from the LED 7 is reflected by the reflector 10, and the reflected light is further reflected or diffusely reflected on the surface of the wireless device 6 to remove the dark portion 21. In this case, the surface of the wireless device 6 is also used as a reflector.

As described above, it is assumed that the wireless device 6 is installed in a mixture of small cell base stations, IoT devices, wireless LAN access points, and other types having different materials, shapes, and performances. In the dark portion removing means for removing the dark portion 21 by using the reflector 10, it is not necessary to provide the wireless device 6 with a planar light emitting unit 60 or to manufacture the wireless device 6 with a material that transmits light. The dark portion removing means can remove the dark portion 21 generated on the display panel 3-2 regardless of the type of the wireless device 6 only by providing the reflector 10.

If one reflector is sufficient, one may be attached to the frame-shaped frame 2, or a plurality of reflectors 10 may be attached to the frame-shaped frame 2. The reflector 10 may be attached by combining the configurations of FIGS. 16 and 17. The position where the reflector 10 is attached may be any place inside the internally illuminated signboard 1 as long as the reflector 10 does not generate a new dark part. However, when the reflector 10 is an electromagnetic wave reflecting member, it is installed at a position away from the wireless device 6 so as not to increase the reflected wave.

Further, as the reflector 10, for example, a mirror or a white plate is applied, but any reflector may be used as long as it reflects light. In the case of FIG. 17, any material may be used as the material of the housing of the wireless device 6 as long as it reflects light.

(simulation result)
18 to 20 are diagrams showing simulation results of the electrolytic strength of the electromagnetic wave output by the wireless device 6. In both cases, the refractive index n ₁ and the dielectric constant ε ₁ of the outside air are n ₁ = 1 and ε ₁ = 1, respectively, and the refractive index n ₂ and the dielectric constant ε _{2 of} the display panel 3-2 are n, respectively. ₂ = 1.49, ε ₂ = 2.2201, and the refractive indexes n _c1 and the dielectric constant ε _{c1 of the} antireflection films 9f and 9b are n _c1 = 1.22 and ε _c1 = 1.4884, respectively.

FIG. 18 shows the wireless device 6 in the case where the wireless device 6 is installed apart from the frame-shaped frame 2 and the support member 8 and the antireflection films 9f and 9b are applied in the internally illuminated signboard 1. It is a figure which shows the electrolytic strength of the electromagnetic wave output by. FIG. 19 is a diagram showing the electrolytic intensity of electromagnetic waves output by the wireless device 6 when the antireflection films 9f and 9b are not applied in the configuration shown in FIG. Comparing the electrolytic intensities of FIGS. 18 and 19, the interference fringes existing when the antireflection films 9f and 9b shown in FIG. 19 were not applied were removed by applying the antireflection films 9f and 9b. You can see that there is.

FIG. 20 is a diagram showing a configuration example when the wireless device 6 is installed close to the frame-shaped frame 2 and the support member 8. FIG. 21 is a diagram showing the electrolytic intensity of electromagnetic waves output by the wireless device 6 when the antireflection films 9f and 9b are not applied in the configuration example of FIG. 20. As shown in FIG. 21, when the electrolytic strength in the case of the positional relationship of FIG. 20 and the electric strength under the condition without the antireflection films 9f and 9b of FIG. 19 are compared, in FIG. 21, the wireless device 6 has a frame shape. Since it is close to the frame 2, many interference fringes are generated inside and outside the display panel 3-2. Further, in the vicinity of the support member 8, the disturbance of the electrolytic strength due to the interference fringes is particularly strong. Therefore, it can be seen that the interference wave 24 can be suppressed depending on the position where the wireless device 6 is installed.

In the configuration of the above embodiment, the internally illuminated signboard 1 includes a frame-shaped frame 2 having an opening, a support member 8 for supporting the frame-shaped frame 2, and display panels 3-1 and 3-that close the opening. 2 and the LED 7 attached to the support member 8 and the position in the frame-shaped frame 2 that outputs an electromagnetic wave of wavelength λ and is separated from the display panel 3-2 by an absolute value that is an integral multiple of 1/2 of the wavelength λ. It is equipped with a wireless device 6 installed in. The internally illuminated signboard 1 is further provided with a dark portion removing means for removing the dark portion by irradiating the dark portion generated on the display panel 3-2 by blocking the light from the LED 7 by the wireless device 6. Antireflection films 9f and 9b having an absolute value thickness of an odd multiple of λ / 4 and having a predetermined refractive index that suppresses the reflection of electromagnetic waves are attached to the surface of the display panel 3-2. Therefore, when the wireless device 6 is installed inside the internally illuminated signboard 1, the dark portion removing means does not generate a dark portion on the display panel 3-2, and the antireflection films 9f and 9b prevent unnecessary electromagnetic waves from being reflected. It is possible to prevent the occurrence. Therefore, by removing the dark portion, the information displayed on the display panel 3-2 can be accurately transmitted. In addition, by preventing the generation of reflected waves, it is possible to prevent a decrease in transmitted power, and it is possible to suppress the generation of interference waves generated due to reflected waves, so that a decrease in reception level can also be prevented. ..

In the above embodiment, power is supplied to the wireless devices 6, 6a, 6b, and 6c by the power line, but power may be supplied by the battery.
Further, in the above embodiment, the LED 7 is applied as a light source, but a fluorescent lamp may be used, or a light source other than the LED or the fluorescent lamp may be used.
Further, the wireless device 6a, the wireless device 6b, the wireless device 6c, and the reflector 10 of the dark portion removing means in the above embodiment may be used in combination.

Further, in the above embodiment, the wireless devices 6, 6a, 6b, and 6c are installed near the center of the display panel 3-2 as shown in FIG. 4, but some reflection caused by the frame-shaped frame 2 is generated. If the wave 20 is allowed, it may be installed at a position other than the vicinity of the center of the display panel 3-2.

Further, in the above embodiment, the reflected wave 25 is further suppressed by attaching both of the antireflection films 9f and 9b or both of the antireflection films 9f and 9bb rather than attaching them. However, the configuration of the present invention is not limited to the embodiment. If it is possible to sufficiently suppress the reflected wave 25 by attaching only one of the outer side or the inner side, only one of them may be attached.

Further, in the above embodiment, the antireflection films 9f, 9b, 9bb are attached to the display panel 3-2. Further, in the case of the multilayer shown in FIG. 11, the antireflection films 9f-1 and 9b-1 are attached to the display panel 3-2, and the antireflection films 9f-2 to 9fm and 9b-2 to 9b-m are attached. Is to be affixed to other layers. However, the configuration of the present invention is not limited to the embodiment, and the film-like structure is not attached, but is provided on the display panel 3-2 by chemical or optical means. May be good.

FIG. 22 is a perspective view of an internally illuminated lighting device 1a which is an example of another embodiment of the internally illuminated light source device of the present invention, and FIG. 23 shows the internally illuminated lighting device 1a of FIG. 22 as shown by an arrow C. It is a cross-sectional view seen from a direction. In the internally illuminated lighting device 1a, the box-shaped frame 2a is a rectangular parallelepiped-shaped housing body formed of, for example, an electromagnetic wave reflecting member made of a metal such as aluminum, and one of the six rectangular parallelepiped-shaped surfaces is open. It has a shaped shape. The box-shaped frame 2a is provided with two fluorescent tubes 7a, and emits light by receiving electric power from a power supply line (not shown) laid through a power supply pipeline.

The glove 3a is a light transmitting member and is attached so as to close the opening of the box-shaped frame 2a. As shown in FIG. 23, the wireless device 6 is installed in the space between the fluorescent tube 7a and the globe 3a, and is laid through the same power line as the power line that supplies power to the fluorescent tube 7a through the power line 5a. It receives power and outputs electromagnetic waves of wireless signals. The illumination reflector 11 is a concave reflector that reflects the light emitted by the fluorescent tube 7a in the direction opposite to that of the globe 3a in the direction of the globe 3a. The illumination reflector 11 is formed of an electromagnetic wave reflecting member like the box-shaped frame 2a, and is attached to the box-shaped frame 2a, one for each fluorescent tube 7a.

As with the internally illuminated signboard 1, the antireflection films 9f and 9b are attached to the glove 3a, and the reflected wave 25 is suppressed by multiple reflections between the glove 3a and the wireless device 6. The antireflection films 9f and 9b to be attached may have a multi-layer structure shown in FIG. Further, in order to suppress the generation of the reflected wave 20 by the box-shaped frame 2a and the lighting reflector 11, the wireless device 6 is located away from the box-shaped frame 2a and the lighting reflector 11 as in the internally illuminated signboard 1. Will be installed in.

Further, when a dark portion is generated in the globe 3a by the wireless device 6, in order to remove the dark portion, a wireless device 6a having a planar light emitting unit 60, a wireless device 6b manufactured of a member that transmits light, and a control unit are used. The wireless device 6c in which the 61 and the antenna unit 63 are separated will be applied. Further, the reflector 10 described with reference to FIGS. 15 to 17 may be attached to the internally illuminated lighting device 1a to remove the dark portion.

The internally illuminated light source device is not limited to the internally illuminated signboard 1 and the internally illuminated lighting device 1a described above, and may be, for example, a traffic light installed in the city.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes designs and the like within a range that does not deviate from the gist of the present invention.

1 ... Internally illuminated signboard, 2 ... Frame-shaped frame, 3-1, 3-2 ... Display panel, 4 ... Mounting member, 5 ... Power line, 6 ... Wireless device, 7 ... LED, 8 ... Support member, 9f, 9b ... Antireflection film

Claims (2)

It is a method of installing a wireless device in an accommodation body which is composed of an electromagnetic wave reflecting member that reflects electromagnetic waves and a light transmitting member that transmits light and has a light source and a wireless device inside.
The wireless device has a light emitting surface that emits light.
The light emitting surface of the wireless device is arranged so as to face the direction of the light transmitting member.
The wavelength of the frequency to be used is λ, and an antireflection film having a predetermined refractive index whose film thickness is an odd multiple of λ / 4 is formed as a single layer on a part or the whole of the inside and outside of the light transmitting member. A method of installing wireless devices in multiple layers. Inside, which is composed of an electromagnetic wave reflecting member that reflects electromagnetic waves and a light transmitting member that transmits light.
A light source that irradiates light and
A wireless device with a light emitting surface that emits light,
With
The light emitting surface of the wireless device is arranged so as to face the direction of the light transmitting member.
The antireflection film having a predetermined refractive index whose film thickness is an odd multiple of λ / 4, where the wavelength of the frequency to be used is λ, is a single layer or a part or the whole of the inside and the outside of the light transmitting member. A multi-layered housing.

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