JP2010176233A - Light device, traffic signal light device and antireflecting unit for light device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel light device, traffic signal light device and antireflecting unit that obviates the need for a mast for mounting antenna without spoiling the view of roads. <P>SOLUTION: The traffic signal light device includes: an optical unit 104 having a light guide plate 310 planarly emitting light incident from a side face, and a light emitter 303 disposed at the side face of the light guide plate; and a patch antenna 106, where a patch element 305 and a ground element 306 are arranged in the optical unit 104, the patch element 305 is disposed in the rear of the light guide plate 310, and the ground element 306 is disposed in the rear of the patch element 305. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lamp, a traffic signal lamp, and an antireflection unit for the lamp.

  In recent years, an Intelligent Transport System (ITS) has been proposed for the purpose of promoting traffic safety and preventing traffic accidents. In this ITS, a communication device (infrastructure device) is installed on the road, and the information emitted from the antenna of this communication device is received by the in-vehicle device of the vehicle traveling on the road, and this information is utilized, It is possible to improve the safety of traveling of the vehicle (see Patent Document 1).

  When such road-to-vehicle communication is performed wirelessly, from the viewpoint of securing the prospect of wireless communication, an arm is extended from the column installed on the sidewalk or the like to the roadway side, and the antenna of the communication device is mounted on this arm. Further, when the line of sight can be secured without providing the arm, an antenna can be attached to the support column.

Japanese Patent No. 2806801

In order to install the antenna of the communication apparatus on the road, it is not economical to provide a new support for the antenna, and it is not preferable from the viewpoint of the aesthetics of the road.
Therefore, since vehicle detectors, optical beacon heads, and the like are installed on the road, it is conceivable that an antenna is provided alongside a column or arm to which these are attached. However, even in this case, it is not preferable in terms of aesthetics.

  Accordingly, it is an object of the present invention to provide a new technical means that does not require an antenna support column and does not impair the beauty of roads and the like.

A lamp provided from one aspect of the present invention includes a light guide plate that emits incident light from a side end face in a planar shape, an optical unit having a light emitter disposed on the side end face of the light guide plate, a patch element, and a ground. An element is provided in the optical unit, a patch element is disposed behind the light guide plate, and a ground element is provided behind the patch element.
In this lamp, since the patch antenna is stored in the optical unit, the patch antenna can be made inconspicuous, and a post dedicated to antenna installation can be eliminated.

  Furthermore, it is preferable that the ground element and the patch element, particularly the patch element, be provided in front of the substrate so that the substrate does not hinder the transmission and reception of radio waves by the patch antenna. In order for this patch antenna to exhibit desired performance, it is necessary to provide a predetermined interval between the patch element and the ground element.

  However, since the light emitters disposed on the substrate are shorter in the front-rear direction than the interval, the patch element is positioned in front of the front end of the light emitter. As a result, the patch element may interfere with the lamp light from the light emitter. Even if the patch element is provided so that the lamp light can be seen well from outside the lamp in a specific direction such as in front of the lamp, it is difficult to provide an optical path so as not to disturb the lamp in other directions.

  On the other hand, when the patch element is arranged behind the front end of the light emitter so that the patch element does not interfere with the lamp light from the light emitter, the length of the light emitter in the front-rear direction is short. The distance between the ground element and the patch element in the front-rear direction can be set only with a small value, and the patch antenna may not be able to exhibit desired performance.

  Therefore, in this lamp, a planar lamp light is formed in front of the patch element using a light guide plate. Since the planar lamp light is formed in front of the patch element, the patch element does not interfere with the lamp light, and a desired light distribution characteristic can be obtained. Further, a patch element is disposed behind the light guide plate, and a light emitter is provided on a side end surface of the light guide plate. For example, a patch antenna is disposed at the center of the optical unit, and a light emitter is disposed along the inner edge of the optical unit. Thereby, since the light emitter is arranged avoiding the front of the patch antenna, it is possible to prevent the substrate of the light emitter from obstructing the transmission and reception of radio waves by the patch antenna. In addition, since the distance between the patch element and the ground element is not limited by the configuration of the length of the light emitter, etc., it is possible to ensure the degree of freedom in designing to provide the necessary distance, and exhibit the desired performance for the patch antenna. It becomes possible to make it.

The lamp provided from another aspect of the present invention includes a light emitter, a visible light transmissive cover member disposed on the front surface, and a lamp light disposed on the rear side of the light emitter to transmit light from the light emitter. An optical unit having a reflecting plate that reflects in a direction, and a patch antenna in which a patch element and a ground element are provided between the cover member and the reflecting plate, and the patch element is disposed in front of the ground element. Prepare.
Also in this lamp, since the patch antenna is stored in the optical unit, the patch antenna can be made inconspicuous, and a post dedicated to antenna installation can be eliminated. Further, even in this lamp, the distance between the patch element and the ground element is not limited by the configuration of the length of the light emitter, etc., so that the degree of freedom in design for providing the necessary distance can be secured, and the patch antenna It becomes possible to exhibit desired performance. Further, the light distribution of the lamp can be adjusted by appropriately determining the positional relationship between the light emitter and the reflector, the shape of the reflector, and the like, and as a result, desired light distribution characteristics can be obtained.

  In still another aspect of the present invention, an optical unit having a light guide plate that emits incident light from a side end face in a planar shape, a light emitter disposed on the side end face of the light guide plate, a patch element, and a ground element are Provided is a traffic signal lamp provided in an optical unit, the patch element being arranged behind the light guide plate, and the ground element being arranged behind the patch element.

  In this traffic signal lamp, since the patch antenna is stored in the optical unit, the patch antenna can be made inconspicuous, and a support column dedicated to antenna installation can be eliminated. Moreover, the patch antenna can exhibit desired performance while realizing the light distribution characteristics required for the traffic signal lamp as described above.

  According to the present invention, it is possible to eliminate the need for an antenna support column, and the appearance of a road or the like is not impaired.

It is a figure which shows the whole structure of the traffic signal lamp device which concerns on this Embodiment. It is a figure which shows an example of the light distribution characteristic calculated | required by the traffic signal lamp device. It is a perspective view which shows an example of the external appearance of an optical unit. 6 is a chart showing the relationship between the relative dielectric constant of a dielectric, the outer shape of the patch element, the position of the patch element, and the like. It is sectional drawing of an example of the optical unit which incorporated the antenna. It is sectional drawing which concerns on another example of an optical unit. It is a figure which shows typically the cross section of the optical unit which concerns on another example. It is a figure which shows typically the cross section of the optical unit which concerns on another example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the present invention is embodied as a traffic signal lamp device including an optical unit having a plurality of light emitting diodes as a light emitter.

  FIG. 1 is a diagram showing an overall configuration of a traffic signal lamp according to the present embodiment. The traffic signal lamp 101 is a vehicle lamp installed on a road. The signal lamp 101 is attached to a column 102 provided on the side of a sidewalk or the like. An arm 103 is provided on the upper side of the support column 102 so as to project toward the roadway side. The signal lamp 101 is attached to the tip of the arm 103 so that it can be seen from a vehicle traveling on the roadway.

  The signal lamp device 101 includes a plurality (three in the illustrated example) of optical units 104 and a housing 105 in which these optical units 104 are incorporated. The three optical units 104 each store a plurality of light emitting diodes (hereinafter referred to as LEDs) as light sources, and have red, yellow, and blue lamp colors. Furthermore, in the present embodiment, each lamp color optical unit 104 stores a patch antenna 106 for road-to-vehicle communication. By storing the patch antenna 106 in the optical unit 104, there is no need for a post dedicated to the antenna, whereby the aesthetic appearance of the road is not impaired. In addition, the installation structure of the signal lamp device 101 may be other than that illustrated, and the form of the support column 102 and the arm 103 may be different. The signal lamp 101 may be constructed on a pedestrian bridge.

  A control device 107 is also attached to the column 102. In this embodiment, the control device 107 controls lighting and the like of each optical unit 104 and also controls wireless communication by the patch antenna 106. The control device 107 is connected to the patch antenna 106 in the optical unit 104 by a coaxial cable 108. Further, a lamp line for flowing the LED drive current is also laid between the control device 107 and the optical unit 104. However, it is not necessary to perform both the display control of the signal lamp 101 and the wireless communication control by the control device 107, and both controls may be performed by separate devices. Further, the control device may be built in the housing 105 of the signal lamp device 101.

  FIG. 2 is a diagram showing an example of light distribution characteristics required for a traffic signal lamp. The traffic light of the traffic signal lamp needs to be sufficiently visible not only from a distant vehicle but also from the nearest vehicle that is about to pass through the intersection. For this reason, the optical unit of the traffic signal lamp is required not only to have a relatively high luminous intensity in the front direction but also to have a certain degree of luminous intensity obliquely downward. In this example, in addition to a relatively high luminous intensity of 288 cd on the center line, a luminous intensity of 3.6 cd is also required at 33 ° vertically below.

  3A and 3B are cross-sectional views illustrating an example of an optical unit with a built-in antenna. The optical unit 104 includes a cover member 301 and a housing member 302. The cover member 301 is a glass or resin member having visible light permeability, and covers the front surface of the optical unit 104. The optical unit 104 emits lamp light through the cover member 301. The accommodating member 302 is a dish-shaped member formed of a steel plate, aluminum, or a synthetic resin material, and has a bottom portion (bottom wall) 302a and a side portion (side wall) 302b erected from the periphery of the bottom wall 302a. ing. A cover member 301 is detachably attached to the inner periphery of the opening of the housing member 302. The optical unit 104 accommodates the patch antenna 106, the LED 303 serving as a light source, the substrate 304 on which the LED is mounted, and the like in a space surrounded by the cover member 301 and the housing member 302.

  The patch antenna 106 includes a patch element 305 and a ground element 306. In this embodiment, both the patch element 305 and the ground element 306 are attached to a support plate 307 disposed at the bottom of the cover member 301. The support plate 307 is a plate material made of a synthetic resin material made of an insulating material (non-conductor). The patch element 305 can be attached to the rear surface of the support plate 307 by a fastener including a bolt and a nut, not shown. The ground element 306 is fixed to a boss formed on the rear surface of the support plate 307 with a screw. As a result, the ground element 306 is disposed behind the lamp device with respect to the patch element 305, and a desired interval is ensured between the patch element 305 and the ground element 306.

  The patch element 305 and the ground element 306 can be formed in a circular flat plate shape. Here, the outline shape of the ground element 306 is larger than that of the patch element 305. The planar shape of the ground element 305 is not limited to a circle, and may be another shape such as a rectangle. However, when the optical unit 104 is circular in front view, the ground element 306 is also preferably circular. In other words, it is preferable that the optical unit 104 and the ground element 306 have the same contour shape (similar shape). This is because the area of the ground element 306 can be increased (maximized) when the outline shape of the ground element 306 is circular rather than rectangular. Further, by making the area of the ground element 306 larger (to some extent) than that of the patch element 305, it is possible to reduce the emission of radio waves to the ground element 306 (back direction). That is, the radio wave can be efficiently emitted forward. Also, the planar shape of the patch element 305 may be other shapes such as a rectangle.

  Between the patch element 305 and the ground element 306, a dielectric (dielectric member) having a relative dielectric constant greater than that of air may be interposed, or air may be interposed without the dielectric. Good. A dielectric may be inserted between all or part of the patch element 305 and the ground element 306. The dielectric is a plate member made of resin or ceramics, for example. In the case of resin, fluororesin, polyethylene, glass epoxy, FRP, polyacetal, ABS resin, or polyethylene terephthalate can be used as the dielectric.

  The patch element 305 and the ground element 306 may have a mesh structure or a mesh structure. In the case of the mesh structure, the patch element 305 and the ground element 306 are formed by conducting wires (knitting the conducting wires).

  The plurality of LEDs 303 and the substrate 304 are arranged so as to avoid the front surface of the patch antenna 106. In this embodiment, each LED 303 and the substrate 304 are arranged in an annular shape along the inner wall surface (inner edge) of the cover member 301. The inner diameter of the ring is larger than the diameter of the patch antenna 106 (the diameter of the ground element 306). From the viewpoint of the patch antenna 106, the substrate 304 of the LED 303 becomes a conductor plate. However, since the substrate 304 is disposed so as to avoid the front surface of the patch antenna 106 at the center of the optical unit 104, transmission / reception of radio waves by the patch antenna 106 is not prevented by the substrate 304. Further, by arranging the LED 303 and the substrate 304 in an annular shape, the distance between the patch element 305 and the ground element 306 is not limited by the LED 303 or the substrate 304. Therefore, even in the optical unit 104, the interval necessary for the patch antenna 106 to exhibit the desired performance can be easily secured.

  When the signal lamp storing the patch antenna 106 is used in an intelligent road traffic system (ITS) that performs wireless communication between road vehicles, the frequency used by the patch antenna 106 is set to a 700 MHz band frequency (715 MHz to 725 MHz). In order to provide the patch antenna with this antenna performance (band characteristic, VSWR characteristic), it is necessary to set a wide interval in the front-rear direction between the patch element 305 and the ground element 306. For example, when the patch element 305 has a square shape, one side of which is about 170 mm, and a dielectric having a dielectric constant larger than that of air is provided between the patch element 305 and the ground element 306, the patch element 305 and the ground element 306 are arranged before and after. The interval in the direction is set to approximately 20 mm to 40 mm. This interval is set according to the presence or absence of a dielectric and the type of dielectric. Thus, in order to use the patch element 305 and the ground element 305 at a 700 MHz band frequency, it is necessary to ensure a relatively large value as the interval. However, by arranging the plurality of LEDs 303 and the substrate 304 in an annular shape as described above, the distance between the patch element 305 and the ground element 306 is not limited by the LED 303 and the substrate 304. For this reason, even when a signal lamp device in which the patch antenna 105 is stored in the optical unit 104 is used for ITS, there is no restriction on the lamp light between the patch element 305 and the ground element 306, and the patch antenna 106 has a desired performance. It becomes easy to show.

  As shown in FIG. 3B, the patch antenna 106 is connected to the control device via the coaxial cable 108. The coaxial cable 108 includes an inner conductor 108a, an insulator 108b, an outer conductor 108c, and a covering portion 108d. The inner conductor 108a is connected to the patch element 305, and the outer conductor 108c is connected to the ground element 306. The coaxial cable 108 is drawn into the optical unit 104 via a mounting portion 308 provided on the bottom surface 302 a of the housing member 302.

  In the optical unit 104, the LED 303 has a bullet-shaped mold, and its optical axis is attached to the substrate 304 toward the central axis of the optical unit 104. The substrate 304 is attached to a support member 309 provided along the inner wall surface of the cover member 301. The support member 309 is formed by integrally forming a planar support portion 309 a that contacts the back surface of the mounting surface of the substrate 304 and an end surface support portion 309 b that contacts the side end surface of the substrate 304. The substrate 304 is fixed to the flat surface support portion 309a and the end surface support portion 309b with screws, an adhesive, or the like. The end surface support portion 309b also serves as a hook for hiding the LED 303 and the substrate 304 from the front. By limiting the sunlight from the West or Asahi to the reflecting mirror in the LED 303 and the front of the board, the signal lamp becomes difficult to see due to reflection by the reflecting mirror or the board, or the signal lamp that is not lit This is for the purpose of preventing the occurrence of “pseudo lighting” in which the device appears to be lit. Further, by concealing the LED 303 with a broom, sunlight does not directly hit the LED 303, so that the deterioration of the LED 303 can be prevented, and as a result, the life of the LED 303 can be extended.

  Two lead wires of the LED 303 are inserted into the substrate 304 and connected to a wiring pattern provided on the back surface of the substrate 304. A drive current is supplied to the LED 303 through the wiring pattern and the lamp line described above, and the LED 303 emits light. The bullet-shaped mold of the LED 303 forms a lens, and the LED 303 emits directional lamp light toward the central axis of the optical unit 104. The plurality of LEDs 303 can be arranged in an annular shape as described above. However, it may be arranged like a polygonal outline, for example.

  A light guide plate 310 is disposed in the optical axis direction of each LED 303. The lamp light from the LED 303 enters the light guide plate 310. The light guide plate 310 emits incident light from the side end surface 310a in a planar shape in front of the signal lamp. In this embodiment, the light guide plate 310 is formed in a bowl shape, and its convex surface is directed forward. However, the shape of the light guide plate 310 may be other shapes such as a circular flat plate shape.

  The light guide plate 310 is disposed in front of the patch element 305. For the light guide plate 310, an insulating member (non-conductor), for example, an acrylic plate is used. For this reason, the light guide plate 310 does not hinder the transmission and reception of radio waves by the patch antenna 106. For example, a white reflective sheet 310b is attached to the surface of the light guide plate 310 on the patch element 305 side. The light from the LED 303 travels in the light guide plate 310 while being reflected between the reflection sheet 310b of the light guide plate 310 and the exit surface 310c. The reflection sheet 310b scatters and reflects the light. As a result, a component having an incident angle smaller than the total reflection angle is emitted from the emission surface 310c. As a result, the lamp light is uniformly emitted from the emission surface 310c. The lamp light emitted from the emission surface 310 c goes out of the optical unit 104 through the cover member 301. This lamp is visible.

  As described above, if the patch antenna 106 is arranged behind the light guide plate 310, the light distribution characteristics of the lamp light are not limited to the configuration of the patch antenna 106 built in the optical unit 104. Therefore, even if the patch antenna 106 is built in the optical unit 104, a high degree of freedom is obtained with respect to the light distribution characteristics of the signal lamp. As a result, for example, as shown in FIG. 2, an arrangement suitable for a traffic signal lamp that requires a relatively high luminous intensity in the central axis direction of the optical unit 104 and at the same time requires a constant luminous intensity in an obliquely downward direction. Optical characteristics can be realized.

  Further, in the signal lamp in the present embodiment, the patch element 305 and the ground element 306 are arranged facing each other in the front-rear direction. For this reason, the directivity of the patch antenna 106 can be given ahead of the signal lamp. Thereby, the central axis of the optical unit 104 and the directivity of the patch antenna 106 substantially coincide. Since the signal lamp is installed at a position where the line of sight is good with respect to the vehicle, a good communication state with the vehicle-mounted device of the vehicle can be obtained by the antenna directivity. Therefore, the patch antenna 106 incorporated in the optical unit 104 of the signal lamp can be easily used for ITS that performs wireless communication between road vehicles.

  FIG. 4 is a chart showing the relationship between the relative dielectric constant εr of the dielectric disposed between the ground element and the patch element, the outer shape of the patch element, the position of the patch element, and the like. This table shows the result of modeling and modeling the signal lamp used in the 720 MHz band. In this modeling, the patch element and the ground element are made circular, and the LED, the LED insertion hole and the antireflection member are omitted because they have little influence on the element outer shape and the element position. Further, the input portion of the coaxial cable is positioned 1 mm downward from the center upper end of the patch element.

  In FIG. 4, the element outer shape indicates the length of one side of the ground element and the patch element that are square, and the element height indicates the value of the distance between the ground element and the patch element in the front-rear direction. When the relative dielectric constant εr is 1, that is, when the space between the ground element and the patch element is air, the element outer shape is 170.5 mm and the element height is 25.0 mm. When a dielectric having a larger rate εr than that of air is interposed, the outer shape of the element is reduced and the height of the element is increased.

  Thus, the size of the patch element (patch antenna) can be reduced by providing the dielectric having a relative dielectric constant εr larger than that of air between the ground element and the patch element. This is considered to be because the wavelength shortening rate in the element increases. Thus, since the patch antenna can be made small, another antenna can be further stored in the optical unit. As another antenna, for example, it may be used in a frequency band (for example, 2.4 GHz band or the like) for communication between mobile phones and ITS roads.

  In addition, it is preferable that the lower limit of the dielectric constant εr of the dielectric for the patch antenna stored in the lamp is 2 (2 or more). The relative dielectric constant εr is preferably 5 (up to 5). Specifically, fluororesin, polyethylene, glass epoxy, FRP, polyacetal, ABS resin, or polyethylene terephthalate is preferable in terms of price and workability.

  FIG. 5 is a cross-sectional view according to another example of the optical unit. In the example of FIG. 3, the patch antenna 106 is provided behind the support plate 307 in the optical unit 104, but the arrangement of the patch antenna 106 is not limited to this. As in the example of FIG. 5, the patch antenna 106 may be attached to the bottom surface 302 a of the housing member 302 without using the support plate 307. In this case, the light guide plate 310 may not be provided with a reflection sheet, and the light leaking from the surface of the light guide plate 310 on the patch antenna 106 side may be reflected by the patch antenna 106 or the like. It may be pasted on the back side, and the light traveling through the light guide plate 310 may be reflected by the patch element 305. In this example, a dielectric 501 is provided between the patch element 305 and the ground element 306.

  FIG. 6 is a diagram schematically showing a cross section of an optical unit according to another example. The optical unit 104 according to this example emits the lamp light from the LED 303 to the front of the signal lamp by using the reflection plate 601 without using the light guide plate. In the optical unit 104, the LED 303 is directed rearward. The reflector 601 is disposed behind the LED 303 and reflects the lamp light from the LED 303 toward the cover member 301. Here, the reflection plate 601 is formed in a bowl shape, and the inner surface thereof is disposed in front of the signal lamp. By appropriately determining the positional relationship between the LED 303 and the reflection plate 601, the shape of the reflection plate 601, and the like, the light distribution of the lamp light can be adjusted. For this reason, even if the patch antenna 106 is provided in the optical unit 104, the light distribution characteristic necessary for the signal lamp as shown in FIG. 2 can be obtained.

  In the optical unit 104, the patch element 305 and the ground element 306 are disposed between the cover member 301 and the reflection plate 601. Here, the LED 303 is disposed behind the ground element 306. Since the distance between the patch element 305 and the ground element 306 is not limited by the configuration of the total length of the LED 303 and the like, it is possible to secure a degree of freedom in designing to provide the necessary distance, and as a result, the patch antenna 106 has a desired performance. Can be exhibited. In addition, by using the reflector 601, it is possible to easily adopt a configuration in which the LED 303 is disposed avoiding the front of the patch element 305, so that the substrate of the LED 303 does not interfere with transmission / reception of radio waves by the patch antenna 106. be able to. Note that the patch element 305 and the ground element 306 can have a mesh structure or a mesh structure in order to secure a light amount in a portion of the patch antenna 106.

  FIG. 7 is a diagram schematically showing a cross section of an optical unit according to another example. The optical unit 104 according to this example also emits the lamp light from the LED 303 to the front of the lamp. The optical unit 104 according to this example uses the ground element 306 of the patch antenna 106 as a reflector instead of using a dedicated reflector to reflect the lamp light from the LED 303. Further, in this example, the LED 303 is directed rearward, so that the lamp light is not incident on the reflector behind the LED 303, and the light from the LED 303 directed forward is reflected backward, thereby forming a ground element that becomes a reflector. Lamp light is incident on 306. Here, the patch element 305 of the patch antenna 106 is used to diffusely reflect light from the LED 303 directed forward. Thus, by once diffusely reflecting the lamp light in front of the LED 303, the number of necessary LEDs 303 can be reduced as compared with the example of FIG.

  FIG. 8 is a diagram schematically showing a cross section of an optical unit according to another example. The optical unit 104 according to this example reflects the lamp light from the LED 303 by the patch element 305 and emits it forward of the lamp. The patch element 305 may be processed so as to easily scatter lamp light in a range that does not affect radio wave transmission / reception performance. In this case as well, the configuration such as the total length of the LED 303 is not limited, and the patch antenna 106 can exhibit a desired performance, and the substrate of the LED 303 does not hinder the transmission and reception of radio waves by the patch antenna 106. Further, since the lamp light of the LED 303 is reflected in front of the patch antenna 106 and emitted to the front of the lamp, the patch antenna 106 does not disturb the lamp light, and a desired light distribution characteristic can be obtained.

  In the signal lamp in the present embodiment as described above, the patch antenna is stored in the optical unit. As a result, the antenna can be made inconspicuous and installed in the signal lamp, and the aesthetic appearance of the road is not impaired. And since an antenna is stored in an optical unit, the exclusive support | pillar for antenna installation can be made unnecessary. In addition, since the substrate is disposed away from the front of the antenna, it is possible to avoid the substrate from interfering with transmission / reception of radio waves by the antenna.

  Further, in order to use the patch antenna at a 700 MHz band frequency (715 MHz to 725 MHz), the distance in the front-rear direction between the patch element and the ground element is set to a predetermined value (for example, 20 mm to 40 mm). Even when such a patch antenna is stored in the optical unit, according to the present embodiment, the light distribution from the LED can be obtained by the light guide plate or the reflection plate. Therefore, the patch antenna can easily function as an antenna for communicating at a 700 MHz band frequency.

  The embodiments described above do not limit the technical scope of the present invention, and various modifications and applications other than those already described are possible within the scope of the present invention.

  Although the patch element and the ground element may be arranged in parallel as shown in FIGS. 3 and 4, one or both of the ground element and the patch element are provided in the optical unit in order to adjust the antenna directivity. It may be inclined and arranged. Moreover, you may provide LED between a patch element and a ground element.

  In the above-described embodiment, the patch antenna is incorporated in each lamp color optical unit. However, a patch antenna may be built in some lamp color optical units. When a patch antenna is incorporated in a plurality or all of the light-colored optical units, it may be used as a diversity antenna, or may be used as an array antenna to improve gain or change directivity. Good.

  Further, the signal lamp may be for a pedestrian other than the vehicle. Further, the light emitter included in the signal lamp may be a light bulb or an organic EL element in addition to the LED. Moreover, this invention may be an illuminating lamp for road illumination other than a signal lamp. In this case, there are mercury lamps and sodium lamps as light emitters.

  The lamp and the antireflection unit according to the present invention do not require a support for installing an antenna, and do not impair the aesthetics of the road. Signal lamps for vehicles and pedestrians and illumination lamps for illumination, It is useful for other lamps and antireflection units used for them.

DESCRIPTION OF SYMBOLS 101 Traffic light lamp 102 Support | pillar 103 Arm 104 Optical unit 105 Case 106 Patch antenna 107 Control apparatus 108 Coaxial cable 301 Cover member 302 Housing member 302a Bottom of housing member 302b Side of housing member 303 LED
304 Substrate 305 Patch element 306 Ground element 307 Support plate 308 Mounting portion 309 LED substrate support member 310 Light guide plate 501 Dielectric 601 Reflector

Claims (4)

An optical unit having a light guide plate that emits incident light from the side end face in a planar shape, and a light emitter disposed on the side end face of the light guide plate;
A lamp device comprising: a patch antenna in which a patch element and a ground element are provided in the optical unit, the patch element is disposed behind the light guide plate, and the ground element is disposed behind the patch element. The light emitter is disposed along an inner edge of the optical unit;
The lamp device according to claim 1, wherein the patch antenna is disposed in a central portion of the optical unit. An optical unit having a light emitter, a visible light transmissive cover member disposed on the front surface, and a reflector disposed behind the light emitter and reflecting the lamp light from the light emitter toward the cover member;
A lamp device comprising: a patch antenna in which a patch element and a ground element are provided between the cover member and the reflector, and the patch element is disposed in front of the ground element. An optical unit having a light guide plate that emits incident light from the side end face in a planar shape, and a light emitter disposed on the side end face of the light guide plate;
A traffic signal lamp comprising: a patch element and a ground element provided in the optical unit; the patch element disposed behind the light guide plate; and the patch antenna disposed behind the patch element. .

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