JP6578337B2 - traffic lights - Google Patents

Description

  The present invention relates to a traffic light that can exhibit good visibility even when installed in a snowfall area.

  In snowfall areas, the visibility of traffic lights may be hindered by snow adhering to traffic lights, causing traffic accidents. Particularly in recent years, traffic lights (so-called LED traffic lights) using power-saving light-emitting diodes as signal light sources have become widespread, and problems due to snow on the traffic lights have become more obvious. This is because the LED traffic light has the disadvantage that the lamp is less likely to become hot and the snow attached to the periphery of the lamp is less likely to melt compared to previous traffic lights that used a light bulb as the signal light source (lamp). Because it is.

  In view of such a situation, the inventor covers the light source plate 10 (lamp) for emitting signal light forward and the front side of the lamp 10 as shown in FIG. It is a traffic light equipped with the translucent panel 20 and the heating means 30 which heats the translucent panel 20, Comprising: While providing the thermal storage layer 21 in the translucent panel 20, the lamp device 10 is equipped with many light sources 11 ( It has already been proposed that the heating wires 31 constituting the heating means 30 are arranged in a state where the gap between the light emitting diodes 11 of the lamp 10 is sewn.

JP 2017-016451 A

  However, since the traffic light of Patent Document 1 is provided with the heat storage layer 21 on the front side of the lamp (between the translucent panel 20 and the lamp 10), the clarity of the light emitted from the lamp 10 is reduced. For example, it is not always easy to maintain good visibility of the lamp 10. Even if the initial state of the traffic light is good, the sharpness of the lamp 10 may decrease due to the deterioration of the heat storage layer 21 when the years pass.

  In addition, in the traffic light of Patent Document 1, it is difficult to use a light transmissive panel 20 that is curved in a convex lens shape. This is because it is difficult for the traffic light of Patent Document 1 to provide the heat storage layer 21 on the inner surface of the curved translucent panel 20. For this reason, when the translucent panel 20 curved in the shape of a convex lens is adopted in the traffic light of Patent Document 1, a gap is generated between the translucent panel 20 and the heat storage layer 21, and the power consumption of the heating means 30 increases. In addition to this, there is a risk that the light emitted from the lamp 10 may be distorted and visually recognized.

  In addition, along with the reduction in size of vehicle traffic light lamps from 30cm to 25cm in 2017, traffic light manufacturers have been trying to reduce the size of the light box that houses the light. In addition, flat type traffic lights that do not have a hook on the upper side of the lamp are also appearing. In this regard, in the traffic light of Patent Document 1, in order to support the heating wire and the heat storage layer 21 of the heating means 30 on the front side of the lamp 10, the fixing plate 104, the fixing tool 105, and the like are placed on the front side of the lamp 10. There is a large limitation in space, such as the necessity to provide it, and it has a drawback that it is difficult to cope with downsizing of the traffic signal housing 100 (lamp box).

  The present invention has been made in order to solve the above-mentioned problems, and provides a traffic light that can cope with downsizing of a lamp box while preventing snowfall without impairing the visibility of the lamp. To do.

The above issues
A lamp constructed by arranging a plurality of light emitting diodes;
A lamp box having a front surface portion, a back surface portion, a top surface portion, a bottom surface portion, a left side surface portion and a right side surface portion, and having an opening for a lamp for exposing a light emitting surface of the lamp;
A traffic light with
An inner surface of the portion excluding the lamp opening in the upper portion of the front portion of the lamp box, and a planar heater provided along the inner surface of the upper surface portion;
This is solved by providing a traffic light further comprising a heat storage material provided along the inner surface of the planar heater.

  In this way, by arranging the planar heaters at least on the upper side of the front surface and the inner surface of the upper surface of the lamp box, it is possible to prevent snow from rising above the lamp opening in the lamp box. The part provided with the opening for the lamp in the front part of the lamp box is usually fitted with a transparent lamp cover, and the part with the lamp cover is prevented from snowing by the heat of the lamp itself. It is possible. In the traffic light of the present invention, since the planar heater and the heat storage material are not arranged on the front side of the lamp, the visibility of the lamp can be kept good.

  Further, by further arranging the heat storage material on the inner surface of the planar heater, it is possible to increase the heat capacity of the portion of the lamp box where the planar heater is disposed. In addition, when the ambient temperature is high, such as during sunshine, the thermal energy is accumulated in the heat storage material. On the other hand, when the ambient temperature is low, such as during snowfall, the heat storage material can be dissipated. Therefore, the temperature of the lamp box is hardly lowered during snowfall or the like, and the power consumption required for driving the planar heater can be reduced.

  The type of heat storage material used in the traffic light of the present invention is not particularly limited, but preferably uses a gel-like material (gelated heat storage material) that has a uniform specific heat in the operating temperature range and stores sensible heat. Can do. This not only makes the heat storage material less likely to be biased due to vibration or the like, but also makes it less likely to cause a convection phenomenon in the heat storage material, thus improving not only the heat dissipation effect from the heat storage layer but also temperature unevenness. It can also be suppressed. In addition, the heat energy stored in the heat storage material can be dissipated over a long period of time. More preferably, a far-infrared radiator such as ceramic powder is added to the heat storage material.

  In the traffic light of the present invention, it is also preferable to provide a heat insulating material along the inner surface of the back surface portion, the bottom surface portion, the left side surface portion, and the right side surface portion of the lamp box. This prevents the heat generated by the planar heater from escaping from places other than the front and top surfaces of the lamp box, and enables efficient heating of the front and top surfaces that need to prevent snow accumulation. Become. As the heat insulating material, it is preferable to use a thick sheet material made of a foamed resin such as foamed polyethylene. Among these, in consideration of high heat insulation and low water absorption, it is preferable to employ a sheet material made of a closed cell type foamed resin.

  In the traffic light of the present invention, the planar heater may be driven by a dedicated power source (a dedicated planar heater driving power source). However, the traffic signal of the present invention is obtained by taking out the current for driving the lamp from the lamp driving power source for driving the lamp and rectifying it, and converting it into the current for driving the planar heater for driving the planar heater. It is preferable to include a heater rectifier. As already stated, in recent traffic lights, downsizing of the lamp box has been promoted, and it is difficult to secure a sufficient space inside the lamp box. The driving power source can be used as a planar heater driving power source, and it becomes easy to cope with the downsizing of the lamp box. In addition, it is possible to save energy for traffic lights. In this case, when the driving power of the planar heater is 7 to 15 W per lamp, it is possible to use the lamp driving power source as the planar heater driving power source.

  In the traffic light of the present invention, it is provided with a snow accumulating detection means for detecting snow accretion on the front surface of the light box, and the planar heater is driven when the snow accumulating detection means detects the snow accretion. preferable. This makes it possible to automatically activate the planar heater when snow is generated on the front surface of the lamp box. The specification of the snow accretion detection means is not particularly limited, but it is a light reflection side photoelectric sensor having a light emitting part and a light receiving part, and light emitted from the light emitting part is reflected by the snow and received by the light receiving part. Thus, it is preferable to detect that snow has occurred on the front surface of the lamp box. This makes it possible to detect snowfall with high accuracy while having a simple configuration.

  In the traffic light of the present invention, when the snow accretion detection means is provided as described above, the snow accretion detection means may be driven by a dedicated power source (a dedicated power supply for driving the snow accretion detection means). However, for the same reason as the above-mentioned planar heater driving power source, the traffic light of the present invention is rectified by taking out the current for driving the lamp from the lamp driving power source for driving the lamp, and the snow detection detecting means It is preferable to include a snow rectifying means rectifying means for driving the snow accumulating means for driving.

  The traffic light of the present invention is provided with temperature detecting means for detecting the temperature of the front portion of the lamp box, and the temperature detected by the temperature detecting means is a predetermined temperature (hereinafter referred to as “planar heater driving temperature”). It is also preferable that the planar heater is driven when the temperature becomes lower than. In this case, the planar heater driving temperature is preferably set in the range of 10 to 20 ° C. Accordingly, when the temperature of the front part of the lamp box or the like is lowered to the extent that snowfall is a concern, the planar heater can be automatically activated. As the temperature detection means, a thermostat or the like is suitable. The temperature detection means is preferably shared with the above-described snow accretion detection means.

  In the traffic light of the present invention, a plurality of units having different emission colors are provided as lamps, and the current for driving the lamps is taken out for each emission color from the lamp driving power source for driving the lamps, and the sheet heaters are rectified. It is also preferable to include a common rectifying means for driving the snow accretion detecting means and the temperature detecting means. As a result, in a traffic light that emits light in three colors such as red, blue, yellow, etc., the current from the lamp driving power source passes through one rectifier circuit (common rectifier), and the surface heater and the snow detection means In addition, it becomes possible to drive the temperature detection means, simplify the wiring and the like, and easily cope with the downsizing of the lamp box. In addition, by extracting and rectifying the current for driving the lamp for each emission color, it becomes possible to prevent the current of each emission color from interfering.

  As described above, according to the present invention, it is possible to provide a traffic light that can cope with downsizing of a lamp box while preventing snowfall without impairing the visibility of the lamp.

It is the perspective view which showed an example of the external appearance of the traffic signal of this invention. It is sectional drawing which showed the state which cut | disconnected the signal apparatus in FIG. 1 by the plane perpendicular | vertical to the left-right direction of a signal apparatus. It is sectional drawing which showed the state which cut | disconnected and enlarged the planar heater of the signal apparatus in FIG. 2 by a plane perpendicular | vertical to it. It is the electric circuit diagram which showed an example of the drive circuit of a planar heater, snow accretion detection means, and temperature detection means which can be employ | adopted with the signal apparatus of this invention.

  A preferred embodiment of the traffic light of the present invention will be described more specifically with reference to the drawings. FIG. 1 is a perspective view showing an example of the appearance of the traffic light of the present invention. FIG. 2 is a cross-sectional view showing a state where the traffic light in FIG. 1 is cut along a plane perpendicular to the left-right direction of the traffic light. FIG. 3 is a cross-sectional view showing a state in which the planar heater 30 of the traffic light in FIG. 2 is cut and enlarged by a plane perpendicular thereto. FIG. 4 is an electric circuit diagram showing an example of drive circuits for the planar heater 30, the snow detection means 60, and the temperature detection means 70 that can be employed in the traffic light of the present invention.

  In FIG. 1 and FIG. 2, the x axis, the y axis, and the z axis are shown for convenience of explanation. The directions of the x-axis, y-axis, and z-axis coincide with each other in FIGS. In the following, the x-axis positive side is “right”, the x-axis negative is “left”, the y-axis positive is “rear”, the y-axis negative is “front”, and the z-axis The positive direction is sometimes referred to as the “upper” side, and the negative z-axis direction is sometimes referred to as the “lower” side. The positional relationship is not limited.

  The traffic light of the present invention includes a lamp 10 and a lamp box 20 as shown in FIG. As illustrated in FIG. 2, the lamp 10 is configured by arranging a plurality of light emitting diodes 11. The lamp box 20 forms a front surface portion 21 (FIGS. 1 and 2) that forms an outer surface on the front side of the traffic light, a rear surface portion 22 (FIG. 2) that forms an outer surface on the rear side of the traffic light, and an outer surface on the upper side of the traffic light. An upper surface portion 23 (FIGS. 1 and 2), a bottom surface portion 24 (FIG. 2) that forms the lower outer surface of the traffic signal, and a left side surface portion (not shown) that forms the left outer surface of the traffic signal. And the right side surface portion 25 that forms the outer surface on the right side of the traffic light. The front part 21a is provided with a lamp opening 21a for exposing the light emitting surface of the lamp 10. The lamp box 20 is normally structured to be separable into the front surface portion 21 side and the back surface portion 22 side.

  In the traffic light of the present invention, the number of lamps 10 is not particularly limited, but is usually 1 to 3. A traffic light with one lamp 10 is often used as a single-flashing traffic light that is installed at the intersection of narrow streets where a normal traffic light cannot be installed to clarify the master and slaves and prevent encounter accidents. . Further, a traffic light having two lamps 10 is often adopted as a traffic light for pedestrians. Furthermore, a signal device having three lamps 10 is often employed as a signal device for an automobile. In the following, for convenience of explanation, as shown in FIG. 1, a traffic light having three lamps 10 (a traffic light having three lamp openings 21 a provided on the front face 21 of the lamp box 20) is taken as an example. Although the traffic light of the present invention will be described, the number of the lamps 10 is not limited to this, and can be appropriately increased or decreased according to the installation location or usage of the traffic light. The light emission color of the lamp 10 is usually red, blue (green), or yellow. When a plurality of lamps 10 are provided, the lamps 10 may be arranged horizontally or vertically.

  The traffic light of the present invention is provided with a planar heater 30 along the inner surface side of the portion indicated by hatching in FIG. That is, as shown in FIG. 2, the planar heater 30 is provided along the inner surface of the upper portion of the front portion 21 of the lamp box 20 except the lamp opening 21 a and the inner surface of the upper surface portion 23. On the further inner side of the planar heater 30, a heat storage material 40 is disposed along the inner surface of the planar heater 30.

  As described above, by arranging the planar heaters 30 on the inner surface side of the upper portion of the front surface portion 21 and the inner surface side of the upper surface portion 23, it is possible to prevent snow from rising upward from the lamp opening 21 a in the lamp box 20. It is possible. In the traffic light of the present embodiment, as shown in FIG. 2, a portion provided with the lamp opening 21a in the front face 21 of the lamp box 20 is closed with a transparent lamp cover 26. It is possible to prevent snow from being attached to the portion to which 26 is attached by the heat of the lamp 10 itself. Since no member other than the transparent lamp cover 26 is provided on the front side (light emitting surface side) of the lamp 10, the visibility of the lamp 10 is good.

The planar heater 30 is not particularly limited as long as it has a planar shape (sheet shape or mat shape) capable of generating heat, but usually, a heater wire (a wire that generates heat when an electric current is passed. Usually, a metal wire) is planar. What was formed in is used. In the traffic light of this embodiment, as shown in FIG. 3, a heater wire 31 provided with an insulating coating 31 a is sandwiched between a pair of heat transfer sheets 32 (usually a sheet made of a metal such as aluminum). The heater 30 is used. The pair of heat transfer sheets 32 are in a state of being bonded to each other by an adhesive 33 disposed therebetween.
The thickness of the planar heater 30 is not particularly limited, but is usually 1 to 5 mm, and preferably 2 to 3 mm.

  Further, by further arranging the heat storage material 40 on the inner surface side of the planar heater 30, it is possible to increase the heat capacity of the portion of the lamp box 20 where the planar heater 30 is disposed. The heat storage material 40 can store not only heat energy generated by the planar heater 30 but also heat energy generated in the lamp 10. In addition, when the ambient temperature is high, such as during sunshine, it is possible to store the heat energy of the outside air at that time in the heat storage material 40. The heat energy accumulated in the heat storage material 40 is released when the ambient temperature is low, such as during snowfall, and warms the lamp box 20. Therefore, the temperature of the lamp box 20 is not easily lowered during snowfall and the power consumption required for driving the planar heater 30 can be reduced. Where only the thermal energy of the lamp 10 cannot prevent snow from reaching the lamp cover 26 and the like, the surface heater 30 and the heat storage material 40 are provided as described above. In addition to the heat energy generated in step 1, the heat energy of the planar heater 30 and the outside air is layered, so that it is possible to more reliably prevent snow from reaching the lamp cover 26 and the like.

  Although the heat storage material 40 will not be specifically limited if it has heat storage property, In the traffic signal of this embodiment, it is set as the gelled heat storage material. As the gelled heat storage material used as the heat storage material 40, a gelled aqueous solution of a water absorbent resin can be suitably used. In the traffic light of this embodiment, the heat storage material 40 is obtained by adding a copolymer of isobutylene / maleic anhydride (water-absorbing resin), ethylene glycol (an antifreezing agent), and a crosslinking agent to water to form a gel. I use it. Thereby, it is possible not only to improve the heat radiation effect from the heat storage material 40 but also to make it difficult for the heat storage material 40 to be biased due to vibration or the like. In the traffic light 40 of this embodiment, a far-infrared radiator is further added to the gelled heat storage material (heat storage material 40). As the infrared radiator, ceramic powder and the like are suitable.

  However, since the gelled heat storage material itself does not easily maintain a planar shape, it is difficult to accommodate in the lamp 20 as it is. For this reason, when a gelled heat storage material is employed as the heat storage material 40, the gelled heat storage material is normally filled in a container (including a flexible bag-shaped material). In the traffic light of this embodiment, the heat storage material 40 is filled by filling the above-mentioned gelled heat storage material into a rectangular bag-shaped container composed of a three-layer film obtained by bonding a polyethylene low-temperature sealing film, a polyethylene film, and a polypropylene film. Is configured. The thickness of the heat storage material 40 is not particularly limited, but is usually 5 to 30 mm, and preferably 10 to 20 mm.

  The planar heater 30 and the heat storage material 40 may be provided at least inside the upper portion of the front surface portion 21 and inside the upper surface portion 23 in the lamp box 20. The planar heater 30 and the heat storage material 40 may be provided inside the lower portion of the front surface portion 21, inside the back surface portion 22, inside the bottom surface portion 24, inside the left side surface portion, and the right side surface portion 25. However, since these places do not affect the visibility of the lamp 10 even if it snows there, the necessity of providing the planar heater 30 and the heat storage material 40 at these places is low. For this reason, in the traffic light of this embodiment, the planar heater 30 and the heat storage material 40 are provided only on the inner side of the upper portion of the front surface portion 21 and the inner surface of the upper surface portion 23.

  However, the heat in the lamp box 20 (especially stored in the heat storage material 40) is passed through a portion of the lamp box 20 where the planar heater 30 and the heat storage material 40 are not provided (the back surface portion 22, the bottom surface portion 24, the left side surface portion, and the right side surface portion 25). If a large amount of (heated heat) is released, there is a possibility that the front surface portion 21 and the upper surface portion 23 that need to prevent snow accumulation cannot be efficiently heated. In addition, the power consumption of the planar heater 30 may increase. For this reason, in the traffic light of this embodiment, as shown in FIG. 2, a heat insulating material 50 is provided along the inner side of the back surface portion 22 and the inner surface of the bottom surface portion 24. Although not shown in FIG. 2, the heat insulating material 50 is also provided at locations along the inner surface of the left side surface portion and the inner surface of the right side surface portion 25.

  The type of the heat insulating material 50 is not particularly limited. However, in the traffic light of the present embodiment, in consideration of keeping the heat insulating property good and keeping the water absorption low, etc., the closed cell type foaming. A sheet material or mat material made of resin (foamed polyethylene) is used as the heat insulating material 50. Although the thickness of the heat insulating material 50 is not specifically limited, Usually, it is 5-50 mm, Preferably, it is 10-30 mm. In the traffic light of this embodiment, the thickness of the heat insulating material 50 is about 20 mm.

  The size of the lamp box 20 varies depending on the number of lamps 10 and the like, and is not particularly limited. However, the traffic light of this embodiment is smaller than the conventional one. Specifically, the lateral width of the lamp box 20 is 106 cm, the height is 36 cm, and the depth is 6 cm. In a three-lamp type laterally arranged traffic light, when a light emitting diode type having a diameter of 25 cm is used as the lamp 10, the width of the lamp box 20 is preferably 90 to 110 cm, and the height of the lamp box 20 is 30-40, and the depth of the lamp box 20 is preferably 5-20 cm. The traffic light of the present invention can suitably prevent snow from reaching the lamp box 20 even when the size of the lamp box 20 is small and the internal space of the lamp box 20 is narrow.

  The planar heater 30 may be manually driven, but is normally automatically driven. In the traffic light of the present embodiment, as shown in FIG. 1, a snow accretion detection means 60 is provided for detecting snow accretion on the front surface portion 21 of the lamp box 20. The planar heater 30 is driven when detected. In the traffic light of the present embodiment, a light reflection type photoelectric sensor having a light emitting unit 61 and a light receiving unit 62 is used as the snow accretion detecting means 60. This photoelectric sensor (snow accretion detection means 60) outputs a snow accretion detection signal when the light emitted forward from the light emitting unit 61 is reflected by the snow and received by the light receiving unit 62 at a predetermined level or higher. It has become. The photoelectric sensor used as the snow accretion detection means 60 is preferably one that emits infrared light or far infrared light from the light emitting unit 61, and in particular, taking into account the prevention of malfunction due to disturbance light in sunlight. It is more preferable to use one that emits a modulated wave.

  Further, the traffic light of this embodiment is also provided with a temperature detection means 70 (FIG. 4) for detecting the temperature of the front surface portion 21 in the lamp box 20, and the temperature detected by the temperature detection means 70 is a predetermined temperature ( Even when the temperature is lower than the planar heater driving temperature), the planar heater 30 is driven. The planar heater driving temperature is usually set to 10 to 20 ° C. In addition, the planar heater 30 is automatically stopped when the temperature detected by the temperature detecting means 70 becomes higher than a predetermined temperature (planar heater stop temperature). The planar heater stop temperature is usually 20 to 40 ° C. Although various temperature sensors can be used as the temperature detection means 70, the traffic light of this embodiment employs a thermostat as will be described later.

  The planar heater 30 may be driven by a dedicated power source (dedicated planar heater driving power source). However, in the traffic light of the present embodiment, the lamp driving power source for driving the lamp 10 is shared. I have to. In addition, the lamp driving power source is also used as the snow detection detecting means driving power source for driving the snow detecting means 60 and the temperature detecting means driving power source for driving the temperature detecting means 70. Specifically, a substrate including the electric circuit 100 shown in FIG. 4 is provided inside the lamp box 20 (A portion in FIG. 1), and the output current of the lamp driving power source is supplied to the planar heater 30 and the electric circuit 100 through the electric circuit 100. The snowfall detection means 60, the temperature detection means 70, etc. are converted into those that can be used. For this reason, it is possible to cope with the downsizing of the lamp box 20. If the driving power of the planar heater 30 is about 7 to 15 W per lamp, the planar heater 30 can be suitably driven by an electric circuit as shown in FIG.

  The electric circuit 100 shown in FIG. 4 (hereinafter may be referred to as “a planar heater driving circuit”) will be described in more detail. The COM terminal in the driving circuit 100 such as the planar heater in FIG. 4 is connected to the COM terminal of the lamp driving power source. Further, the B terminal in the driving circuit 100 such as a planar heater is connected to the B terminal of the lamp driving power source (the terminal for supplying current to the lamp 10 whose emission color is blue). Furthermore, the R terminal in the driving circuit 100 such as the planar heater is connected to the R terminal of the lamp driving power source (terminal for supplying current to the lamp 10 whose emission color is red). Furthermore, the E terminal in the driving circuit 100 such as a planar heater is connected to the E terminal of the lamp driving power source (the terminal for supplying current to the lamp 10 whose emission color is yellow).

  In the driving circuit 100 such as the planar heater, voltages input from the B terminal, the R terminal, and the E terminal are converted into a DC voltage of 130 V by the rectifier circuit 101, and the planar heater is passed through the switching circuit 102 and the like. 30, snow detection means 60, and temperature detection means 70. In other words, the rectifier circuit 101 functions as a common rectifier that generates a DC voltage for driving the planar heater 30, the snow accretion detector 60, and the temperature detector 70. In the traffic light of this embodiment, the rectifier circuit 101 prevents the mutual interference by taking out the current for driving the lamp for each emission color (B terminal, R terminal and E terminal) and rectifying it. The thermostud that functions as the temperature detecting means 70 is connected in series with the planar heater 30 (resistive element). Further, a contactless relay 103 is disposed between the snow accretion detection means 60 and the planar heater 30.

  The use of the traffic light of the present invention described above is not limited, and can be employed in various traffic lights such as road signals and railway signals. The “traffic light” in this specification is a concept including an electric bulletin board for posting various guides on a general road, a highway, and the like, a road sign, and the like. The traffic light of the present invention is suitable for installation in a cold region where there is a risk of a decrease in visibility due to snowfall.

DESCRIPTION OF SYMBOLS 10 Lamp 11 Light emitting diode 20 Light box 21 Front part 21a Lamp opening 22 Back part 23 Upper part 24 Bottom part 25 Right side part 26 Lamp cover 30 Planar heater 31 Heater wire 31a Insulation coating 32 Heat transfer sheet 33 Adhesive 40 Heat storage material 50 Heat insulation material 60 Snow accretion detection means 61 Light emitting part 62 Light receiving part 70 Temperature detection means 100 Drive circuit (electric circuit) such as planar heater
101 Rectifier circuit (shared rectifier)
102 switching circuit 103 contactless relay

Claims (11)

A lamp constructed by arranging a plurality of light emitting diodes;
A lamp box having a front surface portion, a back surface portion, a top surface portion, a bottom surface portion, a left side surface portion and a right side surface portion, and having an opening for a lamp for exposing a light emitting surface of the lamp;
Equipped with a,
It is a flat type traffic light that does not have a fence on the upper side of the lamp ,
An inner surface of the portion excluding the lamp opening in the upper portion of the front portion of the lamp box, and a planar heater provided along the inner surface of the upper surface portion;
A heat storage material provided along the inner surface of the planar heater ;
A traffic light further comprising: a heat insulating material provided along inner surfaces of a back surface portion, a bottom surface portion, a left side surface portion, and a right side surface portion of the lamp box .
The traffic light according to claim 1, wherein the heat storage material is a gelled heat storage material.
The traffic light according to claim 1 or 2, wherein a far-infrared radiator is added to the heat storage material.
A heater for rectifying a planar heater is provided, which rectifies by taking out a current for driving the lamp from a lamp driving power source for driving the lamp, and converts the current into a current for driving the planar heater to drive the planar heater. Item 4. The traffic light according to any one of Items 1 to 3 .
The traffic light according to claim 4 , wherein the driving power of the planar heater is 7 to 15 W per lamp.
It has snow detection means for detecting snow on the front part of the light box,
The traffic light according to any one of claims 1 to 5 , wherein the surface heater is driven when the snow accretion detecting means detects snow accretion.
The snow accretion detecting means is a photoelectric sensor on the light reflection side having a light emitting part and a light receiving part, and the light emitted from the light emitting part is reflected on the snow and received by the light receiving part, so that the snow accumulating on the front part of the lamp box. The traffic light according to claim 6 , wherein the traffic light is detected.
A rectifying means for snow accumulating detection means is provided for taking out the current for driving the lamp from the lamp driving power source for driving the lamp and rectifying the current to drive the snow accumulating detection means for driving the snow accumulating detection means. The traffic light according to claim 6 or 7 .
Provided with temperature detecting means for detecting the temperature of the front part of the light box,
Temperature sensed is (hereinafter referred to as "planar heater driving temperature".) A predetermined temperature by the temperature detecting means planar heater when it becomes lower than the according to any one of claims 1-8 which is adapted to drive traffic lights.
The traffic light according to claim 9, wherein the planar heater driving temperature is set in a range of 10 to 20 ° C.
Multiple lamps with different emission colors are provided as lamps,
A snow accretion detection means for detecting snow accretion on the front part of the light box;
Temperature detection means for detecting the temperature of the front portion of the light box;
A common rectifying means for driving a sheet heater, a snow detection detecting means and a temperature detecting means, taking out the current for driving the lamp from the lamp driving power source for driving the lamp for each emission color and rectifying it,
Those with the claims 1-10 traffic according to any one.

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