JP5890158B2 - Self-luminous traffic sign board - Google Patents

Description

  The present invention relates to a self-luminous traffic sign board using a solar cell as a power source.

  Conventionally, solar cells are installed on traffic sign boards such as road signs, light energy is converted into electric energy during daytime, the storage battery is charged, and lighting is started when sunset is detected by a day / night detection circuit, etc. A self-luminous traffic sign board has been developed that switches on and starts blinking of a light emitter such as an LED or EL provided on the traffic sign board.

  Patent Document 1 describes a self-luminous road sign board. As shown in the sectional view of the self-luminous sign board in FIG. 2, the self-luminous road sign board is composed of a light guide plate, a light diffusion plate and a retroreflective sheet in this order from the back side to the front side. The retroreflective sheet is cut out only for parts such as characters to be displayed. When an LED provided on one end surface of the light guide plate is caused to emit light, the light is diffusely reflected in the light guide plate and then passes through the light diffusion plate to emit light from the cut out character portion to the outside. Here, when light from a light such as an automobile enters the retroreflective sheet, the reflected light is emitted in the incident direction due to the properties of the retroreflective sheet. More specifically, the glass beads in the retroreflective sheet serve as a lens, so that reflected light is emitted as it is in the direction of the light source of incident light. As a result, the presence of the road sign board is shown to the driver of the car, and the character portion emits light stronger than the reflected light, so that the character can be easily recognized.

  FIG. 9 shows a cross-sectional view of a conventional self-luminous type (hereinafter abbreviated as “self-luminous type”) traffic sign board 70. In FIG. 9, the left side is the surface (light emission) side of the self-luminous traffic sign board 70, and the right side is the back side. In FIG. 9, reference numeral 71 is a back plate on the back side of the self-luminous traffic sign board 70, 72 is a light guide plate provided on the back plate 71, 73 is a transparent acrylic plate provided on the light guide plate 72, and 74 is A retroreflective sheet (semi-transmissive type) 75 on which a traffic sign to be displayed pasted on the transparent acrylic plate 73 is formed, and 75 is an LED provided on one end surface side around the light guide plate 72. The LED 75 is connected to an electronic circuit, a solar cell, etc., but is omitted in FIG. When the LED 75 emits light, the light L is diffusely reflected in the light guide plate 72, passes through the transparent acrylic plate 73, passes through the transflective retroreflective sheet 74, and emits light to the outside. Here, when the incident light M from a light such as an automobile enters the retroreflective sheet 74, the retroreflective sheet 74 emits the reflected light Mref as it is in the direction of the light source of the incident light M due to the properties of the retroreflective sheet 74 described above. The As a result, the presence of the self-luminous traffic sign board 70 is shown to the driver of the car, and the traffic sign can be easily recognized by the light L from the traffic sign portion. In addition, although not shown, a plurality of LEDs are installed on the outer periphery of the sign frame on the surface of the self-luminous traffic sign board 70, and the plural LEDs are blinked to display the self-luminous traffic sign board 70. It was made easier to recognize.

  In the conventional self-luminous traffic sign board 70 described above, the light guide plate 72 is used, and the transparent acrylic plate 73 and the retroreflective sheet 74 are used on the light guide plate 72. However, the retroreflective sheet 74 is a transflective type. Therefore, it is not only more expensive than the total reflection type retroreflective sheet, but also has a problem that the light L is transmitted through the retroreflective sheet 74 and the luminance is lowered. In order to increase the luminance, a large amount of light is required. As a result, a storage battery, a solar battery, and the like with large power consumption and capacity are required, which further increases the cost. When an inorganic EL sheet that emits surface light is used instead of the light guide plate 72, the inorganic EL sheet must be ordered in a lot of lot units, so that the procurement cost is high and the luminance is easily deteriorated. There was a problem that decreased. Although a plurality of LEDs are installed on the outer periphery of the sign frame on the surface of the self-luminous traffic sign board 70, extra time and cost are required due to the complicated structure of the plurality of LEDs installed on the outer periphery. There was a problem of low productivity.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and is a self-luminous traffic sign board that reduces manufacturing costs, consumes less power, and has high productivity, and reduces brightness. It is an object of the present invention to provide a self-luminous traffic sign board that can be clearly recognized without any problem.

A self-luminous traffic sign board according to the present invention is a self-luminous traffic sign board that uses a solar cell as a power source, and is combined with a total reflection type retroreflective sheet on which a predetermined sign is formed and the retroreflective sheet. A light guide plate provided on the surface side of the self-luminous traffic sign board, wherein the retroreflective sheet inner surface is processed with a dot-like reflecting portion superimposed on a display outline of the predetermined sign; and A light-emitting unit provided on one end surface of the light guide plate with a solar cell as a power source, and reflects light emitted from the light-emitting unit to the outside of the self-luminous traffic sign board by the dot-like reflecting unit. Thus, the predetermined sign is displayed in a light-emitting manner.

  Here, in the self-luminous traffic sign board according to the present invention, an optical sensor that detects light reflected from the dot-like reflecting portion and incident on one end surface of the light guide plate from the outside of the self-luminous traffic sign board. Can further be provided.

  Here, in the self-luminous traffic sign board of the present invention, the self-luminous traffic sign board is further provided with a dot-like reflecting portion different from the dot-like reflector, which reflects light incident from the outside of the self-luminous traffic sign board. be able to.

  Here, in the self-luminous traffic sign board of the present invention, the self-luminous traffic sign board further includes a downward illuminating unit connected to the optical sensor, and the downward illuminating part is incident from the outside of the self-luminous traffic sign board by the optical sensor. When light is detected, the light that illuminates the lower direction of the self-luminous traffic sign board can be emitted.

  Here, the self-luminous traffic sign board according to the present invention further includes a front direction illumination unit connected to the optical sensor, and the front direction illumination unit is incident from the outside of the self-luminous traffic sign plate by the optical sensor. When light is detected, the light that illuminates the front direction of the self-luminous traffic sign board can be emitted.

  Here, in the self-luminous traffic sign board according to the present invention, the dot-shaped reflecting portion is processed according to the indication of a sign different from the predetermined sign, and when the light emitting part does not emit light, the predetermined reflecting part is used. When the light emitting portion emits light, a sign different from the predetermined sign can be displayed.

  Here, in the self-luminous traffic sign board of the present invention, a scattering prevention sheet can be further provided on the light guide plate.

  Here, in the self-luminous traffic sign board of the present invention, the predetermined sign may be a regulation sign, a warning sign, a guide sign, an instruction sign, or an auxiliary sign.

  The self-luminous traffic sign board of the present invention is a total reflection type retroreflective sheet on which a predetermined sign is formed, and a light guide plate provided on the self-luminous traffic sign board surface side on the retroreflective sheet, Provided with an inner surface of the retroreflective sheet on which a dot-like reflecting portion is processed in accordance with the display of a predetermined sign, and a light emitting portion provided on one end surface of the light guide plate on the peripheral side and using a solar cell as a power source The light emitted from the light emitting part or the light irregularly reflected in the light guide plate is reflected by the dot-like reflecting part to the outside of the self-light-emitting traffic sign board, thereby displaying a predetermined sign. By using an inexpensive total reflection type retroreflective sheet, the manufacturing cost can be reduced as compared with the case of using an expensive transflective type retroreflective sheet, and a light guide plate made of a resin plate is used. By using it, a manufacturing cost can be reduced compared with the case where an expensive inorganic EL sheet is used. Further, by using an LED as the light emitting portion, current consumption during light emission is small, and it is difficult to deteriorate and high brightness can be maintained for a long time. As a result of arranging the retroreflective sheet on the back surface of the light guide plate, the emitted light does not pass through the retroreflective sheet as in the prior art, so the luminance does not decrease. Since the self-luminous traffic sign board of the present invention has a simple structure, the productivity is high and it is easy to meet the delivery date. In addition, since the electric storage device uses an electric double layer capacitor, there is little deterioration over time due to charging and discharging, and the product life is longer than that of the conventional storage battery. As a result, there is provided a self-luminous traffic sign board that reduces manufacturing costs, consumes less power, and has high productivity, and can be clearly recognized without reducing luminance. There is an effect that can be.

It is sectional drawing of the self-light-emitting traffic sign board 10 in Example 1 of this invention. It is an enlarged view of dot-like reflective part 14a. It is a figure which shows the surface side of the light-guide plate 13, and the surface side of the retroreflection sheet | seat 12 in the case of taking the stop sign | symbol as an example as a predetermined | prescribed label | marker. It is sectional drawing of the self-light-emitting traffic sign board 20 in Example 2 of this invention. It is sectional drawing of the self-light-emitting traffic sign board 30 in Example 3 of this invention. It is sectional drawing of the self-light-emitting traffic sign board 40 in Example 4 of this invention. It is a figure which shows the self-light-emitting traffic sign board 50 in Example 5 of this invention. It is a figure which shows the self-light-emitting traffic sign board 60 in Example 6 of this invention. It is sectional drawing of the conventional self-light-emitting traffic sign board 70. FIG.

  Hereinafter, embodiments will be described in detail with reference to the drawings.

  FIG. 1 shows a cross-sectional view of a self-luminous traffic sign board 10 in Embodiment 1 of the present invention. In FIG. 1, the left side is the front surface (light emission) side of the self-luminous traffic sign board 10, and the right side is the back side. In FIG. 1, reference numeral 11 is a back plate on the back side of the self-luminous traffic sign board 10, 12 is a total reflection type retroreflective sheet on which a predetermined sign to be displayed is pasted on the back board 11, 13 A light guide plate 15 provided on the surface side of the self-luminous traffic sign board 10 on the retroreflective sheet, and 15 is a light emitting portion provided on one end face of the light guide plate 13 on the peripheral side.

  The material of the back plate 11 described above is preferably an aluminum plate, and the material of the light guide plate 13 is preferably a transparent acrylic resin plate. Self-luminous traffic by combining the back plate 11 with the retroreflective sheet 12 and the light guide plate 13 together, and fixing the peripheral edge with an aluminum frame that is rounded (curved) to round the U-shaped corners. A case (not shown) of the sign plate 10 is assumed.

  As the predetermined signs of the retroreflective sheet 12, regulatory signs such as “stop”, “closed”, “prohibition of proceeding outside designated direction”, “prohibit parking / stopping”, “only for automobiles”, “vehicle traffic classification”, etc. are suitable. . Alternatively, warning signs such as “with railroad crossing” and “under construction on road” may be used. In addition, a guide sign indicating “prefecture” or the like, an instruction sign indicating “crosswalk” or the like, or an auxiliary sign indicating “type of vehicle” or the like may be used. The predetermined sign is generally constituted by a pictograph. The retroreflective sheet 12 may be a general sheet composed of a plastic surface film, a minute glass bead layer, and a reflective layer in this order from the surface side. As described in the background art, when the glass beads function as a lens, the reflected light is emitted as it is in the direction of the light source of the incident light. The predetermined mark is formed by screen printing in which a desired pictogram pattern is formed with a resist on an appropriate fabric (screen), and ink is pushed out from the opening of the screen and printed on the retroreflective sheet 12.

  The light emitting unit 15 is preferably an LED. The power supply device (not shown) of the light emitting unit 15 uses a solar cell. A drive circuit (not shown) of the light emitting unit 15 is formed on the substrate and built in the power supply device. It is preferable to use an electric double layer capacitor for the power storage device (not shown). Since electric double layer capacitors have low internal resistance, they can be charged and discharged in a short time, and because they have little deterioration over time due to charging and discharging, the product life is compared with the life of conventional storage batteries (about 3 to 4 years). About 10 years long.

  As shown in FIG. 1, the light guide plate 13 has dot-like reflecting portions 14a, 14b, 14c and the like (hereinafter referred to as “dot-like reflecting portion 14a etc.) matched to the display of a predetermined sign on the inner surface S on the retroreflective sheet 12 side. "Is abbreviated as") (shown in a dotted circle). The dot-like reflecting portions 14 a and the like are formed so as to reflect the light A emitted from the light emitting portion 15 or the light A ′ after irregular reflection in the light guide plate 13 and reflect it to the surface side of the light guide plate 13. The dot-like reflecting portions 14a and the like are preferably prism-shaped notches formed by prism mirror finishing that is polished flat on the inner surface S like a mirror.

  FIG. 2 shows an enlarged view of the dot-like reflecting portion 14a and the like. In FIG. 2, the parts denoted by the same reference numerals as those in FIG. As shown in FIG. 2, the dot-like reflecting portions 14 a and the like are reflecting surfaces 14 as and 14 bs (hereinafter referred to as “14 as and the like”) that reflect the light A from the light emitting portion 15 or the light A ′ after irregular reflection in the light guide plate 13. The angle α with respect to the inner surface S of the reflecting surface 14as or the like is the same for the reflecting surface 14as or the like. The shape of the reflection surface 14as and the like viewed from the light emitting unit 15 side is substantially rectangular, and the cross-sectional shape is a triangle having the reflection surface 14as and the like as a hypotenuse as shown in FIG. However, the shape of the reflecting surface 14as and the like viewed from the light emitting unit 15 side is not limited to a substantially rectangular shape, and the light A from the light emitting unit 15 or the light A ′ after irregular reflection in the light guiding plate 13 is used. Other polygons may be used as long as the shape is reflected to the surface side. In the case of the substantially rectangular shape, the aspect ratio is preferably set to a desired ratio in consideration of the luminance of the dot-like reflecting portion 14a and the like. Similarly, the shape of the cross section of the dot-like reflecting portion 14a or the like is a triangle (if the shape reflects light A from the light emitting portion 15 or light A ′ after irregular reflection in the light guide plate 13 to the surface side of the light guide plate 13). The reflecting surface 14as or the like is not limited to a flat surface), and may be a fan shape or the like (the reflecting surface 14as or the like is a curved surface). The angle α is preferably set to a desired angle considering the visibility of the dot-like reflecting portion 14a when the self-luminous traffic sign board 10 is viewed from the front side, the reflection efficiency of the light A or A ′, and the like. is there. Similarly, the heights 14ap and 14bp (hereinafter referred to as “14ap and the like”) of the dot-like reflecting portions 14a and the like are preferably set to a desired height in consideration of the visibility and the like.

  As described above, the processing of the dot-like reflecting portions 14a and the like is preferably performed by prism mirror processing, but other processing methods may be used. For example, using a processing tool having a blade portion corresponding to the shape of the dot-like reflecting portion 14a or the like, the blade portion can be pushed into the back surface of the light guide plate 13, and then the blade portion can be pulled out. At that time, it is preferable to heat the blade portion and / or the light guide plate 13 to the softening point at which the light guide plate 13 becomes liquid. As other processing methods, cutting, press molding, injection molding, or the like may be used.

  FIG. 3 shows the surface side of the light guide plate 13 and the surface side of the retroreflective sheet 12 when a “stop” restriction mark is taken as an example of the predetermined mark. In FIG. 3, the parts denoted by the same reference numerals as those in FIG. In FIG. 3, for convenience of explanation, the light guide plate 13, the light emitting unit 15, and the retroreflective sheet 12 are shown separated (shifted). As shown in FIG. 3, on the retroreflective sheet 12, a “stop” character and an inverted triangular figure surrounding the character are formed by screen printing. On the inner surface of the light guide plate 13 on the retroreflective sheet 12 side, a dot-like reflection is formed so as to overlap with the contour of the “stop” character formed on the retroreflective sheet 12 and the contour of the inverted triangle shape surrounding the character. The parts 14a and the like are processed with appropriate intervals. The light emitting portions 15 are provided in a row on one end surface of the light guide plate 13 (for example, the upper end surface of the light guide plate 13 as shown in FIG. 3). Reference numeral 21 denotes an optical sensor, which will be described in a second embodiment.

  As shown in FIG. 1, when the light emitting unit 15 emits light, the light A or the light A ′ after irregular reflection in the light guide plate 13 is transferred to the outside of the self-luminous traffic sign board 10 by the dot-like reflecting unit 14 a or the like. Reflected. As shown in FIG. 3, the dot-like reflecting portions 14 a and the like are appropriately spaced so as to overlap with the contour of the “stop” character formed on the retroreflective sheet 12 and the contour of the inverted triangle shape surrounding the character. Open and processed. As a result, light is emitted so that the “stop” character and the inverted triangular shape surrounding the character can be seen from the outside. As described above, by prism-finishing the dot-like reflecting portion 14a and the like, it is less likely to obstruct the viewing of the pictogram formed on the retroreflective sheet 12. A self-luminous traffic sign board 10 is provided with a phototransistor (not shown) that senses light and dark at a desired position. When the phototransistor detects that the external brightness is below a predetermined value, The light emitting unit 15 is turned on. It is preferable that the light emitting unit 15 is turned on and off at night. The retroreflective sheet 12 does not shine by the light A from the light emitting unit 15 or the light A ′ after irregular reflection in the light guide plate 13. The retroreflective sheet 12 is retroreflected (light Bref) by light incident from the outside (for example, light B emitted from a car light at night). As a result, at night, the presence of the sign (for example, “stop”) on the self-luminous traffic sign board 10 is indicated to the driver of the automobile by the light Bref, and the light A or A ′ from the dot-like reflecting portion 14a or the like is displayed. Due to the light emitting display, the sign (for example, “stop”) of the self-luminous traffic sign board 10 can be made to be visually recognized by a driver such as an automobile.

  Table 1 is a table comparing various performances of the invention according to the present invention, the conventional product according to the prior art, and the current product by the applicant. The first row “2/3 times” and “1 time” in Table 1 is not the case of the self-luminous traffic sign board 10 but the length of the side of the triangle of the sign part (sign sheet) (assuming the sign “stop”) Represents One side with a length of 800 mm is called “1 ×”, and “2/3 times” has a side with a length of 800 mm × 2/3 and has a triangular shape of about 530 mm. As shown in the current consumption column and the effect column in Table 1, in the case of “2/3 times”, if the current consumption of 500 mA of our current product is assumed to be 100%, the invention product has an effect of 5.6 with a current consumption of 28 mA to 140 mA. %, Which is 1/10 of the effect of 56% of the conventional product. In the case of “1x”, if the current consumption of 800 mA to 1 A of our current product is assumed to be 100%, the product of the invention is extremely low with 5.2% of the current consumption of 42 mA to 210 mA, and 52% of the effect of the conventional product. Even if it compares, it is 1/10.

  As described above, according to the first embodiment of the present invention, the self-luminous traffic sign board 10 using a solar cell as a power source includes the total reflection type retroreflective sheet 12 on which a predetermined sign is formed, and the retroreflective sheet. 12 is a light guide plate 13 provided on the surface side of the self-luminous traffic sign board 10 on the inner surface S on the retroreflective sheet 12 side, and a dot-like reflecting portion 14a or the like that matches the display of a predetermined sign is processed. And a light emitting portion 15 provided on one end surface of the light guide plate 13 and using a solar cell as a power source. The light A emitted from the light emitting portion 15 or the light A irregularly reflected in the light guide plate 13 is provided. By reflecting 'to the outside of the self-luminous traffic sign board 10 by the dot-like reflecting portion 14a or the like, a predetermined sign can be displayed in a light-emitting manner.

  As described above, by using the inexpensive total reflection type retroreflective sheet 12, the manufacturing cost can be reduced as compared with the case where an expensive transflective type retroreflective sheet is used. By using the light guide plate 13 as a material, the manufacturing cost can be reduced as compared with the case where an expensive inorganic EL sheet is used. Furthermore, by using an LED as the light emitting unit 15, current consumption during light emission is small, and it is difficult to deteriorate and high brightness can be maintained for a long time. As a result of arranging the retroreflective sheet 12 on the back surface of the light guide plate 13, the emitted light does not pass through the retroreflective sheet as in the prior art, so that the luminance does not decrease. Since the self-luminous traffic sign board 10 has a simple structure, it is highly productive and can be easily delivered. In addition, since the electric storage device uses an electric double layer capacitor, there is little deterioration over time due to charging and discharging, and the product life is longer than that of the conventional storage battery. As a result, there is provided a self-luminous traffic sign board 10 that can reduce the manufacturing cost, has low power consumption and is highly productive, and can be clearly recognized without reducing the luminance. can do.

  FIG. 4 shows a cross-sectional view of the self-luminous traffic sign board 20 according to the second embodiment of the present invention. In FIG. 4, the parts denoted by the same reference numerals as those in FIG. As shown in FIG. 4, the self-luminous traffic sign plate 20 has a light B such as a vehicle headlamp that is incident on one end surface of the light guide plate 13 from the outside (front side) of the light-emitting traffic sign plate 20. Is further reflected by the dot-like reflecting portion 14a and the like, and an optical sensor 21 for detecting the reflected light B is further provided. The position of the optical sensor 21 shown in FIG. 4 is the same as that of the light emitting unit 15 of the first embodiment because it is a cross-sectional view, but as shown on the upper side of the light guide plate 13 in FIG. The optical sensor 21 is appropriately installed at one or a plurality of locations in the row of the light emitting units 15 provided on the peripheral side end surface (upper end surface) of the light guide plate 13. As described above, when the light emitting unit 15 according to the first embodiment is turned off, the light B from the outside is reflected in a direction opposite to the light reflecting direction from the light emitting unit 15 to the outside by the dot-like reflecting unit 14a or the like. The light can be condensed by being reflected by the dot reflecting portion 14a or the like. Needless to say, when the light-emitting unit 15 is in a blinking lighting state, the light A is reflected from the light-emitting unit 15 to the outside by the dot-like reflecting unit 14a or the like as described in the first embodiment.

  As described above, according to the second embodiment of the present invention, the self-luminous traffic sign plate 20 is incident on one end surface of the light guide plate 13 from the outside (front side) of the self-luminous traffic sign plate 20. A light sensor 21 is further provided for detecting the reflected light B by reflecting the light B such as a headlamp by the dot-like reflecting portion 14a or the like. For this reason, when the light emitting unit 15 in the first embodiment is turned off and blinking, the light B from the outside is reflected in a direction opposite to the light reflecting direction from the light emitting unit 15 to the outside by the dot-like reflecting unit 14a or the like. The light can be condensed by being reflected by the dot reflecting portion 14a or the like. As described above, in addition to the effects of the first embodiment, the self-light-emitting traffic sign that can sense the light B such as the vehicle headlamp when the light emitting unit 15 in the first embodiment is blinking in the nighttime in addition to the effects of the first embodiment. A plate 20 can be provided.

  FIG. 5 shows a cross-sectional view of the self-luminous traffic sign board 30 according to the third embodiment of the present invention. In FIG. 5, the parts denoted by the same reference numerals as those in FIG. As shown in FIG. 5, the light-emitting traffic sign board 30 has a dot-like reflection for receiving light that reflects light B such as a vehicle headlamp incident from the outside of the self-light-emitting traffic sign board 30 to the optical sensor 15 side. Part 31 is arranged. The light receiving dedicated dot-like reflecting portion 31 is another dot-like reflecting portion different from the dot-like reflecting portion 14a and the like in the first embodiment. In the self-luminous traffic sign board 30 shown in FIG. 5, the dot-like reflector 14a shown in FIG. 1 or 4 is omitted for convenience of explanation. However, the self-luminous traffic sign board 30 includes dot-like reflectors 14a and the like, like the self-luminous traffic sign board 10 or 20 shown in FIG. As a result, the light B from the outside can be reflected by the light-receiving dedicated dot-like reflecting portion 31 and condensed on the optical sensor 21 even when the light-emitting portion 15 is in the lighting state as well as the blinking off state. Needless to say, when the light-emitting unit 15 is in a blinking lighting state, the light A is reflected from the light-emitting unit 15 to the outside by the dot-like reflecting unit 14a or the like as described in the first embodiment.

  As described above, according to the third embodiment of the present invention, the light B such as the vehicle headlamps incident from the outside of the self-luminous traffic sign board 30 is incident on the self-luminous traffic sign board 30 to the optical sensor 21 side. A light receiving dot-like reflecting portion 31 to be reflected is arranged. As described above, in addition to the effects of the first and second embodiments, the light B such as the vehicle headlamp can be sensed not only in the off state in which the light emitting unit 15 is blinking at night but also in the on state. A self-luminous traffic sign board 30 can be provided.

  FIG. 6 shows a self-luminous traffic sign board 40 according to the fourth embodiment of the present invention. As shown in FIG. 6, the self-luminous traffic sign board 40 is installed on the support column 42, and the downward direction is connected to the optical sensor 21 on the self-luminous traffic sign boards 20 and 30 of the second and third embodiments. The irradiation unit 41 is further provided. In FIG. 6, the downward irradiation unit 41 is installed on the side surface of the self-luminous traffic sign board 40, but may be installed on the back side. When light from a vehicle headlamp or the like incident from the outside of the self-luminous traffic sign board 40 is detected by the light sensor 21 at night, the downward illumination unit 41 is illuminated downward from the self-luminous traffic sign board 40. The road surface irradiation light C to be emitted is emitted. The light emitted from the road surface illumination light C based on the detection of light from the vehicle headlamp or the like by the optical sensor 21 may be performed in parallel with the light emission from the light emitting unit 15 or may be switched to the light emission from the light emitting unit 15. It may be. The light source of the downward irradiation unit 51 is preferably an LED.

  As described above, according to the fourth embodiment of the present invention, the self-luminous traffic sign board 40 receives light from a vehicle headlamp or the like incident from the outside of the self-luminous traffic sign board 40 by the light sensor 21 at night. When detected, the downward irradiation unit 41 is caused to emit road surface irradiation light C that irradiates the downward direction of the self-luminous traffic sign board 40. As a result, in addition to the effects of the second and third embodiments, when light from a vehicle headlamp or the like is detected by the light sensor 21 at night, the road illumination light C is emitted, and the self-luminous traffic sign board 40 is emitted. It is possible to provide a self-luminous traffic sign board 40 capable of notifying a pedestrian in the vicinity of a temporary stop or the like where the vehicle is installed or approaching a pedestrian.

  FIG. 7 shows a self-luminous traffic sign board 50 according to the fifth embodiment of the present invention. In FIG. 7, the parts denoted by the same reference numerals as those in FIG. As shown in FIG. 7, the self-luminous traffic sign board 50 is installed on the column 42, and is connected to the optical sensor 21 on the outer periphery of the self-luminous traffic sign boards 20, 30, and 40 of the second to fourth embodiments. It is the structure which added together the warning light (front direction irradiation part) 51a, 51b, 51c etc. (henceforth "attention light 51a etc."). As shown in FIG. 7, the side-by-side installation is performed by storing in a storage container (not shown) attached to the housing 52 of the self-luminous traffic sign board 50. In FIG. 7, for convenience of explanation, only three warning lights 51a and the like are provided with symbols, but other small lights shown side by side with the warning lights 51a and the like on the outer periphery of the self-luminous traffic sign board 50. A circle is also a warning light. When the light sensor 21 detects light from a vehicle headlamp or the like incident from the outside of the self-light emitting traffic sign board 50 at night, the front direction of the self-light emitting traffic sign board 50 is detected. To emit light. The light emitted from the warning light 51a or the like based on the detection of light from the vehicle headlamp or the like by the optical sensor 21 may be performed in parallel with the light emitted from the light emitting unit 15 or switched to the light emitted from the light emitting unit 15. You may do it. The light emission color of the warning light 51a and the like is preferably red. The light emitted from the warning light 51a and the like is preferably blinking (high-speed blinking), and the blinking cycle may be changed as appropriate.

  In the self-luminous traffic sign board 50 described above, a storage container is provided as described above on the lower side of the self-luminous traffic sign board 50, and an infrared sensor (not shown) for detecting infrared rays is further stored in the storage container. In addition, when a pedestrian in the vicinity of the self-luminous traffic sign board 50 is detected by the infrared sensor at night, light that irradiates the front direction of the self-luminous traffic sign board 50 may be emitted. A voice output unit (not shown) is further installed on the self-luminous traffic sign board 50, and a pedestrian near the self-luminous traffic sign board 50 is detected by an infrared sensor at night (preferably in the daytime). In this case, a light that illuminates the front direction of the self-luminous traffic sign board 50 is emitted (or separately from the light emission), and a desired message informing the approach of the vehicle is output from the audio output unit to the pedestrian side. May be.

  As described above, according to the fifth embodiment of the present invention, the self-luminous traffic sign board 50 receives light from a vehicle headlamp or the like incident from the outside of the self-luminous traffic sign board 50 by the light sensor 21 at night. If detected, light is emitted that illuminates the front direction of the self-luminous traffic sign board 50. As a result, in addition to the effects of the second to fourth embodiments, when light from a vehicle headlamp or the like is detected by the light sensor 21 at night, light that illuminates the front direction is emitted to generate a self-luminous traffic sign. It is possible to provide a self-luminous traffic sign board 50 that can inform the driver of the vehicle that a pedestrian is in the vicinity of a temporary stop or the like where the board 50 is installed and call attention.

  Furthermore, according to the fifth embodiment of the present invention, when an infrared sensor is installed on the lower side of the self-luminous traffic sign board 50 to detect infrared rays, and a nearby pedestrian is detected by an infrared sensor at night. , Emitting light that illuminates the front direction of the self-luminous traffic sign board 50 to inform the driver of the vehicle that there is a pedestrian near the temporary stop where the self-luminous traffic sign board 50 is installed, A self-luminous traffic sign board 50 that can call attention can be provided.

  In addition, according to the fifth embodiment of the present invention, an audio output unit is further installed on the self-luminous traffic sign board 50, and a nearby pedestrian is detected by an infrared sensor at night (preferably in the daytime). In this case, it is possible to provide a self-luminous traffic sign board 50 that can output a desired message informing the approach of the vehicle from the audio output unit to the pedestrian side, thereby alerting the pedestrian.

  In the self-luminous traffic sign board of Examples 1 to 5 described above, the one processed according to the display of a sign different from the predetermined sign formed on the retroreflective sheet 12 as the dot-like reflecting portion 14a or the like is used. You can also. In this case, the light emitting unit 15 does not emit light in the daytime, but because it is bright, a predetermined sign formed on the retroreflective sheet 12 can be displayed. The sign can be luminescently displayed. That is, different signs can be displayed day and night. When the light emitting unit 15 does not emit light at night (when the light is blinking and turned off) and there is retroreflection (light Bref) by the light B of the vehicle headlamp, a predetermined sign can be displayed, When the light emitting unit 15 emits light, a sign different from the predetermined sign can be displayed. That is, different signs can be alternately displayed at night.

  As described above, according to the sixth embodiment of the present invention, the dot-like reflecting portion 14a or the like is processed according to the indication of a sign different from the predetermined sign formed on the retroreflective sheet 12. You can also. As a result, a predetermined sign formed on the retroreflective sheet 12 can be displayed during the daytime, and a sign different from the predetermined sign can be displayed by light emission from the light emitting unit 15 at night. That is, it is possible to provide a self-luminous traffic sign board that can display different signs day and night.

  FIG. 8 shows a cross-sectional view of the self-luminous traffic sign board 60 in Embodiment 7 of the present invention. In FIG. 8, portions denoted by the same reference numerals as those in FIG. The self-luminous traffic sign board 60 is different from the self-luminous traffic sign board 10 in the first embodiment in that the light guide plate 13 is prevented from scattering when the light guide plate 13 receives an impact. 61 is affixed to the surface side of the light guide plate 13. Although FIG. 8 shows an example in which the scattering prevention sheet 61 is pasted on the surface of the light guide plate 13 of the self-luminous traffic sign board 10 in the first embodiment, the self-luminous traffic sign boards 10 and 20 in the first to sixth embodiments. Of course, the scattering prevention sheet 61 may be affixed to the surface of the light guide plate 13.

  As described above, according to Example 7 of the present invention, the scattering prevention sheet 61 was attached to the surface side of the light guide plate 13 of Examples 1 to 6. As a result, in addition to the effects of the first to sixth embodiments, it is possible to provide a self-luminous traffic sign board 60 that can prevent the light guide plate 13 from scattering when the light guide plate 13 receives an impact.

  As an application example of the present invention, the present invention can be applied to regulation signs, warning signs, guidance signs, instruction signs, auxiliary signs, and the like.

  10, 20, 30, 40, 50, 60 Self-luminous traffic sign board of the present invention, 11, 71 Back plate, 12 Retroreflective sheet (total reflection type), 13, 72 Light guide plate, 14a, 14b, 14c Dot shape Reflection part, 14as, 14bs Reflection surface, 14ap, 14bp height, 15 Light emission part, 21 Photosensor, 31 Dot-shaped reflection part for light reception, 41 Downward irradiation part, 42 Prop, 51a, 51b, 51c Warning light, 52 Case, 61 scattering prevention sheet, 70 conventional self-luminous traffic sign board, 73 transparent acrylic board, 74 retroreflective sheet (semi-transmissive type), 75 LED.

JP 2010-2650 A

Claims (8)

A self-luminous traffic sign board powered by solar cells,
A total reflection type retroreflective sheet on which a predetermined sign is formed;
A light guide plate provided on the surface side of the self-luminous traffic sign board in combination with the retroreflective sheet, and a dot-like reflecting portion superimposed on a display outline of the predetermined sign on the inner surface of the retroreflective sheet side What was processed,
A light-emitting unit provided on a peripheral side end surface of the light guide plate and using a solar cell as a power source;
A self-luminous traffic sign board characterized in that the predetermined sign is lit and displayed by reflecting light emitted from the light-emitting part to the outside of the self-luminous traffic sign board by the dot-like reflecting part.   2. The self-luminous traffic sign board according to claim 1, wherein an optical sensor that detects light reflected from the dot-like reflection portion and incident from the outside of the self-luminous traffic sign board on the peripheral side end face of the light guide plate. A self-luminous traffic sign board further comprising:   The self-luminous traffic sign board according to claim 2, further comprising a dot-like reflecting portion different from the dot-like reflector, which reflects light incident from the outside of the self-luminous traffic sign board. A self-illuminating traffic sign board.   The self-luminous traffic sign board according to claim 2 or 3, further comprising a downward illuminating unit connected to the optical sensor, wherein the downward illuminating unit is incident from outside the self-luminous traffic sign board by the optical sensor. A self-luminous traffic sign board that emits light that illuminates the lower direction of the self-luminous traffic sign board when detected light is detected.   5. The self-luminous traffic sign board according to claim 2, further comprising a front direction illumination unit connected to the optical sensor, wherein the front direction illumination unit is configured to emit the self-luminous traffic sign by the optical sensor. A self-luminous traffic sign board that emits light that illuminates the front direction of the self-luminous traffic sign board when light incident from the outside of the board is detected.   The self-luminous traffic sign board according to any one of claims 1 to 5, wherein the dot-like reflecting part is processed according to a sign display different from the predetermined sign, and the light emitting part emits light. A self-luminous traffic sign board, wherein the predetermined sign is displayed when not, and a sign different from the predetermined sign is displayed when the light emitting portion emits light.   The self-luminous traffic sign board according to any one of claims 1 to 6, further comprising a scattering prevention sheet on the light guide plate. 8. The self-luminous traffic sign according to claim 1, wherein the predetermined sign is a regulation sign, a warning sign, a guide sign, an instruction sign, or an auxiliary sign. Board.

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