JP5405385B2 - Self-luminous LED traffic sign - Google Patents

Description

  The present invention relates to a self-luminous LED (Light Emitting Diode) traffic sign. More specifically, the present invention relates to a self-luminous LED traffic sign that is lit at night by power generated and charged by a solar battery.

Conventionally, as this kind of self-luminous LED display device, for example, the one described in Patent Document 1 is known.
Specifically, as shown in FIG. 5, the self-luminous LED display device described in Patent Document 1 includes the light guide plate 103 around the light guide plate 103 in a case 102 having a transparent front plate 101. A plurality of display devices 105, 106,... Each having a lighting device 104 to illuminate are provided in a state in which their light guide plates 103 are sequentially overlapped with the front plate 101 in order.

  Furthermore, a color of a predetermined shape for displaying a display object such as a character, a symbol, or a figure is displayed on a part of the light guide plate 103 of the display 105 on the front side.

  In addition, on the back surface of the light guide plate 103 of the other display device 106, a color that appears forward through another part of the light guide plate 103 of the front display device 105 and is different from the color of the front display device 105. By displaying, the color of one light guide plate appears to float more strongly than the color of the other light guide plate.

JP 2000-330490 A

  In the self-luminous LED display device described in Patent Document 1 described above, a color shaped like a display object and a color different from this color are displayed on different light guide plates, and these are displayed by different light fixtures. Since it is illuminated and the color of the display object appears more strongly in the color, the visibility is improved.

  However, there is a problem in that the structure is complicated because the display objects of different colors are displayed on different light guide plates and are illuminated by different illumination tools (LED lights).

  In addition, since the different lighting fixtures are provided for the different light guide plates, the number of the lighting fixtures increases, and in the case of the self-luminous type using a solar cell, there is a risk of hindering the maintenance of the illumination at night.

  In addition, many traffic signs have a form in which a white “stop” character is applied to a red sign board such as an acrylic resin plate. In this case, the character portion is clear when light is emitted from a white LED element. It emits light in white. However, there is a problem that the red portion cannot produce a clear red color and the contrast with white is lowered.

  In addition, the number of usable LED elements is limited in the self-luminous LED using a solar cell, and the output power is lower than that of an external power source or a battery. There is a problem that is difficult to project.

  The present invention has been made in view of the above points, and an object thereof is to provide a self-luminous LED traffic sign that can realize the clearness of the color of the traffic sign with a limited number of LED elements. To do.

  In order to achieve the above object, a self-luminous LED traffic sign according to the present invention includes a housing having an opening, an LED element disposed inside the housing, and a sun disposed outside the housing. A battery, a label having a transparent plate covered in the opening of the casing, and a solid printed on the transparent plate with the marker character portion not printed, and a portion of the marker subjected to solid printing And a phosphor disposed on the surface.

  Here, the fluorescent material is disposed on the solid-printed portion of the marker that has been subjected to the solid printing in which the marker character portion is not printed on the transparent plate, so that the light wavelength is absorbed by the phosphor from the LED element. The color of the solid printing portion of the sign body is excited, and a clear color of the sign body is projected.

  Further, the solid-printed portion of the marker is substantially red, and the phosphor is substantially red, so that the phosphor is irradiated by the LED element and excited by the red color of the visible light to obtain a clear red color. It can be projected as.

  In addition, when the LED element is a white LED element, the light wavelength emitted from the white LED element is absorbed and excited by visible red light having a maximum excitation wavelength of 613 nm, and can be displayed as a clear red color. .

  Further, by providing a substantially white light diffusion substrate disposed on the side opposite to the fluorescent marker, a non-printed marker character is displayed as approximately white. In addition, even when the LED element is not lit or when lit, the traffic sign display unit is irradiated with a headlight of a vehicle or the like, so that incident light is reflected on the reflection sheet and the color of the sign body can be clearly displayed. It becomes possible.

  According to the self-luminous LED traffic sign of the present invention, the color of the traffic sign can be clarified even if the number of LED elements is limited.

It is a front schematic diagram for demonstrating an example of the self-light-emitting LED traffic sign to which this invention is applied. It is a side surface schematic diagram for demonstrating an example of the self-light-emitting LED traffic sign to which this invention is applied. It is explanatory drawing which shows an example of the self-light-emitting circuit of the self-light-emitting LED traffic sign to which this invention is applied. It is an internal cross-sectional schematic diagram for demonstrating an example of the self-light-emitting LED traffic sign to which this invention is applied. It is a schematic diagram which shows an example of the conventional traffic sign.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings to provide an understanding of the present invention.

  FIG. 1 is a schematic front view for explaining an example of a self-luminous LED traffic sign to which the present invention is applied. FIG. 2 is a schematic side view for explaining an example of a self-luminous LED traffic sign to which the present invention is applied. FIG. 3 is an explanatory view showing an example of a self-luminous LED traffic sign to which the present invention is applied, and FIG. 4 is an internal cross-sectional schematic diagram for explaining an example of the self-luminous LED traffic sign to which the present invention is applied. FIG.

  In the traffic sign 1 shown here, an LED element support board 3 is attached to a housing 2 made of a metal such as an aluminum alloy having an inverted triangle shape, and the traffic sign is clearly displayed on the LED element support board 3 at night. In order to obtain the illuminance to be projected, a plurality of LED elements 4 are arranged.

  Moreover, the solar cell 5 is installed in the upper end of the housing 2, The LED element 4 is lighted with the electric power generated by this solar cell. The electric power generated by the solar battery 5 is charged in the charging circuit 6.

  Here, for example, at night or when it rains, the LED element 4 is turned on with the electric power charged in the charging circuit 6. Specifically, power is supplied from the charging circuit 6 to the LED element 4 when the illuminance sensor detects that the illuminance is equal to or less than a set value.

  Each LED element 4 is a white LED element that emits pseudo white light by covering a blue LED chip with a yellow fluorescent material.

  Moreover, the self-light-emitting circuit for causing the LED element 4 to emit light includes a solar cell 5, a charging circuit 6, an LED lighting circuit 7, an LED display unit 8, and a control CPU 9, as shown in FIG.

  In the self-light-emitting circuit configured as described above, in the daytime, the electric power generated by the solar cell 5 by receiving sunlight is stored in a storage battery or a capacitor (not shown) incorporated in the charging circuit 6. Then, when the illuminance sensor (not shown) senses the illuminance that has fallen below the predetermined value due to sunset, the LED lighting circuit 7 is activated by the control CPU 9, and the LED display unit 8 uses the power stored in the storage battery or capacitor. Will be lit.

  Further, when the illuminance becomes brighter, the surroundings become brighter, and the illuminance sensor (not shown) senses the illuminance exceeding a predetermined value, the power supply from the charging circuit 6 to the LED lighting circuit 7 is cut off by the control CPU 9. The LED display unit 8 is turned off.

  A marker 13 is attached to the open end of the housing 2. Similar to the shape of the opening end of the housing 2, the marker body 13 is subjected to a solid printing 10 in which the marker character 16 portion is not printed on the transparent plate 12 formed of a synthetic resin material such as a substantially triangular acrylic resin. It has been configured.

  Here, as shown in FIG. 4, the periphery of the transparent plate 12 is left on the back surface (the surface on the LED element 4 side) of the transparent plate 12 of the marker body 13, and for example, a “stop” marker character 16 is provided. A red solid print 10 is applied in a non-printed state.

  Accordingly, the marker 13 has a transparent band on the periphery of an inverted triangular transparent body 12 printed with a red solid 10 and a transparent “stop” marker character 16 which is not printed in the transparent body 12. It is the displayed configuration.

  Further, the phosphor 14 is disposed on the red solid print 10 portion of the transparent body 12. Specifically, BASF Japan Ltd. A perylene-based red 305 fluorescent dye having a trade name “Lumogen” manufactured by the company is silk-printed on the solid print 10 portion.

  The phosphor 14 has physical properties of a maximum absorption wavelength of 578 nm and a maximum excitation wavelength of 613 nm, and is vividly excited by absorbing the light wavelength from the white LED element and exciting it into visible red light having a maximum excitation wavelength of 613 nm. Makes it possible to project a red color.

Here, in the light emission by the white LED element, since the wavelength is shorter than that of red, when the transparent plate printed in red is irradiated, sufficient illuminance by the LED element is required.
Therefore, by arranging the phosphor 14 on the solid print 10 portion of the marker 13, the light wavelength is absorbed from the white LED element and excited to the red of visible light, even if there is a limited number of LED elements. Sufficient self light emission is possible.

  Note that the solid printing in this embodiment is printed with a light-transmitting ink, and a colored transmissive film sheet may be used instead of the solid printing.

  In addition, although the LED element in a present Example does not necessarily need to be white, since a marker character is formed in a non-printed form on a red marker, a red marker and a marker character are not emitted when the LED element emits light. It is desirable to increase the contrast. For this purpose, it is desirable to use a white LED element.

  Further, a milky white light diffusion substrate 11 is polymerized on the surface of the marker 13 on which the phosphor 14 is disposed in order to diffuse the incident light from each LED element 4 and make the luminance uniform. .

  A light-transmitting reflective sheet 15 is provided on the surface of the light diffusing substrate 11 on the transparent plate 12 side, and the light diffusing substrate 11 is integrally bonded.

  Here, when the light diffusion substrate 11 is milky white, the transparent sign characters 16 that are not printed are displayed as white, and the incident light from each LED element 4 is the light diffusion substrate. Accordingly, the brightness of the entire surface of the light diffusion substrate 11 can be made uniform.

Further, the reflecting sheet 15 provided on the light diffusing substrate 11 allows the sign board 13 to be lifted by the light of the headlight of the vehicle or the like even when the light is not lit or when the light is lit.
That is, incident light is reflected on the reflection sheet 15 of the light diffusion substrate 11 through the transparent plate 12 of the marker plate 13, and excites the phosphor 14 arranged in the red solid print 10 portion provided on the transparent plate 12. By virtue of this, it is possible to bring out a vivid red color.

  The non-printed sign characters 16 are also clearly reflected by the reflected light from the reflection sheet 15 provided on the light diffusion substrate 11, and the white color of the “stop” portion of the sign characters 16 and the red color of the sign body 13 are displayed. It becomes possible to project the contrast with the printed part more clearly.

  In the self-luminous LED traffic sign of the present invention having the above-described configuration, the traffic sign 1 is attached to the upper part of a support pole (not shown) erected on the side of the road. And the solar cell 5 attached to the upper end surface of the housing 2 of the traffic sign 1 receives sunlight to generate electric power, and the generated electric power is charged by the charging circuit 6.

  Next, when the illuminance sensor (not shown) detects the illuminance below the set value due to sunset, the electric power charged in the charging circuit 6 is caused to flow through the LED lighting circuit 7 by the control CPU 9 and the housing. Each LED element 4 arranged on the LED element support substrate 3 in 2 is turned on.

  Here, the emitted light emitted from each of the white LED elements 4 is incident on the milky white light diffusion substrate 11, diffused over the entire surface of the light diffusion substrate 11, and incident on the transparent plate 12 of the marker plate 13. It becomes.

  In this case, the white LED element emits light with a mixture of blue and yellow, and therefore, when passing through a red filter, the red wavelength is lowered, causing a problem in displaying a clear red color. become.

  Therefore, the white LED emitted light that has entered the light diffusing substrate 11, is diffused over the entire surface of the light diffusing substrate 11, and is emitted to the transparent plate 12 of the marker plate 13 is reflected by the red LED applied to the transparent plate 12. It is made to absorb in the fluorescent substance 14 arrange | positioned at the solid printing 10 part.

  The phosphor 14 has physical properties of a maximum absorption wavelength of 578 nm and a maximum excitation wavelength of 613 nm, and the light wavelength is absorbed from the white LED element and excited by visible red light having a maximum excitation wavelength of 613 nm. By irradiating 10 portions of the print, it is projected as a clear red color.

  In this way, the white light incident on the transparent plate 12 of the marker plate 13 is emitted as it is with the “stop” portion of the marker character 16 that is not printed on the transparent plate 12 being applied to the transparent plate 12. The portion of the red solid print 10 thus absorbed is absorbed by the phosphor 14 and excited by the red color of visible light to be emitted as a clear red color.

  Therefore, the contrast between the white color of the “stop” portion of the marker character 16 and the red printed portion of the marker body 13 can be displayed more clearly.

  In addition, there are cases where sufficient light emission cannot be obtained due to the limited number of LED elements, such as a self-luminous LED traffic sign by a solar cell.

  However, the light emitted from each LED element 4 is uniformly diffused by the milky white light diffusing substrate 11 and excited by the phosphor 14 to the red color of visible light, so that a clear red marker 13 can be displayed. .

DESCRIPTION OF SYMBOLS 1 Traffic sign 2 Housing 3 LED element support substrate 4 LED element 5 Solar cell 6 Charging circuit 7 LED lighting circuit 8 LED display part 9 Control CPU
10 Solid printing 11 Light diffusion substrate 12 Transparent plate 13 Marking body 14 Phosphor 15 Reflecting sheet 16 Marking character

Claims (4)

A housing having an opening;
An LED element disposed inside the housing;
A solar cell disposed outside the housing;
A sign body that has a transparent plate that is covered with the opening of the housing, and that has been subjected to solid printing with the sign character portion not printed on the transparent plate;
A self-luminous LED traffic sign comprising: a fluorescent substance disposed on a solid-printed part of the sign. The self-luminous LED traffic sign according to claim 1, wherein the solid-printed portion of the marker is substantially red and the phosphor is substantially red. The self-luminous LED traffic sign according to claim 1, wherein the LED element is a white LED element. 4. The self-luminous LED traffic sign according to claim 1, comprising a substantially white light diffusion substrate disposed on a side opposite to the marker of the phosphor via a reflective sheet.

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