KR102374085B1 - Interior lighting road traffic signs that do not cause luminance variations - Google Patents

Abstract

The present invention relates to a road traffic sign which emits light by using an LED and, more specifically, to an internal illumination type road traffic sign in which a plurality of LED lamps are installed, which maintains an overall illuminance uniformly without partial blurring even if a part of the LEDs breaks down. The road traffic sign comprises a housing, a light emitting element, a reflection sheet, a reverse reflection sheet, an ultra-bright reflective paper, and an EC film.

Description

{Interior lighting road traffic signs that do not cause luminance variations}

The present invention relates to a road traffic sign that emits light using an LED, and more particularly, in an internally illuminated road traffic sign in which a plurality of LED lamps are built-in, even if some LEDs fail, partial blurring does not occur and the entire It relates to a road traffic sign so that the luminance can be maintained evenly.

In general, signs installed on roads are used to inform drivers of directions or cautions and warnings while driving. In places such as places where the distance is not sufficiently secured, internally illuminated road traffic signs with built-in LEDs are mainly used.

Since the internally illuminated road traffic sign has a built-in LED structure, there is no risk of malfunction due to the exposure structure compared to self-luminous road traffic sign products that directly expose the LED to the outside using an electric signboard or optical fiber, and it is a great advantage in waterproof and moisture-proof. There is this.

As disclosed in Korean Patent No. 10-1927032 (2018.12.03.), the structure of the internally illuminated road traffic sign minimizes light loss by using the reflective structure of the sheet while the light source module is embedded in the housing. The problem of this is that when the LED is used for a long period of time, not only does the overall luminance of the sign fall due to the failure of the LED, but as shown in FIG. is lowered

In particular, when there is a luminance deviation for each LED, the visibility degradation problem is further aggravated, and when the relevant part is a major part for notifying guidance or warning, accurate information cannot be provided to the driver and safety is greatly compromised. there is.

The present invention is to solve the above problems, and even if some LEDs fail because light emitted from the LED is diffusely reflected inside the housing, luminance compensation of the faulty part is made through diffuse reflection so that the blackening point is generated due to imbalance. and to keep the luminance of the entire sign uniform.

In addition, when the overall luminance value is reduced due to LED failure, the initially set luminance can be constantly maintained by increasing the current of each LED in proportion to the lowered luminance value to compensate for the luminance decrease.

The present invention as a technical idea for achieving the above object, the housing; a light emitting element provided in the housing while arranging a plurality of LEDs on a substrate on which a printed circuit pattern is formed; a reflective sheet provided around the LED to push the LED light forward; A retro-reflective sheet that is disposed to be spaced apart from the light-emitting element and transmits light to only a portion of the light-emitting element to display a display text, and a blocking unit is formed in the remaining areas except for the light-transmitting unit to reflect the light emitted from the light-emitting element toward the light-emitting element ; It is configured to include an ultra-high-brightness reflective paper laminated on the retro-reflective sheet and an EC film laminated to separate the display stationery area, wherein the light-emitting element is spaced apart from the light-emitting element, and LED light emitted from the light-emitting element A diffuse reflection layer is provided for scattering and diffusing the light reflected from the retro-reflective sheet, and the diffuse reflection layer is a resin layer coated with a liquid resin, and a plurality of beads are injected into the resin layer so that each bead is different from each other. It is an internally illuminated road traffic sign that does not cause luminance deviation, characterized in that diffuse reflection is induced by a plurality of fixed beads while being cured at a height.

In addition, in the light emitting element of the present invention, a plurality of LEDs 240 are arranged in a matrix form on a substrate, and the circuit pattern of the substrate is configured to be connected in parallel with two or more LEDs arranged around each LED to form a middle Even if one LED does not work, all the LEDs placed around it are operated normally.

In addition, according to the present invention, the light emitting element 200 includes a sensor unit for checking whether an LED provided inside the housing 100 is faulty based on a consumed current value or a luminance value, and the LED in order to maintain a luminance value greater than or equal to a reference value. An integrated controller that stores a voltage value or a current value according to the quantity, and gives a compensation instruction to the voltage and current controller when the fact that the LED provided inside the housing is faulty is confirmed through the sensor unit, and is normally set according to the instructions of the integrated controller A voltage-current controller that applies a constant voltage or current value to the light-emitting element as shown in the figure, and when a compensation instruction is received from the integrated controller, increases the voltage or current value applied to the light-emitting element above the standard value so that each LED emits light above the set value. will further include

The present invention uses a reflective sheet and a retro-reflective sheet to collect and emit light to the light-transmitting part of the character part, thereby generating high luminance with low power consumption. As the diffuse reflection effect does not darken parts and maintains the overall luminance uniformly, it is possible to prevent deterioration in visibility in advance. And since the structure for securing the incident angle of light is made of a very simple structure, it is possible to simply manufacture, install, and provide a sign with an improved function without significantly changing the structure of a conventional road traffic sign.

In addition, by utilizing a current controller that automatically increases the current per LED in case of an LED failure, the luminance measured outside the sign can be kept constant, so visibility is greatly improved to prevent safety accidents, and even when the sign is used for a long period of time, Because it does not require unnecessary maintenance for replacement or repair, it is very easy to manage and can greatly reduce management costs, as well as prevent functional deterioration due to long-term use and greatly improve quality.

1a and 1b are external views showing the LED failure state of a conventional road traffic sign, respectively;
Figure 2 is an external view showing the structure of the road traffic sign of the present invention;
3 is a cross-sectional view showing the internal structure of the road traffic sign of FIG.
4 is a cross-sectional view showing a structure in which light is scattered and diffused by the diffuse reflection layer of the present invention;
5A to 5C are exemplary views showing a state in which light is diffused by the diffuse reflection layer during normal or LED failure, and the overall luminance is uniform, but the brightness is weakened due to LED failure.
6 is a block diagram showing the internal configuration of a road traffic sign according to an embodiment of the present invention.

First, the terms used in the specification and claims of the present invention should not be construed as being limited to dictionary meanings, and on the principle that the inventor can appropriately define the concept of the term in order to explain his invention in the best way. Based on this, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, the configuration according to the embodiment described in the specification and the configuration shown in the drawings are only preferred embodiments of the present invention, and do not represent all the technical ideas of the present invention, so they can be substituted for these configurations at the time of filing. It should be understood that various implementations may be made by possible equivalents and modifications.

Hereinafter, specific details for carrying out the present invention will be described with reference to the accompanying drawings.

2 is a perspective view showing a structure of a road traffic sign according to an embodiment of the present invention, and FIG. 3 is a cross-sectional structural view showing the structure of a road traffic sign.

Referring to this, the road traffic sign of the present invention is installed using a bracket by a post-type structure using pillars, and the structure includes a housing 100, a light emitting element 200, a retro-reflective sheet 300 and , the ultra-bright reflective paper 400 and the EC film 500 may be included.

The housing 100 constitutes a frame of a road traffic sign, and may be installed as a post at a certain height using a bracket on a roadway or sidewalk, and may be provided in a rectangular or circular shape depending on the standard of the sign.

And inside the housing 100, the light emitting element 200 is provided on the inside with the base plate 120 as the center, and in particular, the reflective sheet 260 is provided around the light emitting element 200 to emit the LED 240 light. It is pushed forward to constitute the main road and at the same time to form the display text in a structure in which the retro-reflective sheet 300, the ultra-bright reflective paper 400, and the EC film 500 are stacked at a position spaced apart from the light-emitting element 200, It is to guide information on the road through this sign and configure it so that light can be displayed.

That is, the present invention is an internally illuminated sign having a light emitting element 200 inside the housing 100, and in particular, by using a reflective sheet and a retro-reflective sheet to collect light inside the housing and emit it as a display, the sealed It is waterproof and moisture-proof thanks to its structure, and high luminance is produced with low power consumption.

The retro-reflective sheet 300 is positioned to be spaced apart from the light-emitting element 200 and reflects most of the light emitted from the light-emitting element 200 back to the reflection sheet 260 of the light-emitting element 200, and only a portion of the light is reflected in the housing ( 100) The light that is transmitted to the outside and has not been transmitted to the outside is reflected forward by the reflective sheet 260 of the light emitting element 200 again to confine the light inside the housing to minimize light loss.

At this time, the retro-reflective sheet 300 may be a sheet having a high luminance retroreflection function that retroreflects light generated from the LED of the light emitting element 200 or a reflective sheet having a similar function may be used, in which case the retroreflection is emitted from the light source. It may mean reflecting the emitted light back to the light source.

The retro-reflective sheet 300 may be configured to include a light-transmitting part 320 and a blocking part 340 as a structure for discharging a portion of light to the outside of the housing 100 to display an indication text.

That is, the light is transmitted through the light-transmitting part 320 of the retro-reflective sheet 300 arranged to be spaced apart from the light-emitting element 200 in only a part of the area to display the display text, and the rest except for the light-transmitting part 320 . In the region, the blocking portion 340 is formed to retroreflect the light emitted from the light emitting element 200 back toward the light emitting element 200 to prevent light loss.

And to this end, the light-transmitting part 320 is cut in a shape corresponding to the display text of the EC film 500 centered on the ultra-high-brightness reflective paper 400 , and when overlapped, the light emitted from the light-emitting element 200 inside the housing 100 . As the light-transmitting part 320 penetrates and is expressed to the outside, the display text is emitted.

In addition, the ultra-high-brightness reflective paper 400 greatly improves the visibility of the display by inducing retroreflection when light is irradiated. ) to highlight only the indicated text relatively brightly.

At this time, the ultra-high-brightness reflective paper 400 may be displayed in white or other colors, and preferably, it is configured in a color contrasting with the EC film 500 to improve attention, visibility, and visibility.

On the other hand, the light emitting element 200 is provided on the front surface of the base plate 120 of the housing, and the light emitting element 200 has a plurality of LEDs mounted in a matrix form on a substrate on which a circuit pattern is formed. In order to prevent a blackening point or a difference in luminance, which is a phenomenon that occurs when some of the plurality of LEDs are broken, the luminance decreases in the corresponding area, the diffuse reflection layer 600 is provided. have more

4 is a cross-sectional view showing a structure in which light is scattered and diffused by the diffuse reflection layer of the present invention. Referring to this, the diffuse reflection layer 600 is disposed to be spaced apart from the light emitting element 200, and the light emitting element 200 ), as well as scattering and diffusing the light reflected from the retro-reflective sheet 300, so that the whole is shown with uniform brightness.

In addition, the diffuse reflection layer 600 may be composed of a transparent resin layer 620 applied to a certain thickness, and a plurality of irregular beads 640 fixed to the resin layer 620 .

That is, the resin layer 620 is a diffuse reflection layer in which a liquid resin is applied, and diffuse reflection is induced by a plurality of beads 620 fixed by injecting and curing a plurality of beads 640 to the resin layer 620 . (600) can be formed.

To this end, a resin layer 620 is formed by applying a fluorinated polyester or epoxy-based resin having a certain viscosity to the surface of the retro-reflective sheet 300 to a certain thickness, and then the resin layer ( 620), a large amount of beads 640 dried at high temperature and with a diameter smaller than 620 are put in, so that some beads are buried and some beads are hardened by hot air drying or UV drying in a protruding state.

At this time, the bead 640 is formed with a thick thickness of the sign while the beads 640 buried inside the resin layer and the beads 640 protruding out of the resin layer are irregularly arranged at different heights with the internal gas removed. Even if not, it is possible to diffuse the LED light that is irradiated in a straight line to the left and right.

Therefore, the present invention confines the light inside the housing 100 with the reflective sheet 260 and the retro-reflective sheet 300 and scatters the light left and right through the diffuse reflection layer 600 to diffuse it, so that some of the plurality of LEDs are Even in the event of a breakdown, the luminance of the entire sign can be maintained uniformly without blackening spots.

Figure 5a shows the appearance of the sign when all LEDs operate normally, and Figure 5b shows the appearance of the sign operating with uniform luminance as light is diffused left and right by the diffuse reflection layer when some LEDs among all LEDs are broken 5c shows the appearance of a road traffic sign operating with uniform luminance as light is scattered and diffused left and right by the diffuse reflection layer when a number of LEDs among all LEDs fail, and FIG. 6 shows the uniformity lowered when the LED fails It shows the configuration for compensating for the luminance value.

When described with reference to this, the present invention confines light inside the housing 100 with the reflective sheet 260 and the retro-reflective sheet 300 and scatters the light left and right through the diffuse reflection layer 600 to diffuse it. Even if the LED fails, it can keep the overall luminance of the sign uniform. However, if some LEDs among all LEDs do not work, the overall brightness (brightness) of the sign decreases as the amount of LED light decreases.

Therefore, even if the overall brightness (luminance) of the sign is weak during the dark night, the signs on the sign board can be identified normally because the surroundings are dark. there may not be

Accordingly, the light emitting element 200 arranges a plurality of LEDs 240 in a matrix form on the substrate 220 and at the same time parallelizes the circuit pattern of the substrate 220 with two or more LEDs arranged around each LED. By configuring it to be connected, even if one LED does not operate in the middle, all the LEDs located in the vicinity receive current normally, and at least all the LEDs in the vicinity operate normally.

And in order to compensate for the luminance value in case of LED failure, the voltage and current controller 830 , the integrated controller 800 , and the communication unit 810 or the sensor unit 820 are included.

At this time, the sensor unit 820 is to check whether the LED of the light emitting element 200 provided in the housing has failed, and according to an embodiment, whether the LED has failed through the amount of current or power consumed through all LEDs when voltage is applied. and, according to an embodiment, when the luminance value of the sign is lowered, it is determined whether the LED provided inside the housing is fixed.

In addition, when the communication unit 810 confirms that some LEDs among all the LEDs provided in the housing have failed through the sensor unit, the communication unit 810 reports the failure to the designated control center by the integrated controller. In this case, depending on the embodiment, it is possible to receive a control command from the control center and apply the control command to the integrated controller to take a designated action.

In addition, the integrated controller 800 converts a voltage value or a current value according to the quantity of LEDs into a data set in order to maintain a luminance value greater than or equal to a reference value according to the regulations of the National Police Agency, so that it can be checked when necessary. In addition, when the integrated controller 800 determines that the LED provided inside the housing has failed through the sensor unit 820 , the voltage to be compensated according to the number of failed LEDs based on the luminance value or the amount of power/power consumed After calculating the value or current value, it is applied to the voltage and current controller 830 . At this time, the integrated controller 800 may control the communication unit 810 to report the failure to a designated control center.

And this integrated controller 800 can be safely driven by receiving external power supply through the power supply unit 730, but to minimize power consumption, a solar panel 700 is installed around the base plate 120 or the poles. And, it is also possible to use the power obtained through the solar panel 700 during the cold time by charging the rechargeable battery 720. In this case, a solar charge controller 710 for controlling charge/discharge is further included between the solar panel 700 and the rechargeable battery 720 to prevent overcharging.

In addition, the voltage and current controller 830 applies a constant voltage or current value to the light emitting element 200 as normally set according to the instruction of the integrated controller 800 to uniformly operate all LEDs, and the integrated controller 800 ), when a compensation instruction is received, the voltage value or current value applied to the light emitting element 200 is increased to cause each LED to emit light above the set value. At this time, the LED is made by a stepwise increasing voltage value (eg, 9, P 10v, 11v, 12v) or a current value, and according to an embodiment, a current value applied by a corresponding amount based on the compensation value associated through the integrated controller Alternatively, the voltage value may be increased.

Therefore, even if the LED provided inside the housing 100 fails, it is possible to prevent the luminance of the entire sign from being lowered below the reference value and to maintain a constant luminance while continuously maintaining the luminance value that meets the road sign regulations. .

So far, the present invention has been described with reference to the accompanying drawings, which are merely exemplary, and those of ordinary skill in the art to which it pertains can easily practice various modifications and equivalents therefrom. will be. Therefore, the true technical protection scope of the present invention should be defined by the claims.

100: housing 120: base plate
200: light emitting element 220: substrate 240: LED
260: reflective sheet
300: retro-reflective sheet 320: light-transmitting unit 340: blocking unit
400: ultra-bright reflective paper
500: EC film
600: diffuse reflection layer 620: resin layer 640: beads
700: solar module 710: charge/discharge controller 720: rechargeable battery
730: power unit
800: integrated controller 810: communication unit 820: sensor unit
830: voltage current controller

Claims (4)

housing 100; a light emitting element 200 provided in the housing and having a plurality of LEDs connected in parallel to a substrate 220 on which a printed circuit pattern is formed are arranged in a matrix; a reflective sheet 260 provided around the LED to push the LED light forward; It is disposed to be spaced apart from the light emitting element 200, and the light transmitting part 320 transmits light to only some areas to display the display text, and the blocking part 340 is formed in the remaining areas except for the light transmitting part 320, a retro-reflective sheet 300 for reflecting the light emitted from the light-emitting element 200 toward the light-emitting element 200; It is configured to include an ultra-bright reflective paper 400 laminated on the retro-reflective sheet 300, and an EC film 500 laminated to separate the area of the display text,
In the retroreflective sheet 300, a resin layer 620 coated with a liquid resin and a plurality of beads 640 are put into the resin layer 620 so that each bead 640 is cured at different heights. A diffuse reflection layer 600 that scatters the LED light and the light reflected by the retro-reflective sheet 300 by a plurality of fixed beads 640 and diffuses to the surroundings is provided,
The light emitting element 200,
The sensor unit 820 for checking whether the LED provided inside the housing 100 is faulty based on the consumed current value or the luminance value, and the voltage value or current value according to the quantity of LEDs to maintain the luminance value above the reference value. The integrated controller 800, which gives a compensation instruction to the voltage and current controller 830 when it is confirmed that the LED provided in the housing 800 is broken through the sensor unit 820, and the integrated controller ( 800), when a constant voltage or current value is applied to the light emitting element 200 as normally set, and a compensation instruction is received from the integrated controller 800, the voltage value or current applied to the light emitting element 200 more than the reference value An internally illuminated road traffic sign that does not generate luminance deviation, characterized in that it further comprises a voltage and current controller (830) that increases the value so that each LED emits more than a set value. The method of claim 1,
The diffuse reflection layer 600 is disposed under the retro-reflective sheet 300 so that even if a part of the LED fails, a blackening point does not occur and the brightness of the entire sign can be uniformly maintained. No internally illuminated road traffic signs.


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