KR-102963120-B1 - IN-GROUND PEDESTRIAN TRAFFIC LIGHT WITH FLOOR-TYPE WALKING SIGNAL LAMP DEVICE

Abstract

A floor-type pedestrian signal light according to the present invention comprises a main control unit and a display unit embedded below the ground surface to provide visual signal information to pedestrians, wherein the display unit comprises: a plurality of LED elements formed such that the light-emitting surface has a preset angle of inclination with respect to a reference plane parallel to the ground; a display unit upper cover having a plurality of holes formed on its bottom surface corresponding to the shape of the LED elements so that the plurality of LED elements can each be inserted and fixed; and a PCB substrate in which the plurality of LED elements are electrically connected and mounted, and which is in close contact with the inner surface of the display unit upper cover so that the inclined light-emitting surface of the LED elements is coupled through the holes.

Inventors

• 이시영

Dates

Publication Date

20260511

Application Date

20250610

Claims (7)

1. A floor-type pedestrian signal light comprising a main control unit and a display unit embedded below the ground surface to provide visual signal information to pedestrians, The above display unit is, A plurality of LED elements formed such that the light-emitting surface has a preset angle of inclination with respect to a reference plane parallel to the ground; An upper cover of a display part having a plurality of holes formed on its bottom surface corresponding to the shape of the LED elements so that the plurality of LED elements can each be inserted and fixed; A PCB substrate in which the plurality of LED elements are electrically connected and mounted, and which is in close contact with the inner surface of the upper cover of the display unit, wherein the inclined light-emitting surface of the LED elements is coupled through the hole; A first sensing sensor and a second sensing sensor connected to each of the red LED group input terminal and the green LED group input terminal on the PCB board to detect the voltage or current of the respective input terminal in real time; and An MCU-based reverse-lighting prevention circuit that performs the function of comparing actual lighting status information detected by the first and second detection sensors with a normal lighting command signal received from the main control unit, and if it is determined that the two pieces of information do not match and a reverse-lighting state is detected, cutting off power supply to both the red LED group and the green LED group and transmitting the information regarding the occurrence of the reverse-lighting state to an external traffic control center. Floor-type pedestrian signal light including
2. In paragraph 1, A floor-type pedestrian signal light characterized by the inclination angle of the light-emitting surface of the above-mentioned LED element being a value within the range of 5 to 20 degrees to optimize pedestrian visibility.
3. In paragraph 1 or 2, the above-mentioned display unit is, When a red lighting instruction signal is received from the above-mentioned main control unit, the red LED group of the above-mentioned display unit is lit and, at the same time, the green LED group of the above-mentioned display unit is prevented from being lit. A floor-type pedestrian signal light further comprising a non-illumination prevention unit that performs a control logic to illuminate a group of green LEDs in the display unit and simultaneously prevent the illumination of a group of red LEDs in the display unit when a green illumination instruction signal is received from the main control unit.
4. In paragraph 3, the above-mentioned non-fouling prevention unit is, A first LED driver that is activated by the above red lighting indicator signal to light up the red LED group and a first switching circuit that blocks the operation of the green LED group; and A second LED driver that is activated by the green lighting indicator signal to light up the green LED group and a second switching circuit that blocks the operation of the red LED group A floor-type pedestrian signal light characterized by including
5. delete
6. In paragraph 1, the above-mentioned reverse prevention circuit is, Each LED string circuit configured by connecting a plurality of LED elements in series on the PCB substrate further includes additional sensing sensors for detecting individual operating states. A floor-type pedestrian signal light characterized by the fact that the MCU further performs the function of analyzing information received from the additional detection sensors to determine whether a defect has occurred and the location of the individual LED string circuit, and transmitting the defect information to the external traffic control center.
7. In paragraph 1 or 2, the above-mentioned display unit is, A silicone O-ring or gasket made of an elastic material that is pressed against the joint boundary surface between the upper cover of the above-mentioned display part and the lower cover of the above-mentioned display part to perform a waterproof sealing function; and A mechanical coupling structure in which the upper cover of the above-mentioned display part and the lower cover are fastened using a plurality of screws or bolts. A floor-type pedestrian signal light characterized by further including

Description

{IN-GROUND PEDESTRIAN TRAFFIC LIGHT WITH FLOOR-TYPE WALKING SIGNAL LAMP DEVICE} The present invention relates to a floor-type pedestrian signal light, and more specifically, to a floor-type pedestrian signal light that prevents condensation and increases light efficiency through structural improvements of the display unit, is equipped with a detection and cutoff circuit capable of ensuring pedestrian safety in the event of a signal malfunction, and significantly improves waterproof performance and ease of maintenance. Since the National Police Agency established relevant standards in March 2019, the installation of ground-level pedestrian traffic lights has proceeded. However, in many cases, frequent defects occurred within one year of installation, leading to an increasing number of local governments suspending operations or operating them only on a limited basis. Furthermore, the related business is at risk of being almost completely halted by 2025. Ground-type pedestrian traffic lights generally consist of three main parts: an option board, a control unit, and a display unit. Among these, it is no exaggeration to say that failures in the display unit account for the majority of all malfunctions. While there is a wide variety of failures occurring in the display unit, representative examples include specific LED elements turning off, dual-lighting where red and green signals light up simultaneously, and reverse-lighting where the ground-type pedestrian signal lights up green when the main signal light is red, or conversely, the ground-type light lights up red when the main signal light is green. Meanwhile, the option board is an interface configured to communicate with the control unit by being inserted into a slot within an independently installed traffic signal controller. While other defects are also problematic, the reverse signal phenomenon, as shown in the photo in Fig. 1, is the most concerning type of defect as it can pose a serious risk to pedestrian safety. For example, since people walking while looking at their smartphones mainly look at the ground while walking, a dangerous situation may occur where they only perceive the green signal of the ground-type pedestrian signal and step onto the roadway even though the actual pedestrian signal is red. While technical differences between manufacturers or communication errors may contribute to the various causes of these defects, the most critical cause is analyzed to be moisture, specifically the penetration and impact of water. Since ground-level pedestrian traffic lights are installed below ground level—that is, underground—they are inevitably placed in an environment where they are constantly exposed to water during rainfall or snowfall. Furthermore, the display unit is generally designed with the surface tilted approximately 10 degrees toward the sidewalk to improve pedestrian visibility. FIG. 2 is a cross-sectional view of a floor-type pedestrian signal light having a honeycomb structure support member with a light-reflecting high-heat dissipation function as described in Registered Patent No. 10-2807607, comprising: a lower case part (100) having an internal space and an upper surface having a predetermined slope in one direction; a light-reflecting high-heat dissipation PCB assembly part (200) on the upper part of the lower case part (100) in which a red LED and a green LED are mounted on a light-reflecting high-heat dissipation substrate; an upper case part (300) covering the side and top of the light-reflecting high-heat dissipation PCB assembly part (200) and diffusing and emitting light emitted from the red LED and green LED; and a honeycomb structure that is coupled to the light-reflecting high-heat dissipation PCB assembly part (200) with a predetermined slope in a direction opposite to the slope direction of the lower case part (100), surrounds each of the red LED and green LED, has an open top so that the light emitted from the red LED and green LED is emitted upward, and supports while in contact with the inner upper surface of the upper case part (300). It comprises a support member (400), a damper member (500) that connects and fixes the light-reflecting high-heat dissipation PCB assembly member (200) and the lower case member (100), and a moisture discharge member (600) that discharges internal moisture and foreign matter to prevent micro-cracks in waterproofing liquids such as silicone and urethane caused by condensation and internal space expansion, thereby maintaining the product's prevention function. However, the inclined structure of this lower case part (100) inevitably forms a triangular empty space between the PCB on which the LED is mounted and the surface of the display part. This space provides an environment where condensation is likely to occur due to changes in seasons or sudden temperature differences caused by weather. Various electronic components used in display units are highly vulnerable to water. If water infi