JP2013126786A - Omnidirectional warning light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an omnidirectional warning light which can display a substantially spherical shape even if viewed from any direction of 360°, has simple structure and has an easy fabrication process.SOLUTION: A number of conical pores are formed on light guide plates 1-1 to 1-24, the light of an LED light emission source is applied from upper and lower sides of the light guide plates 1-1 to 1-24, reflected on boundary surfaces between the light guide plates and the conical pores, and thereby, the light of LED is displayed from surfaces of the light guide plates 1-1 to 1-24. A number of the conical pores are arranged in a semicircle on each light guide plate 1-1 to 1-24, reflection light by means of a number of the conical pores is output horizontally and the substantially-spherical red color display can be achieved even if viewed from any direction of 360°.

Description

  The present invention can be applied to an omnidirectional warning lamp that displays a warning so that it can be seen as a circle from any direction, and more specifically, to a railway crossing warning light installed at a railway crossing to notify the approach of a train. Regarding omnidirectional warning lights.

A crossing warning light as an omnidirectional warning light is a warning light that flashes red to indicate that a train is crossing a crossing and a vehicle that crosses the crossing. A lamp is installed as a set.
Several level crossing warning lights have been proposed as this type of conventional example.
In one example, a plurality of red light emitting LED mounting boards are attached to a board mounting frame forming a polyhedron, and a polyhedral structure is formed by a combination of LED mounting boards attached to the board mounting frame. A rectangular LED mounting substrate on which a large number of LEDs are mounted is a polyhedron-shaped shape that faces in all directions as a light emitting surface of a flashlight.

  In another example, in order to enable visual recognition from all directions of 360 degrees, a plurality of LED substrates on which a large number of LEDs are mounted in a semicircular shape on both sides are arranged at equiangular intervals.

JP 2010-179664 A JP 2005-247133 A

  The example described in the paragraph 0002 above requires a complicated board mounting frame for forming a multi-sided shape in order to arrange the LED mounting board in a multi-sided shape so as to be visually recognized from each direction of 360 degrees. Therefore, there is a disadvantage that the structure is complicated and it is difficult to efficiently assemble the manufacturing process.

In the example described in the paragraph 0003, LED substrates must be arranged radially, and a large number of LEDs must be arranged in a semicircular shape on both the front and back surfaces of each substrate. Therefore, the efficiency of use as a warning light is not fully utilized while using the LED with low power consumption.
The object of the present invention is to realize an omnidirectional warning lamp by means completely different from the above-mentioned existing omnidirectional warning lamp, and to solve the above problems together. In the present invention, a plurality of conical holes are formed in the transparent light guide plate, a plurality of transparent light guide plates processed with the conical holes are arranged radially, and LEDs are arranged on the side portions of the transparent light guide plate to emit LED light. Accordingly, it is an object of the present invention to provide an omnidirectional warning lamp that can realize a substantially spherical display when viewed from any direction of 360 degrees and has a simple structure and an easy manufacturing process.

In order to achieve the above object, claim 1 of the present invention is an omnidirectional warning lamp utilizing reflection of light, wherein a plurality of conical holes are provided on the surface of the transparent light guide plate, and side portions of the transparent light guide plate are provided. A plurality of LEDs are arranged on the surface, the light emitted from the plurality of LEDs is guided into the transparent light guide plate from the side of the transparent light guide plate, and the light from the led LEDs is guided at the boundary surface with the conical hole. A display using reflected light is configured by reflecting and emitting the reflected light from a surface opposite to the surface having a large number of conical holes of the transparent light guide plate.
According to a second aspect of the present invention, in the first aspect of the invention, the two transparent light guide plates in which the plurality of conical holes are formed are butted so that the conical holes face each other. The light emitted from the LEDs disposed on the side portions is reflected at the boundary surface with the conical hole, whereby the light is emitted from both sides of the two transparent light guide plates that are butted together.
According to a third aspect of the present invention, in the first or second aspect of the invention, the transparent light guide plate is rectangular, and the plurality of conical holes are arranged in a semicircular shape, and the conical shape is arranged in the semicircular shape. The two transparent light guide plates provided with the holes are abutted so that the respective conical holes face each other to form a rectangular display body, and LEDs are arranged on the upper and lower sides of the display body, A plurality of the display bodies are arranged so that one side on the diameter side of a semicircle formed by a conical hole is abutted and arranged radially at a predetermined interval within a range of 360 degrees, so that light is emitted from any direction. The configuration is such that the shape of the light can be visually recognized as a substantially spherical shape.
According to a fourth aspect of the present invention, in the invention according to the third aspect, a printed wiring board for arranging LEDs is provided above and below the display body, and a cavity is formed on the side where the radially arranged display bodies face each other. The wirings of the upper and lower printed wiring boards are inserted into the cavity, and the upper and lower printed wiring boards are connected.
According to a fifth aspect of the present invention, in the first, second, third, or fourth aspect, the transparent light guide plate is made of methacrylic resin, and the conical hole is formed by dimple processing.
According to a sixth aspect of the present invention, in the invention according to the first, second, third, fourth or fifth aspect, the top of the conical hole is approximately 90 degrees, and the traveling direction of the light of the LED guided into the transparent light guide plate When the transparent light guide plate is arranged vertically by changing approximately 90 degrees, light is emitted in the horizontal direction to improve visibility.
According to a seventh aspect of the present invention, in the first, second, third, fourth, fifth or sixth aspect, the distance from the side portion where the LED of the transparent light guide plate is disposed to the formation of the conical hole is reduced. For example, by reducing the size of the conical hole and increasing the shape of the conical hole as the distance increases, the light reflected by each of the many conical holes formed in the transparent light guide plate It is characterized by a small difference in brightness.

  According to the said structure, the illumination surface of LED can be equalized compared with the level crossing warning light by a direct light emission source. In addition, energy-saving and inexpensive equipment can be manufactured, and a spherical display can be seen from all directions. Furthermore, the present invention can be applied not only to a railroad crossing warning light but also to a display using an LED, and a three-dimensional expression is possible.

It is a main lineblock diagram of a level crossing warning light which shows an embodiment of an omnidirectional warning light by the present invention, and is a perspective view of an indicator part of a level crossing warning light. It is a figure for demonstrating the detail of the light-guide plate of the display of FIG. FIG. 3 is a detailed view of a conical hole formed in the light guide plate of FIG. 2. It is sectional drawing which shows the state which faced | matched two light-guide plates of FIG. It is a disassembled perspective view of each component for demonstrating the assembly of the level crossing warning light concerning this invention. It is a figure which shows the detail of the LED element mounting part of the LED mounting board | substrate of a railroad crossing warning light concerning this invention. It is a figure for demonstrating the detail of a structure of the outer frame cylinder of a level crossing warning light concerning this invention. It is the front view which partially fractured and showed embodiment of the level crossing warning light concerning this invention. It is a figure for demonstrating the connection structure of the cable of the LED mounting board | substrate of the lower part of the level crossing warning light concerning this invention. It is a general view of a railroad crossing alarm column equipped with a railroad crossing warning light according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a main configuration diagram of a crossing warning light showing an embodiment of an omnidirectional warning light according to the present invention, and is a perspective view of a display portion of the crossing warning light. FIG. 2 is a detailed view of the light guide plate of the display of FIG.
The light guide plate 1 is a rectangular plate-like transparent body, and methacrylic resin is used. The light guide plate 1 is provided with a large number of conical holes 101, and the conical holes 101 are arranged in a semicircular shape as shown in FIG. The LED illumination light is irradiated into the light guide plate 1 from the surfaces of the upper portion 102 and the lower portion 103 of the light guide plate 1. The conical hole 101 is formed so as to be smaller at a position close to the upper side portion 102 and the lower side portion 103 of the light guide plate 1 and to increase as the distance increases.
The conical hole 101 is arranged in this manner without the LED light incident from the upper part 102 and the lower part 103 being interrupted by the conical hole 101 formed in the middle. This is because a larger amount of light reaches the vicinity of the central portion 104. As a result, the light reflected from the conical holes on the entire surface of the light guide plate 1 corresponding to the shape in which the conical holes 101 are arranged has a small difference in brightness and uniform light. The light emission display surface of the light guide plate close to can be formed.

The distances L1 and L2 at which the conical holes 101 are formed from the upper side portion 102 and the lower side portion 103 are constant so that the display portion by the LED illumination light appears to be floating in a spherical shape when viewed from any position in all directions. It is necessary to take the dimensions.
Two light guide plates 1 shown in FIG. 2 are abutted so that the formation surfaces of the conical holes 101 face each other to form a pair of light guide plates, and the pair of light guide plates 1-1, 1-2, 1- 3, 1-4 to 1-23, 1-24 (12 sheets in total) are arranged radially around the entire circumference of 360 degrees at equiangular intervals with the longitudinal sides of the pipe center axis 16 aligned. 1 is configured.

FIG. 3 shows the details of the conical hole.
The apex angle of the conical hole 101 is a right angle, and the apex angle extends to the vicinity of the opposite surface of the light guide plate 1 (relative to the surface on which the conical hole 101 is formed). Therefore, the light that has propagated through the light guide plate 1 and entered the boundary surface between the light guide plate 1 and the conical hole 101 is emitted from the opposite surface of the light guide plate 1 in a perpendicular direction. This is shown in FIG. The LED light incident on the pair of light guide plates 1-1 and 1-2 is emitted from the surface opposite to the formation surface of the conical hole 101 of the light guide plates 1-1 and 1-2, respectively. It can be visually recognized from both surfaces of a pair of light guide plates.

FIG. 5 is an exploded perspective view of each part for explaining the assembly of the railroad crossing warning light according to the present invention.
Light guide plate pressing plates (inner sides) 3a and 3b for pressing the upper side portion and the lower side portion of the display device 2 have a disc shape, and the upper side portions of the display device 2 are arranged on the pressing plates 3a and 3b. And the radial penetration groove | channel 301 for penetrating a lower side part is provided. Further, the light guide plate pressing plates (outside) 4a and 4b for pressing the light guide plate pressing plates (inside) 3a and 3b from above are formed in a disk shape slightly larger than the light guide plate pressing plates (inside) 3a and 3b. 4a and 4b are provided with radial through grooves 401 at positions corresponding to the through grooves 301.

  A large number of LED elements 501 arranged in a straight line at positions corresponding to the through grooves 301 and 401 are mounted on the disk-shaped LED mounting substrates 5a and 5b. The LED element 501 is connected to a wiring pattern (not shown) formed on the LED mounting boards 5a and 5b so that a power supply voltage for LED blinking control is supplied. Terminals 502a and 502b attached to the opposite surfaces of the LED mounting substrates 5a and 5b on the LED mounting are connection portions for connecting the cable 17 (see FIG. 9) from the outside.

  The shaft fixing brackets 6a and 6b are fixed from above and below in order to complete the display assembly. The light guide plate holding plates 3a, 3b, 4a, 4b, the LED mounting substrates 5a, 5b, and the shaft fixing brackets 6a, 6b have through holes for inserting the pipe center shaft 16 in the center. The pipe center shaft 16 has shaft end portions 161 and 162 projecting upward and downward of the display 2. The shaft end portions 161 and 162 are inserted into the holes of the light guide plate holding plates 3 a and 3 b, and the figure is viewed from above. 7 (b) is covered, and the shaft end portions 161 and 162 are inserted into the holes of the light guide plate pressing plates 4a and 4b, the LED mounting substrates 5a and 5b, and the shaft fixing brackets 6a and 6b in this order. The indicator assembly is completed by tightening the nuts 8a and 8b via the plain washers 7a and 7b to the screws provided on the shaft end portions 161 and 162.

FIG. 6 is a diagram showing details of the LED element mounting portion of the LED mounting board of the railroad crossing warning light according to the present invention.
The upper end portions (upper side portions) of the pair of light guide plates 1-1 and 1-2 are inserted into the through grooves 301 of the light guide plate presser plate (inner side) 3a, and the light guide plate presser plate (outer side) 4a passes therethrough. The grooves 401 are overlapped, and the LED elements 501 arranged in a row on the LED mounting substrate 5 a are positioned in the through groove 401. The light of the LED element 501 efficiently enters the light guide plate from the side portions of the light guide plates 1-1 and 1-2.

FIG. 7 is a diagram for explaining the details of the configuration of the outer frame of the railroad crossing warning light according to the present invention.
The outer frame tube 10 covers the periphery of the display device, and prevents rain or dust from entering the display device.
As shown in FIG. 7 (a), the outer cylinder 10 has a brown smoked cylindrical shape that transmits light. This color allows red light to pass through easily so that the light emitted from the LED looks like a predetermined red color. Waterproof packings 9 a and 9 b are fitted into the upper and lower edges of the outer frame cylinder 10. The inserted state is shown in FIG. The waterproof packings 9a and 9b are provided with cylindrical end receiving grooves 901 and 902, respectively, as shown in FIG. The display 2 is covered with the outer frame cylinder portion having such a configuration.

FIG. 8 is a partially cutaway front view showing an embodiment of a railroad crossing warning light according to the present invention.
The upper cover 12 is covered so as to cover the LED mounting substrate 5a and the shaft fixing bracket 6a at the upper part of the display 2 to which the outer frame cylinder 10 is attached, and the end inner peripheral surface 121 of the upper cover 12 is the light guide plate holding plate 4a. It is fitted and attached to the outer periphery 402. Further, a roof-shaped hood 11 is placed above the light guide plate holding plate 4a so that rain does not hit the display device 2. The hood 11 is fixed to the upper cover 12 with screws 111.
A connection seat 13 is fixed at the center of the upper cover 12. The connection seat 13 is a member for connecting to a later-described alarm column 20 (see FIG. 10), and a cable connected to the LED mounting board is drawn into the inside thereof.

  The lower cover 15 is covered so as to cover the LED mounting substrate 5b and the shaft fixing bracket 6b at the lower part of the display 2 covered with the outer frame tube 10, and the inner peripheral surface 151 of the end of the lower cover 15 is the light guide plate holding plate 4b. It is fitted and attached to the outer peripheral part 403. Further, in order to prevent rain from entering the lower cover 15, the lower cover presser 14 is attached to engage with the upper surface of the outer peripheral portion 403 of the light guide plate presser plate 4b. The lower cover retainer 14 is fixed to the lower cover 15 with screws 141.

FIG. 9 is a view for explaining the cable connection structure of the LED mounting board below the railroad crossing warning light according to the present invention.
The LED mounting board 5b and the shaft fixing metal fitting 6b are attached so that the light guide plate holding plate (outer side) 4b, the LED mounting board 5b and the shaft fixing metal fitting 6b are at a fixed interval, and the electrical performance of the LED mounting board 5b. Is secured. The configuration of the upper LED mounting substrate 5a is the same.
The cable 17 is drawn through the pipe center shaft 16 and is connected to the terminal 502b.

FIG. 10 is a general view of a railroad crossing alarm column equipped with a railroad crossing warning light according to the present invention.
Two railroad crossing warning lights 19 are mounted on the upper part of the alarm column 20 that stands on the side of the railroad crossing. When the train approaches, the signal information is transmitted to the railroad crossing warning light 19 through the cable, and the crossing warning light 19 starts to blink. If the train passes, the railroad crossing warning light 19 stops operating. Regardless of the position of the viewpoint 360 degrees around the alarm column 20, the display part of the level crossing warning light 19 appears to float in a spherical shape, and the position where the level crossing warning light 19 looks up instead of the horizontal position (arrows 21 and 22). ), The spherical shape of the display portion will not be seen as long as the angle is not obstructed by the lower cover 15.
In addition, when sunlight hits the railroad crossing warning light 19 and enters the side portion 105 (see FIG. 2) of the long side of the light guide plate 1, there is a possibility that the display appears to be lit by the incidence of the sunlight. In order to prevent this, light incident preventing means is provided so that sunlight does not enter the side portion 105 of the longitudinal side of the light guide plate 1. The surface of the side portion 105 is subjected to a surface treatment so that light does not pass through, or it is processed into a rough surface such as a satin surface to scatter incident sunlight, thereby preventing incidence or reflecting light to the side portion 105 Or an absorptive film is applied or affixed.

In the above embodiment, the light guide plate 1 has a rectangular shape, but the shape of the outer long side facing the long side on the pipe central axis side may be a curved shape instead of a straight line. Moreover, although the example of the surface of the upper side part and lower side part of the light-guide plate 1 which shows the side which irradiates LED illumination light is shown, only one side part of an upper side and a lower side may be sufficient. In such a case, the intensity of light seen from the outside is weaker than the light emitted from the surface of the light guide plate close to the side where the LED illumination light is not provided, compared with the case where the light is provided on both sides of the upper side and the lower side. If there is no problem, such a configuration is also possible.
Furthermore, although the example in which the top of the conical hole is 90 degrees is shown, the angle of the top is not necessarily 90 degrees, and other angles can be set to change the viewing direction.

In addition, an example was shown in which the shape created by a large number of conical holes was a semicircle. However, the shape is not limited to a semicircle, and other shapes such as a semi-ellipse and a half of a star can be used. is there. In addition, when it makes other shapes, it will not look spherical.
Although an example in which a pair of light guide plates is arranged at equal angles on the entire circumference is shown, the number of the pair of light guide plates is not limited to twelve, and may be more or less than this. For example, four to eleven may be arranged, but if the number is small, depending on the viewing direction, the shape of the display part may appear to be an elliptical sphere rather than three-dimensional. On the other hand, when the number of sheets is increased, the brightness of the display unit increases, and a more perfect sphere shape is obtained. However, it is necessary to determine the number of sheets in consideration of required performance and specifications.

  This is an omnidirectional warning light applicable to a railroad crossing warning light installed at a railroad crossing to notify the approach of a train.

1,1-1 to 1-24 Light guide plate 101 Conical hole 2 Display 3a, 3b Light guide plate holding plate (inside)
4a, 4b Light guide plate holding plate (outside)
5a, 5b LED mounting board 6a, 6b Shaft fixing bracket 7a, 7b Flat washer 8a, 8b Nut 9a, 9b Waterproof packing 10 Outer frame (transparent brown smoke color)
11 Hood 12 Upper cover 13 Connection seat 14 Lower cover holder 15 Lower cover 16 Pipe center shaft 17 Cable 19 Railroad crossing warning light 20 Alarm column

Claims (7)

An omnidirectional warning light that uses light reflection,
A plurality of conical holes are provided on the surface of the transparent light guide plate and a plurality of LEDs are arranged on the side of the transparent light guide plate,
The light emitted from the plurality of LEDs is guided from the side of the transparent light guide plate into the transparent light guide plate, the light from the led LED is reflected at the boundary surface with the conical hole, and the reflected light is An omnidirectional warning lamp comprising a display utilizing reflected light by emitting light from a surface opposite to a surface having a plurality of conical holes of a transparent light guide plate.   The two transparent light guide plates in which the plurality of conical holes are formed are abutted so that the conical holes face each other, and light from the LEDs arranged on the side portions of the two transparent light guide plates is transmitted to the conical shape. 2. The omnidirectional warning lamp according to claim 1, wherein light is emitted from both sides of the transparent light guide plate that are abutted to each other by reflecting at a boundary surface with the hole. The transparent light guide plate has a rectangular shape, the plurality of conical holes are arranged in a semicircular shape, and the two transparent light guide plates provided with the conical holes arranged in the semicircular shape are respectively conical. A rectangular display body is formed by facing so that the holes of each other face each other,
LEDs are arranged on the upper and lower sides of the display body,
A plurality of the display bodies are arranged so that one side on the diameter side of a semicircle formed by a conical hole is abutted and arranged radially at a predetermined interval within a range of 360 degrees, so that light is emitted from any direction. The omnidirectional warning light according to claim 1 or 2, wherein the light is configured to be visually recognized in a substantially spherical shape. Provide a printed wiring board for arranging LEDs above and below the display body,
A cavity is formed on the side where the radially arranged display bodies are abutted, the wiring of the upper and lower printed wiring boards is inserted into the cavity, and the upper and lower printed wiring boards are connected. The omnidirectional warning light according to claim 3.   5. The omnidirectional warning light according to claim 1, wherein the transparent light guide plate is made of methacrylic resin, and the conical hole is formed by dimple processing.   The top of the conical hole is approximately 90 degrees, and when the transparent light guide plate is disposed vertically by changing the light traveling direction of the LED guided into the transparent light guide plate by approximately 90 degrees, 6. An omnidirectional warning lamp according to claim 1, wherein the visibility is improved by emitting light.   If the distance from the side where the LED of the transparent light guide plate is arranged is short until the conical hole is formed, the conical hole is reduced, and the conical hole is increased as the distance increases. Accordingly, the light reflected by each of the plurality of conical holes formed in the transparent light guide plate has a small difference in brightness. The omnidirectional warning light described.

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