JP4782027B2 - LED unit for signal lamp with viewing angle limiting function - Google Patents

Description

  The present invention relates to a signal lamp LED unit having a viewing angle limiting function. Specifically, the present invention relates to an LED unit for a signal lamp device having a viewing angle limiting function capable of limiting the light emission range of the LED light source to the stop line at the intersection.

  As shown in FIG. 8, the LED type signal lamp 101 has a large number of LED lamps 102 mounted on a printed wiring board 110, and prevents reflection of black due to external light from the LED lamp 102 and the printed wiring board 110. A plate 103 is provided, and the front surface is covered with a transparent cover 104.

  Here, signal lights are basically designed to provide light distribution performance based on specifications stipulated by the National Police Agency, but at intersections in special situations such as junctions between roads and junctions between overpasses and sideways. In order to prevent misidentification of the signal, it is necessary to limit the light emission range from the signal lamp so that the signal can be recognized from a specific direction and lighting cannot be seen from other directions. As a mechanism for limiting such a viewing angle, a mechanism composed of several louvers (matte black paint) on the eaves of a signal lamp is often used.

  However, the light emission limiting light source of the signal lamp is a light source that emits uniform surface light, and has a problem in terms of cost because it has a structure with a louver outside the LED unit. There are limited issues. Furthermore, in the combination of the LED unit and the louver, there is a problem in that the visibility of the LED lamp deteriorates because it interferes with the louver at a position where the LED lamp lighting state is visible and shifts to an invisible area. .

  Therefore, as an LED unit provided with a light emission limiting mechanism, there is a signal lamp LED unit as shown in FIG. In this LED unit, a light distribution control plate 105A, 106A, 107A in which through holes 105, 106, 107 are formed at positions corresponding to the plurality of LED lamps 102 is arranged in front of the LED lamp 102, thereby allowing The light that travels in directions other than the corners is cut to obtain a desired light distribution characteristic (see Patent Document 1).

  Moreover, there exists what is shown in FIG. 10 as an LED unit for signal lamps aiming at preventing the reflected light by a western day. The LED unit includes LED lamps 102 mounted on a printed wiring board 110 and a light shielding plate 109 in which through holes 108 are formed at positions corresponding to the LED lamps 102. The light shielding plate 109 is the LED lamp 102. The center of each through-hole 108 of the light shielding plate 109 is decentered downward with respect to the center of each LED lamp 102 (see Patent Document 2).

JP 2002-197592 A (Abstract, FIG. 3)

Japanese Patent No. 3527178 (specification, FIG. 3)

  However, in the viewing angle limited LED unit according to Patent Document 1, by arranging several light distribution control plates on the front surface of the LED lamp, light directed to directions other than the viewing angle is cut out of the output light of each LED lamp. On the other hand, the closer to the signal light, the more limited the light distribution, which may make it difficult to see the vehicle near the intersection.

  Moreover, in the LED unit for signal lamps by the said patent document 2, by arrange | positioning in the state where the center of each circular through-hole provided in the light-shielding plate is eccentrically deviated downward with respect to the center of each LED lamp, Even if sunlight is incident and reflected by the printed wiring board, the reflected light is absorbed by the back surface of the light shielding plate, thereby reducing the influence of the reflected light of the printed wiring board. However, in reality, the surface of the printed wiring board has a very complicated shape, and there is a risk of emission from the through hole due to irregular reflection.

  Moreover, in the light distribution characteristic by the circular through-hole in the said patent document 1 and the patent document 2, as shown in FIG. 11, it is in the viewing angle range in the distance to the stop line of an intersection, and visual recognition of a signal lamp is possible. Although it can be done reliably, there is a risk that the field of view will be narrow near the stop line at the intersection, and will be outside the field of view range at the edge of the road or at the intersection, hindering the visibility of the signal lights.

  The present invention was devised in view of the above points, and has a viewing angle limiting function in which a light emission limiting plate for limiting the viewing angle to the intersection and releasing the viewing angle limitation from the vicinity of the intersection is incorporated. It aims at providing the LED unit for signal lamps provided with.

  In order to achieve the above object, an LED unit for a signal lamp device having a viewing angle limiting function according to the present invention is an LED unit used for a signal lamp device, and includes a plurality of LED lamps mounted on a printed wiring board. And an antireflection plate arranged in a state of being inserted through each LED lamp, and a light emission control plate in which a through hole is formed from the front to the bottom corresponding to each LED lamp, and At the position where the through hole corresponds to each LED lamp, the width diameter of the through hole is substantially the same diameter, and the shape is widened downward from this, or the lower lower end is opened wide.

  Here, by disposing the antireflection plate in a state of being inserted into each LED lamp, the incidence to the printed circuit board is blocked and the emitted light from the LED lamp is blocked by the light emission control plate. .

  In addition, at the positions corresponding to the LED lamps, the through holes formed in the light emission control plate have the same diameter, and the lower diameter is expanded downward, or the lower lower end is expanded. By opening, the viewing angle of the signal light is limited at the point before the intersection stop line, so that it can be prevented from being mistaken for other signal lights at the intersection in special circumstances, and at the point within the intersection from the intersection stop line By releasing the viewing angle restriction, it is possible to travel safely without losing sight of the lighting of the signal lamp.

  In addition, by making the through hole convex, triangular, or trapezoidal, the through hole is almost the same diameter as the LED lamp at a position where the elevation angle with the signal lamp is small, that is, at a point before the intersection (about 100 m). Thus, the viewing angle is limited to the minimum, and the viewing angle restriction is released by increasing the diameter of the through hole from the intersection stop line (about 15 m) where the elevation angle with the signal lamp is large.

  In addition, by forming the front surface of the antireflection plate or both surfaces of the light emission control plate in a black matte shape, when the sunlight is incident, it is absorbed by the light emission restriction plate front surface, and the light from the LED lamp It is absorbed by the back surface of the output limiting plate. Further, the light reflected without being absorbed is absorbed by the front surface of the antireflection plate, so that the effect of limiting the viewing angle can be enhanced.

  According to the LED signal lamp device having the viewing angle limiting function of the present invention, the viewing angle of the signal lamp is limited at the point up to the intersection stop line, and there is no misidentification with other signal lamps, and from the intersection stop line to the intersection The viewing angle restriction is canceled at a point in the vehicle to enable safe driving without losing sight of the lighting of the signal lamp.

  Also, the light emission restriction plate when sunlight is incident on the front surface of the antireflection plate and both surfaces of the light emission restriction plate by applying a black matte shape, or anti-reflective texture, flocking, or non-woven fabric. The light from the LED lamp is absorbed by the front surface, and is absorbed by the back surface of the light emission limiting plate. Further, the light reflected without being absorbed is absorbed by the front surface of the antireflection plate, so that the effect of limiting the viewing angle can be enhanced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings to provide an understanding of the present invention.
1 is a front explanatory view showing an example of an LED unit for a signal lamp device having a viewing angle limiting function to which the present invention is applied, FIG. 2 is a side cross-sectional explanatory view in FIG. 1, and FIG. 3 is a partially enlarged cross section in FIG. 4 and 4 are partially enlarged explanatory views of the light emission limiting plate of the LED signal lamp equipped with the viewing angle limiting function to which the present invention is applied in FIG.

  The LED signal lamp 1 shown here includes a lamp case 3 in which the LED unit 2 is housed, and a transparent cover 4 attached to the opening end of the lamp case 3.

  The LED unit 2 has a large number of LED lamps 6, 6,... Mounted on a printed wiring board (glass epoxy board) 5, and corresponds to each LED lamp 6 and through-holes through which each LED lamp 6 is inserted. 7 and 7, and a light emission limiting plate 10 in which a through hole 9 is formed at a front position corresponding to each LED lamp 6.

  As shown in FIG. 4, the LED lamp 6 includes a reflection dish 12 provided at the tip of the lead frame 11 and an LED chip 13 die-bonded to the bottom surface of the reflection dish 12. The electrode on the opposite side of the LED chip 13 is connected to the tip of the other lead frame 14 via the conductive wire 15 to the tip of the conductive wire 15, and the LED chip 13, the reflector 12, and the conductive wire. 15 and the leading end of the lead frame 11 are molded with an epoxy resin 16.

  The front surface of the antireflection plate 8 is formed in a black matte shape, and an insertion hole 7 through which the LED lamp 6 can be inserted is opened at a position corresponding to each LED lamp 6. Further, a flange portion 17 is projected along the upper opening edge of each insertion hole 7. Such an antireflection plate 8 is formed by integral molding using a synthetic resin material such as reinforced plastic. Then, an antireflection plate 8 is provided at the rear position of the reflection dish 12 of each LED lamp 6. Therefore, the upper surface of each LED lamp 6 protruding from the antireflection plate 8 is covered by the flange portion 17, so that sunlight such as the western sun can be blocked from entering the LED lamp 6.

  Next, the light emission limiting plate 10 is mounted in a state where the through hole 9 is formed at the front position of each LED lamp 6. The through-hole 9 is opened in a convex shape with the upper part opened to approximately the same diameter as the width of the LED lamp 6 and the lower part extending to the left and right sides.

  Further, as shown in FIGS. 5A and 5B, the through-hole 9 has a configuration in which a lower portion is opened in a triangular shape or a trapezoidal shape that is expanded in the left-right direction.

  Further, the light emission limiting plate 10 is formed of a metal plate such as a steel plate, and a black matte coating is applied on both surfaces thereof, or both surfaces of a black synthetic resin plate such as a reinforced plastic are provided with an anti-reflection texture. Processing, flocking, or non-woven fabric is applied.

  According to the LED signal lamp 1 of the present invention, the light emission limiting plate 10 in which the through holes 9 are formed at the positions corresponding to the LED lamps 6 is provided in the front, so that the light emitted from the LED lamps 6 can be transmitted through the through holes 9. Light is distributed depending on the shape.

  6A, 6B, and 6C show the light distribution characteristics of the signal lamp when the through hole has a convex shape, a triangular shape, or a trapezoidal shape.

  Here, the front of the signal lamp is located at 0 degrees left and right and 0 degrees below in the figure. If the basic installation height of the signal lamp is 4.5 m or more and the line of sight of the driver of the passenger car is 1.2 m, the elevation angle to the signal lamp is 2 degrees. Therefore, when the intersection stop line position is 15 m, the elevation angle is 15 degrees.

  For example, when the through hole 9 of the light emission limiting plate 10 has a convex shape, the light emission from the LED lamp 6 is emitted only in the convex opening range as shown in FIG. Light distribution characteristics. Therefore, at the point of 100 m entering the intersection, the light emission restriction is performed at 10 degrees on the left and right, and at the intersection stop line position, the light emission range is expanded to 30 degrees on the left and right, and when the vehicle stops at the end of the road or in the intersection It is possible to see the signal light even when entering.

  Similarly, when the through hole 9 of the light emission limiting plate 10 is triangular or trapezoidal, the light distribution characteristics are triangular or trapezoidal as shown in FIGS. Become. Therefore, the right and left light emission range is limited to a minimum at a point of 100 m entering the intersection, and at the intersection stop line position, the light emission range is expanded to the maximum left and right, and the vehicle stops at the end of the road. Even when entering the intersection, the signal light can be visually recognized.

  Next, as shown in FIGS. 7 (a), (b), and (c), the through hole 9 of the light emission limiting plate 10 is to increase the diameter of only one of the left and right sides of the convex, triangular, and trapezoidal bases. Thus, the light distribution characteristics of the same shape are obtained, and the right and left light emission ranges are limited to the minimum at a point of 100 m entering the intersection. On the other hand, at the intersection stop line position, the light emission range is maximized to either the left or right, and it is possible to limit the viewing angle to either the left or right at the intersection stop line position.

  By the way, as shown in FIG. 3, the irradiation light from the LED lamp 6 is irradiated on the back surface of the light emission limiting plate 10 except that it is irradiated from the through hole 9 of the light emission limiting plate 10. The back surface of the plate 10 is absorbed without reflection by being black matt or anti-reflective textured, or by flocking or non-woven fabric. Further, even when the light emission limiting plate 10 is reflected on the back surface, the front surface is absorbed without being reflected by the antireflection plate 8 formed in a black matte shape, and the accuracy is improved. A high light emission range is ensured.

  In addition, when sunlight from the West or the like enters the LED lamp 6 or the through hole 9 of the light emission limiting plate 10, the incident light is blocked by the antireflection plate 8 and printed circuit board (glass epoxy board). ) Incoming light into 5 is blocked and the front surface thereof is absorbed without being reflected by the antireflection plate 8 formed in a black matte shape. Although the back surface is irradiated, the back surface of the light emission restricting plate 10 is absorbed without reflection by applying a black matte shape, anti-reflective texture, or flocking, non-woven fabric, and simulated lighting Is to prevent.

It is front explanatory drawing which shows an example of the LED unit for signal lamps provided with the viewing angle restriction | limiting function to which this invention is applied. It is side surface explanatory drawing in FIG. It is a partial expanded sectional view in FIG. It is explanatory drawing which shows the internal mechanism of a LED lamp. It is explanatory drawing which shows the other Example of the through-hole of the light emission restriction | limiting board in the LED signal lamp device provided with the viewing angle restriction | limiting function to which this invention is applied. It is explanatory drawing which shows the light distribution characteristic according to the through-hole of the light emission restriction | limiting board in the LED signal lamp device provided with the viewing angle restriction | limiting function to which this invention is applied. It is explanatory drawing which shows the other modification of the through-hole of the light emission restriction | limiting board in the LED signal lamp provided with the viewing angle restriction | limiting function to which this invention is applied. It is side surface explanatory drawing which shows an example of the conventional LED signal lamp device. It is explanatory drawing which shows an example of the LED signal lamp provided with the conventional viewing angle restriction | limiting mechanism. It is explanatory drawing which shows an example of the LED signal lamp provided with the conventional western sun countermeasure mechanism. It is explanatory drawing which shows an example of the light distribution characteristic of the LED signal lamp provided with the conventional viewing angle restriction | limiting mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED signal lamp 2 LED unit 3 Lamp case 4 Cover 5 Printed wiring board 6 LED lamp 7 Insertion hole 8 Antireflection board 9 Through hole 10 Light emission restricting plate 11, 14 Lead frame 12 Reflection tray 13 LED chip 15 Conductive wire 16 Epoxy resin 17 Buttocks

Claims (6)

In the LED unit used for signal lamps,
A plurality of LED lamps mounted on a printed wiring board;
An antireflection plate disposed in a state of being inserted through each of the LED lamps;
A light emission control plate in which a through hole is formed from the front to the lower side corresponding to each LED lamp is disposed, and at the position where the through hole corresponds to each LED lamp, the width diameter of the through hole is approximately An LED unit for a signal lamp device having a viewing angle limiting function, characterized by having the same diameter and having a shape that opens downward from the same diameter, or a lower lower end that opens in an enlarged shape. The LED unit for signal lamps having a viewing angle limiting function according to claim 1, wherein the through hole has a convex shape. The LED unit for signal lamps having a viewing angle limiting function according to claim 1, wherein the through hole has a triangular shape. The said through hole is trapezoid shape. The LED unit for signal lamps provided with the viewing angle restriction | limiting function of Claim 1 characterized by the above-mentioned. 5. The LED unit for signal lamps having a viewing angle limiting function according to claim 1, wherein the front surface of the antireflection plate is formed in a black matte shape. The LED unit for a signal lamp device having a viewing angle limiting function according to claim 1, wherein both sides of the light emission control plate are formed in a black matte shape.

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