JP2004124365A - Buried marker lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a buried marker lamp capable of suppressing the lowering of light emission efficiency by radiating the heat of a light emitting diode into the ground. <P>SOLUTION: This buried marker lamp is provided with a metal base 1 having a bottomed cylindrical shape buried in a roadbed G with an upper part opened, a metal marker lamp body 2 arranged directly or indirectly in an opening of the base and provided with a light projection window 2b communicating with an internal space, and a plurality of light emitting diodes 3 by arranging them in order. It is provided with a light emitting diode unit LU arranged in the internal space of the marker lamp body so that emitted light from a lens 3a of the light emitting diode penetrates a light projection window and a fixing member S in which metal filled between the roadbed and the base and having thermal conductivity is mixed and blended. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recessed sign light used for an airport runway or a road surface.
[0002]
2. Description of the Related Art Currently, incandescent lamps used in airports and the like use incandescent lamps such as halogen lamps as light sources, but it is considered to use light emitting diodes instead of light sources such as halogen lamps (hereinafter referred to as "light emitting diodes"). , Patent Documents 1 and 2). When the light source is changed to a light emitting diode in this manner, energy is saved and the life is significantly extended, so that not only is the environment friendly, but also the maintenance cost can be greatly reduced.
[0003]
In addition, generally, a base made of metal such as an aluminum casting on which the marker lamp body is mounted has a resin adhesive or the like around the base as described in Non-Patent Document 1 below. And is fixed to the roadbed by the material having relatively low thermal conductivity.
[0004]
[Patent Document 1]
Japanese Unexamined Patent Publication No. Hei 11-514136
[Patent Document 1]
JP 2002-50203 A
[Non-patent document 1]
"Common Specifications for Aviation Lighting and Electrical Facilities Construction" (1999, supervised by the Civil Aviation Bureau of the Ministry of Transport, pages 21 to 41, edited and published by the Institute of Electrical Engineers of Japan)
Since the light emitting diode has a property that the light emission output decreases when the temperature of the element rises, the light source of this type of embedded marker light which is arranged in a closed space is used. When a light emitting diode is used as a light emitting diode, the temperature of the light emitting diode tends to increase, and the luminous efficiency deteriorates.
[0007]
As described above, the base on which the marker lamp body is mounted is made of metal, such as an aluminum casting, and similarly, the marker lamp body is also made of metal. It was thought that heat was transferred to the ground through the base, but when the base was buried in the roadbed, the surrounding area was filled with a relatively low heat conductive material such as resin-based adhesive, so it was effective. Was not dissipated.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to provide an embedded marker lamp capable of suppressing a decrease in luminous efficiency by radiating heat of a light emitting diode to the ground.
[0009]
SUMMARY OF THE INVENTION A recessed-type marker lamp of the present invention includes a bottomed cylindrical metal base buried in a roadbed and having an open top, and a direct or indirect connection to an opening of the base. A metal marker light body with a light-emitting window communicating with the internal space and a plurality of light-emitting diodes arranged side by side, and the light emitted from the lens of the light-emitting diode passes through the light-emitting window. A light emitting diode unit disposed in the interior space of the marker light main body, and a fixing material in which a thermally conductive metal filled between the roadbed and the base is kneaded. I do.
[0010]
In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.
[0011]
<Regarding the Sign Light> The sign light may be used for various purposes such as for airports and roads. However, the marker lights of the present invention have a common feature that a light emitting diode is used as a light source in any form and use. In addition, in the case of a recessed aeronautical traffic light, which is a traffic light for airports, the present invention can be applied to, for example, a runway centerline light and a taxiway centerline light.
[0012]
<About the marker light main body> The “marker lamp main body” refers to the remaining portion of the marker light excluding the light emitting diode unit. The marker lamp body is mainly made of a metal such as aluminum, for example, and has at least a light projecting window communicating with the internal space. The internal space must be at least as large as necessary to mount a light emitting diode unit described below and connect a power supply. The light projecting window communicates with the internal space and combines the light emitted from the plurality of light emitting diodes to contribute to projecting outward from the marker light with predetermined light distribution characteristics as the marker light.
[0013]
In addition, the light emitting window optically processes the light from the light emitting diode as necessary in order to combine the light emission of the light emitting diode and project it outward from the marker light with a predetermined light distribution characteristic as a marker light. It is acceptable to do so. For example, it is possible to configure so that light projected from a light emitting diode at a certain elevation angle is refracted and projected to a smaller elevation angle to the outside. In this case, a prism can be attached to the light projecting window. In addition, a lens can be attached to the light emitting window to further widen the light distribution characteristics of the light projected from the light emitting diode in the lateral direction. Further, the functions of the prism and the lens may be used in combination. However, when the optical processing is not performed, the internal space of the marker lamp can be sealed from the outside in a liquid-tight manner simply by attaching a transparent body such as a transparent glass to the light projecting window. When a prism, a lens, and the like are mounted on the light projecting window, the interior space of the marker lamp can be sealed from the outside in a liquid-tight manner when these are mounted. In addition, a plurality of, for example, two light emitting windows can be arranged so as to face each other with a staggered or an appropriate angle, if necessary.
[0014]
In addition, in addition to the above configuration, the marker light main body can include a power supply introduction unit for introducing power from the outside, a mounting unit for installing the marker lamp, and the like. Further, in the case where the marker light is a recessed marker light for an airport, the marker light main body can be mainly composed of a base and a lamp body. The base has a cylindrical box shape with an open upper end, is buried in a state where the open end is exposed on the road surface, and is connected to a wiring cable buried underground. Further, the opening end is provided with a bearing peripheral step for supporting the peripheral edge of the lamp body. The lamp body has a substantially disk shape with a gently protruding bulge on the upper surface, and the light projecting window and the light projected from the light projecting window are directed to the bulge on the upper surface without hindrance. Are formed. The lamp body is detachably attached to the opening end with its peripheral edge supported by the supporting step of the base.
[0015]
<Regarding Light Emitting Diode Unit> The light emitting diode unit includes a plurality of light emitting diodes arranged side by side, and is disposed in the internal space of the marker lamp main body so that light emitted from the lens portion of the light emitting diodes passes through the light projecting window. Not only is the tip of the lens unit facing the light emitting window with the axis of the light emitting diode perpendicular to the inner end face of the light emitting window, but also the axis of the light emitting diode is This includes a state in which the lens unit faces the light projecting window at a proper angle with respect to the inner end surface.
[0016]
Further, the light emitting diode units are arranged in the internal space of the appropriate number of marker lights so as to correspond one-to-one with the light emitting windows of the marker light body.
[0017]
(Regarding Light-Emitting Diodes) Each light-emitting diode includes at least a light-emitting diode chip and a lens portion made of a light-transmitting synthetic resin. The lens portion has a light emitting diode chip embedded therein, and the outer diameter of the light emitting diode as viewed from the axial direction has a horizontally long shape, for example, a horizontally long elliptical shape, a horizontally long oval shape, and the like, and an axial light distribution. The characteristic is, for example, a horizontally long shape. Further, the luminous intensity and the luminescent color of the light emitting diode are not particularly limited. However, in order to obtain a required luminous intensity as a marker lamp with a minimum number of light emitting diodes, it is desirable that the luminous intensity per one light emitting diode is 10 cd or more.
[0018]
With regard to the emission color, if a light emitting diode that emits light of the color required by the sign lamp, for example, blue-green light is used, only a blue-green light is transmitted, and a color filter for blocking other color light is not used. As a result, the reduction in luminous intensity due to the color filter can be eliminated, and the efficiency of the device can be increased accordingly. Note that it is convenient for mounting if the number of light emitting diodes is 40 or less. In the case of airport recessed sign lights, especially taxiway centerline lights, the light-emitting diodes used must meet the predetermined light distribution characteristics spread horizontally, that is, to a predetermined angle in the horizontal direction. It is preferable to have
[0019]
Next, in order to light a plurality of light emitting diodes, a direct current may flow in the forward direction of the light emitting diodes. However, the lighting power supply may be either a DC power supply or an AC power supply. That is, since the luminous intensity of a single-chip light-emitting diode is overwhelmingly often significantly smaller than the required luminous intensity of a marker light, a plurality of light-emitting diodes are used. For example, a plurality of light emitting diodes to be used are divided into an even number of blocks, connected in series in each block, and then each block is divided into two and connected in antiparallel to each other. Thus, half of the light emitting diodes are in a forward direction with respect to one polarity of the AC voltage, and the remaining half of the light emitting diodes are in a forward direction with respect to the other polarity of the AC voltage.
[0020]
Further, a plurality of light emitting diode pairs in which a pair of light emitting diodes are connected in anti-parallel can be connected in series and connected to an AC power supply. Of course, when the light emitting diode is turned on using a DC power supply, the light emitting diode is connected to a polarity such that a direct current flows in the forward direction.
[0021]
(Other configurations of light emitting diodes)
[0022]
1. An alignment plate having a plurality of insertion holes for supporting the lens portion of the light emitting diode through the alignment plate can be provided as a part of the light emitting diode unit. Then, if the alignment plate is fixed, the light emitting diode unit can be fixed in a predetermined direction with respect to the marker lamp body, and the predetermined light distribution characteristic can be maintained even with respect to vibration and impact. . In addition, when the light-emitting diodes are arranged at a predetermined angle, the insertion plate is formed with the insertion holes inclined at a predetermined angle, so that the inclination of the light-emitting diodes can be accurately and not carelessly changed. Is very effective. In addition, when the alignment plate is made of a heat conductive metal such as aluminum, heat radiation of the light emitting diode is improved.
[0023]
2. A wiring board can be used to connect a plurality of light emitting diodes to the wiring board as needed.
[0024]
3. With the fixture of the light emitting diode unit, the alignment plate and the wiring board can be separated from each other substantially in parallel at a predetermined interval, and both can be integrated with the fixture. Further, the light emitting diode unit may be attached to the internal space of the marker light by using a part of the fixing tool.
[0025]
Embodiments of the present invention will be described below with reference to the drawings.
[0026]
FIG. 1 is a sectional view showing an airport aviation traffic light as a first embodiment of the traffic light according to the present invention. FIG. 2 is a plan view of the main body of the traffic light.
[0027]
The base 1 made of an aluminum casting has a shallow bottomed cylindrical shape whose upper end is open, and is buried in the road surface with its open end exposed from the road surface. A suitable number of wiring holes (not shown) are formed on the side surface of the base, and cables are drawn through the waterproof bush attached to the wiring holes. At the open end of the base 1, an inwardly directed annular bearing seat 1a is formed at a position one step lower.
[0028]
Further, a space between the periphery of the base 1 and the roadbed G is filled with a fixing material S obtained by kneading a metal filler having high thermal conductivity such as copper or aluminum into an epoxy resin or a rubber-based adhesive, for example. G is firmly fixed.
[0029]
The lamp body 2 mainly includes a lamp body container 2a made of aluminum, a light projecting window 2b, and a terminal block (not shown). The lamp body 2a is configured by covering the upper lamp body 2a1 and the lower lamp body 2a2. The upper lamp body 2a1 has a bulging portion 2a11 and a light guiding groove 2a12 on the upper surface. The bulging portion 2a11 is formed on the upper surface of the upper lamp body 2a1 in the form of a truncated cone having a circular flat top surface and a conical slope extending from the top surface to the periphery of the upper lamp body 2a.
[0030]
A pair of the light guiding grooves 2a12 are alternately arranged at point-symmetric positions about the center of the lamp housing 2a in FIG. The light-guiding groove 2a12 opens on the slope of the truncated cone of the bulging portion 2a12, and communicates with the interior of the lamp body 2a. A light-projecting window 2b is formed in the communicating portion. Note that a desired number of the light guide grooves 2a12 can be provided. Further, as shown in FIG. 2, a plurality of bolt insertion holes 2a13 for connecting the upper lamp body 2a1 and the lower lamp body 2a2 to form the lamp body 2a are provided on the periphery of the lamp body 2a. A plurality of bolt insertion holes 2a14 for fixing the 2a to the base 1 are formed. The lower lamp 2a2 has a dish shape, is covered by the upper lamp 2a1 with a stud bolt (not shown), and forms an internal space 2a3 in cooperation with the upper lamp 2a1.
[0031]
Although not shown, a terminal block for connecting to the base 1 to obtain power is provided. In the light projecting window 2b, the prism 2b1 is inserted into the light guide groove 2a12 of the lamp body 2a from the side of the internal space 2a3. Liquid-tight.
[0032]
The light emitting diode unit LU includes a light emitting diode 3, an alignment plate 4, a wiring board 5, and a circuit component 6, as shown in FIG. As shown in FIG. 4, the light emitting diode 3 includes a lens portion 3a, a light emitting diode chip (not shown), a stem portion 3b, and a lead wire 3c. The lens portion 3a is formed by molding a transparent synthetic resin, has a horizontally long elliptical shape, and has a minor axis: major axis ratio set to 3.5: 10.
[0033]
The light emitting diode chip is embedded in the lens unit 3a. The stem portion 3b supports the base end of the lens portion 3a, and a pair of lead wires 3c extends from the lower surface thereof. The alignment plate 4 is made of aluminum, has a horizontally long rectangular shape as a whole, and has a plurality of insertion holes 4a aligned. The insertion hole 4a has an elliptical shape for inserting the head of the light emitting diode 3, that is, the lens portion 3a. The wiring board 5 is disposed behind the plurality of light emitting diodes 3, and has lead wires 3 c of the light emitting diodes 3 mounted thereon and wired as required.
[0034]
The circuit component 6 includes a resistor or the like that adjusts a current flowing through the light emitting diode 3 and is mounted on the surface of the wiring board 5 opposite to the surface on which the light emitting diode 3 is mounted.
[0035]
FIG. 4 is a sectional view showing another embodiment of the marker lamp of the present invention.
[0036]
The base 1 has a cylindrical shape with a bottom and an open upper end, and is buried in the road surface with the open end exposed from the road surface. An appropriate number of wiring lead-in holes 1b are formed on the side surface of the base 1, and the serially connected trunk cable Wm is drawn in through the waterproof bush 1c mounted in the wiring lead-in hole 1b. The branch cable Wb is led out of the base 1 through a similar structure (not shown).
[0037]
Further, a space between the periphery of the base 1 and the roadbed G is filled with a fixing material S obtained by kneading a metal filler having high thermal conductivity such as copper or aluminum into an epoxy resin or a rubber-based adhesive, for example. G is firmly fixed.
[0038]
At the open end of the base 1, an inward annular seat 1a is formed at a position one step lower. The lower lamp 2a2 has a dish shape, is covered by the upper lamp 2a1 with a stud bolt (not shown), and forms an internal space 2a3 in cooperation with the upper lamp 2a1. Further, a terminal block 2c is provided at the center. The terminal block 2c includes an insulating bush 2c1 and a terminal 2c2, and penetrates through the lower lamp body 2a2 and is disposed on the lower surface of the lamp body container c2a. The insulating bush 2c1 is mounted so as to penetrate the lower lamp body 2a2, and the terminal 2c2 penetrates the insulating bush 2c1 while being insulated from the lower lamp body 2a2. It is connected to the light emitting diode 3 via a wiring board 5 inside.
[0039]
An electric circuit LDC is provided on the inner bottom of the base 1. The electric circuit LDC includes an insulating transformer and the like, is mounted on the wiring board PB, and is housed in the waterproof case WTC.
[0040]
The waterproof case WTC has a split structure, and its joint surface is waterproofed by an O-ring OR. Further, a pair of wiring insertion holes H1 and H2 are formed in the waterproof case WTC, and the series connection trunk cable Wm is drawn in through the waterproof bush WTB, and the connection line CC to the branch cable Wb is led out. . The branch cable Wb is connected to the connection line CC inside the base 1 via the waterproof connector WCN. The alignment plate 4 is formed such that a plurality of insertion holes 4a arranged in the lateral direction have a constant angle difference, for example, 2.5 °, inwardly between adjacent ones. As a result, the plurality of light emitting diodes 3 are successively inclined inward and are inserted into the insertion holes 4a and supported.
[0041]
According to the present invention, since the heat-conductive metal is kneaded in the fixing material filled between the periphery of the base and the roadbed, the light-emitting material provided in the marker lamp body is used. The heat of the diode is easily dissipated into the ground through the marker lamp main body and the base, and as a result, it is possible to provide an embedded marker lamp that can suppress a decrease in the luminous efficiency of the light emitting diode.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an airport signpost lamp as an embodiment of the recessed signpost lamp of the present invention.
FIG. 2 is a plan view showing a marker lamp main body of the recessed marker lamp of the present invention shown in FIG.
FIG. 3 is an enlarged front view and an enlarged side view showing the light emitting diode unit.
FIG. 4 is a sectional view showing another embodiment of the marker lamp of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Base 1a ... Annular bearing seat 2 ... Lamp body 2a ... Lamp body 2a1 ... Upper lamp body 2a11 ... Swelling part 2a12 ... Light guide groove 2a13 ... Bolt insertion hole 2a14: Bolt insertion hole 2a2: Lower lamp 2a3: Internal space 2b: Projection window 2b1: Prism 2b2: Packing 2b3: Holding bracket LU: Light emitting diode unit DESCRIPTION OF SYMBOLS 3 ... Light emitting diode 3a ... Lens part 3b ... Stem part 3c ... Lead wire 4 ... Alignment plate 4a ... Insertion hole 5 ... Wiring board 7 ... Fixing tool G ..Road bed S ・ ・ ・ Adhesive material

Claims (1)

A bottomed cylindrical metal base buried in the roadbed and having an open top;
A metal marker light body provided directly or indirectly at the opening of the base and having a light emitting window communicating with the internal space;
A plurality of light emitting diodes arranged side by side, and a light emitting diode unit disposed in the internal space of the marker light body such that light emitted from the lens portion of the light emitting diodes passes through the light emitting window;
A heat conductive metal-kneaded fixing material filled between the roadbed and the base;
A recessed-type sign light characterized by comprising:

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