JP2012059620A - Underground-laying type lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underground-laying type lighting fixture capable of preventing a translucent lid for covering an opening at an upper end of a lighting fixture body from becoming high temperature and preventing heat from being stayed in the lighting fixture body.SOLUTION: In the underground-laying type lighting fixture, an opening 12 is arranged on an upper end of the lighting fixture body 10, the lighting fixture body 10 having a container shape formed so as to store a lamp 20 or the like and made of aluminum or aluminum alloy is partitioned with a partition wall 151 vertically, a lamp chamber 30 for storing the lamp 20 is formed at the down side of the lighting fixture body 10, and the lighting fixture body 10 is further divided by preparing a first transparent plate 50 between the partition wall 151 and the translucent lid 40. Then, an infrared absorption property is given to a reflecting surface of a reflector 23 of the lamp 20 and a translucent filter for covering the front of the reflector 23 in order to remove infrared rays, the light where the infrared rays are removed is irradiated to the lid 40, and conduction of heat of the reflector 23 and the translucent filter 24 to the lid 40 can be prevented by air layers 31, 32.

Description

  More specifically, the present invention relates to an underground illuminating device, and more specifically, the main body is embedded in the ground in a state where a component device such as a lamp is accommodated inside a main body formed in a container shape, and an upper end opening of the main body is formed. The present invention relates to an underground illuminating device that illuminates by irradiating upward light outside a main body through a light-transmitting lid.

  Underground lighting fixtures that are buried and used in the ground are buried in the ground of parks, promenades, gardens, etc., and are used as lighting fixtures to illuminate plants, objects, other structures, signboards, etc. Has been.

  In this way, in underground luminaires that are buried and used outdoors in the ground, components such as lamps and ballasts are protected from dirt, dust, other debris, rain and snow, etc. In order to do this, a main body formed in a container shape that can accommodate these inside is provided through an opening provided in the upper end, and the main body is embedded in the ground, and the inside is provided through the opening provided in the main body. After housing a device such as a lamp, this opening is covered with a light-transmitting lid such as a cover glass so that the irradiation light can be irradiated upward through the top opening and the lid covering the opening. .

  In such underground lighting fixtures, the above-mentioned translucent lid that covers the upper end opening of the above-mentioned main body is formed of tempered glass or the like, and pedestrians or the like are placed on the translucent lid. Even when riding on the road surface, it is strong enough to support it, and the surface of this translucent lid is embedded in the ground so that it is almost flush with the road surface. In order to prevent pedestrians from being hindered by the installation of underground luminaires, there is no step between them and underground luminaires.

  In the underground luminaire constructed as described above, a so-called “HID lamp (High Intensity Discharge Lamp)” such as a high-pressure sodium lamp, a metal halide lamp (such as a multi-halogen lamp), or a mercury lamp is used as a light source lamp. Although a luminance discharge lamp is used, the light emitted from this type of lamp contains heat rays (infrared rays), so the above-described translucent cover that covers the opening provided at the top of the body of the underground luminaire is used. The lid is heated by the heat rays (infrared rays) and becomes high temperature. For this reason, there is no problem with touching the translucent lid through shoes or the like, but there is a risk of burns if the lid is touched by mistake.

  As described above, there is a prior art that proposes a wide distance between the light source lamp and the translucent lid in order to prevent the translucent lid from becoming high temperature. 6A, the general configuration of the underground lighting fixture 200 in which the long axis of the light source lamp 220 is arranged in the vertical direction is different from that of the light source lamp 220 as shown in FIG. It is also proposed to suppress the temperature rise of the lid 240 by increasing the distance between the light source lamp 220 and the lid 240 without increasing the overall height of the luminaire body 210 by arranging the long axis in the horizontal direction. (Patent Document 1 “0012” column).

Utility Model Registration No. 3145206

  Here, in the heating by infrared rays, infrared rays (infrared rays are electromagnetic waves having a specific wavelength) emitted from the light source and irradiated on the object are absorbed into the object by resonance, and the absorbed energy is reflected in the molecules of the object. Because it is a phenomenon caused by heat generated by vibrating (atoms), heating by infrared rays is not a transfer of “heat” via a heat medium such as air, as in the case of heating by hot air, but “light energy” Can be regarded as a fever.

  Considering the action of changing the direction of the axial direction of the light source lamp 220 as described in Patent Document 1 described above in consideration of infrared rays and light as energy, it is described in Patent Document 1. It can be seen that even if this configuration is adopted, the temperature rise of the translucent cover plate 240 due to infrared radiation can hardly be suppressed.

  That is, when the axial direction of the light source lamp 220 is changed from the vertical direction as shown in FIG. 6A to the horizontal direction as shown in FIG. The distance between the outer tube bulb 220 and the light-transmitting lid 240 certainly extends from 1 in FIG. 6 (A) to L in FIG. 6 (B), but the arrangement of the light emitting points is the reflector. Therefore, if the direction other than the direction of the light source lamp 220 is left as it is, the distance D between the light emitting point of the light source lamp 220 generating the infrared rays and the lid 240 is arranged in any direction. Even if it does not change.

  Therefore, even if the direction of the axial direction of the light source lamp 220 is changed according to the description in Patent Document 1, there is no effect of reducing the energy of infrared rays radiated to the translucent lid 240. In the configuration described in No. 1, heat generation of the lid 240 due to infrared resonance absorption cannot be prevented.

  In this case, Patent Document 1 does not have an idea of preventing the cover 240 from generating heat due to infrared radiation, and the light source lamp 220 itself is regarded as a heat generating element. It can be seen that by disposing as far as possible, the light-transmitting lid 240 is prevented from being heated by “heat conduction” using air or the like as a medium.

  Certainly, the light source lamp 220 generates heat when it is lit, but the above-mentioned HID lamp used in this type of lighting fixture has less energy because it is more energy efficient than halogen lamps, etc. The temperature of the outer bulb is very high because the arc tube is housed in a high vacuum outer bulb and quartz glass with low infrared absorption is used as the outer bulb. Don't be.

  Therefore, as described in Patent Document 1, the distance between the outer tube bulb of the light source lamp 220 and the translucent lid 240 can be increased by about several centimeters with the axial direction of the light source lamp as the horizontal direction. However, it is not considered that the effect of greatly reducing the temperature of the translucent lid 240 is obtained by this.

  As described above, in the method introduced in Patent Document 1, the temperature of the lid 240 is increased by infrared rays as light energy, and the temperature of the lid 240 is also increased by heat conduction through air or the like. None of the rises can be suppressed.

  Therefore, the present invention regards infrared rays (heat rays) radiated from the light source lamp as “light energy” and cuts the infrared rays before entering the light-transmitting lid, so that the light-transmitting lid is infrared. The device used to cut this infrared ray by effectively preventing the lid from generating heat by preventing resonance absorption and cutting the infrared ray before it is emitted to the translucent lid. In response to the new problem of heat generation, the heat generated in this way is prevented from entering the main body, thereby preventing damage to the light source lamps and ballasts housed in the main body. Furthermore, by preventing the heat generated by the equipment used to cut the heat rays from being transmitted to the translucent lid using air or the like as a medium, the translucent lid is heated by heat conduction. Earth with a structure that can prevent And to provide a buried type lighting fixture.

  Hereinafter, means for solving the problem will be described together with reference numerals used in the embodiment for carrying out the invention. This symbol is intended to clarify the correspondence between the description of the claims and the description of the mode for carrying out the invention. Needless to say, it is used for the interpretation of the technical scope of the claims of the present invention. It is not used restrictively.

In order to achieve the above object, the underground luminaire 1 of the present invention includes a main body 10 embedded in the ground, a lamp 20 accommodated in the main body 10, and an upper end opening 12 of the main body 10. In the underground luminaire 1 having a translucent lid 40 to be covered,
The main body 10 is made of aluminum or an aluminum alloy, and the main body 10 is divided into upper and lower parts by a partition wall 151 having an opening 152 at the center, and the lower chamber is a lamp chamber 30 that houses the lamp 20. And the space inside the main body between the translucent lid 40 and the partition wall 151 is further partitioned vertically by a first transparent plate 50,
A light source lamp 22, an upwardly opened reflector 23 that reflects light from the light source lamp 22 upward, and a front part of the opening of the reflector 23 are reflected on the lamp 20 accommodated in the lamp chamber 30. A light-transmitting filter 24 is provided to provide light absorption with a wavelength of 740 nm to 1150 nm to the reflecting surface of the reflector 23 and the light-transmitting filter 24, and light that has passed through the light-transmitting filter 24 is transmitted to the partition wall. The lamp 20 is accommodated in the lamp chamber 30 so that the light-transmitting lid 40 can be irradiated through the opening 152 provided in the lamp 151.
The opening 152 of the partition wall 151 is covered with a second transparent plate 60 (Claim 1).

  In addition to the structure of claim 1, a cone 25 is provided to extend upward the opening edge of the reflector 23, and the upper end of the cone 25 is locked in the opening 152 provided in the partition wall 151, thereby It is preferable that the lamp 20 is suspended in the lamp 30 and the lamp 20 is accommodated in the lamp chamber 30. (Claim 2)

  In the underground luminaire having the above-described configuration, the second transparent plate 60 covering the opening 152 of the partition wall 151 may be provided with light absorptivity having a wavelength of 740 nm to 1150 nm. 3).

  Further, it is preferable to provide heat radiating fins 17 on the outer periphery of the main body 10 (claim 4).

  In order to efficiently absorb the infrared rays of the light source lamp, it is preferable that the reflector and / or the filter is formed of a multi-layered film of an optical thin film having a function of branching incident light by transmission and reflection. (Claim 5).

  According to the configuration of the present invention described above, according to the underground luminaire 1 of the present invention, the following remarkable effects can be obtained.

  By providing the reflecting surface of the reflector 23 provided in the lamp 20 with a light absorptivity having a wavelength of 740 nm to 1150 nm, and covering the front of the reflector 23 with a translucent filter 24 having a light absorptivity with a wavelength of 740 nm to 1150 nm, Since the light from the light source lamp 22 is irradiated toward the translucent lid 40 with the infrared rays cut, it is possible to prevent the translucent lid 40 from generating heat due to absorption of infrared rays.

  On the other hand, since the reflector 23 and the translucent filter 24 are configured to absorb infrared rays as described above, the reflector 23 and the translucent filter 24 that absorbs infrared rays generate heat at a high temperature. The main body 10 is made of aluminum or aluminum alloy having good thermal conductivity, and the lamp 20 including the reflector 23 and the translucent filter 24 that generate heat is housed in the lamp chamber 30 provided in the main body 10. The heat generated by the reflector 23 and the translucent filter 24 is cooled by the convection of air generated in the lamp chamber 30, and is easily absorbed by the main body 10 and dissipated into the ground. Between the optical filter 24 and the translucent lid 40, an air layer 31 formed between the partition wall 151 and the first transparent plate 50, and the first transparent plate 50 and the translucent lid. It is possible to prevent the heat of the reflector 23 and the translucent filter 24 from being transmitted to the translucent lid 40 using air as a medium because the two air layers of the air layer 32 formed between 40 are interposed. did it.

  As a result, in the underground luminaire 1 having the above-described configuration, the temperature of the translucent lid 40 is relatively low, preferably 38 ° C. or less where the human body does not feel heat even when directly touching the human body. The light source lamp 22 provided in the lamp 20 and the ballast accommodated in the main body 10 together with the lamp 20 are preferably prevented from being damaged by the heat trapped in the main body 10. I was able to.

  When the second transparent plate 60 that covers the opening 152 provided in the partition wall 151 also has light absorptivity with a wavelength of 740 nm to 1150 nm, it is radiated to the translucent lid 40. Infrared rays contained in the light could be further reduced, and as a result, the temperature of the translucent lid 40 could be further reduced.

  In the configuration in which the heat radiating fins 17 are formed on the outer periphery of the main body 10, the heat conducted to the main body 10 by the heat radiating fins 17 can be easily conducted to the ground, and the main body 10 can be suitably cooled. In addition, the main body 10 could be firmly embedded by the heat radiation fins 17 biting into the ground.

The side view of the underground lighting fixture of this invention. The top view of the underground lighting fixture of this invention. III-III sectional view taken on the line of FIG. The enlarged view of the upper end opening part of a main body. The elements on larger scale of a translucent lid. It is explanatory drawing of a prior art, (A) is the structure which made the axial direction of the light source lamp vertical, (B) is the structure of patent document 1 which made the axial direction of the light source lamp horizontal.

  Next, the lighting fixture of this invention is demonstrated, referring an accompanying drawing.

  The luminaire 1 of the present invention covers a main body 10 used in a state where the upper end edge 11 is buried in the ground so that the upper end edge 11 is substantially flush with a road surface and the like, and an opening 12 formed at the upper end of the main body 10. A translucent lid 40 is provided so that the light emitted by the lamp 20 accommodated in the main body 10 can be radiated to the outside through the translucent lid 40 covering the opening 12. The above-mentioned main body 10 that is buried in the ground and accommodates the lamp 20 and its accessories (such as ballast) and the upper end opening 12 of the main body 10 are covered. The above-described translucent lid 40 is provided (FIGS. 1 to 3).

[Main unit]
The aforementioned main body 10 constituting the luminaire 1 of the present invention is used in a state where it is buried in the ground. As shown in FIG. 3, the lamp 20 and its associated equipment [for example, a ballast or the like (not shown) )] Is formed, and an opening 12 is formed at the upper end so that the above-described device such as the lamp 20 can be accommodated in the main body 10.

  In the present embodiment, the main body 10 is placed on a rectangular bottom plate 13 (see FIG. 2) on an octagonal rectangular tube portion 14 cut out at positions corresponding to the four corner portions of the bottom plate 13. , A substantially conical cone portion 15 provided on the rectangular tube portion 14 and a cylindrical portion 16 formed on the cone portion 15 (see FIGS. 1 to 3).

  By forming in this way, the main body 10 in the present embodiment has a shape in which the lower part is wider with respect to the upper end, and the lamp chamber 30 which is a space for accommodating the lamp 20 described later is widely formed. The lamp 20 that has generated heat due to the convection of the air in the lamp chamber 30 is efficiently cooled, and the attachment work of the lamp 20 and the like using a tool or the like in the main body 10 is easy to perform. Yes.

  However, the main body 10 used in the lighting fixture 1 of the present invention has the above-described corner as long as it has a shape in which a sufficient space for accommodating the lamp 20 and the like is formed and an opening 12 is formed at the upper end. The shape is not limited to the illustrated shape including the cylindrical portion 14, the conical portion 15, and the cylindrical portion 16, but may be formed in a simpler shape, for example, a bottomed cylindrical shape as a whole.

  The main body 10 of the luminaire 1 in this embodiment is made of aluminum or an aluminum alloy so that good thermal conductivity can be obtained. After the aluminum or aluminum alloy is molded into the above-described shape, the surface (necessary Accordingly, a surface treatment for imparting weather resistance to the inner surface) is performed.

  In this embodiment, as an example, the main body 10 of the luminaire 1 is manufactured by low-pressure casting of the above-described aluminum material due to ease of processing and good thermal conductivity. Metal zinc treatment, chemical conversion treatment, painting and baking are performed in order, and the first layer, which is the metal zinc layer, is firmly bonded by a chemical reaction, and the second layer, which is a highly corrosion-resistant chemical conversion coating layer, uses a ceramic material. The third layer, which is a surface fired layer, is given a weather resistance by performing a “Ruspert” (trademark) treatment in which the third layer is firmly bonded by a cross-linking effect, and also closes the nests and the like generated during low pressure casting. Increases airtightness.

  However, the processing for imparting weather resistance to the main body 10 may use other known processing materials and other processing methods.

  In this embodiment, the outer periphery of the main body 10 of the luminaire 1 formed in this way, in the present embodiment, a large number of heat dissipating fins 17 are formed on the outer periphery of the aforementioned conical portion 15, and the heat conducted to the main body is transferred to the ground (Concrete, etc.) It is easy to conduct, and the bite of concrete when buried in the ground is improved.

  In the illustrated embodiment, the outer periphery of the cylindrical portion 16 is provided with a number of ridges 17 ′ for improving the biting of the concrete when embedded in the ground. Instead of ', a heat radiating fin may be provided on the outer periphery of the cylindrical portion 16 as well as the outer peripheral portion of the conical portion 15.

  In addition, the code | symbol 18 in FIG. 3 is an inlet, The wiring with respect to the inside of the main body 10 of the lighting fixture 1 is introduce | transduced through this inlet 18. FIG. A waterproof socket (not shown) is attached to the lead-in inlet 18 and the lead-in wire (not shown) is inserted into the waterproof socket to introduce the lead-in wire into the luminaire main body 10. ing.

  On the inner periphery of the opening 12 formed at the upper end of the main body 10 of the luminaire 1, as shown in FIG. 4, there is formed an inclined step portion 161 that is located near the upper end and is inclined downward. Below the portion 161, a flange 162 protruding in the inner peripheral direction and having a bottomed hole 168 formed on the upper surface and screwed with a bolt is formed at predetermined intervals. It is comprised so that the translucent cover body 40 fitted via can be latched.

  The thickness of the flange 162 is reduced at the inner peripheral edge portion, and a locking step portion 164 is further formed on the upper surface of the flange 162 on the inner peripheral edge side. The periphery of one transparent plate 50 can be placed.

  Further, as shown in FIG. 3, in the main body 10, in the illustrated embodiment, there is a partition wall 151 that vertically divides the space in the main body 10 at a substantially intermediate position in the height direction of the conical portion 15 described above. The lower wall of the partition wall 151 serves as a lamp chamber 30 for accommodating a lamp 20, which will be described later, and is formed at the center of the partition wall 151. Is formed with a circular opening 152 concentric with the upper end opening 12 of the main body 10, and the light from the lamp 20 accommodated in the lamp chamber 30 is irradiated to the outside of the main body 10 from the upper end opening 12 through the opening 152. It can be done.

[Lamp]
The lamp 20 is housed in the lamp chamber 30 of the main body 10 configured as described above, and the main body is disposed through the opening 12 and the translucent lid 40 that closes the opening. Illumination can be performed by irradiating the outside 10.

  In the illustrated example, the lamp 20 includes a socket 21 connected to a power cord introduced into the main body through the introduction port 18 described above, a light source lamp 22 such as an HID lamp attached to the socket 21, and the light source. A bowl-shaped reflector 23 that reflects light generated by the lamp 22 upward, a translucent filter 24 that covers the front surface of the reflector 23, and a substantially cylindrical shape that extends upward at the upper end opening of the reflector 23. And a frame 26 which accommodates each of these components inside and arranges and fixes them at predetermined positions.

  In the present embodiment, the above-described translucent filter 24 covering the front of the reflector 23 is attached in the vicinity of the lower end portion of the cone 25, and the upper end edge of the cone 25 faces outward. When the lamp 20 is inserted into the opening 152 provided in the center of the partition wall 151 with the protruding flange 25a facing downward, the flange 25a provided on the outer periphery of the upper end of the cone 25 is connected to the partition wall 151. The lamp 20 can be accommodated in a state suspended in the lamp chamber 30 by being locked to the edge of the opening 152 provided in the lamp.

  Accordingly, in various types of lamps, if the upper end surface of the cone is configured to be the same, all types of lamps can be suspended and accommodated, and replacement thereof is easy.

  The above-described reflector 23 provided in the lamp 20 reflects light from the light source lamp 22 by, for example, forming a film of a light-absorbing material having a wavelength of 740 nm to 1150 nm on a reflecting surface formed as a mirror surface or the like. When the light is reflected by the reflector 23, the reflector 23 absorbs light having a wavelength of 740 nm to 1150 nm in the infrared wavelength region and reflects light of other wavelengths, thereby reflecting the light on the reflecting surface of the reflector 23 and transmitting the light. The heat rays (infrared rays) in the reflected light irradiated toward the lid 40 can be removed or reduced.

  In the present embodiment, the reflector has a structure in which a multi-layered film of an optical thin film is formed on a high-purity aluminum material by vacuum deposition to absorb the wavelength light.

  In the illustrated embodiment, by covering the tip of the light source lamp 22 with the cap 27, direct light from the light source lamp 22 is prevented from being irradiated toward the translucent lid 40 side. , The light directed toward the translucent lid 40 is all reflected by the reflector 23, and the infrared component can be reliably removed or reduced from the light incident on the translucent lid 40. I can do it.

  The translucent filter 24 covering the front of the reflector 23 absorbs light having a wavelength of 740 nm to 1150 nm and transmits light of other wavelengths, so that the light is reflected by the reflector 23. The infrared component still contained in the light that has been absorbed in this case is further absorbed by the translucent filter 24 and then irradiated to the translucent lid 40. Thus, the heat generation of the translucent lid 40 can be more reliably prevented.

  Therefore, the translucent filter is formed of a multi-layered dielectric film, which is formed by stacking optical thin films on the hard glass by vacuum deposition similar to the reflector, in the same manner as or instead of the reflector. It can be formed to absorb the wavelength light.

  After the lamp 20 is suspended from the edge of the opening 152 of the partition wall 151 and accommodated in the lamp chamber 30 as described above, the opening 152 provided in the center of the partition wall 151 is covered by the second transparent plate 60. The space in the main body 10 is completely partitioned at the upper and lower sides with the partition wall 151 as a boundary.

  As the second transparent plate 60, a normal transparent glass can be used as long as it has light transmissivity. However, the second transparent plate 60 is also similar to the reflector 23 and the translucent filter 24 described above. It is good also as what gives the light absorptivity of wavelength 740nm-1150nm, and further reducing the infrared component contained in the light irradiated toward the translucent cover body 40 by comprising in this way. It is possible to further suppress the heat generation of the translucent lid.

[Translucent lid and first transparent plate]
As described above, the first transparent plate 50 is inserted into the main body 10 containing the lamp 20 from the upper end opening 12 and placed on the locking step 164 provided on the flange 162. After the peripheral edge portion is placed, a translucent lid 40 is further fitted into the upper end opening 12 to cover the main body 10.

  The translucent lid 40 covering the upper end opening 12 formed in the main body 10 in this way has an endless annular metal on the peripheral edge of a transparent plate such as a glass plate 41 as shown in FIGS. A frame 42 made of steel is attached, and the frame 42 has the same interval as the formation interval of the bottomed holes 168 provided in the upper surface of the flange 162 provided in the opening 12 of the main body 10. Bolt holes 421 are formed in the frame body 42. The frame 42 is placed on a flange 162 provided in the opening 12, and is bolted to a bottomed hole 168 provided in the flange 162. The opening 12 can be covered in a sealed state.

  In the illustrated embodiment, a honeycomb louver 70 in which a large number of hexagonal columnar holes are formed in a honeycomb shape is disposed between the first transparent plate 50 and the translucent lid 40 described above. The honeycomb louver 70 suppresses the spread of irradiation light in the width direction and imparts antiglare properties (glareless).

[Action etc.]
When the light source lamp 22 provided in the lamp 20 is turned on in the state where the main body 10 of the underground lighting device 1 configured as described above is buried in the ground, the light irradiation starts when the light source lamp 22 is turned on. Is done.

  By covering the cap 27, the direct light from the light source lamp 22 is not irradiated upward, and only the reflected light reflected by the reflector 23 is used as illumination light.

  Therefore, by providing the reflecting surface of the reflector 23 with a light absorptivity having a wavelength of 740 nm to 1150 nm, when the light from the light source lamp is reflected by the reflector 23, the infrared component contained therein is absorbed. Thus, the light from which the infrared component has been removed is irradiated upward.

  The light reflected upward by the reflector is then further removed of the infrared component when passing through the translucent filter 24 covering the front surface of the reflector 23, and an opening 152 provided in the center of the partition wall 151 is formed. If the covering second transparent plate 60 is also given the property of absorbing light having a wavelength of 740 nm to 1150 nm, the infrared component is also removed when passing through the second transparent plate 60, Thus, the light from the light source lamp 22 from which the infrared rays have been substantially removed passes through the first transparent plate 50 and the honeycomb louver 70 and is incident on the translucent lid 40, and the translucent lid 40. And is irradiated outside the main body 10.

  Accordingly, the light from the light source lamp 22 is significantly removed from the infrared component contained therein before reaching the light-transmitting lid 40, so that even if the light from the light source lamp 22 is irradiated, The translucent lid 40 hardly generates heat.

  On the other hand, as described above, when the reflector 23 and the translucent filter 24, and in some cases, the second transparent plate 60 is provided with a property of absorbing infrared rays, the reflector 23 and the translucent filter 24, and in some cases, the first The second transparent plate 60 generates heat by absorbing infrared heat energy.

  However, the heat generated in the reflector 23, the translucent filter 24, and in some cases the second transparent plate 60 in this way is preferably conducted to the main body 10 made of aluminum or aluminum alloy having good thermal conductivity. The light source lamp 22 and the ballast (not shown) are not damaged by this heat because they are absorbed into the ground in contact with the outside of the main body 10.

  In addition, the heat of the reflector 23 and the translucent filter 24 and the second transparent plate 60 which are generated in this way are not only absorbed by the ground via the main body 10 but also as described above. The lamp 20 including the reflector 23 and the translucent filter 24 is housed in the lamp chamber 30 isolated by the partition wall 151, so that the lamp 20 is cooled by convection of air in the lamp chamber 30. At the same time, heat release to the ground through the main body 10 is promoted through the air, and the first transparent plate 50 and the partition wall 151 are provided between the lamp 20 and the translucent lid 40. The air layer 31 formed between the two transparent layers 40 and the air layer 32 formed between the translucent lid 40 and the first transparent plate 50 intervene, so that the reflector 23 and Translucent filter 24, second transparent plate 0 of heat, is prevented from being transmitted against transparent lid 40.

  As a result, it is possible to achieve both prevention of the temperature rise of the translucent lid 40 and prevention of the light source lamp 22 and the ballast from being damaged by heat.

Table 1 below shows the test results of the examples regarding the cut amount of infrared rays.
〔contents of the test〕
(1) Light source A halogen lamp (90 W: manufactured by OSRAM: J12V90W) having a large infrared region component of 700 nm or more was measured.
(2) Measurement method Under the following conditions of the reflector and filter, the filter and measurement surface were parallel, and the temperature at the center of the filter, and therefore at the center of the lamp, was measured 50 cm from the filter.

DESCRIPTION OF SYMBOLS 1 (Embedded type) Lighting fixture 10 Main body 11 Upper end edge 12 Opening 13 Bottom plate 14 Square tube part 15 Conical part 151 Partition wall 152 Opening 16 Cylindrical part 161 Inclined step part 162 Flange 164 Locking step part 168 Bottomed hole 17 Heat radiation Fin 17 'Projection 18 Inlet 20 Lamp 21 Socket 22 Light source lamp 23 Reflector 24 Translucent filter 25 Cone 25a Flange 26 Frame 27 Cap 30 Lamp chamber 31 Air layer (between first transparent plate 50 and partition wall 151)
32 Air layer (between the translucent lid 40 and the first transparent plate 50)
40 translucent lid 41 glass plate 42 frame 421 bolt hole 50 first transparent plate 60 second transparent plate 70 honeycomb louver 200 lighting fixture (underground type)
210 Main body 220 Light source lamp 240 Translucent lid

Claims (5)

In a underground luminaire comprising a main body embedded in the ground, a lamp housed in the main body, and a translucent lid that covers the upper end opening of the main body,
The main body is made of aluminum or an aluminum alloy, the inside of the main body is vertically divided by a partition wall having an opening in the center, and a lower chamber is formed as a lamp chamber for housing the lamp, and Partitioning the space in the main body between the upper lid and the partition wall up and down by a first transparent plate;
The lamp housed in the lamp chamber is provided with a light source lamp, an upwardly opened reflector that reflects light from the light source lamp upward, and a translucent filter that covers the front of the opening of the reflector. , Giving light absorption with a wavelength of 740 nm to 1150 nm to the reflecting surface of the reflector and the translucent filter, and passing the light transmitted through the translucent filter through the opening provided in the partition wall. The lamp is housed in the lamp chamber so that it can be irradiated toward the sex lid,
An underground lighting apparatus, wherein the opening of the partition wall is covered with a second transparent plate. In a underground luminaire comprising a main body embedded in the ground, a lamp housed in the main body, and a translucent lid that covers the upper end opening of the main body,
The main body is made of aluminum or an aluminum alloy, the inside of the main body is vertically divided by a partition wall having an opening in the center, and a lower chamber is formed as a lamp chamber for housing the lamp, and Partitioning the space in the main body between the upper lid and the partition wall up and down by a first transparent plate;
The lamp housed in the lamp chamber is provided with a light source lamp, an upwardly opened reflector that reflects light from the light source lamp upward, and a translucent filter that covers the front of the opening of the reflector. The reflecting surface of the reflector and the translucent filter are provided with a light absorptivity having a wavelength of 740 nm to 1150 nm, and a cone is provided to extend the opening edge of the reflector upward, and the upper end of the cone is provided on the partition wall. The lamp is suspended in the lamp chamber by hanging in the opening, and the light that has passed through the light-transmitting filter is applied to the light-transmitting lid through the opening provided in the partition wall. The lamp is accommodated in the lamp chamber so that it can be irradiated toward the
An underground lighting apparatus, wherein the opening of the partition wall is covered with a second transparent plate.   The underground illuminating device according to claim 1 or 2, wherein light absorption with a wavelength of 740 nm to 1150 nm is imparted to the second transparent plate covering the opening of the partition wall.   The underground luminaire according to any one of claims 1 to 3, wherein a radiation fin is provided on an outer periphery of the main body.   The underground illuminating device according to any one of claims 1 to 4, wherein the reflector and / or the filter is formed of a derivative multilayer film that forms a laminated body of optical thin films.

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