JP4369649B2 - Lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting device, and more particularly to a lighting device including a small light emitting unit using a light emitting diode or the like.
[0002]
[Prior art]
FIG. 3 is a schematic diagram showing an example of the structure of a conventional lighting device. In the conventional lighting device, a reflection surface 52a is provided on the inner peripheral surface of the reflection unit 52 formed of a housing having an irradiation opening on the front side, and irradiation light from the light emitting unit 51 fixed inside the reflection unit 52 is reflected on the reflection surface 52a. And is irradiated from the irradiation opening. The heat generated from the light emitting unit 51 is transferred to the heat radiating unit 53 including heat radiating fins disposed on the back surface of the light emitting unit 51 and radiated into the air, thereby suppressing the temperature rise of the light source. Here, in order to increase the contact area between the light emitting unit and the air, the radiating fin has a structure in which a plurality of thin plate-like plate members are arranged at a constant interval, and has a large surface area. The light emitting unit 51 is composed of a plurality of light emitting diodes 51a arranged in a straight line.
However, since this prior art does not relate to a known literature invention, there is no prior art document information to be described.
[0003]
[Problems to be solved by the invention]
However, in order to suppress the temperature rise of the light source, increasing the surface area of the radiating fin to increase the efficiency of radiating heat requires a wide space for radiating heat around the radiating fin, and the lighting device is enlarged. There was a problem to do. In particular, an illumination device using a light-emitting diode as a light source has a problem that it is difficult to reduce the size because a large heat-dissipating fin must be attached even though the light-emitting diode is extremely small.
[0004]
Therefore, the present invention has been made to solve the above-described problems and to provide an illumination device that has excellent heat dissipation characteristics and can be miniaturized.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, an illumination device of the present invention includes a light emitting unit, a reflecting unit having a reflecting surface that reflects and diffuses light emitted from the light emitting unit, and a heat radiating unit that radiates heat generated by the light emitting unit. When, in the illumination device having the above-mentioned reflection unit, a base material made of a metal material, Ri Do and a reflective layer containing a ceramic for radiating far infrared rays is formed on the surface of the substrate, film of the reflective layer The thickness is 200 μm or less .
[0006]
In the illuminating device of the present invention, a reflective layer containing ceramics that radiates far infrared rays is provided on the reflective surface of the reflective unit. Therefore, the reflected layer dissipates heat from the light emitting unit as far infrared rays, and the light source Temperature rise can be suppressed. Thereby, since the conventional reflection unit can be made to act as a heat radiator, the surface area of the heat radiating unit can be reduced as compared with the case where heat is radiated only by the heat radiating unit, and the lighting device can be downsized.
[0007]
In addition, the lighting device of the present invention also has an insect repellent effect that prevents attracting insects during lighting. For this reason, the lighting device and its surroundings are not soiled by the attracted insects, so that it is not necessary to clean frequently and is hygienic. Conventionally, with respect to insect control of lighting devices, there are methods such as applying a chemical solution for insecticide to the surface of the lighting device and preventing the ultraviolet light that attracts insects from coming out by using a filter or the like. It was used. However, the lighting device of the present invention is safe for the human body without the use of insecticide chemicals, and it is not necessary to use a new member such as a filter. The degree of freedom is also improved. The reason for this is not necessarily clear, but it is considered that far infrared rays emitted from ceramics have a repellent effect on insects.
[0008]
In the illumination device of the present invention, the reflection unit can also serve as the heat dissipation unit. Thereby, since a heat radiating unit becomes unnecessary, it becomes possible to further miniaturize an illuminating device.
[0009]
Moreover, the illumination device of the present invention is selected from the group consisting of at least Al ₂ O ₃ , SiO ₂ , SnO ₂ , MgO, CaO, ZrO ₂ , TiO ₂ , and Li ₂ O as ceramics that emits far infrared rays. Those containing one or more oxides can be used. Preferably, from the group consisting of Al ₂ O ₃ —SiO ₂ , ZrO ₂ —SiO ₂ , TiO ₂ —Al ₂ O ₃ , Al ₂ O ₃ —SiO ₂ —TiO ₂ , Al ₂ O ₃ —SiO ₂ —SnO _2. What contains 1 type selected can be used.
[0010]
In the lighting device of the present invention, a light emitting unit having at least one light emitting diode can be used. A white light emitting diode is preferably used as the light emitting diode.
[0011]
In the illumination device of the present invention, the light-emitting diode is a blue or ultraviolet light-emitting diode, and the reflection layer absorbs light emitted from the blue or ultraviolet light-emitting diode, and emits light having a wavelength longer than the wavelength of the light emitted. Those containing phosphors emitting light can be used.
[0012]
Moreover, the illuminating device of this invention can also provide the heat transfer unit which transfers the heat which generate | occur | produced from the light emission unit to a reflection unit. Moreover, a heat pipe or a heat plate can be used for the heat transfer unit.
[0013]
The illuminating device of the present invention can be used for a stationary illumination device that is fixed to a wall or the like and suspended from a ceiling or the like.
That is, the installation type illumination device of the present invention includes a reflection unit composed of a casing having an irradiation opening and a plurality of light emitting diodes arranged in a straight line, and the light emission unit fixed inside the reflection unit. A reflective unit having a film thickness of 200 μm or less containing ceramics that emits far-infrared rays on the inner peripheral surface of the base material. The light-emitting unit is fixed to a fixing member fixed inside the reflection unit so that the light emitted from the light-emitting diode can be applied to the reflection surface, and the light emitted from the light-emitting unit is provided. Is reflected from the reflecting surface and irradiated from the irradiation opening.
[0014]
The hanging type illumination device of the present invention comprises a light emitting unit having a plurality of light emitting diodes arranged in a straight line and a base material made of a metal material, and radiates far infrared rays on the surface of the base material. A reflective unit comprising a reflective layer having a thickness of 200 μm or less containing ceramics to be used , and a reflective unit also serving as a cover for the light emitting unit, and heat generated from the light emitting unit supported by the reflective unit to the reflective unit And a heat transfer unit that also serves as a suspension member for suspending the light emitting unit, and the irradiation light from the light emitting unit is reflected by the reflecting surface of the reflecting unit to be transmitted to the light emitting unit. A lighting device irradiated downward.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a schematic diagram showing an example of the structure of the illumination device A according to the present embodiment, and is a stationary illumination device that is used by being fixed to a wall, a pillar, or the like. (A) is a perspective view of the illuminating device A, (b) is a perspective view showing a partial cross-sectional structure of the illuminating device A.
The illuminating device A includes a reflection unit 2 including a housing having an irradiation opening 3 on the front side, a light-emitting unit 1 having a plurality of light-emitting diodes 1a arranged linearly and fixed inside the reflection unit 2, The reflected light is irradiated from the irradiation opening 3 by reflecting the irradiation light from the light emitting unit 1 on the reflection surface 2 a provided on the inner peripheral surface of the reflection unit 2. Here, the reflective surface 2a is comprised from the reflective layer containing the ceramics which radiate | emit far infrared rays. The light emitting unit 1 is fixed to a fixing member 2b fixed inside the reflecting unit 2 so that the light irradiated from the light emitting diode 1a can be irradiated to the reflecting surface 2a. The illumination device A is attached and fixed to a wall surface (not shown) via an attachment portion (not shown) provided on the back surface of the reflection unit 2.
[0016]
The reflective unit can be made of a metal material with good heat dissipation such as aluminum or stainless steel. Moreover, the shape will not be specifically limited if it is a housing | casing which has an irradiation opening in the front side and has the space which can accommodate a light emission unit inside. Further, the fixing member 2b for fixing the light emitting unit may be integrated with or separate from the reflecting unit 2. However, in the case of a separate member, in order to efficiently transmit the heat of the light emitting unit to the reflecting unit, heat radiation such as aluminum or stainless steel is used. It is preferable to use a metal material with good properties.
[0017]
Further, in the ceramic to be contained in the reflective layer, it is possible to use a known material for emitting far infrared _{rays, Al 2 O 3, SiO 2} , SnO 2, MgO, CaO, ZrO 2, TiO 2, Li 2 O It is preferable to use a sintered body sintered at a predetermined temperature using at least one oxide selected from the group consisting of More preferably, Al ₂ O ₃ —SiO ₂ , ZrO ₂ —SiO ₂ , TiO ₂ —Al ₂ O ₃ , and Al ₂ O ₃ —SiO ₂ —TiO ₂ , Al ₂ O ₃ —SiO ₂ —SnO ₂ A sintered body having any composition. This is because far infrared rays can be emitted strongly.
[0018]
The reflective layer is prepared by dispersing the binder resin and the sintered body in a solvent composed of water or an organic solvent to prepare a coating liquid, applying the coating liquid to the inner peripheral surface of the reflective unit, and then applying the solvent at room temperature or by heating. It can be formed by removing. In order to apply the coating liquid, methods such as spraying, roll coating, and brush coating can be used. Here, the thickness of the reflective layer is preferably 200 μm or less. When it is thicker than 200 μm, the thermal conductivity of the reflective layer itself is lowered, and heat from the light source is hardly transmitted to the surface of the reflective layer. Therefore, it is difficult for far infrared rays to be emitted from the surface of the reflective layer. Moreover, the reflective layer containing fluorescent substance can also be formed by mixing a predetermined amount of fluorescent substance with said coating liquid.
[0019]
As the light source of the light emitting unit, one or more light emitting diodes arranged at predetermined positions can be used. The arrangement of the light sources is not particularly limited. For example, the light sources can be arranged linearly in one row, or can be arranged linearly in a plurality of rows.
[0020]
Moreover, it is preferable to use a white light emitting diode as the light emitting diode used for the light source of the light emitting unit. As the white light emitting diode, a light emitting diode in which a phosphor capable of absorbing a part of light emitted from a blue or ultraviolet LED and emitting a complementary color can be used on a blue or ultraviolet LED chip. For example, a blue or ultraviolet LED chip molded with a translucent resin containing a phosphor can be used. Here, in the case of a blue LED using a nitride-based semiconductor capable of emitting blue light (In _x Al _y Ga _1-xy N, 0 ≦ X, 0 ≦ Y, X + Y ≦ 1), YAG: Ce phosphors and perylene derivatives are preferably used. In the case of an ultraviolet LED that emits ultraviolet light, it is preferable to use an alkaline earth metal halogen apatite phosphor activated by Eu containing at least Mn and / or Cl.
[0021]
Further, instead of the white light emitting diode, a blue or ultraviolet light emitting diode can be used as the light source. When a blue or ultraviolet light emitting diode is used, for example, white irradiation light can be obtained by including a phosphor in the reflective layer. That is, a phosphor capable of absorbing a part of light emitted from a blue or ultraviolet light emitting diode and emitting a complementary color is included in the reflective layer. Part of the blue light or ultraviolet light absorbed by the reflective layer is absorbed by the phosphor and emits a complementary color, and the complementary color light and the blue light or ultraviolet light are mixed to obtain white light. Can do. As described above, the phosphor is activated by Eu containing at least Mn and / or Cl in the case of a blue LED in the case of a blue LED, and in the case of an ultraviolet LED in the case of an ultraviolet LED. Alkaline earth metal halogen apatite phosphors can be used.
[0022]
In this embodiment, the heat generated in the light emitting unit is transmitted to the reflecting unit through the fixing member, and the heat is dissipated as far infrared rays from the reflecting layer of the reflecting unit. The unit can be eliminated, and the lighting device can be reduced in size. In particular, when a semiconductor light-emitting element such as a light-emitting diode is used as the light source, the lighting device can be downsized while suppressing the temperature rise of the light-emitting unit. Can be obtained.
[0023]
Embodiment 2. FIG.
The illuminating device according to the present embodiment is an illuminating device configured to transmit heat generated in the light emitting unit to the reflecting unit via the heat transfer unit. FIG. 2 is a schematic diagram showing an example of the structure of the lighting device B according to the present embodiment, and is a hanging type lighting device that is used by being hung on a ceiling or the like. (A) is the perspective view which looked at the illuminating device from the downward direction, (b) is the perspective view which looked at the illuminating device from the top.
The illuminating device B includes a light emitting unit 11 having a plurality of light emitting diodes 11a arranged in a straight line, and a reflecting surface 12a made of a reflective layer containing ceramics that emits far infrared rays, and also serves as a cover of the light emitting unit. The unit 12 includes a heat transfer unit 13 that is supported by the reflection unit 12 and includes a ring-shaped heat pipe that transmits heat generated from the light-emitting unit 11 to the reflection unit 12 and also serves as a suspension member that suspends the light-emitting unit 11. . Irradiation light from the light emitting unit 11 is reflected by the reflecting surface 12 a of the reflecting unit 12, and the reflected light is irradiated below the light emitting unit 11. Here, since the reflection unit 12 also serves as a heat dissipation unit, the heat dissipation unit is unnecessary. Note that a suspension member (not shown) is connected to a connection member (not shown) provided in the reflection unit 12, and the lighting device B is suspended from a ceiling or the like.
[0024]
The reflective layer and the light-emitting unit in this embodiment can be the same as those in Embodiment 1. Hereinafter, differences from the first embodiment will be described.
[0025]
(Reflection unit)
The reflection unit is formed of a thin plate having a curved shape protruding in the finger direction of the light emitting unit, and is disposed so as to cover the light emitting unit. Furthermore, the heat pipe support part 14 provided with the protrusion part 14a which has the through-hole which can insert a heat pipe loosely is arrange | positioned on the opposite surface of a reflective surface.
[0026]
(Light emitting unit)
On the other hand, the light emitting unit can be the same as that of the first embodiment except that the heat pipe fixing portion 15 for fixing the heat pipe is provided on the back surface. The heat pipe fixing part 15 has a fitting groove 15a extending in the longitudinal direction, and the lower part of the heat pipe is fitted into the fitting groove 15a to fix the heat pipe to the light emitting unit.
[0027]
(heat pipe)
For example, a heat pipe is a metal tube made of a metal material such as copper or aluminum, in which a working fluid for heat transport such as water, chlorofluorocarbon, alternative chlorofluorocarbon, or florinate is sealed. ), The hydraulic fluid is heated to become vapor, and the vapor moves to the heat radiating section (low temperature section) and dissipates heat to liquefy, and the liquefied hydraulic fluid returns to the heat input section by capillary action. Thus, the heat transfer member achieves extremely high thermal conductivity.
[0028]
The heat pipe used in the present embodiment has a ring shape with a substantially circular cross section, and the upper part is loosely inserted into the through hole of the protrusion 14a of the heat pipe support part 14 of the reflection unit and is rotatably supported. On the other hand, the lower part opposite to the upper part is fitted and fixed in the fitting groove of the heat pipe fixing part 15 of the light emitting unit. As a result, the light emitting unit can be pivotably suspended from the reflecting unit.
[0029]
According to the present embodiment, as in the first embodiment, the heat generated in the light emitting unit is dissipated as far infrared rays from the reflective layer of the reflecting unit, so that a conventional heat radiating unit such as a heat radiating fin is unnecessary. The lighting device can be downsized.
[0030]
In the second embodiment, the example in which the heat transfer unit is provided in the hanging type lighting device is shown. However, in the wall-mounted lighting device shown in the first embodiment, the space between the light emitting unit and the reflecting unit is described. Even if the heat transfer unit is provided, the same effect as in the second embodiment can be obtained. For example, by disposing a heat plate in place of the fixing member of Embodiment 1, heat generated in the light emitting unit can be quickly transmitted to the reflecting unit.
[0031]
【The invention's effect】
As described above, in the lighting device of the present invention, the reflecting surface of the reflecting unit is configured by a reflecting layer containing ceramics that radiates far infrared rays, and heat generated in the light emitting unit is radiated as far infrared rays by the reflecting layer. Since it did in this way, the conventional heat radiating units, such as a heat radiating fin, can be made small or unnecessary. As a result, when a semiconductor light emitting element such as a light emitting diode is used as the light source, it is possible to reduce the size of the lighting device while suppressing the temperature rise of the light emitting unit. A lighting device capable of emitting light can be obtained. Further, since the heat radiating unit is not required, the degree of design freedom is increased, and it is possible to provide an illumination device that is excellent in design. Moreover, since it has an insect repellent effect, it is hygienic without contaminating the lighting device and its surroundings.
[Brief description of the drawings]
FIGS. 1A and 1B are schematic views showing an example of the structure of a lighting device according to Embodiment 1 of the present invention, where FIG. 1A is a perspective view and FIG. 1B is a perspective view showing a partial cross section;
2A and 2B are schematic views showing an example of the structure of a lighting device according to Embodiment 2 of the present invention, where FIG. 2A is a perspective view of the lighting device viewed from below, and FIG. FIG. 3 is a perspective view showing an example of the structure of a conventional lighting device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,11 Light emitting unit, 1a, 11a Light emitting diode, 2,12 Reflection unit, 2a, 12a Reflective surface, 2b Fixing member, 3 Irradiation opening, 13 Heat pipe, 14 Heat pipe support part, 14a Projection part, 15 Heat pipe Fixed part, 15a Fitting groove, A and B lighting device.

Claims (1)

A light emitting unit having a plurality of light emitting diodes arranged in a straight line;
A reflective surface composed of a base material made of a metal material, the surface of the base material comprising a reflective layer having a film thickness of 200 μm or less, containing ceramics that emits far infrared rays, and also serves as a cover for the light emitting unit Unit,
A heat transfer unit that is supported by the reflection unit and that includes a ring-shaped heat pipe that transmits heat generated from the light-emitting unit to the reflection unit, and also serves as a suspension member that suspends the light-emitting unit.
The illuminating device in which the irradiation light from the light emitting unit is reflected by the reflecting surface of the reflecting unit and irradiated below the light emitting unit.

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