JP7377686B2 - Light irradiation test device - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act On June 28, 2020, Daipra Wintes Co., Ltd. sold a light irradiation test device invented by Tomotoshi Tamada, Takuhiro Hayashi, and Takuma Fujii to Panasonic Corporation.

The present invention relates to a light irradiation test device used for light resistance tests and the like.

The light resistance test is a test that evaluates the degree of deterioration of a sample by irradiating the sample with light from a light source. In such a light resistance test, a light irradiation test device is used that irradiates the sample with light under various environments. Incandescent light bulbs, arc lamps, and the like have been used as light sources in conventional light irradiation test devices (see Patent Documents 1 and 2).

In recent years, lighting devices using LED light sources have become popular. The materials that make up lighting devices using LED light sources must be resistant to the light emitted from the LED light source, so light resistance tests must be conducted to select materials with excellent light resistance. .

Japanese Unexamined Patent Publication No. 61-3115 Japanese Patent Application Publication No. 2018-169342

When an LED light source is used, heat is accumulated inside the light source, and if the heat is not efficiently dissipated, problems arise such as malfunctions and a shortened lifespan.

However, if the LED light source is rapidly cooled using a refrigerant or the like, the amount of light (illuminance) of the LED light source will decrease.

In view of the above, an object of the present invention is to appropriately cool the LED light source in a light irradiation test device using an LED light source to maintain illuminance.

In order to achieve the above object, a light irradiation test device according to the present invention has a sample stage on which a sample is placed, and a light emitting surface facing the sample stage, and irradiates light onto the sample from the light emitting surface. at least one LED light source; a thermal conductor disposed in contact with the back surface opposite to the light emitting surface of the LED light source; and a cooling liquid disposed on the back side of the LED light source with at least a portion of the thermal conductor sandwiched therebetween. The device includes a cooling pipe that passes liquid and a blower that blows cooling gas to the LED light source, and is configured so that the cooling gas blown from the blower is guided to the light emitting surface of the LED light source.

According to the light irradiation test device according to the present invention, the back side of the LED light source can be strongly cooled by the cooling liquid, and the light emitting surface side of the LED light source can be gently cooled by the cooling gas. Therefore, by combining cooling with a cooling liquid and cooling with a cooling gas, the LED light source can be appropriately cooled without excessively cooling it, so a light irradiation test can be performed while maintaining high illuminance.

Moreover, in the light irradiation test device according to the present invention, the air outlet of the blower may face a peripheral surface connecting the light emitting surface and the back surface of the LED light source. In this way, the cooling gas blown from the blower can be guided from the peripheral surface side of the LED light source to the light emitting surface side. In this case, if the edge of the air outlet on the sample stand side is located closer to the sample stand than the light emitting surface of the LED light source, the cooling gas blown from the blower can be reliably guided to the light emitting surface of the LED light source. . Furthermore, when the edge of the air outlet opposite to the sample stand is located on the opposite side of the sample stand than the thermal conductor, the back side of the LED light source can also be cooled by the cooling gas blown from the blower. That is, the entire light source chamber in which the LED module including the LED light source, the heat conductor, and the cooling pipe is arranged can be cooled, so that the cooling efficiency of the LED light source can be further improved.

Furthermore, in the light irradiation test device according to the present invention, a partition member that transmits light may be further disposed between the LED light source and the sample stage. In this way, the light source room where the LED module is placed and the test room where the sample stage is placed are separated by the partition member, so it is possible to further improve the cooling efficiency of the LED light source by the cooling pipe and the blower. .

According to the present invention, in a light irradiation test device using an LED light source, the LED light source can be appropriately cooled and the illuminance can be maintained.

1 is a cross-sectional configuration diagram of a light irradiation test device according to Embodiment 1. FIG. 2 is a cross-sectional configuration diagram of a light irradiation test device according to a modification of Embodiment 1. FIG. FIG. 2 is a cross-sectional configuration diagram of a light irradiation test device according to a second embodiment. FIG. 3 is a cross-sectional configuration diagram of a light irradiation test device according to Embodiment 3.

(Embodiment 1)
Hereinafter, a light irradiation test device 1 according to Embodiment 1 will be described with reference to FIG. 1.

As shown in FIG. 1, the inside of the housing 2 of the light irradiation test device 1 is divided into a test chamber 4 and a light source chamber 5 by, for example, a partition member 3 that transmits the irradiated light. The housing 2 may be made of stainless steel, for example. The partition member 3 may be made of heat-resistant glass, for example. In this embodiment, the test chamber 4 is arranged on the lower side and the light source room 5 is arranged on the upper side in the vertical direction.

A sample stand 6 is arranged inside the test chamber 4, and a sample 7 to be tested is placed on the sample stand 6 during a light irradiation test. The sample stage 6 is preferably a member provided with a plurality of through holes, such as a wire mesh or expanded metal. With such a member, heat accumulation in the sample stage 6 can be suppressed, and therefore heat conduction from the sample stage 6 to the sample 7 placed thereon can be suppressed, so that the influence of temperature on the sample 7 can be suppressed. Further, the sample stage 6 may be provided with means for fixing the sample 7, such as suction means. The sample stage 6 may be held, for example, by a holding member (not shown) provided at the bottom of the test chamber 4. Alternatively, hooks for adjusting the position of the sample stage 6 may be provided on both opposing inner wall surfaces of the test chamber 4, and the sample stage 6 may be supported on the hooks.

At least one LED light source 8 for irradiating light onto the sample 7 through the partition member 3 is arranged inside the light source chamber 5 . The LED light source 8 is arranged so that the light emitting surface 8a of the LED light source 8 and the sample stage 6 face each other. In this embodiment, the light emitting surface 8a of the LED light source 8 is set to be parallel to the horizontal plane.

As the LED light source 8, for example, an LED chip such as a COB (chip on board) or an SMD (surface mount device) may be used, but it is preferable to use a COB for light irradiation tests that require particularly high illuminance. preferable. Although one LED light source 8 may be used, a plurality of LED light sources 8 may be used in order to perform a light irradiation test with higher illuminance. In the latter case, a plurality of LED light sources 8 may be arranged in a matrix. Further, the wavelength of the light irradiated from the LED light source 8 may be appropriately selected according to the environment in which the sample 7 is used. For example, when assuming indoor use, an LED light source 8 that emits light in the visible light region (wavelength 380 nm to 780 nm) can be selected.

A thermal conductor 9 is arranged so as to be in contact with the back surface 8b (the surface opposite to the light emitting surface 8a) of the LED light source 8. The constituent material of the thermal conductor 9 is not particularly limited as long as it has a high thermal conductivity, but from the viewpoint of cooling efficiency, for example, aluminum may be used. The thermal conductor 9 is held by a holding member (not shown) provided, for example, on the side wall or ceiling of the light source chamber 5. LED light source 8 is attached to thermal conductor 9 .

A cooling pipe 10 is arranged on the rear surface 8b side of the LED light source 8 with at least a portion of the heat conductor 9 interposed therebetween. A cooling liquid 11 such as cooling water flows through the cooling pipe 10 . The cooling pipe 10 is cyclically connected to a refrigerator (not shown) disposed outside the housing 2 . In this embodiment, as an example, the cooling pipe 10 is embedded in the heat conductor 9 along the arrangement of the LED light sources 8. The temperature of the coolant 11 can be adjusted depending on the refrigerator used, and may be set to about 28 to 32° C., for example.

A first air outlet 12a of a first air blower 12, such as a blower fan, is provided in the side wall of the light source chamber 5, for example. That is, in this embodiment, the first air outlet 12a faces the peripheral surface of the LED light source 8 (the surface connecting the light emitting surface 8a and the back surface 8b). A main body (not shown) of the first blower 12 is disposed outside the housing 2, and a blow pipe extends from the main body to the first blow port 12a. An exhaust port (not shown) is provided in the side wall or ceiling of the light source chamber 5.

The first blower 12 blows a cooling gas 13 such as cooling air to the LED light source 8 . The first blower 12 may have a temperature adjustment function. The temperature of the cooling gas 13 can be adjusted by the first blower 12 used, and may be set to about 25 to 35° C., for example.

The light irradiation test device 1 of this embodiment is configured so that the cooling gas 13 blown from the first blower 12 is guided to the light emitting surface 8a of the LED light source 8. Specifically, the edge of the first air outlet 12a of the first blower 12 on the test chamber 4 side (that is, on the sample stage 6 side) is located closer to the sample stage 6 than the light emitting surface 8a of the LED light source 8. For example, the edge of the first air outlet 12a on the sample stage 6 side is located closer to the sample stage 6 by a distance d in the vertical direction than the light emitting surface 8a of the LED light source 8. Note that the edge of the first air blower 12 a of the first blower 12 on the opposite side of the test chamber 4 (that is, the opposite side of the sample stage 6 ) is located on the opposite side of the sample stage 6 from the thermal conductor 9 .

A second air outlet 14a of a second blower 14, such as a blower fan, is provided in the side wall of the test chamber 4 in order to maintain the inside of the test chamber 4 at a predetermined temperature. A main body (not shown) of the second blower 14 is disposed outside the housing 2, and a blow pipe extends from the main body to the second blow port 14a. An exhaust port (not shown) is provided in the side wall or bottom of the test chamber 4. The second blower 14 blows a gas 15 such as air onto the sample 7 . The second blower 14 may have a temperature adjustment function. Although the temperature of the gas 15 can be adjusted by the second blower 14 used, it may be set to, for example, about 60 to 120° C. when the LED light source 8 is turned on.

Although not shown, the light irradiation test device 1 may have an operation unit (for example, a touch panel) on the outer wall surface of the housing 2 for operating the LED light source 8, the blowers 12, 14, etc. .

According to the light irradiation test device 1 of the present embodiment described above, the back surface 8b side of the LED light source 8 can be strongly cooled by the cooling liquid 11, and the light emitting surface 8a side of the LED light source 8 can be gently cooled by the cooling gas 13. . Therefore, by combining cooling with the cooling liquid 11 and cooling with the cooling gas 13, it is possible to appropriately cool the LED light source 8 without excessively cooling it, so it is possible to perform the light irradiation test while maintaining high illuminance. I can do it. Furthermore, it is possible to prevent the LED light source 8 from accumulating heat and malfunctioning. Particularly, when the illumination intensity of the LED light source 8 is about 3 million lux or more, the LED light source 8 accumulates heat and becomes high temperature, so cooling with a cooling liquid is necessary. is remarkable.

In addition, in the light irradiation test device 1 of this embodiment, since the air outlet 12a of the air blower 12 faces the circumferential surface connecting the light emitting surface 8a and the back surface 8b of the LED light source 8, the cooling gas blown from the air blower 12 13 can be guided from the peripheral surface side of the LED light source 8 to the light emitting surface 8a side. In this case, since the edge of the air outlet 12a on the sample stand 6 side is located closer to the sample stand 6 than the light emitting surface 8a of the LED light source 8, the cooling gas 13 blown from the air blower 12 is It can be reliably guided to the surface 8a. In addition, since the edge of the air outlet 12a on the opposite side of the sample stand 6 is located on the opposite side of the sample stand 6 than the thermal conductor 9, the rear surface 8b side of the LED light source 8 is also cooled by the air blowing from the blower 12. It can be cooled by gas 13. That is, since the entire light source chamber 5 in which the LED module including the LED light source 8, the heat conductor 9, and the cooling pipe 10 is arranged can be cooled, the cooling efficiency of the LED light source 8 can be further improved.

Furthermore, in the light irradiation test apparatus 1 of the present embodiment, there is a partition between the light source chamber 5 and the test chamber 4 (that is, between the LED light source 8 and the sample stage 6) that allows the light irradiated from the LED light source 8 to pass through. Since the member 3 is arranged, the cooling efficiency of the LED light source 8 by the cooling pipe 10 and the blower 12 can be further improved.

In this embodiment, the temperature of the cooling gas 13 may be set to be equal to or lower than the temperature of the cooling liquid 11. In this way, dew condensation is less likely to occur in the light source chamber 5, so it is possible to suppress the occurrence of failure of the LED light source 8 and the like. For example, the temperatures of the cooling gas 13 and the cooling liquid 11 may be set to the same temperature of 30°C. Furthermore, in order to further suppress the occurrence of dew condensation within the light source chamber 5, a dehumidifying means such as a dehumidifier may be provided within the light source chamber 5.

(Modification of Embodiment 1)
Hereinafter, a light irradiation test device 1 according to a modification of the first embodiment will be described with reference to FIG. 2. In FIG. 2, the same components as in the first embodiment shown in FIG. 1 are given the same reference numerals.

The light irradiation test apparatus 1 of this modification is different from the first embodiment in that the test chamber 4 and the light source chamber 5 are arranged horizontally, as shown in FIG. Here, the light emitting surface 8a of the LED light source 8 is set to be parallel to the vertical plane. That is, the LED light source 8 emits light in the horizontal direction.

Also in the light irradiation test device 1 of this modification described above, the same effects as in the first embodiment can be obtained.

(Embodiment 2)
Hereinafter, the light irradiation test device 1 according to the second embodiment will be described with reference to FIG. 3. In FIG. 3, the same components as in the first embodiment shown in FIG. 1 are given the same reference numerals.

The light irradiation test device 1 of this embodiment is different from the first embodiment as shown in FIG. 3, as shown in FIG. The edge is located on the opposite side of the sample stage 6 from the light emitting surface 8a of the LED light source 8, and is between the LED module having the LED light source 8, the thermal conductor 9, and the cooling pipe 10, and the first air outlet 12a. Additionally, a guide member 21 is provided that guides the cooling gas 13 blown from the first blower 12 to the light emitting surface 8a of the LED light source 8.

Also in the light irradiation test device 1 of this embodiment described above, the same effects as in the first embodiment can be obtained.

In this embodiment, instead of installing the guide member 21, the air pipe of the first blower 12 is extended into the light source chamber 5, and the first air outlet 12a is arranged near the light emitting surface 8a of the LED light source 8. You may.

(Embodiment 3)
Hereinafter, the light irradiation test device 1 according to Embodiment 3 will be described with reference to FIG. 4. In FIG. 4, the same components as in the first embodiment shown in FIG. 1 are given the same reference numerals.

The light irradiation test device 1 of this embodiment differs from the first embodiment in that, as shown in FIG. Cooling gas 13 blown from the first blower 12 is guided to the light emitting surface 8a of the LED light source 8 between the LED module having the light source 8, the heat conductor 9, and the cooling pipe 10 and the side wall of the light source chamber 5. A guide member 22 is provided. That is, the cooling gas 13 blown out from the first air outlet 12a in the ceiling of the light source chamber 5 heads toward the side wall of the light source chamber 5 along the surface of the heat conductor 9 on the opposite side of the LED light source 8. The guide member 22 bypasses the LED module and reaches the light emitting surface 8a side of the LED light source 8.

Also in the light irradiation test device 1 of this embodiment described above, the same effects as in the first embodiment can be obtained.

In this embodiment, the air pipe of the first air blower 12 may penetrate the ceiling of the light source chamber 5 and terminate at the first air outlet 12a, or may penetrate the side wall of the light source chamber 5. It may extend along the ceiling of the light source chamber 5 to near the center of the ceiling and terminate at the first air outlet 12a. That is, in this embodiment and other embodiments (including modified examples), the route of the air pipe from the main body of the first blower 12 to the first air outlet 12a and the position where the air pipe penetrates the housing 2 are , but is not particularly limited.

Furthermore, a light resistance test method is provided in which the light resistance of the sample 7 is tested using the light irradiation test device 1 according to each of the above-described embodiments (including modified examples). According to this light resistance test method, it is possible to irradiate high intensity light from the LED light source 8, so that light resistance can be evaluated in a short period of time. Furthermore, if the wavelength of the light emitted from the LED light source 8 is in the visible light region (wavelength 380 nm to 780 nm), the light resistance of the sample 7 for indoor use can be appropriately evaluated.

Although the embodiments and modifications have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the claims. Furthermore, the above embodiments and modifications may be combined or replaced as appropriate, as long as the functionality of the object of the present disclosure is not impaired. Furthermore, the descriptions such as "first", "second", etc. mentioned above are used to distinguish the words to which these descriptions are given, and they also limit the number and order of the words. isn't it.

1 Light irradiation test device 1
2 Housing 3 Partition member 4 Test chamber 5 Light source room 6 Sample stand 7 Sample 8 LED light source 8a Light emitting surface 8b Back surface 9 Heat conductor 10 Cooling pipe 11 Coolant 12 First blower 12a First blower 13 Cooling gas 14 Second blower 14a Second ventilation port 15 Gas 21 Guide member 22 Guide member

Claims (6)

a sample stage on which the sample is placed;
at least one LED light source having a light emitting surface facing the sample stage and irradiating the sample with light from the light emitting surface;
a thermal conductor disposed in contact with the back surface of the LED light source opposite to the light emitting surface;
a cooling pipe disposed on the back side of the LED light source with at least a portion of the thermal conductor sandwiched therebetween, and through which a cooling liquid flows;
and a blower that blows cooling gas to the LED light source,
The cooling gas blown from the blower is configured to be guided to the light emitting surface of the LED light source ,
The air outlet of the blower faces a peripheral surface connecting the light emitting surface and the back surface of the LED light source,
With a direction from the LED light source toward the sample stage as a first direction, an edge of the air outlet on the first direction side is located closer to the first direction than the light emitting surface of the LED light source,
A light irradiation test device, wherein a direction from the sample stage toward the LED light source is defined as a second direction, and an edge of the air outlet on the second direction side is located closer to the second direction than the thermal conductor. a sample stage on which the sample is placed;
at least one LED light source having a light emitting surface facing the sample stage and irradiating the sample with light from the light emitting surface;
a thermal conductor disposed in contact with the back surface of the LED light source opposite to the light emitting surface;
a cooling pipe disposed on the back side of the LED light source with at least a portion of the heat conductor sandwiched therebetween, and through which a cooling liquid flows;
and a blower that blows cooling gas to the LED light source,
The cooling gas blown from the blower is configured to be guided to the light emitting surface of the LED light source ,
A light irradiation test device, wherein a guide member for guiding the cooling gas to the light emitting surface of the LED light source is provided inside a light source chamber in which the LED light source is arranged. The light irradiation test device according to claim 2 , wherein the air blower opening faces a peripheral surface connecting the light emitting surface and the back surface of the LED light source. A first direction is defined as a direction from the LED light source toward the sample stage, and an edge of the air outlet on the first direction side is located closer to the first direction than the light emitting surface of the LED light source. 3. The light irradiation test device according to 3 . Claim 3 or 4 , wherein a direction from the sample stage toward the LED light source is defined as a second direction, and an edge of the air outlet on the second direction side is located closer to the second direction than the thermal conductor. The light irradiation test device described in . The light irradiation test device according to claim 1, further comprising a partition member that allows the light to pass through between the LED light source and the sample stage .

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