JP2012227277A - Led module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED module with reduced temperature rise.SOLUTION: An LED module 1 comprises a heat pipe 2 in which operation fluid 4 is sealed in a space 3 inside the pipe whose both ends are closed. An LED element 5 emitting ultraviolet light is mounted on an end surface 2a on one end side of the heat pipe 2. One end side of external wiring 6 is held on the other end side of the heat pipe 2, and the other end side of the external wiring 6 is electrically connected to a driving circuit 20 for the LED element 5. Internal wiring 7 electrically connecting between the LED element 5 and the external wiring 6 is wired outside the space 3 of the heat pipe 2. When the LED element 5 generates heat by emitting light, the heat of the LED element 5 is absorbed by the heat pipe 2 so that the temperature rise of the LED element 5 is suppressed, thereby suppressing a reduction in optical output accompanied by the temperature rise.

Description

  The present invention relates to an LED module.

  Conventionally, there has been provided an ultraviolet irradiation device that includes an ultraviolet light emitting diode, and irradiates ultraviolet light from a light emitting diode onto a printing ink mixed with an ultraviolet curable resin, and fixes the printing ink on printing paper by curing the ultraviolet curable resin. (For example, refer to Patent Document 1).

  Moreover, such an ultraviolet irradiation device is also used for the purpose of adhering components or sealing components by irradiating the ultraviolet curable resin applied to the component with ultraviolet light and curing the ultraviolet curable resin.

JP 2009-279576 A

  In the above-described ultraviolet irradiation apparatus, it is desirable to increase the irradiation intensity in order to shorten the production tact time. However, increasing the irradiation intensity increases the temperature rise of the light emitting diode. When the temperature of the light emitting diode rises, its light output decreases. Therefore, in order to increase the irradiation intensity, it is necessary to reduce the temperature rise of the light emitting diode.

  This invention is made | formed in view of the said subject, The place made into the objective is to provide the LED module which reduced the temperature rise.

  In order to solve the above problems, the LED module of the present application includes a heat pipe, an LED element, an external wiring, and an internal wiring. In the heat pipe, the working fluid is sealed in a space in a cylinder whose both ends are closed. The LED element is mounted on the end face on one end side of the heat pipe. One end side of the external wiring is held on the other end side of the heat pipe, and the other end side is electrically connected to the drive circuit unit of the LED element. The internal wiring is wired outside the space in the heat pipe, and electrically connects one end side of the external wiring and the LED element.

  In this LED module, it is also preferable that a heat radiating pipe whose thickness is thinner than that of the heat pipe and in which the space in the cylinder communicates with the space of the heat pipe is integrally provided on the other end side of the heat pipe. In this case, one end side of the external wiring is held on the other end side of the heat radiating pipe, and the internal wiring is wired outside the space in the heat pipe and the heat radiating pipe.

  In this LED module, it is also preferable that a heat radiating fin protruding outward is provided on the peripheral surface of the heat radiating pipe.

  In this LED module, it is also preferable that a temperature sensor that detects the temperature of the LED element and outputs a detection signal to the drive circuit unit is mounted on the end face on one end side of the heat pipe.

  According to the present invention, since the heat generation of the LED element is absorbed by the heat pipe, the temperature rise of the LED element can be reduced, and thereby the decrease in light output due to the temperature rise can be suppressed.

The LED module of Embodiment 1 is shown, (a) is a front view, (b) is a bottom view, (c) is sectional drawing which is partially broken. It is a perspective view same as the above. It is sectional drawing of an LED module same as the above. It is a perspective view which shows the other example of an LED module same as the above. It is a perspective view of the LED module of Embodiment 2. The other form same as the above is shown, (a) is a perspective view, (b) is an AA sectional view. It is a bottom view of the LED module of Embodiment 3.

  Hereinafter, embodiments of the LED module will be described with reference to the drawings.

(Embodiment 1)
The LED module of this embodiment will be described with reference to FIGS. In the following description, unless otherwise specified, the vertical and horizontal directions are defined in the direction shown in FIG. 1A, but the mounting direction of the LED module 1 is not limited to this direction.

  As shown in FIGS. 1 and 2, the LED module 1 of the present embodiment includes a heat pipe 2, an LED element 5, an external wiring 6, and an internal wiring 7 as main components.

  The heat pipe 2 is formed in a cylindrical shape whose both ends are closed by, for example, an aluminum alloy, and a working liquid 4 (for example, water or alternative chlorofluorocarbon) serving as a refrigerant is sealed in a space 3 in the cylinder. The heat pipe 2 is well known in the art, and is formed, for example, by filling the space 3 with a working fluid from a hole (not shown) on the surface, then vacuuming the space 3 and sealing the hole. . The heat pipe 2 constitutes the main body of the LED module 1, and when attached to a fixing jig (not shown) that supports the LED module 1, the attachment position can be easily adjusted in the axial direction and the rotational direction. It is formed in a cylindrical shape.

  The LED element 5 is disposed on the end surface 2a (for example, the lower surface in FIG. 1A) on one end side of the heat pipe 2 so that the center of the optical axis coincides with the center of the end surface. The LED element 5 emits ultraviolet light when supplied with a drive current from a drive circuit unit 20 described later.

  One end side of the external wiring 6 is held by a cylindrical cable lead-out portion 6 a provided on the other end side of the heat pipe 2 and is led out from the cable lead-out portion 6 a, and the other end side is a drive circuit for the LED element 5. 20 is electrically connected.

  The internal wiring 7 electrically connects one end side of the external wiring 6 and the LED element 5. On the peripheral surface 2b of the heat pipe 2, a groove 2c is formed from the end surface 2a on one end side to the end surface on the other end side. The internal wiring 7 is passed from the end surface 2a of the heat pipe 2 into the groove 2c and is wired to the other end side of the heat pipe 2, and is electrically connected to the external wiring 6 by the cable lead-out portion 6a. In addition, the external wiring 6 and the internal wiring 7 may be comprised with one electric wire.

  Here, when a drive current is supplied from the drive circuit unit 20 to the LED element 5 via the external wiring 6 and the internal wiring 7, the LED element 5 emits ultraviolet light, and is transmitted to the object 40 via the optical system 30. Irradiate with ultraviolet light. When the ultraviolet curable resin applied to the object 40 is irradiated with the ultraviolet light from the LED element 5, the ultraviolet curable resin is cured, so that the object 40 is fixed or adhered.

  By the way, when the LED element 5 emits light by the LED element 5 emitting light, the temperature on one end side (the side on which the LED element 5 is mounted) of the heat pipe 2 rises. The LED module 1 is used with the end face 2a on which the LED element 5 is mounted facing downward, and the working fluid 4 accumulated inside the end face 2a evaporates due to the heat generated by the LED element 5, thereby absorbing latent heat of vaporization. Then, the LED element 5 is cooled. The vapor generated by the evaporation of the hydraulic fluid 4 moves to the other end side of the heat pipe 2 at a high speed (a speed close to the speed of sound) and releases the latent heat of evaporation by aggregating at the other end side. 2 radiates heat from the other end side to the outside. Further, the agglomerated hydraulic fluid 4 moves to the lower side of the heat pipe 2 and is heated again by the heat generated by the LED element 5 to evaporate. By repeating such a cycle, the heat generation of the LED element 5 is continuously absorbed and released to the outside, and the temperature increase of the LED element 5 is suppressed, so that the light output decreases due to the temperature increase. Can be suppressed.

  As described above, the LED module 1 of this embodiment includes the heat pipe 2, the LED element 5, the external wiring 6, and the internal wiring 7. In the heat pipe 2, a working fluid 4 is sealed in a space 3 in a cylinder whose both ends are closed. The LED element 5 is mounted on the end face on one end side of the heat pipe 2. One end side of the external wiring 6 is held on the other end side of the heat pipe 2, and the other end side is electrically connected to the drive circuit unit 20 of the LED element 5. The internal wiring 7 is wired outside the space 3 in the heat pipe 2 and electrically connects one end side of the external wiring 6 and the LED element 5.

  Thereby, when the LED element 5 emits light by the LED element 5 emitting light, the heat generated by the LED element 5 is absorbed by the heat pipe 2 and can be discharged from the other end side of the heat pipe 2 to the outside. Therefore, the temperature rise of the LED element 5 can be reduced, the decrease in light output due to the temperature rise can be suppressed, and the irradiation intensity of the LED module 1 can be improved. In addition, the heat pipe 2 which makes the main body of the LED module 1 is formed of an aluminum alloy for weight reduction, and the aluminum alloy has a low thermal conductivity, so the heat dissipation is not good. Therefore, the heat generated by the LED element 5 can be efficiently radiated.

  In addition, a space 3 for filling the working fluid 4 is provided in the heat pipe 2. Since an internal wiring 7 is wired outside the space 3, the LED element 5 is connected to the heat pipe 2 via the internal wiring 7. The external wiring 6 can be electrically connected. In addition, the external wiring 6 and the internal wiring 7 may be comprised with one electric wire.

  In this embodiment, since the internal wiring 7 is wired in the groove 2 c formed on the peripheral surface of the heat pipe 2, a fixing jig (not shown) for supporting the LED module 1 is the heat pipe 2. Even when the peripheral surface is gripped, the internal wiring 7 is less likely to be sandwiched between the peripheral surface of the heat pipe 2 and the fixing jig, and the possibility that the internal wiring 7 is damaged can be reduced. In this embodiment, the internal wiring 7 is wired in the groove 2c provided on the peripheral surface. However, the internal wiring 7 only needs to be wired outside the space 3 in which the hydraulic fluid 4 is enclosed. For example, as shown in FIG. 3, a hole 2d may be provided in the peripheral wall of the heat pipe 2 from one end side to the other end side, and the internal wiring 7 may be wired in the hole 2d. In this case, the internal wiring 7 is not exposed on the outer surface of the heat pipe 2, and the fixing jig that holds the peripheral surface of the heat pipe 2 does not contact the internal wiring 7, so that the internal wiring 7 is damaged. The possibility can be further reduced.

  In the present embodiment, one LED element 5 is mounted on the end surface 2a. However, the number of LED elements 5 is not limited to one, and is matched to usage conditions such as the amount of ultraviolet light and the irradiation range. The number of LED elements 5 can be changed as appropriate. Moreover, when the some LED element 5 is mounted in the end surface of the heat pipe 2, arrangement | positioning of the some LED element 5 can be suitably changed according to use conditions, such as the irradiation range of an ultraviolet light. For example, as shown in FIG. 4, when the heat pipe 8 forming the main body of the LED module 1 is formed in a rectangular tube shape that is long in the left-right direction, a plurality of (for example, four) LED elements 5 are arranged in a row on the end face 8a. When arranged, the object can be irradiated with linear ultraviolet light. In the LED module 1, the internal wiring 7 that electrically connects the LED element 5 and the external wiring 6 is wired in a groove 8 c provided on the side surface 8 b of the square pipe-shaped heat pipe 8.

(Embodiment 2)
The LED module 1 of this embodiment is demonstrated with reference to FIG.5 and FIG.6.

  Since the LED module 1 described in Embodiment 1 is fixed by clamping the peripheral surface of the heat pipe 2 with a fixing jig (not shown), it is necessary to give the heat pipe 2 some strength. For this reason, the peripheral wall of the heat pipe 2 needs to be thick enough to obtain the required strength, which hinders improvement in heat dissipation performance.

  Therefore, in the LED module 1 of this embodiment, as shown in FIG. 5, a heat radiating pipe 9 is provided integrally with the heat pipe 2 on the other end side of the heat pipe 2. In addition, since it is the same as that of Embodiment 1 except the heat radiating pipe 9, the same code | symbol is attached | subjected to a common component and the description is abbreviate | omitted.

  The heat radiating pipe 9 is formed in a cylindrical shape in which the thickness of the peripheral wall 9a is thinner than that of the heat pipe 2, and is joined to the end face of the other end side (opposite the LED element 5) of the heat pipe 2 by welding. . In addition, the method of attaching the heat radiating pipe 9 to the heat pipe 2 is not limited to welding, and may be attached by a method such as adhesion or screw connection.

  The space 9 b in the cylinder of the heat radiating pipe 9 is connected to the space 3 in the cylinder of the heat pipe 2 through the through hole 11, and the working fluid 4 filled in the cylinder of the heat pipe 2 is connected to the LED element 5. When it evaporates due to heat generation, the vapor can move to the space 9b in the heat radiating pipe 9 as well.

  Further, in the heat radiating pipe 9, a cable lead-out portion 6a is provided at the end opposite to the heat pipe 2, and the external wiring 6 is led out from the cable lead-out portion 6a. And the internal wiring 7 which electrically connects between the LED element 5 and the external wiring 6 is wired on the peripheral surface of the heat pipe 2 and the heat radiating pipe 9.

  Here, when the LED element 5 emits light due to light emission, the working fluid 4 accumulated on the back side of the end surface 2a of the heat pipe 2 evaporates due to the heat generated by the LED element 5, and the latent heat of evaporation is taken away. 5 is cooled. The vapor of the hydraulic fluid 4 moves upward in the space 3 of the heat pipe 2, and further moves through the through hole 11 to the space 9 b of the heat radiating pipe 9. Since the peripheral wall 9a of the heat radiating pipe 9 is formed to be thinner than the peripheral wall of the heat pipe 2, heat dissipation is higher than that of the heat pipe 2, and the vapor of the working fluid 4 that has moved into the space 9b is cooled. Agglomerate. At this time, the steam latent heat released by the aggregation of the vapor of the working fluid 4 is released from the peripheral wall 9a of the heat radiating pipe 9 to the outside. The condensed working fluid 4 moves from the space 9b of the heat radiating pipe 9 to the space 3 inside the heat pipe 2 through the through hole 11, and is heated again by the heat generated by the LED element 5 and evaporates. By repeating such a cycle, the heat generation of the LED element 5 is continuously absorbed and released to the outside, and the temperature increase of the LED element 5 is suppressed, so that the light output decreases due to the temperature increase. Can be suppressed. In addition, since heat is efficiently radiated from the heat radiating pipe 9 provided on the other end side of the heat pipe 2, the effect of suppressing the temperature rise of the LED element 5 is enhanced, and the decrease in light output due to the temperature rise can be further suppressed. it can.

  By the way, although the heat radiating pipe 9 shown in FIG. 5 has a cylindrical shape, as shown in FIGS. 6 (a) and 6 (b), a plate-shaped heat radiating fin projecting outward on the peripheral surface of the heat radiating pipe 9. A plurality of 10 may be provided. The plurality of heat radiating fins 10 are formed integrally with the heat radiating pipe 9 by, for example, extrusion molding. Each radiating fin 10 extends along the axial direction of the radiating pipe 9 and is provided with a certain interval in the circumferential direction.

  Thus, since the radiation fin 10 is provided in the surrounding surface of the heat radiating pipe 9, the heat radiating area of the heat radiating pipe 9 is increased, and the heat radiating property of the heat radiating pipe 9 is improved. Therefore, the temperature rise of the LED element 5 can be further reduced, and the decrease in light output due to the temperature rise can be further suppressed.

  As described above, in the LED module 1 of this embodiment, the plate thickness is thinner than the heat pipe 2 on the other end side of the heat pipe 2, and the space in the cylinder communicates with the space of the heat pipe 2. A heat radiating pipe 9 is integrally provided. And the external wiring 6 is hold | maintained at the other end side of the heat radiating pipe 9, and the internal wiring 7 is wired outside the space 3 and the space 9b in the heat pipe 2 and the heat radiating pipe 9, respectively.

  Thereby, the heat of the LED element 5 absorbed by the heat pipe 2 can be efficiently released from the heat radiating pipe 9 to the outside, the heat generation of the LED element 5 can be further reduced, and the decrease in the light output due to the temperature rise is further suppressed. can do.

  Moreover, in the LED module 1 of this embodiment, it is also preferable that the peripheral surface of the heat radiating pipe 9 is provided with heat radiating fins 10 protruding outward.

  Thereby, the surface area of the heat radiating pipe 9 can be increased, the heat radiating performance of the heat radiating pipe 9 can be improved, the heat generation of the LED element 5 can be further reduced, and the decrease in light output due to temperature rise can be further suppressed. Can do.

(Embodiment 3)
The LED module 1 of this embodiment is demonstrated with reference to FIG.

  In the present embodiment, in the LED module 1 described in the first or second embodiment, the temperature sensor 13 that detects the temperature of the LED element 5 on the end surface 2a of the heat pipe 2 and outputs a detection signal to the drive circuit unit 20 is provided. Has been implemented. In addition, since it is the same as that of Embodiment 1 or 2 except the temperature sensor 13, the same code | symbol is attached | subjected to a common component and the description is abbreviate | omitted.

  The temperature sensor 13 is made of, for example, a thermistor, and is mounted side by side with the LED element 5 on the bonding pad 12 provided on the end surface 2 a of the heat pipe 2, and can detect a temperature close to the surface temperature of the LED element 5. . A detection signal of the temperature sensor 13 is output to the drive circuit unit 20 via the internal wiring 7 and the external wiring 6.

  The drive circuit unit 20 can detect the temperature of the LED element 5 based on the detection signal of the temperature sensor 13. When the temperature of the LED element 5 rises, the light output decreases as the temperature rises. Therefore, the drive circuit unit 20 determines that the light output is substantially constant based on the temperature of the LED element 5 detected by the temperature sensor 13. Thus, the drive current to the LED element 5 is adjusted, and the amount of ultraviolet light applied to the object 40 can be controlled to be substantially constant.

  As described above, in the LED module 1 of the present embodiment, the temperature sensor 13 that detects the temperature of the LED element 5 and outputs a detection signal to the drive circuit unit 20 is mounted on the end face on one end side of the heat pipe 2. Yes.

  Thereby, in the drive circuit unit 20, the drive current to the LED element 5 can be adjusted based on the detected temperature of the LED element 5 so that the light output from the LED element 5 becomes substantially constant, and the light output due to the temperature rise. Thus, it is possible to irradiate the target with a substantially constant amount of light.

DESCRIPTION OF SYMBOLS 1 LED module 2 Heat pipe 2a End surface 3 Space 4 Hydraulic fluid 5 LED element 6 External wiring 7 Internal wiring 20 Drive circuit part

Claims (4)

  A heat pipe in which hydraulic fluid is sealed in a space in a cylinder closed at both ends, an LED element mounted on an end face on one end side of the heat pipe, one end side is held on the other end side of the heat pipe, and others An external wiring whose end side is electrically connected to the drive circuit portion of the LED element, and a wiring outside the space in the heat pipe, and electrically between one end side of the external wiring and the LED element An LED module comprising an internal wiring for connection. The other end side of the heat pipe is integrally provided with a heat radiating pipe whose plate thickness is thinner than that of the heat pipe, and in which the space in the cylinder communicates with the space of the heat pipe,
The one end side of the external wiring is held on the other end side of the heat radiating pipe, and the internal wiring is wired outside the space in the heat pipe and the heat radiating pipe. LED module.   The LED module according to claim 2, wherein a heat radiating fin protruding outward is provided on a peripheral surface of the heat radiating pipe.   The temperature sensor which detects the temperature of the said LED element and outputs a detection signal to the said drive circuit part is mounted in the end surface of the one end side of the said heat pipe, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. The LED module as described in one.

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