JP5155463B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device including a radiator that dissipates heat from a heating element to the outside by natural convection.

  The lighting device generally contains heat-generating components (heating elements) such as a light source and power supply circuit components, and suppresses the temperature rise of the heat-generating components in order to ensure the performance of the heat-generating components accommodated therein. At the same time, it is necessary to be configured to suppress the temperature rise on the outer surface of the lighting device from the viewpoint of safety. In particular, in an illuminating device using a light emitting diode (hereinafter referred to as LED) as a light source, as the temperature of the LED increases, the life characteristics of the LED deteriorates and the light emission efficiency decreases, making it difficult to secure the necessary light quantity. Since there is a possibility that a problem may occur, it is necessary to have a structure with good heat dissipation in order to suppress the temperature rise of the LED.

  In addition, since lighting devices such as spotlights and downlights have a high-output light source that emits light with a high light emission intensity, they include a radiator to dissipate the heat generated by the light source to the outside (for example, , See Patent Document 1).

  The downlight disclosed in Patent Document 1 includes a lamp that is a heating element, a lamp that houses the lamp inside, and a translucent opening that is provided in a recessed hole provided in the ceiling on the opposite side of the translucent opening. An instrument body that can be attached and a plurality of fins projecting in a radial direction over an appropriate length in the vertical direction of the instrument body as a radiator. With this configuration, the heat generated by the lamp is transmitted to the plurality of fins via the instrument body, and is radiated from the surface of the fin to the air.

Japanese Patent Laid-Open No. 9-293410

  In particular, in lighting devices such as spotlights and downlights, there is a demand to increase the output of a light source while reducing the size of the lighting device. In particular, in the case of a downlight, since the external dimensions are set from the indoor side, the external dimensions are restricted by the mounting hole size, and the height is also restricted by the space behind the ceiling. For this reason, it is necessary to improve heat dissipation, without enlarging the external dimension of a radiator. In a lighting device in which fins are radially provided such as the downlight disclosed in Patent Document 1, it is considered to increase the number of fins in order to increase the heat radiation area without changing the external dimensions of the heat radiator. It is done. However, when the number of fins is increased, the gap between the fins, especially the gap on the fin base side, becomes narrower, making it difficult for air to flow into the vicinity of the fin root, which is a high temperature part, and heat transfer from the fin to the air. May be insufficient.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an illuminating device capable of improving heat dissipation by spreading a heat exchange medium such as air without increasing the external dimensions. And

An illuminating device according to the present invention is an illuminating device comprising: an LED light source; a power source that supplies current to the LED light source; and a heat radiating unit that houses the power source and radiates heat from the LED light source. The heat dissipating part includes a plurality of heat dissipating fins, the heat dissipating fins having a spiral shape, and a ventilation path through which air passes from one end of the lighting device body to which the LED light source is attached to the other end. forming a, and characterized by the formation tare Rukoto as the thickness becomes thinner toward the other end from the one end.

In the present invention, a plurality of heat radiation fins having a spiral shape are provided in the heat radiation part for radiating heat from the LED light source, and air is passed through the ventilation path formed by these heat radiation fins. The heat dissipation can be improved without increasing the value. Moreover, the thickness of the heat radiation fin is such that one end side that is high temperature near the LED light source is thick and the other end side that is relatively low temperature is thin, so that the heat transmitted from the LED light source is changed from the high temperature side to the low temperature side. Heat conduction can be further improved by smooth conduction.

  The illuminating device according to the present invention is characterized in that a frame is provided at the one end of the heat radiating portion, and the frame has a slit that leads to the ventilation path.

  In the present invention, since a slit leading to the ventilation path is formed in the frame provided at one end of the heat radiation part on the LED light source mounting side, the heat from the LED light source is released well to the ventilation path, and the heat dissipation performance is improved. Can be improved.

  In the illumination device according to the present invention, the heat radiating portion includes a heat transfer plate having the LED light source attached on one surface thereof, and a heat radiating tube provided on the other surface of the heat transfer plate, The power supply unit is housed inside, and the plurality of heat dissipating fins project from the outer surface.

  In the present invention, the LED light source is mounted on one surface of the heat transfer plate, and the heat radiating tube is provided on the other surface, and a plurality of heat radiating fins are projected on the outer surface of the heat radiating tube. Heat dissipation can be improved by conducting the heat transfer fins and heat radiating tubes to the heat radiating fins.

  According to the present invention, heat dissipation can be improved without increasing the outer dimensions.

It is an external appearance perspective view of the illuminating device which concerns on the reference form 1. FIG. It is a typical side view of an illuminating device. It is a typical back view of an illuminating device. It is typical sectional drawing by the IV-IV line of FIG. It is an external appearance perspective view of the illuminating device which concerns on the reference form 2. FIG. It is a typical fragmentary sectional view of the illuminating device which concerns on the reference form 3. FIG. 1 is an external perspective view of a lighting device according to Embodiment 1. FIG. It is a typical side view of an illuminating device. It is a typical back view of an illuminating device. It is a longitudinal cross-sectional perspective view of an illuminating device. It is a figure which shows the fin of another shape schematically. It is a figure which shows the fin of another shape schematically. It is a figure which shows the fin of another shape schematically. It is a figure which shows schematically the heat-transfer structure of a power supply part. It is a figure which shows schematically the other heat-transfer structure of a power supply part. It is an external appearance perspective view of a heat radiator. It is typical sectional drawing of an illuminating device provided with a heat radiator. It is a figure which briefly shows the heat radiator of another shape. It is an external appearance perspective view of the heat radiator of another shape. It is a figure which shows schematically the positional relationship of a heat radiator and a power supply part. It is an external appearance perspective view of the heat radiator of another shape. It is a figure which shows schematically the positional relationship of a heat radiator and a power supply part. It is an external appearance perspective view of the heat radiator of another shape. It is an external appearance perspective view of the heat radiator of another shape. It is typical sectional drawing of the heat radiator by the XXV-XXV line | wire of FIG. It is an external appearance perspective view of the heat radiator of another shape. It is typical sectional drawing of the heat radiator by the XXVII-XXVII line of FIG. It is an external appearance perspective view of the heat radiator of another shape. It is an external appearance perspective view of a rectifying cap. It is an example of application of a rectifying cap.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments and reference embodiments thereof.
(Reference form 1)
FIG. 1 is an external perspective view of a lighting device according to Reference Embodiment 1. FIG. 2 is a schematic side view of the lighting device, FIG. 3 is a schematic rear view of the lighting device, and FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 3.

  In the figure, reference numeral 1 denotes a heat radiator made of metal such as aluminum, and the heat radiator 1 has a so-called bullet-shaped outer shape in which one side in the axial direction of a cylinder is reduced in diameter.

  The radiator 1 has a disk-shaped heat transfer plate 11, and a cylindrical inner cylinder 12 is concentric with the heat transfer plate 11 on one surface 11 a of the heat transfer plate 11. . The wall thickness of the inner cylinder 12 is continuously changed in the axial direction, and is formed so that the heat transfer plate 11 side is thick and the open end side is thin.

  On the outer surface 12a of the inner cylinder 12, a plurality of first fins 13, 13,... Constituting the heat radiating portion are equally distributed in the circumferential direction, and project in the radial direction over substantially the entire length of the inner cylinder 12. is there. In the middle of the inner cylinder 12, a cylindrical outer cylinder 14 is provided coaxially with the inner cylinder 12 so as to surround the inner cylinder 12, and the first fins 13, 13,. The outer cylinder 14 is connected. A plurality of ventilation paths 15, 15... Extending in the axial length direction of the inner cylinder 12 are formed by the inner cylinder 12, the outer cylinder 14, and the first fins 13, 13.. The first fins 13, 13... Have their projecting heights continuously changed from one end of the outer cylinder 14 toward the open end of the inner cylinder 12 as shown in the figure.

  On the outer surface 14a of the outer cylinder 14, a plurality of second fins 16, 16,... Constituting the heat radiating portion are equally distributed in the circumferential direction, and project in the radial direction over substantially the entire length of the outer cylinder 14. is there. The plurality of second fins 16, 16... Have their projecting heights continuously changed from one side (the heat transfer plate 11 side) to the other side in the axial direction of the outer cylinder 14.

  In this way, the height of the first fin 13 and the second fin 16 from the heat transfer plate 11 is continuously increased toward the center of the radiator 1, so that the outer shape of the radiator 1 is increased. Is a bullet shape continuously reduced in diameter from the heat transfer plate 11 side in the axial direction of the inner cylinder 12 toward the open end side.

  Further, on the inner surface 12b of the inner cylinder 12, a plurality of third fins 17, 17... Constituting the heat radiating portion are equally distributed in the circumferential direction, and project in the radial direction over substantially the entire length of the inner cylinder 12. It is. The plurality of third fins 17, 17... Are formed so that the projecting ends of the third fins 17, 17. The spacing between the projecting ends of the third fins 17 is preferably about 4 cm. Note that the optimum value of the facing distance varies depending on the size of the radiator 1, the amount of heat of the heating element, and the like. The thicknesses of the plurality of first fins 13, 13, 16, 16, 17, 17, are continuously changed in the axial direction, the heat transfer plate 11 side is thick, and the open end The side is formed so as to be thin.

  On the other surface 11 b of the heat transfer plate 11 of the radiator 1, a plurality (six in the figure) of LED modules 2, 2... Are equally distributed in the circumferential direction at radial positions corresponding to the inner cylinder 12. Installed. Therefore, the heat from the LED 2 is easily transferred to the inner cylinder 12 and heat dissipation is improved. Further, the LED modules 2, 2... Have a rectangular ceramic substrate (Al2 O3), a plurality of (for example, 36) LED elements densely mounted on the central portion of one surface of the ceramic substrate, The LED element is sealed, and includes a sealing resin in which a phosphor is dispersed, and input and output terminals. It is desirable to interpose a heat conductive sheet or grease between the LED modules 2, 2... And the heat transfer plate 11.

  A peripheral wall 11 c is erected on the periphery of the other surface 11 b of the heat transfer plate 11. On the other surface 11 b side of the heat transfer plate 11, a substantially disc-shaped reflecting plate 3 is provided. The reflector 3 is formed with a plurality of reflectors 31, 31... At positions corresponding to the LED modules 2 when the reflector 3 is attached to the radiator 1. The reflecting portions 31, 31... Project in a direction orthogonal to the one surface 3 a of the reflecting plate 3, and have a hole portion 31 a having a hole diameter substantially the same as the light emitting surface of the LED module 2, 2. A diameter-enlarged portion 31b having an inner diameter continuously increased from one end 3a of the reflecting plate 3 toward one surface 3a in the thickness direction of the reflector 3 toward the other surface 3b. The reflector 3 is a metal such as stainless steel, a metal coated with a highly reflective paint, or an ultrafine foamed light reflecting material having optical characteristics of high total reflectance (about 98%) and high diffuse reflectance (about 95%). It is made of a material (for example, MCPET (registered trademark)).

  A peripheral wall 32 is erected on the peripheral edge of the one surface 3a of the reflecting plate 3. The reflecting plate 3 makes the end surface of the peripheral wall 32 abut on the end surface of the peripheral wall 11c of the heat transfer plate 11 and radiates heat by screws or the like. It is fixed to the vessel 1.

  The light from the LED modules 2, 2... Is reflected by the reflecting portions 31, 31... Of the reflection plate 3 formed in this way, and the angle formed with the optical axis of the LED modules 2, 2. In other words, light having a light distribution characteristic controlled to increase the illuminance directly below the lighting device is emitted from the lighting device.

  A cylindrical frame 4 is fitted on the heat transfer plate 11 and the reflection plate 3 of the radiator 1. A disk-shaped resin cover 5 is attached to the inner surface of the frame 4 so as to cover the light emitting surfaces of the LED modules 2, 2. The cover 5 is made of polycarbonate resin, for example.

  The illuminating device configured as described above is used, for example, as a spotlight by being fixed to the ceiling via a fixture with the cover 5 facing downward. Note that a power supply unit (not shown) including various circuit components such as a transformer, a resistor, and a capacitor is provided outside the lighting device.

  In this lighting device, the heat generated in the LED modules 2, 2... When the LED modules 2 are turned on is transmitted to the inner cylinder 12 via the heat transfer plate 11. The heat transmitted to the inner cylinder 12 is conducted from the inner cylinder 12 to the outer cylinder 14 via the first fins 13, 13..., And from the outer surface 14 a of the outer cylinder 14 and the surfaces of the second fins 16, 16. In addition to being transmitted to the outside air, it is also transmitted to the air inside the ventilation paths 15, 15... Formed by the inner cylinder 12, the outer cylinder 14 and the first fins 13, 13. As indicated by the white arrows in the figure, the air in the air passages 15, 15... Is warmed by the transmitted heat and flows out from above the air passages 15, 15. External air flows from below 15, 15. The air in the ventilation passages 15, 15... Has a high temperature on the lower side where the LED modules 2, 2. The flow rate increases due to the chimney effect based on. Since the boundary layer is thinned by increasing the flow velocity, and the amount of air passing at the same time increases, the surface of the inner cylinder 12, the outer cylinder 14 and the first fins 13, 13 forming the ventilation paths 15, 15. Heat can be efficiently transferred to the air whose flow rate has been increased, and heat dissipation can be improved without increasing the external dimensions of the radiator 1.

  That is, since the external air flows in from the lower side and flows out from the upper side, the ventilation path 15 becomes a medium path through which the air as the heat exchanger passes. Further, since the medium passage has a structure that allows the flow rate of the heat exchange medium to be increased as described above, the medium passage is heated to a place where air does not easily flow between adjacent fins or the base of the fin. An exchange medium can be supplied, and as a result, the area of the part which contributes to the heat radiation in the radiator is increased. Therefore, even when the spacing between the fins is reduced by increasing the number of fins or by reducing the radiator, it is possible to improve heat dissipation.

  In particular, the root of the first fin 13 is the place closest to the LED module 2 that is a heating element, and by spreading the heat exchange medium over the entire surface to the root of the first fin 13, the heat dissipation is further improved. It can be improved effectively.

  In addition, since the second fins 16, 16... Project from the outer surface 14 a of the outer cylinder 14 of the radiator 1, they contact the air that is the heat exchange medium by the surface area of the second fins 16, 16. The heat radiation area that can be increased can be increased, and the heat radiation performance can be improved. Further, the third fins 17, 17... Are projected from the inner surface 12 a of the inner cylinder 12 of the radiator 1 so that the projecting ends of the third fins 17, 17. The warm air in the vicinity of the third fins 17, 17... Flows out to the outside, while the air as the heat exchange medium flows into the space between the projecting ends of the third fins 17, 17. The open thermosyphon phenomenon can be promoted, heat can be efficiently transferred from the surface of the third fins 17, 17... To the air, and heat dissipation can be improved.

  Further, the radiator 1 is formed so as to have a so-called bullet-shaped outer shape in which one side in the axial direction of the cylinder is reduced in diameter, and the LED modules 2, 2. Since it is installed on the other side (the side of the heat transfer plate 11), the outer dimensions of the radiator 1 can be kept small while ensuring a sufficient heat radiation area of the portion that becomes high temperature. Since the protruding heights of the first fins 13, 13,..., 16, 16... Are continuously changed, the first fins 13, 13,. It is possible to prevent the worker from being injured when the end portion of the arm hits a part of the body such as the hand of the worker, and it is possible to prevent the member from being touched and damaged.

  Moreover, since the ventilation path 15,15 ... is formed in equal distribution in the circumferential direction of the heat radiator 1, in an illuminating device whose irradiation direction is variable like a spotlight, at least the ventilation path 15,15 ... Since air flows in and out partly, heat from the LED modules 2, 2... Is efficiently transferred from the surfaces of the inner cylinder 12, the outer cylinder 14, and the first fins 13, 13,. It is possible to improve heat dissipation.

  Further, the thickness of the inner cylinder 12, outer cylinder 14 and first fins 13, 13... Of the radiator 1 is continuously changed in the axial length direction so that the temperature near the LED modules 2, 2. Since the side of the heat plate 11 is thick and the side of the open end where the temperature is relatively low is made thin, the heat transferred from the LED modules 2 to the heat transfer plate 11 is connected to the heat transfer plate 11. The inside of the inner cylinder 12, the outer cylinder 14, and the first fins 13, 13,... Can be smoothly conducted from the high temperature side to the low temperature side, heat dissipation can be improved, and the radiator 1 can be downsized. And can be reduced in weight. At the same time, it also acts as a draft when die-casting, improving productivity.

  Furthermore, the material of the radiator is not limited to aluminum, and may be a metal other than aluminum. Moreover, even if it is resin with good heat dissipation, it is applicable. Furthermore, it is preferable that the surface of the radiator is painted. By painting, heat radiation is improved by radiant heat transfer, and corrosion is prevented, so that the reliability of the radiator can be improved. Note that radiant heat transfer is proportional to the emissivity of the heat radiating surface and may be equal to or greater than convective heat transfer depending on conditions. In general, the emissivity of a metal surface is said to be 0.1 to 0.4, and can be increased to about 0.9 by painting. In addition, as for the coating of a radiator, the electrodeposition coating etc. which reach to a deep part are preferable, and an alumite process is preferable.

  In addition, although the example which applied the illuminating device which concerns on the reference form 1 to the spotlight was described, it is applicable also to a downlight. When applied to a downlight, the lighting device is fixed to a mounting hole provided in the ceiling with, for example, a leaf spring with the cover 5 facing downward. In the illuminating device provided such that the longitudinal direction of the ventilation passages 15, 15, and the like is in the vertical direction like a downlight, air flows into and out of all the ventilation passages 15, 15, and the inner cylinder 12, the outer cylinder 14 and Since the heat from the LED modules 2, 2... Is efficiently transferred from the surface of the first fins 13, 13... To the air with an increased flow velocity, the heat dissipation can be further improved.

(Reference form 2)
FIG. 5 is an external perspective view of the lighting device according to Reference Embodiment 2. At the end portion of the inner cylinder 12 of the radiator 1a on the side where the LED modules 2, 2,... Are installed, rectangular vents 12c, 12c,. ... in between. Since other configurations are the same as those of the first embodiment shown in FIG. 1, the same reference numerals as those in FIG. 1 are given to corresponding components, and detailed description of the configurations is omitted.

  By configuring the radiator 1a in this way, the heat generated in the LED modules 2, 2... Along with the lighting of the LED modules 2, 2... Is transmitted to the inner cylinder 12, and the air inside the inner cylinder 12 is transferred. As shown by arrows in the drawing, the warmed and warmed air flows out from the open end of the inner cylinder 12 to the outside, and from the vents 12c, 12c... Provided at the end of the inner cylinder 12. External air flows in. As a result, heat from the LED modules 2, 2... Is efficiently transmitted to the air, which is a heat exchange medium whose flow rate is increased by the chimney effect of the medium passage inside the inner cylinder 12, so that heat dissipation is further improved. Can do. The dimensions and number of the vents 12c, 12c... Are appropriately set so as not to disturb the heat conduction inside the inner cylinder 12.

(Reference form 3)
FIG. 6 is a schematic partial cross-sectional view of the illumination device according to Reference Embodiment 3. A turbulence promoting body 11d is formed on the peripheral edge of the one surface 11a of the heat transfer plate 11 of the radiator 1b so as to protrude from the inner cylinder 11 over the entire circumference. The height H of the turbulent flow promoting body 11d is desirably determined so that the relationship between the distance L between the turbulent flow promoting body 11d and the inner cylinder 12 satisfies a predetermined condition (L≈10H). Since the other configuration is the same as that of the first embodiment shown in FIG. 4, the same reference numerals as those in FIG. 4 are given to the corresponding structural members, and the detailed description of the configuration is omitted.

  By configuring the radiator 1b in this manner, the air flowing into the ventilation passages 15, 15... Is disturbed by the turbulence promoting body 11d to generate vortices, and as indicated by arrows in the figure, By flowing into the vicinity of the boundary between the tube 12 and the heat transfer plate 11, the retention of air is alleviated, so that heat from the LED modules 2, 2. Heat can be quickly transferred to the air, and heat dissipation can be improved. In other words, the turbulent flow promoting body 11d forms a medium passage through which a heat exchange medium such as air is distributed to the portion closest to the LED module 2 that is a heating element.

  The projecting height of the first fins 13, 13... Is substantially the same as that of the outer cylinder 14 between the heat transfer plate 11 and the outer cylinder 14, but the second fins 16, 16. It is more desirable to make it approximately the same as the protruding height.

  When the relationship between the turbulent flow promoting body 11d and the distance L between the inner cylinder 12 satisfies a predetermined condition (L≈10H), the heat exchange medium is supplied to the portion closest to the LED module 2 that is a heating element. However, even if the above relationship is not satisfied, the heat dissipation is improved by the turbulence promoting body.

  The radiator may be formed by die casting, or may be formed by extrusion or cutting.

(Embodiment 1)
In the above reference embodiments 1 to 3, the power supply unit is installed outside the lighting device. From the viewpoint of reducing the size of the lighting device, it is more preferable to install the power supply unit inside the radiator of the lighting device. desirable. FIG. 7 is an external perspective view of the lighting apparatus according to Embodiment 1. FIG. 8 is a schematic side view of the lighting device, FIG. 9 is a schematic rear view of the lighting device, and FIG. 10 is a longitudinal sectional perspective view of the lighting device.

  In the figure, 1c is a radiator made of metal such as aluminum, and the radiator 1c has a cylindrical outer shape. The radiator 1 c has a disk-shaped heat transfer plate 11, and a cylindrical heat radiating cylinder 18 is concentrically fitted to the heat transfer plate 11 on the side of one surface 11 a of the heat transfer plate 11. It is.

  As shown in FIG. 9, the outer surface 18 a of the radiating cylinder 18 has a plurality of axially cross-sectional shapes that extend in the radial direction and are continuously bent in the circumferential direction from the inner side to the outer side in the radial direction. The fins 19, 19... Are formed over the substantially entire length in the axial length direction of the heat radiating cylinder 18 at equal intervals in the circumferential direction.

  A plurality (six in the figure) of LED modules 2, 2... Are attached to the other surface 11b of the heat transfer plate 11 of the radiator 1c at equal intervals in the circumferential direction. On the other surface 11 b of the heat transfer plate 11, a substantially disc-shaped reflecting plate 3 is provided. A plurality of reflecting portions 31, 31... Are formed on the reflecting plate 3 at positions corresponding to the LED modules 2, 2... When the reflecting plate 3 is attached to the radiator 1c. Since the LED modules 2, 2... And the reflector 3 are the same as those in the first embodiment, detailed description thereof is omitted.

  Further, a peripheral wall 32 is erected on the peripheral edge of the one surface 3 a of the reflector plate 3, and the reflector plate 3 abuts the end face of the peripheral wall 32 with the peripheral edge of the heat transfer plate 11 and the end face of the radiator tube 18. Etc. are fixed to the radiator 1c.

  The light from the LED modules 2, 2... Is reflected by the reflecting portions 31, 31... Of the reflection plate 3 formed in this way, and the angle formed with the optical axis of the LED modules 2, 2. In other words, light having a high directivity is emitted from the lighting device.

  A frame 41 is provided on the heat transfer plate 11 side of the radiator 1c. The frame 41 includes an annular portion 41a, a cylindrical outer peripheral wall 41b erected on the outer peripheral edge of the annular portion 41a, and a substantially cylindrical inner portion erected on the inner peripheral edge side of the annular portion 41a. And a peripheral wall 41c. Between the outer peripheral wall 41b and the inner peripheral wall 41c of the annular portion 41a, a plurality of (eight in the drawing) slits 41d, 41d,... Are formed in the circumferential direction. The frame 41 is externally fitted to the reflecting plate 3 with an inner peripheral wall 41c, and the inner surface of the annular portion 41a of the frame 41 is disc-shaped so as to cover the light emitting surfaces of the LED modules 2, 2. The resin cover 5 is attached. The cover 5 is made of polycarbonate resin, for example. As shown in FIG. 9, the slits 41d, 41d,... Are formed so as to pass through substantially the center in the radial direction of the fins 19, 19 ... when the frame 41 is attached to the radiator 1c. Function as.

  A power supply unit 6 is provided inside the radiating cylinder 18. The power supply unit 6 includes two partial power supply units 61 and 62. The partial power supply units 61 and 62 include a full-wave rectification unit that rectifies an alternating current into a direct current, and forward currents of the LED modules 2, 2,. Are arranged in a distributed manner, and various circuit components constituting a control unit for controlling lighting of the LED modules 2, 2.

  The substrate 60 on which the power supply unit 6 is mounted is attached to a mounting plate 7 having a rectangular flat plate 71 and a peripheral wall 72 extending in a direction orthogonal to the periphery of the flat plate 71. A resin 8 is filled between the substrate 60 and the mounting plate 7. The resin 8 is a heat-resistant resin having good heat transfer performance and elasticity, for example, a silicone adhesive containing a filler. The mounting plate 7 is in contact with the inner surface 18 b of the heat radiating cylinder 18 and the one surface 11 a of the heat transfer plate 11 at the peripheral wall 72. As a result, the heat generated by the power supply unit 6 is transmitted to the mounting plate 7 through the resin 8, is transmitted from the mounting plate 7 to the heat radiating cylinder 18, and is transmitted to external air as will be described later. As a result, the temperature rise of the power supply unit 6 can be suppressed, and problems caused by the temperature rise can be prevented.

  A cover 9 having a circular plate 91 and a cylinder 92 standing on the periphery of the circular plate 91 is attached to the open end of the heat radiating cylinder 18 on the opposite side of the heat transfer plate 11. Thereby, the space inside the heat radiating cylinder 18 is sealed. Connection terminals 93 and 93 are provided on the outer surface of the disc 91. The connection terminals 93 and 93 are connected to the power supply unit 6 via lead wires (not shown).

  The lighting device configured as described above is fixed to a mounting hole provided in the ceiling with, for example, a leaf spring, with the cover 5 facing downward.

  In the lighting device configured as described above, the heat generated in the LED modules 2, 2... When the LED modules 2 are turned on is transmitted to the heat radiating cylinder 18 through the heat transfer plate 11. . The heat transmitted to the heat radiating cylinder 18 is conducted from the heat radiating cylinder 18 to the fins 19, 19..., And is transmitted to the air from the surfaces of the heat radiating cylinder 18 and the fins 19, 19. The air in the ventilation paths 15a, 15a ... surrounded by the heat radiating cylinder 18 and the fins 19, 19 ... is warmed by the transmitted heat and flows out from the upper side of the ventilation paths 15a, 15a ... of the lighting device. The outside air flows into the ventilation paths 15a, 15a, ... through the gaps between the slits 41d, 41d, ... and the fins 19, 19, .... The air in the ventilation passages 15a, 15a ... has a high flow rate on the lower side to which the LED modules 2, 2 ..., which are heating elements, are attached, and the upper side has a low temperature. It is possible to efficiently transfer heat from the surfaces of the radiating cylinder 18 and the fins 19, 19, which form 15 a, 15 a... To the air with an increased flow velocity, and without increasing the external dimensions of the radiator 1 c Can be improved. Moreover, since the power supply part 6 is accommodated in the heat radiator 1c, a lighting device can be reduced in size.

  Further, since the heat radiation area of the fins 19, 19... Provided in the heat radiation cylinder 18 of the radiator 1 c is increased by the amount bent in the circumferential direction, the heat radiation performance can be improved.

  That is, air that is a heat exchange medium that passes through the ventilation path 15a serving as a medium passage dissipates the heat transferred from the heating element by the heat radiating fins. However, the heat exchange medium can be formed by using involute fins. This increases the area in contact with the heat radiating portion and spreads the heat exchange medium over the entire surface, thereby realizing more effective heat dissipation.

  In the present embodiment, the fins 19, 19,... Are formed so that the axial cross-sectional shape is involute. However, the fins 19, 19 are not limited to involute, and the interval between the fins 19, 19,. It suffices if it is formed to be bent in the circumferential direction while being held substantially the same.

(Embodiment 2)
In the first embodiment, the axial section is formed by extending radially from the outer surface 18a of the radiator cylinder 18 to the radiator cylinder 18 of the radiator 1c and continuously bending from the inner side to the outer side in the radial direction. The fins 19 are formed in a so-called involute shape, but the fins may be formed in other shapes. FIG. 11 is a diagram schematically showing fins having other shapes.

  The radiator cylinder 18 of the radiator 1d shown in FIG. 11 is provided with rectangular plate-like fins 19a, 19a... Projecting radially from the outer surface 18a of the radiator cylinder 18 over substantially the entire length of the radiator cylinder 18. Other configurations are the same as those of the lighting device described in Embodiment 1, and thus the drawings and description thereof are omitted.

  By configuring the radiator 1d in this way, the heat radiation area is increased by the amount of the fins 19a, 19a.

(Embodiment 3)
FIG. 12 is a diagram schematically showing fins having other shapes. The heat radiating cylinder 18 of the radiator 1e has a T-shaped axial cross-sectional shape extending radially from the outer surface 18a of the heat radiating cylinder 18 and projecting from the extended end to both sides in the substantially circumferential direction of the outer cylinder. The fins 19b, 19b,... Are equally distributed in the circumferential direction and are formed over substantially the entire length of the heat radiating cylinder 18 in the axial direction. Other configurations are the same as those of the lighting device described in Embodiment 1, and thus the drawings and description thereof are omitted.

  By configuring the heat radiator 1e in this manner, the heat radiation area of the fins 19b, 19b... Provided in the heat radiation cylinder 18 of the heat radiator 1e is increased by the amount projecting on both sides in the circumferential direction. In addition, the axial cross-sectional shape of fin 19b, 19b ... is not restricted to T shape shown in FIG. 12, For example, Y shape may be sufficient.

(Embodiment 4)
FIG. 13 is a diagram schematically showing fins having other shapes. A plurality of rectangular fins 19c, 19c,... Are spirally formed in the heat radiating cylinder 18 of the heat radiator 1f. Other configurations are the same as those of the lighting device described in Embodiment 1, and thus the drawings and description thereof are omitted.

  By configuring the radiator 1f in this way, even when the radiator 1f is mounted so that the axial length direction of the radiator 1f substantially coincides with the horizontal direction, the fins 19c, 19c. Since air flows along, heat dissipation can be kept good.

  Also in the lighting devices according to the first to fourth embodiments, the thickness of the heat radiating cylinder 18 and the fins of the radiator are continuously changed in the axial direction, resulting in a high temperature in the vicinity of the LED modules 2, 2. It is desirable to form the radiator so that the heat transfer plate 11 side is thick and the open end side where the temperature is relatively low is thin. Thereby, the heat transferred from the LED modules 2, 2... To the heat transfer plate 11 can be conducted smoothly from the high temperature side to the low temperature side through the heat radiating cylinder 18 and the fins connected to the heat transfer plate 11. In addition, the heat dissipation can be improved, and the radiator can be reduced in size and weight.

  Similarly to the radiator of the first embodiment, the radiators of the second to fourth embodiments also increase the area where the fins are in contact with air, which is a heat exchange medium that passes through the medium passage between the fins. The heat dissipation can be improved.

(Embodiment 5)
In the illuminating device configured to accommodate the power supply unit 6 inside the radiator cylinder 18 of the radiator, as in the illuminating device according to the first to fourth embodiments, the power supply unit is required to ensure the performance of the power supply unit 6. It is necessary to radiate the heat generated by the power supply unit 6 to the outside so that the temperature of 6 becomes a certain value or less. FIG. 14 is a diagram schematically showing the heat transfer structure of the power supply unit 6. In this figure, the case where it applies to the illuminating device which concerns on Embodiment 2 is demonstrated to an example.

  Inside the heat radiating cylinder 18 of the radiator 1g, a rectangular metal heat transfer plate 7a that is slightly larger than the substrate on which the power supply unit 6 is mounted is provided. The heat transfer plate 7 a is connected to the inner surface 18 b of the heat radiating cylinder 18 at two opposing edges in parallel with the axis of the heat radiating cylinder 18. The power supply unit 6 is provided so as to be opposed to the heat transfer plate 7a. The power supply unit 6 and the heat transfer plate 7a may be brought as close as possible from the viewpoint of heat transfer while ensuring a safe distance so that no discharge occurs from the circuit components constituting the power supply unit 6 to the heat transfer plate 7a. Desirably, for example, 5 mm apart. Since other configurations are the same as those of the second embodiment shown in FIG. 11, the same reference numerals as those in FIG. 11 are given to corresponding components, and detailed description thereof is omitted.

  In the lighting device configured as described above, the heat generated by the power supply unit 6 is transmitted to the heat transfer plate 7a provided close to the power supply unit 6 via air as a heat exchange medium, and the heat transfer plate 7a. Then, it is transmitted to the outside air through the heat radiating cylinder 18. As a result, the temperature rise of the power supply unit 6 can be suppressed, and problems caused by the temperature rise can be prevented.

(Embodiment 6)
FIG. 15 is a diagram schematically showing another heat transfer structure of the power supply unit. Also in this figure, the case where it applies to the illuminating device which concerns on Embodiment 2 is demonstrated to an example.

  Inside the heat radiating cylinder 18 of the radiator 1h, a rectangular plate 71b that is slightly larger than the substrate on which the power supply unit 6 is mounted, and side walls 72b and 72b that are erected at the ends of two opposing sides of the rectangular plate 71b are provided. A metal heat transfer plate 7b is provided. In the heat transfer plate 7b, the rectangular plate 71b is parallel to the axis of the heat radiating cylinder 18, and as shown in the drawing, the inner surface of the heat radiating cylinder 18 is formed at the opposite edges of the rectangular plate 71b and the side walls 72b and 72b. 18b is provided continuously. The power supply unit 6 is provided so as to be opposed to the rectangular plate 71b and the side walls 72b and 72b of the heat transfer plate 7b. A resin 8 is filled between the power supply unit 6 and the heat transfer plate 7b. The resin 8 is a heat-resistant resin having good heat transfer performance and elasticity, and is, for example, a silicone adhesive containing a filler. Since other configurations are the same as those of the second embodiment shown in FIG. 11, the same reference numerals as those in FIG. 11 are given to corresponding components, and detailed description thereof is omitted.

  In the lighting device configured as described above, the heat generated by the power supply unit 6 is transmitted to the heat transfer plate 7b through the resin 8, and is radiated from the heat transfer plate 7b to the outside air through the heat radiating cylinder 18. It will be. As a result, by interposing the resin 8 instead of the air layer in the gap, the thermal resistance can be reduced, the temperature rise of the power supply unit 6 can be further suppressed, and problems caused by the temperature rise can be prevented. .

  In addition, the heat radiator which concerns on the above Embodiments 1-6 may be formed by die-casting, and may be formed by an extrusion process or a cutting process. Forming the radiator body other than the heat transfer plate by extrusion and brazing or welding the heat sink body and the heat transfer plate is more effective from the viewpoint of optimization and manufacturability of the heat dissipation design of the radiator. desirable.

(Embodiment 7)
In the above embodiment, the radiator includes a heat transfer plate, a cylinder erected on the heat transfer plate, and a plurality of fins radially provided in a direction crossing the cylinder. Instead of this, it is conceivable to use a radiator having another shape according to the type of the lighting device and the installation location. FIG. 16 is an external perspective view of the radiator 1i, and FIG. 17 is a schematic cross-sectional view of an illumination device including the radiator 1i. In addition, the heat radiator 1i shown in FIG. 17 has shown sectional drawing by the XVII-XVII line of FIG.

  The radiator 1i has a disk-shaped heat transfer plate 11, and a plurality of rectangular plate-shaped (four in the figure) heat sinks 21, 21,. It is standing. On one surface 11 a of the heat transfer plate 11, a connecting plate 22 is erected so as to pass through substantially the center of the plurality of heat radiation plates 21, 21.

  A plurality of LED modules 2, 2... Are attached to the other surface 11 b of the heat transfer plate 11. On the other surface 11 b of the heat transfer plate 11, a substantially disc-shaped reflecting plate 3 is provided. In the reflecting plate 3, a plurality of reflecting portions 31, 31... Are formed at positions corresponding to the LED modules 2, 2... When the reflecting plate 3 is attached to the radiator 1i. Since the LED modules 2, 2... And the reflector 3 are the same as those in the first embodiment, detailed description thereof is omitted.

  A frame 42 is provided on the heat transfer plate 11 side of the radiator 1i. The frame 42 includes an annular portion 42a and a cylindrical peripheral wall 42b erected on the inner peripheral edge portion of the annular portion 42a. In this frame 42, a peripheral wall 42b is externally fitted to the reflecting plate 3, and a disc-shaped resin is formed on the inner surface of the annular portion 42a of the frame 42 so as to cover the light emitting surfaces of the LED modules 2, 2. A cover 5 made of metal is attached. The cover 5 is made of polycarbonate resin, for example.

  The lighting device configured as described above is fixed to a mounting hole provided in the ceiling 100 with, for example, a plurality of leaf springs with the cover 5 facing downward, and is used as a so-called downlight. The leaf springs are appropriately arranged so as to uniformly support the load of the downlight. In case of light weight, two leaf springs are sufficient. However, if the weight exceeds 1 kg, two leaf springs may damage the ceiling mounting hole. Suitable to do. A power supply unit (not shown) is provided outside the lighting device.

  In the lighting device configured as described above, the heat generated in the LED modules 2, 2... With the lighting of the LED modules 2, 2,. It is transmitted to the connecting plate 22. The air in the vicinity of the heat radiating plates 21, 21... And the connecting plate 22 is heated by the transmitted heat and flows upward along the heat radiating plates 21, 21. On the other hand, external air flows from the heat sinks 21, 21... And the lower end side of the connecting plate 22 as a heat exchange medium. Therefore, a medium passage is formed by the heat transfer plate 11, the heat radiating plate 21, and the connecting plate 22. In the absence of the connecting plate 22, the low-temperature air flowing in from both sides convects due to conduction heat transfer from the heat transfer plate 11 and the heat radiating plate 21, and stands up upward while causing collision and vortex generation between the fins. Going up. On the other hand, when the connecting plate 22 is present, the surface of the connecting plate is also a heat radiating surface, so that an airflow rising along this surface is generated. Will be rectified and promoted. Therefore, by configuring the heat radiator 1i in this way, it is possible to secure a heat radiation area and improve heat radiation without increasing the outer dimensions of the heat radiator 1i. Further, the connecting plate 22 also functions as a reinforcement for adjacent fins. In particular, in the case of die casting, warpage occurring after mold release can be reduced.

  In the present embodiment, the connecting plate 22 is provided so as to pass through substantially the center of the plurality of heat radiation plates 21, 21..., So as to avoid the central portion of the heat transfer plate 11 as shown in FIG. The connecting plate 22 a may be formed, and a wiring through hole 11 e may be provided in the center of the heat transfer plate 11. In the illuminating device in which a plurality of LED modules 2, 2... Are arranged in the circumferential direction of the heat transfer plate 11, by providing a through-hole 11e for wiring at the center of the heat transfer plate 11, the LED modules 2, 2,. Wiring is easy.

(Embodiment 8)
FIG. 19 is an external perspective view of a heat radiator 1k having another shape, and FIG. 20 is a diagram schematically showing a positional relationship between the heat radiator 1k and the power supply unit 6.

  The radiator 1k has a disk-shaped heat transfer plate 11, and a plurality of rectangular plate-shaped (four in the figure) heat sinks 21, 21, ... are parallel to one surface 11a of the heat transfer plate 11. It is standing. On one surface 11a of the heat transfer plate 11, a connection plate 23 that connects the plurality of heat radiation plates 21, 21,... Is erected, and the connection plate 23 is located on the peripheral side from the center of the heat transfer plate 11. It is provided so as to be orthogonal to the plurality of heat sinks 21, 21. As shown in FIG. 20, a part of the power source 6 is provided on the open end side of the radiator 1k at a position facing the radiator 1k. Other configurations are the same as those of the lighting device described in Embodiment 7, and thus the drawings and description thereof are omitted.

  In the lighting device configured as described above, the heat generated in the LED module as the LED module is turned on is transmitted to the heat radiating plates 21, 21... And the connecting plate 23 through the heat transfer plate 11. The air in the vicinity of the heat sinks 21, 21... And the connecting plate 23 is warmed by the transmitted heat and flows upward along the heat sinks 21, 21. On the other hand, external air flows from the heat sinks 21, 21... By configuring the heat radiator 1k in this way, it is possible to secure a heat radiation area and improve heat radiation without increasing the outer dimensions of the heat radiator 1k.

  Since the power supply unit 6 is provided so that a part thereof is opposed to the radiator 1k, the outer dimension in the radial direction of the lighting device can be reduced, and the lighting device can be reduced in size. Further, when the warmed air rises along the heat radiation plates 21, 21,... And the connection plate 23, the power supply unit 6 is provided at a position away from the vicinity of the connection plate 23 through which the main flow of the upward flow passes. The influence of heat on the circuit components constituting the power supply unit 6 can be reduced.

  Further, since the connecting plate 23 is provided on the peripheral side from the central portion of the heat transfer plate 11, a through hole for wiring can be provided in the central portion of the heat transfer plate 11, and the LED modules 2, 2,. Wiring is easy.

(Embodiment 9)
FIG. 21 is an external perspective view of a heat radiator 1m having another shape, and FIG. 22 is a diagram schematically showing the positional relationship between the heat radiator 1m and the power supply unit 6. FIG.

  The heat radiator 1m has a disk-shaped heat transfer plate 11, and a plurality of rectangular plate-shaped (four in the figure) heat dissipation plates 24, 24,. It is standing. In the corners opposite to the heat transfer plates 11, notches 24 a, 24 a... Are formed. These notches 24a, 24a, ... form a substantially rectangular parallelepiped space on one side of the open side of the radiator 1m.

  Further, on one surface 11 a of the heat transfer plate 11, a connection plate 23 that connects the plurality of heat dissipation plates 24, 24... Is erected on the peripheral side from the center of the heat transfer plate 11. Are provided so as to be orthogonal to the side opposite to the side where the cutouts 24a, 24a, ... are formed. As shown in FIG. 22, the power supply unit 6 is provided such that a part of the power supply unit 6 is located in a space formed by the notches 24a, 24a. Further, the power supply unit 6 is provided with a radiator cover 65 so as to face the radiator 1m at an appropriate distance and cover the open end side of the radiator 1m. Thereby, when the power supply part 6 is provided in the notch 24a of the heat radiator 1m, dust can be prevented from entering the heat radiator 1m (between the fins). The radiator cover 65 is preferably provided so as to have a gap of several centimeters from the radiator 1 m even when the power supply unit 6 is attached to the radiator 1 m. With the configuration described above, dust can be prevented from entering the heat radiator 1m, and since the air flow rising from the heat radiator 1m is not blocked, the heat dissipation can be maintained. Other configurations are the same as those of the lighting device described in Embodiment 7, and thus the drawings and description thereof are omitted.

  In the lighting device configured as described above, the heat generated in the LED module as the LED module is turned on is transmitted to the heat radiating plates 24, 24... And the connecting plate 23 through the heat transfer plate 11. The air in the vicinity of the radiator plates 24, 24... And the connecting plate 23 is warmed by the transmitted heat and flows upward along the radiator plates 24, 24. On the other hand, outside air flows from the heat sinks 24, 24. By configuring the heat radiator 1m in this way, it is possible to secure a heat radiation area and improve heat radiation without increasing the external dimensions of the heat radiator 1m. Moreover, since the power supply part 6 is provided so that a part of the power supply part 6 may be located in the space formed by the notches 24a, 24a ... of the radiator 1m, the lighting device can be further downsized.

(Embodiment 10)
FIG. 23 is an external perspective view of a radiator 1n having another shape.

  The radiator 1n has a disk-shaped heat transfer plate 11, and a plurality of rectangular plate-shaped (four in the figure) heat sinks 21, 21, ... are parallel to one surface 11a of the heat transfer plate 11. It is standing. On one surface 11 a of the heat transfer plate 11, a connecting plate 22 is erected so as to pass through substantially the center of the plurality of heat radiation plates 21, 21. A heat radiating cylinder 25 is provided concentrically with the heat transfer plate 11 so as to surround the heat radiating plates 21, 21... And the connecting plate 22. The heat radiating cylinder 25 is a cylinder having substantially the same diameter as the heat transfer plate 11 and is spaced apart from the heat transfer plate 11 by an appropriate length. With this configuration, vent holes 25a, 25a,... Through which external air flows are formed between the heat transfer plate 11 and the heat radiating cylinder 25. Other configurations are the same as those of the lighting device described in Embodiment 7, and thus the drawings and description thereof are omitted.

  In the lighting device configured as described above, the heat generated in the LED module as the LED module is turned on is transmitted to the heat radiating plates 21, 21... .. Are transmitted from the plates 21, 21... To the radiating cylinder 25 and transmitted from the surface of the radiating cylinder 25 to the outside air, and the ventilation path 25 b formed by the radiating plates 21, 21. , 25b... As indicated by arrows in the figure, the air in the ventilation paths 25 b, 25 b... Is warmed by the transmitted heat, and the ventilation paths along the heat radiation plates 21, 21. While flowing out from above 25b, 25b..., Air as an external heat exchange medium flows in from the vents 25a, 25a.

  By configuring the radiator 1n in this manner, the heat radiation area can be increased without increasing the external dimensions of the radiator 1n, and the heat transferred from the LED module is a ventilation path 25b which is a medium path. , 25b..., 25b..., 25,..., 25b..., 25b. The heat dissipation can be improved without doing so.

  The heat radiation cylinder 25 increases the area in which air, which is a heat exchange medium passing through the medium passage, comes into contact with the radiator, so that it is possible to improve heat dissipation.

(Embodiment 11)
FIG. 24 is an external perspective view of another shape of the heat radiator 1p, and FIG. 25 is a schematic cross-sectional view of the heat radiator 1p along the line XXV-XXV in FIG.

  The radiator 1p has a disk-shaped heat transfer plate 11, and a plurality of rectangular plate-shaped (four in the figure) heat sinks 21, 21, ... are parallel to one surface 11a of the heat transfer plate 11. It is standing. On one surface 11 a of the heat transfer plate 11, a connecting plate 22 is erected so as to pass through substantially the center of the plurality of heat radiation plates 21, 21. A turbulent flow promoting body 11f is formed on the peripheral edge of the one surface 11a of the heat transfer plate 11 so as to protrude from the connection plate 22 over substantially the entire circumference. The height H of the turbulent flow promoting body 11f is preferably determined so that the relationship between the turbulent flow promoting body 11f and the distance L between the connecting plate 22 satisfies a predetermined condition (L≈10H). Other configurations are the same as those of the lighting device described in Embodiment 7, and thus the drawings and description thereof are omitted.

  By configuring the radiator 1p in this way, the air flowing into the radiator 1p is disturbed by the turbulence promoting body 11f to generate vortices, and as shown by arrows in the drawing, Since it flows in the vicinity of the boundary with the heat transfer plate 11, heat from the LED module is transmitted and heat can be quickly transferred to the air flowing in from the boundary that becomes high temperature, and heat dissipation is improved. Can do.

(Embodiment 12)
26 is an external perspective view of another shape of the heat radiator 1q, and FIG. 27 is a schematic cross-sectional view of the heat radiator 1q along the line XXVII-XXVII in FIG.

  The radiator 1q includes a disk-shaped heat transfer plate 111, and a plurality of rectangular plate-shaped (four in the figure) heat sinks 21, 21, ... are parallel to one surface 111a of the heat transfer plate 111. It is standing. On one surface 111a of the heat transfer plate 111, a connecting plate 22 is erected so as to pass through substantially the center of the plurality of heat radiating plates 21, 21,... One surface 111a of the heat transfer plate 111 is formed on a slope inclined upward from the peripheral edge of the heat transfer plate 111 toward the connecting plate 22, as shown in the figure. Other configurations are the same as those of the lighting device described in Embodiment 7, and thus the drawings and description thereof are omitted.

  By configuring the radiator 1q in this way, the air flowing into the radiator 1q is connected to the connecting plate 22 along the inclined surface (one surface 111a) of the heat transfer plate 11 as shown by arrows in the figure. Since it flows in the vicinity of the boundary with the heat transfer plate 111, heat from the LED module is transmitted and heat can be quickly transferred to the air flowing in from the boundary that becomes high temperature, and heat dissipation is improved. Can do.

  As another shape of the radiator, as shown in FIG. 28, the boundary 112 between the heat transfer plate 111 and the connecting plate 22 and / or the boundary between the heat transfer plate 111 and the heat dissipation plate 21 may be formed in an R shape. By making the boundary part into an R shape, it is possible to supply a heat exchange medium to a place where the air flow is slow and the air stays in the vicinity of the boundary part, as in the case of the inclined surface described above, thereby improving heat dissipation. Can do.

  Note that the radiators according to the seventh to twelfth embodiments may be formed by die casting, or may be formed by extrusion or cutting. Forming the radiator body other than the heat transfer plate by extrusion and brazing or welding the heat sink body and the heat transfer plate is more effective from the viewpoint of optimization and manufacturability of the heat dissipation design of the radiator. desirable. If there is a margin in heat dissipation performance, it is possible to just screw the flat surfaces together.

  Also in the lighting devices according to the seventh to twelfth embodiments, the thickness of the heat radiating plate and the connecting plate of the radiator is thicker on the side of the heat transfer plate 11 that is close to the LED modules 2, 2. It is desirable to form the radiator so that the open end side becomes thin.

  Further, in the radiators shown in the seventh, eighth, ninth, eleventh and twelfth embodiments, in order to further improve the heat dissipation, a resin rectifying cap having a bottomed cylindrical shape is covered from above the radiator. It is conceivable to configure. FIG. 29 is an external perspective view of the rectifying cap.

  The rectifying cap 97 includes a disc 95 having a circular opening 95 a and a cylinder 96 erected on the periphery of the disc 95. A plurality of rectangular vents 96 a, 96 a... Are formed on the circular plate 95 side of the cylinder 96. FIG. 30 shows an application example of the rectifying cap 97, and shows an example in which the rectifying cap 97 is applied to the radiator 1i according to the seventh embodiment.

  As shown in FIG. 30, the rectifying cap 97 is formed so that the open end of the cylinder 96 is separated from the heat transfer plate 11 of the radiator 1i by an appropriate length when the rectifier cap 97 is put on the radiator 1i. In the illuminating device configured as described above, a ventilation path is formed by the radiator plates 21, 21...

  In the lighting device configured as described above, the heat generated in the LED modules 2, 2... With the lighting of the LED modules 2, 2,. It is transmitted to the connecting plate 22. The air in the vicinity of the heat sinks 21, 21... And the connecting plate 22 is warmed by the heat transmitted from the LED modules 2, 2... As indicated by arrows in FIG. ... and the connecting plate 22 mainly flow upward from the opening 95a of the rectifying cap 97, while outside air flows into the ventilation path from the gap between the rectifying cap 97 and the heat transfer plate 11.

  The air in the ventilation path has a high temperature on the lower side where the LED modules 2, 2..., Which are heating elements are mounted, and a low temperature on the upper side. Heat can be efficiently transferred from the surfaces of the heat sinks 21, 21,... And the connecting plate 22 formed to the air whose flow rate is increased, and heat dissipation is improved without increasing the external dimensions of the heat radiator 1 i. Can do.

  In addition, since the end portions of the heat sinks 21, 21... And the connecting plate 22 are covered with the rectifying cap 97, the worker who performs the assembling work of the lighting device contacts the heat sinks 21, 21. It is possible to prevent the building material from being injured and the heat sinks 21, 21...

  Further, since the plurality of vent holes 96a, 96a,... Are formed in the cylinder 96 of the rectifying cap 97 at equal intervals in the circumferential direction, the opening 95a of the rectifying cap 97 has a heat insulating material as shown in FIG. Even when covered with 110, at least some of the vents 96 a, 96 a... Of the rectifying cap 97 are not covered with the heat insulating material 110, so that ventilation can be secured, and the heat sinks 21, 21. The air heated by heat transfer from the surface 22 can flow out from the vents 96a, 96a.

  In the eleventh embodiment, the turbulence promoting body is formed so as to have a cylindrical shape by projecting over the entire periphery of the heat transfer plate, but is not limited thereto. A plurality of protrusions may be formed on the peripheral edge of the plate at an appropriate distance in the circumferential direction.

  In the above embodiment, the radiator is formed so as to have a bullet-shaped or columnar outer shape, but is not limited thereto, and may be formed so as to have a polygonal column outer shape, for example. . Moreover, in the above embodiment, although the heat radiator also serves as the support member of the light source, the support member may be provided separately.

  In the above embodiment, the LED modules 2, 2... On which a plurality of LED elements are mounted are used as a light source. However, the present invention is not limited to this, and a plurality of LED elements, other types of LEDs, etc. May be used.

  Further, in the above embodiment, an example in which a radiator having improved heat dissipation is applied to an illumination device having a narrow irradiation range such as a spotlight or a downlight has been described. However, the present invention is not limited to other types of illumination. Needless to say, the present invention can be applied to the apparatus, and can be implemented in variously modified forms within the scope of the matters described in the claims.

1c, 1f Radiator 2 LED module (light source)
6 Power supply unit 11 Heat transfer plate 18 Radiating cylinder 19, 19c Fin 15a Ventilation path (medium path)
41 frame 41d slit

Claims (3)

An LED light source;
A power supply for supplying current to the LED light source;
In the lighting device including the power supply unit therein and a heat radiating unit that radiates heat from the LED light source,
The heat dissipating part includes a plurality of heat dissipating fins,
The plurality of heat radiating fins have a spiral shape, form a ventilation path through which air passes from one end of the lighting device body to which the LED light source is attached to the other end , and from the one end toward the other end. lighting device comprising the formed tear Rukoto as the thickness becomes thinner Te. A frame is provided at the one end of the heat dissipating part,
The lighting device according to claim 1, wherein the frame has a slit that leads to the ventilation path. The heat dissipating part includes a heat transfer plate having the LED light source attached to one surface thereof, and a heat dissipating tube provided on the other surface of the heat transfer plate,
3. The lighting device according to claim 1, wherein the heat radiating tube houses the power supply unit therein, and has a plurality of heat radiating fins protruding from an outer surface thereof.

Images