JP2011192557A - Led lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED lighting device which can dissipate heat in the vicinity of a base and is independent of the size of a partial fixture. <P>SOLUTION: An LED lighting device 1 which can be an alternative for a dichroic halogen lamp includes a base 5 attached to a lighting appliance, an insulation portion 4 incorporating a power supply portion 3 which converts AC power supply to DC power supply, an LED module 24 which emits light by electric power converted through the power supply portion 3, and a mirror 21 which is opened in a tapered shape at the outer peripheral part of the LED module 24. The insulation portion 4 provided at the outer periphery of the power supply portion 3 is constituted of a metal member, and an insulation film such as a fluororesin film is formed at the metal member on the side of the power supply portion 3, and a radial fin 43f is provided at the outer peripheral part of the metal member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an illumination device that uses an LED as a light source, and more particularly to an LED illumination device that can be used as a substitute for a conventional dichroic halogen.

  Conventionally, dichroic halogen has been used as a relatively small illumination device. This dichroic halogen has a base that can be attached to a lamp, and is provided with a halogen lamp, a tapered mirror, etc. on the light source side through an insulating part on the upper part, and is used in downlights, spot lighting devices, etc. It is often done. At present, comparatively small types such as E11 (diameter 11 mm) and E17 (diameter 17 mm) are widely used as such dichroic halogens, and a tapered widened tip side is also used as a mirror. Those having a diameter of 35 mm, 50 mm, and 70 mm are widespread.

  By the way, such dichroic halogen has a very high illuminance, but has a drawback that the light source portion is very hot and has a short service life. Therefore, an attempt has been made to use an LED illumination device in place of such dichroic halogen.

  For example, as shown in FIG. 5, the following Patent Document 1 and Patent Document 2 include a base 61, a support 63 provided via an insulating portion 62, and an LED 64 provided on the support 63. An LED illumination device is disclosed in which radial fins 63f are provided around the support 63 to diffuse the heat from the LEDs 64. If such an illuminating device is used, the heat radiated from the LED 64 can be diffused to the outside, so that there is an advantage that the lifetime of the semiconductor element can be extended and the illuminance of the LED 64 can be increased.

  In addition to such a patent document, as shown in FIG. 6, as shown in FIG. 6, a radial metal fin 72 is provided outside the tapered mirror 71, thereby diffusing the heat radiated from the LED. Many devices are sold.

JP 2009-21264 A JP 2009-170114 A

  However, when such an LED lighting device is used, the following problems occur.

  First, in general, when an LED is used as a light source, the illuminance decreases, and therefore, an LED with a high wattage must be provided. However, when such an LED element with a high wattage is used, high heat is emitted at that portion, and in a structure in which fins are provided only on a tapered mirror or support as in the prior art, the LED or There is a problem that heat is trapped in the power supply part.

  In addition, in the conventional LED lighting device, a power source part for converting AC power to DC is provided inside the insulating part, but this insulating part is made of a material having low heat conductivity such as plastic or ceramic. Because it is configured, heat is trapped in that part. However, since the power supply portion is provided with semiconductor elements such as transistors and IC chips, the heat shortens the life of the semiconductor elements and other electronic components.

  Furthermore, if the fin is provided on the outer peripheral portion, there is a problem that when the fin is enlarged, the size of the lamp for embedding the lighting device is not suitable, and the lighting device cannot be attached. .

  Therefore, the present invention has been made paying attention to the above-mentioned problem, and provides an LED lighting device that can dissipate heat even near the base and does not depend on the inner dimensions of the lamp. With the goal.

  That is, the LED lighting device of the present invention includes a base attached to a lamp, an insulating part including a power source unit that converts an AC power source into a DC power source, an LED that emits light by a power source converted through the power source unit, In the LED lighting device comprising a mirror that opens in a tapered shape at the outer peripheral portion of the LED, the insulating portion provided on the outer periphery of the power supply unit is configured with a metal member, and on the power supply unit side of the metal member An insulating film is formed, and radial fins are provided on the outer peripheral portion of the metal member.

  If comprised in this way, the heat conductivity in an insulating part can be ensured, and since it has provided the fin in the outer peripheral part, it will become possible to radiate | emit heat also from the nozzle | cap | die vicinity.

  In such an invention, the fin is provided so as to be attachable to the insulating portion.

  In this way, even if the internal size of the lamp of the downlight or the spot lighting device is small, a fin having a length suitable for the size can be selected, attached to the insulating portion, and fitted into the lamp. .

  Furthermore, as such a fin, it can also be comprised with a flexible metal member.

  In this way, even if the gap between the vicinity of the base and the lamp is small, the flexible fin can be bent and attached to the lamp, and the size of the fin is limited. It becomes possible to attach it to various lamps without it. Here, as the flexible fin, a very thin metal film, a linear metal body, or the like can be used.

  According to the present invention, a base attached to a lamp, an insulating part including a power supply unit that converts an AC power source into a DC power source, an LED that emits light by the power source converted through the power source unit, and an outer periphery of the LED In an LED lighting device comprising a mirror that opens in a tapered shape at a part, an insulating part provided on the outer periphery of the power supply part is made of a metal member, and an insulating film is formed on the power supply part side of the metal member In addition, since the radial fins are provided on the outer peripheral portion of the metal member, the heat conductivity in the insulating portion can be secured, and the fins are provided on the outer peripheral portion. Can also radiate heat.

Schematic of the LED lighting device in one embodiment of the present invention 1 is a cross-sectional view of the insulating portion and the fin in FIG. The perspective view which shows the structure of the fin attached to the insulation part in the same form The figure which shows the fin in other embodiment The figure which shows the LED lighting apparatus in a prior art example The figure which shows the LED lighting apparatus in a prior art example

  Hereinafter, LED lighting device 1 according to an embodiment of the present invention will be described with reference to the drawings. The LED lighting device 1 in this embodiment has a size and a shape that can be used in place of the dichroic halogen. A portion 4 and a base 5 provided below the insulating portion 4. Characteristically, the insulating portion 4 is made of a metal material, the inside thereof is insulated with a fluororesin or the like, and the second heat radiating portion 42 having the fins 23f is provided outside the insulating portion 4, thereby The heat of the LED is radiated from the insulating part 4 having high thermal conductivity through the second heat radiating part 42 having the fins 42f, thereby increasing the output wattage of the LED and extending the life of the semiconductor element. I can do it. Hereinafter, the LED lighting device 1 in the first embodiment will be described in detail.

  First, as shown in FIG. 1, the light emitting unit 2 constituting the LED lighting device 1 is provided with an LED module 24 having a plurality of LEDs inside a mirror 21 that opens in a tapered shape, and in front of the LED module 24. A transparent front part 22 is provided. The mirror 21 is made of aluminum having high thermal conductivity, and the front surface of the mirror 21 is covered with a transparent front portion 22 to protect the LED module 24 that generates heat, and dust or the like does not enter the portion of the LED module 24. I have to. The LED module 24 is provided with a plurality of LED elements in the vicinity of the focal point of the tapered mirror 21. For example, red, green, and blue LEDs can be provided to realize white, A color close to white can be realized by covering the LED with a yellow film or paint. Here, when this LED illumination device 1 is used as a substitute for dichroic halogen, the output wattage of dichroic halogen is normally 60 W to 100 W, and therefore, it is necessary to use an LED that outputs a corresponding amount of light. As an LED having such a light quantity, for example, assuming that it corresponds to dichroic halogen 60W, it is necessary to use an LED corresponding to 7W to 14W. However, when such an LED is used, the element portion is expensive. Heat may be output and the semiconductor element may be broken. For this reason, the 1st heat radiating part 23 which has the fin 23f in the outer peripheral part of the mirror 21 is provided as a 1st heat radiating means. The first heat radiating portion 23 is configured by linear fins, meandering fins, spiral fins, and the like, thereby increasing the surface area and enhancing the heat radiation effect.

  Below such LED module 24, a power supply unit 3 having a mounting substrate for converting AC power into DC power is provided. The power supply unit 3 is constituted by a circuit board on which a capacitor, a transistor, an IC chip, and the like are mounted, and supplies power input from the household power supply via the base 5 to the LED. The power supply unit 3 is attached with a predetermined gap so as not to be short-circuited inside the insulating unit 4, and the insulating unit 4 currently distributed in the market is made of heat-resistant plastic or ceramic. ing. However, since such heat-resistant plastics and ceramics have extremely low thermal conductivity, the heat from the LED module 24 is confined inside the insulating portion 4. For this reason, even if the heat of the LED module 24 is released by the first heat dissipating part 23, the heat inside the insulating part 4 cannot be dissipated, and the lifetime of the transistor, IC chip, etc. is shortened. Therefore, in this embodiment, the insulating portion 4 is made of a metallic material having high thermal conductivity, and the insulating film 41 is provided on the inner side, that is, on the surface on the side where the power source portion 3 is provided. ing. As such an insulating film 41, it is preferable to use a film that has heat resistance and can be reliably insulated. Here, the insulating film 41 made of a fluororesin is provided. By providing such an insulating film 41 made of a fluororesin, it is possible to ensure insulation without causing deformation even at high temperatures (for example, 260 ° C.), and ensure high insulation performance similar to that of conventional ceramics. can do. Note that the fluororesin has a lower thermal conductivity than aluminum or the like, but if the film thickness is made very thin, the low thermal conductivity can be ignored as in a cooking utensil or the like. The film thickness is preferably about a few microns in consideration of thermal conductivity and insulation.

  On the other hand, a second heat radiating portion 42 having fins 42f is provided on the outer peripheral portion of the insulating portion 4. The second heat radiating portion 42 is configured by providing a metal plate radially like the first heat radiating portion 23, and diffuses the heat of the power source 3 and the heat transmitted from the LED module 24 to the outside. Play a role. The second heat radiating portion 42 in the insulating portion 4 is very close to the mounting portion for mounting the LED lighting device 1, so that there is a possibility that the shape does not match the shape of the embedded portion of the downlight or spot illumination. For this reason, as shown in FIG. 3, the second heat radiating portion 42 is provided with an independent second heat radiating portion 42 so as to be separable from the insulating portion 4, and a plurality of second heat radiating portions having different fin 23f lengths. A portion 42 may be prepared, and the second heat radiating portion 42 that matches the shape of the embedded portion may be appropriately attached and used. However, when such a second heat radiating portion 42 is used, the insulating portion 4 and the second heat radiating portion 42 are brought into close contact so that heat conduction can be ensured.

  In addition, the second heat radiating portion 42 may be configured using a fin 43f having flexibility as shown in FIG. The fin 43f shown in FIG. 4 secures a large surface area by attaching a linear metal material to the insulating portion 4, and deflects the linear metal material when the attachment portion to the lamp is very narrow. It is designed to fit within the gap of the mounting part. In addition, although FIG. 4 demonstrates the case where the fin 43f which has linear flexibility is used, you may make it use flexible fins, such as aluminum foil.

  On the other hand, the base 5 is attached to a lamp (not shown) and has the same dimensions and shape as the standard dimensions of dichroic halogen. As standards currently distributed in the market, for example, those having dimensions such as E11, E17, and E26 are used.

  Next, the heat radiation effect in the case of using the LED lighting device 1 configured as described above will be described.

  First, when the LED lighting device 1 is attached to a lamp and the power is turned on, the power input through the base 5 is supplied to the power supply unit 3, where it is converted into a DC power supply and supplied to the LED module 24. Then, the LED emits light, and at that time, high heat is output from the power supply unit 3 and the LED module 24. Among these, the heat output from the LED module 24 is diffused by the first heat radiating portion 23 via the mirror 21, thereby reducing the heat of the LED module 24.

  On the other hand, the heat generated from the back surface of the LED module 24 and the power supply unit 3 is transmitted to the insulating unit 4 formed of a metal member, and is diffused therefrom by the second heat radiating unit 42 having the fins 43f. At this time, since the inside of the insulating portion 4 is insulated by the insulating film 41 made of fluororesin, it is possible to prevent leakage from the power source portion 3 without causing deformation even by high heat. Further, heat is transmitted to the base 5 through the insulating portion 4 made of this metal member, and the heat is diffused also on the lamp side, thereby releasing the heat of the electronic components and the LED module 24 in the power source portion 3. can do.

  As described above, according to the above-described embodiment, the base 5 attached to the lamp, the insulating unit 4 including the power source unit 3 that converts the AC power source into the DC power source, and the power source converted through the power source unit 3 are used. In the LED lighting device 1 including the LED that emits light and the mirror 21 that opens in a tapered shape at the outer peripheral portion of the LED, the insulating portion 4 provided on the outer periphery of the power source portion 3 is made of a metal member, Since an insulating film is formed on the power supply unit 3 side of the metal member and the radial fins 43f are provided on the outer peripheral portion of the metal member, the thermal conductivity in the insulating unit 4 can be ensured. Moreover, since the fins 43f are provided on the outer peripheral portion, heat is also radiated from the base 5 if the insulating portion between the lowermost end portion and the side surface of the base 5 is also made of an insulated metal member. Will be able to.

  In addition, since the fins 43f in the second heat dissipating part 42 are provided so as to be attachable to the insulating part 4, even if the dimensions of the downlight and the lamp of the spot lighting device are small, the dimensions thereof A suitable fin 43f can be selected and attached to the insulating portion 4 to be fitted into the lamp.

  Furthermore, as shown in FIG. 4, since the fins 43f made of a flexible metal member are used, even when the gap between the vicinity of the base 5 and the lamp is small, the flexibility of the fins 43f is used. The fin 43f can be bent and attached to the lamp, and the fin 43f can be attached to various lamps without being limited to the size of the fin 43f. Here, as the flexible fin 43f, a very thin metal film, a linear metal body, or the like can be used.

  In addition, this invention is not limited to the said embodiment, It can implement in a various aspect.

  For example, in the above embodiment, the first heat radiating portion 23 having the fins 23f is provided on the mirror 21. However, when the heat radiating effect can be obtained only by the second heat radiating portion 42, only the second heat radiating portion 42 is provided. May be provided.

  In the above embodiment, the fins 42f of the second heat radiating portion 42 are made of a metal member having high thermal conductivity. The fins 42f of the second heat radiating portion 42 are portions close to the power source of the lamp. Therefore, the fins 42f may be similarly coated with a fluorine resin or may be formed of an insulating material.

DESCRIPTION OF SYMBOLS 1 ... LED illumination apparatus 2 ... Light emission part 21 ... Mirror 22 ... Front part 23 ... 1st thermal radiation part 23f ... Fin 24 ... LED module 3 ... Power supply part 4 ... Insulating part 41 ... Insulating film 42 ... Second heat radiating part 42f ... Fin 43f ... Linear fin 5 ... Base

Claims (3)

A base attached to the lamp, an insulating part including a power supply part for converting an AC power source into a DC power source, an LED that emits light by the power source converted through the power source part, and a tapered opening at an outer peripheral part of the LED In an LED lighting device comprising a mirror that
The insulating part provided on the outer periphery of the power supply part is made of a metal member, an insulating film is formed on the power supply part side of the metal member, and radial fins are provided on the outer peripheral part of the metal member. LED lighting device characterized by the above. The LED lighting device according to claim 1, wherein the fin is provided so as to be attachable to the insulating portion. The LED lighting device according to claim 1, wherein the fin is made of a flexible metal member.

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