JP2012079565A - Led lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device capable of improving heat radiation by raising thermal conductivity and thermal diffusion.SOLUTION: In the LED lighting device 1, an LED light source case 3 for supporting an LED light source 2 is mounted on a device base 6 via a support tool 4; and the LED light source 2, the LED light source case 3 and the support tool 4, together with the device base 6, are covered with a device cover 7. A support tool base 5 is arranged between the support tool 4 and the device base 6, the support tool 4 is fixed to the surface of the support tool base 5 in a surface contact state, and the device base 6 is fixed to the rear surface of the support tool base 5 in a surface contact state.

Description

  The present invention relates to an LED lighting device that uses an LED (light emitting diode) as a light source.

  Since LEDs have features such as high brightness, power saving, and long service life, in recent years, LED lighting devices using LEDs as light sources have been used for general lighting as well as street lights and road lights. (See, for example, Patent Document 1).

  Here, an example of a conventional LED lighting device is shown in a side cross-sectional view of FIG. 7. In the illustrated LED lighting device 101, the LED light source 102 places the base 110 on the base socket 112 erected on the instrument base 106. The LED light source 102 is covered with a transparent device cover 107 having a spherical shell shape.

  The LED light source 102 includes an LED cover 108 on which an LED 109 as a light source is mounted in an instrument cover 107, and an LED light source housing 103 that supports the LED substrate 108. The LED light source housing 103 includes a plurality of radiating fins 103a. Is provided.

  In such an LED lighting device 101, the heat generated by the light emission of the LED 109 is transferred by heat conduction from the LED 109 to the heat radiation fin 103a of the LED light source housing 103, as indicated by the arrow in FIG. The heat radiating fin 103a is transmitted to the internal air in the instrument cover 107 by natural convection and radiation. The heat transmitted to the internal air in the instrument cover 107 is transmitted to the external air outside the instrument cover 107 by natural convection and radiation through the instrument cover 107.

  However, in the LED lighting device 101 in which heat is transmitted through the above-described path, the heat dissipation efficiency is remarkably deteriorated because the heat is dissipated from the radiating fins 103a to the sealed internal air, and the LED 109 is sufficiently cooled. Therefore, there is a problem that the life and deterioration of the LED 109 are accelerated.

  Further, the LED illumination device 101 shown in FIG. 7 is heavy and large because the LED light source housing 103 is provided with the large heat radiation fins 103a. For this reason, when the LED lighting device 101 is used with the LED lighting device 101 facing downward, loosening occurs between the base 110 and the base socket 112 of the LED light source 102 due to vibration or the like, resulting in poor electrical contact, and the lighting is turned off. In the worst case, the LED light source 102 may come off and fall.

  Therefore, an LED lighting device 201 as shown in FIG. 8 has been proposed.

  That is, FIG. 8 is a side sectional view of a conventional LED lighting device 201. The illustrated LED lighting device 201 includes an LED light source housing 203 that supports the LED light source 202 via a support 204 that is a heat radiation improving component. In addition to being attached to the base 206, the LED light source 202, the LED light source casing 203, and the support 204 are covered with a spherical shell-shaped transparent instrument cover 207 together with the instrument base 206. Here, the LED light source casing 203, the support 204, and the instrument base 206 are made of a material having high thermal conductivity such as aluminum.

  In such an LED lighting device 201, the heat generated by the LED light source 202 is transmitted from the LED light source 202 through the LED light source casing 203 and the support 204, as indicated by an arrow in FIG. To the outside air by natural convection and radiation from the outer surface of the instrument base 206. Since such a heat transfer path does not include heat dissipation to the internal air having a low heat transfer coefficient, a higher heat dissipation effect than that of the LED lighting device 101 shown in FIG. 7 can be obtained.

JP 2006-156187 A

  By the way, in the LED lighting device 201 shown in FIG. 8, the heat generated in the LED light source 202 is transmitted through a heat radiation path of the LED light source 202 → the LED light source housing 203 → the support 204 → the instrument base 206 → external air. However, in this heat radiation path, heat must be transmitted without heat conduction loss.

  However, since an actual product uses an existing product as the instrument base 206, the surface to which the support 204 of the instrument base 206 is attached has a complicated shape, and the support 204 is attached to the instrument base 206. In the state, the contact area (heat transfer area) between the two becomes small. For this reason, the heat transfer from the support 204 to the instrument base 206 is not efficiently performed, and the heat flow is concentrated at the contact point, and the thickness of the instrument base 206 is as thin as several millimeters. There is a problem that heat diffusion becomes insufficient, and the heat radiation effective area is reduced when heat is radiated from the instrument base 206 to the outside air, and the heat radiation efficiency is deteriorated.

  This invention is made | formed in view of the said problem, The process made into the objective is providing the LED illuminating device which can aim at the improvement of heat dissipation by improving thermal conductivity and thermal diffusivity.

  In order to achieve the above object, the invention according to claim 1 is characterized in that an LED light source casing that supports an LED light source is attached to an instrument base through a support, and the LED light source, the LED light source casing, and the support are mounted. In the LED lighting apparatus configured to be covered with an instrument cover together with the instrument base, a support base is interposed between the support and the instrument base, and the support is in surface contact with the surface of the support base. The instrument base is fixed in contact with the back surface of the support base.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the support, the instrument base, and the support base are made of a material having high thermal conductivity.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a plurality of heat radiation fins are formed on the back surface of the support base.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the support and the support base are screwed to the instrument base.

  The invention according to claim 5 is the invention according to any one of claims 1 to 3, wherein the support and the support base are configured integrally.

  According to the first aspect of the present invention, the support tool base is interposed between the support tool and the instrument base, and the support tool base, the support tool, and the tool base are fixed in surface contact. In addition, the contact area (heat transfer area) with the tool base is increased, and heat from the LED light source is efficiently conducted and diffused from the support tool to the tool base through the support tool base, and finally from the outer surface of the tool base. It is transmitted to the outside air by natural convection and radiation. For this reason, thermal conductivity and thermal diffusivity are improved, heat dissipation is improved, and temperature rise of the LED light source is suppressed.

  According to the invention described in claim 2, since the support tool, the instrument base, and the support tool base are made of a material having high thermal conductivity, heat from the LED light source efficiently passes through the support tool and the support tool base to the instrument base. Conducted and finally transmitted from the outer surface of the instrument base to the external air by natural convection and radiation, so that the heat dissipation of the LED lighting device is further effectively improved and the LED light source is efficiently cooled.

  According to the invention described in claim 3, since the plurality of radiating fins are formed on the back surface of the support base, cooling of the LED light source is promoted by radiating heat from the radiating fins to the internal air, and the radiating fins face the fixture base. Since the heat transfer area is expanded by the contact, the thermal conductivity and diffusibility of the LED lighting device are further enhanced, and the heat dissipation is further improved.

  According to the fourth aspect of the present invention, since the support and the support base are screw-fixed to the instrument base, the fixing is not loosened by vibration or the like, and the LED light source housing attached to the support and the support Occurrence of the problem that the LED light source is removed and dropped is prevented.

  According to the fifth aspect of the present invention, since the support tool and the support tool base are integrated, the contact thermal resistance between the support tool and the support tool base is eliminated, and the thermal conductivity is further improved.

It is a sectional side view of the LED lighting apparatus which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the LED illuminating device principal part which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the LED illuminating device principal part which concerns on Embodiment 1 of this invention. (A), (b) is a perspective view which shows the contact part to the support tool of the support tool base of the LED illuminating device which concerns on Embodiment 1 of this invention, and an instrument base. It is a perspective view of the support base of the LED lighting apparatus which concerns on Embodiment 1 of this invention. It is a sectional side view of the LED lighting apparatus which concerns on Embodiment 2 of this invention. It is side sectional drawing of the conventional LED lighting apparatus. It is side sectional drawing of the conventional LED lighting apparatus.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

<Embodiment 1>
1 is a side sectional view of an LED lighting apparatus according to Embodiment 1 of the present invention, FIGS. 2 and 3 are exploded perspective views of the main part of the LED lighting apparatus, and FIGS. 4A and 4B are LED lightings. It is a perspective view which shows the support part of the support tool base of an apparatus, and the contact part to an instrument base.

  The LED lighting device 1 according to the present embodiment attaches the LED light source housing 3 that supports the LED light source 2 to the fixture base 6 via the support tool 4 and the support tool base 5 that are heat dissipation improving components, and the LED light source 2. The LED light source housing 3, the support 4, and the support base 5 are covered with a spherical shell-like transparent instrument cover 7 together with the instrument base 6.

  As shown in FIGS. 2 and 3, a plurality of LED light sources 2 are provided on each of four LED substrates 8 attached to the four surfaces of a quadrangular columnar support 3A provided in the LED light source housing 3 (see FIG. 2). It is configured by mounting 12 LEDs 9 in the illustrated example. A power supply base 10 is attached to the center of the lower surface of the LED light source housing 3. The LED light source housing 3 is made of a material having high thermal conductivity such as aluminum.

  The support 4 is formed in a tapered cylindrical shape whose diameter is expanded downward by a metal having high thermal conductivity such as aluminum, and the four circular holes 11 are the same in the flange 4A formed at the peripheral edge of the lower end. It is formed on the circumference at an equiangular pitch (90 ° pitch).

  By the way, in this embodiment, as the appliance base 6, an existing one (not a special product specially designed for the LED lighting device 1 according to the present invention) is used, which has a high thermal conductivity. It is integrally formed in a substantially circular dish shape by aluminum die casting or the like, and a cylindrical passage boss 6A is integrally projected downward from the center of the lower surface.

  In addition, a base socket 12 is attached to the center of the upper surface of the instrument base 6 by a gate-shaped support stay 13, and flat mounting seats 6 a are arranged at equiangular pitches (90 °) at four locations on the outer periphery of the upper surface of the instrument base 6. The screw holes 14 are respectively formed in the mounting seats 6a. Further, a total of four mounting seats 6b are integrally formed on the inner diameter side portion of the upper surface of the instrument base 6 where the mounting seat 6a is provided, and are formed at the center of the flat mounting surface of each mounting seat 6b. Screw holes 15 are respectively formed.

  The support base 5 is formed in a substantially annular shape by an aluminum die cast or the like having a high thermal conductivity, and the mounting seat 6b formed on the instrument base 6 is fitted into four places on the outer periphery thereof. A notch 5a is formed. In addition, concave mounting seats 5c are formed at two opposing positions on the inner periphery of the circular hole 5b formed in the center of the support base 5, and circular holes 16 are formed in each mounting seat 5c. Has been.

  Further, a total of eight circular holes 17 are formed at an equiangular pitch (45 ° pitch) on the same circumference of the outer peripheral portion of the support base 5, and as shown in FIG. A plurality (12 in the illustrated example) of triangular rib-shaped heat radiation fins 18 are radially and integrally formed on the lower surface (back surface).

  Thus, when the LED lighting device 1 according to the present embodiment is assembled, the support base 5 is placed on the instrument base 6, and four notches 5 a formed on the outer periphery thereof are formed in the instrument base 6. The support base 5 is positioned by being fitted into the four mounting seats 6b. When the support base 5 is thus placed and positioned on the instrument base 6, the circular hole 17 formed in the support base 5 and the circular hole 16 formed in the mounting seat 5 c are formed on the instrument base 6. The screw holes 14 and 15 formed in the mounting seats 6a and 6b respectively match. Further, at this time, the ring-shaped portion hatched in FIG. 4B on the outer periphery of the lower surface (back surface) of the support base 5 and the lower surfaces of the plurality of radiating fins 18 (surfaces hatched in FIG. 4B). ) And the lower surfaces of the two mounting seats 5c (the surfaces hatched in FIG. 4B) are in surface contact with the upper surface of the instrument base 6. The two mounting seats 5c formed on the support base 5 The support base 5 is fixed to the instrument base 6 by screwing a screw (not shown) inserted through the formed circular hole 16 from above into a screw hole 15 formed in the mounting seat 6 b of the instrument base 6.

  From the above state, the support 4 is put on the support base 5 and the instrument base 6, and the four circular holes 11 formed in the flange 4 </ b> A at the peripheral edge of the lower end thereof are formed with the circular holes 17 formed in the support base 5 and the instrument base. In accordance with the screw holes 14 formed in the six mounting seats 6a, screws (not shown) inserted through the circular holes 11 and 17 from above are screwed into the screw holes 14 formed in the four mounting seats 6a of the instrument base 6, respectively. Thus, the support 4 is fixed to the instrument base 6. At this time, the ring-shaped portion indicated by hatching in FIG. 4A on the outer periphery of the upper surface (front surface) of the support tool base 5 comes into surface contact with the lower surface of the flange 4 </ b> A of the support tool 4.

  When the support tool base 5 and the support tool 4 are attached to the tool base 6 with screws as described above, the LED light source housing 3 that supports the LED light source 2 is inserted into the support tool 4 from above, and at the lower end thereof. The LED light source housing 3 is attached to the device base 6 together with the LED light source 2 by screwing the provided base 10 into a base socket 12 supported on the device base 6. Finally, the LED lighting device 1 is assembled by covering the LED light source housing 3 supporting the LED light source 2, the support 4, and the support base 5 together with the instrument base 6 with the instrument cover 7.

  Thus, in the LED lighting device 1 according to the present embodiment, when current is supplied to each LED 9 of the LED light source 2 from a commercial power source (not shown), each LED 9 is activated to emit light, and the light is transparent. The light passes through the instrument cover 7 and is emitted toward the periphery. At this time, the LED light source 2 generates heat by the light emission of each LED 9, but the heat is transferred from the LED light source housing 3 to the instrument base 6 through the support 4 and the support base 5 as indicated by arrows in FIG. And is transmitted from the outer surface of the instrument base 6 to the external air by natural convection and radiation.

  By the way, in the present embodiment, an existing instrument base 6 is used, but a support base 5 is interposed between the instrument base 6 and the support 4, and the skirt base 5 and the skirt 4 and Since the fixture base 6 is fixed in surface contact, the contact area (heat transfer area) between the support fixture base 5, the support fixture 4 and the fixture base 6 is increased, and the heat from the LED light source 2 is transferred from the support fixture 4 to the support fixture base. 5 is efficiently conducted and diffused to the instrument base 6 through 5 and finally transmitted from the outer surface of the instrument base 6 to the external air by natural convection and radiation. For this reason, the thermal conductivity and thermal diffusibility of the LED lighting device 1 are enhanced, the heat dissipation is improved, and the temperature rise of the LED light source 2 is suppressed.

  In this embodiment, since the support 4, the instrument base 6, and the support base 5 are made of a material having high thermal conductivity, heat from the LED light source 3 passes through the support 4 and the support base 5, and the instrument base. 6 is efficiently conducted to the outside air from the outer surface of the instrument base 6 to the outside air by natural convection and radiation, so that the heat dissipation of the LED lighting device 1 is further effectively improved and the LED light source 2 is more efficient. Cools well.

  Moreover, in this Embodiment, since the several heat sink 18 was formed in the lower surface (back surface) of the support base 5, cooling of the LED light source 2 is accelerated | stimulated by the heat radiation from this heat sink 18 to internal air, and also heat radiation. When the fin 18 is in surface contact with the instrument base 6, the heat transfer area between the two is expanded, so that the thermal conductivity and the diffusibility are further improved, and the heat dissipation is further improved.

  Furthermore, in this embodiment, since the support 4 and the support base 5 are fixed to the instrument base 6 with screws, the fixing does not loosen due to vibration or the like, an electrical contact failure occurs, and the illumination is turned off. In addition, even when the LED lighting device 1 is mounted downward (in a state where the top and bottom are reversed in FIG. 1), the LED light source 2 comes off and falls. There is no problem that it will end up. In addition, the attachment direction of the LED lighting apparatus 1 is arbitrary.

  By the way, in this Embodiment, although the several heat radiating fin 18 was formed in the bottom face (back surface) of the support tool base 5, as shown in FIG. For example, since almost the entire bottom surface (back surface) of the support base 5 can be brought into surface contact with the instrument base 6, the amount of heat transferred from the support base 5 to the instrument base 6 is increased, and the heat dissipation is further enhanced.

<Embodiment 2>
Next, a second embodiment of the present invention will be described below with reference to FIG.

  FIG. 6 is a side sectional view of the LED lighting apparatus according to Embodiment 2 of the present invention. In this figure, the same elements as those shown in FIG. The description will not be repeated.

  The LED lighting device 1 ′ according to the present embodiment is characterized in that the support 4 and the support base 5 are integrally formed, and other configurations are the same as those of the first embodiment.

  Thus, in the present embodiment, since the support tool 4 and the support tool base 5 are integrated, the contact thermal resistance between the support tool 4 and the support tool base 5 is eliminated, and the thermal conductivity is further improved. In addition to the effects, the same effects as in the first embodiment can be obtained.

  The present invention can be suitably applied mainly to outdoor illumination lamps such as general illumination lamps, street lamps, and road lights.

DESCRIPTION OF SYMBOLS 1,1 'LED illuminating device 2 LED light source 3 LED light source housing 3A LED light source housing support part 4 Support tool 4A Support tool flange 5 Support tool base 5a Support tool base notch 5b Support tool base circular hole 5c Support base mounting seat 6 Device base 6A Device base wiring boss 6a, 6b Device base mounting seat 7 Device cover 8 LED substrate 9 LED
DESCRIPTION OF SYMBOLS 10 Base 11 Circular hole of support tool 12 Base socket 13 Support stay 14, 15 Screw hole 16 of instrument base 16, 17 Circular hole of support base 18 Radiation fin

Claims (5)

An LED illumination device configured to attach an LED light source casing that supports an LED light source to an instrument base via a support, and to cover the LED light source, the LED light source casing, and the support together with the instrument base with an instrument cover In
A support base is interposed between the support and the instrument base, the support is fixed in surface contact with the surface of the support base, and the instrument base is in surface contact with the back surface of the support base. LED lighting device characterized by being fixed.   The LED lighting device according to claim 1, wherein the support, the instrument base, and the support base are made of a material having high thermal conductivity.   The LED lighting device according to claim 1, wherein a plurality of heat radiation fins are formed on a back surface of the support base.   The LED lighting device according to any one of claims 1 to 3, wherein the support and the support base are screwed to the instrument base. The LED lighting device according to claim 1, wherein the support and the support base are integrally configured.

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