JP2007042755A - Led-lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED-lighting device which can efficiently dissipate heat generated from an LED device, and which excels in maintenability, because of easy fitting to a box of the lighting device. <P>SOLUTION: The LED lighting device is provided with a substrate 1, having a concave 7 on its front surface wherein a reflection material 2 is provided; an LED element 3 mounted onto the bottom surface of the concave 7; a plurality of fins 1a provided to the rear side of the substrate 1; a box 5 of the lighting device, having grooves 5a to which the fins 1a are fitted detachably, respectively; engaging parts 1b and 1c which are projected from the side surface side of the fins 1a and partly comprises the fin; and engaged parts 5b and 5c which are formed in the grooves 5a of the casing 5 that are to be engaged with the engaging parts 1b and 1c so as to fix the substrate 1 and the box 5 of the lighting device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an LED lighting device that enhances the heat dissipation effect and facilitates the mounting with respect to the mounting of the substrate on which the LED element is mounted and the lighting device housing.

  In an illumination device using LED elements, in general, in order to secure the same amount of light as that of a general illumination device such as a discharge lamp or an incandescent lamp, a plurality of LED elements are used together, and a current flowing through the LED elements is increased. Therefore, it is necessary to increase the amount of light per piece.

  At this time, the heat generated from the LED elements increases as the number of LED elements and current increase, and the life characteristics and light emission efficiency of the LED elements that are semiconductors deteriorate, and the resin filled around the LED elements also deteriorates. It becomes difficult to secure the amount of light required as a light source for illumination.

  For this reason, an LED lighting device with improved heat dissipation has been proposed by a structure in which fins are provided on the back side of the light emitting surface of the substrate on which the LED is mounted to increase the surface area and a structure in which the substrate is attached to a member having higher thermal conductivity. .

  As a first conventional technique, an LED element is mounted on a ceramic substrate, fins are provided on the back surface of the substrate to increase the surface area, and heat generated by the LED element is efficiently radiated to the outside. Further, the fitting convex portion of the ceramic substrate is set to have a slightly larger width dimension than the fitting concave portion of the metal member. If the substrate and the metal member are left in a high temperature atmosphere, the metal member has a larger coefficient of thermal expansion than the ceramic substrate, so the width dimension of the fitting recess of the metal member is the width of the fitting protrusion of the substrate. Larger than the dimensions. In this state, if the mating convex part of the board is inserted into the mating concave part of the metal member, and the ambient temperature is returned from the high temperature to the normal temperature, the board and the metal member are contracted to fit the mating convex part. The recess is fitted to fix the substrate 1 to a metal member having a higher thermal conductivity (see, for example, Patent Document 1).

  As a second conventional technique, the LED element is mounted on the substrate, the lower surface of the substrate is in contact with the upper surface of the heat radiation fixing plate, the heat radiation cover is provided so as to cover the substrate, these are fixed to the resin case with screws, The heat generated by the LED elements is efficiently radiated to the outside (see, for example, Patent Document 2).

JP 2003-243718 (paragraph number 0014, FIG. 1, paragraph number 0031, FIG. 5) JP 2002-299700 (paragraph number 0015, FIG. 5)

  However, in the conventional LED lighting device, since the fins are installed vertically downward with respect to the back surface of the substrate, when these are attached to other members, fixing with screws and an adhesive, or Fixing using thermal expansion was necessary.

  In addition, fixing using an adhesive or thermal expansion has a problem in maintainability because it is difficult to remove the substrate when replacing it.

  The present invention has been made to solve the above-described problems, and efficiently dissipates the heat generated from the LED elements, and an LED lighting device with good maintainability because it can be easily attached to the lighting device housing. The purpose is to provide.

  The LED lighting device according to the present invention includes a substrate having a concave portion provided with a reflector on the front surface, an LED element mounted on the bottom surface of the concave portion, a plurality of fins provided on the back side of the substrate, and these A lighting device housing having a groove portion into which the fins are detachably fitted, a locking portion protruding from a side surface of the fin or the substrate and forming a part of the fin, and the groove portion of the lighting device housing And a locked portion that is locked to the locking portion and fixes the substrate and the lighting device casing.

  As described above, according to the present invention, a plurality of fins provided on the back side of the substrate, a lighting device housing having grooves into which the fins are detachably fitted, and the fins or the substrate A locking portion that protrudes from the side surface and forms a part of the fin, and a cover that is formed in the groove portion of the lighting device casing and is locked by the locking portion to fix the substrate and the lighting device casing. The contact area with the luminaire housing having higher thermal conductivity is increased, the heat generated from the LED element is efficiently radiated to the outside, and the life characteristics and light emission efficiency of the LED element are provided. In addition to preventing deterioration of the resin filled around the LED element, the reliability can be increased, and a part of the fin formed on the substrate can be used to connect the lighting device housing. Can be installed, easy to install It is possible to improve the nonce property.

Embodiment 1 FIG.
1 (a) and 1 (b) are cross-sectional views of the LED illumination device showing Embodiment 1, and FIG. 2 is an exploded perspective view of FIG. 1 (a).
In FIG. 1 and FIG. 2, the LED illumination device wraps the LED element, the substrate 1 having a concave portion 7 with a reflective material 2 provided on the front surface, the LED element 3 mounted on the bottom surface of the concave portion 7, and the LED element. The resin 4 filled in the groove, a plurality of fins 1a provided on the back surface of the substrate 1, and a cross-section is formed in an uneven shape corresponding to these fins 1a, and the fins 1a are attached to and detached from the concave groove 5a. An illuminating device housing 5 that can be fitted is provided.

In the LED lighting device shown in FIG. 1A, a locking portion 1b having a quadrangular cross section is formed on the outer surface of the ends of the fins 1a on both outer sides of the plurality of fins 1a provided on the back surface of the substrate 1. Of the groove portions 5a of the lighting device housing 5 corresponding to these locking portions 1b, the locked portion 5b locked to the locking portion 1b in the outer groove portions 5a corresponding to these locking portions 1b. Is formed.
Further, each fin 1a, each locking portion 1b and each corresponding groove portion 5a, and each locked portion 5b of the substrate 1 are symmetrical with respect to the central axis of the concave portion 7 of the substrate, and FIG. As shown, the shape is long along the longitudinal direction.

In the LED lighting device shown in FIG. 1B, a locking portion 1c having a triangular cross section is formed on the side surface of the second fin 1a from the outside among the plurality of fins 1a provided on the back surface of the substrate 1. Of the groove portions 5a of the apparatus housing 5, a second locked portion 5c from the outside corresponding to these locking portions 1c is formed with a locked portion 5c that is locked to the locking portion 1c.
Further, each fin 1a, each locking portion 1c and each corresponding groove portion 5a, and each locked portion 5c of the substrate 1 are symmetrical with respect to the central axis of the recess portion 7 of the substrate, and the longitudinal direction It is a long shape along.

  The lighting device housing 5 is a material having high thermal conductivity, and the substrate 1 is, for example, a ceramic substrate. The recess 7 has a flat bottom and a continuous slope that narrows from the front to the bottom. Moreover, the reflective material 2 arrange | positioned on the surface of the recessed part 7 is silver, for example, and the reflectance in a visible light area | region is high, and it becomes possible to light-emit efficiently out of the recessed part 7. FIG.

  The LED element 3 is formed of, for example, a gallium nitride-based light emitting layer on a sapphire substrate, and provides power by electrically connecting an electrode bonded to each layer to a wiring portion disposed on the bottom surface of the groove portion. Further, the resin 4 filled in the recess so as to wrap the LED element 3 is a transparent or translucent resin made of an epoxy material, a silicon material, or the like, and particularly has a slow deterioration rate against ultraviolet light or the like. Good weather resistance.

Next, attachment of the substrate 1 and the lighting device housing 5 will be described with reference to FIGS.
When attaching the substrate 1 to the lighting device housing 5, as shown in FIG. 2, the fins 1a and the locking portions 1b of the substrate 1 are combined with the grooves 5a and the locked portions 5b of the lighting device housing 5, respectively. The board | substrate 1 is inserted and fitted from the horizontal direction of the illuminating device housing | casing 5. FIG. At this time, grease having a high thermal conductivity is applied to each fitting portion of the fin 1a, the locking portion 1b, the groove portion 5a of the lighting device housing 5, and the locked portion 5b. Further, the engaging portions 1b on the outer side surfaces of the fins 1a on both outer sides of the substrate 1 are engaged with the engaged portions 5b of the groove portions 5a on both outer sides of the lighting device housing 5, so that the substrate 1 and the lighting device housing are provided. 5 is fixed.

  Similarly, in the case of FIG. 1B, the board 1 is attached to the lighting device housing 5 by combining the fins 1a and the locking portions 1c of the substrate 1 with the grooves 5a and the locked portions 5c of the lighting device housing 5 respectively. When inserted and fitted from the side, the locking portion 1c formed on the outer surface of the second fin 1a from the outside of the substrate 1 is locked to the locked portion 5c of the groove portion 5a of the lighting device housing 5. Then, the substrate 1 and the lighting device housing 5 are fixed.

As described above, the plurality of fins 1a provided on the back side of the substrate 1, the lighting device housing 5 having the groove portions 5a into which the fins 1a are detachably fitted, and the side surfaces of the fins 1a are projected. The locking portions 1b and 1c that are provided and form a part of the fin, and the groove portion 5a of the lighting device housing 5, are locked by the locking portions 1b and 1c to fix the substrate and the lighting device housing. Since the locked portions 5b and 5c are provided, the contact area with the luminaire housing with higher thermal conductivity is increased, the heat generated from the LED element is efficiently radiated to the outside, and the lifetime characteristics of the LED element In addition to preventing deterioration of the light emitting efficiency and the resin filled around the LED element, the reliability can be increased, and a part of the fin formed on the substrate can be used to make the lighting device housing. Easy to attach to the body It is possible to improve the maintainability.
Further, by applying grease having a high thermal conductivity to the fitting portion, the heat generated in the substrate 1 can be radiated to the lighting device housing 5 more efficiently.
Moreover, since the latching | locking parts 1b and 1c were provided left-right symmetrically with respect to the central axis of the recessed part 7 of the board | substrate 1, workability can be improved.

Embodiment 2. FIG.
In Embodiment 1, the shape of the side surface of each fin 1a of each board | substrate 1, each latching | locking part 1b, the groove part 5a of the illuminating device housing | casing 5, and the to-be-latched part 5b is with respect to the central axis of the recessed part 7 of a board | substrate. Symmetrical but
This embodiment is asymmetrical with respect to the central axis of the recess 7 of the substrate 1.

  3 (a) and 3 (b) are cross-sectional views of an LED illumination device showing Embodiment 2 of the present invention. In the figure, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 3A shows a cross section in which a locking portion 1b having a quadrilateral cross section projecting from one outer end surface of the fin 1a on both outer sides of the substrate 1 is formed and projecting from the inner surface of the other end portion. A four-sided locking portion 1d is formed. Corresponding to these locking portions 1b and 1d, locked portions 5b and 5d are formed in the groove portion 5a of the lighting device housing 5, respectively.
Further, the respective locking portions 1b and 1d of the substrate 1 and the corresponding locked portions 5b and 5d corresponding thereto are asymmetrical with respect to the central axis of the concave portion 7 of the substrate.
FIG. 3 (b) shows that engaging portions 1c and 1e having a triangular cross section are formed on the outer surfaces of the second fin 1a from the outside of the substrate 1 and the first fin 1a from the outside of the substrate 1, respectively. Locked portions 5c and 5e are formed in the groove portion 5a of the lighting device housing 5 corresponding to the stop portions 1c and 1e, respectively.
Further, the respective locking portions 1c and 1e of the substrate 1 and the corresponding locked portions 5c and 5e corresponding thereto are not symmetrical with respect to the central axis of the concave portion 7 of the substrate.

Next, attachment of the board | substrate 1 and the illuminating device housing | casing 5 is demonstrated.
In the case of FIG. 3A, the locking portion 1 b protruding from the outer surface of one end of the fin 1 a on both outer sides of the substrate 1 is used as one locked portion 5 b of the groove portion 5 a of the lighting device housing 5. In addition, the locking portion 1d protruding from the inner surface of the other end of the substrate 1 is aligned with the other locked portion 5d of the groove portion 5a of the lighting device housing 5, so that the substrate 1 is mounted on the lighting device housing. The body 5 is inserted from the lateral direction and fitted. At this time, the locking portions 1 b and 1 d of the substrate 1 are locked to the locked portions 5 b and 5 d of the lighting device housing 5 to fix the substrate 1 and the lighting device housing 5.

  In the case of FIG. 3B, each locking portion 1 c protruding from the outer surface of the end of the second fin 1 a from the outside of the substrate 1 and the second fin 1 a from the other outside of the substrate 1. 1e is aligned with the locked portions 5c and 5e, and the board 1 is inserted from the lateral direction of the lighting device housing 5 and fitted. At this time, the locking portions 1 c and 1 e of the substrate 1 are respectively locked with the locked portions 5 c and 5 e of the lighting device housing 5, and the substrate 1 and the lighting device housing 5 are fixed.

  As described above, since the locking portions 1b and 1d or the locking portions 1c and 1e are asymmetrical with respect to the central axis of the concave portion 7 of the substrate 1, the substrate 1 is moved to the lighting device casing 5. The directionality when attaching can be determined. This can prevent erroneous insertion of the substrate 1.

Embodiment 3 FIG.
FIG. 4 is a perspective view of an LED illumination device showing Embodiment 3 of the present invention. In the figure, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, the locking portions 1b, which are part of the fins 1a on both sides of the substrate 1 shown in FIGS. 1 (a) and 2 of the first embodiment, are arranged in the longitudinal direction as shown in FIG. The locking portion 1f is set at a position different from the locking position at which the locking portion 1f of the substrate 1 is locked to the locked portion 5f of the lighting device housing 5, and the locking portion 1f of the lighting device housing 5 is locked. The insertion port 5g to be inserted is provided.
Although FIG. 4 shows one end of the substrate 1 and the lighting device casing 5, the other end also has the same configuration.

  When attaching the substrate 1 to the lighting device casing 5, the locking portions 1f of the fins 1a on both outer sides of the substrate 1 are aligned with the insertion openings 5g provided in the locked portions 5f of the lighting device casing 5, The board | substrate 1 is inserted from the upper direction of the illuminating device housing | casing 5, and after inserting, the latching | locking part 1f of the board | substrate 1 is latched to the to-be-latched part 5f of the illuminating device housing | casing 5.

  As described above, the locking portion 1f is inserted into the locked portion 5f of the lighting device housing 5 at a position different from the locking position where the locking portion 1f provided on the fin 1a is locked. Since the opening 5g is provided, the work of attaching the substrate 1 to the lighting device housing 5 can be facilitated, and the maintainability can be improved.

Embodiment 4 FIG.
FIG. 5 is a cross-sectional view of an LED lighting device showing Embodiment 4 of the present invention. In the figure, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 5, both side surfaces of the fin 1a close to the concave portion 7 of the substrate 1 on which the LED element 3 is mounted and both side surfaces of the groove portion 5a of the lighting device housing to which the fin 1a is fitted are in contact with each other. The electrode 6 for energizing the LED element 3 is provided on the surface.

  In this configuration, at the same time that the substrate 1 is attached to the lighting device housing 5, the electrodes provided on both side surfaces of the fins 1 a of the substrate 1 and both side surfaces of the groove portion 5 a of the lighting device housing are connected.

  As described above, since the electrode 1 for energizing the LED element 3 is provided in the groove 5a of the lighting device housing 5 in which the fin 1a and the fin 1a are fitted so as to contact each other, the substrate 1 and the lighting device The electrical connection is made simultaneously with the mounting of the housing 5, and the electrical connection work can be omitted.

Embodiment 5. FIG.
6 (a) and 6 (b) are cross-sectional views of an LED lighting device showing Embodiment 5 of the present invention, and FIG. 7 is an exploded perspective view of FIG. 6 (a). In the figure, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the LED illumination device shown in FIG. 6A, a fin 1a protruding from the side surface of the substrate 1 and a groove 5a of the illumination device housing 5 corresponding to the fin 1a are formed in a spiral shape. The groove portion 5a also serves as the locked portion 5h.
In the LED lighting device shown in FIG. 6B, a plurality of fins 1a are provided on the back side of the substrate 1, and a locking portion 1h having a triangular cross section is spirally formed on the side surface of the outer fin 1a among the fins 1a. A locked portion 5h that is formed and is locked to the locking portion 1h in the groove 5a outside the lighting device housing 5 is formed in a spiral shape.

  When attaching the board | substrate 1 to the illuminating device housing | casing 5, the fin 1a (locking part 1h) of the board | substrate 1 is screwed and fixed to the groove part 5a (locked part 5h) of the illuminating device housing | casing 5. FIG.

As described above, since the locking portion 1h forming a part of the fin 1a is formed in a spiral shape, it is easy to attach the substrate 1 to the lighting device housing 5, and the substrate 1 is securely attached. Can do.
In the present embodiment, the locking portion 1h is provided on the outside and has a triangular cross section. However, for example, it may be the second from the outside, and the cross section may have a four-sided shape.

It is sectional drawing of the LED lighting apparatus which shows Embodiment 1 of this invention. It is a disassembled perspective view of the LED lighting apparatus which shows Embodiment 1 of this invention. It is sectional drawing of the LED lighting apparatus which shows Embodiment 2 of this invention. It is a disassembled perspective view of the LED lighting apparatus which shows Embodiment 3 of this invention. It is sectional drawing of the LED lighting apparatus which shows Embodiment 4 of this invention. It is sectional drawing of the LED lighting apparatus which shows Embodiment 5 of this invention. It is a disassembled perspective view of the LED lighting apparatus which shows Embodiment 5 of this invention.

Explanation of symbols

1 Substrate, 1a Fin, 1b, 1c, 1d, 1e, 1f, 1h Locking portion, 2 Reflector, 3 LED element, 4 Resin, 5 Illuminating device housing, 5a Groove, 5b, 5c, 5d, 5e, 5f 5h Locked part, 5g insertion port, 6 electrodes.

Claims (6)

A substrate having a concave portion provided with a reflector on the front surface;
LED elements mounted on the bottom surface of the recess,
A plurality of fins provided on the back side of the substrate;
An illuminating device housing having groove portions into which these fins are detachably fitted, and
A locking part protruding from the side of the fin or the substrate and forming a part of the fin;
A locked portion that is formed in the groove portion of the lighting device housing and is locked to the locking portion to fix the substrate and the lighting device housing;
An LED lighting device comprising:   The LED lighting device according to claim 1, wherein the locking portion is provided symmetrically with respect to a central axis of the concave portion of the substrate.   The LED lighting device according to claim 1, wherein the locking portion is provided asymmetrically with respect to a central axis of the concave portion of the substrate.   The locking portion of the lighting device housing is provided with an insertion port into which the locking portion is inserted at a position different from a locking position where the locking portion provided on the fin is locked. The LED lighting device according to claim 1, wherein:   The electrode for energization of the said LED element was provided in the groove part of the illuminating device housing | casing with which this fin and this fin are fitted so that it may mutually contact. LED lighting device. The LED lighting device according to claim 1, wherein a locking portion forming a part of the fin is formed in a spiral shape.

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