JP6136471B2 - Lighting device and heat sink - Google Patents

Description

  The present invention relates to a lighting device and a heat sink.

  2. Description of the Related Art An illumination device using a light emitting element such as an LED (Light Emitting Diode) as a light source is widely used. When a light emitting element such as an LED becomes high temperature, the light emission efficiency is lowered and the lifetime is shortened. Therefore, a heat sink having fins that dissipate heat is provided in the lighting device so as to promote heat dissipation.

  Conventionally, heat sinks made of aluminum die-casting are often used in LED lighting devices. The heat sink made of aluminum die-casting has the following disadvantages in spite of advantages such as a high degree of freedom in the shape of a mounting portion to which other parts are attached and excellent workability.

  When the fins of the heat sink are formed by aluminum die casting, it is necessary to provide a draft angle of the mold, so that the tips of the fins are thin and the fin bases are thick. In the case of an illuminating device, since the diameter of the mounting hole is determined, the shape of the heat sink must also be kept within a certain diameter. For this reason, in order to increase the surface area of the fin, it is necessary to extend the length of the fin. However, the longer the fin, the thicker the root of the fin, and there is a problem that the weight of the heat sink increases. Further, when the heat sink has a complicated structure such as an undercut, the life of the mold is shortened and the manufacturing cost is increased.

  The larger the amount of light (the power consumption is), the larger the amount of heat generated, so the heat sink needs to be larger. In an aluminum die cast heat sink, the larger the size, the more the above-mentioned drawbacks become more pronounced, the larger the shape and weight, and the greater the restrictions on manufacturing parts. For this reason, there are concerns about an increase in cost due to the weight of the apparatus, an increase in initial cost, safety in the event of a fall, and the like.

  On the other hand, Patent Documents 1 and 2 disclose a heat sink having a structure in which a plurality of fins made of a plate material and a mounting base to which the fins are attached are assembled. In this structure, a plurality of protruding ribs are provided on the mounting base, and after inserting the root of the fin into a groove-like slot formed between the protruding ribs, the protruding rib is plastically deformed to fix the fin. doing.

Utility Model Registration No. 3152032 Utility Model Registration No. 3151869

  In the structures of Patent Documents 1 and 2, it is necessary to perform the processing for fixing the fins by plastically deforming the protruding ribs for each of the fins, which increases the assembly cost and reduces the cost. It is difficult to manufacture. Moreover, when the plastic deformation of the protruding ribs is insufficient, the fixing strength of the fins may be reduced, or the contact thermal resistance between the mounting base and the fins may be increased and the heat dissipation may be reduced.

  Further, as a method for attaching the fins, in addition to the structures of Patent Documents 1 and 2, methods such as screw fixing and press-fitting can be considered. However, when fixing the fins one by one with screws, the number of screws becomes great, and it takes a lot of work to assemble. The press-fitting of fins one by one also complicates the assembly process.

  The present invention has been made in order to solve the above-described problems. A light-weight structure with excellent heat dissipation efficiency is manufactured at low cost by an easy assembly method without requiring a complicated mold. An object of the present invention is to provide a lighting device and a heat sink that can be used.

An illumination device according to the present invention includes: a light source that emits light; a base that receives heat transmitted from the light source; a fin that dissipates heat transmitted from the base; and a fixing member that is fixed to the base. The fin is fixed to the base by sandwiching the base end of the fin in between, and the fixing member has a spring part having elasticity, and the base end of the fin is brought to the base side by the elastic force of the spring part. The pressing and fixing member includes a first fixing portion and a second fixing portion on the opposite side of the first fixing portion via a spring portion, and the first fixing portion is provided on an engaging portion provided on the base. The hook is hooked, and the second fixing portion is fixed to the base with a screw .
The heat sink according to the present invention includes a base, a fin for radiating heat transmitted from the base, and a fixing member fixed to the base, and a base end portion of the fin is sandwiched between the base and the fixing member. As a result, the fin is fixed to the base, the fixing member has a spring portion having elasticity, the base end portion of the fin is pressed toward the base side by the elastic force of the spring portion, and the fixing member is the first fixing And a second fixing portion on the opposite side of the first fixing portion via the spring portion, and the first fixing portion has a hook shape that is hooked on the engaging portion provided on the base, and is fixed to the second fixing portion. The part is fixed to the base with screws.

  According to the present invention, it is possible to manufacture a lightweight structure with excellent heat dissipation efficiency at a low cost by an easy assembly method without requiring a complicated mold.

It is a disassembled perspective view of the illuminating device of Embodiment 1 of this invention. It is a perspective view which shows the state which assembled the illuminating device of Embodiment 1 of this invention. It is a perspective view of the heat sink with which the illuminating device of Embodiment 1 of this invention is provided. It is sectional drawing of the heat sink with which the illuminating device of Embodiment 1 of this invention is provided. It is a perspective view of the base with which the heat sink shown in FIG. 3 and FIG. 4 is provided. It is a perspective view of the fin with which the heat sink shown in FIG. 3 and FIG. 4 is provided. It is a perspective view of the fixing member with which the heat sink shown in FIG. 3 and FIG. 4 is provided. It is sectional drawing of the fixing member with which the heat sink shown in FIG. 3 and FIG. 4 is provided.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is an exploded perspective view of the lighting apparatus according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing a state in which the lighting apparatus according to Embodiment 1 of the present invention is assembled. As shown in these drawings, the lighting device 1 according to the first embodiment includes a heat sink (heat sink assembly) 2, a heat dissipation diffusion sheet 6, a light source module 7, a frame member 8, a translucent plate 9, and a frame. (Frame assembly) 10. For example, the lighting device 1 can be mounted in a mounting hole provided on a ceiling or the like and used as a downlight. 1 and 2 show a state in which the illumination device 1 is viewed obliquely from above, and the light projecting direction of the illumination device 1 is the downward direction in FIGS. 1 and 2.

  The heat sink 2 includes a base 3, fins 4, and a fixing member 5 that fixes the fins 4 to the base 3. The detailed structure of the heat sink 2 will be described later.

  The back surface of the light source module 7 is in close contact with the surface of the base 3 opposite to the surface on which the fins 4 are attached, that is, the lower surface of the base 3 through the heat diffusing sheet 6. On the surface side of the light source module 7, a light emitting element (not shown) such as an LED (Light Emitting Diode) is provided as a light source.

  The frame member 8 and the translucent plate 9 are fixed to the lower surface side of the base 3 by a plurality of screws (not shown). The heat dissipation diffusion sheet 6 and the light source module 7 are sandwiched and fixed between the base 3 and the frame member 8. The translucent plate 9 is attached to the lower surface side of the frame member 8.

  The frame 10 is fixed to the lower surface side of the base 3 by a plurality of screws (not shown). The frame 10 has a function of controlling light emitted from the light source module 7 and determining light distribution. The frame 10 is provided with a plurality of leaf spring-like arms 11 for detachably fixing the lighting device 1 to mounting holes provided in a ceiling or the like.

  In the lighting device 1, the heat generated in the light source module 7 is transmitted to the base 3 via the heat radiating diffusion sheet 6, and the heat transmitted to the base 3 is further transmitted to the fins 4, so that the fins 4 having a large surface area efficiently transfer the surrounding air It can dissipate heat. For this reason, since the temperature rise of the light source module 7 can be suppressed, while improving luminous efficiency, the lifetime of a light emitting element can be lengthened.

  FIG. 3 is a perspective view of the heat sink 2. FIG. 4 is a cross-sectional view of the heat sink 2. FIG. 5 is a perspective view of the base 3. FIG. 6 is a perspective view of the fin 4. FIG. 7 is a perspective view of the fixing member 5. FIG. 8 is a cross-sectional view of the fixing member 5.

  The base 3 is a member having a function of receiving heat transmitted from the light source module 7 and a function of supporting the plurality of fins 4. As shown in FIG. 5, in this Embodiment 1, the base 3 is comprised by the flat member of the shape which combined the rectangle and the circle. That is, the base 3 has a shape in which both long side portions of the substantially rectangular plate project in an arc shape. The base 3 is preferably made of a metal material, and particularly preferably made of aluminum or an aluminum alloy. Thereby, the thermal conductivity of the base 3 can be increased, good heat dissipation can be obtained, and the weight can be reduced. The base 3 has a plurality of screw holes 3 a used for fixing the frame member 8 and the light transmitting plate 9, a plurality of screw holes 3 b used for fixing to the frame 10, and a second fixing portion 5 c described later of the fixing member 5. And a plurality of screw holes 3c used for fixing, and an engaging portion 3d for hooking a first fixing portion 5a, which will be described later, of the fixing member 5 are provided. Such a base 3 can be manufactured inexpensively without requiring a complicated mold. In the present invention, the shape of the base 3 is not limited to the above shape, and may be any shape as long as it has a function of receiving heat transmitted from the light source and a function of supporting the fins 4.

  As shown in FIGS. 4 and 6, the fin 4 has a base end portion 4 a and a heat radiating portion 4 b. The base end 4 a is in contact with the upper surface of the base 3 and receives heat from the base 3. The heat radiating part 4b has a large surface area and has a function of radiating heat transmitted from the base end part 4a to the surrounding air. In the first embodiment, the heat radiating portion 4 b has a flat plate shape and is disposed substantially perpendicular to the upper surface of the base 3. The fin 4 according to the first embodiment is formed by processing a thin metal plate, and is particularly preferably formed by sheet metal processing. Such fins 4 can be manufactured at low cost without requiring a complicated mold. As the constituent material of the fin 4, for example, aluminum, aluminum alloy, cold rolled steel plate such as SPCC, electrogalvanized steel plate such as SECC, hot dip galvanized steel plate such as SGCC, stainless steel such as SUS, etc. are preferably used. it can. According to these materials, the thermal conductivity of the fins 4 can be increased, good heat dissipation can be obtained, and the weight can be reduced.

  In the first embodiment, a plurality (six in the illustrated configuration) of fins 4 are attached to the base 3 side by side. Further, in the first embodiment, there are a plurality of types of fins 4 having different sizes (shapes), the two fins 4 at the center are the largest, the two fins 4 arranged on both sides are next largest, Two fins 4 are the smallest. In this invention, not only such a structure but the magnitude | size (shape) of all the fins 4 may be the same.

  In the first embodiment, the base end portion 4a has an elongated shape and has a substantially rectangular flat plate shape. The lower surface of the base end portion 4 a is in close contact with the upper surface of the base 3. A heat conductive sheet or a heat conductive grease may be interposed between the base 3 and the base end portion 4a. In the fin 4 according to the first embodiment, the heat radiating portion 4b is provided on both sides of the base end portion 4a and is substantially perpendicular to the base end portion 4a. That is, in the first embodiment, one fin 4 includes a pair of heat radiating portions 4b on both sides of the base end portion 4a, and the base end portion 4a and the pair of heat radiating portions 4b are U-shaped cross-sectional shapes. (See FIG. 4). In the present invention, not limited to such a configuration, the base end 4a and the heat dissipating part 4b are provided one by one on the fin 4, and the base end 4a and the heat dissipating part 4b form an L-shaped cross-sectional shape. It may be configured.

  As shown in FIG. 7, the fixing member 5 is a substantially plate-shaped member. The fixing member 5 is overlapped and fixed to the surface of the base 3 to which the fins 4 are attached, that is, the upper surface side of the base 3. The fin 4 is fixed to the base 3 by sandwiching the base end portion 4 a of the fin 4 between the fixing member 5 and the base 3. The fixing member 5 of the first embodiment has a substantially rectangular shape, and a first fixing portion 5a having a bowl shape is formed on one side of the rectangle, and on the opposite side, A second fixing portion 5c having a hole 5b through which a screw (not shown) is passed is formed. The hole 5 b is formed at a position corresponding to the screw hole 3 c of the base 3. In the first embodiment, the hole 5b and the screw hole 3c are formed at three locations. The fixing member 5 hooks the hook-shaped first fixing portion 5a to the engaging portion 3d of the base 3, and tightens a screw (not shown) passed through the hole 5b into the screw hole 3c of the base 3 to fix the second fixing portion 5c. By fixing, the base 3 is fixed. Thus, in the first embodiment, the number of screws (three) for fixing the fixing member 5 to the base 3 is smaller than the number of fins 4 (six). For this reason, the number of screws required for fixing the fins 4 can be reduced.

  In addition, the method of fixing the fixing member 5 to the base 3 is not limited to the above method. For example, both the first fixing portion 5a and the second fixing portion 5c are hooked to form the edge portion of the base 3. The fixing member 5 may be fixed to the base 3 only by fixing the screw without using the hook-shaped portion.

  The fixing member 5 is further formed with a plurality of elongated openings 5d and a plurality of spring portions 5e. The heat radiating part 4b of the fin 4 is inserted into the opening 5d. The number of the openings 5d is the same as the total number of the heat radiating portions 4b of all the fins 4 (12 in the first embodiment). The size (length) of the opening 5d is such that the heat radiating portion 4b of the fin 4 can be inserted smoothly. These openings 5d extend in a direction connecting the first fixing portion 5a and the second fixing portion 5c, and are formed in parallel to each other.

  The number of spring portions 5e is the same as the number of fins 4 (six in the first embodiment). The spring portion 5e is formed between a pair of openings 5d into which the pair of heat radiation portions 4b of the fins 4 are inserted. The spring portion 5 e has an elongated shape extending along the base end portion 4 a of the fin 4. The spring portion 5e has elasticity and can be elastically deformed. As shown in FIG. 8, the shape of the spring portion 5e has a substantially waveform in which peaks and valleys repeat. In the first embodiment, as shown in FIG. 7, the region excluding the first fixing portion 5a and the second fixing portion 5c of the fixing member 5 includes the portion other than the spring portion 5e and includes the spring portion 5e. The cross-sectional shape of the substantially waveform is the same.

  The fixing member 5 of the first embodiment is configured by processing a thin metal plate, and is particularly preferably formed by sheet metal processing. Such a fixing member 5 can be manufactured at low cost without requiring a complicated mold. The constituent material of the fixing member 5 is not particularly limited, but it is preferable to use, for example, spring steel or the like in order to make the spring portion 5e have excellent spring properties.

  As shown in FIG. 4, the pair of heat radiating portions 4b of each fin 4 is inserted into a corresponding pair of openings 5d. The fin 4 is fixed to the base 3 by sandwiching the base end portion 4 a of the fin 4 between the spring portion 5 e between the pair of openings 5 d and the base 3. Then, the valley portion of the substantially corrugated spring portion 5e comes into contact with the base end portion 4a of the fin 4, and the fixing member 5 causes the base end portion 4a to be the base 3 by the elastic force (spring force) exerted by the spring portion 5e. It is in the state pressed to the side.

  As described above, in the heat sink 2 of the first embodiment, a plurality of (six in the illustrated configuration) fins 4 can be fixed to the base 3 by one fixing member 5. For this reason, compared with the structure which fixes each fin 4 to the base 3 separately by screw fixation, press fit, etc., the heat sink 2 of this Embodiment 1 can be assembled very easily. . In addition, the base 3, the fin 4, and the fixing member 5 constituting the heat sink 2 can be easily manufactured without requiring a complicated mold. Moreover, in the structure which fixes each fin 4 separately, when any fin 4 becomes improperly fixed, the fixing strength of the fin 4 decreases or the fin 4 contacts the base 3. There is a possibility that heat resistance increases and heat dissipation decreases. On the other hand, according to the first embodiment, by fixing one fixing member 5 to the base 3 reliably, all the fins 4 can be fixed securely, so that the fixing failure of the fins 4 occurs. This can be suppressed. Therefore, each fin 4 and the base 3 can be securely fixed and the contact thermal resistance between them can be reliably reduced, so that the heat sink 2 having excellent heat dissipation efficiency can be obtained. In addition, in an aluminum die cast heat sink, since it is necessary to thicken the base of the fin in order to provide a draft angle of the mold, the longer the fin, the heavier the weight. On the other hand, in the heat sink 2 of this Embodiment 1, since it is not necessary, even if it is a case where the long fin 4 is provided, the fin 4 can be made thin to the root and can be comprised lightweight. it can. As described above, according to the first embodiment, the heat sink 2 that is lightweight and has excellent heat dissipation efficiency can be easily assembled and inexpensively manufactured without requiring a complicated mold. Is possible. As a result, it is possible to improve the heat dissipation of the lighting device 1 using such a heat sink 2, improve the light emission efficiency and life of the light source, and manufacture the lighting device 1 at low cost.

  Moreover, in the heat sink 2 of this Embodiment 1, the base end part 4a of the fin 4 is pressed by the elastic force of the spring part 5e of the fixing member 5, and the base end part of the base 3 and the fin 4 is pressed. 4a can be more reliably adhered over the entire surface. For this reason, the contact thermal resistance between the base 3 and the base end portion 4a of the fin 4 is further reduced, and heat conduction from the base 3 to the fin 4 is promoted, so that more excellent heat dissipation is obtained. In particular, since the spring portion 5e has a substantially waveform, the elastic force of the spring portion 5e can be exerted greatly, and the base end portion 4a of the fin 4 can be pressed toward the base 3 side with a stronger force.

  As shown in FIG. 8, in the first embodiment, the spring portion 5e having a substantially waveform has four peaks 5f, 5g, 5h, 5j and three valleys 5k, 5m, 5n. The portions of the three valleys 5k, 5m, and 5n of the spring portion 5e come into contact with the upper surface of the base end portion 4a of the fin 4 and press the base end portion 4a. In the first embodiment, the heights of the peaks 5g and 5h near the center of the spring portion 5e in the longitudinal direction are the heights of the peaks 5f and 5j near the ends of the spring portion 5e in the longitudinal direction. It is higher than that. For this reason, in a state where the heat sink 2 is assembled, the deformation amount of the spring portion 5e near the center in the longitudinal direction is larger than the deformation amount of the spring portion 5e near the both ends in the longitudinal direction. Therefore, the elastic force acting on the valley 5m located near the center in the longitudinal direction of the spring part 5e is compared with the elastic force acting on the valleys 5k, 5n located near both ends in the longitudinal direction of the spring part 5e. Get higher. Thereby, the following effects are obtained. In general, the central portion (valley 5m) in the longitudinal direction of the spring portion 5e is located far from the first fixing portion 5a and the second fixing portion 5c, so the base end portion 4a of the fin 4 is pressed toward the base 3 side. The power to do is likely to weaken. On the other hand, as in the first embodiment, the height of the waves (mountains 5g, 5h) near the center in the longitudinal direction of the spring portion 5e is set to a position close to both ends in the longitudinal direction of the spring portion 5e. By making it higher than the height of a certain wave (mountain 5f, 5j), the elastic force acting near the center in the longitudinal direction of the spring portion 5e can be increased. For this reason, it can suppress that the force which presses the center part of the longitudinal direction of the base end part 4a of the fin 4 to the base 3 side becomes weak, and the whole base end part 4a of the fin 4 can be uniformly equal to the base 3 side. Can be pressed. Therefore, the base 3 and the base end part 4a of the fin 4 can be more reliably adhered. As a result, the contact thermal resistance between the base 3 and the base end portion 4a of the fin 4 is further reduced, and heat conduction from the base 3 to the fin 4 is promoted, so that further excellent heat dissipation is obtained.

  Moreover, in this Embodiment 1, since it was comprised so that the thermal radiation part 4b of the fin 4 might be inserted in the opening 5d provided in the fixing member 5, the positioning of the fin 4 with respect to the base 3 can be performed easily and reliably. . Moreover, as shown in FIG. 4, since there is a slight gap between the opening 5d and the heat radiating portion 4b of the fin 4, a process such as press-fitting is unnecessary, and assembly can be easily performed.

  Further, in the first embodiment, since the cross-sectional shape of the fin 4 is U-shaped, there is no mistake in the mounting direction of the fin 4 with respect to the opening 5d of the fixing member 5, so that assembly is further facilitated. It can be carried out. In addition, since two heat dissipating parts 4b can be provided for each spring part 5e, a large surface area can be easily secured, which is advantageous for improving heat dissipation.

  In the first embodiment, the configuration in which the heat sink of the present invention is used for heat dissipation of the light source of the lighting device has been described. However, the heat sink of the present invention is not limited to the lighting device, and is similar to heat dissipation of other electronic devices. Can be used.

DESCRIPTION OF SYMBOLS 1 Illuminating device, 2 Heat sink, 3 Base, 3a, 3b, 3c, 3d Screw hole, 4 Fin, 4a Base end part, 4b Heat radiation part, 5 Fixing member, 5a 1st fixing part, 5b hole, 5c 2nd fixing part 5d opening, 5e spring portion, 5f, 5g, 5h, 5j mountain, 5k, 5m, 5n valley, 6 heat diffusing sheet, 7 light source module, 8 frame member, 9 translucent plate, 10 frame, 11 arm

Claims (9)

A light source that emits light;
A base that receives heat transmitted from the light source;
A fin for radiating heat transmitted from the base;
A fixing member fixed to the base;
With
The fin is fixed to the base by sandwiching a base end portion of the fin between the base and the fixing member ,
The fixing member has a spring portion having elasticity, and presses the base end portion of the fin toward the base side by an elastic force of the spring portion,
The fixing member includes a first fixing part and a second fixing part on the opposite side of the first fixing part via the spring part,
The first fixing portion has a hook shape that is hooked on an engagement portion provided on the base,
The second fixing portion is a lighting device fixed to the base by a screw . The fixing member includes a plurality of openings extending in a direction connecting the first fixing portion and the second fixing portion and formed in parallel to each other, and a plurality of spring portions arranged in a direction orthogonal to the direction. The lighting device according to claim 1. Lighting apparatus according to claim 1 or 2, wherein the cross-sectional shape of the spring portion has a substantially waveform.   The lighting device according to claim 3, wherein the height of the wave located near the center of the spring portion is higher than the height of the wave located near both ends of the spring portion.   The lighting device according to any one of claims 1 to 4, wherein one or both of the fin and the fixing member are formed by sheet metal processing.   The lighting device according to claim 1, wherein the plurality of fins are fixed by one fixing member.   The lighting device according to claim 1, wherein the fin is a plate-like member having a U-shaped or L-shaped cross section.   The lighting device according to claim 1, wherein the fixing member has an opening into which the fin is inserted. Base and
A fin for radiating heat transmitted from the base;
A fixing member fixed to the base;
With
The fin is fixed to the base by sandwiching a base end portion of the fin between the base and the fixing member ,
The fixing member has a spring portion having elasticity, and presses the base end portion of the fin toward the base side by an elastic force of the spring portion,
The fixing member includes a first fixing part and a second fixing part on the opposite side of the first fixing part via the spring part,
The first fixing portion has a hook shape that is hooked on an engagement portion provided on the base,
The second fixing part is a heat sink fixed to the base by screws .

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