JP2013143234A - Lighting device and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device that can enhance heat radiation effect and moreover suppressing the size of the entire device, and a method for manufacturing the same.SOLUTION: The lighting device 10 includes an LED substrate 20, with LEDs 22 mounted on a base substrate 21 being a light source, a reflection part 21 for reflecting the light from the LEDs 22 frontward by a slanted face surrounding the LED substrate 20, and a radiator part 23 arranged extending backward from a top edge part of the reflection part 21. Since this radiator part 23 is formed to be accommodated in a range of the reflection part 42 when viewed from an opening part side of the reflection part 21, the size of the entire device 10 is not enlarged, even if the radiator part 43 is provided in a device body 40. Therefore, in the lighting device 10, radiation effect can be enhanced and the size of the entire device can be suppressed as well.

Description

  The present invention relates to an illuminating device including a reflecting portion surrounding a light source and a radiator extending in a proximal direction from the distal end of the reflecting portion, and a manufacturing method thereof.

2. Description of the Related Art An illumination device is known in which a reflection unit that reflects light radiated radially around a light source in one direction surrounds the light source (see, for example, Patent Document 1). .
The lighting device described in Patent Document 1 is provided with a parabola part, a bottom part, a cylindrical part, and a diameter-enlarged part that expands so that the base of the mountain extends from the tip of the parabola part. It is provided with a reflector formed by die casting.

JP 2010-80060 A

  In the illuminating device described in Patent Document 1, since the reflector is provided with not only the parabolic portion but also the enlarged diameter portion whose diameter gradually increases from the distal end of the parabolic portion toward the proximal end, the heat from the light source is If it can be efficiently transmitted to the entire reflector, the enlarged diameter part will also function as a radiator. However, since the enlarged diameter portion is provided so that the base of the mountain expands from the tip position of the parabolic portion, the overall size of the lighting device increases.

  Then, an object of this invention is to provide the illuminating device which can suppress the magnitude | size of the whole apparatus, and its manufacturing method, improving the thermal radiation effect.

  The illuminating device of the present invention has a reflecting portion that reflects light from the light source forward by an inclined surface that surrounds the light source, and extends rearward from the tip of the reflecting portion, and is viewed from the opening side of the reflecting portion. And a heat dissipating part that falls within the range of the reflecting part.

According to the illuminating device of the present invention, heat from the light source can be transmitted to the heat radiating portion via the reflecting portion, and can be radiated from the heat radiating portion extending rearward from the tip portion of the reflecting portion. This heat dissipation part
Since it is formed so as to be within the range of the reflection part when viewed from the opening side of the reflection part, when the illumination device of the present invention is viewed from the opening side of the reflection part, the heat dissipation part cannot be seen. Even if it is provided, heat generation by the light source can be effectively suppressed by heat dissipation without causing the user to feel that the size of the entire apparatus has increased.

  When the device body including the reflecting portion and the heat radiating portion is formed of pure aluminum having an oxide film formed by anodizing, the anodizing increases the infrared emissivity of the surface, so that the heat dissipation effect by radiation Can be improved.

  Since the surface area of the heat radiating portion can be increased when the uneven surface is formed on the heat radiating portion, the heat radiating effect can be further enhanced.

  It is desirable that the uneven surface has a plurality of grooves from the proximal end side to the distal end side of the heat radiating portion formed along the circumferential direction of the heat radiating portion. When the lighting device of the present invention is used as a downlight with the opening of the reflecting portion facing downward, a plurality of grooves from the base end side to the tip end side of the heat radiating portion are arranged along the vertical direction. Therefore, since the air heated by the heat radiation of the heat radiating portion rises vertically along the groove, the heat can be effectively radiated.

  Even if a plurality of grooves in the circumferential direction of the heat radiating portion are formed as the uneven surface along the extending direction of the heat radiating portion, the surface area can be increased, so that the heat radiating effect can be improved.

  If the heat radiating part is provided with a vent hole, new air having a low temperature enters the space between the heat radiating part and the reflecting part through the vent hole, and reflects from the inner peripheral surface of the heat radiating part. It flows along the back of the part. Because the air flow cools the heat radiating portion and the reflecting portion, heat can be efficiently radiated.

  It is desirable that the vent hole is provided at a base end portion of the heat radiating portion. When the lighting device of the present invention is used as a downlight with the opening of the reflecting portion facing downward, the vent hole is located at the lower portion of the device main body. Therefore, the vent hole provided in the base end portion of the heat radiating portion 435 is located in the lower portion of the apparatus main body. Therefore, new air having a low temperature entering from the vent hole rises while taking heat from the heat dissipating part and the reflecting part along the inner peripheral surface of the heat dissipating part and the back surface of the reflecting part. It is possible to dissipate heat efficiently.

  The illuminating device of the present invention is a method of manufacturing an illuminating device having an apparatus main body including a reflecting portion that reflects light from the light source forward by an inclined surface that surrounds the light source, and a heat radiating portion that radiates heat generated by the light source. The metal plate is squeezed by a spatula drawing process using a first mold in which a bottom portion on which the light source is disposed and a peripheral surface corresponding to the inclined surface of the reflecting portion is formed, and the first A step of transferring the mold surface of the mold to process the bottom portion and the reflecting portion, and a metal plate to which the mold surface of the first mold is transferred, and a recess corresponding to the bottom portion and the inclined surface. A second mold that is extended rearward from the front end portion of the reflecting portion and is formed with an outer peripheral surface corresponding to a heat radiating portion that falls within the range of the reflecting portion when viewed from the opening side of the reflecting portion. Using a spatula drawing process, transferring the mold surface of the second mold, and They can be produced by a production method of a lighting device characterized by comprising a step of processing the thermal unit.

  In the present invention, since the heat radiating portion does not protrude from the reflecting portion, the size of the entire device can be suppressed. Therefore, the size of the entire device can be suppressed while enhancing the heat dissipation effect.

It is a figure for demonstrating the illuminating device which concerns on Embodiment 1 of this invention, (A) is a front view, (B) is a rear view, (C) is the perspective view seen from the front side, (D) is It is the perspective view seen from the back side. It is a top view which shows the LED board of the illuminating device shown in FIG. It is an AA line end view of the illuminating device shown to FIG. 1 (A). (A) to (H) are diagrams for explaining a method of manufacturing the apparatus main body of the illumination apparatus shown in FIG. It is a partial end view for demonstrating the heat transfer and heat dissipation of the apparatus main body of the illuminating device shown in FIG. It is a figure for demonstrating the effect of the illuminating device shown in FIG. 1, (A) is an end view which shows the conventional illuminating device provided with the heat sink, (B) is an end view which shows the illuminating device shown in FIG. (C) is an end view showing a conventional lighting device provided with a large heat sink, and (D) is an end view showing the lighting device provided with a small heat sink. It is an end elevation which shows the 1st modification of the illuminating device shown in FIG. It is an end elevation which shows the 2nd modification of the illuminating device shown in FIG. It is an end elevation which shows the 3rd modification of the illuminating device shown in FIG. It is an end elevation which shows the 4th modification of the illuminating device shown in FIG. It is a figure for demonstrating the illuminating device which concerns on Embodiment 2 of this invention, (A) is a front view, (B) is a rear view, (C) is the perspective view seen from the front side, (D) is It is the perspective view seen from the back side. It is the BB line end view of the illuminating device shown to FIG. 11 (A). It is a partial end view for demonstrating the effect of the ventilation hole of the apparatus main body of the illuminating device shown in FIG. It is a figure for demonstrating the illuminating device which concerns on Embodiment 3 of this invention, (A) is a front view, (B) is a rear view, (C) is the perspective view seen from the front side, (D) is It is the perspective view seen from the back side. It is CC line end view of the illuminating device shown to FIG. 14 (A). (A) to (D) are diagrams for explaining a method of forming an uneven surface of the apparatus main body of the illumination apparatus shown in FIG. It is a figure for demonstrating the illuminating device which concerns on Embodiment 4 of this invention, (A) is a front view, (B) is a rear view, (C) is the perspective view seen from the front side. It is the perspective view which looked at the illuminating device shown in FIG. 17 from the back side. It is the DD line end view of the illuminating device shown to FIG. 17 (A). It is a figure for demonstrating the illuminating device which concerns on Embodiment 4 of this invention, (A) is a front view, (B) is a rear view, (C) is the perspective view seen from the front side, (D) is It is the perspective view seen from the back side. It is the EE end view of the illuminating device shown to FIG. 20 (A).

(Embodiment 1)
A lighting apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. In this specification, the opening side of the reflecting portion is referred to as the front, the opposite side is referred to as the rear, the illumination direction is referred to as the front, and the opposite side is referred to as the rear. Further, in the drawings, only main component configurations are illustrated, and a power supply unit for lighting the LED, a mounting bracket for mounting on or hanging from the wall surface or ceiling, and the like are not illustrated.
As shown in FIGS. 1 and 3, the lighting device 10 includes an LED substrate 20, a lens 30, and a device main body 40.

As shown in FIG. 2, the LED substrate 20 is obtained by arranging LEDs 22 in an annular shape on a base substrate 21 formed in a disk shape.
The base substrate 21 is provided with a wiring pattern 211 for connecting the LEDs 22 in series. Further, a through hole 212 for screwing is formed in the center of the base substrate 21.
The LEDs 22 are arranged at predetermined intervals on the circumference centered on the through hole 212. In the present embodiment, twelve LEDs are arranged on the base substrate 21 every 30 °.

The lens 30 shown in FIGS. 1 and 3 is formed in a substantially annular shape with a center axis as a center of a circle by a translucent resin, and distributes the light from the LED 22 forward or outward.
The lens 30 is provided with a guide hole 31 for inserting a screw at the center. In the lens 30, an annular groove 32 for arranging the LED 22 is formed as an incident surface. An inner peripheral side total reflection surface 33 that totally reflects light from the LED 22 forward (in the illumination direction) is formed on the inner peripheral side of the lens 30 with respect to a position where the LED 22 is disposed (position of the groove 32). Yes. A front side transmission surface 34 is formed on the inner peripheral side front surface of the lens 30 to transmit the light totally reflected by the inner peripheral side total reflection surface 33 without being refracted as it is. Further, the lens 30 is formed with a front-side total reflection surface 35 that totally reflects light traveling forward from the LED 22 and travels outward. On the outer peripheral side of the lens 30, an outer peripheral side transmission surface 36 that transmits the light totally reflected by the front side total reflection surface 35 without being refracted as it is is formed.

The apparatus main body 40 is configured such that a bottom portion 41, a reflection portion 42, and a heat radiation portion 43 are integrally formed. The apparatus main body 40 can be formed of various materials by various processing methods, but in the apparatus main body 40 of the present embodiment, a single sheet of pure aluminum having a purity of 99% or more is drawn by a spatula. It is formed by doing.
The LED substrate 20 is disposed on the bottom 41. The bottom portion 41 is formed in a disc shape and has a through hole to be screwed.
The reflection part 42 reflects the light from the lens 30 forward. The reflecting portion 42 is formed so that the area of the opening 42a gradually increases toward the front by an inclined surface surrounding the LED 22 that is a light source, and a reflecting surface having an inner peripheral surface as a mirror surface is formed.
The heat dissipating part 43 extends rearward from the tip of the reflecting part 42. Further, since the heat radiating portion 43 is formed in a cylindrical shape having the diameter of the tip portion of the reflecting portion 42, the heat radiating portion 43 is within the range of the reflecting portion 42 when viewed from the opening side of the reflecting portion 42. .

Here, the manufacturing method of the apparatus main body 40 formed by a spatula drawing process is demonstrated based on FIG.
First, a spatula drawing process is performed. In the spatula drawing step, first, a circular flat surface 72a corresponding to the flat bottom portion 41, an inclined surface 72b corresponding to the reflecting portion 42, and an annular ring-shaped flat surface 72c provided around the inclined surface 72b. A first mold 72 is prepared which is a male mold having. In addition, a disk-shaped aluminum plate 4 to be the device main body 40 is prepared.

Next, the axis of the first mold 72 is aligned with the axis of the rotary table 71, and the center of the prepared disk-shaped aluminum plate 4 is aligned with the axis, and the center position of the aluminum plate 4 is arranged. To fix the aluminum plate 4 (see FIG. 4A).
Next, the rotary table 71 is rotated, and the aluminum plate 4 is pressed along the inclined surface 72b of the first mold 72 with a spatula or a roller (see FIG. 4B). In this embodiment, the roller 73 presses the aluminum plate.
By pressing the aluminum plate 4 with the roller 73 along the inclined surface 72b of the first mold 72, the aluminum plate 4 is narrowed down, and the reflecting portion 42 is formed around the aluminum plate 4 serving as the bottom 41 (see FIG. (See FIG. 4C).
Furthermore, the mold surface of the first mold 72 is transferred to the aluminum plate 4 by moving the roller 73 from the inclined surface 72b onto the ring-shaped flat surface 72c and pressing the roller 73 on the ring-shaped flat surface 72c ( (See FIG. 4D).

When molding by the first mold 72 is completed, the processed aluminum plate 4 and the first mold 72 are removed from the rotary table 71, and the second mold 74 is disposed. Further, the aluminum plate 4 to which the mold surface of the first mold 72 is transferred is disposed and fixed (see FIG. 4E).
The second mold 74 is a cylindrical surface that hangs down from a ridge line of the inclined surface 74b and a concave portion that includes a bottom surface 74a that is a circular flat surface corresponding to the bottom portion 41 and an inclined surface 74b that corresponds to the reflecting portion 42. It has a certain outer peripheral surface 74c.
The aluminum plate 4 processed in this recess is arranged, fixed, rotated, and is narrowed by pressing by the roller 73 from the ridge line (upper end) of the inclined surface 74b toward the lower end of the outer peripheral surface 74c (FIG. 4F). ) And FIG. 4 (G)).
By sequentially narrowing along the outer peripheral surface 74c by the roller 73, the heat radiating portion 43 is formed, and the mold surface of the second mold 72 is transferred to the aluminum plate 4 to which the first mold 72 is transferred. (See FIG. 4H).
In this way, the aluminum plate 4 can be formed on the apparatus main body 40 by spatula drawing. In particular, if the aluminum plate 4 is made of pure aluminum having a thickness of, for example, about 1 mm, it can be easily formed by spatula drawing.

  Next, the process proceeds to a mirror finishing process on the surface of the reflecting portion 42. When the aluminum plate 4 is pure aluminum having a purity of 99% or more, for example, if electrolytic polishing and subsequent anodizing treatment are performed, the plate material itself has a high reflectivity. It can be a specular reflector. Moreover, in this Embodiment, after forming the apparatus main body 40, the thermal radiation coating material is apply | coated other than a reflective surface.

The heat radiation of the lighting apparatus 10 according to the embodiment of the present invention configured as described above will be described with reference to FIG. In FIG. 5, the heat transfer is indicated by arrows.
When the LED 22 generates heat by emitting light, the heat is transferred to the bottom 41 via the base substrate 21. At the bottom 41, heat is dissipated to the back side and heat is transferred to the reflecting portion 42. In the reflecting part 42, heat is radiated from both the lens 30 side (front side) and the back side (back side) and is also transferred to the heat radiating part 43. In the heat radiating part 43, heat is radiated from both the outer side (front side) and the inner side (back side). Thus, the reflection part 42 not only reflects the light from the LED 22, but also functions as a heat radiator.

Here, the heat dissipation according to the material which forms an apparatus main body is examined.
In order to efficiently transfer heat to the entire apparatus main body including the reflection portion, it is necessary to consider the thermal conductivity of the material. For example, if the material of the apparatus body is made of resin, there is polycarbonate that seems to be optimal. However, the thermal conductivity of polycarbonate is as low as 0.19 W / m · K, and it is difficult for heat to be transmitted. Therefore, if the apparatus main body is made of polycarbonate, it can be said that there is almost no heat dissipation effect. Some resins have a high thermal conductivity of about 20 to 25 W / m · K, but to be used as a reflector (reflector), the surface needs to be mirror-finished by aluminum deposition after molding, so the surface must be flat. It is. For example, since the above-mentioned polycarbonate has a high flatness after molding, it can be mirror-finished by aluminum vapor deposition. However, there are few materials that have high thermal conductivity and high surface flatness after molding, and even if they exist, the material cost increases. Moreover, although the heat conductivity of about 20-25 W / m * K is high as resin, it is about 1/10 compared with a metal with high heat conductivity, and the heat dissipation effect cannot be expected.

  When the device body is formed by aluminum die casting, the material is an aluminum alloy, so the thermal conductivity is high. For example, a general aluminum alloy ADC12 for aluminum die-casting has a thermal conductivity of about 96 W / m · K, which is very high as compared with a resin, and a certain heat dissipation effect can be expected. However, with aluminum die-casting, the surface flatness cannot be molded high and the reflectivity is low, so to make the surface mirror after molding, apply a paint that ensures flatness to the surface. (Generally referred to as undercoat), then aluminum deposition is required. Therefore, heat radiation from the surface is hindered by the paint applied for the undercoat. In addition, the formation of the reflective portion is costly. Furthermore, since aluminum alloys for aluminum die casting contain impurities such as silicon in order to improve castability, the thermal conductivity is lower than that of pure aluminum. (The thermal conductivity of pure aluminum is 236 W / m · K) Therefore, the heat radiation effect is reduced as compared with the case where the reflective part and the heat radiation part are made of pure aluminum.

  The heat dissipating part 43 which is the outer peripheral surface of the apparatus main body 40 dissipates the transmitted heat to the surroundings. The apparatus main body 40 is pure aluminum having a high thermal conductivity of 236 W / m · K, and the heat dissipating part 43 is a reflecting part. Since it is integrally formed with the seam 42, the efficiency of heat conduction to the heat radiating portion 43 is high, and high heat radiating performance can be provided.

  Further, since the plate material itself is exposed in the reflecting portion 42 subjected to electrolytic polishing and alumite treatment, heat radiation from the surface is not hindered. Rather, the oxide film formed by alumite treatment increases the infrared emissivity of the surface and increases the heat dissipation effect by radiation, so it is desirable to form the device body 40 with pure aluminum having a purity of 99% or more.

Next, the effect of the present invention will be described by comparing the lighting device 10 according to the first embodiment with a conventional lighting device.
For example, the apparatus main body as shown in FIG. 6 (A) has only a reflection part 42 and no heat radiating part. Instead, a conventional lighting apparatus in which a heat sink 61 is provided on the back of the bottom of the apparatus main body, and FIG. Compared with the lighting device 10 provided with the heat radiation part 43 as shown in B), since the heat radiation part 43 is provided in the lighting device 10, the surface integration of the heat radiation part 43 and the surface area contributing to heat radiation become wide. . Therefore, the heat sink 61 can be omitted in the lighting device 10 illustrated in FIG.

  In addition, the heat sink 61 of the lighting device shown in FIG. 6A has a large (high) long (high) radiating fin as shown in FIG. In the case of the lighting device provided with the heat sink 62, a small heat sink 63 having a short (low) length (height) is provided by providing the heat radiating portion 43 as shown in FIG. be able to. Accordingly, the lighting device 10 can suppress the height of the entire lighting device.

  The size of the lighting device is determined by the size of the area of the opening of the reflecting portion, rather than the depth of the device. Therefore, since the heat radiation part 43 of the lighting device 10 is formed so as to be within the range of the reflection part 42 when viewed from the opening side of the reflection part 42, even if the heat radiation part 43 is provided as the apparatus main body 40, The entire lighting device 10 does not become large. In particular, when the lighting device 10 is used as a downlight embedded in the ceiling, the outer diameter of the heat radiating portion 43 is substantially equal to or smaller than the outer diameter of the reflecting portion 42, so that the hole for embedding in the ceiling is greatly expanded. There is no need.

(Modification of lighting apparatus according to Embodiment 1)
A modification of the lighting device according to Embodiment 1 of the present invention will be described with reference to FIGS. 7 to 10, the same components as those in FIG. 3 are denoted by the same reference numerals and description thereof is omitted.

(First modification)
In the lighting device 101 illustrated in FIG. 7, the heat sink 63 is provided on the bottom portion 41 as in FIG. Further, an insulating heat transfer sheet 23 is sandwiched between the LED substrate 20 and the apparatus main body 40. The heat transfer sheet 23 is a sheet having high heat transfer properties and soft and sticky. The heat transfer sheet 23 can be in close contact with both the concave and convex surfaces of the LED substrate 20 and the bottom portion 41 to enhance heat transfer from the LED substrate 20 to the bottom portion 41. Therefore, the heat generated in the LED substrate 20 can be easily transferred to the heat transfer sheet 23, and the heat from the heat transfer sheet 23 can be easily transferred to the bottom 41. Then, heat can be radiated from the heat sink 63 by transferring heat from the bottom 41 to the heat sink 63.

(Second modification)
In the illuminating device 102 shown in FIG. 8, the heat transfer sheet 23 is sandwiched between the LED substrate 20 and the device main body 40, as in the illuminating device 101 shown in FIG. 7, but at the bottom 412 of the device main body 402. A hole 41a for contacting the LED substrate 20 and the heat sink 64 via the heat transfer sheet 23 is formed. The hole 41a may have any shape as long as a convex portion 64a formed on the bottom surface of the heat sink 64 is inserted.
Heat from the peripheral edge of the LED substrate 20 is transmitted from the heat transfer sheet 23 through the bottom 412 and is transmitted to the heat sink 64, but heat from the center of the LED substrate 20 is directly transmitted from the heat transfer sheet 23 to the heat sink 64. As a result, heat can be radiated from the heat sink 64, so that the heat transfer path can be shortened.

(Third Modification)
In the lighting device 103 illustrated in FIG. 9, the heat transfer sheet 23 is provided between the LED substrate 20 and the heat sink 64. Further, a hole 41 a for allowing the LED substrate 20 to be seen is formed on the bottom side 413 of the apparatus main body 403 on the front side of the LED substrate 20. The hole 41a is desirably drilled to a size that does not affect the arrangement of the LED 22 and the lens 30. Further, a heat transfer sheet 24 in which a hole having substantially the same contour shape as that of the hole 41 a is formed between the bottom portion 413 in which the hole 41 a is formed and the LED substrate 20.

  Since the lighting device 103 is thus formed, the heat from the entire LED substrate 20 can be directly transferred from the heat transfer sheet 23 to the heat sink 64 and can be dissipated from the heat sink 64, which is shown in FIG. Similar to the heat from the central portion of the LED substrate 20, the heat transfer path can be shortened. In addition, since the heat transfer sheet 24 is also provided between the LED substrate 20 and the bottom portion 413, heat can be efficiently transferred from the LED substrate 20 to the apparatus main body 403.

(Fourth modification)
The illumination device 104 shown in FIG. 10 is the same as the illumination device 101 shown in FIG. 7 except for the light diffuser 301. The light diffusing body 301 is a light-transmitting resin containing a light diffusing material and is formed in a hollow hemispherical shape (dome shape), and has an effect of diffusing transmitted light.
As described above, the same effect as that of the lighting device 101 can be obtained even when the lighting device 104 in which the lens 30 of the lighting device 101 shown in FIG.

(Embodiment 2)
A lighting apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS.
In FIG. 11, the same components as those in FIG. 1 and FIG. 12 in FIG. 3 and FIG.

  As shown in FIGS. 11 to 13, the lighting device 105 according to the second embodiment is provided with a heat sink 63 at the bottom 41 of the device main body 405, similarly to the lighting device 101 shown in FIG. 7. Further, the device main body 405 of the lighting device 105 has a heat radiating portion 435 extending rearward from the tip of the reflecting portion 42 and formed in a cylindrical shape having the diameter of the tip of the reflecting portion 42, so that the reflecting portion 42. As seen from the opening side, the light falls within the range of the reflecting portion 42.

  As shown in FIG. 13, the heat dissipating part 435 is formed with a vent hole 43 a along the circumferential direction at the base end part. Air that has passed through the ventilation holes 43 a from the outside of the heat radiating portion 435 enters the space between the heat radiating portion 435 and the reflecting portion 42. The air that enters through the air vent 43 a has a temperature lower than that of the air heated by the heat radiation of the heat radiation part 435 and the reflection part 42. In the downlight in which the illuminating device 105 is arranged so that the opening of the reflecting portion 42 faces downward, the vent hole 43 a provided at the base end portion of the heat radiating portion 435 is located below the device main body 405. Accordingly, the new air having a low temperature that has entered through the air vent 43a rises while taking heat from the heat radiation part 435 and the reflection part 42 along the inner peripheral surface (back surface) of the heat radiation part 435 and the back surface of the reflection part 42. Therefore, the heat radiation part 435 and the reflection part 42 can be efficiently radiated.

(Embodiment 3)
A lighting apparatus according to Embodiment 3 of the present invention will be described with reference to FIGS. In FIG. 14, the same components as those in FIG. 1 and FIG. 15 in FIG.

  As shown in FIGS. 14 and 15, in the lighting device 106 according to the third embodiment, the lighting device 105 shown in FIG. 11 is formed on the bottom 41 of the device main body 406 formed of pure aluminum in the same manner as the device main body 40. Similarly to the above, a heat sink 63 is provided. The heat radiating portion 436 extends rearward from the tip of the reflecting portion 42. Further, since the heat radiating portion 45 is formed in a cylindrical shape having the diameter of the tip of the reflecting portion 42, the heat radiating portion 436 is within the range of the reflecting portion 42 when viewed from the opening side of the reflecting portion 42.

In addition, a plurality of grooves 44 a and 44 b from the base end side to the tip end side of the heat radiating portion 436 are provided in the heat radiating portion 436 at predetermined intervals along the circumferential direction of the heat radiating portion 436. Is formed. This uneven surface can be formed from a single metal plate by forming a reflecting portion and a heat radiating portion by spatula drawing and then drawing by pressing or baffle.
In this uneven surface, the groove 44b on the inner peripheral surface side is positioned between the adjacent grooves 44a on the outer peripheral surface side, and the groove 44a on the outer peripheral surface side is positioned between the adjacent grooves 44b on the inner peripheral surface side. Yes. The heat radiating portion 45 is formed such that the outer diameter of the virtual cylindrical surface including the upper end of the groove wall of the groove 44 a is substantially equal to the diameter of the circumference of the tip portion of the reflecting portion 42. The base end side of the groove 44a is closed by being formed on an inclined surface where the groove depth gradually decreases, and the front end side is open.

Here, the formation method of the uneven | corrugated surface of the thermal radiation part 436 is demonstrated based on FIG.
First, a concave portion is formed in the upper portion, a linear convex portion corresponds to the groove 44b (see FIG. 14B) on the peripheral surface, and a concave and convex surface where the linear concave portion corresponds to the groove 44a (see FIG. 14B). Are prepared, and a substantially cylindrical polyurethane pressing jig 76 is prepared. Then, the apparatus main body 40 according to the first embodiment is disposed in the third mold 75 in the recess so that the bottom 41 and the reflection section 42 are fitted in the third mold 75. Next, the third mold 75 and the pressing jig 76 are rotated in opposite directions (see FIG. 16A).

Next, the pressing jig 76 is brought close to and brought into contact with the third mold 75 covered with the apparatus main body 40 (see FIG. 16B).
Next, by pressing the pressing jig 76 against the third mold 75, the heat radiating portion 43 of the apparatus main body 40 is deformed by the pressing force of the pressing jig 76 together with the deformation of the peripheral surface of the pressing jig 76. And is deformed by being recessed into the linear recess of the metal mold 75 (see FIG. 16C).

  Further, the pressing jig 76 is pressed against the third mold 75, and the heat radiating portion 43 of the apparatus main body 40 is pushed into the bottom of the linear concave portion of the third mold 75 so that the apparatus main body 40 is deformed. 406, and the heat radiating portion 43 becomes a heat radiating portion 436 having an uneven surface (see FIG. 16D).

Since the grooves 44a and 44b are formed in the heat radiating portion 436 of the apparatus main body 406 in this way, the surface area can be increased as compared with the heat radiating portion 43 shown in FIG. Therefore, the heat radiation function of the heat radiation part 436 can be improved.
In addition, since the groove direction of the grooves 44a and 44b is provided from the proximal end side toward the distal end side, particularly in a downlight in which the illumination device 106 is arranged so that the opening of the reflecting portion 42 faces downward. The groove directions of the grooves 44a and 44b are arranged along the vertical direction. Therefore, since the air heated by the heat radiation of the heat radiation part 436 rises vertically along the grooves 44a and 44b, the heat can be effectively radiated.

  Furthermore, by processing a single metal plate, not only can the heat radiating portion 436 be easily formed, but the groove 44b on the inner peripheral surface side is positioned between the adjacent grooves 44a on the outer peripheral surface side, Since the groove 44a on the outer peripheral surface side can be positioned between the adjacent grooves 44b on the inner peripheral surface side, the heat radiating portion 43 can be formed thin and lightweight, and the grooves 44a, A large surface area can be secured by arranging a large number of 44b.

  In addition, since the proximal end side of the grooves 44a and 44b is closed and the distal end side is open, the lighting device 106 is a downlight with the proximal end side of the grooves 44a and 44b facing down and the distal end side facing up. In some cases, the inclined surface on the base end side can be used as a heat radiating surface, and air that has risen due to heat radiating can be dissipated from the opening at the tip.

(Embodiment 4)
An illumination device according to Embodiment 4 of the present invention will be described with reference to FIGS. In FIGS. 17A to 17C and FIGS. 18A and 18B, FIGS. 14A to 14D and FIGS. Description is omitted.

  As shown in FIGS. 17 to 19, the illuminating device 107 according to the fourth embodiment implements the ventilation holes 43 a formed in the heat radiation portion 435 of the illuminating device 105 according to the second embodiment shown in FIG. 11. It is formed at a position between adjacent grooves 44a of the heat dissipating part 437 of the lighting device 106 according to the third aspect, which is the bottom surface of the groove 44b. Further, the apparatus main body 407 is formed of pure aluminum like the apparatus main body 40.

As described above, the grooves 44a and 44b and the vent holes 43a are formed in the heat radiating portion 437 of the apparatus main body 407, so that the effect of the illumination device 105 according to the second embodiment and the illumination according to the fourth embodiment are achieved. The effect of the device 106 can be obtained at the same time.
In addition, the air holes 43a are formed in the convex portions of the concavo-convex surface of the heat radiating portion 437, so that air can easily enter. Further, since the air vent 43a is formed at a position that becomes the bottom surface of the groove 44b on the reflecting portion 42 side, the air that has entered flows along the groove 44b while taking the heat of the heat radiating portion 437 toward the distal end. The heat radiation part 437 can be efficiently radiated.

(Embodiment 5)
A lighting apparatus according to Embodiment 4 of the present invention will be described with reference to FIGS. In FIG. 20, the same components as those in FIG. 11 and FIG. 21 in FIG.

  As shown in FIGS. 20 and 21, the lighting device 108 according to the fifth embodiment is provided with a heat sink 63 at the bottom 41 of the device body 408, similarly to the lighting device 105 shown in FIG. 11. The heat dissipating part 438 extends backward from the tip of the reflecting part 42. Further, since the heat dissipating part 438 is formed in a cylindrical shape having the diameter of the tip of the reflecting part 42, the heat dissipating part 438 is within the range of the reflecting part 42 when viewed from the opening side of the reflecting part 42. Further, the apparatus main body 408 is formed of pure aluminum like the apparatus main body 40.

  Further, a plurality of grooves 45 a and 45 b along the circumferential direction of the heat radiating portion 438 are provided in the heat radiating portion 438 at predetermined intervals along the circumferential direction of the heat radiating portion 438, thereby forming an uneven surface. Yes. The apparatus main body 408 having the irregular surface is formed by forming the reflecting portion 42 and the heat radiating portion 435 shown in FIG. 11 by spatula drawing from a single disk-shaped metal plate having a circular air hole 43a. After forming the main body 405, it can be formed by performing baffle processing while rotating the apparatus main body 405 around the axis. By this baffle processing, the groove 45b on the inner peripheral surface side is positioned between the adjacent grooves 45a on the outer peripheral surface side, and the groove 45a on the outer peripheral surface side is positioned between the adjacent grooves 45b on the inner peripheral surface side. Can do. The heat radiating portion 438 is formed such that the outer diameter of the virtual cylindrical surface including the upper end of the groove wall of the groove 45 a is substantially equal to the diameter of the circumference of the tip portion of the reflecting portion 42.

  Since the grooves 45a and 45b are formed in the heat radiating portion 438 as described above, the surface area can be increased as compared with the heat radiating portion 43 shown in FIG. Therefore, the heat radiation function of the heat radiation part 438 can be improved. Further, the heat radiating portion 438 can be easily formed.

  Further, the apparatus main body 408 not only can easily form the heat radiating portion 438 by processing a single metal plate, but also positions the groove 45b on the inner peripheral surface side between the adjacent grooves 45a on the outer peripheral surface side. Since the groove 45a on the outer peripheral surface side can be positioned between the adjacent grooves 45b on the inner peripheral surface side, the heat radiating portion 438 can be formed thin and lightweight, and the groove can be formed on the inner peripheral surface side and the outer peripheral surface side. A large surface area can be secured by arranging a large number of 45a and 45b.

  As shown in FIGS. 20 and 21, the heat radiating portion 438 has a vent hole 43 a formed in the base end portion along the circumferential direction. Air that has passed through the ventilation holes 43 a from the outside of the heat radiating portion 438 enters the space between the heat radiating portion 438 and the reflecting portion 42. The air that enters through the air vent 43 a has a temperature lower than that of the air heated by the heat radiation of the heat radiation part 438 and the reflection part 42. Therefore, in the downlight in which the lighting device 108 is arranged so that the opening of the reflecting portion 42 faces downward, the low-temperature air flows along the inner peripheral surface (back surface) of the heat radiating portion 438 and the back surface of the reflecting portion 42. Since the heat is dissipated while removing heat from the heat radiation part 438 and the reflection part 42, the heat radiation part 438 and the reflection part 42 can be efficiently dissipated.

Although the present embodiment has been described above, the present invention is not limited to this. For example, in this Embodiment 3-5, since the groove | channel is formed by carrying out the baffle process of one metal plate, the groove | channel of the front surface and back surface of a thermal radiation part appears on the surrounding surface alternately. However, by forming the grooves by cutting, the front and back grooves can be formed at the same position, or only one of the grooves can be formed.
Moreover, although the opening part is formed in the circular shape by the spatula drawing process, the reflection part 42 can also be formed by press work, and may be polygonal shape or different shape in that case.
In addition to using the concave and convex surface of the heat radiating portion as a groove, protruding convex portions and concave concave portions can be provided at predetermined intervals, or annular fins can be provided on the outer peripheral surface and the inner peripheral surface. Even in this case, the size of the entire apparatus can be suppressed if it is within the range of the reflection part as viewed from the opening side of the reflection part.
Further, in the first to fifth embodiments, the outer diameter of the heat radiating portion is formed to be substantially equal to the diameter of the distal end portion of the reflecting portion, but the heat radiating portion is contracted from the base end portion toward the distal end portion. Even if formed, the size of the entire apparatus can be suppressed.

  The lighting device and the manufacturing method thereof according to the present invention are suitable for spotlights, floor stands, and other various lighting devices, and are particularly suitable for downlights.

DESCRIPTION OF SYMBOLS 10,101-108 Illuminating device 20 LED board 21 Base board 211 Wiring pattern 212 Through-hole 22 LED
23, 24 Heat transfer sheet 30 Lens 301 Light diffuser 31 Guide hole 32 Groove 33 Inner circumferential total reflection surface 34 Front transmission surface 35 Front total transmission surface 36 Outer transmission surface 40, 402, 403, 405-408 Device Main body 41, 412, 413 Bottom 41a Hole 42 Reflection part 42a Opening part 43, 435-438 Heat radiation part 43a Vent hole 44a, 44b Groove 45a, 45b Groove 61-64 Heat sink 64a Protrusion part 4 Aluminum plate 71 Rotary table 72 First Mold 72a Circular flat surface 72b Inclined surface 72c Ring-shaped flat surface 73 Roller 74 Second mold 74a Bottom surface 74c Outer peripheral surface 75 Third mold

Claims (8)

  A reflective portion that reflects light from the light source forward by an inclined surface that surrounds the light source, and extends rearward from the tip of the reflective portion, and the range of the reflective portion as viewed from the opening side of the reflective portion An illuminating device comprising a heat dissipating part that fits in the housing.   The lighting device according to claim 1, wherein the device main body including the reflecting portion and the heat radiating portion is formed of pure aluminum on which an oxide film is formed by alumite treatment.   The lighting device according to claim 2, wherein an uneven surface is formed on the heat radiating portion.   The lighting device according to claim 3, wherein the uneven surface is formed with a plurality of grooves from a base end side to a tip end side of the heat radiating portion along a circumferential direction of the heat radiating portion.   The lighting device according to claim 3, wherein the uneven surface is formed with a plurality of circumferential grooves of the heat radiating portion along an extending direction of the heat radiating portion.   The lighting device according to claim 1, wherein the heat radiating portion is provided with a vent hole.   The lighting device according to claim 6, wherein the vent hole is provided at a proximal end portion of the heat radiating portion. A method of manufacturing an illuminating device having an apparatus main body including a reflecting portion that reflects light from the light source forward by an inclined surface that surrounds the light source, and a heat radiating portion that dissipates heat generated by the light source,
Using a first mold in which a bottom part on which the light source is disposed and a peripheral surface corresponding to the inclined surface of the reflecting part is formed, the metal plate is squeezed by spatula drawing, and the first mold Transferring the mold surface and processing the bottom and the reflecting portion;
The metal plate to which the mold surface of the first mold is transferred extends rearward from the concave portion corresponding to the bottom portion and the inclined surface, and the tip portion of the reflecting portion, and is viewed from the opening side of the reflecting portion. Then, using a second mold formed with an outer peripheral surface corresponding to the heat dissipating part that falls within the range of the reflecting part, narrowing down by spatula drawing, transferring the mold surface of the second mold, and The manufacturing method of the illuminating device characterized by including the process of processing a thermal radiation part.

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