JP2010251248A - Heat sink for led lighting and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sink for LED lighting, a production efficiency of which is good, and which does not takes a lot of space, and can effectively lower a temperature of an LED. <P>SOLUTION: In the heat sink for LED lighting, a body 1 is formed in a shape of a shade, and a bottom 2 of the body 1 is formed flat so that shade tips 3 form radial projections, and inside surfaces 8 form reflective surfaces. The bottom 2 of the heat sink for LED lighting serves as an LED substrate-fixing section 2 for fixing an LED substrate, the radial projection at the top side forms a heat radiating fin section 3, and the reflective surface of the inside surface 8 forms a reflector section 8. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat sink for LED lighting and a method for manufacturing the same.

  Conventionally, products that use incandescent lamps and fluorescent lamps as lighting fixtures have become commonplace, but in recent years they have been replaced by incandescent lamps and fluorescent lamps, and light emitting diodes (hereinafter referred to as “LEDs”) with long life and good luminous efficiency. Lighting fixtures using ”are rapidly spreading.

  On the other hand, the LED is broken if the light emission efficiency decreases due to heat generation during light emission or the temperature of the LED itself becomes too high. Moreover, the sealing resin installed on the surface of the LED is also vulnerable to high heat, and if the sealing resin deteriorates, the light transmittance is lowered. In addition, since the LED itself is dispersed, the LED needs to be condensed for efficient illumination. Therefore, when using an LED as a lighting fixture, first provide a part for fixing the LED substrate, and then collect heat radiation fins as a heat sink to reduce the rise in heat generation temperature during LED emission, and LED light. Reflectors for illuminating are respectively provided (Patent Documents 1 and 2).

Japanese Patent Laying-Open No. 2005-166578 (FIG. 4) Utility Model Registration No. 3097333 (FIGS. 3 and 4)

  However, in the prior art, since the LED substrate fixing portion, the heat radiating fin, and the reflector are separately provided, each process is required to manufacture them, and the manufacturing efficiency is low and the cost is increased. In addition, a space for mounting the radiating fin and the reflector is required, and the overall shape of the lamp becomes bulky and large.

  The present invention was devised in view of the above-described problems of the prior art, and aims to provide a heat sink for LED lighting that is effective in manufacturing, is not bulky, and can effectively lower the temperature of the LED. Is.

  For this reason, the heat sink for LED lighting according to the present invention is formed so that the main body is formed in a shade shape, the bottom thereof is formed flat, the tip of the shade shape is a radial protrusion, and the inner surface is a reflection surface. It is characterized by.

  The shade shape as used in the present application refers to any shape that can be a reflector in a lighting fixture and has an opening at the tip, and of course includes the shape of the bowl shown in the embodiment, but not only that, but also a truncated cone shape or It includes a truncated pyramid shape, a cylindrical shape, a rectangular tube shape, and a shape having a slightly deeper depth.

  By the way, in general light bulb type LED lighting, the heat sink has a three-dimensional shape in consideration of installing an incandescent light bulb. As a method for producing such a three-dimensional heat sink, there are a die casting method and an extrusion method.

  The die casting manufacturing method is a manufacturing method in which a molten metal is poured into a three-dimensional mold, and a three-dimensional heat sink can be easily manufactured. On the other hand, aluminum suitable for the die casting method has poor heat dissipation efficiency due to its poor thermal conductivity due to its material, as represented by ADC12. Also, in the die casting method, solidification starts as soon as the molten metal is poured into the mold, so that it is difficult to produce a thin and long product that is difficult to cope with a fine shape.

  The extrusion manufacturing method is a manufacturing method in which aluminum in a semi-molten state is heated to an appropriate temperature and extruded into a predetermined mold shape, and a more complicated shape that cannot be manufactured by a die casting method can be manufactured. Furthermore, since aluminum suitable for the extrusion manufacturing method has good thermal conductivity in terms of material, as typified by A6063, heat dissipation efficiency is good. On the other hand, since it is rod-shaped after extrusion, additional processing such as lathe is required to make it a three-dimensional shape.

  As described above, the die casting manufacturing method and the extrusion manufacturing method, which are conventional methods for manufacturing a three-dimensional heat sink, have advantages and disadvantages. Under such a premise, the present inventor has found a method capable of producing the heat sink according to the present invention efficiently, at a low cost, and with high quality by using an extrusion method.

  For this reason, in the manufacturing method of the heat sink for LED lighting according to claim 1 of the present invention, a rod-like extruded material having radial protrusions formed on the outer periphery of a cylinder is cut into a predetermined thickness and formed into a plate shape, A plate-shaped extruded material is placed on a cap-shaped mold and pressed with a pressing mold with a flat tip to produce a cap-shaped heat sink body with a flat bottom, a radial projection at the tip, and a reflective surface on the inner surface. It is characterized by this.

  Since the bottom of the LED lighting heat sink is flat, it becomes an LED substrate fixing portion for fixing the LED substrate, the radial protrusion on the tip side becomes a heat radiating fin portion that functions as a heat sink, and the reflection surface on the inner surface becomes a reflector portion . Therefore, the heat sink according to claim 1 is formed as an integrated type having both the LED substrate fixing portion, the heat radiating fin portion, and the reflector portion. Therefore, it can manufacture efficiently and the whole lighting fixture will not be bulky. In addition, since the LED substrate fixing part and the heat radiating fin part are molded from a single member, the temperature of the LED is more effectively lowered.

  According to the method for manufacturing a heat sink according to claim 2, since it is not necessary to add additional heat radiation fins to the plate-like extruded material with a lathe or the like, it can be efficiently manufactured and the material cost can be suppressed. Moreover, the heat conductivity of a radiation fin part can be made high by using the aluminum material suitable for an extrusion manufacturing method, and can thermally radiate efficiently. Furthermore, since the aluminum surface in contact with the stamping die is smoothed by pressing, the reflection efficiency of the reflector portion can be increased. Therefore, the heat sink according to claim 1 having the above-mentioned remarkable effect can be manufactured efficiently, at a low cost, and with a high quality.

It is explanatory drawing of the embodiment of this invention, FIG. 1 (a) is a top view of the heat sink which concerns on this invention, FIG.1 (b) is a front view of the heat sink which concerns on this invention. It is explanatory drawing which shows the procedure which manufactures a heat sink main body, FIG. 2 (a) is a schematic diagram which shows the state before pressurization, FIG.2 (b) is an end elevation which shows the state at the time of pressurization. FIG. 3 (a) is a plan view and FIG. 3 (b) is a front view of a plate-like extruded material obtained by an extrusion manufacturing method. 4 (a) and 4 (b) are end views showing an embodiment of a heat sink according to the present invention. It is a figure which shows one example of the light bulb type lighting fixture which installed the heat sink which concerns on this invention.

  Specific embodiments of the invention according to the present application will be described with reference to the drawings. Of course, the present invention is not limited to the following embodiments.

  The heat sink for LED illumination of this embodiment is applied to a light bulb type lamp as shown in FIG. The present invention is premised on a bulb-type lighting fixture using such an LED, and can of course be applied even when the insulating portion or the base is incorporated in the ceiling, side wall, floor, or the like.

  FIG. 1 (a) is a plan view of a heat sink according to the present invention, and FIG. 1 (b) is a front view of the heat sink according to the present invention, in which 1 is a heat sink body, 2 is a heat sink bottom, and 3 is a shade. The heat sink front end portion, which is the shape front end, 8 indicates the inner surface of the heat sink.

  The heat sink body 1 is formed in a bowl shape like a bowl, and its bottom 2 is formed flat to fix the LED substrate, and is configured in a circular plane in this embodiment. Further, radial protrusions are formed on the heat sink tip 3 on the opening side. The heat sink inner side surface 8 is formed in a curved surface having a predetermined curvature as a reflecting surface. The inner surface 8 is not limited to a curved surface but may be a flat surface.

  In this embodiment, the LED substrate is fixed to the heat sink bottom 2 (hereinafter, this heat sink bottom is also referred to as “LED substrate fixing portion”), and when the LED emits light, the light is condensed by the heat sink inner side surface 8 (hereinafter referred to as “LED heat sink”). The inner surface of the heat sink is also called a “reflector part”). Also, the heat generated by the LED is conducted to the entire heat sink body 1, and the radial projections at the heat sink tip 3 serve as fins to efficiently dissipate heat (hereinafter, this heat sink in which the radial projections are formed). The tip is also called “radiating fin”.

  FIG. 2 is an explanatory view showing a procedure for manufacturing the heat sink body 1 described above, FIG. 2 (a) shows a state before pressurization, FIG. 2 (b) shows a state during pressurization, 4 represents a pressing mold, 5 represents a cap-shaped mold, and 6 represents a plate-shaped extruded material.

  The pressing die 4 is formed in a tapered shape with a thin tip, and the tip is formed in a circular flat shape. The tapered portion is formed in a curved surface with a predetermined curvature so that the heat sink inner side surface 8 becomes a reflecting surface. Note that the tapered portion is not limited to a curved surface, and may be formed in a flat surface. A recess corresponding to the shade shape of the heat sink body 1 is formed in the shade shape 5. Note that the cap-shaped mold 5 may be a truncated cone, truncated pyramid, cylindrical, rectangular tube, or a shape that is slightly deeper.

  The plate-like extruded material 6 is an aluminum material formed by the above-described extrusion manufacturing method, and FIGS. 3 (a) and 3 (b) show one embodiment. In this embodiment, a mold for obtaining a rod-shaped extruded material having radial protrusions formed on the outer periphery of a cylinder is used. After the rod-shaped extruded material is obtained using the mold, the extruded material is cut into a predetermined thickness. The result is a plate-like extruded material 6 shown in FIG. The number of radial protrusions is 24 in this embodiment, but may be increased or decreased as appropriate according to the application.

  Hereinafter, the press working process according to the present invention will be described with reference to FIG. A stamping die 4 is provided at the top, and a cap-shaped die 5 is installed at the bottom correspondingly. The plate-shaped extruded material 6 is placed on the cap-shaped mold 5 and then pressed by pressing the pressing mold 4 against the plate-shaped extruded material 6. The pressed plate-like extruded material 6 has the shape of this embodiment shown in FIG.

  Further, as shown in FIGS. 4 (a) and 4 (b), one or a plurality of holes 7 may be formed in advance in an extrusion process on a plate-like extruded material 6 used for pressing. By forming the hole 7, the resistance during pressing is reduced and the load can be reduced. By reducing the load, it is possible to reduce the equipment cost and the size of the die of the cap-shaped mold 5, and it is possible to mold the heat sink by a single press process. Furthermore, the subsequent step of providing a hole for wiring can be omitted.

  As described above, the heat sink main body 1 shown in FIG. 1 is an integrated type that combines the LED substrate fixing portion 2, the heat radiating fin portion 3, and the reflector portion 8, so that it can be efficiently manufactured. The entire lamp is not bulky, and a small lamp can be molded. In addition, since the LED substrate fixing portion 2 and the heat radiation fin portion 3 are molded from one member, the temperature of the LED can be effectively lowered.

  According to the method of manufacturing the heat sink main body 1, since it is not necessary to add additional heat radiation fins to the plate-like extruded material with a lathe or the like, it can be efficiently manufactured and the material cost can be suppressed. Further, by using aluminum suitable for the extrusion manufacturing method, the heat conductivity of the heat dissipating fin portion 3 can be increased, and heat can be efficiently dissipated. Furthermore, since the aluminum surface in contact with the stamping die is smoothed by pressing, the reflection efficiency of the reflector portion 8 can be increased. When it is desired to make the surface smoother, aluminum vapor deposition may be performed. As described above, according to the above method, the heat sink main body 1 having a remarkable effect can be manufactured efficiently, at low cost, and with high quality.

  As described above, the present invention is not limited to the above-described form. If the form satisfies the structure of the claims, the shape of the extrusion mold, the pressing mold, the cap-shaped mold, etc. may be changed as appropriate. Naturally, it belongs to the technical scope.

  The present invention is applicable to a bulb-type lighting fixture to which an LED substrate is applied.

1 Heat sink body
2 Heat sink bottom
3 Heat sink tip (shade tip)
4 Stamping die
5 Shade type
6 Extruded plate
7 holes
8 Inside surface of heat sink

Claims (2)

  A heat sink for LED lighting, wherein the main body is formed in a shade shape, the bottom portion is formed flat, the shade tip is formed in a radial projection, and the inner surface is a reflection surface.   A rod-shaped extruded material having radial projections formed on the outer periphery of a cylinder is cut into a plate shape by cutting to a predetermined thickness, and the plate-shaped extruded material is placed on a cap-shaped mold and the tip is flat. 2. A method of manufacturing a heat sink for LED lighting according to claim 1, wherein the heat sink body is formed by pressing to form a shade heat sink main body having a flat bottom, a radial protrusion at the tip, and a reflecting surface at the inner surface.

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