JP2012043585A - Bulb-type led lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bulb-type LED lamp with a structure suitable for simplification of product assembly and improvement in heat radiation.SOLUTION: The bulb-type LED lamp is provided with a metallic case 2 with an LED substrate 13 mounting LEDs 14, an integrated inner case 4 in which an insulating inner case 3 arranged inside the metallic case 2 and a base 1 are integrally structured, and a driving circuit 11 arranged inside the integrated inner case 4 for driving the LEDs 14. The integrated inner case 4 is equipped with an inner case metal part 5 arranged in a length direction in members of the insulating inner case 3, and the inner case metal part 5 is thermally and electrically connected with a cylindrical metal part 1a of the base.

Description

  The present invention relates to a bulb-type LED lamp, and more particularly to a bulb-type LED lamp having a structure suitable for simplifying product assembly and improving heat dissipation.

  In recent years, bulb-type LED lamps have begun to spread rapidly in homes, and the market size is expanding. Along with this, there is a demand for a more inexpensive part selection and smart circuit configuration, and a structure with easy product assembly and good heat dissipation.

  A light bulb-shaped LED lamp has an outer material made of metal such as aluminum inserted in an electronic component such as an LED light source or a drive circuit. For safety, the metal casing must be electrically insulated from the electronic components inside. For example, an insulating member such as an insulating sheet or an inner case made of a resin material having an insulating performance is used as the metal casing and the electronic component. It keeps electrical insulation between. This type of bulb-type LED lamp is disclosed in, for example, Japanese Patent Application Laid-Open No. 2009-37995.

JP 2009-37995 A

  An object of the present invention is to provide a bulb-type LED lamp having a structure suitable for simplifying product assembly and improving heat dissipation.

In order to achieve the above object, the present invention provides the following bulb-type LED lamp.
(1) An integrated inner case in which an LED board on which an LED is mounted is disposed, an insulating inner case disposed in the metallic casing, and a base, and an integrated inner case. A driving circuit for driving the LED disposed inside the case, and the integrated inner case has an inner case metal portion disposed in a longitudinal direction in a member of the insulating inner case, A light bulb shaped LED lamp in which an inner case metal part is thermally and electrically connected to a cylindrical metal part of the base.
(2) The bulb-type LED lamp according to (1), wherein the inner case metal part and the cylindrical metal part of the base are integrated with the same material.
(3) The light bulb shaped LED lamp according to (1) or (2), wherein the inner case metal part is disposed outside the cylindrical metal part of the base as viewed from the longitudinal central axis of the integral inner case. .
(4) The bulb-type LED lamp according to any one of (1) to (3), wherein the insulating inner case has an opening for passing a wiring connecting the drive circuit and the inner case metal part. .
(5) The bulb-type LED lamp according to any one of (1) to (4), wherein the inner case metal part has an uneven part on an outer peripheral part thereof.
(6) The bulb-type LED lamp according to any one of (1) to (5), wherein the inner case metal part has a cylindrical shape corresponding to the cylindrical metal part of the base.

  ADVANTAGE OF THE INVENTION According to this invention, the lightbulb-type LED lamp which has a structure suitable for the simplification of a product assembly and a heat dissipation improvement can be provided. This is because, for example, an insulating inner case made of resin is integrally molded with the base, so that the base and the inner case become one part, the number of parts can be reduced, and the assembly can be simplified. The improved heat dissipation can be obtained by thermally connecting the formed metal to the metal part of the base.

It is a figure which shows an example of the prior art of a lightbulb-type LED lamp. (A), (b) is a figure which shows one Example of the lightbulb-shaped LED lamp which concerns on this invention. It is a figure which shows the other Example of the lightbulb-type LED lamp which concerns on this invention. It is a figure which shows the other Example of the lightbulb-type LED lamp which concerns on this invention. It is a figure which shows the other Example of the lightbulb-type LED lamp which concerns on this invention.

  Hereinafter, embodiments of the light bulb shaped LED lamp according to the present invention will be described, but prior art will be described.

  FIG. 1 is a diagram showing an example of a prior art of a bulb-type LED lamp. The lamp includes a metal casing 2 made of, for example, aluminum, which is a product outer shell, a radiator 12 disposed on one side of the metal casing 2, and an LED substrate disposed on the radiator 12. 13, a plurality of LEDs (light emitting diodes) 14 mounted on the LED substrate 13, a translucent cover fixed to the metal housing 2 so as to cover the LED substrate 13 on which the LEDs 14 are mounted, and a metal housing 2, the base 1 disposed on the other side, the insulating inner case 3 disposed inside the metal housing 2 and extending into the base 1, and the LED 14 disposed inside the insulating inner case 3. A driving circuit 11 that connects the driving circuit 11 to the cylindrical metal part 1a of the base, and a wiring 9b that connects the driving circuit 11 to the top soldering part 1b of the base. The base 1 is disposed on the metal housing 2 via an insulator 8, and the cylindrical metal part 1 a is caulked and fixed to the insulating inner case 3 by the base caulking part 10. That is, the base 1 and the insulating inner case 3 are configured as separate parts, and the base 1 is fixed to the insulating inner case 3 by caulking the cylindrical metal portion 1 a of the base covering the insulating inner case 3. As another method not using the insulating inner case 3, a sheet-like insulating material to be inserted inside the metal housing 2 and a ring that fixes the base 1 and is electrically insulated from the metal housing 2. It can also comprise and comprise a shape-like insulating material. Embodiments of a light bulb shaped LED lamp according to the present invention will be described below.

  2 (a) and 2 (b) are diagrams showing an embodiment of a light bulb shaped LED lamp according to the present invention. In the following drawings, the same reference numerals as those in FIG. 1 denote the same or corresponding parts as those in FIG. As shown in FIG. 2A, the lamp includes a metal housing 2 on which an LED substrate 13 on which LEDs 14 are mounted is disposed, an insulating inner case 3 and a base 1 disposed in the metal housing 2. The integrated inner case 4 and the driving circuit 11 for driving the LED 14 disposed inside the integrated inner case 4 are provided. The integrated inner case 4 has an inner case metal part 5 disposed in the longitudinal direction in the member of the insulating inner case 3, and the inner case metal part 5 is thermally and electrically connected to the cylindrical metal part 1a of the base. Connected.

  In this embodiment, the inner case metal part 5 and the cylindrical metal part 1a of the base are integrated with the same material, but this is not limitative. In the present embodiment, the thicknesses of both are the same, but the thickness is not limited to this, and the thicknesses of both may be changed. Moreover, although the cylindrical metal part 1a of a nozzle | cap | die is not represented in a figure, it is formed in the screw shape so that it can be screwed in a light bulb socket. The same applies to the following figures. Furthermore, the insulating inner case 3 can be provided with an opening 6 through which the wiring 9 a connecting the drive circuit 11 and the inner case metal part 5 is passed. Moreover, the inner case metal part 5 can have a cylindrical shape corresponding to the cylindrical metal part 1a of the base.

  FIG. 2B is a diagram showing the relationship between the integrated inner case 4 and the metal housing 2. The integrated inner case 4 integrally constitutes the insulating inner case 3 and the base 1 as described above. The inner case metal part 5 and the cylindrical metal part 1a of the base are integrated, and are formed of a material such as copper, for example. An insulating flange 16 is provided at the boundary between the inner case metal part 5 and the cylindrical metal part 1a of the base. When the integrated inner case 4 is inserted into the metal casing 2, the integrated inner case 4 is inserted until the flange portion 16 hits the end of the metal casing 2 as shown in FIG. The At this time, it is preferable that the outer periphery of the integrated inner case 4 is in contact with the inside of the metal housing 2. Further, it is preferable that the tip of the integrated inner case 4 is in contact with the heat radiating body 12. The outer periphery and tip of the integrated inner case 4 are the outer periphery and tip of the insulating inner case 3, and the inner case metal part 5 disposed in the member of the insulating inner case 3 is not exposed. Here, the material of the insulating inner case 3 is, for example, resin, but is not limited thereto. The inner case metal part 5 is electrically insulated from the metal housing 2 by covering the outer periphery and the tip of the inner case metal part 5 with an insulating resin material.

  In general, the heat generated in the light bulb-shaped LED lamp is radiated by the metal housing 2. In this embodiment, the heat generated by the LED 14 is transferred to the insulating inner case 3 via the LED substrate 13 and the radiator 12. Heat transmitted in the drive circuit 11 is also transmitted to the insulating inner case 3, and is transmitted to the inner case metal portion 5 disposed in the member, and is radiated through the cylindrical metal portion 1a of the base. Further, by using the integrated inner case 4, the assembly of the bulb-type LED lamp does not require the base 1 and the inner case 3 to be incorporated as individual parts, and the number of parts can be reduced, thereby contributing to a reduction in manufacturing cost. be able to.

  Thus, the heat generated in the LED 14 and the drive circuit 11 can be radiated through the inner case metal part 5 and the base 1. In the range in which the insulating inner case 3 has a resin thickness that can ensure insulation, the inner case metal part 5 can be freely set in size, and the larger the size of the inner case metal part 5, the higher the heat dissipation function. The inner case metal part 5 is formed of a metal material having good heat dissipation, such as copper, and can greatly improve the heat dissipation performance. As an example, when the integrated inner case 4 having the inner case metal part 5 having a thickness of 0.57 mm and copper is compared with the conventional structure, the thermal conductivity of copper is 398 W / m · ° C., the thermal conductivity of the resin material Assuming 1.4 W / m · ° C., the thermal resistance is 1.52 ° C./W in the conventional structure, whereas it is 0.99 ° C./W in the integrated inner case 4, improving heat dissipation. I understand that. When compared with 7 W as an example of power supply of a bulb-type LED lamp, the conventional structure has a temperature of about 10.6 ° C. and the integrated inner case 4 has a temperature of about 6.9 ° C., and the latter has a heat of about 3.7 compared to the former. The temperature can be lowered.

  An input voltage fed from the base 1 is applied to the inner case metal part 5. By providing the insulating inner case 3 with the opening 6 that exposes the inner case metal part 5, the wiring to the drive circuit 11 can be connected to the inner case metal part 5 in the metal housing 2. Power can be supplied to Conventionally, there are cases where the wiring terminals of the drive circuit are electrically connected by soldering to the fitting portion between the base 1 and the inner case 3, but due to restrictions on the arrangement of internal electronic components, etc. However, when it is difficult to assemble the product, the assembly can be simplified by the present invention. Further, since the electrical connection is performed inside the cylindrical integrated inner case 4, there is an effect that the soldering trace is not visible on the outer periphery of the base and the appearance is improved.

  FIG. 3 is a diagram showing another embodiment of a light bulb shaped LED lamp according to the present invention. This lamp is different from that shown in FIG. 2 in that the inner case metal part 5 has a cylindrical metal part of the base viewed from the central axis in the longitudinal direction of the integrated inner case 4 (corresponding to the longitudinal direction of the wiring 9b in this figure). It is in the point arrange | positioned outside 1a, and is the same as that of what is shown in FIG. According to the present embodiment, there is an advantage that the installation space of the drive circuit 11 can be expanded. That is, as shown in FIG. 3, the boundary portion between the cylindrical metal portion 1a of the base and the inner case metal portion 5 is bent to the metal housing 2 side, so that the size of the base 1 is driven as it is. The installation space for the circuit 11 can be increased.

  FIG. 4 is a diagram showing another embodiment of a light bulb shaped LED lamp according to the present invention. The lamp differs from that shown in FIG. 2 in that the inner case metal part 5 is formed as a separate part from the cylindrical metal part 1a of the base, and in other respects that shown in FIG. It is the same. In this case, the inner case metal part 5 is thermally and electrically connected to the cylindrical metal part 1a of the base by caulking the cylindrical metal part 1a of the base covering the inner case metal part 5.

  In this embodiment, the cylindrical metal part 1a and the inner case metal part 5 are separate parts, and the base 1 is fixed to the insulating inner case 3 at the time of assembly, and the cylindrical metal part 1a of the base is caulked to increase the adhesion strength. It is also possible to fix. The integrated inner case 4 is inscribed in the cylindrical shape of the metal housing 2. The structure of the integrated inner case 4 is such that the inner case metal part 5 and the cylindrical metal part 1a of the base are in contact with each other at the part where the inner case metal part 5 is inscribed in the base 1, and the heat transmitted to the inner case metal part 5 is Heat is dissipated through the base 1, thereby improving the heat dissipation performance. In the present invention, the integrated inner case 4 is insulated around the inner case metal part 5 by an insulating inner case 3 made of, for example, resin, so that it is not necessary to prepare a separate insulating material, thereby simplifying product assembly. Can do.

  FIG. 5 is a view showing another embodiment of the light bulb shaped LED lamp according to the present invention. This lamp is different from that shown in FIG. 3 in that the inner case metal portion 5 has an uneven portion such as a jagged portion on the outer peripheral portion thereof, and is otherwise the same as that shown in FIG. According to this embodiment, there is an advantage that the contact area between the insulating inner case 3 and the inner case metal part 5 is increased, and the heat dissipation performance can be improved.

  In the present embodiment, as shown in the figure, the adhesion strength between the resin inner case 3 and the inner case metal part 5 can be improved by providing uneven parts such as jagged edges on the outer periphery of the inner case metal part 5. it can. Since the base 1 is loaded when the bulb is removed, in the prior art, the base 1 and the inner case 3 are caulked and fixed to the outer periphery of the base to increase the adhesion strength to reduce the influence on the load at the time of removal. According to the present invention, since the adhesion strength can be improved by the above-described structure, the caulking and fixing to the outer periphery of the die is not necessary, and the product assembly can be simplified. In addition, the heat dissipation effect can be improved by increasing the surface area of the metal portion with a jagged structure.

  The present invention relates to a bulb-type LED lamp, and more particularly to a bulb-type LED lamp having a structure suitable for simplifying product assembly and improving heat dissipation, and has industrial applicability.

DESCRIPTION OF SYMBOLS 1 Base 1a Cylindrical metal part 1b Top soldering part 2 Metal housing 3 Inner case 4 Integrated inner case 5 Inner case metal part 6 Opening part 8 Insulator 9a, 9b Wiring 10 Cap crimping part 11 Drive circuit 12 Radiator 13 LED board 14 LED
15 Translucent cover 16 Buttocks

Claims (6)

  A metal casing on which an LED board on which an LED is mounted is disposed; an integrated inner case in which an insulating inner case and a base disposed in the metal casing are integrally formed; and an inner side of the integrated inner case A drive circuit for driving the LED disposed on the inner case metal, the integral inner case having an inner case metal portion disposed in a longitudinal direction in a member of the insulating inner case, and the inner case metal A bulb-type LED lamp having a portion thermally and electrically connected to the cylindrical metal portion of the base.   The light bulb shaped LED lamp according to claim 1, wherein the inner case metal part and the cylindrical metal part of the base are integrated with the same material.   The bulb-type LED lamp according to claim 1 or 2, wherein the inner case metal portion is disposed outside a cylindrical metal portion of the base as viewed from a longitudinal central axis of the integrated inner case.   The bulb-type LED lamp according to any one of claims 1 to 3, wherein the insulating inner case has an opening for passing a wiring connecting the drive circuit and the inner case metal part.   The light bulb shaped LED lamp according to any one of claims 1 to 4, wherein the inner case metal part has an uneven part on an outer peripheral part thereof.   The light bulb shaped LED lamp according to any one of claims 1 to 5, wherein the inner case metal part has a cylindrical shape corresponding to the cylindrical metal part of the base.

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