JP2009176925A - Electric bulb type light emitting diode lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric bulb type light emitting diode lighting fixture of excellent emission efficiency and long life. <P>SOLUTION: The electric bulb type light emitting diode lighting fixture comprises a heat radiation plate 2 on which light emitting diode elements 1 are mounted, a circuit board 3 on which electronic components are mounted, and a cover member 4 which houses the heat radiation plate 2 and the circuit board 3, and a part of which is made from a translucent member through which the light emitted from the light emitting diode elements 1 transmits. The circuit board 3 is arranged away from the heat radiation plate 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light bulb type light emitting diode illumination device.

  A light emitting diode (LED) element has features such as long life, low power consumption, and light weight compared to a filament light bulb. In recent years, a light emitting diode element that can be used in place of a filament light bulb is used. The bulb-type lighting device used has attracted attention.

  The light-emitting diode element has a characteristic that the temperature rises by emitting heat at the time of light emission, but generally the light-emitting efficiency decreases as the temperature rises. In addition, the life of the light-emitting diode element is shortened when it is damaged by high temperature. For this reason, an illuminating device using a light emitting diode element needs to be configured to suppress an increase in temperature of the light emitting diode element during light emission.

  Patent Document 1 discloses a light bulb-type light-emitting diode illuminating device configured to suppress an increase in temperature of a light-emitting diode element during light emission.

  In addition, the bulb-type light-emitting diode illuminating device can freely control brightness, color, etc. by arranging a circuit board inside, and can exhibit various functions compared to filament bulbs. There is a merit in the point that can be done.

FIG. 3 is a cross-sectional view showing the inside of the cover member of the light bulb type light emitting diode illuminating device related to the present invention. This bulb-type light-emitting diode illuminating device has a heat radiating plate 102 that emits heat generated when the light-emitting diode element 101 emits light, and a circuit board 103 disposed in contact with the heat radiating plate 102 inside the cover member 104. is doing.
Japanese Patent Laid-Open No. 2001-243809

  In the light bulb type light emitting diode illuminating device shown in FIG. 3, since the circuit board 103 is in contact with the heat sink 102, the electronic components mounted on the circuit board 103 are damaged by the heat generated by the light emitting diode element 101 during light emission. The life may be shortened by receiving. At the same time, the circuit board 103 prevents the heat dissipation of the light emitting diode element 101 by the heat dissipation plate 102, leading to a decrease in the light emission efficiency of the light emitting diode element 101 and a shortened life.

  Then, an object of this invention is to provide the light-emitting diode illuminating device which is excellent in luminous efficiency and has a long lifetime.

  In order to achieve the above object, a light bulb type light emitting diode illuminating device of the present invention includes a heat sink on which a light emitting diode element is mounted, a circuit board on which an electronic component is mounted, and the heat sink and the circuit board accommodated therein. A light-emitting diode illuminating device having at least a portion made of a translucent member that transmits light emitted from the light-emitting diode element, wherein the circuit board is positioned away from the heat sink Is arranged.

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in luminous efficiency and can provide the light-emitting diode illuminating device with a long lifetime.

Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a cross-sectional view showing the inside of a cover member of a light bulb type light emitting diode illuminating device according to a first embodiment of the present invention. The bulb-type light-emitting diode illuminating device according to the present embodiment includes a light-emitting diode element 1 that emits light when energized, a heat-radiating plate 2 that is mounted with the light-emitting diode element 1 and emits heat generated when the light-emitting diode element 1 emits light. A circuit board 3 on which electronic components (not shown) for controlling the light emitting diode element 1 are mounted, and a cover member 4 in which the light emitting diode element 1, the heat sink 2 and the circuit board 3 are housed. ing. The cover member 4 includes a holding member 5 that holds the outer peripheral portion of the circuit board 3 therein.

  The cover member 4 includes a front part 4a, an intermediate part 4b, and a rear part 4c. The front part 4a and the rear part 4c are formed in a substantially hemispherical shape, and the intermediate part 4b is formed in a substantially cylindrical shape. At least a part of the front portion 4a is made of a translucent member that transmits light emitted from the light emitting diode element 1. The intermediate part 4b and the rear part 4c are made of, for example, a metal material having excellent heat dissipation. The heat radiating plate 2 is disposed at the end of the intermediate portion 4b on the front portion 4a side, and the circuit board 3 is disposed at the end of the intermediate portion 4b on the rear portion 4c side. A base 6 is attached to the rear end of the rear portion 4c.

  The light emitting diode element 1 is mounted on the surface of the heat radiating plate 2 on the front portion 4a side of the cover member 4, and the light emitting diode element 1 is supplied with electric power from an external power source (not shown) through the circuit board 3. Flashes.

  In this bulb-type light-emitting diode illuminating device, the heat sink 2 and the circuit board 3 are respectively arranged at both ends of the intermediate part 4b of the cover member 4, and the circuit board 3 is arranged on the rear part 4c of the cover member 4 of the heat sink 2. Since the light-emitting diode element 1 is separated from the side surface, the heat generated by the light-emitting diode element 1 during light emission is suppressed from being transmitted to the circuit board 3. In this way, it is possible to prevent the life of the electronic component mounted on the circuit board 3 from being shortened due to damage. At the same time, the circuit board 3 does not hinder the heat radiation of the light emitting diode element 1 by the heat radiating plate 2, so that the light emitting diode element 1 is prevented from decreasing in luminous efficiency and shortening its life due to high temperature.

  Further, in this bulb-type light-emitting diode illuminating device, the heat radiating plate 2 is disposed in the intermediate portion 4b where the cross-sectional area of the internal space of the cover member 4 is substantially maximum, and the cross-sectional area of the internal space of the intermediate portion 4b. And substantially the same area. Thereby, since the light emitting surface on which the light emitting diode element 1 can be mounted is widely provided, high performance such as high luminance and various illumination designs can be made.

  Moreover, in the light bulb type light emitting diode illuminating device, since various functions are realized, it is necessary to mount electronic components and the like corresponding to the respective functions on the circuit board. On the other hand, since the internal space of the cover member of the light-emitting diode illuminating device is narrow, the circuit boards that can be arranged are limited to those having a small board surface area. Accordingly, since the number and size of electronic components that can be mounted are limited, the functions that can be exhibited are limited accordingly. Therefore, it is desirable that the area of the substrate surface of the circuit board of the light bulb type light emitting diode illuminating device is as large as possible.

In the light bulb type light emitting diode illuminating device according to the present embodiment, the intermediate portion 4b of the cover member 4 is formed in a substantially cylindrical shape, and the outer peripheral portion of the circuit board 3 is provided at the rear end portion of the intermediate portion 4b. By being directly held by the holding member 5, the board surface of the circuit board 3 has a large area like the light emitting surface of the heat sink 2. Thereby, since many electronic components etc. can be mounted on the circuit board 3, higher functionality can be achieved. Further, since the circuit board 3 is arranged at a position separated from the heat sink 2, electronic components can be mounted not only on the face of the circuit board 3 on the base 6 side but also on the face of the heat sink 2. Therefore, further enhancement of functionality can be achieved.
(Second Embodiment)
FIG. 2 is a cross-sectional view showing the inside of a cover member of a light bulb type light emitting diode illuminating device according to a second embodiment of the present invention.

  The light-emitting diode illuminating device according to this embodiment includes a light-emitting diode element 11 that emits light when energized, a heat-radiating plate 12 that is mounted with the light-emitting diode element 11 and that emits heat generated when the light-emitting diode element 11 emits light. And a circuit board 13 on which electronic components for controlling the light emitting diode element 11 and the like are mounted, and a cover member 14 in which the light emitting diode element 11, the heat radiating plate 12, and the circuit board 13 are accommodated. The bulb-type light-emitting diode illuminating device according to the present embodiment is configured in the same manner as the bulb-type light-emitting diode illuminating device according to the first embodiment except for the configuration described below.

  The cover member 14 is formed in a substantially spherical shape, and includes a front portion 14a and a rear portion 14c. The heat radiating plate 12 is disposed at the boundary between the front portion 14a and the rear portion 14c of the cover member 14, and the circuit board 13 is disposed at a position away from the heat radiating plate 12 in the rear portion 14c. The cover member 14 includes a holding member 15 that holds the outer peripheral portion of the circuit board 13 therein.

  In this bulb-type light-emitting diode illuminating device, the heat dissipation plate 12 and the circuit board 13 are arranged apart from each other, thereby shortening the life due to damage to electronic components and the like, and the light-emitting diode element 11 becomes high temperature. This prevents the light emission efficiency from being lowered and the life from being shortened.

  Further, in this bulb-type light-emitting diode illuminating device, the heat radiating plate 12 is disposed at a boundary portion between the front portion 14a and the rear portion 14c where the cross-sectional area of the internal space of the cover member 14 is substantially maximum. Accordingly, a light emitting surface on which the light emitting diode element 11 can be mounted is widely provided.

  Further, the light bulb type light emitting diode illuminating device does not have an intermediate portion in the cover member unlike the light bulb type light emitting diode illuminating device according to the first embodiment, but the circuit board 13 is provided on the cover member 14. By being directly held by the holding member 15, the board surface of the circuit board 13 has a substantially maximum installable area in the portion where the circuit board 13 is disposed inside the cover member 14. ing.

It is sectional drawing which shows the inside of the cover member of the lightbulb type light emitting diode illuminating device which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the inside of the cover member of the light bulb type light emitting diode illuminating device which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the inside of the cover member of the lightbulb type light emitting diode illuminating device relevant to this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Light emitting diode element 2,12 Heat sink 3,13 Circuit board 4,14 Cover member 4a, 14a Front part 4b Intermediate | middle part 4c, 14c Rear part 5,15 Holding member 6 Cap

Claims (8)

A heat dissipation plate on which the light emitting diode element is mounted, a circuit board on which electronic components are mounted, the heat dissipation plate and the circuit board are accommodated therein, and at least a part of the transparent plate transmits light emitted from the light emitting diode element. In a light bulb type light emitting diode illuminating device having a cover member composed of a light member,
The light bulb type light emitting diode illuminating device, wherein the circuit board is disposed at a position separated from the heat radiating plate.   The bulb-type light-emitting diode illuminating device according to claim 1, wherein an outer peripheral portion of the circuit board is held in contact with the cover member.   The bulb-type light-emitting diode illuminating device according to claim 1, wherein the cover member includes a holding member that holds an outer peripheral portion of the circuit board.   The heat sink is disposed at a position where the cross-sectional area of the internal space of the cover member is substantially maximum, and the surface of the heat sink on which the light emitting diode element is mounted is substantially equal to the cross-sectional area. The bulb-type light-emitting diode illuminating device according to claim 1, comprising:   The bulb-type light-emitting diode illuminating device according to claim 4, wherein the cover member includes a cylindrical portion having the cross-sectional area, and the heat sink and the circuit board are disposed in the cylindrical portion.   The light-emitting diode illuminating device according to claim 5, wherein the heat radiating plate is disposed at an end portion of the cylindrical portion on a surface side facing the heat radiating plate of the circuit board.   The light bulb-type light-emitting diode illuminating device according to claim 5 or 6, wherein the circuit board is disposed at an end of the cylindrical portion on a surface side of the heat radiating plate facing the circuit board.   The light bulb-type light-emitting diode illuminating device according to any one of claims 1 to 7, wherein the electronic components are mounted on both surfaces of the circuit board.

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