JP5564395B2 - LED lighting device - Google Patents

Description

  The present invention relates to an illuminating device that can be used as an alternative to an existing annular fluorescent lamp by arranging a plurality of LEDs (light emitting diodes) in an annular shape and having a lightweight and excellent heat dissipation structure.

  LEDs (light emitting diodes) are rapidly spreading as lighting fixtures that replace conventional incandescent light bulbs due to their power saving and long life.

  An LED element has a problem that when a large amount of power is applied to obtain a high output, the LED element itself generates heat, and this heat generation causes a deterioration in luminance, resulting in a decrease in life. In particular, it is necessary to consider heat dissipation. .

  LED lighting fixtures of the same shape as conventional fluorescent lamps using LEDs have already been put into practical use, but when trying to ensure the same illuminance as fluorescent lamps, a large heat sink to ensure high heat dissipation In many cases, a (heat sink) is mounted, and as a result, the weight of the luminaire tends to increase compared to a conventional fluorescent lamp.

  For example, in the lighting device as disclosed in Patent Document 1, a very large heat sink is used for the LED module.

Special table 2008-518384 gazette

  In addition, as shown in FIG. 7A, when the LED illumination is formed in an annular shape, a flat substrate 10 using a metal material with high thermal conductivity such as aluminum, and the flat substrate 10 It will be composed of a large number of LED elements 11 arranged.

  As a result, the heat capacity of the LED element 11 with respect to the area of the flat substrate 10 is increased, and the heat generation causes a deterioration in luminance, resulting in a problem that the life of the LED element 11 is reduced. Therefore, as shown in FIG. 7B, a method is adopted in which a heat radiating plate (heat sink) 12 is attached to the back side of the flat substrate 10 to dissipate heat.

  However, when such a heat sink (heat sink) 12 is used, since the shape of the annular flat plate substrate 10 is a special shape, the yield of the substrate is poor, and as a result, the cost of the flat plate substrate 10 is increased. There was a problem.

  Moreover, since the heat sink 12 is a lump of metal, such as aluminum, the weight of the whole lighting equipment will become heavy. However, the lighting fixture to be attached to the fluorescent lamp fixture needs to be less than or equal to the weight defined in the Japanese Industrial Standard (JIS standard), and is desirably lighter from the viewpoint of preventing a fall accident.

  In particular, annular fluorescent lamps are often used as residential lighting (pendant lights / ceiling lights) and elevator (elevator) lighting, etc., to withstand vibration caused by sudden braking of the elevator during an earthquake or emergency stop. In particular, it is necessary to consider lightness. However, if a large heat sink 12 as shown in FIG. 7B is used, the entire lighting device is heavy, and when used as an elevator (elevator) lighting, etc., it can withstand vibrations caused by earthquakes and elevator elevators. There was a problem that it was impossible.

  Furthermore, since it is comprised from two components, the flat substrate 10 and the heat sink 12, there existed a problem that a clearance gap was easy to make and the efficiency of heat dissipation worsened. Usually, silicone grease or a heat conductive sheet is sandwiched between the gaps, and the heat conductivity of the heat conductive sheet is lower than that of metal. There was a problem that I couldn't tell to 12.

  An object of the present invention is to provide a lighter illumination device that does not require a large heat sink in an illumination device in which a plurality of LED elements are arranged in an annular shape.

  In order to solve the above-mentioned problem, an LED lighting device according to claim 1 includes a strip-like portion formed extending in the longitudinal direction, and a comb-teeth shape formed in a comb-teeth shape extending in the short direction integrally with the strip-like portion. A printed circuit board made of a metal, wherein the band-shaped portion is bent into an annular shape, and each of the comb-shaped portions is bent in three stages in a short direction, to form the band-shaped portion. A printed circuit board having a slope portion having a predetermined angle with respect to the horizontal portion, a horizontal portion that is substantially perpendicular to the belt-like portion, and a rear end portion that is substantially parallel to the belt-like portion; A pattern formed on the printed circuit board, wherein the power supply pattern comprises: a heat dissipation pad portion that contacts the belt-like portion and the comb-like portion; and a power supply pattern. The slope portion in the comb-like portion; An LED element comprising a pattern alternately formed on the horizontal portion of the comb-tooth-shaped portion adjacent to the comb-tooth-shaped portion, and an electrode and a heat radiating terminal on the lower surface portion, and formed alternately A plurality of LED elements that are attached to the power supply pattern on the slope portion and the power supply pattern on the horizontal portion and that are attached by contacting the heat dissipation terminal to the heat dissipation pad portion, and bent in an annular shape An upper case that is attached to the inner surface side of the processed belt-like portion, and stores an annular heat sink having substantially the same width as the belt-like portion, and the annular printed circuit board to which the LED element and the heat sink are attached. And a lower case and power supply means for supplying power to the LED element.

  According to the LED lighting device according to claim 1, the comb-like portion of the metal printed board is bent in three stages, and the heat dissipating pad portion that contacts the comb-like portion and the belt-like portion is provided. By bringing the heat dissipation terminal of the LED element into contact, a sufficient heat dissipation effect can be obtained even if an annular heat sink having a simple structure is used, so that the LED illumination device has high illuminance without increasing the weight of the LED illumination device. I will provide a.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the printed circuit board is formed of a metal such as aluminum or iron.

  According to the LED lighting device according to claim 2, by using a metal such as aluminum or iron having high thermal conductivity for the printed circuit board, an LED lighting device having a further higher heat dissipation effect is provided.

  In the LED lighting device according to claim 3, in addition to the configuration of the invention according to claim 1 or 2, the power supply pattern is formed on the slope portion of the comb-shaped portion of the heat dissipating pad portion. If the power supply pattern is formed on the horizontal portion of the comb tooth portion, the slope portion of the comb tooth portion is formed on the horizontal portion of the comb tooth portion. Characterized by being formed

  According to the LED lighting device of the third aspect, it is possible to increase the area of the heat dissipating pad portion, and to provide an LED lighting device having a higher heat dissipation effect.

  In the LED lighting device according to claim 4, in addition to the configuration of the invention according to any one of claims 1 to 3, the surface of the heat dissipating pad part is mirror-finished or the heat dissipating pad part Further, a separate metal plate or lens that is mirror-finished is pasted.

  According to the LED lighting device of the fourth aspect, the heat dissipating pad portion has a function as a diffusion plate that reflects the irradiation light from the LED element, and provides an LED lighting device with higher illuminance.

  According to the present invention, the comb-like portion of the metal printed circuit board is bent in three stages, and the heat dissipating pad portion that contacts the comb-like portion and the belt-like portion is provided, and the heat dissipating terminal of the LED element is provided on the heat dissipating pad portion. By making contact, a sufficient heat dissipation effect can be obtained even if an annular heat sink having a simple structure is used, so that an LED illumination device that is lightweight and has high illuminance can be provided.

It is an exploded view which shows the whole schematic structure of the LED lighting apparatus in embodiment of this invention. It is a top view which shows the metal printed circuit boards and LED element which are used for the LED lighting apparatus shown in FIG. It is a partially broken perspective view which shows the state which attached the pattern and the LED element 4 to the metal printed circuit board used for the LED lighting apparatus shown in FIG. It is a figure which shows the LED element 4 used for the LED illuminating device shown in the figure, (A) is a top view which shows the LED element 4, (B) is a bottom view which shows the LED element 4. It is a perspective view which shows the annular | circular shaped heat sink used for the LED lighting apparatus shown in FIG. It is a side view which shows the state which attached the annular heat sink shown in FIG. 5 to metal printed boards. It is a figure which shows the printed circuit board and the heat sink which attached the LED element used for the conventional LED lighting apparatus, (A) is a perspective view which shows the printed circuit board which attached the conventional LED element, (B) is the conventional It is a perspective view which shows a heat sink.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  A first embodiment of the present invention will be described with reference to FIGS. The present embodiment is an embodiment in which the present invention is applied to an LED illumination device used for an elevator or the like.

  FIG. 1 is a diagram showing an LED lighting device 1 according to this embodiment. As shown in FIG. 1, the LED device 1 of this embodiment includes a resin upper cover 2, a resin lower cover 3, a plurality of LED elements 4, and a metal print on which these LED elements 4 are mounted. A substrate 5, a metal annular heat sink 6, and a power supply substrate 7 are provided.

  The upper cover 2 and the lower cover 3 are made of a transparent or milky white plastic excellent in permeability and heat resistance. As shown in FIG. 1, the lower cover 3 is formed with a heat radiating hole 3a for radiating heat to the outside air, and the heat transmitted to the metal printed board 5 is radiated to the outside air. Furthermore, by forming the lower cover 3 from a plastic resin having a good thermal conductivity, the heat of the metal printed board 5 is also released to the lower cover 3 that is a housing.

  The metal printed board 5 is made of a metal plate having a thickness such as aluminum or iron, which has a good thermal conductivity and an appropriate flexibility. As shown in FIG. 2, the metal printed board 5 includes a band-shaped portion 5a formed extending in the longitudinal direction, and a comb-tooth-shaped portion 5b formed integrally with the band-shaped portion 5a and extending in the short direction. I have.

  As shown in FIG. 3, the comb-like portion 5b is bent in three stages, and has a slope portion 5c having a predetermined angle with respect to the belt-like portion 5a and a positional relationship substantially perpendicular to the belt-like portion 5a. It is divided into a horizontal portion 5d and a rear end portion 5e having a positional relationship substantially parallel to the belt-like portion 5a.

  The bending process of the comb-like portion 5b of the metal printed board 5 is performed after the LED elements 4 are alternately mounted on the slope portion 5c and the horizontal portion 5d as shown in FIG. In this way, the LED elements 4 are alternately mounted on the slope portions 5c and the horizontal portions 5d, and then the comb-tooth portions 5b of the metal printed board 5 are bent as described above, whereby the light emitting direction of the LED elements 4 is obtained. As shown in FIG. 3, are dispersed in a direction having a predetermined angle with respect to the band-shaped part 5 a and a direction substantially perpendicular to the band-shaped part 5 a. As a result, the LED irradiation device 1 can uniformly irradiate the irradiated space, and can suppress the occurrence of light spots.

  The metal printed board 5 can be accommodated in the upper cover 2 and the lower cover 3 by bending the belt-like portion 5a into an annular shape as shown in FIG. 1 after the bending process as shown in FIG. It has become.

  As shown in FIG. 3, a pattern 8 is formed on the surface of the metal printed board 5, and this pattern 8 has heat radiation pad portions 8 a to 8 i and a power supply pattern 8 j. The LED element 4 has a heat radiating terminal as described later, and the LED element 4 is joined to the pattern 8 by soldering the heat radiating terminal of the LED element 4 on the pattern 8.

  As shown in FIG. 5A, which is a top view, the LED element 4 includes an LED light emitting unit 4a, and as shown in FIG. 5B, which is a bottom view, the + side electrode (anode) 4b and the − side An electrode (cathode) 4c and a heat radiating terminal 4d are provided. The + side electrode (anode) 4b and the − side electrode (cathode) 4c are joined to the pattern 8 by soldering, and the heat radiating terminal 4d is joined to the heat radiating pad portions 8a to 8i of the pattern 8 by soldering. ing.

  The annular heat radiating plate 6 is formed in an annular shape by bending a long strip plate made of an alloy having good thermal conductivity and self-heat dissipation as shown in FIG. The annular heat radiating plate 6 is mounted as a supplementary part that further enhances heat dissipation when the output of the LED element 4 is further increased to obtain illuminance.

  After the metal printed board 5 is processed into an annular shape as shown in FIG. 1, the annular heat sink 6 is brought into close contact with the back surface of the band-like part 5 a of the metal printed board 5 as shown in FIG. 6. It is attached. Thus, heat dissipation is improved by attaching it in close contact with the back surface of the belt-like portion 5a of the metal printed board 5.

  Since this annular heat sink 6 has a very simple structure compared to a large heat sink (heat sink) used in conventional LED lighting fixtures, it does not significantly affect the weight of the LED lighting fixtures and is lightweight. Can be mounted as a heat sink.

  The power supply board 7 shown in FIG. 1 has a function of converting commercial AC power (AC power) into DC power (DC power) that supplies the LED element 4. Terminals for supplying power are formed on both sides in the longitudinal direction of the power supply board 7, and these terminals are joined to the ends of the pattern 8 on the metal printed board 5 to supply power to the LED elements 4. Is possible.

  According to the LED lighting device 1 of the present embodiment as described above, the mounting portion of the LED element 4 on the metal printed board 5 extends in the short direction as shown in FIG. Therefore, a large surface area can be obtained, and a high heat dissipation effect can be obtained.

  Further, since the metal printed board 5 of the present embodiment is bent as shown in FIG. 3, the direction of heat dissipation is dispersed, the heat can be efficiently dissipated into the atmosphere, and a higher heat dissipation effect can be obtained.

  Furthermore, since the LED lighting device 1 of the present embodiment includes the light-weight annular heat sink 6 having a very simple structure as compared with the conventional one, the weight of the entire lighting device is reduced, and further higher heat dissipation is achieved. An effect can be obtained.

  Moreover, in this embodiment, since the heat radiation pad parts 8a to 8i having a large area are provided in the pattern 8 on the metal printed board 5, the heat generated from the LED elements 4 is efficiently applied to the entire metal printed board 5. It can conduct heat well. As a result, an even higher heat dissipation effect can be obtained.

  These heat radiating pad portions 8a to 8i have a function of a diffusing plate that reflects light by directly mirror-finishing the surface, or by making a space for attaching a mirror-finished metal plate, optical lens, prism, or the like. I'm giving it.

  As described above, according to the present embodiment, the metal printed board 5 to which the LED element 4 is attached is formed of an elastic thin metal plate, and is formed to extend in the longitudinal direction. An annular metal printed circuit board is formed by bending the belt-like portion 5a into an annular shape because it is formed from a comb-like portion 5b that is continuous with the portion 5a and extends in the lateral direction and is formed in a comb-like shape. 5 and the yield of the metal printed circuit board 5 can be improved because it is not necessary to produce a specially shaped printed circuit board as in the prior art.

  In addition, the printed circuit board 5 is made of metal, the heat dissipating pad portions 8a to 8i having a large area are attached to the comb-shaped portion 5b having a large area, and the heat dissipating terminals 4d of the LED elements 4 are directly attached to the heat dissipating pad portions 8a to 8i Since the comb-tooth shaped portion 5b is bent in the short direction, an extremely high heat dissipation effect can be obtained as compared with the prior art.

  Furthermore, since the printed circuit board 5, the LED element 4, and the heat radiating pad portions 8a to 8i can obtain an extremely high heat radiating effect, the heat radiating plate has a lighter annular heat radiation structure that is extremely simple compared to the conventional case. Since the plate 6 can be used and, as a result, it is not necessary to add a large heat countermeasure component as in the prior art, an extremely high heat dissipation effect can be obtained while reducing the weight of the entire lighting device.

  The present invention can be used for an illumination device of an elevator (elevator).

DESCRIPTION OF SYMBOLS 1 LED illuminating device 2 Upper cover 3 Lower cover 4 LED element 4a LED light emission part 4b Radiation terminal 5 Metal printed board 5a Strip | belt-shaped part 5b Comb-tooth shaped part 6 Ring-shaped heat sink 7 Power supply board 8 Pattern 8a, 8b, 8c, 8d , 8e, 8f, 8g, 8h, 8i Heat dissipation pad

Claims (4)

A metal printed board having a strip-like portion formed extending in the longitudinal direction and a comb-like portion formed in a comb-teeth shape extending in the lateral direction integrally with the strip-like portion, wherein the strip-like portion is Each of the comb-shaped portions is bent in three stages in a short direction, and the inclined portion having a predetermined angle with respect to the strip-shaped portion, and the strip-shaped portion A printed circuit board having a horizontal portion that is in a substantially vertical positional relationship and a rear end portion that is in a substantially parallel positional relationship to the belt-shaped portion;
A pattern formed on the printed circuit board, comprising a heat dissipation pad portion that contacts the belt-like portion and the comb-like portion, and a power supply pattern, wherein the power supply pattern is A pattern formed alternately on the inclined surface portion in the comb-tooth-shaped portion and the horizontal portion in the comb-tooth-shaped portion adjacent to the one comb-tooth-shaped portion;
An LED element comprising an electrode and a heat radiating terminal on a lower surface portion, wherein the electrode is brought into contact with the alternately formed power supply pattern on the inclined surface portion and the power supply pattern on the horizontal portion, and the heat radiating pad A plurality of LED elements that are attached to the heat dissipation terminal in contact with the part;
Attached to the inner surface side of the belt-shaped portion bent into the annular shape, an annular heat sink having substantially the same width as the belt-shaped portion;
An upper case and a lower case for housing the annular printed circuit board to which the LED element and the heat sink are attached;
Power supply means for supplying power to the LED element;
LED lighting device comprising:   The LED lighting device according to claim 1, wherein the printed circuit board is made of a metal such as aluminum or iron.   When the power supply pattern is formed on the slope portion of the comb-like portion, the heat dissipating pad portion is formed on the horizontal portion of the comb-like portion, and the horizontal portion of the comb-like portion. 3. The LED lighting device according to claim 1, wherein when the power supply pattern is formed, the LED lighting device is formed on the slope portion of the comb-like portion.   The surface of the heat radiating pad portion is mirror-finished, or a separate metal plate or lens or the like that is mirror-finished is attached to the heat radiating pad portion. LED lighting apparatus of description.