JP2017174828A - Lighting device, heat sink and light-emitting element substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device that can suppress an increase in the whole length while acquiring sufficient heat radiation effect.SOLUTION: A lighting device 10 includes: a light-emitting element substrate 2; a heat sink 1; and a blower 3. The light-emitting element substrate 2 is implemented with a light-emitting element 21. The heat sink 1 has a cylindrical shape having an opening at each end thereof. The light-emitting element substrate 2 is disposed on at least an outside surface of the heat sink 1. The blower 3 is capable of blowing air from one opening to the other opening of the heat sink 1.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a lighting device, a heat sink, and a light emitting element substrate.

  In recent years, various light bulbs using light emitting diodes (LEDs) have been developed as illumination devices that replace conventional incandescent bulbs and fluorescent lamps. In such an LED bulb, since it is necessary to consider replacement with a conventional lighting device, the size of the LED bulb is often limited. For this reason, in the said LED bulb | ball, it is necessary to perform the thermal radiation for satisfying the performance in the determined magnitude | size.

  In particular, in the case of an LED bulb for replacing an incandescent bulb, the size of the incandescent bulb to be replaced is specified, and it is necessary to increase the light emitting area in order to suppress the uncomfortable feeling at the time of replacement. It has been.

  As a solution to the problem of heat dissipation, an illuminating device including an efficient LED cooling means in which a heat sink and a blower are combined has been proposed (Patent Document 1).

JP 2012-199181 A

  However, in the lighting device described in Patent Document 1, although the heat dissipation effect is sufficient, the dimension in the longitudinal direction increases.

  Accordingly, an object of the present invention is to provide a lighting device that can suppress an increase in the total length while obtaining a sufficient heat dissipation effect, and a heat sink and a light emitting element substrate used therefor.

In order to achieve the above object, the lighting device of the present invention comprises:
Including a light emitting element substrate, a heat sink, and a blower;
A light emitting element is mounted on the light emitting element substrate,
The heat sink is cylindrical with openings at both ends,
The light emitting element substrate is disposed on at least an outer surface of the heat sink,
The air blower can blow air from one opening of the heat sink to the other opening.

The heat sink of the present invention is
Used in the illumination device of the present invention,
It has a cylindrical shape with openings at both ends.

The light emitting device substrate of the present invention is
Including a light emitting element, an electrode and a substrate,
The substrate includes a plurality of light emitting element arrangement portions and electrode arrangement portions,
The light emitting element and the electrode are connected by a circuit,
The plurality of light emitting element arrangement portions are arranged in a state where the neighbors are connected in parallel,
The substrate can be bent into a substantially cylindrical shape with both ends opened by bringing both ends of the light emitting element arrangement portion in the parallel arrangement direction close to each other.

  According to the present invention, it is possible to provide an illumination device capable of suppressing an increase in the total length while obtaining a sufficient heat dissipation effect, and a heat sink and a light emitting element substrate used therefor.

FIG. 1A is a perspective view of an example of the heat sink of the present invention as viewed from above, and FIG. 1B is a perspective view of an example of the heat sink of the present invention as viewed from below. 2A to 2C are perspective views of another example of the heat sink of the present invention as seen from above. FIG. 3A is a schematic plan view showing a state before an approximately cylindrical shape of an example of the light emitting element substrate of the present invention, and FIG. 3B is a light emitting element substrate shown in FIG. It is the perspective view seen from the upper direction which shows the state attached to the heat sink shown to FIG. 1 (A) and (B). 4A is an exploded side view showing an example of the structure of the lighting device of the present invention, and FIG. 4B is a cross-sectional view of the lighting device shown in FIG. It is.

  Hereinafter, a lighting device, a heat sink, and a light emitting element substrate of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following description. In addition, in the following FIGS. 1-4, the same code | symbol is attached | subjected to the same part and the description may be abbreviate | omitted. In the drawings, for convenience of explanation, the structure of each part may be simplified as appropriate, and the dimensional ratio of each part may be schematically shown, unlike the actual case.

[heatsink]
First, the heat sink of the present invention will be described. The heat sink of this invention is used for the illuminating device of this invention mentioned later. FIG. 1A is a perspective view showing an example of the heat sink of the present invention as viewed from above. FIG. 1B is a perspective view showing an example of the heat sink of the present invention as seen from below. As shown in FIGS. 1A and 1B, the heat sink 1 has a cylindrical shape with openings at both ends. The heat sink 1 of the present invention has a cylindrical shape with openings at both ends, so that outside air is taken into the heat sink 1 from one (upper or lower in FIGS. 1A and 1B) and the other ( In FIGS. 1A and 1B, the air can be exhausted from the opening in the lower or upper direction, and the heat dissipation effect is excellent.

  Examples of the material for forming the heat sink 1 include aluminum and its alloys, magnesium and its alloys, iron and its alloys, copper and its alloys, titanium and its alloys, and the like. If magnesium and its alloy are used, the weight can be further reduced. If iron and its alloy are used, manufacturing cost can be further reduced. If copper and its alloy are used, the heat dissipation characteristics can be further improved. If titanium and its alloy are used, the strength can be further improved. Further, the material for forming the heat sink 1 may be, for example, a resin containing a heat conductive filler. Examples of the resin include polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polycarbonate (PC), polyamide (PA), polyphenylene sulfide (PPS), polymethyl methacrylate (PMMA), and the like.

  As shown in FIG. 1B, the heat sink 1 of the present invention preferably has a thermal diffusion member 1a that is inclined at least partially on the side surface and protrudes from the inner wall of the inclined side surface. By having the heat diffusing member 1a, the surface area of the heat sink 1 is increased, and the heat dissipation effect is excellent. In FIG. 1B, a plurality of pin members are shown as the heat diffusing member 1a, but the heat diffusing member 1a may be a fin (feather) member or the like. Further, the heat sink 1 of the present invention may be used in the lighting device of the present invention described later, and only needs to have a cylindrical shape having openings at both ends, and may have a cylindrical shape shown in FIG. 2B may be a combination of a cylinder and a part of a cone, or may be a polyhedron shown in FIG.

[Light Emitting Element Substrate]
Next, the light-emitting element substrate of the present invention will be described with reference to FIG. FIG. 3 (A) is a schematic plan view showing a state before being bent into a substantially cylindrical shape as an example of the light emitting element substrate of the present invention. 3B is a perspective view seen from above showing a state in which the light emitting element substrate shown in FIG. 3A is attached to the heat sink 1 shown in FIGS. 1A and 1B.

  As shown in FIG. 3A, the light emitting element substrate 2 includes a light emitting element 21, electrodes (anode 22 and cathode 23), and a substrate 24. The substrate 24 includes eight light emitting element arrangement portions 25a to 25h and two electrode arrangement portions 26a and 26b. The light emitting element 21 and the electrode are connected by a circuit (not shown). Eight light emitting element arrangement | positioning parts 25a-25h are arrange | positioned in the state in which the adjoining mutually connected in parallel. The location where the electrode placement portions 26a and 26b are formed is not particularly limited, but is preferably the central portion of the substrate 24 as shown in FIG. In the light-emitting element substrate of the present invention, the number of light-emitting element arrangement portions and electrode arrangement portions is not limited to the example illustrated in FIG. In the example shown in FIG. 3A, the anode 22 and the cathode 23 are arranged in independent electrode arrangement portions 26a and 26b, respectively, but the anode 22 and the cathode 23 are arranged together in one electrode arrangement portion. It may be.

  As will be described later, the substrate 24 may be formed using any material as long as it can be bent into a substantially cylindrical shape with both ends opened. Examples of the material for forming the substrate 24 include polyimide and silicone, and polyimide is particularly preferable.

  Examples of the light emitting element 21 include an LED, an organic EL, an inorganic EL, and the like, and an LED is preferable. Although LED is not specifically limited, A conventionally well-known thing can be used, but it is preferable that it is white LED. The light emitting element 21 is mounted on a wiring pattern formed on the substrate 24 excellent in thermal conductivity. In the light emitting element substrate 2, the light emitting element 21 may be included in, for example, a silicone resin, and a phosphor may be dispersed in the silicone resin. In such an embodiment, for example, white light can be obtained by using the light emitting element 21 as a blue LED and the phosphor as a combination of a yellow phosphor or a red / green phosphor. Moreover, white light can also be obtained by using the light emitting element 21 as a near-ultraviolet LED (UV-LED) and the phosphor as a combination of red, green, and blue phosphors (RGB phosphor).

  The light emitting element substrate 2 of the present invention is bent into a substantially cylindrical shape with both ends opened as shown in FIG. 3 (B) by bringing both ends of the light emitting element arrangement portion in the parallel arrangement direction close to each other. The heat sink 1 shown in FIGS. 1A and 1B can be attached. The method for attaching the light emitting element substrate 2 to the heat sink 1 is not particularly limited, and for example, the light emitting element substrate 2 can be attached using a double-sided tape, an adhesive, or the like. For example, by attaching a double-sided tape having substantially the same shape as the light emitting element substrate 1 on the back surface of the light emitting element substrate 1 and winding it around the heat sink 1, it can be easily attached.

[Lighting device]
Next, referring to FIG. 4, the case of using the heat sink 1 (hereinafter referred to as “heat sink 1”) to which the light emitting element substrate 2 shown in FIG. The apparatus will be described. FIG. 4A is an exploded side view showing an example of the configuration of the lighting device of the present invention. FIG. 4B is a cross-sectional view of the lighting device illustrated in FIG. As shown in FIGS. 4A and 4B, the lighting device 10 includes a housing (a base 6, a power supply member cover 5 and an optical cover 7), a heat sink 1, a blower 3, and a power supply. Member 4. The casing and the power supply member 4 are arbitrary constituent members and may not be included in the lighting device 10, but are preferably included.

  The housing is configured by arranging a base 6, a power supply member cover 5 and an optical cover 7 in this order. One end of the power supply member cover 5 (the lower end in FIGS. 4A and 4B) is fitted to the base 6. The other end of the power supply member cover 5 (the upper end in FIGS. 4A and 4B) is engaged with one end of the optical cover 7 (the lower end in FIGS. 4A and 4B). ing. The optical cover 7 is formed using a light transmissive material. The power supply member cover 5 may be formed using a light transmissive material, or may be formed using a material other than the light transmissive material. The optical cover 7 and the power supply member cover 5 may be formed as one member using a light transmissive material. As the optical cover 7, the power supply member cover 5, and the base 6, known covers and bases for lighting devices may be used.

  Within the power supply member cover 5, one end side of the power supply member 4 and the heat sink 1 is sequentially formed from the base 6 side (the lower side in FIGS. 4A and 4B) (FIG. 4A). And in (B), a part of lower side is arrange | positioned, and the air blower 3 is arrange | positioned inside the one end side (lower side in FIG. 4 (A) and (B)) of the heat sink 1. FIG. The other end of the heat sink 1 (the upper side in FIGS. 4A and 4B) is the opposite side of the base 6 of the power supply member cover 5 (the upper side in FIGS. 4A and 4B). Protruding. The illumination device 10 is configured by arranging the optical cover 7 so as to cover the other end side of the heat sink 1 protruding from the power supply member cover 5 (the upper side in FIGS. 4A and 4B). Has been. However, the blower 3 may be arranged at any location inside the housing as long as it can blow air from one opening of the heat sink 1 to the other opening. In A) and (B), it may be arranged on the upper side).

  The power supply member 4 is a member for supplying the power supplied to the base 6 from the outside of the illumination device 10 to the light emitting element 21 and the blower 3, and a known power supply member for the illumination device may be used. . As described above, the power supply member 4 is an arbitrary component, and when the power supplied from the outside of the illumination device 10 is directly supplied from the base 6 to the light emitting element 21 and the blower 3, the illumination according to the present invention. It does not have to be included in the device. The blower 3 will be described later.

  The power supply cover 5 has a plurality of openings 51 arranged in the circumferential direction on the side wall opposite to the base 6 (the upper side in FIGS. 4A and 4B), and the base 6 side (FIG. 4 (A) and 4 (B) have a plurality of openings 52 arranged in the circumferential direction on the lower side wall. In the illuminating device 10 shown in FIGS. 4A and 4B, when the blower 3 is operated to blow air to the base 6 side (lower side in FIGS. 4A and 4B), FIG. As shown by the arrows in FIG. 4, the atmosphere outside the lighting device 10 flows into the lighting device 10 from the opening 51, whereby the gas inside the optical cover 7 is opposite to the base 6 of the heat sink 1 (FIG. 4A). And in (B), it is sent into the inside of the heat sink 1 from the opening on the upper side. The gas sent into the heat sink 1 is warmed by the heat generated by the light emitting element radiated by the heat diffusing member 1a, and the bottom of the heat sink 1 on the base 6 side (in FIGS. 4 (A) and 4 (B)) Side) opening to the blower 3. The gas sent to the blower 3 passes through the power supply member 4 and is discharged from the opening 52 to the outside of the lighting device 10.

  As shown to FIG. 4 (A) and (B), it is preferable that the side wall of the said housing | casing has two or more openings 51 and 52 connected with the inside of the heat sink 1 from the heat dissipation effect improving more. However, the number of openings in the side wall of the housing may be one because the gas inside the lighting device 10 and the atmosphere outside the lighting device 10 can be interchanged.

  As the blower 3, for example, a commercially available product may be used. It is preferable that the blower 3 can reverse the blowing direction at regular intervals. By using such a blower 3, an airflow in the direction opposite to that shown by the arrow in FIG. 4 (B) can be generated, whereby the base 6 side inside the power supply member cover 5 (FIG. 4 ( In A) and (B), dust can be prevented from accumulating on the lower side.

  According to the illumination device of the present invention using the heat sink 1 and the blower 3, it is possible to suppress an increase in the total length while obtaining a sufficient heat dissipation effect. For example, in the illumination device 10 shown in FIGS. 4A and 4B, the total length is 77 mm shorter than the total length 81 mm of a commercially available 75-type mini-krypton lamp, and the total luminous flux is 1000 lm, which is equivalent to the 75-type mini-krypton lamp. Is possible.

  The present invention has been described above with reference to the embodiments. However, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  According to the present invention, it is possible to provide an illumination device capable of suppressing an increase in the total length while obtaining a sufficient heat dissipation effect. The lighting device of the present invention can be used for a wide range of applications.

DESCRIPTION OF SYMBOLS 1 Heat sink 1a Thermal diffusion member 2 Light emitting element substrate 3 Blower 4 Power supply member 5 Power supply member cover 6 Base 7 Optical cover 10 Illuminating device 21 Light emitting element 22, 23 Electrode 24 Substrate 25a-26h Light emitting element arrangement | positioning part 26a, 26b Electrode placement section

Claims (11)

Including a light emitting element substrate, a heat sink, and a blower;
A light emitting element is mounted on the light emitting element substrate,
The heat sink is cylindrical with openings at both ends,
The light emitting element substrate is disposed on at least an outer surface of the heat sink,
The lighting device, wherein the blower can blow air from one opening of the heat sink to the other opening. A part or all of the side surface of the heat sink is inclined,
The heat sink has a heat diffusion member protruding from an inner wall of the inclined side surface.
The lighting device according to claim 1. Furthermore, including a housing,
The housing includes a base at one end, and an opening on the side wall,
Inside the housing, the heat sink in which the light emitting element substrate is arranged at least on the outer surface, and the blower are arranged,
One opening of the heat sink is located on the opposite side of the base of the housing, and the other opening of the heat sink is located on the base side of the housing;
The lighting device according to claim 1. The side wall of the housing has openings at two or more places communicating with the inside of the heat sink.
The lighting device according to claim 3. By the blower, it is possible to blow air from the other opening of the heat sink to one opening,
The illumination device according to any one of claims 1 to 4. The light emitting element is an LED;
The illumination device according to any one of claims 1 to 5. It is used for the lighting device according to any one of claims 1 to 6,
A heat sink characterized by being cylindrical with openings at both ends. A part or all of the side surface is inclined,
A heat diffusion member protruding from the inner wall of the inclined side surface,
The heat sink according to claim 7. Including a light emitting element, an electrode and a substrate,
The substrate includes a plurality of light emitting element arrangement portions and electrode arrangement portions,
The light emitting element and the electrode are connected by a circuit,
The plurality of light emitting element arrangement portions are arranged in a state where the neighbors are connected in parallel,
A light emitting element substrate characterized in that the substrate can be bent into a substantially cylindrical shape with both ends opened by bringing both ends of the light emitting element arrangement portion in a parallel arrangement direction close to each other. The electrode placement portion is formed in the central portion of the substrate,
The light emitting device substrate according to claim 9. The light emitting element is an LED;
The light emitting element substrate according to claim 9 or 10.

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