JP2016154127A - Led lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an effective cooling in a lens case to be carried out at an LED lighting device storing LED elements within the lens case in an air-tight manner.SOLUTION: An LED lighting device 1 comprises a cylindrical lens case 2, an LED holding part 3 having LED elements actually installed therein, and a base part 4 arranged at the lens case 2. The base part 4 has a recess part 11 for storing the LED holding part 3. The lens case 2 is connected to the base part 4 under a state in which it is fitted into the recess part 11 by a connecting part 6 so as to close an internal space of the lens case 2 in an air-tight manner. The base part 4 supports a fan device 20 by supporting columns 16 so as to be formed to protrude into an outer space. The fan device 20 strikes taken air against the base part 4 to form air flow to be discharged out of a window part 30 with the supporting columns 16 being applied as side frames and each of the sides of a frame of the fan device 20 and the case part 4 being applied as an upper frame and a lower frame.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a small LED lighting device that can be worn by a person to illuminate an object.

  Conventionally, various lighting devices using LED elements with high efficiency and long life have been put into practical use. However, the lighting device using the LED element has a problem that the light emission efficiency of the LED deteriorates and the light output of the lighting device decreases and the life of the LED element is short when the temperature inside the main body case is increased by heat generated from the LED element. There is a problem of becoming.

  For this reason, conventionally, in order to cool the LED element, the LED illumination device cools the LED element by providing a plurality of fins on the back side of the substrate on which the LED element is mounted (for example, see Patent Document 1). An LED illumination device that actively cools using a fan device is also known (see, for example, Patent Document 2).

JP 2007-42755 A JP 2011-165351 A

  Among various illuminating devices using LED elements, miniaturized LED illuminating devices that are used by being worn on clothes or clothing such as glasses or headbands worn by humans are known. Such an illuminating device, for example, when mounted on a person's head, can illuminate along the direction of the person's line of sight because the direction of the face coincides with the direction of illumination of the light. It is an illumination device that is optimal for the purpose of illuminating automatically.

  However, this type of LED lighting device is reduced in size and weight so as not to become a burden when worn, and the volume capacity in the lens case that houses the LED element is also reduced. Therefore, the surface area of the illumination part in the lens case is also reduced, and the illuminance is extremely reduced when dust or water vapor enters the case and dirt or water droplets adhere to the inside of the case and the illumination surface becomes cloudy.

  In order to prevent this, in the downsized LED lighting device, in order to prevent intrusion of dust and water vapor, the LED element is sealed and accommodated in the lens case, but when the lens case with a small volume capacity is sealed, There is a problem that the temperature inside the case rises in a short time and is not suitable for long-time use. In addition, the lens that irradiates the LED light from the light weight side is almost always made of resin, and there is a possibility that the lens is damaged by heat.

  However, in order to suppress the temperature rise in the lens case, heat exchange with the outside cannot be performed even if a fin is provided on the back surface of the substrate on which the LED element is mounted in a sealed space. Also, forced cooling by outside air cannot be performed by providing a fan device.

  In view of the above, an object of the present invention is to make it possible to effectively cool the inside of a lens case in an LED illumination device in which an LED element is hermetically housed in a lens case.

  In order to solve the above problems, a cylindrical lens case having first and second end surfaces and provided with an illumination lens on the first end surface, an LED holding portion on which an LED element is mounted, and the lens A base portion provided on the second end surface side of the case, a recess formed in the base portion to store the LED holding portion, and the lens case fitted into the recess at the second end surface A coupling portion that seals the inner space of the lens case by maintaining the coupled state with the base portion, a support column that is formed to protrude from the base portion to the external space, and the support column A fan device supported by the frame, wherein the fan device applies intake air to an end surface of the base portion opposite to the concave portion, and the adjacent support pillars are side frames, and the frame And the base Each other of the sides that are facing to provide an LED lighting device for forming an air flow discharged from the window as the upper and lower frames.

  In order to solve the above-described problem, a cylindrical lens case having first and second end surfaces and provided with an illumination lens on the first end surface, an LED holding unit on which an LED element is mounted, A base portion provided on the second end surface side of the lens case and having a plurality of ventilation paths toward the lens case on the outer surface, and the base portion is formed so as to accommodate the LED holding portion. A concave portion, a coupling portion that seals the internal space of the lens case by fitting the lens case into the concave portion at the second end surface and coupling the lens case to the base portion; and the base A fan device that is disposed to face the unit, and a housing that has openings at both ends and accommodates the base unit and the fan device therein, and the base unit includes the ventilation unit Placed in the housing with the road facing one of the openings The fan device provides an LED lighting device which is disposed an air flow for exhausting the air to take through said ventilation passage from the other of said openings in the housing to form in the housing.

  At this time, by fixing the substrate to the bottom surface of the concave portion with a screw, heat generated from the LED element is transmitted to the base portion via the screw. Furthermore, if the tip of the screw penetrates the bottom surface of the recess and protrudes from the back surface of the base portion, heat exchange with air can be performed even at the protruding portion of the screw.

  And it is good to make the surface of the edge part which opposes the said fan apparatus in the said base part into an uneven surface. Thereby, since the area which contacts the air sent from a fan apparatus increases, the heat dissipation effect from the end surface of a base part can be heightened.

  Further, in the base portion, the surface of the end opposite to the end where the concave portion is formed protrudes toward the fan device, and the shape of the side surface of the protrusion at that time is stepped or It is good to comprise so that it may become a substantially taper shape. Thereby, since the air taken in by the fan device flows along the side surface of the protruding portion and is discharged from the window portion, effective heat exchange of the base portion is performed.

  Further, by forming a plurality of grooves on the side surface of the base portion, the grooves become fins, and heat can be effectively radiated from the side surfaces. And by forming this groove in the direction from the fan device toward the lens case, a part of the air that has escaped from the window flows along the groove, so that the air flow on the side surface is promoted and the groove The heat exchange efficiency due to is further increased.

  In addition, heat from the LED holding portion is efficiently absorbed by the base portion by applying a heat-dissipation coating or a heat absorption coating including black alumite treatment on the outer surface of the base portion and the inner surface of the recess. Thus, the heat dissipation efficiency is further increased. Black alumite treatment uses a treatment solution that does not contain environmentally hazardous substances.

  In the frame, a notch portion may be formed on a side surface substantially communicating with the support pillar. By doing so, the air flow along the side surface of the frame is promoted without being taken into the impeller 20a, and at the same time, the air flow taken into the impeller 20a and discharged from the window portion is also promoted. The heat dissipation effect by the fan device becomes more effective.

  According to the present invention, since the concave portion is formed in the base portion that seals the inside of the lens case, and the LED holding portion on which the LED element is mounted is accommodated in the concave portion, the heat generated by the LED element is efficiently generated in the base portion. Communicated. Then, the fan device supported by the support pillar provided so as to protrude outward from the back surface of the base part effectively radiates heat from the base part by heat exchange with the air flow that exhausts the air taken in from the window part. Therefore, a highly durable LED lighting device is realized.

The sectional side view of the LED lighting apparatus which concerns on Embodiment 1 of this invention is shown. Explanatory drawing which decomposed | disassembled the LED lighting apparatus which concerns on embodiment of this invention for every component is shown. The perspective view explaining the part of the fan apparatus of an LED lighting apparatus is shown. The one end surface of the base part of a LED lighting apparatus is shown with a top view. In order to explain the cross-sectional shapes of various grooves formed on the side surface of the base portion, the end surface of the base portion is schematically shown in a plan view. Each modification which enabled effective heat dissipation from the end surface by the side of the fan apparatus of a base part is shown with a sectional side view. The perspective view explaining the other example of a window part part is shown. The perspective view explaining another example of a window part is shown. The LED lighting apparatus of the state which attached the holding part is shown with a side view. The sectional side view of the LED lighting apparatus which concerns on Embodiment 1 of this invention is shown. The top view from the left in the LED lighting apparatus of FIG. 10 is shown. The perspective view from the right in the LED lighting apparatus of FIG. 10 is shown.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Embodiment 1>
FIG. 1 is a side cross-sectional view of a wearable LED lighting apparatus 1 that is attached to an operator's body and irradiates light to an illumination target. The LED lighting device 1 is configured by assembling the components shown in FIG.

  The lens case 2 is a substantially frustoconical cylinder, and incorporates a lens system 5 including a plurality of convex lenses for irradiating a target with light in a spot manner. A coupling portion 6 for connecting to the base portion 4 is provided at the base end portion of the lens case 2, and a spirally continuous protrusion 6 a is formed on the outer peripheral surface of the coupling portion 6.

  The LED holding unit 3 is a circular LED holding unit on which an LED package 7 including a plurality of LED chips is mounted by an adhesive, and is made of a resin or metal (including an alloy) having high thermal conductivity. As the adhesive at this time, a silicone-based adhesive having excellent thermal conductivity may be used. The LED holding portion 3 has a substantially rectangular notch 10 formed in a part of the circumference, and the lead 15 of the LED package 7 is drawn out to the notch 10.

  The rectangular base 4 is formed of a metal material such as aluminum, and is provided with a cylindrical recess 11 for accommodating the LED holding unit 3. By housing the LED holding part 3 in the recess 11, heat generated from the LED package 7 is efficiently absorbed by the base part 4. In order to further improve the heat dissipation efficiency, heat radiation coating or heat absorption coating may be applied to the outer surface of the base portion 4 and the inner surface of the recess 11. For example, in heat radiation coating, there is black alumite treatment using a treatment liquid that does not contain environmentally hazardous substances.

  And the base part 4 is equipped with the receiving port 13 for receiving the harness 24 inserted from the outside in the side surface. The harness 24 includes a power supply line to the LED package 7, a power supply line to the fan device 20 that will be apparent later, and a ground line. The harness 24 is introduced into the recess 11 through a path 26 communicating between the receiving port 13 and the recess 11. Therefore, the LED holding part 3 is arranged so that the notch 10 faces the exit side of the path 26, and the power supply line and the ground line of the LED package 7 of the harness 24 are connected to the lead 15 of the LED package 7 by soldering. The As a result, 7.2V is supplied to the LED package 7 from the outside through the harness 24 in this example, and the LED chip emits light.

  Thus, when the harness 24 is incorporated into the base portion 4, the harness 24 is inserted into the receiving port 13 while being passed through the hollow portions of the grommet 25 and the O-rings 17 and 18. Then, by fixing the grommet 25 over the receiving port 13, the O-ring 17 is locked by an annular receiving portion 19 formed on the inner peripheral wall of the receiving port 13, and the O-ring 18 is fixed to the receiving port 13. The receiving port 13 is sealed in a state where the harness 24 is passed therethrough.

  The LED holding unit 3 is fixed to the bottom surface of the recess 11 with a pair of screws 12. At this time, the LED holding unit 3 may be brought into contact with the bottom surface of the recess 11 or may be arranged with a gap. In this example, considering the ease of connecting the wire of the harness 24 and the lead 15 of the LED package 7 at the time of assembly, a gap is provided between the LED holding portion 3 and the bottom surface of the concave portion 11 to provide a screw 12. It is fixed by. The screw 12 fixes the LED holding part 3 to the concave part 11 of the base part 4 and also performs an action of radiating heat generated by the LED package 7 to the outside. In particular, when fixing with a gap between the LED holding unit 3 and the bottom surface of the recess 11, the screw 12 directly transfers the heat of the LED holding unit 3 to the base unit 4. Screws made of copper or tungsten are optimal. In the case of using copper as a material, it is advisable to apply silver plating or the like to the surface in consideration of corrosion.

  An engagement groove 11 a that engages with the protrusion 6 a of the coupling portion 6 is formed in a spiral on the inner peripheral wall of the recess 11. Therefore, the lens case 2 and the base part 4 are fastened and screwed together by fitting and rotating the coupling part 6 of the lens case 2 in the recess 11. Thereby, since the lens case 2 is sealed by the O-rings 17 and 18 with the receiving port 13 passing through the harness 24 as described above, the inside of the lens case 2 is hermetically sealed and is free of dust and moisture. Intrusion is prevented.

  Support pillars 16 for supporting the fan device 20 are provided at the four corners of the end surface opposite to the end surface where the recess 11 of the base portion 4 is provided. Since the support column 16 is formed so as to protrude from the end surface of the base part 4, it is also a heat radiating part that releases the heat absorbed by the base part 4 from the LED holding part 3 to the outside air. And the base part 4 itself is a heat radiating part that releases the heat absorbed from the LED holding part 3 to the outside air, and as shown in FIG. 4, the cross section that functions as a cooling fin on the side surface of the base part 4 is “U”. The heat radiation effect is enhanced by forming the plurality of letter-shaped grooves 29.

  As the fan device 20, a fan device having a small size having a brushless DC fan motor having a small diameter of about several tens of millimeters, a thickness of about several millimeters, and a capacity of about 3 V to 5 V is used. And the fan apparatus 20 is arrange | positioned and comprised inside the flame | frame 20a used as a wind tunnel, and is supported by the front-end | tip of the support pillar 16 with the flame | frame 20a. When the impeller 20b rotates, air is taken into the frame 20a from the outside and blown out in the axial direction. The blown air hits the end surface of the base part 4, and the adjacent support columns 16 are side frames in the frame 20 a and the base part 4, and the respective sides facing each other are the four directions. It is discharged to the outside from the window part 30 of this. Although not shown, a power supply line to the fan device 20 branched from the harness 24 and a ground line are connected to the DC fan motor, and 3V is supplied in this example.

  Notches 21 may be formed on the four side surfaces of the frame 20a of the fan device 20 from the air intake side to the exhaust side. This is because when the fan device 20 is driven to generate an air flow, a notch portion 21 is provided on the side surface of the frame 20a with respect to the air flowing along the side surface of the frame 20a without being taken into the impeller 20a. This is because if this flow is promoted, the flow of air taken into the impeller 20a and discharged from the window portion 30 is also promoted.

  The heat radiation effect of the LED lighting device 1 having the above configuration will be described. The heat generated in the LED package 7 during illumination is efficiently transmitted to the base part 4 because the LED holding part 3 on which the LED package 7 is mounted is accommodated in the recess 11 formed in the base part 4. . In this case, as described above, the screws 12 directly connecting the base part 4 and the LED holding part 3 also contribute to the heat conduction effectively.

  The end surfaces of the support pillars 16 and the base part 4 exchange heat with air by the air flow formed by driving the fan device 20 and discharged from the window part 20, so that the LED holding part 3 to the base part 4. The heat transferred to is released. On the other hand, since the groove | channel 29 acts as a fin, the base part 4 is also effectively radiating heat from the side surface. Moreover, since the flow of the air discharged from the window part 20 is promoted by the negative pressure generated by the air flowing along the side surface of the frame 20a without being taken into the impeller 20a, the support column 16, the base part 4 and the air The heat exchange efficiency of is increased.

  Further, at this time, a part of the air discharged from the window portion 30 flows in the direction of the lens case 2 from the side surface of the base portion 4, but by forming the groove 29 along this direction, Since the air flow is promoted, the heat exchange efficiency from the side surface of the base part 4 is made effective. The cross-sectional shape of the groove 29 is any one of a triangular shape, a square shape, and a semicircular shape, as schematically shown in FIGS. 5 (a), 5 (b), and (c). Also good. Further, as shown in FIG. 4 (c), the shape of the base part 4 may be a cylindrical body having a round cross section. In this case, a semicircular groove 29 is formed on the side surface. doing.

  Further, in order to enhance the heat exchange at the end face of the base part 4, the surface of this end face may be formed as an uneven surface as shown in FIG. Moreover, it is good to form not only a plane but 4 A of protrusion parts which protrude toward the fan apparatus 20 from this end surface. In this case, the protruding portion 4A is formed so that the shape of the side surface thereof is a stepped shape shown in FIG. 6B or a substantially tapered shape shown in FIG. Thereby, the air taken in by the fan device 20 flows while exchanging heat along the side surface and is discharged from the window portion 30.

  In addition to the support pillars 16 at the four corners of the end face of the base part 4, as shown in FIG. 7, the support pillars 16 a are arranged at the center of the side of the end face to increase the number of window parts 30. An air flow can be formed to enhance the cooling effect. As another modified example, as shown in FIG. 8, a crosspiece 26 is bridged along the side of the end face of the base portion 4 at the center of each of the adjacent support pillars 16, and The cooling effect is also enhanced by forming the two-stage windows 30a and 30b along the air flow.

  As shown in FIG. 9, the LED lighting device 1 includes an arm 31 that is fixedly attached to the harness 24. The arm 31 is rotatably connected to a grip portion 23 that is used when the LED lighting device 1 is attached to a wearable item such as glasses or a head belt attached to an operator's body or clothes. The gripping portion 23 is composed of a pair of gripping pieces 23 a and 23 b that are coaxially supported at their respective end portions on the arm 31, a screw 27, a spring 28, and a nut 32. The screw 27 is fixedly attached to the gripping piece 23b, and the tip of the screw shaft passes through the gripping piece 23a and is fitted to the nut 32. A spring 27 is fitted into a portion of the screw shaft between the grip piece 4a and the grip piece 4b.

  The LED lighting device 1 including the arm 31 can be worn by a person by, for example, being mounted on a spectacle frame. In this case, the gripping part 23 sandwiches the bridge part connecting both eyes with the spectacle frame between the gripping pieces 23A and 23B, and rotates the nut 26 in the tightening direction to grip the bridge part. The LED lighting device 1 is held by a spectacle frame. If the nut 28 is loosened from the gripping state, the gap between the gripping pieces 4A and 4B is opened, and the gripping portion 4 releases the gripping of the mounting portion 38. Further, in addition to the spectacle frame, a headband or a hat worn by a person can be gripped and attached by the grip portion 4.

<Embodiment 2>
FIG. 10 shows a side cross-sectional view of the LED lighting device 50 according to the second embodiment, and the same components as those of the LED lighting device 1 according to the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.

  The LED lighting device 50 includes a cylindrical lens case 2 in which the lens system 5 is housed, an LED holding unit 3, a base unit 4, a recess 7 formed in the base unit 4, a coupling unit 6, A fan device 51, a base 52 and a housing 52 that accommodates the fan device 51 are provided. However, in the present embodiment, the support column 16 in the first embodiment that also acts as a heat radiating portion (heat sink) is not provided.

  The fan device 51 is an axial flow type fan similar to the fan device 20 in the first embodiment. The casing 52 has openings 52a and 52b at both ends. As shown in FIG. 11, the opening 52a has a small DC fan motor mounting plate 54 with an impeller 53 mounted on a rotating shaft. Is fixed in a state in which its peripheral end is fitted in contact with the inner wall of the casing 52. The mounting plate 54 is provided with a plurality of exhaust ports 56 at regular intervals along the circumferential direction in which the impeller 53 rotates.

  Of the four side surfaces of the base 4 of the rectangular body, on the side surfaces other than the surface where the receiving port 13 is formed when the harness 24 is incorporated into the base 4, the ventilation path 55 is directed toward the lens case 2. A groove is formed. The base portion 4 is fixed by fitting the ventilation path 55 into the opening 52 b in parallel with the axial direction of the housing 52.

  With the above configuration, when the fan device 51 is driven, the air taken in from the opening 52 b passes through the ventilation path 55 and is sucked into the fan device 51 and exhausted from the exhaust port 56. Thereby, since the base part 4 is cooled effectively by heat exchange with the airflow which passes through a side surface, the function as a heat sink of the base part 4 increases.

  In the configuration of the second embodiment, as in the case of the first embodiment, the surface of the end portion facing the fan device 51 in the base portion 4 is an uneven surface, or the surface of the opposite end portion is the fan device. It is possible to further increase the cooling efficiency by projecting toward 51 and configuring the side surface of the projecting portion at that time to be stepped or substantially tapered.

  The present invention is not limited to the above-described embodiment, and various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 LED illuminating device 2 Lens case 3 LED holding part 4 Base part 4A Protrusion part 5 Illuminating lens 6 Coupling part 11 Recess 16 Support pillar 20 Fan apparatus 20a Frame 21 Notch part 29 Groove 30 Window part 50 LED illuminating apparatus 51 Fan apparatus 52 Case 55 Ventilation path

Claims (11)

A cylindrical lens case having first and second end faces and provided with an illumination lens on the first end face;
An LED holding unit on which the LED element is mounted;
A base portion provided on the second end face side of the lens case;
A recess formed in the base portion to accommodate the LED holding portion;
A coupling portion that seals the internal space of the lens case by holding the lens case in a state where the lens case is fitted to the recess at the second end surface and coupled to the base portion;
A support pillar formed so as to protrude from the base portion to the external space;
A fan device in which a frame is supported by the support pillar,
The fan device applies the air to be taken in to the end surface of the base portion opposite to the concave portion, and the adjacent support pillars are side frames and are opposed to each other in the frame and the base portion. An LED lighting device characterized by forming an air flow discharged from a window portion whose sides are upper and lower frames. A cylindrical lens case having first and second end faces and provided with an illumination lens on the first end face;
An LED holding unit on which the LED element is mounted;
A base portion provided on the second end surface side of the lens case, and having a plurality of ventilation paths toward the lens case on the outer surface;
A recess formed in the base portion to accommodate the LED holding portion;
A coupling portion that seals the internal space of the lens case by holding the lens case in a state where the lens case is fitted to the recess at the second end surface and coupled to the base portion;
A fan device disposed to face the base part;
A housing that has openings at both ends and accommodates the base and the fan device inside;
The base portion is disposed in the casing with the ventilation path facing one of the openings, and the fan device exhausts air taken in through the ventilation path from the other opening. An LED lighting device, wherein the LED lighting device is disposed in the housing so as to be formed in a body.   The LED lighting device according to claim 1, wherein the substrate is fixed to a bottom surface of the concave portion with a screw.   The LED lighting device according to claim 3, wherein the tip of the screw penetrates the bottom surface of the recess and protrudes into the external space.   The LED illumination device according to claim 1, wherein a surface of an end portion of the base portion facing the fan device is an uneven surface.   The surface of the end portion of the base portion that faces the fan device is projected toward the fan device, and the shape of the side surface of the protruding portion at that time is stepped or substantially tapered. The LED illumination device according to claim 1 or 2, characterized in that   The LED lighting device according to claim 1, wherein a plurality of concave portions are formed on a side surface of the base portion.   The LED lighting device according to claim 7, wherein the groove is formed in a direction from the fan device toward the lens case.   3. The LED lighting device according to claim 1, wherein the outer surface of the base portion and the inner surface of the recess are subjected to heat radiation coating or heat absorption coating including black alumite treatment. 4.   10. The LED lighting device according to claim 9, wherein the heat radiation coating is black alumite treatment using a treatment liquid that does not contain an environmental load substance.   The LED lighting device according to claim 1, wherein a notch portion is formed on a side surface of the frame that is substantially in communication with the support pillar.

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