JP6549397B2 - LED lighting device - Google Patents

Description

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

  2. Description of the Related Art Conventionally, various lighting devices using LED elements with high efficiency and long life have been put to practical use. However, in the lighting device using the LED element, when the temperature in the main body case becomes high due to the heat generated from the LED element, the luminous efficiency of the LED deteriorates and the light output of the lighting device decreases, and the life of the LED element is short Problems such as

  Therefore, conventionally, in order to cool the LED element, the LED lighting device performs cooling by providing a plurality of fins on the back side of the substrate on which the LED element is mounted (see, for example, Patent Document 1). Moreover, the LED lighting apparatus which cools actively using a fan apparatus is also known (for example, refer patent document 2).

JP 2007-42755 A JP, 2011-165351, A

  Among various illumination devices using LED elements, miniaturized LED illumination devices are known that are used by being worn on clothes such as glasses and headbands worn by people and clothes. For example, when such a lighting device is worn on the head of a person, it can be illuminated along the line of sight of the person because the direction in which the face is directed matches the direction in which the light is illuminated. Lighting equipment that is most suitable for lighting applications.

  However, this type of LED lighting device is reduced in size and weight so as not to be a burden when worn, and the volume capacity in the lens case for housing the LED element is also reduced. Therefore, the surface area of the illumination portion in the lens case is also reduced, and if the dust or water vapor infiltrates into the case and the dirt or water droplets adhere to the inside of the case and the illumination surface becomes cloudy, the illuminance extremely decreases.

  In order to prevent this, in the miniaturized LED lighting device, the LED element is enclosed and housed in the lens case in order to prevent the intrusion of dust and water vapor. However, when the lens case with a small volume capacity is enclosed, There is a problem that the temperature inside the case rises in a short time, making it unsuitable for long-term use. In addition, the lens that emits the LED light is mostly made of resin from the viewpoint of light weight, and there is also a possibility that the lens may be damaged by heat.

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

  From the above point of view, the present invention aims to effectively cool the inside of the lens case in the LED lighting apparatus in which the LED element is sealed and housed in the lens case.

In order to solve the said subject, the cylindrical lens case which has an 1st and 2nd end surface, and an illumination lens is provided in the said 1st end surface, LED holding part in which an LED element is mounted, and the said lens A base portion provided on the second end face side of the case, a recess formed in the base portion to accommodate the LED holding portion, and the lens case fitted to the recess at the second end face A connecting portion for sealing the inner space of the lens case by holding the state where it is connected to the base portion, a support post formed to project from the base portion to the outer space, and the support post And a screw for fixing the LED holding portion to the bottom surface of the recess and having a tip protruding through the bottom surface of the recess toward the fan device. The above Down device against the air taken into the end face and the screw opposite to the recess in the base part, with the support pillar adjacent the side frame, opposite to each other In the said base portion and said frame Provided is an LED lighting device that forms an air flow discharged from a window portion in which each side is an upper and lower frame.

Moreover, in order to solve the said subject, the cylindrical lens case which has a 1st and 2nd end surface and an illumination lens is provided in a said 1st end surface, LED holding part in which an LED element is mounted, A base portion provided on the second end face side of the lens case and having a plurality of ventilation paths directed to the lens case on the outer surface, and the base portion to receive the LED holding portion A recess, a connecting portion for sealing the inner space of the lens case by holding the lens case fitted to the recess at the second end face and being connected to the base portion; and the base A fan device disposed opposite to the part, and a screw provided to fix the LED holding part to the bottom surface of the recess and for causing the tip to penetrate through the bottom surface of the recess toward the fan device; Have openings at both ends A housing that houses the base portion and the fan device, the base portion being disposed in the housing with the air flow passage facing one of the openings, the fan being The apparatus applies the air taken in through the air passage to the end face of the base portion opposite to the recess and the screw, and forms an air flow exhausted from the other opening in the housing. Provided is an LED lighting device arranged.

  The surface of the end portion of the base portion facing the fan device may be an uneven surface. As a result, the area in contact with the air sent from the fan device is increased, so that the heat radiation effect from the end face of the base portion can be enhanced.

  Further, in the base portion, the surface of the end opposite to the end where the recess is formed is made to project toward the fan device, and the shape of the side of the protrusion at that time is stepped or It may be configured to be substantially tapered. As a result, the air taken in by the fan device flows along the side of the protrusion and is discharged from the window, so that effective heat exchange of the base is performed.

  Furthermore, by forming a plurality of grooves on the side surface of the base portion, the grooves become fins, and heat can be dissipated effectively also from the side surface. Then, by forming this groove in the direction from the fan device toward the lens case, a part of the air that has slipped out of the window flows along the groove, thereby promoting the air flow on the side surface. Heat exchange efficiency is further enhanced.

  In addition, the heat from the LED holding portion is efficiently absorbed by the base portion by applying the heat radiation coating or the heat absorption coating including the black alumite treatment to the outer surface of the base portion and the inner surface of the recess. The heat dissipation efficiency is further enhanced. The black alumite treatment uses a treatment solution that does not contain an environmentally hazardous substance.

  Further, in the frame, it is preferable to form a notch on the side surface substantially in communication with the support column. By doing so, the flow of air along the side of the frame is promoted without being taken into the impeller 20a, and the flow of air taken into the impeller 20a from the window is also promoted. The heat dissipation effect by the fan device becomes more effective.

  According to the present invention, a recess is formed in the base portion for sealing the inside of the lens case, and heat is generated by the LED element efficiently in the base portion in order to accommodate the LED holding portion in which the LED element is mounted. It is transmitted. Then, the fan device supported by the support column provided so as to project outward from the back surface of the base portion effectively dissipates heat from the base portion by heat exchange with the air flow discharging the taken-in air from the window portion Thus, a highly durable LED lighting device is realized.

The side sectional view of the LED lighting apparatus which concerns on Embodiment 1 of this invention is shown. The explanatory view which disassembled the LED lighting device concerning the embodiment of the present invention into parts is shown. The perspective view explaining the part of the fan apparatus of a LED lighting apparatus is shown. The one end surface of the base part of a LED lighting apparatus is shown by 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 face of the base portion is schematically shown in a plan view. Each modification which enabled it to thermally radiate effectively 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 is shown. The perspective view explaining the further 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 side sectional 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. Fig. 12 shows a perspective view from the right in the LED lighting device of Fig. 10;

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First Embodiment
FIG. 1 is a side sectional view showing a wear-type LED lighting device 1 which is worn on the body of an operator and irradiates light to an object to be illuminated. The LED lighting device 1 is configured by assembling the parts shown in FIG.

  The lens case 2 is a cylinder having a substantially truncated cone shape, and incorporates a lens system 5 composed of a plurality of convex lenses for spot light irradiation of an object. A joint 6 for connecting to the base 4 is provided at the base end of the lens case 2, and a helically continuous projection 6 a is formed on the outer peripheral surface of the joint 6.

  The LED holding portion 3 is a circular LED holding portion 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, it is preferable to use a silicone-based adhesive having excellent thermal conductivity. The LED holding portion 3 is formed with a substantially square notch 10 at a part of the circumference, and the lead 15 of the LED package 7 is drawn out to the notch 10.

  The rectangular base portion 4 is formed of a metal material such as aluminum or the like, and is provided with a cylindrical recess 11 for housing the LED holding portion 3. By accommodating the LED holding portion 3 in the recess 11, the heat generation from the LED package 7 is efficiently absorbed by the base portion 4. In order to further improve the heat radiation efficiency, it is preferable to apply heat radiation coating or heat absorption coating to the outer surface of the base 4 and the inner surface of the recess 11. For example, in thermal radiation coating, there is black alumite treatment using a treatment liquid containing no environmentally harmful substance.

  And the base part 4 is provided with the receiving port 13 for receiving the harness 24 inserted from the outside in the side surface. The harness 24 includes a feed line to the LED package 7, a feed line to the fan device 20 to be clarified later, and an earth line. Then, the harness 24 is introduced into the recess 11 through the path 26 communicating between the receiving port 13 and the recess 11. Therefore, the LED holding portion 3 is disposed such that the notch 10 faces the outlet side of the path 26, and the feeder line of the LED package 7 of the harness 24 and the ground wire are connected by soldering to the lead 15 of the LED package 7 Ru. As a result, 7.2 V is supplied to the LED package 7 from the outside through the harness 24 in the present embodiment, and the LED chip emits light.

  As described above, when the harness 24 is incorporated into the base portion 4, the harness 24 is inserted into the receiving port 13 while passing through the hollow portions of the grommet 25 and the O-rings 17 and 18. The O-ring 17 is locked by the annular receiving portion 19 formed in the inner peripheral wall of the receiving port 13 by covering the grommet 25 on the receiving port 13 and fixing the O-ring 17. The inlet 13 is sealed in a state where it passes through the harness 24 and is mounted in an annular groove 8 formed on the outer surface of the housing.

  The LED holding portion 3 is fixed to the bottom surface of the recess 11 by a pair of screws 12. At this time, the LED holding portion 3 may be in contact with the bottom surface of the recess 11 or may be arranged with a gap. In this example, in consideration of 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 clearance is provided between the LED holding portion 3 and the bottom surface of the recess 11. It is fixed by. The screw 12 fixes the LED holding portion 3 to the recess 11 of the base portion 4 and also functions to radiate the heat of the LED package 7 to the outside. In particular, in the case of fixing the LED holding portion 3 and the bottom surface of the concave portion 11 with a gap, the screw 12 directly transfers the heat of the LED holding portion 3 to the base portion 4. A screw made of copper or tungsten is most suitable. In the case of using copper as a material, it is preferable to apply silver plating or the like on the surface in consideration of corrosion.

  In the inner peripheral wall of the recess 11, an engagement groove 11 a that engages with the protrusion 6 a of the coupling portion 6 is formed in a spiral shape. Therefore, by fitting and rotating the coupling portion 6 of the lens case 2 in the recess 11, the lens case 2 and the base portion 4 are tightened and screwed together. As a result, the lens case 2 is sealed by the O-rings 17 and 18 in a state where the inlet 13 passes through the harness 24 as described above, so the inside of the lens case 2 is sealed and dust and moisture Invasion is prevented.

  At four corners of the end face of the base 4 opposite to the end face where the recess 11 is provided, support posts 16 for supporting the fan device 20 are provided. Since the support pillars 16 are formed so as to project from the end face of the base portion 4, the support posts 16 are also heat dissipation portions that release the heat absorbed from the LED holding portion 3 by the base portion 4 to the outside air. The base 4 itself is also a heat dissipating 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 functioning as a cooling fin on the side of the base 4 is “U”. The heat dissipation effect is enhanced by forming the plurality of V-shaped grooves 29.

  As the fan device 20, a very small-sized one provided with a brushless DC fan motor having a small size of 3 to 5 V and a thickness of several millimeters and a size of 10 several mm square 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 flame | frame 20a at the front-end | tip of the support pillar 16. As shown in FIG. When the impeller 20b rotates, air is taken in from outside into the frame 20a and blown out in the axial direction. The blown-out air strikes the end face of the base 4, and the supporting pillars 16 adjacent to each other are in the frame 20a and the base 4 in the side frame, and each side facing each other is the upper and lower four directions Is discharged to the outside from the window 30 of the Further, although not shown, the feeder line to the fan device 20 branched from the harness 24 and the ground line are connected to the DC fan motor, and in this example, 3 V is fed.

  The four side surfaces of the frame 20a of the fan unit 20 may be formed with notches 21 respectively from the air intake side to the exhaust side. The reason is that when the fan device 20 is driven to generate a flow of air, notches 21 are provided in the side surface of the frame 20a for air flowing along the side surface of the frame 20a without being taken into the impeller 20a. If this flow is promoted, the flow of air taken into the impeller 20 a and discharged from the window 30 is also promoted.

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

  Then, the end faces of the support column 16 and the base portion 4 exchange heat with the air by the air flow formed by the drive of the fan device 20 and discharged from the window portion 20, whereby the LED holding portion 3 to the base portion 4 The heat transferred to the will be released. On the other hand, since the groove 29 functions as a fin, heat dissipation from the side is also effectively performed on the base portion 4. Further, the negative pressure generated by the air flowing along the side surface of the frame 20a without being taken into the impeller 20a promotes the flow of the air discharged from the window portion 20, so that the support column 16, the base portion 4 and the air Heat exchange efficiency is enhanced.

  Furthermore, at this time, a part of the air discharged from the window 30 flows from the side surface of the base portion 4 in the direction of the lens case 2, but by forming the groove 29 along this direction, Since the flow of air is promoted, the heat exchange efficiency from the side of the base portion 4 is made effective. The cross-sectional shape of such a groove 29 is any of triangular, square and semicircular as schematically shown in (a), (b) and (c) in FIG. 5, respectively. It is also good. Further, as shown in part (c) of FIG. 4, the shape of the base 4 may be a cylindrical body having a round cross section, in which 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 portion 4, as shown in FIG. 6A, it is preferable to configure the surface of the end face as an uneven surface. Moreover, it is good to form not only a plane but the protrusion part 4A which protrudes 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 stepped as shown in FIG. 6 (b) or substantially tapered as shown in FIG. 6 (c). Thus, the air taken in by the fan device 20 flows along the side surfaces while exchanging heat, and is discharged from the window 30.

  In addition to the support posts 16 at the four corners of the end face of the base portion 4, as shown in FIG. 7, the support posts 16a are arranged at the centers of the sides of the end faces to increase the number of window portions 30, variously. An air flow can be formed to enhance the cooling effect. Further, as another modification, as shown in FIG. 8, a crosspiece 26 is bridged along the side of the end face of the base portion 4 at the central part of each of the adjacent support posts 16. Forming the two-step windows 30a and 30b along the air flow also enhances the cooling effect.

  The LED lighting device 1 includes an arm 31 fixedly attached to the harness 24 as shown in FIG. The arm 31 is rotatably connected to a gripping portion 23 used when attaching the LED lighting device 1 to wearable articles such as glasses and head belts worn on the body of the operator and clothes. The gripping portion 23 includes a pair of gripping pieces 23 a and 23 b coaxially rotatably supported by the arm 31 at one ends thereof, 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 with the nut 32. A spring 27 is fitted in a portion between the grip piece 4 a and the grip piece 4 b of the screw shaft.

  The LED lighting device 1 provided with the above-mentioned arm 31 can be worn by a person, for example, by being attached to a spectacles frame. In this case, the gripping portion 23 holds the bridge portion connecting the eyes with the eyeglass frame between the gripping pieces 23A and 23B, and rotates the nut 26 in the tightening direction to grip the bridge portion. The LED lighting device 1 is held by an eyeglass frame. And if the nut 28 is loosened from the holding | grip state, the space | interval of the holding pieces 4A and 4B will open, and the holding part 4 will cancel the holding | grip of the mounting part 38. FIG. Further, in addition to the eyeglass frame, the user can hold and attach a headband, a hat, and the like worn by a person with the holding unit 4.

Second Embodiment
FIG. 10 shows a side cross-sectional view of the LED lighting device 50 according to the second embodiment, and the same reference numerals are assigned to configurations common to the LED lighting device 1 according to the first embodiment, and the detailed description will be omitted.

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

  The fan device 51 is an axial flow fan similar to the fan device 20 in the first embodiment. The housing 52 has openings 52a and 52b at both ends, and as shown in FIG. 11, the mounting plate 54 of the small DC fan motor with the impeller 53 mounted on the rotation shaft is provided in the opening 52a. Is fixed in a state in which its peripheral end is in contact with the inner wall of the housing 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 rectangular base 4, the air passage 55 is directed toward the lens case 2 on the side other than the surface where the inlet 13 is formed when the harness 24 is incorporated into the base 4. The groove which becomes is formed. And the ventilation path 55 is inserted in the opening 52 b in parallel with the axial direction of the housing 52 and fixed to the base 4.

  With the above configuration, when the fan device 51 is driven, air taken in from the opening 52 b is sucked into the fan device 51 through the air passage 55 and exhausted from the exhaust port 56. As a result, the base unit 4 is effectively cooled by heat exchange with the air flow passing through the side surface, so the function of the base unit 4 as a heat sink is enhanced.

  Also in the configuration of the second embodiment, as in the case of the first embodiment, the surface of the end facing the fan device 51 in the base 4 is a rough surface, or the surface of the opposite end is a fan It is possible to further enhance the cooling efficiency by making the side surface of the protruding portion have a step-like shape or a substantially tapered shape by causing the side surface of the protruding portion to protrude toward 51.

  The present invention is not limited to the embodiments described above, and various modifications are possible 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 lighting apparatus 2 Lens case 3 LED holding part 4 Base part 4A Projected part 5 Illumination lens 6 Coupling part 11 Concave part 16 Support pillar 20 Fan apparatus 20a Frame 21 Notch part 29 Groove 30 Window part 50 LED lighting apparatus 51 Fan apparatus 52 enclosure 55 air passage

Claims (9)

A cylindrical lens case having first and second end faces and provided with an illumination lens at 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 connecting portion for sealing the internal space of the lens case by holding the lens case fitted to the recess at the second end face and holding the lens case in a connected state;
A support post formed to project from the base portion to the external space;
A fan device whose frame is supported by the support column;
A screw fixed to the bottom surface of the recess and having a tip protruding through the bottom surface of the recess toward the fan device;
Equipped with
The fan device applies air to be taken in to the end face of the base portion opposite to the concave portion and the screw , and the adjacent support columns are side frames, and the frame and the base portion face each other. An LED lighting apparatus characterized in that each side forming the air flow is discharged from a window portion which is an upper and lower frame. A cylindrical lens case having first and second end faces and provided with an illumination lens at 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 and having a plurality of ventilation paths directed to the lens case on the outer side surface;
A recess formed in the base portion to accommodate the LED holding portion;
A connecting portion for sealing the internal space of the lens case by holding the lens case fitted to the recess at the second end face and holding the lens case in a connected state;
A fan device disposed opposite to the base portion;
A screw fixed to the bottom surface of the recess and having a tip protruding through the bottom surface of the recess toward the fan device;
And a case having openings at both ends and housing the base portion and the fan device inside.
The base portion is disposed in the housing with the air flow passage facing one of the openings, and the fan device is an end surface of the base portion opposite to the recess in the air taken in through the air flow path. And an LED lighting device disposed in the housing so as to form an air flow exhausted from the other of the openings in the housing against the screw .   The surface of the edge part facing the said fan apparatus in the said base part is made into an uneven surface, The LED lighting apparatus of Claim 1 or 2 characterized by the above-mentioned.   The surface of the end portion of the base portion facing the fan device is projected toward the fan device, and the side surface of the projecting portion at that time is configured to be stepped or substantially tapered. The LED lighting device according to claim 1 or 2, characterized in that: The LED lighting device according to claim 1, wherein a plurality of grooves are formed on the side surface of the base portion. The LED lighting device according to claim 5 , wherein the groove is formed in a direction from the fan device toward the lens case.   The LED lighting device according to claim 1 or 2, wherein a heat radiation coating or a heat absorption coating including black alumite treatment is applied to the outer surface of the base and the inner surface of the recess. 8. The LED lighting device according to claim 7 , wherein the heat radiation coating is black alumite treatment using a treatment liquid containing no environmentally harmful substance.   The LED lighting device according to claim 1, wherein a notch is formed in a side surface of the frame substantially communicating with the support column.

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