JP5565775B2 - LED lighting device - Google Patents

Description

  The present invention relates to an LED lighting device, and more particularly, to an LED lighting device that is easy to assemble and maintain and can be focused according to an object to be irradiated.

  Unlike incandescent bulbs and fluorescent lamps, LEDs have a problem in that light emission has directivity and glare occurs due to high-luminance light emitted from the LEDs. Furthermore, there are variations in the amount of light and the light color of LEDs, and there is a problem that non-uniform light is generated when a plurality of LEDs are used. Therefore, when light is directly irradiated without using a reflector or the like, there is a problem that the non-uniformity of the light is conspicuous.

  From such a problem, in order to reduce the glare and reduce the variation in the light amount and the light color to obtain uniform light, the light emitted from the LED is not directly irradiated but is reflected by the reflecting plate and indirectly irradiated. A configuration is required.

  Therefore, in Patent Document 1, in order to obtain a uniform light by reducing the glare and reducing the variation in the light amount and the light color, the light emitted from the LED is not directly irradiated but is reflected by the reflector and indirectly. A configuration for irradiating is disclosed.

Japanese Patent No. 4659155

However, the visual inspection light disclosed in Patent Document 1 is provided with a substrate on which LEDs are mounted along the inner peripheral surface of the annular cover body. That is, it is necessary to bend and attach the substrate in accordance with the curvature of the annular cover body, which makes assembly work difficult.
Further, when one of the plurality of LEDs is damaged, it is necessary to remove the substrate on which the damaged LED is mounted from the cover body, which makes maintenance complicated.

  In addition, the light from the LED can be mixed with the light guide to uniformly irradiate the inspection body, but the light emitted from the light guide only irradiates the lower surface, Only a single focal point can be created, making it difficult to accommodate various inspection objects.

  The present invention has been made in view of such problems, and it is an object of the present invention to provide an LED lighting device that is easy to assemble and maintain and that can make a focal point corresponding to the height of an object to be irradiated. To do.

In order to achieve the above object, an LED lighting device of the present invention is generated from a substrate on which a plurality of LEDs are mounted, and an LED having the same shape as the substrate and provided on one surface of the substrate and mounted on the substrate. In the LED lighting device, comprising: a heat radiating plate that dissipates heat to be emitted; and a light guide that is provided on the other surface of the substrate and emits incident light from the LED from the light output surface. Of the incident light into the light guide, and a light mixing part that reflects and mixes the incident light incident from the incident part in the light guide. The first light-reflecting surface has a smooth shape that reflects incident light from the light-mixing portion, and the light-mixing portion is provided at a position facing the light-emitting surface and reflected by the first light-reflecting surface. The light is emitted from the light exiting surface different from the optical axis of the incident light. A second reflection surface having a substantially circular shape and a second reflection surface that is provided at a position facing the first reflection surface and reflects the light reflected by the first reflection surface in the light guide body together with the second reflection surface. 3 reflective surfaces .

The front Kishirubekotai has a convex of the incident portion and the front Symbol light mixing section is characterized by being formed in an integrated manner.

The front Stories second reflective surface, characterized in that it is formed on the top and / or sides of該混light unit.

  According to the present invention, since the light guide, the substrate, and the heat radiating plate can be stacked and assembled in order, assembly and maintenance are easy. Moreover, since the incident light from the LED is mixed in the light guide, the illuminance from the LED illumination device is uniform, and the object can be irradiated uniformly. Furthermore, since the angle of light output from the light guide can be changed by the inclination angle of the first reflecting surface, a plurality of focal points can be formed. Therefore, the focus suitable for the object can be freely created.

FIG. 2 is a cross-sectional view of a visual inspection light. FIG. 1 is a perspective view showing a configuration of a visual inspection light. FIG. 4 is a perspective view showing the lower surface side of the substrate on which the LED is mounted. FIG. 3 is a perspective view showing the upper surface side of the substrate on which the LED is mounted. FIG. 5 is a perspective view showing the configuration of the heat sink. FIG. 6 is a diagram showing the configuration of the light guide. FIG. 7 is a view showing a cross section of the light guide. Fig.8 (a)-FIG.8 (c) are the figures which showed the behavior of the light within a light guide. FIG. 9 is a view showing a modification of the light guide 400. FIG. 10 is a view showing a modification of the light guide 400.

Next, the invention according to the present embodiment will be described with reference to the drawings.
The LED illumination device in the present embodiment will be described by taking a visual inspection light as an example.
FIG. 1 is a diagram showing a configuration of a visual inspection light.

  As shown in the figure, the LED lighting device 100 used as a visual inspection light is applied to a loupe light so that the inspection body can be irradiated with light and the inspection body can be enlarged and viewed with a magnifying glass. is there. The LED lighting device 100 radiates heat generated from the LED 201, a metallic cover 101 having openings 101a and 101b on the upper surface and the lower surface, a substrate 200 on which the LED 201 housed in the cover 101 is mounted, and the LED 201. The heat-radiating plate 300 and a ring-shaped light guide 400 formed of a translucent material are used.

FIG. 2 is a view of the visual inspection light as viewed from below.
As shown in the figure, this visual inspection light is configured in a ring shape, and a magnifying glass (not shown) is disposed in the opening 101a.

FIG. 3 is a perspective view showing the upper surface side of the substrate on which the LEDs are mounted, and FIG. 4 is a perspective view showing the lower surface side of the substrate on which the LEDs are mounted.
As shown in FIG. 3, the substrate 200 is formed in a flat plate shape and a ring shape, and the LEDs 201 are mounted in the vicinity of the outer periphery on the lower surface side of the substrate 200 so as to follow the outer periphery at equal intervals. Further, as shown in FIG. 4, a metal fitting 202 for fixing the light guide 400 installed on the lower surface side of the substrate 200 as well as fixing the substrate 200 to the cover 101 is provided on the outer peripheral side of the substrate 200. . In addition, a control board 203 that performs lighting control of the LEDs 201 is provided on the outer peripheral side of the board 200.

  The LED 201 is composed of a red LED, a green LED, and a blue LED. Note that a three-color LED in which a red LED, a green LED, and a blue LED are integrated in one package may be used.

FIG. 5 is a perspective view showing the configuration of the heat sink.
As shown in the figure, the heat dissipation plate 300 has a flat plate shape and a ring shape, and is configured to be substantially the same as the outer diameter and inner diameter of the substrate 200. The heat radiating plate 300 is installed on the upper surface side of the substrate 200 and radiates heat generated by driving the LED 201. In addition, the heat sink 300 is formed with a metal (for example, aluminum etc.) with high heat conductivity.

FIG. 6 is a diagram illustrating a configuration of the light guide, and FIG. 7 is a diagram illustrating a cross section of the light guide.
As shown in FIG. 6, the light guide 400 has a ring shape and is made of a material having heat resistance, insulation, and light transmission, and is made of, for example, an acrylic resin or a polycarbonate resin. In addition, a reflection film for reflecting light emitted by the LED 201 is formed on a part of the light guide 400.
Note that the light guide 400 is not limited to a ring shape, and can be formed of an acrylic resin or the like into an arbitrary shape depending on the usage.

As shown in FIG. 7, the light guide 400 in its cross-section, part of which is formed into a substantially circular shape protruding in a convex shape. The convex portion is an incident portion 401 for allowing light from the LED 201 to enter, and the substantially circular cross-sectional portion is a light mixing portion 402 for mixing incident light.

The incident portion 401 is positioned directly below the LED 201 when the light guide 400 is installed on the lower surface of the substrate 200. The incident portion 401 has a reflection surface 401 a that reflects light generated by the LED 201 into the light mixing portion 402. The reflective surface 401 a is coated with a white paint to form a reflective film, and is inclined toward the inner diameter of the light guide 400. And the focal distance to a test body can be changed by changing the inclination angle R of this reflective surface in the range of 30-50 degrees.
In addition, this reflective surface 401a may be arc-shaped, and its shape may be changed depending on the object to be irradiated.

Light mixing unit 402, a substantially circular shape of the upper surface and the straight side surface white paint is applied to of the reflective film is formed reflecting surface 402a, 402b and the light mixed light in the light mixing part 402 having a light emitting surface 402c of the cross section circular to Idemitsu. The light reflected on the reflecting surface 401a of the incident portion 401 is repeatedly reflected and mixed on the reflecting surfaces 402a and 402b of the light mixing portion 402, and emitted from the light emitting surface 402c, so that the lower surface of the LED lighting device 100 is evenly irradiated. can do. In addition, the light exit surface 402c is configured to emit light toward the central axis of the light guide 400, and according to the distance between the LED illumination device 100 and the inspection body by changing the curvature of the light exit surface 402c. You can make a focus.

  In the LED lighting device 100 of the present embodiment, the cover 101, the substrate 200, the heat radiating plate 300, and the light guide 400 are separate from each other, so that each component can be easily replaced. For example, even when one of the LEDs 201 is damaged, the substrate 200 can be easily separated from the LED lighting device 100, so that the replacement of the LEDs 201 is facilitated.

Next, the behavior of light in the light guide 400 will be described in detail with reference to FIG.
Fig.8 (a)-FIG.8 (c) are the figures which showed the behavior of the light within a light guide.
As shown in the drawing, the light emitted from the LED 201 enters the incident portion 401 and is reflected by the reflecting surface 401a (FIG. 8A). The light reflected by the reflection surface 401a enters the light mixing unit 402 and is reflected by the reflection surface 402a on the upper surface of the light mixing unit 402 or the reflection surface 402c on the side surface (FIG. 8B). In the light mixing unit 402, light is repeatedly reflected on the reflection surfaces 402a and 402b, and light is repeatedly reciprocated in the light guide 400 by so-called pumping to be mixed. Then, the mixed light exits from the light exit surface 402c and is irradiated on the lower surface of the LED illumination device 100 (FIG. 8C). At this time, since the light exit surface 402c is configured to condense on the central axis of the light guide 400, the light output can be focused on the central axis to form a focal point.
Further, the light emitted from the LED 201 is mixed in the light guide 400, so that the inspection object can be uniformly irradiated, and unevenness in illuminance can be eliminated.

Next, a modified example of the light guide 400 is shown.
FIG. 9 is a view showing a modification of the light guide 400.
As shown in the drawing, the light incident port 401 b of the incident portion 401 has a concave shape that is slightly larger than the size of the LED 201. By covering the LED 201 with the concave incident port 401b, light emission of the LED 201 can be incident on the incident portion 401 without omission, and light emission loss can be reduced.

FIG. 10 is a view showing a modification of the light guide 400.
The illustrated light guide 400 corresponds to the LEDs 201 mounted on the outer peripheral side and the inner peripheral side of the substrate 200 in order to increase the illuminance of the LED lighting device 100.
In such a case, the light guide 400 is configured to include the incident portions 401 on the outer diameter side and the inner diameter side. The light emitted from each LED 201 enters the respective incident portions 401, is reflected by the reflection surface 401 a, and enters the light mixing portion 402. In the light mixing unit 402, the light is reflected by the reflection surface 402a on the upper surface, and the above-described pumping is repeated to emit light from the light emission unit 402c on the lower surface.

  The LED lighting device 100 described above is formed in a ring shape and a magnifying glass (not shown) is disposed in the opening 101a. However, the shape of the light guide 400 is not limited to the ring shape, and a rectangular shape or fluorescent light is used. It may be formed in a straight tube type such as a lamp, and can be designed freely according to the use mode.

DESCRIPTION OF SYMBOLS 100 LED illuminating device 101 Cover 101a, 101b Opening part 200 Substrate 201 LED
202 Metal fitting 300 Heat sink 400 Light guide 401 Incident part 401a, 402a, 402b Reflecting surface 402 Light mixing part 402c Light exiting surface

Claims (3)

A board on which a plurality of LEDs are mounted, a heat sink that has the same shape as the board and is provided on one surface of the board and dissipates heat generated from the LEDs mounted on the board, and is provided on the other surface of the board A light guide that emits incident light from the LED from the light exit surface, and an LED lighting device comprising:
The light guide includes an incident part that makes incident light from the LED enter the light guide, and a light mixing part that reflects and mixes the incident light incident from the incident part in the light guide. Become
The incident part has a smooth first reflecting surface that reflects incident light from the LED to the light mixing part,
The light mixing section is provided at a position facing the light exit surface, and has a substantially circular cross section in which the light reflected by the first reflection surface is made different from the optical axis of the incident light and is emitted from the light exit surface. A second reflecting surface and a third reflecting surface that is provided at a position facing the first reflecting surface and reflects the light reflected by the first reflecting surface together with the second reflecting surface within the light guide. An LED lighting device comprising: The light guide body, LED lighting device according to claim 1 in which the convex of the incident portion and the front Symbol light mixing section is characterized by being formed in an integrated manner. The LED lighting device according to claim 1 , wherein the second reflection surface is formed on an upper surface and / or a side surface of the light mixing portion .

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