JP2006236894A - Led unit and illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED unit in which heat radiation characteristics of an LED element can be improved, and provide an illumination device provided with this LED unit. <P>SOLUTION: This device is provided with a unit main body 2 having a reflecting face 13, a front plate 3 mounted on the unit main body 2 so as to cover the reflecting face 13, and having a light irradiation window 5 for radiating the light reflected on the reflecting face 13 toward the outside, and the LED element 7 installed on the face opposed to the reflecting face 13 of the front plate 3, and irradiating the light to the reflecting face 13. The unit main body 2 and the front plate 3 are formed, respectively, from high heat conductive materials. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an LED unit having an LED element and an illumination device.

Conventionally, lighting devices using LED elements as light sources are known (see, for example, Patent Document 1). In such an illumination device, since the LED element is smaller than incandescent lamps and fluorescent lamps, there is an effect that the device can be miniaturized.
JP 2000-251503 A

However, when the LED element has high output and high brightness, the amount of heat generated by the light emitting element increases and the life characteristics deteriorate, so it is difficult to increase the brightness of the lighting device.
This invention is made | formed in view of the situation mentioned above, and aims at providing the LED unit which can improve the thermal radiation characteristic of an LED element, and an illuminating device provided with this LED unit.

  In order to achieve the above object, the present invention provides a unit body having a reflecting surface, and is attached to the unit body so as to cover the reflecting surface, and radiates light reflected by the reflecting surface to the outside. A front plate having a light irradiation window and an LED element that is provided on a surface facing the reflection surface of the front plate and irradiates light on the reflection surface, and the unit body and the front plate are respectively Provided is an LED unit which is formed of a high thermal conductivity material.

Moreover, the present invention is characterized in that, in the above-mentioned invention, the reflecting surface is formed by metal vapor deposition.
Further, the present invention is the above invention, wherein the reflecting surface has a curved surface such that the maximum optical axis vertical angle is about 0 degree and the ½ illuminance angle is about 15 degrees to about 20 degrees. And
According to the present invention, in the above invention, the reflecting surface has a curved surface such that the maximum optical axis vertical angle is about 10 degrees to 30 degrees and the ½ illuminance angle is about 50 degrees to about 70 degrees. It is characterized by that.
Further, the present invention is characterized in that, in the above-mentioned invention, the shape of the reflecting surface has a curved surface with a maximum optical axis vertical angle of about 20 degrees to about 70 degrees.
Moreover, this invention provides the illuminating device provided with one or more of said LED units.

  According to the present invention, since the unit main body and the front plate are each formed of a high thermal conductivity material, the heat dissipation characteristics of the LED element can be improved.

Embodiments of the present invention will be described below with reference to the drawings.
<LED unit>
FIG. 1 is a perspective view schematically showing a configuration of an LED unit 1 according to the present embodiment. As shown in this figure, the LED unit 1 includes a unit main body 2 and a front plate 3 attached to the front surface of the unit main body 2. The unit main body 2 is formed in a substantially rectangular parallelepiped shape having both vertical and horizontal lengths W of about 3 to 4 cm and a thickness H of about 2 to 3 cm, and the front plate 3 covers substantially the entire front surface of the unit main body 2. It is a plate material, is formed in a substantially rectangular shape, and is attached to the front surface of the unit body 2 with screws 4. The front plate 3 is formed with a pair of upper and lower irradiation windows 5 opening in a substantially rectangular shape, and light is irradiated from the respective irradiation windows 5 toward the front side as indicated by an arrow A in the figure.

  FIG. 2 is a perspective view showing the back surface of the front plate 3. As shown in this figure, a screw hole 10 through which the screw 4 is passed is formed at the edge of the front plate 3, and a substantially rectangular high thermal conductivity wiring is formed on the back surface of the front plate 3. A substrate 6 is provided, and an LED element 7 is mounted on the wiring substrate 6. At this time, the LED element 7 is mounted with the emission surface 7A facing upward, and the emission surface 7A of the LED element 7 faces the unit body 2 when the front plate 3 is attached to the unit body 2. In addition, two lead wires 8A and 8B are connected to one end portion of the wiring board 6, and power is supplied to the LED element 7 from an LED driving circuit (not shown) via these lead wires 8A and 8B. Further, as shown in FIG. 1, a wiring lead-out groove 9 is formed on one side surface of the unit main body 2, and when the front plate 3 is attached to the unit main body 2, the lead wires 8A and 8B are wired. It is pulled out from the lead-out groove 9 and connected to an LED drive circuit (not shown).

  3 is a front view of the unit main body 2, and FIG. 4 is a cross-sectional view taken along line B-B 'of FIG. As shown in FIG. 3, the unit main body 2 has a square recess 11 in the front center, and a screw hole 12 that engages with the screw 4 and the wiring lead-out groove 9 are formed around the recess 11. Has been. Further, a screw hole 14 for fixing the LED unit 1 to a mounting base (not shown) by screws is formed on the back surface of the unit main body 2. Further, as shown in FIG. 4, a reflective surface 13 that is curved in a parabolic shape is formed on the surface of the recess 11. The reflection surface 13 is formed by depositing a material (for example, aluminum metal) having a high reflectance with respect to the wavelength of light emitted from the LED element 7 on the surface of the recess 11.

  When the front plate 3 is attached to the unit main body 2, the LED element 7 is disposed opposite to the central portion O of the reflecting surface 13 as shown by phantom lines in FIGS. Light is emitted toward Then, the light is reflected toward the front side by the reflecting surface 13, and light is irradiated from the irradiation window 5 as shown in FIG. Thus, since this LED unit 1 is the structure which reflects the light emission of the LED element 7 by the reflective surface 13, and takes out indirectly, it becomes possible to reduce glare (glare).

  Here, this LED unit 1 is configured to have a narrow-angle light distribution so that spot light can be formed by making the shape of the reflection surface 13 as follows. That is, the shape of the reflecting surface 13 is a paraboloid shape in which the maximum optical axis vertical angle is 0 degree and the ½ illuminance angle is 15 degrees to 20 degrees. Moreover, this LED unit 1 is designed so that the maximum axial luminous intensity is about 140 cd (candela) or more. FIG. 5 shows a light distribution pattern obtained when such an LED unit 1 is mounted at a height of 2M (meters). As shown in this figure, a substantially circular light distribution pattern is obtained immediately below the LED unit 1, and when the mounting height of the LED unit 1 is different from 2M, the light distribution pattern shown in FIG. Is enlarged or reduced according to the distance from the LED unit 1 to the irradiation surface, and the average illuminance within the irradiation range is increased or decreased according to the expansion or reduction of the irradiation range.

  The unit body 2 is more specifically described. The unit body 2 is molded from a material having high thermal conductivity (for example, a metal such as copper or aluminum, a high thermal conductivity ceramic, or the like) with the concave portion 11, and the concave portion 11 is molded. After the surface is polished, a metal is vapor-deposited on the upper surface to form the reflecting surface 13. The front plate 3 is formed of a material having high thermal conductivity, like the unit body 2.

By setting it as such a structure, it becomes possible to heat-emit heat of the LED element 7 toward the unit main body 2 from the front board 3, and to perform the exhaust heat of the said LED element 7 efficiently. As a result, it is possible to use a high output LED element 7, improve the life characteristics of the LED element 7, and extend the life.
Moreover, according to this LED unit 1, since the reflective surface 13 was formed by metal vapor deposition as mentioned above, a high reflectance is achieved and light distribution control can be performed with high accuracy. In addition, it can replace with metal vapor deposition and the said reflective surface 13 can also be formed by an alumite process.

  Here, in the present embodiment, since the concave portion 11 of the unit body 2 is formed at the time of molding, the unit body 2 is formed by using a mold in which the shape of the concave portion 11 is appropriately changed. Besides the light, for example, the LED unit 1 having other light distribution such as wide-angle light distribution and asymmetric light distribution can be easily manufactured. Hereinafter, the LED unit 1A having a wide-angle light distribution and the LED 1B having an asymmetric light distribution will be described in order.

6 is a front view of the unit main body 2A of the LED unit 1A having a wide-angle light distribution, and FIG. 7 is a cross-sectional view taken along the line CC ′ of FIG. In these drawings, the same members as those shown in FIGS. 3 and 4 are denoted by the same reference numerals, and the description thereof is omitted.
As shown in FIGS. 6 and 7, the reflecting surface 13 </ b> A formed in the recess 11 of the unit body 2 </ b> A is formed in a curved shape so that the paraboloid is raised at the central portion O, and the vicinity of the raised portion 17. Is reflected at a relatively large reflection angle in the vertical direction of the unit body 2, and as a result, a wide-angle light distribution pattern is exhibited. In addition, the LED unit 1A is designed so that its maximum axial luminous intensity is about 60 cd (candela) or more. FIG. 8 shows a light distribution pattern obtained when such an LED unit 1A is mounted at a height of 2M (meters). As shown in this figure, a light distribution pattern extending in the height direction (vertical direction) of the unit body 2A is obtained immediately below the LED unit 1A. In order to obtain such a light distribution pattern, the shape of the reflecting surface 13A is such that the maximum optical axis vertical angle is about 10 degrees to 30 degrees and the ½ illuminance angle is about 50 degrees to about 70 degrees. Any shape having such a curved surface may be used.

FIG. 9 is an external perspective view of the LED unit 1 </ b> B having an asymmetric light distribution, and FIG. 10 is a perspective view showing the back surface of the front plate 3. 11 is a front view of the unit main body 2B, and FIG. 12 is a cross-sectional view taken along the line DD ′ of FIG. In these drawings, the same members as those shown in FIGS. 1 to 4 are designated by the same reference numerals, and the description thereof is omitted.
As shown in FIG. 9, in this LED unit 1B, only one irradiation window 5 is formed on the upper side of the front plate 3B, and on the back surface of the front plate 3B, as shown in FIG. In addition, the wiring board 6 on which the LED elements 7 are mounted is disposed on the lower end side of the front plate 3B. Accordingly, the unit main body 2B is formed with a wiring lead-out groove 9 for drawing out the lead wires 8A and 8B on the lower end side of the side surface.

  As shown in FIGS. 11 and 12, in the unit main body 2B, the reflecting surface 13B formed in the recess 11 is formed in a curved shape such that the paraboloid has a large curvature below the center portion O. At the same time, the LED element 7 is disposed opposite to the lower surface of the central portion O with respect to the reflecting surface 13B. Therefore, the light emitted from the LED element 7 to the reflecting surface 13B is reflected toward the irradiation window 5 (see FIG. 9) provided on the upper side of the LED unit 1B by the curvature increasing portion 15 in which the curvature greatly increases. As a result, an asymmetric irradiation pattern is obtained. Further, the LED unit 1B is designed such that the maximum axial luminous intensity is about 120 cd (candela) or more. FIG. 13 shows a light distribution pattern obtained when the LED unit 1B is attached to a position having a height of 2M (meters). As shown in this figure, a substantially elliptical light distribution pattern having a substantially center at a point P that is a predetermined distance away from directly below the LED unit 1B is obtained immediately below the LED unit 1B. In order to obtain such a light distribution pattern, the shape of the reflecting surface 13B may be a shape having a curved surface with a maximum optical axis vertical angle of about 20 degrees to about 70 degrees.

<Lighting device>
It is possible to configure a lighting device by combining a plurality of LED units 1, 1 </ b> A, and 1 </ b> B of the present embodiment. In the following, an approach light that illuminates the foot will be described as an example of such an illumination device.
As shown in FIG. 14, the approach light 50 includes a pole 51 having a height of about 1M that is erected on the ground, and an illumination head 52 that is attached to the tip 51A of the pole 51 and extends substantially parallel to the ground. The light is emitted from the head 52 toward the ground. As shown in FIG. 15, the head 52 includes a box-shaped head case body 53 having a front opening, and a cover member (not shown) formed of, for example, glass or plastic that covers the front opening of the head case body 53. The internal space of the head case body 53 is partitioned by a plurality of partitions 54, and a mounting portion 55 to which the LED units 1, 1A, 1B are detachably mounted is formed. In the following description, the center line in the longitudinal direction of the head case body 53 (head 52) is expressed as a center line Y, and its midpoint is expressed as X. Although not shown, each mounting portion 55 is provided with a connector to which the lead wires 8A, 8B drawn from the LED units 1, 1A, 1B are connected.

Now, with the configuration as described above, the LED unit 1, 1A, 1B is mounted on the head case body 53 in an appropriate combination so that the light distribution of the approach light 50 can be made according to the usage environment, user preference, and the like. Various changes can be made.
For example, when only one LED unit 1A having a wide-angle light distribution is attached to the head case body 53, the light distribution extending in a direction substantially perpendicular to the longitudinal direction of the head 52, as shown in FIG. A pattern can be formed. Therefore, when a plurality of approach lights 50 are erected along the sidewalk, the section in which one approach light 50 can be irradiated becomes longer by matching the direction in which the light distribution pattern extends with the direction along the sidewalk. Therefore, the sidewalk can be efficiently illuminated with a small number of approach lights 50.

Further, for example, when only one LED unit 1B having an asymmetrical light distribution is attached to the head case body 53, as shown in FIG. Since a light distribution pattern that illuminates a distant position is obtained, it is possible to effectively illuminate a place far from the approach light 50.
Further, when only one LED unit 1 having a narrow-angle light distribution is mounted on the head case body 53, only a narrow range immediately below the head 52 is effectively illuminated as shown in FIG. be able to.

Furthermore, exemplifying a case where a plurality of LED units 1, 1A, 1B are mounted on the head case body 53, for example, when two or more LED units 1A having wide-angle light distribution are mounted on the head case body 53, As shown in FIG. 17A, it is possible to form a light distribution pattern that extends in a direction substantially perpendicular to the longitudinal direction of the head 52 and also extends in the longitudinal direction of the head 52, and can irradiate a wide range as a whole. It becomes.
Further, for example, when only one LED unit 1A having a wide-angle light distribution and one LED unit 1B having an asymmetric light distribution are mounted on the head case body 53, as shown in FIG. A light distribution pattern is obtained by combining a light distribution pattern extending in a direction substantially perpendicular to the longitudinal direction of the head and a light distribution pattern that irradiates a position distant from the midpoint X of the head 52 in the longitudinal direction of the head 52. It is possible to simultaneously illuminate the direction along the center and the direction from the center of the sidewalk.

  When only one LED unit 1 having a narrow angle light distribution and one LED unit 1B having an asymmetric light distribution are mounted on the head case body 53, as shown in FIG. A light distribution pattern in which a light distribution pattern for irradiating a narrow area immediately below 52 and a light distribution pattern for irradiating a position distant from the midpoint X of the head 52 in the longitudinal direction of the head 52 is obtained. It is possible to efficiently illuminate a range from directly under 50 to the center of the sidewalk.

In addition to the approach light 50, the lighting device can be configured as a pole light that illuminates the road from a high position using the LED units 1, 1A, and 1B.
Specifically, as shown in FIG. 18, the pole light 60 is attached to a pole 61 having a height of about 3.5 M that is erected on the ground and a tip 61 </ b> A of the pole 61 so as to be parallel to the ground. A supporting column 62 that extends, and a main light source 63 that is attached to the tip of the supporting column 62 and illuminates the ground (road), and further, a first auxiliary lamp 64 that is attached to the supporting column 62 and illuminates the ground directly below. The second auxiliary lamp 65 is provided in the middle of the pole 61 (for example, at a height of 2M) and illuminates the ground (road) from an oblique direction.

The first and second sub-lights 64 and 65 are supplied with electric power from a built-in power source (not shown) when a power failure occurs and the main light source 63 is turned off. Irradiation. One or a plurality of LED units 1 having a narrow-angle light distribution are provided in the first sub-light 64, and a light distribution pattern for illuminating a substantially circular shape immediately below the pole light 60 is formed as shown in FIG. Further, the second sub-light 65 is provided with one or a plurality of LED units 1B having asymmetric light distribution, and a light distribution that illuminates a portion (such as a road side) away from the pole light 60 in a substantially elliptical shape as shown in FIG. A pattern is formed.
As a result, even when the main light source 63 is turned off due to a power failure or the like, the first and second sub-lights 64 and 65 illuminate the area directly below the pole light 60 and the road side, thereby ensuring road safety. Further, since the LED unit 1 generally consumes less power than the main light source 63, the first and second auxiliary lights 64 and 65 are turned on instead of turning on the main light source 63, thereby saving the pole light 60. Electricity is achieved. Therefore, for example, at midnight, the main light source 63 is turned off, and instead, the first and second auxiliary lights 64 and 65 are turned on, so that the power consumption of the pole light 60 can be reduced. . In addition, the plurality of LED units 1 and 1B provided in the first and second sub-lights 64 and 65 are selectively turned on in a number capable of maintaining a predetermined illuminance, and the other LED units 1 and 1B are turned off. Thus, further power saving can be achieved.

Further, the LED units 1, 1A, 1B can be applied to a light source of an upper light (light projector) that is attached to a tree planted in a park or the like and lights up the tree.
FIG. 21 is a side view showing the configuration of the upper light 100. As shown in this figure, the upper light 100 has a disk-shaped light body 110 having a diameter of about 27 cm and a thickness of about 7 cm, and a hinge 111 that can be bent and attached to the back surface of the light body 110. Arm 112. The back surface of the light body 110 is provided with a plurality of opening slits so that the inside of the light body 110 can be air-cooled.

FIG. 22 is a front view of the light main body 110. As shown in this figure, a plurality of LED units 1 having a narrow-angle light distribution (21 in the illustrated example) are laid in the light main body 110, and the light source of the upper light 100 is constituted by these LED units 1. Then, light is emitted from these LED units 1.
As described above, these LED units 1 are excellent in heat dissipation characteristics, and further, the light body 110 is also cooled by air cooling, so that the upper light 100 is prevented from being overheated to a high temperature, in the tree or in the vicinity thereof. The safety when attached is improved.
In addition, you may comprise a light source using LED unit 1A which has wide-angle light distribution, or LED unit 1B which has asymmetrical light distribution, or combining these LED units 1, 1A, 1B suitably.

As described above, according to the present lighting device, the LED units 1, 1A, and 1B that have excellent heat dissipation characteristics, high output, high brightness, and long life are used as the light source. Even if it is used, the brightness of the lighting device can be increased.
In addition, by appropriately combining LED units 1, 1A, and 1B having various light distribution patterns to configure a light source, it becomes possible to easily configure a light source having a light distribution pattern that matches the purpose of use and use location. .
Moreover, according to this illuminating device, the light quantity of a light source can be adjusted and selected easily by adding each LED unit 1, 1A, 1B suitably.

It should be noted that the above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified within the scope of the present invention.
For example, although the approach light and the pole light have been exemplified as the lighting device, the present invention is not limited to this, and the lighting device is provided on the rail of the railing provided on the guardrail or the like, or on the foot of the bench installed in the park or the like. The LED units 1, 1 </ b> A, and 1 </ b> B can be used as a light source of each lighting device that is provided at an appropriate interval on a lighting device or a handrail to illuminate a sidewalk.

It is a perspective view which shows the structure of the LED unit which concerns on embodiment of this invention. It is a perspective view which shows the structure of the back surface of a front board. It is a front view which shows the structure of a unit main body. It is sectional drawing which shows the structure of a unit main body. It is a figure which shows a narrow angle light distribution pattern. It is a front view which shows the structure of the unit main body of the LED unit which has a wide angle light distribution pattern. It is sectional drawing which shows the structure of the unit main body. It is a figure which shows a wide angle light distribution pattern. It is a perspective view which shows the structure of the LED unit which has asymmetrical light distribution. It is a perspective view which shows the structure of the back surface of the front plate of the LED unit. It is a front view which shows the structure of the unit main body of the LED unit. It is sectional drawing which shows the structure of the unit main body. It is a figure which shows an asymmetrical light distribution pattern. It is a figure which shows the structure of an approach light. It is a top view which shows the structure of the head of an approach light. It is a figure which shows the light distribution pattern of an approach light. It is a figure which shows the light distribution pattern of an approach light. It is a figure which shows the structure of a pole light. It is a figure which shows the light distribution pattern of a pole light. It is a figure which shows the light distribution pattern of a pole light. It is a side view which shows the structure of an upper light. It is a front view of the light main body of an upper light.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B LED unit 2, 2A, 2B unit main body 3 Front plate 5 Irradiation window 7 LED element 13, 13A, 13B Reflecting surface 50 Approach light (illumination device)
60 Pole light (lighting device)
100 Upper light (lighting device)

Claims (6)

A unit body having a reflective surface;
A front plate that is attached to the unit main body so as to cover the reflection surface, and has a light irradiation window for radiating light reflected by the reflection surface to the outside;
An LED element provided on a surface of the front plate facing the reflective surface and irradiating the reflective surface with light;
The unit main body and the front plate are each formed from a highly heat conductive material.   The LED unit according to claim 1, wherein the reflective surface is formed by metal vapor deposition. The reflective surface is
3. The LED unit according to claim 1, wherein the LED unit has a curved surface such that a maximum optical axis vertical angle is about 0 degree and a ½ illuminance angle is about 15 degrees to about 20 degrees. The reflective surface is
3. The LED according to claim 1, wherein the LED has a curved surface with a maximum optical axis vertical angle of about 10 degrees to 30 degrees and a ½ degree illuminance angle of about 50 degrees to about 70 degrees. unit. The shape of the reflecting surface is
The LED unit according to claim 1, wherein the LED unit has a curved surface with a maximum optical axis vertical angle of about 20 degrees to about 70 degrees. An illumination device comprising one or a plurality of the LED units according to claim 1.

Images