JP5331513B2 - LED lighting equipment - Google Patents

Description

  The present invention relates to an LED lighting apparatus that employs an LED as a light source, and more particularly, to an LED lighting apparatus including a white LED that obtains white light by emitting a yellow phosphor with a blue LED or an ultraviolet LED.

  Conventionally, various LED lighting fixtures using LEDs as light sources are known (see, for example, Patent Document 1). In this type of LED lighting apparatus, the irradiation intensity is generally increased by increasing the output of the LED.

JP 2007-234558 A

However, when the output of the LED is increased, the heat generation of the LED also increases. Therefore, in order to avoid shortening the life of the LED or the like, it is necessary to improve the heat dissipation of the instrument body. For this reason, in order to raise the heat dissipation of an instrument main body, it was a result which caused the enlargement of an instrument main body by adding a radiation fin or incorporating a heat sink.
This invention is made | formed in view of the situation mentioned above, and it aims at providing the LED lighting fixture which can raise an irradiation intensity | strength, without making high output of LED.

In order to achieve the above object, according to the present invention, in an LED lighting apparatus including an LED as a light source, the LED is configured by arranging a plurality of LED elements in a planar shape and emits substantially rectangular planar light. The lighting fixture body has a reflector having a concave reflecting surface with an opening at the bottom, and the LED is disposed at the opening at the bottom, and the concave reflecting surface is adapted to the substantially rectangular surface light of the LED. The LED is composed of planar inclined surfaces arranged on the front, back, left, and right of the LED, and the entire planar inclined surface of the concave reflective surface is vapor-deposited so that the reflectance of the concave reflective surface is 90% or more, and each of the concave reflective surfaces The irradiation range of the primary reflected light on the flat inclined surface and the irradiation range of the direct light passing through the concave reflection surface are substantially the same.
According to the present invention, in the LED lighting apparatus, the plurality of LEDs are arranged vertically and horizontally at a predetermined interval, the concave reflecting surface is provided on the reflector corresponding to each LED, and a substantially rectangular region is formed. It is characterized by floodlighting.
Further, the present invention is characterized in that in the LED lighting apparatus, an increased reflection film or silver is provided on the entire surface of the reflector including the concave reflection surface.

  According to the present invention, the LED is disposed at the bottom of the concave reflecting surface, so that light from the concave reflecting surface is irradiated as irradiation light. At this time, since the irradiation range of the primary reflected light having the highest intensity among the reflected light from the concave reflecting surface and the irradiation range of the direct light from the concave reflecting surface are substantially the same, the intensity of the irradiation light in the entire irradiation range Can be improved uniformly and efficiently.

It is a figure which shows all the front, a plane, a right side, and a back surface of the LED projector which concerns on embodiment of this invention. It is an assembly drawing of a light source case and a light source unit. It is a figure which shows the structure of a LED package. It is a figure which shows the range of the primary reflection in the concave reflective surface of the said reflector, and the range of direct light while expanding and showing a LED package and a reflector.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, an LED projector is illustrated as an example of an LED lighting fixture, but the present invention is not limited to this, and any LED lighting fixture having a support leg can be applied.

  FIG. 1 is a diagram illustrating both a front surface, a plane surface, a right side surface, and a back surface of an LED projector 1 according to the present embodiment. The LED projector 1 includes a luminaire main body 7 formed by integrally connecting a light source case 3 and a power supply case 5, and a support leg 9 for attaching a structure that supports the luminaire main body 7 at a variable angle. Each of the light source case 3, the power supply case 5, and the support legs 9 is integrally formed from a material having high thermal conductivity such as aluminum die casting.

The light source case 3 is a case for housing a light source unit 33 having a plurality of LED packages 35. The light source case 3 has a substantially box shape with a thickness smaller than the length and width, and a substantially rectangular irradiation opening 13 on the front. An opening and a transparent cover 15 made of glass or resin are fitted, and light is irradiated from the irradiation opening 13 toward the front. The back surface of the light source case 3 swells in a substantially arc shape, and a large number of heat radiation fins 11 extending vertically are integrally formed on this back surface.
At the lower end of the light source case 3, a support leg mounting portion 4 formed integrally with a width B smaller than the width A of the main part of the light source case 3 is integrally formed.

  The power supply case 5 is a horizontally long box-shaped case containing a power supply circuit for supplying power to the LED package 35. The lateral width is slightly smaller than the support leg mounting portion 4 of the light source case 3, and a gap is provided between the support leg 9. Similarly to the light source case 3, a plurality of heat radiation fins 19 extending vertically are also provided integrally on the back surface of the power supply case 5. The power supply case 5 is integrally coupled to the lower end of the support leg mounting portion 4 of the light source case 3, and thereby a luminaire main body 7 is configured.

  The support leg 9 is a member that is formed in a generally U-shape for supporting the luminaire main body 7 on a structure such as a wall surface or a column of a building with a variable angle, and has an open end at the light source case 3. A support member (support shaft) 21 is rotatably supported on the left and right side surfaces of the support leg mounting portion 4. The shaft support member 21 is formed of a material having high thermal conductivity, such as aluminum die casting, like the light source case 3 and the like, and thermally couples the light source case 3 and the support legs 9 well.

Further, the lateral width of the support leg 9 is approximately the same as the lateral width A of the light source case 3, and the design is devised so that the support leg 9 does not protrude laterally with respect to the luminaire main body 7.
At this time, the leg portion 9A of the support leg 9 has a thickness C defined by the difference between the width A and the width B, and by increasing the thickness of the leg portion 9A compared to a conventional LED projector, The heat capacity of the leg 9A is increased. The thickness C of the leg portion 9A is set to such a thickness that the heat generated by the LED package 35 that cannot be radiated by the light source case 3 alone can be conducted and heat can be radiated satisfactorily. Thereby, even if it does not enlarge the lighting fixture main body 7, the heat dissipation of the heat | fever which the LED package 35 emits is improved.

  Further, as described above, since the power supply case 5 is not in contact with the support leg 9, heat is not transferred from the support leg 9 to the power supply case 5, so that extra heat is applied to the power supply circuit of the power supply case 5. Therefore, the power supply circuit housed in the power supply case 5 is prevented from being damaged by heat.

FIG. 2 is an assembly view of the light source case 3 and the light source unit 33.
The light source unit 33 is configured by connecting a plurality of LED packages 35 in series by wirings 34 and bonding them at a predetermined interval on one rectangular ceramic plate 37 made of alumina having high thermal conductivity, for example. The ceramic plate 37 is provided in close contact with the bottom surface 3 </ b> A of the light source case 3. Thus, by arranging each LED package 35 on one ceramic plate 37, uniform cooling can be achieved while achieving insulation.
The light source case 3 is attached with a reflector 41 having a concave reflecting surface 43 corresponding to each LED package 35 so as to press the light source unit 33 from above, and the adhesion between the light source unit 33 and the light source case 3. Has been increased.

Here, since the light source unit 33 is configured by adhering a plurality of LED packages 35 to a single ceramic plate 37 as described above, the adhesion of the ceramic plates 37 varies among the LED packages 35. It is likely to occur. If the variation occurs in this way, the heat dissipation is different, so that the life of the LED package 35 is also different. Therefore, the reflector 41 presses each LED package 35 so that the adhesiveness does not vary.
More specifically, as shown in FIG. 3, the LED package 35 has a plan view in which 24 × 3 LEDs 65 are arranged in a grid pattern on an LED substrate 61 in which an insulating layer 61B is provided on the surface of a metal plate 61A. The light emitting unit 63 is formed in a rectangular shape, and planar light having a substantially rectangular irradiation shape is emitted from the light emitting unit 63. Note that a plurality of LEDs 65 may be arranged at a predetermined interval in a substantially circular shape in plan view so as to have a substantially circular irradiation shape. In the figure, reference numeral 66 denotes an anode electrode formed on the LED substrate 61, and reference numeral 67 denotes a cathode electrode. The LED package 35 has a high output that outputs a luminous flux of about 1100 lm or more, and the light source unit 33 is composed of six LED packages 35.

  On the light source unit 33, the reflector 41 is provided so as to press the light source unit 33 against the bottom surface 3 </ b> A of the light source case 3. The reflector 41 is formed with a concave reflecting surface 43 corresponding to the light emitting portion 63 of each LED package 35 of the light source unit 33. The bottom 43A of the concave reflecting surface 43 has a bottom 43A as shown in FIG. In addition, a cushioning material 71 having flexibility and insulation is disposed. The bottom 43A of each concave reflecting surface 43 presses the LED substrate 61 against the ceramic plate 37 via the buffer material 71, so that each of the LED packages 35 comes into close contact with the ceramic plate 37, and the variation in adhesion is eliminated. It is.

By the way, in this LED projector 1, the higher irradiation intensity is obtained as follows without further increasing the output of the LED package 35.
More specifically, as shown in FIG. 4, the primary reflection light irradiation range β1 and the primary reflection light irradiation range β2 on the left side of the concave reflection surface 43 overlap with the primary reflection light irradiation. It is defined as a range β (= β1 + β2), and this irradiation range β is substantially the same as the direct light irradiation range α passing through the concave reflecting surface 43, that is, the cut-off angles of the direct light and the primary reflected light are the same. A concave reflecting surface 43 is formed.
Thereby, the irradiation range β of the primary reflected light having the highest intensity among the reflected light of the concave reflecting surface 43 and the irradiation range α of the direct light from the concave reflecting surface 43 are respectively directed to substantially the same range. Irradiation light intensity is increased. Moreover, since direct light and primary reflected light irradiate the same range, the occurrence of illuminance unevenness and color unevenness is prevented.

  As described above, irradiation light having a substantially rectangular irradiation shape is radiated from the light emitting portion 63 of the LED package 35. Therefore, planar inclined surfaces are arranged on the front, rear, left, and right sides of the light emitting portion 63 according to the irradiation shape. Thus, the concave reflecting surface 43 that makes the irradiation ranges of the primary reflected light and the direct light the same can be easily configured.

The concave reflection surface 43 has a reflectivity of 90% or more by depositing a reflective film or silver on the entire surface of the reflector 41 including the concave reflection surface 43. The increased reflection film is formed by sequentially laminating an undercoating, an aluminum vapor deposition film, a SiO ₂ film, and a TiO ₂ film on the surface of the reflector 41 made of aluminum.
In this way, the reflectance of the primary reflected light is set to 90% or more, so that the intensity of the primary reflected light is increased, and as a result, the instrument efficiency is also increased.

As described above, according to the present embodiment, the light emitting portion 63 of the LED package 35 is disposed in the opening of the concave reflecting surface 43 having the bottom 43A opened, and the irradiation range β of the primary reflected light of the concave reflecting surface 43, and The irradiation range α of direct light passing through the concave reflecting surface 43 is made substantially the same.
With this configuration, the irradiation light intensity is increased, and the occurrence of illuminance unevenness and color unevenness is prevented by direct light and primary reflected light irradiating the same range.
And by these effects, the light quantity of the LED package 35 is efficiently used for irradiation, the energy saving effect is high, and the optimum light quality as general floodlighting is realized. In addition, it is possible to reduce the number of lamps when projecting and illuminating an object to be irradiated, and as a result, it is possible to contribute to the reduction of CO ₂ which has been attracting attention due to recent environmental problems.

  In addition, according to the present embodiment, the LED package 35 emits irradiation light having a substantially rectangular irradiation shape. Therefore, by simply arranging planar inclined surfaces on the front, rear, left, and right sides of the light emitting unit 63 in accordance with the irradiation shape, The concave reflecting surface 43 that makes the irradiation range of the reflected light and the direct light the same can be easily configured.

  Furthermore, according to the present embodiment, a reflective film or silver is deposited on the entire concave reflection surface 43, and the reflectance of the concave reflection surface 43 is set to 90% or more, so that the intensity of the primary reflected light is increased. As a result, the LED projector 1 excellent in appliance efficiency is realized.

  It should be noted that the above-described embodiment is merely an aspect of the present invention, and can be arbitrarily modified and applied within the scope of the present invention.

1 LED lighting equipment (LED floodlight)
7 Lighting fixture body 33 Light source unit 35 LED package 37 Ceramic plate 41 Reflector 43 Concave reflective surface 43A Bottom portion 61 LED substrate 63 Light emitting portion 65 LED
α Direct light irradiation range β Primary reflected light irradiation range

Claims (3)

In an LED lighting apparatus having an LED as a light source,
The LED is configured by arranging a plurality of LED elements in a planar shape to emit a substantially rectangular planar light,
A luminaire main body is provided with a reflector having a concave reflecting surface with an opening at the bottom, and the LED is disposed at the opening at the bottom.
The concave reflection surface is constituted by planar inclined surfaces arranged on the front, rear, left and right of the LED in accordance with the substantially rectangular surface light of the LED,
The entire flat inclined surface of the concave reflecting surface is vapor-deposited so that the reflectance of the concave reflecting surface is 90% or more, the irradiation range of the primary reflected light of each flat inclined surface of the concave reflecting surface, and the concave reflecting surface An LED illuminator characterized in that the irradiation range of the direct light passing through is made substantially the same. A plurality of the LEDs are arranged side by side at a predetermined interval, and the concave reflecting surface is provided on the reflector corresponding to each LED to project and illuminate a substantially rectangular region. The LED lighting apparatus according to 1. The LED lighting apparatus according to claim 1, wherein an increased reflection film or silver is provided on the entire surface of the reflector including the concave reflection surface.

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