JP2015002178A - Led lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting fixture which improves color rendering properties of the LED lighting fixture without using an LED element having high color rendering properties.SOLUTION: An LED lighting fixture according to the invention includes a lamp support, and LED elements fixed to the interior of the lamp support. The LED elements include white light LED elements and a red light LED element. The lamp support includes a loading table and a recessed portion which is formed on the loading table being recessed. The white light LED elements are fixed to the loading table, and the red light LED element is fixed to the interior of the recessed portion.

Description

  The present invention relates to an LED lighting apparatus, and more particularly to an LED lighting apparatus having high color rendering properties.

  Light emitting diodes (LEDs) are widely used as light sources in the illumination region because they have advantages such as high brightness, low voltage, low power consumption, easy combination with ICs, easy driving and long life. A general white light LED element employing a conventional LED lighting apparatus is manufactured by combining a blue light LED chip and a yellow light phosphor. Specifically, the blue light emitted from the blue light LED chip and the yellow light emitted by the blue light exciting the yellow light phosphor are mixed to become white light. However, since the red light component is small in these, the color rendering is poor.

  In order to solve the problem of color rendering properties of LED lighting fixtures, most producers increase the color rendering properties of LED lighting fixtures through a method that employs high color rendering LED elements. However, in this case, the cost is increased and a general white light LED element cannot be used, resulting in a waste of production material.

  In view of the above problems, an object of the present invention is to provide an LED lighting device that can improve the color rendering properties of the LED lighting device without using a high color rendering LED element.

  In order to solve the above-mentioned problems, an LED lighting apparatus according to the present invention includes a lamp support and an LED element fixed inside the lamp support. The LED element includes a white light LED element and a red light LED element, the lamp support includes a loading table and a recess formed in the loading table, and the white light LED element includes the loading table. The red light LED element is fixed inside the recess.

  Unlike the prior art, the LED lighting fixture of the present invention does not use a high color rendering LED, changes the number of general white light LED elements and general red light LED elements, and the structural characteristics of the lighting fixture. Accordingly, it is possible to realize high color rendering and color temperature change in the LED lighting apparatus. Therefore, the manufacturer of the LED lighting apparatus can reduce the cost for developing a new product and diversify the usage method of the LED element. In addition, when an article is illuminated using the high color rendering LED lighting device of the present invention, a natural color can be exhibited. As a result, the LED lighting apparatus of the present invention can be used for color inspection and clinical inspection, and can also be used for places that require a high color rendering lamp such as a museum.

It is sectional drawing of the LED lighting fixture which concerns on this invention. It is a figure which shows the main part of the LED lighting fixture shown in FIG. It is a figure which shows contrast of CRI at the time of combining the white light LED element and red light LED element from which this invention differs. It is a figure which shows the layout of the white light LED element and red light LED element in the 1st comparative example of this invention. It is a figure which shows the layout of the white light LED element and red light LED element in the 2nd comparative example of this invention. It is a figure which shows the layout of the white light LED element and red light LED element in the 3rd comparative example of this invention. It is a figure which shows color temperature contrast at the time of combining the white light LED element and red light LED element from which this invention differs.

  As shown in FIGS. 1 and 2, the LED lighting apparatus according to the present invention includes a main body 10 and a housing 20. Each electronic component in the main body 10 is electrically connected to an external power source (not shown), and acquires electrical energy required when the LED lighting apparatus operates. The main body 10 is mechanically connected to the housing 20.

  The main body 10 includes a lamp support 100, a white light LED element 201, a red light LED element 202, a first light diffusion element 301, a second light diffusion element 302, and a first PCB board (not shown). And a second PCB board (not shown). The lamp support 100 includes a loading platform 101 and a recess 102 that is recessed in the middle of the loading platform 101. The first PCB board and the second PCB board are installed in combination on the loading table 101 and the recess 102, respectively, and mount the corresponding white light LED element 201 and red light LED element 202. The inner surface of the lamp support 100 is coated with a light reflecting paint for increasing the amount of light emitted from the LED lighting apparatus. Moreover, in order to increase the light emission amount of the LED lighting apparatus, a light reflecting sheet may be overlapped and joined to the first PCB plate and the second PCB plate. However, in order to reduce costs, it is preferable to omit the light reflecting sheet and employ a PCB board coated with a light reflecting paint.

  The white light LED element 201 is electrically connected to the first PCB board and is fixed to the upper surface of the loading platform 101 of the lamp support 100. The recess 102 of the lamp support 100 includes a side wall 1021 and a bottom 1022. The red light LED element 202 is electrically connected to the second PCB board and is fixed to the upper surface of the bottom 1022 of the recess 102. Such a structure increases the light mixing distance of the red light emitted from the red light LED element 202 and improves the uniformity of the light beam.

  Since the depression angle α between the side wall 1021 and the bottom portion 1022 of the lamp support 100 is 30 ° to 60 °, the red light emitted from the red light LED element 202 provided on the bottom portion 1022 is effectively reflected to reduce the light loss. Can be reduced. Since the loading table 101 surrounds the recess 102, the red light LED element 202 located at the bottom 1022 is surrounded by the white light LED element 201 provided on the loading table 101. Thereby, the uniformity of the mixed light of red light and white light can be improved. Since the forward voltage difference between the white light LED element 201 and the red light LED element 202 is large, the white light LED element 201 of the first PCB plate and the red light LED element of the second PCB plate of the LED lighting apparatus of the present invention. 202 are connected in series. As a result, non-uniform distribution of the current flowing through the white light LED element 201 and the red light LED element 202 is prevented, and each LED element is operated under high voltage and low current conditions to reduce energy consumption. Can do.

  The second light diffusing element 302 covers the opening above the recess 102 and diffuses the light emitted from the red light LED element 202. In addition, the present invention improves the uniformity of the red light passing through the second light diffusing element 302 by performing the fogging process on the second light diffusing element 302, and thins the red spots of the LED lighting apparatus. Can do.

  The first light diffusing element 301 covers the opening of the lamp support 100 and white light emitted from the red light and white light LED elements 201 after being diffused by the second light diffusing element 302 from the red light LED elements 202. Diffuses light. In addition, the present invention improves the uniformity of the light emitted by the LED lighting fixture by performing the fogging process on the first light diffusing element 301. The light transmittance of the first light diffusing element 301 is 70% to 90%. The light transmittance of the second light diffusing element 302 is 80% to 95%. When the vertical distance between the first light diffusing element 301 and the white light LED element 201 is controlled within a range of 3 cm to 10 cm, and the vertical distance is too small, the light mixing distance between the white light and the red light becomes small, and the LED The uniformity of the light of the luminaire also deteriorates. If the vertical distance is too large, not only the light loss is increased, but also the size of the LED lighting apparatus is increased, and the cost of the lamp support 100 and the housing 20 is increased.

  FIG. 3 is a contrast diagram of color rendering when the white light LED element 201 and the red light LED element 202 according to the present invention are combined. The ordinate Ra is an average color rendering index. The abscissa is a combination of different white light LED elements 201 and red light LED elements 202 and is shown in the xW + yR scheme. W represents the white light LED element 201, and R represents the red light LED element 202. The expression xW + yR means a combination of x white light LED elements 201 and y red light LED elements 202. The ratio of the quantity of the white light LED element 201 and the red light LED element 202 is x: y. For example, 2W + 1R means a combination of two white light LED elements 201 and one red light LED element 202. That is, the ratio of the quantity of the white light LED element 201 and the red light LED element 202 is 2: 1.

  As can be seen from FIG. 3, when only the white light LED element 201 is used, the average color rendering index of the LED lighting apparatus is smaller than 90. When the ratio of the quantity of the white light LED element 201 and the red light LED element 202 is in the range of 4: 1 to 1: 1, all the average color rendering evaluation numbers of the LED lighting fixtures are 90 or more. Further, when the ratio of the quantity of the white light LED element 201 and the red light LED element 202 is 2: 1, that is, when one red light LED element 202 is combined with two white light LED elements 201, the LED The average color rendering index of luminaires is the highest.

  As can be seen from the above description, the LED lighting apparatus of the present invention uses a general white light LED element 201 and a general red light LED element 202 without using a high color rendering LED, and a white light LED. Through the change in the number of the elements 201 and the red light LED elements 202 and the structural features of the lighting fixture, it is possible to realize high color rendering properties and a change in color temperature in the LED lighting fixture. In addition, manufacturers of LED lighting fixtures can reduce the cost of developing new products and diversify the use methods of LED elements.

  When an article is illuminated using the high color rendering LED luminaire of the present invention, natural colors can appear. Therefore, the LED lighting apparatus of the present invention can be used for color inspection and clinical inspection, and can also be used for a place such as a museum that requires a high color rendering lamp.

  When the ratio of the number of white light LED elements 201 and red light LED elements 202 of the LED lighting apparatus is 2: 1, FIG. 4 shows two white light LED elements 201 according to the first comparative example of the present invention and red light. FIG. 5 shows a layout of two white light LED elements 201 and a red light LED element 202 according to the second comparative example of the present invention.

  As shown in FIG. 4, one red light LED element 202 is located in the vicinity of the two white light LED elements 201. The light rays emitted by the white light LED element 201 and the red light LED element 202 are mixed and have a red halation visual effect after passing through the first light diffusing element 301 and the second light diffusing element 302.

  As shown in FIG. 5, one red light LED element 202 is located at the center of the two white light LED elements 201. Light beams emitted from the white light LED element 201 and the red light LED element 202 are mixed and pass through the first light diffusion element 301 and the second light diffusion element 302. At this time, red halation appears to have decreased, but red spots are still visible.

  As shown in FIG. 6, when the ratio of the number of white light LED elements 201 and red light LED elements 202 of the LED lighting apparatus is 4: 1, one red light LED is used in the third comparative example of the present invention. The element 202 is located at the center of the four white light LED elements 201, the light rays from the white light LED element 201 and the red light LED element 202 are mixed and diffused by the first light diffusing element 301 and the second light diffusing element 302. Is done. At this time, the light beam has high uniformity and no red spots are visible. That is, the LED lighting apparatus according to this comparative example not only has high color rendering properties, but also has uniform light rays.

  As shown in FIG. 7, the correlated color temperature CCT of white light emitted from a general white light LED element 201 is about 5000 K, and belongs to a cool color. On the other hand, the present invention constitutes an LED lighting fixture by combining the white light LED element 201 and the red light LED element 202. As a result, the color temperature of the LED lighting apparatus changes from a cold color to a warm color. Moreover, the quantity of the white light LED element 201 and the red light LED element 202 can be changed easily, and the color temperature of the said LED lighting fixture can be changed. Accordingly, the manufacturer of the LED lamp can shorten the development time of a new product.

  The LED lighting apparatus of the present invention further includes a heat radiating section (not shown). The heat radiating portion employs a porous material or fins having good thermal conductivity, and is in contact with the lamp support 100 and the housing 20, respectively. Moreover, the said heat radiating part is further provided with the fan electrically connected to the power supply of the said LED lighting fixture.

  In addition, in order to improve the heat dissipation of the LED lighting fixture and reduce the light attenuation of the LED element, a heat conductive paste is provided in advance at the bottom position in contact with the housing 20 of the lamp support 100, and then the lamp support 100. And the housing 20 are mechanically connected. Thereby, the heat radiation of the red light LED element 202 can be promoted, and the phenomenon that the luminous efficiency of the red light LED element 202 is attenuated as the temperature rises can be reduced.

DESCRIPTION OF SYMBOLS 10 Main part 100 Lamp support body 101 Loading stand 102 Recess 1021 Side wall 1022 Bottom part 20 Housing 201 White light LED element 202 Red light LED element 301 1st light diffusion element 302 2nd light diffusion element

Claims (8)

An LED lighting apparatus comprising a lamp support and an LED element fixed inside the lamp support,
The LED element includes a white light LED element and a red light LED element, the lamp support includes a loading table and a recess formed in the loading table, and the white light LED element includes the loading table. And the red light LED element is fixed inside the recess.   The LED lighting apparatus according to claim 1, wherein the white light LED element is provided so as to surround the red light LED element.   2. The LED lighting apparatus according to claim 1, wherein a ratio of a quantity of the white light LED element and the red light LED element is 4: 1 to 1: 1.   2. The LED lighting apparatus according to claim 1, wherein the recess includes a bottom portion and a side wall, and a depression angle between the bottom portion and the side wall is 30 degrees to 60 degrees.   The LED lighting apparatus further includes a first PCB board electrically connected to the white light LED element and a second PCB board electrically connected to the red light LED element, and is mounted by the first PCB board. 2. The LED lighting apparatus according to claim 1, wherein the white light LED element is connected in series with a red light LED element mounted by the second PCB plate.   The LED lighting apparatus is installed to cover the upper opening of the recess, and covers the second light diffusing element for diffusing the light emitted by the red light LED element, and the opening of the lamp support. The LED lighting apparatus according to claim 1, further comprising: a first light diffusing element that is installed so as to diffuse light emitted from the entire LED lighting apparatus.   The vertical distance between the first light diffusing element and the white light LED element is 3 cm to 10 cm, the light transmittance of the first light diffusing element is 70% to 90%, and the second light diffusing element. The LED light fixture according to claim 6, wherein the light transmittance is 80% to 95%.   8. The LED lighting apparatus according to claim 7, wherein the first light diffusing element and the second light diffusing element are fogged.

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