JP2009016153A - Led lamp for illumination - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED lamp bright for illumination, and with excellent red-color rendering properties. <P>SOLUTION: In the LED lamp for illumination, red, green and blue LED chips L1, L2, L3 are loaded as visible light regions, and a wavelength distribution near an incandescent lamp color is obtained by interpolating gaps between wavelengths of light irradiated from the LED chips L1, L2, L3 with phosphor materials. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an illumination LED lamp, and more particularly to an illumination LED lamp such as a product capable of obtaining a wavelength distribution close to an incandescent light bulb color.

Conventionally, in an LED lamp for illumination, whitening is performed by exciting a fluorescent material with a blue wavelength or an ultraviolet wavelength with respect to light from the LED lamp (Patent Documents 1 to 4 below). .
Japanese Patent No. 2927279 Japanese Patent No. 3503139 Japanese Patent No. 3700502 Japanese Patent Laid-Open No. 11-87784

  However, LED lamps that have been whitened using the conventional fluorescent material as described above have poor color rendering in the red region.

  When whitening is performed by exciting a fluorescent material with a blue wavelength or an ultraviolet wavelength as in the prior art, the output from the yellow to red region is insufficient, and it is difficult to obtain a light emitting region of 5000 Kelvin or less. It could not be used as an illumination lamp that requires color rendering properties such as color.

  For this reason, Red (Phosphor) that promotes light emission in the red region has been used to improve color rendering. However, it is not possible to obtain color rendering properties comparable to incandescent light bulb colors. It was in the state of a dark LED lamp. In other words, it has been difficult to produce an LED lamp that is completely compatible with an incandescent bulb.

  Under such circumstances, there has been a demand for an LED lamp that is bright for illumination and that can obtain a wavelength distribution close to incandescent light bulb color.

  In view of the above circumstances, an object of the present invention is to provide an LED lamp that is bright for illumination and has a wavelength distribution close to the color of an incandescent bulb.

In order to achieve the above object, the present invention provides
[1] In LED lamps for illumination, LED chips of Red (Red), Green (Green), and Blue (Blue) are mounted as visible light regions, and the wavelength of light emitted from these LED chips is interpolated with a fluorescent material. Thus, a wavelength distribution close to the incandescent light bulb color is obtained.

  [2] In the LED lamp for illumination, Red (red) and Blue (blue) LED chips are mounted as visible light regions, and Green (green) irradiated from the Red (red) and Blue (blue) LED chips. A wavelength distribution close to incandescent light bulb color is obtained by obtaining wavelengths and interpolating between wavelengths of light irradiated from those LED chips with a fluorescent material.

  [3] The LED lamp for illumination according to [1] or [2], wherein the fluorescent material is one type of fluorescent agent that is excited at a red (red) wavelength, a green (green) wavelength, and a blue (blue) wavelength, or It is characterized by comprising a cover in which a plurality of mixed fluorescent agents are arranged with a space between the LED chip.

  [4] The LED lamp for illumination according to [1], [2] or [3] above, wherein the fluorescent material is a phosphor.

  [5] The illumination LED lamp according to [3], wherein the cover is formed of a plate-like body.

  [6] The LED lamp for illumination according to [5] above, wherein the phosphor (phosphor) is coated on the plate-like body.

  [7] The illumination LED lamp according to [3], wherein the cover includes a lens.

  [8] The LED lamp for illumination according to [4] above, wherein the phosphor is coated on the lens.

  As described above, the LED lamp of the present invention is equipped with Red (red), Green (green), and Blue (blue) LED chips as a visible light region, and fluoresces between wavelengths of light emitted from these LED chips. By interpolating with the material, red color rendering is improved, that is, a wavelength distribution similar to incandescent light bulb color is obtained.

  The fluorescent material is excited by the blue wavelength, and the wavelength in the yellow region is emitted by the fluorescent material. However, LED chips of red to yellow wavelength do not participate in the fluorescent material, pass through the fluorescent material film, contribute to the color rendering property of the red region, and can obtain light emission of 3000 to 2500 Kelvin region, which is called incandescent light bulb color. .

  Using this method, Red (red) and Blue (blue) LED chips are mounted as the visible light region, and the wavelength of Green (green) emitted from the Red (blue) and Blue (blue) LED chips. And by interpolating between the wavelengths of light emitted from those LED chips with a fluorescent material, a wavelength distribution similar to the incandescent light bulb color is obtained. In particular, red color rendering can be improved.

  According to the present invention, the following effects can be achieved.

  By increasing the color rendering in the red region, it can be used for food product cases, clothing, and other image analysis.

  In the current white LED lamp, light emission in the red region is insufficient, and it is difficult to express the color tone of food, especially in meat, it is difficult to bring out the freshness of meat with the white LED lamp. It was.

  In particular, in the case of meat lighting using an incandescent bulb or a fluorescent lamp, the heat generated from the light source has caused problems in the temperature management of refrigerated cases and the like. For this reason, illumination with an LED lamp having an extremely small amount of heat generation has been sought, but the current white LED lamp cannot be used because the luminous efficiency of the red region is poor.

  The white LED lamp with improved red color region according to the present invention has a wavelength distribution similar to that of an incandescent light bulb in the visible light region, and is suitable for the food lighting field or clothing lighting that requires natural lighting. It became possible to suppress the heat generation from the lamp to the object.

  The LED lamp for illumination according to the present invention includes LED chips of red (red), green (green), and blue (blue) as visible light regions, and interpolates between wavelengths of light emitted from these LED chips with a fluorescent material. By doing so, a wavelength distribution close to incandescent light bulb color is obtained.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1 is an exploded perspective view of the LED lamp according to the first embodiment of the present invention with the front cover removed, and FIG. 2 is a perspective view of the LED lamp with the front cover installed.

  In these drawings, 1, 2 and 3 are metal frames, and the circuit configuration is made to mount LED chips L1, L2 and L3 of Red (red), Green (green), and Blue (blue). . Reference numeral 4 denotes a mold resin material containing metal frames 1, 2, and 3. The mold resin material 4 constitutes a frame on which the LED chips L1, L2, and L3 are mounted. Reference numeral 5 denotes a portion on which LED chips of Red (red), Green (green), and Blue (blue) are mounted.

  When the fluorescent material is directly applied onto the LED chips L1, L2, and L3, the fluorescent material is mixed and applied together with the LED chip wiring protection resin to complete the LED lamp.

  Reference numeral 6 denotes a surface cover when the fluorescent material is not directly applied onto the LED chips L1, L2, and L3. The surface cover 6 is formed by molding or the like and is bonded to the mold resin material 4. At that time, when the surface cover 6 is molded, a fluorescent material is mixed into the surface cover 6, or the fluorescent material arrangement part 7 of the surface cover 6 which is the surface of the surface cover 6 (the LED chip L1, L2, L3 neighboring surface). A fluorescent material is arranged on the screen by silk printing or coating. Further, the fluorescent material may be printed, applied, and sprayed in the form of fine particles on the front and back surfaces of the front cover 6.

  FIG. 3 is an exploded perspective view of the LED lamp according to the second embodiment of the present invention with the front cover removed, and FIG. 4 is a perspective view of the LED lamp with the front cover installed.

  The second embodiment is an LED lamp having a different shape from the LED lamp of the first embodiment.

  In these drawings, 11 is a metal frame, 12 is a mold resin material containing the metal frame 11, and the LED resin L1, L2 of Red (red), Green (green), and Blue (blue) by the mold resin material 12. , L3 is constructed. Reference numeral 13 denotes an arrangement site of the LED chips L1, L2, and L3.

  When the fluorescent material is directly applied onto the LED chips L1, L2, and L3, the fluorescent material is mixed and applied together with the LED chip wiring protection resin to complete the LED lamp.

  Reference numeral 14 denotes a lens-shaped molded article as a surface cover formed by molding or the like, and may contain a fluorescent material at the time of molding. When a fluorescent material is not contained at the time of molding, the fluorescent material is arranged on the LED chip L1, L2, L3 neighboring surface 15 by silk printing or coating. Further, the fluorescent material may be formed by spraying each part in the form of fine particles.

  FIG. 5 is a view showing an LED lamp having an incandescent lamp shape compatible with the incandescent lamp according to the third embodiment of the present invention.

  Reference numeral 21 denotes a base that conforms to a standard such as JIS, and has a fitting property with an incandescent bulb receiver. Reference numeral 22 denotes a control circuit portion such as a supply voltage and a portion where an LED lamp is installed. When the LED lamp already emits white light with the configuration of the first embodiment, the cover 23 which is a molded product is not necessary.

  When the LED lamp does not emit white light but has a multi-color configuration for improving color rendering, a fluorescent material is applied to the inside 24 of the cover 23, or when the cover 23 is molded, the fluorescent material is mixed with the molding resin and molded.

  The LED lamp manufactured in this way has the following color rendering characteristics.

  FIG. 6 is a wavelength distribution diagram of an LED lamp according to the combination of the LED chip of the present invention and a phosphor (phosphor). In this figure, the graph a is the wavelength distribution of the blue (blue) LED chip and the phosphor, the graph b is the wavelength distribution of the red (red), green (green), and blue (blue) LED chips, and the graph c is red (red). The wavelength distribution of LED chips and Phosphor of red), green (green), and blue (blue) is shown.

  This figure shows what wavelength distribution can be obtained by the combination of each LED chip and Phosphor.

  In FIG. 6, Blue + Phosphor, which is a graph a in FIG. 6, is a wavelength distribution by a combination of a Blue (blue) LED chip and a phosphor, Phosphor. It turns out that there is almost no.

  The RGB LED lamp which is the graph b is an LED lamp composed of LED chips of Red (red), Green (green), and Blue (blue). This LED lamp can express white color by adjusting the current value of the LED chips of each emission color, and can improve the color tone from 620 nm to 670 nm in the red region, but the light emission region around 590 nm (yellow) It is missing.

  RGB + Phosphor, which is a graph c, can excite Phosphor, which is a fluorescent material, with a blue (blue) LED chip for this yellow region, and can emit almost all wavelength regions in the visible light region. Such a light source can illuminate a food system including green vividly, and can also exert its effect in clothing illumination.

  FIG. 7 is a whitening wavelength distribution diagram of the LED lamp by the combination of the Blue (red) and Red (red) LED chips of the present invention.

  In FIG. 7, Blue + Red, which is graph a, is the wavelength distribution of an LED lamp equipped with two types of blue (blue) LED chip and red (red) LED chip. It is confirmed that there is no light emission from the green region to the orange region.

  A graph b obtained by adding Phosphor, which is a fluorescent material, to the Blue + Red LED lamp is a graph of the Red + Blue + Phosphor LED lamp, and it can be seen that light emission from the green region to the orange region is interpolated by the fluorescent material.

  The graph b of the Red + Blue + PhosphorLED lamp is close to the wavelength distribution of the incandescent bulb, and can be used as a fully compatible incandescent bulb as well as the RGB + Phosphor combination LED lamp.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The LED lamp for illumination of the present invention can be used as a lamp for illumination in fields where natural colors are required, such as freezing and refrigeration cases for goods, clothing lighting, and table lighting.

It is a disassembled perspective view of the state which removed the surface cover of the LED lamp which shows 1st Example of this invention. It is a perspective view of the LED lamp which shows the state which installed the surface cover of the LED lamp which shows 1st Example of this invention. It is a disassembled perspective view of the state which removed the surface cover of the LED lamp which shows 2nd Example of this invention. It is a perspective view of the LED lamp which shows the state which installed the surface cover of the LED lamp which shows 2nd Example of this invention. It is a figure which shows the LED lamp made into the incandescent lamp shape compatible with the incandescent lamp which shows 3rd Example of this invention. It is a wavelength distribution map of the LED lamp by the combination of the LED chip of this invention and Phosphor (phosphor). It is a whitening wavelength distribution map of the LED lamp by the combination of Blue (blue) and Red (red) LED chip of the present invention.

Explanation of symbols

1,2,3,11 Metal frame L1, L2, L3 Red (red), Green (green), Blue (blue) LED chip 4,12 Mold resin material 5 LED chip mounting part 6 Surface cover 7 Surface cover Fluorescent material placement site 13 LED chip placement site 14 Lens-shaped molded product (surface cover)
15 LED chip neighboring surface 21 Base 22 Supply circuit voltage control circuit part and LED lamp installation part 23 Cover 24 Inside cover

Claims (8)

Red (red), green (green), and blue (blue) LED chips are mounted as the visible light region, and by interpolating between the wavelengths of light emitted from these LED chips with a fluorescent material, it is close to incandescent light bulb color An LED lamp for illumination characterized by obtaining a wavelength distribution. Red (red) and blue (blue) LED chips are mounted as visible light regions, and the green (irradiation) wavelength emitted from the red (blue) and blue (blue) LED chips is obtained. The illumination LED lamp is characterized in that a wavelength distribution close to an incandescent light bulb color is obtained by interpolating between wavelengths of light irradiated from a fluorescent material. 3. The LED lamp for illumination according to claim 1, wherein the fluorescent material is one or more fluorescent materials that are excited at a red (red) wavelength, a green (green) wavelength, and a blue (blue) wavelength. An LED lamp for illumination, comprising an LED chip and a cover arranged with a space therebetween. 4. The LED lamp for illumination according to claim 1, wherein the fluorescent material is a phosphor. 4. The illumination LED lamp according to claim 3, wherein the cover is made of a plate-like body. 6. The LED lamp for illumination according to claim 5, wherein the phosphor is coated on the plate-like body. 4. The illumination LED lamp according to claim 3, wherein the cover includes a lens. 5. The LED lamp for illumination according to claim 4, wherein the phosphor is coated on the lens.

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