JP2005101296A - Device, module, and lighting apparatus of variable color light emitting diode - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a variable color light emitting diode device capable of changing color temperature by only varying one parameter and making the adjustment to bring the radiation close to blackbody radiation unnecessary wherein only two kinds of LED chips and thus two systems of wiring/control circuits are used. <P>SOLUTION: In the variable color light emitting diode device a monochromatic light emitting portion consisting of an LED for monochromatically emitting light, and a white light emitting portion including another LED chip, are so wired and arranged that their respective light emissions can independently be controlled. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a variable color light emitting diode element obtained by independently wiring and molding a plurality of light emitting diode chips having different light emission colors mainly used for illumination, a variable color light emitting diode module using the same, and a variable color light emitting diode illumination. It relates to the instrument.

  11 and 12 show conventional variable color LEDs in which a plurality of light emitting diode (LED) chips having different light emission colors disclosed in, for example, Patent Document 1 or Patent Document 2 are independently wired and molded integrally. It is a top view of an element. As shown in the figure, a red LED chip 1, a green LED chip 2, and a blue LED chip 3 are molded as a single element 4 in a container 5 with a transparent epoxy resin 6. Each LED chip has one pole connected to the common terminal 7 via the common pattern 11 and the other pole connected to separate terminals 8, 9, 10.

  When the LED chip is connected so that the side connected to the common terminal 7 is, for example, the minus side, a power supply system (not shown) in which the current is separately controlled to the plus side terminals 8, 9, 10 of the other LEDs. )), Light emission can be obtained, and for each current that flows, the current value is controlled or the pulse width is controlled, so that each light emission can be controlled separately to create a wide range of colors. Can do. In this example, since three primary colors of red, green, and blue are used, most colors that can be identified by humans can be reproduced.

In Patent Document 1 and the like, light from different LED chips is mixed by adding a light dispersant to an epoxy resin. The conventional variable color LED elements shown in FIGS. 11 and 12 are not necessarily required because of the wide light distribution type having no lens on the front surface. However, when more uniform light is required, the light dispersing agent is an epoxy resin. May be put in.
Japanese Patent No. 2790237 Japanese Patent No. 2822819

  On the other hand, in the field of general lighting, particularly home lighting, there is a strong demand for a fluorescent lamp and an incandescent lamp that are currently mainstream so that the color temperature can be changed with a single light source according to the atmosphere. For general lighting, a change within a range close to black body radiation and a color temperature of 2700K to 8000K is required. For example, if you want to create a calm atmosphere, the color temperature is 3000K, a vibrant atmosphere For example, the color temperature is as high as 7000K. That is, although it is desired to change the light source color, it is in a fairly narrow range, for example, there is no need for a light source color that is close to a primary color or a single color such as red, yellow, green, blue, etc. In some cases, the atmosphere becomes unpleasant.

  When the three primary colors are used as in the conventional variable color LED elements of FIGS. 11 and 12, the ratio of the two of red / green and blue / green is set within a certain range in order to make the range suitable for general illumination. Must be adjusted. In addition, since three types of LED elements must be controlled independently, three lines of wiring are required, and three control circuits are also required. As described above, the conventional variable color LED element has a problem that the circuit configuration of the element itself, the circuit configuration for controlling the element, and the control method are complicated.

  The present invention has been made to solve the above-mentioned problems, and has only two types of LED chips, thereby having two lines of wiring and control circuits, and further moving only one parameter. An object of the present invention is to obtain a variable color light emitting diode element, a variable color light emitting diode module, and a variable color light emitting diode lighting fixture that can change the color temperature and do not require adjustment to be close to black body radiation.

  In the variable color light emitting diode element according to the present invention, a single color light emitting portion composed of a single color LED chip and a white light emitting portion including another LED chip are wired and arranged so that light emission can be controlled independently. It is characterized by.

  In the variable color light emitting diode element according to the present invention, the white light emitting portion includes a blue LED chip that emits blue light and a phosphor that emits yellow light.

  Further, the variable color light emitting diode element according to the present invention is provided with a first resin in which a phosphor emitting yellow light is dispersed so as to cover the blue LED chip, and further including the first resin and the monochromatic light emitting part. Is molded by covering with a transparent second resin.

  In the variable color light emitting diode element according to the present invention, the main wavelength of light emission of the monochromatic light emitting portion is set to yellow or orange of 575 to 590 mm, and the color temperature of the white light emitting portion is set to a high color temperature of 5000 to 9000K. Features.

  The variable color light emitting diode element according to the present invention is characterized in that the primary wavelength of light emission of the monochromatic light emitting portion is blue of 470 to 485 mm and the color temperature of the white light emitting portion is low color temperature of 2700 to 5000K. .

  The variable color light emitting diode element according to the present invention includes a first white light emitting portion including an LED chip, and a second white light emitting portion including the LED chip that has a correlated color temperature lower than 2000K by a luminescent color. A white light-emitting portion, and the two types of white light-emitting portions are wired and molded so that light emission can be controlled independently of each other.

  The variable color light emitting diode element according to the present invention is characterized in that the DUV (JIS Z 8725) of the emission color of the white light emitting portion is set to -6 or more and 6 or less.

  A variable color light emitting diode module according to the present invention uses the variable color light emitting diode element according to any one of claims 1 to 7.

  The variable color light emitting diode module according to the present invention is characterized in that one terminal of the LED chip included in the variable color light emitting diode element is shared.

  The variable color light emitting diode module according to the present invention is characterized in that all positive and negative terminals of each LED chip included in the variable color light emitting diode element are made independent.

  A variable color light emitting diode lighting fixture according to the present invention is characterized in that the variable color light emitting diode module according to any one of claims 8 to 10 is used.

  In the variable color light emitting diode element according to the present invention, a single color light emitting portion composed of a single color LED chip and a white light emitting portion including another LED chip are wired and arranged so that light emission can be controlled independently. By molding, it is only necessary to change the ratio of the two kinds of signals for controlling the two kinds of light emitting portions, and a variable color LED element having a light emission color suitable for general illumination can be obtained within a wide range of this ratio. it can.

  The first white light-emitting portion including the LED chip and the second white light-emitting portion including the LED chip, the correlated white temperature of the light emission color being 2000K or lower are provided. Similarly, it is only necessary to change the ratio of the two kinds of signals for controlling the two kinds of light emitting parts by wiring and molding the white light emitting parts so that the light emission can be controlled independently, and this ratio is wide. A variable color LED element having an emission color suitable for general illumination in a range can be obtained.

  Furthermore, by using this variable color LED element to make a variable color LED module and further a variable color LED lighting fixture, a variable color LED module or a variable color LED lighting fixture capable of changing the emission color with a simple configuration can be obtained. .

Embodiment 1 FIG.
1 and 2 are diagrams showing Embodiment 1, FIG. 1 is a plan view of a variable color LED element, and FIG. 2 is a front view of the variable color LED element. In the figure, the monochromatic light emitting portion 21 is a yellow or orange LED chip having a dominant wavelength of approximately 575 nm to 590 nm, for example. In this case, the white light emitting portion 22 includes a blue LED chip 23 and a first resin layer 24 in which a yellow phosphor is dispersed in an epoxy resin provided to cover the chip.

  Each LED chip fixes and connects the bottom surface, which is one of the poles, to the common terminal 7 via the common pattern 11 which is a conductive portion of the substrate 25, and the other pole on the top surface of each LED chip. Separate terminals 8 and 9 are connected by bonding. Further, the entire upper surface is molded with the second resin layer 26. The yellow phosphor is, for example, an yttrium aluminate phosphor activated with Ce. Further, the height of the first resin layer is made uniform by the elliptic cylinder 27 and formed with good reproducibility.

  When the LED chip is connected so that the side connected to the common terminal 7 is, for example, the minus side, a power supply system (not shown) in which the current is separately controlled to the plus side terminals 8 and 9 of the other LEDs. ) To obtain light emission, and further, by controlling the current value or the pulse width of the current flowing through each of them, the x, y chromaticity of the light emission of the single color light emitting part alone in the x, y chromaticity coordinates. An arbitrary light source color on the line segment connecting the coordinates and the x and y chromaticity coordinates of the light emission of the white light emitting portion 22 alone can be obtained.

  The white light emitting portion 22 has a correlated color temperature of about 5000 K to 9000 K. In one example, the white light emitting portion 22 is about 6000 K, the DUV is −2.4, the main wavelength of the LED chip of the monochromatic light emitting portion 21 is 585 nm, and the half width. Of 20 nm. The ratio of the emission energy of the two types of light emitting portions was changed as described above, and the result is shown in FIG. In this example, it can even vary from about 6000K to about 3000K.

In order to investigate the allowable range of DUV, the living room was reproduced, the correlated color temperature was changed between 2600K and 9000K, and the DUV was changed, and the subject evaluated as an illumination space. as a result,
(1) In this correlated color temperature range, it is sufficient that the DUV is approximately −6 to +6, and if it falls outside this range, it may feel greenish or purple.
(2) In general illumination, a lamp having a correlated color temperature of 2700 K to 7000 K, and at most 8000 K may be used, as long as it can be changed within this range, but when the correlated color temperature on the high color temperature side is 8000 K or less, When the correlated color temperature changes by about 2000K, the atmosphere of the room changes, and it has become clear that it has value as variable color illumination.

  In the above example, as shown in FIG. 3, the DUV is in the range of −6 to 6 within the range where the correlated color temperature is changed, and it can be seen that light emission in a sufficient range for general illumination can be obtained.

  FIG. 4 is a diagram showing the first embodiment, and is a diagram showing the x and y chromaticity coordinates of the emission color. FIG. 4 shows black body radiation (DUV = 0) in the x and y chromaticity coordinates, curves of DUV of −6 and +6, and ideal chromaticity coordinates of monochromatic light emission with a half-value width of 0. The light emission of the above-described monochromatic light emitting portion here means peak light emission having a half width of about 20 nm or less, and in the region in question here, the chromaticity coordinates are close to the ideal chromaticity coordinates of monochromatic light emission.

  FIG. 5 is an enlarged view of a part of the x, y chromaticity coordinates. For example, if the correlated color temperature is changed from 4000 K to 4000 K with respect to a white light emitting portion having a correlated color temperature of 6000 K and DUV = 0, the DUV is limited to the range from 4000 K to 6000 K and from -6 to 6 in FIG. The area between the broken lines is the allowable range. Therefore, in this example, it can be seen from the intersection of this broken line and the curve indicating ideal monochromatic emission that the main wavelength of the monochromatic emission portion may be in the range of approximately 578 nm to 584 nm.

  Even when the light source color of the white light emitting portion has a light source color different from the above example and the range of the correlated color temperature to be changed is different, the main wavelength of the corresponding monochromatic light emitting portion is determined in the same way as the broken line in FIG. be able to. Assuming that the color temperature variable range is 2000K, the correlated color temperature of the white light-emitting portion may be in the range of 5000K to 9000K, and may be in the range indicated by the following formula.

(0.0002Tc-0.9) Duv-0.003Tc + 597 ≦ λ ≦ (0.00015Tc-0.05) Duv + 583.5
Where Tc is the correlated color temperature, Duv is DUV, and λ (nm) is the dominant wavelength.

  However, even if deviating from this range, the range of about 575 nm to 590 nm is not optimal, but it is functionally sufficient as a light source for illumination.

  The x and y chromaticity coordinates are those in the CIE1931 chromaticity diagram, and the definition / calculation method is based on JIS Z 8724, and the correlated color temperature and DUV are defined / calculated based on JIS Z 8725. The dominant wavelength is calculated by the method described in the New Color Science Handbook 2nd edition, p112, and x = 0.3333, y = 0.3333 is used as the white point.

  According to the above-described embodiment, the first resin in which the yellow phosphor is dispersed in the epoxy resin so as to cover the single-color light emitting portion 21 composed of the LED chip that emits yellow or orange light and the blue LED chip 23. The white light emitting portion 22 provided with the layer 24 is wired so that it can be controlled independently, and the entire upper surface is molded with the second resin layer 26, so that two types of signals for controlling the two types of light emitting portions can be obtained. It is only necessary to change the ratio, and it is possible to obtain a variable color LED element having a light emission color suitable for general illumination within a wide range of this ratio.

Embodiment 2. FIG.
In the second embodiment, in FIG. 1 or FIG. 2, the monochromatic light emitting portion 21 is blue, for example, an LED chip having a dominant wavelength of about 470 nm to 485 nm, and the white light emitting portion 22 has a low color temperature of about 2700K to 5000K. Unlike the first embodiment, the other configuration is the same as the color temperature.

  In this example, the white light emitting portion 22 includes a blue LED chip 23 and a first resin layer 24 in which phosphors having peaks at two positions of yellow and red are dispersed in an epoxy resin, and a correlated color temperature is from 2700K. It was set to 5000K. In one example, the emission color is changed from 3000K to 7000K by changing the emission output ratio by setting the correlated color temperature of the white light emitting portion 22 to about 3000K, DUV to 0, and the main wavelength of the monochromatic light emitting portion 21 to 483nm. Furthermore, since the DUV is in the range of -6 to 6 in the range of the correlated color temperature, a comfortable illumination space can be created.

  Also in this case, the dominant wavelength of the monochromatic light emitting portion 21 can be determined by the same method as shown in FIG. 5 using FIG. 6 in which FIG. 4 is enlarged, but if it is in the range of about 575 nm to 590 nm, Although not optimal, it is functionally sufficient as a light source for illumination.

  It should be noted that the phosphor that is a constituent element of the first resin layer 24 has a correlation color while keeping the absolute value of DUV small by activating a small amount of Eu in a so-called Ce-activated yttrium aluminate phosphor. Although the temperature is lowered, the same effect can be obtained by mixing another red phosphor and the yellow phosphor used in the example of the first embodiment.

Embodiment 3 FIG.
FIG. 7 is a diagram showing the third embodiment, and is a plan view of a variable color LED element. In the figure, the first white light emitting portion 22 is composed of a blue LED chip 23 and a first resin layer 24 in which a yellow phosphor is dispersed in an epoxy resin provided so as to cover this, for example, , And emit light at a high correlated color temperature of 6000K to 7000K. In this example, the second white light emitting portion 30 includes a blue LED chip 31 and a first resin layer 32 in which a yellow to orange phosphor is dispersed in an epoxy resin provided to cover the chip. The correlated color temperature is lower than that of the first white light emitting portion 22 by 2000K or more, for example, 3000K to 4000K.

  Each of the blue LED chips 23 and 31 is fixed and connected to the common terminal 7 via the common pattern 11 on the substrate, and the blue LED chips 23 and 31 are located on the upper surfaces of the blue LED chips 23 and 31, respectively. One pole is connected to separate terminals 8 and 9 by bonding.

  Further, the entire upper surface is molded with the second resin layer. In the phosphor, the first white light-emitting portion 22a has an yttrium aluminate phosphor activated with Ce in one example, and the second white light-emitting portion 30 has a small amount of Eu in addition to Ce in one example. It is an activated yttrium aluminate phosphor.

  In order to make the emission color variable by a minimum of 2000K as described above, a difference of at least 2000K is necessary for the correlated color temperature of the emission colors of the two types of white light emission portions. , DUV needs to be in the range of -6 to 6. 4 to 6, it is only necessary that the straight lines connecting the chromaticity coordinates of the first and second white light emitting portions are between DUV-6 and 6.

  For example, if the correlated color temperature is 7000 K and 3000 K, both DUVs should be between 0 and 6, and if the variable width of the correlated color temperature is 4000 K or less, approximately 0 ≦ DUV1 + DUV2, −3 ≦ DUV1 ≦ 6, −3 It can be seen that ≦ DUV2 ≦ 6 (however, DUV1 and DUV2 indicate the DUV of the first or second LED element, respectively).

Embodiment 4 FIG.
FIG. 8 is a diagram showing the fourth embodiment, and is a wiring diagram showing the variable color LED module. As shown in a part of FIG. 8, the variable color LED module according to the fourth embodiment fixes one or a plurality of variable color LED elements 40 according to the first to third embodiments on a substrate 41. Depending on the wiring pattern, the terminals 7, 8, and 9 of the variable color LED elements are wired independently, and the current is controlled in some cases.

  For example, resistors 42 and 43 are connected in series to terminals 8 and 9, respectively, and are connected to terminals 45 and 46 on the substrate. The terminal 44 is used as a common terminal, and for example, a voltage of a rectangular wave of 100 Hz having an independently controlled duty ratio is applied to the terminal 45 and the terminal 46 from different power sources to independently control the light emission output. Since the variable color LED elements of Embodiments 1 to 3 are used, a variable color LED module can be obtained.

  In this example, the light emission output is not controlled by directly changing a direct current voltage or current, but a constant direct current voltage is turned on and off at a constant frequency that is not visually flickering, for example, 100 Hz. (On) and the time t (off) between the off time and the light emission output is determined by t (on) / {t (on) + t (off)}. There is.

  Although the LED module of this example includes a resistor for controlling current, a power source connected to the LED module may have a function of limiting current.

  Furthermore, as a lighting fixture, this LED module and power supply are installed and fixed, and a mechanism for giving a signal for changing the light color from the outside to the power supply or a means for automatically changing the light color is provided, and the light is spatially controlled. In order to do so, a variable color LED lighting fixture can be obtained by providing the functions of a conventional lighting fixture such as providing a reflector or a diffuser.

  Of course, even if a phosphor of a different type from that exemplified in the first to third embodiments is used, the same effect can be obtained as long as the white light emission at the same position can be obtained even if the chromaticity coordinates are obtained. The white light emitting part of the different form used may be sufficient. For example, a combination of an LED chip that emits ultraviolet light and a three-wavelength phosphor that is a mixture of three types of phosphors may be used. A white light emitting portion may be formed.

  In any of the embodiments, one pole of the LED chip included in the LED element packaged in one is common, but this has the advantage that the element may be simple. On the other hand, all the positive and negative terminals of each element may be provided independently.

  FIG. 9 shows an example of an LED chip whose wiring is changed with respect to the first embodiment, and FIG. 10 shows a configuration example of an LED module using the LED chip. In this case, it is necessary to provide 6 terminals in the conventional device and 4 terminals in the first to third embodiments. However, in the case of a module, terminals of a plurality of elements corresponding to the same light color can be connected in series. There are advantages such that the number of resistors 42 and 43 can be reduced and a high voltage can be applied, and the usability is excellent. In FIG. 10, only two resistors are used for three variable color LED elements, and a direct current of 12 V is applied to each light color.

It is a figure which shows Embodiment 1, and is a top view which shows a variable color LED element. It is a figure which shows Embodiment 1, and is a front view which shows a variable color LED element. It is a figure which shows Embodiment 1, and is a figure which shows the emission energy ratio of LED element group, correlation color temperature, and DUV. It is a figure which shows Embodiment 1, and is a figure which shows luminescent color x and y chromaticity coordinate. FIG. 5 shows the first embodiment and is an enlarged view of FIG. 4 showing an example of the emission color. It is a figure which shows Embodiment 2, and is an enlarged view of FIG. 4 which shows an example of luminescent color. It is a figure which shows Embodiment 3, and is a top view which shows a variable color LED element. It is a figure which shows Embodiment 4, and is a wiring diagram which shows a variable color LED module. FIG. 6 is a diagram showing a fourth embodiment, and is a schematic arrangement / plan view showing variable color LED elements having different wiring patterns from those of the first embodiment. It is a figure which shows Embodiment 4, and is a schematic arrangement | positioning / wiring diagram which shows the variable color LED module from which a wiring pattern differs with respect to Embodiment 1. FIG. It is a top view which shows the conventional variable color LED element. It is a top view which shows the conventional variable color LED element.

Explanation of symbols

  7 common terminal, 8 and 9 terminal, 11 common pattern, 21 monochromatic light emitting part, 22 white light emitting part, 22a first white light emitting part, 23 blue LED chip, 24 first resin layer, 25 substrate, 26 second Resin layer, 27 Oval cylinder, 30 Second white light emitting portion, 31 Blue LED chip, 32 First resin layer, 40 Variable color LED element, 41 Substrate, 42, 43 Resistor, 44-46 Terminal of substrate.

Claims (11)

  Variable, characterized in that a monochromatic light-emitting portion comprising a light-emitting diode (hereinafter referred to as LED) chip that emits monochromatic light and a white light-emitting portion including another LED chip are wired and arranged so that light emission can be controlled independently. Color light emitting diode element.   2. The variable color light emitting diode element according to claim 1, wherein the white light emitting portion includes a blue LED chip that emits blue light and a phosphor that emits yellow light.   The first resin in which the phosphor that emits yellow light is dispersed is provided so as to cover the blue LED chip, and the whole including the first resin and the monochromatic light emitting portion is covered with a transparent second resin. 3. The variable color light emitting diode element according to claim 2, which is molded.   The main wavelength of light emission of the monochromatic light emitting portion is 575 to 590 mm yellow or orange, and the color temperature of the white light emitting portion is high color temperature of 5000 to 9000K. The variable color light-emitting diode element according to 1.   The main wavelength of light emission of the monochromatic light emitting portion is blue of 470 to 485 mm, and the color temperature of the white light emitting portion is low color temperature of 2700 to 5000K. Variable color light emitting diode element.   A first white light-emitting portion including an LED chip and a second white light-emitting portion including the LED chip and having a correlated color temperature of light emission color lower by 2000K or more are provided. A variable color light emitting diode element, wherein light emitting portions are molded by wiring so that light emission can be controlled independently.   The variable color light emitting diode element according to any one of claims 1 to 6, wherein a DUV (JIS Z 8725) of an emission color of the white light emitting portion is set to -6 or more and 6 or less.   A variable color light emitting diode module using the variable color light emitting diode element according to claim 1.   9. The variable color light emitting diode module according to claim 8, wherein one terminal of the LED chip included in the variable color light emitting diode element is shared.   9. The variable color light emitting diode module according to claim 8, wherein the positive and negative terminals of each LED chip included in the variable color light emitting diode element are all independent.   A variable color light-emitting diode illuminator using the variable color light-emitting diode module according to claim 8.

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