JP2022055685A - Multicolor LED light source device - Google Patents

Abstract

To provide a multicolor LED light source device, high in color rendering properties of synthetic white light, wide in chromaticity range when emitting a single color, less in color unevenness, capable of reducing a light emitting surface, less in temperature dependency, or high in luminous output.SOLUTION: A multicolor LED light source device includes: a blue light emitting unit 20 comprising a plurality of LED chips; a red light emitting unit 30 comprising a plurality of LED chips; a green light emitting unit 40 comprising a plurality of LED chips; and a mounting board having a light emitting surface comprising a plurality of groove-shaped mounting parts 12 arranged in parallel and a plane mounting part 11 provided between the plurality of groove-shaped mounting parts. The blue light emitting unit 20 is provided on the plane mounting part 11, and the red light emitting unit 30 and the green light emitting unit 40 are provided on the respective groove-shaped mounting parts 12.SELECTED DRAWING: Figure 1

Description

The present invention relates to a multicolor LED light source device suitable for use in stage lighting and the like.

In recent years, LED lighting fixtures have been used, and there is a demand for LED lighting in stage lighting such as theaters as well. However, stage lighting has high requirements for color unevenness and color rendering properties, and there are the following problems in converting stage lighting to LED. That is, in the conventional multi-color LED light source device, (1) the multi-light source method is the mainstream, so that the light emitting surface is large and the models that can be applied as stage lighting are limited, and (2) the adjacent LED chips are separated from each other. Therefore, the emission color appears on the contour and shadow of the irradiation surface. (3) The temperature characteristics of the LED chip differ depending on the wavelength range. For example, the LED chip in the long wavelength range such as red and amber is due to the temperature rise. Since the decrease in illuminance is relatively large and the decrease in illuminance due to temperature rise is relatively small for LED chips in the short wavelength range such as blue and green, the red LED chip that emits red light, the green LED chip that emits green light, and the blue light In an LED light source in which three of the blue LED chips that emit light are mixed, the color synthesized by mixing the three primary colors of red, green, and blue changes as the temperature rises after lighting, and lighting and extinguishing are repeated. It may be difficult to use in scenes, etc. (4) The light source spectrum of the LED chip itself has a narrow wavelength range, and the light synthesized by the red LED chip, green LED chip, and blue LED chip has low color playability. Low color reproducibility, (5) SMD (Surface Mount Device) used in the multi-light source method has a large thermal resistance, and it is necessary to suppress the LED chip output in order to prevent the temperature rise of the LED chip, resulting in high output. There are things you can't do.

For example, regarding the problem of the temperature characteristic of (3) above, Patent Document 1 discloses that the current value of each color is adjusted while monitoring the temperature using a temperature sensor, but the control is complicated and the lighting system is used. There was a problem that the cost was high. Further, regarding the problem of color rendering property in (4) above, there is a problem that the color rendering property is improved by increasing the types of colors (wavelengths), but the material cost and the assembly cost are increased.
Further, Patent Document 2 discloses that a phosphor is used to develop a color of green or red to improve color rendering, but the stimulus purity of red or green is low (the color is light) and the range of color coordinates that can be reproduced. There was a problem that it was narrow.

JP-A-2017-201572 Japanese Unexamined Patent Publication No. 2008-283155

An object of the present invention is to make it possible to provide a multicolor LED light source device suitable for stage lighting of a theater at low cost. Specifically, the color rendering property of synthetic white light is high, the chromaticity range at the time of single color emission is wide, the color unevenness is small, the light emitting surface can be made small, the temperature dependence is small, or the emission output is high. An object of the present invention is to provide a multicolor LED light source device.

The multicolor LED light source device according to the first aspect of the present invention is parallel to a blue light emitting unit composed of a plurality of LED chips, a red light emitting unit composed of a plurality of LED chips, and a green light emitting unit composed of a plurality of LED chips. The blue light emitting unit comprises a plurality of arranged groove-shaped mounting portions and a mounting substrate having a light emitting surface composed of a flat mounting portion provided between the plurality of groove-shaped mounting portions. The red light emitting unit and the green light emitting unit are provided in the flat mounting portion, and the green light emitting unit is provided in the groove-shaped mounting portion.
The multicolor LED light source device according to the first aspect may be characterized in that the red light emitting unit and the green light emitting unit are alternately arranged with the blue light emitting unit interposed therebetween.
The multicolor LED light source device according to the first aspect may be characterized in that the blue light emitting unit includes five or more LED chips, and each of the red light emitting unit and the green light emitting unit includes four or more.
The multicolor LED light source device according to the first aspect may be characterized in that the plurality of LED chips constituting the blue light emitting unit, the red light emitting unit, and the green light emitting unit are blue LED chips having the same specifications.
In the multicolor LED light source device of the first aspect, the blue light emitting unit has a unit row unit composed of a plurality of blue LED chips having a first peak wavelength and a second peak different from the first peak wavelength. It may be characterized by including a unit row unit composed of a plurality of blue LED chips having a wavelength.

The multicolor LED light source device according to the second aspect of the present invention is a first color light emitting unit composed of a plurality of LED chips, a second color light emitting unit composed of a plurality of LED chips, and a third color composed of a plurality of LED chips. With a light emitting unit, a fourth color light emitting unit composed of a plurality of LED chips, a plurality of groove-shaped mounting portions arranged in parallel, and a flat mounting portion provided between the plurality of groove-shaped mounting portions. A mounting substrate having a light emitting surface to be configured is provided, and the first color light emitting unit is provided in the plane mounting portion, and the second color light emitting unit, the third color light emitting unit, and the fourth color light emitting unit are provided. The units are sequentially provided in the groove-shaped mounting portions.
In the multicolor LED light source device according to the second aspect, the plurality of LED chips included in the first color light emitting unit may be blue LED bare chips and may be characterized in that they emit blue light.
In the multicolor LED light source device of the second aspect, the first color light emitting unit is a unit row unit composed of a plurality of blue LED chips having a first peak wavelength, and a second unit different from the first peak wavelength. It may be characterized by comprising a unit row unit composed of a plurality of blue LED chips having a peak wavelength of.
In the multicolor LED light source device of the second aspect, the second color light emitting unit emits red light, the third color light emitting unit emits green light, and the fourth color light emitting unit emits yellow light and yellowish green. It may be characterized by emitting light or orange light.
The multicolor LED light source device according to the second aspect may be characterized in that the plurality of LED chips constituting the respective color light emitting units are blue LED chips having the same specifications.

In the multicolor LED light source device according to the first aspect and the second aspect, the color units may be arranged so that the light emitted by the color light emitting units does not interfere with each other.
In the multicolor LED light source device of the first aspect and the second aspect, the groove-shaped mounting portion has a depth of 0.5 to 1.5 mm and a width of 1.0 to 2.5 mm. May be.
The multicolor LED light source device of the first aspect and the second aspect may be characterized in that the light emitting surface is a regular polygon of hexagon or more.
The multicolor LED light source device of the first aspect and the second aspect may be characterized in that the color rendering property at a color temperature of 5000 to 6500K exceeds Ra90.

According to the present invention, the color rendering property of synthetic white light is high, the chromaticity range at the time of single color emission is wide, the color unevenness is small, the light emitting surface can be made small, the temperature dependence is small, or the emission output is low. It becomes possible to provide a high-color LED light source device at low cost.

It is a side sectional view of the multicolor LED light source apparatus which concerns on 1st Embodiment. It is a top view of the multicolor LED light source apparatus which concerns on 1st Embodiment. It is a side sectional view of the conventional multi-color LED light source device. (A) is a figure which shows the emission spectrum of the conventional multicolor LED light source apparatus, (B) is a figure which shows the emission spectrum of the multicolor LED light source apparatus which concerns on 1st Embodiment. It is a top view of the multicolor LED light source apparatus which concerns on 2nd Embodiment. (A) is a diagram showing the emission spectrum of the multicolor LED light source device according to the first embodiment, and (B) is a diagram showing the emission spectrum of the multicolor LED light source device according to the second embodiment. It is a top view of the multicolor LED light source apparatus which concerns on 3rd Embodiment. (A) is a diagram showing the color covered by the conventional multicolor LED light source device in chromaticity coordinates, and (B) is a diagram showing the color covered by the multicolor LED light source device according to the third embodiment with chromaticity. It is a figure shown in coordinates. (A) to (C) are diagrams showing an example of the measurement result of the color playability for each color temperature of the conventional multicolor LED light source device, and (D) is the figure of the multicolor LED light source device according to the first embodiment. It is a figure which shows the example of the measurement result of the color playability of a color temperature of 3000K, (E)-(G) is an example of the measurement result of the color playability for each color temperature of the multicolor LED light source apparatus which concerns on 4th Embodiment. It is a figure which shows.

<< First Embodiment >>
Hereinafter, the multicolor LED light source device 100 according to the first embodiment will be described with reference to the drawings. FIG. 1 is a side sectional view of the multicolor LED light source device 100 according to the present embodiment, and FIG. 2 is a plan view of the multicolor LED light source device 100 according to the first embodiment. Further, FIG. 3 is a side sectional view of the conventional multicolor LED light source device 100'.

As shown in FIG. 1, the multicolor LED light source device 100 according to the first embodiment includes a mounting substrate 10, a first color light emitting unit 20 that emits blue light, and a second color light emitting unit 30 that emits red light. A COB (Chip on board) light source having an input power of about 200 W, which includes a third color light emitting unit 40 that emits green light, a dam material 50, and a transparent resin layer 60.

The mounting substrate 10 is a substrate on which the LED chip 1 is mounted, and is made of a material having excellent thermal conductivity, for example, a copper plate, an aluminum plate, or a ceramic substrate (alumina or alumina nitride substrate). Further, although not shown in FIG. 1, when the mounting substrate 10 is a metal substrate, the mounting surface of the LED chip 1 has an insulating layer made of resin or the like. As such an insulating layer, for example, an ink in which white inorganic powder (white inorganic pigment) and silicon dioxide (SiO ₂ ) are the main components and mixed with a solvent of diethylene glycol monobutyl ether containing organic phosphoric acid is printed on a screen. It is possible to adopt an inorganic white insulating layer formed by heating after coating with.

Further, as shown in FIGS. 1 and 2, the mounting substrate 10 according to the present embodiment has a dodecagonal shape including a flat mounting portion 11 and a groove-shaped mounting portion 12 on the mounting surface side of the LED chip 1. It constitutes a light emitting surface. As shown in FIGS. 1 and 2, the groove-shaped mounting portion 12 is configured by forming a plurality of linear grooves on the mounting substrate 10. The groove-shaped mounting portion 12 has a depth of, for example, 0.5 to 1.5 mm and a width of 1.0 to 2.5 mm. Further, the plurality of groove-shaped mounting portions 12 are provided on the mounting substrate 10 at regular intervals, and the flat surface mounting portions 11 are provided between the plurality of groove-shaped mounting portions 12.
In the present embodiment, the pair of groove-shaped mounting portions 12 located on the outermost side are provided with the second color light emitting unit 30 that emits red light, but the combination is not limited to this, and the pair on the outermost side is located. A third color light emitting unit 40 that emits green light may be installed in the groove-shaped mounting portion 12. The light emitting surface surrounded by the dam material 50 can be a quadrangle, but since it is preferable to have a symmetrical shape close to a circle, a hexagon is preferable to a quadrangle, an octagon is preferable to a hexagon, and an octagon. A decagon is preferable, and a dodecagon is preferable to a decagon.

In the first color light emitting unit 20 that emits blue light, unit row units (shown by dotted lines in FIG. 2) composed of a plurality of LED chips 1 connected in series on a plane mounting portion 11 are arranged in parallel. Consists of. The unit row units of the first color light emitting unit 20 except for the unit row unit provided at the outermost end in the orthogonal direction to the unit row unit are arranged in parallel with the groove-shaped mounting portion 12 interposed therebetween. The plurality of LED chips 1 constituting the first color unit row unit are connected in series, and the plurality of first color unit row units are connected in parallel. The dimensions of the LED chip 1 used in each color light emitting unit 10 to 30 are 0.61 mm × 0.61 mm × 0.15 mm, and all have the same specifications. The specifications of the LED chip 1 are not particularly limited, but in the present embodiment, the LED bare chip using a gallium nitride based semiconductor and having a peak wavelength of 445 nm to 470 nm including a near blue region is used.
Since the transparent resin layer 60 is not provided with the phosphor layer, the first color light emitting unit 20 according to the present embodiment emits blue light emitted from the plurality of LED chips 1 to the outside. Although not shown, the LED chip 1 is connected to an external electrode by wire bonding, flip chip mounting, or the like.

The second color light emitting unit 30 emits light in the red wavelength range. In the present embodiment, as shown in FIG. 2, in the second color light emitting unit 30, a plurality of LED chips 1 are arranged in a row on the flat bottom surface of the groove-shaped mounting portion 12 of the mounting substrate 10, and a plurality of LED chips are arranged. The unit row unit is formed by filling the groove-shaped mounting portion 12 in which 1 is arranged and curing the phosphor-containing resin to form the phosphor-containing resin layer 31. The plurality of LED chips 1 constituting the second color unit row unit are connected in series, and the plurality of second color unit row units are connected in parallel. The fluorescent substance-containing resin forming the fluorescent substance-containing resin layer 31 is a translucent resin containing a fluorescent substance (for example, an epoxy-based resin, a silicone-based resin, and an acrylic-based resin), and the type of the phosphor is particularly limited. However, in the present embodiment, a nitride-based, oxynitride-based, oxide-based, or sulfide-based red fluorescent material is used in order to emit red light. As such a red phosphor, for example, a SCASN-based phosphor represented by the chemical formula (Sr, Ca) AlSiN3: Eu, a CASN-based phosphor represented by the chemical formula CaAlSiN3: Eu, and the like can be used. In order to reduce the leakage of blue light from the LED chip 1, it is desirable that the mixing ratio of the phosphor to the resin in the phosphor-containing resin layer 31 is 35% by weight or more and the resin thickness is 0.5 mm or more (third). The same applies to the color light emitting unit 40). The width of the groove-shaped mounting portion 12 is set in the range of adding, for example, 0.5 to 1.0 mm to the width of the LED chip 1.

The third color light emitting unit 40 emits light in the green wavelength range. In the present embodiment, as shown in FIG. 2, the third color light emitting unit 40 has a plurality of LED chips 1 arranged in a row on the flat bottom surface of the groove-shaped mounting portion 12 of the mounting substrate 10, and the plurality of LED chips. A unit row unit is formed by filling a phosphor-containing resin different from the second color light emitting unit 30 in the groove-shaped mounting portion 12 in which 1 is arranged and curing the phosphor-containing resin layer 41 to form the phosphor-containing resin layer 41. There is. The plurality of LED chips 1 constituting the third color unit row unit are connected in series, and the plurality of third color unit row units are connected in parallel. The fluorescent substance-containing resin forming the fluorescent substance-containing resin layer 41 is a translucent resin containing a fluorescent substance (for example, an epoxy-based resin, a silicone-based resin, and an acrylic-based resin), and the type of the phosphor is particularly limited. However, in the present embodiment, a nitride-based, oxynitride-based, oxide-based, or sulfide-based green phosphor can be used in order to emit green light. Examples of such a green phosphor include a LuAG-based phosphor which is a green phosphor represented by the chemical formula Lu ₃ Al ₅ O12: Ce and a scandium which is a green phosphor represented by the chemical formula _{CaSc 2 O 4} : Ce. An oxide fluorescent substance, a sialon-based fluorescent substance which is a green fluorescent substance represented by the chemical formula SiAlON: Eu, or the like can be used. In order to reduce the leakage of blue light from the LED chip 1, it is desirable that the mixing ratio of the phosphor to the resin in the phosphor-containing resin layer 31 is 35% by weight or more and the resin thickness is 0.5 mm or more.

As described above, in the multicolor LED light source device 100 according to the first embodiment, as shown in FIG. 1, the second color light emitting unit 30 that emits red light and the blue light are emitted from the center line P toward the upper and lower ends. The first color light emitting unit 20 that emits light, the third color light emitting unit 40 that emits green light, and the first color light emitting unit 20 that emits blue light are provided in this order, respectively. In this way, by alternately forming the second color light emitting unit 30 and the third color light emitting unit with the first color light emitting unit 20 interposed therebetween, the light colors of the multicolor LED light source device 100 are uniformly mixed. It enables the color unevenness of light to be suppressed.

Further, in the present embodiment, the distance in the plane direction between the LED chips of different color light emitting units (for example, the LED chip 1 of the first color light emitting unit 20 and the LED chip 1 of the second color light emitting unit 30 shown in FIG. 1 The distance L1 and the distance between the LED chip 1 of the first color light emitting unit 20 and the LED chip 1 of the third color light emitting unit 40) are set to 3.0 mm or less, which is shorter than the conventional multicolor LED light source device. , The LED chips 1 are arranged at high density, and the light emitting surface of the multicolor LED light source device 100 is made small (the distance between chips in the conventional SMD is about 4 mm at the minimum). The light emitting surface of the multicolor LED light source device 100 of the present embodiment is a regular dodecagon having an outer diameter of 45 mm. Here, in the conventional multicolor LED light source device, as shown in FIG. 3, the LED chips 1 are arranged on the mounting substrate 10'on the same plane. Therefore, when the distance between the LED chips 1 is shortened, the first The blue light emitted by the color light emitting unit 20 is incident on the phosphor-containing resin layer 31'of the second color light emitting unit 30'and the phosphor-containing resin layer 41' of the third color light emitting unit 40', and is blue. There is a problem that the stimulus purity at the time of developing the color is lowered and the color becomes lighter.

On the other hand, in the multi-color LED light source device 100 according to the present embodiment, the second color light emitting unit 30 and the third color light emitting unit 40 are configured in the groove-shaped mounting portion 12 of the mounting substrate 10. As shown in 1, the blue light emitted by the first color light emitting unit 20 is incident on the phosphor-containing resin layer 31 of the second color light emitting unit 30 and the phosphor-containing resin layer 41 of the third color light emitting unit 40. Since this can be prevented, the stimulus purity of blue light emission is improved, and the range of reproducible color coordinates is expanded. Further, in the multicolor LED light source device 100 according to the present embodiment, as described above, since the light emitting surface of the multicolor LED light source device 100 can be made smaller, the type of lighting equipment on which the multicolor LED light source device 100 can be mounted. The number increases, and the effect of increasing the versatility of the multicolor LED light source device 100 is also achieved. In the present embodiment, the mounting board 10 is a multilayer wiring board so as not to intersect with the wiring of the light emitting units of different colors when forming the wiring for consolidating the plurality of light emitting units of the same color arranged in parallel to one electrode. Is preferable.

In the present embodiment, the fluorescent substance-containing resin is filled in each of the plurality of LED chips 1 arranged in the groove-shaped mounting portion 12 and heated, whereby the fluorescent substance-containing resin layer is contained in the groove-shaped mounting portion 12. 31 and 41 are formed to form a second color light emitting unit 30 and a third color light emitting unit 40. Further, after the phosphor-containing resin is cured, the translucent resin is filled in the dam material 50 to be placed on the first color light emitting unit 20, the second color light emitting unit 30, and the third color light emitting unit 40. , A transparent resin layer 60 containing no phosphor is formed.

As described above, in the multicolor LED light source device 100 according to the present embodiment, the plurality of groove-shaped mounting portions 12 and the plurality of groove-shaped mounting portions 12 extend in parallel with the mounting surface of the mounting substrate 10. The first color light emitting unit 20 is formed on the plane mounting portion 11 alternately, and the second color light emitting unit 30 is formed in the groove-shaped mounting portion 12, and the groove is formed. It has a third color light emitting unit 40 configured in the mounting portion 12. In the multicolor LED light source device 100 according to the present embodiment, the color light emitting units 20 to 40 that emit blue light, red light, and green light are alternately arranged in a predetermined order without interfering with each other. The color unevenness of the apparatus 100 is small, the stimulus purity at the time of single-color light emission is high, and the color playability of synthetic white light can be enhanced. Further, since the control is simple as compared with the configuration in which the current value of each color is adjusted according to the temperature by using three types of LED chips that emit RGB colors, the cost of the device can be suppressed.

Further, in the multicolor LED light source device 100 according to the present embodiment, the second color light emitting unit 30 and the third color light emitting unit 40 having the phosphor-containing resin layers 31 and 41 are configured in the groove-shaped mounting portion 12. As a result, a step is formed between the first color light emitting unit 20, the second color light emitting unit 30, and the third color light emitting unit 40. As a result, as shown in FIG. 1, the light emitted by the first color light emitting unit 20 can be radiated to the outside without interfering with the second color light emitting unit 30 and the third color light emitting unit 40. As a result, in the multicolor LED light source device 100 according to the present embodiment, the distance L1 between the LED chip 1 of the first color light emitting unit 20 and the LED chip 1 of the second color light emitting unit 30 and the first color light emitting unit 20 Since the distance L1 between the LED chip 1 and the LED chip 1 of the third color light emitting unit 40 can be made shorter than before, the LED chips 1 can be arranged at high density, and the multicolor LED light source device 100 can be miniaturized. Can be converted to. As a result, the types of lighting devices that can be equipped with the multi-color LED light source device 100 increase, and the versatility of the multi-color LED light source device 100 can be enhanced.

Further, in the multicolor LED light source device 100 according to the present embodiment, only one type (single specification) LED chip 1 that emits light in the same wavelength range is used, and a phosphor is used for some LED chips 1. It is configured to emit multicolored light by performing color development. Here, a plurality of LED chips that emit light in different wavelength ranges, such as three different types of LED chips, such as a red LED chip that emits red light, a green LED chip that emits green light, and a blue LED chip that emits blue light. When different types of LED chips are used, LED chips in the long wavelength range such as red and amber have a relatively large decrease in illuminance due to temperature rise, and LED chips in the short wavelength range such as blue and green have a comparatively large decrease in illuminance due to temperature increase. Because the number of LEDs is small, the color of the light synthesized by mixing the three primary colors of red, green, and blue emitted from the three types of LED chips changes as the temperature rises after lighting, and is used for stage lighting, etc. In some cases, it was difficult to use it in scenes where the lights were turned on and off repeatedly. On the other hand, in the multicolor LED light source device 100 according to the present embodiment, by using only one type (single specification) LED chip 1 that emits light in the same wavelength range, a part of the LED chip 1 is used as the temperature rises after lighting. It is possible to effectively prevent the color of the light from changing, and it can be used appropriately even in scenes where the light is repeatedly turned on and off in stage lighting.

Further, since the blue LED chip, which is the LED chip 1, has a higher limit temperature than the red LED chip that emits red light and the green LED chip that emits green light (for example, the red LED chip has a limit temperature of about 115 ° C.). The green LED chip has a limit temperature of about 125 ° C., whereas the blue LED chip has a limit temperature of about 140 ° C.), and high output can be achieved. Further, the blue LED chip, which is the LED chip 1, has a large distribution volume in the market and is cheaper than the red LED chip and the green LED chip, so that the cost can be reduced.

Further, in the multicolor LED light source device 100 according to the present embodiment, the LED chip 1 that emits blue light is used to develop red and green light by a phosphor using the LED chip 1 that emits blue light. Compared with the case where a red LED chip that emits red light and a green LED chip that emits green light are combined to develop red and green light, the color playability can be further enhanced. In order to improve the color rendering property, it is important to make the spectrum emit light as broadly as possible.
FIG. 4A is a diagram showing an emission spectrum of a conventional multicolor LED light source device having an LED chip 1 that emits blue light, a red LED chip that emits red light, and a green LED chip that emits green light. 4 (B) is a diagram showing an emission spectrum of the multicolor LED light source device 100 according to the present embodiment. In FIG. 4A, the emission spectra of the red LED chip that emits red light and the green LED chip that emits green light have a relatively short wavelength range. On the other hand, in the present embodiment shown in FIG. 4B, when the blue LED chip is colored red or green with a phosphor, the wavelength range of red and green is widened, and the wavelength range of red and green is widened, and the whole is due to sunlight. It is possible to show a close emission spectrum. It was confirmed that the color rendering property did not exceed Ra90 at the color temperature of 3000K (see FIG. 9D), but the color rendering property exceeded Ra90 at the color temperatures of 5000K and 6500K.

Further, in the multicolor LED light source device 100 according to the present embodiment, the light emitting surface is a regular dodecagon so that the light emitting surface is substantially circular. In this way, by making the light emitting surface a regular dodecagon and making the light emitting surface close to a circle, it is possible to apply it to stage lighting that illuminates a person such as a spotlight. Further, by adjusting the concentration of the phosphor and the thickness of the transparent resin portion, the stimulating purity of the color (color depth) can be adjusted.

<< Second Embodiment >>
Next, the multicolor LED light source device 100a according to the second embodiment will be described. FIG. 5 is a plan view of the multicolor LED light source device 100a according to the second embodiment. The multicolor LED light source device 100a according to the second embodiment has a second LED chip 2 that emits blue light having a wavelength different from that of the LED chip 1 (hereinafter, also referred to as the first LED chip 1), and has a plurality of second LEDs. It has the same configuration as the multicolor LED light source device 100 according to the first embodiment, except that it has a fourth color light emitting unit 70 configured by arranging the two LED chips 2 on the plane mounting portion 11.

For example, in the present embodiment, the first LED chip 1 may be an LED chip having a peak wavelength of 450 nm, and the second LED chip 2 may be an LED chip having a peak wavelength of 470 nm (which emits blue-green light). can. The second LED chip 2 is not particularly limited as long as it is an LED chip that emits blue light having a wavelength different from that of the first LED chip 1, and a commercially available LED chip can be used. The second LED chip 2 having the same temperature characteristics and cost as the first LED chip 1 can be obtained on the market. In the following, it is assumed that the second LED chip 2 emits blue-green light.

In the multicolor LED light source device 100a according to the second embodiment, as shown in FIG. 5, the second color light emitting unit 30 that emits red light from the center line P toward the upper and lower ends, and the first that emits blue light. The color light emitting units 20, 30, 40, and 70 are formed alternately in the order of the color light emitting unit 20, the third color light emitting unit 40 that emits green light, and the fourth color light emitting unit 70 that emits blue green light. By alternately forming the first color light emitting unit 20, the second color light emitting unit 30, the third color light emitting unit 40, and the fourth color light emitting unit 70 in this way, the color of the light of the multicolor LED light source device 100a can be obtained. It can be mixed uniformly and color unevenness can be suppressed.

Here, FIG. 6A is a diagram showing an emission spectrum of the multicolor LED light source device 100 according to the first embodiment, and FIG. 6B is a diagram showing a multicolor LED light source device 100a according to the second embodiment. It is a figure which shows the emission spectrum of. In the multicolor LED light source device 100a according to the second embodiment, by adding the second LED chip 2 that emits blue-green light to the first LED chip 1 that emits blue light, as shown in FIG. 6B, In the emission spectrum of the multicolor LED light source device 100a, the wavelength region corresponding to blue to green can be widely covered, and the emission spectrum of sunlight can be made closer, so that the color playability can be further improved.

<< Third Embodiment >>
Next, the multicolor LED light source device 100b according to the third embodiment will be described. FIG. 7 is a plan view of the multicolor LED light source device 100b according to the third embodiment. The multicolor LED light source device 100b according to the third embodiment has the same configuration as the multicolor LED light source device 100a according to the second embodiment except that it has a fifth color light emitting unit 80 that emits yellow light.

In the third embodiment, the fifth color light emitting unit 80 has a plurality of LED chips on the flat bottom surface of the groove-shaped mounting portion 12 of the mounting substrate 10, similarly to the second color light emitting unit 30 and the third color light emitting unit 40. 1 is arranged in a row, and a phosphor-containing resin containing a phosphor that develops yellow light is filled and cured in a groove-shaped mounting portion 12 in which a plurality of LED chips 1 are arranged to form a phosphor-containing resin. It is composed by forming.

In the multicolor LED light source device 100b according to the third embodiment, as shown in FIG. 7, the first color light emitting unit 20 that emits blue light, the second color light emitting unit 30 that emits red light, and green light are emitted. The third color light emitting unit 40, the fourth color light emitting unit 70 that emits bluish green light, and the fifth color light emitting unit 80 that emits yellow light are repeatedly formed at regular intervals to some extent. As a result, the colors of the light of the multicolor LED light source device 100b can be uniformly mixed, and color unevenness can be suppressed.

As described above, the multicolor LED light source device 100b according to the third embodiment can emit five colors of light, and can reproduce almost the same number of colors as the conventional stage lighting using a halogen lamp. In addition, the color rendering property is further improved because the emission spectrum between green and red can be complemented. Here, FIG. 8A shows chromaticity coordinates of colors that can be covered by a conventional multicolor LED light source device that emits light of three colors of red, blue, and green shown in Patent Document 2 using a phosphor. 8 (B) is a diagram showing colors that can be covered by the multicolor LED light source device 100b according to the third embodiment in chromaticity coordinates.

As shown in FIG. 8A, in a conventional multicolor LED light source device in which three primary colors of red, green, and blue are emitted by using a phosphor, and the respective colors interfere with each other to reduce the stimulation purity of monochromatic light. While only 28 types of color coordinates could be covered in the chromaticity coordinates, as shown in FIG. 8B, the multicolor LED light source device 100b according to the third embodiment has three colors of red, green, and blue. By adding bluish green from the fourth color light emitting unit 70 and yellow light from the fifth color light emitting unit 80 to the primary color light, it has become possible to cover 34 types of color coordinates in chromaticity coordinates. .. This has a color reproduction rate almost the same as that of conventional stage lighting in which a halogen lamp is used and white light emitted from the halogen lamp is passed through a color filter to emit 35 colors. The fifth color light emitting unit 80 may be configured to emit yellowish green light or orange light instead of yellow light.

<< Fourth Embodiment >>
Next, the multicolor LED light source device 100c according to the fourth embodiment will be described. The multicolor LED light source device 100c according to the fourth embodiment has the same configuration as the multicolor LED light source device 100b according to the third embodiment except that it does not have the fourth color light emitting unit 70 that emits blue-green light. Have. In the multicolor LED light source device 100b, the first color light emitting unit 20 is provided at the place where the fourth color light emitting unit 70 is provided.

That is, in the multicolor LED light source device 100c according to the fourth embodiment, the first color light emitting unit 20 that emits blue light, the second color light emitting unit 30 that emits red light, and the third color light emitting unit that emits green light. The 40 and the fifth color light emitting unit 80 that emits yellow light are repeatedly formed at regular intervals, and emit light of four colors.

A comparative experiment of color rendering was carried out with a measurement distance of 600 mm using MK350NPLUS manufactured by UPRtek.
9 (A) to 9 (C) show color performance in a conventional multicolor LED light source device which has a red LED chip, a green LED chip, and a blue LED chip and emits light of three primary colors of red, green, and blue. 9 (D) is a diagram showing the measurement results of the color playability of the multicolor LED light source device 100 according to the first embodiment, and FIGS. 9 (E) to 9 (G) are views. It is a figure which shows the measurement result of the color playability of the multicolor LED light source apparatus 100c which concerns on 4th Embodiment. Specifically, FIG. 9A shows the color rendering index (CRI) at the color temperature (CCT) of 2972K of the conventional multicolor LED light source device, and the measurement result of the color rendering index is Ra35.5. .. Further, FIG. 9B shows the color rendering index (CRI) at the color temperature (CCT) of 5080K of the conventional multicolor LED light source device, and the measurement result of the color rendering index is Ra45.8. Further, FIG. 9C shows the color rendering index (CRI) of the conventional multicolor LED light source device at a color temperature (CCT) of 6510 K, and the color rendering index measurement result is Ra54.2. As described above, in the conventional multicolor LED having a red LED chip, a green LED chip and a blue LED chip and emitting only light of the three primary colors of red, green and blue, the color temperature at 3000 to 6500K is less than 50. , High color rendering was not obtained. FIG. 9D shows the color rendering property measurement result of the multicolor LED light source device 100 according to the first embodiment at 3000K, and the color rendering property measurement result was Ra77.2 (note that at 5000K and 6500K). The color rendering property is Ra90 or higher.).

On the other hand, FIG. 9E shows the color rendering property (CRI) at the color temperature (CCT) of 3020K of the multicolor LED light source device 100c according to the fourth embodiment, and the measurement result of the color rendering property is Ra90. It became. Further, FIG. 9F shows the color rendering property (CRI) at the color temperature (CCT) of 5013K of the multicolor LED light source device 100c, and the measurement result of the color rendering property is Ra90.3. Further, FIG. 9 (G) shows the color rendering index (CRI) of the multicolor LED light source device 100c at a color temperature (CCT) of 6510K, and the measurement result of the color rendering index is Ra90.4. As described above, in the multicolor LED light source device 100c according to the fourth embodiment, the color rendering property at 3000 to 6500K is Ra90 by developing red, green, and yellow colors by the phosphor and emitting light of four colors in total. From the above, it was found that high color rendering properties can be obtained.

Although the preferred embodiment of the present invention has been described above, the technical scope of the present invention is not limited to the description of the above embodiment. Various changes and improvements can be added to the above-described embodiments, and those in which such changes or improvements have been made are also included in the technical scope of the present invention.

For example, in the above-described embodiment, a multi-color light source device using an LED chip that irradiates light of 3 to 5 colors has been described as an example, but the present invention is not limited to this configuration, and light of 6 or more colors is irradiated. It can also be configured by an LED chip.

100, 100a, 100b, 100c ... Multicolor LED light source device 1 ... LED chip 10 ... Mounting board 11 ... Flat mounting part 12 ... Groove-shaped mounting part 20 ... First color light emitting unit 30 ... Second color light emitting unit 31 ... Fluorescent material-containing resin layer 40 ... Third color light emitting unit 41 ... Fluorescent material-containing resin layer 50 ... Dam material 60 ... Transparent resin layer 70 ... Fourth color light emitting unit 80 ... Fifth color light emitting unit

Claims (14)

A blue light emitting unit consisting of multiple LED chips and
A red light emitting unit consisting of multiple LED chips and
A green light emitting unit consisting of multiple LED chips and
A mounting substrate having a light emitting surface composed of a plurality of groove-shaped mounting portions arranged in parallel and a flat mounting portion provided between the plurality of groove-shaped mounting portions is provided.
The blue light emitting unit is provided on the flat surface mounting portion, and the blue light emitting unit is provided.
A multi-color LED light source device, wherein the red light emitting unit and the green light emitting unit are provided in the groove-shaped mounting portion. The multicolor LED light source device according to claim 1, wherein the red light emitting unit and the green light emitting unit are arranged alternately with the blue light emitting unit interposed therebetween. The blue light emitting unit includes five or more LED chips.
The multicolor LED light source device according to claim 2, further comprising four or more of the red light emitting unit and the green light emitting unit. The multicolor LED according to any one of claims 1 to 3, wherein the blue light emitting unit, the red light emitting unit, and the plurality of LED chips constituting the green light emitting unit are blue LED chips having the same specifications. Light source device. The blue light emitting unit is composed of a unit row unit composed of a plurality of blue LED chips having a first peak wavelength and a plurality of blue LED chips having a second peak wavelength different from the first peak wavelength. The multicolor LED light source device according to any one of claims 1 to 3, further comprising a unit row unit. A first color light emitting unit consisting of multiple LED chips and
A second color light emitting unit consisting of multiple LED chips and
A third color light emitting unit consisting of multiple LED chips and
A fourth color light emitting unit consisting of multiple LED chips and
A mounting substrate having a light emitting surface composed of a plurality of groove-shaped mounting portions arranged in parallel and a flat mounting portion provided between the plurality of groove-shaped mounting portions is provided.
The first color light emitting unit is provided on the flat surface mounting portion, and the first color light emitting unit is provided.
A multi-color LED light source device, wherein the second color light emitting unit, the third color light emitting unit, and the fourth color light emitting unit are sequentially provided in the groove-shaped mounting portion. The multicolor LED light source device according to claim 6, wherein the plurality of LED chips included in the first color light emitting unit are blue LED bare chips and emit blue light. The first color light emitting unit is composed of a unit row unit composed of a plurality of blue LED chips having a first peak wavelength and a plurality of blue LED chips having a second peak wavelength different from the first peak wavelength. The multicolor LED light source device according to claim 7, wherein the unit row unit is provided. The second color light emitting unit emits red light,
The third color light emitting unit emits green light,
The multicolor LED light source device according to claim 8, wherein the fourth color light emitting unit emits yellow light, yellowish green light, or orange light. The multicolor LED light source device according to claim 6, wherein the plurality of LED chips constituting each color light emitting unit are blue LED chips having the same specifications. The multicolor LED light source device according to any one of claims 1 to 10, wherein the color units are arranged so that the light emitted by the color light emitting units does not interfere with each other. The multicolor LED according to any one of claims 1 to 11, wherein the groove-shaped mounting portion has a depth of 0.5 to 1.5 mm and a width of 1.0 to 2.5 mm. Light source device. The multicolor LED light source device according to any one of claims 1 to 12, wherein the light emitting surface is a regular polygon having a hexagon or more. The multicolor LED light source device according to any one of claims 1 to 13, wherein the color rendering property at a color temperature of 5000 to 6500K exceeds Ra90.

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