Light-emitting module and lighting device

Abstract

The light-emitting module includes LEDs (light sources) of 7 colors (2700K, 5700K, purple, blue, blue-green, yellow-green, and red). In the light-emitting module, by making the 7-color LEDs emit light at predetermined intensities (luminous fluxes), the average color rendering index Ra and the special color rendering index R9 can be 98 or more, and the special color rendering index R12 can be 94 or more at a correlated color temperature of 5000 to 6500K, which is equivalent to the color temperature of sunlight during the day, and a synthetic light with high color rendering can be emitted.

Description

Technical Field

[0001] The invention relates to a light emitting module and a lighting device. Background Art

[0002] A light emitting module is proposed that mixes first light and second light to output light having an average color rendering index Ra of 90 or more and a special color rendering index R9 of 90 or more within a color temperature range of 2000K to 3200K (for example, Patent Document 1).

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-119723 Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] In the light-emitting module described in Patent Document 1, a high color rendering index is obtained only at a relatively low correlated color temperature of 2000K to 3200K and only within a relatively small correlated color temperature range. However, there is no disclosure for a relatively high correlated color temperature of 3500K or higher. Therefore, a light-emitting module is desired that can output light with high color rendering index at a relatively high correlated color temperature or within a larger correlated color temperature range.

[0008] The present invention has been made in view of the above-mentioned actual situation, and an object of the present invention is to provide a light emitting module and a lighting device that emit light with higher color rendering.

[0009] [Technical solutions for solving technical problems]

[0010] In order to achieve the above-mentioned object, the light emitting module of the present invention comprises:

[0011] a first light source that emits light having a first correlated color temperature,

[0012] a second light source that emits light having a second correlated color temperature higher than the first correlated color temperature, and

[0013] 5 kinds of colored light sources, each of which can emit light of different luminous colors;

[0014] By making the first light source, the second light source, and the five colored light sources emit light with luminous intensities in predetermined proportions, it is possible to emit mixed light with a correlated color temperature of above 5000K and below 6500K, an average color rendering index Ra of above 98, a special color rendering index R9 of above 98, and a special color rendering index R12 of above 94.

[0015] Alternatively, the first correlated color temperature may be 2700K.

[0016] Alternatively, the second correlated color temperature may be 5700K.

[0017] For example, the first light source may include a bulb color light source, the second light source may be a white light source, and the five colored light sources may include a purple light source, a blue light source, a cyan light source, a yellow-green light source, and a red light source.

[0018] Alternatively, by making the first light source, the second light source, and the five colored light sources emit light with luminous intensities in predetermined proportions, mixed light with a correlated color temperature of more than 5000K and less than 6500K, and an average color rendering index Ra and a special color rendering index R9 of 99 can be emitted.

[0019] Alternatively, mixed light having a correlated color temperature of greater than 5000K and less than 6500K may be emitted by causing the first light source, the second light source, and the yellow-green light source to emit light with a luminous intensity sufficiently higher than the total luminous intensity of the light sources among the five colored light sources except the yellow-green light source.

[0020] For example, the correlated color temperature of the light emitted by the first light source may be 2700K, the correlated color temperature of the light emitted by the second light source may be 5700K, and the five colored light sources may include a third light source emitting purple light, a fourth light source emitting blue light, a fifth light source emitting blue-green light, a sixth light source emitting yellow-green light, and a seventh light source emitting red light.

[0021] In this case, the first to seventh light sources may be

[0022] emit light at a ratio of luminous flux of 24000:0:0:0:0:0:0, thereby synthesizing light with a correlated color temperature of 2700K, or

[0023] emit light at a ratio of luminous flux of 22000:0:4.6:220:110:2750:0, thereby synthesizing light of a correlated color temperature of 3000K, or,

[0024] emit light at a ratio of luminous flux of 20000:4600:10.9:330:530:4000:0, thereby synthesizing light of a correlated color temperature of 3500K, or,

[0025] emit light at a ratio of luminous flux of 19000:11400:19.3:530:760:5300:0, thereby synthesizing light of a correlated color temperature of 4000K, or,

[0026] emit light at a ratio of luminous flux of 14800:14700:88:1050:1740:9590:87, thereby synthesizing light of a correlated color temperature of 5000K, or,

[0027] emit light at a ratio of luminous flux of 11000:16900:92:1350:1930:11000:230, thereby synthesizing light of a correlated color temperature of 5500K, or,

[0028] emit light at a luminous flux ratio of 6000:18000:100.6:1500:1300:8000:0, thereby synthesizing light with a correlated color temperature of 6500K, or,

[0029] emit light at a luminous flux ratio of 3100:15000:111.5:1500:1000:6600:0, thereby synthesizing light with a correlated color temperature of 8000K, or,

[0030] emit light at a luminous flux ratio of 2200:15000:159.2:1500:1800:6600:0, thereby synthesizing light with a correlated color temperature of 10000K, or,

[0031] The light is emitted at a luminous flux ratio of 0:15000:226.3:1500:2200:5200:0, thereby synthesizing light with a correlated color temperature of 20000K.

[0032] Alternatively, the device further includes a dimming control component capable of dimming the first light source, the second light source, and the five colored light sources at predetermined resolutions;

[0033] The dimming control component performs dimming by combining FM (Frequency Modulation) dimming, PWM (Pulse Width Modulation) dimming, and DC (Direct Current) dimming.

[0034] The plurality of first light sources and the plurality of second light sources may be arranged radially in a direction from the vicinity of the center of the circular substrate toward the circumference.

[0035] In addition, it may also be such that: the lighting device of the present invention

[0036] A lighting device having the light-emitting module;

[0037] Also included is a control device that controls a dimming control component that dims the first light source, the second light source, and the five colored light sources;

[0038] The control device includes a storage unit, which pre-stores a table representing the relationship between the luminous intensity of the first light source, the second light source, and the five colored light sources and the correlated color temperature. The control device determines the luminous intensity of the first light source, the second light source, and the five colored light sources corresponding to the desired correlated color temperature with reference to the table stored in the storage unit, and controls the dimming control component based on the determined luminous intensity.

[0039] Alternatively, the lighting device may include:

[0040] a reflecting portion having a reflecting surface perpendicular to the arrangement surface of the first light source, the second light source, and the five colored light sources of the light emitting module, for reflecting the light emitted by the light emitting module; and a diffusing plate disposed on the opposite side of the light emitting module of the reflecting portion, for diffusing the light reflected by the reflecting portion.

[0041] Alternatively, the lighting device may include:

[0042] A lens extending approximately parallel to the arrangement plane of the first light source, the second light source, and the five colored light sources of the light emitting module, so as to converge or diverge the light radiated by the light emitting module; and a lens diffusion plate extending approximately parallel to the lens, so as to diffuse and shape the light passing through the lens.

[0043] Effects of the Invention

[0044] According to the present invention, light with high color rendering properties can be emitted. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a plan view showing a configuration example of the light emitting module in Embodiment 1.

[0046] Figure 2 This is a diagram showing an example of an LED (light source) constituting a light emitting module.

[0047] Figure 3 This is a block diagram showing an example of the configuration of a light emitting module.

[0048] Figure 4 This is a diagram showing the relationship between the output current of the LED driver and the gray scale of the LED.

[0049] Figure 5 This is a diagram showing the duty ratio, etc. in PWM dimming.

[0050] Figure 6 This is a diagram showing the color rendering properties of the light-emitting module.

[0051] Figure 7This is a diagram showing the spectral waveform of light from the light emitting module.

[0052] Figure 8 This is a diagram showing the configuration of a spotlight lighting device to which the light emitting module according to the first embodiment is applied.

[0053] Fig. 9 It is a diagram showing another example of the LED (light source) constituting the light emitting module.

[0054] Fig.10 This is a diagram showing the configuration of a spotlight lighting device to which the light emitting module according to the second embodiment is applied. DETAILED DESCRIPTION

[0055] (Implementation Method 1)

[0056] Hereinafter, a light emitting module according to Embodiment 1 of the present invention will be described with reference to the drawings.

[0057] (Light emitting module)

[0058] Figure 1 FIG. 1 is a top view showing a configuration example of the light emitting module 1 according to the present embodiment. Figure 1 As shown, the light emitting module 1 is composed of a substrate 10 and a plurality of LEDs (Light Emitting Diodes) 21 to 27 .

[0059] The substrate 10 is, for example, an LED substrate for installing a chip-type LED by soldering or the like. The substrate 10 is formed by covering the surface of a metal plate such as copper with an insulating material, and a wiring pattern is formed on the covering layer. The substrate 10 is provided with input and output terminals for electrically connecting the installed LED to a power source and an LED driver.

[0060] The substrate 10 of this embodiment is as follows Figure 1 As shown in FIG. 1 , the device is formed into a circle and has three areas 10A, 10B, and 10C divided into three parts. Figure 1 , only the LEDs 21 to 27 are provided in the region 10A, but the LEDs 21 to 27 are arranged in the same configuration in the regions 10B and 10C. That is, in the light emitting module 1, all the LEDs 21 to 27 provided in the regions 10A, 10B, and 10C of the substrate 10 generate synthetic light, thereby being able to emit light.

[0061] in addition, Figure 1The structure of the light emitting module 1 and the substrate 10 shown (the presence or absence of a region or wiring pattern, the position of the LED) is only an example. The structure of this embodiment is not limited to the structure of this embodiment, as long as the desired type and number of light emitting elements such as LEDs can be arranged so that it can function as a light source that emits light of a desired color and brightness (luminous flux). In addition, the substrate 10 may be provided with other structures such as a heat dissipation mechanism for heat dissipation.

[0062] LEDs 21 to 27 include: a plurality of first color LEDs 21, which serve as a first light source for emitting light having a first correlated color temperature (e.g., light of a light bulb color); a plurality of second color LEDs 22, which serve as a second light source for emitting light having a second correlated color temperature higher than the first correlated color temperature (e.g., light of a daylight color); a plurality of third color LEDs 23; a plurality of fourth color LEDs 24; a plurality of fifth color LEDs 25; a plurality of sixth color LEDs 26; and a plurality of seventh color LEDs 27.

[0063] The third color LED 23 , the fourth color LED 24 , the fifth color LED 25 , the sixth color LED 26 , and the seventh color LED 27 are color LEDs that can emit light of different colors, respectively, and function as five color light sources.

[0064] In the following description, the first color LED 21 , the second color LED 22 , the third color LED 23 , the fourth color LED 24 , the fifth color LED 25 , the sixth color LED 26 , and the seventh color LED 27 are also referred to as LED 21 , LED 22 , LED 23 , LED 24 , LED 25 , LED 26 , and LED 27 .

[0065] exist Figure 1 , an example is shown in which six LEDs 21 to 27 are provided in each area 10A, but the number of LEDs 21 to 27 can be any number as long as they can emit light of the desired luminous flux (brightness) as their respective light sources. The necessary number of each LED is determined based on the brightness required as the light source of each LED and the brightness (maximum brightness) of each LED. For example, in the light emitting module 1 of this embodiment, Figure 6 As described later in the figure, the 2700K LED 21 is made to emit light at a maximum of 24000 lumens (Lm). Therefore, when the luminous flux of each LED 21 is set to 400 lumens, at least 60 LEDs 21 (= 24000 / 400) are provided on the entire substrate 10. In addition, in order to make the blue-green LED 25 emit light at a maximum of 2200 lumens (Lm), when the luminous flux of each LED 25 is 100 lumens, at least 22 LEDs 25 (= 2200 / 100) are provided on the entire substrate 10.

[0066] Figure 2 This is a diagram showing an example of LEDs 21 to 27 .

[0067] like Figure 2 As shown, the LED 21 of this embodiment is composed of a bulb color LED. More specifically, the LED 21 is composed of, for example, an LED that can emit light of a bulb color having a correlated color temperature of 2700K (Kelvin) and a chromaticity coordinate (central value) of (0.4578, 0.4101) in the chromaticity diagram (CIE1931) specified by CIE (International Commission on Illumination).

[0068] LED 22 is composed of a white LED. More specifically, LED 22 can emit light having a correlated color temperature of 5700K (Kelvin) and a chromaticity coordinate (central value) of (0.3287, 0.3417) in CIE1931, for example.

[0069] In addition, the so-called correlated color temperature refers to the temperature expressed in the color (temperature) of black body radiation that looks the closest to the color of the light source. The unit of correlated color temperature is Kelvin (K). The correlated color temperature is a scale that expresses the light color of the light source (bluish, reddish, etc.), and is a value displayed in the color (temperature) of black body radiation that looks the closest to the color of the light source.

[0070] Furthermore, LED 23 can emit violet (VLT) light having a peak wavelength λp in the range of 420 nm to 430 nm.

[0071] The LED 24 can emit blue (BLU) light having a main wavelength λd in the range of 475 nm to 480 nm.

[0072] The LED 25 can emit blue-green (CYN) light having a main wavelength λd in the range of 496 nm to 500 nm.

[0073] LED 26 can emit yellow-green (LME) light having a chromaticity coordinate (central value) of (0.4140, 0.5430) in CIE1931, for example.

[0074] The LED 27 can emit red (RED) light having a main wavelength λd in the range of 624 nm to 634 nm.

[0075] in addition, Figure 2 The characteristics of the LED shown are only examples and are not limited thereto. LEDs having substantially the same characteristics or within a tolerance range may also be used. For example, when the LEDs are the same color, LEDs having different peak wavelengths and main wavelengths may be used. Specifically, when the central values ​​of the peak wavelength and the main wavelength are the same, the width of the frequency band of the emitted light may also be different.

[0076] In addition, since there are individual differences in LED products, the numerical values ​​of LED characteristics, etc. may not be completely consistent, as long as they are within the same range understood in the field. For example, the so-called correlated color temperature of 2700K includes a temperature within a predetermined error range (e.g., 2%) such as 2646K to 2754K. The same applies to the numerical values ​​in the following embodiment.

[0077] Figure 3 1 is a block diagram showing an example of the structure of the light emitting module 1. Figure 3 As shown, a plurality of LEDs 21 are connected in series to each other and are connected to an LED driver 30. The LED driver 30 is composed of a circuit for lighting the LEDs 21 with a predetermined luminous flux (brightness), and allows current to flow to the plurality of LEDs 21 connected in series. Figure 3 , an example is shown in which the LED driver 30 is connected to the LED 21, but the LED driver 30 is provided for each of the LEDs 21 to 27 of each color. The LED driver 30 is connected to a control device 40 that controls the respective output currents. The LED driver 30 can light up the LEDs 21 to 27 of each color at a desired luminous flux according to a predetermined resolution (e.g., 8192 steps) based on the control of the control device 40. That is, the LED driver 30 can dim the LEDs 21 to 27 of each color to a desired brightness according to the predetermined resolution.

[0078] The LED driver 30 of this embodiment dims the LED by combining PWM dimming that performs dimming by PWM (Pulse Width Modulation) control and DC (Direct Current) dimming that performs dimming by increasing or decreasing current.

[0079] Figure 4 3 is a diagram showing the relationship between the output current of an LED driver 30 and the grayscale of an LED. Figure 4 As shown, the LED driver 30 keeps the output current constant at low brightness 0 to 1023 grayscales (1024 levels), and dims the LED through PWM dimming, which changes the frequency and duty cycle of the output pulse wave. In addition, the LED driver 30 dims the LED through DC dimming that increases and decreases the level of the output current at 1024 to 8191 grayscales. In this way, the LED driver 30 of this embodiment can dim the LED with a total resolution of 8192 stages (13 bits) through a combination of PWM dimming and DC dimming.

[0080] Thus, the LED driver 30 of this embodiment can realize fine dimming by adopting PWM dimming at low brightness grayscale lower than the reference, and can prevent flicker caused by lighting and extinguishing by adopting DC dimming at high brightness grayscale higher than a predetermined level.

[0081] in addition, Figure 4 The maximum value of the current level and the value of the constant current during PWM are determined according to the characteristics of the LED to be controlled.

[0082] Figure 5 This is a diagram showing the duty cycle of PWM dimming at low brightness. The resolution of PWM dimming is 1024 steps (10 bits). Figure 5 As shown, the dimming cycle of one dimming signal output by the control device 40 is 2000μs. In one cycle of 2000μs, 8 PWM pulse waves are generated. The duty cycle of each pulse ranges from 0 / 128 to 128 / 128. In addition, the minimum pulse width of the pulse wave (duty cycle 1 / 128) is approximately 1.95μs (=2000μs / 8 / 128). That is, the pulse width of each pulse varies in the range of 1.95 to 250μs.

[0083] The duty cycle of each pulse in each gray scale and the total value of the pulse width are as follows: Figure 5 The larger the total value of the pulse width, the higher the brightness of the LED will be.

[0084] In addition, in grayscale 0 to 7, the pulse wave is intermittently removed by setting a period of duty cycle 0. As a result, the number of pulses output between 1 cycle of 2000μs changes to 0 to 8, so as a result, the frequency of the PWM pulse wave changes to 0Hz to 4KHz. In other words, it can also be said that in grayscale 0 to 8, it is FM (Frequency Modulation) dimming based on frequency modulation.

[0085] As described above, the LED driver 30 of this embodiment can dim the LEDs in a favorable manner by combining FM dimming, PWM dimming, and DC dimming.

[0086] In addition, for example, the dimming signal of the LED driver 30 is composed of 13 bits, and the control device 40 can light the LED to be controlled at a predetermined brightness by inputting a dimming signal having a value corresponding to the dimming operation to the LED driver 30 .

[0087] The number of LEDs connected to the LED driver 30 can be arbitrary and is not limited to the number connected in series. It can also be the number of series and parallel combinations. In addition, the LED driver 30 is not limited to the LED driver of this embodiment. As long as it can light up each color LED 21 to 27 at a predetermined resolution, it can light up the LED only by PWM dimming or DC dimming, or other control methods can be used. In addition, the resolution of the LED driver 30 is not limited to 8192 (13 bits), and the grayscale of switching from PWM dimming to DC dimming can also be changed arbitrarily. In addition, Figure 5 The duty ratio shown can also be changed, for example, the total pulse width can correspond to the grayscale value.

[0088] (Color rendering)

[0089] Figure 6 The diagram shows measurement results of the luminous flux (brightness) of each LED, the total luminous flux, and the color rendering index (Ra, R9, R12, TLCI) when the light emitting module 1 emits light at a correlated color temperature of 2000K to 20000K.

[0090] Ra (average of Rendering index) is the average color rendering index specified by CIE, which indicates the index obtained by averaging the color rendering indices evaluated using 8-color (R1-R8) color cards. R9 and R12 are special color rendering indices specified by CIE, which indicate the color rendering indices of color cards using test colors of R9 and R12, respectively. TLCI (Television Lighting Consistency Index) is an evaluation standard for studio lighting and lighting equipment specified by the European Broadcasting Union. These indices are indicators of color rendering and can be measured by dedicated measuring instruments, etc. The value range of each indicator is 0 to 100, with 100 indicating the highest color rendering.

[0091] in addition, Figure 6 It adopts Figure 2 The LEDs shown are LEDs 21 to 27. The luminous flux of each LED is adjusted to a value that conforms to the waveform (D50, D55, D65, etc.) of the CIE standard light source with Ra of 100. In addition, purple (VLT) LEDs contribute to hue and color rendering, but due to the human visibility characteristics, they do not contribute to (Lm). Therefore, in Figure 6 In FIG. 1 , the values ​​of (W) and (Lm) are shown together for purple. In this example, the relationship of Lm=coefficient K×W (coefficient K=8.38) is established.

[0092] Specifically, from Figure 6 Understand the following content.

[0093] i) By making LEDs 21 to 27 emit light at 24000 (Lm), 0 (Lm), 0 (Lm), 0 (Lm), 0 (Lm), 0 (Lm), 0 (Lm), respectively, a synthetic light having a correlated color temperature of 2700K and a total luminous flux of 24000 (Lm) is obtained. At this time, the power consumption is 292.1 (W) and the luminous efficiency is 82.2 (Lm / W). At this time, Ra is 96, R9 is 97, R12 is 95, and TLCI is 95, and a higher color rendering index is obtained.

[0094] ii) By making LEDs 21 to 27 emit light at 22000 (Lm), 0 (Lm), 4.6 (Lm), 220 (Lm), 110 (Lm), 2750 (Lm), and 0 (Lm), respectively, a synthetic light with a total luminous flux of 25085 (Lm) at a correlated color temperature of 3000K is obtained. At this time, the power consumption is 292.7 (W) and the luminous efficiency is 85.7 (Lm / W). At this time, Ra is 97, R9 is 99, R12 is 95, and TLCI is 99, and a high color rendering index is obtained.

[0095] iii) By making LEDs 21 to 27 emit light at 20000 (Lm), 4600 (Lm), 10.9 (Lm), 330 (Lm), 530 (Lm), 4000 (Lm), and 0 (Lm), respectively, a synthetic light with a correlated color temperature of 3500K and a total luminous flux of 29471 (Lm) is obtained. The power consumption at this time is 331.8 (W) and the luminous efficiency is 88.8 (Lm / W). At this time, Ra is 98, R9 is 96, R12 is 97, and TLCI is 99, and a higher color rendering index is obtained.

[0096] iv) By making LEDs 21 to 27 emit light at 19000 (Lm), 11400 (Lm), 19.3 (Lm), 530 (Lm), 760 (Lm), 5300 (Lm), and 0 (Lm), respectively, a synthetic light with a correlated color temperature of 4000K and a total luminous flux of 37009 (Lm) is obtained. At this time, the power consumption is 405.5 (W) and the luminous efficiency is 91.3 (Lm / W). At this time, Ra is 98, R9 is 97, R12 is 94, and TLCI is 99, and a high color rendering index is obtained.

[0097] v) By making LEDs 21 to 27 emit light at 14800 (Lm), 14700 (Lm), 88.0 (Lm), 1050 (Lm), 1740 (Lm), 9590 (Lm), and 87 (Lm), respectively, a synthetic light having a correlated color temperature of 5000K and a total luminous flux of 42055 (Lm) is obtained. At this time, the power consumption is 459.6 (W), the luminous efficiency is 91.5 (Lm / W), Ra and R9 are 99, R12 is 98, and TLCI is 99, which can obtain a higher color rendering.

[0098] vi) By making LEDs 21 to 27 emit light at 11000 (Lm), 16900 (Lm), 92.0 (Lm), 1350 (Lm), 1930 (Lm), 11000 (Lm), and 230 (Lm), respectively, a synthetic light having a correlated color temperature of 5500K and a total luminous flux of 42502 (Lm) is obtained. The power consumption at this time is 458.9 (W) and the luminous efficiency is 92.6 (Lm / W). At this time, Ra and R9 are 99, R12 is 94, and TLCI is 99, and a high color rendering index is obtained.

[0099] Vii) By making LEDs 21 to 27 emit light at 6000 (Lm), 18000 (Lm), 100.6 (Lm), 1500 (Lm), 1300 (Lm), 8000 (Lm), and 0 (Lm), a synthetic light having a correlated color temperature of 6500K and a total luminous flux of 34901 (Lm) is obtained. The power consumption at this time is 385.5 (W) and the luminous efficiency is 90.5 (Lm / W). At this time, Ra and R9 are 99, R12 is 95, and TLCI is 100, and a high color rendering index is obtained.

[0100] Viii) By making LEDs 21 to 27 emit light at 3100 (Lm), 15000 (Lm), 111.5 (Lm), 1500 (Lm), 1000 (Lm), 6600 (Lm), and 0 (Lm), a synthetic light having a correlated color temperature of 8000K and a total luminous flux of 27311 (Lm) is obtained. The power consumption at this time is 311.0 (W) and the luminous efficiency is 87.8 (Lm / W). At this time, Ra and R9 are 98, R12 is 93, and TLCI is 99, and a high color rendering index is obtained.

[0101] ix) By making LEDs 21 to 27 emit light at 2200 (Lm), 15000 (Lm), 159.2 (Lm), 1500 (Lm), 1800 (Lm), 6600 (Lm), and 0 (Lm), a synthetic light having a correlated color temperature of 10000K and a total luminous flux of 27259 (Lm) is obtained. The power consumption at this time is 323.4 (W) and the luminous efficiency is 84.3 (Lm / W). At this time, Ra is 98, R9 is 99, R12 is 85, and TLCI is 100, and a high color rendering index is obtained.

[0102] x) By making LEDs 21 to 27 emit light at 0 (Lm), 15000 (Lm), 226.3 (Lm), 1500 (Lm), 2200 (Lm), 5200 (Lm), and 0 (Lm), a synthetic light having a correlated color temperature of 20000K and a total luminous flux of 24126 (Lm) is obtained. The power consumption at this time is 310.6 (W) and the luminous efficiency is 77.7 (Lm / W). At this time, Ra is 97, R9 is 98, R12 is 78, and TLCI is 99, and sufficient color rendering is obtained.

[0103] Thus, in the light emitting module 1 of this embodiment, since the LEDs 21 to 27 are arranged Figure 6 The light is emitted with the intensity (luminous flux) shown, thereby achieving: Ra and R9 of 98 or above (99), R12 of 94 or above, and TLCI of 99 or above (synthetic light can be emitted) at a correlated color temperature of 5000 to 6500K, which is equivalent to the color temperature of daytime sunlight.

[0104] exist Figure 6 In the example shown, the ratio of the luminous intensity when the correlated color temperature is 5000-6500K, Ra and R9 are 98 or above (99), and R12 is 94 or above is achieved, and the luminous intensity of each of the 2700K LED21, the 5600K LED22, and the yellow-green LED is sufficiently high compared to the total luminous intensity of the other four types of colored light sources.

[0105] Furthermore, in the light-emitting module 1, high color rendering properties can be achieved such as Ra of 98 or more at a correlated color temperature of 3500K to 10000K (96 or more at a correlated color temperature of 2700K to 20000K, and 90 or more at a correlated color temperature of 2500K to 20000K), R9 of 97 or more at a correlated color temperature of 2700K to 20000K, R12 of 95 or more at a correlated color temperature of 2700K to 6500K (93 or more at a correlated color temperature of 2500K to 8000K), and TLCI of 99 or more at a correlated color temperature of 3000K to 20000K (95 or more at a correlated color temperature of 2700K to 20000K, and 91 or more at a correlated color temperature of 2500K to 20000K).

[0106] In addition, it is possible to achieve extremely high color rendering of 93 or more for all Ra, R9, and R12 in a wide range of correlated color temperatures of 2700K to 8000K. Furthermore, if limited to Ra and R9, it is possible to achieve 97 or more in a wide range of correlated color temperatures of 3000K to 20000K.

[0107] If the luminous flux of LED 21 to 27 is maintained at Figure 6 The ratio shown in the figure can ensure that the same color rendering can be achieved even if the total luminous flux (brightness) changes. Figure 6 The luminous flux of each LED is adjusted up and down in proportion to the luminous flux shown, thereby ensuring the same color rendering and varying the brightness.

[0108] In this way, the light emitting module 1 of this embodiment drives each LED driver 30 connected to the 7-color LEDs 21 to 27 based on the control of the control device 40, so that the 7-color LEDs are lit with a predetermined ratio of intensity (luminous flux, brightness). As a result, the light emitting module 1 can emit high color rendering synthetic light. Such a light emitting module 1 can be well applied to a lighting device requiring color rendering.

[0109] from Figure 6 The ratio (brightness ratio) of the luminous flux of the emitted light of each LED 21 to 27 in each correlated color temperature obtained is not strict. There is no problem with a deviation of about ±10%. The same applies to the interpretation of the claims. For ease of control, the ratio can also be made easier to understand. For example, the ratio of the luminous flux when the correlated color temperature is 5000K can be simplified (adjusted) as 15000:15000:90:1050:1750:9600:90=1500:1500:9:105:175:960:9. Similarly, for example, the ratio of the luminous flux when the correlated color temperature is 6500K can be simplified as 6000:18000:100:1500:1300:8000:0=60:180:1:15:13:80:0. Furthermore, the LED set to “off” may also be lit at a level that is not emphasized.

[0110] Figure 7 It shows the spectrum waveform when the light-emitting module 1 emits light at a correlated color temperature of 5500K. Figure 7 As shown, according to the light emitting module 1, a spectrum waveform close to the waveform D55 of the CIE standard light source can be obtained at a correlated color temperature of 5500K equivalent to sunlight. Similarly, according to the light emitting module 1, spectrum waveforms close to the waveforms D50, D65, D75, etc. can be obtained at correlated color temperatures of 5000K, 6500K, and 7500K. In addition, here, the correlated color temperature also allows an error of about 6%.

[0111] In addition, since 2000K and 2500K are both poor in lighting efficiency and color rendering, it is preferable that the light emitting module 1 is used in a range of 2700K to 20000K.

[0112] (lighting device)

[0113] Next, as an application example of the light emitting module 1 of the present embodiment, a spotlight lighting device 100 to which the light emitting module 1 is applied will be described. Figure 8 1 is a block diagram of a spotlight lighting device 100 of the present embodiment. The spotlight lighting device 100 is composed of the above-mentioned light emitting module 1, a heat sink (heat sink) 101, a housing 102, and a lens 103. In addition, the spotlight lighting device 100 includes: a control device 40 for controlling the correlated color temperature and brightness of the irradiated light; and a power source (not shown).

[0114] The heat dissipation unit (heat sink) 101 dissipates heat generated in the light emitting module 1 to the outside. The light emitting module 1 is provided at one end of the heat dissipation unit 101. The heat dissipation unit 101 is composed of, for example, a plurality of heat dissipation plates made of copper or the like, heat pipes connected to the plurality of heat dissipation plates, and the like.

[0115] The housing 102 is a box-shaped member provided to cover the heat dissipation unit 101 and the light emitting module 1 and supported by legs. An opening is provided at the end of the housing 102 on the light emitting module 1 side. The housing 102 is made of, for example, aluminum alloy.

[0116] The lens 103 is provided at the opening of the housing 102 to converge or diverge the light emitted from the light emitting module 1. The lens 103 may be, for example, a Fresnel lens having a sawtooth-shaped cross section.

[0117] In addition, the spotlight lighting device 100 may include a position adjustment mechanism for adjusting the position of the light emitting module 1 relative to the lens 103 and a color filter for changing the color of the irradiated light.

[0118] The control device 40 includes, for example, a storage unit 40a and a processor 40b. The storage unit 40a stores in advance a table that associates the correlated color temperature with the ratio of the intensity of the seven colors of the LEDs 21 to 27. Figure 6 The storage unit 40a stores a table showing the ratio of the luminous flux of LEDs 21 to 27 to the total luminous flux corresponding to the correlated color temperatures of 2700K, 3000K, 3500K, 4000K, 5000K, 5500K, 6500K, 8000K, 10000K, and 20000K. For each LED 21 to LED 27, the storage unit 40a stores a table showing the correspondence between the luminous flux and the driving method required to obtain the luminous flux. Specifically, for a small luminous flux, the storage unit 40a stores the table showing the ratio of the luminous flux of LEDs 21 to 27 to the total luminous flux. Figure 5 The "gray scale" shown is replaced by a luminous flux (Lm) table. For large luminous flux (luminous flux that needs to be driven with a duty cycle of 1 or more), a table is stored that corresponds the luminous flux to the current value of the DC current flowing through the series circuit of the LED.

[0119] The processor 40b executes control operations according to the program stored in the internal memory. When the operator operates the control knob or inputs the desired correlated color temperature and brightness (total luminous flux) of light from an external device, the processor 40b takes in this information. The processor 40b reads the ratio of the luminous flux of the LEDs 21 to 27 to the input correlated color temperature from the storage unit 40a, and multiplies the value corresponding to the brightness by the read ratio to obtain the brightness (luminous flux) of each LED 21 to 27.

[0120] The processor 40b determines a driving method for obtaining the required brightness of each LED 21 to 27. Based on the determined driving method, the processor 40b outputs a dimming signal to the LED driver 30, and the dimming signal is used to perform FM dimming, PWM dimming, DC dimming, etc. The LED driver 30 drives the LEDs 21 to 27 based on the dimming signal to emit light. In this way, the lighting device 100 radiates synthetic light of the desired correlated color temperature and brightness.

[0121] The control device 40 is not limited to a configuration using a processor, and the control device 40 may be configured by a dedicated chip using ASIC (application specific integrated circuit) technology.

[0122] According to the spotlight lighting device 100 of this embodiment, as described above, the light emitting module 1 with high color rendering is used as a light source, so that light close to natural light can be emitted and can be suitably used in a performance space such as a stage or a studio.

[0123] The spotlight lighting device 100 can be fixed to a ceiling or a wall, or can be set on a support. In addition, here, as a lighting device, an example of applying the light emitting module 1 to the spotlight lighting device 100 is described, but the lighting device is not limited to a spotlight, and can be a lighting device (such as a light bulb, etc.) including the light emitting module 1.

[0124] In the first embodiment, the light source is formed by LED, but it may be formed by other light emitting elements such as laser diode or organic EL (Electro-Luminescence). In addition, the light emitting element may be any one of a shell-shaped, surface-mounted, or chip-shaped light emitting element.

[0125] Furthermore, LEDs or light sources other than the LEDs 21 to 27 may be arranged on the substrate 10 depending on the application.

[0126] In addition, Figure 1 In the example, the shape of the light-emitting element (LED 21 to 27) is a square, but the shape of the light-emitting element may be a rectangle. In addition, the size of the light-emitting elements is the same (the same plane dimensions), but the size of the light-emitting elements may be different. In this case, it is also possible to provide light-emitting elements of different sizes and shapes among the plurality of light-emitting elements.

[0127] In addition, Figure 1 In the example, a case where a plurality of light emitting elements (LEDs 21 to 27) are arranged on a circular substrate 10 is illustrated, but the shape of the substrate or the shape of the region where the plurality of light emitting elements are arranged can be appropriately changed. For example, it is also possible to arrange a plurality of light emitting elements on a quadrilateral substrate or region. In addition, the arrangement of the light emitting elements is not limited to Figure 1 For example, a plurality of light emitting elements may be arranged in a grid, a row, a radial pattern, or the like, or may be arranged randomly.

[0128] Fig. 9 It is a diagram showing another example of the arrangement structure of the light emitting elements (LEDs 21 to 27). Fig. 9 The light emitting module 1 shown is Figure 1 The light emitting module 1 shown in the figure has a different arrangement of light emitting elements on the substrate 10. The substrate 10 is made of Figure 1 The example shown is composed of the same circular structure and is divided into three parts, namely, three areas 10A, 10B, and 10C. Fig. 9 , an example is shown in which LEDs 21 to 27 are provided only in region 10A, but LEDs 21 to 27 are arranged in the same configuration in regions 10A, 10B, and 10C. That is, in the light emitting module 1, all LEDs 21 to 27 provided in regions 10A, 10B, and 10C of the substrate 10 can generate synthetic light and emit light.

[0129] exist Fig. 9 In the example of , a plurality of first color LEDs 21 and a plurality of second color LEDs 22 are respectively arranged radially in a direction from the vicinity of the center of the circular substrate 10 toward the circumference. The first color LEDs 21 are first light sources that emit light having a first correlated color temperature (e.g., light of a light bulb color), and the second color LEDs 22 are second light sources that emit light having a second correlated color temperature higher than the first correlated color temperature (e.g., light of a daylight color). For example, the correlated color temperatures are 2700K for the LEDs 21 and 5700K for the LEDs 22.

[0130] exist Fig. 9In addition to the positions where LED 21 and LED 22 are arranged, a plurality of third color LEDs 23 are arranged in the positions indicated by black, and a plurality of fourth color LEDs 24, a plurality of fifth color LEDs 25, a plurality of sixth color LEDs 26, and a plurality of seventh color LEDs 27 are arranged in the positions indicated by shadow. Even in the above arrangement, LEDs 21 to 27 can be arranged by making the luminous flux Figure 6 The ratio shown in the figure thus exhibits high color rendering properties.

[0131] exist Fig. 9 , a wiring 31 is illustrated, which is used to connect a plurality of LEDs 21 in series; a wiring 32 is used to connect a plurality of LEDs 22 in series; and a wiring 33 is used to connect a plurality of LEDs 23 in series. Each wiring 31, 32, 33 is connected to an LED driver 30. In this way, by radially arranging a plurality of first color LEDs 21 and a plurality of second color LEDs 22, color unevenness in the light emitting module 1 can also be suppressed, and in addition, the intersection of each wiring and the complication of the circuit can be avoided.

[0132] (Implementation Method 2)

[0133] Hereinafter, a lighting device according to a second embodiment of the present invention will be described with reference to the drawings. The configuration and operation of the light emitting module 1 are the same as those of the first embodiment.

[0134] (lighting device)

[0135] A spotlight lighting device 200 which is a lighting device to which the light emitting module 1 according to the present embodiment is applied will be described. Fig.10 2 is a block diagram of a spotlight lighting device 200 of this embodiment. The spotlight lighting device 200 includes the same light emitting module 1, heat dissipation unit (heat sink) 101 and housing 102 as in Embodiment 1, and also includes a reflecting unit (reflector) 201, a diffuser plate 202, a lens 203 and a lens diffuser plate 204. In addition, the spotlight lighting device 200 includes a power supply (not shown) and a control device 40 for controlling the correlated color temperature and brightness of the irradiated light.

[0136] The heat dissipation unit (heat sink) 101 radiates heat generated in the light emitting module 1 to the outside. The light emitting module 1 is provided at one end of the heat dissipation unit 101. The heat dissipation unit 101 is composed of, for example, a plurality of heat dissipation plates made of copper or the like, heat pipes connected to the plurality of heat dissipation plates, and the like.

[0137] The housing 102 is a box-shaped member provided to cover the heat dissipation unit 101 and the light emitting module 1 and supported by legs. A circular opening is provided at the end of the housing 102 on the light emitting module 1 side. The housing 102 is made of, for example, aluminum alloy.

[0138] The reflective portion 201 is located between the light emitting module 1 and the opening of the housing 102, and reflects and mixes the light emitted by the light emitting module 1. The reflective portion 201 has a cylindrical shape, and has a reflective surface on the inner wall of the cylindrical shape. That is, the reflective surface extends in a vertical direction relative to the arrangement surface of the light emitting elements (LEDs 21 to 27) of the light emitting module 1. The reflective surface of the reflective portion 201 is made of any reflective material such as an aluminum reflective material.

[0139] The diffuser plate 202 is provided at the opening of the housing 102 substantially parallel to the arrangement plane of the light emitting elements (LEDs 21 to 27) of the light emitting module 1. That is, the diffuser plate 202 is located on the opposite side of the light emitting module 1 from the reflector 201. The diffuser plate 202 diffuses the light emitted by the light emitting module 1 and reflected and mixed by the reflector 201, thereby correcting the unevenness of the light. The diffuser plate 202 has a disc shape and is made of, for example, an acrylic plate or polycarbonate.

[0140] The lens 203 is located on the opposite side of the light emitting module 1 of the diffuser 202, and is disposed approximately parallel to the diffuser 202 at a fixed distance from the diffuser 202. That is, the lens 203 is disposed approximately parallel to the arrangement surface of the light emitting elements (LEDs 21 to 27) of the light emitting module 1. The lens 203 converges or diverges the light emitted by the light emitting module 1. The lens 103 is, for example, a Fresnel lens having a sawtooth-shaped cross section.

[0141] The lens diffuser 204 has the characteristic of diffusing and shaping the light transmitted through the lens 203 by being used together with the lens 203. The light transmitted through the lens diffuser 204 can be limited within a predetermined range of the emission angle. The lens diffuser 204 is, for example, a Light Shaping Diffuser (LSD). The lens diffuser 204 is arranged approximately parallel to the lens 203, and preferably, is located on the opposite side of the light emitting module 1 relative to the lens 203.

[0142] The characteristics of the lens 203 and the lens diffuser plate 204 are selected according to the illumination of the spotlight lighting device 100 or the required specifications including the 1 / 2 illumination angle. The lens 203 and the lens diffuser plate 204 are supported by a lens housing 205, and the lens housing 205 is fixed relative to the housing 102, and the housing 102 has the light emitting module 1. The lens housing 205 can be detachable from the housing 102, or can be integrated with the housing 102.

[0143] The spotlight lighting device 200 configured as described above has higher illumination and can suppress color separation compared to a configuration not including the reflector 201, the diffuser 202, the lens 203, and the lens diffuser 204. Therefore, the generation of a bluish-white ring portion generated around the conventional spotlight lighting can be suppressed.

[0144] The spotlight lighting device 200 may include both the reflector 201 and the diffuser plate 202 , and the lens 203 and the lens diffuser plate 204 , or may include any one of them.

[0145] In addition, the spotlight lighting device 200 may further include: a position adjustment mechanism for adjusting the position of the light emitting module 1 relative to the lens 203; and a color filter for changing the color of the irradiated light.

[0146] According to the spotlight lighting device 200 of this embodiment, as described above, the light emitting module 1 with high color rendering is used as a light source and radiates light efficiently, so that light close to natural light can be irradiated and can be well used in performance spaces such as stages and studios.

[0147] In addition, here, an example in which the light emitting module 1 is applied to the spotlight lighting device 200 is described as a lighting device, but the lighting device is not limited to a spotlight, and any lighting device (such as a light bulb) including the light emitting module 1 may be used.

[0148] The present invention can implement various embodiments and variations without departing from the broad spirit and scope of the present invention. In addition, the above-mentioned embodiments are only used to illustrate the present invention and do not limit the scope of the present invention. That is, the scope of the present invention is not represented by the embodiments, but by the claims. In addition, various variations implemented within the scope of the claims and within the scope of the meaning of the invention equivalent thereto are also considered to be within the scope of the present invention.

[0149] This application is based on Japanese patent application No. 2021-55101 filed on March 29, 2021, and all the specifications, claims and drawings of Japanese patent application No. 2021-55101 are incorporated herein by reference.

[0150] [Explanation of Reference Numerals]

[0151] 1 light emitting module,

[0152] 10 base plates,

[0153] 21~27LED,

[0154] 30LED drivers,

[0155] 31~33 wiring,

[0156] 40 control devices,

[0157] 40a: a storage unit,

[0158] 40b processor,

[0159] 100, 200 spotlight lighting device,

[0160] 101 heat dissipation unit,

[0161] 102 housing,

[0162] 201 reflection part,

[0163] 202 diffuser plate,

[0164] 203 lens,

[0165] 204 lens diffuser,

[0166] 205 lens housing.

Claims

1. A light emitting module, characterized in that: include: a first light source that emits light having a first correlated color temperature, a second light source that emits light having a second correlated color temperature higher than the first correlated color temperature, and 5 kinds of colored light sources, which can emit light of different luminous colors; By making the first light source, the second light source, and the five colored light sources emit light with luminous intensities in predetermined proportions, a mixed light with a correlated color temperature of above 5000K and below 6500K, an average color rendering index Ra of above 98, a special color rendering index R9 of above 98, and a special color rendering index R12 of above 94 can be emitted.

2. The light emitting module according to claim 1, characterized in that: The first correlated color temperature is 2700K.

3. The light emitting module according to claim 1, characterized in that: The second correlated color temperature is 5700K.

4. The light emitting module according to claim 1, characterized in that: The first light source is a bulb-colored light source, and the second light source is a white light source; The five colored light sources include a purple light source, a blue light source, a blue-green light source, a yellow-green light source and a red light source.

5. The light emitting module according to claim 1, characterized in that: By making the first light source, the second light source, and the five colored light sources emit light with luminous intensities in predetermined proportions, mixed light with a correlated color temperature of 5000K or more and 6500K or less, and an average color rendering index Ra and a special color rendering index R9 of 99 can be emitted.

6. The light emitting module according to claim 4, characterized in that: By making the first light source, the second light source, and the yellow-green light source emit light with a sufficiently higher intensity than the total of the light intensities of the five colored light sources except the yellow-green light source, mixed light with a correlated color temperature of more than 5000K and less than 6500K is emitted.

7. The light emitting module according to claim 1, characterized in that: It also includes a dimming control component, which can dim the first light source, the second light source, and the five colored light sources at predetermined levels of resolution; The dimming control component combines FM dimming, PWM dimming, and DC dimming to perform dimming.

8. The light emitting module according to claim 1, characterized in that: The plurality of first light sources and the plurality of second light sources are respectively arranged radially in a direction from the vicinity of the center toward the circumference of the circular substrate.

9. A lighting device, comprising the light emitting module according to any one of claims 1 to 8.

10. The lighting device according to claim 9, wherein: Also included is a control device that controls a dimming control component that dims the first light source, the second light source, and the five colored light sources; The control device includes a storage unit, which pre-stores a table representing the relationship between the luminous intensity of the first light source, the second light source, and the five colored light sources and the correlated color temperature. The control device determines the luminous intensity of the first light source, the second light source, and the five colored light sources corresponding to the desired correlated color temperature with reference to the table stored in the storage unit, and controls the dimming control component based on the determined luminous intensity.

11. The lighting device according to claim 9, characterized in that: include: a reflecting portion having a reflecting surface perpendicular to the arrangement surface of the first light source, the second light source, and the five colored light sources of the light emitting module, and reflecting the light emitted by the light emitting module, and The diffusion plate is provided on the opposite side of the light emitting module from the reflection part and diffuses the light reflected by the reflection part.

12. The lighting device according to claim 9, characterized in that: include: a lens extending substantially parallel to the arrangement plane of the first light source, the second light source, and the five colored light sources of the light emitting module, so as to converge or diverge the light emitted by the light emitting module, and The lens diffuser extends substantially parallel to the lens and diffuses and shapes the light passing through the lens.

Images