JP2010092993A - Illuminating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminating apparatus for improving color rendering properties and light-emitting efficiency and changing a color temperature or a light color of an illuminating light. <P>SOLUTION: The illuminating apparatus 10 is configured to have a lemon-color LED 23 having a blue-color LED element and a yellow-color phosphor, a blue-color LED 22c, a green-color LED 22b, and a red color LED 22a. Light amounts of the blue-color LED 22c, the green-color LED 22b, and the red color LED 22a are controlled to change the color temperature or light color of the illuminating light. The lemon-color LED 23 is configured so that a peak value of blue-color spectrum becomes 20% or less of a peak value of spectrum which mainly includes yellow-color. The peak wavelength of the lemon-color LED 23 is brought close to a wavelength region of about 580 nm to compensate a spectrum of the missing part close to 580 nm and improve color rendering properties. In addition, since the spectrum which mainly includes yellow color includes a half-value width wider than that of an LED without a phosphor, the light amount of wavelength region close to 555 nm is increased to improve light-emitting efficiency. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an illumination device capable of changing the color temperature or light color of illumination light by controlling the light amounts of a plurality of light sources having different emission colors.

  2. Description of the Related Art Conventionally, lighting devices including light sources such as incandescent bulbs and fluorescent lamps have been used as lighting devices used for indoor lighting in homes and offices. In recent years, with the increase in luminance of light emitting diodes (hereinafter abbreviated as LEDs), instead of these light sources, LEDs having characteristics such as low power consumption and long life have been used as light sources for lighting devices.

  The functions required of these lighting devices have been diversified in order to improve the comfort of the user in consideration of not only the visibility of brightly illuminating the surroundings but also the influence of light on the living body. For example, adjusting the sleep and awakening rhythm (biological rhythm) by increasing or decreasing the spectrum of a specific wavelength (near 464 nm), affecting the human psychology by changing the color temperature to high or low, etc. Functions are required. For this reason, various illuminating devices configured to be able to adjust the color temperature of illumination light have been proposed.

  In an illuminating device using an LED as a light source, LEDs of three different emission colors of blue LED, green LED, and red LED are used, and the light emission color to daylight color range is controlled by controlling the emission intensity of each of these LEDs. The color temperature of the illumination light can be freely changed over the period. FIG. 11 is a diagram showing a spectral distribution when the blue LED, the green LED, and the red LED are turned on so that the color temperature of the illumination light is 5000K. In FIG. 11, the horizontal axis represents wavelength (nm) and the vertical axis represents relative intensity. As shown in FIG. 11, the illumination light obtained by superimposing light from these three types of LEDs has almost no spectrum in the wavelength region near 580 nm. This is because blue LEDs, green LEDs, and red LEDs have excellent monochromaticity, that is, the half-value width of the emission spectrum is narrower than incandescent bulbs or fluorescent lamps. As a result, there is a problem that a yellow-orange object cannot be seen in a correct color and color rendering is not good. The color rendering property is the property of the light source that affects the color appearance. The better the color rendering property, the more the color of the object looks natural.

  Therefore, an illumination provided with an LED having an emission spectrum that compensates for a wavelength region (particularly, around 580 nm between green and red) that lacks the emission spectrum of blue, green, and red when these three types of LEDs emit light. A light source has been proposed (see, for example, Patent Document 1).

The illumination light source disclosed in Patent Document 1 includes four types of LEDs, a blue LED, a blue-green LED, an orange LED, and a red LED, and the color temperature of the illumination light is controlled by controlling the light emission intensity of the plurality of LEDs. Is configured to change. The orange LED is an LED having a peak wavelength in a wavelength region of 580 to 600 nm. As a result, it is possible to supplement the spectrum of the missing portion in the vicinity of 580 nm between green and red, and to improve the color rendering.
JP 2003-45206 A

  By the way, on human retina, as photoreceptors, rod cells that perceive light and darkness with dark vision (about 0.01 lux or less) and cones that perceive color with photopic vision (about 10 lux or more). There are cells. When light of a certain radiant energy enters the human eye, a sense of brightness is generated in response to a stimulus applied to the photoreceptor. Visibility, which is a proportion of the radiant energy that is an effective stimulus for generating a sense of brightness, varies depending on the wavelength of light. And it is known that the maximum visibility in photopic vision is 555 nm (wavelength region corresponding to yellow-green). It should be noted that the higher the visibility, the brighter sensation can be generated with less radiant energy, and the total luminous flux can be increased, in other words, the luminous efficiency can be increased.

  However, since the illumination light source of Patent Document 1 uses an orange LED having a peak wavelength in the wavelength region of 580 to 600 nm as an LED that supplements the spectrum of the missing portion in the vicinity of 580 nm, the amount of light in the wavelength region near 555 nm is not much. There has been a problem that the luminous efficiency has not been improved and the improvement in luminous efficiency is insufficient.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an illuminating device that can improve color rendering properties and luminous efficiency and can change the color temperature or light color of illumination light. And

  An illumination device according to the present invention is configured to change the color temperature or light color of illumination light by controlling the light amounts of a plurality of light sources having different emission colors, wherein the plurality of light sources are blue light sources, The lemon light source includes a green light source, a red light source, and a lemon light source, and the lemon light source includes a blue light source and a yellow phosphor excited by light emitted from the blue light source.

  In the present invention, using a blue light source, a lemon color light source having a yellow phosphor excited by light emitted from the blue light source, a blue light source, a green light source, and a red light source, The color temperature or light color of the illumination light is changed by controlling the light quantity of the light source. By appropriately setting the amount of the phosphor, the peak wavelength of the lemon light source can be brought close to the wavelength region near 580 nm, and the color rendering can be improved by supplementing the spectrum of the missing portion near 580 nm. In addition, since the lemon color light source has a phosphor and the half width of the spectrum mainly composed of yellow is wider than that of the light source not having the phosphor, the light emission efficiency is increased by increasing the amount of light in the wavelength region near 555 nm. Can be improved.

  The lighting device according to the present invention is characterized in that the lemon light source is configured such that a peak value of a blue spectrum is 20% or less of a peak value of a spectrum mainly composed of yellow.

  In the present invention, since the lemon color light source is configured such that the peak value of the blue spectrum is 20% or less of the peak value of the spectrum mainly composed of yellow, most of the spectral distribution of the lemon color light source is The spectrum is mainly yellow. As a result, the peak wavelength of the lemon color light source can be brought close to the wavelength region near 580 nm, and the color rendering can be improved by supplementing the spectrum of the missing portion near 580 nm. In addition, since the half width of the spectrum mainly composed of yellow is wider than that of a light source not having a phosphor, the light emission efficiency can be improved by increasing the amount of light in the wavelength region near 555 nm.

  The illuminating device according to the present invention is characterized in that the lemon-colored light source is configured such that a wavelength region in the vicinity of 555 nm is included in a wavelength region of a half width of a spectrum mainly composed of yellow.

  In the present invention, since the lemon color light source is configured so that the wavelength region near 555 nm is included in the wavelength region of the half width of the spectrum mainly composed of yellow, the amount of light in the wavelength region near 555 nm is further increased. The luminous efficiency can be improved by increasing.

  The illumination device according to the present invention is characterized in that the lemon light source has a peak wavelength in a wavelength region of 540 nm to 580 nm.

  In the present invention, since the lemon light source has a peak wavelength in the wavelength region of 540 to 580 nm, the color rendering can be improved by supplementing the spectrum of the missing portion in the vicinity of 580 nm, and in the wavelength region in the vicinity of 555 nm. Luminous efficiency can be improved by increasing the amount of light.

  In the illumination device according to the present invention, the lemon color light source has a peak wavelength in a wavelength region near 560 nm.

  In the present invention, since there is a peak wavelength of the lemon light source in the wavelength region near 560 nm, the color rendering can be further improved by supplementing the spectrum of the missing portion near 580 nm, and the peak wavelength of the lemon light source. Is very close to 555 nm, which has a high visibility, so that the luminous efficiency can be further improved.

  The illumination device according to the present invention is configured to change the color temperature of the illumination light by controlling the light amounts of the blue light source, the green light source, and the red light source.

  In the present invention, it is configured to change the color temperature of the illumination light by controlling the light amount of the blue light source, the green light source and the red light source while keeping the light amount of the lemon color light source constant. Control can be simplified by minimizing the number of light sources for controlling the amount of light.

  In the illumination device according to the present invention, the blue light source, the green light source, and the red light source are LEDs.

  In the present invention, LEDs are used as a blue light source, a green light source, and a red light source, and the LEDs have excellent monochromaticity. Therefore, by controlling the light emission intensity of each LED, the color of the illumination light Temperature or light color can be adjusted freely.

  According to the present invention, color rendering properties and light emission efficiency can be improved, and the color temperature or light color of illumination light can be changed.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. FIG. 1 is a schematic external perspective view of a lighting apparatus 10 according to an embodiment of the present invention. FIG. 2 is a schematic exploded perspective view of the illumination device 10 according to the embodiment of the present invention.

  In the figure, reference numeral 1 denotes a frame having a housing shape with an opening on one surface. The frame 1 stands on the rectangular plate portion (not shown), a peripheral wall 11 erected along the peripheral edge of the rectangular plate portion, and parallel to two opposing sides of the peripheral wall 11. And provided partition plate portions 12 and 12. The frame 1 is made of metal such as aluminum.

  Inside the frame 1, a plurality (four in the figure) of LED modules 2, 2... Are arranged at a portion sandwiched between the peripheral wall 11 and the partition plates 12, 12 on one surface of the rectangular plate. Two are attached along the longitudinal direction of 12,12.

  FIG. 3 is a diagram illustrating an arrangement example of the LEDs of the LED module 2. The LED module 2 includes a rectangular LED board 21 and color LEDs 22, 22... And lemon LEDs 23, 23. The color LED 22 is formed by packaging a red LED 22a, a green LED 22b, and a blue LED 22c in a line in this order. The red LED 22a, the green LED 22b, and the blue LED 22c are surface-mount LEDs that include an LED element, a sealing resin that seals the LED element, and an input terminal and an output terminal. In addition, red LED22a, green LED22b, and blue LED22c have the outstanding monochromaticity, and a half value width is about 20-30 nm.

  On the other hand, the lemon LED 23 as a lemon light source is a blue LED element as a blue light source, a yellow phosphor that emits yellow light when excited by light from the blue LED element, and the yellow phosphor is dispersed, It is a surface mount type LED provided with sealing resin which seals a blue LED element. The light from the lemon LED 23 is a combined light of light emitted from the blue LED element (blue spectrum) and light emitted from the yellow phosphor when excited by the light (spectrum mainly composed of yellow). The LED having a blue LED element and a yellow phosphor has a higher probability that the light from the blue LED element will collide with the yellow phosphor as the amount of the yellow phosphor in the sealing resin increases. While the emission intensity of yellow light emitted when the body is excited increases, the emission intensity of blue light tends to decrease due to being blocked by the yellow phosphor. Therefore, as the amount of yellow phosphor dispersed in the sealing resin increases, the emission color of the LED changes from blue to pseudo white to yellow. For example, Ce: YAG (cerium activated yttrium / aluminum / garnet) phosphor or BOS phosphor (BaSr) 2SiO4: Eu2 + is used as the yellow phosphor of the lemon LED 23 according to the present embodiment. Note that the blue light source of the lemon color light source is not limited to the blue LED, but may be a semiconductor laser light source or an organic EL (Electro-Luminescence) light source capable of emitting blue light.

  FIG. 4 is a diagram showing the spectral distribution of the lemon color LED 23 according to the present embodiment. The horizontal axis in FIG. 4 indicates the wavelength (nm), and the vertical axis indicates the relative intensity. As shown in FIG. 4, the lemon LED 23 has a peak wavelength of 560 nm, and the peak value of the blue spectrum is 20% or less (about 10% in this embodiment) of the peak value of the spectrum mainly composed of yellow. The amount of yellow phosphor is set so as to emit a lemon-colored light. In addition, the half value width of lemon color LED23 is wide, for example, is about 90 nm.

  The color LEDs 22, 22... And the lemon LEDs 23, 23... Are arranged so as to be staggered (alternate) as shown in FIG. The color LEDs 22, 22... Are arranged with their directions reversed every two rows. Thereby, the light from LED module 2 becomes a more uniform color mixture, and the favorable illumination light which does not give a sense of incongruity to a user can be provided. That is, a color LED in which a red LED, a green LED, and a blue LED are arranged in a line like the color LED 22 is mounted on the LED substrate 21 in the same direction without being inverted every two rows. When the LED substrate 21 is observed from various directions, there is a problem that the same color of light is strongly observed, giving the user a sense of discomfort. Therefore, by inverting the arrangement every two rows as described above, the user can perceive that light of a uniform color is irradiated regardless of which direction the illumination device is viewed.

  Power supply boxes 30 and 30 are attached to a central portion sandwiched between the partition plates 12 and 12 inside the frame 1. The power supply boxes 30 and 30 accommodate a power supply circuit in which electronic components such as a capacitor and a transformer are mounted on a power supply circuit board. The AC voltage supplied from the external power supply is converted and rectified into a DC voltage by the power supply circuit and supplied to the LED modules 2, 2.

  In addition, a control circuit box 40 is attached to a central portion sandwiched between the partition plate portions 12 and 12 inside the frame 1. Inside the control circuit box 40, control circuits for controlling the light emission intensities of the red LEDs 22a, 22a, green LEDs 22b, 22b, blue LEDs 22c, 22c, and lemon LEDs 23, 23,. It is. A center cover 5 having an elongated rectangular plate shape is fitted around the opening of the central portion of the frame 1.

  On the other hand, side covers 6 and 6 are provided at openings on both sides of the center cover 5 of the frame 1. As shown in the figure, the side cover 6 includes a substantially U-shaped frame portion 61, side wall portions 62 erected on three sides along the outer peripheral edge of the frame portion 61, and side wall portions 62 on the frame portion 61. And fixed plate portions 63, 63,.

  On the inner surfaces of the frame portions 61 of the side covers 6 and 6, diffusion plates 7 and 7 each having a rectangular plate shape are provided so as to cover the LED modules 2. Rectangular holes 7a and 7a are provided on both sides of the diffusion plate 7 in the longitudinal direction. The diffusing plates 7 and 7 are milky white resins to which a diffusing agent is added, and are made of, for example, polycarbonate resin.

  The side cover 6 is externally fitted to the frame 1 with the fixing plate portions 63 and 63 being inserted into the rectangular holes 7 a and 7 a of the diffusion plate 7 and the diffusion plate 7 being in contact with the inner surface of the frame portion 61. It is. In this state, the male screws are inserted into the through holes provided in the fixing plate portions 63, 63, and the male screws are engaged with the female screws provided in the frame 1, whereby the side covers 6 and 6 are attached to the frame. 1 is fixed. The lighting device 10 configured as described above is attached to the ceiling such that the rectangular plate portion side of the frame 1 is the ceiling side.

  FIG. 5 is a block diagram showing an example of the configuration of the control system of lighting apparatus 10 according to the present embodiment. As described above, the power supply circuits 3 are arranged in a distributed manner in the power supply boxes 30 and 30 by mounting electronic components (not shown) such as capacitors and transformers on the power supply circuit board. The power supply circuit 3 is connected to a commercial AC power supply through a terminal block provided at an appropriate site. The power supply circuit 3 includes a rectifier circuit that rectifies a current supplied from a commercial AC power supply, a transformer that converts the rectified voltage into a predetermined voltage, a constant current supply circuit that supplies a constant current, and the like. The power supply circuit 3 is connected to a control unit 4, which is a control circuit provided inside the control circuit box 40, and the power supply circuit 3 supplies the control unit 4 with a power supply of a predetermined voltage with a constant current.

  The control unit 4 includes a control microcomputer (hereinafter abbreviated as a microcomputer) 41 for controlling the light emission intensity of the LED modules 2, 2..., A storage unit 42 for storing control programs, control pattern information, and setting contents, and an illumination device. The time information acquisition part 43 which acquires time information with the clock part 8 distribute | arranged to the 10 appropriate | suitable site | parts, and the signal receiving part 44 which receives the signal from the signal transmission part 9 are provided. A storage unit 42, a time information acquisition unit 43, and a signal reception unit 44 are connected to the microcomputer 41, respectively. The signal transmission unit 9 selects, for example, one illumination mode from a power switch that accepts an operation for turning on / off the illumination device and a plurality of illumination modes having different color temperatures (eg, light bulb color, daylight white, daylight color). A switch that accepts an operation to change the color temperature of the illumination light according to the user's preference, a switch that accepts an operation to change the intensity of the blue, green and red of the illumination light, and depending on the operation of these switches And an infrared remote controller including a transmission unit that transmits infrared signals.

  Similarly to the microcomputer 41, drive circuits 45a, 45b, 45c, and 45d provided in the control circuit box 40 are connected. Power is supplied from the power supply circuit 3 to the drive circuits 45a, 45b, 45c, and 45d. Red LEDs 22a, 22a,..., Green LEDs 22b, 22b, blue LEDs 22c, 22c, and lemon LEDs 23, 23 are connected to the drive circuits 45a, 45b, 45c, and 45d, respectively. In FIG. 5, the red LEDs 22a, 22a..., The green LEDs 22b, 22b..., The blue LEDs 22c, 22c. is doing.

  The microcomputer 41 reads the control program stored in the storage unit 42 and, according to the read control program, according to the time information given by the time information obtaining unit 43 or the setting content given by the signal receiving unit 44. Determine the spectral distribution of the illumination light. For example, according to the time information, in the morning time zone, in order to suppress the secretion of melatonin, a spectral distribution including a lot of spectra in the vicinity of a specific wavelength (464 nm) region, and in the night time zone, the secretion of melatonin. In order to prevent the suppression of the spectral distribution, each of the spectral distributions containing almost no spectrum in the vicinity of the specific wavelength region is selected. A plurality of spectral distributions of illumination light are prepared in advance, and the storage unit 42 has red LEDs 22a, 22a, green LEDs 22b, 22b, blue LEDs 22c, 22c, and lemon LEDs 23, 23 corresponding to the spectral distributions. ... the control pattern information for each is stored.

  The microcomputer 41 reads control pattern information corresponding to the determined spectral distribution from the storage unit 42 and generates a dimming signal. This control pattern information is to adjust the emission intensity of each of the red LEDs 22a, 22a ..., green LEDs 22b, 22b ..., blue LEDs 22c, 22c ... and lemon LEDs 23, 23 ... so that the illumination light has a determined spectral distribution. This is data for generating a dimming signal to be provided to the provided drive circuits 45a, 45b, 45c, and 45d. The dimming signal is a current signal according to the current-luminance characteristics of the red LED 22a, the green LED 22b, the blue LED 22c, and the lemon LED 23, and is a signal such as a pulse width modulation signal, for example.

  The drive circuits 45a, 45b, 45c, and 45d are each provided with a switching element, and are configured to open and close the switching element according to a dimming signal given by the microcomputer 41. A predetermined current is supplied to the drive circuits 45a, 45b, 45c, and 45d according to the switching operation of the switching element, and the red LEDs 22a, 22a,..., The green LEDs 22b, 22b, the blue LEDs 22c, 22c, and the lemon LEDs 23, 23,. Each is supplied / cut off according to the opening / closing operation of the switching element, and is lit at the emission intensity according to the spectral distribution determined by the microcomputer 41. As a result, illumination light having a predetermined brightness and color temperature is obtained.

  6 to 8 are diagrams illustrating an example of a spectral distribution of the illumination device 10 according to the present invention, in which the horizontal axis indicates the wavelength (nm) and the vertical axis indicates the relative intensity. FIG. 6 shows a spectral distribution of daylight color in which the color temperature of illumination light is 6500K. FIG. 7 shows a spectral distribution of daylight white in which the color temperature of the illumination light is 5000K. FIG. 8 shows a spectral distribution of the light bulb color in which the color temperature of the illumination light is 2800K. These spectral distributions are obtained by changing the current ratios of the red LEDs 22a, 22a, green LEDs 22b, 22b, blue LEDs 22c, 22c, and lemon LEDs 23, 23,.

  FIG. 9 is a relationship diagram between the color temperature and each current ratio. In FIG. 9, the horizontal axis indicates the color temperature (K), and the vertical axis indicates each current ratio. As shown in FIG. 9, the lighting device 10 keeps the current of the lemon LEDs 23, 23... (Indicated by a one-dot chain line in the figure) constant, and the current of the red LEDs 22 a, 22 a. By changing the current of the green LEDs 22b, 22b ... (indicated by the two-dot chain line in the figure) and the current of the blue LEDs 22c, 22c ... (indicated by the solid line in the figure), as shown in FIGS. The color temperature can be changed over the range of color to daylight (2800 to 6500K). At this time, the average color rendering index Ra, which is a representative index of color rendering properties, is 90 or more, and the luminous efficiency is about 50 to 70 (lm / W). In general, a light source having an average color rendering index Ra of 80 or more is evaluated as having good color rendering properties. As described above, the lemon-colored LED 23 emits light having a spectral wavelength distribution with a peak wavelength of 560 nm and a wide half-value width, and is therefore missing in the spectral distribution obtained by superimposing the emission spectra of the red LED, the green LED, and the blue LED. The illumination device 10 can be brought close to the reference light source by compensating for the spectrum near 580 nm, and thus the color rendering can be enhanced. Moreover, since the peak wavelength of the lemon-colored LED 23 is very close to 555 nm, which has high visibility, the total luminous flux can be increased, and the luminous efficiency (31 [lm / mm / mm] of the combination of red LED, green LED, and blue LED) W] degree), the luminous efficiency of the lighting device 10 can be significantly improved. The reference light source is, for example, a light source having a color rendering index of 100 when evaluated by a color rendering property evaluation method defined in JIS-Z-8726.

  The illuminating device 10 according to the present invention configured as described above uses the color LED 22 having the red LED 22a, the green LED 22b, and the blue LED 22c, and the lemon LED 23, and the light emission intensity of the red LED 22a, the green LED 22b, and the blue LED 22c ( The color temperature can be changed over the range of light bulb color to daylight color (2800 to 6500K) by controlling the amount of light), and the color rendering property can be improved by supplementing the spectrum of the missing portion of the color LED 22 near 580 nm. it can. In addition, the amount of light in the wavelength region near 555 nm, which is the maximum visibility in photopic vision, can be increased to increase the total luminous flux, and the luminous efficiency can be improved.

  In addition, since the illumination device 10 is configured to include red, green, and blue light sources, so-called full color reproduction is possible similarly to a television receiver and the like, and not only the color temperature but also the illumination color can be freely adjusted. In addition, it is possible to control the color rendering as described above while suppressing the increase in cost by constructing based on the existing red, green and blue LEDs that are not special wavelength characteristic LEDs for the purpose of controlling the color temperature. Effects such as improvement in light emission efficiency and luminous efficiency can be obtained.

  Further, the color temperature of the illumination light is changed by controlling the light amounts of the red LEDs 22a, 22a..., The green LEDs 22b, 22b... And the blue LEDs 22c, 22c. Therefore, the control can be simplified by minimizing the number of light sources for controlling the amount of light.

  In the present embodiment, the color LED 22 in which the red LED 22a, the green LED 22b, and the blue LED 22c are packaged is used. However, the present invention is not limited to this, and a single red LED, green LED, and blue LED may be used. . An example of LED arrangement in this case is shown in FIG. FIG. 10 is a diagram illustrating an arrangement example of other LEDs in the LED module.

  As shown in FIG. 10, the LED module 2a includes a rectangular LED board 21, and red LEDs 24, 24, green LEDs 25, 25, blue LEDs 26, 26, and lemon colors provided on the LED board 21. LED23,23 ... is provided. The red LEDs 24, 24 ..., the green LEDs 25, 25 ..., the blue LEDs 26, 26 ..., and the lemon-colored LEDs 23, 23 ..., as shown in the figure, the odd rows are red, green, blue, and lemon color, and the even rows are blue. , Lemon color, red, green. The red LED 24, the green LED 25, the blue LED 26, and the lemon LED 23 have the same configuration as the red LED 22a, the green LED 22b, the blue LED 22c, and the lemon LED 23 described in FIG. 3, and a detailed description thereof is omitted. By arranging the LEDs in this way, the light from the LED module 2a becomes a more uniform color mixture, and good illumination light that does not give the user a sense of incongruity can be provided.

  3 and 10 is not limited to the case where the LEDs according to the above embodiments are used, and can be applied when a plurality of light sources having different emission colors are used. For example, even when only an LED that does not contain a phosphor in the sealing resin is used, the light from the LED module becomes a more uniform color mixture, and good illumination light that does not give the user a sense of incongruity can be provided. The effect is obtained.

  In the above embodiment, the lemon-color LED 23 configured to emit light having a spectral distribution with a peak wavelength of 560 nm and a wide half-value width (for example, about 90 nm) is used as the lemon-colored light source. However, it is not limited to this. The lemon LED may be configured so that the peak value of the blue spectrum is 20% or less of the peak value of the spectrum mainly composed of yellow. By using such a lemon-colored LED, the peak wavelength of the lemon-colored LED can be brought close to the wavelength region near 580 nm, and the color rendering can be improved by supplementing the spectrum of the missing portion near 580 nm. Further, since the half width of the spectrum mainly composed of yellow is wider than that of an LED not having a phosphor, the light emission efficiency can be improved by increasing the amount of light in the wavelength region near 555 nm. In this case, from the viewpoint of improving the light emission efficiency, it is desirable that the lemon LED is configured such that the wavelength region near 555 nm is included in the wavelength region of the half width of the spectrum mainly composed of yellow.

  Moreover, the structure of the control system of the illuminating device shown in FIG. 5 is an example, and is not limited to this. The control unit 4 may have at least one of the time information acquisition unit 43 and the signal reception unit 44. In addition to the time information given by the time information acquisition unit 43 or the setting content given by the signal receiving unit 44, a human sensor for detecting a person, an illuminance sensor for detecting the illuminance around the lighting device, and the like You may comprise so that the light emission intensity | strength of several LED from which luminescent color differs may be controlled based on a detection result.

  In the above embodiment, an LED module in which a plurality of LEDs having different emission colors are mounted is used. However, the present invention is not limited to this, and a plurality of LEDs provided on a substrate are diffused with a phosphor. Other types such as an LED module covered with a sealing resin may be used. Moreover, in above embodiment, although LED is used as a lemon light source, the red light source used in combination with this lemon light source, the green light source, and the blue light source, it is not limited to LED. For example, a light source such as a semiconductor laser light source or an organic EL light source can be used. In particular, the lemon light source according to the present invention is used in combination with a red light source, a green light source, and a blue light source that emit light with excellent monochromaticity, thereby improving the color rendering property of illumination light by compensating for the missing portion near 580 nm. Is possible.

  Moreover, in the above embodiment, the lighting device has a plurality of light sources including a blue light source, a green light source, a red light source, and a lemon light source. By having a complementary light source, the color rendering can be improved. That is, the color rendering can be improved by complementing the short wavelength side (around 380 to 430 nm) for high color temperatures and the long wavelength side (around 680 to 780 nm) for low color temperatures.

  As a light source that complements the short wavelength side, for example, a blue LED (InGaN-based LED) as a blue light source having a peak wavelength of 430 nm and a half-value width of 50 nm is used. Experiments have shown that the number increases by about 2.0. In addition, as a light source that complements the long wavelength side, for example, a red LED (GaP-based LED) having a peak wavelength of 695 nm and a half-value width of 100 nm is used, and an average color rendering index is obtained by using a plurality of red light sources having different peak wavelengths. Experiments have shown that it increases by about 1.0. In addition, all the said experiments are results at 5000K.

  Moreover, in the above embodiment, as a lighting device, a so-called ceiling light having a flat rectangular parallelepiped shape that is provided on the ceiling and illuminates the entire room has been described as an example, but is not limited to a ceiling light, a downlight, It can be applied to other types of lighting devices such as backlights for liquid crystal display devices, and can be implemented in variously modified forms within the scope of the matters described in the claims. Needless to say.

It is a typical external appearance perspective view of the illuminating device which concerns on embodiment of this invention. It is a typical exploded perspective view of the illuminating device which concerns on embodiment of this invention. It is a figure which shows the example of arrangement | positioning of LED of an LED module. It is a figure which shows the spectral distribution of lemon color LED which concerns on this Embodiment. It is a block diagram which shows an example of a structure of the control system of the illuminating device which concerns on this Embodiment. It is a figure which shows an example of the spectral distribution of the illuminating device which concerns on this invention. It is a figure which shows an example of the spectral distribution of the illuminating device which concerns on this invention. It is a figure which shows an example of the spectral distribution of the illuminating device which concerns on this invention. It is a relationship diagram between color temperature and each current ratio. It is a figure which shows the example of arrangement | positioning of other LED of an LED module. It is a figure which shows spectral distribution when blue LED, green LED, and red LED are lighted so that the color temperature of illumination light may be 5000K.

Explanation of symbols

22a, 24 Red LED (Red light source)
22b, 25 Green LED (green light source)
22c, 26 Blue LED (blue light source)
23 Lemon LED (Lemon color light source)

Claims (7)

  In the illumination device configured to change the color temperature or light color of the illumination light by controlling the light amounts of the plurality of light sources having different emission colors, the plurality of light sources are a blue light source, a green light source, a red light source, and a lemon color. An illumination device comprising a light source, wherein the lemon-colored light source includes a blue light source and a yellow phosphor excited by light emitted from the blue light source.   The lighting device according to claim 1, wherein the lemon color light source is configured such that a peak value of a blue spectrum is 20% or less of a peak value of a spectrum mainly composed of yellow.   The lighting device according to claim 1, wherein the lemon color light source is configured such that a wavelength region near 555 nm is included in a wavelength region of a half width of a spectrum mainly composed of yellow.   The lighting device according to claim 1, wherein the lemon color light source has a peak wavelength in a wavelength region of 540 nm to 580 nm.   The lighting device according to any one of claims 1 to 4, wherein the lemon color light source has a peak wavelength in a wavelength region near 560 nm.   The illumination device according to any one of claims 1 to 5, wherein a color temperature of illumination light is changed by controlling light amounts of the blue light source, the green light source, and the red light source. .   The illumination device according to claim 1, wherein the blue light source, the green light source, and the red light source are LEDs.

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