JP5432478B2 - LED lighting device - Google Patents

Description

  The present invention relates to an LED lighting device including a plurality of types of light emitting devices having different emission colors.

  Conventionally, LED lighting devices have been proposed in which a plurality of types of light emitting devices having different emission colors are mounted on the same substrate to obtain mixed color light having a desired color temperature (see, for example, Patent Documents 1 and 2). .

  Here, for example, as shown in FIG. 11, the LED illumination device described in Patent Document 1 is an LED illumination device having a color temperature of 2 on the black body locus BL in the xy chromaticity diagram of the XYZ color system. A first light emitting device (main light source) set at a chromaticity point (hereinafter referred to as a white point) W between two chromaticity points Wmin and Wmax, a white point W and a chromaticity point Wmin having a low color temperature, A second light-emitting device (first auxiliary light source) having a light emission peak wavelength in the vicinity of the point L1 that intersects the spectrum locus SL when the straight line connecting the two is extended in the direction of Wmin, and the white point W and the chromaticity having a high color temperature. A third body light emitting device (second auxiliary light source) having a light emission peak wavelength in the vicinity of the point S1 that intersects the spectrum locus SL when a straight line connecting the point Wmax is extended in the direction of Wmax; It is possible to obtain a color temperature different from the color temperature of the main light source on BL Can, moreover, it is possible to correct the color rendering properties. Here, the first light emitting device emits broad yellow light when excited by an InGaN-based blue LED chip having a light emission peak wavelength in a wavelength region of 450 to 460 nm and blue light emitted from the blue LED chip. The second light emitting device is composed of an AlINGAP-based orange LED chip having a light emission peak wavelength at 590 nm, and is composed of a white LED that obtains white light in combination with a YAG phosphor. Is configured using a blue LED chip having an emission peak wavelength in a wavelength range of 470 to 480 nm. The LED lighting device described in Patent Document 1 is particularly suitable for a shadowless lamp, a living room lamp, a makeup lamp, and the like.

Further, the LED illumination device described in Patent Document 2 includes, for example, a light emitting device 110 using only a blue LED chip, a light emitting device 111 having a blue LED chip and a green phosphor, as shown in FIG. A light emitting device 112 having a blue LED chip and a red phosphor, a light emitting device 113 having a blue LED chip and a yellow phosphor, a light emitting device 114 using only a green LED chip, and a light output of each of the light emitting devices 110 to 114 And a control device 120 capable of adjusting the above.
JP 03/019072 (page 4, line 45 to page 5, line 8, page 5, line 24 to line 49, page 8, line 15 to line 44, and FIGS. 5, 7) JP 2007-122950 A (paragraphs [0018] to [0027] and FIGS. 1 to 3)

  By the way, in the LED lighting device disclosed in Patent Document 1, since the LED chip having a different emission peak wavelength is used for each light emitting device, the initial characteristics and the time-varying characteristics of the LED chip are different, and the ambient environment and the passage of time. This causes color misregistration. Here, in order to improve color reproducibility, a plurality of light detecting elements for detecting the light output of each light emitting device and a control circuit for feedback controlling the amount of current supplied to each LED chip of each light emitting device are provided. However, there is a problem that the cost becomes high.

  Also, in the LED lighting device having the configuration shown in FIG. 12 disclosed in Patent Document 2, since the blue LED chip and the green LED chip having different emission peak wavelengths are used as the LED chip, the initial characteristics of the LED chip are used. In addition, the time-varying characteristics are different, and color misregistration occurs due to the surrounding environment and time. Further, if three types of light emitting devices 110 to 112 among the above five types of light emitting devices 110 to 114 are used, only the blue LED chip can be used as the LED chip, but the light emitting device 110 using only the blue LED chip. Is stronger than the directivity of the other light emitting devices 111 and 112, and the blue emission color becomes conspicuous, and the color mixing property is low.

  The present invention has been made in view of the above-described reasons, and an object thereof is to provide an LED lighting device capable of improving color reproducibility and color mixing with a simple configuration without performing feedback control. .

The invention of claim 1 is an LED lighting device including a plurality of types of light emitting devices having different emission colors, and is defined on a black body locus in an xy chromaticity diagram of an XYZ color system based on desired mixed color light. Each of the polygons including a triangle connecting three chromaticity points of two chromaticity points and a chromaticity point located at the intersection of two tangents that touch the black body locus in each of the two chromaticity points. The plurality of types of the light emitting devices that emit colors of chromaticity points corresponding to the respective vertices, and the plurality of types of the light emitting devices include an LED chip and a phosphor excited by light emitted from the LED chip. Each of the light emitting devices is commonly provided with one type of the LED chip selected from the group of a blue LED chip, an ultraviolet LED chip, and a purple LED chip, and the color conversion unit Different emission colors There, each said light emitting device is characterized in that the color conversion unit are contained in common a plurality of types of phosphors as the fluorescent substance, that is with different mixing ratios of the plurality of types of phosphors.

According to the present invention, two chromaticity points defined on the black body locus in the xy chromaticity diagram of the XYZ color system based on the desired mixed color light, and the black body locus is in contact with each of the two chromaticity points. A plurality of types of light-emitting devices that emit colors of chromaticity points corresponding to respective vertices of a polygon including a triangle connecting three chromaticity points with a chromaticity point located at the intersection of two tangent lines; Since each light-emitting device has one type of LED chip selected from the group of blue LED chip, ultraviolet LED chip, and purple LED chip, and the emission color of the color conversion unit is different, the ambient environment and time passage The color misregistration caused by the light can be suppressed, and all the light-emitting devices need only be lit, so the circuit configuration for lighting is simple, and color reproducibility and color mixing with a simple configuration without feedback control. Enhance Door is possible.

According to the invention, in each of the light emitting devices, the color conversion unit contains a plurality of types of phosphors common as the phosphor, and the mixing ratio of the plurality of types of phosphors is varied. From the above, since the phosphor used in each light emitting device is the same, the initial characteristics and temporal change characteristics of the phosphor in each light emitting device are substantially the same, and color shift due to the surrounding environment and time passage is further suppressed. Color reproducibility can be further enhanced.

Another first shot light of the present application is a LED lighting device comprising a plurality of kinds of light emitting devices having different emission colors, on the black body locus in the xy chromaticity diagram of the XYZ color system based on the desired mixed color light Including a triangle connecting three chromaticity points, the two chromaticity points defined in the above, and the chromaticity point located at the intersection of two tangent lines that touch the black body locus at each of the two chromaticity points. The plurality of types of the light emitting devices that emit light of the chromaticity points corresponding to the respective vertexes of the squares are provided, and the plurality of types of the light emitting devices are excited by light emitted from the LED chip and the LED chip. Each of the light-emitting devices includes one LED chip selected from the group of a blue LED chip, an ultraviolet LED chip, and a purple LED chip, Change the emission color of the color converter Yes allowed, before Symbol a polygon triangle, as the light emitting device, a first light emitting device which comprises only red phosphor the color conversion unit emits red light as the phosphor, the color A second light emitting device in which the conversion unit contains only a green phosphor that emits green light as the phosphor, and a color phosphor that contains only a blue phosphor that emits blue light as the phosphor. And a third light emitting device.

According to the first shot Ming this, part of the green light emitted from the green phosphor is secondary absorption in the red phosphor can be prevented from being converted into the red light, the phosphor The luminous efficiency can be improved .

Another second shot light of the present application, in the first shot bright, in the xy chromaticity diagram, of the two said chromaticity point on the blackbody locus, the low color temperature side first chromaticity point The high color temperature side is the second chromaticity point,
The chromaticity point located at the intersection is a third chromaticity point,
The fourth chromaticity point is an intersection of a straight line that passes through the first chromaticity point and is parallel to the bisector of the corner corresponding to the third chromaticity point, and the spectral locus,
An intersection of a straight line passing through the first chromaticity point and parallel to the bisector of the corner corresponding to the third chromaticity point and a straight line connecting both ends of the spectrum locus is defined as a fifth chromaticity point.
The intersection of the spectrum locus and the straight line passing through the second chromaticity point and parallel to the bisector is defined as the sixth chromaticity point,
The seventh chromaticity point is an intersection of a straight line passing through the second chromaticity point and parallel to the bisector of the corner corresponding to the third chromaticity point and a straight line connecting both ends of the spectrum locus,
An intersection point between a straight line connecting the first chromaticity point and the second chromaticity point and the long wavelength side of the spectrum locus is defined as an eighth chromaticity point.
When the intersection of the straight line connecting the first chromaticity point and the second chromaticity point and the short wavelength side of the spectrum locus is the ninth chromaticity point,
In the xy chromaticity diagram, the chromaticity point of the second light emitting device includes a line between the first chromaticity point and the second chromaticity point on the black body locus, and the first chromaticity point. A straight line between the second chromaticity point and the sixth chromaticity point, a line between the sixth chromaticity point and the fourth chromaticity point on the spectrum locus, and the fourth chromaticity point. Set within a region surrounded by a chromaticity point and a straight line between the first chromaticity point;
In the xy chromaticity diagram, the chromaticity point of the first light emitting device includes a straight line between the first chromaticity point and the fifth chromaticity point, and the fifth chromaticity point. A straight line connecting the long wavelength end of the spectral locus, a line between the long wavelength end and the eighth chromaticity point on the spectral locus, the eighth chromaticity point, and the first color. Set within the area surrounded by the straight line between the degrees,
In the xy chromaticity diagram, the chromaticity point of the third light emitting device includes a straight line between the second chromaticity point and the seventh chromaticity point, and the seventh chromaticity point. A straight line connecting the short wavelength end of the spectral locus, a line between the short wavelength end and the ninth chromaticity point on the spectral locus, the ninth chromaticity point, and the second color. It is characterized in that it is set in an area surrounded by a straight line between degrees.

According to a second shot Ming this, it is possible to improve the color reproducibility more.

請 nucleophilic second aspect of the present invention, in the invention according to the first, each said light - emitting device, the color conversion unit is arranged to overlap with the LED chip, close the plurality of types of the light emitting device in a single package It is characterized by being arranged.

  According to the present invention, since the plurality of types of light emitting devices are arranged close to each other in one package, a shadow of an object existing between the irradiated surface and the LED illumination device is generated on the irradiated surface. In this case, it is possible to suppress color separation of the light emission colors of each of the plurality of types of light emitting devices around the shadow of the object, compared to a case where the plurality of types of light emitting devices have different packages, As a result, it is possible to suppress the occurrence of color unevenness around the shadow of the irradiated surface.

According to a third aspect of the present invention, in the second aspect of the present invention, the package includes one mounting substrate on which the plurality of types of the light emitting devices are mounted on one surface side, and the plurality of the plurality of light emitting devices on the one surface side of the mounting substrate. One sealing part which sealed the said light-emitting device of a seed | species is provided, The sealing part is formed with the translucent material containing the light-diffusion material, It is characterized by the above-mentioned.

  According to this invention, since one sealing portion that seals the plurality of types of light emitting devices is formed of a light-transmitting material containing a light diffusing material, color mixing can be improved, It is possible to suppress the occurrence of uneven color on the surface.

The invention of claim 4, claim 2 or in the invention of claim 3, the light blocking member between the light emitting device adjacent to each other in said package characterized by comprising disposed.

According to the invention, by the light shielding member is disposed between the light emitting device adjacent to each other in the package, the light from the other of the light emitting device to the color conversion section of each of the light - emitting device is irradiated that the can be prevented, thereby improving the accuracy of emission colors of each said light - emitting device.

The invention of claim 5, claim 2 or in the invention of claim 3, wherein the reflecting member is disposed between the light emitting device adjacent to each other in the package.

According to the invention, by reflecting member between the light emitting device adjacent to each other in the package are arranged, light from the other of said light emitting device to the color conversion section of each of the light - emitting device is irradiated that the can be prevented, thereby improving the accuracy of emission colors of each said light - emitting device.

Invention of claim 6, reflected claim 2 or in the invention of claim 3, the light from each of said light - emitting devices, each enclosing over the side surface of the color conversion section all around the color conversion unit It is characterized by comprising a frame body.

According to the invention, by providing a frame in which each said light - emitting device to reflect light from the color conversion section surrounds each over the side surface of the color conversion unit the entire circumference of each of the light - emitting device other of the can light from the light emitting device is prevented from being irradiated to the color conversion unit, it is possible to improve the accuracy of emission colors of each said light - emitting device.

A seventh aspect of the invention is characterized in that, in the sixth aspect of the invention, the frame is formed in a shape in which the opening area gradually increases as the distance from the LED chip increases.

According to the present invention, it is possible to increase the light extraction efficiency of each of the light - emitting device.

  According to the first aspect of the invention, there is an effect that it is possible to improve color reproducibility and color mixing with a simple configuration without performing feedback control.

(Embodiment 1)
The LED illumination device according to the present embodiment has two chromaticity points W1 and W2 defined on the black body locus BL in the xy chromaticity diagram of the XYZ color system shown in FIG. A triangle that includes three chromaticity points W1, W2, C and a chromaticity point C located at the intersection of two tangents that are in contact with the black body locus BL in each of the two chromaticity points W1, W2 is included. Plural types (in this embodiment) that emit light of chromaticity points (in this embodiment, chromaticity points R1, B1, and G1) corresponding to the vertices of each of the squares (in this embodiment, triangles connected by broken lines). 3 types) of light emitting devices 1a, 1b, and 1c (see FIG. 1A). FIG. 1B also shows a series of color matching temperature lines given by a straight line intersecting the black body locus BL.

  In the LED illumination device of the present embodiment, the above-described light emitting device 1a constitutes a red light source that emits a red color indicated by the chromaticity point R1 in the xy chromaticity diagram, and the light emitting device 1b includes the xy chromaticity. In the drawing, a green light source that emits green light indicated by a chromaticity point G1 is configured, and the light emitting device 1c emits blue light indicated by a chromaticity point B1 in the xy chromaticity diagram. The color (white light in this embodiment) within the range of a triangle formed by connecting the chromaticity points R1, B1, and G1 with a broken line can be obtained.

  Further, in the LED lighting device of the present embodiment, two light emitting devices 1a, one light emitting device 1b, and one light emitting device 1c are conductors that serve as power supply paths to the respective light emitting devices 1a, 1a, 1b, 1c. The circuit board 2 having a pattern is mounted on one surface side. In addition, although the circuit board 2 is formed in the rectangular plate shape, it is not restricted to a rectangular plate shape, For example, you may be formed in disk shape.

  Each light emitting device 1a, 1b, 1c includes LED chips (excitation light sources) 11a, 11b, 11c, rectangular plate-like mounting boards 12a, 12b, 12c on which the LED chips 11a, 11b, 11c are mounted, and LED chips. The LED chips 11a, 11b, and 11c are formed on a mounting substrate 12a formed of a light-transmitting material (for example, glass, silicone resin, etc.) containing a phosphor that is excited by light emitted from the light 11a, 11b, and 11c. , 12b, 12c are provided with dome-shaped color conversion members 13a, 13b, 13c disposed in a surrounding manner. Here, the color conversion member 13a employs a red phosphor that emits red light as the phosphor, the color conversion member 13b employs a green phosphor that emits green light as the phosphor, and the color conversion member 13c includes A blue phosphor that emits blue light is used as the phosphor. In the present embodiment, each of the color conversion members 13a, 13b, and 13c constitutes a color conversion unit. In the present embodiment, ceramic substrates are used as the mounting substrates 12a, 12b, and 12c, but the present invention is not limited to ceramic substrates.

  The light emitting devices 1a, 1b, and 1c are sealed with a light-transmitting sealing material (for example, silicone resin) that seals the LED chips 11a, 11b, and 11c inside the color conversion members 13a, 13b, and 13c. A stop (not shown) is provided. Here, radiation from each of the LED chips 11a, 11b, and 11c is obtained by including a light diffusing material (for example, glass beads) such as glass beads in the sealing portion of each of the light emitting devices 1a, 1b, and 1c. Since the light is reflected and mixed by the light diffusing material in the sealing portion, the color mixing property can be improved. Note that since the phosphor concentrations of the color conversion members 13a, 13b, and 13c are different between the red light source, the green light source, and the blue light source, for example, when a blue LED chip is used as the LED chips 11a, 11b, and 11c, the phosphor In a light source having a low density (particularly a blue light source), the blue color from the blue LED chip and the light color from the phosphor are not likely to be mixed. Therefore, a diffusing material may be mixed in the color conversion members 13a, 13b, and 13c. Each of the light emitting devices 1a, 1b, and 1c in the present embodiment has a package that includes the mounting substrates 12a, 12b, and 12c, the color conversion members 13a, 13b, and 13c, and a sealing portion. .

  By the way, in LED lighting device of this embodiment, the purple LED chip of the same specification (the composition of a light emitting layer, the light emission peak wavelength, and a structure is the same) is used as each LED chip 11a, 11b, 11c, The emission peak wavelengths of the chips 11a, 11b, and 11c are shorter than the emission peak wavelengths of the respective phosphors. The LED chips 11a, 11b, and 11c may use ultraviolet LED chips having the same specifications as long as the emission peak wavelengths are shorter than the emission peak wavelengths of the respective phosphors, or blue having the same specifications. An LED chip may be used.

  In the LED lighting device according to the present embodiment described above, the two chromaticity points W1 and W2 defined on the black body locus BL in the xy chromaticity diagram and the black body locus BL at each of the two chromaticity points W1 and W2 are described. Of the chromaticity points R1, B1, G1 corresponding to the respective vertices of the triangle including the triangle connecting the three chromaticity points W1, W2, C with the chromaticity point C located at the intersection of the two tangents that are in contact with Three types of light emitting devices 1a, 1b, and 1c that emit colors are provided. Each of the light emitting devices 1a, 1b, and 1c includes a purple LED chip in common as the LED chips 11a, 11b, and 11c, and color conversion members 13a, 13b, and Since the light emission color of 13c is made different, it is possible to suppress the color shift due to the surrounding environment and the passage of time, and all the light emitting devices 1a, 1b, 1c need only be lighted, so that the circuit structure for lighting is used. It is simple, it is possible to improve color reproducibility and color mixing property with a simple configuration without performing a feedback control. In manufacturing the LED lighting device of the present embodiment, LED chips having the same specifications are prepared for all the light emitting devices 1a, 1b, and 1c, and the color conversion members 13a and 13b that are different for the light emitting devices 1a, 1b, and 1c are prepared. , 13c, the light emitting devices 1a, 1b, 1c can be easily manufactured, and an LED lighting device capable of suppressing the occurrence of color misregistration can be easily manufactured.

  In the LED lighting device of the present embodiment, the color conversion member 13a of the light emitting device 1a contains only a red phosphor as the phosphor, and the color conversion member 13b of the light emitting device 1b contains only the green phosphor as the phosphor. Since the color conversion member 13c of the light emitting device 1c contains only the blue phosphor as the phosphor, a part of the green light emitted from the green phosphor is secondarily absorbed by the red phosphor and red. Conversion to light can be suppressed, and the luminous efficiency of the phosphor can be improved.

  By the way, the chromaticity point G1 of the light emitting device 1b as the green light source is a curve between the chromaticity points W1 and W2 on the black body locus BL and the chromaticity in the xy chromaticity diagram shown in FIG. It is set within a region surrounded by a straight line between the points W2 and P2, a curve between the chromaticity points P2 and P1 on the spectrum locus SL, and a straight line between the chromaticity points P1 and W1, and serves as a red light source. The chromaticity point R1 of the light emitting device 1a is a straight line connecting the straight line between the chromaticity points W1 and P3 and both ends of the spectral locus SL (the long wavelength end and the short wavelength end of the spectral locus SL) in the xy chromaticity diagram. Between the chromaticity point P3 and the long wavelength end of the spectral locus SL, a line between the long wavelength end of the spectral locus SL and the chromaticity point Q1 on the spectral locus SL, and between the chromaticity points Q1 and W1. And a chromaticity point B1 of the light emitting device 1c as a blue light source. In the xy chromaticity diagram, a straight line between the chromaticity points W2 and P4, a straight line connecting the chromaticity point P4 on the straight line connecting both ends of the spectral locus SL, and the short wavelength end of the spectral locus SL, and the spectral locus SL It is desirable to set within a region surrounded by a line between the short wavelength end of the light source and the chromaticity point Q2 and a straight line between the chromaticity points Q2 and W2. Here, in the xy chromaticity diagram of FIG. 1 (b), the intersection of the straight line parallel to the bisector of the angle corresponding to the chromaticity point C through the chromaticity point W1 and the spectral locus SL is P1, and the color An intersection point between a straight line passing through the chromaticity point W1 and parallel to the bisector of the angle corresponding to the chromaticity point C and a straight line connecting both ends of the spectrum locus SL is P3, and passes through the chromaticity point W2 to the bisector. The intersection of the parallel straight line and the spectral locus SL is P2, and the intersection of the straight line passing through the chromaticity point W2 and parallel to the bisector and the straight line connecting both ends of the spectral locus SL is P4, and the chromaticity point W1 The intersections of the straight line connecting the chromaticity point W2 and the spectrum locus SL are Q1 and Q2, and by setting the chromaticity points G1, R1 and B1 in the respective areas, the color reproducibility can be further improved. it can.

  Further, the color conversion members 13a, 13b, and 13c of the respective light emitting devices 1a, 1b, and 1c contain a plurality of common types (for example, two types) of phosphors (for example, a red phosphor and a green phosphor), and If the mixing ratio of the plurality of types of phosphors is changed as shown in Table 1 below, for example, the phosphors used in the light emitting devices 1a, 1b, and 1c are the same. Therefore, the fluorescence in each of the light emitting devices 1a, 1b, and 1c is the same. The initial characteristics and temporal change characteristics of the body are substantially the same, color shift due to the surrounding environment and time can be further suppressed, and color reproducibility can be further improved. However, the mixing ratio and concentration of the plurality of types of phosphors are not particularly limited.

  The plurality of types of phosphors described above are not limited to two types, and may be three or more types. For example, a phosphor that emits yellow-green light, a phosphor that emits yellow light, and a phosphor that emits orange light. There may be three types or three types of green phosphor and two types of red phosphors having different emission spectra.

  Further, in order to be able to change the color temperature on the black body locus BL, the color temperatures and the light emitting devices 1a, 1b, 1c as shown in “a”, “b”, “c” in FIG. A control device is provided for controlling a lighting circuit (driving circuit) for lighting each of the light emitting devices 1a, 1b, and 1c, and measuring a relationship with a current value of a driving current to the microcomputer. A table in which the color temperature is associated with the current ratio of each light emitting device 1a, 1b, 1c is stored in the storage unit, and each light emitting device 1a, 1b, If the current value of the drive current to 1c is controlled, the color temperature can be adjusted on the black body locus BL. In FIG. 2, “I” indicates the relationship between the color temperature and current value of the light-emitting device 1 a as a red light source, and “B” indicates the relationship between the color temperature and current value of the light-emitting device 1 b as a green light source. “C” indicates the relationship between the color temperature and the current value of the light emitting device 1c as a blue light source.

  In relation to the color temperature and illuminance, a phenomenon called the Kruzov effect is widely known as a psychological effect of light on humans. As shown in FIG. 3, the range of illuminance that humans feel comfortable with color temperature. Therefore, even if the color temperature is changed, the illuminance should be within the comfortable range described above, and if the illuminance is adjusted to increase as the color temperature is increased, the person will be able to change the color temperature. It is possible to obtain light that feels comfortable.

  On the other hand, generally the feeling of brightness (the impression of brightness when a person sees the entire illuminated room) feels darker as the color temperature is lower, even at the same illuminance. Therefore, if the total luminous flux is adjusted so that the illuminance is higher as the color temperature is lower, a substantially constant brightness feeling can be given.

  In this embodiment, in the xy chromaticity diagram of FIG. 1B, the polygon is a triangle indicated by a broken line. However, the polygon is not limited to a triangle, and may be a polygon, for example, a pentagon indicated by a solid line. But you can. Alternatively, a diffusion panel formed of a diffusion transmissive material may be disposed so as to face the circuit board 2 and light emitted from each light emitting device 1a, 1b, 1c may be mixed by the diffusion panel. Further, instead of mounting each light emitting device 1a, 1b, 1c on the circuit board 2, for example, it is mounted on a base member such as a fixture body formed of a material having high thermal conductivity (such as metal) in a lighting fixture, A circuit board in which a plurality of window holes for exposing a part or all of each of the light emitting devices 1a, 1b, and 1c may be disposed to face the base member.

(Embodiment 2)
By the way, in the LED lighting device of Embodiment 1, each of the light emitting devices 1a, 1b, and 1c has a package that includes the mounting substrates 12a, 12b, and 12c, the color conversion members 13a, 13b, and 13c, and the sealing portion. Since the packages of the light emitting devices 1a, 1b, and 1c having different emission colors are arranged on the circuit board 2 apart from each other, the irradiated surface of the light emitted from the LED lighting device and the irradiated surface When a shadow of an object existing between the LED illumination device is generated, color separation of the light emission colors of the plurality of types of light emitting devices 1a, 1b, and 1c occurs around the shadow of the object, and the periphery of the shadow on the irradiated surface Color unevenness occurs. The color separation described above is more likely to occur as the distance between the light emitting devices 1a, 1b, and 1c having different emission colors increases, and the distance between the object and the irradiated surface increases.

  On the other hand, as shown in FIG. 4, the LED illumination device of the present embodiment has the color conversion members 13 a, 13 b, and 13 c that are color conversion portions in the light emitting devices 1 a, 1 b, and 1 c in a layered shape, and the LED chip 11 a. 11b, 11c, and the respective light emitting devices 1a, 1b, 1c are constituted only by LED chips 11a, 11b, 11c and color conversion members 13a, 13b, 13c, and a plurality of types of light emitting devices 1a, 1b. , 1c are arranged close to each other in one package PG. In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 1, and description is abbreviate | omitted.

  The package PG in the present embodiment includes a single mounting substrate 12 on which a plurality of types of light emitting devices 1a, 1b, and 1c are mounted on one surface side, and a plurality of types of light emitting devices 1a, 1a, It is comprised with the one convex lens-shaped sealing part 15 which consists of a translucent sealing material (for example, silicone resin etc.) which sealed 1b and 1c. Each light emitting device 1a, 1b, 1c is made of an AlN substrate that relieves stress acting on the LED chips 11a, 11b, 11c due to a difference in linear expansion coefficient between the LED chips 11a, 11b, 11c and the mounting substrate 12. It is mounted on the mounting board 12 via the submount member 14. As the material of the submount member 14, AlN having high thermal conductivity and electrical insulation is employed, and an appropriate conductor pattern is formed on the submount member 14. The translucent sealing material is not limited to a silicone resin, and may be, for example, an epoxy resin, an acrylic resin, or glass.

  Further, as shown in FIG. 5, the LED lighting device of the present embodiment has a plurality of packages PG mounted on a disk-shaped base substrate 20 made of a heat conductive material (for example, Al, Cu, etc.). There is a feature. Here, two electric wire insertion holes 21 and 21 through which electric wires (lead wires) for feeding power to the respective packages PG are passed through the base substrate 20 in the thickness direction. Note that the shape of the base substrate 20 is not limited to a disk shape, and may be, for example, a rectangular plate shape.

  The above-mentioned one surface of the base substrate 20 is formed on the above-mentioned base substrate 20 with a light-transmitting material (for example, acrylic resin, polycarbonate resin, glass, etc.) and each package PG is accommodated between the base substrate 20. Two screw insertion holes 22 and 22 for inserting a fixing screw (not shown) for fixing a cover member (not shown) arranged on the side are formed, and the base member 20 is formed in the cover member. Two boss portions having screw holes into which the distal end portions of the fixing screws inserted into the screw insertion holes 22 and 22 of the base substrate 20 are screwed from the other surface side are continuously formed.

  In the LED lighting device according to the present embodiment described above, a plurality of types of light emitting devices 1a, 1b, and 1c are arranged close to each other in one package PG, and thus a plurality of types of light emitting devices 1a as in the first embodiment. , 1b, 1c can be made narrower in distance between the light emitting devices 1a, 1b, 1c than those having different packages, and the surface to be irradiated is between the surface to be irradiated and the LED lighting device. When the shadow of an existing object is generated, it is possible to suppress the occurrence of color separation of the light emission colors of the plurality of types of light emitting devices 1a, 1b, and 1c in the vicinity of the shadow of the object, as a result. It is possible to suppress the occurrence of color unevenness around the shadow of the irradiated surface.

  In addition, when a plurality of types of light emitting devices 1a, 1b, and 1c have different packages as in the first embodiment, the light distribution is controlled by the light distribution lenses having the same shape, so that substantially the same portion can be obtained. Although it is possible to irradiate and suppress the occurrence of color unevenness on the irradiated surface, a plurality of types of light emitting devices 1a, 1b, and 1c having different emission colors, such as the LED lighting device of this embodiment, can be packaged in one package. When the light from the package PG is housed in the PG and light distribution is controlled by a single light distribution lens, color unevenness is likely to occur on the irradiated surface. It is preferable to form a concavo-convex structure to diffuse and mix colors.

(Embodiment 3)
The basic configuration of the LED lighting device of the present embodiment is substantially the same as that of the second embodiment, and is different in that the light diffusing material 16 is dispersed in the sealing portion 15 as shown in FIG. In short, the LED lighting device of this embodiment is different in that the sealing portion 15 is formed of a light-transmitting material (for example, silicone resin) containing the light diffusing material 16. In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 2, and description is abbreviate | omitted.

  Therefore, in the LED lighting device of the present embodiment, since one sealing portion that seals a plurality of types of light emitting devices is formed of a light transmissive material containing a light diffusing material, each light emitting device 1a, 1b. , 1c are reflected and mixed by the light diffusing material 16 in the sealing portion 15, so that the color mixing property can be improved and the occurrence of uneven color can be suppressed.

(Embodiment 4)
By the way, when the plurality of light emitting devices 1a, 1a, 1b, and 1c are arranged close to each other in one package PG as in the second and third embodiments, the color conversion members 13a, 13a, 13b, and 13c perform the color conversion. A part of the light from the LED chips 11a, 11b, 11c, 11a, 11b, 11c, 11a, 11a, 11b other than the LED chips 11a, 11a, 11b, 11c immediately below the members 13a, 13a, 13b, 13c is color-converted. As a result, color deviation may occur in the emission colors of the light emitting devices 1a, 1a, 1b, and 1c.

  On the other hand, the basic configuration of the LED lighting device of the present embodiment is substantially the same as that of the second embodiment, and as shown in FIG. 7, each light emitting device 1a, 1a, 1b, 1c is adjacent to each other in the package PG. The difference is that a light shielding member 17 for shielding light from the light emitting devices 1a, 1a, 1b, and 1c is disposed. Here, the light-shielding member 17 has a cross shape in plan view, and is disposed on the surface of the submount member 13 so as to divide regions where the four light emitting devices 1a, 1a, 1b, and 1c are mounted. In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 2, and description is abbreviate | omitted.

  Therefore, according to the LED lighting device of the present embodiment, the light-shielding member 17 is disposed between the light-emitting devices 1a, 1a, 1b, and 1c adjacent to each other in the package PG, whereby each light-emitting device 1a, 1a, and 1b. , 1c can be prevented from irradiating light from the other light emitting devices 1a, 1b, 1c, 1a, 1a, 1c, 1a, 1a, 1b to the respective color conversion members 13a, 13a, 13b, 13c. Since each of the light emitting devices 1a, 1a, 1b, and 1c can be arranged close to each other and the color deviation of each of the light emitting devices 1a, 1a, 1b, and 1c can be prevented, each light emitting device 1a, 1a, 1b, and 1c emits light. Color accuracy can be increased.

(Embodiment 5)
The basic configuration of the LED lighting device of the present embodiment shown in FIG. 8 is substantially the same as that of the fourth embodiment, and instead of the light shielding member 17 described in the fourth embodiment, the light from each light emitting device 1a, 1a, 1b, 1c. Is different in that a reflecting member 18 that reflects light in the desired light extraction direction is arranged. In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 4, and description is abbreviate | omitted.

  The reflecting member 18 gradually decreases in width as it moves away from the submount member 13, and reflects light from the light emitting devices 1a, 1a, 1b, and 1c to the front of each light emitting device 1a, 1b, 1c, and 1d. It has become easier. The reflection member 18 is formed of a metal material having a high reflectance with respect to light from each of the light emitting devices 1a, 1b, 1c, and 1d. However, the reflection member 18 is not limited to the metal material, and is formed of, for example, an insulating material. It may be formed by coating a metal film or the like with a white resist or the like.

  Thus, according to the LED illumination device of the present embodiment, the light emitting devices 1a, 1a, 1b are arranged by arranging the reflecting member 18 between the adjacent light emitting devices 1a, 1a, 1b, 1c in the package PG. , 1c can be prevented from irradiating light from the other light emitting devices 1a, 1b, 1c, 1a, 1a, 1c, 1a, 1a, 1b to the respective color conversion members 13a, 13a, 13b, 13c. Since each of the light emitting devices 1a, 1a, 1b, and 1c can be arranged close to each other and the color deviation of each of the light emitting devices 1a, 1a, 1b, and 1c can be prevented, each light emitting device 1a, 1a, 1b, and 1c emits light. Color accuracy can be increased. Further, by using the reflecting member 18 instead of the light shielding member 17 described in the fourth embodiment, the light extraction efficiency can be improved.

(Embodiment 6)
The basic configuration of the LED lighting device of the present embodiment is substantially the same as that of the second embodiment, and as shown in FIG. 9, the light emitting devices 1a, 1a, 1b, and 1c are color conversion members 13a and 13a that are color conversion units, respectively. , 13b, and 13c are surrounded by rectangular frame bodies 19a, 19a, 19b, and 19c that surround the side surfaces of the color conversion members 13a, 13a, 13b, and 13c and reflect light from the color conversion members 13a, 13a, 13b, and 13c. . In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 2, and description is abbreviate | omitted.

  Thus, according to the LED illumination device of the present embodiment, the color conversion members 13a, 13a, 13b, and 13c of the respective light emitting devices 1a, 1a, 1b, and 1c are replaced with the other light emitting devices 1a, 1b, 1c, 1a, and 1a. , 1c, 1a, 1a, 1b can be prevented from being irradiated, and the light emitting devices 1a, 1a, 1b, 1b, 1c, 1c, 1c, Since the color shift 1c can be prevented, the accuracy of the emission color of each of the light emitting devices 1a, 1a, 1b, 1c can be increased.

(Embodiment 7)
The basic configuration of the LED illumination device of the present embodiment is substantially the same as that of the sixth embodiment, and as shown in FIG. 10, the frames 19a, 19a, 19b, 19c are separated from the LED chips 11a, 11a, 11b, 11c. The difference is that the opening area is gradually increased. In addition, the same code | symbol is attached | subjected to the component similar to Embodiment 6, and description is abbreviate | omitted.

  Therefore, in the LED illumination device of this embodiment, the loss of light incident on the frames 19a, 19a, 19b, 19c can be reduced, and the light extraction efficiency of each of the light emitting devices 1a, 1a, 1b, 1c can be reduced. Can be increased. Further, if a material having a high reflectance (for example, a metal such as Al or Ag or a white resist) is used as the material of the frames 19a, 19a, 19b, and 19c, the light extraction efficiency can be further increased. .

(A) is a schematic perspective view, (b) is an xy chromaticity diagram regarding the LED lighting device of the first embodiment. It is explanatory drawing of the other structural example same as the above. It is a relation explanatory drawing of color temperature and illuminance. The LED illuminating device of Embodiment 2 is shown, (a) is a schematic exploded perspective view, (b) is a schematic sectional drawing. It is a principal part schematic plan view of the application example same as the above. The LED lighting apparatus of Embodiment 3 is shown, (a) is a schematic exploded perspective view, (b) is a schematic sectional drawing. The LED lighting apparatus of Embodiment 4 is shown, (a) is a schematic exploded perspective view, (b) is a schematic sectional drawing. The LED lighting apparatus of Embodiment 5 is shown, (a) is a schematic exploded perspective view, (b) is a schematic sectional drawing. The LED lighting apparatus of Embodiment 6 is shown, (a) is a schematic exploded perspective view, (b) is a schematic sectional drawing. The LED lighting apparatus of Embodiment 7 is shown, (a) is a schematic exploded perspective view, (b) is a schematic sectional drawing. It is explanatory drawing of a prior art example. It is a schematic block diagram which shows another prior art example.

1a, 1b, 1c Light emitting device 2 Circuit board 11a, 11b, 11c LED chip 12 Mounting board 12a, 12b, 12c Mounting board 13a, 13b, 13c Color conversion member (color conversion part)
15 Sealing part 16 Light diffusing material 17 Light shielding member 18 Reflecting member 19a, 19b, 19c Frame PG package W1, W2, C, R1, G1, B1 Chromaticity point BL Black body locus SL Spectrum locus

Claims (7)

An LED illumination device including a plurality of types of light emitting devices having different emission colors, two chromaticity points defined on a black body locus in an xy chromaticity diagram of an XYZ color system based on desired mixed color light, In each of the two chromaticity points, the chromaticity corresponding to each vertex of a polygon that includes a triangle connecting three chromaticity points with the chromaticity point located at the intersection of two tangents in contact with the black body locus A plurality of types of the light emitting devices that emit light of a point; and the plurality of types of the light emitting devices each include an LED chip and a color conversion unit including a phosphor excited by light emitted from the LED chip. Each of the light emitting devices includes a single type of the LED chip selected from the group of a blue LED chip, an ultraviolet LED chip, and a purple LED chip, and the emission color of the color conversion unit is different. And each said light emission Location, the color conversion section are contained in common a plurality of types of phosphors as the fluorescent material, LED lighting apparatus characterized by that is with different mixing ratios of the plurality of types of phosphors. 2. The light emitting device according to claim 1, wherein the color conversion unit is arranged to overlap the LED chip, and the plurality of types of light emitting devices are arranged close to each other in one package. LED lighting device. The package includes one mounting substrate on which the plurality of types of light emitting devices are mounted on one surface side, and one sealing portion that seals the plurality of types of light emitting devices on the one surface side of the mounting substrate. The LED illumination device according to claim 2 , wherein the sealing portion is formed of a light-transmitting material containing a light diffusing material . LED lighting apparatus according to claim 2 or claim 3 Symbol mounting, characterized in that the light blocking member between the light emitting device adjacent to each other in the package is located. Claim 2 or billed to claim 3 Symbol mounting of the LED illumination apparatus, characterized in that the reflecting member is disposed between the light emitting device adjacent to each other in the package. Each said light emitting device, according to claim 2 or claim 3 Symbol mounting of the LED, characterized in that each comprises a frame body that reflects light from the color aspects of the conversion unit surrounds the entire circumference the color conversion unit Lighting device. The frame body, LED lighting device to that請 Motomeko 6 wherein characterized in that the opening area is formed gradually larger shape with increasing distance from the LED chip.

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