JP5056520B2 - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an illuminating device that can improve brightness of an irradiated surface and quality of illumination on an illuminated surface, and can reduce the number of used kinds of light-emitting diodes to two kinds. <P>SOLUTION: A substrate 23 is provided with a first light-emitting section 31, and a second light-emitting section 37 and a third light-emitting section 41, which are adjacent to the light-emitting section 31 and have a light-emitting area smaller than the first light-emitting section. The first light-emitting section 31 comprises a plurality of first blue LEDs 32 emitting blue light, a first translucent sealing member 33 sealing the blue LEDs 32 and fluorescent material mixed into the sealing member 33 and excited by blue light, and emits light in green or yellow. The second light-emitting section 37 comprises a plurality of second blue LEDs 38 emitting blue light and a second translucent sealing member 39 sealing the blue LEDs 38. The third light-emitting section 41 comprises a plurality of red LEDs 42 emitting red light and a third translucent sealing member 43 sealing the red LEDs 42. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an illumination device that performs illumination using light emitted from an LED (light emitting diode).

  Conventionally, in addition to a plurality of types of LEDs that emit a single color, that is, a blue LED, a green LED, an orange LED, and a red LED, they are excited by light emitted from an LED, for example, a blue LED or a blue-green LED, from green to yellow There is known an illumination light source that includes a phosphor that emits light of any color in the range of (1) and illuminates by mixing these lights to form white light (see, for example, Patent Document 1).

Since the emission spectrum of the phosphor is a broad broadband emission spectrum having a wide half-value width compared to the emission spectrum of monochromatic light emitted from the LED, the illumination light source of Patent Document 1 is insufficient for each LED emitting monochromatic light. The spectrum of the emission wavelength can be supplemented. Thereby, when the lighting condition of LED of each light color fluctuates, the fluctuation | variation of the luminescent color of an illumination light source can be suppressed.
Japanese Patent No. 3940750 (paragraphs 0097-0100, FIG. 12)

  FIG. 12 of Patent Document 1 merely shows the emission spectrum of each LED having a different emission color and the emission spectrum of the phosphor. For this reason, the specific configuration of the illumination light source is unknown, and naturally, the arrangement of four types of LEDs and phosphors having different emission colors and the like are also unknown.

  By the way, in the illumination light source using LED, it is possible to divide the emission colors of LEDs that emit light of different colors on the irradiated surface illuminated by the light emitted from now on, or various LEDs In other words, it is desired to improve the illumination quality on the surface to be illuminated, such as a device that makes the emission color inconspicuous even if it is separated. However, it is unclear whether this can be realized with the illumination light source of Patent Document 1.

  Furthermore, illuminating the illuminated surface with the necessary brightness is also desired for illumination light sources using LEDs. However, as described above, it is unclear whether the illumination light source in which the emission colors of the phosphors are added to the emission colors of the four types of LEDs is suitable for increasing the brightness of the irradiated surface.

  Further, as described above, the illumination light source disclosed in Patent Document 1 uses four types of LEDs that emit light in a single color with different emission wavelengths (emission colors). By the way, various LEDs having different emission wavelengths have different emission characteristics and lifetime characteristics depending on temperature conditions due to the types of semiconductor materials for obtaining the emission wavelengths. Therefore, in order to produce a desired light color such as white light, the variation in the light color due to the difference in light emission characteristics and lifetime characteristics becomes more obvious as the number of colors to be mixed increases and the illumination light source has a large number of peak wavelengths. Therefore, it is difficult to stably emit light of a desired light color (white or the like) under various conditions. Therefore, from a practical point of view, it is desired to reduce the types of LEDs used for producing a desired light color such as white light, but such a request cannot be satisfied by the illumination light source of Patent Document 1.

  The objective of this invention is providing the illuminating device which can improve the brightness of the to-be-illuminated surface, and the illumination quality in an to-be-illuminated surface, and can reduce the number of the use types of a light emitting diode to two types.

The invention of claim 1 is a substrate; a first light-emitting portion provided on the substrate, a plurality of first blue light-emitting diodes emitting blue light, and a light-transmitting material encapsulating the blue light-emitting diodes A first sealing member, and a first light emitting unit that emits green light or yellow light having a phosphor mixed with the sealing member and excited by the blue light; and the first light emitting unit. A plurality of second blue light emitting diodes that emit blue light, and a second blue light emitting diode that is provided on the substrate adjacent to the light emitting area and has a light emitting area smaller than that of the first light emitting section. A second light-emitting part having a light-transmitting second sealing member encapsulating the light-emitting diode; and provided on the substrate adjacent to the first light-emitting part and from the first light-emitting part Is a third light-emitting part with a small light-emitting area, which emits red light And defining a plurality of regions in which the respective light emitting portions are provided; a plurality of red light-emitting diode, and the third light emitting portion having a third sealing member sealed translucent and these red light emitting diodes And a partition provided between the light emitting portions .

  In the first aspect of the present invention, the second and third light emitting sections are arranged in the form in which the second and third light emitting sections are adjacent to the first light emitting section, as in the second aspect of the present invention. The aspect arrange | positioned so that the 1st light emission part may be pinched | interposed is included. In the invention of claim 1, the first light emitting section emits at least one of yellow light and green light. When the first light emitting unit emits both yellow light and green light, a phosphor that emits green light and a phosphor that emits yellow light may be mixed. However, since it is less likely to cause color unevenness due to uneven mixing of phosphors than in this case, the yellow light emitting region emitting yellow light and the longitudinal central portion of the yellow light emitting region are provided as in the invention of claim 3. It is preferably divided into a green light emitting region that continuously emits green light so as to protrude. When the first light emitting unit has a yellow light emitting region and a green light emitting region, and the emphasis is on the brightness (increased luminous flux) of the irradiated surface, the yellow light emitting region is changed from the green light emitting region. What is necessary is just to enlarge, and when the color rendering property of a to-be-irradiated surface is considered as important, what is necessary is just to make a green light emission area | region into the magnitude | size more than the yellow light emission area.

  The lighting device according to any one of claims 1 to 3 includes green light or yellow light obtained by a phosphor excited by blue light emitted from the first blue light emitting diode, and blue light emitted from the second blue light emitting diode. And the red light emitted from the red light emitting diode is mixed to form white light, and the irradiated surface can be illuminated with the white light.

  In the first light emitting unit, the phosphor excited by the blue light emits the blue light monochromatic light of the blue light emitting diode in the second light emitting unit and the red light of the red light emitting diode in the third light emitting unit. More efficient than monochromatic light emission. The emission spectrum of the phosphor of the first light emitting part is a broad broadband emission spectrum having a wide half-value width compared to the emission spectrum of the blue and red light emitting diodes. The emission intensity in the wavelength band between the light wavelength band and the red light wavelength band can be supplemented. At the same time, green light or yellow light has high specific visual sensitivity and can also contribute to improvement in color rendering. In addition, the light emitting area of the first light emitting unit having the phosphor is larger than the light emitting areas of the second and third light emitting units. Therefore, the brightness and color rendering of the irradiated surface can be improved.

  Further, as described above, since the second and third light emitting units are provided adjacent to the first light emitting unit having a larger light emitting area, each of the blue light and the red light is mainly used for illumination. It is easy to mix with high-efficiency green light or yellow light. Therefore, it is possible to suppress the emission color of each light emitting unit that emits different colors on the irradiated surface from becoming mottled, thereby improving the illumination quality of the illuminated surface.

  In addition, the illumination device according to claims 1 to 3 illuminates with the white light formed as described above, and there are two types of light emitting diodes used for obtaining the white light: a blue light emitting diode and a red light emitting diode. Only type. Accordingly, variations in light emission due to light emission characteristics and lifetime characteristics are suppressed, and stable white light can be emitted for illumination. In addition, since there are two types of light emitting diodes to be used, the adjustment can be easily performed in accordance with the minimum adjustment target when changing the correlated color temperature of the white light.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the number of the first blue light emitting diodes arranged in the yellow light emitting region per unit area is such that the green light emitting region and the second, third, The number of light emitting diodes arranged in each of the light emitting portions is smaller than the number of arranged per unit area.

  The heat generated by each light emitting diode during lighting of the lighting device is conducted to the substrate on which the light emitting diode is provided, and is released from the back side of the substrate. By the way, the phosphor mixed with the first sealing member sealing the first blue light emitting diode arranged in the yellow light emitting region of the first light emitting part generates heat as it is excited. As a result, the temperature of the first blue light emitting diode is likely to rise due to the heat generated by the phosphor.

  Nevertheless, in the invention of claim 4, the arrangement density of the first blue light emitting diodes arranged in the yellow light emitting region is coarser than the arrangement density of the light emitting diodes in other positions. The thermal diffusion area around the plurality of first blue light emitting diodes arranged can be increased. For this reason, in the heat conduction from the plurality of first blue light emitting diodes arranged in the yellow light emitting region to the substrate, heat radiation from the first blue light emitting diodes adjacent to each other to the substrate becomes difficult to interfere with the substrate. The heat conduction (heat dissipation) becomes better. Therefore, as the decrease in light emission efficiency due to excessive temperature rise of the plurality of first blue light emitting diodes arranged in the yellow light emitting region is suppressed, the light in the wavelength band that contributes to the improvement of the brightness of the irradiated surface, It is possible to continuously emit light in the yellow light emitting region of the first light emitting unit.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the light emitting area of the first to third light emitting units is in accordance with a luminous flux ratio of each color emitted by each of the light emitting units. It is characterized by a large area ratio.

  In the fifth aspect of the present invention, since the maximum value of the luminance of the light of each color emitted from the first to third light emitting units is the same, the luminance unevenness in the first to third light emitting units can be suppressed. For this reason, it is suppressed that the luminescent color of the 1st-3rd light emission part becomes mottled on a to-be-irradiated surface, and the illumination quality of an to-be-illuminated surface can be improved.

  The invention of claim 6 is the invention according to any one of claims 3 to 5, wherein the emission wavelength of the green emission region has a peak wavelength between 495 and 535 nm, and the emission wavelength of the yellow emission region. Has a peak wavelength between 550 and 600 nm, the emission wavelength of the blue light emitting diode has a peak wavelength between 435 and 475 nm, and the emission wavelength of the red light emitting diode has a peak wavelength of 610 nm or more. It is a feature.

  In the invention of claim 6, it is possible to illuminate by using two types of light emitting diodes to emit blue light, red light, yellow light, and red light, and to form white light by a mixed light thereof. .

  According to a seventh aspect of the present invention, there is provided the control device according to any one of the first to sixth aspects, wherein the control device adjusts the light emission intensity of each of the first and second blue light emitting diodes and the red light emitting diode. It is characterized by that.

  In the seventh aspect of the present invention, the correlated color temperature of the light color obtained by mixing the light emitted from the first to third light emitting units is changed by adjusting the light emission intensity of each light emitting diode by the control device. Can do.

  According to the illumination device of the invention according to claims 1 to 3, the brightness of the illuminated surface and the illumination quality on the illuminated surface can be improved, and the number of types of light emitting diodes used can be reduced to two.

  According to the illuminating device of the invention according to claim 4, in the invention of claim 3, since the heat radiation from each first blue light emitting diode arranged in the yellow light emitting region to the substrate is good, the irradiated surface The light in the wavelength band that effectively contributes to the improvement of the brightness of the first light emitting section can be continuously emitted in the yellow light emitting region.

  According to the illuminating device of the invention according to claim 5, in the invention of any one of claims 1 to 4, the surface to be illuminated is further suppressed by suppressing uneven brightness in the first to third light emitting portions. Can improve the lighting quality.

  According to the illuminating device of the invention of claim 6, in the invention of any one of claims 3 to 5, further using two kinds of light emitting diodes, blue light, red light, yellow light, and Red light can be emitted, and white light can be formed by the mixed light to illuminate.

  According to the illuminating device of the invention of claim 7, in the invention of any one of claims 1 to 6, the light obtained by further mixing the light emitted from the first to third light emitting units The correlated color temperature of the color can be changed.

  A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1A is a side view of a hanging type illumination device 2 that is installed suspended from a ceiling 1 that is an installation target. The lighting device 2 includes a pendant base 3, a lamp 4, and a hanging member such as a chain 5. In addition, the code | symbol 6 in FIG. 1 (A) has shown the power cord which connected the pendant base 3 and the lamp | ramp 4 electrically.

  The pendant base 3 is fixed to the ceiling 1 and has a built-in control device 7 for lighting and dimming. The control device 7 performs lighting, dimming, and the like of the lamp 4 with a command by wireless transmission from a remote controller (not shown) or a command by manual operation of an operation unit provided on a wall switch (not shown).

As shown in FIG. 2, the lamp 4 is provided with a plurality of second LED modules 22 as a plurality of first LED modules 21 as a light-emitting device on a metal lamp body 11 constituting the apparatus body. A translucent light control body 19 that covers one LED module 21 and a translucent cover 20 that covers the second LED module 22 are attached. The LED modules 21 and 22 and the control device 7 are electrically connected via the power cord 6.

  The lamp body 11 is, for example, an integrally formed product of aluminum or an alloy thereof. As shown in FIG. 1 (B) to FIG. 1 (D), the lamp body 11 has a circular shape when viewed from the front and back, and a body base portion 12 that opens downward as shown in FIG. It has a main body peripheral portion 13 which is integrally provided so as to surround the periphery and opens upward, and a heat sink 14 for heat dissipation formed on the back surface of the main body base portion 12.

  As shown in FIG. 2, the plurality of first LED modules 21 are mounted so as to project light downward on a wall portion 12 a formed on the back surface of the heat sink 14 of the main body base portion 12 in order to bear downward illumination. Yes. The arrangement of these first LED modules 21 is shown in FIG. 1 (D), one at the center of the wall 12a, seven at equal intervals in the circumferential direction, and further in the circumferential direction near the main body circumferential portion 13. Eight are arranged at regular intervals.

  The light control body 19 is disposed so as to fit into the lower surface opening of the main body base portion 12. The light control body 19 is made of a diffuse translucent material such as milky white synthetic resin in order to reduce glare of the first LED module 21, and as shown in FIG. 1C and FIG. For example, a hole 19a is provided at the center.

  As shown in FIG. 2, the plurality of second LED modules 22 are attached to the peripheral portion 13 of the main body so as to project light upward in order to perform upward illumination on the ceiling side. The arrangement of these second LED modules 22 is shown in FIG. 1 (B), and, for example, eight pieces are arranged at equal intervals in the circumferential direction of the main body peripheral portion 13.

  The cover 20 is made of a transparent resin plate or the like. The same number of covers 20 as the second LED modules 22 are prepared. As shown in FIGS. 1B and 2, these covers 20 cover the second LED modules 22 individually from above and are attached to the peripheral portion 13 of the main body. It has been.

  The first LED module 21 and the second LED module 22 have the same configuration. Hereinafter, the first LED module 21 will be described as a representative with reference to FIGS.

  The first LED module 21 includes a substrate 23, a partition 28, a first light emitting unit 31, a second light emitting unit 37, and a third light emitting unit 41.

  The substrate 23 is made of an electrical insulator such as ceramic or synthetic resin, and has rectangular recesses 23a each having a size of 30 mm in length and width, for example, as shown in FIGS. A thermal diffusion layer 24 is provided on the inner surface of the recess 23a (the bottom surface of the recess 23a in FIGS. 5 to 7). The thermal diffusion layer 24 is made of a metal foil such as a copper foil or a silver foil. This thermal diffusion layer 24 can be omitted when the substrate 23 is a metal base substrate, etc., in order to secure a larger heat radiation area from each LED, which will be described later, to the main body base portion 12 and to improve the heat radiation performance. It is preferable to provide it. The substrate 23 is fixed to the lamp body 11 in the above-described arrangement by a fixing component (not shown) such as a screw passing through a fixing hole 23b opened around the recess 23a.

  A partition 28 is accommodated in the recess 23a. Accordingly, the recess 23a is partitioned into a plurality of regions, and the first light emitting unit 31, the second light emitting unit 37, and the third light emitting unit 41 are provided to occupy the respective regions. The partition 28 is made of a synthetic resin or a metal plate.

  When the first light emitting unit 31 divides the rectangular recess 23a into three equal parts along the two parallel sides, the first light emitting unit 31 is divided into a rectangular region A1 at the center and a longitudinal direction of the region A1. It is provided in a region A2 projecting from the center to both sides (upper and lower sides in FIG. 4). Therefore, the first light emitting unit 31 of the present embodiment has a cross shape. The area of the area A1 is the largest among the areas partitioned by the partition 28, and the area of the area A2 is smaller than the area A1, for example, approximately 1/3.

  The first light emitting unit 31 includes a plurality of first blue light emitting diodes, a first sealing member, and a phosphor, and emits green light or yellow light.

  That is, as shown in FIGS. 4 and 5, a plurality of, for example, eight first blue light emitting diodes (hereinafter abbreviated as blue LEDs 32) are provided in the region A1, and these blue LEDs 32 are sealed. A transparent first sealing member 33 is provided, and a phosphor (not shown) is mixed with the first sealing member 33.

  As can be seen from FIG. 8, each blue LED 32 is a chip-like LED that emits light having a peak wavelength between 435 and 475 nm. These chip-like blue LEDs 32 are formed by providing a semiconductor light emitting layer that emits blue light on one surface of a light-transmitting and electrically insulating element substrate such as sapphire, and the other surface parallel to the one surface of the element substrate is illustrated. It is mounted on the substrate 23 in a predetermined arrangement by adhering to the thermal diffusion layer 24 with a die bond material that is not used. The plurality of blue LEDs 32 arranged at intervals are electrically connected in series. Therefore, the adjacent blue LEDs 32 are connected via an electrical connection element such as a bonding wire (not shown).

  The first sealing member 33 is made of a transparent silicone resin or the like, and a phosphor (not shown) is preferably uniformly dispersed and mixed therewith. As this phosphor, a yellow phosphor that is excited by blue light emitted from the blue LED 32 and emits yellow light having a wavelength different from that of the blue light is used. The emission wavelength of the yellow phosphor has a peak wavelength between 550 and 600 nm. The region A1 in which the blue LED 32 is sealed with the first sealing member 33 mixed with such a yellow phosphor is referred to as a yellow light emitting region Y in this specification, and the yellow light emitting region Y is written in parentheses. 3, FIG. 5, and FIG.

  Further, as shown in FIGS. 4 and 6, each of the pair of regions A2 is provided with a plurality of other first blue light emitting diodes (hereinafter abbreviated as blue LEDs 34), for example, four each, Other blue light-transmitting first sealing members 35 are provided by sealing these blue LEDs 34. A phosphor (not shown) is mixed in the other first sealing member 35.

  For each blue LED 34, the same chip-like blue LED as the blue LED 32 is used. These chip-like blue LEDs 34 are mounted on the substrate 23 in a predetermined arrangement by adhering to the heat diffusion layer 24 with a die bond material (not shown). The other blue LEDs 34 arranged in each of the pair of regions A2 are electrically connected in series.

  The other first sealing member 35 is made of a transparent silicone resin or the like, and a phosphor (not shown) is preferably uniformly dispersed and mixed therein. As this phosphor, a green phosphor that is excited by blue light emitted from the blue LED 34 and emits green light having a wavelength different from that of the blue light is used. The emission wavelength of the green phosphor has a peak wavelength between 495 and 535 nm. The region A2 in which the blue LED 34 is sealed by the other first sealing member 35 mixed with the green phosphor in this way is referred to as a green light emitting region G in this specification, and the green light emitting region G is written in parentheses. 3, 6, and 7, the first light emitting unit 31 is also shown.

  Therefore, the first light emitting unit 31 that occupies the cross-shaped region and is provided at the center of the substrate 23 emits yellow light having a peak wavelength of 550 to 600 nm by the yellow phosphor as can be seen from FIG. The green phosphor emits green light having a peak wavelength of 459 to 535 nm.

  The second light emitting unit 37 and the third light emitting unit 41 are disposed adjacent to each other along the first light emitting unit 31 so as to sandwich the first light emitting unit 31 around the first light emitting unit 31. Has been.

That is, as shown in FIG. 3, the second light emitting unit 37 is provided in each of the regions C (see FIG. 4) partitioned and positioned on the diagonal line of the rectangular recess 23 a, and the first light emitting unit 31. The region A1 is sandwiched diagonally. The third light emitting unit 41 is provided in each of the regions D (see FIG. 4) partitioned and positioned on the other diagonal lines of the recesses 23a orthogonal to the diagonal line, and the region A1 of the first light emitting unit 31 is provided. Is sandwiched diagonally. Therefore, the second light-emitting portion 37 and the third light-emitting portion 41 are provided so as to sandwich one end and the other end in the longitudinal direction of the yellow light-emitting region Y from above and below in FIG. In FIG. 3, it is provided so as to be sandwiched from the left and right. In other words, the pair of second light emitting units 37 and the pair of third light emitting units 41 are adjacent to each other so as to sandwich the yellow light emitting region Y and the green light emitting region G of the first light emitting unit 31. Is provided.

  The second light emitting unit 37 includes a plurality of second blue light emitting diodes (hereinafter abbreviated as blue LEDs 38) disposed in the region C, and a second sealing member 39.

  Specifically, the blue LED 38 is a chip-like blue LED that emits light having a peak wavelength between 435 and 475 nm, similar to the blue LEDs 32 and 34. These chip-like blue LEDs 38 are mounted on the substrate 23 in a predetermined arrangement by adhering to the thermal diffusion layer 24 with a die bond material (not shown). The blue LEDs 38 arranged in each of the pair of regions C are electrically connected in series. The second sealing member 39 is made of a transparent silicone resin or the like, and is not mixed with a phosphor. The region C in which the blue LED 38 is sealed by the second sealing member 39 is referred to as a blue light emitting region B in this specification, and the blue light emitting region B is written in parentheses in FIG. 3 and FIG. It is written together with the part 37.

  Similarly, the third light emitting unit 41 includes a plurality of red light emitting diodes (hereinafter abbreviated as red LEDs 42) and a third sealing member 43.

  Specifically, as shown in FIG. 8, the red LED 42 is a chip-shaped red LED that emits light having a peak wavelength of 610 nm or more. These red LEDs 42 are provided with a semiconductor light emitting layer that emits red light on one surface of a light-transmitting and electrically insulating element substrate such as sapphire, and a die bond material (not shown) on the other surface parallel to the one surface of the element substrate. By being adhered to the thermal diffusion layer 24, the substrate 23 is mounted in a predetermined arrangement. The red LEDs 42 arranged in each of the pair of regions D are electrically connected in series. The third sealing member 43 is made of a transparent silicone resin or the like, and is not mixed with a phosphor. The region D in which the red LED 42 is sealed by the third sealing member 43 is referred to as a red light emitting region R in the present specification, and the red light emitting region R is written in parentheses in FIG. 3 and FIG. It is written together with the part 41.

  In addition, the code | symbol 29 in FIG. 3 has shown the electric wire connector. The electric wire connector 29 is mounted on the substrate 23 so as to be positioned on both sides of the recess 23a so as to sandwich the light emitting portion. The adjacent 1st LED module 21 is electrically connected through the insulation coating electric wire wired between those electric wire connectors 29. FIG.

  In the first LED module 21 and the second LED module 22 configured as described above, the luminous efficiency of yellow light emitted from the yellow light emitting area Y is 72 lm / W, and the luminous efficiency of green light emitted from the green light emitting area G is 70 lm / W. The luminous efficiency of blue light emitted from the blue light emitting region B is 12 lm / W, and the luminous efficiency of red light emitted from the red light emitting region R is 25 lm / W.

  In the first LED module 21 having such light emitting regions Y, G, B, and R, the areas of the regions A2, C, and D are the same as shown in FIG. The area of A1 is large, and the area is equal to the total area of the regions A2, C, and D. Under these conditions, as described above, four blue or red LEDs are disposed in each of the regions A2, C, and D, and eight blue LEDs are disposed in the region A1. Accordingly, the number of blue LEDs 32 arranged in the yellow light emitting region Y per unit area is arranged in each of the other regions, that is, the green light emitting region G, the blue light emitting region B, and the red light emitting region R. Less than the number of LEDs arranged per unit area. Therefore, the mutual space | interval of several blue LED32 is wider than the mutual space | interval of other LED (Blue LED34, blue LED38, red LED42).

  While the lighting device 2 is lit, the control device 7 includes the blue LEDs 32 disposed in the yellow light emitting region Y, the blue LEDs 34 disposed in the green light emitting region G, the blue LEDs 38 disposed in the blue light emitting region B, and red. By controlling the input to at least one of the red LEDs 42 arranged in the light emitting region R, preferably all LEDs of the light emitting colors, the light emission intensity of the corresponding LEDs is adjusted. By this adjustment, a desired illumination environment can be obtained. At the same time, the control device 7 continuously maintains the light emission state of at least the yellow light emission region Y in the yellow light emission region Y and the green light emission region G regardless of the input adjustment (adjustment of the light emission intensity). ing.

  By turning on the first LED module 21 of the illumination device having the above-described configuration, the peak wavelength (from 570 nm as shown in FIG. 8 as an example) is 550 to 600 nm from the yellow light emitting region Y of the first LED module 21. Yellow light having a peak wavelength of 515 nm) is emitted from the green light emitting region G, and green light having a peak wavelength between 495 and 535 nm (for example, a peak wavelength of 515 nm as shown in FIG. 8) is emitted. Blue light having a peak wavelength between 435 and 475 nm (as an example, a peak wavelength of 455 nm as shown in FIG. 8) is emitted from the blue light emitting region B, and a peak wavelength of 610 nm or more (one example from the red light emitting region R). As shown in FIG. 8, red light having a peak wavelength of 630 nm is emitted.

  Therefore, these four colors of light are mixed to form white light, and the illuminated surface can be illuminated below the lighting fixture 2 with this white light.

  In this illumination, the light emitted from the second light emitting unit 37 is the blue light itself emitted from the blue LED 38, and the light emitted from the third light emitting unit 41 is also the red light itself emitted from the red LED 42. These monochromatic lights have high emission intensity but have a narrow half width, and are not suitable for obtaining the brightness of the irradiated surface.

  Nevertheless, the illuminated surface can be illuminated brightly by turning on the first LED module 21. That is, in the first light emitting unit 31, the yellow phosphor mixed in the first sealing member 33 is excited by the blue light emitted from the blue LED 32 to emit yellow light, and the blue light emitted from the blue LED 34 is emitted. The green phosphor mixed with the other first sealing member 35 is excited to emit green light.

Light emission by these yellow phosphors and green phosphors is more efficient than the light emission of the blue LED 38 in the second light emitting unit 37 and the light emission of the red LED 42 in the third light emitting unit 41. As shown in FIG. 8, the emission spectrum of the yellow phosphor and the green phosphor is a broad broadband emission spectrum having a wide half-value width compared to the emission spectra of the blue LED 38 and the red LED 42. The light emission in the wavelength band between the blue light wavelength band and the red light wavelength band can be supplemented by the light emission from the green phosphor. At the same time, light with a wavelength of 495 to 600 nm (green light or yellow light) emitted from the first light emitting unit 31 has high specific visual sensitivity and can contribute to improvement in color rendering. In addition, the light emitting area of the first light emitting unit 31 is larger than the light emitting areas of the second light emitting unit 37 and the third light emitting unit 41, respectively. Therefore, the brightness and color rendering of the irradiated surface can be improved.

  Furthermore, according to the configuration of the first LED module 21, the second light emitting unit 37 and the third light emitting unit 41 have a light emitting area larger than these, and among the light emitting units of the first LED module 21. It is provided adjacent to the first light emitting unit 31 having the largest light emitting area. For this reason, each of blue light and red light is likely to be mixed with high-efficiency green light or yellow light, which is the main subject of illumination as described above, and the illumination quality of the illuminated surface can be improved. That is, the emission colors of the first to third light emitting units that emit different colors from each other are separated from the irradiated surface, and the irradiated surface is suppressed from being mottled.

  In addition, since the yellow light emitting region Y of the first light emitting unit 31 that mainly ensures the brightness of the irradiated surface has a larger area than the other light emitting regions, the rate of variation in the amount of yellow phosphor is reduced, which is based on this variation. The color shift is suppressed and a predetermined light color can be obtained. Incidentally, in the manufacturing process, when the green phosphor using the sealing member as a solvent is applied to the region A2 by potting to form the green light emitting region G of the first light emitting unit 31, the region A2 is small. Since the total amount of the green phosphor applied by potting is small, the ratio of the green phosphor to vary increases and the color shift (color shift) with respect to a predetermined color increases. Therefore, as described above, as the area of the yellow light emitting region Y is larger than that of the other light emitting regions, the influence of variation in the amount of yellow phosphor applied is reduced accordingly, and color shift can be suppressed. is there.

  In the above illumination, as described above, illumination is performed with white light formed by four colors of light. The types of light-emitting diodes used to obtain the white light are blue LEDs 32, 34, and 38 and red LED 42. Only type. Therefore, variation in light emission due to light emission characteristics and lifetime characteristics is suppressed, and stable white light can be emitted for illumination. In addition, since there are two types of light emitting diodes to be used, the adjustment can be easily performed in accordance with the minimum adjustment target when changing the correlated color temperature of the white light.

  Further, the heat generated by the LEDs 32, 34, 38, 42 in the lighting state is mainly diffused in the heat diffusion layer 24, and the main body base portion 12 of the lamp main body 11 has an area corresponding to the size of the heat diffusion layer 24. And is further discharged from the heat sink 14 to the outside.

  By the way, in the yellow light emitting region Y of the first light emitting unit 31 responsible for the main light emission of the first LED module 21, the yellow phosphor mixed in the first sealing member 33 is excited in the lighting state of the lighting device. As a result, the blue LED 32 of the first light emitting unit 31 is affected by the blue LED 38 and the red LED 42 covered with the second and third sealing members 39 and 43 that are not mixed with the phosphor. It is in a condition where the temperature is likely to rise.

  However, as described above, the number of blue LEDs 32 arranged in the yellow light emitting region Y per unit area is arranged in the blue LEDs 38 arranged in the second light emitting unit 37 and the third light emitting unit 41. The number of red LEDs 42 is smaller than the number of units arranged per unit area. In other words, the arrangement density of the blue LEDs 32 arranged in the yellow light emitting area Y is coarser than the arrangement density of the LEDs in other positions, and the heat diffusion area around each blue LED 32 arranged in the yellow light emitting area Y is Has been increased. For this reason, in the heat conduction from each blue LED 32 arranged in the yellow light emitting region Y to the substrate 23, the heat radiation from the blue LEDs 32 adjacent to each other hardly interferes, and the heat conduction to the substrate 23 becomes good. . In addition, heat radiation from the surface of the yellow light emitting region Y having a large area can be expected. Therefore, as the decrease in light emission efficiency due to excessive temperature rise of each blue LED 32 arranged in the yellow light emitting region Y is suppressed, the light in the wavelength band that contributes to the improvement of the brightness of the irradiated surface is emitted as the first light emission. The yellow light emission region Y of the part 31 can continuously emit light.

  Moreover, the lighting fixture 2 having the above-described configuration can adjust the light emission intensity of the light emitted by the LEDs included in each light emitting region by controlling the control device 7 of the lighting device by wire or wirelessly, The correlated color temperature of the light color obtained by mixing the light emitted from the first to third light emitting units 31, 37, 41 can be changed. For example, when the lighting environment has a cool light color and a refreshing atmosphere, the emission intensity of the blue LED 38 may be increased. When the lighting environment has a calm atmosphere with a warm light color, the red LED 42 emits light. You only need to increase the strength.

  There are a plurality of luminous flux ratios for obtaining the target light color by mixing the four emission colors, and by appropriately mixing the respective emission colors, the luminous flux ratio that maximizes Ra (average color rendering index), It is possible to obtain a light flux ratio range of Ra90 or higher or Ra80 or higher.

For example, the case where the four emission colors having the spectral distribution as shown in FIG. 8 are mixed will be described. As described above, the peak wavelength of each light color is 455 nm for blue light, 515 nm for green light, 570 nm for yellow light, and 630 nm for red light. When light colors having correlated color temperatures of 2800K, 5000K, and 6500K are produced by mixed light, the luminous flux ratio for obtaining Ra95 is shown in Table 1, and the spectral distributions at this luminous flux ratio are shown in FIGS. 9 is a diagram showing the spectral distribution when the correlated color temperature is 2800K and becomes Ra96, FIG. 10 is a diagram showing the spectral distribution when the correlated color temperature is 5000K and becomes Ra96, and FIG. 11 is a diagram showing the Ra96 and the correlated color temperature 6500K. The figure which shows the spectral distribution at this time is shown.

  The luminous efficiencies when mixed with the light flux ratios in Table 1 exceeded 52 lm / W, realizing high color rendering and high efficiency.

Next, Table 2 shows the range of the luminous flux ratio for obtaining Ra90 or higher, and Table 3 shows the range of the luminous flux ratio for obtaining Ra80 or higher. These luminous flux ratio ranges indicate the luminous flux ratio values that are Ra90 or higher or Ra80 or higher when, for example, light colors having correlated color temperatures of 2800K, 5000K, and 6500K are produced.

  FIG. 12 shows, as an example, the luminous flux ratio of each light color, Ra at that time, and light emission efficiency for five types of mixed light patterns when obtaining a light color of 5000K. The mixed light pattern is a case where Ra is 83, 90, 97, 90, 80 from left to right in FIG. 12, and represents a change in the light flux ratio and the light emission efficiency at that time.

  From FIG. 12, it can be seen that green light and red light decrease as yellow light increases, but blue light hardly changes. Therefore, the range of the light flux ratio of each light color for obtaining the target Ra can be obtained. Furthermore, it can be seen from FIG. 12 that the efficiency (lm / W) as the lighting device is improved with the increase in yellow light, and therefore a desirable combination of Ra and efficiency can be obtained from FIG. it can. The calculated yellow light emission efficiency was 71.3 lm / W, and the green light emission efficiency was 70.3 lm / W.

Table 4 shows the luminous flux ratio when only the correlated color temperature is changed with the same brightness.

  As can be seen from Table 4, Ra exceeds 90, and by mixing at such a luminous flux ratio, the correlated color temperature is changed with the same brightness while obtaining light with high color rendering properties. Can do.

  As described above, blue light and red light, which are the emission colors of LEDs, and yellow light and green light, which are emission colors of the phosphor, are mixed by adjusting their emission intensities, so that the luminous flux according to the mixing condition. According to the ratio, the emission color of the first LED module 21 can be set to Ra80 or higher, and thereby, the color rendering property equivalent to or higher than the color rendering property group 1B (80 ≦ Ra <90) referred to in the CIE color rendering property classification is obtained. be able to.

  Similarly, by adjusting and mixing the light emission intensities of the four colors, the light emission color of the first LED module 21 can be set to Ra 90 or more by the luminous flux ratio corresponding to the mixing condition. Since the color rendering properties of the color rendering property group 1A (Ra ≧ 90) referred to in the CIE color rendering properties classification can be obtained, the lighting device can be sufficiently used for applications that require strict color rendering properties. The

  A second embodiment of the present invention will be described with reference to FIG. Since the second embodiment is the same as the first embodiment except for the matters described below, including the configuration not shown in FIG. 13, the same reference numerals as those in the first embodiment are given to the same configurations as the first embodiment. The description is omitted.

  As already described in the first embodiment, the luminous efficiency of yellow light emitted from the yellow light emitting area Y of the first LED module 21 is 72 lm / W, the luminous efficiency of green light emitted from the green light emitting area G is 70 lm / W, blue The luminous efficiency of blue light emitted from the light emitting region B is 12 lm / W, and the luminous efficiency of red light emitted from the red light emitting region R is 25 lm / W.

  Each of these light emitting areas Y, G, B, and R has an area ratio corresponding to their luminous flux. Specifically, as shown in FIG. 13, the yellow light emitting region Y has the largest area, the green light emitting region G has the next largest area, the blue light emitting region B has the smallest area, and the red light emitting region R has the smallest area. Is smaller than the area of the green light emitting region G and larger than the area of the blue light emitting region B. Therefore, the yellow light emitting region Y and the green light emitting region G having the phosphor are larger than the blue light emitting region B and the red light emitting region R having no phosphor. With such setting of the light emitting area ratio, the maximum light amount of yellow light emitted from the yellow light emitting region Y is 110 lm, the maximum light amount of green light emitted from the green light emitting region G is 106 lm, and the maximum light amount of blue light emitted from the blue light emitting region B is The maximum amount of red light emitted from the red light emitting region R is 20 lm and 27 lm.

  The configuration of the second embodiment other than that described above is the same as that of the first embodiment. Therefore, the problem of the present invention can be solved also in the second embodiment for the reason already described in the first embodiment. Moreover, the second embodiment is superior to the first embodiment in the following points.

  That is, as described above, the light emitting areas of the first to third light emitting units 31, 37, 41, more precisely, the yellow light emitting region Y, the green light emitting region G, the blue light emitting region B, and the red light emitting region R. Since the light emission area is an area ratio corresponding to the luminous flux ratio of the light of each color emitted from them, the maximum value of the luminance of each color emitted by the first to third light emitting units 31, 37, 41 is It becomes the same, and the brightness nonuniformity in the 1st-3rd light emission parts 31, 37, and 41 can be suppressed. Therefore, it is possible to suppress the illuminated surface from being mottled with the emission colors of the first to third light emitting units 31, 37, 41, and to further improve the illumination quality of the illuminated surface.

  A third embodiment of the present invention will be described with reference to FIGS. Since the third embodiment is the same as the first embodiment except for the matters described below, including the configuration not shown in FIG. 13, the same reference numerals as in the first embodiment are assigned to the same configurations as the first embodiment. The description is omitted.

  In the third embodiment, an electrical component 51 that forms at least a part of the control device 7 (see FIG. 1A) is mounted on the front surface of the substrate 23. These electrical components 51 are disposed around the recess 23a and are connected by a wiring pattern such as a copper foil (not shown) provided on the front surface. A part of the wiring pattern is used as an electrode. By adopting such a configuration, the pendant base 3 (see FIG. 1A) need not be provided with the control device 7, or the built-in component of the pendant base 3 can be reduced, so that the pendant base 3 can be reduced in size. .

  Further, a cover member 52 made of synthetic resin is provided on the substrate 23 so as to cover the front surface thereof. The cover member 52 is provided in an annular shape along the periphery of the recess 23a, and embeds the electrical component 51 and the wiring pattern. Therefore, the electrical component 51 can be mechanically and electrically protected by the cover member 52, and the electrical component 51 can be waterproofed. Furthermore, when the light emitting part of the first LED module 21 is exposed and used, the function of suppressing glare can be obtained by providing the cover member 52 with a light shielding angle θ corresponding to its thickness.

  Moreover, the inner peripheral surface 52a of the cover member 52 is formed with a tapered surface, for example. When the inner peripheral surface is formed of white or a mirror surface, the inner peripheral surface 52a can be used to control the light distribution of the light emitted from the first LED module 21.

  The configuration of the third embodiment other than that described above is the same as that of the first embodiment. Therefore, for the reason already described in the first embodiment, the problem of the present invention can also be solved in the third embodiment.

(A) is a side view which shows the lighting fixture provided with the illuminating device which concerns on 1st Embodiment of this invention. (B) is a rear view which shows the lamp of the lighting fixture. (C) is a front view which shows the lamp of the lighting fixture. (D) is a front view showing the lamp of the luminaire with its light control member removed. Sectional drawing which shows the lamp of the lighting fixture of FIG. The front view which shows the LED module with which the lamp of FIG. 2 was equipped. The figure which shows arrangement | positioning of each LED in the LED module of FIG. Sectional drawing of the LED module which follows F5-F5 line | wire in FIG. Sectional drawing of the LED module which follows F6-F6 line | wire in FIG. Sectional drawing of the LED module which follows F7-F7 line | wire in FIG. The figure which shows the spectral distribution of each light which each light emission part of the LED module of FIG. 3 emits. The figure which shows spectral distribution when the illumination in the LED module of FIG. 3 becomes Ra96 at the correlation color temperature of 2800K. The figure which shows spectral distribution when the illumination in the LED module of FIG. 3 becomes Ra96 at correlation color temperature 5000K. The figure which shows spectral distribution when the illumination in the LED module of FIG. 3 becomes Ra96 at the correlation color temperature of 6500K. The figure which shows the relationship between the luminous flux ratio of each luminescent color, Ra, and luminous efficiency at the time of correlation color temperature 5000K in the LED module of FIG. The front view which shows the LED module with which the illuminating device which concerns on 2nd Embodiment of this invention was equipped. (A) is a front view which shows the LED module with which the illuminating device which concerns on 3rd Embodiment of this invention was equipped. (B) is sectional drawing which follows the F14B-F14B line | wire in FIG. 14 (A).

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Lighting apparatus , 7 ... Control apparatus (a part of lighting apparatus), 11 ... Lamp main body, 21 ... 1st LED module (a part of lighting apparatus), 23 ... Board | substrate, 28 ... Partition, 31 ... 1st Light emitting part, 32, 34 ... blue LED (first blue light emitting diode), 33, 35 ... first sealing member, 37 ... second light emitting part, 38 ... blue LED (second blue light emitting diode), 39 ... 2nd sealing member, 41 ... 3rd light emission part, 42 ... Red LED, 43 ... 3rd sealing member, Y ... Yellow light emission area | region, G ... Green light emission area | region, B ... Blue light emission area | region, R ... Red light emitting area , A1, A2, C, D ... Partitioned area

Claims (7)

A substrate;
A plurality of first blue light-emitting diodes that emit blue light, a light-transmitting first sealing member that seals the blue light-emitting diodes, The first light emitting unit that emits green light or yellow light, including a phosphor mixed with a stop member and excited by the blue light;
A plurality of second blue light emitting diodes that are provided on the substrate adjacent to the first light emitting part and have a light emitting area smaller than that of the first light emitting part, and that emit blue light; And the second light emitting part having a light-transmitting second sealing member sealing the second blue light emitting diode;
A plurality of red light emitting diodes which are provided on the substrate adjacent to the first light emitting part and have a light emitting area smaller than that of the first light emitting part, and which emit red light; The third light-emitting portion having a light-transmitting third sealing member that seals the light-emitting diode;
A partition provided between the light emitting units by partitioning a plurality of regions where the light emitting units are provided;
An illumination device comprising:   The lighting device according to claim 1, wherein the second and third light emitting units are disposed so as to sandwich the first light emitting unit.   The first light emitting unit is divided into a rectangular yellow light emitting region that emits yellow light and a green light emitting region that continuously emits green light so as to protrude from the longitudinal center of the yellow light emitting region. The lighting device according to claim 1 or 2, characterized in that   The number of the first blue light emitting diodes disposed in the yellow light emitting region is arranged per unit area per unit area of the light emitting diodes disposed in the green light emitting region and the second and third light emitting units, respectively. The lighting device according to claim 3, wherein the number of the lighting devices is smaller than the number of the lighting devices.   5. The light emitting area of each of the first to third light emitting parts is an area ratio corresponding to a light flux ratio of light of each color emitted by each of the light emitting parts. The lighting device according to one item.   The green light emitting region has a peak wavelength between 495 and 535 nm, the yellow light emitting region has a peak wavelength between 550 and 600 nm, and the blue light emitting diode has an emission wavelength of 435 to 535 nm. 6. The illumination device according to claim 3, wherein the illumination device has a peak wavelength between 475 nm and the emission wavelength of the red light emitting diode is 610 nm or more.   The illumination device according to any one of claims 1 to 6, further comprising a control device that adjusts the emission intensity of each of the first and second blue light emitting diodes and the red light emitting diode.

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