JP2008270701A - Light emitting device and illuminating fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting device and an illuminating fitting capable of emitting white light having high color rendering property and capable of dealing with various color temperatures, and further capable of providing various and variable colors. <P>SOLUTION: The light emitting device 10 includes a substrate 20, a first light emission part 30 composed of light emitting elements 30R, 30G, 30B with three kinds or more different wavelengths disposed in a predetermined arrangement pattern on the substrate, and a second light emitting part 40 having light emitting elements 40B, 41B for excitating phosphors and phosphors 24, 25 excited by the light emitting elements. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light emitting device and a lighting fixture using a light emitting diode or the like as a light source.

  In recent years, instead of filament light bulbs and fluorescent lamps, lamps that use light-emitting diodes, which are semiconductor light-emitting elements that have a long lifetime and low power consumption, have been adopted as light sources for various lighting fixtures.

  However, when a light emitting diode is used as a light source for illumination, it is important to obtain white light emission. In order to realize white light emission for illumination, high color rendering properties of Ra 80 to 85 and 90 or more that are similar to fluorescent lamps are required. (Ra: Color rendering index) Also for the color temperature, a lineup up to various color temperatures of 6700K, 5000K, 4200K, 3000K, and 2800K is required in consideration of HID lamps, light bulbs, fluorescent lamps, and the like.

  In recent years, in conjunction with the diversification of lifestyles, there has been a demand for lighting fixtures that can easily change the color of lighting according to the atmosphere even in ordinary households. As a lighting environment for business and facilities, fruits in stores etc. In sales floors and vegetable sales areas, for example, illuminate apples in red and green vegetables in green, or illuminate in colors that give a high-class feeling to products that are highly important in sales, such as bags and shoes. There is a demand for lighting fixtures that can create lighting environments tailored to various scenes such as changing seasons.

In order to solve this demand, there are variable color light emitting diodes, lighting fixtures, and the like using light emitting diodes for illumination of a desired color in the following Patent Document 1 and Patent Document 2 as conventional examples.
JP 2003-152227 A JP 2005-1000079 A

  What is shown in Patent Document 1 is a light emitting module that uses a light emitting diode as a light source and is intended for illumination of a desired chromaticity. Specifically, in order to obtain a white or intermediate color, a filter member (lens) of the light emitting diode is used. A color correction unit having a chromaticity complementary to that of the light emitting diode is formed. However, the purpose is to improve the yield caused by the variation of the emission wavelength when manufacturing the light emitting diode, and in order to realize the above-mentioned white light emission for illumination, various filters must be prepared and manufactured. Have difficulty. It is also difficult to deal with various lighting environments. The variable color light emitting diode shown in Patent Document 2 cannot produce high color rendering by adjusting with a white light emitting diode. Nor is it compatible with various lighting environments.

  In addition, as a method for realizing white light emission with a light emitting diode, there is a method using three light emitting diodes each emitting light of blue wavelength of 460 nm, green color of 520 nm, and red color of 620 nm. Therefore, the color rendering property is lowered, and the color rendering property close to sunlight (Ra = 100) cannot be obtained. In order to solve this problem, a method of combining yellow light emitting diodes having a wavelength of about 550 nm is conceivable. However, there are few yellow light emitting diodes at present, and it is difficult to increase color rendering because it is dark. . In order to improve the color rendering, it is conceivable to combine light emitting diodes of respective main wavelengths, but light emitting diodes having a considerable number of main wavelengths are required, and it is commercially realized to be realized as a light emitting device for a lighting fixture. It is also difficult.

  For this reason, light-emitting devices and lighting fixtures that use this type of light-emitting diode as a light source have high color rendering properties, and can produce white light emission that can correspond to various color temperatures according to the lineup of lighting lamps. An important issue is how to realize a light emitting device capable of obtaining a variable color applied to an illumination environment.

  The present invention has been made in view of the problems and problems described above, and is a light-emitting device that has a high color rendering property and can produce white light emission that can cope with various color temperatures and can obtain various variable colors. And to provide lighting fixtures.

  In order to achieve the object of the present invention, the invention of the light emitting device according to claim 1 is a first light emission comprising a substrate and three or more types of light emitting elements having different wavelengths arranged on the substrate in a predetermined arrangement pattern. And a second light-emitting part disposed on the substrate adjacent to the first light-emitting part and having a phosphor-exciting light-emitting element and a phosphor excited by the light-emitting element. Features.

  According to the present invention, it is possible to obtain a variety of variable colors by the first light emitting unit configured by three or more types of light emitting elements having different wavelengths arranged in a predetermined arrangement pattern on the substrate.

  In addition, the second light-emitting part, which is disposed adjacent to the first light-emitting part and has a phosphor-exciting light-emitting element and a phosphor excited by the light-emitting element, has high color rendering properties and various color temperatures. White light emission can be obtained.

  In the present invention, the light emitting element is preferably a semiconductor light emitting element such as a light emitting diode or a semiconductor laser. As the light emitting elements having three or more different wavelengths, for example, a red light emitting diode chip having a main wavelength of 620 nm, a green light emitting diode chip having a main wavelength of 520 nm, a blue light emitting diode chip having a main wavelength of 460 nm, and the like are allowed. For example, a blue light-emitting diode chip having a dominant wavelength of 460 nm is allowed as the light-emitting element for phosphor excitation. The phosphor excited by the light emitting element is, for example, a yellow phosphor and a red phosphor excited by a blue light emitting diode chip having a main wavelength of 460 nm, or a yellow fluorescent light excited by a blue light emitting diode chip having a main wavelength of 460 nm. Body is acceptable. The above red, green, blue, and yellow preferably emit light mainly from red, green, blue, and yellow in the chromaticity diagram, but are slightly shifted on the chromaticity diagram within a range that does not impede practically. , Red, green, blue, and yellow. The predetermined arrangement pattern may be arranged in a line shape, a matrix shape, or a ring shape.

  In order to dissipate heat generated from semiconductor light-emitting elements, etc., the substrate is allowed to be composed of a metal with good thermal conductivity such as aluminum, but a synthetic resin material coated with a metal film such as aluminum Further, a material coated with aluminum foil or the like may be used, and the material is not limited to a specific material.

  The invention of the light-emitting device according to claim 2 includes: a substrate; a first light-emitting unit including a red light-emitting diode chip, a green light-emitting diode chip, and a blue light-emitting diode chip arranged in a predetermined arrangement pattern on the substrate; A light emitting diode chip and a low color temperature light emitting part comprising a yellow phosphor and a red phosphor excited by the blue light emitting diode chip, a blue light emitting diode chip and a yellow phosphor excited by the blue light emitting diode chip A second light-emitting part configured on the substrate adjacent to the first light-emitting part; and changing at least one light-emitting color of the first light-emitting part and the second light-emitting part. And a variable color means.

  In the present invention, the red light emitting diode chip of the first light emitting unit may be a light emitting diode chip having a dominant wavelength of 620 nm, but is not limited thereto. The green light emitting diode chip may be a light emitting diode chip having a dominant wavelength of 520 nm, but is not limited thereto. The blue light emitting diode chip may be a light emitting diode chip having a dominant wavelength of 460 nm, but is not limited thereto.

  The blue light emitting diode chip for exciting the phosphor of the second light emitting unit is allowed to be a blue light emitting diode chip having a dominant wavelength of 460 nm, but is not limited thereto. The blue light emitting diode chip of the second light emitting part and the low color temperature light emitting part comprising the yellow phosphor and the red phosphor excited by the blue light emitting diode chip preferably emit light bulb color having a color temperature of 3000K. However, it is not limited to this. In addition, the high color temperature light emitting section including the blue light emitting diode chip and the yellow phosphor excited by the blue light emitting diode chip preferably emits a daylight color having a color temperature of 6700K, but is not limited thereto. In other words, the color temperature of the high color temperature light emitting unit may be higher than the color temperature of the low color temperature light emitting unit.

 The first light emitting part has a transparent resin layer on the light emitting element, the second light emitting part has a phosphor layer on the light emitting element, and the first light emitting part and the second light emitting part are alternately adjacent to each other on the substrate. May be arranged in a line.

  For example, a silicone resin or an epoxy resin is allowed for the transparent resin layer, and the transparent resin layer may be formed on the outside of a light emitting element such as a light emitting diode chip by means of coating or filling.

  The phosphor layer may be formed as a layer in which a predetermined phosphor is mixed and dispersed in addition to a transparent resin such as a silicone resin or an epoxy resin. The phosphor layer can be formed so as to cover the outside of the light emitting element, but a transparent resin layer is formed in advance so as to directly cover the light emitting element, and a layer containing the phosphor is provided thereon. Also good. You may make it form the transparent resin layer mentioned above as a transparent resin layer which does not contain fluorescent substance. Alternatively, the phosphor layer may be configured as a phosphor sheet containing a phosphor, a transparent resin layer may be provided to cover the light emitting element, and a phosphor sheet may be provided on the transparent resin layer.

  The variable color means may be configured so that only the first light emitting unit is variable, only the second light emitting unit is variable, and both the first and second are variable. The means for varying may be a means for adjusting the type and composition of the phosphor and / or the thickness of the phosphor resin. Further, it may be a means for adjusting and varying the electric energy supplied to each light emitting diode.

  The invention of the light-emitting device according to claim 3 includes: a substrate; a first light-emitting unit composed of a red light-emitting diode chip, a green light-emitting diode chip, and a blue light-emitting diode chip arranged in a predetermined arrangement pattern on the substrate; LIGHT EMITTING DIODE CHIP AND LOW COLOR TEMPERATURE LIGHT EMITTING UNIT HAVING YELLOW FLUORESCENT AND RED PHOSPHOR EXCITIVE BY THIS BLUE LIGHT EMITTING DIODE CHIP A medium color temperature light emitting part comprising a blue light emitting diode chip and a high color temperature light emitting part comprising a yellow phosphor excited by the blue light emitting diode chip. A second light-emitting portion disposed adjacent to the second light-emitting portion; a variable color that changes at least one light-emitting color of the first light-emitting portion and the second light-emitting portion Characterized by comprising: stage and.

  In the present invention, the blue light emitting diode chip of the second light emitting portion and the medium color temperature light emitting portion having the green phosphor excited by the blue light emitting diode chip may emit daylight white having a color temperature of 5000K. Although preferable, it is not limited to this. That is, the color temperature may be intermediate between the low color temperature light emitting unit and the high color temperature light emitting unit.

 The green phosphor is preferably composed of a yellow phosphor and a green phosphor, but is not limited thereto. The green phosphor may be formed as a layer in which a predetermined phosphor is mixed and dispersed in a transparent resin such as a silicone resin or an epoxy resin. The phosphor layer can be formed so as to cover the outside of the light emitting element, but a transparent resin layer is formed in advance so as to directly cover the light emitting element, and a layer containing the phosphor is provided thereon. Also good.

 It is preferable that the medium color temperature light emitting unit is located at a substantially central portion between the low color temperature light emitting unit and the high color temperature light emitting unit, in other words, the entire light emitting unit including the first and second light emitting units. However, the position and order of arrangement are not particularly limited.

  The invention of the light-emitting device according to claim 4 includes: a substrate; a first light-emitting unit configured by a red light-emitting diode chip, a green light-emitting diode chip, and a blue light-emitting diode chip arranged in a predetermined arrangement pattern on the substrate; A light emitting diode chip, a blue light emitting diode chip, a medium color temperature light emitting section having a green phosphor excited by the blue light emitting diode chip, and a red light emitting diode chip, the first light emitting section on the substrate. A second light-emitting section disposed adjacent to the second light-emitting section; and variable color means for changing a light emission color of at least one of the first light-emitting section and the second light-emitting section.

  In the present invention, the blue light emitting diode chip of the second light emitting unit may be a light emitting diode chip having a dominant wavelength of 460 nm, but is not limited thereto. The blue light emitting diode chip that excites the green phosphor may be a light emitting diode chip having a dominant wavelength of 460 nm, but is not limited thereto. As the red light-emitting diode chip, a light-emitting diode chip having a dominant wavelength of 620 nm is allowed, but is not limited thereto.

 It is preferable that the medium temperature light emitting unit including the blue light emitting diode chip of the second light emitting unit and the green phosphor excited by the blue light emitting diode chip emits white light having a color temperature of 5000K. It is not limited to.

 The blue light emitting diode chip and the red light emitting diode chip of the second light emitting unit may be formed such that a transparent resin layer is formed on the outside by means of coating or filling.

 The green phosphor is preferably composed of a yellow phosphor and a green phosphor, but is not limited thereto.

 It is preferable that the medium color temperature light emitting part is located between the blue light emitting diode chip and the red light emitting diode chip, in other words, in the entire light emitting part including the first and second light emitting parts. The position and order of arrangement are not particularly limited.

 According to a fifth aspect of the present invention, in the light-emitting device according to any one of the first to fourth aspects, the first light-emitting portions and the second light-emitting portions are arranged adjacent to each other in a line on the substrate. It is characterized by.

  The first light emitting unit and the second light emitting unit are alternately adjacently arranged in a line on the substrate, so that the light can be emitted uniformly. For example, the first light emitting unit composed of three lines and It is allowed that the second light-emitting portions composed of two or three lines are alternately arranged adjacent to each other.

  An invention of a lighting fixture according to a sixth aspect includes the light emitting device according to any one of the first to fifth aspects; and a fixture main body on which the light emitting device is arranged.

  The light emitting device is configured as a single lighting module, or functions as a single lighting module, and a plurality of light emitting devices are arranged in a planar shape, a line shape, a ring shape, or even a spherical shape to form a lighting fixture. It may be.

  According to the first aspect of the present invention, a light emitting device capable of obtaining a variety of variable colors by the first light emitting unit composed of three or more types of light emitting elements having different wavelengths arranged in a predetermined arrangement pattern on the substrate. Can be provided.

  In addition, the second light-emitting part, which is disposed adjacent to the first light-emitting part and has a phosphor-exciting light-emitting element and a phosphor excited by the light-emitting element, has high color rendering properties and various color temperatures. In addition, it is possible to provide a light emitting device capable of obtaining white light emission that can cope with the above.

  According to the second aspect of the present invention, various variable colors can be obtained by the first light emitting part composed of the red light emitting diode chip, the green light emitting diode chip and the blue light emitting diode chip arranged in a predetermined arrangement pattern on the substrate. It is possible to provide a light emitting device capable of satisfying the requirements.

  Also, a blue light emitting diode chip, a low color temperature light emitting portion having a yellow phosphor and a red phosphor excited by the blue light emitting diode chip, a blue light emitting diode chip and a yellow excited by the blue light emitting diode chip. White color that is composed of a high color temperature light emitting part having a phosphor and is arranged on the substrate adjacent to the first light emitting part. A light-emitting device capable of emitting light can be provided.

  In addition, the variable color means that changes the emission color of at least one of the first and second light-emitting units provides a variety of lighting environments based on white light emission that has high color rendering properties and is compatible with various color temperatures. A light-emitting device that can be provided can be provided.

  According to the invention of claim 3, a blue light emitting diode chip, a low color temperature light emitting portion comprising a yellow phosphor and a red phosphor excited by the blue light emitting diode chip, a blue light emitting diode chip, and the blue light emitting A medium color temperature light emitting part having a green phosphor excited by a diode chip, and a high color temperature light emitting part having a blue light emitting diode chip and a yellow phosphor excited by the blue light emitting diode chip. With the second light emitting unit that is configured and disposed adjacent to the first light emitting unit on the substrate, a light emitting device that can produce white light emission that has high color rendering properties and can cope with various color temperatures can be provided.

  According to the invention of claim 4, a blue light-emitting diode chip, a medium-temperature light-emitting portion comprising a blue light-emitting diode chip and a green phosphor excited by the blue light-emitting diode chip, and a red light-emitting diode chip The second light-emitting part, which is configured and arranged adjacent to the first light-emitting part on the substrate, produces white light that has high white color efficiency, high color rendering, stable color temperature, and supports various color temperatures. The resulting light-emitting device can be provided.

 According to the invention of claim 5, since the first light-emitting portions and the second light-emitting portions are alternately adjacent to each other and arranged in a line on the substrate, light can be emitted uniformly.

  According to the sixth aspect of the present invention, it is possible to provide a luminaire that is capable of obtaining white light emission that has high color rendering properties and that can cope with various color temperatures and that can obtain various variable colors.

  Hereinafter, embodiments of a light emitting device and a lighting fixture according to the present invention will be described.

  As shown in FIGS. 1-4, the light-emitting device of a present Example is comprised as a lighting fixture which performs indoor illumination, The light-emitting device 10 is the 1st light emission part arranged on the board | substrate 20 and a board | substrate. 30, the second light emitting unit 40 disposed adjacent to the first light emitting unit, and the variable color means 50 for changing the light emission color of at least one of the first light emitting unit and the second light emitting unit.

  The substrate 20 is made of aluminum having good thermal conductivity, and is configured to have a flat plate rectangular shape in order to obtain a light emitting area required for the light emitting device. The substrate 20 has a thin box shape with a rectangular cross section serving as a heat sink, and a plurality of (in this embodiment, ten) grooves 20a to 20j are formed on the upper surface along the longitudinal direction. Each groove is formed as a reflecting surface inclined so that both side surfaces expand toward the open portion, and is formed by applying a white paint or the like having a high visible light reflectance to the surface.

  Further, a rectangular printed wiring board on which a plurality of light emitting diodes (hereinafter referred to as “LEDs”) constituting the first light emitting unit 30 and the second light emitting unit 40 are respectively mounted is overlapped on the inner bottom surface.

  The first light emitting unit 30 includes a red LED chip 30R having a dominant wavelength of 620 nm, a green LED chip 30G having a dominant wavelength of 520 nm, and a blue LED chip 30B having a dominant wavelength of 460 nm.

  A plurality of each of these three types of LED chips are prepared, and are mounted so as to be arranged at substantially equal intervals along the longitudinal direction of each rectangular printed wiring board 21R, 21G, 21B.

  A wiring board 21R on which a plurality of red LED chips 30R are mounted is arranged in the groove 20a at the left end of the substrate 20 in FIGS. 1 and 2, and hereinafter, the green LED chip 30G is placed in the adjacent groove 20b and the blue LED chip 30B. Are sequentially arranged in the adjacent grooves 20c, and the first light emitting units 30 are arranged in a line on the substrate 20. Each groove of the substrate disposed above is filled with a transparent resin such as a silicone resin or an epoxy resin so as to cover the outside of each LED chip, and a transparent resin layer 22 is formed.

  The second light emitting unit 40 includes a blue LED chip 40B having a main wavelength of 460 nm, a low color temperature light emitting unit A having a yellow phosphor 25 and a red phosphor 24 excited by the blue LED chip 40B, and a main wavelength. Is composed of a blue LED chip 41B having a wavelength of 460 nm and a high color temperature light emitting part B having a yellow phosphor 25 excited by the blue LED chip 41B.

 The low color temperature light emitting part A having the yellow phosphor 25 and the red phosphor 24 excited by the blue LED chip 40B emits a light bulb color having a color temperature of 3000K. Further, a daylight color having a color temperature of 6700K is emitted by the high color temperature light emitting part B having the yellow phosphor 25 excited by the blue LED chip 41B.

  A plurality of each of these two types of LED chips 40B and 41B are prepared, and are mounted at substantially equal intervals along the longitudinal direction of each of the rectangular printed wiring boards 22B and 23B.

  The wiring board 22B on which the plurality of blue LED chips 40B are mounted is disposed in the groove 20d adjacent to the blue LED chip 30B of the first light emitting unit, and the blue LED chips 41B are sequentially disposed in the adjacent groove 20e.

  Each groove of the substrate 20 arranged as described above is filled with a phosphor. That is, the groove 20d in which the blue LED chip 40B for emitting the light bulb color having a color temperature of 3000K is disposed is filled with the yellow phosphor 25 and the red phosphor 24 excited by the blue LED chip 40B.

  Also, the yellow phosphor 25 excited by the blue LED chip 41B is filled in the groove 20e in which the blue LED 41B for emitting the daylight color of 6700K is disposed. These fillings are formed as a layer covering the outside of each LED chip and mixing and dispersing a predetermined phosphor in a transparent resin such as a silicone resin or an epoxy resin. A transparent resin layer may be formed in advance so as to directly cover each LED chip, and a layer containing a phosphor may be provided thereon.

  As described above, the second light emitting units 40 formed of two rows are arranged adjacent to the first light emitting units 30 formed of three rows on the substrate 20. In this embodiment, another light emitting group composed of the three rows of the first light emitting portions 30 and the two rows of the second light emitting portions 40 is arranged and configured.

  That is, the LED chips 30R, 30G, and 30B of the first light emitting unit 30 are respectively disposed in the grooves 20f, 20g, and 20h of the substrate in the same manner as described above, and the LED chips 40B of the second light emitting unit 40 are disposed in the grooves 20i and 20j. , 41B are arranged respectively. Similarly to the above, the transparent resin layer 22 and the phosphor layers 24 and 25 are provided corresponding to the respective LED chips. Thus, two rows of second light emitting units 40 are adjacent to the three rows of first light emitting units 30, three rows of first light emitting units 30 are adjacent thereto, and two rows of second light emitting units 40 are adjacent thereto. The first light emitting units and the second light emitting units are alternately arranged adjacent to each other in a line shape on the substrate.

Examples of the red phosphor 24 include oxysulfide phosphors such as La ₂ O ₂ S: Eu phosphor, nitride phosphors (for example, AE ₂ Si ₅ N ₈ : Eu ²⁺ and CaAlSiN ₃ : Eu). ²⁺ ) and the like are used, but are not particularly limited. The yellow phosphor 25 is, for example, a YAG phosphor such as RE ₃ (Al, Ga) ₅ O ₁₂ : Ce phosphor (RE represents at least one selected from Y, Gd and La), (Tb , Al) ₅ O ₁₂ : Ce phosphor such as Ce phosphor, sialon phosphor (for example, CaxSiyAlzON: Eu ²⁺ ), AE ₂ SiO ₄ : Eu phosphor (AE is an alkali such as Sr, Ba, Ca, etc.) Selected from among silicate phosphors such as Sr ₃ Si ₃ O ₅ : Eu ²⁺ phosphors according to the characteristics and applications of the phosphors (the above x, y, z) The coefficient of can be determined as appropriate). For example, a red phosphor having an emission peak in a wavelength range of 590 nm or more and less than 650 nm when excited by the blue light, a yellow phosphor having an emission peak in a wavelength range of 540 nm or more and less than 590 nm, or the like can be used.

  The types and blending ratios of the phosphors that emit these monochromatic lights are such that the Ra of light emitted from the light emitting device is high and high luminous efficiency is obtained, and white at a desired color temperature is obtained. To be adjusted.

  The variable color means 50 may be constituted by means for adjusting the type, blending, and / or thickness of the phosphor resin as described above, but in this embodiment, the electric energy supplied to each LED is changed. It is composed of means for adjusting and varying. That is, the control circuit constituting the variable color means 50 has two control switches 51 and 52 as schematically shown in FIG.

  The control switch 51 controls each LED chip of the first light emitting unit 30, and generates a PWM signal for continuously switching the color of emitted light from “red” → “green” → “blue”. And a slide type switch capable of sliding the knob 51a to the left and right along the switching display.

  The control switch 52 includes a circuit that generates a PWM signal for continuously switching the color temperature of the second light emitting unit 40 from “high color temperature” → “medium color temperature” → “low color temperature”. In this embodiment, the switch 52 is composed of a slide type switch that can slide the knob 52a to the left and right along the switching display of “daylight”, “daylight”, and “bulb”.

  The slide switches 51 and 52 can easily set the lighting environment required by the user steplessly by sliding the respective knobs to the left and right according to the switching display.

  In addition, the two groups of LED chips 30R, 30G and 30B constituting the first light emitting unit 30 are connected in parallel to the control circuit, and the two groups of LED chips 40B and 41B constituting the second light emitting unit 40 are also connected. Each of the parallel LED chip groups is connected in series to the photocouplers 51b and 52b that are turned on / off in response to the PWM signals from the control switches 51 and 52 described above. 53 is a DC power supply.

  The control switch 51 generates a PWM signal corresponding to the operation of switching between “red”, “green”, and “blue”, and the electric power supplied to each LED chip increases or decreases steplessly in accordance with the PWM signal. Depending on the sliding direction of the control switch 51, the color of the emitted light is stepless from “red” to “green” to “blue”, or conversely from “blue” to “green” to “red”. Can be varied.

  Further, the control switch 52 generates a PWM signal corresponding to the operation for switching between “daylight color”, “daylight white”, and “bulb color”, and in accordance with this PWM signal, the power supplied to each LED chip is stepless. Depending on the slide direction of the control switch 52, the color temperature of the emitted light is changed to “daylight color” → “daylight white” → “bulb color”, or conversely “bulb color” → “daylight white” → “Daylight color” can be changed steplessly.

  As shown in FIG. 4, the light emitting device 10 configured as described above is housed in an appliance body 60 made of an aluminum case body having good thermal conductivity, and the opening of the appliance body faces a colorless surface facing the light emitting device. A lighting fixture 70 is configured as a surface light source by being blocked by a transparent body 61 made of transparent polycarbonate or the like. The luminaire 70 is separately connected to a controller 80 having the control circuit 50 via a cable. The controller 80 is provided with a power switch for turning on / off the power and the control switches 51 and 52 of the control circuit 50.

  A description will be given of a method of illuminating, for example, the inside of a store in accordance with various lighting environments by using the light emitting device and the lighting fixture configured as described above.

  For example, when it is desired to perform lighting in a lighting environment that makes the room feel cool in the hot summer season, first, the control switch 52 is slid so as to match the switching display of “daylight”.

  Thereby, a PWM signal corresponding to the operation for switching to “daylight color” is supplied to the second light emitting unit 40, and the blue LED chip 41B of the high color temperature light emitting unit B mainly emits light to excite the yellow phosphor 25, thereby increasing the high light temperature. Light with a color temperature close to the daylight color (6700K), which is the color temperature, is emitted, and an illumination environment that produces “coolness” with a bluish color can be created.

  In addition, when it is desired to perform illumination in a white illumination environment close to soft sunlight in accordance with an environment in which spring and autumn are comfortable, the control switch 52 is set to a “day white” switching display.

  Thereby, the PWM signal corresponding to the operation for switching to “daylight” is supplied to the second light emitting unit 40, and the blue LED chip 40B of the low color temperature light emitting unit A and the blue LED chip 41B of the high color temperature light emitting unit B are The blue LED chip 40B excites the yellow phosphor 25 and the red phosphor 24, and further the blue LED chip 41B excites the yellow phosphor 25, and each of them is mixed and is a neutral white temperature (5000K). Light with a color temperature close to is emitted, and an illumination environment that produces a white illumination environment close to soft sunlight can be created.

  In addition, when lighting is performed in a lighting environment that makes the room feel warm in the cold season of winter, the control switch 52 is set to the “bulb” switching display. As a result, a PWM signal corresponding to the operation for switching to “bulb color” is supplied to the second light emitting unit 40, and the blue LED chip 40B of the low color temperature light emitting unit A mainly emits light, and the yellow phosphor 25 and the red phosphor 24. , And light having a color temperature close to a light bulb color (3000K), which is a low color temperature, is emitted, and an illumination environment that produces “warmth” with a reddish color can be created.

  To switch between “daylight color”, “daylight white”, and “bulb color” in the above, the supplied power can be adjusted steplessly by the PWM signal, and the black body locus a on the chromaticity diagram shown in FIG. 5 and FIG. The white light emission that can correspond to various color temperatures substantially along the line, particularly along the broken line in FIG. In other words, it is possible to produce white light emission that can correspond to various color temperatures of the illumination lamps in the lineup. In FIG. 6, D, W, and L indicate the color temperatures of the daylight color fluorescent lamp, the daylight white fluorescent lamp, and the light bulb color fluorescent lamp, respectively.

  At the same time, the yellow LED 25 and the red phosphor 24 are filled in the blue LED chip 40B, and the yellow phosphor 25 is filled in the blue LED chip 41B. For this reason, the light emitted from the second light emitting unit 40 has a high color rendering property by mixing the light emitted from the LED chips 40B and 41B and the yellow and red colors excited by the phosphors 24 and 25, respectively. (Ra = 80), it is possible to produce white light along the black body locus a, which is closer to sunlight.

  Next, various variable colors are obtained by operating the control switch 51. That is, the control switch 51 generates a PWM signal corresponding to the operation for switching between “red”, “green”, and “blue”, and the red LED chip 30R and the green LED chip of the first light emitting unit 30 according to the PWM signal. The power supplied to 30G and the blue LED chip 30B is increased or decreased steplessly.

  As a result, as shown in the chromaticity diagram of FIG. 6, various colors can be created within the range of the triangle S1 surrounding the R point with a wavelength of 620 nm, the G point with a wavelength of 520 nm, and the B point with a wavelength of 460 nm. For example, when the background is illuminated in red in stage lighting or the like, the control switch 51 is slid to match the “red” switching display. As a result, a PWM signal corresponding to the operation for switching to “red” is supplied to the first light emitting unit 30, and the red LED chip 30R having a wavelength of 620 nm mainly emits light, thereby creating an illumination environment that is produced in red.

  Similarly, when the control switch 51 is slid to match the “green” switching display, the green LED chip 30G having a wavelength of 520 nm mainly emits light, and an illumination environment produced in green can be created.

  Furthermore, when the display is slid to match the “blue” switching display, the blue LED chip 30 </ b> B having a wavelength of 460 nm mainly emits light, and an illumination environment produced in blue can be created.

  Further, the control switch can be slid to an arbitrary position, and various color lighting environments within the range of the triangle S1 on the chromaticity diagram described above can be arbitrarily created. Further, by operating both the control switches 51 and 52 to cause the first and second light emitting units to emit light simultaneously, various colors can be obtained. In particular, since the white light of the second light emitting unit 40 capable of producing light with high color rendering properties can be mixed with the light of various colors emitted from the first light emitting unit 30, the color rendering property can be improved. A wide variety of high-quality light can be created, creating a lighting environment with more dramatic effects.

  In each of the above operations, the light diffused in the peripheral direction without traveling straight out of the light emitted from each LED chip is reflected by the reflecting surface of the substrate 20 and is radiated from the translucent body 61 without light loss. . Further, the heat generated from each LED chip is directly conducted to the substrate 20 made of aluminum, and is effectively released from the outer peripheral surface of the instrument body 60 to the outside, thereby suppressing the temperature rise of each LED chip.

  As described above, according to the present embodiment, the yellow phosphor 25 and the red phosphor 24 are emitted to the blue LED 40B for emitting a light bulb color having a color temperature of 3000K, and the yellow LED is illuminated to the blue LED 41B for emitting a daylight color having a color temperature of 6700K. Since the second light emitting unit 40 composed of the low color temperature light emitting unit A and the high color temperature light emitting unit B is configured by filling each of the bodies 25, the power supplied to each LED chip can be adjusted steplessly. The color rendering property is high (Ra = 80), and it is possible to produce white light substantially along the black body locus a. At the same time, it is possible to produce white light emission that substantially corresponds to the black body locus a and can correspond to various color temperatures of the line-up lighting lamps.

  Furthermore, the first light emitting unit 30 is configured by a red LED chip having a dominant wavelength of 620 nm, a green LED chip having a dominant wavelength of 520 nm, and a blue LED chip having a dominant wavelength of 460 nm, and the power supplied to each LED chip is adjusted steplessly. Therefore, it is possible to create various colors within the range of the triangle S1 surrounding the point R of wavelength 620 nm, the point G of wavelength 520 nm, and the point B of wavelength 460 nm on the chromaticity diagram. The lighting environment can be created arbitrarily.

  Furthermore, by causing the first and second light emitting sections to emit light simultaneously, it is possible to provide various illumination environments based on white light emission that has high color rendering properties and can also cope with various color temperatures. In addition, since the three rows of the first light emitting units 30 and the two rows of the second light emitting units 40 are alternately arranged adjacent to each other in a line shape, the light can be emitted uniformly and the number of lines is small and the second number is thin. The phosphor layer of the light emitting part can be filled easily and reliably.

  As described above, in the present embodiment, the first light emitting unit is configured by a red LED chip having a dominant wavelength of 620 nm, a green LED chip having a dominant wavelength of 520 nm, and a blue LED chip having a dominant wavelength of 460 nm. A yellow LED chip may be added. According to this, as shown in the chromaticity diagram in FIG. 7, within the range of the rectangle S2 that surrounds the R point with a wavelength of 620 nm, the yellow Y point with a wavelength of 540 nm, the G point with a wavelength of 520 nm, and the B point with a wavelength of 460 nm. Various colors can be created. Furthermore, red, green, and blue LED chips may be added to create more colors.

  Although the luminaire 70 is composed of one light emitting device, a plurality of luminaires may be arranged in a planar shape, a line shape, a ring shape, or a spherical shape to constitute the luminaire. The controller 80 that controls the lighting fixture 70 is configured separately from the lighting fixture, but may be configured integrally.

  In this example, the second light emitting unit 40 is configured by the low color temperature light emitting unit A and the high color temperature light emitting unit B in Example 1, and further, a blue LED for emitting a daylight white color having a color temperature of 5000K. A chip and a medium color temperature light emitting unit having a green phosphor excited by the blue LED chip are added, and the configuration thereof will be described below with reference to FIGS. In FIG. 8 and FIG. 9, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As in the first embodiment, the first light emitting unit 30 includes a red LED chip 30R having a dominant wavelength of 620 nm, a green LED chip 30G having a dominant wavelength of 520 nm, and a blue LED chip 30B having a dominant wavelength of 460 nm. The wiring board 21R on which the red LED chip 30R is mounted is disposed in the groove 20a at the left end of the substrate 20 in FIG. 8, and hereinafter, the green LED chip 30G is in the adjacent groove 20b, and the blue LED chip 30B is further in the adjacent groove 20c. Are arranged in order.

  The second light emitting unit 40 of this embodiment includes a blue LED chip 40B having a main wavelength of 460 nm, and a low color temperature light emitting unit A including a yellow phosphor 25 and a red phosphor 24 excited by the blue LED chip 40B. A blue LED chip 42B having a main wavelength of 460 nm and a green phosphor excited by the blue LED chip 42B, in this embodiment, a medium color temperature light emitting part C having a yellow phosphor 25 and a green phosphor 26 And a high-color-temperature light emitting part B having a blue LED chip 41B having a main wavelength of 460 nm and a yellow phosphor 25 excited by the blue LED chip 41B.

 The low color temperature light emitting section A having the yellow phosphor 25 and the red phosphor 25 excited by the blue LED chip 40B having a dominant wavelength of 460 nm emits a light bulb color having a color temperature of 3000K. Further, the neutral color light emitting part C having the yellow phosphor 25 and the green phosphor 26 excited by the blue LED chip 42B having a main wavelength of 460 nm emits a daylight white color having a color temperature of 5000K. Further, a daylight color having a color temperature of 6700K is emitted by the high color temperature light emitting part B made of the yellow phosphor 25 excited by the blue LED chip 41B having a main wavelength of 460 nm.

  A plurality of each of these three types of LED chips 40B, 41B, and 42B are prepared, and are mounted by being arranged at substantially equal intervals along the longitudinal direction of each rectangular printed wiring board 22B, 23B, and 24B. The The wiring board 22B on which the plurality of blue LED chips 40B are mounted is disposed in the groove 20d adjacent to the blue LED chip 30B of the first light emitting unit, and further the blue LED chip 42B is disposed in the adjacent groove 20e. Blue LED chips 41B are sequentially arranged in the grooves 20f.

  Each groove of the substrate 20 arranged as described above is filled with a phosphor. That is, the groove 20d in which the blue LED chip 40B for emitting the light bulb color having a color temperature of 3000K is disposed is filled with the yellow phosphor 25 and the red phosphor 24 excited by the blue LED chip 40B. Also, the yellow phosphor 25 and the green phosphor 26 excited by the blue LED chip 42B are filled in the groove 20e in which the blue LED 42B for emitting a daylight white color having a color temperature of 5000K is disposed. Furthermore, the yellow phosphor 25 excited by the blue LED chip 41B is filled in the groove 20f in which the blue LED 41B for emitting a daylight color having a color temperature of 6700K is arranged.

  As described above, the second light emitting unit 40 composed of three rows is disposed adjacent to the first light emitting unit 30 composed of three rows on the substrate 20. In this embodiment, another light emitting group composed of the three rows of the first light emitting portions 30 and the three rows of the second light emitting portions 40 is arranged and configured. As a result, three rows of second light emitting units 40 are adjacent to the three rows of first light emitting units 30, three rows of first light emitting units 30 are adjacent thereto, and three rows of second light emitting units 40 are further adjacent thereto. The first light emitting units and the second light emitting units are alternately arranged adjacent to each other in a line shape on the substrate.

Examples of the green phosphor 26 include YAG phosphors such as RE ₃ (Al, Ga) ₅ O ₁₂ : Ce phosphor (RE represents at least one selected from Y, G, and La). Silicate phosphors such as AE ₂ SiO ₄ : Eu phosphor (AE represents an alkaline earth element such as Sr, Ba, and Ca) and Ca ₃ Sc ₂ Si ₃ O ₁₂ : Ce phosphor, sialon type The phosphor (for example, CaxSiyAlzON: Eu ²⁺ ) and the Ca ₃ Sc ₂ O ₄ : Ce phosphor are selected according to the characteristics and application of the phosphor (the coefficients of x, y, and z are appropriately determined) Can be determined). For example, it is possible to use a green phosphor that is excited by the blue light and has an emission intensity peak in a wavelength range of 500 nm or more and less than 540 nm.

  The light emitting device of the present embodiment configured as described above includes a lighting fixture 70 as a surface light source housed in the fixture main body 60 as in the first embodiment. For example, the interior of the store is adapted to various lighting environments. Lighting can be performed.

 In particular, since the second light emitting unit 40 is provided with the medium color temperature light emitting unit C including the yellow phosphor 25 and the green phosphor 26 excited by the blue LED chip 42B having a dominant wavelength of 460 nm, the green fluorescent light is provided. As shown by the broken line in FIG. 9, white light in a finer range along the black body locus a can be produced by the color mixture of the body 26.

 Further, the medium color temperature light emitting section C having the yellow phosphor 25 and the green phosphor 26 excited by the blue LED chip 42B has the yellow phosphor 25 and the red phosphor 24 excited by the blue LED chip 40B. Since the low color temperature light emitting part A and the high color temperature light emitting part B having the yellow phosphor 25 excited by the blue LED chip 41B are disposed, the brightness is relatively high. Since the green light emitting portions are located at the center of the three rows, it is possible to form a light emitting surface having a uniform luminance as a whole without shifting to one side.

 In this embodiment, the green phosphor is composed of a yellow phosphor and a green phosphor. However, the green phosphor may be configured to emit light in a white color close to a neutral white temperature of 5000 K, which is a medium color temperature, using only the green phosphor. . In addition, a combination of a blue LED chip and various phosphors may be used to add a light-emitting body that emits light at a different color temperature of 10000 K or the like so that white light can be produced in a finer range along the black body locus. .

  In addition, other configurations, operations, operational effects, modifications, and the like in the present embodiment are the same as those in the first embodiment.

 In the present embodiment, the second light-emitting portion includes a blue light-emitting diode chip, a medium-temperature light-emitting portion C including a blue light-emitting diode chip and a green phosphor excited by the blue light-emitting diode chip, and red light emission. This is a diode chip, and the configuration will be described with reference to FIG. In FIG. 10, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  As in the first and second embodiments, the first light emitting unit 30 includes a red LED chip 30R having a dominant wavelength of 620 nm, a green LED chip 30G having a dominant wavelength of 520 nm, and a blue LED chip 30B having a dominant wavelength of 460 nm. The wiring board 21R on which the red LED chips 30R are mounted is disposed in the groove 20a at the left end of the substrate 20 in FIG. 10, and hereinafter, the green LED chip 30G is adjacent to the adjacent groove 20b, and the blue LED chip 30B is further adjacent to the adjacent groove 20a. It arrange | positions in order in the groove | channel 20c.

  As shown in FIG. 10A, the second light emitting unit 40 of the present embodiment is excited by a blue LED chip 50B having a dominant wavelength of 460 nm, a blue LED chip 43B having a dominant wavelength of 460 nm, and the blue LED chip 43B. The medium color temperature light emitting portion C having the green phosphor 27 and the red LED chip 50R having a dominant wavelength of 620 nm are used. The neutral color temperature light emitting part C having the green phosphor 27 excited by the blue LED chip 43B having a dominant wavelength of 460 nm emits a daylight white color having a color temperature of 5000K.

 A plurality of each of these three types of LED chips 50B, 43B, 50R are prepared, and are mounted by being arranged at substantially equal intervals along the longitudinal direction of each rectangular printed wiring board 22B, 23B, 24B. The The wiring board 22B on which the plurality of blue LED chips 50B are mounted is disposed in the groove 20d adjacent to the blue LED chip 30B of the first light emitting unit, and further the blue LED chip 43B is disposed in the adjacent groove 20e. Red LED chips 50R are sequentially arranged in the grooves 20f.

  Each groove of the substrate 20 arranged as described above is filled with a transparent resin layer or a phosphor. That is, the transparent resin layer 22 is formed on the outside of the groove 20d in which the blue LED chip 50B is disposed by means such as coating or filling. Further, the green phosphor 27 excited by the blue LED chip 43B is filled in the groove 20e in which the blue LED 43B for emitting daylight white color having a color temperature of 5000K is disposed. Further, the transparent resin layer 22 is formed on the outer side of the groove 20f in which the red LED 50R is disposed by means such as coating or filling.

  As described above, the second light emitting unit 40 composed of three rows is disposed adjacent to the first light emitting unit 30 composed of three rows on the substrate 20. In this embodiment, another light emitting group composed of the three rows of the first light emitting portions 30 and the three rows of the second light emitting portions 40 is arranged and configured.

  The light emitting device of the present embodiment configured as described above includes a lighting fixture 70 that is housed in the fixture main body 60 and is used as a surface light source, as in the first and second embodiments. The lighting can be performed together. In particular, since the second light emitting unit 40 is provided with a medium color temperature light emitting unit C including the green phosphor 27 excited by the blue LED chip 43B having a dominant wavelength of 460 nm, As shown by the broken line in FIG. 9, white light in a finer range along the black body locus a can be created by the color mixture.

 In addition, since white is obtained by the combination of the blue LED chip and the green phosphor excited by the red LED chip and the blue LED chip, the efficiency of white becomes 50 lm / W or more, and the efficiency increases. Furthermore, for example, when a phosphor such as SiON is used as the green phosphor, the temperature characteristics are improved and the wavelength shift does not occur as in a light emitting diode. Incidentally, the efficiency of white is higher than the combination of blue LED chip + green LED chip + red LED chip. Furthermore, the efficiency of white is higher than the combination of blue LED chip + green phosphor (excited by blue LED chip) + red phosphor (excited by blue LED chip).

 In the present embodiment, the green phosphor 27 excited by the blue LED chip 43B is composed of a yellow phosphor and a green phosphor (close to yellow-green), even if it is composed of only a green phosphor, and has a daytime of 5000K. You may comprise so that it may light-emit in white near white.

 10B, the second light emitting unit 40 includes a blue LED chip 50B having a dominant wavelength of 460 nm, a blue LED chip 50B having a dominant wavelength of 460 nm, a red LED chip 50R having a dominant wavelength of 620 nm, and You may comprise the medium color temperature light emission part C which has the green type | system | group fluorescent substance 27, and the LED chip 90 which consists of a red LED chip whose main wavelength is 620 nm, or a blue LED chip whose main wavelength is 460 nm.

 In addition, other configurations, operations, functions, and modifications in the present embodiment are the same as those in the first and second embodiments.

  Although the lighting fixtures of the above embodiments are configured as lighting fixtures that perform indoor lighting, they may be configured as various lighting fixtures for home use and for outdoor use such as stores, facilities, and business use.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the scope of the present invention.

The light-emitting device which is 1st embodiment of this invention is shown, (a) is a top view, (b) is sectional drawing which follows the AA line of (a). FIG. 1B is a diagram corresponding to FIG. The control circuit diagram of a light-emitting device similarly. The cross-sectional view of a lighting fixture. The figure which shows typically the change of the color temperature of the 2nd light emission part of a light-emitting device similarly. The chromaticity diagram for showing the light emission area | region of a light-emitting device similarly. The chromaticity diagram for showing the light emission area | region of the light-emitting device in a modification similarly. FIG. 1B is a view corresponding to FIG. 1B illustrating a light emitting device according to a second embodiment of the present invention. The figure which shows typically the change of the color temperature of the 2nd light emission part of a light-emitting device similarly. The light-emitting device which is 3rd embodiment of this invention is shown, (a) is FIG.1 (b) equivalent view, (b) is FIG.1 (b) equivalent view which shows a part of modification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Light-emitting device 20 Substrate 24 Red fluorescent substance 25 Yellow fluorescent substance 26 Green fluorescent substance 27 Green fluorescent substance 30 1st light emission part 30R Red light emitting diode chip 30G Green light emitting diode chip 30B Blue light emitting diode chip 40 2nd light emission part A Low color Temperature light emitting part B High color temperature light emitting part C Medium color light emitting part 40B, 41B Blue light emitting diode chip 50 Variable color means 60 Appliance body 70 Lighting fixture

Claims (6)

A substrate;
A first light-emitting portion composed of three or more types of light-emitting elements having different wavelengths arranged in a predetermined arrangement pattern on the substrate;
A second light-emitting part disposed on the substrate adjacent to the first light-emitting part and having a phosphor-exciting light-emitting element and a phosphor excited by the light-emitting element;
A light-emitting device comprising: A substrate;
A first light-emitting part composed of a red light-emitting diode chip, a green light-emitting diode chip and a blue light-emitting diode chip arranged in a predetermined arrangement pattern on the substrate;
Blue light emitting diode chip, low color temperature light emitting section having yellow phosphor and red phosphor excited by blue light emitting diode chip, blue light emitting diode chip and yellow phosphor excited by blue light emitting diode chip A second light-emitting part, which is composed of a high-color-temperature light-emitting part and is disposed adjacent to the first light-emitting part on the substrate;
Variable color means for changing the emission color of at least one of the first light emitting part and the second light emitting part;
A light-emitting device comprising: A substrate;
A first light-emitting part composed of a red light-emitting diode chip, a green light-emitting diode chip and a blue light-emitting diode chip arranged in a predetermined arrangement pattern on the substrate;
Blue light emitting diode chip, low color temperature light emitting part having yellow phosphor and red phosphor excited by blue light emitting diode chip, blue light emitting diode chip and green fluorescent light excited by blue light emitting diode chip A first light emitting part on a substrate, comprising a medium color temperature light emitting part comprising a body, a blue light emitting diode chip and a high color temperature light emitting part comprising a yellow phosphor excited by the blue light emitting diode chip A second light emitting portion disposed adjacent to the second light emitting portion;
Variable color means for changing the emission color of at least one of the first light emitting part and the second light emitting part;
A light-emitting device comprising: A substrate;
A first light-emitting part composed of a red light-emitting diode chip, a green light-emitting diode chip and a blue light-emitting diode chip arranged in a predetermined arrangement pattern on the substrate;
A blue light emitting diode chip, a medium temperature light emitting portion having a blue light emitting diode chip and a green phosphor excited by the blue light emitting diode chip, and a red light emitting diode chip, the first light emitting portion on the substrate A second light emitting portion disposed adjacent to the second light emitting portion;
Variable color means for changing the emission color of at least one of the first light emitting part and the second light emitting part;
A light-emitting device comprising: 5. The light emitting device according to claim 1, wherein the first light emitting unit and the second light emitting unit are alternately adjacently arranged in a line on the substrate. A light emitting device according to any one of claims 1 to 5;
An instrument body having a light emitting device disposed thereon;
The lighting fixture characterized by comprising.

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