JP7274013B2 - lighting devices and lighting modules - Google Patents

Description

The present invention relates to lighting devices and lighting modules using LEDs and the like.

2. Description of the Related Art In recent years, lighting devices using semiconductor light-emitting elements such as LEDs (Laser Emitting Diodes) as light sources have been used in place of fluorescent lamps and light bulbs. Further, for example, a lighting device using a light-emitting element as a light source is also used as a light source for visual inspection of painted surfaces of home electric appliances, passenger cars, and the like. At this time, the lighting module includes a lighting device and a control circuit for controlling the lighting device.

A semiconductor light emitting device has a narrow wavelength band of emitted light and can only emit light of a single color. When it is desired to use white light as illumination light, a plurality of semiconductor light-emitting elements or light-emitting devices with different wavelength bands of emitted light are prepared, and white light is realized by mixing a plurality of colors of emitted light. By using such a color mixing method, it is possible to produce a light source having a spectrum according to a purpose other than white light (see Patent Document 1).

JP 2015-126160 A

However, the technique disclosed in Patent Document 1 requires a voltage conversion device for light emitting elements that emit different light. Therefore, there is a possibility that power consumption is lost due to voltage conversion. In addition, there is a risk that the size of the lighting device will be increased by the voltage conversion device.

A lighting device according to one embodiment of the present invention includes a first light emitting device and a second light emitting device. The first light emitting device has a first light emitting element mounted inside and a first phosphor covering the first light emitting element, and emits light in the visible light range. The second light emitting device emits light at the same potential as the first light emitting device, has a second light emitting element mounted inside, and a second phosphor covering the second light emitting element, and emits light in the visible light range. luminous.

A lighting module according to an embodiment of the present invention includes the lighting device described above and a control circuit electrically connected to the lighting device.

A lighting device according to an embodiment of the present invention does not require a voltage conversion device. The size can be reduced accordingly. Also, power consumption loss can be reduced. And according to the lighting module which concerns on one Embodiment of this invention, it can miniaturize by having said lighting device.

1 is an external perspective view of a light-emitting device in a lighting device according to an embodiment of the present invention; FIG. 2 is a cross-sectional view of the light emitting device shown in FIG. 1 taken along a plane indicated by a virtual line; FIG. 3 is an enlarged view of the light emitting device shown in FIG. 2; FIG. It is a figure which shows an example of the fluorescence spectrum of each fluorescent substance used with the light-emitting device among the illuminating devices which concern on embodiment of this invention. It is a figure which shows an example of the emission spectrum of the light emitting element used with the light emitting device among the illuminating devices which concern on embodiment of this invention. It is a circuit diagram which shows the lighting installation and lighting module which concern on embodiment of this invention. 1 is an external perspective view of a lighting device according to an embodiment of the present invention; FIG. 1 is an exploded perspective view of a lighting device according to an embodiment of the present invention; FIG. 1 is a perspective view showing a state in which a translucent substrate is removed from a housing of a lighting device according to an embodiment of the present invention; FIG.

Embodiments of a light-emitting device and a lighting device according to embodiments of the present invention will be described below with reference to the drawings.

<Structure of Light Emitting Device>
FIG. 1 is an external perspective view of a light emitting device according to one embodiment of the present invention. FIG. 2 is a cross-sectional view of the light-emitting device shown in FIG. 1 taken along a plane indicated by a virtual line. 3 is an enlarged view of the light emitting device shown in FIG. 2. FIG. FIG. 4 is a diagram showing an example of fluorescence spectra of respective phosphors used in the light emitting device of this embodiment. FIG. 5 is a diagram showing an example of the emission spectrum of the light emitting element used in the light emitting device of this embodiment. In these figures, the light-emitting device 1 includes a substrate 2, a light-emitting element 3, a frame 4, a sealing member 5, and a wavelength conversion member 6. FIG. The light-emitting device 1 indicates a first light-emitting device 11, a second light-emitting device 12, and a third light-emitting device 13, which will be described later. Further, the light emitting elements 3 include a first light emitting element 31 mounted on the first light emitting device 11, a second light emitting element 32 mounted on the second light emitting device 12, and a third light emitting element 32 mounted on the third light emitting device 13, respectively. 3 shows the light emitting element 33, and for the sake of convenience, common items will be described as the light emitting element 3 below.

The light emitting device 1 includes a substrate 2, a light emitting element 3 provided on the substrate 2, a frame 4 provided on the substrate 2 so as to surround the light emitting element 3, and an inner space surrounded by the frame 4. The upper surface of the sealing member 5 is filled in a part of the upper part of the inner space surrounded by the frame 4, and the upper part of the space surrounded by the frame 4 is filled inside. and a wavelength conversion member 6 provided so as to be accommodated in the frame 4 along the . The light emitting element 3 is, for example, an LED, and emits light to the outside by recombination of electrons and holes in a pn junction using a semiconductor.

The substrate 2 is an insulating substrate made of, for example, a ceramic material such as alumina or mullite, or a glass ceramic material. Alternatively, it is made of a composite material in which a plurality of these materials are mixed. Further, the substrate 2 can be made of polymer resin in which metal oxide fine particles are dispersed, which can adjust the thermal expansion of the substrate 2 .

At least on the main surface of the substrate 2 or inside the substrate 2 , wiring conductors are provided for electrically conducting the inside and outside of the substrate 2 . The wiring conductor is made of a conductive material such as tungsten, molybdenum, manganese or copper. When the substrate 2 is made of a ceramic material, for example, a metal paste obtained by adding an organic solvent to a powder of tungsten or the like is printed in a predetermined pattern on the ceramic green sheet serving as the substrate 2, and a plurality of ceramic green sheets are laminated. and sintering. A plating layer of, for example, nickel or gold is formed on the surface of the wiring conductor to prevent oxidation. In addition, on the upper surface of the substrate 2, in order to efficiently reflect the light above the substrate 2, a metal reflective layer such as aluminum, silver, gold, copper, or platinum is provided with a space between the wiring conductor and the plating layer. may be formed.

Light emitting element 3 is mounted on the main surface of substrate 2 . The light emitting element 3 is electrically connected to a plated layer deposited on the surface of the wiring conductor formed on the main surface of the substrate 2 via, for example, brazing material or solder. The light emitting element 3 has a translucent substrate and an optical semiconductor layer formed on the translucent substrate. The translucent substrate may be any substrate on which an optical semiconductor layer can be grown using a chemical vapor deposition method such as an organometallic vapor phase epitaxy method or a molecular beam epitaxial growth method. Sapphire, gallium nitride, aluminum nitride, zinc oxide, zinc selenide, silicon carbide, silicon, zirconium diboride, or the like can be used as the material used for the translucent substrate. The thickness of the translucent substrate is, for example, 50 μm or more and 1000 μm or less.

The optical semiconductor layer is composed of a first semiconductor layer formed on the translucent substrate, a light-emitting layer formed on the first semiconductor layer, and a second semiconductor layer formed on the light-emitting layer. . The first semiconductor layer, the light emitting layer and the second semiconductor layer are, for example, group III nitride semiconductors, group III-V semiconductors such as gallium phosphide or gallium arsenide, or group III nitrides such as gallium nitride, aluminum nitride or indium nitride. A material semiconductor or the like can be used. The thickness of the first semiconductor layer is, for example, 1 μm or more and 5 μm or less, the thickness of the light emitting layer is, for example, 25 nm or more and 150 nm or less, and the thickness of the second semiconductor layer is, for example, 50 nm or more and 600 nm or less. Moreover, the light emitting element 3 configured in this manner can emit excitation light in a wavelength range of, for example, 370 nm or more and 420 nm or less.

The frame 4 is made of, for example, a ceramic material such as aluminum oxide, titanium oxide, zirconium oxide or yttrium oxide, or a porous material, or a powder made of a metal oxide such as aluminum oxide, titanium oxide, zirconium oxide or yttrium oxide. made of resin material. The frame 4 is connected to the main surface of the substrate 2 via, for example, resin, brazing material, or solder. The frame 4 is provided on the main surface of the substrate 2 so as to surround the light emitting element 3 while being spaced apart from the light emitting element 3 . Further, the frame body 4 is formed such that the inclined inner wall surface widens outward as the distance from the main surface of the substrate 2 increases. The inner wall surface of the frame 4 functions as a reflecting surface for excitation light emitted from the light emitting element 3 . When the inner wall surface of the frame 4 is circular in plan view, the light emitted from the light emitting element 3 can be uniformly reflected outward by the reflecting surface.

In addition, the inclined inner wall surface of the frame 4 is composed of, for example, a metal layer made of tungsten, molybdenum, manganese, etc. on the inner peripheral surface of the frame 4 made of a sintered material, and nickel, gold, etc. covering the metal layer. A plated layer may be formed. This plated layer has a function of reflecting the light emitted by the light emitting element 3 . The inclination angle of the inner wall surface of the frame 4 is set to an angle of, for example, 55 degrees or more and 70 degrees or less with respect to the main surface of the substrate 2 .

An inner space surrounded by the substrate 2 and the frame 4 is filled with a light-transmitting sealing member 5 . The sealing member 5 seals the light emitting element 3 and extracts the light emitted from the inside of the light emitting element 3 to the outside. Further, it has a function of transmitting the light extracted to the outside of the light emitting element 3 . The sealing member 5 fills the inner space surrounded by the substrate 2 and the frame 4 while leaving a part of the space surrounded by the frame 4 . For the sealing member 5, for example, translucent insulating resin such as silicone resin, acrylic resin, or epoxy resin, or translucent glass material is used. The refractive index of the sealing member 5 is set to, for example, 1.4 or more and 1.6 or less.

The wavelength conversion member 6 is provided along the upper surface of the sealing member 5 above the inner space surrounded by the substrate 2 and the frame 4 . The wavelength conversion member 6 is formed so as to be accommodated within the frame 4 . The wavelength conversion member 6 has a function of converting the wavelength of light emitted by the light emitting element 3 . That is, the light emitted from the light emitting element 3 enters the wavelength conversion member 6 through the sealing member 5 , and the phosphor contained therein is excited by the light emitted from the light emitting element 3 to emit fluorescence. It emits fluorescence from the body and transmits and radiates part of the light from the light emitting element 3 . The wavelength conversion member 6 is made of, for example, a translucent insulating resin such as fluorine resin, silicone resin, acrylic resin, or epoxy resin, or a translucent glass material, and the insulating resin or glass material contains a phosphor. contained. The phosphor is uniformly dispersed in the wavelength conversion member 6. As shown in FIG.

The phosphors contained in the light emitting element 3 and the wavelength conversion member 6 are selected so that the emission spectrum of the light emitted from the light emitting device 1 exhibits light in the visible light range.

By adjusting the phosphor, the light-emitting device 1 according to the embodiment of the present invention can emit light with a high color rendering property that approximates the spectrum of sunlight. That is, the difference between the relative light intensity in the spectrum of sunlight and the relative light intensity in the emission spectrum of the light emitting device 1 according to the embodiment of the present invention can be reduced, and the light emitting device 1 that approximates sunlight can be manufactured. can also By combining phosphors or combining a plurality of light emitting devices 1 that emit light in different regions, the lighting device 10 described later can emit various kinds of light other than light that approximates sunlight. can. For example, the three types of RGB can be caused to emit light from different light emitting devices 1, respectively. The RGB are so-called three primary colors of light, and white light is obtained by combining R (red), G (green), and B (blue). In this case also, since the light-emitting elements 3 are the same, only the type of phosphor of each light-emitting device 1 is controlled. Therefore, the illumination device 10 does not require a voltage conversion device. Therefore, the illumination device 10 can be made smaller, which is effective in reducing power consumption. An example of a lighting device 10 including the light emitting device 1 according to this embodiment will be described below with reference to the accompanying drawings.

<Structure of lighting device>
FIG. 6 is a circuit diagram showing the lighting device and lighting module of this embodiment. FIG. 7 is an external perspective view of a lighting device provided with a light emitting device according to this embodiment, and FIG. 8 is an exploded perspective view of the lighting device shown in FIG. 9 is a perspective view showing a state in which the translucent substrate is removed from the housing of the lighting device shown in FIG. 7. FIG.

The illumination device 10 includes a long housing 30 that opens upward, and a plurality of light emitting devices 1 (a first light emitting device 11 and a second light emitting device 11) arranged in a line in the housing 30 along the longitudinal direction. 12), a long wiring board 40 on which a plurality of light emitting devices 1 are mounted, and a long translucent board 50 that is supported by the housing 30 and closes the opening of the housing 30. .

The housing 30 has a function of holding the translucent substrate 50 and a function of dissipating the heat generated by the light emitting device 1 to the outside. The housing 30 is made of, for example, metal such as aluminum, copper or stainless steel, plastic or resin. The housing 30 has a bottom portion 61a extending in the longitudinal direction, and a pair of support portions 61b erected from both ends in the width direction of the bottom portion 61a and extending in the longitudinal direction. It is composed of an elongated body portion 61 and two lid portions 62 that respectively close openings on one side and the other side in the longitudinal direction of the body portion 61 . In the upper part inside the housing 30 of each support part 61b, a holding part is provided in which recesses for holding the translucent substrate 50 are formed so as to face each other along the longitudinal direction. The length of the housing 30 in the longitudinal direction is set to, for example, 100 mm or more and 2000 mm or less.

The wiring board 40 is fixed to the bottom surface inside the housing 30 . As the wiring board 40, for example, a printed board such as a rigid board, a flexible board, or a rigid flexible board is used. The wiring pattern of the wiring board 40 and the wiring pattern of the substrate 2 in the light emitting device 1 are electrically connected via solder or a conductive adhesive. A signal from the wiring substrate 40 is transmitted to the light emitting element 3 through the substrate 2, and the light emitting element 3 emits light. Power is supplied to the wiring board 40 from an externally provided power source through wiring.

The light-transmitting substrate 50 is made of a material through which light emitted from the light-emitting device 1 is transmitted, and is made of a light-transmitting material such as acrylic resin or glass, for example. The translucent substrate 50 is a rectangular plate, and the length in the longitudinal direction is set to, for example, 98 mm or more and 1998 mm or less. The translucent substrate 50 is inserted into the recesses formed in the support portions 61b through the openings on one side or the other in the longitudinal direction of the main body portion 61, and is slid along the longitudinal direction to form a plurality of substrates. are supported by a pair of support portions 61b at a position spaced apart from the light emitting device 1. As shown in FIG. The illumination device 10 is configured by closing the openings on one side and the other side in the longitudinal direction of the body portion 61 with the lid portion 62 .

Although the lighting device 10 described above is a linear light emitting lighting device in which a plurality of light emitting devices 1 are arranged in a straight line, the present invention is not limited to this, and a surface in which a plurality of light emitting devices 1 are arranged in a matrix or a houndstooth pattern. It may be a lighting device that emits light.

The light-emitting device 1 includes, for example, a phosphor that emits blue fluorescence, a phosphor that emits blue-green fluorescence, and a phosphor that emits green fluorescence, as phosphors contained in one wavelength conversion member 6. The configuration may include three types of phosphors, or may include only one type of phosphor. By combining the types of phosphors arranged in the wavelength conversion member, the color of the emitted light can be controlled.

In the lighting device 10 according to the embodiment of the present invention, the light emitting device 1 is configured as described above. 12. The first light emitting device 11 has, for example, a first light emitting element 31 mounted inside, and a first phosphor 21 positioned within the wavelength conversion member 6 covering the first light emitting element 31 . It also emits light in the visible light range. The second light emitting device 12 has a second light emitting element 32 mounted inside and a second phosphor 22 positioned within the wavelength conversion member 6 covering the second light emitting element 32 . It also emits light in the visible light range.

At this time, the phosphor dispersed in the wavelength conversion member 6 in the first light emitting device 11 is, for example, the first phosphor 21, which is excited by the first light emitting element 31 and emitted from the first phosphor 21. , visible light is emitted from the first light emitting device 11 . At this time, the emitted light may be visible light, and may be white by combining a plurality of phosphors, or may be blue, green, red, etc. by using only one type of phosphor. Further, the phosphor dispersed in the wavelength conversion member 6 in the second light emitting device 12 is, for example, the second phosphor 22, which is excited by the second light emitting element 32 and emitted from the second phosphor 22, Visible light is emitted from the second light emitting device 12 . At this time, the emitted light may be visible light, and may be white by combining a plurality of phosphors, or may be blue, green, red, etc. by using only one type of phosphor. Further, the first light emitting device 11 and the second light emitting device 12 may emit light of the same color, or may emit light of different colors.

The first light emitting element 31 and the second light emitting element 32 have peak wavelengths of 350 nm to 460 nm. At this time, the first light emitting element 31 and the second light emitting element 32 preferably have the same emission spectrum.

Moreover, the illumination device 10 may further include a third light emitting device 13 . The third light emitting device 13 has a third light emitting element 33 mounted inside, and a third phosphor 23 positioned within the wavelength conversion member 6 covering the third light emitting element 33 . It also emits light in the visible light range. The phosphor dispersed in the wavelength conversion member 6 in the third light-emitting device 13 is, for example, the third phosphor 23, which is excited by the third light-emitting element 33 and emitted from the third phosphor 23 to produce the third Visible light is emitted from the light emitting device 13 . At this time, the radiated light may be visible light, and may be white by combining a plurality of phosphors, or may be blue, green, red, etc. by using only one type of phosphor. In addition, the third light emitting device 13 may emit light of the same color as the first light emitting device 11 and the second light emitting device 12, or may emit light of a different color as long as it is visible light.

Also, the third light emitting element 33 has a peak wavelength of 350 nm to 460 nm. At this time, the third light emitting element 33 preferably has the same emission spectrum as the first light emitting element 31 and the second light emitting element 32 .

_{Each phosphor differs} depending on the color _{it emits . 10} (PO ₄ ) ₆ Cl ₂ :Eu, and the phosphor showing bluish green is (Sr, Ba, Ca) ₅ (PO ₄ ) ₃ Cl:Eu, Sr ₄ Al ₁₄ O ₂₅ :Eu. The third phosphor 13 showing green is _SrSi2 (O,Cl) _2N2 :Eu, (Sr,Ba,Mg) _2SiO4 :Eu2 ₊ ^, ZnS: _Cu ,Al, _Zn2SiO4 : _Mn . be. Y ₂ O ₂ S:Eu, Y ₂ O ₃ :Eu, SrCaClAlSiN ₃ :Eu ²⁺ , CaAlSiN ₃ :Eu, and CaAlSi(ON) ₃ :Eu are used as phosphors showing red.

As described above, the first light emitting element 31 and the second light emitting element 32 have the same emission spectrum and can be driven with the same voltage. Therefore, the circuit configuration can be simplified, and since the first light emitting element 31 and the second light emitting element 32 have the same potential, a voltage conversion device for driving the second light emitting element 32 is not required. . As a result, the first light emitting device 11 and the second light emitting device 12 are at the same potential. Since the voltage conversion device is not required, it is possible to reduce the size and power consumption of the lighting device 10 .

Since the lighting device 10 according to the embodiment of the present invention has the above-described configuration, the circuit configuration can be simplified. A voltage conversion device becomes unnecessary. Since the voltage conversion device is not required, it is possible to reduce the size and power consumption of the lighting device 10 .

Furthermore, as described above, the third light emitting element 33 has the same emission spectrum as the first light emitting element 31 and the second light emitting element 32, and the same voltage as the first light emitting element 31 and the second light emitting element 32. can be driven. As a result, the circuit configuration can be further simplified, and the third light emitting element 33 has the same potential as the first light emitting element 31 and the second light emitting element 32. A voltage conversion device becomes unnecessary. Since the voltage conversion device is not required, it is possible to reduce the size and power consumption of the lighting device 10 .

In the case of three types of light-emitting devices, each visible light may be white light, or may be three types of RGB. If the colors are different, the type of phosphor may be adjusted.

Although three types of light-emitting devices have been described above, lighting device 10 may be composed of more types of light-emitting devices. Also in this case, all the light emitting elements have the same emission spectrum and can be driven with the same voltage. Therefore, the circuit configuration can be further simplified, and the condition that the voltage conversion device is not required is satisfied. Since the voltage conversion device is not required, it is possible to reduce the size and power consumption of the lighting device 10 .

<Structure of Lighting Module>
The lighting module 100 according to the embodiment of the present invention includes the lighting device 10 described above and a control circuit 20 that is electrically connected to the lighting device 10 and controls the light of the lighting device 10 . The control circuit 20 is a CPU, and may be integrated with the lighting device 10 positioned within the wiring substrate 40 of the lighting device 10, or may be arranged outside the lighting device.

The present invention is not limited to the examples of the embodiments described above, and various modifications such as numerical values are possible. Various combinations of features in this embodiment are not limited to the examples of the embodiments described above.

1 Light emitting device 11 First light emitting device 12 Second light emitting device 13 Third light emitting device 21 First phosphor 22 Second phosphor 23 Third phosphor 31 First light emitting element 32 Second light emitting element 23 Third light emitting element 2 Substrate 3 Light emitting element 4 Frame 5 Sealing member 6 Wavelength conversion member 10 Lighting device 20 Control circuit 30 Housing 40 Wiring board 50 Translucent board 100 Lighting module

Claims (9)

A first light emitting element mounted inside that emits excitation light in a wavelength range with a peak wavelength of 370 nm or more and 420 nm or less, and at least a red phosphor, a green phosphor, or a blue phosphor that covers the first light emitting element a first light-emitting device that has a first phosphor containing one type and emits light in the visible light range;
A second light emitting element mounted inside, emitting excitation light having a peak wavelength in a wavelength range of 370 nm or more and 420 nm or less, having the same emission spectrum as the first light emitting element, and emitting light at the same potential as the first light emitting element and a second phosphor containing at least one of a red phosphor, a green phosphor, and a blue phosphor, covering the second light emitting element , and emitting light in the visible light range , and a second light emitting device that is positioned separately and independently from the light emitting device. 2. The illumination device according to claim 1, wherein said first light emitting element and said second light emitting element have peak wavelengths in a wavelength range of 350 nm or more and 460 nm or less. 3. The lighting device according to claim 1, wherein the visible light range emitted from the first light emitting device and the visible light range emitted from the second light emitting device are different. A third light emitting element mounted inside and emitting light at the same potential as the first light emitting element and the second light emitting element, and a third phosphor covering the third light emitting element, and light in the visible light range 4. The illumination device according to any one of claims 1 to 3 , further comprising a third light-emitting device that emits a . The first phosphor contains at least a red phosphor,
The second phosphor contains at least a green phosphor,
5. The lighting device according to claim 4 , wherein the third phosphor contains at least a blue phosphor . 6. The illumination device according to claim 4 , wherein the third light emitting element has a peak wavelength in a wavelength range of 350 nm or more and 460 nm or less. The visible light range emitted from the third light emitting device is different from the visible light range emitted from the first light emitting device and the visible light range emitted from the second light emitting device . 7. The lighting device according to any one of 6 . The lighting device according to any one of claims 4 to 7, wherein the first light emitting element, the second light emitting element and the third light emitting element all have the same emission spectrum. a lighting device according to any one of claims 1 to 8;
A lighting module comprising a control circuit electrically connected to the lighting device.

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