Source: https://patents.google.com/patent/JP6203147B2/en
Timestamp: 2020-01-18 11:18:40
Document Index: 777718772

Matched Legal Cases: ['art, 2', 'art 12', 'art 1', 'art 2', 'art 1', 'art 2', 'art 1', 'art 2', 'art 1', 'art 2', 'art 2', 'art 14', 'art 1', 'art 1', 'art 2', 'art 2', 'art 12', 'art 14']

JP6203147B2 - Light emitting device - Google Patents
JP6203147B2
JP6203147B2 JP2014162407A JP2014162407A JP6203147B2 JP 6203147 B2 JP6203147 B2 JP 6203147B2 JP 2014162407 A JP2014162407 A JP 2014162407A JP 2014162407 A JP2014162407 A JP 2014162407A JP 6203147 B2 JP6203147 B2 JP 6203147B2
JP2014162407A
JP2015201614A (en
金子　延容
延容 金子
英賀谷　誠
幡　俊雄
修 地主
ナヴィーン ベンカタ ラマ デビセッティ
金子　和昭
和昭 金子
宏彰 大沼
2014-01-29 Priority to JP2014014234 priority Critical
2014-01-29 Priority to JP2014014234 priority
2014-03-31 Priority to JP2014072338 priority
2014-08-08 Application filed by シャープ株式会社 filed Critical シャープ株式会社
2014-08-08 Priority to JP2014162407A priority patent/JP6203147B2/en
2015-11-12 Publication of JP2015201614A publication Critical patent/JP2015201614A/en
2017-09-27 Publication of JP6203147B2 publication Critical patent/JP6203147B2/en
The present invention relates to a light emitting device, and more particularly to a light emitting device capable of adjusting a color temperature.
Halogen lamps are very close to the energy distribution of a perfect radiator, and therefore exhibit excellent color rendering. Furthermore, since the color temperature of the light emitted from the halogen lamp can be changed depending on the magnitude of the power supplied to the halogen lamp (see FIG. 14), it is used as a visible light source. However, the halogen lamp emits infrared rays, so it has a very high temperature, requires a reflector for preventing infrared radiation, has a short life compared to LEDs, and consumes a large amount of power. there were. Therefore, development of a white light emitting device using a light emitting diode (LED) that generates less heat and has a longer life is being carried out.
Patent Document 1 (Japanese Patent Application Laid-Open No. 2009-224656) discloses a base having a recess formed with a plurality of inclined surfaces inclined in directions opposite to each other on a bottom surface, and a light emitting element installed on each of the inclined surfaces. There is disclosed a light emitting device including a wavelength conversion member provided so as to cover each of the light emitting elements and converting light emitted from each of the light emitting elements into light having different wavelengths.
Patent Document 2 (Japanese Patent Application Laid-Open No. 2011-159809) discloses a first white light generation system that includes a UV or purple LED chip and a phosphor to generate first white light, a blue LED chip, and a phosphor. And a second white light generation system for generating second white light, wherein the first and second white light generation systems are spatially separated, and the first white light is A white light emitting device having a color temperature lower than that of the white light 2 and configured to emit mixed light including the first white light and the second white light is disclosed.
The techniques of Patent Literature 1 and Patent Literature 2 supply power from different power sources to each light emitting element, which requires a plurality of wiring patterns and has a problem in that the structure of the light emitting device is complicated.
JP 2009-224656 A JP 2011-159809 A
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a light-emitting device capable of adjusting a color temperature by supplying power from a single power source. .
The present invention includes an anode electrode land, a cathode electrode land, a first wiring and a second wiring connecting the anode electrode land and the cathode electrode land, and the electrical resistance of the first wiring is The entire light emitting unit emits light, including a first light emitting unit electrically connected to the first wiring and a second light emitting unit electrically connected to the second wiring, which is greater than the electrical resistance of the second wiring. The light emitting device is characterized in that the color temperature of light can be adjusted.
In the light emitting device of the present invention, preferably, the first light emitting unit and the second light emitting unit each include an LED element, a translucent resin, and at least two kinds of phosphors.
In the light emitting device of the present invention, preferably, the first wiring includes a resistor.
In the light emitting device of the present invention, preferably, the first light emitting unit and the second light emitting unit are arranged so that the light emitted from each of the first light emitting unit and the second light emitting unit can be mixed.
In the light emitting device of the present invention, preferably, the content of the phosphor included in the first light emitting unit is different from the content of the phosphor included in the second light emitting unit.
In the light emitting device of the present invention, preferably, the light emitting device includes a plurality of first light emitting units and a plurality of second light emitting units, and the plurality of first light emitting units are connected in series on the first wiring, The second light emitting units are connected in series on the second wiring, and each of the plurality of first light emitting units and the plurality of second light emitting units includes an LED element, a translucent resin, and at least two kinds of phosphors. including.
The present invention includes a substrate, an anode electrode land disposed on the substrate, a cathode electrode land, and a first wiring and a second wiring connecting the anode electrode land and the cathode electrode land. The light emitting device includes a first wiring having an electrical resistance greater than that of the second wiring, and is electrically connected to the first light emitting unit and the second wiring electrically connected to the first wiring. The color temperature of light emitted from the entire light emitting unit including the second light emitting unit connected to the light source can be adjusted, and the light emitting device further emits light including the first light emitting unit and the second light emitting unit on the substrate. A light emitting device is provided that includes a resin dam surrounding the entire portion, and one of the first light emitting portion and the second light emitting portion covers at least a part of the resin dam.
In the light emitting device of the present invention, preferably, the height of the light emitting part covering at least a part of the resin dam is higher than the height of the other light emitting part.
According to the present invention, it is possible to obtain a light emitting device capable of adjusting a color temperature by supplying power from a single power source.
It is a top view which shows typically the light-emitting device which concerns on Embodiment 1 of this invention. FIG. 2 is a perspective view of the light emitting device of FIG. 1. It is a top view which shows typically the light-emitting device which concerns on Embodiment 2 of this invention. FIG. 4 is a perspective view of the light emitting device of FIG. 3. It is the sectional view on the AA line of the light-emitting device of FIG. FIG. 6A is a graph showing the relationship between the relative luminous flux of light emitted from the light emitting device and the color temperature. FIG. 6B is a diagram illustrating a spectrum of light emitted from the light emitting device. It is a top view which shows typically the light-emitting device which concerns on Embodiment 3 of this invention. FIG. 8 is a perspective view of the light emitting device of FIG. 7. It is a top view which shows typically the light-emitting device which concerns on Embodiment 4 of this invention. FIG. 10 is a perspective view of the light emitting device of FIG. 9. It is a perspective view of the modification of the light-emitting device concerning Embodiment 4 of this invention. It is a top view which shows typically the light-emitting device which concerns on Embodiment 5 of this invention. FIG. 13 is a perspective view of the light emitting device of FIG. 12. It is a graph which shows the relationship between the relative luminous flux of the light which a halogen lamp emits, and color temperature. It is a top view which shows typically the light-emitting device which concerns on Embodiment 6 of this invention. FIG. 16 is a perspective view of the light emitting device of FIG. 15. It is a top view which shows the modification of the light-emitting device which concerns on Embodiment 6 of this invention. FIG. 18 is a perspective view of the light emitting device of FIG. 17. It is a schematic diagram which shows an example of a reflector. It is a top view which shows typically the light-emitting device which concerns on Embodiment 7 of this invention. It is a plane perspective view of the light-emitting device which concerns on Embodiment 8 of this invention. It is a top view which shows typically the light-emitting device which concerns on Embodiment 9 of this invention. It is a schematic diagram which shows an example of a variable resistance. In Example 5, the color of light emitted by each light emitting device as a whole in a low current region (100 mA) or a high current region (700 mA) when the wire of the first light emitting unit of each light emitting device is connected to a wiring pattern of 30Ω. It is a figure which shows degree distribution. In Example 5, the entire light emitting device in the low current region (100 mA) or the high current region (700 mA) when the wire of the first light emitting unit of each light emitting device is connected to the wiring pattern having different resistance values. It is a figure which shows chromaticity distribution of the light to emit.
Hereinafter, the light emitting device of the present invention will be described with reference to the drawings. In the drawings of the present invention, the same reference numerals represent the same or corresponding parts. In addition, dimensional relationships such as length, width, thickness, and depth are changed as appropriate for clarity and simplification of the drawings, and do not represent actual dimensional relationships.
FIG. 1 is a plan view schematically showing a light emitting device according to Embodiment 1 of the present invention, and FIG. 2 is a perspective view of FIG.
In FIG. 1, the light emitting device 6 includes an anode electrode land 21, a cathode electrode land 20, and a first wiring k 1 that connects the anode electrode land 21 and the cathode electrode land 20. And a second wiring k2. The electric resistance of the first wiring is larger than the electric resistance of the second wiring. The light emitting unit 12 includes a first light emitting unit 1 electrically connected to the first wiring and a second light emitting unit 2 electrically connected to the second wiring. A resistor 80 is connected to the first wiring k1. The color temperature of the light emitted from the entire light emitting unit 12 including the first light emitting unit and the second light emitting unit can be adjusted.
In FIG. 2, the first light emitting unit 1 includes a second red phosphor 61, a green phosphor 70, an LED element 30, and a translucent resin, and the second light emitting unit 2 includes the first red phosphor 60, the first 2 red fluorescent substance 61, green fluorescent substance 70, LED element 30, and translucent resin are included. The anode electrode land 21, the plurality of LED elements 30, and the cathode electrode land 20 are electrically connected by wires.
In the light emitting device 6, the first light emitting unit 1 and the second light emitting unit 2 emit light by supplying power from a single power source. The light emitted from the first light emitting unit 1 and the light emitted from the second light emitting unit 2 are mixed and emitted to the outside as light from the light emitting device 3.
When the ratio of the current flowing to the first light emitting unit 1 and the second light emitting unit 2 is changed, the color temperature of the light emitted from the first light emitting unit 1 and the second light emitting unit 2 does not change, but the luminous flux of each light emitting unit The ratio changes. Therefore, it is possible to change the color temperature of the light from the entire light emitting unit 12, which is a mixed light of the light emitted from the first light emitting unit 1 and the second light emitting unit 2.
(Anode electrode land, cathode electrode land, first wiring, second wiring, substrate)
The first wiring and the second wiring are arranged in parallel so as to connect the anode electrode land and the cathode electrode land, respectively. The first wiring and the second wiring are formed on the substrate by a screen printing method or the like. A protection element may be connected to at least one of the first wiring and the second wiring.
The electrode land is an electrode for external connection (for example, power supply application), is made of Ag-Pt or the like, and is formed by a screen printing method or the like.
The red phosphor is excited by the primary light emitted from the LED element, and emits light having a peak emission wavelength in the red region. The red phosphor does not emit light in the wavelength range of 700 nm or more and does not absorb light in the wavelength range of 550 nm to 600 nm. “The red phosphor does not emit light in the wavelength range of 700 nm or more” means that the emission intensity of the red phosphor in the wavelength range of 700 nm or more at a temperature of 300 K or more is 1 of the emission intensity of the red phosphor in the peak emission wavelength. / 100 times or less. “The red phosphor has no light absorption within the wavelength range of 550 nm to 600 nm” means that the integral value of the excitation spectrum of the red phosphor within the wavelength range of 550 nm to 600 nm is the red fluorescence at a temperature of 300 K or more. It means that the body is 1/100 times or less of the integral value of the excitation spectrum in the wavelength range of 430 nm or more and 480 nm or less. Note that the measurement wavelength of the excitation spectrum is the peak wavelength of the red phosphor. In this specification, the “red region” means a region having a wavelength of 580 nm or more and less than 700 nm.
The light emission of the red phosphor can hardly be confirmed in a long wavelength region of 700 nm or more. In the long wavelength region of 700 nm or more, human visibility is relatively small. Therefore, when the light emitting device is used for lighting, for example, it is very advantageous to use a red phosphor.
Further, since the red phosphor does not absorb light within the wavelength range of 550 nm to 600 nm, it is difficult to absorb the secondary light from the green phosphor. Therefore, it is possible to prevent the two-step emission in which the red phosphor absorbs the secondary light from the green phosphor and emits light. Therefore, the luminous efficiency is kept high.
The red phosphor is not particularly limited as long as it is used in the wavelength conversion section of the light emitting device. For example, (Sr, Ca) AlSiN 3 : Eu-based phosphor, CaAlSiN 3 : Eu-based phosphor, or the like is used. it can.
(Green phosphor)
The green phosphor is excited by the primary light emitted from the LED element, and emits light having a peak emission wavelength in the green region. Green phosphor is not particularly limited as long as it is used in the wavelength converting portion of the light emitting device, for example, the general formula (1) :( M1) 3- x Ce x (M2) 5 O 12 ( wherein, ( M1) represents at least one of Y, Lu, Gd and La, (M2) represents at least one of Al and Ga, and x representing the composition ratio (concentration) of Ce is 0.005 ≦ phosphor satisfying x ≦ 0.20) can be used. “Green region” means a region having a wavelength of 500 nm or more and 580 nm or less.
The half width of the fluorescence spectrum of the green phosphor is preferably wider when one type of green phosphor is used (for example, in general lighting applications), and is preferably 95 nm or more, for example. Phosphor of Ce and activator, e.g. Lu 3-x Ce x Al 5 O 12 based green phosphor represented by general formula (1) has a garnet crystal structure. Since this phosphor uses Ce as an activator, a fluorescence spectrum having a wide half-value width (half-value width of 95 nm or more) is obtained. Therefore, the phosphor using Ce as an activator is a green phosphor suitable for obtaining high color rendering properties.
The LED element emits light having a peak emission wavelength within a wavelength range of 430 nm or more and 480 nm or less. When a light emitting element having a peak emission wavelength of less than 430 nm is used, the contribution ratio of the blue light component to the light from the light emitting device is lowered, leading to deterioration in color rendering, and thus a decrease in practicality of the light emitting device. May be invited. When an LED element having a peak emission wavelength exceeding 480 nm is used, the practicality of the light emitting device may be reduced. In particular, since the quantum efficiency of the InGaN-based LED element is lowered, the practical use of the light emitting device is significantly reduced.
The LED element is preferably an LED element that emits light containing light of a blue component having a peak emission wavelength in the blue region (region having a wavelength of 430 nm or more and 480 nm or less), and more preferably an InGaN-based LED device. is there. As an example of the LED element, an LED element having a peak emission wavelength in the vicinity of 450 nm can be exemplified. Here, the “InGaN-based LED element” means an LED element whose light emitting layer is an InGaN layer.
The LED element has a structure in which light is emitted from its upper surface. Further, the LED element has electrode pads (not shown, for example, an anode electrode pad) for connecting adjacent LED elements to each other via a wire and connecting the LED element and the wiring pattern on the surface. And electrode pad for cathode).
(1st light emission part, 2nd light emission part)
The first light-emitting part and the second light-emitting part (hereinafter also referred to as “light-emitting part”) include a translucent resin, a green phosphor and a red phosphor uniformly dispersed in the translucent resin And a phosphor.
In FIG. 1, the 1st light emission part and the 2nd light emission part are arrange | positioned inside the same circle | round | yen. A first light emitting unit 1 is arranged in a first section obtained by dividing the circle into two by a straight line passing through the center of the circle, and a second light emitting unit 2 is arranged in the second section. In FIG. 1, since the first light emitting unit 1 and the second light emitting unit 2 are adjacent to each other at the boundary line, the light emitted from the respective light emitting units of the first light emitting unit 1 and the second light emitting unit 2 is emitted. It becomes easy to mix and the light emission part 12 whole can emit the light of a more uniform color temperature. In addition, although it is preferable that the 1st light emission part 1 and the 2nd light emission part 2 are arrange | positioned adjacently, the light which each light emission part of a 1st light emission part and a 2nd light emission part mixes. If possible, the first light-emitting portion and the second light-emitting portion do not necessarily have to be in contact with each other. In this case, it is preferable that the first light emitting unit and the second light emitting unit are disposed at a distance close to the extent that the light emitted from each light emitting unit can be sufficiently mixed.
If the shape of the whole light emitting part including the first light emitting part and the second light emitting part is a shape in which the light emitted from the respective light emitting parts of the first light emitting part and the second light emitting part can be mixed, It is not limited to a circle as shown in FIG. For example, an arbitrary shape such as a substantially rectangular shape, a substantially elliptical shape, or a polygonal shape can be adopted as the shape of the entire light emitting unit. The shape of each of the first light emitting unit and the second light emitting unit disposed inside the entire light emitting unit is not particularly limited. For example, it is preferable that the first light emitting unit and the second light emitting unit have the same surface area. Such a shape is obtained, for example, by arranging the first light emitting part in the first section obtained by equally dividing the entire light emitting part by a line passing through the center, and the second section in the second section. It can be obtained by arranging the light emitting part. Note that the surface areas of the first light emitting unit and the second light emitting unit are different from each other if the color temperature of the light emitted from each of the first light emitting unit and the second light emitting unit can be adjusted. Also good. The first light emitting unit and the second light emitting unit are preferably disposed adjacent to each other, but if the light emitted from the light emitting units of the first light emitting unit and the second light emitting unit can be mixed, The first light emitting unit and the second light emitting unit do not necessarily have to be in contact with each other.
The arrangement of the first light emitting unit and the second light emitting unit is not particularly limited as long as the light emitted from the respective light emitting units of the first light emitting unit and the second light emitting unit can be mixed. For example, the first light-emitting part can be formed in a circular shape, and the second light-emitting part can be arranged in a donut shape so as to surround the outer periphery of the first light-emitting part. According to this, the light emitted from the respective light emitting units of the first light emitting unit and the second light emitting unit can be easily mixed, and the entire light emitting unit can emit light with a more uniform color temperature. The first light emitting unit and the second light emitting unit are preferably disposed adjacent to each other, but if the light emitted from the light emitting units of the first light emitting unit and the second light emitting unit can be mixed, The first light emitting unit and the second light emitting unit do not necessarily have to be in contact with each other.
In the light emitting unit, a part of primary light (for example, blue light) emitted from the LED element is converted into green light and red light. Therefore, the light emitting device according to the present embodiment emits light in which the primary light, green light, and red light are mixed, and preferably emits white light. In addition, the mixing ratio in particular of green fluorescent substance and red fluorescent substance is not restrict | limited, It is preferable to set a mixing ratio so that it may become a desired characteristic.
The translucent resin contained in the light emitting part is not limited as long as it is a translucent resin, and is preferably an epoxy resin, a silicone resin, a urea resin, or the like. The light emitting part may contain additives such as SiO 2 , TiO 2 , ZrO 2 , Al 2 O 3 or Y 2 O 3 in addition to the translucent resin, the green phosphor and the red phosphor. . If the light emitting part contains such an additive, the effect of preventing sedimentation of phosphors such as the green phosphor and the red phosphor, or the light from the LED element, the green phosphor and the red phosphor can be efficiently performed. The effect of diffusing can be obtained.
By changing the magnitude of the current flowing through each of the first wiring and the second wiring, it is possible to adjust the light beam emitted from the first light emitting unit and the light beam emitted from the second light emitting unit. .
In the case of the rated current value, the color temperature (hereinafter also referred to as Tc max ) of the light emitted by the entire light emitting device in which the light emitted from the first light emitting unit and the light emitted from the second light emitting unit are mixed is 2700K to 6500K. It is preferable that When the magnitude of the current is smaller than the rated current value, the light flux emitted from the first light emitting unit and the second light emitting unit is reduced, the light flux emitted from the entire light emitting device (light emitting unit) is reduced, and the color temperature is reduced. Decreases. When the rated current value is set, the light flux emitted from the entire light emitting device is set to 100%, and the light emitted from the entire light emitting device is adjusted to 20% by reducing the magnitude of the current to 20%. The color temperature is preferably 300 K or more lower than Tc max from the viewpoint of obtaining a wide range of color temperatures.
A resistor is connected in series to the first wiring. By changing the magnitude of the resistance, the magnitude of the current flowing through the first wiring and the second wiring can be adjusted. With the change in the magnitude of the current flowing through the first wiring and the second wiring, the luminous flux of the light emitted from the LED element connected to the first wiring or the second wiring also changes, and the first light emitting unit and The luminous flux of the light emitted from the second light emitting unit also changes. When the luminous flux of the light emitted from the light emitting portion changes, the color temperature of the light also changes. Therefore, the color temperature of the light emitted from the entire light emitting device can be adjusted by changing the magnitude of the resistance.
As the resistor, a chip resistor or a printed resistor can be used.
In the first embodiment, the resistor is connected only to the first wiring, but the resistor may be connected to the second wiring. In this case, the resistance connected to each wiring is selected so that the resistance value of the first wiring is larger than the resistance value of the second wiring.
3 is a plan view schematically showing a light emitting device according to Embodiment 2 of the present invention, FIG. 4 is a perspective view of the light emitting device of FIG. 3, and FIG. 5 is an AA view of the light emitting device of FIG. It is line sectional drawing.
The light emitting device according to the present embodiment has the same configuration as the light emitting device according to Embodiment 1 as a basic configuration. The difference from the first embodiment is that the first light emitting unit 1 is arranged at two places, the second light emitting unit 2 is arranged at three places, the resin dam 40 is arranged around the light emitting part, That is, the resistance value monitoring land 22 is connected to one wiring, and the wire 90 is connected to the electrode land via the wiring patterns 50, 51 and 52.
The first wiring is electrically connected to each of the two first light emitting units 1, and the two first light emitting units 1 are arranged in parallel on the first wiring. The second wiring is electrically connected to each of the three second light emitting units 2, and the three second light emitting units 2 are arranged in parallel on the second wiring. When the number of the first light emitting units 1 and the second light emitting units 2 is increased and the first light emitting units 1 and the second light emitting units 2 are arranged so as to be alternately contacted, the first light emitting units 1 The light emitted from the light and the light emitted from the second light emitting unit 2 are easily mixed, and the light emitting device can emit light with a more uniform color temperature. In addition, although it is preferable that the 1st light emission part 1 and the 2nd light emission part 2 are arrange | positioned adjacently, the light which each light emission part of a 1st light emission part and a 2nd light emission part mixes is mixed. If possible, the first light-emitting portion and the second light-emitting portion do not necessarily have to be in contact with each other. In this case, it is preferable that the first light emitting unit and the second light emitting unit are disposed at a distance close to the extent that the light emitted from each light emitting unit can be sufficiently mixed.
The arrangement of the first light emitting unit and the second light emitting unit is not particularly limited as long as the light emitted from the respective light emitting units of the first light emitting unit and the second light emitting unit can be mixed. For example, after the first light emitting unit is formed in a circular shape, the second light emitting unit is formed in a donut shape so as to surround the outer periphery of the first light emitting unit, and further, the outer periphery of the second light emitting unit is surrounded. As described above, the entire light emitting unit in which the first light emitting unit and the second light emitting unit are arranged adjacent to each other, which is obtained by repeating the process of forming the first light emitting unit in a donut shape, is used for the light emitting device. it can.
Between the cathode electrode land 20 and the first light emitting unit 1, the resistor 80 and the resistance value monitoring land 22 are electrically connected. The resistor 80 is a chip resistor, which is separated from the cathode electrode land and the resistance value monitoring land, and does not hinder the soldering operation, so that the soldering is easy. The resistor 80 is preferably covered with a phosphor-containing resin or a colored resin.
The resin dam is a resin for damming the first light emitting part and the second light emitting part including the translucent resin, and colored material (white, milky white, red, yellow, green colored with little light absorption) It may be composed of a material). When the resin dam is formed so as to cover the wiring pattern, it is preferable for reducing absorption of light emitted from the LED element or light converted by the phosphor.
In FIG. 5, the first light emitting unit 1 and the second light emitting unit 2 are disposed inside the resin dam 40. The 1st light emission part 1 and the 2nd light emission part 2 can be formed in accordance with the method shown next. A green phosphor and a red phosphor are uniformly mixed in a translucent resin. The obtained mixed resin is injected into the inside of the resin dam and heat treatment is performed. By this heat treatment, the translucent resin is cured, and thus the green phosphor and the red phosphor are sealed.
The first light emitting unit 1 is preferably more thixotropic than the second light emitting unit 2. If the first light emitting unit 1 is more thixotropic than the second light emitting unit 2, the surface height of the first light emitting unit 1 is higher than that of the second light emitting unit 2 as shown in FIG. Become. Therefore, the 1st light emission part 1 can play the role of the resin dam of the 2nd light emission part 2. FIG. Furthermore, when the first light emitting unit 1 is more thixotropic than the second light emitting unit 2, mixing and mixing of phosphors and the like contained in each light emitting unit can be reduced.
FIG. 7 is a plan view schematically showing a light emitting device according to Embodiment 3 of the present invention, and FIG. 8 is a perspective view of the light emitting device of FIG.
The light emitting device according to the present embodiment has the same configuration as the light emitting device according to Embodiment 2 as a basic configuration. The difference from the second embodiment is that the resistors 280 and 281 are disposed between the wiring pattern 251 and the first light emitting unit 201, the resistors 280 and 281 are covered with the resin dam 240, That is, the first light emitting unit 201 and the second light emitting unit 202 are electrically connected to the same wiring pattern 251 and the resistance value monitoring land is not provided. When at least a part of the resistor is covered with the resin dam, light absorption by the resistor can be reduced, and the light emission efficiency of the light emitting device is improved. It is preferable that all of the resistor and the wiring pattern are covered with a resin dam.
FIG. 9 is a plan view schematically showing a light emitting device according to Embodiment 4 of the present invention, and FIG. 10 is a perspective view of the light emitting device of FIG.
The light emitting device according to the present embodiment has the same configuration as the light emitting device according to Embodiment 2 as a basic configuration. The difference from the second embodiment is that the anode electrode land 321, the resistor 381, and the wiring pattern 353 are electrically connected, and the resistors 380 and 381 are printing resistors and are not covered with the resin dam 340. The first light emitting unit 301 is electrically connected to the wiring pattern 353, the second light emitting unit 302 is electrically connected to the wiring pattern 354, and the resistance value monitoring land is not provided. is there. It is preferable to use a printing resistor for the resistance because it is easy to manufacture. If the height of the resistors 380 and 381 is lower than that of the resin dam 340, light absorption by the resistors can be reduced, and the light emission efficiency of the light emitting device is improved.
FIG. 11 is a perspective view of a modification of the light emitting device according to Embodiment 4 of the present invention. In this modification, a part of the resistors 480 and 481 and the wiring patterns 450, 451, 453, and 454 are all covered with the resin dam 440. When the resistor and the wiring pattern are covered with the resin dam 440, light absorption by the resistor can be reduced, and the light emission efficiency of the light emitting device is improved. It is preferable that all of the resistor and the wiring pattern are covered with the resin dam 440.
FIG. 12 is a plan view schematically showing the light emitting device according to Embodiment 5 of the present invention, and FIG. 13 is a perspective view of the light emitting device of FIG.
The light emitting device according to the present embodiment has the same configuration as the light emitting device according to Embodiment 2 as a basic configuration. The difference from Embodiment 2 is that the entire light emitting portion formed by the first light emitting portion 501 and the second light emitting portion 502 is rectangular when the light emitting device is viewed from above, and the resistor 580 is printed. It is a resistance and is covered with a resin dam 540, and a resistance value monitoring land is not installed. When the resistor is covered with the resin dam 540, light absorption due to the resistor can be reduced, and the light emission efficiency of the light emitting device is improved. It is preferable that all of the resistor and the wiring pattern are covered with the resin dam 540. In FIG. 12, the first light emitting unit 501 and the second light emitting unit 502 have a rectangular shape, and the short sides thereof are in contact with each other, but the long sides may be in contact with each other.
FIG. 15 is a plan view schematically showing the light emitting device according to Embodiment 6 of the present invention, and FIG. 16 is a perspective view of the light emitting device of FIG.
The light emitting device according to the present embodiment has the same configuration as the light emitting device according to Embodiment 1 as a basic configuration. The difference from the first embodiment is that five first light emitting portions 601 are connected in series on the first wiring k1, and five second light emitting portions 602 are on the second wiring k2. Are connected in series with each other, and the first light-emitting portion and the second light-emitting portion are not adjacent to each other, and are disposed at such a distance that the light emitted from each can be sufficiently mixed. It is.
Specifically, referring to FIG. 15, light emitting device 600 includes anode electrode land 621, cathode electrode land 620, anode electrode land 621, and cathode electrode land 620 disposed on substrate 610. Are provided with a first wiring k1 and a second wiring k2. The electric resistance of the first wiring is larger than the electric resistance of the second wiring. The light emitting unit 612 includes five first light emitting units 601 electrically connected in series on the first wiring k1 and five first light emitting units connected electrically in series on the second wiring k2. 2 light emitting units 602. A resistor 680 is connected to the first wiring k1. Since the first light emitting unit 601 and the second light emitting unit 602 are arranged at a distance close to the extent that the light emitted from each of them can be sufficiently mixed, the light emitted from the entire light emitting device has a uniform color temperature. Of light. As for the distance between the first light emitting part and the second light emitting part, the shortest distance between the outer edges of each light emitting part is preferably 28 mm or less, and more preferably 22 mm or less. When the distance between the first light emitting unit and the second light emitting unit is 28 mm or less, the light emitted from each of the first light emitting unit and the second light emitting unit can be sufficiently mixed.
Referring to FIG. 16, each of the plurality of first light emitting units 601 includes a second red phosphor 661, a green phosphor 670, an LED element 630, and a translucent resin, and includes a plurality of second light emitting units 602. Each includes a first red phosphor 660, a second red phosphor 661, a green phosphor 670, an LED element 630, and a translucent resin.
17 is a plan view of a modification of the light emitting device according to Embodiment 6 of the present invention, and FIG. 18 is a perspective view of the light emitting device of FIG. In the present modification, the first light emitting unit 701 and the second light emitting unit 702 are each disposed inside the reflector 703. Although the shape of the reflector 703 is not particularly limited, for example, a shape obtained by hollowing out the inside of a rectangular parallelepiped as shown in FIG. 19 can be used. Further, instead of the reflector, a wall surrounding each of the first light emitting unit 701 and the second light emitting unit 702 can be formed.
In the present modification, the distance between the first light emitting part and the second light emitting part is preferably such that the shortest distance between the outer edges of each light emitting part is 28 mm or less, and more preferably 22 mm or less. . When the distance between the first light emitting unit and the second light emitting unit is 28 mm or less, the light emitted from each of the first light emitting unit and the second light emitting unit can be sufficiently mixed. In addition, the beam angle of each LED element of the first light emitting unit and the second light emitting unit is preferably 140 ° or less, and more preferably 120 ° or less. Good brightness can be obtained when the beam angle of the LED element (a value that is twice the angle between the luminosity direction half the maximum luminous intensity of the light emitted from the LED element and the optical axis) is 140 ° or less. .
FIG. 20 is a plan view schematically showing a light emitting device according to Embodiment 7 of the present invention.
The light emitting device according to the present embodiment has the same configuration as the light emitting device according to Embodiment 2 as a basic configuration. The difference from the second embodiment is that the phosphor-containing translucent resin of the first light emitting unit 1 covers a part of the resin dam 40 arranged around the light emitting unit.
In the manufacturing process of the light emitting device according to the seventh embodiment, after the resin dam 40 is formed, the first light emitting unit 1 is formed inside the resin dam 40 and is surrounded by the resin dam 40 and the first light emitting unit 1. A phosphor-containing translucent resin that constitutes the second light-emitting portion 2 is injected into the formed region. For example, in a situation where it is desirable that the width of the first light-emitting portion 1 is narrow in order to emit a low color temperature, the first light-emitting portion must be formed like drawing a resin layer. For this reason, the cutting of the resin becomes worse at the longitudinal end portion 14 of the first light emitting unit 1, and the longitudinal end portion 14 has a bulge as shown in FIG.
When the first light emitting unit 1 is formed inside the resin dam 40, if the longitudinal end 14 of the first light emitting unit 1 is positioned inside the portion surrounded by the resin dam 40, When the second light emitting unit 2 is injected, the second light emitting unit 2 surrounds the longitudinal end portion 14 of the first light emitting unit. Then, the light emitted from the first light emitting unit 1 and the light emitted from the second light emitting unit 2 cannot be sufficiently mixed, and the color temperature of the light emitted from the entire light emitting device is set to a desired color temperature. I can't.
On the other hand, as shown in FIG. 20, when the longitudinal end portion 14 of the first light emitting unit 1 is formed so as to cover a part of the resin dam 40, the second light emitting unit 2 is injected later. In this case, the longitudinal end portion 14 of the first light emitting unit 1 is not surrounded by the second light emitting unit 2. According to this, the light emitted from the first light emitting unit 1 and the light emitted from the second light emitting unit 2 can be sufficiently mixed, and the color temperature of the light emitted from the entire light emitting device is set to a desired color temperature. can do.
The position of the longitudinal end 14 of the first light emitting unit 1 is preferably outside the center of the width of the resin dam 40. According to this, the boundary line between the first light emitting unit 1 and the second light emitting unit 2 can be in contact with the resin dam while maintaining a substantially straight line. For this reason, it can prevent reliably that the 2nd light emission part 2 surrounds the longitudinal direction edge part 14 of the 1st light emission part 1. FIG.
The longitudinal end portion 14 of the first light emitting unit 1 is preferably formed on the resin dam 40. Accordingly, it is possible to prevent the first light emitting unit 1 from covering part or all of the resistance value monitoring land 22 or the resistor 80. When the first light emitting unit 1 covers the resistance value monitor land 22, the resistance value cannot be measured. In addition, when the first light emitting unit 1 covers a part of the resistor 80, the resistor 80 is notched by laser trimming and cannot be adjusted to have a desired resistance value.
The height of the first light emitting unit 1 is preferably higher than the height of the second light emitting unit 2. According to this, when the second light emitting unit 2 is injected after the resin dam 40 and the first light emitting unit 1 are formed, the second light emitting unit 2 rides on the first light emitting unit 1. Can be prevented. Thereby, mixing with the fluorescent substance contained in the 1st light emission part 1 and the fluorescent substance contained in the 2nd light emission part 2 can be prevented and reduced.
In Embodiment 7, two first light emitting units 1 and three second light emitting units are formed, but the number of first light emitting units 1 and second light emitting units 2 is limited to these. It is not carried out, but can be made into one or more places, respectively.
FIG. 21 is a plan perspective view of a light-emitting device according to Embodiment 8 of the present invention.
The light emitting device according to the present embodiment has the same configuration as the light emitting device according to Embodiment 4 as a basic configuration. The difference from the fourth embodiment is that two first light emitting portions and one second light emitting portion are formed, and that two wiring patterns 351 and 355 are connected to the resistor 380. The two wiring patterns 353 and 356 are connected to the resistor 381. The wiring pattern 351 and the wiring pattern 355 connected to the resistor 380 have different resistance values because the connection positions with the resistor 380 are different. Further, the wiring pattern 353 and the wiring pattern 356 connected to the resistor 381 are also different in resistance value because the connection position with the resistor 381 is different.
In FIG. 21, the wires that electrically connect the LED elements 330 of the first light emitting unit 301 are connected to the wiring pattern 351 and the wiring pattern 354, and the LED elements 330 of the second light emitting unit are electrically connected to each other. The wire to be connected is connected to the wiring pattern 350 and the wiring pattern 354, but the wire can be connected to any of the wiring patterns 350, 351, 353, 354, 355, and 356.
In light emitting devices using LED elements, chromaticity varies among the light emitting devices due to variations in forward voltage (VF) values of individual LED elements. For this reason, in order to obtain a certain chromaticity, it is necessary to change the mixing ratio of the phosphor and the translucent resin contained in the light emitting part according to the VF value of the LED element, and the management of the mixing condition is color. The degree management becomes complicated. On the other hand, the chromaticity of the light emitting device also changes depending on the resistance value of the wiring pattern to which the LED element is connected. Therefore, by selecting the resistance value of the wiring pattern to be connected according to the VF value of the LED element, it is possible to reduce the influence of the variation in the VF value on the chromaticity of the light emitting device. That is, the light-emitting device according to the present embodiment can be obtained by selecting a wiring pattern having an optimum resistance value for the connection destination of the LED element while maintaining the mixing ratio of the phosphor and the translucent resin. Can be obtained. Therefore, the light emitting device according to this embodiment can suppress variation in chromaticity between the light emitting devices.
FIG. 22 is a plan view schematically showing a light emitting device according to Embodiment 9 of the present invention.
The light emitting device according to the present embodiment has the same configuration as the light emitting device according to Embodiment 1 as a basic configuration. The difference from Embodiment 1 is that the first light emitting unit 1 is arranged at two locations, the second light emitting unit 2 is arranged at three locations, and the third light emitting unit is arranged at two locations, and the wiring patterns are k1, k2, That is, three resistors k3 are arranged, a resistor 80A is connected to the wiring pattern k1, a resistor 80B is connected to the wiring pattern k3, and a total of two resistors are arranged.
Since the light-emitting device according to Embodiment 9 has three types of light-emitting portions and three types of wiring patterns, there are two inflection points. If the number of inflection points is two, the amount of change in color temperature can be divided and the amount of change can be reduced. Thereby, the smooth color temperature adjustment of the light emitting device is possible. Note that FIG. 22 shows a case where there are three types of light emitting units and wiring patterns, but the types of light emitting units and wiring patterns are not limited to three types, and may be four or more types.
The light emitting device according to the tenth embodiment has the same configuration as the light emitting device according to the first embodiment as a basic configuration. The difference from the first embodiment is that a variable resistor is used as the resistor. When a variable resistor is used, the resistance value can be changed even after the light emitting device is assembled, so that the input current to the light emitting device can be controlled. Therefore, variation in color temperature between light emitting devices can be controlled. Furthermore, the user can adjust the color temperature. The type of the variable resistor is not particularly limited. For example, a volume type variable resistor shown in FIG. 23 can be used.
The light emitting device according to the eleventh embodiment has the same configuration as the light emitting device according to the first embodiment as a basic configuration. The difference from the first embodiment is that a thermistor is used as a resistor.
The thermistor is a temperature sensitive resistor whose resistance value changes according to the temperature change of the surrounding environment. There are two types of thermistors: PTC type (PTC: Positive Temperature Coefficient) whose resistance increases logarithmically when a certain temperature (Curie point) is exceeded, and NTC type (NTC type) whose resistance decreases logarithmically from low temperature to high temperature : Negative Temperature Coefficient). When the input current to the light emitting device is changed, the amount of heat generated by the light emitting unit changes, and the substrate temperature also changes. Therefore, when a thermistor is used as the resistance, the resistance value of the thermistor changes when the ambient current around the thermistor is changed by changing the input current. Thereby, the color temperature of the light emitted by the entire light emitting device can be controlled by changing the input current. Note that the NTC type uses a NTC type in this embodiment because the resistance value changes gradually with respect to temperature.
The light emitting device 6 according to one embodiment of the present invention shown in FIGS. 1 and 2 connects an anode electrode land 21, a cathode electrode land 20, and the anode electrode land 21 and the cathode electrode land 20. The first wiring k1 and the second wiring k2 are provided. The electric resistance of the first wiring k1 is larger than the electric resistance of the second wiring k2. Color of light emitted by the entire light emitting unit 12 including the first light emitting unit 1 electrically connected to the first wiring k1 and the second light emitting unit 2 electrically connected to the second wiring k2. The temperature is adjustable. The light emitting device of this embodiment can adjust the color temperature by supplying power from a single power source.
In the light emitting device 6, it is preferable that the first light emitting unit 1 and the second light emitting unit 2 each include an LED element 30, a translucent resin, and at least two kinds of phosphors. Since the light-emitting device of this embodiment uses an LED element as a light source, it has a long lifetime and can suppress heat generation during lighting. Furthermore, since the light emitting part includes at least two kinds of phosphors, the color temperature of light emitted from the light emitting part can be adjusted by adjusting the kind and blending amount of the phosphors. Moreover, the phosphor contained in the light emitting part can efficiently absorb the light emitted from the LED element, and the light emission efficiency can be improved.
In the light emitting device 6, the first wiring k <b> 1 preferably includes a resistor 80. According to the light emitting device of this embodiment, the color temperature of the light emitted from the light emitting unit 12 can be adjusted by adjusting the resistance value of the first wiring.
The light emitting device 6 is arranged so that the first light emitting unit 1 and the second light emitting unit 2 can mix the light emitted from the first light emitting unit and the second light emitting unit, respectively. Is preferred. According to the light emitting device of the present embodiment, the light emitted from the first light emitting unit 1 and the second light emitting unit 2 is uniformly mixed, and light having a more uniform color temperature can be emitted.
In the light emitting device 6, it is preferable that the content rate of the phosphor contained in the first light emitting unit 1 is different from the content rate of the phosphor contained in the second light emitting unit 2. According to the light emitting device of the present embodiment, the color temperature of the light emitted from the first light emitting unit 1 and the color temperature of the light emitted from the second light emitting unit 2 can be set to different color temperatures.
The light emitting device 600 includes a plurality of the first light emitting units 601 and the second light emitting units 602, and the plurality of first light emitting units 601 are connected in series on the first wiring k1, The plurality of second light emitting units 602 are connected in series on the second wiring k2, and each of the plurality of first light emitting units and the plurality of second light emitting units includes an LED element 630 and a light transmitting property. It is preferable to contain a resin and at least two kinds of phosphors. According to the light-emitting device of this embodiment, the color temperature can be adjusted by supplying power from a single power source.
In the light emitting device 6, the resistor 80 preferably includes a chip resistor or a printed resistor. According to the light emitting device of the present embodiment, the resistance value can be easily adjusted.
In the light emitting device 6, the resistor 80 is preferably covered with a phosphor-containing resin or a colored resin. According to the light emitting device 6 of the present embodiment, light absorption by the resistor 80 can be reduced.
In the light emitting device 6, the first wiring k1 preferably includes a resistance value monitor. According to the light emitting device of the present embodiment, the resistance value can be accurately measured, and the color temperature of the light emitted from the light emitting unit 12 can be easily adjusted.
In the light emitting device 6, it is preferable that a protection element is connected in parallel to at least one of the first wiring k1 and the second wiring k2. According to the light emitting device of the present embodiment, it is possible to prevent damage to the wiring circuit during overcurrent energization.
In the light emitting device 6, a resin dam is preferably formed around the first light emitting unit 1 and the second light emitting unit 2. According to the light emitting device of the present embodiment, the first light emitting unit 1 and the second light emitting unit 2 including a translucent resin can be held inside the resin dam.
In the light emitting device 6, the resistor 80 is preferably disposed outside the resin dam. According to the light emitting device of the present embodiment, light absorption by the resistor 80 can be reduced.
In the light emitting device 6, the resistor 80 is preferably covered with a resin dam. According to the light emitting device 6 of the present embodiment, light absorption by the resistor 80 can be reduced.
In the light emitting device 6, it is preferable that at least a part of the first wiring k1 and at least a part of the second wiring k2 are covered with a resin dam. According to the light emitting device of the present embodiment, light absorption by each wiring can be reduced. Furthermore, the wiring can be protected from external stress.
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.
In Example 1, a test was performed using a light-emitting device having a structure similar to that in Embodiment 2.
A ceramic substrate was used as the substrate. The resistor 80 is a chip resistor having a resistance value of 60Ω.
In the first light emitting unit 1 and the second light emitting unit 2, the first red phosphor 60 (CaAlSiN 3 : Eu), the second red phosphor 61 ((Sr, Ca) AlSiN 3 : Eu), and the green phosphor 70. (Lu 3 Al 5 O 12 : Ce) and the blue light emitting LED element 30 (light emission wavelength 450 nm) are sealed with a silicone resin. The blue light emitting LED element 30 and the wiring pattern are electrically connected by a wire, and the wiring pattern is electrically connected to the electrode land.
The color temperature of the light emitted from the first light emitting unit 1 of the light emitting device of Example 1 is 5000K, and the color temperature of the light emitted from the second light emitting unit 2 is 2700K. Next, the relationship between the total amount of forward currents flowing through the first wiring and the second wiring (hereinafter also referred to as total forward current) and the color temperature of light emitted from the light-emitting device was examined.
The color temperature of the light emitted from the entire light emitting device when the total forward current 350 mA flows was 4000K, and the color temperature of the light emitted from the entire light emitting device when the total forward current 50 mA flowed was 2700K.
FIG. 6A shows the relationship between the relative luminous flux (%) of light and the color temperature when the total forward current is changed, assuming that the luminous flux of the light emitted from the entire light emitting device when the total forward current is 350 mA is 100%. It is a graph which shows a relationship. FIG. 6A shows that the color temperature decreases as the relative luminous flux decreases.
FIG. 6B is a diagram illustrating light spectra when the color temperature of light emitted from the entire light emitting device is 4000K (forward current 350 mA) and 2700 K (forward current 50 mA). FIG. 6B shows that the color temperature of the light emitting device of Example 1 can be changed by supplying power from a single power source.
In Example 2, a test was performed using a light-emitting device having a structure similar to that of Embodiment 3.
A ceramic substrate was used as the substrate. The resistors 280 and 281 are chip resistors having a resistance value of 125Ω.
In the first light emitting portion 201 and the second light emitting portion 202, a first red phosphor 260 (CaAlSiN 3: Eu), a green phosphor 270 (Lu 3 Al 5 O 12 : Ce) and the blue light emitting LED element 230 (light emitting Wavelength 450 nm) is sealed with silicone resin. The blue light emitting LED element and the wiring pattern are electrically connected by a wire, and the wiring pattern is electrically connected to the electrode land.
The light emitting device of Example 2 is formed so that the color temperature of the light emitted from the first light emitting unit 201 is 4000K and the color temperature of the light emitted from the second light emitting unit 202 is 2000K. Next, the relationship between the total amount of forward currents flowing through the first wiring and the second wiring (hereinafter also referred to as total forward current) and the color temperature of light emitted from the light-emitting device was examined.
The color temperature of light emitted from the entire light emitting device when the total forward current of 350 mA flows was 3000K, and the color temperature of light emitted from the entire light emitting device when the total forward current of 50 mA flowed was 2000K.
In Example 3, a test was performed using a light-emitting device having a structure similar to that of Embodiment 4.
A ceramic substrate was used as the substrate. The resistors 380 and 381 are printing resistors having a resistance value of 30Ω.
In the first light emitting unit 301 and the second light emitting unit 302, the second red phosphor 361 ((Sr, Ca) AlSiN 3 : Eu), the green phosphor 370 (Lu 3 Al 5 O 12 : Ce) and the blue light emission. The LED element 330 (light emission wavelength 450 nm) is sealed with a silicone resin. The blue light emitting LED element and the wiring pattern are electrically connected with a wire, and the wiring pattern is electrically connected to the electrode land through a resistor.
The light emitting device of Example 3 is formed so that the color temperature of light emitted from the first light emitting unit 301 is 3000K and the color temperature of light emitted from the second light emitting unit 302 is 2000K. Next, the relationship between the total amount of forward currents flowing through the first wiring and the second wiring (hereinafter also referred to as total forward current) and the color temperature of light emitted from the light-emitting device was examined.
When the total forward current 350 mA flows, the color temperature of the light emitted from the entire light emitting device is 2700K, and when the total forward current 50 mA flows, the color temperature of the light emitted from the entire light emitting device is 2000K.
In Example 4, a test was performed using a light-emitting device having a structure similar to that of Embodiment 5.
A ceramic substrate was used as the substrate. The resistor 580 is a printing resistor having a resistance value of 60Ω.
In the first light emitting unit 501 and the second light emitting unit 502, the first red phosphor 560 (CaAlSiN 3 : Eu), the second red phosphor 561 ((Sr, Ca) AlSiN 3 : Eu), and the green phosphor 570. (Lu 3 Al 5 O 12 : Ce) and the blue light emitting LED element 530 (emission wavelength: 450 nm) are sealed with a silicone resin. The blue light emitting LED element and the wiring pattern are electrically connected by a wire, and the wiring pattern is electrically connected to the electrode land.
The light emitting device of Example 4 is formed so that the color temperature of light emitted from the first light emitting unit 501 is 3000K, and the color temperature of light emitted from the second light emitting unit 502 is 2200K. Next, the relationship between the total amount of forward currents flowing through the first wiring and the second wiring (hereinafter also referred to as total forward current) and the color temperature of light emitted from the light-emitting device was examined.
The color temperature of the light emitted from the entire light emitting device when the total forward current 350 mA flows was 2700K, and the color temperature of the light emitted from the entire light emitting device when the total forward current 50 mA flowed was 2200K.
In Example 5, a test was performed using a light-emitting device having a structure similar to that of Embodiment 8. Hereinafter, the light emitting device will be described with reference to FIG.
A ceramic substrate was used as the substrate 310. Resistors 380 and 381 are printing resistors. The resistance value of the wiring pattern 355 is 30Ω, the resistance value of the wiring pattern 351 is 31Ω, the resistance value of the wiring pattern 353 is 27.5Ω, and the resistance value of the wiring pattern 356 is 25Ω.
In the first light emitting unit 301 and the second light emitting unit 302, the second red phosphor 361 ((Sr, Ca) AlSiN 3 : Eu), the green phosphor 370 (Lu 3 Al 5 O 12 : Ce) and the blue light emission. The LED element 330 (light emission wavelength 450 nm) is sealed with a silicone resin. The blue light emitting LED element and the wiring pattern are electrically connected by a wire.
<When the resistance value of the wiring pattern is the same (30Ω)>
Four types of light emitting devices were fabricated using four types of LED elements having different VF values (VF values: 3.04V, 3.08V, 3.17V, 3.27V) as blue light emitting LED elements. In all the light emitting devices, the wire of the first light emitting unit is connected to the wiring pattern 355 (resistance value 30Ω).
A forward current of 100 mA to 700 mA was passed through the four types of light emitting devices. FIG. 24 shows a chromaticity distribution of light emitted by each light emitting device in a low current region (100 mA) or a high current region (700 mA).
<When wiring pattern resistance values are different (30Ω, 31Ω, 27.5Ω, 25Ω)>
Next, four types of light emitting devices were manufactured using the above four types of LED elements. In each light emitting device, the VF value of the LED element and the wiring pattern to which the wire of the first light emitting unit is connected were combined as follows.
<LED element VF value><Wiring pattern (resistance value)>
3.04V wiring pattern 351 (31Ω)
3.08V wiring pattern 355 (30Ω)
3.17V wiring pattern 353 (27.5Ω)
3.27V wiring pattern 356 (25Ω)
A forward current of 100 mA to 700 mA was passed through the four types of light emitting devices. FIG. 25 shows the chromaticity distribution of light emitted by each light emitting device in the low current region (100 mA) or the high current region (700 mA).
1, 201, 301, 401, 501, 601, 701 First light emitting part 2,202,302,402,502,602,702 Second light emitting part 12,612,712 Light emitting part 14 Longitudinal end 6, 100, 200, 300, 400, 500, 600, 700, 800 Light emitting device 10, 210, 310, 510, 610, 710 Substrate 20, 220, 320, 520, 620, 720 Cathode electrode land 21, 221, 321, 521, 621, 721 Anode electrode land 22 Resistance value monitoring land 30, 230, 330, 530, 630, 730 LED element 40, 240, 340, 440, 540 Resin dam 50, 51, 52, 251, 252, 350 , 351, 353, 354, 450, 451, 453, 454, 550, 551 , 552 Wiring pattern 60, 260, 560, 660, 760 First red phosphor 61, 361, 461, 561, 661, 761 Second red phosphor 70, 270, 370, 470, 570, 670, 770 Green phosphor 80, 280, 281, 380, 381, 580, 680, 780, 80A, 80B Resistor 90, 590 Wire 703 Reflector k1 First wiring k2 Second wiring k3 Third wiring
An anode electrode lands disposed on the one substrate, and the cathode electrode lands, and the first wiring and the second wiring for connecting the cathode electrode lands and the anode electrode lands, the first A first light emitting unit electrically connected to the wiring and a second light emitting unit electrically connected to the second wiring,
The first wiring and the second wiring are connected in parallel;
A fixed resistor is connected in series to one of the first wiring and the second wiring,
As the fixed resistor, only a printing resistor or a chip resistor is provided,
The magnitude of the current flowing through the first wiring and the second wiring can be adjusted by supplying power from a single power source ,
Before SL is a first light emitting unit and the color temperature of the second light emitted from the light emitting portion is constant, the color temperature of the first light emitted from the light emitting portion, the color of light emitted from the second light emitting portion Higher than temperature,
By supplying power from the single power source, a resistance value of the printing resistor or chip resistor is constant, a ratio of current flowing through the first wiring and the second wiring is changed, and the first light emitting unit and the first light emitting unit The luminous flux ratio of the second light emitting unit changes,
By mixing the light emitted from the first light emitting unit and the second light emitting unit, the color temperature of the light emitted from the entire light emitting unit including the first light emitting unit and the second light emitting unit can be adjusted. Yes,
Each of the first light emitting unit and the second light emitting unit includes a plurality of LED elements each having a peak emission wavelength within a wavelength range of 430 nm or more and 480 nm or less, connected in series, a translucent resin and at least two kinds of phosphors Including
Wherein at least two types of phosphors, viewed contains a green phosphor and a red phosphor,
The plurality of LED elements are sealed with a translucent resin containing the at least two kinds of phosphors,
The first light emitting unit and the second light emitting unit are arranged in contact with each other so that the light emitted from each of the first light emitting unit and the second light emitting unit can be mixed,
The one substrate includes an annular resin dam that surrounds the entire light emitting unit including the first light emitting unit and the second light emitting unit, and the fixed resistance of the light emitting unit surrounded by the resin dam. A light emitting device disposed outside .
Wherein at least two types of phosphor content of included in the first light emitting portion, wherein the at least two are included in the second light emitting portion phosphor and content different, according to claim 1 Light emitting device.
Each having a plurality of the first light emitting units and the second light emitting units;
The plurality of first light emitting units are connected in series on the first wiring, and the plurality of second light emitting units are connected in series on the second wiring,
Wherein each of the first light emitting unit and the plurality of second light emitting unit, LED element, comprising a translucent resin and at least 2 kinds of phosphors, the light emitting device according to claim 1 or 2.
An anode electrode lands disposed on said substrate, a cathode electrode lands, and the first wiring and the second wiring for connecting the cathode electrode lands and the anode electrode land, the first wiring A first light emitting unit electrically connected to the second light emitting unit and a second light emitting unit electrically connected to the second wiring ,
The at least two kinds of phosphors include a green phosphor and a red phosphor,
The first light emitting unit and the second light emitting unit are disposed in contact with each other so that light emitted from the first light emitting unit and the second light emitting unit can be mixed together. The apparatus further includes an annular resin dam surrounding the entire light emitting unit including the first light emitting unit and the second light emitting unit on the substrate, and the fixed resistor is surrounded by the resin dam. Placed outside the light emitting part,
Either the first light emitting unit or the second light emitting unit covers at least a part of the resin dam.
The light emitting device according to claim 4 , wherein a height of a light emitting unit covering at least a part of the resin dam is higher than a height of the other light emitting unit.
The light emitted from the entire light emitting unit including the first light emitting unit and the second light emitting unit has a first peak emission wavelength in a wavelength range of 430 nm to 480 nm and has a first peak emission wavelength in a wavelength range of 580 nm to 680 nm. The light-emitting device according to claim 1, which has a peak emission wavelength of 2.
JP2014162407A 2014-01-29 2014-08-08 Light emitting device Active JP6203147B2 (en)
JP2014014234 2014-01-29
JP2014072338 2014-03-31
JP2014162407A JP6203147B2 (en) 2014-01-29 2014-08-08 Light emitting device
EP15743871.4A EP3101700A4 (en) 2014-01-29 2015-01-07 Light-emitting device
CN201580002625.4A CN105723531B (en) 2014-01-29 2015-01-07 Light emitting device
PCT/JP2015/050218 WO2015115134A1 (en) 2014-01-29 2015-01-07 Light-emitting device
US15/114,816 US20160353544A1 (en) 2014-01-29 2015-01-07 Light-emitting device
JP2015201614A JP2015201614A (en) 2015-11-12
JP6203147B2 true JP6203147B2 (en) 2017-09-27
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JP2014162407A Active JP6203147B2 (en) 2014-01-29 2014-08-08 Light emitting device
US (1) US20160353544A1 (en)
EP (1) EP3101700A4 (en)
JP (1) JP6203147B2 (en)
CN (1) CN105723531B (en)
WO (1) WO2015115134A1 (en)
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US20120031304A1 (en) * 2010-08-04 2012-02-09 Fernandes Fernando Cesar Lipid-coated metallic sulfates compositions for reducing cations in cement based compositions, and related methods
JP2013098458A (en) * 2011-11-04 2013-05-20 Mitsubishi Chemicals Corp Semiconductor light-emitting device and illumination instrument employing the same
2014-08-08 JP JP2014162407A patent/JP6203147B2/en active Active
2015-01-07 WO PCT/JP2015/050218 patent/WO2015115134A1/en active Application Filing
2015-01-07 EP EP15743871.4A patent/EP3101700A4/en active Pending
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