JP7416791B2 - Illumination light sources and vehicle lights - Google Patents

Description

FIELD OF THE INVENTION The present invention relates to lighting technology, and in particular to lighting sources.

As a new semiconductor lighting source, LED light sources have advantages such as all-solid-state operation, high electrical-optical conversion efficiency, and high luminous efficiency, and are widely used in various lighting environments. In the automotive lighting field, LED light sources are occupying an increasingly large share, and vehicle headlight manufacturers and LED manufacturers are beginning to pay attention to the application of LED light sources to the automotive lighting field. However, the light emitting characteristics of LED light sources are clearly distinguished from those of conventional light sources (halogen filament and xenon filament), so conventional LED light sources can be used directly in vehicle headlights instead of halogen filaments or xenon filaments. cannot be applied to

In the vehicle headlight retrofit market, vehicle headlight manufacturers or LED manufacturers have submitted many solutions. Figure 1 is a drawing of an embodiment of Osram's Chinese patent application CN107013863A, A lamp is disclosed and an alternative lamp is provided, which comprises a plurality of LED light sources 2, an adapter 5 for guiding light, a light collector 9, and a light output body 13. The lights emitted from the plurality of LED light sources 2 are combined, guided to the adapter 5, guided to the light output body 13 via the condenser 9, and emitted to the outside. The light emission characteristics of this alternative lamp are similar to those of conventional lamps, and it can directly replace the halogen incandescent lamp in vehicles, but multiple LED light sources can be used with the same heat radiation to increase the brightness of the lamp. Since the LED light source is densely arranged on the substrate, it is difficult to solve the problem of heat dissipation of the LED light source, which limits the improvement of the brightness of the vehicle illumination light.

FIG. 2 represents a drawing of an embodiment of patent CN205351102U, in which a lighting device and a vehicle light are disclosed, which remotely excite a fluorescent bar using a fiber-optic coupled excitation light source and Since the luminescent properties of fluorescent sticks are similar to those of filaments, they can replace conventional halogen filaments and xenon filaments. With this technique, the efficiency with which the excitation light source is coupled into the optical fiber is low, and the brightness of the illumination device cannot be increased.

The present invention provides an illumination light source that has high luminous flux and good heat dissipation performance, in order to solve the problems of reduced optical coupling efficiency and difficulty in heat dissipation that exist in the light sources in the prior art.

The illumination light source comprises a light source, a first phosphor layer, and a light guiding element, the light source comprising one first light source, at least one second light source and at least one third light source, the first light source and the second light source emits excitation light, the third light source emits auxiliary light, and the first phosphor layer includes a fluorescent substance and absorbs the excitation light and emits first fluorescence. , the excitation light emitted by the first light source and the excitation light emitted by the second light source enter the first phosphor layer from the back surface and the front surface of the first phosphor layer, respectively, and the light guiding element includes: a light output side that reflects the excitation light and the auxiliary light and transmits the first fluorescence, or transmits the excitation light and the auxiliary light and reflects the first fluorescence, and the first light source; , the second light source and the third light source are respectively located on different sides of the light guide element, and the first fluorescence and the auxiliary light are both emitted from the light output side of the light guide element. Characteristic lighting source.

In this technology, each of the first light source and the second light source excites the first phosphor layer from the back side and the front side, so that the intensity of the excitation light that excites the first phosphor layer increases, and the first phosphor layer is excited. The intensity of the first fluorescence emitted by the body layer is high. In addition, the first fluorescence emitted by the first phosphor layer and the auxiliary light emitted by the third light source are guided through the light guide element, and then both are emitted from the light output side of the light guide element to provide illumination light. The brightness of the illumination light increases. Moreover, the first light source, the second light source, and the third light source are respectively provided on different sides of the light guiding element, which is advantageous for heat dissipation of each light source, and the light emission efficiency of the light source is high.

In one embodiment of the present invention, the illumination light source further includes a light guide, and the light guide is provided on the light output side and includes a light output section, and the light guide is configured to combine the auxiliary light emitted by the light guide element with the light output part. One fluorescent light enters the light guide and exits from the light output section.

In one embodiment of the present invention, the first phosphor layer is provided in an optical path between the first light source and the light guiding element, and the back surface of the first phosphor layer is configured to transmit blue light. A film layer that reflects yellow light is provided.

In one embodiment of the present invention, the light guide element is a cube formed by bonding two triangular prisms, a spectroscopic film is provided at the bonded location, and the light sources include one first light source and one triangular prism. It includes a second light source and one third light source, the light sources are respectively provided on three sides of the light guide element, and the light emitted by the light source is incident on the spectroscopic membrane at 45 degrees.

In one embodiment of the present invention, the light guide element is a cube formed by bonding two triangular pyramids and two square pyramids, a spectroscopic film is provided at the bonded location, and the light source is a cube formed by bonding two triangular pyramids and two quadrangular pyramids. The light source includes one light source, two second light sources, and two third light sources, the light sources are respectively provided on five sides of the light guiding element, and the light emitted by the light source hits the spectroscopic membrane at 45 degrees. incident.

In one embodiment of the invention, the light output part of the light guide further includes a scattering structure, and the light guide further includes a reflective layer, and the reflective layer is provided on a terminal surface of the light guide.

In one embodiment of the invention, the illumination light source further comprises an optical element, the optical element being provided in an optical path between the light source or the first phosphor layer and the light guiding element, and the optical element is provided in an optical path between the light source or the first phosphor layer and the light guiding element, and the optical element is provided in an optical path between the light source or the first phosphor layer and the light guiding element. , a reflective cup or a tapered light guide. In this technical scheme, the Lambertian light emitted by the light source or the first phosphor layer is collimated and the near-parallel light enters the spectroscopic membrane again, so that all the light rays enter the spectroscopic membrane at an angle of 45 degrees. However, the light efficiency is relatively high.

In one embodiment of the present invention, the illumination light source further includes a second phosphor layer, the second phosphor layer is provided at a light output portion of the light guide, and the second phosphor layer It is excited by the excitation light and emits second fluorescence.

In view of the above problems, the present invention provides a vehicle light as another technical solution. The vehicle light includes the above-mentioned illumination light source and a reflecting bowl.

Unlike the prior art, in the embodiment of the present invention, each of the first light source and the second light source generates excitation light that excites the first phosphor layer by exciting the first phosphor layer from the back side and the front side. The intensity is increased, and the intensity of the first fluorescence emitted from the first phosphor layer is high. In addition, the first fluorescence emitted by the first phosphor layer and the auxiliary light emitted by the third light source guide light through the light guide element, and then both are emitted from the light output side of the light guide element to provide illumination light. The brightness of the illumination light increases. Moreover, the first light source, the second light source, and the third light source are respectively provided on different sides of the light guide element, which is advantageous for heat dissipation of each light source, and the light emission efficiency of the light source is high.

FIG. 1 is a schematic configuration diagram of a conventional illumination light source. FIG. 1 is a schematic configuration diagram of a conventional illumination light source. 1 is a schematic configuration diagram of an embodiment of an illumination light source in the present invention. FIG. 1 is a schematic configuration diagram of a light guiding element according to an embodiment. FIG. 3 is a transmittance curve diagram of a spectroscopic film in an embodiment. It is a figure which shows the other structure of one Embodiment of the illumination light source in this invention. It is a figure which shows the other structure of one Embodiment of the illumination light source in this invention. It is a schematic block diagram of other embodiments of the illumination light source in this invention. FIG. 3 is a schematic configuration diagram of another light guiding element in the embodiment. It is a schematic block diagram of other embodiments of the illumination light source in this invention. It is a schematic block diagram of other embodiments of the illumination light source in this invention. It is a schematic block diagram of another example of the vehicle light in this invention.

The supplementary light in the present invention refers to supplementing the fluorescence, complementing the emission spectrum, or improving the luminosity. The supplementary illumination light can meet various application scenarios, such as when the fluorescence spectrum is yellow fluorescent. In this case, the auxiliary light is blue light, and the yellow light and blue light finally realize white light.

Further, the back surface of the first phosphor layer in the present invention is the surface close to the first light source, and the front surface is the opposite surface.

In order for those skilled in the art to better understand the technical means of the present invention, the technical means of the embodiments of the present invention will be clearly and comprehensively described below, together with the drawings of the embodiments of the present invention. Naturally, the described embodiments are some but not all embodiments of the present invention. It should be understood that those skilled in the art can derive other embodiments based on the embodiments of the present invention without any creative effort, and all of these fall within the protection scope of the present invention.

In addition, in the embodiments of the present invention, descriptions such as "first", "second", "third", etc. are used only for explanation, and do not indicate or imply their relative importance. It should not be understood as implicitly specifying the number of technical features presented. Accordingly, the features defined as "first," "second," and "third" may explicitly or implicitly include at least one of the features. Moreover, the technical solutions of each embodiment of the present invention can be combined with each other. However, the basis thereof is that it can be realized by a person skilled in the art. If the combination of technical solutions is inconsistent or cannot be realized, it should be understood that such a combination of technical solutions does not exist and is not within the protection scope claimed by the present invention.

The main reasons that limit the use of LEDs instead of filaments in the vehicle headlight retrofit market are as follows. First, when LEDs are used instead of lamps, the brightness of the emitted light of the LEDs does not meet the demand. Next, heat dissipation of the LED light source is difficult to solve. An object of the present invention is to solve the above problems.

Embodiments of the present invention will be described in detail below with reference to the drawings. Referring to FIG. 3, the present invention provides an illumination light source 100, which includes a first light source 111, a second light source 112, a third light source 113, a first phosphor layer 131, a light guiding element 140. and a light guide 150. Note that the excitation light emitted from the first light source 111 and the excitation light emitted from the second light source 112 enter the first phosphor layer 131 from the back surface and the front surface of the first phosphor layer 131, respectively. The phosphor layer 131 is excited to emit first fluorescence, and the first fluorescence and the auxiliary light emitted from the third light source 113 enter the light guide element from different sides of the light guide element 140, and the light guide element The light is emitted from the light emitting side of 140.

Note that the first light source 111, the second light source 112, and the third light source 113 are blue light LED light sources, and may be blue light laser light sources or other solid-state blue light sources, and the wavelength range 420 of the blue light they emit is ~460 nm, and the peak wavelength of the blue light emitted by each light source may be the same or different. The first phosphor layer 131 is a transmissive phosphor layer and includes a base and a luminescent center. The substrate may be transparent silica gel, glass or ceramic, and the luminescent center may include phosphors or quantum dots or other luminescent materials. Specifically, the luminescent center is a YAG phosphor, which absorbs blue light and emits yellow fluorescence. In a specific embodiment, a wavelength spectroscopic film is provided on the back surface of the first phosphor layer 131, specifically, a film layer that transmits blue light and reflects yellow light; A film layer that transmits blue light and reflects yellow light may be provided on the back surface of 131 by magnetron sputtering.

As shown in FIG. 4, the light guide element 140 is formed by bonding two prisms 141, and a spectroscopic film 142 is provided at the bonded location. Specifically, the light guide element 140 is It is formed by bonding a prismatic column ABDEFG and a prismatic column BCDEGH, and a spectroscopic film 142 is provided on the joint surface BDEG. The spectroscopic film 142 may reflect blue light and transmit yellow light, or may transmit blue light and reflect yellow light. As shown in Figure 5A, when the angle of the incident light is 45 degrees, the transmittance curved surface of the spectroscopic film has almost zero transmittance in the range of 400 to 480 nm, and the transmittance is higher than 97% in the range of 500 to 800 nm. Become. As shown in Figure 5B, when the incident light angle is 45 degrees, the transmittance curve of the spectroscopic film shows that the transmittance is higher than 97% in the range of 400 to 480 nm, and the transmittance is almost zero in the range of 500 to 800 nm. .

The light guide 150 may be a square rod, a conical rod, a round rod, a conical rod, etc., and the material of the light guide 150 is, for example, transparent organic glass (PMMA, polymethyl methacrylate), glass, quartz, sapphire. , YAG (yttrium aluminum garnet), or the like. The light guide 150 includes a light guiding part 153 and a light emitting part 151, and a scattering structure is provided on the outer surface of the light emitting part 151, and this scattering structure may be formed by directly roughening the outer surface of the light emitting part 151. , a fine structure may be provided on the outer surface of the light emitting portion, or a scattering layer may be coated on the outer surface of the light emitting portion. This scattering layer includes scattering particles and a carrier, the carrier has a refractive index greater than the refractive index of the light guide 150, and a scattering structure is formed so that light is emitted from the light output section 151. In other embodiments, scattering particles may be provided inside the light emitting portion 151, for example, pores may be provided, or particles having a different refractive index from that of the light guide 150 may be provided, such as alumina particles, barium sulfate particles, titanium oxide particles, or magnesium oxide particles. It may also be fine particles.

In another specific embodiment, as shown in FIG. 6, a second phosphor layer 132 including a substrate and a luminescent center is provided on the outer surface of the light output portion 151 of the light guide 150, and the substrate is made of transparent silica gel, It may be glass or ceramic, and the luminescent center may include phosphors or quantum dots. The second phosphor layer 132 absorbs blue light and emits second fluorescent light. In other embodiments, the second phosphor layer 132 may include a substrate and a red phosphor, and the red phosphor is excited to emit red light by blue light, increasing the proportion of red light in the emitted light. By increasing the color rendering index of the emitted light, the color rendering index of the emitted light is increased to meet the needs of the color rendering index. The second phosphor layer 132 may include a base and a yellow phosphor, and the yellow light is excited and emitted by the blue light, and by further improving the intensity of the yellow light in the emitted light, the blue light in the emitted light is By changing the occupation ratio of yellow light and yellow light, the color temperature of the output light can be changed to meet the needs of different color temperatures. In addition, in this embodiment, by providing the first phosphor layer 131 and the second phosphor layer 132 in the illumination light source at the same time, it is advantageous to keep them far apart and to disperse the heat source. avoid deterioration.

A reflective layer 152 is provided on the end surface of the light guide 150 to reflect the blue light or yellow light irradiated onto the reflective layer 152 and output the reflected light from the light output section 151 . This reflective layer may be a diffuse reflective layer or a Gaussian scattering reflective layer, and among these, diffuse reflection means that a light beam exhibits a Lambertian distribution after being reflected by the reflective layer, The intensity of the reflected light exhibits a cosine distribution. The diffusely reflecting material is a mixture of particles such as TiO ₂ , MgO, BaSO ₄ and adhesive and glass powder. Gaussian scattering reflection means that a beam exhibits a high Gaussian distribution after being reflected by a reflective layer, and the intensity of the reflected light exhibits a Gaussian distribution.

In a specific embodiment, the illumination light source 100 further includes optical elements 121, 122 and 123, each of which is a first phosphor layer 131, a second light source 112 or a third light source. 113 and the light guiding element 140, it collects and collimates the light emitted from the first phosphor layer 131, the second light source 112, and the third light source 113, and converts it into near-parallel light. Become. The optical element may be, for example, an optical lens, a reflective cup, or a tapered light guide. In this embodiment, the optical element is an optical lens, specifically a collimating lens (group), and the optical element is a collimating lens (group). One phosphor layer 131, second light source 112, and third light source 113 are arranged at the focal points of collimating lenses (groups) 121, 122, and 123. In another embodiment, as shown in FIG. Even though the light is homogenized, compared to optical lenses, tapered light guides have higher efficiency and a more compact configuration. In other embodiments, the optical element may be a TIR lens.

In this embodiment, the excitation light emitted from the first light source 111 excites the first phosphor layer 131 from the back surface, and the excitation light emitted from the second light source 112 excites the first phosphor layer 131 from the front surface. excite. Specifically, the excitation light emitted by the second light source 112 is guided through the spectroscopic film 142 of the light guide element 140 and then irradiated onto the first phosphor layer 131. After being excited by the excitation light emitted by the first light source 111 and the second light source 112, the first fluorescent light is emitted from the front. The first fluorescent light and the auxiliary light emitted by the third light source 113 enter the light guide element 140 from different sides of the light guide element 140, and both enter the spectroscopic film 142 at an angle of 45 degrees. When the spectroscopic film 142 reflects blue light and transmits yellow light, the blue light emitted by the third light source 113 is reflected by the spectroscopic film 142, and the first fluorescence emitted by the first phosphor layer 131 is transmitted to the spectroscopic film 142. By transmitting the first fluorescent light and the auxiliary light, both the first fluorescent light and the auxiliary light are emitted from the light output side of the light guiding element 140. When the spectroscopic film 142 transmits blue light and reflects yellow light, the auxiliary light emitted by the third light source 113 passes through the spectroscopic film 142, and the yellow light emitted by the first phosphor layer 131 is reflected by the spectroscopic film 142. The first fluorescent light and the auxiliary light are both emitted from the light output side of the light guiding element 140 to form illumination light.

The illumination light emitted from the light emitting side of the light guide element 142 further enters the light guide 150, is transmitted through the light guide 150, and is emitted from the light emitting part 152 to the outside, forming 360 degree light emission.

The illumination light source 100 provided in the embodiments described above has the following advantages.

First, both the first light source 111 and the second light source 112 excite the first phosphor layer 121, so that the intensity of the first fluorescence emitted by the first phosphor layer 121 is high. Second, the first fluorescence emitted by the first phosphor layer 121 and the auxiliary light emitted by the third light source 113 are guided through the light guide element 140, and then both are guided from the light output side of the light guide element 140. The light is emitted to form illumination light, and the brightness of the illumination light is increased. Thirdly, the first light source 111, the second light source 112 and the third light source 113 are respectively provided on different sides of the light guide element 140, which is advantageous for heat dissipation of each light source and has high luminous efficiency of the light source.

As shown in FIG. 9, in another embodiment, the light guide element 240 is made by bonding two triangular pyramids 241 and two square pyramids 242, and a spectroscopic film 243, 244 are provided. Specifically, this light guide element 240 is formed by bonding two quadrangular pyramids BCDEH and EABGF and two triangular pyramids ABDE and BEGH, and spectroscopic films 244 and 243 are provided on the bonding surfaces ABEH and BDEG, respectively. ing. Here, the bonding surface ABEH consists of the bonding surfaces ABE and BEH, and the bonding surface BDEG consists of the bonding surfaces BDE and BEG. As shown in FIG. 8, this illumination light source 200 includes a first light source 211, two second light sources 212, 213, and two third light sources 214, 215. Here, the excitation light emitted from the first light source 211 excites the first phosphor layer 231 from the back surface, and the excitation light emitted from the two second light sources 212 and 213 excites the first phosphor layer 231 from the front surface. 231 is excited, and the first phosphor layer 231 emits the first fluorescence from the front after being excited. The first fluorescent light and the auxiliary light emitted from the third light sources 214 and 215 enter the light guiding element 240 from different sides of the light guiding element 240, respectively. Specifically, the use of one secondary light source and/or one tertiary light source may be reduced to achieve energy savings goals. As shown in FIG. 10, this is a case where one second light source decreases, and the illumination light source 200 includes four light sources, each of which is a first light source 211, a second light source 212, two third light sources 213, 214, which is a case where one third light source decreases as shown in FIG. 213, a third light source 214;

Referring again to FIG. 3, the illumination light source 100 of the present invention further includes a substrate 160 and a heatsink 170, the substrate 160 is a copper PCB board, the LED chip is integrated on the PCB board, and the heatsink 170 is provided on the side of the substrate far from the light source, and performs heat dissipation processing on the light source. In some cases, one light source may be placed directly on the heat sink 170 to dissipate heat. Note that the heat sink 170 may be integrally molded, may have a groove shape, or three individual heat sinks may be combined, and the substrate 160 and the heat sink 170 may be connected by welding or adhesive. You can. Each light source is spaced apart, and heat is radiated by a radiator, so that the heat radiating effect is high and the life of the light source is long.

Further, with reference to FIG. 12, the present invention provides a vehicle light 1000, which includes a first light source 1011, a second light source 1012, a third light source 1013, a first phosphor layer 1031, It includes a light guiding element 1040, a light guide 1050, and a reflecting bowl 1080, among which the light guide 1050 includes a light guide part 1053, a light output part 1052, and a reflective layer 1052 at the end, and the light output part 1052 includes a reflective layer 1052. It is provided at the focal point of the bowl 1080. Although the illumination light source of this embodiment is the illumination light source in any of the embodiments described above, the details will not be described again here. The light emitted by the light emitting part 1052 is reflected by the reflection bowl 1080 and emitted to the outside, thereby forming an ideal illumination light source pattern.

Different from the prior art, the illumination light source of the present invention comprises a light source, the light source comprising one first light source, at least one second light source, at least one third light source, said first light source, said The second light source and the third light source are respectively arranged on different sides of the light guiding element. In this technique, each of the first light source and the second light source excites the first phosphor layer from the back side and the front side, thereby increasing the intensity of the first fluorescence emitted from the first phosphor layer. In addition, the first fluorescence emitted by the first phosphor layer and the auxiliary light emitted by the third light source are guided through the light guide element and then emitted from the light output side of the light guide element to form illumination light. This increases the brightness of the illumination light.

The above descriptions are merely embodiments of the present invention, and do not limit the protection scope of the present invention. Any modification of the equivalent structure or equivalent process using the contents of the specification and accompanying drawings of the present invention, or any direct or indirect application to other related technical fields, shall fall within the protection scope of the present invention. It is included.

Claims (10)

An illumination light source comprising a light source, a first phosphor layer, and a light guiding element, the illumination light source comprising:
The light source includes one first light source, at least one second light source, and at least one third light source, wherein the first light source and the second light source emit excitation light, and the third light source emits excitation light. Emits light,
The first phosphor layer includes a fluorescent substance, absorbs excitation light and emits first fluorescence, and the excitation light emitted by the first light source and the excitation light emitted by the second light source are respectively entering the first phosphor layer from the back and front of one phosphor layer,
The light guide element includes a light output side and reflects the excitation light and the auxiliary light and transmits the first fluorescence, or transmits the excitation light and the auxiliary light and reflects the first fluorescence. death,
the first light source, the second light source and the third light source are respectively located on different sides of the light guiding element;
The first fluorescence and the auxiliary light are both emitted from the light output side of the light guide element,
The illumination light source further includes a light guide,
The light guide is provided on the light output side and includes a light guide part and a light output part,
The light emitting section emits illumination light from the side,
The auxiliary light and the first fluorescent light emitted by the light guide element enter the light guide and exit from the light output part,
The illumination light source further includes a second phosphor layer,
The second phosphor layer is provided on the outer surface of the light emitting part of the light guide, and the second phosphor layer is excited by the auxiliary light emitted from the third light source and emits second fluorescence. An illumination light source featuring: The first phosphor layer is provided in an optical path between the first light source and the light guiding element, and a wavelength spectroscopic film is provided on the back surface of the first phosphor layer. 1. The illumination light source according to 1. 2. The illumination light source according to claim 1, wherein the light guiding element is a cube formed by bonding two independent triangular prisms, and a spectroscopic film is provided at the bonded portion. The light source includes one first light source, one second light source, and one third light source, each of which is provided on three sides of the light guiding element, and the light emitted by the light source is 4. The illumination light source according to claim 3, wherein the illumination light source is incident on the spectroscopic film at an angle of 45 degrees. The illumination light source according to claim 1, wherein the light guide element is a cube formed by adhering two triangular pyramids and two quadrangular pyramids, and a spectroscopic film is provided at the adhered location. . The light source includes one first light source, two second light sources, and two third light sources, each of which is provided on five sides of the light guide element, and the light emitted by the light source is 6. The illumination light source according to claim 5, wherein the illumination light source is incident on the spectroscopic film at an angle of 45 degrees. Furthermore, it is equipped with an optical element,
The optical element is provided in an optical path between the light source or the first phosphor layer and the light guide element, and includes at least one of an optical lens, a reflective cup, and a tapered light guide. The illumination light source according to claim 1. The illumination light source according to claim 1, wherein the light emitting section includes a scattering structure. The illumination light source according to claim 1, wherein the light guide further includes a reflective layer, and the reflective layer is provided at a terminal end surface of the light guide. A vehicle light,
A vehicle light comprising the illumination light source according to claim 1 and a reflecting bowl.