Reflector and lighting device

Abstract

A reflector is applied to a lighting device. The reflecting plate comprises a reflecting layer and a homogenizing layer. The reflecting layer is used for reflecting the illuminating light beams entering the reflecting plate. The homogenizing layer is arranged on the reflecting layer. The homogenizing layer comprises a packaging substrate and a plurality of light homogenizing particles. The plurality of dodging particles are distributed in the packaging base material, and each dodging particle is made of at least one of a light-permeable material and a light-proof material, so that the dodging particles have a light beam homogenizing function. The homogenizing layer uses the light propagation direction changing function correspondingly provided by the plurality of light homogenizing particles to enlarge the illumination range of the illumination beam.

Description

Technical Field

[0001] The invention relates to a reflector and a lighting device, and in particular to a reflector and a lighting device capable of expanding the visible range of a solid-state light source to provide uniform lighting. Background Art

[0002] The traditional white light source system uses a laser light source module to provide a blue light beam, which is converted into a blue light beam and a yellow light beam through a light source diffusion module and a wavelength conversion module to mix to form a white light beam. However, due to the light type characteristics of the laser beam, the white light beam generated by the laser light source module using the light source diffusion module and the wavelength conversion module has only a small illumination range, and its application field is limited. Therefore, how to design a white light source system that can expand the visible range of solid-state light sources to provide uniform illumination is one of the development goals of the related optical equipment design industry. Summary of the invention

[0003] The present invention provides a reflector and a lighting device capable of expanding the visible range of a solid-state light source to provide uniform lighting, so as to expand the visible range of a solid-state light source and provide a white light source system with uniform lighting.

[0004] The present invention provides a reflective plate, comprising:

[0005] a reflective layer, used to reflect the illumination light beam entering the reflective plate; and

[0006] A homogenizing layer is arranged on the reflective layer, and the homogenizing layer comprises a packaging substrate and a plurality of light-homogenizing particles. The plurality of light-homogenizing particles are distributed in the packaging substrate and are made of at least one of a light-transmissive material and an opaque material. The homogenizing layer utilizes the effect of changing the light propagation direction provided by the plurality of light-homogenizing particles to enlarge the illumination range of the illumination light beam.

[0007] Preferably, the plurality of light-homogenizing particles are made by using ceramic sintering technology.

[0008] Preferably, the homogenizing layer comprises light-homogenizing particles made of the light-transmissive material, and the refractive index of the packaging substrate to the illumination light beam is higher than the refractive index of the light-transmissive light-homogenizing particles.

[0009] Preferably, the plurality of light-homogenizing particles have a rough surface to provide diffuse reflection.

[0010] Preferably, the plurality of light-homogenizing particles have a smooth surface to provide specular reflection.

[0011] Preferably, the reflective layer is a coating layer having reflective properties, and the homogenizing layer is coated on the reflective layer.

[0012] Preferably, the reflective layer is an optical element with reflective properties, and the homogenizing layer is coated on the reflective layer.

[0013] Preferably, the homogenizing layer does not have a wavelength conversion function, or the energy ratio of the wavelength conversion of the homogenizing layer is less than 50%.

[0014] Preferably, the homogenizing layer contains both translucent light homogenizing particles made of the translucent material and opaque light homogenizing particles made of the opaque material, and the translucent light homogenizing particles and the opaque light homogenizing particles are evenly mixed and distributed in various areas of the homogenizing layer.

[0015] The present invention provides a lighting device, comprising:

[0016] a solid-state light source for providing a first illumination beam having a first wavelength;

[0017] a beam splitter element disposed near the solid-state light source, allowing the first illumination beam to partially transmit and partially reflect, and allowing a second illumination beam having a second wavelength to transmit;

[0018] a wavelength conversion module, disposed at one side of the beam splitter element, receiving the first illumination light beam reflected by the beam splitter element to generate the second illumination light beam having the second wavelength; and

[0019] A reflector is arranged at a position of the light splitting element relative to the solid-state light source and the wavelength conversion module, and the reflector comprises:

[0020] a reflective layer, used for reflecting the first illumination light beam from the beam splitter; and

[0021] A homogenizing layer is arranged on the reflective layer, and the homogenizing layer includes a packaging substrate and a plurality of light-homogenizing particles. The plurality of light-homogenizing particles are distributed in the packaging substrate and are made of at least one of a light-transmissive material and an opaque material. The plurality of light-homogenizing particles are used to amplify the illumination range of the first illumination light beam so that the first illumination light beam and the second illumination light beam are mixed.

[0022] Compared with the prior art, the reflective plate of the present invention comprises a reflective layer and a homogenizing layer, wherein the reflective layer is used to reflect the illumination light beam entering the reflective plate. The homogenizing layer is arranged on the reflective layer. The homogenizing layer is formed by encapsulating a plurality of light homogenizing particles covered by a packaging substrate, wherein each light homogenizing particle is made of at least one of a light-transmissive material and an opaque material, so as to have the function of homogenizing the light beam. The homogenizing layer utilizes the function of changing the light propagation direction provided by the plurality of light homogenizing particles to enlarge the illumination range of the illumination light beam, improve the generation of laser speckle, and achieve the purpose of homogenization. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a functional block diagram of a lighting device according to an embodiment of the present invention.

[0024] Figure 2 4 is a cross-sectional view of the structure of a reflective plate according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0026] Certain words are used in the specification and claims to refer to specific components. Those with ordinary knowledge in the field should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. The position descriptions such as up, down, top, and bottom mentioned in the specification are based on the directions marked in the drawings and the definition methods that people are accustomed to, to explain the positional relationship between the components, and do not limit the actual placement or use direction of the product. The "including" mentioned throughout the specification and claims is an open-ended term, so it should be interpreted as "including but not limited to".

[0027] See also Figure 1 , Figure 1 1 is a functional block diagram of an illumination device 10 according to an embodiment of the present invention. The illumination device 10 may selectively include a solid-state light source 12, a beam splitter 14, a wavelength conversion module 16, a reflector 18, a first collimating lens 20, a second collimating lens 22, and a light guide 24. The illumination device 10 utilizes the feature of the reflector 18 that can change the propagation direction of the incident light to expand the visible range of the solid-state light source 12 to provide uniform illumination. It is mainly used in white light illumination devices that need to provide uniform illumination intensity, such as automobile headlights; but the actual application is not limited thereto. In this embodiment, the solid-state light source 12 can provide a blue light beam, and the wavelength conversion module 16 converts the blue light beam into a yellow light beam. The blue light beam and the yellow light beam are mixed to generate a white light beam and are received by the light guide 24.

[0028] The solid-state light source 12 is used to provide a first illumination beam B1 having a first wavelength, i.e., a blue light beam in this embodiment. The wavelength conversion module 16 can be disposed on the same side of the beam splitter 14 as the solid-state light source 12, and is used to receive the first illumination beam B1 reflected by the beam splitter 14 to generate a second illumination beam B2 having a second wavelength, i.e., a yellow light beam in this embodiment. The beam splitter 14 can be disposed next to the solid-state light source 12 and the wavelength conversion module 16, allowing the first illumination beam B1 to partially penetrate and partially reflect, and allowing the second illumination beam B2 having a second wavelength to penetrate. The reflector 18 is disposed at a position of the beam splitter 14 relative to the solid-state light source 12 and the wavelength conversion module 16; the reflector 18 can generate reflected light with a more uniform angular distribution.

[0029] The first collimating lens 20 may be disposed between the beam splitter element 14 and the wavelength conversion module 16. The second collimating lens 22 may be disposed on the other side of the beam splitter element 14 relative to the solid-state light source 12 and the wavelength conversion module 16. In addition, a diffuser 26 may be selectively disposed between the solid-state light source 12 and the beam splitter element 14. Therefore, after the first illumination beam B1 provided by the solid-state light source 12 passes through the diffuser 26, it will be partially reflected by the beam splitter element 14 and reach the wavelength conversion module 16 via the first collimating lens 20; the first illumination beam B1 will also partially penetrate the beam splitter element 14 to reach the reflector 18 via the second collimating lens 22.

[0030] The wavelength conversion module 16 can convert the reflected portion of the first illumination beam B1 into the second illumination beam B2, and then the second illumination beam B2 passes through the first collimating lens 20 and the beam splitter 14 and is received by the light guide 24. The reflector 18 reflects the other portion of the first illumination beam B1 that passes through the beam splitter 14 back to the beam splitter 14, and then uses the partial reflection characteristics of the beam splitter 14 to reflect the first illumination beam B1, so that the light guide 24 receives the first illumination beam B1 and mixes it with the second illumination beam B2. Therefore, the design purpose of the present invention is to use a reflector 18 of special specifications, which has a coating with a homogenizing function and a base with a reflecting function, to expand the visible range of uniform illumination provided by the lighting device 10 without generating a wavelength conversion function or under the condition that the energy ratio of the wavelength conversion is less than 50%.

[0031] See also Figure 2 , Figure 2 : is a structural cross-sectional view of the reflective plate 18 of an embodiment of the present invention. The reflective plate 18 may include at least a reflective layer 28 and a homogenizing layer 30. The reflective layer 28 is used to reflect the first illumination light beam B1 from the spectrometer 14. In this embodiment, the homogenizing layer 30 is a coating with a homogenizing function formed by encapsulating the homogenizing particles 36 with a packaging substrate 34. The homogenizing layer 30 is coated on the reflective layer 28, and the other surface of the homogenizing layer 30 relative to the reflective layer 28 is the incident surface 32, wherein the reflective layer 28 may be a coating layer with reflective properties; or, the reflective layer 28 may also be an optical element with reflective properties. The thickness ratio of the reflective layer 28 and the homogenizing layer 30 is not limited to Figure 2 The incident surface 32 of the reflector 18 refers to the upper surface of the reflector 18 where the first illumination beam B1 irradiates, and the location of the reflective layer 28 is the lower surface of the reflector 18 .

[0032] The homogenizing layer 30 is disposed on the reflective layer 28. The homogenizing layer 30 may further include a packaging substrate 34 and light homogenizing particles 36. The number, shape, density and distribution of the light homogenizing particles 36 are not limited to Figure 2In the example; a plurality of light-homogenizing particles 36 are distributed in the packaging substrate 34 and are made of at least one of a light-transmissive material and a light-opaque material, that is, the plurality of light-homogenizing particles 36 may be light-transmissive light-homogenizing particles 36 all made of light-transmissive material; or all light-opaque light-homogenizing particles 36 made of light-opaque material; or the plurality of light-homogenizing particles 36 may contain both light-transmissive light-homogenizing particles 36 made of light-transmissive material and light-opaque light-homogenizing particles 36 made of light-opaque material, and the present disclosure is not limited thereto. When the first illumination beam B1 enters the reflector 18, the characteristics of the light-transmitting material and / or the opaque material in the light-homogenizing particles 36 are utilized to allow the first illumination beam B1 to partially penetrate and partially reflect, so as to change the propagation direction of the first illumination beam B1. That is, the first illumination beam B1 penetrates the light-transmitting light-homogenizing particles 36 and is reflected by the light-transmitting light-homogenizing particles 36 and the opaque light-homogenizing particles 36, thereby enlarging the illumination range of the first illumination beam B1, so that the reflector 18 can reflect a more uniform first illumination beam B1, and mix it with the second illumination beam B2 to provide uniform illumination.

[0033] Preferably, the homogenizing layer 30 contains both translucent homogenizing particles 36 made of the translucent material and opaque homogenizing particles 36 made of the opaque material, and the translucent homogenizing particles 36 and the opaque homogenizing particles 36 are uniformly mixed and distributed in various areas of the packaging substrate 34, but the actual application is not limited to this; for example, the approximate range of the first illumination beam B1 irradiating the reflector 18 can be defined as the projection area of ​​the first illumination beam B1 relative to the reflector 18, and the translucent homogenizing particles 36 and the opaque homogenizing particles 36 are uniformly mixed, and the density of the homogenizing particles 36 in the center of the projection area can be different from the density at the edge of the projection area. It should be noted that the above-mentioned uniform Mixing refers to that within each local area of ​​the homogenizing layer 30, the number of the light-transmitting homogenizing particles 36 and the light-impermeable homogenizing particles 36 are equal or nearly equal, and does not mean that the density of all the homogenizing particles 36 in the homogenizing layer 30 is uniform; or, it is also possible that the light-transmitting homogenizing particles 36 and the light-impermeable homogenizing particles 36 are mixed in a non-uniform manner, and the homogenizing layer 30 at the center of the projection area will have more of the light-transmitting homogenizing particles 36, and the homogenizing layer 30 at the edge of the projection area will have more of the light-impermeable homogenizing particles 36, or the homogenizing layer 30 at the center of the projection area will have more of the light-impermeable homogenizing particles 36, and the homogenizing layer 30 at the edge of the projection area will have more of the light-transmitting homogenizing particles 36.

[0034] Preferably, the light-homogenizing particles 36 of the present invention are made by ceramic sintering technology, but the manufacturing process is not limited thereto. As long as a light penetration path can be formed between multiple light-homogenizing particles 36 and the light reflection efficiency of each light-homogenizing particle 36 can be improved, the design purpose of the present invention is met. Generally speaking, the light-homogenizing particles 36 can be formed into a rough surface to provide diffuse reflection, or a smooth surface to provide mirror reflection. In addition, preferably, the refractive index of the packaging substrate 34 for the first illumination light beam B1 is higher than the refractive index of the light-transmitting light-homogenizing particles 36, so that the refraction angle formed by the first illumination light beam B1 when passing through the packaging substrate 34 and the light-transmitting light-homogenizing particles 36 is greater than the incident angle, thereby providing better light divergence and homogenization effects.

[0035] The reflective plate 18 of the present invention is provided with a reflective layer 28 on the bottom surface of the homogenizing layer 30, and the light homogenizing particles 36 are coated with a packaging substrate 34 to form a coating with a homogenizing function. Preferably, the first illumination beam B1 can simultaneously penetrate the light-transmitting light homogenizing particles 36 and be reflected by the light-transmitting and / or the opaque light homogenizing particles 36. Figure 2 The two first illumination beams B1 are shown. The light homogenizing particles 36 are made by ceramic sintering technology, so the light homogenizing particles 36 are made by making non-metallic inorganic materials with ionic bonds (such as silica glass, quartz, or other silicon materials) into powder, and then sintering at high temperature to gradually grow the powder into grains. The intervals between the plurality of light homogenizing particles 36 are used to allow light to penetrate, and the rough surface or smooth surface of the light homogenizing particles 36 is used to provide diffuse reflection or mirror reflection, thereby improving the generation of laser speckle to achieve the purpose of homogenization.

[0036] In summary, the reflective plate of the present invention comprises a reflective layer and a homogenizing layer, wherein the reflective layer is used to reflect the illumination light beam entering the reflective plate. The homogenizing layer is disposed on the reflective layer. The homogenizing layer is formed by encapsulating a plurality of light homogenizing particles with a substrate, wherein each light homogenizing particle is made of at least one of a light-transmissive material and an opaque material, so as to have the function of homogenizing the light beam. The homogenizing layer utilizes the function of changing the light propagation direction provided by the plurality of light homogenizing particles to enlarge the illumination range of the illumination light beam, improve the generation of laser speckle, and achieve the purpose of homogenization.

[0037] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A reflective sheet, It is characterized in that include: A reflective layer, used to reflect the illumination light beam entering the reflective plate; as well as A homogenizing layer is arranged on the reflective layer, and the homogenizing layer comprises a packaging substrate and a plurality of light-homogenizing particles. The plurality of light-homogenizing particles are distributed in the packaging substrate and are made of at least one of a light-transmissive material and an opaque material. The homogenizing layer utilizes the effect of changing the light propagation direction provided by the plurality of light-homogenizing particles to enlarge the illumination range of the illumination light beam.

2. The reflective sheet according to claim 1, It is characterized in that The plurality of light-homogenizing particles are made by using ceramic sintering technology.

3. The reflective sheet according to claim 1, It is characterized in that The homogenizing layer includes light-homogenizing particles made of the light-transmitting material, and the refractive index of the packaging substrate to the illumination light beam is higher than the refractive index of the light-transmitting light-homogenizing particles.

4. The reflective sheet according to claim 1, It is characterized in that The plurality of light-homogenizing particles have a rough surface to provide diffuse reflection.

5. The reflective sheet according to claim 1, It is characterized in that The plurality of light-distributing particles have a smooth surface to provide mirror reflection.

6. The reflective sheet according to claim 1, It is characterized in that The reflective layer is a coating layer with reflective properties, and the homogenization layer is coated on the reflective layer.

7. The reflective sheet according to claim 1, It is characterized in that The reflective layer is an optical element with reflective properties, and the homogenizing layer is coated on the reflective layer.

8. The reflective sheet according to claim 1, It is characterized in that The homogenizing layer does not have a wavelength conversion function, or the energy ratio of the wavelength conversion of the homogenizing layer is less than 50%.

9. The reflective sheet according to claim 1, It is characterized in that The homogenizing layer contains both transmissive homogenizing particles made of the transmissive material and opaque homogenizing particles made of the opaque material, and the transmissive homogenizing particles and the opaque homogenizing particles are uniformly mixed and distributed in various areas of the homogenizing layer.

10. A lighting device, It is characterized in that include: a solid-state light source for providing a first illumination beam having a first wavelength; a beam splitter element disposed near the solid-state light source, allowing the first illumination beam to partially transmit and partially reflect, and allowing a second illumination beam having a second wavelength to transmit; A wavelength conversion module is disposed on one side of the beam splitter element, and receives the first illumination light beam reflected by the beam splitter element to generate the second illumination light beam having the second wavelength; as well as A reflector is arranged at a position of the light splitting element relative to the solid-state light source and the wavelength conversion module, and the reflector comprises: A reflective layer, used for reflecting the first illumination light beam from the light splitting element; as well as A homogenizing layer is arranged on the reflective layer, and the homogenizing layer includes a packaging substrate and a plurality of light-homogenizing particles. The plurality of light-homogenizing particles are distributed in the packaging substrate and are made of at least one of a light-transmissive material and an opaque material. The plurality of light-homogenizing particles are used to amplify the illumination range of the first illumination light beam so that the first illumination light beam and the second illumination light beam are mixed.

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