CN113669650A

CN113669650A - Reflecting device and white light laser light source

Info

Publication number: CN113669650A
Application number: CN202110565779.1A
Authority: CN
Inventors: 成华; 韩忠斌
Original assignee: Qingdao Zhongke Xincheng Lighting Technology Co ltd
Current assignee: Qingdao Zhongke Xincheng Lighting Technology Co ltd
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2021-11-19

Abstract

The invention discloses a reflecting device and a white light laser light source, wherein the white light laser light source comprises a blue light source and a white light source, wherein the blue light source is used for emitting a blue light beam; the reflecting device comprises a concave surface, the inner surface of the concave surface is a reflecting surface, and the inner surface of the concave surface is an ellipsoid; the concave surface is provided with a through hole, a blue light beam emitted by the blue light source passes through the through hole and is emitted onto the fluorescent device, and the generated yellow light and the blue light reflected by the fluorescent device are reflected and converged by the inner surface of the reflecting device to form white light; the fluorescent device and the white light output port are positioned on the opening side of the concave surface. The invention realizes the combination of blue light and yellow light by the reflection principle of the reflector, simplifies the structure of the white light laser light source and provides the luminous efficiency.

Description

Reflecting device and white light laser light source

Technical Field

The invention relates to the technical field of lighting equipment, in particular to a reflecting device and a white light laser light source.

Background

The principle of the high-brightness white light laser light source is that blue light laser excites a fluorescent material to emit yellow light, and the rest blue light laser and the yellow light emitted by the fluorescent material are transmitted in the same direction to generate a white light effect.

At present, the mode of obtaining a high-brightness white light laser light source on the market is mainly obtained by a complex optical structure and a high-power LD pumping color wheel, as shown in figure 1, a blue light laser emits blue light, and the blue light is focused, reflected, semi-reflected and refocused to strike on a fluorescent material of the color wheel, and the fluorescent material emits light; then the light emitted by the fluorescent material is focused and emitted out through the two lenses; the blue light semi-reflection part is reflected back and passes through the lens and the semi-reflection mirror, and the blue light semi-reflection part is the same as the yellow light propagation path; the yellow light and the blue light are transmitted together, and the combined light generates a white light effect.

Therefore, how to reduce the complexity of the conventional white light laser light source structure becomes an urgent problem to be solved in the field.

Disclosure of Invention

The invention aims to provide a reflecting device and a white light laser light source, which realize the combination of blue light and yellow light by the reflection principle of the reflecting device and simplify the structure of the white light laser light source.

In order to achieve the above objects, according to one aspect of the present invention, there is provided a light reflecting device comprising a concave surface, an inner surface of the concave surface being a reflecting surface, and an inner surface of the concave surface being an ellipsoid; the concave surface is provided with a through hole, and the through hole is used for light beams to pass through.

Optionally, the reflector further includes a housing, the concave surface is disposed in the housing, and the housing is provided with an aperture corresponding to the through hole.

Optionally, an outer surface of the concave surface opposite to the opening of the ellipsoid is a plane, an entity is arranged between the plane and the ellipsoid, and a channel communicated with the through hole is arranged on the entity.

Optionally, the inner surface of the concave surface is plated with a reflective film, or the inner surface of the concave surface is polished into a reflective surface.

Optionally, the material of the light reflecting device is at least one of metal, plastic and glass.

In another aspect, the present invention provides a white light laser light source, including:

a blue light source for emitting a blue light beam;

the reflecting device comprises a concave surface, the inner surface of the concave surface is a reflecting surface, and the inner surface of the concave surface is an ellipsoid; the concave surface is provided with a through hole, a blue light beam emitted by the blue light source passes through the through hole and is emitted onto the fluorescent device, and the generated yellow light and the blue light reflected by the fluorescent device are reflected and converged by the inner surface of the reflecting device to form white light; the fluorescent device and the white light output port are positioned on the opening side of the concave surface.

Optionally, the fluorescent lamp further comprises a first converging unit, wherein the first converging unit comprises at least one first focusing lens, and the first converging unit is arranged on an emergent light path of the blue light source and used for shaping and converging the blue light beam on the fluorescent device.

Optionally, the first converging unit further includes a first reflecting mirror, and the first reflecting mirror is disposed on the outgoing light path of the blue light source and is configured to change the propagation direction of the blue light beam.

Optionally, the white light shaping device further comprises an output device, wherein the output device is located at the white light exit port of the light reflecting device and is used for shaping and outputting the white light.

Optionally, the output device comprises at least one second focusing mirror and/or at least one second mirror; the second focusing lens is used for converging the white light; the second reflector is used for changing the propagation direction of the white light.

Optionally, the fluorescent device is a color wheel or a fluorescent film sheet; the area coated with the fluorescent material on the color wheel is positioned at the position irradiated by the blue light beam; the fluorescent film is positioned at the position irradiated by the blue light beam.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the invention provides a reflector, which comprises a concave surface, wherein the inner surface of the concave surface is a reflecting surface, and the inner surface of the concave surface is an ellipsoid; the concave surface is provided with a through hole for light beams to pass through; because the ellipsoid has two focuses, light is emitted at one focus (namely the position of the fluorescent material), and converged light is formed at the other focus (namely the white light output port), so that the functions of light reflection, light splitting, light convergence, light combination and the like can be realized through the light reflecting device. The white light laser light source comprising the reflecting device saves optical elements such as a blue light reflector, a blue light reflex lens group, a spectroscope and the like in the traditional light path, greatly simplifies the structure of the white light laser light source, reduces the structural complexity, reduces the cost and reduces the volume of the white light laser light source; and through the through hole on the reflecting device, the blue light directly irradiates the fluorescent device, thereby avoiding light loss caused by multiple refraction and reflection, light splitting and other modes in the traditional light path and improving the luminous efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a structural view of a light reflecting device provided in embodiment 1 of the present invention;

fig. 2 is a structural view of one embodiment of a light reflecting device provided in example 1 of the present invention;

FIG. 3 is a planer view of FIG. 2;

fig. 4 is a schematic view of an optical path of a light reflecting device provided in embodiment 1 of the present invention;

fig. 5 is a schematic view of an optical path of a light reflecting device provided in embodiment 1 of the present invention;

fig. 6 is a schematic view of an optical path of a light reflecting device provided in embodiment 1 of the present invention;

fig. 7 is a perspective view of a white light laser light source provided in embodiment 2 of the present invention;

fig. 8 is a front view of a white light laser light source provided in embodiment 2 of the present invention;

fig. 9 is a cross-sectional view of a white laser light source provided in embodiment 2 of the present invention;

fig. 10 is a schematic diagram of an optical path of a white light laser light source provided in embodiment 2 of the present invention;

fig. 11 is a structural diagram of a color wheel in a white light laser light source according to embodiment 2 of the present invention;

fig. 12 is a structural diagram of a color wheel in a white light laser light source according to embodiment 2 of the present invention;

fig. 13 is a structural diagram of a fluorescent film in a white light laser light source provided in embodiment 2 of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example 1

As shown in fig. 1, the light reflecting device 1 provided in this embodiment 1 includes a concave surface 11, an inner surface of the concave surface 11 is a reflective surface, and an inner surface of the concave surface 11 is an ellipsoid; the concave surface 11 is provided with a through hole 12, and the through hole 12 is used for passing light beams.

The reflecting device 1 is a reflecting and condensing element, can be a metal workpiece, and has a reflecting surface formed by polishing and electroplating the inner surface; the reflecting surface can also be formed by optical coating on the inner surface of other materials such as plastic, glass and the like. Variations in the materials of the reflector cup and variations in the method of making the reflective surface are within the scope of the present invention.

In this embodiment, for the convenience of installation and arrangement with other devices, the outer surface of the concave surface 11 of the reflector 1 opposite to the opening of the ellipsoid is a plane 13, as shown in fig. 2 and 3, a solid is arranged between the plane 11 and the ellipsoid, and the solid is provided with a channel 14 communicated with the through hole 12. In fact, the shape of the outer surface does not affect the inner reflection surface of the concave surface 11, and therefore, as long as the concave surface is included, whether the outer part of the concave surface is provided with the shell or is provided with any other shape, the outer decoration and the installation assistance function are only provided, and therefore, the invention is within the protection scope. Similarly, the open side of the concave surface, i.e., the lower surface shown in fig. 1-3, is provided with a flat step at a portion beyond the concave surface 11, so that the presence or absence of the step and the change in the shape of the step cannot avoid the present invention without affecting the internal reflection surface of the concave surface 11 for the convenience of assembly.

Therefore, this embodiment provides another embodiment, as shown in fig. 2, that is, the light reflecting device 1 further comprises a housing 15, the concave surface 11 is disposed in the housing 15, and the housing 15 is provided with an aperture corresponding to the through hole. The housing shown in fig. 2 is cylindrical in shape and may be any practical housing shape that can accommodate the recessed surface 11.

The working principle of the light reflecting device 1 is explained in detail below:

the inner surface of the concave surface 11 is an ellipsoid, and since the ellipsoid has two focal points, light is emitted at one focal point, and a converged light is formed at the other focal point. The surface type of the ellipsoid is designed according to the sizes of the focus points of different blue light beams, the thickness of a fluorescent material on a fluorescent device, the scattering rate of the fluorescent material, the shape of a light spot to be actually obtained, the energy density of the light spot to be actually obtained, the aberration of the light spot to be actually obtained and the like. The design process of the ellipsoid shape can be designed according to actual needs, the change of the surface shape obtaining process cannot avoid the protection range of the invention, and the protection range of the invention is within as long as the reflecting device with the same function as the reflecting device is obtained.

The through hole 12 of the concave surface 11, i.e. one focus of the ellipsoid, functions to pass the blue laser beam. The position of the through hole 12 may be the center of the concave surface 11, or the edge of the concave surface 11, as shown in fig. 4-6, the propagation form of the blue laser beam is slightly different at different hole positions, but the corresponding light path principle is the same, i.e. no matter the blue laser beam is obliquely converged on the fluorescent material or perpendicularly converged on the fluorescent material, finally, the blue laser beam is converged on the fluorescent material, and the light emitting point of the fluorescent material is located at the first focus of the ellipsoid, then the fluorescent material emits light, the split light of the blue light is reflected to be combined with the yellow light emitted by the fluorescent light to form white light, and the white light is converged on the second focus to be emitted.

Example 2

As shown in fig. 7-10, the present embodiment provides a white light laser light source, which includes a blue light source 2, a light reflecting device 1 and a fluorescent device 3.

The blue light source 2 is for emitting a blue light beam. The blue light source 2 is a laser element for providing blue light laser, and is a general component on the market, such as a blue laser manufactured by manufacturers such as Niya, Oselan, Sharpu, and the like. The laser element primarily functions to provide blue laser light.

In practical applications, the blue light source 2 may be a single blue laser tube, or a plurality of blue laser tubes, or a blue laser module, or a blue laser array, and the forms of providing blue light laser are many, which will not be described in detail herein, and the blue light source 2 only needs to emit a blue light beam and is within the protection scope of the present invention. The embodiment adopts the blue light source 2 which is shaped, and can provide a collimated and parallel-like blue light laser array, so that the utilization rate of blue light can be improved.

The reflecting device 1 comprises a concave surface 11, the inner surface of the concave surface 11 is a reflecting surface, and the inner surface of the concave surface 11 is an ellipsoid; the concave surface is provided with a through hole 12, a blue light beam emitted by the blue light source 2 passes through the through hole 12 and is emitted onto the fluorescent device 3, and the generated yellow light and the blue light reflected by the fluorescent device 3 are reflected and converged by the inner surface of the reflecting device 1 to form white light; the fluorescent device 3 and the white light output port are located on the opening side of the concave surface 11.

It should be noted that the light reflecting device 1 used in this embodiment is any one of the light reflecting devices 1 described in embodiment 1, and therefore any modification of the light reflecting device 1 is within the protection scope of the white light laser light source.

In order to improve the light emitting efficiency, the incident angle of the blue light source can be set, and the fluorescent material on the fluorescent device is just at the first focus. The white light output port is located at the second focus, and for the specific principle, refer to embodiment 1, which is not described herein again.

The fluorescent device 3 is a device coated with a fluorescent material, which is a photoluminescent material, and in the present invention, the fluorescent material emits yellow light after being irradiated by blue light, and the yellow light and the blue light are mixed and transmitted to generate a white light effect.

The fluorescent device 3 in this embodiment may be a color wheel, as shown in fig. 11 to 12, which includes a motor 34, a rotating wheel 33 connected to an output shaft of the motor 34, a fluorescent material 32 disposed on a surface of the rotating wheel 33, a power line and a circuit board 31 connected to the motor 34, and a rotating wheel fixing member 35. The motor 34 is an electric element which utilizes electromagnetic induction and electrified rotation and provides a main power source for the rotation of the color wheel; the power cord and circuit board 31 provides wiring and circuit switching for the motor 34; the rotating wheel 33 is used for bearing the fluorescent material 32 and is fixed on the motor 34 to drive the fluorescent material 32 to rotate, particularly, the material of the rotating wheel 33 is generally metal, and can also be sapphire, ITO glass, quartz and the like, and the material replacement of the rotating wheel 33 cannot avoid the protection range of the invention; the wheel fixing member 35 is a structural member for fixing the wheel 33 to the motor 34; the fluorescent material 32 is a photoluminescent material in the present embodiment.

The color wheel mainly functions in providing a photoluminescent fluorescent material, and can rotate due to the motor 34, continuously change the luminous position, reduce the heating effect, rotate at a high speed, and quickly take away heat, so that the color wheel can bear a high-power blue light pump and is not damaged. The structure of the color wheel is not limited to the above description, and a fluorescent device capable of rotationally converting the position of the fluorescent material is within the scope of the present invention.

The color wheel is adopted in the embodiment because the color wheel can bear high-power pumping, and then the white light laser light source can realize high brightness.

The color wheel is a dynamic fluorescent material device, the fluorescent device 3 in this embodiment may also be a fluorescent diaphragm, which is a static fluorescent material carrying device, and both are fluorescent material devices coated with photoluminescent materials. The membrane typically uses a metal or other thermally conductive material as a substrate and is then coated with a fluorescent material, as shown in fig. 13.

Because the fluorescent film has small volume and does not rotate statically, the heat dissipation capability is relatively poor, and the fluorescent film can not bear high-power pumping generally, so that the luminous brightness of a light source made of the fluorescent film is lower than that of a light source made of a color wheel. In practical applications, the appropriate fluorescent device 3 can be selected according to the brightness requirement.

As an optional implementation manner, the white light laser light source further includes a first converging unit 4, as shown in fig. 7 to 10, where the first converging unit 4 includes at least one first focusing lens, and the first converging unit is disposed on an outgoing light path of the blue light source 2 and is used for shaping and converging the blue light beam on the fluorescent device 3.

The first converging unit 4 is used for focusing the parallel light beams, when the blue light source 2 which is not shaped or the blue light source 2 which is not shaped in place and has a certain divergence angle is used, at least 1 first focusing lens can be used for converging the blue light beams on the fluorescent material, the surface type of the first focusing lens is different from that of the focusing lens using the parallel blue light beams, but the focusing lens 1 also has the function of converging. In some alternative embodiments, the first focusing unit 4 may comprise two, three, or even more first focusing mirrors, as long as the blue light beam is focused on the fluorescent material.

As for the surface type of the first focusing lens, the first focusing lens can be a spherical surface, and the focusing effect is generally lower than 1 aspheric surface, namely, the blue light energy is wasted more and the efficiency is low. Or 1 aspheric lens, the cost price of 1 aspheric surface is higher than that of two spherical lenses, and the two spherical lenses can also realize the optical function of 1 aspheric lens. Therefore, the surface type of the first focusing lens can be properly selected according to actual requirements.

The first converging unit 4 may also have another embodiment, that is, the light is not converged on the fluorescent material, and the focusing point has a certain distance from the fluorescent material, so that the light spot is not as small as the focal point, the power density is smaller than that at the focal point, and the conversion efficiency of the fluorescent material is low, but the function of the invention can still be realized, therefore, the light is not focused on the fluorescent material, and the protection range of the invention cannot be avoided.

In addition, the first converging unit 4 may further include a first reflector, and the first reflector is disposed on the outgoing light path of the blue light source 2 and is used for changing the propagation direction of the blue light beam. This first speculum can set up between blue light source 2 and first focusing mirror, also can set up between first focusing mirror and through-hole 12, can change the light path like this, just also can set up blue light source 2 and reflex reflector 1 as required. Of course, it is within the scope of the present invention to arrange optical elements such as a diffuser, a beam splitter, etc. on the path of the blue light beam to the fluorescent material.

As another optional embodiment, the white light laser light source further includes an output device 5, where the output device 5 is located at the white light exit port of the light reflecting device 1, and is used to shape and output white light.

The output device 5 may comprise at least one second focusing mirror and/or at least one second mirror; the second focusing lens is used for converging the white light; the second mirror is used for changing the propagation direction of the white light.

The output device 5 in this embodiment includes two second focusing mirrors, which are used to shape and output the yellow light and the blue light, so as to achieve the effect of outputting white light. Of course, the output device 5 may also include 1, 2, 3, or even more second focusing mirrors, which need to be selected according to the actual design requirement, but it is within the protection scope of the present invention.

The output device 5 may also comprise a mirror if the output path of the white light is to be changed

It is emphasized that the light reflecting device 1 can be disposed on the white light output path, and white light can be realized, which can be selected according to the actual design requirement, but is within the protection scope of the present invention.

In addition, the output device 5 may also use a lens to couple out with an optical fiber, or use no lens to directly couple out with an optical fiber, which is within the protection scope of the present invention.

It should be noted that the material of the first focusing mirror and the second focusing mirror may be glass, plastic, quartz, sapphire, etc. The surface types of the first focusing lens and the second focusing lens can be biconvex, plano-convex, meniscus-convex and the like, and are spherical and aspheric.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. A light reflecting device, comprising a concave surface, wherein the inner surface of said concave surface is a reflecting surface and the inner surface of said concave surface is an ellipsoid; the concave surface is provided with a through hole, and the through hole is used for light beams to pass through.

2. The reflector device of claim 1, further comprising a housing, wherein the concave surface is disposed within the housing, and wherein the housing has an aperture corresponding to the through hole.

3. The reflector device as claimed in claim 1, wherein the outer surface of the concave surface opposite to the opening of the ellipsoid is a plane, a solid body is provided between the plane and the ellipsoid, and the solid body is provided with a channel communicating with the through hole.

4. The light reflecting device according to claim 1, wherein the inner surface of the concave surface is coated with a reflective film or the inner surface of the concave surface is polished to a reflective surface.

5. A white light laser light source, comprising:

a blue light source for emitting a blue light beam;

6. The white light laser light source of claim 6, further comprising a first converging unit, wherein the first converging unit comprises at least one first focusing lens, and the first converging unit is disposed on an outgoing light path of the blue light source and is configured to shape and converge the blue light beam on the fluorescent device.

7. The white light laser light source of claim 7, wherein the first converging unit further comprises a first reflector, and the first reflector is disposed on the exit light path of the blue light source and is configured to change the propagation direction of the blue light beam.

8. The white light laser light source of claim 6, further comprising an output device located at the white light exit port of the light reflecting device for shaping and outputting white light.

9. The white-light laser light source of claim 9, wherein the output device comprises at least one second focusing mirror and/or at least one second reflecting mirror; the second focusing lens is used for converging the white light; the second reflector is used for changing the propagation direction of the white light.

10. The white light laser light source of claim 6, wherein the fluorescent device is a color wheel or a fluorescent film sheet; the area coated with the fluorescent material on the color wheel is positioned at the position irradiated by the blue light beam; the fluorescent film is positioned at the position irradiated by the blue light beam.