CN218762758U - Laser light source and lighting device - Google Patents

Abstract

The application discloses laser light source and lighting device belongs to the projection display field. The laser light source includes: the backlight module comprises a first laser, a first light guide part, a second light guide part, a fluorescent component and a light outlet. The fluorescent light generated by the fluorescent light component arranged at the bottom of the light guide cavity in the second light guide part and excited by the first laser emitted by the first laser is conducted in the light guide cavity and emitted to the first light guide part. Even if the fluorescence is reflected to the inner side wall of the light guide cavity, the fluorescence is reflected by the inner side wall of the light guide cavity and then emitted to the first light guide part. Therefore, most of the fluorescent light generated by the fluorescent component through excitation can be reflected to the first light guide part and then reflected to the light outlet of the laser light source through the first light guide part, and the light utilization rate of the fluorescent light of the lighting device integrated with the laser light source is effectively improved.

Description

Laser light source and lighting device

Technical Field

The application relates to the field of projection display, in particular to a laser light source and a lighting device.

Background

With the development of the optoelectronic technology, the brightness requirement for the light emitted by the lighting device is higher and higher. High brightness lighting devices are commonly used in medical lighting and projection displays.

Currently, lighting devices generally comprise: laser light sources and other optical components. The laser light source generally includes: laser instrument, diffusion piece, dichroic mirror, collimating mirror group, fluorescence colour wheel and relay circuit mirror group. The fluorescent color wheel has a laser transmission area and an excitation area coated with phosphor. The relay loop lens group includes: the optical path turning system consists of a plurality of lenses and a plurality of reflectors. Laser beams emitted by the laser are diffused by the diffusion sheet, penetrate through the dichroic mirror, are converged by the collimating mirror group and then are guided to the fluorescent color wheel. When the laser beam irradiates the laser transmission area on the fluorescent color wheel, the laser beam passes through the laser transmission area, is bent by the relay circuit lens group and is emitted out through the dichroic mirror. When the laser beam irradiates the excitation area coated with the fluorescent powder, the laser beam excites the fluorescent powder to emit fluorescent light, and the fluorescent light is reflected and then is collimated by the collimating mirror group and then is guided to the dichroic mirror. The laser beam reflected by the dichroic mirror is combined with the laser beam transmitted through the dichroic mirror and guided to other optical components (e.g., a dodging component) at the rear end.

However, the fluorescence emitted by the fluorescent powder excited by the laser beam is substantially lambertian, so that only a part of the fluorescence is collimated by the collimating lens group and then guided to a subsequent light path, and further the light utilization rate of the illumination device for the fluorescence is low.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a laser light source and a lighting device. The problem that the lighting device in the prior art is low in light utilization rate of fluorescence can be solved, and the technical scheme is as follows:

in one aspect, a laser light source is provided, the laser light source comprising:

the first laser, the first light guide part, the second light guide part, the fluorescent component and the light outlet;

the first light guide part is positioned between the first laser and the second light guide part, the second light guide part is provided with a light guide cavity, one side of the light guide cavity facing the first light guide part is provided with a light inlet, and the fluorescent component is positioned in the light guide cavity and fixed at the bottom opposite to the light inlet;

the first laser emitted by the first laser can be guided to the fluorescent component in the light guide cavity through the first light guide part, the fluorescent component generates fluorescence under the excitation action of the first laser and reflects the fluorescence to the first light guide part, and the first light guide part reflects the fluorescence to the light outlet.

In another aspect, there is provided a lighting device, including:

the laser device comprises a laser light source and a light homogenizing assembly, wherein the laser light source is any one of the laser light sources.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

a laser light source may include: the backlight module comprises a first laser, a first light guide part, a second light guide part, a fluorescent component and a light outlet. The fluorescent light generated by the fluorescent light component arranged at the bottom of the light guide cavity in the second light guide part and excited by the first laser emitted by the first laser is conducted in the light guide cavity and emitted to the first light guide part. Even if the fluorescence is reflected to the inner side wall of the light guide cavity, the fluorescence is reflected by the inner side wall of the light guide cavity and then emitted to the first light guide part. Therefore, most of the fluorescent light generated by the excited fluorescent component can be reflected to the first light guide part and then reflected to the light outlet of the laser light source through the first light guide part, and the light utilization rate of the lighting device to the fluorescent light is effectively improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a laser light source provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of another laser light source provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another laser light source provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of another laser light source provided in an embodiment of the present application;

fig. 5 is a schematic structural diagram of a laser light source according to another embodiment of the present disclosure;

FIG. 6 is a schematic diagram of another laser light source according to another embodiment of the present disclosure;

fig. 7 is a block diagram of a lighting device according to an embodiment of the present application.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a laser light source according to an embodiment of the present disclosure. The laser light source 000 may include: a first laser 100, a first light guide portion 200, a second light guide portion 300, a fluorescent member 400, and a light outlet 500.

The first light guide part 200 of the laser light source 000 may be positioned between the first laser 100 and the second light guide part 300. The second light guide part 300 of the laser light source 000 may have a light guide cavity 301, a side of the light guide cavity 301 facing the first light guide part 200 may have a light inlet 301a, and the fluorescent component 400 of the laser light source 000 may be located in the light guide cavity 301 of the second light guide part 300 and fixed at a bottom portion opposite to the light inlet 301a of the light guide cavity 301.

The first laser light emitted from the first laser 100 in the laser light source 000 can be guided to the fluorescent member 400 in the light guide cavity 301 in the second light guide portion 300 through the first light guide portion 200. The fluorescent member 400 can generate fluorescence by excitation of the first laser beam and reflect the fluorescence toward the first light guide portion 200, and the first light guide portion 200 can reflect the fluorescence toward the light exit opening 500 of the laser light source 000.

Among them, the first laser 100 in the laser light source 000 may be used to emit blue laser light to the first light guide part 200, and the wavelength of the blue laser light may be 445 nm to 470 nm. In this manner, the fluorescent member 400 is excited by the blue light having a short wavelength to generate fluorescence. For example, the first Laser 100 may be a semiconductor (LD) Laser, which emits Laser beams with good directivity and controllability and a small etendue. Thus, the etendue of the laser beam emitted from the LD laser is small. Therefore, the subsequent optical system can receive light conveniently, and the utilization efficiency of light energy is effectively improved. It should be noted that, in other possible implementations, the first laser may also use other types of excitation Light sources, such as a Light Emitting Diode (LED).

In the embodiment of the present application, the first laser 100 in the laser light source 000 may emit the first laser light, and the first laser light is first emitted to the first light guide portion 200; then, the first laser beam passes through the first light guide part 200 and is emitted to the fluorescent member 400 disposed at the bottom of the light guide cavity 301 through the light inlet 301a of the second light guide part 300; then, the fluorescent member 400 generates fluorescence under the excitation of the first laser light, and reflects the fluorescence toward the first light guide portion 200; finally, the first light guide unit 200 reflects the fluorescence toward the light exit opening 500. In this case, the fluorescent light generated due to the excitation of the fluorescent light assembly 400 by the first laser light is conducted within the light guide cavity 301 in the second light guide part 300 and directed towards the first light guide part 200. And even if the fluorescence is reflected to the inner sidewall of the light guide cavity 301, the fluorescence is reflected by the inner sidewall of the light guide cavity 301 and then emitted to the first light guide portion 200. Therefore, most of the fluorescent light generated by the fluorescent component 400 under excitation can be reflected to the first light guide portion 200 and then reflected to the light outlet 500 of the laser light source 000 through the first light guide portion 200, which effectively improves the light utilization rate of the fluorescent light of the lighting device integrated with the laser light source 000.

In summary, the embodiment of the present application provides a laser light source, which may include: the backlight module comprises a first laser, a first light guide part, a second light guide part, a fluorescent component and a light outlet. The fluorescent light generated by the fluorescent light component arranged at the bottom of the light guide cavity in the second light guide part and excited by the first laser emitted by the first laser is conducted in the light guide cavity and emitted to the first light guide part. Even if the fluorescence is reflected to the inner side wall of the light guide cavity, the fluorescence is reflected by the inner side wall of the light guide cavity and then emitted to the first light guide part. Therefore, most of the fluorescent light generated by the fluorescent component after being excited can be reflected to the first light guide part and then reflected to the light outlet of the laser light source through the first light guide part, and the light utilization rate of the fluorescent light of the lighting device integrated with the laser light source is effectively improved.

Optionally, please refer to fig. 2, and fig. 2 is a schematic structural diagram of another laser light source provided in the embodiment of the present application. The inner wall of the light guide cavity 301 in the second light guide part 300 may have a reflective film 301b thereon, and the reflective film 301b may reflect at least a part of the first laser light emitted from the first laser 100 toward the fluorescent member 400 and reflect at least a part of the fluorescent light generated by the fluorescent member 400 excited by the first laser toward the first light guide part 200 in the laser light source 000. In this case, by providing the reflective film 301b on the inner wall of the light guide cavity 301 in the second light guide part 300, when the first laser light is emitted to the second light guide part 300 through the first light guide part 200, at least a part of the first laser light may be emitted to the reflective film 301b, and the reflective film 301b can reflect the part of the first laser light and finally emit the part of the first laser light to the fluorescent member 400. The fluorescent member 400 generates fluorescence under the excitation of the first laser, and there may be some fluorescence reflected by the lambertian fluorescence toward the reflective film 301b, and the reflective film 301b can finally reflect the fluorescence toward the first light guide portion 200.

In the embodiment of the present application, please refer to fig. 3, and fig. 3 is a schematic structural diagram of another laser light source provided in the embodiment of the present application. The inner wall of the light guide cavity 301 in the second light guide part 300 may be a curved surface. In the present application, when the inner wall of the light guide cavity 301 in the second light guide part 300 is a curved surface, the arc of the curved surface may be parabolic. For example, the second light guide part 300 may be a Compound Parabolic Concentrator (CPC) 300a. The CPC300a has a light entrance 301a facing the first light guide unit 200, and the fluorescent member 400 is provided at the bottom of the CPC300a disposed opposite to the light entrance 301 a. The first laser beam is emitted into the light guide cavity 301 of the CPC300a through the light inlet 301a of the CPC300a, and the first laser beam incident on the inner wall of the CPC300a is reflected and emitted to the fluorescence component 400 to generate fluorescence. The fluorescent light is reflected by the fluorescent component 400, and then reflected again by the inner wall of the CPC300a to the first light guide part 200. Thus, the light utilization rate of the fluorescence generated after the fluorescence assembly 400 is excited is effectively improved. It should be noted that, in order to ensure that all of the first laser light incident on the CPC300a can be emitted to the fluorescence component 400, an included angle α 1 between the first laser light incident on the CPC300a and the central axis L of the CPC300a needs to be controlled to be smaller than or equal to the maximum incidence angle α of the CPC. For this, the laser light source 000 may further include: a converging portion 600, the converging portion 600 may be located between the first laser 100 and the first light directing portion 200. The light angle of the first laser beam emitted from the first laser 100 to the second light guide portion 300 can be adjusted by the converging portion 600, so that as much of the first laser beam as possible is reflected to the fluorescent component 400 through the CPC300a after being emitted to the CPC300 a. In other possible implementations, the angle at which the emitted first laser light is emitted to the second light guide portion 300 may be adjusted by the first laser 100 itself, which is not specifically limited in the embodiment of the present application. For example, the converging portion 600 may be a converging lens, such as a biconvex lens, which is not specifically limited in this application. Wherein the central axis of the converging lens may coincide with the central axis L of the CPC300a, which ensures maximization of the first laser light receiving rate by the CPC300 a.

It is also noted that the fluorescence assembly 400 is located at the bottom of the CPC300 a. Therefore, the fluorescence generated by the first laser-excited fluorescence assembly 400, of which the light angle is smaller than or equal to the maximum incident angle α of the CPC300a, directly exits to the first light guide portion 200. The part of the fluorescence with the ray angle larger than the maximum incident angle α of the CPC300a is reflected by the CPC300a and exits to the first light guide portion 200 at the maximum incident angle α smaller than or equal to the CPC300 a. Thus, the fluorescence with small angle in the fluorescence of the lambertian body can be emitted to the first light guiding portion 200, and the fluorescence with large angle is also emitted to the first light guiding portion 200, and is reflected to the light outlet 500 by the first light guiding portion 200, so that the light utilization rate of the fluorescence is effectively improved.

In the embodiment of the present application, as shown in fig. 3, an orthographic projection of the first light guide part 200 in the laser light source 000 on a plane where the light inlet 301a of the light guide cavity 301 in the second light guide part 300 is located may cover an area where the light inlet 301a is located. In this case, by covering the first light guide part 200 with the area where the light inlet 301a of the light guide cavity 301 is located, all the fluorescent light generated by the fluorescent light assembly 400 being excited can be emitted to the first light guide part 200, and then all the fluorescent light is reflected by the first light guide part 200 to the light outlet 500 of the laser light source 000. Further effectively improving the light utilization rate of the fluorescence.

Optionally, there are various optional implementations of the first light guide portion 200 in the laser light source 000, and the following two optional implementations are provided in the embodiment of the present application for illustrative purposes:

referring to fig. 4, fig. 4 is a schematic structural diagram of another laser light source according to an embodiment of the present disclosure. The first light guide unit 200 of the laser light source 000 may be a reflector 201, and the first light guide unit 200 may have a light passing hole 201a. In this way, the first laser beam can be guided to the second beam guide unit 300 through the light passage hole 201a in the first beam guide unit 200. After the fluorescence generated by the fluorescence module 400 is emitted to the reflecting mirror 201, the fluorescence can be reflected by the reflecting mirror 201 to the light outlet 500. In the present application, when the converging portion 600 is disposed between the first laser device 100 and the first light guide portion 200, the light passing hole 201a in the reflector 201 may be disposed at a focal point of the converging portion 600, so that the first laser light can be focused by the converging portion 600 and then all of the first laser light can be emitted to the second light guide portion 300 through the light passing hole 201a in the reflector 201.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a laser light source according to another embodiment of the present disclosure. First light guide portion 200 may be a dichroic mirror 202. In the present application, when first light guide portion 200 is dichroic mirror 202, dichroic mirror 202 may be a dichroic mirror that transmits blue light and reflects fluorescent light. In this way, the first laser light emitted from the first laser device 100 can be transmitted through the dichroic mirror 202 to the second light guide unit 300, and the fluorescent light generated by excitation of the fluorescent member 400 can be transmitted to the dichroic mirror 202 and then reflected by the dichroic mirror 202 to the light outlet 500. When the converging portion 600 is provided between the first laser 100 and the first light guide portion 200, the center point of the dichroic mirror 202 may be overlapped with the focal point of the converging portion 600.

In the embodiment of the present application, please refer to fig. 6, and fig. 6 is a schematic structural diagram of another laser light source provided in another embodiment of the present application. One surface of the first light guide unit 200 of the laser light source 000 facing the second light guide unit 300 may be a curved reflection surface a1, and the curved reflection surface a1 may be a concave surface. In this case, by providing the curved reflective surface a1 on the surface of the first light guide unit 200 facing the second light guide unit 300, the fluorescent light emitted to the surface of the first light guide unit 200 close to the second light guide unit 300 can be emitted to the light exit opening 500 as a collimated light beam, and the directivity and controllability of the fluorescent light are improved. In other possible implementations, a surface of the first light guide portion 200 facing the second light guide portion 300 may be a flat surface, which is not specifically limited in the embodiments of the present application. As mentioned above, the reflector 201 may be a flat reflector, a curved reflector or a free-form reflector. Or the dichroic mirror 202 may be a flat mirror, a curved mirror, or a free-form mirror.

Alternatively, as shown in fig. 5, when first light guide portion 200 in laser light source 000 is dichroic mirror 202, laser light source 000 may further include: in the second laser device 700, the second laser beam emitted from the second laser device 700 may be transmitted through the first light guide part 200 and emitted to the light exit 500 of the laser light source 000 in synchronization with the fluorescence reflected from the fluorescence assembly 400 to the first light guide part 200. The second laser 700 may be used to emit blue laser light to the first light guide portion 200. Thus, the blue light with short wavelength and the fluorescence generated by the fluorescence component 400 are combined to form white light, and the color rendering property of the white light formed by combining the light is better. The second Laser 700 may be, for example, a semiconductor (Laser Diode, LD) Laser or a Light Emitting Diode (LED). In this case, the laser beams emitted from the first laser 100 and the second laser 700 in the laser light source 000 need to be combined to form white light only by the cooperation of the first light guide part 200, the second light guide part 300 and the fluorescent member 400. Therefore, the number of optical devices included in the laser light source 000 is reduced, and the volume of the entire laser light source 000 is reduced. Thus, the overall volume of the lighting device into which the laser light source 000 is integrated is made small. For example, the arrangement direction of the first laser 100, the converging portion 600, the first light guide portion 200, and the second light guide portion 300 in the laser light source 000 may be perpendicular to the arrangement direction of the second laser 700 and the first light guide portion 200.

In the embodiment of the present application, as shown in fig. 5, the fluorescent member 400 in the laser 000 may include: a reflection portion 401, and a fluorescent portion 402 located on the side of the reflection portion 401 closer to the first light guide portion 200. Thus, when the first laser beam is irradiated onto the fluorescent portion 402 in the fluorescent member 400, the first laser beam excites the fluorescent material located on the fluorescent portion 402, the fluorescent material generates fluorescent light by the excitation of the first laser beam, and the reflecting portion 401 reflects the fluorescent light.

In the present application, the phosphor assembly 400 may be a stationary phosphor assembly, e.g., a stationary phosphor plate. The fixed fluorescent component does not need to be provided with a driving part, so that the occupied space of the fluorescent component in the laser light source 000 is favorably reduced, and the miniaturization design of the laser light source 000 is favorably realized. In some special optical systems, the non-fixed fluorescent components alternately generate fluorescent light under the driving of the driving component, but the driving component may vibrate when driving the fluorescent components to rotate, which may affect the reliability of the system. And the fixed fluorescent component can effectively avoid the bad phenomenon that the fluorescent component vibrates relatively to the non-fixed fluorescent component.

Alternatively, the fluorescent material on the fluorescent part 402 in the fluorescent member 400 may be formed by bonding separated phosphors into layers by an organic adhesive such as silicon gel or epoxy resin; or, the separated phosphor is bonded into layers by an inorganic adhesive such as glass; alternatively, the phosphor material may be a phosphor ceramic, which is a structure having a continuous ceramic as a medium and phosphor particles distributed in the ceramic. The fluorescent material is not particularly limited in the examples of the present application.

In summary, the embodiment of the present application provides a laser light source, which may include: the backlight module comprises a first laser, a first light guide part, a second light guide part, a fluorescent component and a light outlet. The fluorescence component arranged at the bottom of the light guide cavity in the second light guide part is excited by the first laser light emitted by the first laser to generate fluorescence, and the fluorescence is conducted in the light guide cavity and emitted to the first light guide part. Even if the fluorescence is reflected to the inner side wall of the light guide cavity, the fluorescence is reflected by the inner side wall of the light guide cavity and then emitted to the first light guide part. Therefore, most of the fluorescent light generated by the fluorescent component after being excited can be reflected to the first light guide part and then reflected to the light outlet of the laser light source through the first light guide part, and the light utilization rate of the fluorescent light of the lighting device integrated with the laser light source is effectively improved.

An embodiment of the present application further provides a lighting device, please refer to fig. 7, and fig. 7 is a block diagram of a structure of the lighting device provided in the embodiment of the present application. The lighting device may include: a laser light source 000 and a dodging assembly 001. The laser light source 000 may be any of the laser light sources given in the above embodiments. The laser beams emitted by the laser light source 000 are combined and then guided to the light uniformizing assembly 001, and the light uniformizing assembly 001 can uniformize the laser beams. The illumination device can be applied to medical illumination. For example, the light homogenizing assembly 001 may be a fly-eye lens or a light guide, which is not specifically limited in this embodiment.

It should be noted that the laser light source 000 may also be applied to a laser projection apparatus to provide an illumination beam for imaging of the laser projection apparatus.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is intended only to illustrate the alternative embodiments of the present application, and should not be construed as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A laser light source, comprising: the first laser, the first light guide part, the second light guide part, the fluorescent component and the light outlet;

the first light guide part is positioned between the first laser and the second light guide part, the second light guide part is provided with a light guide cavity, one side of the light guide cavity facing the first light guide part is provided with a light inlet, and the fluorescent component is positioned in the light guide cavity and fixed at the bottom opposite to the light inlet;

the first laser emitted by the first laser can penetrate through the first light guide part and be guided to the fluorescent component in the light guide cavity, the fluorescent component generates fluorescence under the excitation action of the first laser and reflects the fluorescence to the first light guide part, and the first light guide part reflects the fluorescence to the light outlet.

2. The laser light source of claim 1, wherein the light guide cavity has a reflective film on an inner wall thereof, and the reflective film is capable of reflecting at least a part of the first laser light toward the fluorescent member and reflecting at least a part of the fluorescent light toward the first light guide portion.

3. The laser light source of claim 2, wherein the inner wall of the light guide cavity is a curved surface.

4. The laser light source of claim 3, wherein the arc of the curved surface is parabolic.

5. The laser light source according to claim 1, wherein an orthographic projection of the first light guide portion on a plane where the light inlet is located covers an area where the light inlet is located.

6. The laser light source according to any one of claims 1 to 5, wherein the first light guide portion is a reflector, and the first light guide portion has a light passing hole;

alternatively, the first light guide part is a dichroic mirror.

7. The laser light source according to claim 6, wherein a surface of the first light guide portion facing the second light guide portion is a curved reflection surface.

8. The laser light source according to claim 6, wherein when the first light guide portion is a dichroic mirror, the laser light source further includes: and the second laser emitted by the second laser penetrates through the first light guide part and synchronously emits the fluorescent light to the light outlet.

9. The laser light source of claim 6, further comprising: a converging portion located between the first laser and the first light directing portion.

10. An illumination device, comprising: a laser light source and a light homogenizing assembly, wherein the laser light source is the laser light source of any one of the claims 1 to 9.

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