CN111552144A

CN111552144A - Laser light source and lighting apparatus

Info

Publication number: CN111552144A
Application number: CN202010607153.8A
Authority: CN
Inventors: 高文宏; 刘灵芝
Original assignee: Beijing Litronics Optoelectronics Technology Co ltd
Current assignee: Beijing Litronics Optoelectronics Technology Co ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2020-08-18

Abstract

The invention discloses a laser light source and lighting equipment, the laser light source includes: the fluorescent body and the laser are arranged on the surface of the same radiator; the laser has a back surface and a front surface which are opposite, the back surface of the laser is attached to the surface of the radiator so as to radiate heat through the radiator, and the front surface of the laser is used for emitting laser; the fluorescent body is provided with a back surface and a front surface which are opposite, the back surface of the fluorescent body is attached to the surface of the radiator so as to radiate heat through the radiator, and the front surface of the fluorescent body is used for emitting fluorescence; the front surface of the laser is provided with a light guide element, and the light guide element is used for enabling laser emitted by the laser to be incident on the front surface of the fluorescent body so as to excite the fluorescent body to emit fluorescence or scatter incident light. By applying the technical scheme provided by the invention, the system volume is reduced, and the heat dissipation efficiency is improved.

Description

Laser light source and lighting apparatus

Technical Field

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

Background

The laser has the characteristics of high brightness, small wavelength width, small optical expansion and the like, and has wide application prospect in the laser display field and the laser illumination field.

In recent years, laser light sources have been widely used in the fields of projection, searchlighting, and the like, and as a new generation of light source, there is a trend of gradually replacing LEDs and bulbs in various fields.

The laser light source needs to excite the phosphor by blue laser light to emit laser light of a desired color. The laser and the fluorophor can generate heat during working, in order to ensure normal and reliable operation of the laser light source and the fluorescent material, a radiator is required to be arranged for the laser light source, and then the fluorescent wheel is rotated at a high speed, so that the laser light source system has a complex structure, a large volume and low heat dissipation efficiency.

Disclosure of Invention

In view of this, the invention provides a laser light source and a lighting device, which have simple system structure, reduced system volume and improved heat dissipation efficiency.

In order to achieve the above purpose, the invention provides the following technical scheme:

a laser light source comprising:

the fluorescent body and the laser are arranged on the surface of the same radiator;

the laser has a back surface and a front surface which are opposite, the back surface of the laser is attached to the surface of the radiator so as to radiate heat through the radiator, and the front surface of the laser is used for emitting laser;

the fluorescent body is provided with a back surface and a front surface which are opposite, the back surface of the fluorescent body is attached to the surface of the radiator so as to radiate heat through the radiator, and the front surface of the fluorescent body is used for emitting fluorescence;

the front surface of the laser is provided with a light guide element, and the light guide element is used for enabling laser emitted by the laser to be incident on the front surface of the fluorescent body so as to excite the fluorescent body to emit fluorescence or scatter incident light.

Preferably, in the above laser light source, the laser light source includes a plurality of the lasers, and the lasers are disposed around the fluorescent material.

Preferably, in the above laser light source, the lasers are located on the same circumference.

Preferably, in the above laser light source, the laser light source includes a plurality of the lasers emitting blue laser light.

Preferably, in the above laser light source, the laser light source includes at least one laser for emitting blue laser light, a part of the blue laser light is used to excite the fluorescent body to emit yellow fluorescent light, and another part of the blue laser light is scattered and then mixed with the red fluorescent light to emit white light.

Preferably, in the above laser light source, the front surface of the phosphor has a window region having an antireflection film for increasing transmittance of blue light and yellow light.

Preferably, in the above laser light source, the light guide element is a mirror or a light rod.

Preferably, in the above laser light source, the phosphor is a ceramic phosphor, a crystal phosphor, a phosphor of a phosphor powder mixed with an inorganic paste, or a fluorescent glass.

Preferably, the laser light source includes at least one of the following modes:

the back of the laser is provided with a positive pin and a negative pin, and the radiator is provided with a pin accommodating hole at the position corresponding to the positive pin and the negative pin;

a lens group is arranged above the front side of the fluorophor and is used for collecting excited fluorescence or scattered laser;

the fluorophor and the laser are fixedly attached to the radiator through heat conducting glue.

The invention also provides an illumination device comprising the laser light source.

As can be seen from the above description, in the laser light source and the lighting apparatus provided by the technical scheme of the present invention, the phosphor and the laser are disposed on the same heat sink, so that the phosphor and the laser radiate heat through the same heat sink, the system structure is simple, the volume of the apparatus is greatly reduced, and the heat radiation efficiency is improved.

Furthermore, the laser light source can be provided with a plurality of lasers, the lasers are uniformly arranged around the fluorescent body, so that the light emitting brightness of the laser light source is improved, and meanwhile, parallel light emitting is formed by additionally arranging a lens group, so that long-distance illumination is realized, and the problems of limited laser irradiation distance, serious attenuation, large emission angle, light dispersion, insufficient brightness and poor color rendering property in the prior art are solved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention.

FIG. 1 is a schematic structural diagram of a conventional laser light source;

fig. 2 is a front view of a laser light source according to an embodiment of the present invention;

fig. 3 is a top view of a laser light source according to an embodiment of the invention;

FIG. 4 is a cross-sectional view of a blue light-excited fluorescence mode provided by an embodiment of the present invention;

FIG. 5 is a cross-sectional view of another embodiment of the present invention showing a blue light fluorescence excitation mode;

FIG. 6 is a cross-sectional view of another embodiment of the blue-excited fluorescence method provided in the present invention;

fig. 7 is a front view of another laser light source according to an embodiment of the present invention.

Detailed Description

The embodiments of the present application will be described in detail and fully with reference to the accompanying drawings, wherein the description is only for the purpose of illustrating the embodiments of the present application and is not intended to limit the scope of the invention. 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 application.

The divergence angle of the laser is small, the power is high, and the high brightness can be realized at a longer distance. In particular, the lamp can be widely applied to the fields of automobile lamps, beacon indicators, mine headlamps, portable lighting and the like.

In recent years, laser light sources have been widely used in the fields of projection, searchlighting, and the like, and as a new generation of light source, there is a trend of gradually replacing LEDs and bulbs in various fields. The LED light source in the current market has limited irradiation distance, the brightness is extremely serious along with the increase of the irradiation distance, the divergence angle is large, the long-distance irradiation area becomes extremely large, the light is dispersed, the brightness is insufficient, and the color rendering property is poor.

In addition, the laser and the phosphor generate heat during operation, in order to ensure normal and reliable operation of the laser light source, a heat sink needs to be arranged for the laser light source and the phosphor, the conventional scheme is as shown in fig. 1, fig. 1 is a schematic structural diagram of the existing laser light source, generally, a heat sink 01 is arranged below the laser 02, the phosphor 03 is arranged above the laser 02, heat is dissipated to the laser 02 through the heat sink 01, the laser emitted upwards by the laser 02 can excite the phosphor 03 upwards to emit fluorescence, the fluorescence and the laser are coupled to form laser, and the phosphor 03 emits laser with a final required color. In order to improve the heat dissipation of the phosphor 03, a heat sink needs to be separately provided for the phosphor 03, which results in a complicated system structure and a high manufacturing cost.

Therefore, in order to solve the above problems, the present invention provides a laser light source and an illumination apparatus, the laser light source including:

Furthermore, the laser light source can be provided with a plurality of lasers, the lasers are uniformly arranged around the fluorescent body, so that the light emitting brightness of the laser light source is improved, meanwhile, the excited fluorescent light and the excited scattered light are collimated by adding the lens group, the remote illumination is realized, and the problems of limited laser irradiation distance, serious attenuation, large emission angle, light dispersion, insufficient brightness and poor color rendering property in the prior art are solved.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.

Referring to fig. 2 and 3, fig. 2 is a front view of a laser light source according to an embodiment of the present invention, and fig. 3 is a top view of the laser light source according to the embodiment of the present invention.

As shown in fig. 2 and 3, the laser light source includes:

phosphor 12 and laser 13 provided on the surface of the same heat sink 11; the laser 13 has opposite back and front surfaces, the back surface of the laser is attached to the surface of the heat sink 11 to dissipate heat through the heat sink 11, and the front surface of the laser is used for emitting laser; the phosphor 12 has a back surface and a front surface opposite to each other, the back surface thereof is attached to the surface of the heat sink 11 to dissipate heat through the heat sink 11, and the front surface thereof is used for emitting fluorescence; wherein, the front surface of the laser 13 is provided with a light guide element 14, and the light guide element 14 is used for making the laser light emitted by the laser 13 incident on the front surface of the fluorescent body 12 so as to excite the fluorescent body 12 to emit fluorescence or scatter the incident light.

In the embodiment of the invention, the fluorescent body 12 and the laser 13 are arranged on the same radiator 11, so that the fluorescent body 12 and the laser 13 are radiated by the same radiator 11, the size of the equipment is greatly reduced, the radiator of the laser 13 can be directly reused to radiate the fluorescent body 12, the manufacturing cost is reduced, and the radiating efficiency is improved.

The laser light source has a plurality of lasers 13, the lasers 13 are disposed around the fluorescent body 12, and the plurality of lasers 13 may be uniformly disposed around the fluorescent body 12. The number of lasers 13 can be increased according to actual requirements to excite higher brightness. Like this, this application laser light source can be through the quantity of adjusting laser 13, adjusts the luminance of final outgoing laser, and it is weak to have solved current laser light source luminance, and the irradiation distance is limited problem.

Further, the lasers 13 are located on the same circumference. The laser light source has a plurality of the lasers 13 emitting blue laser light, and the power of one of the lasers 13 is 4.7W. If 13 blue lasers 13 are provided, when 13 lasers 13 emit blue laser light simultaneously, the power of 13 × 4.7 — 61.1W, and the phosphor 12 can be excited to emit yellow fluorescence of about 15000 lm.

It should be noted that the number of the lasers 13 may be set according to a requirement, and when a plurality of lasers 13 are provided, the lasers are not limited to blue lasers, and a laser that emits red laser light and/or a laser that emits green laser light may be provided. The blue laser excites the phosphor to emit yellow fluorescence, and the red laser and the green laser are used for adjusting the color gamut of the emitted white light and increasing the color rendering property.

In the embodiment of the present invention, the laser light source at least has one laser 13 emitting blue laser, a part of the blue laser is used to excite the fluorescent body 12 to emit yellow fluorescent light, and another part of the blue laser is scattered and then mixed with the yellow fluorescent light to emit white light.

Specifically, the laser light source provided by the present invention at least has a blue laser emitted from a blue laser and enters the fluorescent body 12 through the light guide element 14, wherein a part of the blue laser excites the fluorescent body 12 to emit yellow fluorescence, another part of the blue laser passes through the fluorescent body 12 to transmit the blue laser, the transmitted blue laser and the yellow fluorescence are mixed to emit white light, and the white light is emitted through the lens group 15, so as to realize remote illumination.

Further, the front surface of the phosphor 12 has a window region having an antireflection film for increasing the transmittance of blue laser and yellow fluorescent light, so that the brightness of laser light emitted from the laser light source can be improved, and the utilization rate of the light source can be improved.

In addition, the bottom surface of the window area is further plated with a blue light highly-reflecting film, and the blue light highly-reflecting film is used for reflecting incident blue laser so that the blue laser downwards propagating in the fluorescent body 12 upwards propagates, on one hand, the utilization rate of the fluorescent light emitted by the fluorescent body 12 excited by the blue laser is improved, and on the other hand, the transmissivity of the blue laser through the window area is improved.

In this way, after the blue laser beam passes through the fluorescent body 12, the excited yellow fluorescent light can be directly emitted from the upper surface, and the other part of the blue laser beam is scattered by the surface of the fluorescent body 12 to emit the blue laser beam, so that the blue laser beam and the yellow fluorescent light are coupled to emit a white laser beam.

In an embodiment of the present invention, the light guiding element 14 may be a reflector or a light bar.

It should be noted that, if the light guide element 14 is an optical rod, the transmission path of the laser light in the optical rod can be controlled by using the principle of total reflection of light.

As shown in fig. 4, when the light guide element 14 is a light rod, the size, angle or number of the light rods can be changed so that the blue laser light emitted from the laser 13 enters the fluorescent body 12, and the fluorescent body 12 can be excited by the blue laser light to generate yellow fluorescence.

Referring to fig. 4, fig. 4 is a cross-sectional view of a blue light fluorescence excitation mode according to an embodiment of the present invention, in which the light guide element 14 is a light rod and all the lasers 13 share one light rod in the mode shown in fig. 4. Laser emitted by the laser 13 enters through the bottom surface of the light bar, is reflected by the side surface of the light bar, is reflected for multiple times in the light bar, then exits downwards at the middle part of the bottom surface of the light bar, enters the fluorescent body 12, and excites the fluorescent body 12 to emit fluorescence, and the fluorescence emitted by the fluorescent body 12 and a part of the laser reflected by the fluorescent body are coupled into laser with required color, and then exits upwards through the lens group.

In the mode shown in fig. 4, the light bar has a top surface length of L2, a bottom surface length of L1, and L1 greater than L2, so that the side surfaces of the light bar can reflect laser light toward the middle. The center of laser 13 is at a distance L3 from the center of phosphor 12. The plurality of lasers 13 surround a circle, and the two lasers 13 on the same diameter have a center distance L4. The parameters of L1, L2, L3, L4 may be set as follows:

L1＝52.31mm

L2＝46.6mm

L3＝24.72mm

L4＝58.44mm

it should be noted that the parameters of L1, L2, L3 and L4 may be set based on requirements, and are not limited to the values described in the embodiment of fig. 4.

In the above embodiment, the light guide element 14 is taken as an example of a light rod. In other ways, the light guide element 14 may also be a mirror, as shown in fig. 5 and 6.

Referring to fig. 5, fig. 5 is a cross-sectional view of another blue-excited fluorescence mode provided by the embodiment of the invention, in which the light guide element 14 is a ring-shaped mirror and all the lasers 13 share one ring-shaped mirror in the mode shown in fig. 5. Laser light emitted by the laser 13 enters through the bottom surface of the ring-shaped reflector, is reflected by the ring-shaped reflector, is reflected for 5 times in the light bar, then exits from the side surface of the ring-shaped reflector, enters the fluorescent body 12, and excites the fluorescent body 12 to emit fluorescence, and the fluorescence emitted by the fluorescent body 12 and a part of laser light reflected by the fluorescent body are coupled into laser light with a required color and are emitted upwards through the lens group.

In the mode shown in fig. 5, the top surface outer circumference diameter of the ring-shaped mirror is L6, the bottom surface outer circumference diameter is L5, and L5 is larger than L6, so that the side surface of the ring-shaped mirror can reflect the laser light toward the phosphor 12. The center of laser 13 is at a distance L7 from the center of phosphor 12. The plurality of lasers 13 surround a circle, and the two lasers 13 on the same diameter have a center distance L8. The parameters of L5, L6, L7, L8 may be set as follows:

L5＝52.31mm

L6＝46.6mm

L7＝24.72mm

L8＝58.44mm

it should be noted that the parameters of L5, L6, L7 and L8 may be set based on requirements, and are not limited to the values described in the embodiment of fig. 5.

Referring to fig. 6, fig. 6 is a cross-sectional view of another blue-excited fluorescence mode provided by an embodiment of the invention, and in the mode shown in fig. 6, the light guide element 14 is a ring-shaped reflector. Laser emitted by the laser 13 enters through the bottom surface of the ring-shaped reflector, is reflected by the ring-shaped reflector, is emitted from the side surface of the ring-shaped reflector after being reflected for 3 times in the ring-shaped reflector, and enters the fluorescent body 12, so that the fluorescent body 12 is excited to emit fluorescence, and the fluorescence emitted by the fluorescent body 12 and a part of laser reflected by the fluorescence are coupled into laser with a required color and are emitted upwards through the lens group.

In the embodiment shown in fig. 6, the distance from the light source incident position to the inner diameter of the upper surface of the ring mirror is L10, and the distance from the center of the laser 13 to the center of the fluorescent body 12 is L11. The plurality of lasers 13 enclose a circle, and the distance between the edge positions of two lasers 13 on the same diameter is L9. The parameters of L9, L10, L11 may be set as follows:

L9＝43.71mm

L10＝11.93mm

L11＝17.35mm

it should be noted that the parameters L9, L10, and L11 may be set based on the requirements, and are not limited to the values described in the embodiment of fig. 6.

Or the light bar is replaced by a reflector with different parameters, and the blue laser can excite the yellow fluorescence by changing the size, the angle or the number of the reflectors, so that the yellow fluorescence with about 15000lm can be excited at most.

In the embodiment of the present invention, the phosphor 12 may be a ceramic phosphor, a crystal phosphor, a phosphor 12 formed by mixing inorganic glue with phosphor powder, or fluorescent glass.

In the embodiment of the present invention, the back surface of the laser 13 has a positive pin 131 and a negative pin 132, and the heat sink 11 has pin receiving holes at positions corresponding to the positive pin 131 and the negative pin 132.

In the embodiment of the present invention, a lens group 15 is disposed above the front surface of the fluorescent body 12, and is used for collecting the excited fluorescence or the scattered laser and enabling the laser light source to emit parallel light. It should be noted that the number of lenses in the lens group 15 can be increased according to actual needs, and is not limited herein.

Specifically, blue laser light emitted by the blue laser enters the fluorescent body 12 through the light guide element 14, wherein a part of the blue laser light excites the fluorescent body 12 to emit yellow fluorescent light, the other part of the blue laser light is scattered by the fluorescent body 12, the blue laser light and the yellow fluorescent light are mixed to emit white light, and the white light are formed into parallel light through the lens group 15, so that long-distance illumination is realized.

In the embodiment of the invention, the fluorescent body 12 and the laser 13 are fixedly attached to the radiator 11 through the heat conducting glue, and the fluorescent body and the laser radiate heat through the same radiator, so that the volume of the equipment is greatly reduced.

Referring to fig. 7, fig. 7 is a front view of another laser light source according to an embodiment of the present invention, which is different from the method shown in fig. 1 in that the light guide element 14 is a reflector, and other structures are the same as the method shown in fig. 1, and the working principle is the same, and are not repeated herein.

In the mode shown in fig. 7, if a plurality of lasers 13 are provided, a mirror may be provided individually for each laser, or a ring mirror may be provided in common for all the lasers 13.

As can be seen from the above description, in the laser light source provided by the technical scheme of the present invention, the phosphor and the laser are disposed on the same heat sink, so that the phosphor and the laser radiate heat through the same heat sink, the system structure is simple, the volume of the device is greatly reduced, and the heat radiation efficiency is improved.

Based on the above embodiment, another embodiment of the present invention further provides an illumination apparatus, which includes the laser light source described in the above embodiment.

The lighting equipment can be lighting equipment such as automobile lamps, beacon indicating equipment, mine headlamps, portable projection equipment, head-up display equipment, portable searchlighting equipment and the like. The lighting equipment adopts the laser light source in the embodiment, so that the size of the equipment is reduced, and meanwhile, the long-distance lighting is realized.

The embodiments in the present description are described in a progressive manner, or in a parallel manner, or in a combination of a progressive manner and a parallel manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. For the lighting device disclosed in the embodiment, since it corresponds to the laser light source disclosed in the embodiment, the description is relatively simple, and the relevant points can be referred to the laser light source part for description.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A laser light source, comprising:

2. The laser light source of claim 1, wherein the laser light source has a plurality of the lasers, the lasers being disposed around the phosphor.

3. The laser light source of claim 2, wherein the lasers are located on the same circumference.

4. The laser light source according to claim 2, wherein the laser light source has a plurality of the lasers emitting blue laser light.

5. The laser light source of claim 1, wherein the laser light source comprises at least one laser for emitting blue laser light, a part of the blue laser light is used for exciting the fluorescent body to emit yellow fluorescence, and another part of the blue laser light is scattered and then mixed with the yellow fluorescence to emit white light.

6. The laser light source according to claim 5, wherein the front surface of the phosphor has a window region having an antireflection film for increasing transmittance of blue laser light and yellow fluorescent light.

7. The laser light source of claim 1, wherein the light guide element is a mirror or a light bar.

8. The laser light source according to claim 1, wherein the phosphor is a ceramic phosphor, a crystalline phosphor, a phosphor composed of inorganic paste mixed phosphor, or a fluorescent glass.

9. The laser light source according to any one of claims 1 to 8, characterized by comprising at least one of the following:

10. An illumination device, characterized in that it comprises a laser light source according to any one of claims 1-9.