Laser light source

Abstract

The utility model discloses a laser light source, which comprises a first laser, a second laser, a polarizing film, a collimating lens, a dichroscope, a wavelength conversion device, a reflector and a dodging device, wherein the polarizing film and the dichroscope are respectively provided with a first pivot center and a second pivot center, and the polarizing film can rotate around the first pivot center; the dichroscope can rotate around the center of a second pivot, the first laser can move relative to the polaroid in the extending direction of the polaroid, and the second laser can move relative to the polaroid in the extending direction of the polaroid. The energy density can be dispersed by two or more light spots in the laser light source, so that the problem of conversion efficiency saturation caused by energy density concentration is further solved, the excitation conversion efficiency is excellent, and the thermal efficiency is improved accordingly.

Description

Technical Field

[0001] The utility model relates to the technical field of projection, in particular to a laser light source. Background Art

[0002] The projector uses a laser light source. Its working method is that the solid-state laser emits light, which is irradiated onto the wavelength conversion device (fluorescent wheel) for wavelength conversion (it can also be said that the excitation light of the laser is concentrated and irradiated onto the wavelength conversion device for wavelength conversion, generating stimulated light of different wavelengths), and then irradiates the optical imaging component of the projector after passing through a specific optical path, and then emits the image onto a specific medium for people to watch the image.

[0003] Prior art laser light source: Figure 1 As shown, when the laser (especially when multiple laser spots converge on the same point) emits light that converges on the wavelength conversion device, the laser spot is small and the peak energy density is very high. The more lasers there are, the higher the energy will be. As a result, the light conversion efficiency of the wavelength conversion device becomes low, and most of the excitation wavelength conversion light is lost as heat. At the same time, the light output efficiency of the entire light source becomes low, and the efficiency will become lower and lower over time, and the wavelength conversion material may even change in quality and burn out.

[0004] Therefore, it is necessary to invent a laser light source to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a laser light source to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a laser light source, comprising: a first laser, a second laser, a polarizing plate, a collimating lens, a dichroic mirror, a wavelength conversion device, a reflector and a light homogenizing device, wherein the first laser and the second laser are respectively located on both sides of the polarizing plate; the light emitted from the first laser and the second laser is emitted from the polarizing plate to the dichroic mirror via the collimating lens, and the wavelength conversion device moves the light to the light homogenizing device through the reflector through the dichroic mirror after receiving the light output by the dichroic mirror, the polarizing plate and the dichroic mirror respectively have a first pivot center and a second pivot center, and the polarizing plate can rotate around the first pivot center; the dichroic mirror can rotate around the second pivot center, and the light moves from the polarizing plate, the collimating lens to the dichroic mirror along a first direction, the emission direction of the first laser is perpendicular to the first direction, and the first laser can move relative to the polarizing plate along the first direction; the emission direction of the first laser is parallel to the first direction, and the first laser can move relative to the polarizing plate along a direction perpendicular to the first direction.

[0007] Preferably, the wavelength conversion device comprises a vertical pole and a conversion component, and the conversion component is fixedly installed on the top of the vertical pole, the conversion component comprises a substrate, and the substrate is circular, and a coating layer is arranged around the front edge of the conversion component.

[0008] Preferably, the front side of the coating layer is integrally formed with a plurality of protrusions, and the plurality of protrusions are distributed at equal intervals.

[0009] Preferably, the protrusions are arranged in an inverted "V" shape, and a plurality of protrusions are connected end to end in sequence.

[0010] Preferably, a driving element is installed on the front side of the substrate, and the driving element is located in the middle of the front side of the substrate.

[0011] Preferably, a heat-conducting layer is disposed around the front surface of the substrate, and the heat-conducting layer is located outside the driving element.

[0012] Preferably, a fluorescent layer is disposed around the front surface of the substrate, and the fluorescent layer is located outside the heat-conducting layer.

[0013] Preferably, a conversion zone is arranged around the front side of the substrate, and the conversion zone is located between the fluorescent layer and the coating layer.

[0014] Technical effects and advantages of the utility model:

[0015] The utility model separates the laser convergence spot so that the energy density of the laser converged and irradiated on the wavelength conversion material is weakened, that is, a converged light spot is changed into two or more points to disperse the energy density. At the same time, through the setting of the coating layer, a microstructure is made on the coating, and this microstructure will also weakly disperse the peak energy density of the laser spot, thereby improving the laser wavelength conversion efficiency, protecting the conversion material from damage, and increasing the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the principle structure of the prior art light source of the utility model.

[0017] Figure 2 This is a schematic diagram of the principle structure of the laser light source of the utility model.

[0018] Figure 3 It is a schematic diagram of the overall structure of the wavelength conversion device of the present utility model.

[0019] Figure 4 It is a schematic diagram of the coating layer structure of the utility model.

[0020] Figure 5 It is a schematic diagram of the structure of the protrusions on the coating layer of the utility model.

[0021] In the figure: 100, first laser; 101, second laser; 200, polarizer; 202, collimating lens; 203, dichroic mirror; 204, reflector; 205, light homogenizing device; 206, focusing lens; 207, wavelength conversion device; X, first direction; 301, first pivot center; 302, second pivot center; 1, vertical pole; 2, conversion component; 201, substrate; 202, heat conductive layer; 203, fluorescent layer; 204, conversion zone; 205, driving element; 206, coating layer; 2061, protrusion. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] The utility model provides Figure 2 A laser light source is shown, comprising a first laser 100, a second laser 101, a polarizer 200, a collimating lens 202, a dichroic mirror 203, a wavelength conversion device 207, a reflector 204 and a light homogenizing device 205, wherein the first laser 100 and the second laser 101 are respectively located on both sides of the polarizer; the light emitted from the first laser 100 and the second laser 101 is emitted from the polarizer to the dichroic mirror 203 via the collimating lens 202, and the wavelength conversion device 207, after receiving the light output by the dichroic mirror 203, moves the light to the light homogenizing device 205 through the reflector 204 via the dichroic mirror 203, and the polarizer 200 and the dichroic mirror 2 ... moves the light to the light homogenizing device 205 through the reflector 204 via the dichroic mirror 203, and the polarizer 200 and the dichroic mirror 201 are respectively located on both sides of the polarizer; the light emitted from the first laser The dichroic mirror 203 has a first pivot center 301 and a second pivot center 302 respectively, and the polarizer 200 can rotate around the first pivot center 301; the dichroic mirror 203 can rotate around the second pivot center 302, and light moves from the polarizer 200 and the collimating lens 202 to the dichroic mirror 203 along the first direction X, the emission direction of the first laser 100 is perpendicular to the first direction X, and the first laser 100 can move relative to the polarizer 200 along the first direction X; the emission direction of the first laser 100 is parallel to the first direction X, and the first laser 100 can move relative to the polarizer 200 in a direction perpendicular to the first direction X.

[0024] The first laser 100 and the second laser 101 may be blue lasers. The light moves from the polarizer 200, the collimating lens 202 to the dichroic mirror 203 along the first direction X, and then passes through the dichroic mirror 203, is converted by the wavelength conversion device 207, and then moves to the light homogenizing device 205 through the dichroic mirror 203 and the reflector 204. Preferably, a condenser lens 206 may be provided between the polarizer 200 and the collimating lens 202, between the condenser lens 206 and the dichroic mirror 203, and between the reflector 204 and the light homogenizing device 205.

[0025] Generally, the first pivot center 301 of the polarizer 200 and the second pivot center 302 of the dichroic mirror 203 are respectively arranged at the center positions of the polarizer 200 and the dichroic mirror 203. Of course, in other optional embodiments, the first pivot center 301 of the polarizer 200 and the second pivot center 302 of the dichroic mirror 203 can also be arranged as required, such as eccentric arrangement. The emission direction of the first laser 100 is perpendicular to the first direction X. Moreover, when the emission direction of the first laser 100 is perpendicular to the first direction X, the first laser 100 can be moved along the first direction X relative to the polarizer 200 by a driving device such as a motor, a cylinder, an oil cylinder, a mechanical arm, etc.

[0026] The emission direction of the second laser 101 is parallel to the first direction X. Furthermore, when the emission direction of the second laser 101 is parallel to the first direction X, the second laser 101 can be moved along a second direction relative to the polarizer 200 by a driving device such as a motor, a cylinder, an oil cylinder, or a mechanical arm, wherein the second direction is perpendicular to the first direction X.

[0027] At the same time, the polarizer 200 can be rotated around the first pivot center 301 by means of a motor, an air cylinder, an oil cylinder, a robotic arm, etc.; the dichroic mirror 203 can be rotated around the second pivot center 302 by means of a motor, an air cylinder, an oil cylinder, a robotic arm, etc.

[0028] Since multiple adjustment points are set, the blue laser can be dispersed as needed, especially as needed. The laser light source in this application is characterized by excellent laser excitation conversion efficiency, and the thermal efficiency is also improved. The technical point is that the wavelength conversion device 207 is stimulated to improve the efficiency of light emission. The principle is that when the blue laser is converged and irradiated on the wavelength conversion material, the energy density is weakened. Compared with the original technology, a converged light spot becomes two or more points to disperse the energy density, thereby further solving the conversion efficiency saturation problem caused by the concentration of energy density.

[0029] Combination Figure 2 and Figure 3As shown, the wavelength conversion device 207 includes a vertical pole 1 and a conversion component 2, and the conversion component 2 is fixedly installed on the top of the vertical pole 1. The conversion component 2 includes a substrate 201, and the substrate 201 is arranged in a circular shape. A coating layer 206 is arranged around the front edge of the conversion component 2. The front of the coating layer 206 is integrally formed with a plurality of protrusions 2061, and the plurality of protrusions 2061 are distributed at equal intervals. The protrusions 2061 are arranged in an inverted "V" shape, and the plurality of protrusions 2061 are connected end to end in sequence. By separating the laser convergence spot, the energy density of the laser converged and irradiated on the wavelength conversion material is weakened, that is, a converged light spot is changed into two or more points to disperse the energy density. At the same time, through the setting of the coating layer 206, the protrusions 2061 are formed on the coating layer 206, thereby forming a microstructure. This microstructure will also slightly disperse the peak energy density of the laser spot to reduce the peak energy, thereby improving the laser wavelength conversion efficiency, protecting the conversion material from damage, and increasing the service life.

[0030] Furthermore, the protrusion 2061 requires a special fixture to suppress the special microstructure. The microstructure is not limited in size, shape and area. The aperture size of the light homogenizing device 205 needs to be determined by the imaging system, and the light spot size of the light source matches it. The front of the substrate 201 is equipped with a driving element 205, and the driving element 205 is located in the middle of the front of the substrate 201. The front of the substrate 201 is surrounded by a heat-conducting layer 202, and the heat-conducting layer 202 is located on the outside of the driving element 205. The heat-conducting layer 202 is used to To dissipate the heat generated when the conversion zone 204 is converted, a fluorescent layer 203 is arranged around the front of the substrate 201, and the fluorescent layer 203 is located on the outside of the heat-conducting layer 202. The fluorescent layer 203 is used to receive the excitation light and emit the converted light, receive the light beam emitted by the laser, and emit the corresponding converted light. A conversion zone 204 is arranged around the front of the substrate 201, and the conversion zone 204 is located between the fluorescent layer 203 and the coating layer 206. The conversion zone 204 is used to convert the wavelength of the light beam emitted by the laser.

[0031] Working principle of this utility model:

[0032] When in use, the light rod and the light port need to be able to completely collect light, otherwise the overall brightness will be affected. The polarizer 200 and the dichroic mirror 203 can change their angles, and the laser can change its placement position, so that the laser emits a light beam, which is dispersed through the focusing lens 206, and the original light spot is changed into two or more points to disperse the energy density. After the light beam passes through the collimating lens 202 and the focusing lens 206, it irradiates the wavelength conversion device 207 for wavelength conversion. Through the setting of the coating layer 206, a microstructure is formed in the coating layer 206. This microstructure will also slightly disperse the peak energy density of the laser spot, thereby improving the laser wavelength conversion efficiency, protecting the conversion material from damage, and increasing the service life.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser light source, comprising: A first laser, a second laser, a polarizer, a collimating lens, a dichroic mirror, a wavelength conversion device, a reflector and a light homogenizing device, wherein the first laser and the second laser are respectively located on both sides of the polarizer; the light emitted from the first laser and the second laser is emitted from the polarizer to the dichroic mirror via the collimating lens, and the wavelength conversion device moves the light to the light homogenizing device through the reflector via the dichroic mirror after receiving the light output by the dichroic mirror, characterized in that the polarizer and the dichroic mirror respectively have a first pivot center and a second pivot center, and the polarizer can rotate around the first pivot center; the dichroic mirror can rotate around the second pivot center, and the light moves from the polarizer, the collimating lens to the dichroic mirror along a first direction, the emission direction of the first laser is perpendicular to the first direction, and the first laser can move relative to the polarizer along the first direction; the emission direction of the first laser is parallel to the first direction, and the first laser can move relative to the polarizer along a direction perpendicular to the first direction.

2. A laser light source according to claim 1, characterized in that: The wavelength conversion device comprises a vertical pole and a conversion component, and the conversion component is fixedly installed on the top of the vertical pole. The conversion component comprises a base plate, and the base plate is arranged in a circular shape. A coating layer is arranged around the front edge of the conversion component.

3. A laser light source according to claim 2, characterized in that: The front side of the coating layer is integrally formed with a plurality of protrusions, and the plurality of protrusions are distributed at equal intervals.

4. A laser light source according to claim 3, characterized in that: The protrusions are arranged in an inverted "V" shape, and a plurality of protrusions are connected end to end in sequence.

5. A laser light source according to claim 4, characterized in that: A driving element is installed on the front side of the substrate, and the driving element is located in the middle of the front side of the substrate.

6. A laser light source according to claim 5, characterized in that: A heat-conducting layer is arranged around the front surface of the substrate, and the heat-conducting layer is located outside the driving element.

7. A laser light source according to claim 6, characterized in that: A fluorescent layer is arranged around the front side of the substrate, and the fluorescent layer is located outside the heat-conducting layer.

8. A laser light source according to claim 6, characterized in that: A conversion zone is arranged around the front side of the substrate, and the conversion zone is located between the fluorescent layer and the coating layer.

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