CN119717378A - Light source system and laser projection equipment - Google Patents
Light source system and laser projection equipment Download PDFInfo
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- CN119717378A CN119717378A CN202311274357.4A CN202311274357A CN119717378A CN 119717378 A CN119717378 A CN 119717378A CN 202311274357 A CN202311274357 A CN 202311274357A CN 119717378 A CN119717378 A CN 119717378A
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Abstract
本发明提供一种光源系统及激光投影设备，光源系统包括：至少一个激光器，激光器包括用于发出第一类激光的第一发光单元，以及用于发出第二类激光的第二发光单元，第一类激光和第二类激光具有不同波长；合光组件，合光组件包括第一合光件，第一合光件位于至少一个激光器的出光侧，以使第一类激光和第二类激光中的激光光束经过第一合光件的光程不同，激光器经过第一合光件后的出射光束进行合光；匀光组件，匀光组件用于匀化合光后的激光光束。本发明具有较好的消散斑效果，结构紧凑，匀光效果好。
The present invention provides a light source system and a laser projection device, wherein the light source system comprises: at least one laser, the laser comprises a first light emitting unit for emitting a first type of laser, and a second light emitting unit for emitting a second type of laser, wherein the first type of laser and the second type of laser have different wavelengths; a light combining component, wherein the light combining component comprises a first light combining part, wherein the first light combining part is located at the light output side of at least one laser, so that the optical paths of the laser beams in the first type of laser and the second type of laser passing through the first light combining part are different, and the output beams of the lasers after passing through the first light combining part are combined; and a light homogenizing component, wherein the light homogenizing component is used to homogenize the laser beams after the light is combined. The present invention has a good speckle elimination effect, a compact structure, and a good light homogenizing effect.
Description
Technical Field
The present invention relates to the field of laser projection technology, and in particular, to a light source system and a laser projection device.
Background
With the continuous development of science and technology, projection display systems are increasingly used in people's work and life. Among them, laser projection is gradually occupying the market because of its advantages of wide color gamut, high brightness, long life, etc., and laser projection devices are increasingly applied to people's work and life. Currently, a laser projection device mainly includes a light source system, an optical-mechanical system, and a lens.
Currently, a light source system generally comprises a light combining component, a light homogenizing component and two lasers. The laser can emit green laser light, blue laser light and red laser light at the same time. The light-mixing component can guide the laser emitted by the two lasers to the light-mixing component, and the light-mixing component can homogenize the laser from the light-mixing component and guide the laser to the optical-mechanical system. The optical-mechanical system can modulate the laser emitted from the light homogenizing component, and the laser modulated by the optical-mechanical system can be emitted to the lens and projected through the lens to form a projection picture.
However, due to the arrangement of lasers and other reasons, the two paths of laser spots are too far apart after combining light, so that the light combining effect is not ideal, and the light combining uniformity is poor.
Disclosure of Invention
The invention mainly aims to provide a light source system and laser projection equipment, which have the advantages of better speckle eliminating effect, compact structure and good light homogenizing effect.
To achieve the above object, in a first aspect, the present invention provides a light source system comprising:
At least one laser including a first light emitting unit for emitting a first type of laser light and a second light emitting unit for emitting a second type of laser light, the first type of laser light and the second type of laser light having different wavelengths;
The light combining component comprises a first light combining piece, the first light combining piece is positioned on the light emitting side of at least one laser, so that the optical paths of laser beams in the first type of laser and the second type of laser passing through the first light combining piece are different, and the emergent light beams of the lasers after passing through the first light combining piece are combined;
and the light homogenizing component is used for homogenizing the laser beam after light combination.
The invention has the beneficial effects that through the arrangement, namely, as the first light combining piece can adjust the laser phases emitted from the lasers, the phase difference of the same color light of the lasers is changed after passing through the first light combining piece, so that the polarization states of emitted light beams are different, the mutual interference degree of laser emitted by the two lasers in a subsequent light path in a light source system is lower, the probability of speckles of the laser in the subsequent light path is lower, and the speckle eliminating effect is better, therefore, after the light combining component guides the laser adjusted by the first light combining piece to the light homogenizing component, the laser can be better homogenized through the light homogenizing component, and the better display effect of a projection picture projected by a laser projection device loaded with the light source system can be ensured.
On the basis of the technical scheme, the invention can be improved as follows.
In some optional embodiments, the first light combining member has at least two transmission areas with different coating films, each transmission area transmits one of the first type of laser and the second type of laser respectively, the first light emitting unit of one of the two lasers and the second light emitting unit of the other of the two lasers are emitted from the same transmission area, and the emitted light beams of the two lasers after passing through the first light combining member are combined.
In some alternative embodiments, the first light combining element includes a first transmissive region for transmitting the first type of laser light and reflecting the second type of laser light, and a second transmissive region for transmitting the second type of laser light and reflecting the first type of laser light.
In some optional embodiments, the light combining component further includes a second light combining element, where the first light combining element is located at a light emitting side of at least part of the lasers, so that optical paths of at least part of laser beams in the first type of laser and the second type of laser passing through the first light combining element are different, and the second light combining element is located at a light emitting side of another part of lasers, where the lasers respectively pass through the first light combining element and the second light combining element and then combine the light beams.
In some alternative embodiments, two lasers are arranged in parallel, wherein the first light emitting unit and the second light emitting unit of one laser perform light combination through the first light combining member, and the first light emitting unit and the second light emitting unit of the other laser perform light combination through the two second light combining members respectively.
In some alternative embodiments, the relative positions of the two second light combining members are matched with the positions of different transmission regions of the first light combining member, respectively.
In some optional embodiments, the light combining assembly further includes a light combining prism, where the light combining prism is located on the light emitting side of the first light combining member, and the light combining prism is configured to combine the laser beams passing through the first light combining member.
In some alternative embodiments, the light homogenizing component includes a diffusion sheet, a focusing lens and a light guide, wherein the diffusion sheet is positioned on the light emitting side of the light combining prism to homogenize the laser beam from the light combining prism, and the focusing lens is positioned between the diffusion sheet and the light guide to converge the homogenized laser beam.
In some alternative embodiments, the light emitting directions of the two lasers have an included angle, and the first light combining member is located at the intersection position of the light emitting paths of the two lasers.
In a second aspect, the present invention also provides a laser projection apparatus comprising:
The light source system is the light source system and is used for providing laser beams for the optical machine illumination system;
the optical machine illumination system is used for modulating the laser beam provided by the light source system into an image beam and then emitting the image beam to the imaging system;
The imaging system is used for imaging the image beam and then emitting the imaged image beam to the projection screen.
The invention provides a light source system and laser projection equipment, wherein the laser projection equipment comprises the light source system, the light source system is used for providing laser beams for an optical machine illumination system, the optical machine illumination system is used for modulating the laser beams provided by the light source system into image beams and then emitting the image beams to an imaging system, and the imaging system is used for imaging the image beams and then emitting the image beams to a projection screen. The light source system comprises at least one laser, a light combining component and a light homogenizing component, wherein the laser comprises a first light emitting unit used for emitting first-class laser and a second light emitting unit used for emitting second-class laser, the first-class laser and the second-class laser have different wavelengths, the light combining component comprises a first light combining piece, the first light combining piece is positioned on the light emitting side of the at least one laser, so that the light paths of laser beams in the first-class laser and the second-class laser passing through the first light combining piece are different, the light outgoing beams of the laser passing through the first light combining piece are combined, and the light homogenizing component is used for homogenizing the laser beams after the light combining.
Through the arrangement, namely, since the first light combining piece can adjust the laser phase position emitted from the lasers, the phase difference of the two lasers is changed differently after the same color light passes through the first light combining piece, so that the polarization states of emitted light beams are different, the mutual interference degree of laser emitted by the two lasers in a subsequent light path in a light source system is lower, the probability of speckle occurrence of the laser in the subsequent light path is lower, and a better speckle dissipation effect is achieved, therefore, after the light combining component guides the laser adjusted by the first light combining piece to the light homogenizing component, the laser can be better homogenized through the light homogenizing component, and further, the display effect of a projection picture projected by a laser projection device loaded with the light source system can be guaranteed to be better.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic structural diagram of a first light source system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a laser in a light source system according to an embodiment of the present application;
fig. 3 is an assembly schematic diagram of a laser and a first light combining member in a light source system according to an embodiment of the present application;
Fig. 4 is an assembly schematic diagram of a laser, a first light combining member and a second light combining member in a light source system according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a third light source system according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a fourth light source system according to an embodiment of the present application;
fig. 7 is a light spot diagram before light combination in the light source system according to the embodiment of the present application;
Fig. 8 is a light spot diagram of the light source system after light is combined by the first light combining member according to the embodiment of the present application;
fig. 9 is a light spot diagram of the light source system provided by the embodiment of the application after light is combined by the first light combining member and the light combining prism;
fig. 10 is a schematic structural diagram of a second light source system according to an embodiment of the present application.
Reference numerals illustrate:
100-a light source system;
110-a laser;
111-a first light emitting unit;
112-a second light emitting unit;
113-a first laser;
114-a second laser;
120-a light combining component;
121-a first light combining member;
1211-a first transmissive region;
1212-a second transmission region;
122-a light combining prism;
123-a second light combining member;
130-a dodging component;
131-diffusion sheet;
132-a focusing lens;
133-a light pipe;
134-compound eye.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. All other embodiments obtained fall within the scope of protection of the present invention. The following embodiments and features of the embodiments may be combined with each other without conflict.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements, unless otherwise explicitly specified. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Currently, a light source system generally comprises a light combining component, a light homogenizing component and two lasers. The laser can emit green laser light, blue laser light and red laser light at the same time. The light-mixing component can guide the laser emitted by the two lasers to the light-mixing component, and the light-mixing component can homogenize the laser from the light-mixing component and guide the laser to the optical-mechanical system. The optical-mechanical system can modulate the laser emitted from the light homogenizing component, and the laser modulated by the optical-mechanical system can be emitted to the lens and projected through the lens to form a projection picture. However, due to the arrangement of lasers and other reasons, the two paths of laser spots are too far apart after combining light, so that the light combining effect is not ideal, and the light combining uniformity is poor.
In order to overcome the defects in the prior art, the light source system and the laser projection device provided by the invention have the advantages that through the arrangement, namely, as the first light combining piece can adjust the laser phases emitted from the lasers, the phase difference of the two lasers is changed after the same color light passes through the first light combining piece, so that the polarization states of emitted light beams are different, the mutual interference degree of the lasers emitted by the two lasers in the subsequent light paths in the light source system is lower, the probability of speckles of the lasers in the subsequent light paths is lower, and the speckle dissipation effect is better, so that after the light combining component guides the laser adjusted by the first light combining piece to the light homogenizing component, the lasers can be better homogenized through the light homogenizing component, and the display effect of a projection picture projected by the laser projection device with the light source system can be ensured to be better.
The present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can more clearly understand the present invention.
Fig. 1 is a schematic structural diagram of a first light source system according to an embodiment of the present application, fig. 2 is a schematic structural diagram of a laser in the light source system according to an embodiment of the present application, fig. 3 is an assembly schematic diagram of the laser and a first light combining member in the light source system according to an embodiment of the present application, and fig. 4 is an assembly schematic diagram of the laser and the first light combining member and a second light combining member in the light source system according to an embodiment of the present application.
As shown in fig. 1 to 4, an embodiment of the present application provides a light source system 100 including:
At least one laser 110, the laser 110 comprising a first light emitting unit 111 for emitting a first type of laser light and a second light emitting unit 112 for emitting a second type of laser light, the first type of laser light and the second type of laser light having different wavelengths;
it is understood that the first light emitting units 111 of the first type of laser light may be at least two rows, and the second light emitting units 112 of the second type of laser light may be at least two rows.
Each of the first light emitting units 111 of the first type of laser light may emit red laser light. Some of the second light emitting units 112 of the second type of laser may emit blue laser light, and another part of the second light emitting units may emit green laser light.
It should be noted that at least one of the lasers 110 is a three-color laser 110, wherein the laser 110 may emit red laser light, blue laser light, and green laser light.
The light combining component 120, the light combining component 120 includes a first light combining element 121, the first light combining element 121 is located at the light emitting side of at least one laser 110, so that the optical paths of laser beams in the first type of laser and the second type of laser passing through the first light combining element 121 are different, and the outgoing beams of the laser 110 after passing through the first light combining element 121 are combined;
In addition, in order to achieve the combination of the light rays, the first light combining member 121 made of a birefringent material or a composite material may be used. The material has special optical properties, and can combine different colors of light rays according to a certain proportion.
The first light emitting unit 111 of the first type of laser light of one of the two lasers 110 and the second light emitting unit 112 of the second type of laser light of the other of the two lasers 110 are emitted through the same transmission region of one of the two transmission regions with different coating films.
Accordingly, the second light emitting unit 112 of the second type laser light of one of the two lasers 110 and the first light emitting unit 111 of the first type laser light of the other of the two lasers 110 are both emitted through the same transmission region of the other of the two transmission regions different in coating film.
And the dodging component 130, wherein the dodging component 130 is used for dodging the laser beam after light combination.
It should be noted that, the first light combining member 121 changes the light paths of the first light emitting unit 111 and the second light emitting unit 112 of the two lasers 110, and after combining light, the light spots are adjusted by the light homogenizing component 130, so that the light homogenizing device has a simple and compact structure and a good light homogenizing effect.
Through the above arrangement, that is, since the first light combining member 121 can adjust the laser phase of the light emitted from the laser 110, the phase difference of the light with the same color of the two lasers 110 is changed differently after passing through the first light combining member 121, so that the polarization states of the emitted light beams are different, the degree of mutual interference of the laser emitted by the two lasers 110 in the subsequent light path of the light source system 100 is lower, the probability of speckle occurrence of the laser in the subsequent light path is lower, and the speckle dissipation effect is better, therefore, after the laser after being adjusted by the first light combining member 121 by the light combining member 120 is led to the light homogenizing member 130, the laser can be better homogenized by the light homogenizing member 130, and the display effect of the projection picture projected by the laser projection device loaded with the light source system 100 can be better.
It should be noted that, the first light combining element 121 is made of a birefringent crystal, the thickness of the first light combining element 121 affects the phase of the laser 110, only the first laser 113 is analyzed, the phase of the laser light with three colors is changed by v2 x2 pi/λ (no-ne) H through the device, the phase of the laser light with three colors is changed by 2v 2 x2 pi/λ (no-ne) H through the analysis of the second laser 114, the thickness of the first light combining element 121 can be adjusted to control the fast and slow axis light vector phase difference of the two lasers 110, the phase difference of the light with the same color of the two lasers 110 is changed differently after passing through the first light combining element 121, so that the outgoing light beam has different polarization states, and therefore, the first light combining element 121 has better speckle dissipation effect.
In some alternative embodiments, the first light combining element 121 includes a first transmissive region 1211 and a second transmissive region 1212, the first transmissive region 1211 being configured to transmit the first type of laser light and reflect the second type of laser light, and the second transmissive region 1212 being configured to transmit the second type of laser light and reflect the first type of laser light.
The first transmission region 1211 transmits the red laser beam and reflects the blue laser beam and the green laser beam, and the second transmission region 1212 transmits the blue laser beam and the green laser beam and reflects the red laser beam.
Specifically, the first transmission region 1211 is used for transmitting the red laser light in the first light emitting unit 111 of the first type laser light, reflecting the blue laser light and the green laser light in the first light emitting unit 111 of the second type laser light, and the second transmission region 1212 is used for transmitting the blue laser light and the green laser light in the first light emitting unit 111 of the second type laser light, reflecting the red laser light in the first light emitting unit 111 of the first type laser light.
In some alternative embodiments, the first light combining element 121 has at least two transmission areas with different coating films, each transmission area transmits one of the first type of laser light and the second type of laser light, the first light emitting unit 111 of one of the two lasers 110 and the second light emitting unit 112 of the other of the two lasers 110 are emitted from the same transmission area, and the emitted light beams of the two lasers 110 after passing through the first light combining element 121 are combined;
the first light combining member 121 has two transmission regions with different coating films, and each transmission region transmits the first type of laser light or the second type of laser light.
In some alternative embodiments, the first transmissive region 1211 is located above the second transmissive region 1212;
The first transmissive region 1211 is remote from the first light emitting unit 111 of one of the two lasers 110 and faces the first light emitting unit 111 of the other of the two lasers 110, and the second transmissive region 1212 is remote from the second light emitting unit 112 of one of the two lasers 110 and faces the second light emitting unit 112 of the other of the two lasers 110.
It should be noted that, for convenience of understanding, the two lasers 110 include a first laser 113 and a second laser 114.
Wherein the first transmissive region 1211 is remote from the first light emitting unit 111 of the first laser 113, facing and being close to the first light emitting unit 111 of the second laser 114.
That is, the red laser light in the first light emitting unit 111 transmitting the first type laser light, the first transmission region 1211 reflecting the blue laser light and the green laser light in the first light emitting unit 111 reflecting the second type laser light, the red laser light far from the first laser 113, and the red laser light facing and near the second laser 114.
Still further, the red laser light of the second laser 114 is transmitted to the light homogenizing component 130 by being transmitted through the first transmission region 1211.
It should be noted that the second transmission region 1212 is far from the second light emitting unit 112 of the first laser 113, and faces and is close to the second light emitting unit 112 of the second laser 114.
That is, blue laser light and green laser light in the first light emitting unit 111 transmitting the second type laser light, and the second transmission region 1212 reflecting the red laser light in the first light emitting unit 111 of the first type laser light, the blue laser light and the green laser light far from the first laser 113, the blue laser light and the green laser light facing and near the second laser 114.
Still further, the blue and green lasers of the second laser 114 are transmitted to the light homogenizing module 130 by being transmitted through the second transmission region 1212.
The first transmission region 1211 reflects the blue laser light and the green laser light of the first laser 113, transmits the red laser light of the second laser 114, and the second transmission region 1212 reflects the red laser light of the first laser 113, and transmits the blue laser light and the green laser light of the second laser 114.
Fig. 5 is a schematic structural diagram of a third light source system according to an embodiment of the present application, and fig. 6 is a schematic structural diagram of a fourth light source system according to an embodiment of the present application.
As shown in fig. 4 to fig. 6, in some alternative embodiments, the light combining component 120 further includes a second light combining member 123, referring to fig. 4 specifically, the first light combining member 121 is located at the light emitting side of at least part of the lasers 110, so that at least part of the laser beams of the first type and the second type of lasers have different optical paths through the first light combining member 121, the second light combining member 123 is located at the light emitting side of another part of the lasers 110, and the light beams emitted after the lasers 110 respectively pass through the first light combining member 121 and the second light combining member 123 are combined.
In some alternative embodiments, two lasers 110 are arranged in parallel, where the first light emitting unit 111 and the second light emitting unit 112 of one laser 110 combine light through the first light combining member 121, and the first light emitting unit 111 and the second light emitting unit 112 of the other laser 110 combine light through the two second light combining members 123, respectively.
In the embodiment of the present application, since the number of the lasers 110 is two, there may be various situations of the relative positions of the lasers 110 and the light combining components 120, and there may be various possible implementations of the structure and the number of the light combining components 120. Here, the embodiment of the present application is schematically illustrated:
In a first possible implementation manner, as shown in fig. 5 and fig. 6, when two lasers 110 in the light source system 100 are sequentially arranged along the target direction X and the light emitting sides of the first laser 113 and the second laser 114 face the same side, the number of the light combining components 120 in the light source system 100 is two, and the two light combining components 120 are in one-to-one correspondence with the first laser 113 and the second laser 114, and each light combining component 120 may be located on the light emitting side of the corresponding laser 110.
It should be noted that, for convenience of illustration, the embodiment of the present application is described by taking the case that the two second light combining members 123 may cover the first laser 113 or the second laser 114 as an example.
In contrast, the first laser 113 combines light using the first light combining element 121.
In some embodiments, the light combining assembly 120 may include two second light combining members 123 sequentially arranged along the target direction X, wherein one of the two second light combining members 123 may cover the first light emitting unit 111 in the second laser 114, and the other of the two second light combining members 123 may cover the first light emitting unit 111 in the second laser 114.
In this way, the first light emitting unit 111 in the second laser 114 may emit red laser light to the second light combining member 123, the second light combining member 123 may reflect the red laser light to the light homogenizing component 130, the second light emitting unit 112 in the second laser 114 may emit blue laser light and green laser light to the second light combining member 123, and the second light combining member 123 may reflect the blue laser light and the green laser light to the light homogenizing component 130.
In addition, the blue laser light and the green laser light of the first laser 113 are reflected to the light uniformizing device 130 through the first transmission region 1211, and the red laser light of the first laser 113 is reflected to the light uniformizing device 130 through the second transmission region 1212.
For example, the two second light combining members 123 in the light combining assembly 120 may be the second light combining members 123 for reflecting light of all colors.
In addition, as shown in fig. 5, the first laser 113 is close to the dodging component 130, and the second laser 114 is far from the dodging component 130.
As shown in fig. 6, the second laser 114 is close to the light homogenizing component 130, and the first laser 113 is far from the light homogenizing component 130.
In some alternative embodiments, the relative positions of the two second light combining members 123 are matched with the positions of the different transmission regions of the first light combining member 121, respectively.
It should be noted that, in this way, through the mutual cooperation of the two second light combining members 123, the laser light emitted by the second laser 114 can be simultaneously converged on the light homogenizing component 130, meanwhile, the laser light emitted by the first laser 113 can be simultaneously converged on the light homogenizing component 130 through the first light combining member 121, and the light after light combination can be more uniform in light spot through the adjustment of the light combining prism 122.
Fig. 7 is a light spot diagram before light combination in the light source system provided by the embodiment of the application, fig. 8 is a light spot diagram after light combination by the first light combination element in the light source system provided by the embodiment of the application, and fig. 9 is a light spot diagram after light combination by the first light combination element and the light combination prism in the light source system provided by the embodiment of the application.
As shown in fig. 1 to 9, in some alternative embodiments, the light combining assembly 120 further includes a light combining prism 122, where the light combining prism 122 is located on the light emitting side of the first light combining element 121, and the light combining prism 122 is used to combine the laser beams passing through the first light combining element 121.
It should be noted that, the light beam after light combination is adjusted by the light combining prism 122, so that the light spot can be more uniform. The light combining prism 122 can adjust the direction and intensity of the light according to the requirement to achieve the desired light spot effect.
In general, the two three-color lasers 110, that is, the first laser 113 and the second laser 114 are used for combining light, and the first light combining member 121 and the light combining prism 122 made of birefringent materials or composite materials are combined for adjusting, so that the characteristics of simple and compact structure and good light homogenizing effect can be realized.
As shown in fig. 8 and 9, the light spot pattern after the light is combined by the first light combining member 121 and the light combining prism 122 are exemplified.
It should be noted that, when the second light emitting units 112 of the first laser 113 and the second laser 114 include two light emitting units for emitting blue light in succession and three green light emitting units arranged in succession.
Specifically, the laser light emitted from the second light emitting unit 112 is sequentially distributed in the order of blue-green before being adjusted by the light combining prism 122, and the adjusted laser light may be sequentially distributed in the order of blue-green-blue after being adjusted by the light combining prism 122. In this way, by adjusting the laser light after the light is combined by the light combining prism 122, the problem that the blue laser light and the green laser light emitted by the first laser 113 and the second laser 114 are relatively independent can be effectively avoided.
The second light emitting units 112 of the first and second lasers 113 and 114 include two light emitting units for emitting blue light and three light emitting units for emitting green light, and the first light emitting units 111 of the first and second lasers 113 and 114 include four light emitting units for emitting red light.
In this case, please refer to fig. 9. After the lasers emitted by the first light emitting unit 111 and the second light emitting unit 112 are simultaneously adjusted by the light combining prism 122, and the adjusted lasers are guided to the light homogenizing component 130 by the light combining component 120, the lasers with various colors can be uniformly distributed, and finally the light spots after the lasers are mixed are relatively uniform, so that the quality of the laser beam provided by the light source system 100 can be ensured to be relatively high.
Note that, the light combining unit 120 in the light source system 100 may be used to guide the laser light adjusted by the first light combining element 121 and the light combining prism 122 to the light homogenizing unit 130. Here, since the light combining prism 122 can adjust the laser light emitted from the first laser 113 and the second laser 114, the green laser light and the blue laser light emitted from the first laser 113 and the second laser 114 can be uniformly distributed, and the light of the green laser light and the blue laser light can be mixed before being emitted to the light combining component 120.
Therefore, after the light combining component 120 guides the laser adjusted by the light combining prism 122 to the light homogenizing component 130, the light homogenizing component 130 can better homogenize the laser, so that the homogenizing effect of the light homogenizing component 130 on the laser emitted by the first laser 113 and the second laser 114 is better, and further, the display effect of the projection picture projected by the laser projection device loaded with the light source system 100 can be better.
As shown in fig. 1 to 9, in some alternative embodiments, the light homogenizing module 130 includes a diffusion sheet 131, a focusing lens 132, and a light guide 133, the diffusion sheet 131 is located at the light emitting side of the light combining prism 122 to homogenize the laser beam from the light combining prism 122, and the focusing lens 132 is located between the diffusion sheet 131 and the light guide 133 to converge the homogenized laser beam.
It should be noted that, the diffusion sheet 131 is closer to the light combining component 120 than the focusing lens 132 and the light guide 133, and the diffusion sheet 131 may perform preliminary homogenization of the laser beam from the light combining component 120 and guide the laser beam after the preliminary homogenization to the focusing lens 132. The focusing lens 132 may be located between the diffusion plate 131 and the light guide 133, where the focusing lens 132 may collect the laser beam after preliminary homogenization of the diffusion plate 131, and guide the collected laser beam to the light guide 133 in the light homogenizing component 130, and the laser beam after further homogenization of the light guide 133 is finally homogenized, so that the homogenization effect of the laser beam is better.
Fig. 10 is a schematic structural diagram of a second light source system according to an embodiment of the present application, and as shown in fig. 10, it should be noted that the scheme may also be applied to a compound eye 134 illumination system, where the compound eye 134 is used to perform light homogenization instead of the light pipe 133, and then the light is incident into an optical machine illumination system.
Note that, when the dodging component 130 includes the fly-eye 134 lens, the laser beam emitted from the light combining component 120 may be directly emitted to the fly-eye 134 lens. The fly's eye 134 lens homogenizes the laser beam emitted from each laser unit.
As shown in fig. 1 to 10, in some alternative embodiments, the light emitting directions of the two lasers 110 have an included angle, and the first light combining element 121 is located at a position where the light paths of the two lasers 110 intersect.
In some embodiments, the first laser 113 and the second laser 114 are L-shaped.
It should be noted that, the light mixing of multiple colors can be achieved by combining the light by the two three-color first lasers 113 and the second laser 114. The arrangement is in an L-shaped distribution structure, so that the light combining device is more compact, and the light combining device is suitable for occasions with limited space.
In addition, the L-shaped arrangement can maximally utilize space and reduce the interval between devices. By placing the input and output ports of the optical combiner 120 on both sides of the L-shape, the transmission path of the optical signal inside the optical combiner 120 can be made shorter, and the loss of the optical signal can be reduced. In addition, the L-shaped arrangement can also be conveniently connected with the light combining devices in the plurality of light combining components 120 to form a more complex light path network. Therefore, the arrangement in the L-shape can make the light source system 100 more compact and efficient while maintaining optical performance.
The light source system provided by the embodiment of the application comprises at least one laser, a light combining component and a light homogenizing component, wherein the laser comprises a first light emitting unit used for emitting first-class laser and a second light emitting unit used for emitting second-class laser, the first-class laser and the second-class laser have different wavelengths, the light combining component comprises a first light combining piece, the first light combining piece is positioned at the light emitting sides of the two lasers, so that the light paths of laser beams in the first-class laser and the second-class laser passing through the first light combining piece are different, the light beams emitted by the lasers after passing through the first light combining piece are combined, and the light homogenizing component is used for homogenizing the laser beams after combining the light.
Through the arrangement, namely, since the first light combining piece can adjust the laser phase position emitted from the lasers, the phase difference of the two lasers is changed differently after the same color light passes through the first light combining piece, so that the polarization states of emitted light beams are different, the mutual interference degree of laser emitted by the two lasers in a subsequent light path in a light source system is lower, the probability of speckle occurrence of the laser in the subsequent light path is lower, and a better speckle dissipation effect is achieved, therefore, after the light combining component guides the laser adjusted by the first light combining piece to the light homogenizing component, the laser can be better homogenized through the light homogenizing component, and further, the display effect of a projection picture projected by a laser projection device loaded with the light source system can be guaranteed to be better.
In addition, as shown in fig. 1 to 10, an embodiment of the present application further provides a light source system 100, including:
Two lasers 110, each of the two lasers 110 including different light emitting units to emit first-type laser light and second-type laser light having different wavelengths, respectively;
The light homogenizing component 130, the light homogenizing component 130 is used for homogenizing the laser beam after light combination;
The light combining component 120 is configured to combine the laser beams emitted by the two lasers 110, where the light combining component 120 includes a first light combining element 121, and the first light combining element 121 is located at a light emitting side of the two lasers 110, and is configured to reflect a first type of laser light of one of the two lasers 110, transmit the first type of laser light of the other, reflect a second type of laser light of one of the two lasers 110, and transmit the second type of laser light of the other.
In some alternative embodiments, the first light combining element 121 includes a first transmissive region 1211 and a second transmissive region 1212, the first transmissive region 1211 being configured to transmit the first type of laser light and reflect the second type of laser light, and the second transmissive region 1212 being configured to transmit the second type of laser light and reflect the first type of laser light.
In some alternative embodiments, the first transmissive region 1211 is located above the second transmissive region 1212;
The first transmissive region 1211 is remote from the first light emitting unit 111 of one of the two lasers 110 and faces the first light emitting unit 111 of the other of the two lasers 110, and the second transmissive region 1212 is remote from the second light emitting unit 112 of one of the two lasers 110 and faces the second light emitting unit 112 of the other of the two lasers 110.
In some alternative embodiments, the light combining assembly 120 further includes a light combining prism 122, where the light combining prism 122 is located on the light emitting side of the first light combining member 121, and the light combining prism 122 is used for combining the laser beams passing through the first light combining member 121.
It should be noted that, the light beam after light combination is adjusted by the light combining prism 122, so that the light spot can be more uniform. The light combining prism 122 can adjust the direction and intensity of the light according to the requirement to achieve the desired light spot effect.
In some alternative embodiments, the light homogenizing component 130 includes a diffusion sheet 131, a focusing lens 132, and a light guide 133, where the diffusion sheet 131 is located on the light emitting side of the light combining prism 122 to homogenize the laser beam from the light combining prism 122, and the focusing lens 132 is located between the diffusion sheet 131 and the light guide 133 to converge the homogenized laser beam.
In some alternative embodiments, the light emitting directions of the two lasers 110 have an included angle, and the first light combining element 121 is located at the intersection position of the light emitting paths of the two lasers 110.
In some alternative embodiments, two second light combining members 123 are included;
The two lasers 110 are arranged in parallel, wherein the first light emitting unit 111 and the second light emitting unit 112 of one laser 110 are used for light combination through the first light combining member 121, and the first light emitting unit 111 and the second light emitting unit 112 of the other laser 110 are used for light combination through the two second light combining members 123.
In some alternative embodiments, the relative positions of the two second light combining members 123 are matched with the positions of the different transmission regions of the first light combining member 121, respectively.
It should be noted that, in this way, through the mutual cooperation of the two second light combining members 123, the laser light emitted by the second laser 114 can be simultaneously converged on the light homogenizing component 130, meanwhile, the laser light emitted by the first laser 113 can be simultaneously converged on the light homogenizing component 130 through the first light combining member 121, and the light after light combination can be more uniform in light spot through the adjustment of the light combining prism 122.
The light source system comprises two lasers, a light homogenizing component and a light combining component, wherein the two lasers comprise different light emitting units for respectively emitting first-type lasers and second-type lasers with different wavelengths, the light homogenizing component is used for homogenizing laser beams after light combination, the light combining component is used for combining the laser beams emitted by the two lasers, the light combining component comprises a first light combining piece, the first light combining piece is positioned at the light emitting side of the two lasers and used for reflecting first-type lasers of one of the two lasers and transmitting the first-type lasers of the other one of the two lasers and reflecting second-type lasers of one of the two lasers and transmitting the second-type lasers of the other one of the two lasers. Because the first light combining piece can adjust the laser phase position emitted from the lasers, the phase difference of the two lasers is changed differently after the same color light passes through the first light combining piece, so that the polarization states of emitted light beams are different, the mutual interference degree of the lasers emitted by the two lasers in a subsequent light path in a light source system is lower, the probability of speckles of the lasers in the subsequent light path is lower, and a better speckle dissipation effect is achieved.
In addition, an embodiment of the present application further provides a laser projection apparatus, including:
the light source system 100, the light source system 100 is the light source system 100 described above, and the light source system 100 is configured to provide a laser beam to an optical machine illumination system;
the optical machine illumination system is used for modulating the laser beam provided by the light source system 100 into an image beam and then emitting the image beam to the imaging system;
The imaging system is used for imaging the image beam and then emitting the imaged image beam to the projection screen.
The specific structure, operation principle and function of the light source system 100 are described in detail in the first embodiment, and are not repeated here.
The laser projection device provided by the embodiment of the application comprises a light source system, a bare engine illumination system and an imaging system, wherein the light source system is the light source system, the light source system is used for providing laser beams for the bare engine illumination system, the bare engine illumination system is used for modulating the laser beams provided by the light source system into image beams and then emitting the image beams to the imaging system, and the imaging system is used for imaging the image beams and then emitting the imaged image beams to a projection screen.
Through the arrangement, namely, since the first light combining piece can adjust the laser phase position emitted from the lasers, the phase difference of the two lasers is changed differently after the same color light passes through the first light combining piece, so that the polarization states of emitted light beams are different, the mutual interference degree of laser emitted by the two lasers in a subsequent light path in a light source system is lower, the probability of speckle occurrence of the laser in the subsequent light path is lower, and a better speckle dissipation effect is achieved, therefore, after the light combining component guides the laser adjusted by the first light combining piece to the light homogenizing component, the laser can be better homogenized through the light homogenizing component, and further, the display effect of a projection picture projected by a laser projection device loaded with the light source system can be guaranteed to be better.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
It should be noted that the above embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.
Claims (10)
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