CN115480439A - Light source assembly and projection equipment - Google Patents

Abstract

The embodiment of the application provides a light source subassembly, including light emitting device, send red, blue and green exciting light, collimating lens group, the convergent lens group, the reflector, diffuse reflection structure and even light subassembly, through reflector and diffuse reflection structure, the exciting light of light emitting device outgoing is incited to diffuse reflection structure, by diffuse reflection structure diffuse reflection, diffuse reflection beam incides to the reflector, incite to even light subassembly after the convergence of reflector, at this in-process, arouse the light beam by diffuse reflection to the reflector, by the reflector convergence again, the polarization characteristic of exciting light has been weakened or has been eliminated, the color cast or the color spot phenomenon that produce when follow-up formation of image has been improved, and make the compact structure of light source subassembly.

Description

Light source assembly and projection equipment

Technical Field

The embodiment of the application relates to the technical field of projection, in particular to a light source assembly and projection equipment.

Background

With the continuous development of science and technology, projection equipment is more and more applied to the work and the life of people. At present, a projection apparatus mainly includes a light source system, an optical-mechanical system and a lens, the light source system is located at a light incident side of the optical-mechanical system, the lens is located at a light emergent side of the optical-mechanical system, and a light beam emitted from the light source system is emitted to the optical-mechanical system, and is emitted to the lens after being processed by the optical-mechanical system, so that the lens can emit the light beam to a projection screen, thereby displaying a picture on the projection screen. In recent years, with the development of laser devices and the reduction of cost, three-color lasers are becoming the preferred devices for projection light sources.

When three-color lasers are used in a light source system, the respective color lasers are generally arranged in a certain manner. In a commonly used laser chip, laser light emitted by a laser is linearly polarized light, wherein blue laser light and green laser light are generated by using a gallium arsenide light emitting material, and red laser light is generated by using a gallium nitride light emitting material. Because the light-emitting mechanisms of the light-emitting materials are different, in the light-emitting process of the red laser, the blue laser and the green laser, the oscillation directions of the resonant cavities are different, so that the polarization directions of the red laser linearly polarized light, the blue laser linearly polarized light and the green laser linearly polarized light are 90 degrees, the red laser is P light linearly polarized light, and the blue laser and the green laser are S light linearly polarized light.

When the applicant uses three-color laser to perform projection imaging, the phenomena of color cast and color spots appearing on a screen are discovered, and the watching experience of a user is influenced.

The present application provides a light source assembly for solving the above problems.

Disclosure of Invention

The application provides a light source component and projection equipment, can improve the color cast and the color spot phenomenon that appear when the light beam of light source component outgoing follow-up formation of image.

The present application provides a light source assembly comprising: the device comprises a light-emitting device, a collimating lens group, a converging lens group, a reflecting bowl and a diffuse reflection structure;

the light-emitting device is used for emitting red, blue and green exciting lights;

the collimating lens group collimates the exciting light emitted by the light-emitting device and emits light beams to the converging lens group;

the converging lens group is positioned between the collimating lens group and the reflecting bowl and converges incident light beams;

the light reflecting bowl comprises a first area and a second area;

the diffuse reflection structure performs diffuse reflection on the light beams incident to the diffuse reflection structure;

the red, green and blue excitation light beams emitted by the light-emitting device are collimated by the collimating lens group to become parallel light beams and are incident to the converging lens group, the parallel light beams are emitted to the first area of the light-reflecting bowl after being converged by the converging lens group, the parallel light beams pass through the first area and are incident to the diffuse reflection structure to be subjected to diffuse reflection by the diffuse reflection structure, and the light beams subjected to diffuse reflection by the diffuse reflection structure are incident to the light-reflecting bowl and are converged by reflection of the second area.

The diffuse reflection structure is a fixed diffuse reflection structure, or the diffuse reflection structure is a moving diffuse reflection structure.

The light reflecting bowl is a circular light reflecting bowl, and the diffuse reflection structure and the light homogenizing assembly are respectively positioned on two sides of a surface which passes through the focus of the circular light reflecting bowl and is vertical to the focal plane.

When the reflector is a circular reflector, the diffuse reflection structure is positioned in a cylinder, the cylinder takes a circular reflector focus as a center of column, has a radius of R and a height of h, and is high in a vertical focal plane, wherein R =0 to 20% of D, h =0 to 10% of D, and D is the diameter of the circular reflector passing through the focus.

The light source component also comprises a light homogenizing component; when the light reflecting bowl is a circular light reflecting bowl, the central point of a light inlet of the light homogenizing assembly is positioned in the range of a cylinder, the cylinder takes the focus of the circular light reflecting bowl as the center of a column, the radius of the cylinder is R, the height of the cylinder is h, and the cylinder is a vertical focal plane, wherein R =0 to 20% of D, h =0 to 10% of D, and D is the diameter of the circular light reflecting bowl passing through the focus.

When the reflector is the oval reflector, the diffuse reflection structure is located a cylinder within range, the cylinder with oval reflector first focus is the center of cylinder, and the radius is R, and the height is h, and high perpendicular focal plane. Wherein, R =0 to 20% by weight of D1, h =0 to 10% by weight of D1, and D1 is the long diameter of the elliptical reflector.

When the reflector is oval reflector, even light subassembly income plain noodles central point is located a cylinder within range, the cylinder with oval reflector first focus is the center of a cylinder, and the radius is R, and the height is h, and high perpendicular focal plane. Wherein, R =0 to 20% by weight of D1, h =0 to 10% by weight of D1, and D1 is the long diameter of the elliptical reflector.

The first area is transparent glass, or the first area is a hollow area.

The area of the first area is larger than or equal to the area of a light spot of a light beam emitted by the convergent lens group and incident on the surface of the reflecting bowl.

When the light reflecting bowl is an elliptical light reflecting bowl, the light beam emitted by the converging lens group is incident to the elliptical light reflecting bowl in an off-axis manner.

The light source assembly further comprises a reflector group, excitation light beams emitted by the light-emitting device are collimated by the collimating lens group, then are incident to the reflector group in parallel, are reflected by the reflector group, are emitted to the converging lens group, are emitted to the light reflecting bowl after being converged, and are incident to the diffuse reflection structure after passing through the first area, and light beams diffusely reflected by the diffuse reflection structure are reflected by the prime number second area and are incident to the dodging assembly.

The technical scheme provided by the embodiment of the application has the beneficial effects that at least:

in the embodiment of the application, through having set up reflector and diffuse reflection structure, the exciting light of illuminator outgoing incides to diffuse reflection structure, by diffuse reflection structure diffuse reflection, and the diffuse reflection beam incides to reflector, incides to even light subassembly after the convergence of reflector, and at this in-process, exciting light beam is by diffuse reflection structure diffuse reflection to reflector, is converged by reflector again. The diffuse reflection structure is arranged in the light source component, the polarization characteristic of exciting light incident on the diffuse reflection structure is weakened or eliminated, the color cast or color spot phenomenon generated in the subsequent imaging process is improved, light is received by the light beam diffusely reflected by the diffuse reflection structure through the light reflection bowl, and the light source component is enabled to be compact in structure while the polarization characteristic of the light beam emitted by the light source component is weakened or eliminated.

Drawings

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

Fig. 1 is a schematic optical path diagram of a light source architecture provided in the present application;

FIG. 2 is a top view of the reflector of FIG. 1;

FIG. 3 is a schematic view of another dodging assembly provided herein;

FIG. 4 is a schematic optical path diagram of another light source architecture provided in the present application;

FIG. 5 is a top view of the reflector of FIG. 4;

FIG. 6 is a schematic optical path diagram of another light source architecture provided in the present application;

FIG. 7 is a diagram of a light source architecture provided herein;

FIG. 8 is another light source architecture provided herein;

FIG. 9 is a schematic diagram of another embodiment of a light source architecture;

FIG. 10 is a diagram illustrating a positional relationship between a diffuse reflection structure and a light uniformizing element of the light source structure shown in FIG. 1;

fig. 11 is a diagram illustrating a positional relationship between a diffuse reflection structure and a light uniformizing element of the light source structure shown in fig. 4.

Reference numerals:

the light-emitting device 101, the first red laser component 1010, the second red laser component 1011, the blue laser component 1012, the green laser component 1013, the collimating lens group 102, the converging lens group 103, the light reflecting bowl 104, the first region 1041, the second region 1042, the diffuse reflection structure 105, the light guide 106, the circular light reflecting bowl focus 107, the first focus 1071, the second focus 1072, the first reflector 1080, the second reflector 1081, the third reflector 1082, and the fourth reflector 1083.

Detailed Description

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

The present application provides a light source assembly comprising: the device comprises a light-emitting device 101, a collimating lens group 102, a converging lens group 103, a reflecting bowl 104, a diffuse reflection structure 105 and a light homogenizing assembly;

the light emitting device 101 is used for emitting red, blue and green excitation lights;

the collimating lens group 102 collimates the excitation light emitted by the light emitting device 101 and emits a light beam to the converging lens group 103;

the converging lens group 103 is positioned between the collimating lens group 102 and the reflector 104 and converges incident light beams;

the reflector 104 includes a first region 1041 and a second region 1042;

the diffuse reflection structure 105 performs diffuse reflection on the light beam incident to the diffuse reflection structure 105;

the red, green and blue excitation light beams emitted by the light emitting device 101 are collimated by the collimating lens group 102 to become parallel light beams and enter the converging lens group 103, the parallel light beams are converged by the converging lens group 103 and then emit to the first region 1041 of the light reflecting bowl 104, the parallel light beams enter the diffuse reflection structure 105 through the first region 1041 and are diffusely reflected by the diffuse reflection structure 105, and the light beams diffusely reflected by the diffuse reflection structure 105 enter the light reflecting bowl 104 and are reflected by the second region 1042 and then enter the light uniformizing assembly.

In one embodiment, the composition of the light source assembly may be as shown in fig. 1. As shown in fig. 1, the light source assembly includes: a light emitting device 101 for emitting a laser beam; the collimating lens group 102 is positioned on an emergent path of the laser chip, collimates the laser beam emitted by the light-emitting device 101, and emits the collimated laser beam as a parallel beam; the converging lens group 103 is positioned between the collimating lens group 102 and the reflecting bowl 104 and is used for converging the laser beam passing through the collimating lens group 102 to reduce the area of a light spot; a reflector 104, wherein the reflector 104 is provided with a first region 1041, and the light beam transmitted through the converging lens group 103 is incident into the reflector 104 through the first region 1041; a diffuse reflection structure 105 that diffusely reflects the light beam incident to the diffuse reflection structure 105; the light homogenizing assembly, illustratively, the light homogenizing assembly is a light pipe 106, the light beam reflected by the light reflecting bowl 104 is incident on the light pipe 106, and the light pipe 106 homogenizes the light beam.

The light-emitting device 101 includes a laser module capable of emitting red laser light, a laser module capable of emitting blue laser light, and a laser module capable of emitting green laser light. In this embodiment, the light emitting device 101 includes two sets of red laser components, one set of green laser components 1013, and one set of blue laser components 1012, but in one possible embodiment, the light emitting device 101 may include any number of red laser components, green laser components 1013, and blue laser components 1012, and may include three sets of red laser components, two sets of blue laser components 1012, and one set of green laser components 1013, for example, and the number of laser components is not limited in this application.

In the light emitting device 101, the positions of the laser assemblies of each color may be arranged according to a certain rule, and illustratively, the red lasers are all arranged in a row, the green lasers are arranged in a row, and the blue lasers are arranged in a row. In a possible embodiment, if the number of the laser assemblies of each color is different, the arrangement of the laser assemblies of each color can be adjusted according to the requirement. Illustratively, the red lasers are arranged in two rows, the green lasers are arranged in one row, and the blue lasers are arranged in one row; in a possible embodiment, the positions of the lasers of the various colors arranged in the array can be changed according to the needs, and exemplarily, as shown in fig. 1, the laser assembly includes 4 rows, wherein the red lasers are arranged in two rows, the green lasers are arranged in one row, and the blue lasers are arranged in one row, and the 4 rows of laser assemblies are sequentially a red laser assembly, a blue laser assembly 1012, and a green laser assembly 1013.

In a possible embodiment, in the light emitting device 101, the number of the laser assemblies of each color may not be equal, and the position arrangement may not be arranged in a certain order. This is not limited by the present application.

In a possible embodiment, the application does not limit the types and the number of the light emitting devices as long as the light emitting devices emit three-color excitation light beams, as long as the light emitting devices can be solid-state light source arrays or LED light emitting devices.

The collimating lens group 102 is located in the light path emitted from the laser assembly, and includes a plurality of small lenses, and the collimating lens group 102 collimates the excitation beam emitted from the laser, so that the beam becomes a parallel beam and is emitted to the converging lens group 103.

In one possible embodiment, each small lens corresponds to one laser assembly, and the excitation light beam emitted by each laser assembly enters the small lens in the collimating lens group 102 and is collimated by the small lens into a parallel light beam to be emitted, i.e., in this possible embodiment, the number of the small lenses corresponds to the number of the laser assemblies.

In one possible embodiment, the number of lenslets and laser assemblies may not be in a one-to-one correspondence. Illustratively, two laser assemblies correspond to one small lens, and excitation light beams emitted by the two laser assemblies are collimated by the same small lens to become parallel light beams and then are emitted; or the three laser components correspond to one small lens, and the excitation light beams emitted by the three laser components are collimated by the same small lens to become parallel light beams and are emitted; or one laser component corresponds to two or more small lenses, and the excitation light beam emitted by the laser component is collimated by the small lenses to become a parallel light beam and then emitted; or the m laser assemblies correspond to n small lenses (m is not equal to n), and the excitation beams emitted by the m laser assemblies are collimated by the n small lenses to become parallel beams to be emitted. This is not limited by the present application.

The converging lens group 103 is located between the collimating lens group 102 and the reflector 104, and converges the light beam passing through the collimating lens group 102. In one possible embodiment, the converging lens group 103 may include only one converging lens; in one possible embodiment, the converging lens group 103 may include two lenses, which may both be convex lenses; in one possible embodiment, the converging lens group 103 may include three or more lenses. The present application does not limit the number and kinds of lenses included in the converging lens group 103 as long as the effect of converging light beams incident to the converging lens group 103 can be achieved.

In the process, the light beam emitted from the collimating lens group 102 may be symmetrically incident to the converging lens group 103 with the optical axis of the converging lens group 103 as the center, or asymmetrically incident to the converging lens group 103, which is not limited in this application.

The reflector 104 is located on the optical path of the light emitted from the converging lens group 103, in the embodiment shown in fig. 1, the reflector 104 is a circular reflector 104, and a top view of the reflector 104 is shown in fig. 2. The reflector 104 includes a first region 1041 and a second region 1042, the first region 1041 allows the excitation beam passing through the converging lens group 103 to pass through.

In one possible embodiment, the first region 1041 is a transparent region that allows excitation light emitted by the light emitting device 101 to pass through, and the transparent region may be transparent glass; in a possible embodiment, the first region 1041 is a hollow region, the hollow region allows the excitation light emitted by the light emitting device 101 to pass through, and in a possible embodiment, the first region 1041 may be a transparent material plated with a layer that at least transmits red, blue and green laser light. This is not limited by the present application.

In one possible embodiment, the first region 1041 is circular in shape; in one possible embodiment, the shape of the first region 1041 may be an ellipse; in one possible embodiment, the shape of the first region 1041 may be any other regular shape or irregular shape as long as the light beam passing through the converging lens group 103 can pass through the first region 1041, which is not limited in this application.

In one possible embodiment, the size of the first region 1041 may be equal to the area of the light spot passing through the converging lens group 103; the size of the first region 1041 may be larger than the area of the light spot passing through the converging lens group 103; or may be smaller than the area of the light spot passing through the converging lens group 103, which is not limited in this application.

In one possible embodiment, a side of the first region 1041 close to the converging lens group 103 is plated with an antireflection film; in a possible embodiment, a side of the first region 1041 close to the converging lens group 103 and a side of the converging lens group 103 are coated with antireflection films, which is not limited in this application.

In a possible embodiment, the second region 1042 is a reflector or a reflector plate coated with a film layer on a side away from the converging lens group 103, where the film layer is a total reflection film or a reflection film layer capable of at least reflecting the excitation light beam emitted by the light emitting device 101. This is not limited by the present application.

The diffuse reflection structure 105 is located on a side of the light reflection bowl 104 away from the converging lens group 103, and performs diffuse reflection on the excitation light beam incident to the diffuse reflection structure 105.

The diffuse reflection structure 105 may be a matte glass or a structure with a surface coated with a diffuse reflection material, which is not limited in this application as long as the function of diffusely reflecting the excitation light beam incident to the diffuse reflection structure 105 can be achieved.

In a possible embodiment, as shown in fig. 1, the diffuse reflection structure 105 may be a fixed diffuse reflection plate, or may be a moving diffuse reflection structure 105, as shown in fig. 3, the moving diffuse reflection structure 105 includes a movement axis Z, the diffuse reflection structure 105 rotates counterclockwise or clockwise with the movement axis Z as an axis, and the moving diffuse reflection structure 105 may further include other structures, which is not limited in this application as long as the diffuse reflection structure diffusely reflects the excitation light beam incident to the diffuse reflection structure 105.

The light pipe 106 is configured to homogenize the incident light beam, and in one possible embodiment, the light pipe 106 may be a rectangular light pipe 106, and the area of the light inlet is equal to the area of the light outlet; alternatively, as shown in fig. 3, the light guide 106 is wedge-shaped, and the area of the light inlet is smaller than that of the light outlet; in one possible embodiment, the light pipe 106 may have other shapes, which is not limited in this application as long as the incident light beam can be homogenized.

In one possible embodiment, the light pipe 106 may be coated with a high reflective film, and the structure of the light pipe 106 is not limited in this application.

The diffuse reflection structure 105 and the light pipe 106 are respectively located at two sides of the focal point of the circular light reflecting bowl 104, and exemplarily, the position where the excitation light beam is incident on the diffuse reflection structure 105 is the first position, and in one possible embodiment, as shown in fig. 10, the point 107 is the focal point of the circular light reflecting bowl, and the diffuse reflection structure is located within a range of a cylinder, which uses the focal point of the circular light reflecting bowl as the center of cylinder, has a radius of R, a height of h, and a high vertical focal plane. Wherein, R =0 to 20% by weight, h =0 to 10% by weight, D is the diameter of the circular reflector passing through the focal point; the light entrance of the light guide is shown in fig. 10, point 107 is the focus of the circular light-reflecting bowl, the central point of the light entrance of the light guide is located in the range of a cylinder, and the cylinder uses the focus of the circular light-reflecting bowl as the center of the cylinder, has radius R and height h, and is a high vertical focal plane. Wherein R =0 to 20% by weight D, h =0to 10% by weight D, D is the diameter of the circular light-reflecting bowl passing through the focal point; the diffuse reflection structure 105 and the light incident surface of the light guide are respectively located on two sides of a plane passing through the focal point 107 and perpendicular to the focal plane.

Next, the optical path propagation process will be described.

The light emitting device 101 includes a red laser component, a blue laser component 1012, and a green laser component 1013, and emits red, blue, and green three-color excitation light, the excitation light enters the surface of the collimating lens group 102, and passes through the collimating lens group 102 to become a parallel light beam and exit to the converging lens group 103, the converging lens group 103 converges the incident light beam and exits to the circular light reflecting bowl 104, the excitation light beam passes through or directly penetrates through the first region 1041 of the circular light reflecting bowl 104, enters the diffuse reflection structure 105, the light beam reflected by the diffuse reflection structure 105 emits to the surface of the light reflecting bowl 104, and enters the light guide 106 after converging by the light reflecting bowl 104.

In the embodiment, because the diffuse reflection structure 105 and the light reflection bowl 104 are arranged, when the light enters the diffuse reflection structure 105, the excitation light beams with different polarization characteristics are reflected by the diffuse reflection structure 105 to the light reflection bowl 104, and are converged again through the light reflection bowl 104. The diffuse reflection structure is arranged in the light source component, the polarization characteristic of exciting light incident on the diffuse reflection structure is weakened or eliminated, the color cast or color spot phenomenon generated in the subsequent imaging process is improved, light is received by the light beam diffusely reflected by the diffuse reflection structure through the light reflection bowl, and the light source component is enabled to be compact in structure while the polarization characteristic of the light beam emitted by the light source component is weakened or eliminated.

In one embodiment, as shown in fig. 4, a light emitting device 101 is included; a collimating lens group 102; a converging lens group 103; the light reflecting bowl 104, the light reflecting bowl 104 includes a first region 1041 and a second region 1042, the first region 1041 is a projection region, the second region 1042 is a reflection region; a diffuse reflective structure 105 and a light pipe 106. It should be noted that, in the present embodiment, the reflector 104 is an elliptical reflector 104.

In the present embodiment, the elliptical light reflecting bowl 104 has two focal points: a first focal point 1071 and a second focal point 1072.

In one possible embodiment, as shown in fig. 4 and 5, the first region 1041 of the elliptical reflector 104 is located on one side of the central axis of the reflector 104, and the first region 1041 projects in the direction of the first focal point 1071 to cover the first focal point 1071. In one possible embodiment, the first region 1041 may be a transparent glass or a hollow region. In one possible embodiment, a side of the first region 1041 close to the converging lens group 103 may be coated with an antireflection film, and in one possible embodiment, a side of the second region 1042 far from the converging lens group 103 is coated with a reflective film, or the second region 1042 is a reflective mirror. In a possible embodiment, the shape of the first region 1041 is an ellipse or a circle, and in a possible embodiment, the first region 1041 may be any regular shape or irregular shape, which the present application does not limit. In a possible embodiment, the area of the first region 1041 may be equal to the spot size of the excitation beam incident on the surface of the light reflecting bowl 104, and in a possible embodiment, the area of the first region 1041 may be larger than the spot size of the excitation beam incident on the surface of the light reflecting bowl 104.

The light pipe 106 has an incident surface at the second focal point 1072. In one possible embodiment, the light pipe 106 can be a rectangular light pipe 106, i.e., the area of the incident surface is equal to the area of the exit surface; in one possible embodiment, the light pipe 106 may be a wedge-shaped light pipe 106, i.e. the area of the light inlet is smaller than the area of the light outlet. This is not a limitation of the present application, as long as the light guide 106 can homogenize the light beam incident thereon.

In the present embodiment, the diffuse reflection structure 105 is located at the first focus 1071, and the light beam passing through the first region 1041 is incident on the diffuse reflection structure 105 and is diffusely reflected by the diffuse reflection structure 105. The diffuse reflection structure 105 may be a fixed diffuse reflection structure 105, or may be a moving diffuse reflection structure 105, which is not limited in this application. In this embodiment, the diffuse reflection structure 105 is located at the first focus 1071 of the elliptical light reflecting bowl 104 (as shown in fig. 4), and correspondingly, the light guide 106 is located at the second focus 1072. In one possible embodiment, however, the diffuse reflecting structure 105 may not be precisely located at the first focal point 1071, and as shown in fig. 11 for example, D1 is the long diameter of the elliptical reflecting bowl, the diffuse reflecting structure 105 is located within a cylinder centered on the first focal point 1071, having a radius R and a height h, and having a high vertical focal plane. Wherein R =0 to 20% by weight, D1, h =0 to 10% by weight, of the total weight of the steel sheet. The light pipe 106 has a center point of the light incident surface within a cylinder, the cylinder has a second focus 1072 as a cylinder center, a radius R, a height h, and a high vertical focal plane. Wherein R =0 to 20% by weight, D1, h =0 to 10% by weight, of the total weight of the steel sheet.

Fig. 11 only schematically shows the relationship between the parameters, and the dimensions are not used in practice and are only referred to.

As shown in fig. 4, in the light path structure, the red, green, and blue excitation light beams emitted by the light emitting device 101 are collimated by the collimating lens group 102 to become parallel light beams, and then enter the converging lens group 103, the converging lens group 103 converges the light beams, and emits the light beams to the light reflecting bowl 104, the light beam converging point is not located on the central axis H of the light reflecting bowl 104, the light beams enter the elliptical light reflecting bowl 104 in an off-axis manner, pass through the first region 1041, enter the diffuse reflection structure 105, pass through the diffuse reflection effect of the diffuse reflection structure 105, and then emit the light beams to the light reflecting bowl 104, are reflected by the second region 1042 of the light reflecting bowl 104, converge at the second focus 1072, and enter the light guide 106.

In another possible embodiment, as shown in fig. 6, the diffuse reflection structure 105 is located at the second focus 1072, in a possible embodiment, the diffuse reflection structure 105 may not be located precisely at the second focus 1072, for example, D1 is a long diameter of an elliptical light reflecting bowl, the diffuse reflection structure 105 is located in a plane passing through the focal plane 110 with the first focus 1071 as a center and with a radius of 0 to 20 dd 1, and in a possible embodiment, the diffuse reflection structure may be located in a range of h, h =0 to 10 dd 1, with the focal plane as a center plane and a perpendicular distance from the focal plane satisfying the above conditions.

The in-plane center point of the light guide 106 is located at the first focus 1071, but in a possible embodiment, D1 is the long diameter of the elliptical light-reflecting bowl, the in-plane center point of the light guide 106 is located within the plane passing through the focal plane 110 with the second focus 1072 as the center and the radius ranging from 0 to 20% dd 1, and in a possible embodiment, the in-plane center point of the light guide may be located within the range of h =0 to 10% dd 1 with the focal plane as the center plane and the perpendicular distance from the focal plane satisfying the above conditions.

As shown in fig. 7, fig. 7 is another light source structure provided by the present application, which includes a light emitting device 101, wherein the light emitting device 101 includes a red laser element, a blue laser element 1012 and a green laser element 1013, and the red laser element includes a first red laser element 1010 and a second red laser element 1011; a converging lens group 103 converging an incident light beam; the reflector set includes a first reflector 1080, a second reflector 1081, a third reflector 1082 and a fourth reflector 1083.

In one possible embodiment, the reflecting mirror groups are all reflecting mirrors, and in one possible embodiment, the reflecting mirror groups can be transparent mirrors with reflective coatings coated on the surfaces, the surfaces of the first reflecting mirror 1080 and the second reflecting mirror 1081 are coated with a reflective material capable of at least reflecting red laser light, the surface of the second reflecting mirror 1081 is coated with a reflective material capable of at least reflecting blue laser light, and the surface of the fourth reflecting mirror 1083 is coated with a reflective material capable of at least reflecting green laser light.

As shown in fig. 7, the light emitting device 101 includes a red laser element including a first red laser element 1010 and a second red laser element 1011, a blue laser element 1012 and a green laser element 1013, wherein a light beam emitted by the red laser element changes an infusion propagation direction through a first reflector 1080 and a second reflector 1081, enters the converging lens group 103, passes through the converging lens group 103, and then exits to the light reflecting bowl 104.

In a possible implementation manner, the red excitation light beam may be one or two, and the two red excitation light beams may be emitted by two groups of laser assemblies, or may be obtained by splitting one excitation light beam emitted by one group of red laser assemblies. This is not limited by the present application.

Fig. 8 provides another possible light source architecture. As shown in fig. 8, the light emitting device 101 includes a red laser element, a blue laser element 1012, a green laser element 1013, a first reflector 1080, a second reflector 1081, a third reflector 1082, and a fourth reflector 1083.

As shown in fig. 8, the excitation light beam emitted from the first red laser component 1010 is incident on the first reflecting mirror 1080 and is reflected by the first reflecting mirror 1080, and in a possible embodiment, the first reflecting mirror 1080 may be a reflecting structure coated with a full-band reflecting film layer, or a structure at least coated with a reflecting material for reflecting a red excitation light band.

The excitation beam from the second red laser assembly 1011 is incident on the second mirror 1081 and reflected by the second mirror 1081. In one possible embodiment, the first mirror 1080 may be a reflective structure coated with a full-wavelength reflective film or coated with a reflective material that reflects red excitation light.

The excitation beam from the blue laser module 1012 is incident on the third mirror 1082 and reflected by the third mirror 1082. In one possible embodiment, the surface of the third reflector 1082 is coated with a reflective film that reflects blue light and transmits red light, or in one possible embodiment, the surface of the third reflector 1082 may be coated with a reflective film that reflects blue and green excitation light and transmits red excitation light.

The excitation light beam emitted from the green laser unit 1013 is incident on the fourth mirror 1083, and is reflected by the fourth mirror 1083. In one possible embodiment, the fourth mirror 1083 is coated with a layer that reflects green excitation light, and transmits red and blue excitation light.

Fig. 9 provides another possible embodiment. As shown in fig. 9, the device includes a light emitting device 101, a reflector group and a converging lens group 103. In implementing the reflection function, the present embodiment is implemented in the following manner.

The excitation light beam emitted by the first red laser module 1010 is incident on the first reflecting mirror 1080, and the surface of the first reflecting mirror 1080 is coated with a film layer capable of reflecting the red excitation light, and in a possible embodiment, the first reflecting mirror 1080 is coated with a total reflection film layer or a film layer reflecting red and green or red and blue.

The excitation beam from the second red laser assembly 1011 is incident on a second mirror 1081, and the second mirror 1081 is coated with a layer that reflects red excitation light, and in one possible embodiment, the second mirror 1081 is coated with a layer that reflects either red or green, or red or blue.

The excitation light emitted from the blue laser module 1012 is incident on the third mirror 1082, and the surface of the third mirror 1082 is coated with a film layer capable of reflecting at least the blue excitation light.

The excitation light emitted from the green laser module 1013 is incident on the fourth mirror 1083, and the surface of the fourth mirror 1083 is coated with a film layer capable of at least reflecting the green excitation light and transmitting the blue excitation light. In one possible embodiment, the fourth mirror 1083 is coated with a layer that reflects green excitation light and transmits red and blue excitation light. This is not limited by the present application.

It can be understood that the parallel light beams emitted by the collimating lens group in the present application are substantially parallel light beams.

The application also provides projection equipment which comprises a light source assembly, a light machine assembly, a lens assembly and a screen. And light beams emitted by the light source component are modulated by the optical machine component and then emitted to a screen by the lens component. Through the structural arrangement of the light source component, the color cast or color spot phenomenon generated when the imaging light beam enters the screen due to the polarization characteristic is improved, and the structure is compact.

All figures in this application are only schematic illustrations.

The term "and/or" in this application is only one kind of association relationship describing the associated object, and means that there may be three kinds of relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship. The term "at least one of a and B" in the present application is only one kind of association relationship describing an associated object, and means that three kinds of relationships may exist, for example, at least one of a and B may mean: a exists alone, A and B exist simultaneously, and B exists alone. The term "A, B and at least one of C" means that there may be seven relationships that may mean: there are seven cases of A alone, B alone, C alone, both A and B, both A and C, both C and B, and both A, B and C. In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (13)

1. A light source assembly, comprising: the device comprises a light-emitting device, a collimating lens group, a converging lens group, a reflecting bowl and a diffuse reflection structure;

the light-emitting device is used for emitting red, blue and green exciting lights;

the collimating lens group collimates the exciting light emitted by the light-emitting device and emits light beams to the converging lens group;

the converging lens group is positioned between the collimating lens group and the reflecting bowl and converges incident light beams;

the light reflecting bowl comprises a first area and a second area;

the diffuse reflection structure performs diffuse reflection on the light beams incident to the diffuse reflection structure;

the red, green and blue excitation light beams emitted by the light-emitting device are collimated by the collimating lens group and then enter the converging lens group, are converged by the converging lens group and then emit to the first area of the light reflecting bowl, and then enter the diffuse reflection structure after passing through the first area and are subjected to diffuse reflection by the diffuse reflection structure, and the light beams subjected to diffuse reflection by the diffuse reflection structure enter the light reflecting bowl and are reflected and converged by the second area.

2. The light source assembly of claim 1, wherein the diffuse reflective structure is a fixed diffuse reflective structure.

3. The light source assembly according to claim 1, wherein the diffuse reflecting structure is a sporty diffuse reflecting structure.

4. The light source module of claim 1, wherein the reflector is a circular reflector, and the diffuse reflection structure and the dodging assembly are respectively located on two sides of a plane passing through a focal point of the circular reflector and perpendicular to the focal plane.

5. The light source module according to claim 4, wherein the diffuse reflective structure is located within a cylinder centered on the circular reflector focus, having a radius R, a height h, and a vertical focal plane, wherein R =0 to 20% by weight D, h =0 to 10% by weight D, D is the diameter of the circular reflector through the focus.

6. The light source module as claimed in claim 5, wherein the light source module further comprises a light homogenizing module, the center point of the light inlet of the light homogenizing module is located in a cylinder, the cylinder takes the circular reflector focus as the center of the cylinder, the radius is R, the height is h, and the vertical focal plane is high, wherein R =0 to 20% of D, h =0 to 10% of D, and D is the diameter of the circular reflector passing through the focus.

7. The light source module of claim 1, wherein the reflector is an elliptical reflector, the diffuse reflection structure is located within a cylinder, and the cylinder has a first focus of the elliptical reflector as a center of cylinder, a radius of R, a height of h, and a high vertical focal plane;

wherein, R =0 to 20% by weight of D1, h =0 to 10% by weight of D1, and D1 is the long diameter of the elliptical reflector.

8. The light source component of claim 7, wherein the light source component further comprises a light homogenizing component, the light reflecting bowl is an elliptical light reflecting bowl, a center point of a light incident surface of the light homogenizing component is located within a range of a cylinder, the cylinder takes a first focus of the elliptical light reflecting bowl as a center of cylinder, has a radius of R, a height of h and a high vertical focal plane;

wherein, R =0 to 20% by weight of D1, h =0 to 10% by weight of D1, and D1 is the long diameter of the elliptical reflector.

9. The light source module according to claim 1, wherein the first region is a transparent glass or a hollowed-out region.

10. The light source assembly of claim 1, wherein the area of the first region is larger than or equal to the area of a spot of a light beam emitted by the converging lens group and incident on the surface of the reflector.

11. The light source module of claim 7 or 8, wherein the light beam emitted from the converging lens group is incident to the elliptical reflecting bowl off-axis.

12. The light source module as claimed in claim 1, wherein the light source module further comprises a reflector group, the excitation light beam emitted from the light emitting device is collimated by the collimating lens group, then enters the reflector group in parallel, is reflected by the reflector group, then enters the converging lens group, then enters the light reflecting bowl after being converged, and enters the diffuse reflection structure after passing through the first area, and the light beam diffusely reflected by the diffuse reflection structure enters the dodging module after being reflected by the prime number second area.

13. A projection device comprising a light source module according to any one of the preceding claims.

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