CN115702385A - Light source assembly and projection equipment - Google Patents

Abstract

A light source assembly and a projection apparatus, the light source assembly (10) comprising: a laser (101) in which a first light-emitting region (Y1) emits first laser light and a second light-emitting region (Y2, Y21, Y22) emits second laser light having a divergence angle smaller than that of the first laser light; the first light combining lens group (102) reflects the first laser to a light outlet of the light source component (10); the second light combining lens group (103) comprises m light combining lenses which are sequentially arranged along the light emergent direction of the second light emitting area (Y2, Y21 and Y22), a gap is formed between the ith light combining lens and the (i + 1) th light combining lens in the m light combining lenses, m is more than or equal to 2, i is more than or equal to 1 and is less than or equal to m-1; the ith light combining lens comprises a reflection area (a 1, a2, a 3) and a transmission area (b 1, b2, b 3), the reflection area (a 1, a2, a 3) reflects the incident second laser to the light outlet, and the transmission area (b 1, b2, b 3) transmits the incident second laser to the (i + 1) th light combining lens; the m-th light combining lens reflects the incident second laser to the light outlet.

Description

Light source assembly and projection equipment

Cross Reference to Related Applications

The present application claims priority from the chinese patent application having application number 202010641579.5 entitled "light source assembly and projection apparatus" filed by the chinese patent office on 6/7/2020, which is incorporated herein by reference in its entirety.

Technical Field

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

Background

With the development of display technology, the requirement for the display effect of the projection picture of the projection device is higher and higher. The projection equipment comprises a light source component, wherein the light source component is used for providing light rays required by forming a projection picture, and the display effect of the projection picture formed by the light rays with higher uniformity is better.

Disclosure of Invention

An aspect of the present embodiments provides a light source assembly, including:

a laser having a first light emitting region and a second light emitting region; the first light emitting area is used for emitting first laser, the second light emitting area is used for emitting second laser, and the divergence angle of the first laser is larger than that of the second laser;

the first light combining lens group is positioned on the light emitting side of the first light emitting area and used for reflecting the first laser emitted by the first light emitting area to the light outlet of the light source component;

the second light combining lens group is positioned on the light emitting side of the second light emitting area; the second light combining lens group comprises m light combining lenses which are sequentially arranged along the light emitting direction of the second light emitting area, a gap is formed between the ith light combining lens and the (i + 1) th light combining lens in the m light combining lenses, m is more than or equal to 2, i is more than or equal to 1 and less than or equal to m-1; the ith light combining lens comprises a reflection area and a transmission area, wherein the reflection area is used for reflecting the incident second laser to the light outlet, and the transmission area is used for transmitting the incident second laser to the (i + 1) th light combining lens; the m-th light combining lens is used for reflecting the second laser to the light outlet.

In another aspect of the embodiments of the present application, there is provided a projection apparatus, including: the light source assembly, the optical machine and the lens are arranged; the light source assembly is used for emitting light to the ray machine, the ray machine is used for converging the light that the light source assembly sent to the camera lens, the camera lens is used for projecting the light after the ray machine converges.

Drawings

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

Fig. 1 is a schematic structural diagram of a projection apparatus provided in the related art;

fig. 2 is a schematic structural diagram of a light source module provided in an embodiment of the present disclosure;

fig. 3 is a schematic structural view of a second light combining lens set according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of an MCL-type laser according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of another light source module according to the embodiments of the present disclosure;

fig. 6 is a schematic structural view of another second light combining lens set according to the embodiment of the present application;

FIG. 7 is a schematic view of a partial structure of a light source module according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of a light source module according to another embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a light source module provided in the related art. As shown in fig. 1, the light source assembly 00 includes: the light source comprises a laser 001, a first light combining lens J1, a second light combining lens J2, a third light combining lens J3 and a converging lens 003, wherein the converging lens 003 is positioned at a light outlet of the light source component 00. The laser 001 has a light-emitting region Q3, a light-emitting region Q2, and a light-emitting region Q1 arranged in this order in a target direction (x direction in fig. 1) perpendicular to the light-outgoing direction (y direction in fig. 1) of the laser 001. The light emitting region Q1 may emit red laser light, the light emitting region Q2 may emit blue laser light, and the light emitting region Q3 may emit green laser light. The first light combining lens J1 is located on the light emitting side of the first light emitting region Q1, the second light combining lens J2 is located on the light emitting side of the light emitting region Q2, the third light combining lens J3 is located on the light emitting side of the third light emitting region Q3, and the third light combining lens J3, the second light combining lens J2, the first light combining lens J1 and the converging lens 003 are sequentially arranged along the x direction. The red laser beam emitted from the emitting region Q1 may be emitted to the first light combining lens J1, reflected by the first light combining lens J1, and emitted to the condenser lens 003. The blue laser beam emitted from the emitting region Q2 may be emitted to the second light combining lens J2, reflected on the second light combining lens J2, and then emitted to the condenser lens 003 through the first light combining lens J1. The green laser light emitted from the emitting region Q3 may be emitted to the third light combining lens J3, and after being reflected on the third light combining lens J3, the green laser light sequentially passes through the second light combining lens J2 and the first light combining lens J1 and is emitted to the condenser lens 003. In this way, the green laser light, the blue laser light, and the red laser light emitted from the laser 001 are mixed and converged by the condenser lens 003. Further, projection of a projection screen can be performed based on the mixed laser light.

However, since the divergence angle of the red laser beam emitted from the laser 001 is larger than the divergence angles of the green laser beam and the blue laser beam, the spot size formed by the red laser beam on the condenser lens 003 is larger than the spot sizes formed by the green laser beam and the blue laser beam on the condenser lens 003, and the spot distribution on the condenser lens 003 exhibits a more significant inner-outer color boundary phenomenon. For example, the light spots are circular, the outermost circles are red, and the inner circles are different concentric circles such as purple, blue and the like. Therefore, the uniformity of the laser light condensed by the condenser lens 003 is poor, and the display effect of the projection screen formed by projection with the laser light is also poor.

The following embodiment of this application provides a light source subassembly and projection equipment, and this light source subassembly can send the higher laser of homogeneity, and then can improve the display effect according to the projection picture that this laser formed.

Fig. 2 is a schematic structural diagram of a light source module provided in an embodiment of the present disclosure. As shown in fig. 2, the light source assembly 10 may include: the laser device 101, the first optical lens group 102 and the second optical lens group (for example, the second optical lens groups 103a and 103 b).

Here, the laser 101 has a first light-emitting region Y1 and a second light-emitting region, and fig. 2 illustrates an example in which the laser 101 has two second light-emitting regions Y21 and Y22. The first light emitting region Y1 is configured to emit first laser light, the second light emitting region is configured to emit second laser light, and a divergence angle of the first laser light is larger than a divergence angle of the second laser light.

The first light combining lens group 102 is located on the light emitting side of the first light emitting region Y1. The first light combining lens group 102 is configured to reflect the first laser light emitted from the first light emitting area Y1 to the light outlet K of the light source module 00.

The second light combining lens group is located on the light emitting side of the second light emitting area, for example, the second light combining lens group 103a is located on the light emitting side of the corresponding second light emitting area Y21, and the second light combining lens group 103b is located on the light emitting side of the corresponding second light emitting area Y22. In the following, the second combined optical lens set 103a is taken as an example to describe the second combined optical lens set in the embodiment of the present application, and the second combined optical lens set 103a may include a light emitting direction along the second light emitting area (for example, the y direction in fig. 2)To) m light-combining lenses arranged in sequence, wherein the ith light-combining lens P in the m light-combining lenses _i And the (i + 1) th light combining lens P _i+1 A gap is arranged between the two, m is more than or equal to 2, i is more than or equal to 1 and less than or equal to m-1. Fig. 2 illustrates an example of m = 2. Wherein, the ith light-combining lens P _i A reflective region and a transmissive region may be included. Fig. 3 is a schematic structural view of a second light combining lens set according to an embodiment of the present application. The second light combining lens set 103a shown in fig. 3 can be a left side view of the second light combining lens set 103a shown in fig. 2. As shown in fig. 3, the first light combining lens P in the second light combining lens group 103a ₁ The reflection area of the first lens assembly P can comprise a reflection area a11, a reflection area a12, a reflection area a13 and a reflection area a14 ₁ May include a transmissive region b11, a transmissive region b12, and a transmissive region b13. Each reflection region is configured to reflect the incident second laser to the light exit K of the light source assembly 10, and each transmission region is configured to transmit the incident second laser to the (i + 1) th light combining lens P _i+1 . The mth light combining lens P in the second light combining lens group 103 _m And is used for reflecting the second laser to the light outlet K. It should be noted that, for convenience of illustration, fig. 2 only schematically shows the transmission paths of several light rays, and the light rays incident on each of the reflective area and the transmissive area are not illustrated.

In one embodiment, the light combining lens sets and the light outlets may be arranged in a target direction (e.g., x direction in fig. 2). The ith light combining lens P of the second light combining lens group _i The arrangement direction of the transmissive region and the reflective region in (b) may be perpendicular to the light exit direction (y direction) of the laser and perpendicular to the target direction. Such as the light-combining lens P in FIG. 3 ₁ The transmissive and reflective regions in (b) may be arranged in a z-direction, which may be a direction perpendicular to the plane of the paper in fig. 2, the z-direction being perpendicular to the x-direction and the y-direction. For example, the light combining lens may have a length direction and a width direction, the z direction in fig. 3 may be the length direction of the light combining lens, and the transmission area and the reflection area in the light combining lens may be arranged in the length direction. In one embodiment, the transmissive and reflective regions of the light combining lens may also be arranged in the lensIn the width direction, the light combining principle of the light combining lens in this way is the same as that of the light combining lens shown in fig. 3, and the embodiment of the present application is not described again.

In projection apparatus, each part in the light source module 10 can encapsulate in a casing, and the casing of this light source module 10 can have light-emitting window K, and light source module 10 can transmit light to projection apparatus's ray apparatus through this light-emitting window K, is called the light-emitting window K of light source module 10 with the light-emitting window K of this casing in the embodiment of this application. The laser 101 in the light source assembly 10 can emit laser light of multiple colors to be transmitted to the light outlet K. The plurality of light emitting regions in the laser 101 may be a plurality of regions in the light exit surface of the laser 101. In one implementation, the colors of the laser light emitted by different light emitting regions may be different. The laser 101 may have only one light emitting direction (e.g., the y direction in fig. 2), and the light emitting direction of each light emitting region in the laser 101 is the same as the light emitting direction of the laser 101. The laser transmitted to the light outlet K needs to be laser obtained by mixing lasers of multiple colors emitted by the laser 101, and certain requirements are also imposed on the spot size of the laser transmitted to the light outlet K; therefore, the light outlet K is not directly disposed in the light emitting direction of the laser 101, and a light combining lens is further disposed between the laser 101 and the light outlet K to adjust and mix the laser light emitted from the laser 101 and transmit the laser light to the light outlet K. For example, the light-emitting side of each light-emitting region of the laser 101 is provided with a light-combining lens group to reflect the laser light emitted by the corresponding light-emitting region to the light-emitting port K.

As shown in fig. 2, in the embodiment of the present application, the first light combining lens group 102 is disposed on the light emitting side of the first light emitting area Y1, and the first light combining lens group 102 includes only one light combining lens. In one implementation, the first light combining lens set 102 may also include a plurality of light combining lenses. If the orthographic projections of the plurality of light combining lenses on the first light emitting area have no overlapping area, and if the surfaces of the plurality of light combining lenses for reflecting the first laser light can be coplanar.

In the embodiment of the application, the light-emitting side of the second light-emitting region is provided with a second light-combining lens group, and the second light-combining lens groupThe optical lens group comprises two optical lens combinations (respectively optical lens combination P) which are sequentially arranged along the y direction ₁ Combined lens P ₂ ) I.e. m =2 as an example. The first light combining lens P in the m light combining lenses included in the second light combining lens group ₁ The m-th light-combining lens P is the light-combining lens closest to the second light-emitting region _m The light combining lens is farthest from the second light emitting area. The second laser light emitted by the second light emitting region can be emitted to the corresponding second light combining lens group. Since the front m-1 light combining lenses of the m light combining lenses have a transmission region and a reflection region, the second laser can penetrate through the front light combining lens (i.e. the ith light combining lens P) of the m light combining lenses _i ) The transmission area in (a) is transmitted to the rear light combining lens (i.e. the ith light combining lens P) _i+1 ) And the second laser beam can be reflected to the light outlet K by the reflection area when being emitted to the reflection area in any light combining lens. When the second laser beam is emitted to the mth light combining lens, the second laser beam can be directly reflected to the light outlet K by the mth light combining lens. Referring to fig. 2 and 3, the light emitted from the second light-emitting region is directed to the first light-combining lens P ₁ The second laser of the four transmission areas in the first lens group is transmitted to the second light combining lens P ₂ And then combined optical lens P ₂ Reflected to emit to the light outlet K and to the first light combining lens P ₁ The second laser light of the three reflection areas in (b) is directly reflected to be emitted to the light outlet K.

A gap is formed between the ith light combining lens and the (i + 1) th light combining lens in the m light combining lenses in the second light combining lens group, that is, a gap is formed between any two adjacent light combining lenses in the y direction in the m light combining lenses. Therefore, the second laser emitted by the second light emitting region transmits a certain optical path to the (i + 1) th light combining lens after passing through the (i) th light combining lens, and is reflected to the light outlet K under the action of the (i + 1) th light combining lens. Therefore, the second laser beam emitted to the light outlet K covers the range from the first light combining lens to the mth light combining lens, and the light spot formed by the second laser beam at the light outlet K is large.

As can be seen from comparing the light source modules shown in fig. 1 and fig. 2, in the related art, the laser beams emitted from the light emitting region Q2 and the light emitting region Q3 are directly reflected on a light combining lens to be emitted to the light outlet, and the laser beams are thinner, have smaller light spots formed at the light outlet, and are more concentrated at the center of the light outlet. And among the light source subassembly that this application embodiment provided, the second laser can be reflected with the directive light exit on a plurality of light lens that close that have the clearance each other, so can divide into the directive light exit behind the multiplet with thinner second laser beam, and this multibeam second laser can occupy great regional transmission, and then the facula that the second laser formed at the light exit can be great, and the size difference of the facula that forms with first laser can be less.

To sum up, in the light source module provided by the embodiment of the present application, the second light combining lens group is located at the light emitting side of the second light emitting area of the laser, and a plurality of light combining lenses in the second light combining lens group are arranged along the light emitting direction of the second light emitting area and a gap is formed between two adjacent light combining lenses. The light combining lens in front of the last light combining lens in the second light combining lens group comprises a transmission area and a reflection area, the second laser light emitted to the reflection area can be directly reflected to the light outlet by the reflection area, the second laser light emitted to the transmission area can pass through the transmission area to be emitted to the next light combining lens, and the second laser light emitted to the last light combining lens can be reflected to the light outlet. Therefore, the second laser emitted by the second light emitting region of the laser can be emitted to the light outlet from the plurality of light combining lenses with gaps therebetween, the second laser emitted to the light outlet can cover a larger range, and a light spot formed by the second laser at the light outlet can be larger. Even the divergence angle of the first laser that first luminous region sent is great makes the facula that first laser formed at the light-emitting opening great, it is less that the facula size difference that the facula that the second laser formed and first laser formed also can be guaranteed through a plurality of light combination lenses in this application in this second light combination lens group, and then guarantees that the laser homogeneity that first laser and second laser mix and obtain is higher at light-emitting opening department.

In addition, because the uniformity of the laser emitted by the light source component is high, the projection equipment adopting the light source component can form a projection picture with a good display effect according to the laser with high uniformity.

In the embodiment of the present application, the laser 101 may have at least two light emitting regions. When the laser has a plurality of second light-emitting areas and the light source assembly includes a plurality of second light-combining lens sets, each second light-combining lens set corresponds to one second light-emitting area, different second light-combining lens sets correspond to different second light-emitting areas, and each second light-combining lens set is located at the light-emitting side of the corresponding second light-emitting area. Fig. 2 is a schematic view of an example in which the laser 101 has one first light-emitting region Y1 and two second light-emitting regions Y21 and Y22. In a specific implementation, the laser 101 may have only one second light emitting region, or the laser 101 may have three or more second light emitting regions, or the laser 101 may have a plurality of first light emitting regions, which is not limited in the embodiment of the present application.

In this embodiment, the divergence angle of the laser light emitted by any one of the second light emitting regions may be smaller than the divergence angle of the laser light emitted by any one of the first light emitting regions. For example, the first light-emitting region Y1 in fig. 2 may emit red laser light, the second light-emitting region Y21 may emit green laser light, the second light-emitting region Y22 may emit blue laser light, and the divergence angles of the blue laser light and the green laser light may each be smaller than the divergence angle of the red laser light. In another example, assuming that the divergence angles of the red laser beam and the blue laser beam emitted by the laser devices are both larger than the divergence angle of the green laser beam, the light emitting regions emitting the red laser beam and the blue laser beam may be both determined as the first light emitting region, only the light emitting region emitting the green laser beam may be determined as the second light emitting region, and the second combined optical lens group may be provided only on the light emitting side of the light emitting region emitting the green laser beam.

The Laser 101 in the light source assembly 10 provided in the embodiment of the present application may be a multi _ chip Laser Diode (MCL) type Laser. Fig. 4 is a schematic structural diagram of an MCL-type laser according to an embodiment of the present disclosure, and the laser 101 shown in fig. 2 may be a schematic diagram of a section d-d' of the laser 101 shown in fig. 4 after being flipped. As shown in fig. 4, the MCL laser may include a plurality of light emitting chips (not shown in fig. 3) packaged in the same package G in an array arrangement, each light emitting chip may emit laser light independently, and the laser light emitted by each light emitting chip may be emitted through its corresponding collimating lens T. The laser 101 shown in fig. 4 may include 24 light emitting chips arranged in 6 rows and 4 columns, wherein the first light emitting area Y1 may include an area where two rightmost columns of light emitting chips in fig. 4 are located, the second light emitting area Y21 may include an area where one leftmost column of light emitting chips is located, and the second light emitting area Y22 may include an area where one second column of light emitting chips is located. Because the laser volume of MCL type is less, and the luminance of the laser that sends is higher, so the light source subassembly that this application embodiment provided adopts this laser instrument can reduce the volume of light source subassembly, is favorable to realizing projection equipment's miniaturization. It should be noted that, in the embodiment of the present application, for example, the laser 101 may include 24 light emitting chips arranged in 6 rows and 4 columns, and the laser 101 may also include 20 light emitting chips arranged in 4 rows and 5 columns, or 15 light emitting chips arranged in 3 rows and 5 columns, or 14 light emitting chips arranged in 2 rows and 7 columns, which is not limited in the embodiment of the present application.

With reference to fig. 2, the light-emitting areas in the light source assembly 10 may be arranged along a target direction (i.e., an x direction in fig. 2), and further, the light combining lens groups may also be arranged along the target direction. Since the light combining lens group needs to reflect the incident laser light to the light outlet, the light combining lens groups and the light outlet can be arranged in the target direction. The target direction may intersect the light emitting direction of the laser 101, for example, the target direction may be perpendicular to the light emitting direction of the laser 101, or the target direction may form an acute angle or an obtuse angle with the light emitting direction of the laser 101. In a specific implementation, the light emitting regions may also be arranged in a scattered manner or in a circumferential manner, or in other arrangements, and the embodiments of the present application are not limited thereto.

In the embodiment of the present application, the light source assembly 10 includes at least two combined optical lens sets, and each combined optical lens set and the light outlet may be all arranged in the target direction, so there may be a certain combined optical lens set located between the light outlet and another combined optical lens set. The combined optical lens group emits the reflected laser to the light outlet, and it is necessary to ensure that the laser passes through the other combined optical lens group, so that the combined optical lens group positioned between the light outlet and any combined optical lens group in the light source assembly is also used for: the laser emitted from any light combining lens group is transmitted.

For example, in fig. 2, the second combined optical lens set Y22 is located between the second combined optical lens set Y21 and the light outlet K, so that the second combined optical lens set Y22 may also be used to transmit the laser light (such as green laser light) emitted from the second combined optical lens set Y21, that is, the combined optical lens in the second combined optical lens set Y22 is used to transmit the green laser light. The first combined optical lens group Y1 is located between the second combined optical lens group Y21 and the light exit K, and is located between the second combined optical lens group Y22 and the light exit K, so the first combined optical lens group Y1 may also be used to transmit the laser (such as green laser) emitted from the second combined optical lens group Y21 and the laser (such as blue laser) emitted from the second combined optical lens group Y22, that is, the combined optical lens in the first combined optical lens group Y1 is also used to transmit the green laser and the blue laser. Therefore, the second combined lens group Y21 can reflect the green laser beam, the second combined lens group Y22 can reflect the blue laser beam and transmit the green laser beam, and the first combined lens group Y1 can reflect the red laser beam and transmit the green laser beam and the blue laser beam.

The second light combining lens set in the light source module is described below with reference to the accompanying drawings:

in the embodiment of the present application, the light emitting directions (for example, the y direction in fig. 2) of the m light combining lenses of the second light combining lens group and the second light emitting area may intersect. If the light receiving surface of the m light combining lenses for the laser light emitted by the second light emitting region intersects with the light emitting direction, the light receiving surface of the light combining lenses is also the surface of the light combining lenses close to the second light emitting region. In one embodiment, the m light combining lenses of the second light combining lens set may be parallel, for example, the m light combining lenses are parallel to the light receiving surface of the laser light emitted from the second light emitting region. Each light combining lens in the second light combining lens group may have a plate-shaped structure, the plate-shaped structure has two parallel larger plate surfaces and a plurality of smaller side surfaces connecting the two plate surfaces, and the light receiving surface is one of the two plate surfaces close to the second light emitting area. The thickness of the light combining lens is thinner, so that the light combining lens is regarded as a plane, and therefore the light combining lens can also be directly called as the light combining lens which is intersected with the light emergent direction, and the m light combining lenses are parallel. In one embodiment, an included angle between the light combining lens of the second light combining lens group and the light emitting direction of the second light emitting area may range from 43 degrees to 45 degrees. In one specific implementation, an included angle between the light combining lens in the first light combining lens group and the light emitting direction of the laser may also be in a range of 43 degrees to 45 degrees.

In the embodiment of the present application, in the m light combining lenses of the second light combining lens group, at least the first light combining lens includes a plurality of reflection areas and a plurality of transmission areas, and the reflection areas and the transmission areas may be alternately disposed. For example, referring to fig. 3, the first light combining lens P in the second light combining lens group 103a ₁ The LED display panel comprises a reflection area a1, a transmission area b1, a reflection area a2, a transmission area b2, a reflection area a3, a transmission area b3 and a reflection area a4 which are sequentially arranged along the z direction. Therefore, the laser beams emitted by the second light emitting area can be divided into a plurality of beams and emitted out in a large occupied area, and the transmission area and the reflection area are alternately arranged to ensure that the areas reflecting the laser beams from the light combining lenses are uniformly distributed, so that the laser beams emitted from the light combining lenses are uniformly distributed. In one embodiment, when m is greater than or equal to 3, other light combining lenses (such as a second light combining lens) comprising a plurality of reflection areas and a plurality of transmission areas can be present besides the first light combining lens. In one embodiment, the areas of the transmissive regions and the reflective regions may be the same, so as to further ensure that the laser beams emitted from the light-combining lenses are distributed more uniformly.

It should be noted that fig. 2 only exemplifies that the second light combining lens set includes two light combining lenses (i.e., m = 2), and fig. 3 only exemplifies that the first light combining lens includes four reflective areas and three transmissive areas, and both ends of the first light combining lens are reflective areas. In one specific implementation, the second light combining lens group may also include three, four or even more light combining lenses, the number of the reflection areas in the first light combining lens may also be three, five or other numbers, and the number of the transmission areas may also be two, three or other numbers; both ends of the first light combination lens can also be transmission areas, and the number of the transmission areas in the first light combination lens is more than that of the reflection areas; or one end of the first light combining lens can be a transmission area and the other end is a reflection area, and the number of the transmission areas and the number of the reflection areas in the first light combining lens are the same; the areas of the transmissive regions and the reflective regions may also be different, and the embodiments of the present application are not limited.

In one embodiment, the number of the transmissive regions and the reflective regions in the second light combining lens group may be related to the number and arrangement of the light emitting chips in the second light emitting region. For example, the sum of the numbers of the transmission areas and the reflection areas in the first light combining lens of the second light combining lens group is equal to the number of the light emitting chips arranged in the second light emitting area in a certain direction, and the arrangement direction of the transmission areas and the reflection areas is parallel to the arrangement direction of the light emitting chips in the second light emitting area. For example, the laser in the embodiment of the present application may include light emitting chips arranged in 4 rows and 7 columns, and the second laser light emitted by the second light emitting region may be emitted by 7 light emitting chips in one column of the laser, so that the laser beam emitted by the second light emitting region may be divided into 7 beams. For example, the sum of the numbers of the transmission areas and the reflection areas in the first light combining lens of the second light combining lens group is 7, and it can be ensured that the laser light emitted by each light emitting chip is emitted to one transmission area or one reflection area. For another example, if the 7 light emitting chips are arranged in the z direction, the transmission area and the reflection area of the light combining lens of the second light combining lens group may also be arranged in the z direction.

In an alternative embodiment, the number of the combined optical lenses in the second combined optical lens group is more than 2, i.e. m ≧ 3. At this time, the jth light combining lens in the m light combining lenses can have a first transmission area, the jth +1 light combining lens can have a second transmission area corresponding to the first transmission area, and j is greater than or equal to 1 and less than m-1. On the second light emitting region, the orthographic projection of the first transmission region is at least partially overlapped with the orthographic projection of the second transmission region corresponding to the first transmission region, so that the first transmission region can emit at least part of the emitted second laser to the second transmission region corresponding to the first transmission region.

Fig. 5 is a schematic view of another light source module according to the present embodiment, and fig. 5 shows a laser 101 in a light source module 10 having two light-emitting regionsThe second combined optical lens set includes three combined optical lenses, i.e. m =3, for illustration. As shown in FIG. 5, the laser 101 has a first light-emitting area Y1 and a second light-emitting area Y2, and the second light combining lens group 103 includes three light combining lenses P ₁ 、P ₂ And P ₃ . Fig. 6 is a schematic structural view of another second light combining lens set according to the embodiment of the present application. The second light combining lens group 103 shown in fig. 6 can be a left side view of the second light combining lens group 103 shown in fig. 5. First light-combining lens P ₁ Comprises a transmission area b1, a reflection area a1, a transmission area b2, a reflection area a2 and a transmission area b3 which are arranged along the z direction; second light-combining lens P ₂ Including a reflective area a3, a transmissive area b4, and a reflective area a4 arranged in the target direction. The transmissive region b2 may be a first transmissive region, and the transmissive region b4 may be a second transmissive region corresponding to the transmissive region b 2. The orthographic projection of the transmission region b2 on the second light-emitting region Y2 is at least partially overlapped with the orthographic projection of the transmission region b4 on the second light-emitting region Y2, for example, the orthographic projection of the transmission region b2 on the second light-emitting region Y2 covers a partial area of the orthographic projection of the transmission region b4 on the second light-emitting region Y2. In the embodiment of the present application, the light emitting region of the laser includes a light emitting surface perpendicular to the light emitting direction (i.e., y direction), so that the orthographic projection of the transmissive region on the second light emitting region is the same as the orthographic projection of the transmissive region on the plane perpendicular to the y direction.

Thus, the second laser emitted by the second light emitting region Y2 can be emitted to the first light combining lens P1, and the second laser emitted to the transmission region b1 of the light combining lens P1 passes through the transmission region b1 and is emitted to the second light combining lens P ₂ The reflecting area a3 is further reflected to the light outlet K by the reflecting area a 3; the second laser beam emitted to the transmission area b3 passes through the transmission area b3 and is emitted to the second light combining lens P ₂ The reflective area a4 is further reflected by the reflective area a4 to the light outlet K. The second laser emitted to the transmission area b2 of the light combination lens P1 passes through the transmission area b2 and is emitted to the second light combination lens P ₂ The light beam further passes through the transmission area b4 and then towards the third light combining lens P ₃ Is combined by the third light-combining lens P ₃ Reflected to the light outlet K.Therefore, the second laser light emitted by the second light emitting region Y2 can be split by the three light combining lenses to emit the second laser light from the three light combining lenses, so that the transmission range of the second laser light is expanded, and the light spot of the second laser light at the light outlet K is larger.

Fig. 4 exemplifies that the size of the transmission region b2 is smaller than that of the transmission region b4, and the area of the orthographic projection of the transmission region b2 on the second light-emitting region Y2 is smaller than that of the transmission region b4 on the second light-emitting region Y2; the embodiment of the present application does not limit the size relationship between the transmissive region b2 and the transmissive region b 4. In an alternative example, the transmissive region b2 and the transmissive region b4 may have the same size, and an orthogonal projection of the transmissive region b2 on the second light emitting region Y2 and an orthogonal projection of the transmissive region b4 on the second light emitting region Y2 may completely coincide. In another alternative example, the size of the transmissive region b2 may be larger than the size of the transmissive region b4, and an orthographic area of the transmissive region b4 on the second light emitting region Y2 may be larger than an orthographic area of the transmissive region b2 on the second light emitting region Y2. At this time, the light is emitted from the transmission region b2 to the second light combining lens P ₂ A part of the second laser beam passes through the transmission area b4 and is emitted to the third light combining lens P ₃ The other part can be directed to a second light combining lens P ₂ A3 or a4, and further on the second light combining lens P ₂ Is reflected on the reflection area a3 or a4. The setting mode to transmission district and reflecting area in each closes the optical lens can set up as required in a flexible way, only need guarantee through the second laser of the transmission district in preceding closed optical lens can be at the last reflection of closed optical lens behind can, this application embodiment does not do the restriction. In one implementation, the number of reflective areas in a subsequent light combining lens of the m light combining lenses may be less than or equal to the number of transmissive areas in a previous light combining lens.

In an alternative embodiment, the light source module includes a plurality of second light-emitting areas and a plurality of second light combining lens sets. For any two of the second light combining lens groups: the orthographic projection of the target reflection area and the orthographic projection of the target transmission area at least partially coincide on a plane perpendicular to the target direction. The target reflection area belongs to a light combining lens of the second light combining lens combination far away from the light outlet, and the target transmission area belongs to a light combining lens of the second light combining lens combination close to the light outlet. The target reflection area can reflect the second laser to the target transmission area, so that the second laser is emitted to the light outlet through the target transmission area. Thus, the transmission area and the reflection area in the two light combining lens groups are arranged in an inserting way. In one embodiment, the number of the transmission areas of one of the two light combining lens groups is equal to the number of the reflection areas of the other light combining lens group.

Exemplarily, fig. 7 is a schematic partial structural view of a light source assembly provided in an embodiment of the present application. Fig. 7 is a bottom view of the first light combining lens, the first light combining lens set 102 and the light outlet K in the second light combining lens sets 103a and 103b in the light source module of fig. 2. Referring to fig. 2 and fig. 7, for the two second light combining lens sets 103a and 103b, the second light combining lens set 103a is far away from the light exit K, the second light combining lens set 103b is close to the light exit K, the reflection area in the second light combining lens set 103a is the target reflection area, and the transmission area in the second light combining lens set 103b is the target transmission area. On a plane perpendicular to the target direction (x direction), an orthogonal projection of the reflection area in the light combining lens of the second light combining lens group 103a coincides with an orthogonal projection of the transmission area in the light combining lens of the second light combining lens group 103 b. For example, the first light combining lens in the second light combining lens group 103a includes four reflection areas and three transmission areas, and the first light combining lens in the second light combining lens group 10b includes three reflection areas and four transmission areas. As shown in fig. 7, the first light combining lens in the second light combining lens group 103a includes a reflection area a11, a transmission area b11, a reflection area a12, a transmission area b12, a reflection area a13, a transmission area b13, and a reflection area a14 arranged along the z direction, and the first light combining lens in the second light combining lens group 10b includes a transmission area b21, a reflection area a21, a transmission area b22, a reflection area a22, a transmission area b23, a reflection area a23, and a transmission area b24 arranged along the z direction. The reflective region a11 may reflect the second laser light emitted from the second light emitting region Y21 to the transmissive region b21, and further transmit the second laser light to the light outlet K through the transmissive region b 21; the reflective region a12 may reflect the second laser light emitted from the second light emitting region Y21 to the transmissive region b22, and further pass through the transmissive region b22 to emit to the light outlet K; the reflective region a13 may reflect the second laser light emitted from the second light emitting region Y21 to the transmissive region b23, and further emit the second laser light to the light outlet K through the transmissive region b 23; the reflective region a14 may reflect the second laser light emitted from the second light emitting region Y21 to the transmissive region b24, and further emit the second laser light to the light outlet K through the transmissive region b24.

In the embodiment of the present application, when the light source module includes a plurality of second combined optical lens groups, the number of the combined optical lenses in each of the second combined optical lens groups may be the same or different, the areas of the combined optical lenses in each of the second combined optical lens groups may be the same or different, and the embodiment of the present application is not limited.

In the embodiment of the present application, the function of the second light combining lens group can be realized in the following manner:

in a first optional implementation manner, the ith light combining lens in the second light combining lens group includes: the i-th light-combining lens realizes the transmission of the laser with the fixed waveband and the reflection of the laser with the fixed waveband through the function of the dichroic film. The dichroic film of the transmissive region in the ith light-combining lens is used for: the dichroic film of the reflecting area in the ith light combining lens is used for: and reflecting the second laser light emitted by the second light emitting region corresponding to the second light combining lens group in the incident laser light. The dichroic films of the transmission area and the reflection area can also transmit laser emitted by other light combination lenses positioned on one side of the ith light combination lens far away from the light outlet. For example, the dichroic film of the reflective region in the first light combining lens of the second light combining lens group 103a in fig. 2 may reflect green light, and the dichroic film of the transmissive region may transmit green light; the dichroic film of the reflection area in the first light combining lens in the second light combining lens group 103b can transmit green light and reflect blue light, and the dichroic film of the transmission area can transmit green light and blue light.

In a second alternative implementation manner, the ith light combining lens in the second light combining lens group includes a light-transmitting substrate and a light-reflecting coating layer located on the light-transmitting substrate. The reflection area in the ith light combining lens comprises an area provided with a reflective coating in the ith light combining lens, the reflective coating is used for reflecting second laser emitted by the corresponding second light emitting area, and the transmission area in the ith light combining lens comprises an area which is not provided with the reflective coating in the ith light combining lens. Therefore, the reflection of the incident second laser light by the reflection area and the transmission of the incident second laser light by the transmission area in the ith light combining lens are realized. In one embodiment, the reflective coating can reflect the full wavelength range of light when the reflective region in the ith light combining lens does not need to transmit laser light of any wavelength range. When the reflection region in the ith light combining lens needs to transmit laser light in a certain waveband, the reflective coating can have the function of transmitting the laser light in the waveband, and the function of the reflective coating is similar to that of the dichroic film.

In a third optional implementation manner, the ith light combining lens in the second light combining lens group includes a plurality of sub-lenses, each reflective area of the ith light combining lens includes one sub-lens, and no material may be disposed in the transmissive area of the ith light combining lens. The formation of the sub-lens can refer to the formation of the reflection area in the first and second alternative implementations.

In the second alternative implementation and the third alternative implementation, the transmissive region may transmit light of all wavelength bands, and the reflective region may reflect light of all wavelength bands. In one embodiment, if the light source module includes a plurality of second combined optical lens groups in the two modes, the transmissive areas and the reflective areas in the plurality of second combined optical lens groups may be designed in the above-mentioned insertion-space arrangement mode. Therefore, light reflected by the reflecting area in one second light combining lens group can shoot to the light outlet through the transmission area in other second light combining lens groups, so that dichroic films do not need to be arranged in the transmission area, and the problems that the preparation cost is increased and the preparation process is complicated due to the fact that the dichroic films need to be arranged at all positions of the light combining lenses of other second light combining lens groups can be solved. In addition, as for the third alternative implementation mode, any material does not need to be arranged in the transmission region, so that the manufacturing cost of the light source component can be further saved.

In one embodiment, for the mth light combining lens in the second light combining lens group: one implementation of the function of the mth light combining lens may refer to the first optional implementation of the ith light combining lens. In another implementation manner, if a certain second light combining lens group is a light combining lens group farthest from the light exit in the light source assembly, the mth light combining lens in the second light combining lens group may be a light reflecting sheet, and the light reflecting sheet may reflect light of all bands, for example, the light reflecting sheet may be a metal sheet (e.g., an aluminum sheet or a copper sheet). Alternatively, the structure of the mth light combining lens may refer to the second optional implementation manner of the ith light combining lens.

For the implementation of the functions of the light combining lenses in the first light combining lens group, reference may be made to the above-mentioned first optional implementation of the ith light combining lens. The dichroic film of the light combining lens in the first light combining lens group in fig. 2 can be used to transmit green light and blue light and reflect red light.

Fig. 8 is a schematic structural diagram of another light source module according to an embodiment of the present disclosure. As shown in fig. 8, the light source assembly 10 may further include: a housing 104. The laser 101, the first light combining lens group 102 and the second light combining lens group 103 may all be disposed in an accommodating cavity inside the housing 104.

In one embodiment, the light source assembly 10 may further include a phase retarder 105, and the phase retarder 105 may be located on the light emitting side of the second light emitting region of the laser and located between the second light emitting region and the second combined optical lens group 103. The second laser light (such as green laser light or blue laser light) emitted by the second light emitting region may be directed to the second light combining lens set 103 after the polarization direction of the second laser light is adjusted by the phase retarder 105. Since the polarization directions of the laser light emitted from the first light-emitting region and the second light-emitting region are generally different, the phase retarder 105 may be disposed on the light-emitting side of the second light-emitting region such that the polarization direction of the second laser light passing through the phase retarder 105 is the same as the polarization direction of the first laser light (e.g., red laser light). In one embodiment, the retardation plate 105 may be fixed inside the housing 104 by clamping with a clamping member, so as to avoid the fixing device of the retardation plate 105 from blocking the optical path. Such as the phase retarder 105 may be a half-wave plate. In one embodiment, the light emitting region emitting green laser light is adjacent to the light emitting region emitting blue laser light, so that only one half-wave plate can be disposed in the light source assembly 10 to adjust the phases of the green laser light and the blue laser light.

In this application embodiment, an integrated base may be further disposed in the accommodating cavity of the housing 104, and each light combining lens group may be fixed by the integrated base, so as to reduce the cumulative tolerance of a plurality of structural assemblies, and facilitate to maintain the same setting angle and the relative position relationship between each light combining lens. In one implementation, the retarder 105 may also be secured by an integral base.

In one implementation, the light source assembly 10 may also include a converging lens 106. The condensing lens 106 may be located at the light exit K of the light source assembly 10. The laser beams emitted from each light emitting region of the laser 101 may be reflected by the corresponding light combining lens group, and then mixed into a beam of laser beams, which is emitted to the converging lens 106 at the light outlet K of the light source assembly 10. The converging lens 106 may converge the received light to reduce the spot and direct the light to the optical engine, such as to a light path shaping component in the optical engine, such as a light path shaping component including a light pipe for homogenizing the light. The laser light of different colors emitted by the light emitting regions of the laser 10 can be mixed to obtain white light, and a white spot can be formed at the converging lens 106. In addition, due to the arrangement of the second light combining lens group in the embodiment of the present application, the size difference of the light spots formed by the laser light of each color on the converging lens 106 is small, so that the uniformity of the white light spots formed on the converging lens 106 is high.

In one embodiment, the light source module 10 may further include a diffusing part (not shown in fig. 8), which may be located on the light-emitting path of the converging lens 106, and the laser light emitted from the light-emitting port is diffused by the diffusing part and then enters the beam shaping part. The diffusion part may be a diffusion wheel structure including a rotating diffusion sheet. The diffusion sheet is used for rotatably diffusing the light rays, so that the light rays can be eliminated, the quality of the light rays emitted by the light source assembly is improved, and the speckle effect of a projected image is reduced.

In summary, in the light source module provided in the embodiment of the present application, the second light combining lens group is located at the light emitting side of the second light emitting area of the laser, and a plurality of light combining lenses in the second light combining lens group are arranged along the light emitting direction of the second light emitting area and a gap is formed between two adjacent light combining lenses. The light combining lens in front of the last light combining lens in the second light combining lens group comprises a transmission area and a reflection area, the second laser light emitted to the reflection area can be directly reflected to the light outlet by the reflection area, the second laser light emitted to the transmission area can pass through the transmission area to be emitted to the next light combining lens, and the second laser light emitted to the last light combining lens can be reflected to the light outlet. Therefore, the second laser light emitted by the second light emitting region of the laser can be emitted to the light outlet from the plurality of light combining lenses with gaps between the plurality of light combining lenses, the second laser light emitted to the light outlet can cover a larger range, and a light spot formed by the second laser light at the light outlet can be larger. Even if the divergence angle of the first laser emitted by the first light emitting area is large, so that the light spot formed by the first laser at the light outlet is large, the size difference between the light spot formed by the second laser and the light spot formed by the first laser can be small through the plurality of light combining lenses in the second light combining lens group, and the uniformity of the laser obtained by mixing the first laser and the second laser at the light outlet is high.

Fig. 9 is a schematic structural diagram of a projection apparatus according to an embodiment of the present application. As shown in fig. 9, the projection apparatus may include: light source assembly 10, optical engine 20 and lens 30. The light source assembly 10 is configured to emit light to the optical machine 20, the optical machine 20 is configured to modulate the incident light and emit the modulated light to the lens 30, and the lens 30 is configured to project the incident light. The light source assembly may be any of the light source assemblies 10 described above. Because the uniformity of the laser emitted by the light source assembly 10 is high, the projection device using the light source assembly can form a projection picture with a good display effect according to the laser with high uniformity.

In one implementation, the optical engine may include a light homogenizing component, a lens set, a Total Internal Reflection (TIR) prism set, and a light modulating component. The light emitted from the light source assembly is emitted to the lens after the light homogenizing component, the lens group, the Total Internal Reflection (TIR) prism group and the light modulation component are carried out in sequence. The light emergent surface passing through the light homogenizing component and the light incident surface of the light modulation device are in conjugate object-image relationship. The light modulation component may be a Silicon-based Liquid Crystal On Silicon (LCOS), a Liquid Crystal Display (LCD), or a Digital Micromirror Device (DMD).

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 associated objects are in an "or" relationship. The term "at least one of a, B and C" in this application means that there may be seven relationships that may mean: there are seven cases of A alone, B alone, C alone, A and B together, A and C together, C and B together, and A, B and C together. 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 (10)

1. A light source assembly, characterized in that it comprises:

   a laser having a first light emitting region and a second light emitting region; the first light emitting area is used for emitting first laser light, the second light emitting area is used for emitting second laser light, and the divergence angle of the first laser light is larger than that of the second laser light;

   the first light combining lens group is positioned on the light emitting side of the first light emitting area and used for reflecting the first laser emitted by the first light emitting area to the light outlet of the light source component;

   the second light combining lens group is positioned on the light emitting side of the second light emitting area; the second light combining lens group comprises m light combining lenses which are sequentially arranged along the light emitting direction of the second light emitting area, a gap is formed between the ith light combining lens and the (i + 1) th light combining lens in the m light combining lenses, m is more than or equal to 2, i is more than or equal to 1 and less than or equal to m-1; the ith light combining lens comprises a reflection area and a transmission area, the reflection area is used for reflecting the second laser light which enters the ith light combining lens to the light outlet, and the transmission area is used for transmitting the second laser light which enters the ith light combining lens to the (i + 1) th light combining lens; the mth light combining lens is used for reflecting the second laser to the light outlet.
2. The light source assembly of claim 1, wherein a first one of the m light combining lenses comprises a plurality of the reflective regions and a plurality of the transmissive regions, the reflective regions alternating with the transmissive regions.
3. The light source assembly of claim 1, wherein m ≧ 3;

   the j-th light combining lens in the m light combining lenses is provided with a first transmission area, the j + 1-th light combining lens is provided with a second transmission area corresponding to the first transmission area, and j is more than or equal to 1 and less than m-1; on the second light-emitting region, the orthographic projection of the first transmission region is at least partially overlapped with the orthographic projection of the second transmission region corresponding to the first transmission region;

   the first transmission region is used for transmitting at least part of the second laser to the second transmission region corresponding to the first transmission region.
4. The light source module as claimed in claim 1, wherein the first light combining lens group, the second light combining lens group and the light outlet are arranged in a target direction, and the target direction intersects with the light outlet direction of the laser;

   the light combining lens group positioned between the light outlet and any light combining lens group is also used for: and the laser emitted by any light combining lens group is transmitted.
5. The light source module as recited in claim 4, wherein the light source module comprises a plurality of the second light-emitting areas and a plurality of the second combined optical lens groups; each second light combining lens group corresponds to one second light emitting area, different second light combining lens groups correspond to different second light emitting areas, and each second light combining lens group is located at the light emitting side of the corresponding second light emitting area;

   for any two of the second light combining lens groups: on a plane perpendicular to the target direction, the orthographic projection of the target reflection area and the orthographic projection of the target transmission area are at least partially overlapped;

   the target reflection area belongs to a light combining lens of the second light combining lens group far away from the light outlet, and the target transmission area belongs to a light combining lens of the second light combining lens group close to the light outlet; the target reflection zone is configured to: reflecting the second laser to the target transmission area, so that the second laser is emitted to the light outlet through the target transmission area.
6. The light source assembly according to any one of claims 1 to 5, wherein the ith light combining lens comprises a light-transmitting substrate and a light-reflecting coating layer on the light-transmitting substrate, the reflective region comprises an area of the ith light combining lens where the light-reflecting coating layer is disposed, and the transmissive region comprises an area of the ith light combining lens where the light-reflecting coating layer is not disposed.
7. The light source assembly according to any one of claims 1 to 5, wherein the ith light combining lens comprises: a light-transmissive substrate and a dichroic film attached to the light-transmissive substrate; the dichroic film of the transmission region is used for transmitting the incident second laser light, and the dichroic film of the reflection region is used for reflecting the incident second laser light.
8. The light source module according to any one of claims 1 to 5, wherein the light combining lens set farthest from the light exit port in the light source module is the second light combining lens set, and the mth light combining lens in the light combining lens set farthest from the light exit port is a reflector.
9. The light source assembly according to any one of claims 1 to 5, wherein the m light-combining mirrors are parallel.
10. A projection device, characterized in that the projection device comprises: the light source module of any one of claims 1 to 9, and an opto-mechanical and lens;

    the light source assembly is used for emitting light to the ray machine, the ray machine is used for converging the light that the light source assembly sent to the camera lens, the camera lens is used for projecting the light after the ray machine converges.

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