Laser, light source apparatus and laser projection device

Abstract

A laser (800), a light source apparatus (10) and a laser projection device, belonging to the field of laser display. The laser (800) comprises: a light-emitting chip (801), a reflecting prism (802) and a collimating lens (803). The light-emitting chip (801) is used for emitting laser light in a third direction (Z), the angle of divergence of the laser light in a first direction (X) being smaller than the angle of divergence of the laser light in a second direction (Y), and the first direction (X), the second direction (Y) and the third direction (Z) being perpendicular to each other. The reflecting prism (802) has a reflecting surface (SR), the reflecting surface (SR) being located on a light-emitting side of the light-emitting chip (801). The collimating lens (803) has a light incident surface (S1) and a light-emitting surface (S2), the reflecting prism (802) being used for reflecting the laser light to the light incident surface (S1) of the collimating lens (803). At least one of the reflecting surface (SR) and the light incident surface (S1) is a target curved surface, the target curved surface being used for reducing the difference between the angle of divergence of the laser light in the first direction (X) and the angle of divergence of the laser light in the second direction (Y). Adjusting the angles of divergence of the laser light in the first direction (X) and in the second direction (Y) renders energy distribution uniform, improving the display effect of projected pictures.

Description

Lasers, light source devices and laser projection equipment

[0001] This application claims priority to Chinese Patent Application No. 202410683623.7, filed on May 29, 2024, entitled "Laser and Display Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to laser display technology. More specifically, it relates to a laser, a light source device, and a laser projection device. Background Technology

[0003] Laser light sources have advantages such as good monochromaticity, high brightness, and long lifespan, making them a relatively ideal light source. In recent years, laser light sources have also been increasingly used in laser projection equipment.

[0004] In some related technologies, laser projection equipment may include a laser and a subsequent optical system. The laser may include components such as a light-emitting chip, a reflecting prism, and a collimating lens. The laser emitted from the light-emitting chip is reflected by the reflecting prism to the collimating lens, and then collimated before being emitted again.

[0005] Because collimating lenses are typically designed to collimate the fast axis with a larger diffusion angle, and because of the shape of the light-emitting point of the light-emitting chip and the difference in the angles of the fast and slow axes of the laser, the light spot emitted after collimation of a single light-emitting point of the laser is a thin ellipse. This results in uneven distribution of light spot energy in the fast and slow axis directions, leading to poor display quality of the projected image. Summary of the Invention

[0006] This application provides a laser and a display device that can solve the problem in the related art where the laser emitted by the laser has an elliptical spot, resulting in uneven distribution of spot energy along the fast and slow axes, leading to poor display effect of the projected image.

[0007] In a first aspect, embodiments of this application provide a laser, the laser comprising: a light-emitting chip, a reflecting prism, and a collimating lens;

[0008] The light-emitting chip is used to emit laser light along a third direction. The diffusion angle of the laser light in the first direction is smaller than the diffusion angle of the laser light in the second direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0009] The reflecting prism has a reflecting surface, which is located on the light-emitting side of the light-emitting chip;

[0010] The collimating lens has an incident surface and an exit surface, and the reflecting prism is used to reflect the laser light to the incident surface of the collimating lens;

[0011] Wherein, at least one of the reflecting surface and the incident surface is a target curved surface, and the target curved surface is used to reduce the difference between the diffusion angle of the laser in the first direction and the diffusion angle of the laser in the second direction.

[0012] Secondly, this application provides a light source device, which includes a laser, a light combining component, and a lens component, wherein the laser is the laser described above.

[0013] Thirdly, this application provides a laser projection device, which includes: a light source device as described above, as well as a light modulation component and a projection lens;

[0014] The light modulation component is located on the light-emitting side of the light source device, and the light modulation component is used to modulate the light emitted from the light source device;

[0015] The projection lens is located on the light-emitting side of the light modulation component. Attached Figure Description

[0016] To more clearly illustrate the implementation methods in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 is a schematic diagram of the structure of a laser.

[0018] Figure 2 is a schematic diagram of the structure of a laser.

[0019] Figure 3 is a schematic diagram of the internal structure of a laser;

[0020] Figure 4 is a top view of the internal structure of a laser;

[0021] Figure 5 is a schematic diagram of the laser collimation process in the fast axis direction in a related technology;

[0022] Figure 6 is a schematic diagram of the laser collimation process in the slow axis direction in a related technology;

[0023] Figure 7 is a schematic diagram of the shape of the collimated light spot in a related technology;

[0024] Figure 8 is a schematic diagram of a laser provided in an embodiment of this application;

[0025] Figure 9 is a schematic diagram of the structure of a reflecting prism provided in an embodiment of this application;

[0026] Figure 10 is a schematic diagram of the structure of a reflecting prism provided in an embodiment of this application;

[0027] Figure 11 is a schematic diagram of the structure of a reflective prism provided in an embodiment of this application;

[0028] Figure 12 is a schematic diagram of a circular light spot provided in an embodiment of this application;

[0029] Figure 13 is a schematic diagram of the structure of a laser provided in an embodiment of this application;

[0030] Figure 14 is a schematic diagram of a collimating lens provided in an embodiment of this application;

[0031] Figure 15 is a schematic diagram of a collimating lens provided in an embodiment of this application;

[0032] Figure 16 is a schematic diagram of the structure of a collimating lens provided in an embodiment of this application;

[0033] Figure 17 is a schematic diagram of the structure of a collimating lens provided in an embodiment of this application;

[0034] Figure 18 is a schematic diagram of the structure of a collimating lens provided in an embodiment of this application;

[0035] Figure 19 is a schematic diagram of a partial structure of a laser provided in an embodiment of this application;

[0036] Figure 20 is a schematic diagram of the laser collimation process in the fast axis direction provided in an embodiment of this application;

[0037] Figure 21 is a schematic diagram of the laser collimation process in the slow axis direction provided in an embodiment of this application;

[0038] Figure 22 is a schematic diagram of the structure of a laser projection device provided in an embodiment of this application. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0040] Laser light sources have advantages such as good monochromaticity, high brightness, and long lifespan, making them a relatively ideal light source. With the increasing power of laser devices to meet the requirements of industrial applications, lasers are increasingly being used as lighting sources.

[0041] In recent years, lasers have been used as projection light sources in projection equipment, gradually replacing mercury lamps. Compared with LED light sources, lasers have also been more widely used due to their advantages such as smaller optical extension and higher brightness.

[0042] Figure 1 is a schematic diagram of a laser structure (one type), and Figure 2 is a schematic diagram of a laser structure (two types). Referring to Figures 1 and 2, the base plate 101 can be used to weld the housing 102, and a printed circuit board can be printed inside the base plate 101 to achieve circuit interconnection with the housing 102.

[0043] The casing 102 can be fixed to the base plate 101 using a tin-silver-copper alloy via reflow soldering. However, the soldering method is not limited to reflow soldering; other methods, such as high-temperature pressure sintering of silver or copper paste, can also be used for fixing. The base plate 101 can be made of oxygen-free copper, diamond copper, or other metallic materials.

[0044] Figure 3 is a schematic diagram of the internal structure of a laser, and Figure 4 is a top view of the internal structure of a laser. Referring to Figures 3 and 4, the sidewall of the tube shell is 1021 as shown in Figure 3, and the step on the sidewall of the tube shell is 1022 as shown in Figures 3 and 4.

[0045] The light-emitting unit 105 includes a heat sink and a light-emitting chip, which is soldered onto the heat sink using a eutectic process. The heat sink is primarily made of materials such as AlN (aluminum nitride) and SiC (silicon carbide), which are not shown in Figures 1 to 4. The waveguide dimension in the vertical direction of the light-emitting unit 105 is relatively small, resulting in a beam quality close to the diffraction limit while also producing a large divergence angle; therefore, this direction is defined as the fast axis. Depending on the waveguide layer size along the fast axis, the beam divergence angle ranges from 40° to 60°. The horizontal direction (x-axis) of the light-emitting unit 105 is the slow axis, with the active region typically ranging from 100 μm to 500 μm in size, exhibiting a divergence angle ranging from 6° to 15°, and resulting in poorer beam quality.

[0046] The light beam emitted from the light-emitting unit 105 is incident on the reflector 106, which reflects the beam back at a 90° angle. The reflector 106 can be made of materials such as borosilicate glass, quartz, or silicon, and its surface is coated with an anti-reflection film to improve reflectivity. Because the light beam emitted from the light-emitting unit 105 has a large diffusion angle in the fast axis direction, the reflector 106 can only reflect most of the light beam emitted from the light-emitting unit 105. The remaining portion of the beam does not form effective light but instead exits from the side of the reflector 106, forming stray beams.

[0047] The cover plate 103 is mainly used to achieve the airtightness of the shell 102. The material of the cover plate 103 can generally be high-strength sapphire or glass, etc. A metal layer is set around the perimeter of the cover plate 103, with the rest being a light-transmitting area. The metal layer is bonded to the solder to achieve a high airtightness level. Alloy solder needs to be added to the metal layer around the cover plate 103 to weld the cover plate 103 to the shell 102, thereby achieving airtightness. The thickness of the solder layer is related to the surface smoothness of the welding area of ​​the shell 102. The alloy solder melts above its melting point and fills the welding area. If the thickness of the alloy solder is less than the surface smoothness of the welding area of ​​the shell 102, the solder cannot completely fill the welding area, resulting in poor airtightness.

[0048] Lens 104 is mainly used to control the divergence angle of the light beam emitted from the light-emitting unit 105. Therefore, lens 104 needs to be designed and optimized for the divergence angle of the light beam and the optical path parameters of the light-emitting device. Thus, the curvature of lens 104 can be optimized for the different characteristics of each light-emitting unit 105, or the lens can be optimized to have the same curvature based on ease of manufacturing and cost. The surface shape of lens 104 can be optimized to be aspherical, freeform, etc., or a Fresnel structure can be used to achieve the function of compressing the divergence angle.

[0049] In addition to the aforementioned devices, the laser may also include components such as the solder sheet 108 shown in Figure 2.

[0050] Figure 5 is a schematic diagram of the laser collimation process along the fast axis in a related technology, and Figure 6 is a schematic diagram of the laser collimation process along the slow axis in a related technology. Referring to Figures 5 and 6, the laser 500 includes a light-emitting chip 501, a reflecting prism 502, a sealing glass 503, and a collimating lens 504. The laser emitted from the light-emitting chip 501 is reflected by the reflecting prism 502 and then incident on the collimating lens 504, where it is collimated before exiting.

[0051] Among them, the reflecting prism 502 is the reflecting mirror shown in Figures 2 to 4, the sealing glass 503 is the cover plate in Figures 1 to 2, and the collimating lens 504 is the lens in Figures 1 to 2.

[0052] Typically, light-emitting chips are semiconductor laser elements. The laser emitted from the light-emitting chip forms an elliptical far-field pattern (hereinafter referred to as FTP) on a surface parallel to the laser emission surface. FTP is the shape or intensity distribution of the emitted light at a position far from the emission surface.

[0053] The shape of the laser FTP emitted from the light-emitting chip is an ellipse on a plane parallel to the light emission surface, where the stacking direction is longer than the direction perpendicular to the stacking direction. The stacking direction refers to the direction in which multiple semiconductor layers containing the active layer are stacked in the light-emitting chip. The direction perpendicular to the stacking direction can also be called the planar direction of the semiconductor layer. Furthermore, the major axis of the elliptical shape of the FTP can be called the fast axis direction of the light-emitting chip, and the minor axis direction can be called the slow axis direction. Figure 7 is a schematic diagram of the collimated light spot shape in a related technology, where the X-axis represents the slow axis direction and the Y-axis represents the fast axis direction.

[0054] The light intensity distribution based on FTP, 1 / e of the peak light intensity 2 The angle at which light diffuses, denoted by the peak light intensity, is defined as the light diffusion angle. The light diffusion angle is calculated by dividing the peak light intensity by 1 / e. 2 Besides determining the light intensity based on the peak light intensity, there are also cases where the light intensity is determined based on half the peak light intensity. In this application's specification, only when referred to as the "light diffusion angle" does it refer to 1 / e of the peak light intensity. 2 The light intensity is the diffusion angle of the light. It should be noted that the diffusion angle along the fast axis can be considered larger than the diffusion angle along the slow axis.

[0055] Because the diffusion angle in the fast axis direction is greater than the diffusion angle in the slow axis direction, the energy distribution of the light spot is not consistent in the fast and slow axis directions. The shape of the light spot is approximately a long and thin ellipse. When it is shaped by the optical device, the changes in each direction are inconsistent, resulting in a poor display effect of the projected image.

[0056] Meanwhile, since collimating lenses are usually designed for the fast-axis divergence angle, they collimate only the laser beam in the fast-axis direction, or collimate the laser beam in the fast-axis direction to a greater extent, while collimating the laser beam in the slow-axis direction to a lesser extent. As a result, after collimation, the laser beam in the fast-axis direction can be converted into collimated light, while the beam in the slow-axis direction continues to diverge. This makes the divergence angle of the beam in the slow-axis direction greater than that in the fast-axis direction, and the energy distribution is still uneven. This also makes the design of subsequent optical systems more difficult and easily leads to efficiency loss.

[0057] Based on this, this application provides a laser, a light source device, and a laser projection device. For the laser, at least one of the reflecting surface of the reflecting prism and the incident surface of the collimating lens can be used as the target surface. The target surface is used to reduce the difference between the laser's diffusion angle in the slow axis direction and the laser's diffusion angle in the fast axis direction, thereby improving the consistency between the laser size in the fast axis direction and the laser size in the slow axis direction, resulting in a circular or nearly circular light spot. By adjusting the size of the light spot in both directions, the energy distribution is made uniform, improving the uniformity of the laser spot array and thus enhancing the display effect of the projected image.

[0058] Meanwhile, to ensure that the diffusion angles of the collimated laser beam in the fast axis and slow axis directions are similar, a collimating lens can be used to collimate not only the laser beam in the fast axis direction but also the laser beam in the slow axis direction. Since both the fast and slow axis laser beams are collimated, the diffusion angles in the two directions are closer, improving the uniformity of energy distribution, reducing the design complexity of subsequent optical systems, and effectively avoiding efficiency reduction.

[0059] The technical solution of this application will be described in detail below with reference to specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0060] Figure 8 is a schematic diagram of a laser provided in an embodiment of this application. Referring to Figure 8, the laser 800 includes: a light-emitting chip 801, a reflecting prism 802, and a collimating lens 803.

[0061] The light-emitting chip 801 is used to emit laser light along a third direction. The diffusion angle of the laser light in the first direction is smaller than the diffusion angle of the laser light in the second direction. The first direction is perpendicular to the second direction, and both the first and second directions are perpendicular to the third direction.

[0062] The reflecting prism 802 has a reflecting surface S R Reflecting surface S R Located on the light-emitting side of the light-emitting chip 801;

[0063] The collimating lens 803 has an incident surface S1 and an exit surface S2, and the reflecting prism 802 is used to reflect the laser light to the incident surface S1 of the collimating lens 803.

[0064] Among them, during laser transmission, the reflecting surface S R At least one of the incident light surface S1 is a target surface, which is used to reduce the difference between the laser diffusion angle in the first direction and the laser diffusion angle in the second direction.

[0065] This application reduces the difference between the laser diffusion angle in the first direction and the laser diffusion angle in the second direction by using a target curved surface, thereby improving the consistency of the laser size in both directions and obtaining a circular or near-circular light spot. When the laser 800 is applied in a laser projection device, it helps to improve the display effect of the projected image.

[0066] In some embodiments, the laser 800 may include a plurality of light-emitting chips 801, which may include at least one type of chip: a light-emitting chip that emits blue laser light, a light-emitting chip that emits green laser light, a light-emitting chip that emits red laser light, etc. This application does not limit the specific type of chip.

[0067] The reflecting prism 802 corresponds one-to-one with the light-emitting chip 801, and the collimating lens 803 corresponds one-to-one with the reflecting prism 802. The specific structure can be referred to the structure of the laser shown in Figures 1 to 4 above, and will not be described in detail here.

[0068] Referring to Figure 8, the light-emitting chip 801 emits laser light along a third direction, which is the direction of the Z-axis shown in Figure 8. Since the diffusion angle of the laser in the first direction is smaller than that in the second direction, the first direction can be the slow axis direction, and the second direction is the fast axis direction. Again referring to Figure 8, the slow axis direction corresponds to the X-axis shown in Figure 8, and the fast axis direction corresponds to the Y-axis shown in Figure 8. The reflecting surface S of the reflecting prism 802... R The surface formed by ABCD in Figure 8 is located on the side closest to the light-emitting chip 801.

[0069] Figure 9 is a schematic diagram of a reflective prism provided in an embodiment of this application. Figure 10 is a schematic diagram of a reflective prism provided in an embodiment of this application. Figure 11 is a schematic diagram of a reflective prism provided in an embodiment of this application.

[0070] The reflecting surface S of the reflecting prism 802 R At least one of the incident surface S1 of the collimating lens 803 can be used as the target surface.

[0071] Referring to Figures 9 to 11, in one implementation scenario, when the target curved surface only includes the reflecting surface S of the reflecting prism 802... R At that time, the reflecting surface S R Having a first curvature about a first axis Z1, and / or, a reflecting surface S R It has a second curvature about the second axis Z2.

[0072] Among them, the first axis Z1 is parallel to the second direction, and the second axis Z2 is parallel to the first direction.

[0073] In some feasible implementations, the reflecting surface S R Used to increase the diffusion angle of the laser in the first direction, and / or, the reflecting surface S R Used to reduce the spread angle of the laser in the second direction.

[0074] The reflecting surface S R By targeting the curved surface, the diffusion angle of the laser in the slow axis direction was increased, thus achieving beam expansion of the laser in the slow axis direction, which means that the laser beam can be expanded through the reflecting surface S. R The spread angle of the reflected beam along the slow axis is greater than that at the reflecting surface S. R The beam spreads at the slow axis, and / or reduces the spread angle of the laser beam at the fast axis, thus achieving beam contraction in the fast axis direction, which is achieved by the reflection surface S.R The spread angle of the reflected beam along the fast axis is smaller than that at the reflecting surface S. R The spread angle of the beam in the second direction.

[0075] Since the target surface does not include the incident surface S1 of the collimating lens 803 at this time, the incident surface S1 is a plane.

[0076] Because the laser beam along the slow axis passes through the reflecting surface S R This means that beam expansion is completed, and / or, the laser beam along the fast axis passes through the reflecting surface S. R The beam is narrowed, so the light spot that the laser irradiates the incident surface S1 of the collimating lens 803 is a circular or nearly circular light spot, which improves the uniformity of the light spot energy distribution. For details, please refer to Figure 12, which is a schematic diagram of a circular light spot provided in an embodiment of this application.

[0077] Referring to Figure 9, specifically, in one feasible implementation, the reflecting surface S R Having only the first curvature, and the reflecting surface S R This is the first convex curved surface. Reflecting surface S R This is used to increase the diffusion angle of the laser in the first direction. At this time, the first axis Z1 is located at the reflecting surface S. R The side facing away from the light-emitting chip 801.

[0078] Due to the reflecting surface S R It has a first curvature about the first axis Z1, and the reflecting surface S R Since it is the first convex surface, the reflecting surface S R It can increase the diffusion angle of the laser in the slow axis direction, thereby expanding the laser beam in the slow axis direction.

[0079] Due to the reflecting surface S R The reflecting surface S has only the first curvature and not the second curvature. R The intersection with the first plane is a convex curve, and the intersection with the second plane is a straight line.

[0080] The first plane is the plane formed by the slow axis direction and the optical axis of the laser, and the second plane is the plane formed by the fast axis direction and the optical axis of the laser.

[0081] Reflecting surface S R This refers to the surface formed by ABCD, where the slow axis corresponds to the X-axis, the fast axis corresponds to the Y-axis, and the laser's optical axis corresponds to the Z-axis. The first plane is the plane formed by the X-axis and Z-axis, and the second plane is the plane formed by the Y-axis and Z-axis.

[0082] Reflecting surface S R The lines of intersection with the first plane are lines C and D shown in Figure 9, as well as a line parallel to either line C or D. Since the reflecting surface S...R The intersection with the first plane is a convex curve; therefore, lines C and D, as well as lines parallel to C or D, are convex curves. At this time, laser light incident along the slow axis illuminates the reflecting surface S. R Reflecting surface S R It can diverge laser light in the slow axis direction, expand the beam, and reflect it to the incident surface S1.

[0083] Meanwhile, the reflecting surface S R The lines of intersection with the second plane are lines A and B shown in Figure 9, as well as a line parallel to either line A or B. Since the reflecting surface S... R The intersection with the second plane is a straight line; therefore, lines A and B, as well as lines parallel to either A or B, are straight lines. At this point, the laser beam incident along the fast axis illuminates the reflecting surface S. R Reflecting surface S R Only the laser beam in the fast axis direction is reflected to the incident surface S1, without diverging or converging the laser beam in the fast axis direction.

[0084] Since lines A and B are both straight lines, and lines C and D are both curves, therefore the reflecting surface S... R Let be a cylindrical surface. A cylindrical surface is a curved surface formed by moving a straight line parallel to a fixed curve.

[0085] Referring to Figure 10, specifically, in another feasible implementation, the reflecting surface S R It has only the second curvature, and the reflecting surface S R This is the first concave curved surface. Reflecting surface S R This is used to reduce the laser's diffusion angle in the second direction. At this time, the second axis Z2 is located at the reflecting surface S. R The side facing the light-emitting chip 801.

[0086] Due to the reflecting surface S R It has a second curvature about the second axis Z2, and the reflecting surface S R Since it is the first concave surface, the reflecting surface S R It can reduce the diffusion angle of the laser in the fast axis direction, thus achieving beam contraction of the laser in the fast axis direction.

[0087] Due to the reflecting surface S R The reflecting surface S has only the second curvature and not the first curvature. R The intersection with the first plane is a straight line, and the intersection with the second plane is a concave curve.

[0088] Reflecting surface S R The lines of intersection with the first plane are lines C and D shown in Figure 10, as well as a line parallel to either line C or D. Since the reflecting surface S... RThe intersection with the first plane is a straight line, therefore lines C and D, as well as lines parallel to C or D, are straight lines. At this time, the laser light incident along the slow axis illuminates the reflecting surface S. R Reflecting surface S R Only the laser beam in the slow axis direction is reflected to the incident surface S1, without diverging or converging the laser beam in the slow axis direction.

[0089] Meanwhile, the reflecting surface S R The lines of intersection with the second plane are lines A and B shown in Figure 10, and a line parallel to either line A or B. Since the reflecting surface S... R The intersection with the second plane is a concave curve; therefore, lines A and B, as well as lines parallel to A or B, are concave curves. In this case, the laser beam incident along the fast axis illuminates the reflecting surface S. R Reflecting surface S R It can focus the laser beam along the fast axis, reduce the beam size, and reflect it to the incident surface S1.

[0090] Since lines A and B are both curves, and lines C and D are both straight lines, the reflecting surface S... R It is also a cylindrical surface.

[0091] Referring to Figure 11, specifically, in another feasible implementation, the reflecting surface S R It simultaneously possesses a first curvature and a second curvature, with the first axis located at the reflecting surface S. R On the side opposite to the light-emitting chip 801, the second axis is located on the reflective surface S. R The side facing the light-emitting chip 801. Reflective surface S R It is used to increase the diffusion angle of the laser in the first direction and to decrease the diffusion angle of the laser in the second direction.

[0092] Due to the reflecting surface S R It simultaneously possesses a first curvature and a second curvature, and the first axis is located on the reflecting surface S. R On the side opposite to the light-emitting chip 801, the second axis is located on the reflective surface S. R The side facing the light-emitting chip 801, therefore, the reflective surface S R It can both increase the diffusion angle of the laser in the first direction and decrease the diffusion angle of the laser in the second direction, that is, increase the diffusion angle of the laser in the slow axis direction and decrease the diffusion angle of the laser in the fast axis direction.

[0093] Due to the reflecting surface S R It simultaneously possesses a first curvature and a second curvature, and the first axis is located on the reflecting surface S. R On the side opposite to the light-emitting chip 801, the second axis is located on the reflective surface S. R On the side facing the light-emitting chip 801, the reflective surface S RThe intersection with the first plane is a convex curve, and the intersection with the second plane is a concave curve.

[0094] Reflecting surface S R The lines of intersection with the first plane are lines C and D shown in Figure 11, as well as a line parallel to either line C or D. Since the reflecting surface S... R The intersection with the first plane is a convex curve; therefore, lines C and D, as well as lines parallel to C or D, are convex curves. At this time, laser light incident along the slow axis illuminates the reflecting surface S. R Reflecting surface S R It can diverge laser light in the slow axis direction, expand the beam, and reflect it to the incident surface S1.

[0095] Meanwhile, the reflecting surface S R The intersection with the second plane is shown in Figure 11 as lines A and B, and a line parallel to either line A or B. Since the reflecting surface S... R The intersection with the second plane is a concave curve; therefore, lines A and B, as well as lines parallel to A or B, are concave curves. In this case, the laser beam incident along the fast axis illuminates the reflecting surface S. R Reflecting surface S R It can focus the laser beam along the fast axis, achieve beam contraction, and reflect it to the incident surface S1.

[0096] Since lines A and B are both curves, and lines C and D are also curves, therefore the reflecting surface S... R The curved surface is not a cylindrical surface.

[0097] In summary, by considering the reflecting surface S of the reflecting prism 802... R The laser beam is configured to expand in the slow axis direction to increase its size in that direction, and / or contract in the fast axis direction to decrease its size in that direction. This reduces the size difference between the slow and fast axes, making the laser size in the slow and fast axes equal or within a preset range. This improves the consistency of the laser size in both directions, resulting in a circular or near-circular spot. This ensures uniform energy distribution and effectively improves the uniformity of the laser spot array, thereby enhancing the display effect of the projected image.

[0098] In some feasible implementations, the laser 800 may further include a sealing glass 804, which is located between the reflecting prism 802 and the collimating lens 803, forming a sealed space with the housing in the laser. For details, please refer to Figure 13, which is a schematic diagram of the structure of a laser provided in an embodiment of this application.

[0099] Figure 14 is a schematic diagram of a collimating lens according to an embodiment of this application (I), Figure 15 is a schematic diagram of a collimating lens according to an embodiment of this application (II), and Figure 16 is a schematic diagram of a collimating lens according to an embodiment of this application (III).

[0100] Referring to Figures 14 to 16, in one implementation scenario, when the target surface only includes the light-incident surface S1 of the collimating lens 803, the light-incident surface S1 has a third curvature about the third axis, and / or, the light-incident surface S1 has a fourth curvature about the fourth axis.

[0101] Among them, the third axis is parallel to the second direction, and the fourth axis is parallel to the first direction.

[0102] In some feasible implementations, the incident surface S1 is used to increase the diffusion angle of the laser in the first direction, and / or the incident surface S1 is used to reduce the diffusion angle of the laser in the second direction.

[0103] The incident surface S1 is the target curved surface, which increases the diffusion angle of the laser in the slow axis direction, thus achieving laser beam expansion in the slow axis direction. This means that the diffusion angle of the beam emitted from the incident surface S1 in the slow axis direction is greater than the diffusion angle of the beam irradiating the incident surface S1 in the slow axis direction. And / or, it reduces the diffusion angle of the laser in the fast axis direction, thus achieving laser beam contraction in the fast axis direction. This means that the diffusion angle of the beam emitted from the incident surface S1 in the fast axis direction is less than the diffusion angle of the beam irradiating the incident surface S1 in the second direction.

[0104] Since the target surface does not include the reflecting surface S of the reflecting prism 802 at this time. R Therefore, the reflecting surface S R It is a plane. Because the reflecting surface S R The laser beam in the slow axis direction was not expanded, nor was the laser beam in the fast axis direction contracted. Therefore, the laser beam reflected by the reflector S... R The light reflected onto the incident surface S1 still presents an elliptical light spot. The incident surface S1 expands the laser beam along the slow axis and / or contracts the laser beam along the fast axis before emission. The emitted laser beam corresponds to a circular or nearly circular light spot, thereby improving the uniformity of the energy distribution of the light spot.

[0105] Referring to Figure 14, specifically, in one feasible implementation, the incident surface S1 has only a third curvature, and the incident surface S1 is a second concave surface. The incident surface S1 is used to increase the diffusion angle of the laser in the first direction. At this time, the third axis Z3 is located on the side of the incident surface S1 away from the emitting surface S2.

[0106] Since the incident surface S1 has a third curvature around the third axis Z3 and the incident surface S1 is a second concave surface, the incident surface S1 can increase the diffusion angle of the laser in the slow axis direction, thereby expanding the laser beam in the slow axis direction.

[0107] Since the incident surface S1 only has a third curvature and not a fourth curvature, the intersection of the incident surface S1 with the third plane is a concave curve, and the intersection with the fourth plane is a straight line.

[0108] The third plane is the plane formed by the slow axis direction and the optical axis of the laser, and the fourth plane is the plane formed by the fast axis direction and the optical axis of the laser.

[0109] The incident plane S1 is the surface formed by EFGH, with the slow axis corresponding to the X-axis, the fast axis corresponding to the Y-axis, and the laser beam axis corresponding to the Z'-axis. The third plane is the plane formed by the X-axis and Z'-axis, and the fourth plane is the plane formed by the Y-axis and Z'-axis. ， The plane formed by the axes. In this case, the optical axis of the collimating lens 803 can also be the Z' axis.

[0110] It is understandable that the laser's transmission direction is changed after passing through the reflecting prism 802, thus the laser's optical axis also changes, making the optical axis of the laser emitted from the light-emitting chip 801 different from the optical axis of the laser incident on the incident light surface S1.

[0111] The intersection of the incident surface S1 and the third plane is the line G, the line H, and the line parallel to the line G or H shown in Figure 14. Since the intersection of the incident surface S1 and the third plane is a concave curve, the lines G, H, and the line parallel to the line G or H are concave curves. At this time, the laser incident along the slow axis direction irradiates the incident surface S1. The incident surface S1 can diverge the laser in the slow axis direction, realize beam expansion, and transmit it to the exit surface S2.

[0112] Meanwhile, the intersection of the incident surface S1 and the fourth plane is the lines E and F shown in Figure 14, as well as the line parallel to E or F. Since the intersection of the incident surface S1 and the fourth plane is a straight line at this time, the lines E and F, as well as the line parallel to E or F, are straight lines. At this time, the laser incident along the fast axis direction irradiates the incident surface S1, and the incident surface S1 only transmits the laser in the fast axis direction to the exit surface S2, without diverging or converging the laser in the fast axis direction.

[0113] Since lines E and F are both straight lines and lines G and H are both curves, the incident light surface S1 is a cylindrical surface.

[0114] Referring to Figure 15, specifically, in another feasible implementation, the incident surface S1 has only a fourth curvature, and the incident surface S1 is a second convex surface. The incident surface S1 is used to reduce the diffusion angle of the laser in the second direction. In this case, the fourth axis Z4 is located on the side of the incident surface S1 facing the emitting surface S2.

[0115] Since the incident surface S1 has a fourth curvature around the fourth axis Z4 and the incident surface S1 is a second convex surface, the incident surface S1 can reduce the diffusion angle of the laser in the fast axis direction, thereby achieving beam shrinking of the laser in the fast axis direction.

[0116] Since the incident surface S1 only has the fourth curvature and not the third curvature, the intersection of the incident surface S1 with the third plane is a straight line, and the intersection with the fourth plane is a convex curve.

[0117] The intersection of the incident surface S1 and the third plane is shown in Figure 15 as lines G and H, and lines parallel to lines G or H. Since the intersection of the incident surface S1 and the third plane is a straight line, lines G and H, and lines parallel to lines G or H, are straight lines. At this time, the laser incident along the slow axis direction irradiates the incident surface S1. The incident surface S1 only transmits the laser in the slow axis direction to the exit surface S2, without diverging or converging the laser in the slow axis direction.

[0118] Meanwhile, the intersection of the incident surface S1 and the fourth plane is the E and F lines shown in Figure 15, as well as the line parallel to the E or F line. Since the intersection of the incident surface S1 and the fourth plane is a convex curve at this time, the E and F lines and the line parallel to the E or F line are convex curves. At this time, the laser incident along the fast axis direction irradiates the incident surface S1, and the incident surface S1 can converge the laser in the fast axis direction to achieve beam contraction and transmit it to the exit surface S2.

[0119] Since lines E and F are both curves and lines G and H are both straight lines, the incident light surface S1 is also a cylindrical surface.

[0120] Referring to Figure 16, specifically, in another feasible implementation, the incident surface S1 simultaneously has a third curvature and a fourth curvature. The third axis is located on the side of the incident surface S1 away from the emitting surface S2, and the fourth axis is located on the side of the incident surface S1 facing the emitting surface S2. The incident surface S1 is used to increase the diffusion angle of the laser in the first direction and also to reduce the diffusion angle of the laser in the second direction.

[0121] Since the incident surface S1 has both a third curvature and a fourth curvature, and the third axis is located on the side of the incident surface S1 away from the exit surface S2, and the fourth axis is located on the side of the incident surface S1 facing the exit surface S2, the incident surface S1 can both increase the diffusion angle of the laser in the first direction and decrease the diffusion angle of the laser in the second direction, that is, increase the diffusion angle of the laser in the slow axis direction and decrease the diffusion angle of the laser in the fast axis direction.

[0122] Since the incident surface S1 has both a third curvature and a fourth curvature, and the third axis is located on the side of the incident surface S1 away from the exit surface S2, and the fourth axis is located on the side of the incident surface S1 facing the exit surface S2, the intersection of the incident surface S1 with the third plane is a concave curve, and the intersection with the fourth plane is a convex curve.

[0123] The intersection of the incident surface S1 and the third plane is the line G, the line H, and the line parallel to line G or H shown in Figure 16. Since the intersection of the incident surface S1 and the third plane is a concave curve, the lines G, H, and the line parallel to line G or H are concave curves. At this time, the laser incident along the slow axis direction irradiates the incident surface S1. The incident surface S1 can diverge the laser in the slow axis direction, realize beam expansion, and transmit it to the exit surface S2.

[0124] Meanwhile, the intersection of the incident surface S1 and the fourth plane is the E and F lines shown in Figure 16, as well as the line parallel to the E or F line. Since the intersection of the incident surface S1 and the fourth plane is a convex curve at this time, the E and F lines and the line parallel to the E or F line are convex curves. At this time, the laser incident along the fast axis direction irradiates the incident surface S1, and the incident surface S1 can converge the laser in the fast axis direction to achieve beam contraction and transmit it to the exit surface S2.

[0125] Since lines E and F are both curves, and lines G and H are also curves, the surface of the incident light surface S1 is also a non-cylindrical surface.

[0126] In summary, by setting the incident surface S1 of the alignment lens 803, the laser beam is expanded in the slow axis direction to increase its size in that direction, and / or contracted in the fast axis direction to reduce its size. This reduces the size difference between the slow and fast axes, making the laser size in the slow and fast axes equal or within a preset range. This improves the consistency of the laser size in the slow and fast axes, resulting in a circular or near-circular light spot. This makes the light spot energy distribution uniform, effectively improving the uniformity of the laser spot array, and thus enhancing the display effect of the projected image.

[0127] In another implementation scenario, when the reflecting surface S of the reflecting prism 802... R When both the incident surface S1 of the collimating lens 803 and the target curved surface are the same, the following situations may occur:

[0128] ① Reflecting surface S R Both the incident surface S1 and the incident surface S1 expand the laser beam in the slow axis direction, and the laser beam in the slow axis direction is expanded twice.

[0129] ② Reflecting surface S R Both the incident surface S1 and the incident surface S1 reduce the laser beam in the fast axis direction, and the laser beam in the fast axis direction is reduced twice.

[0130] ③ Reflecting surface S RThe laser beam in the slow axis direction is expanded, and the incident light surface S1 is reduced to a smaller beam for the laser beam in the fast axis direction. At this time, the laser beam in the slow axis direction is expanded once, and the laser beam in the fast axis direction is reduced once.

[0131] ④ Reflecting surface S R The laser beam in the fast axis direction is reduced, and the incident light surface S1 expands the laser beam in the slow axis direction. At this time, the laser beam in the slow axis direction is expanded once, and the laser beam in the fast axis direction is reduced once.

[0132] Of the four cases shown above, when the reflecting surface S R When both the incident surface S1 and the incident surface S1 expand the laser beam along the slow axis, the degree of expansion can be set according to the actual situation, ensuring that after the two expansions, the size of the laser in the slow axis direction is equal to or within a preset range as the size in the fast axis direction. At this point, the laser beam passes through the reflecting surface S1. R The light reflected onto the incident surface S1 forms an elliptical spot, which is more pronounced than the light reflected from the reflecting surface S1. R Without beam expansion, the difference between the size of the laser beam in the slow axis direction and its size in the fast axis direction is reduced for the elliptical spot that appears on the incident surface S1.

[0133] Similarly, when the reflecting surface S R When both the incident surface S1 and the laser beam are contracted along the fast axis, the degree of contraction can be set according to the actual situation. The goal is to ensure that after the two contractions, the size of the laser beam along the fast axis is equal to or within a preset range as the size along the slow axis. At this point, the laser beam passes through the reflecting surface S... R The light reflected onto the incident surface S1 still presents an elliptical light spot, unlike the light reflected from the reflecting surface S1. R For the laser beam in the fast axis direction, no beam contraction is performed. As for the elliptical spot that appears on the incident surface S1, the difference between the size of the laser beam in the slow axis direction and the size in the fast axis direction is reduced.

[0134] In addition to the various cases shown above, the target surface can also expand the laser beam in both the fast axis and slow axis directions, but the expansion degree in the fast axis direction is smaller and the expansion degree in the slow axis direction is larger, so that the size of the laser beam in the fast axis and slow axis directions is the same or similar.

[0135] Alternatively, the target surface can also reduce the laser beam in both the fast and slow axis directions, but the reduction in the fast axis direction is greater and the reduction in the slow axis direction is smaller, which can also make the laser size the same or similar in the fast and slow axis directions.

[0136] In some embodiments, the curvature of the light-emitting surface S2 of the alignment lens 803 can be set so that the light-emitting surface S2 can collimate both the laser in the first direction and the laser in the second direction, that is, the light-emitting surface S2 can collimate both the laser in the slow axis direction and the laser in the fast axis direction.

[0137] Figure 17 is a schematic diagram of a collimating lens provided in an embodiment of this application. Referring to Figure 17, in one implementation scenario, the light-emitting surface S2 has a fifth curvature around the fifth axis Z5, and the light-emitting surface S2 has a sixth curvature around the sixth axis Z6.

[0138] The fifth axis Z5 is parallel to the second direction, and the sixth axis Z6 is parallel to the first direction. Both the fifth axis Z5 and the sixth axis Z6 are located on the side of the light-emitting surface S2 facing the light-incident surface S1. The fifth curvature is less than or equal to the sixth curvature.

[0139] Specifically, when the diffusion angle along the slow axis is less than the diffusion angle along the fast axis when the laser is incident on the emitting surface S2, the fifth curvature is less than the sixth curvature. When the diffusion angle along the slow axis is equal to the diffusion angle along the fast axis when the laser is incident on the emitting surface S2, the fifth curvature is equal to the sixth curvature.

[0140] The fifth curvature of the light-emitting surface S2 of the collimating lens 803 is less than or equal to the sixth curvature, so as to collimate the laser in both the fast axis and slow axis directions. This makes the diffusion angle of the laser in the two directions closer, which helps to ensure the uniformity of energy distribution, improve the display effect, and also reduces the design difficulty of the subsequent optical system, avoiding reduced efficiency and energy loss.

[0141] In one implementation scenario, the light-emitting surface S2 of the collimating lens 803 is a curved surface. This curved surface can be a spherical surface, an aspherical surface, a freeform surface, or a cylindrical surface, etc. This application does not limit the type of curved surface, as long as the curved surface can collimate the laser in the fast axis direction and the laser in the slow axis direction.

[0142] In some embodiments, the laser 800 further includes a base plate and a housing.

[0143] The tube shell, the light-emitting chip 801, and the reflecting prism 802 are all fixed on the base plate, and the light-emitting chip 801 and the reflecting prism 802 are both located within the area enclosed by the tube shell. The collimating lens 803 is connected to the side of the tube shell opposite to the base plate. The base plate and the tube shell can be referenced to the base plate 101 and tube shell 102 shown in Figure 2.

[0144] Figure 18 is a schematic diagram of a collimating lens according to an embodiment of this application. Referring to Figure 18, specifically, in one embodiment, the collimating lens 803 includes: a lens 8031 ​​and a lens body 8032 connected together.

[0145] Lens 8031 ​​is connected to the side of the tube shell away from the base plate, and lens body 8032 is located on the side of lens 8031 ​​away from the tube shell.

[0146] Among them, the side of lens 8031 ​​facing away from lens body 8032 is the light-incident surface S1, and the side of lens body 8032 facing away from lens 8031 ​​is the light-exit surface S2.

[0147] In one embodiment, the laser 800 further includes a cover plate. The cover plate is fixedly connected to the side of the housing opposite to the base plate, and the lens is fixedly connected to the side of the cover plate opposite to the housing.

[0148] The cover plate has a light-transmitting area, and the lens body is located within the light-transmitting area. The cover plate can be referred to as cover plate 103 shown in Figure 2.

[0149] Figure 19 is a partial structural diagram of a laser provided in an embodiment of this application. Referring to Figure 19, in one embodiment, the laser 800 further includes a gasket 805.

[0150] The washer 805 is fixed between the collimating lens (lens 8031) and the cover plate, and the light-transmitting area is located within the area enclosed by the washer 805. The collimating lens and cover plate in Figure 19 can be compared with lens 104 and cover plate 103 in Figure 2.

[0151] The gap between the collimating lens 803 and the cover plate can be raised by the washer 805, that is, the gap between the lens 8031 ​​and the cover plate can be raised to avoid interference between the light-incident surface S1 and the cover plate. For example, it can prevent interference between the light-incident surface S1 and the cover plate when the light-incident surface S1 has a second convex curved surface.

[0152] In one embodiment, there are multiple light-emitting chips 801 and multiple reflective prisms 802, and at least two housings; the multiple light-emitting chips 801 and multiple reflective prisms 802 are arranged in at least two rows;

[0153] Among them, at least two tube shells correspond to at least two rows of light-emitting chips 801 and at least two rows of reflective prisms 802; each tube shell encloses an area with a corresponding row of light-emitting chips 801 and a corresponding row of reflective prisms 802.

[0154] At this time, the arrangement of the light-emitting chip 801, the reflective prism 802 and the tube shell can be compared with the arrangement of the light-emitting unit 105, the reflector 106 and the tube shell 102 in Figure 2.

[0155] Referring to Figure 2, for example, there are multiple light-emitting chips 801 and multiple reflecting prisms 802, and two housings. The multiple light-emitting chips 801 and multiple reflecting prisms 802 are arranged in two rows. Each housing corresponds one-to-one with both rows of light-emitting chips 801 and two rows of reflecting prisms 802. Each housing encloses a corresponding row of light-emitting chips 801 and a corresponding row of reflecting prisms 802.

[0156] In one implementation scenario, the distance between the reflecting prism 802 and the collimating lens 803 is greater than or equal to 1.6 mm and less than or equal to 2 mm, i.e., 1.6 mm ≤ l2 ≤ 2 mm.

[0157] The following uses the reflecting surface S of the reflecting prism 802 as an example. R Taking the target curved surface as an example, this explains how to make the laser dimensions consistent in the slow axis and fast axis directions. For the same or similar concepts or processes, they may not be described again in some embodiments.

[0158] Referring to Figure 9, specifically, in one feasible implementation, the reflecting surface S R Having only the first curvature, and the reflecting surface S R It is the first convex surface.

[0159] Figure 20 is a schematic diagram of the laser collimation process in the fast axis direction provided in an embodiment of this application. Referring to Figure 20, θ f The divergence angle half-angle of the laser in the fast axis direction is represented by l1, which represents the distance from the light-emitting chip 801 to the reflecting prism 802. Specifically, it is the distance from the intersection of the laser's optical axis and the reflecting prism 802 to the light-emitting chip 801. The distance from the reflecting prism 802 to the collimating lens 803 is specifically the distance from the intersection of the laser's optical axis and the reflecting prism 802 to the incident surface S1 of the collimating lens 803.

[0160] The diameter of the laser beam along the fast axis on the incident surface S1 of the collimating lens 803 is l3 = 2(l1 + l2) * tanθ f .

[0161] Figure 21 is a schematic diagram of the laser collimation process in the slow axis direction according to an embodiment of this application. Referring to Figure 21, if the diameters of the laser in the slow axis direction and the laser in the fast axis direction are the same on the incident surface S1 of the collimating lens 803, then l3 = 2(l1 + l2) * tanθ must be satisfied. f =2l1*tanθ s +2l2*tanθ r , where θ r =arcsin(d / l1)+arcsin(d / r).

[0162] Where l3 is the diameter of the laser beam along the fast axis or slow axis on the incident surface S1 of the collimating lens 803, and θ s Let θ be the half-angle of the laser divergence in the slow axis direction, r be the radius of curvature of the reflecting prism 802, and its corresponding center be denoted as O. Let d be the distance between the intersection of the laser's optical axis and the reflecting prism 802 and the line connecting the light-emitting chip 801 and the center O. r The divergence angle corresponding to the slow axis is the angle that diverges after passing through the reflecting prism.

[0163] Referring to Figure 10, specifically, in one feasible implementation, the reflecting surface S R It has only the second curvature, and the reflecting surface S R It is the first concave surface.

[0164] The diameter of the laser beam along the fast axis on the incident surface S1 of the collimating lens 803 is l3 = 2l1 * tanθ. s +2l2*tanθ r .

[0165] If the laser beams along the slow axis and the fast axis have the same diameter on the incident surface S1 of the collimating lens 803, then l3 = 2(l1 + l2) * tanθ must be satisfied. f =2l1*tanθ s +2l2*tanθ r , where θ r =arcsin(d / l1)+arcsin(d / r).

[0166] At this time, θ s θ is the half-angle of the laser divergence along the fast axis. r Let θ be the angle of divergence corresponding to the fast axis after passing through the reflecting prism. f This represents the half-angle of the laser divergence in the slow axis direction.

[0167] Referring to Figure 11, specifically, in one feasible implementation, the reflecting surface S R It simultaneously possesses a first curvature and a second curvature, with the first axis located at the reflecting surface S. R On the side opposite to the light-emitting chip 801, the second axis is located on the reflective surface S. R The side facing the light-emitting chip 801.

[0168] The diameter of the laser in the first direction (i.e., the slow axis) is l. 31 The diameter of the laser in the second direction (i.e., the fast axis) is l. 32 .

[0169] The diameter of the laser beam along the slow axis on the incident surface S1 of the collimating lens 803 is l. 31 =2l1*tanθ s1+2l2*tanθ r1 .

[0170] The diameter of the laser beam along the fast axis on the incident surface S1 of the collimating lens 803 is l. 32 =2l1*tanθ s2 +2l2*tanθ r2 .

[0171] Where, θ r1 =arcsin(d1 / l1)+arcsin(d1 / r1),θ r2 =arcsin(d2 / l1)+arcsin(d2 / r2).

[0172] If the diameters of the laser beams along the slow axis and the fast axis are the same on the incident surface S1 of the collimating lens 803, then the following condition must be met: 31 =l 32 .

[0173] At this time, θ s1 θ is the half-angle of the laser divergence along the slow axis, r1 is the radius of curvature corresponding to the first curvature on the reflecting prism 802, and θ is the radius of curvature. r1 θ is the angle of divergence corresponding to the slow axis after passing through the reflecting prism. s2 θ is the half-angle of the laser divergence along the fast axis, r2 is the radius of curvature corresponding to the second curvature on the reflecting prism 802, and θ is the radius of curvature. r2 The divergence angle corresponding to the fast axis is the angle of divergence after passing through the reflecting prism.

[0174] The center of the circle corresponding to the first curvature is denoted as O1, and d1 is the distance between the intersection of the laser's optical axis and the reflecting prism 802 and the line connecting the light-emitting chip 801 and the center O1. The center of the circle corresponding to the second curvature is denoted as O2, and d2 is the distance between the intersection of the laser's optical axis and the reflecting prism 802 and the line connecting the light-emitting chip 801 and the center O2.

[0175] Figure 22 is a schematic diagram of the structure of a laser projection device provided in an embodiment of this application. Referring to Figure 22, an embodiment of this application also provides a light source device, which includes: a laser 800, a light combining component 101, and a lens component 102. The laser is the laser described in the previous embodiment.

[0176] Laser 800 emits red, green and blue lasers. The beam combining component 101 combines the red, green and blue lasers. The combined laser passes through lens component 102 and is emitted to light modulation component 20.

[0177] Referring to Figure 22, this application embodiment also provides a laser projection device, which includes: a light source device 10, a light modulation component 20, and a projection lens 30. The light source device 10, the light modulation component 20, and the projection lens 30 are also collectively referred to as an optical engine. The light source device 10 is the same as the light source device in the above embodiment.

[0178] The light modulation component is located on the light-emitting side of the light source device, and is used to modulate the light emitted from the light source device. The projection lens is located on the light-emitting side of the light modulation component.

[0179] Laser projection devices include, for example, televisions and vehicle-mounted projectors.

[0180] The optical modulation component 20 includes a homogenizer 201, a relay lens 202, a prism device 203, and an amplitude modulation device 204. The homogenizer 201 homogenizes and shapes the combined red, green, and blue laser light, which then illuminates the amplitude modulation device 204 via the relay lens 202 and prism device 203. The amplitude modulation device 204 is a core component of the laser projection equipment and can be categorized into transmissive LCD, LCOS, and DMD chips. Figure 22 shows an amplitude modulation device that is a DMD chip, applicable to DLP projection architectures.

[0181] Generally, the homogenizing device 201 in the light modulation component 20 can be a light bar or a double-sided compound eye lens, which, together with the relay lens 202, illuminates the amplitude light modulation device. Figure 22 shows an illumination scheme using a double-sided compound eye lens.

[0182] The laser 800 of this application can be applied to the aforementioned laser projection equipment, or to other application scenarios, and this application does not limit it in this regard.

[0183] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0184] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A laser, characterized in that, The laser includes: a light-emitting chip, a reflecting prism, and a collimating lens; The light-emitting chip is used to emit laser light along a third direction. The diffusion angle of the laser light in the first direction is smaller than the diffusion angle of the laser light in the second direction. The first direction, the second direction, and the third direction are perpendicular to each other. The reflecting prism has a reflecting surface, which is located on the light-emitting side of the light-emitting chip; The collimating lens has an incident surface and an exit surface, and the reflecting prism is used to reflect the laser light to the incident surface of the collimating lens; Wherein, at least one of the reflecting surface and the incident surface is a target curved surface, and the target curved surface is used to reduce the difference between the diffusion angle of the laser in the first direction and the diffusion angle of the laser in the second direction.

2. The laser according to claim 1, characterized in that, The reflecting surface is the target curved surface, the reflecting surface has a first curvature about a first axis, and / or the reflecting surface has a second curvature about a second axis; Wherein, the first axis is parallel to the second direction, and the second axis is parallel to the first direction.

3. The laser according to claim 2, characterized in that, The reflective surface is used to increase the diffusion angle of the laser in the first direction, and / or the reflective surface is used to reduce the diffusion angle of the laser in the second direction.

4. The laser according to claim 3, characterized in that, The reflecting surface has only the first curvature, and the reflecting surface is a first convex curved surface; the reflecting surface is used to increase the diffusion angle of the laser in the first direction.

5. The laser according to claim 3, characterized in that, The reflecting surface has only the second curvature, and the reflecting surface is a first concave curved surface; the reflecting surface is used to reduce the diffusion angle of the laser in the second direction.

6. The laser according to claim 3, characterized in that, The reflective surface has both the first curvature and the second curvature. The first axis is located on the side of the reflective surface away from the light-emitting chip, and the second axis is located on the side of the reflective surface facing the light-emitting chip. The reflective surface is used to increase the diffusion angle of the laser in the first direction and also to reduce the diffusion angle of the laser in the second direction.

7. The laser according to any one of claims 1 to 6, characterized in that, The incident surface is the target surface, the incident surface has a third curvature about a third axis, and / or the incident surface has a fourth curvature about a fourth axis; The third axis is parallel to the second direction, and the fourth axis is parallel to the first direction.

8. The laser according to claim 7, characterized in that, The incident surface is used to increase the diffusion angle of the laser in the first direction, and / or the incident surface is used to reduce the diffusion angle of the laser in the second direction.

9. The laser according to claim 8, characterized in that, The light-incident surface has only the third curvature, and the light-incident surface is a second concave surface; the light-incident surface is used to increase the diffusion angle of the laser in the first direction.

10. The laser according to claim 8, characterized in that, The light-incident surface has only the fourth curvature, and the light-incident surface is a second convex surface; the light-incident surface is used to reduce the diffusion angle of the laser in the second direction.

11. The laser according to claim 8, characterized in that, The incident surface has both the third curvature and the fourth curvature. The third axis is located on the side of the incident surface away from the exiting surface, and the fourth axis is located on the side of the incident surface facing the exiting surface. The incident surface is used to increase the diffusion angle of the laser in the first direction and also to reduce the diffusion angle of the laser in the second direction.

12. The laser according to any one of claims 1 to 6, 8 to 11, characterized in that, The light-emitting surface is used to collimate and emit the laser beam in both the first direction and the second direction.

13. The laser according to claim 12, characterized in that, The light-emitting surface has a fifth curvature about the fifth axis, and the light-emitting surface has a sixth curvature about the sixth axis; Wherein, the fifth axis is parallel to the second direction, and the sixth axis is parallel to the first direction; both the fifth axis and the sixth axis are located on the side of the light-emitting surface facing the light-incident surface; the fifth curvature is less than or equal to the sixth curvature.

14. The laser according to any one of claims 1 to 6, 8 to 11, and 13, characterized in that, The laser also includes: a base plate and a housing; The tube shell, the light-emitting chip, and the reflecting prism are all fixed on the base plate, and the light-emitting chip and the reflecting prism are both located within the area enclosed by the tube shell; the collimating lens is connected to the side of the tube shell opposite to the base plate.

15. The laser according to claim 14, characterized in that, The collimating lens includes: a lens element and a lens body connected together; The lens is connected to the side of the tube shell opposite to the base plate, and the lens body is located on the side of the lens opposite to the tube shell; The side of the lens that faces away from the lens body is the light-incident surface, and the side of the lens body that faces away from the lens is the light-outceasing surface.

16. The laser according to claim 15, characterized in that, The laser also includes: a cover plate; the cover plate is fixedly connected to the side of the tube shell opposite to the base plate, and the lens is fixedly connected to the side of the cover plate opposite to the tube shell; The cover plate has a light-transmitting area, and the lens body is located within the light-transmitting area.

17. The laser according to claim 16, characterized in that, The laser also includes: a gasket; The gasket is fixed between the lens and the cover plate, and the light-transmitting area is located within the area enclosed by the gasket.

18. The laser according to claim 16, characterized in that, The number of light-emitting chips and the number of reflecting prisms are both multiple, and the number of tube shells is at least two; the multiple light-emitting chips and the multiple reflecting prisms are arranged in at least two rows; In this configuration, at least two of the tube shells correspond to at least two rows of the light-emitting chips and at least two rows of the reflective prisms; each tube shell encloses an area containing a corresponding row of the light-emitting chips and a corresponding row of the reflective prisms.

19. A light source device, characterized in that, The light source device includes: a laser, a light combining component, and a lens component, wherein the laser is any one of the lasers described in claims 1 to 18.

20. A laser projection device, characterized in that, The laser projection device includes: the light source device as described in claim 19, as well as a light modulation component and a projection lens; The light modulation component is located on the light-emitting side of the light source device, and the light modulation component is used to modulate the light emitted from the light source device; The projection lens is located on the light-emitting side of the light modulation component.

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