Laser and projection system

Abstract

The utility model discloses a laser and a projection system, and the laser comprises a tube which forms an accommodation space; the light-emitting assemblies are located in the containing space. The cover plate is positioned on the tube shell and is sealed with the tube shell; the sealing ring is positioned around the tube shell and the cover plate; the sealing ring extrudes the peripheries of the tube shell and the cover plate to seal the laser; the optical lens is fixed on the cover plate through the first bonding part and the second bonding part. The first bonding part and the second bonding part are two kinds of glue with different hardness. The glue with higher hardness has higher rigidity, so that the glue is not easy to deform in a high-temperature environment, and the position of the optical lens can be kept unchanged even if the glue is extruded by the sealing ring; and the glue with relatively low hardness has the characteristic of flexible buffering, and can better adapt to temperature cycle change, so that the problems of cracking and falling after a temperature cycle experiment are avoided, and the long-term reliability of the laser is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of projection technology, in particular to a laser and a projection system. BACKGROUND

[0002] Laser projection equipment has been widely used in home theater, digital cinema, commercial display, education and outdoor advertising and other fields due to its high brightness, wide color gamut, long service life and low energy consumption. As an important component of laser projection equipment, the performance of the laser directly determines the display quality and efficiency of the whole machine.

[0003] The commonly used laser at present is usually a semiconductor laser. The laser emitted by the semiconductor laser has a certain divergence angle, so an optical lens needs to be arranged at the light outlet of the laser to reduce the divergence angle of the laser. The laser generates a large amount of heat when working, and in this high-temperature environment, the packaging structure of the laser is easily affected by thermal stress, especially the adhesive material used to fix the collimating lens may deform, thereby causing the problem of spot shift. UTILITY MODEL CONTENT

[0004] The present application provides a laser, comprising:

[0005] A tube shell comprising a bottom plate and a side wall, the bottom plate and the side wall forming a containing space;

[0006] A plurality of light emitting components located in the containing space;

[0007] A cover plate located on the tube shell and sealed with the tube shell;

[0008] A sealing ring located around the tube shell and the cover plate; the sealing ring extrudes around the tube shell and the cover plate; and

[0009] An optical lens located on the cover plate;

[0010] The optical lens is fixed on the cover plate through a first adhesive part and a second adhesive part; the hardness of the first adhesive part and the second adhesive part is different.

[0011] In some embodiments of the present application, the first adhesive part is located at the edge position of the optical lens, and the first adhesive part does not contact the sealing ring;

[0012] The second adhesive part is located at the corner position of the optical lens, and the second adhesive part contacts the sealing ring;

[0013] The hardness of the first adhesive part is less than the hardness of the second adhesive part.

[0014] In some embodiments of the present application, the first adhesive portion has a glass transition temperature less than that of the second adhesive portion.

[0015] The second adhesive portion has a glass transition temperature greater than the operating temperature of the laser.

[0016] In some embodiments of the present application, the first adhesive portion is located between the optical lens and the cover plate, and the edge of the first adhesive portion does not exceed the edge of the optical lens.

[0017] In some embodiments of the present application, the optical lens comprises a plurality of lens units arranged in a lens unit matrix.

[0018] The first adhesive portion is a strip-shaped adhesive portion, which is arranged parallel to the long side of the lens unit matrix, and the length of the strip-shaped adhesive portion is greater than or equal to the length of the long side of the lens unit matrix.

[0019] In some embodiments of the present application, the second adhesive portion is located between the optical lens and the cover plate, and the edge of the second adhesive portion exceeds the edge of the optical lens.

[0020] In some embodiments of the present application, the first adhesive portion has a hardness of D40 to D60, and the second adhesive portion has a hardness of D65 to D80.

[0021] In some embodiments of the present application, the first adhesive portion has a thermal expansion coefficient less than 70 ppm / ℃.

[0022] In some embodiments of the present application, the second adhesive portion has a glass transition temperature greater than 85℃.

[0023] The embodiments of the present application also provide a projection system, comprising:

[0024] A laser light source for emitting a projection light beam; the laser light source comprises any of the above lasers;

[0025] A display element located on the light emitting side of the laser light source, for modulating the projection light beam emitted by the laser light source to form an image light beam; and

[0026] A lens located on the light emitting side of the display element, for projecting and imaging the image light beam.

[0027] The laser and the projection system provided by the embodiment of the present application comprise: a tube shell forming a containing space; a plurality of light emitting assemblies located in the containing space; a cover plate located on the tube shell and sealing the tube shell; a sealing ring located around the tube shell and the cover plate; the sealing ring extruding around the tube shell and the cover plate to seal the laser; and an optical lens fixed on the cover plate through a first adhesive part and a second adhesive part. The first adhesive part and the second adhesive part are two kinds of glue with different hardness. The glue with greater hardness has greater rigidity, and thus is not easy to deform in a high-temperature environment, and even if extruded by the sealing ring, the position of the optical lens can be kept unchanged; and the glue with smaller hardness has the characteristics of flexible buffering, can better adapt to temperature cycle changes, avoids the problems of cracking and falling after a temperature cycle experiment, and is beneficial to the long-term reliability of the laser. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings introduced below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0029] Figure 1 FIG. 1 is a structural schematic diagram of a laser;

[0030] Figure 2 FIG. 2 is a structural schematic diagram of a light emitting assembly;

[0031] Figure 3 FIG. 3 is a schematic diagram of the position relationship between an optical lens and an adhesive part;

[0032] Figure 4 FIG. 4 is a schematic diagram of the adhesive part before curing;

[0033] Figure 5 FIG. 5 is a schematic diagram of the adhesive part after curing;

[0034] Figure 6 FIG. 6 is a schematic diagram of the position relationship between the optical lens, the adhesive part and the sealing ring;

[0035] Figure 7 FIG. 7 is a structural schematic diagram of a laser provided by the embodiment of the present application;

[0036] Figure 8 FIG. 8 is a structural schematic diagram of a projection system provided by the embodiment of the present application;

[0037] Figure 9 FIG. 9 is a structural schematic diagram of a projection light source provided by the embodiment of the present application;

[0038] Figure 10 FIG. 10 is another structural schematic diagram of a projection light source provided by the embodiment of the present application. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the application will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms describing position and direction described in this application are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of this application. The accompanying drawings of this application are for illustrating relative positional relationships only and do not represent actual scale.

[0040] Projection display is a display technology that uses planar image information to control a light source, and utilizes an optical system and projection space to magnify and display the image on a projection medium. With the development of projection display technology, projection displays are gradually being applied to business activities, conferences and exhibitions, scientific education, military command, traffic management, centralized monitoring, and advertising and entertainment. Its advantages, such as large display size and clear display, also make it suitable for the requirements of large-screen displays.

[0041] With its advantages of high brightness, high contrast and wide color gamut, laser technology can provide a realistic large-screen viewing experience when applied to projection systems. It is also energy-saving, environmentally friendly, low-maintenance and flexible in installation, making it an ideal choice for home entertainment.

[0042] With continuous technological advancements and reduced production costs, the demand for laser projection systems continues to grow in the market, especially in the market demanding large screens and high image quality, where it shows broad development prospects.

[0043] In home settings, laser TVs can project ultra-high-definition images larger than 100 inches, providing users with an immersive viewing experience. In the commercial sector, laser projectors can meet the high brightness requirements of large venues, stage performances, and outdoor architectural projection. In educational settings, the stability and low maintenance costs of laser projectors make them an ideal choice for digital teaching. With the widespread adoption of 4K / 8K ultra-high-definition content and the deepening application of High Dynamic Range (HDR) technology, the market is placing higher demands on the image quality and long-term reliability of laser projection devices.

[0044] As a core component of the laser projection system, the optical performance of the laser directly determines the display quality and display brightness of the laser projection system. At present, the widely used and relatively mature laser is a semiconductor laser, which generates a high-purity and high-directional laser beam by exciting a semiconductor material.

[0045] Figure 1 is a structural schematic diagram of the semiconductor laser. As shown in Figure 1 , the semiconductor laser comprises a tube shell 111, a light-emitting assembly 112, a sealing member 113, a cover plate 114 and an optical lens 115.

[0046] The tube shell 111 can generally include a bottom plate and an annular side wall, and the bottom plate and the side wall constitute a containing space for containing and packaging the light-emitting assembly 112.

[0047] The bottom plate and the side wall of the tube shell can be made of the same material, for example, can be made of oxygen-free copper or Kovar metal and the like. The bottom plate and the side wall can be made separately and then welded to form the containing space.

[0048] A plurality of light-emitting assemblies 112 are fixed on the bottom plate of the tube shell 111. As shown in Figure 2 , the light-emitting assembly 112 comprises a laser chip 1121, a heat sink 1122 and a reflector 1123. The laser chip 1121 and the heat sink 1122 are welded by a high-precision eutectic welding machine to form a laser chip assembly, also known as a Cos (Chip on submount, abbreviated as Cos) assembly. The heat sink 1122 is used for heat dissipation of the laser chip 1121, and can also be made of metal material, which is not limited here.

[0049] A plurality of reflectors 1123 are located in the tube shell 111. One reflector 1123 corresponds to at least one laser chip assembly, and the reflector 1123 is located on the light-emitting side of the corresponding laser chip assembly and is used for reflecting the laser emitted by the laser chip to the opening direction of the tube shell.

[0050] The reflector 1123 can use a reflective prism, or can use a support piece in combination with a reflective film to reflect the laser beam emitted by the laser chip.

[0051] The sealing member 113 is located around the opening of the tube shell 111, and is used to connect the cover plate 114 and the tube shell 111 together to form a sealed space for packaging the light-emitting assembly 112.

[0052] The sealing member 113 can include a metal frame and sealing glass. The sealing glass can be a solder glass, which is filled in the gap between the edge of the cover plate 114 and the metal frame as an intermediate layer to form a ring-shaped sealing ring. The metal frame can be Kovar alloy or the like, which is welded to the tube shell as a transition structure.

[0053] The cover plate 114 can be a light-transmitting glass, which is sealed to the tube shell and can also transmit the laser light emitted by the light-emitting assembly 112.

[0054] The laser chip 1121 is made of semiconductor material. Due to the limitations of the material and the light-emitting principle, the laser beam emitted by the laser chip 1121 has a certain divergence angle. If not controlled, the spot size will become larger and larger with the increase of the transmission distance, which is extremely low in efficiency and cannot be used by the optical engine of the whole machine.

[0055] Therefore, the optical lens 115 is arranged above the cover plate 114. The optical lens includes a plurality of lens units arranged in a matrix, and each lens unit corresponds to a light-emitting assembly 112, which is used to collimate the laser beam emitted by the light-emitting assembly 112, so as to control the divergence angle and the deflection angle of the laser beam within 1°, thereby greatly improving the beam quality and light-emitting efficiency.

[0056] As shown in Figure 3 , the optical lens 115 can be fixed on the cover plate 114 by using glue s as a connecting medium, and then the glue is cured by UV curing or heat curing, so that the optical lens 115 can be reliably bonded to the laser to achieve long-term reliable high-quality beam output.

[0057] Specifically, as shown in Figure 4 , first, the glue s is injected at the edge of the optical lens 115, and the optical lens 115 is pressed. At this time, as shown in Figure 5 , the glue s will overflow outside the edge of the optical lens 115. After the glue s is cured, the optical lens 115 can be fixed on the cover plate 114.

[0058] As shown in Figure 6 , in order to make the components in the tube shell work stably for a long time, a sealing ring 116 is usually arranged around the optical lens 115 on the upper part of the tube shell of the laser. The sealing ring 116 can be made of elastic material such as rubber ring, which can realize airtightness of the laser by extruding the periphery of the tube shell. Since the glue s will overflow outside the edge of the optical lens 115, the sealing ring 116 will extrude the glue s after the sealing ring 116 is arranged.

[0059] In use scenarios of the laser projection system, the laser and other devices generate heat during operation, and the laser projection system is usually in a high-temperature environment. The high temperature causes the glass transition temperature (Tg) of the glue s to decrease, so that the glue s changes from a hard glass state to a soft rubber state, and is more likely to deform. In addition, the high temperature can cause chemical degradation of the glue s, weaken the mechanical strength of the glue s, and make the glue s more likely to deform when being pressed by the sealing ring 116. The deformed glue s cannot effectively fix the position and angle of the optical lens 115, causing displacement or inclination of the optical lens 115, destroying the collimation of the laser beam, and finally causing an increase in the spot divergence angle and a position offset.

[0060] To overcome the above problems, a glue with a very high Tg point can be selected, but the hardness and brittleness of the glue are greatly improved, and the glue is prone to cracking and falling off after temperature cycle experiments, which is not conducive to the long-term reliability of the laser.

[0061] Therefore, embodiments of the present application provide a laser, as shown in Figure 7 The optical lens 115 is fixed to the cover plate 114 by the first adhesive part s1 and the second adhesive part s2. The first adhesive part s1 and the second adhesive part s2 can be cured glue, specifically, heat-cured resin or ultraviolet-cured resin. The first adhesive part s1 and the second adhesive part s2 are two kinds of glue with different hardness. The glue with higher hardness has greater rigidity, and is therefore not easy to deform in a high-temperature environment, and can keep the position of the optical lens unchanged even if it is pressed by the sealing ring. The glue with lower hardness has the characteristics of flexibility and buffering, can better adapt to temperature cycle changes, avoid cracking and falling off after temperature cycle experiments, and is conducive to the long-term reliability of the laser. Through the combination of the two kinds of glue with different hardness, the laser can resist extrusion and deformation under high-temperature conditions, and meet the requirements of the laser in severe temperature cycle experiments.

[0062] In embodiments of the present application, the hardness of the first adhesive part s1 is less than the hardness of the second adhesive part s2. As shown in Figure 7 The first adhesive part s1 is arranged at the edge position of the optical lens 115, and the second adhesive part s2 is arranged at the corner position of the optical lens 115.

[0063] The first adhesive part s1 with smaller hardness is arranged at the edge of the optical lens, and can have a larger volume and be responsible for the adhesive strength of more than 50% of the optical lens 115 and the tube shell. The first adhesive part s1 has higher adaptability to temperature changes, and is arranged at the edge of the optical lens to reduce the risk of fatigue failure caused by repeated thermal expansion and cold contraction. The second adhesive part s2 with larger hardness is arranged at the corner of the optical lens 115, and can provide better rigid fixation and strengthen the four corners to prevent displacement. The second adhesive part s2 has a smaller volume than the first adhesive part s1, so that the probability of cracking of the second adhesive part s2 in the temperature cycle test can be reduced. Through the cooperation of the soft glue and the hard glue, when the hard glue fails due to high temperature aging, the soft glue can still maintain good adhesive force; when the soft glue deforms due to high temperature, the hard glue provides better rigid support.

[0064] In specific implementation, the proportion and distribution of the first adhesive part and the second adhesive part can be optimized according to actual application, which is not limited herein.

[0065] In the embodiments of the present application, as shown in Figure 7 The edge of the first adhesive part s1 does not exceed the edge of the optical lens 115, so that the first adhesive part s1 does not contact the sealing ring; and the edge of the second adhesive part s2 exceeds the edge of the optical lens 115 and contacts the sealing ring.

[0066] The first adhesive part s1 is soft glue, which is prone to deformation under high temperature environment if extruded. Therefore, when the first adhesive part s1 is arranged, the amount and dispensing position of the first adhesive part s1 need to be adjusted, so that after the optical lens 115 is pressed, the first adhesive part s1 will not exceed the edge of the optical lens 115, and the first adhesive part s1 will not contact the sealing ring and be extruded by the sealing ring, thereby reducing the risk of extrusion deformation. The second adhesive part s2 is hard glue, which is distributed at the four corners of the optical lens 115, and the second adhesive part s2 overflows the edge of the optical lens after the optical lens 115 is pressed, so as to increase the adhesive area. Even if the second adhesive part s2 contacts the sealing ring, the second adhesive part s2 can also resist high-temperature extrusion deformation.

[0067] The glass transition temperature (Tg) of the first adhesive part s1 is less than the glass transition temperature of the second adhesive part s1; and the glass transition temperature of the second adhesive part is greater than the working temperature of the laser.

[0068] The glass transition temperature (Tg) is a critical temperature at which a high polymer material changes from a rigid "glass state" to a soft "rubber state". Below Tg, the material is rigid and has strong pressure resistance; when Tg is exceeded, the material becomes soft, the elasticity increases, but the mechanical strength significantly decreases.

[0069] The second adhesive part has the characteristics of high Tg and high hardness, and the Tg of the second adhesive part s2 is higher than the upper limit of the working temperature of the laser projection system. The working temperature of the laser projection system is about 65-85°C. Therefore, the Tg of the second adhesive part s2 needs to be greater than 85°C, and is preferably 90-120°C. The hardness of the second adhesive part s2 can be D65-D80. The Tg and hardness of the second adhesive part s2 are set in the above range, so that even if the temperature inside the laser reaches 85°C, the glass state can still be maintained, the rigidity is strong, the extrusion deformation of the sealing ring can be resisted, and the fixed position of the optical lens can be maintained.

[0070] The Tg of the first adhesive part s1 is less than that of the second adhesive part, and the hardness is also less than that of the second adhesive part. The hardness of the first adhesive part s1 can be D40-D60, and is preferably D50. The first adhesive part s1 has a wide transition temperature range from the glass state to the rubber state, can absorb stress through elastic deformation when the temperature changes, and can avoid cracking or falling off of the colloid due to thermal expansion and contraction. The flexibility of the first adhesive part s1 buffers the stress generated by temperature cycling, prevents the adhesive interface from failing due to brittle failure, and improves long-term reliability.

[0071] Meanwhile, the thermal expansion coefficient of the first adhesive part s1 can be less than 70ppm / °C. The coefficient of thermal expansion (CTE) is a physical quantity that measures the size change of a material when the temperature changes. The larger the CTE, the more significant the expansion of the material when heated. If the CTE of the two connecting materials differs too much, temperature changes will cause interface stress accumulation, leading to cracking, deformation or debonding. Therefore, when selecting the materials of the first adhesive part s1 and the second adhesive part s2, the CTE needs to be matched with that of the laser material.

[0072] The CTE of the first adhesive part s1 needs to be matched with that of the second adhesive part s2. This is because in the laser provided in the embodiments of the present application, the first adhesive part s1 and the second adhesive part s2 jointly bear the adhesive function, and if the CTE of the two differs too much, the expansion amount of the two will differ in the high-temperature state, which will cause shear stress at the interface and cause the colloid to crack or debond.

[0073] Meanwhile, the CTE of the first adhesive part s1 also needs to be matched with the CTE of the materials of the laser tube shell 111 and the optical lens 115, so as to avoid the problem of separation of the colloid from the tube shell / optical lens interface or stress concentration caused by temperature cycling.

[0074] As Figure 1 and Figure 7As shown, the optical lens 115 generally needs to be arranged according to the arrangement of the light emitting components 112, and generally, the light emitting components 112 are arranged in an array, and the optical lens 115 can include a plurality of lens units arranged in a matrix. In the embodiment of the present application, the first adhesive portion s1 can be arranged in a strip shape, and the strip-shaped adhesive portion is arranged parallel to the long side of the lens unit matrix, and the length of the strip-shaped adhesive portion is greater than or equal to the length of the long side of the lens unit matrix.

[0075] The first adhesive portion s1 is arranged in a strip shape along the long side of the lens unit matrix, which can increase the contact area of the first adhesive portion s1 with the tube shell and the optical lens, and improve the adhesion strength and uniformity of the first adhesive portion s1. At the same time, the long strip-shaped first adhesive portion s1 can uniformly disperse the stress generated by temperature cycling or mechanical extrusion, avoiding local stress concentration leading to cracking or debonding of the glue layer. The long strip-shaped first adhesive portion s1 can also effectively limit the range of glue overflow, avoid contact with the sealant, and maintain the stability of the sealing structure. Moreover, the long strip-shaped first adhesive portion can use a continuous dispensing process, which is easier to control precision and reduce process complexity.

[0076] The laser shown in the drawings of the present application includes two rows of multiple columns of lens units, and therefore the first adhesive portion is arranged along the row direction. In some embodiments, if the arrangement of the light emitting components in the laser changes, the optical lens includes a 4x7 lens unit matrix, for example, and the lens unit matrix has a greater length along the column direction, and therefore for such a laser, the first adhesive portion can be arranged along the column direction.

[0077] Based on the same inventive concept, the embodiment of the present application also provides a projection system, such as Figure 8 As shown, the projection system includes a laser light source 1, an illumination light path 2, and a lens 3.

[0078] The laser light source 1 is used to emit a projection light beam, and includes any of the above lasers 11. The laser light source 1 can use a laser that can emit multiple colors of laser light or multiple lasers that emit different colors of laser light.

[0079] When the laser light source uses a monochromatic laser, a wavelength conversion device (such as a fluorescent wheel) and a color wheel need to be arranged in the projection light source for color conversion. The monochromatic laser cooperates with the wavelength conversion device and the color wheel to achieve the purpose of emitting different color primary light in time sequence. When the laser light source uses a laser that can emit multiple colors of laser light, the laser light source needs to be controlled to emit different colors of laser light as primary light in time sequence.

[0080] When the laser that can emit three primary color lasers is used, a light combination component group needs to be arranged on the light emitting side of the laser, and the light combination component group is used to combine the three color lasers. According to different arrangement modes of the light emitting assemblies in the laser, the structure and function of the light combination component group are also different.

[0081] The embodiment of the present application takes the laser that can emit three primary color lasers as an example to illustrate the light combination mode of the laser.

[0082] As shown in Figure 1 and Figure 7 , the laser can include two rows of light emitting assemblies, and the two rows of light emitting assemblies include three kinds of laser chips, which are a first laser chip emitting red laser, a second laser chip emitting green laser and a third laser chip emitting blue laser. Among them, the first laser chip is arranged in a row, and the second laser chip and the third laser chip are arranged in a row.

[0083] As shown in Figure 9 , in order to combine the three color lasers, the light combination component group 12 can include a first light combination component 121 and a second light combination component 122, the first light combination component 121 is located on the light emitting side of the second laser chip and the third laser chip, and the second light combination component 122 is located on the light emitting side of the first laser chip. The first light combination component 121 reflects the green laser g emitted by the second laser chip and the blue laser b emitted by the third laser chip to the second light combination component 122, and the second light combination component 122 transmits the green laser g emitted by the second laser chip and the blue laser b emitted by the third laser chip, and reflects the red laser r emitted by the first laser chip at the same time, so as to combine the three color lasers.

[0084] When the arrangement rule of the laser chip in the laser 11 changes, the number, setting position and function of the light combination component will also change accordingly, which is not limited here.

[0085] As shown in Figure 10 , the laser light source can also be provided with a condenser lens 13, and the condenser lens 13 can converge the laser emitted by the laser, so as to make the spot size more matched with the subsequent optical device.

[0086] The condenser lens 13 can include one or more lenses, if the condenser lens 13 includes only one lens, a convex lens is generally used; when including multiple lenses, a combination of convex lenses and / or concave lenses can be used, which is not limited here.

[0087] As shown in Figure 8 , the illumination light path 2 can include a light homogenizing element 21, a shaping element 22, a display element 23 and a light splitting element 24.

[0088] In specific implementation, as shown in Figure 8As shown, the light homogenizing element 21 can be a light pipe; alternatively, the light homogenizing element 21 can also be a compound eye lens.

[0089] The light pipe is usually made of high-transmittance material, and its cross section can be rectangular, cylindrical or hexagonal. The cross section shape of the light pipe is usually the same as the shape of the effective area of the display element 23. The inner wall surface of the light pipe is polished or coated, and light is guided by total internal reflection or specular reflection. Light is reflected multiple times in the inner wall of the pipe, and light of different angles is mixed during transmission, reducing spatial and angular non-uniformity. By extending the optical path, the energy distribution of the light beam is more uniform.

[0090] The compound eye lens is composed of two identical micro-lens arrays, each of which contains dozens to hundreds of micro-lenses. The micro-lenses are usually square or hexagonal and are arranged in a grid or honeycomb structure. The micro-lenses of the front and rear micro-lens arrays correspond one-to-one, forming an integration channel. The front lens array divides the incident light into multiple sub-beams, and each sub-beam is imaged on the target surface (such as the light entrance surface of the display element 23) by the rear lens array. The light intensity distribution of different sub-beams is superimposed on each other, and statistical averaging is performed to achieve uniformity. By adjusting the focal length and pitch of the micro-lenses, the divergence angle and uniformity of the output light field can be controlled.

[0091] The compound eye lens eliminates local light intensity differences through integration effect and is suitable for scenarios with high precision uniformity requirements. By designing the micro-lens parameters, the spot shape, size and uniformity can be optimized. The light pipe is suitable for scenarios sensitive to volume and cost, and the compound eye lens is more suitable for scenarios with high uniformity requirements and good collimation of the light source. In actual applications, the light homogenizing element 21 can be selected according to the specific application scenario, which is not limited here.

[0092] The shaping element 22 can be located on the light exit side of the light homogenizing element 21. The shaping element 22 can include multiple lenses for adjusting the size of the laser spot, so that the laser spot is focused on the light entrance surface of the display element 23 with a suitable size, achieving the best utilization efficiency.

[0093] The display element 23 is located on the light exit side of the shaping element 22, and is used to modulate the projection light beam emitted by the laser light source to form an image light beam.

[0094] In some embodiments, the display element 23 can adopt a digital micromirror (Digital Micromirror Device, DMD), a liquid crystal on silicon (Liquid Crystal on Silicon, LCoS) or a liquid crystal panel (Liquid Crystal Display, LCD).

[0095] The embodiment of the present application takes DMD as an example, the surface of the DMD includes a plurality of micro mirrors, each of which can be driven to deflect individually, and the brightness of the outgoing light of the display element 23 is controlled by controlling the deflection angle of the DMD.

[0096] The light splitting element 24 is used to separate the illumination light beam and the imaging light beam, and is located between the display element 23 and the lens 3. The laser light beam emitted by the laser light source 1 passes through the shaping and homogenization process and is finally reflected by the light splitting element 24 to the display element 23, and the image light beam emitted after being modulated by the display element 23 can pass through the light splitting element 24 and be incident on the projection lens 3.

[0097] The light splitting element 24 can adopt a light splitting prism or a total reflection prism, which is not limited here.

[0098] The lens 3 is located on the light emitting side of the display element 23, and projects and images the image light beam emitted by the display element 23.

[0099] The lens 3 usually includes a plurality of lenses, and the surface type, number and focal length of the lenses can be specifically optically designed according to the application scene of the projection system and the projection ratio, which is not limited here.

[0100] The laser and the projection system provided by the embodiment of the present application include: a tube shell forming a containing space; a plurality of light emitting assemblies located in the containing space; a cover plate located on the tube shell and sealing the tube shell; a sealing ring located around the tube shell and the cover plate; the sealing ring extruding around the tube shell and the cover plate to seal the laser; and an optical lens fixed on the cover plate through a first adhesive part and a second adhesive part. The first adhesive part and the second adhesive part are two kinds of glue with different hardness. The glue with greater hardness has greater rigidity, and thus is not easy to deform in a high temperature environment, and even if extruded by the sealing ring, the position of the optical lens can remain unchanged; and the glue with smaller hardness has the characteristics of flexibility and buffering, can better adapt to temperature cycle changes, avoids the problems of cracking and falling after temperature cycle experiments, and is beneficial to the long-term reliability of the laser. Through the combination of the two kinds of glue with different hardness, the laser can resist extrusion deformation under high temperature conditions and meet the requirement standards of the laser in severe temperature cycle experiments.

[0101] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications to the embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including all changes and modifications of the preferred embodiments and falling within the scope of the present application.

[0102] Obviously, many modifications and variations of the present application are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. A laser, characterized by, The application relates to a laser projector, comprising: a tube shell, which comprises a bottom plate and a side wall, and forms a containing space; a plurality of light-emitting assemblies located in the containing space; a cover plate located on the tube shell and sealed with the tube shell; a sealing ring located around the tube shell and the cover plate; the sealing ring is pressed around the tube shell and the cover plate; and an optical lens located on the cover plate; wherein the optical lens is fixed on the cover plate through a first adhesive part and a second adhesive part; the first adhesive part and the second adhesive part have different hardness.

2. The laser of claim 1, wherein, The first adhesive part is located at the edge of the optical lens, and the first adhesive part does not contact the sealing ring; the second adhesive part is located at the corner of the optical lens, and the second adhesive part contacts the sealing ring; the hardness of the first adhesive part is less than that of the second adhesive part.

3. The laser of claim 2, wherein, The glass transition temperature of the first adhesive part is less than that of the second adhesive part; the glass transition temperature of the second adhesive part is greater than the working temperature of the laser.

4. The laser of claim 2, wherein, The first adhesive part is located between the optical lens and the cover plate, and the edge of the first adhesive part does not exceed the edge of the optical lens.

5. The laser of claim 4, wherein, The optical lens comprises a plurality of lens units arranged in a lens unit matrix; the first adhesive part is a strip-shaped adhesive part, which is arranged parallel to the long side of the lens unit matrix, and the length of the strip-shaped adhesive part is greater than or equal to the length of the long side of the lens unit matrix.

6. The laser of claim 2, wherein, The second adhesive part is located between the optical lens and the cover plate, and the edge of the second adhesive part exceeds the edge of the optical lens.

7. The laser of any of claims 1-6, wherein, The hardness of the first adhesive part is D40-D60; and the hardness of the second adhesive part is D65-D80.

8. The laser of claim 7, wherein, The thermal expansion coefficient of the first adhesive part is less than 70ppm / deg.

9. The laser of claim 3, wherein, The glass transition temperature of the second adhesive part is greater than 85 DEG C.

10. A projection system, characterized by The application relates to a laser projector, comprising: a laser light source for emitting a projection light beam; the laser light source comprises the laser as claimed in any one of claims 1-9; a display element located on the light-emitting side of the laser light source, and used for modulating the projection light beam emitted by the laser light source to form an image light beam; and a lens located on the light-emitting side of the display element, and used for projecting and imaging the image light beam.

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