High-temperature-resistant diaphragm anti-dazzling screen, automatic aperture and laser projector

Abstract

The invention discloses a high-temperature-resistant diaphragm anti-dazzling screen which comprises a substrate made of a stainless steel material, and at least one surface of the substrate is directly provided with a Ni-type oxide layer through a sputtering method. Compared with a current mode that a resin substrate is plated with a nickel-like oxide layer, the laser projector has better heat resistance and wear resistance, the current laser projector can be used in an ultra-long time, the optical performance is kept stable, and cost increase caused by providing an extra heat dissipation part is not needed. And the condition that the laser projector can only be used under the limited conditions of good ventilation or discontinuous use and the like is not needed.

Description

Technical Field

[0001] The invention relates to the technical field of apertures, and in particular to a high temperature resistant aperture shading sheet, an automatic aperture and a laser projector. Background Art

[0002] Laser projectors use lasers as light sources, which generate a lot of heat when working. This heat will be transferred to the lens through the internal structure of the projection system and air flow; the modulator (such as DMD chip or LCD panel) and electronic drive and control circuits in the laser projector will also generate heat when working, and this heat will also be transferred to the lens through the internal structure and air flow; in addition, if the laser projector works in a high temperature environment for a long time, or the device has poor heat dissipation, it will also cause the lens temperature to rise.

[0003] The above reasons will cause the lens to heat up. When the temperature is too high, the aperture blades in the lens may soften, deform, or change color, which may cause the actuation function to fail.

[0004] At present, in order to protect the performance of the lens and aperture, laser projectors usually adopt efficient heat dissipation design and temperature control strategies to ensure that the equipment operates within the normal operating temperature range, or users keep the equipment well ventilated when using the laser projector and avoid long-term continuous use to reduce the risk of heating and damage to the equipment.

[0005] However, the above-mentioned solutions for protecting the aperture blades either increase the cost and energy consumption of the entire aperture and even the laser projector by adding additional structures, or reduce the use time of the laser projector itself and turn on the external cooling system, which limits the scope of application. They do not truly solve the technical problem that the laser projector cannot be used for a long time by improving the heat resistance of the aperture.

[0006] Therefore, in order to solve the current limitations of the use of apertures in laser projectors, the present application proposes a high-temperature resistant aperture shade, an automatic aperture and a laser projector. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings existing in the prior art, and the proposed high-temperature resistant aperture shade, automatic aperture and laser projector have better heat resistance and wear resistance than the current method of plating a nickel-type oxide layer on a resin substrate, which can meet the requirements that the current laser projector can be used for an extremely long time while maintaining stable optical performance, and there is no need to provide additional heat dissipation components to increase costs, nor is there a need to limit the use of the laser projector to restricted conditions such as good ventilation or intermittent use.

[0008] In order to achieve the above object, the present invention provides the following technical solutions: The high temperature resistant aperture shading sheet comprises a substrate made of metal material, at least one side of the substrate is directly formed with a Ni-type oxide layer by sputtering.

[0009] The above structure has better heat resistance and wear resistance than the current method of plating a nickel-type oxide layer on a resin substrate, which can meet the requirements that the current laser projector can be used for an extremely long time while maintaining stable optical performance. There is no need to provide additional heat dissipation components to increase costs, and there is no need to limit the use of laser projectors to restricted conditions such as good ventilation or intermittent use.

[0010] Preferably, both sides of the substrate are sputtered.

[0011] Preferably, the substrate is further subjected to a frosting treatment before the sputtering treatment.

[0012] Preferably, the average surface roughness Ra of the substrate is 1-1.5 μm.

[0013] Preferably, the thickness of the substrate is 20-150 μm.

[0014] Preferably, the thickness of the Ni-based oxide layer is 40-60 nm.

[0015] Preferably, the metal material of the substrate is one of SUS304 stainless steel and aluminum alloy.

[0016] Through the above structure, a shading sheet that is more suitable for large laser projectors is constructed. It can maintain stability for a long time in a high temperature environment, will not age or deform, and also has good shading properties, wear resistance and high strength, further ensuring that the shading sheet can still maintain excellent optical properties after long-term and multiple uses in a high temperature environment.

[0017] In order to achieve the above object, the present invention also provides the following technical solutions: The automatic aperture comprises the above-mentioned shading sheet and further comprises: A shell, wherein the plurality of light shielding sheets are rotatably connected to the circular shell and are distributed in the shell in an annular shape, and a light-transmitting window is provided in the middle of the shell; A driving disk, the driving disk is rotatably connected to the housing, and when the driving disk rotates, it drives the eccentric shaft on the shading sheet to move so as to drive all the shading sheets to rotate; A power unit, which drives the driving disc to rotate when the power unit is running; All the shading sheets form light-transmitting holes at the light-transmitting windows, and the shading sheets are rotatably connected to one side of the outer ring close to the shell through a rotating shaft.

[0018] Through the above structure, the technical solution provides an automatic aperture that is more suitable for large laser projectors and can maintain stable optical performance for a long time in a high temperature environment.

[0019] Preferably, four shading sheets are provided.

[0020] Preferably, the driving disc is provided with a driving opening matched with the eccentric shaft, and the driving opening is strip-shaped and the length direction is not aligned with the tangent direction of the eccentric shaft when it moves.

[0021] Preferably, the shell includes a bottom shell and a shell cover, the inner wall of the bottom shell is provided with a step lower than the top surface of the bottom shell, the inner wall of the bottom shell is also provided with a screw hole with the inner side exposed to the inner wall of the step, and the shell cover is fixedly connected to the screw hole by screws, and the outer wall of the drive disk is provided with a limiting ear protruding outward and cooperating with the step.

[0022] Through the above structure, the connection structure between the bottom shell and the shell cover is used as a limiting structure for aperture adjustment, which also makes the adjustment of the aperture more stable, and the structural design is very ingenious.

[0023] Preferably, the power unit includes a motor and a gear on the motor shaft head, and a rack matching the gear is also provided on the outer wall of the driving disk.

[0024] Preferably, the diameter of the rack is smaller than the outer wall diameter of the driving disc.

[0025] Preferably, a first convex strip is provided on the surface of the driving disk close to the shading sheet, and the first convex strip connects the inner middle hole and the outer wall of the driving disk.

[0026] Preferably, a third convex strip is provided on the surface of the bottom shell close to the shading sheet, and the third convex strip connects the inner middle hole and the outer wall of the bottom shell.

[0027] Preferably, a second convex strip is provided on the surface of the driving disc close to the shell cover, and the second convex strip is circular and is disconnected at all driving openings.

[0028] Through the above structure, the wear of the shading plate and the driving disk during rotation can be greatly reduced, the service life of the entire aperture can be extended, and it can also ensure that the surface of the shading plate is not prone to scratches after long-term use, thereby affecting the optical performance.

[0029] Preferably, an arc-shaped limiting groove is provided on the bottom shell, and a limiting block which can extend into the limiting groove is provided on the surface of the driving disk close to the bottom shell.

[0030] Preferably, the bottom shell is provided with a detection mechanism installed in the limit groove, the detection mechanism includes a U-shaped insert and a beam detection module on the inner walls on both sides of the insert, and the electric signal is triggered when the limit block passes through the beam detection module.

[0031] The above structure not only provides additional protection for the normal adjustment of the automatic aperture, but also can detect the adjustment status of the automatic aperture in real time.

[0032] In order to achieve the above object, the present invention also provides the following technical solutions: A laser projector comprises the automatic aperture as described above, wherein the automatic aperture is arranged in the lens of the laser projector.

[0033] Through the above structure, a laser projector is provided that can maintain stable optical performance for a long time in a high temperature environment, and there is no need to provide additional heat dissipation components to increase costs, nor is there a need to limit the use of the laser projector to restricted conditions such as good ventilation or intermittent use.

[0034] Compared with the prior art, the present invention has the following beneficial effects: compared with the current method of plating a nickel-type oxide layer on a resin substrate, the present invention has better heat resistance and wear resistance, and can meet the requirements that the current laser projector can be used for an extremely long time while maintaining stable optical performance, and there is no need to provide additional heat dissipation components to increase costs, nor is there a need to limit the use of laser projectors to restricted conditions such as good ventilation or intermittent use. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the structure of the high temperature resistant aperture shading sheet proposed by the present invention; Figure 2 This is a schematic diagram of the three-dimensional assembly structure of the automatic aperture proposed by the present invention; Figure 3 This is a schematic diagram of the exploded structure of the automatic aperture proposed by the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the bottom shell and the driving disk of the automatic aperture proposed by the present invention; Figure 5 This is a schematic diagram of the three-dimensional structure of the bottom shell and the driving disk in another perspective of the automatic aperture proposed by the present invention.

[0036] In the figure: 1. shading sheet; 11. substrate; 12. oxide layer; 13. light-transmitting hole; 14. eccentric shaft; 15. rotating shaft; 2. Shell; 21. Light-transmitting window; 22. Bottom shell; 221. Step; 222. Screw hole; 223. Limiting groove; 2231. Detection mechanism; 22311. Insert block; 22312. Through-beam detection module; 23. Shell cover; 24. Screw; 3. driving plate; 30. driving port; 31. limiting ear; 32. rack; 33. first convex strip; 34. third convex strip; 35. second convex strip; 36. limiting block; 4. Power unit; 41. Motor; 42. Gear. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Embodiment 1: See also Figure 1 The present invention provides the following technical solution: a high temperature resistant aperture shading sheet, comprising a substrate 11 made of SUS304 stainless steel material, at least one side of the substrate 11 is directly formed with a Ni-based oxide layer 12 by sputtering.

[0039] As an optional implementation scheme of the present invention, a Ni-based oxide layer 12 is directly formed on a substrate 11 made of SUS304 stainless steel material by sputtering, so that the heat resistance and wear resistance of the entire substrate 11 are higher than the current method of plating a nickel-based oxide layer on a resin substrate. It can withstand 1 million uses at a high temperature of at least 300°C without deformation, aging, or softening, and has very low volatility. It will not fail to function properly due to increased temperature, resulting in reduced shading properties. This allows current laser projectors to be used for an extended period of time, and there is no need to provide additional heat dissipation components to increase costs, nor is there a need to limit the use of laser projectors to restricted conditions such as good ventilation or intermittent use. This is suitable for the application of laser projectors in multiple fields such as theaters, squares, vehicles, homes, and enterprises, and is conducive to the development of laser projectors.

[0040] The above structure has better heat resistance and wear resistance than the current method of plating a nickel-type oxide layer on a resin substrate, which can meet the requirements that the current laser projector can be used for an extremely long time while maintaining stable optical performance. There is no need to provide additional heat dissipation components to increase costs, and there is no need to limit the use of laser projectors to restricted conditions such as good ventilation or intermittent use.

[0041] Furthermore, the substrate 11 is subjected to a frosting treatment before the sputtering treatment, the average surface roughness Ra of the substrate 11 is 1-1.5 μm, the thickness of the substrate 11 is 20-150 μm, and the thickness of the Ni-based oxide layer 12 is 40-60 nm.

[0042] As an optional implementation scheme of the present invention, the high temperature resistance limit of SUS304 stainless steel is 800 degrees, so it has high heat resistance, so that the substrate 11 can maintain stability for a long time in the high temperature environment of the laser projector lens, and will not age or deform. In addition, SUS304 stainless steel also has good wear resistance and high strength, and it is difficult to produce scratches on the surface, ensuring that it is difficult to affect the optical performance of the lens within 1 million times of use; the substrate 11 after frosting can obtain more suitable sliding performance, low gloss and low reflectivity.

[0043] Among them, as to the thickness of the substrate 11, since the laser projectors that need to be used for a long time are usually relatively large, the laser parameters and lens specifications are generally large. Therefore, if the thickness of the substrate 11 is too thin, the strength is insufficient. Therefore, a substrate 11 with a thickness of 20-150μm can basically meet the use of various common laser projectors currently. As for the thickness of the Ni-based oxide layer 12, the reason is similar to that of the above-mentioned thickness of the substrate 11. Especially for metal substrates, if the Ni oxide layer 12 is too thin, it is easy to be difficult to meet sufficient light-shielding properties. Therefore, a Ni-based oxide layer 12 with a thickness of 40-60nm is selected in combination with the SUS304 stainless steel substrate 11 of the above-mentioned thickness to make the entire light-shielding sheet 1 more suitable for use in various common laser projectors currently, especially large laser projectors.

[0044] Through the above structure, a shading sheet 1 which is more suitable for use in large laser projectors is constructed. It can maintain stability for a long time in a high temperature environment, will not age or deform, and also has relatively good shading properties, wear resistance and high strength, further ensuring that the shading sheet 1 can still maintain excellent optical properties after being used multiple times for a long time in a high temperature environment.

[0045] Embodiment 2: See also Figure 1 The present invention provides the following technical solution: a high temperature resistant aperture shading sheet, comprising a substrate 11 made of aluminum alloy, at least one side of the substrate 11 is directly formed with a Ni-based oxide layer 12 by sputtering, the substrate 11 also includes a frosting treatment before the sputtering treatment, the average surface roughness Ra of the substrate 11 is 1-1.5μm, the thickness of the substrate 11 is 20-150μm, and the thickness of the Ni-based oxide layer 12 is 40-60nm.

[0046] As an optional implementation scheme of the present invention, aluminum alloy not only has excellent high temperature resistance, aging resistance, wear resistance and higher strength than SUS304 stainless steel material, but also has a smoother surface and is easier to anodize and color, which provides convenience for subsequent processing and surface treatment, and the processing cost is relatively low; and aluminum alloy is non-magnetic, and the surface is relatively dull and does not reflect light.

[0047] Embodiment 3: See also Figure 2-5 In order to achieve the above object, the present invention also provides the following technical solutions: The automatic aperture comprises the light shielding sheet 1 in embodiment 1 or embodiment 2, and further comprises: The housing 2, a plurality of light shielding sheets 1 are rotatably connected to the circular housing 2 and are distributed in the housing 2 in an annular shape. A light-transmitting window 21 is provided in the middle of the housing 2; A driving disk 3 is rotatably connected to the housing 2. When the driving disk 3 rotates, it drives the eccentric shaft 14 on the shading sheet 1 to move so as to drive all the shading sheets 1 to rotate; A power unit 4, which drives the driving disc 3 to rotate when the power unit 4 is running; All the light shielding sheets 1 form light transmission holes 13 at the light transmission windows 21 , and the light shielding sheets 1 are rotatably connected to a side of the outer ring close to the housing 2 via a rotating shaft 15 .

[0048] As an optional implementation scheme of the present invention, the laser enters the automatic aperture from the light-transmitting window 21 and is emitted from the lens of the laser projector through the light-transmitting hole 13. When the power unit 4 is running, the driving disk 3 is driven to rotate, thereby driving the eccentric shaft 14 on the light-shielding sheet 1 to rotate, so that all the light-shielding sheets 1 rotate synchronously, thereby changing the diameter of the light-transmitting hole 13. In this technical solution, the number of light-shielding sheets 1 is not limited.

[0049] Through the above structure, the technical solution provides an automatic aperture that is more suitable for large laser projectors and can maintain stable optical performance for a long time in a high temperature environment.

[0050] like Figure 2-5 As shown, the driving disc 3 is provided with a driving opening 30 that matches the eccentric shaft 14 . The driving opening 30 is strip-shaped and its length direction is not aligned with the tangential direction of the eccentric shaft 14 when it moves.

[0051] As an optional implementation scheme of the present invention, when the driving disk 3 rotates, the eccentric shaft 14 is driven by the driving opening 30 and slides in the driving opening 30, thereby realizing the rotation of the shading sheet 1.

[0052] like Figure 3-5 As shown, the shell 2 includes a bottom shell 22 and a shell cover 23. The inner wall of the bottom shell 22 is provided with a step 221 lower than the top surface of the bottom shell 22. The inner wall of the bottom shell 22 is also provided with a screw hole 222 whose inner side is exposed to the inner wall of the step 221. The shell cover 23 is fixedly connected to the screw hole 222 by a screw 24. The outer wall of the drive disk 3 is provided with a limiting ear 31 protruding outward and cooperating with the step 221.

[0053] As an optional implementation scheme of the present invention, when the driving disk 3 rotates, the limiting ear 31 slides on the inner wall of the bottom shell 22, so that the rotation of the driving disk 3 in the shell 2 is more stable, and the limiting ear 31 can be blocked by the screw hole 222 to limit the rotation angle of the driving disk 3 to a suitable range, so as to prevent the driving disk 3 from rotating too much and causing the shading sheet 1 to be stretched and damaged or scrapped. Therefore, through the design of the screw hole 222 and the limiting ear 31, the connection structure between the bottom shell 22 and the shell cover 23 can be cleverly used as a limiting structure for aperture adjustment, which also makes the adjustment of the aperture smoother.

[0054] Through the above structure, the connection structure between the bottom shell 22 and the shell cover 23 is used as a limiting structure for aperture adjustment, which also makes the adjustment of the aperture more stable, and the structural design is very ingenious.

[0055] like Figure 3-5 As shown, the power unit 4 includes a motor 41 and a gear 42 on the shaft head of the motor 41 , and a rack 32 matched with the gear 42 is also provided on the outer wall of the driving disk 3 , and the diameter of the rack 32 is smaller than the diameter of the outer wall of the driving disk 3 .

[0056] As an optional embodiment of the present invention, when the motor 41 rotates, the gear 42 drives the driving disk 3 to rotate. The rack 32 having a diameter smaller than the outer wall diameter of the driving disk 3 can not only provide the gear 42 with an installation space in the housing 2, but also prevent the gear 42 from driving the driving disk 3 to rotate when the two ends of the rack 32 are in contact, so it also has a certain limiting effect, preventing the driving disk 3 from rotating too much and causing the shading sheet 1 to be damaged or scrapped due to excessive tensile force.

[0057] like Figure 3-5 As shown, a first ridge 33 is provided on the surface of the driving disk 3 close to the shading plate 1, and the first ridge 33 connects the inner center hole and the outer wall of the driving disk 3, a third ridge 34 is provided on the surface of the bottom shell 22 close to the shading plate 1, and the third ridge 34 connects the inner center hole and the outer wall of the bottom shell 22, and a second ridge 35 is provided on the surface of the driving disk 3 close to the shell cover 23, and the second ridge 35 is circular.

[0058] As an optional implementation scheme of the present invention, the first ridge 33 and the third ridge 34 are used to support the two surfaces of the shading sheet 1, and since the rotation of each shading sheet 1 is independent, the multiple first ridges 33 and the third ridges 34 respectively maintain support for the shading sheet 1 within the rotation range of each shading sheet 1, reducing the contact area between the shading sheet 1 and the surface of the drive disk 3, thereby reducing the wear on the surface of the shading sheet 1, and the second ridge 35 is used to reduce the wear between the drive disk 3 and the shell cover 23, and maintain the axial stability of the drive disk 3 during rotation.

[0059] The above structure can significantly reduce the wear of the shading sheet 1 and the driving disk 3 during rotation, extend the service life of the entire aperture, and ensure that the surface of the shading sheet 1 is not prone to scratches after long-term use, thereby affecting the optical performance.

[0060] like Figure 3-5 As shown, an arc-shaped limit groove 223 is provided on the bottom shell 22, and a limit block 36 that can extend into the limit groove 223 is provided on the surface of the driving disk 3 close to the bottom shell 22. A detection mechanism 2231 installed in the limit groove 223 is provided on the bottom shell 22. The detection mechanism 2231 includes a U-shaped insert 22311 and a beam detection module 22312 on the inner walls on both sides of the insert 22311. When the limit block 36 passes through the beam detection module 22312, an electrical signal is triggered.

[0061] As an optional implementation scheme of the present invention, the arc-shaped limit groove 223 limits the maximum rotation angle of the drive disk 3. The limit groove 223 cooperates with the limit block 36, and the design of the limit ear and the screw hole 222 provides a double limit guarantee for the rotation of the drive disk 3, thereby avoiding the situation where the shading plate 1 is stretched and damaged to a great extent.

[0062] The through-beam detection module 22312 can be constructed in the form of an infrared transmitting module and an infrared receiving module. When the limit block 36 blocks the infrared rays, it can be detected by the infrared receiving module, thereby sending out an electrical signal. The detection mechanism 2231 can detect the adjustment status of the automatic aperture through the through-beam detection module 22312; technical personnel in this field can also directly set a plurality of through-beam detection modules 22312 in the limit slot 223. The embedded block 22311 in the above technical scheme is mainly set to facilitate wiring.

[0063] The above structure not only provides additional protection for the normal adjustment of the automatic aperture, but also can detect the adjustment status of the automatic aperture in real time.

[0064] Embodiment 4: The present invention also provides the following technical solution: A laser projector comprises the automatic aperture as described above, wherein the automatic aperture is arranged in the lens of the laser projector.

[0065] As an optional embodiment of the present invention, a laser projector is provided that can maintain stable optical performance for a long time in a high-temperature environment, without the need to provide additional heat dissipation components to increase costs, and without the need to limit the use of the laser projector to restricted conditions such as good ventilation or intermittent use.

[0066] The working principle and use process of the present invention: when the motor 41 rotates, the gear 42 drives the driving disk 3 to rotate, and the eccentric shaft 14 is driven by the driving port 30 and slides in the driving port 30, so that all the light shielding sheets 1 rotate synchronously, thereby changing the diameter of the light transmission hole 13. When the laser projector is working, the light source will generate a lot of heat. The heat will be conducted to the lens through the internal structure of the projection system and the air flow, thereby increasing the temperature of the shading film 1. The shading film 1 in the laser projector is a Ni-based oxide layer 12 formed directly on a substrate 11 made of stainless steel by sputtering, so that the heat resistance of the entire shading film 1 is improved, and it can withstand 1 million uses at a high temperature of at least 300°C without deformation or aging, and there will be no problem of reduced shading due to temperature increase. The current laser projector can be used for an extremely long time, and there is no need to provide additional heat dissipation components to increase costs, nor is there a need to limit the use of the laser projector to restricted conditions such as good ventilation or intermittent use. It is suitable for the application of laser projectors in theaters, squares, vehicles, homes, enterprises and other fields, and is conducive to the development of laser projectors.

[0067] Experimental Example 1: The high temperature resistant aperture shielding sheets of Example 1 and Example 2 are respectively used for the automatic aperture of Example 3 and assembled into the laser projector of Example 4. Meanwhile, an existing nickel-plated resin substrate is used as a comparative example. Before the experiment, all substrates have the same thickness and roughness, and are all carried out at 300°C. The following experimental data are obtained: Table 1: Usage data of the aperture shield made of the SUS304 stainless steel material as the substrate in Example 1:

[0068] Table 2: Usage data of the aperture shield made of the aluminum alloy material in Example 2 as the substrate:

[0069] Table 3: Usage data of the aperture shielding sheet made of the nickel-plated resin substrate in the comparative example as the substrate:

[0070] Among them: The number of uses refers to the number of times the aperture is adjusted, opening and then closing is counted as one time.

[0071] It can be seen that the aperture shade sheets made of metal substrates in Examples 1-2 can withstand 1 million uses at a high temperature of 300°C without deformation, aging, and providing normal light transmittance, while the existing aperture shade sheets with nickel-plated resin substrates as substrates have reached a roughness of more than 0.2 mm after 500,000 uses, and the substrate itself is burnt, discolored, and has holes, and has completely lost its optical properties.

[0072] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high temperature resistant aperture shading sheet, comprising a substrate made of a metal material, characterized in that: A Ni-based oxide layer is directly formed on at least one side of the substrate by sputtering.

2. The high temperature resistant aperture shading sheet according to claim 1, characterized in that: The substrate also includes a frosting process before the sputtering process.

3. The high temperature resistant aperture shading sheet according to claim 2, characterized in that: The average surface roughness Ra of the substrate is 1-1.5 μm.

4. The high temperature resistant aperture shading sheet according to claim 1, characterized in that: The thickness of the substrate is 20-150 μm.

5. The high temperature resistant aperture shading sheet according to claim 1, characterized in that: The thickness of the Ni-based oxide layer is 40-60 nm.

6. The high temperature resistant aperture shading sheet according to claim 1, characterized in that: The metal material of the substrate is one of SUS304 stainless steel and aluminum alloy.

7. An automatic aperture, comprising a light shielding sheet as claimed in any one of claims 1 to 6, characterized in that: Also includes: A housing, wherein a plurality of light shielding sheets are rotatably connected to the circular housing and are distributed in an annular shape in the housing, and a light-transmitting window is provided in the middle of the housing; A driving disk, the driving disk is rotatably connected to the housing, and when the driving disk rotates, it drives the eccentric shaft on the shading sheet to move so as to drive all the shading sheets to rotate; A power unit, which drives the driving disc to rotate when the power unit is running; All the light shielding sheets form light transmission holes at the light transmission windows, and the light shielding sheets are rotatably connected to one side of the outer ring close to the shell through a rotating shaft.

8. The automatic aperture according to claim 7, characterized in that: The shell body includes a bottom shell and a shell cover. The inner wall of the bottom shell is provided with a step lower than the top surface of the bottom shell. The inner wall of the bottom shell is also provided with a screw hole with the inner side exposed to the inner wall of the step. The shell cover is fixedly connected to the screw hole by screws. The outer wall of the drive disk is provided with a limiting ear protruding outward and cooperating with the step.

9. The automatic aperture according to claim 7, characterized in that: The power unit comprises a motor and a gear on the motor shaft head, and a rack matched with the gear is also arranged on the outer wall of the driving disc.

10. A laser projector, characterized in that: It comprises the automatic aperture as described in any one of claims 8-9, wherein the automatic aperture is arranged in the lens of the laser projector.

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