Large-caliber low-temperature kidney-shaped lens supporting tool and kidney-shaped lens unit

Abstract

The invention discloses a large-diameter low-temperature waist-shaped lens supporting tool and a waist-shaped lens unit, and solves the problem that a large-diameter low-temperature infrared lens is violently deformed due to a huge temperature difference between a processing and assembling environment and an actual working environment, so that the imaging quality is directly influenced. The lens supporting frame is arranged on the periphery of the kidney-shaped lens to be supported, and the 2N + 2M flexible supporting units are arranged on the inner wall of the lens supporting frame. N > = 1, M > = 1; the flexible supporting unit is composed of a bonding block and two spring type flexible sheets, the bonding block is bonded with the kidney-shaped lens to be supported, and the spring type flexible sheets provide flexible support and bear deformation and thermal stress of the kidney-shaped lens, so that the problem of severe deformation of the low-temperature kidney-shaped lens under a huge temperature difference is solved, the imaging quality of an infrared system can be improved, and the imaging quality of the infrared system is improved. And the thermal deformation of the low-temperature waist-shaped lens under a huge temperature difference is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to a low-temperature lens support tool and a waist-shaped lens unit, in particular to a large-diameter low-temperature waist-shaped lens support tool and a waist-shaped lens unit. BACKGROUND

[0002] With the continuous improvement of the application demand of infrared detection technology, the infrared cold optical technology has been rapidly developed, but the low-temperature deformation problem of the infrared optical element has become one of the key bottlenecks restricting the breakthrough of the technology. For an infrared space detection remote sensor, the material selection of the optical element and the support structure is always difficult to completely unify, and there is an inherent deviation in the thermal expansion coefficients of the two, and the deviation presents a nonlinear characteristic with temperature change; during the cooling process, the shrinkage deformation amounts of the optical element and the support structure are significantly different, so that the optical element bears a large deformation stress, which seriously affects the system stability. At the same time, the development trend of the remote sensor towards miniaturization, compactness and lightness puts higher requirements on the space utilization rate of the infrared system.

[0003] In order to maximize the space utilization rate, for a large-diameter circular lens with a diameter ranging from 50mm to 500mm, an optimization mode of invalid area cutting (i.e. cutting the two sides of the circular lens symmetrically to form two parallel straight long sides, and retaining the circular arc short sides on the two sides which are not cut to form a waist-shaped lens) is generally adopted in the field, among which the application of the waist-shaped lens is the most widespread. This lens form can not only meet the core needs of infrared optical imaging, but also can reduce the overall volume of the system to the greatest extent, which meets the light weight design goal. However, the processing and assembly procedures of the optical element and the support structure of the infrared system are completed at room temperature, while the actual working environment is an extremely low temperature field, and the temperature change range can reach 200K-300K, which puts more stringent technical requirements on the temperature adaptability of the waist-shaped lens support structure.

[0004] In view of the technical problems of large optical element surface shape change and thermal stress concentration in the above-mentioned large temperature difference environment, two types of technical solutions are currently mainly used to realize athermalization design: One is a uniformity design scheme, that is, by selecting the same material to process the optical element and the structure of the entire system, the temperature deformation difference between the optical element and the structure is avoided from the source. However, this scheme is limited by the performance difference between the optical element and the support material, and is only suitable for metal mirror reflection systems and simple systems with the same material optical element; for complex cold optical systems (especially transmission systems), since different materials must be selected for the optical element and the support structure, the applicability of this scheme is greatly limited.

[0005] The second is a degree of freedom design scheme, that is, an assembly mode of not fixedly connecting the optical element and the support structure, and the deformation stress caused by temperature change is released by designing the relative moving freedom in the axial and radial directions. However, the scheme has obvious defects for the waist-shaped lens: the boundary form of the waist-shaped lens is complex, which causes the assembly mode to be difficult to effectively install; and in order to guarantee the optical performance, the processing precision of the optical element and the support structure is extremely high, which significantly increases the processing cost and the assembly difficulty.

[0006] In summary, the two types of technical schemes cannot efficiently and conveniently solve the problem of the severe deformation of the large-aperture waist-shaped low-temperature infrared lens in the environment with a large temperature difference, and it is difficult to meet the core technical requirements of the high surface shape precision and low deformation stress of the optical and mechanical structure of the infrared cold optical system, and a more adaptable technical scheme is needed to break through the existing bottleneck. SUMMARY

[0007] In order to solve the technical problem that the large-aperture low-temperature infrared lens in the cold optical field is caused to produce severe deformation due to a large temperature difference between the processing and assembly environment and the actual working environment, and then directly affects the imaging quality, the application provides a large-aperture low-temperature waist-shaped lens support tool and a waist-shaped lens unit.

[0008] In order to achieve the above purpose, the application adopts the following technical scheme: A large-aperture low-temperature waist-shaped lens support tool, which is characterized by comprising a lens support frame for being arranged at the periphery of a waist-shaped lens to be supported and 2N+2M flexible support units arranged on the inner wall of the lens support frame; N is a positive integer greater than or equal to 1, and M is a positive integer greater than or equal to 1; The lens support frame is a waist-shaped frame, comprising two straight edge frames with equal length and parallel to each other and two circular arc edge frames symmetrically arranged at the two ends of the two straight edge frames and correspondingly connected with the two straight edge frames. Among them, the 2N flexible support units are symmetrically and uniformly distributed on the inner walls of the two straight edge frames, and the 2M flexible support units are symmetrically and uniformly distributed on the inner walls of the two circular arc edge frames. The flexible support unit comprises an adhesive block and spring-type flexible sheets arranged on both sides of the adhesive block; one end of the spring-type flexible sheet is fixedly connected with the adhesive block, and the other end is correspondingly fixedly connected with the inner wall of the straight edge frame or the circular arc edge frame; a gap is arranged between the adhesive block and the spring-type flexible sheet and the inner wall of the corresponding straight edge frame or circular arc edge frame. The adhesive surface of the adhesive block arranged at the straight edge frame is a plane, which is used for bonding with the straight edge of the waist-shaped lens to be supported; the adhesive surface of the adhesive block arranged at the circular arc edge frame is a circular arc surface, the curvature of which is consistent with and matched with the curvature of the circular arc edge of the waist-shaped lens to be supported, which is used for bonding with the circular arc edge of the waist-shaped lens to be supported. A first glue injection hole is arranged in the middle of the adhesive block. The lens support frame is provided with second glue injection holes corresponding to the first glue injection holes.

[0009] Further, the straight frame inner wall is provided with N U-shaped grooves, and the arc frame inner wall is provided with M U-shaped grooves, so that the lens support frame is provided with 2N+2M U-shaped grooves, and the 2N+2M U-shaped grooves and 2N+2M flexible support units are one-to-one corresponding. The U-shaped opening of the U-shaped groove faces the waist-shaped lens to be supported, and the connection between the two parallel side walls and the groove bottom is a circular arc transition connection. The flexible support unit is arranged in the corresponding U-shaped groove, and the two spring-type flexible pieces are respectively connected to the two parallel side walls of the corresponding U-shaped groove at the end away from the adhesive block. Each second glue injection hole is located in the middle of the bottom of the corresponding U-shaped groove. The adhesive block is bonded to the waist-shaped lens to be supported by low-temperature glue injected from the second glue injection hole and the first glue injection hole.

[0010] Further, the connection between the spring-type flexible piece and the parallel side wall of the U-shaped groove is a circular arc transition connection. The side wall of the spring-type flexible piece and the corresponding adhesive block close to the bottom of the U-shaped groove is located on the same plane, and the connection between the side wall of the spring-type flexible piece away from the bottom of the U-shaped groove and the corresponding adhesive block is a circular arc transition connection.

[0011] Further, the arc frame is provided with two flexible connection units respectively, and the two flexible connection units are arranged close to the two ends of the arc frame. The flexible connection unit comprises a connecting ring and two arc-shaped flexible pieces arranged at the two ends of the diameter of the connecting ring. The arc frame is provided with a circular through hole and two arc-shaped through holes matched with the shapes of the two arc-shaped flexible pieces, and the two arc-shaped through holes are arranged at the two ends of the diameter of the circular through hole and communicate with the circular through hole. The connecting ring is arranged in the circular through hole, and the two arc-shaped flexible pieces are arranged in the two arc-shaped through holes, one end of the arc-shaped flexible piece is connected with the connecting ring, and the other end is connected with the inner wall of the end of the arc-shaped through hole away from the circular through hole. The inner diameter of the circular through hole is greater than the outer diameter of the connecting ring, so that there is a gap between the inner wall of the circular through hole and the outer wall of the connecting ring. The arc-shaped radial width of the arc-shaped through hole is greater than the arc-shaped radial width of the arc-shaped flexible piece, so that there is a gap between the arc-shaped radial two side walls of the arc-shaped flexible piece and the arc-shaped radial two inner walls of the arc-shaped through hole. The centers of the arc-shaped flexible piece and the arc-shaped through hole correspond to the center point of the waist-shaped lens to be supported.

[0012] Furthermore, a wire-threading hole communicating with the arc-shaped through hole is provided at the end of the arc-shaped through hole away from the circular through hole; Two wire-threading holes are symmetrically arranged on both sides of the same circular through hole.

[0013] Furthermore, it also includes a lens mounting substrate disposed on the bottom surface of the lens support frame via a flexible connection unit; The lens mounting substrate has a light-transmitting hole in the middle that matches the shape of the waist-shaped lens to be supported.

[0014] Furthermore, the lens mounting base plate is provided with threaded holes that correspond one-to-one with the inner holes of each connecting ring; The lens support frame and the lens mounting base are detachably connected by screws located in the inner hole and threaded hole of the connecting ring.

[0015] Furthermore, an adjustment shim is provided between each of the arc-shaped frame and the lens mounting base; the lens mounting base is provided with a flat mounting boss for placing the adjustment shim; the screw passes through the corresponding mounting boss and adjustment shim; Each of the arc-shaped frame and the lens mounting base is positioned by a positioning pin; the positioning pin passes through the corresponding positioning holes on the arc-shaped frame and the lens mounting base.

[0016] Furthermore, the lens support frame, flexible support unit, and flexible connection unit are integrally manufactured using titanium alloy or Invar steel. The sidewall of the arc-shaped frame is provided with weight-reducing holes.

[0017] A large-aperture, low-temperature waisted lens unit, characterized by: This includes the aforementioned large-aperture low-temperature waisted lens support fixture and waisted lens; The waist-shaped lens is set inside the lens support frame and is bonded to each adhesive block.

[0018] The beneficial effects of this invention are: 1. The large-aperture low-temperature waisted lens support fixture provided by the present invention has flexible support units symmetrically arranged on the inner wall of the lens support frame. The flexible support unit consists of an adhesive block and two spring-type flexible sheets. The adhesive block is bonded to the waisted lens to be supported, and the spring-type flexible sheets provide flexible support and bear the deformation and thermal stress of the waisted lens. This solves the problem of severe deformation of low-temperature waisted lenses under huge temperature differences, thereby improving the imaging quality of the infrared system and reducing the thermal deformation of low-temperature waisted lenses under huge temperature differences.

[0019] 2. The large-aperture low-temperature waist-shaped lens support tool provided by the application sets a flexible connection unit on the circular arc frame, which is composed of a connecting ring for connecting the lens mounting substrate and an arc-shaped flexible sheet for bearing the deformation and thermal stress of the waist-shaped lens, and solves the problem of severe deformation of the low-temperature waist-shaped lens under a large temperature difference again and reduces the thermal deformation of the low-temperature waist-shaped lens under a large temperature difference again.

[0020] 3. The large-aperture low-temperature waist-shaped lens support tool provided by the application, the adhesive block is bonded to the waist-shaped lens to be supported by low-temperature glue, the low-temperature glue can bear the deformation and thermal stress of the waist-shaped lens again, and the processing difficulty and debugging assembly difficulty of the flexible support unit are also reduced, the number of the flexible support unit can be increased or reduced according to the size of the waist-shaped lens to be supported, the problem of stress concentration of bonding is reduced, the problem of severe deformation of the low-temperature waist-shaped lens under a large temperature difference is further solved, and the thermal deformation of the low-temperature waist-shaped lens under a large temperature difference is further reduced.

[0021] 4. The large-aperture low-temperature waist-shaped lens support tool provided by the application realizes three times of release of the thermal stress of the waist-shaped lens to be supported through the flexible support unit, the flexible connection unit and the low-temperature glue bonding, so that the thermal stress of the large-aperture waist-shaped low-temperature infrared lens assembly is released multiple times.

[0022] 5. The large-aperture low-temperature waist-shaped lens support tool provided by the application further sets an adjusting gasket between the lens support frame and the lens mounting substrate, the adjusting gasket can adjust the axial position between the waist-shaped lens to be supported and the lens mounting substrate, so that the mounting position of the waist-shaped lens to be supported is more accurate, and the imaging quality is higher.

[0023] 6. The large-aperture low-temperature waist-shaped lens support tool provided by the application further sets a positioning pin between the lens support frame and the lens mounting substrate, which can accurately position the mounting positions of the two, further accurately position the mounting position of the waist-shaped lens to be supported and improve the imaging quality.

[0024] 7. The large-aperture low-temperature waist-shaped lens support tool provided by the application, the lens support frame, the flexible support unit and the flexible connection unit are integrally made of titanium alloy or invar material, have good rigidity, toughness and temperature adaptability, and can well realize the processing of the flexible structure. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic diagram of the large-aperture low-temperature waist-shaped lens support tool embodiment of the application; Figure 2 is an exploded view of Figure 1 ; Figure 3 is a structural schematic diagram of the lens support frame in the embodiment of the application; Figure 4This is a structural schematic diagram of the flexible support unit and the partial straight frame in an embodiment of the present invention; Figure 5 This is a schematic diagram of the flexible connecting unit and the partial arc-shaped frame in an embodiment of the present invention; Figure 6 This is a schematic diagram of the angle in an embodiment of the present invention.

[0026] The attached figures are labeled as follows: 1-Waist-shaped lens to be supported, 2-Lens support frame, 21-Straight frame, 22-Arc frame, 221-Circular through hole, 222-Arc through hole, 223-Wire threading hole, 224-Weight reduction hole, 23-Second injection hole, 24-U-groove, 3-Flexible support unit, 31-Adhesive block, 32-Spring-type flexible sheet, 33-First injection hole, 4-Flexible connection unit, 41-Connecting ring, 42-Arc flexible sheet, 5-Lens mounting substrate, 51-Light transmission hole, 52-Threaded hole, 53-Screw, 6-Positioning pin, 7-Adjusting shim. Detailed Implementation

[0027] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] This invention provides a large-aperture, low-temperature, waist-shaped lens support fixture, combined with... Figure 1 and Figure 2 As shown, it includes a lens support frame 2 for setting around the waist lens 1 to be supported, 2N+2M ​​flexible support units 3 set on the inner wall of the lens support frame 2, and a lens mounting substrate 5 set on the bottom surface of the lens support frame 2; N≥1, M≥1; In this embodiment, the number of flexible support units 3 is determined according to the size of the waist lens 1 to be supported. In this embodiment, N=2 and M=1 are selected according to the size of the waist lens 1 to be supported, so the lens support frame 2 is provided with six flexible support units 3; The lens mounting substrate 5 is provided with a light-transmitting hole 51 in the middle that matches the shape of the waist lens 1 to be supported.

[0029] The waist-shaped lens 1 to be supported is usually made of infrared glass such as single-crystal germanium or zinc selenide, and its arc diameter is between Φ50mm and Φ500mm.

[0030] like Figure 3As shown, the lens support frame 2 is an oblong frame, including two straight frame edges 21 of equal length and parallel to each other, and circular arc frame edges 22 symmetrically arranged at both ends of the two straight frame edges 21 and correspondingly connected to the two straight frame edges 21; the width B of the lens support frame 2 is determined by the width of the oblong lens 1 to be supported. Among them, four flexible support units 3 are symmetrically and evenly distributed on the inner walls of the two straight frame edges 21, that is, two flexible support units 3 are provided on each straight frame edge 21, and two flexible support units 3 are symmetrically and evenly distributed on the inner walls of the two circular arc frame edges 22, that is, one flexible support unit 3 is provided on each circular arc frame edge 22; weight reduction holes 224 are also provided on the side walls of each circular arc frame edge 22.

[0031] Each straight frame 21 has two U-shaped grooves 24 on its inner wall, and each arc frame 22 has one U-shaped groove 24 on its inner wall, so there are a total of six U-shaped grooves 24 on the lens support frame 2. The six U-shaped grooves 24 and six flexible support units 3 are set one-to-one. The U-shaped opening of the U-shaped groove 24 faces the waist-shaped lens 1 to be supported, and the connection between its two parallel sidewalls and the bottom of the groove is an arc transition connection. The flexible support unit 3 is set in the corresponding U-shaped groove 24.

[0032] Combination Figure 3 and Figure 4As shown, the flexible support unit 3 includes an adhesive block 31 and spring-type flexible sheets 32 disposed on both sides of the adhesive block 31. The two spring-type flexible sheets 32 located on both sides of the same adhesive block 31 have equal lengths. In this embodiment, the lengths of the spring-type flexible sheets 32 disposed at the arc-shaped frame 22 and the spring-type flexible sheets 32 disposed at the straight frame 21 are different. One end of the spring-type flexible sheet 32 ​​is fixedly connected to the adhesive block 31, and the connection is an arc-shaped transition connection. The other end is perpendicularly connected to the two parallel sidewalls of the corresponding U-shaped groove 24, and the connection is also an arc-shaped transition connection. The arc size at the connection point can adjust the flexibility and stress concentration of deformation; the sidewalls of the spring-type flexible sheet 32 ​​and the corresponding adhesive block 31 near the bottom of the U-shaped groove 24 are on the same plane, and there is a gap between this plane and the bottom of the U-shaped groove 24; the adhesive block 31 has a first glue injection hole 33 in the middle, with a diameter of Φ1.6mm; the lens support frame 2 has the same number of second glue injection holes 23 as the first glue injection holes 33, with a diameter of Φ3mm, and each second glue injection hole 23 is located in the middle of the bottom of the corresponding U-shaped groove 24. The adhesive block 31 is bonded to the waisted lens 1 to be supported by low-temperature epoxy glue (DW-3, DW-4, 2216, 8217, etc.) injected from the second glue injection holes 23 and the first glue injection holes 33, and the deformation and thermal stress of the waisted lens 1 to be supported are directly released through the glue layer. The adhesive surface of the adhesive block 31 installed at the straight frame 21 is flat and is used to bond with the straight edge of the waist lens 1 to be supported; the adhesive surface of the adhesive block 31 installed at the arc frame 22 is arc-shaped and its curvature is consistent with and matches the curvature of the arc edge of the waist lens 1 to be supported, and is used to bond with the arc edge of the waist lens 1 to be supported; the flexible support unit 3 can release the deformation and thermal stress of the waist lens 1 to be supported again.

[0033] Combination Figure 3 and Figure 5As shown, each arc-shaped frame 22 is provided with two flexible connecting units 4, which are located near the two ends of the arc-shaped frame 22. The flexible connecting unit 4 includes a connecting ring 41 and two arc-shaped flexible pieces 42 located at both ends of the diameter of the connecting ring 41. The arc-shaped frame 22 is provided with a circular through hole 221 and two arc-shaped through holes 222 that match the shape of the two arc-shaped flexible pieces 42. The two arc-shaped through holes 222 are located at both ends of the diameter of the circular through hole 221 and are connected to the circular through hole 221. At the end of the arc-shaped through hole 222 away from the circular through hole 221, there is a wire threading hole 223 that is connected to the arc-shaped through hole 222 for the wire to be threaded in the slow wire feeding process. The two wire threading holes 223 located on both sides of the same circular through hole 221 are symmetrically arranged on both sides of the circular through hole 221. A connecting ring 41 is disposed within a circular through hole 221, and two arc-shaped flexible sheets 42 are disposed within two arc-shaped through holes 222 respectively. One end of the arc-shaped flexible sheet 42 is connected to the connecting ring 41, and the other end is connected to the inner wall of the arc-shaped through hole 222 away from the circular through hole 221. The inner diameter of the circular through hole 221 is larger than the outer diameter of the connecting ring 41, resulting in a gap between the inner wall of the circular through hole 221 and the outer wall of the connecting ring 41. The arc-shaped radial width (i.e., the arc-shaped radial length, commonly referred to as the width due to its narrowness) of the arc-shaped through hole 222 is larger than the arc-shaped radial width of the arc-shaped flexible sheet 42, resulting in a gap between the two arc-shaped radial side walls of the arc-shaped flexible sheet 42 and the two arc-shaped radial inner walls of the arc-shaped through hole 222. The center of the arc-shaped flexible sheet 42 and the arc-shaped through hole 222 are aligned with the center point of the waist-shaped lens 1 to be supported.

[0034] The lens mounting base 5 has threaded holes 52 that correspond one-to-one with the inner holes of each connecting ring 41; the lens support frame 2 and the lens mounting base 5 are detachably connected by screws 53 provided in the inner holes of the connecting rings 41 and the threaded holes 52. Each arc-shaped frame 22 is provided with an adjusting shim 7 between itself and the lens mounting base 5 for spacing adjustment; the lens mounting base 5 has a flat mounting boss for placing the adjusting shim 7, that is, the mounting boss is provided between the adjusting shim 7 and the lens mounting base 5; the screws 53 pass through the corresponding mounting boss and adjusting shim 7.

[0035] The flexible connection unit 4 can release the deformation and thermal stress of the waist-shaped lens 1 to be supported in three stages.

[0036] Each arc-shaped frame 22 is positioned relative to the lens mounting base 5 by a positioning pin 6; the positioning pin 6 passes through the corresponding positioning holes on the arc-shaped frame 22 and the lens mounting base 5.

[0037] In this embodiment, the lens support frame 2, the flexible support unit 3, and the flexible connection unit 4 are made of titanium alloy or Invar steel in one piece and are processed by wire cutting technology to ensure the dimensional accuracy of the flexible unit and reduce errors.

[0038] In this embodiment, for waist-shaped lenses with different aspect ratios, the flexibility of the support structure is coarsely adjusted by changing the number of flexible support units on the straight and curved sides. For waist-shaped lenses with aspect ratios between 0.1 and 0.3, six flexible support units are symmetrically distributed along the straight sides for support and bonding. For those with aspect ratios between 0.3 and 0.7, four flexible support units are symmetrically distributed along the straight sides, and two flexible support units are symmetrically distributed along the curved sides for support and bonding. For those with aspect ratios between 0.7 and 0.9, two flexible support units are symmetrically distributed along the long side along the straight sides, and four flexible support units are symmetrically distributed along the curved sides for support and bonding. Next, the flexibility of the support structure is finely adjusted by changing the thickness and length of the bonding sheet of each flexible support unit and the rounded corners at the ends, thus achieving the deformation requirements of different waist-shaped lenses.

[0039] like Figure 6 As shown, the following are defined: the line connecting the midpoint of the connecting ring 41 and the midpoint of the waisted lens 1 to be supported is the first line; the line connecting the midpoint of the wire-threading hole 223 near the outer end face of the arc frame and the midpoint of the waisted lens 1 to be supported is the second line; the line connecting the midpoint of the positioning hole and the midpoint of the waisted lens 1 to be supported is the third line; and the centerline between the two straight edges of the waisted lens 1 to be supported (parallel to the straight edges) is its central axis.

[0040] In this embodiment, the angle θ1 between the first connecting line and the central axis of the waist-shaped lens 1 to be supported ranges from (1 / 3 to 2 / 3)arcsin(B / 2R); the angle θ2 between the second connecting line and the central axis of the waist-shaped lens 1 to be supported ranges from (1 / 4 to 3 / 4)θ1; the angle θ3 between the third connecting line and the central axis of the waist-shaped lens 1 to be supported ranges from (0 to θ2 / 2); and R is the radius of the arc of the waist-shaped lens 1 to be supported.

[0041] Assembly process: Each optical and structural component is processed according to requirements, cleaned and dried separately. The lens support frame is placed flat on the mounting table and fixed. The waisted lens to be supported is gently placed into the lens support frame. After adjusting the gap, low-temperature adhesive is evenly injected into each bonding surface through the first and second injection holes to form adhesive spots that adhere to the bonding surfaces. After cleaning off excess adhesive, the lens is placed in a cleaning cabinet to stand. After the low-temperature adhesive has cured and the waisted lens surface shape is found to be qualified, the lens support frame is connected to the lens mounting base. The axial position of the waisted lens and the lens mounting base is adjusted, and then pins are installed to complete the assembly.

[0042] This embodiment also provides a waisted lens unit, including the aforementioned large-aperture low-temperature waisted lens support fixture and waisted lens; the waisted lens is disposed within the lens support frame 2 and is bonded to each adhesive block 31. The width of the waisted lens is determined by the effective light-transmitting aperture; The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A support fixture for a large-aperture, low-temperature waisted lens, characterized in that: It includes a lens support frame (2) for setting around the waist-shaped lens (1) to be supported and 2N+2M ​​flexible support units (3) set on the inner wall of the lens support frame (2); N≥1 and is a positive integer, M≥1 and is a positive integer; The lens support frame (2) is an waist-shaped frame, including two straight frame sides (21) of equal length and parallel to each other and an arc frame side (22) symmetrically arranged at both ends of the two straight frame sides (21) and correspondingly connected to the two straight frame sides (21). Among them, 2N flexible support units (3) are symmetrically and evenly distributed on the inner walls of the two straight frame (21), and 2M flexible support units (3) are symmetrically and evenly distributed on the inner walls of the two arc frame (22). The flexible support unit (3) includes an adhesive block (31) and spring-type flexible sheets (32) disposed on both sides of the adhesive block (31); one end of the spring-type flexible sheet (32) is fixedly connected to the adhesive block (31), and the other end is correspondingly fixedly connected to the inner wall of the straight frame (21) or the arc frame (22); a gap is provided between the adhesive block (31) and the spring-type flexible sheet (32) and the corresponding inner wall of the straight frame (21) or the arc frame (22); The adhesive surface of the adhesive block (31) installed on the straight frame (21) is a plane, which is used to bond with the straight edge of the waist lens (1) to be supported; the adhesive surface of the adhesive block (31) installed on the arc frame (22) is an arc surface, and its curvature is consistent with and matches the curvature of the arc edge of the waist lens (1) to be supported, which is used to bond with the arc edge of the waist lens (1) to be supported. The adhesive block (31) has a first glue injection hole (33) in the middle. The lens support frame (2) is provided with a second glue injection hole (23) that is the same number as the first glue injection hole (33) and corresponds to it one by one.

2. The large-aperture low-temperature waisted lens support fixture according to claim 1, characterized in that: The inner wall of the straight frame (21) is provided with N U-shaped grooves (24), and the inner wall of the arc frame (22) is provided with M U-shaped grooves (24). Then, there are a total of 2N+2M ​​U-shaped grooves (24) on the lens support frame (2). The 2N+2M ​​U-shaped grooves (24) and the 2N+2M ​​flexible support units (3) are set one-to-one. The U-shaped opening of the U-shaped groove (24) faces the waist-shaped lens (1) to be supported, and the connection between its two parallel sidewalls and the bottom of the groove is a rounded transition connection. The flexible support unit (3) is set in the corresponding U-shaped groove (24), and the ends of its two spring flexible sheets (32) away from the adhesive block (31) are respectively vertically connected to the two parallel sidewalls of the corresponding U-shaped groove (24). There is a gap between the spring flexible sheet (32) and the adhesive block (31) and the bottom of the U-shaped groove (24). Each of the second injection holes (23) is located in the middle of the bottom of the corresponding U-shaped groove (24); The adhesive block (31) is bonded to the waist-shaped lens (1) to be supported by low-temperature adhesive injected from the second injection hole (23) and the first injection hole (33).

3. The large-aperture low-temperature waisted lens support fixture according to claim 2, characterized in that: The connection between the spring-type flexible sheet (32) and the parallel sidewall of the U-shaped groove (24) is a circular arc transition connection; The sidewalls of the spring-type flexible sheet (32) and the corresponding adhesive block (31) near the bottom of the U-shaped groove (24) are on the same plane; the connection between the sidewall of the spring-type flexible sheet (32) away from the bottom of the U-shaped groove (24) and the corresponding adhesive block (31) is an arc transition connection.

4. The large-aperture low-temperature waisted lens support fixture according to claim 2 or 3, characterized in that: Each of the arc-shaped frame (22) is provided with two flexible connecting units (4), and the two flexible connecting units (4) are located near the two ends of the arc-shaped frame (22); The flexible connection unit (4) includes a connecting ring (41) and two arc-shaped flexible sheets (42) disposed at both ends of the diameter of the connecting ring (41). The arc frame (22) is provided with a circular through hole (221) and two arc through holes (222) that match the shape of the two arc flexible sheets (42). The two arc through holes (222) are located at both ends of the diameter of the circular through hole (221) and are connected to the circular through hole (221). The connecting ring (41) is disposed in the circular through hole (221), and two arc-shaped flexible pieces (42) are disposed in the two arc-shaped through holes (222) respectively. One end of the arc-shaped flexible piece (42) is connected to the connecting ring (41), and the other end is connected to the inner wall of the arc-shaped through hole (222) away from the circular through hole (221). The inner diameter of the circular through hole (221) is larger than the outer diameter of the connecting ring (41), so that there is a gap between the inner wall of the circular through hole (221) and the outer wall of the connecting ring (41); The arc-shaped radial width of the arc-shaped through hole (222) is greater than the arc-shaped radial width of the arc-shaped flexible sheet (42), so that there is a gap between the arc-shaped radial side walls of the arc-shaped flexible sheet (42) and the arc-shaped radial inner walls of the arc-shaped through hole (222); The center of the arc-shaped flexible sheet (42) and the arc-shaped through hole (222) are aligned with the center point of the waist-shaped lens (1) to be supported.

5. The large-aperture low-temperature waisted lens support fixture according to claim 4, characterized in that: The arc-shaped through hole (222) is provided with a wire-threading hole (223) at one end away from the circular through hole (221), which communicates with the arc-shaped through hole (222). Two wire-threading holes (223) located on both sides of the same circular through hole (221) are symmetrically arranged on both sides of the circular through hole (221).

6. The large-aperture low-temperature waisted lens support fixture according to claim 5, characterized in that: It also includes a lens mounting substrate (5) disposed on the bottom surface of the lens support frame (2) via a flexible connection unit (4); The lens mounting base plate (5) has a light-transmitting hole (51) in the middle that matches the shape of the waist-shaped lens (1) to be supported.

7. The large-aperture low-temperature waisted lens support fixture according to claim 6, characterized in that: The lens mounting base plate (5) is provided with threaded holes (52) that correspond one-to-one with the inner holes of each connecting ring (41). The lens support frame (2) and the lens mounting base plate (5) are detachably connected by screws (53) provided in the inner hole of the connecting ring (41) and the threaded hole (52).

8. The large-aperture low-temperature waisted lens support fixture according to claim 7, characterized in that: An adjusting shim (7) is provided between each of the arc-shaped frame (22) and the lens mounting base (5); the lens mounting base (5) is provided with a flat mounting boss for placing the adjusting shim (7); the screw (53) passes through the corresponding mounting boss and adjusting shim (7); Each of the arc-shaped frame (22) is positioned relative to the lens mounting base (5) by a positioning pin (6); the positioning pin (6) passes through the corresponding positioning holes on the arc-shaped frame (22) and the lens mounting base (5).

9. The large-aperture low-temperature waisted lens support fixture according to claim 8, characterized in that: The lens support frame (2), flexible support unit (3), and flexible connection unit (4) are made of titanium alloy or Invar steel in one piece. The side wall of the arc frame (22) is provided with weight reduction holes (224).

10. A large-aperture, low-temperature waisted lens unit, characterized in that: Includes the large-aperture low-temperature waisted lens support fixture and waisted lens as described in any one of claims 1-9; The waist-shaped lens is set inside the lens support frame (2) and is bonded to each adhesive block (31).

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