Lightweight and small telescope unit system based on peripheral flexible support

Abstract

A light and small telescope unit system based on peripheral flexible support relates to the technical field of optical precision instruments, and solves the problems of insufficient mirror surface form precision stability, large system weight and long assembly period of traditional peripheral support and back support based telescope systems. The light and small telescope unit system is composed of a primary mirror assembly, a secondary mirror assembly and a support cylinder assembly. The primary mirror assembly comprises a primary mirror and a primary mirror seat, and the primary mirror is connected to the inside of the primary mirror seat by glue injection. The secondary mirror assembly comprises a secondary mirror, a secondary mirror chamber and a truss, the secondary mirror is connected to the inside of the secondary mirror chamber by glue injection, and the secondary mirror chamber is connected to the truss. The support cylinder assembly comprises a support cylinder, a first gasket and a second gasket, and the two ends of the support cylinder assembly are connected to the primary mirror seat and the truss respectively. The telescope unit system prepared by the utility model adopts light and small size and peripheral flexible support structure design, utilizes the elastic deformation of the hinge itself to reduce the stress generated by structural deformation, and improves the stability of the system.

Description

Technical Field

[0001] This utility model relates to the field of optical precision instrument technology, specifically to a lightweight telescope unit system based on peripheral flexible support. Background Technology

[0002] In space optical systems, the telescope unit is the core imaging component, and its structural stability directly affects the imaging quality and system performance. To ensure that the telescope system can still operate stably under complex environmental conditions (temperature changes, vibration, and external forces), the design of the support structure for the optical elements inside the telescope unit has become a key technical challenge.

[0003] Common support structures mainly include three types: back support, side support, and peripheral support. First, back support typically ensures system stability by setting a support structure on the back of the optical element. Three-point back support often uses a combination of a conical sleeve, a flexible joint, and a backplate. However, due to the bonding process, back-supported mirrors require steps such as grinding the conical hole on the back of the primary mirror, bonding and positioning the conical sleeve, and grinding the flexible joint end face to ensure coplanarity. This process is cumbersome and has a long assembly time, and is mostly used in large-aperture mirror support applications. Second, side support is often used in rectangular mirror applications. It fixes the structure by setting support points on the side of the optical element. Compared to back support, side support is structurally simpler and lighter. However, this design may lead to uneven deformation of the system under gravity or temperature changes, affecting the accuracy and stability of the optical system.

[0004] Peripheral support is suitable for supporting small mirrors. It typically involves designing a support structure around the optical element. Compared to the previous two support structures, peripheral support is simpler to construct and easier to assemble. However, this type of support lacks a flexible support structure. When the temperature environment changes, even if a support material with a linear expansion coefficient close to that of the mirror in the optical system is used, thermal stress may still exist, which may affect the imaging quality of the system. Utility Model Content

[0005] To address the issues of insufficient mirror surface accuracy and stability, large system mass, and long assembly time in traditional telescope systems based on peripheral and back supports, this invention proposes a lightweight and compact telescope unit system based on flexible peripheral supports. The technical solution of this invention is as follows: A lightweight telescope unit system based on peripheral flexible support, consisting of a primary mirror assembly, a secondary mirror assembly, and a support cylinder assembly; The primary mirror assembly includes a primary mirror and a primary mirror mount. The primary mirror mount includes a primary mirror chamber and a base. The primary mirror chamber is mounted on the base, and the primary mirror is connected to the interior of the primary mirror chamber via adhesive injection. The primary mirror chamber adopts a structure that completely encloses the primary mirror on all four sides to increase structural rigidity. Multiple sets of flexible support structures are symmetrically arranged around the periphery of the primary mirror chamber. Each set of flexible support structures consists of two sets of hinges. Slotting reduces the impact of structural deformation on the surface accuracy of the primary mirror. The base has multiple weight-reducing slots to reduce the overall weight. The primary mirror mount is made of Invar steel, which has the same coefficient of linear expansion as the primary mirror body. The secondary mirror assembly includes a secondary mirror, a secondary mirror chamber, a secondary mirror adjustment pad, and a truss. The secondary mirror is glued to the interior of the secondary mirror chamber, and the secondary mirror chamber is connected to the truss. The truss and the secondary mirror chamber are made of Invar steel, which has the same coefficient of linear expansion as the secondary mirror body. The support cylinder assembly includes a support cylinder, a first gasket, and a second gasket. One end of the support cylinder is connected to one side of the first gasket, and the other side of the first gasket is connected to the base. The other end of the support cylinder is connected to one side of the second gasket, and the other side of the second gasket is connected to the truss. The support cylinder is made of carbon fiber. The first and second gaskets are made of Invar steel, which has the same coefficient of linear expansion as the support cylinder body.

[0006] Furthermore, the bottom surface of the main mirror chamber is provided with multiple positioning protrusions, the height of the positioning protrusions is 0.5 mm, the multiple positioning protrusions are coplanar to form a positioning surface one, the flatness of the positioning surface one is less than 0.003 mm; the bottom surface of the main mirror is in complete contact with the positioning protrusions.

[0007] Furthermore, the outer edge of the base connecting to the main mirror chamber has a ring-shaped stepped structure, which is used to connect the support cylinder assembly to the main mirror base.

[0008] Furthermore, the interior of the main mirror chamber is provided with multiple bonding surfaces corresponding to the positions of the surrounding flexible support structure. Each bonding surface is provided with an injection groove, which is arranged along the radial direction of the main mirror. The main mirror is connected to the interior of the main mirror mount by injection through the injection groove.

[0009] Furthermore, taking the inner side of the main mirror chamber as a reference, the height of the bonding surface protrudes 0.5 mm more than the height of the inner side of the main mirror chamber, and a gap of 0.2 mm is left between the bonding surface and the main mirror for filling with adhesive.

[0010] Furthermore, the secondary mirror chamber has a step inside, and the back of the secondary mirror contacts the step inside the secondary mirror chamber to form axial positioning; the secondary mirror chamber has three glue injection holes evenly distributed along the radial direction; each glue injection hole has a flexible joint at a corresponding position.

[0011] Furthermore, the secondary mirror assembly also includes a secondary mirror adjustment pad, which is installed between the secondary mirror chamber and the truss. The relative position of the secondary mirror with respect to the primary mirror is adjusted by grinding the adjustment pad.

[0012] Furthermore, the support cylinder is equipped with reinforcing ribs, which include multiple staggered ring ribs and longitudinal ribs.

[0013] Furthermore, a stepped stop structure is provided on the side where the first gasket connects to the support cylinder. The first gasket and the second gasket are respectively connected to the stepped stop structures at both ends of the support cylinder. The first gasket and the second gasket are provided with countersunk holes. Nuts are pre-embedded at both ends of the support cylinder at positions corresponding to the countersunk holes as inserts. The first gasket and the second gasket are fixed to both ends of the support cylinder by screws.

[0014] Furthermore, the first gasket has multiple bosses, each with a height of 0.5 mm and a flatness of less than 0.003 mm. These bosses are coplanar and serve as positioning surface two. The second gasket has multiple bosses, each with a height of 0.5 mm and a flatness of less than 0.003 mm. These bosses are coplanar and serve as positioning surface three. The parallelism of positioning surface three relative to positioning surface two is less than 0.005 mm. The annular step structure has mounting holes corresponding to the bosses, and the truss has mounting holes corresponding to the bosses.

[0015] Compared with existing technologies, this invention solves the problems of insufficient mirror surface accuracy and stability, large system mass, and long assembly period in telescope systems based on peripheral support and back support. Specific beneficial effects include: 1. Ensuring Surface Accuracy: This invention employs a peripheral flexible support structure, utilizing the elastic deformation of the hinges themselves to reduce the overall stress of the structure. Simultaneously, the hinge structure design achieves force balance and stress release in three dimensions, allowing the support force to be evenly distributed around the primary mirror, avoiding stress concentration caused by single-point force application, and keeping the point of maximum stress away from the primary mirror bonding area, thereby reducing the impact on the surface accuracy of the primary mirror. This effectively improves the overall integrity and symmetry of the flexible support in terms of mechanical performance, avoiding the influence of external environmental conditions on the surface accuracy of the primary mirror, thus significantly improving the surface shape retention performance and thermal steady-state response capability of the entire system.

[0016] 2. Lightweight and compact design: The primary mirror mount of the telescope unit system provided by this utility model is equipped with a weight-reducing groove while ensuring support strength, thereby reducing the weight of the system; the support cylinder used in this utility model is equipped with staggered ring ribs and longitudinal ribs, which increases the support rigidity of the support cylinder, minimizes the impact of different temperature environments on the imaging quality of the telescope unit system, and improves the shortcomings of traditional peripheral support telescope unit systems with large overall weight.

[0017] 3. Simple structure and easy assembly: The lightweight telescope unit system based on the peripheral flexible support structure proposed in this utility model has a simple structure, adopts the form of integrating the mirror chamber and the flexible joint, and has fewer assembly operation steps. At the same time, the bonding and curing time is short. Compared with the traditional telescope unit system with central support and three-point support at the back, it greatly shortens the assembly time and improves the assembly efficiency, making it suitable for large-scale industrial applications. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a lightweight telescope unit system; Figure 2 A schematic diagram of the main mirror mount; Figure 3 This is a schematic diagram of the weight reduction groove. Figure 4 This is a schematic diagram of a flexible support structure; Figure 5 This is a schematic diagram of the secondary mirror assembly; Figure 6 This is a structural schematic diagram of the support cylinder assembly; Figure 7 This is a schematic cross-sectional view of the support cylinder assembly; The components are as follows: 1. Primary mirror mount; 101. Hinge; 102. Adhesive surface; 103. Positioning boss; 104. Glue injection groove; 105. Base; 106. Annular step structure; 107. Weight reduction groove; 108. Primary mirror chamber; 109. Adhesive point; 2. Secondary gasket; 201. Boss two; 3. Support cylinder; 301. Reinforcing rib; 4. Primary gasket; 401. Boss one; 5. Truss; 6. Secondary mirror adjustment pad; 7. Secondary mirror chamber; 701. Glue injection hole; 702. Flexible joint; 8. Primary mirror; 9. Secondary mirror. Detailed Implementation

[0019] To make the technical solution of this utility model clearer, the technical solution in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. It should be noted that the following embodiments are only used to better understand the technical solution of this utility model and should not be construed as limiting this utility model.

[0020] Example 1. This invention provides a lightweight and compact telescope unit system based on peripheral flexible support, comprising a primary mirror assembly, a secondary mirror assembly, and a support cylinder assembly, as shown in the following structure. Figure 1-7 As shown, the primary mirror assembly includes a primary mirror 8 and a primary mirror mount 1. The primary mirror 8 is connected to the interior of the primary mirror mount 1 by adhesive injection. The primary mirror mount 1 adopts a structure that encloses the primary mirror 8 on all sides to increase the rigidity of the primary mirror mount 1. To ensure that the surface accuracy of the primary mirror 8 of the telescope unit system tends to be stable under different temperature environments, the primary mirror mount 1 is made of Invar steel with the same linear expansion coefficient as the primary mirror 8. The primary mirror mount 1 includes a base 105 and a primary mirror chamber 108, with the primary mirror chamber 108 disposed on the base 105. Inside the primary mirror chamber 108, corresponding to the bonding surface 102, are 16 sets of flexible support structures. Each set of flexible support structures consists of two sets of flexible hinges 101, such as... Figure 1 , Figure 2 and Figure 4 As shown, by slotting between the two sets of hinges 101, the stress generated by structural deformation is reduced, and the point of maximum stress is moved away from the bonding surface 102, thus reducing the impact on the shape of the 8-sided primary mirror; Figure 2 and Figure 3 As shown, the back of the base 105 is provided with multiple weight-reduction grooves 107 to reduce the weight of the telescope unit system and ensure a lightweight and compact design; as Figure 1 and Figure 5 As shown, the secondary mirror assembly includes a secondary mirror 9, a secondary mirror chamber 7, and a truss 5. The secondary mirror 9 is glued to the interior of the secondary mirror chamber 7, and the secondary mirror chamber 7 is connected to the truss 5. The truss 5 and the secondary mirror chamber 7 are made of Invar steel, which has the same coefficient of linear expansion as the secondary mirror 9. This structural design, which uses Invar steel with the same coefficient of linear expansion as the primary mirror 8 or the secondary mirror 9, can further mitigate the influence of different temperature environments on the surface accuracy of the primary mirror 8 and the secondary mirror 9, giving the telescope unit system good thermal stability and avoiding thermal stress in the optical system when the temperature environment changes, thereby further improving the imaging quality of the system.

[0021] like Figure 1-7As shown, the support cylinder assembly includes a support cylinder 3, a first gasket 4, and a second gasket 2. One end of the support cylinder 3 is connected to one side of the first gasket 4, and the other side of the first gasket 4 is connected to the base 105. The other end of the support cylinder 3 is connected to one side of the second gasket 2, and the other side of the second gasket 2 is connected to the truss 5. In order to meet the requirements of the lightweight and miniaturized design of the telescope unit system, the support cylinder 3 is made of carbon fiber. Carbon fiber has the advantages of high strength and low density, and its linear expansion coefficient is close to zero, which can further reduce the support stiffness of the support cylinder 3 and minimize the impact of different temperature environments on the imaging quality of the telescope unit system. The first gasket 4 and the second gasket 2 are made of Invar steel with the same linear expansion coefficient as the support cylinder 3.

[0022] Example 2. This embodiment is a further illustrative example of Embodiment 1, such as... Figure 1-4 and Figure 6 As shown, the bottom surface of the main mirror chamber 108 is provided with multiple positioning protrusions 103. The height of each positioning protrusion 103 is 0.5 mm. These positioning protrusions 103 are coplanar, forming a positioning surface one, the flatness of which is less than 0.003 mm. The bottom surface of the main mirror 8 is in complete contact with the positioning protrusions 103. A ring-shaped stepped structure 106 is provided around the outer edge of the base 105 where it connects to the main mirror chamber 108, used to connect the support cylinder 3 to the main mirror base 1. Figure 1-4 As shown, multiple bonding surfaces 102 are provided inside the main mirror chamber 108 at positions corresponding to the surrounding flexible support structure. Each bonding surface 102 has a glue injection groove 104, which is arranged radially along the main mirror 8. Silicone rubber is used to bond the main mirror 8 to the inside of the main mirror chamber 108. With the inside of the main mirror chamber 108 as a reference, the height of the bonding surface 102 is 0.5 mm higher than the inner side of the chamber 108, and a 0.2 mm gap is left between the bonding surface 102 and the main mirror 8 for glue filling. Figure 2 and Figure 3 As can be seen, the central bonding point 109 of each bonding surface 102 can generate stress in three directions: X-axis, Y-axis, and Z-axis. The force along the X-axis is perpendicular to the bonding surface 102, the force along the Y-axis is parallel to the bonding surface 102, and the force along the Z-axis satisfies the right-hand rule, enabling the hinge 101 structure to achieve force balance and stress release in three dimensions. This three-dimensional coupling structure design not only gives the flexible support structure better overall integrity and symmetry in mechanical performance, but also makes the supporting force evenly distributed around the main mirror 8, keeping the maximum stress point away from the bonding point 109, thereby significantly reducing stress concentration caused by single-point force and improving the surface shape retention performance and thermal steady-state response capability of the entire system.

[0023] Example 3. This embodiment is a further illustrative example of Embodiment 1, such as... Figure 1 and Figure 5 As shown, the secondary mirror chamber 7 has a step inside, and the back of the secondary mirror 9 contacts the step inside the secondary mirror chamber 7 to form an axial positioning; the secondary mirror chamber 7 has three glue injection holes 701 evenly distributed along the radial direction; each glue injection hole 701 has a corresponding flexible joint 702; the secondary mirror assembly also includes a secondary mirror adjustment pad 6, which is installed between the secondary mirror chamber 7 and the truss 5 and is used to grind and adjust the relative position of the secondary mirror 9 with respect to the primary mirror 8.

[0024] Example 4. This embodiment is a further illustrative example of Embodiment 1, such as... Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, the support cylinder 3 is internally equipped with reinforcing ribs 301, which include multiple staggered ring ribs and longitudinal ribs to enhance the support rigidity of the support cylinder 3; a stepped stop structure one is provided on the side where the first gasket 4 connects to the support cylinder 3, a stepped stop structure two is provided on the side where the second gasket 2 connects to the support cylinder 3, a stepped stop structure three is provided at the end where the support cylinder 3 connects to the first gasket 4, and a stepped stop structure four is provided at the end where the support cylinder 3 connects to the second gasket 2. Structure 1 is connected to Stepped Stop Structure 3; Stepped Stop Structure 2 is connected to Stepped Stop Structure 4. The Stepped Stop Structure can prevent the shearing force of the screw from causing instability to the structure; The first washer 4 and the second washer 2 are provided with countersunk holes, and nuts are pre-embedded at both ends of the support cylinder 3 at positions corresponding to the countersunk holes as inserts. The first washer 4 and the second washer 2 are fixed to both ends of the support cylinder 3 by screws; The first washer 4 is provided with multiple bosses 401, and the height of each boss 401 is 0.5. The flatness of each of the multiple bosses 401 is less than 0.003 mm, and the multiple bosses 401 are coplanar, serving as positioning surface two; the second gasket 2 is provided with multiple bosses 201, the height of which is 0.5 mm, the flatness of which is less than 0.003 mm, and the multiple bosses 201 are coplanar, serving as positioning surface three; the parallelism of positioning surface three relative to positioning surface two is less than 0.005 mm; as Figure 2 and Figure 5 As shown, the annular step structure 106 is provided with mounting holes corresponding to the second boss 201, and the truss 5 is provided with mounting holes corresponding to the first boss 401.

[0025] Combining the lightweight and compact telescope unit system provided in embodiments 1-4 above, from the perspective of miniaturization design, this utility model uses a weight-reducing groove 107 in the base 105 to reduce the overall weight. At the same time, the support cylinder 3 is made of carbon fiber and reinforced with ribs 301, which reduces the weight of the support cylinder 3 while increasing its support stiffness. From the perspective of flexible support structure design, this utility model adopts a peripheral flexible support structure design. The elastic deformation of the hinge 101 itself reduces the stress impact on the overall structure, keeping the maximum stress point away from the primary mirror 8, thereby reducing the impact on the surface accuracy of the primary mirror. Meanwhile, the primary mirror mount 1 is made of Invar steel with the same linear expansion coefficient as the primary mirror 8; the truss 5 and the secondary mirror chamber 7 are made of Invar steel with the same linear expansion coefficient as the secondary mirror 9, further ensuring that the lightweight and compact telescope unit system reduces the impact of temperature on the surface accuracy of the primary mirror 8 and the secondary mirror 9 under different temperature environments, effectively increasing the thermal stability of the lightweight and compact telescope unit system.

[0026] Obviously, the above embodiments are merely examples to clearly illustrate the technical solution of this utility model, and are not intended to limit the technical solution. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A lightweight telescope unit system based on peripheral flexible support, characterized in that, It consists of a primary mirror assembly, a secondary mirror assembly, and a support cylinder assembly; The primary mirror assembly includes a primary mirror (8) and a primary mirror mount (1). The primary mirror mount (1) includes a primary mirror chamber (108) and a base (105). The primary mirror chamber (108) is mounted on the base (105). The primary mirror chamber (108) is glued to the primary mirror (8) and encloses the primary mirror (8) on all sides. The periphery of the primary mirror chamber (108) is symmetrically provided with multiple sets of flexible support structures. Each set of flexible support structures consists of two sets of hinges (101). The base (105) is provided with multiple weight-reducing grooves (107). The secondary mirror assembly includes a secondary mirror (9), a secondary mirror chamber (7), and a truss (5). The secondary mirror (9) is glued to the inside of the secondary mirror chamber (7), and the secondary mirror chamber (7) is connected to the truss (5). The support cylinder assembly includes a support cylinder (3), a first gasket (4), and a second gasket (2). One end of the support cylinder (3) is connected to one side of the first gasket (4), and the other side of the first gasket (4) is connected to the base (105). The other end of the support cylinder (3) is connected to one side of the second gasket (2), and the other side of the second gasket (2) is connected to the truss (5).

2. The lightweight telescope unit system based on peripheral flexible support according to claim 1, characterized in that, The bottom surface of the main mirror chamber (108) is provided with multiple positioning protrusions (103). The height of the positioning protrusions (103) is 0.5 mm. The multiple positioning protrusions (103) are coplanar to form a positioning surface one. The flatness of the positioning surface one is less than 0.003 mm. The bottom surface of the main mirror (8) is in complete contact with the positioning protrusions (103).

3. The lightweight telescope unit system based on peripheral flexible support according to claim 1, characterized in that, The outer edge of the base (105) connected to the main mirror chamber (108) is provided with a ring-shaped stepped structure (106).

4. The lightweight telescope unit system based on peripheral flexible support according to claim 1, characterized in that, The main mirror chamber (108) is provided with multiple bonding surfaces (102) corresponding to the positions of the flexible support structure. The bonding surfaces (102) are provided with glue injection grooves (104). The glue injection grooves (104) are arranged along the radial direction of the main mirror (8). The main mirror (8) is glued and connected to the main mirror chamber (108) through the glue injection grooves (104).

5. The lightweight telescope unit system based on peripheral flexible support according to claim 4, characterized in that, Based on the inner side of the main mirror chamber (108), the height of the bonding surface (102) is 0.5 mm higher than the inner side of the main mirror chamber (108), and there is a gap of 0.2 mm between the bonding surface (102) and the main mirror (8).

6. The lightweight telescope unit system based on peripheral flexible support according to claim 1, characterized in that, The secondary mirror chamber (7) has a step inside, and the back of the secondary mirror (9) contacts the step inside the secondary mirror chamber (7); the secondary mirror chamber (7) has three glue injection holes (701) evenly distributed along the radial direction; each glue injection hole (701) has a corresponding flexible joint (702).

7. The lightweight telescope unit system based on peripheral flexible support according to claim 1, characterized in that, The secondary mirror assembly also includes a secondary mirror adjustment pad (6), which is installed between the secondary mirror chamber (7) and the truss (5).

8. The lightweight telescope unit system based on peripheral flexible support according to claim 1, characterized in that, The support cylinder (3) is equipped with reinforcing ribs (301), which include multiple staggered ring ribs and longitudinal ribs.

9. The lightweight telescope unit system based on peripheral flexible support according to claim 1, characterized in that, The first gasket (4) and the second gasket (2) are respectively connected to the stepped stop at both ends of the support cylinder (3); the first gasket (4) and the second gasket (2) are provided with countersunk holes, and nuts are pre-embedded at both ends of the support cylinder (3) at positions corresponding to the countersunk holes, and the first gasket (4) and the second gasket (2) are fixed to both ends of the support cylinder (3) by screws.

10. The lightweight telescope unit system based on peripheral flexible support according to claim 3, characterized in that, The first gasket (4) is provided with a plurality of bosses (401), each boss (401) having a height of 0.5 mm, a flatness of each boss (401) of less than 0.003 mm, and a coplanarity of the bosses (401) as positioning surface two; the second gasket (2) is provided with a plurality of bosses (201), each boss (201) having a height of 0.5 mm, a flatness of each boss (201) of less than 0.003 mm, and a coplanarity of the bosses (201) as positioning surface three; the parallelism of positioning surface three relative to positioning surface two is less than 0.005 mm; the annular step structure (106) is provided with mounting holes corresponding to bosses (201), and the truss (5) is provided with mounting holes corresponding to bosses (401).

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