Low-stress large-aperture reflector supporting structure and method

Abstract

The invention provides a low-stress large-aperture reflector supporting structure and method, and relates to the technical field of optical reflector supporting, the supporting structure comprises a reflector, a reflector substrate, a cylindrical bonding hole, a flexible lining and a flexible supporting structure, the cylindrical bonding hole and the flexible lining corresponding to the cylindrical bonding hole are designed, and the flexible supporting structure is formed. A cylindrical surface-cylindrical surface matched connection mode is adopted for the bonding interface of the reflecting mirror and the flexible lining, a traditional conical surface-conical surface matched connection mode is replaced, the cylindrical bonding holes can effectively avoid the processes of running-in and turning of the conical surface, the machining cost and the development time are greatly saved, and the production efficiency is improved. The technical problems that an existing traditional reflecting mirror back three-point supporting mode is complex in working procedure, high in machining cost and time cost, incapable of eliminating bonding stress and poor in self heat dissipation effect are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical reflector support, and in particular to a low-stress large-aperture reflector support structure and method. Background Art

[0002] As the core part of the optomechanical system, the reflector assembly plays a key role in determining the performance of the optomechanical system. The support structure of the optical reflector will affect the bonding stress, assembly stress and thermal stress caused by changes in the ambient temperature of the reflector assembly, thereby affecting the stability of the reflector surface accuracy.

[0003] The three-point support on the back is a typical support method suitable for large-aperture reflectors. Generally, the tapered hole on the back of the reflector is bonded to the tapered bushing by adhesive, and then the flexible support is connected through the mechanical interface on the tapered bushing. Finally, the flatness of the mounting surface is leveled by grinding pads, and the reflector substrate is connected. However, this traditional three-point support method on the back of the reflector also has the following disadvantages: First, the reflector and the bushing adopt a "conical surface-conical surface" matching method, which has high requirements on the relative position of the cone sleeve and the tapered hole. It is necessary to repeatedly grind and turn the cone surface to adjust the relative position of the bushing and the tapered hole. The process is complicated and the processing cost and time cost are high. Secondly, in the traditional three-point support structure on the back, the flexible link is concentrated on the flexible support, and the bonding stress caused by the curing shrinkage of the adhesive cannot be eliminated. Moreover, under wide temperature conditions, the heat dissipation effect of the flexible support itself may not be sufficient to ensure the stability of the reflector surface accuracy.

[0004] A Chinese patent with publication number CN114578505A discloses a three-point back support structure for a spatial large-aperture reflector, which includes a reflector and three groups of support components, and the support components include a cone sleeve and a flexible joint; wherein the cone sleeve is fixedly connected to the reflector, and three cone holes are evenly arranged in the circumferential direction of the reflector, and the three groups of support components are respectively bonded to the cone holes by epoxy resin glue; the cone hole is connected to the cone sleeve, and the cone sleeve is fixedly connected to the flexible joint by connecting screws and positioning pins; wherein the flexible joint includes a cone sleeve connecting flange, a flexible part of the flexible joint, a rigid part of the flexible joint and an external connecting flange in sequence from top to bottom and from close to the reflector to away from the reflector; the flexible part of the flexible joint is an inverted parallel tripod structure, including three legs; a groove body is provided in the thickness direction of the cone sleeve connecting flange, and one end of the leg is arranged between the two groove bodies The three legs intersect at one point on the rigid part of the flexible joint. The legs and the groove body make the flexible joint have rotational flexibility and translational flexibility, and have a certain rigidity, which solves the contradiction caused by the inconsistent requirements of the static and dynamic performances of the reflector assembly on the rigidity and flexibility of the support structure, and realizes high-performance support for the three points on the back of the large-aperture reflector; This support structure has the following disadvantages: First, the assembly process is cumbersome. Before the reflector cone hole and the cone sleeve are bonded, it is necessary to grind and machine the conical surface according to the design requirements, and repeatedly test the assembly to ensure that the relative position relationship between the two meets the design requirements before bonding, assembly and other work can be carried out; Second, the bonding stress between the cone hole and the cone sleeve cannot be released. After the cone hole and the cone sleeve are bonded, the bonding stress generated by the curing shrinkage of the adhesive cannot be eliminated. The bonding stress directly acts on the reflector body, which will affect the stability of the reflector surface accuracy. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a low-stress large-aperture reflector support structure and method.

[0006] A low-stress large-aperture reflector support structure comprises: a reflector and a reflector substrate, wherein a cylindrical bonding hole is opened on the back of the reflector, a flexible bushing corresponding to the cylindrical bonding hole is installed in the cylindrical bonding hole, a flexible support structure is connected in the flexible bushing, an end of the flexible support structure away from the reflector is connected to the reflector substrate, and a glue layer is coated between the flexible bushing and the cylindrical bonding hole.

[0007] Furthermore, a glue layer curing groove is provided on the outer wall surface of the flexible bushing, and a glue outlet is provided on the glue layer curing groove.

[0008] Furthermore, a glue injection hole is provided on the flexible bushing, and the glue injection hole is communicated with the glue outlet.

[0009] Furthermore, a glue overflow groove is provided on the outer wall surface of the flexible bushing, and the glue overflow groove is connected to the glue layer curing groove.

[0010] Furthermore, a plurality of first flexible grooves are evenly distributed along the circumferential direction at both ends of the flexible bushing, and there are overlapping portions between the heads and tails of the plurality of first flexible grooves.

[0011] Furthermore, a flexible link is provided on the flexible support structure, and a second flexible groove is also provided on the flexible link.

[0012] Furthermore, the reflector support structure also includes a gasket, one end of the gasket is connected to the flexible support structure, and the other end of the gasket is connected to the reflector substrate.

[0013] Furthermore, a first interface is provided on the flexible bushing, and the first interface is located at one end of the flexible bushing close to the reflector.

[0014] Furthermore, a second interface is provided at one end of the flexible link close to the reflector, and a third interface is provided at one end of the flexible support structure away from the reflector.

[0015] The present invention also includes a low-stress large-aperture reflector support method, which is implemented based on a low-stress large-aperture reflector support structure described in any of the above items. First, the flexible bushing is connected to the flexible support structure, then the reflector substrate is connected to the flexible support structure, and then the flexible bushing is installed in the cylindrical bonding hole on the back of the reflector, and finally glue is applied between the flexible bushing and the cylindrical bonding hole.

[0016] The technical solution of the present invention has the following advantages:

[0017] 1. In the technical solution provided by the present invention, by designing a cylindrical bonding hole and a corresponding flexible bushing, the bonding interface between the reflector and the flexible bushing adopts a "cylindrical surface-cylindrical surface" matching connection form, replacing the traditional "conical surface-conical surface" matching connection form. The cylindrical bonding hole can effectively avoid the process of grinding and turning the conical surface, greatly saving processing costs and development time.

[0018] 2. In the technical solution provided by the present invention, in the design of the heat dissipation link, a dual flexible design of a flexible bushing and a flexible support structure is adopted. At the same time, the bonding stress of the reflector is released through the second flexible groove, and the second flexible groove and the flexible link jointly release the assembly stress and thermal stress of the reflector. Under the premise of ensuring the structural rigidity, the stability of the surface accuracy of the reflector is guaranteed.

[0019] 3. In the technical solution provided by the present invention, in terms of the design of the bonding process structure, glue is injected through the glue injection hole and glue is discharged from the glue outlet, which effectively ensures the uniformity of the glue layer. The glue overflow groove is designed to vent and discharge glue to ensure that there are no bubbles in the glue layer, thereby achieving precise control of the bonding area, achieving good bonding effect and a fast and reliable operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a cross-sectional view of the overall structure of the present invention;

[0023] Figure 3 For the present invention Figure 2 A partial enlarged view of the middle A;

[0024] Figure 4 It is an exploded schematic diagram of the overall structure of the present invention;

[0025] Figure 5 It is a schematic diagram of the cylindrical bonding hole structure of the present invention;

[0026] Figure 6 It is a cross-sectional view of the cylindrical bonding hole structure of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the first flexible groove, the glue injection hole and the glue overflow groove of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of the first interface, the adhesive layer curing groove and the adhesive outlet of the present invention;

[0029] Fig. 9 It is a schematic diagram of the second interface, flexible link, second flexible groove and third interface structure of the present invention.

[0030] Description of reference numerals:

[0031] 1-reflector; 2-flexible bushing; 3-flexible support structure; 4-gasket; 5-reflector substrate; 6-screw; 7-cylindrical bonding hole; 8-first flexible groove; 9-positioning surface; 10-first interface; 11-glue layer curing groove; 12-glue injection hole; 13-glue outlet; 14-glue overflow groove; 15-second interface; 16-flexible link; 17-second flexible groove; 18-third interface. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0033] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] like Figure 1 to Figure 6 A low-stress large-aperture reflector support structure shown includes: a reflector 1 and a reflector substrate 5, wherein three cylindrical bonding holes 7 are evenly opened on the back of the reflector 1 at intervals of 120°, and the cylindrical bonding holes 7 serve as interfaces of the support components, and flexible bushings 2 corresponding to the cylindrical bonding holes 7 are installed in the cylindrical bonding holes 7, and a flexible support structure 3 is connected in the flexible bushing 2, and one end of the flexible support structure 3 away from the reflector 1 is connected to the reflector substrate 5, and a glue layer is coated between the flexible bushing 2 and the cylindrical bonding holes 7, and the reflector 1 can be made of transparent optical materials such as microcrystalline glass and fused quartz glass; the reflector substrate 5 needs to ensure high rigidity, and a lightweight structure can be designed according to requirements.

[0037] The above-mentioned low-stress large-aperture reflector support structure adopts a "cylindrical surface-cylindrical surface" matching connection form for the bonding interface between the reflector 1 and the flexible bushing 2 by designing a cylindrical bonding hole 7 and a corresponding flexible bushing 2, replacing the traditional "conical surface-conical surface" matching connection form. The cylindrical bonding hole 7 can effectively avoid the process of grinding and turning the conical surface, greatly saving processing costs and development time. The reflector 1 and the flexible bushing 2 are connected by an adhesive layer. In order to avoid grinding and turning the conical surface when assembling the cone sleeve and the cone hole, the bonding interface between the reflector 1 and the flexible bushing 2 is designed to be in the form of a "cylindrical surface-cylindrical surface". The matching clearance and the thickness of the adhesive layer are guaranteed by mechanical processing, and no matching is required.

[0038] like Figure 7 and Figure 8 As shown, in this embodiment, a glue layer curing groove 11 is provided on the outer wall surface of the flexible bushing 2, and a glue outlet 13 is provided on the glue layer curing groove 11; a glue injection hole 12 is also provided on the flexible bushing 2, and the glue injection hole 12 is connected to the glue outlet 13; a glue overflow groove 14 is also provided on the outer wall surface of the flexible bushing 2, and the glue overflow groove 14 is connected to the glue layer curing groove 11; glue is injected through the glue injection hole 12 and glue is discharged from the glue outlet 13, which effectively ensures the uniformity of the glue layer, and the overflow glue groove 14 is designed to exhaust and discharge glue to ensure that there are no bubbles in the glue layer. When injecting glue, the overflow glue groove 14 plays the role of exhausting and discharging excess adhesive, so as to The uniformity and integrity of the glue layer are ensured, and precise control of the bonding area is achieved. The operation process is fast and reliable. The circumferentially distributed glue layer curing grooves 11 are used to guide and fill the adhesive during the glue injection process. The depth of the glue layer curing grooves 11 can be determined according to the physical properties of the adhesive. Three glue injection holes 12 are designed on the flexible bushing 2, and the glue injection holes 12 are evenly distributed along the circumferential direction; each glue injection hole 12 corresponds to a group of glue outlets 13, and the number and spacing of each group of glue outlets 13 can be set according to parameters such as adhesive properties and bonding surface depth. The position where the adhesive flows out during glue injection is controlled to ensure the uniformity of the glue layer.

[0039] like Figure 5 to Figure 7As shown, in this embodiment, both ends of the flexible bushing 2 are evenly distributed with multiple first flexible grooves 8 along the circumferential direction, and there are overlapping parts between the head and tail of the multiple first flexible grooves 8; the number of the first flexible grooves 8 is specifically three, and there is circumferential overlap between the head and tail joints of each two adjacent first flexible grooves 8, in order to ensure uniform flexibility in the circumferential direction, and the first flexible groove 8 runs through the entire end face of the flexible bushing 2 to ensure that the flexibility of the bonding surface is evenly distributed along the axial direction and the bonding stress is released synchronously; the first flexible groove 8 is processed by wire cutting technology, and the width, depth, geometric shape, position distribution and other parameters of the first flexible groove 8 can be designed accordingly according to the actual requirements of the reflector 1. Considering the bonding process, a positioning surface 9 is provided on the outer cylindrical surface of the flexible bushing 2, and there is a small gap between the positioning surface 9 and the cylindrical bonding hole 7, so that the flexible bushing 2 can be installed in the cylindrical bonding hole 7.

[0040] like Fig. 9 As shown, in this embodiment, a flexible link 16 is provided on the flexible support structure 3, and a plurality of second flexible grooves 17 are also provided on the flexible link 16; two layers of flexible links 16 with the same structure and orthogonal distribution are provided on the flexible support structure 3, and flexibility is introduced under the premise of ensuring the structural rigidity of the component, so as to release the thermal stress caused by the difference in the linear expansion coefficient of the material in the reflector 1, and the second flexible groove 17 releases the thermal stress in the radial and axial directions, and each second flexible groove 17 is processed by wire cutting slow wire walking process, and its form and size can be designed according to the actual parameters of the reflector 1.

[0041] like Figure 4 As shown, in this embodiment, the reflector support structure also includes a gasket 4, one end of the gasket 4 is connected to the flexible support structure 3, and the other end of the gasket 4 is connected to the reflector substrate 5; a third interface 18 is provided on the end of the flexible support structure 3 away from the reflector 1, and the gasket 4 is connected between the flexible support structure 3 and the reflector substrate 5 by a screw 6 penetrating the third interface 18, so as to adjust the mounting surfaces of the three flexible support structures 3 to be coplanar; a first interface 10 is provided on the flexible bushing 2, and the first interface 10 is located at one end of the flexible bushing 2 close to the reflector 1; a second interface 15 is provided on the end of the flexible link 16 close to the reflector 1, and the second interface 15 is connected to the first interface 10 through a connecting piece.

[0042] like Figures 1 to 9 As shown, the present invention also includes a low-stress large-aperture reflector support method, which is implemented based on a low-stress large-aperture reflector support structure described in any one of the above items, firstly connecting the flexible bushing 2 with the flexible support structure 3, then connecting the reflector substrate 5 with the flexible support structure 3, then installing the flexible bushing 2 into the cylindrical bonding hole 7 on the back of the reflector 1, and finally applying glue between the flexible bushing 2 and the cylindrical bonding hole 7;

[0043] Specifically, firstly, the assembly link before bonding is carried out, and a matching bonding tool is needed to control the relative distance between the mounting surface of the flexible support structure 3 and the back plane of the reflector 1 by means of reference transmission, so as to indirectly ensure the axial position of the flexible bushing 2 and the flexible support structure 3 in the cylindrical bonding hole 7, that is, to control the bonding depth of the flexible bushing 2; the specific operation is to first connect the flexible bushing 2 with the flexible support structure 3, connect the bonding tool with the flexible support structure 3, and then install the flexible bushing 2 into the cylindrical bonding hole 7 on the back of the reflector 1 for pre-assembly, and after assembly, ensure that the outer cylindrical surface of the flexible bushing 2 is matched with the cylindrical bonding hole 7 of the reflector 1, and the positioning surface of the bonding tool is in close contact with the back plane of the reflector 1;

[0044] Secondly, glue injection is performed by using a syringe to inject glue through the three glue injection holes 12 at the same time. During glue injection, the adhesive overflow from the glue outlet 13 and the flow and coverage of the adhesive in the glue layer curing groove 11 are observed through the back or side of the reflector 1. When the adhesive uniformly covers the entire glue layer curing groove 11 without bubbles, glue injection is stopped.

[0045] Finally, the excess adhesive is cleaned and the overall structure is kept in position until the adhesive is completely cured, thus completing the bonding of the reflector 1 and the flexible bushing 2 .

[0046] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A low-stress large-aperture reflector support structure, comprising: A reflector (1) and a reflector substrate (5), characterized in that a cylindrical bonding hole (7) is opened on the back of the reflector (1), a flexible bushing (2) corresponding to the cylindrical bonding hole (7) is installed in the cylindrical bonding hole (7), a flexible support structure (3) is connected in the flexible bushing (2), one end of the flexible support structure (3) away from the reflector (1) is connected to the reflector substrate (5), and a glue layer is coated between the flexible bushing (2) and the cylindrical bonding hole (7).

2. A low-stress large-aperture reflector support structure according to claim 1, characterized in that: A glue layer solidification groove (11) is provided on the outer wall surface of the flexible bushing (2), and a glue outlet (13) is provided on the glue layer solidification groove (11).

3. A low-stress large-aperture reflector support structure according to claim 2, characterized in that: The flexible bushing (2) is also provided with a glue injection hole (12), and the glue injection hole (12) is connected to the glue outlet (13).

4. The low-stress large-aperture reflector support structure according to claim 2, characterized in that: The outer wall surface of the flexible bushing (2) is also provided with a glue overflow groove (14), and the glue overflow groove (14) is connected to the glue layer curing groove (11).

5. The low-stress large-aperture reflector support structure according to claim 1, characterized in that: Both ends of the flexible bushing (2) have a plurality of first flexible grooves (8) evenly distributed along the circumferential direction, and there are overlapping portions between the heads and tails of the plurality of first flexible grooves (8).

6. The low-stress large-aperture reflector support structure according to claim 1, characterized in that: The flexible support structure (3) is provided with a flexible link (16), and the flexible link (16) is also provided with a second flexible groove (17).

7. The low-stress large-aperture reflector support structure according to claim 1, characterized in that: The reflector support structure also includes a gasket (4), one end of the gasket (4) is connected to the flexible support structure (3), and the other end of the gasket (4) is connected to the reflector substrate (5).

8. The low-stress large-aperture reflector support structure according to claim 1, characterized in that: The flexible bushing (2) is provided with a first interface (10), and the first interface (10) is located at one end of the flexible bushing (2) close to the reflector (1).

9. The low-stress large-aperture reflector support structure according to claim 6, characterized in that: A second interface (15) is provided on the end of the flexible link (16) close to the reflector (1), and a third interface (18) is provided on the end of the flexible support structure (3) away from the reflector (1).

10. A low-stress large-aperture reflector support method, the method is implemented based on a low-stress large-aperture reflector support structure according to any one of claims 1 to 9, characterized in that: First, the flexible bushing (2) is connected to the flexible support structure (3), then the reflector substrate (5) is connected to the flexible support structure (3), and then the flexible bushing (2) is installed in the cylindrical bonding hole (7) on the back of the reflector (1), and finally glue is applied between the flexible bushing (2) and the cylindrical bonding hole (7).

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