Double-sided reflector and optimization method thereof

Abstract

The invention relates to the field of optical elements, and discloses a double-sided reflector and an optimization method thereof.The double-sided reflector comprises an upper reflector body and a lower reflector body, the two reflector bodies are symmetrical in structure, the front faces of the reflector bodies are provided with reflecting faces, the back faces of the reflector bodies are provided with lightweight holes, and plate ribs are arranged in the lightweight holes; according to the double-sided reflecting mirror, the double-sided reflecting mirror is divided into the upper mirror body and the lower mirror body, the light-weight holes are formed in the back face of any mirror body, then the backs of the two mirror bodies are spliced and attached into a whole, and the light weight of the back of the single-sided mirror body in the double-sided reflecting mirror is achieved.

Description

Technical Field

[0001] The invention relates to the field of optical elements, and in particular to a double-sided reflecting mirror and an optimization method thereof. Background Art

[0002] Double-sided mirrors will gradually be used in the field of aerospace technology due to their unique imaging advantages, especially large-size optical systems. However, the current field of aerospace technology has extremely high requirements on the weight of optical systems, because weight represents the launch cost. Therefore, if double-sided mirrors are to be used in the field of aerospace technology, they must be structurally lightweight.

[0003] Both the front and back sides of a double-sided reflector are reflective surfaces, and both reflective surfaces need to participate in the imaging of the optical system. This special application scenario makes it difficult to design a lightweight back of a double-sided reflector like a single-sided reflector.

[0004] In order to achieve a more efficient design and manufacturing process while ensuring optical performance and structural stability, and to meet the comprehensive needs of modern technology for lightweight and economy, it is necessary to propose a new design concept, improve design efficiency, and develop a new type of lightweight double-sided reflector. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0006] In the first aspect, the present invention provides a double-sided reflecting mirror, comprising a mirror body on an upper and lower surface, wherein the structures of the mirror bodies on the two sides are symmetrical, a reflecting surface is provided on the front side of the mirror body, a lightweight hole is provided on the back side of the mirror body, plate ribs are provided in the lightweight hole, and the backs of the two sides of the mirror body are spliced ​​and bonded together.

[0007] The beneficial effect of a double-sided reflector according to the first aspect of the present invention is as follows: the double-sided reflector is split into upper and lower mirror bodies, lightweight holes are set on the back of any mirror body, and then the backs of the two mirror bodies are spliced ​​and bonded together to achieve lightweighting of the back of the single-sided mirror body in the double-sided reflector.

[0008] Furthermore, the mirror body may be a plane mirror body or a curved mirror body.

[0009] Furthermore, the plate ribs include main board ribs, and the main board ribs include transverse main board ribs and longitudinal main board ribs. The transverse main board ribs are arranged along the width direction of the mirror body, and the longitudinal main board ribs are arranged along the length direction of the mirror body. The positions of the transverse main board ribs and the longitudinal main board ribs are staggered. The setting of the main board ribs can ensure the strength and rigidity of the mirror body. The setting of the main board ribs using this scheme can be based on the edge of the mirror body, which is convenient for positioning during processing.

[0010] Furthermore, the plate ribs also include auxiliary plate ribs, and the auxiliary plate ribs are arranged in the lightweight holes. This solution can further enhance the strength and rigidity of the mirror body.

[0011] Furthermore, a reinforcement support point is provided at the intersection of the main plate ribs and the auxiliary plate ribs. This solution can further enhance the strength and rigidity of the mirror body.

[0012] Furthermore, positioning convex edges are provided on both side edges of the mirror body, and positioning grooves are provided on the positioning convex edges. The positioning grooves are used to position the backs of the two mirror bodies for splicing. With this solution, the positioning can be completed by aligning the positioning grooves on the front and back mirror bodies when the backs of the two mirror bodies are spliced ​​and bonded.

[0013] In a second aspect, the present invention provides a method for optimizing a double-sided reflector, which is used to optimize the structure of the double-sided reflector, comprising the steps of: S1: Get the thickness parameters of the double-sided reflector; S2: Determine the depth of the lightweight hole according to the thickness parameter to obtain the hole depth parameter; S3: Determine the setting parameters of the main reinforcement in the lightweight hole based on the mathematical global calculation method; S4: Based on finite element analysis, determine the distribution position of the secondary plate reinforcement to obtain the distribution position parameters; S5: Based on finite element analysis, determine the optimal position of the reinforcement support point to obtain the optimal position parameters; S6: Perform lightweight setting on any mirror body according to the hole depth parameter, setting parameter, distribution position parameter and optimization position parameter to obtain an optimized double-sided reflector.

[0014] The second aspect of the present invention provides a beneficial effect of an optimization method for a double-sided reflector: by symmetrically splitting the double-sided reflector as a whole and then splicing the back together, the back of any mirror body of the double-sided reflector can be lightweight; through a mathematical global calculation method, the width and distribution of the main board ribs are first determined, and there is no need for repeated iterative verification later, thereby improving the optimization efficiency.

[0015] Furthermore, the setting parameters include a transverse main board rib width, a longitudinal main board rib width, a transverse main board rib spacing, and a longitudinal main board rib spacing.

[0016] Furthermore, the width of the transverse main board ribs, the width of the longitudinal main board ribs, the spacing between the transverse main board ribs and the spacing between the longitudinal main board ribs are all determined by the following formula:

[0017] Wherein, L is the length of the reflector; W is the width of the reflector; S1 is the width of the transverse main rib; S2 is the width of the longitudinal main rib; D1 is the spacing between the transverse main ribs; D2 is the spacing between the longitudinal main ribs; n is the number of transverse main ribs; m is the number of longitudinal main ribs.

[0018] After the width of the transverse main board rib and the width of the longitudinal main board rib are determined by calculation, if the two values ​​are not equal, but the difference is ≤2mm, the larger value can be used uniformly.

[0019] Furthermore, the step S4 includes determining the distribution position of the secondary plate ribs according to the change in the surface shape of the mirror in different gravity directions to obtain distribution position parameters. Since the mirror body is centrally symmetrical, there is no need to analyze the gravity directions of 0 to 360°, and only the gravity directions of 0 to 90° need to be analyzed. According to the analysis results, the gravity direction corresponding to the worst surface shape is determined as the distribution position of the secondary plate ribs. The value of the secondary plate rib width is equal to the value of the main plate rib width. If the transverse main plate rib width is not equal to the longitudinal main plate rib width, in order to ensure the structural strength, the secondary plate rib width can be taken as the larger of the transverse main plate rib width and the longitudinal main plate rib width.

[0020] Furthermore, the step S5 includes applying a torque force to the back side of the mirror body, obtaining the surface shape of the mirror body, and obtaining the optimal position parameters of the reinforcement support point according to the surface shape. The direction of the torque is perpendicular to the mirror body, and the magnitude of the torque is G·l, wherein G is the gravity of the mirror body, and l is the distance from the center of gravity of the other part of the mirror body to the fitting surface. According to the analysis results, the position corresponding to the worst surface shape is determined as the optimal position of the reinforcement support point.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a perspective view of a double-sided reflector of the present invention; Figure 2 It is a structural schematic diagram of a single-sided mirror body of the present invention; Figure 3 is a flow chart of the optimization method of the double-sided reflector of the present invention; Figure 4 This is a schematic diagram of the finite element analysis fitting results of the optimization step S4 of the embodiment of the present invention; Figure 5 This is a schematic diagram of the finite element analysis fitting results of the optimization step S5 of the embodiment of the present invention.

[0023] In the attached figure: 1- lightweight hole; 2- plate reinforcement; 21- transverse main plate reinforcement; 22- longitudinal main plate reinforcement; 23- secondary plate reinforcement; 3- mirror body; 4- reinforced support point; 5- positioning convex edge; 6- positioning groove. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] Combine the following Figures 1 to 5 Embodiments of the present invention are described.

[0028] The present embodiment relates to a double-sided reflector and an optimization method thereof. Currently, it is difficult to design a double-sided reflector with a lightweight back like a single-sided reflector. To address this problem, the present embodiment proposes a double-sided reflector and an optimization concept thereof.

[0029] Reference Figure 1 The present invention provides a double-sided reflector, comprising a mirror body 3 on an upper and lower surface, the structures of the mirror bodies 3 on both sides are symmetrical, in this embodiment, the mirror body 3 is a plane mirror body, a reflecting surface (not shown in the figure) is arranged on the front side of the mirror body 3, a lightweight hole 1 is arranged on the back side of the mirror body 3, a plate rib 2 is arranged in the lightweight hole 1, and the backs of the mirror bodies 3 on both sides are spliced ​​and bonded into one body, and in this embodiment, the lightweight structure of the double-sided reflector is achieved by setting the lightweight hole 1; the plate rib 2 is arranged in the lightweight hole 1, while the lightweight structure of the double-sided reflector is achieved, the strength and rigidity of the mirror body 3 are guaranteed; in this embodiment, the mirror body material is silicon carbide, and the secondary sintering process of silicon carbide is adopted to sinter the mirror bodies 3 on the upper and lower surfaces into one body.

[0030] Furthermore, the plate ribs include main board ribs, and the main board ribs include transverse main board ribs 21 and longitudinal main board ribs 22. The transverse main board ribs 21 are arranged along the width direction of the mirror body, and the longitudinal main board ribs 22 are arranged along the length direction of the mirror body. The positions of the transverse main board ribs 21 and the longitudinal main board ribs 22 are staggered and distributed in a tic-tac-toe shape in the lightweight hole 1. In this embodiment, the main board ribs are based on the edge of the mirror body 3 to facilitate processing and positioning.

[0031] Furthermore, the plate ribs also include auxiliary plate ribs 23, and the auxiliary plate ribs are arranged in the lightweight holes. The strength and rigidity of the mirror body 3 are further enhanced by the arrangement of the auxiliary plate ribs 23. In this embodiment, the distribution position of the auxiliary plate ribs 23 is optimized by the optimization method described later. By optimizing the distribution position of the auxiliary plate ribs 23, the mirror body 3 is subjected to uniform force and has symmetrical rigidity.

[0032] Furthermore, a reinforcement support point 4 is provided at the intersection of the main plate rib and the auxiliary plate rib 23. The strength and rigidity of the mirror body 3 are further improved by setting the reinforcement support point 4. In this embodiment, the position of the reinforcement support point 4 is optimized by the optimization method described later. Reasonable optimization of the position of the reinforcement support point 4 can effectively reduce the deformation of the mirror body under the action of its own weight.

[0033] Furthermore, positioning convex edges 5 are provided on both side edges of the mirror body, and positioning grooves 6 are provided on the positioning convex edges 5. The positioning grooves 6 are used to position the backs of the two mirror bodies 3 for splicing. In this embodiment, when the backs of the two mirror bodies 3 are spliced, the positioning convex edges 5 on the two mirror bodies are fitted together, the positioning grooves 6 are aligned to complete the positioning, and fixing nails are used to pass through the positioning grooves 6 for fixing.

[0034] Reference Figures 1 to 5 The present invention provides a method for optimizing a double-sided reflector, comprising the steps of: S1: Get the thickness parameters of the double-sided reflector; S2: Determine the depth of the lightweight hole 1 according to the thickness parameter to obtain a hole depth parameter; S3: Determine the setting parameters of the main reinforcement in the lightweight hole 1 based on the mathematical global calculation method; S4: Based on finite element analysis, determine the distribution position of the auxiliary plate reinforcement 23 to obtain distribution position parameters; S5: Based on finite element analysis, determine the optimal position of the reinforcement support point 4 to obtain the optimal position parameters; S6: Perform lightweight setting on any mirror body 3 according to the hole depth parameters, setting parameters, distribution position parameters and optimized position parameters to obtain an optimized double-sided reflecting mirror.

[0035] In this embodiment, the back of any mirror body 3 of the double-sided reflector can be lightweighted and the structure optimized by symmetrically splitting the double-sided reflector as a whole and then splicing the back together. By using a mathematical global calculation method, the width and distribution of the main board ribs are first determined, and there is no need for repeated iterative verification later, thereby improving the optimization efficiency.

[0036] In this embodiment, the thickness of the double-sided reflector is 20 mm, and the thickness of the reflective surface is 3 mm, so the depth that can be lightweight is 20 / 2-3=7 mm, that is, the hole depth parameter of the lightweight hole 1 is 7 mm.

[0037] Furthermore, the setting parameters include a transverse main board rib width, a longitudinal main board rib width, a transverse main board rib spacing, and a longitudinal main board rib spacing.

[0038] Furthermore, the width of the transverse main board ribs, the width of the longitudinal main board ribs, the spacing between the transverse main board ribs and the spacing between the longitudinal main board ribs are all determined by the following formula:

[0039] Wherein, L is the length of the mirror body; W is the width of the mirror body; S1 is the width of the transverse main rib; S2 is the width of the longitudinal main rib; D1 is the spacing between the transverse main ribs; D2 is the spacing between the longitudinal main ribs; n is the number of transverse main ribs; m is the number of longitudinal main ribs.

[0040] In this embodiment, the mirror body length is 300 mm, the mirror body width is 300 mm, and the numerical values ​​are substituted into the above formula to calculate all solutions that meet the requirements. For all the calculated solutions, As equal as possible , that is, satisfy According to the solution, in this embodiment, it is calculated that the width of the transverse main board rib is 3 mm, the width of the longitudinal main board rib is 3 mm, the number of the transverse main board ribs is 3, and the number of the longitudinal main board ribs is 3, that is, 3 transverse main board ribs and 3 longitudinal main board ribs are set.

[0041] This embodiment uses a mathematical global calculation method to first determine the width and distribution of the main board ribs, and there is no need for repeated iterative verification, thereby improving optimization efficiency.

[0042] Further, the step S4 includes determining the distribution position of the auxiliary plate rib 23 according to the surface shape change of the mirror in different gravity directions to obtain the distribution position parameter, referring to Figure 5 According to the finite element analysis fitting results, the RMS value of the surface shape of this embodiment is the largest when the gravity is 45°, that is, the surface shape is the worst. Therefore, equidistant secondary plate ribs are set at 45° clockwise and counterclockwise rotation based on the main plate ribs. The width of the secondary plate ribs in this embodiment is 3mm.

[0043] Further, the step S5 includes applying a torque force to the back of the mirror body 3, and obtaining the surface condition of the mirror body 3, and obtaining the optimized position parameters of the reinforcement support point 4 according to the surface condition, referring to Figure 5 According to the finite element analysis fitting results, in this embodiment, reinforced support points are set at five locations with poor surface shape (circles in the figure).

[0044] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A double-sided reflector, characterized in that: It comprises a mirror body on an upper and lower surface, the structures of the two mirror bodies are symmetrical, the front side of the mirror body is provided with a reflective surface, the back side of the mirror body is provided with a lightweight hole, the lightweight hole is provided with a plate rib, and the backs of the two mirror bodies are spliced ​​and bonded together as a whole.

2. The double-sided reflector according to claim 1, characterized in that: The plate ribs include main board ribs, and the main board ribs include transverse main board ribs and longitudinal main board ribs. The transverse main board ribs are arranged along the width direction of the mirror body, and the longitudinal main board ribs are arranged along the length direction of the mirror body. The positions of the transverse main board ribs and the longitudinal main board ribs are staggered.

3. The double-sided reflector according to claim 2, characterized in that: The plate reinforcement further includes auxiliary plate reinforcement, and the auxiliary plate reinforcement is arranged in the lightweight hole.

4. The double-sided reflector according to claim 3, characterized in that: A reinforcement support point is provided at the intersection of the main plate ribs and the auxiliary plate ribs.

5. The double-sided reflector according to claim 1, characterized in that: Positioning convex edges are arranged on both side edges of the mirror body, and positioning grooves are arranged on the positioning convex edges. The positioning grooves are used for splicing and positioning the backs of the two mirror bodies.

6. A method for optimizing a double-sided reflector, the method being used to optimize the structure of the double-sided reflector as claimed in claim 4, characterized in that: Includes steps: S1: Get the thickness parameters of the double-sided reflector; S2: Determine the depth of the lightweight hole according to the thickness parameter to obtain the hole depth parameter; S3: Determine the setting parameters of the main reinforcement in the lightweight hole based on the mathematical global calculation method; S4: Based on finite element analysis, determine the distribution position of the secondary plate reinforcement to obtain the distribution position parameters; S5: Based on finite element analysis, determine the optimal position of the reinforcement support point to obtain the optimal position parameters; S6: Perform lightweight setting on any mirror body according to the hole depth parameter, setting parameter, distribution position parameter and optimization position parameter to obtain an optimized double-sided reflector.

7. The optimization method of a double-sided reflector according to claim 6, characterized in that: The setting parameters include the width of the transverse main board ribs, the width of the longitudinal main board ribs, the spacing between the transverse main board ribs and the spacing between the longitudinal main board ribs.

8. The optimization method of a double-sided reflector according to claim 7, characterized in that: The width of the transverse main rib, the width of the longitudinal main rib, the spacing between the transverse main ribs and the spacing between the longitudinal main ribs are all determined by the following formula: Wherein, L is the length of the reflector; W is the width of the reflector; S1 is the width of the transverse main rib; S2 is the width of the longitudinal main rib; D1 is the spacing between the transverse main ribs; D2 is the spacing between the longitudinal main ribs; n is the number of transverse main ribs; m is the number of longitudinal main ribs.

9. The optimization method of a double-sided reflector according to claim 6, characterized in that: The step S4 comprises: The distribution position of the auxiliary plate reinforcement is determined according to the surface shape change of the mirror in different gravity directions to obtain the distribution position parameters.

10. The optimization method of a double-sided reflector according to claim 6, characterized in that: The step S5 comprises: A torque force is applied to the back side of the mirror body, and the surface shape of the mirror body is obtained, and the optimized position parameters of the reinforcement support points are obtained according to the surface shape.

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