A rotating mirror for ultra-high-speed photography with a small deformation and high fundamental frequency topological structure

Abstract

The invention discloses a rotating mirror for an ultra-high-speed camera with a small-deformation high-fundamental-frequency topological structure. The rotating mirror is an equitriangular prism structure, comprising three rectangular mirror surfaces of the same size and two equilateral triangular end surfaces of the same size. The long sides of the three rectangular mirror surfaces are arranged in pairs, and the wide sides of the three rectangular mirror surfaces are arranged in pairs to form two equilateral triangular end surfaces. The rotating mirror also comprises three identical topological structures symmetrical about three angle bisectors of the equilateral triangular end surfaces. A single topological structure comprises a first through hole assembly, a second through hole assembly and a third through hole assembly which are symmetrically arranged along the angle bisectors in sequence. The through holes in the first through hole assembly, the second through hole assembly and the third through hole assembly have the same size and shape, and the through holes have the same spacing, so that the stiffness from the edge of the rotating mirror to the center line and the stiffness from the mirror surface to the center line can be balanced, thereby reducing the deformation of the mirror surface and improving the fundamental frequency of the rotating mirror. The processing technology is simpler.

Description

Technical Field

[0001] The present invention relates to the technical field of ultra-high-speed cameras, and more particularly to a rotating mirror for an ultra-high-speed camera with a small-deformation and high-base-frequency topological structure. Background Art

[0002] The rotating mirror is a core component in a rotating-mirror ultrahigh-speed camera. Its structure and mechanical properties directly determine the camera's temporal resolution, spatial resolution, imaging quality, and operational reliability. In a framing-type ultrahigh-speed camera system, the intermediate image is formed near the rotating mirror, which serves as both a field lens and a high-speed scanning reflector. In a scanning-type ultrahigh-speed camera, the rotating mirror serves as both a projection lens and a high-speed scanning reflector. Regarding spatial resolution, larger mirror dimensions increase the amount of information it carries, but also increase internal stress and deformation, increasing the likelihood of damage to the mirror system and, ultimately, the imaging system. Regarding temporal resolution, the temporal resolution of an ultrahigh-speed camera system is directly proportional to the mirror's rotational speed; higher rotational speeds yield higher temporal resolution. However, due to structural limitations, the first-order critical rotational speed of the mirror, which depends on its material and structure, is generally between 200,000 and 400,000 rpm, limiting its temporal resolution. Reducing the mirror's dimensions can also improve both its first-order critical rotational speed and temporal resolution. However, the reduction in the size of the rotating mirror structure will inevitably reduce the size of the ultra-high-speed camera frame and reduce its spatial resolution. The lateral deformation of the rotating mirror will cause image distortion, which directly affects the imaging quality of the ultra-high-speed camera. Summary of the Invention

[0003] In order to solve the shortcomings of the prior art, the present invention provides a rotating mirror with a small deformation and high fundamental frequency topology for ultra-high-speed photography. Without changing the original mirror size of the rotating mirror, the maximum lateral deformation of the mirror is reduced from the original 1.191×10 -6 mm is reduced to 0.654×10 -6 The maximum lateral deformation of the triangular end face is reduced by 45.1% to 54.9% of the original structure, effectively improving the imaging quality of ultrahigh-speed cameras. The fundamental frequency of the rotating mirror is 8876.3 Hz, an increase of 532.1 Hz from the original structure's 8344.2 Hz. The first-order critical limiting speed of the rotating mirror is increased by 31,926 rpm, a 6% increase over the original speed, which can improve the temporal resolution of ultrahigh-speed cameras to a certain extent.

[0004] The technical effect to be achieved by the present invention is realized through the following scheme: a rotating mirror for an ultra-high-speed camera with a small deformation and high fundamental frequency topological structure, the rotating mirror is an equitriangular prism structure, including three rectangular mirror surfaces of the same size and two equilateral triangular end surfaces of the same size, the long sides of the three rectangular mirror surfaces are arranged in pairs, the enclosed long sides form the edges of the rotating mirror, and the wide sides of the three rectangular mirror surfaces are enclosed to form two equilateral triangular end surfaces, the rotating mirror also includes three identical topological structures that are symmetrical about the three angle bisectors of the equilateral triangular end surfaces, and a single topological structure includes a first through hole assembly, a second through hole assembly and a third through hole assembly that are symmetrically arranged along the angle bisectors in sequence, the through holes in the first through hole assembly, the second through hole assembly and the third through hole assembly are the same in size and shape, and the respective through holes have the same spacing.

[0005] Preferably, the first through hole combination is formed at the outermost side of the angle bisector and includes 8 through holes, which are arranged at equal intervals from the vertex in the order of 1 through hole in the first row, 2 through holes in the second row, 3 through holes in the third row and 2 through holes in the fourth row.

[0006] Preferably, the second through hole combination is formed on the side of the first through hole combination away from the vertex of the equilateral triangle end face, and includes 19 through holes, which are arranged at equal intervals from near to far from the first through hole combination in the order of 3 through holes in the first row, 4 through holes in the second row, 5 through holes in the third row, 4 through holes in the fourth row, and 3 through holes in the fifth row.

[0007] Preferably, the third through hole assembly is formed on a side of the second through hole assembly away from the first through hole assembly, and includes three through holes formed on both sides of the angle bisector and arranged linearly, and the line formed by the center points of the three through holes on one side is set at a 30° angle to the angle bisector.

[0008] Preferably, the cross section of the through hole in the topological structure is an equihexagon with a circumscribed circle radius of 0.4 mm, and a transition edge with a fillet radius of 0.02 mm is provided between two adjacent sides of the equihexagon.

[0009] Preferably, the edges with the shortest distance between two adjacent through holes in the topological structure are arranged in parallel, and the spacing between the parallel edges is 0.11 mm.

[0010] Preferably, the center distance between two adjacent through holes is 0.69 mm.

[0011] Preferably, the volume of the rotating mirror is 3424.5mm 3 The radius of the circumscribed circle of the end face of the equilateral triangle is 13.83 mm.

[0012] Preferably, the rotating mirror is provided with a central hole, the central hole passes through two equilateral triangle end faces, and the center point of the central hole coincides with the center point of the equilateral triangle end faces.

[0013] Preferably, the diameter of the central hole is 6 mm.

[0014] The present invention has the following advantages:

[0015] 1. By making the through-holes in the three through-hole assemblies of the topological structure of the same size and shape and having the same spacing between the through-holes, the stiffness from the edge of the rotating mirror to the center line and the stiffness from the mirror surface to the center line can be balanced, thereby reducing the deformation of the mirror surface and improving the fundamental frequency of the rotating mirror. In addition, the same size and shape of the through-holes makes the processing of the rotating mirror simpler.

[0016] 2. By specifically setting the number and combination shape of the through holes in the first through hole assembly, the second through hole assembly, and the third through hole assembly, the sealing of the material of this part of the assembly and the rigidity of this part of the structure of the assembly can be reduced;

[0017] 3. The through hole is an equihexagon with a circumscribed radius of 0.4 mm. There is also a transition edge with a fillet radius of 0.02 mm between the adjacent sides of the equihexagon, which can achieve a relative balance between the stiffness from the mirror surface to the center of the rotating mirror and the stiffness from the edge to the center, thereby reducing the relative lateral deformation of the mirror surface;

[0018] 4. The closest edges between two adjacent through holes are arranged in parallel, and the spacing between the parallel edges is 0.11mm, so as to improve the rigidity of the structure from the edge to the center of the rotating mirror, thereby improving the fundamental frequency of the rotating mirror, achieving the dual purpose of reducing the deformation of the mirror surface and increasing the fundamental frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of a rotating mirror for an ultra-high-speed camera with a small deformation and high fundamental frequency topological structure according to the present invention;

[0020] Figure 2 This is a schematic structural diagram of the mid-side triangle end face of a rotating mirror for an ultra-high-speed camera with a small deformation and high fundamental frequency topology structure according to the present invention;

[0021] Figure 3 This is a schematic diagram of the enlarged structure of the topological structure of a rotating mirror for an ultra-high-speed camera with a small deformation and high fundamental frequency topological structure according to the present invention;

[0022] Figure 4 This is a curve showing the lateral deformation of a rotating mirror for an ultra-high-speed camera with a small-deformation and high-fundamental-frequency topology structure according to the present invention;

[0023] Figure 5This is a curve of the lateral deformation of the rotating mirror used in ultra-high-speed cameras in the prior art. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. Examples of the embodiments 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 intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying 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.

[0026] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first," "second," or "third" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0027] In the present invention, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," "fixed," and "disposed" should be understood in a broad sense. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; or internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0028] Combine Figure 1-Figure 4As shown, an embodiment of the present invention provides a rotating mirror for an ultra-high-speed camera with a small deformation and high fundamental frequency topology. The rotating mirror is an equitriangular prism structure, comprising three rectangular mirror surfaces 100 of equal size and two equilateral triangular end surfaces 200 of equal size. Specifically, the long sides of the three rectangular mirror surfaces 100 are arranged in pairs, forming the edges of the rotating mirror. The wide sides of the three rectangular mirror surfaces 100 are arranged to form two equilateral triangular end surfaces 200. The space enclosed by the rectangular mirror surfaces 100 and the equilateral triangular end surfaces 200 constitutes the main structure of the rotating mirror. The rotating mirror can be made of, but is not limited to, an aluminum alloy. The rotating mirror has a central hole 300, which passes through the two equilateral triangular end surfaces 200, with the center point of the central hole 300 coinciding with the center point of the equilateral triangular end surfaces 200. A rotating shaft (not shown) can be provided within the central hole 300. The rotating mirror is mounted in the darkroom of the ultra-high-speed camera via the rotating shaft and is driven to rotate by the rotating shaft. Specifically, the radius of the circumscribed circle of the equilateral triangle end face 200 is 13.83 mm, and the diameter of the central hole 300 is 6 mm.

[0029] The rotating mirror also includes three identical topological structures 400 symmetrical about the three angle bisectors A of the equilateral triangle end face 200. Each of these topological structures 400 includes a first through-hole assembly 410, a second through-hole assembly 420, and a third through-hole assembly 430, arranged symmetrically along the angle bisectors A. The through-holes in the first through-hole assembly 410, the second through-hole assembly 420, and the third through-hole assembly 430 are identical in size and shape, and the through-holes are spaced the same distance apart. This arrangement of topological structures 400 balances the stiffness from the mirror edge to the centerline and the stiffness from the mirror surface to the centerline, thereby reducing mirror surface deformation and improving the fundamental frequency of the rotating mirror. Furthermore, the uniform size and shape of the through-holes simplify the manufacturing process of the rotating mirror.

[0030] Specifically, the first through-hole assembly 410 is formed on the outermost side of the angle bisector A, close to the vertex of the equilateral triangle end face 200. The first through-hole assembly 410 includes 8 through-holes, which are arranged at equal intervals from the vertex in the following order: 1 through-hole in the first row, 2 through-holes in the second row, 3 through-holes in the third row, and 2 through-holes in the fourth row. The second through-hole assembly 420 is formed on the side of the first through-hole assembly 410 away from the vertex of the equilateral triangle end face 200. The second through-hole assembly 420 includes 19 through-holes, which are arranged at equal intervals from the first through-hole assembly 410 in the following order: 3 through-holes in the first row, 4 through-holes in the second row, 5 through-holes in the third row, 4 through-holes in the fourth row, and 3 through-holes in the fifth row. The third through-hole assembly 430 is formed on a side of the second through-hole assembly 420 away from the first through-hole assembly 410. It includes three through-holes formed on either side of an angle bisector A and arranged linearly. The center points of the three through-holes on a single side form a line at a 30° angle to the angle bisector A. The number and combination of through-holes in the first through-hole assembly 410, the second through-hole assembly 420, and the third through-hole assembly 430 can reduce the sealing of the material in this portion of the assembly and the structural rigidity of this portion of the assembly.

[0031] As a further improvement to the embodiment of the present invention, the cross-section of the through hole in the topological structure 400 is an equihexagon with a circumscribed circle radius of 0.4 mm, and there is a transition edge with a fillet radius of 0.02 mm between the adjacent sides of the equihexagon, which can achieve a relative balance between the stiffness from the mirror surface to the center of the rotating mirror and the stiffness from the edge to the center, thereby reducing the relative lateral deformation of the mirror surface.

[0032] As a further improvement to the embodiment of the present invention, the closest edges between two adjacent through-holes in topological structure 400 are arranged parallel to each other, with a spacing of 0.11 mm between these parallel edges. This increases the rigidity of the structure from the edges to the center of the rotating mirror, thereby improving the fundamental frequency of the rotating mirror, achieving the dual goals of reducing mirror deformation and increasing the fundamental frequency. More preferably, the center-to-center distance between two adjacent through-holes is 0.69 mm.

[0033] In the embodiment of the present invention, the volume of the rotating mirror is 3424.5mm 3 , while the volume of the rotating mirror in the existing technology is 4576.61 mm 3 The structural mass of the rotating mirror is reduced to 75% of the existing one, which effectively improves the fundamental frequency of the rotating mirror.

[0034] In the embodiment of the present invention, the angles between the axes of the through holes in the topological structure 400 are 60° and 120° respectively. The settings of these two angles correspond to the angles of the rotating mirror and the angle between the axes of the rotating mirror.

[0035] Combine Figure 4-Figure 5 As shown, the rotating mirror of the embodiment of the present invention has a maximum lateral deformation of the mirror surface increased from the original 1.191×10 -6 mm is reduced to 0.654×10 -6 The maximum lateral deformation of the triangular end face is reduced by 45.1% to 54.9% of the original structure, effectively improving the imaging quality of ultra-high-speed cameras. The fundamental frequency of the rotating mirror in this embodiment of the present invention is 8876.3 Hz, an increase of 532.1 Hz from the original structure's 8344.2 Hz. The first-order critical limiting speed of the rotating mirror is increased by 31,926 rpm, a 6% increase over the original structure. This can improve the temporal resolution of ultra-high-speed cameras to a certain extent.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention rather than to limit them. Although the embodiments of the present invention are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the present invention can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rotating mirror for an ultra-high-speed camera with a small deformation and high fundamental frequency topological structure, the rotating mirror is an equilateral triangular prism structure, including three rectangular mirror surfaces of the same size and two equilateral triangular end surfaces of the same size, the wide sides of the three rectangular mirror surfaces are arranged in pairs, the enclosed wide sides form the edges of the rotating mirror, and the long sides of the three rectangular mirror surfaces are enclosed to form two equilateral triangular end surfaces, characterized in that: The rotating mirror further comprises three identical topological structures symmetrical about three angle bisectors of the end faces of an equilateral triangle, wherein a single topological structure comprises a first through-hole assembly, a second through-hole assembly and a third through-hole assembly which are sequentially symmetrically arranged along the angle bisectors, wherein the through-holes in the first through-hole assembly, the second through-hole assembly and the third through-hole assembly are of the same size and shape and have the same spacing between the through-holes; The first through hole assembly is formed at the outermost side of the angle bisector and includes 8 through holes, which are arranged at equal intervals from the vertex in the order of 1 through hole in the first row, 2 through holes in the second row, 3 through holes in the third row and 2 through holes in the fourth row.

2. The rotating mirror for ultra-high-speed photography with a small deformation and high fundamental frequency topological structure as claimed in claim 1, characterized in that: The second through hole combination is formed on a side of the first through hole combination away from the vertex of the equilateral triangle end face, and includes 19 through holes, which are arranged at equal intervals from the first through hole combination from near to far in the order of 3 through holes in the first row, 4 through holes in the second row, 5 through holes in the third row, 4 through holes in the fourth row, and 3 through holes in the fifth row.

3. The rotating mirror for ultra-high-speed photography with a small deformation and high fundamental frequency topological structure as claimed in claim 2, characterized in that: The third through hole assembly is formed on one side of the second through hole assembly away from the first through hole assembly, and includes three through holes formed on both sides of the angle bisector and arranged linearly, and the line formed by the center points of the three through holes on one side is set at an angle of 30° to the angle bisector.

4. A rotating mirror for ultra-high-speed photography with a small deformation and high fundamental frequency topological structure as claimed in any one of claims 1 to 3, characterized in that: The cross section of the through hole in the topological structure is an equihexagon with a circumscribed circle radius of 0.4 mm, and there is a transition edge with a fillet radius of 0.02 mm between two adjacent sides of the equihexagon.

5. A rotating mirror for ultra-high-speed camera with small deformation and high fundamental frequency topological structure as claimed in any one of claims 1 to 3, characterized in that: The edges with the shortest distance between two adjacent through holes in the topological structure are arranged in parallel, and the spacing between the parallel edges is 0.11 mm.

6. A rotating mirror for ultra-high-speed photography with a small deformation and high fundamental frequency topological structure as claimed in any one of claims 1 to 3, characterized in that: The center distance between two adjacent through holes is 0.69 mm.

7. The rotating mirror for ultra-high-speed photography with a small deformation and high fundamental frequency topological structure as claimed in claim 1, characterized in that: The volume of the rotating mirror is 3424.5mm 3 The radius of the circumscribed circle of the end face of the equilateral triangle is 13.83 mm.

8. The rotating mirror for ultra-high-speed photography with a small deformation and high fundamental frequency topological structure as claimed in claim 1, characterized in that: The rotating mirror is provided with a central hole, and the central hole is penetrated by two equilateral triangle end faces, and the center point of the central hole coincides with the center point of the equilateral triangle end faces.

9. The rotating mirror for ultra-high-speed photography with a small deformation and high fundamental frequency topological structure as claimed in claim 8, characterized in that: The diameter of the central hole is 6 mm.

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