Zinc selenide special-shaped sheet processing method

Abstract

The invention discloses a processing method of a zinc selenide special-shaped sheet. The processing method comprises the following steps: S1, processing a zinc selenide material into a prismatic table-shaped preform of which the bottom surface area is greater than the top surface area; s2, performing surface treatment on the side surface of the prismatic table-shaped prefabricated body to form an optical path transfer structure for shortening the length of the lens; and S3, performing curved surface processing on the bottom surface of the prefabricated body to form an optical curved surface for imaging. In the application, through processing on the basis of the prismatic table-shaped prefabricated body, integration of an imaging structure and an optical path transfer structure is facilitated, the processing technology is simplified, and the processing difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the field of zinc selenide material processing, and particularly to a processing method for zinc selenide special-shaped wafers. Background Art

[0002] Zinc selenide is an important II-VI group semiconductor material with a direct-transition band structure, showing excellent performance in the optoelectronic field. Especially in the infrared band of 8 - 14 μm, its intrinsic transmittance is as high as 70%. Therefore, zinc selenide has become an important infrared optical material. In addition, zinc selenide also has excellent physical and chemical properties, such as high light transmittance and low scattering loss. These characteristics make it have broad application prospects in fields such as blue light semiconductor light-emitting devices, nonlinear optoelectronic devices, nuclear radiation detection devices, and near-ultraviolet to visible light detection devices.

[0003] In the related art, it is difficult to integrate an optical path transfer structure on a crescent-shaped zinc selenide special-shaped wafer, and it will affect the imaging quality of the zinc selenide special-shaped wafer. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the present invention is to propose a processing method for zinc selenide special-shaped wafers. By processing the special-shaped surface of zinc selenide in stages, an optical element that takes into account functions such as imaging and optical path transfer can be formed, improving the performance and applicability of the zinc selenide optical special-shaped wafer.

[0005] The present invention provides a processing method for zinc selenide special-shaped wafers, including the steps of:

[0006] S1: Processing a zinc selenide material into a frustum-shaped preform with a bottom surface area larger than the top surface area;

[0007] S2: Performing surface treatment on the side surface of the frustum-shaped preform to form an optical path transfer structure for shortening the lens length;

[0008] S3: Performing curved surface processing on the bottom surface of the preform to form an optical curved surface for imaging.

[0009] In some embodiments, the step S1 includes:

[0010] S11: Dividing and marking the cutting areas on the zinc selenide material blank;

[0011] S12: According to the divided cutting areas, performing cutting by single-wire cutting at a preset cutting speed to divide the zinc selenide blank into multiple strip-shaped blocks;

[0012] S13: Performing bevel cutting on the side surfaces of the strip-shaped blocks to form a frustum-shaped preform with a bottom surface area larger than the top surface area;

[0013] S14: Chamfer the frustum-shaped preform.

[0014] In some embodiments, step S2 includes:

[0015] S21: Grind the four side surfaces of the frustum-shaped preform with a flat-end face milling wheel. The flat-end face milling wheel rotates at a preset speed and moves at a preset feed rate, and the preset feed rate is configured to feed a preset distance after the flat-end face milling wheel rotates a preset angle along the preset speed to achieve the coordination of the preset speed and the preset feed rate.

[0016] In some embodiments, step 2 further includes:

[0017] S22: Blow off the cutting fluid on the surface of the frustum-shaped preform with an air gun;

[0018] S23: Assemble the frustum-shaped preform into a positioning tooling. A slot matching the frustum-shaped preform is provided in the positioning tooling, and the surface of the slot of the positioning tooling is configured to fit the four side surfaces of the frustum-shaped preform.

[0019] In some embodiments, after being processed by step S2, two opposite side surfaces of the frustum-shaped preform are respectively arranged along directions of a first preset angle and a second preset angle with respect to the top surface, forming a first asymmetric side surface and a second asymmetric side surface; the other two opposite side surfaces of the frustum-shaped preform are symmetrically arranged along a direction of a third preset angle with respect to the top surface, forming a third symmetric side surface and a fourth symmetric side surface.

[0020] In some embodiments, step S3 includes:

[0021] S31: The rotary machining tool moves along a first arc trajectory to machine the bottom surface of the frustum-shaped preform into a first spherical surface; S32: The rotary machining tool moves along a second arc trajectory to machine the bottom surface of the frustum-shaped preform into a second spherical surface; the first spherical surface and the second spherical surface are spliced to form a smooth optical surface.

[0022] In some embodiments, the top surface is translated a first preset distance in a direction away from the bottom surface to form a reference surface; the first arc trajectory corresponds to the first spherical surface, the center of the first spherical surface is the intersection point of the reference surface and the central normal of the top surface, and the radius of the first spherical surface is a preset radius.

[0023] In some embodiments, the first asymmetric side face and the second asymmetric side face respectively intersect with the top face to form a first intersection line and a second intersection line, and the line connecting the midpoints of the two intersection lines is defined as the median line; the central normal line is translated a second preset distance from the midpoint of the first intersection line to the midpoint of the second intersection line along the median line direction to form a reference line; the second arc trajectory corresponds to the second spherical surface, the center of the second spherical surface is the intersection point of the reference plane and the reference line, and the radius of the second spherical surface is a preset radius.

[0024] In some embodiments, the machining angle of the rotary machining tool forms a preset angle with the central normal line of the frustum-shaped preform.

[0025] In some embodiments, after being processed in step S2, a surplus base is integrally provided on the top face of the frustum-shaped preform; the top face edge of the surplus base protrudes from the bottom face edge of the frustum-shaped preform and has a preset thickness.

[0026] It can be seen from the combined technical solutions that the embodiments provided by the present invention have the following advantages:

[0027] (1) Machining based on the frustum-shaped preform is conducive to the integrated integration of the imaging structure and the optical path transfer structure, simplifies the processing technology and reduces the processing difficulty.

[0028] (2) Through the inclined side faces of the frustum with a bottom area larger than the top area, a folded path for optical path transfer is formed, enabling the light to turn inside the zinc selenide special-shaped sheet and compressing the axial length of the optical path; by performing surface treatment on the side faces of the frustum-shaped preform, it is conducive to reducing the loss during the optical path transfer process, and thus conducive to improving the transfer efficiency of the optical path transfer structure;

[0029] (3) By performing curved surface machining on the bottom face of the preform to form an optical curved surface, the imaging function of the integrated zinc selenide optical special-shaped sheet and the transfer path of the zinc selenide special-shaped sheet are integrated, coordinating the optical path transfer function and the imaging function, improving the performance and applicability of the zinc selenide optical special-shaped sheet, and thus being conducive to the miniaturization of devices such as infrared lenses. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figures 1-4 It is a flowchart of a method for processing a zinc selenide special-shaped sheet according to an embodiment of the present invention;

[0032] Figure 5is a frustum-shaped preform according to an embodiment of the present invention;

[0033] Figure 6 is a schematic structural view of the frustum-shaped preform according to an embodiment of the present invention from another perspective, and also a schematic structural view of the zinc selenide special-shaped sheet from another perspective;

[0034] Figure 7 is a schematic structural view of the zinc selenide special-shaped sheet according to an embodiment of the present invention;

[0035] Figure 8 is a schematic structural view of the plate-shaped zinc selenide blank according to an embodiment of the present invention;

[0036] Figure 9 is a schematic structural view of the long strip-shaped block according to an embodiment of the present invention;

[0037] Figure 10 is a connection schematic diagram of the frustum-shaped preform and the surplus base according to an embodiment of the present invention;

[0038] Figure 11 is a schematic structural view of the frustum-shaped preform after chamfering according to an embodiment of the present invention;

[0039] Figure 12 is a schematic structural view of the positioning tooling according to an embodiment of the present invention;

[0040] Figure 13 is a schematic structural view of the frustum-shaped preform after machining the first spherical surface according to an embodiment of the present invention;

[0041] Figure 14 is a schematic structural view of the frustum-shaped preform after machining the second spherical surface according to an embodiment of the present invention.

[0042] Reference numerals:

[0043] zinc selenide special-shaped sheet 100, blank 200;

[0044] long strip-shaped block 1;

[0045] chamfer 2;

[0046] frustum-shaped preform 3, first asymmetric side 31, second asymmetric side 32, third symmetric side 33, fourth symmetric side 34, bottom surface 35, top surface 36, center line normal 360, first intersection line 361, second intersection line 362, center line 363;

[0047] surplus base 4,

[0048] positioning tooling 5, slot 51,

[0049] first spherical center 61, second spherical center 62;

[0050] Reference plane S and reference line L. Detailed implementation manners

[0051] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship 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 thus should not be construed as a limitation of the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0054] In the related art, the crescent-shaped zinc selenide special-shaped sheet can only play an imaging role. The light beam is input from the concave surface of the crescent-shaped special-shaped sheet and output from the convex surface of the crescent. If an optical path transfer structure is directly integrated on the basis of the crescent-shaped zinc selenide special-shaped sheet, the imaging quality of the zinc selenide special-shaped sheet will be affected.

[0055] The embodiment of the present invention provides a method for processing a zinc selenide special-shaped sheet.

[0056] Embodiment 1

[0057] As Figure 1 shown, this embodiment provides a method for processing a zinc selenide special-shaped sheet. The method for processing a zinc selenide special-shaped sheet includes the following steps:

[0058] Please refer toFigure 1 and Figure 5 In step S1: Process the zinc selenide material into a frustum-shaped preform 3 with a bottom surface area larger than the top surface area.

[0059] Please refer to Figure 1 、 Figure 5 and Figure 6 In step S2: Perform surface treatment on the side surface of the frustum-shaped preform 3 to form an optical path transfer structure for shortening the lens length.

[0060] Please refer to Figure 1 、 Figure 5 and Figure 7 In step S3: Perform curved surface processing on the bottom surface 35 of the preform to form an optical curved surface for imaging.

[0061] The optical path transfer structure here means that the optical path is input from one side surface of the zinc selenide special-shaped sheet 100, and after refraction / reflection inside the frustum, it is emitted, forming a folded optical path structure, which is beneficial to shortening the axial length of the light.

[0062] In this application, by preparing the frustum-shaped preform 3 and successively processing the side surface and the bottom surface 35 of the frustum-shaped preform 3, an optical path transfer structure and an optical imaging curved surface are formed on the final product (zinc selenide special-shaped sheet 100), thereby integrating the optical path transfer function and the optical imaging function.

[0063] Compared with the related technology, in this application, processing is performed on the frustum-shaped preform 3, which can form an integrated optical path transfer structure and an optical curved surface, reduce the processing difficulty, and improve the integration and quality of the zinc selenide special-shaped sheet 100 product.

[0064] Embodiment 2

[0065] As Figure 2 、 Figures 8-10 shown, this embodiment is basically the same as Embodiment 1, the difference is that: this embodiment provides a processing method for processing the zinc selenide material into a frustum-shaped preform 3, and this processing method includes the following sub-steps:

[0066] Please refer to Figure 2 and Figure 8 In step S11: Divide and mark the cutting area of the zinc selenide material blank 200. The material dividing step S11 is specifically to use a marking tool to divide the cutting area on the zinc selenide blank 200 and mark each divided area. This step is beneficial for forming raw material traceability and better mastering the distribution of the internal quality of the material.

[0067] Please refer to Figure 2 and Figure 9, in step S12: According to the divided cutting regions, perform cutting by single-wire cutting at a preset cutting speed to divide the zinc selenide blank 200 into multiple long strip-shaped blocks 1. In the blanking step S12, considering the high brittleness and easy chipping of the zinc selenide material, after the chemical vapor synthesis of zinc selenide is completed, perform single-wire cutting blanking according to the cutting regions divided in S11.

[0068] Please refer to Figure 2 and Figure 10 , in step S13: Perform bevel cutting on the side surfaces of the long strip-shaped blocks 1 to form a frustum-shaped preform 3 with the bottom surface 35 having an area larger than that of the top surface 36.

[0069] Please refer to Figure 2 and Figure 11 , in step S14: Set a chamfer 2 on the frustum-shaped preform 3 to eliminate stress concentration at the edges through the small chamfer 2 and avoid the risk of fracture caused by stress during subsequent processing or use.

[0070] In summary, by stepwise cutting the zinc selenide material blank 200 to form the frustum-shaped preform 3, the structural integrity can be improved and the microcracks of the frustum-shaped preform 3 can be reduced.

[0071] In a specific example:

[0072] Please refer to Figure 8 , in step S11, divide the cutting regions of the zinc selenide material blank 200. The zinc selenide blank 200 is a plate-shaped zinc selenide blank 200 with dimensions of 300 mm * 300 mm * 50 mm.

[0073] Please refer to Figure 9 , in step S12, use single-wire cutting on the zinc selenide material blank 200 to cut the plate-shaped zinc selenide blank 200 into long strip-shaped blocks 1 with dimensions of 115 mm * 70.25 mm * 46.17 mm. The reference value of the preset cutting speed here is approximately 10 mm / min. Optimize the single-wire cutting parameters, adopt a low cutting speed of 10 mm / min, reduce the cutting stress, and reduce the generation of microcracks on the frustum side surfaces.

[0074] Please refer to Figure 10 , in step S13, taking the surface of 70.25 mm * 46.17 mm in the long strip-shaped block 1 as the reference plane, cut the two opposite side surfaces of the long strip-shaped block 1 along a direction inclined 84° - 85° to this reference plane to remove the excess corners; then, cut one of the other two opposite side surfaces of the long strip-shaped block 1 along a direction inclined 82° - 83° to this reference plane, and at the same time, cut the other of the other two opposite side surfaces of the long strip-shaped block 1 along a direction inclined 84° - 85° to this reference plane to remove the remaining materials.

[0075] Please refer to Figure 11 In step S14: Chamfer 2 is set for the frustum-shaped preform 3, the angle of chamfer 2 is 45°, and the amount of chamfer 2 is less than 0.5 mm. In this step, the edge stress concentration is eliminated by the small chamfer 2 to avoid the risk of fracture caused by stress during subsequent processing or use.

[0076] In step S13, the following sub-steps are further included:

[0077] Please refer to Figure 10 Step S131: Rough cut the long bar stock 1 to cut the long bar stock 1 into a frustum-shaped block stock;

[0078] Exemplarily, one face of the frustum-shaped block stock is 70.25 mm * 46.17 mm, this face is defined as the bottom surface 35, the opposite face of the frustum-shaped block stock relative to the position of the bottom surface 35 is defined as the top surface 36, and the size of the top surface 36 is approximately 42 mm * 22 mm;

[0079] Step S132: Bond the bottom surface 35 of the frustum-shaped block stock to the processing table, and perform fine cutting on the four side surfaces of the frustum-shaped block stock to cut the frustum-shaped block stock into the frustum-shaped preform 3;

[0080] Exemplarily, that is, after step S131, mill 1 mm thickness from the four side surfaces to obtain the frustum-shaped preform 3, the bottom surface size of the frustum-shaped preform 3 is 70.25 mm * 46.17 mm, and the top surface size of the frustum-shaped preform 3 is (20 ± 0.1) mm * (40 ± 0.1) mm;

[0081] In step S14, chamfer 2 is set for the frustum-shaped preform 3, the angle of chamfer 2 is 45°, and the amount of chamfer 2 is less than 0.5 mm. In some examples, step S14 can be set between step S131 and step S132.

[0082] Embodiment III

[0083] As Figure 3 shown, this embodiment is basically the same as Embodiment I, the difference is: This embodiment provides a processing method for surface treatment of the side surface of the preform:

[0084] Step S2 includes:

[0085] S21: Grind the four side surfaces of the frustum-shaped preform 3 with a flat milling wheel. The flat milling wheel rotates at a preset rotational speed and moves at a preset feed rate. The preset feed rate is configured to feed a preset distance after the flat milling wheel rotates a preset angle at the preset rotational speed to achieve the coordination of the preset rotational speed and the preset feed rate. In this step, the rotational speed of the grinding wheel and the feed amount are coordinately controlled: maintain a low feed amount under high-speed grinding to reduce the surface roughness of the zinc selenide side surface and reduce the scattering loss of the optical path.

[0086] Step S21 in this embodiment can be combined with step S132 in Embodiment 2, that is, while performing precision cutting to control the surface shape of the preform and removing the excess thickness of the frustum-shaped blank 2, the rough parts on the side surface of the preform are ground flat. Specifically, a five-axis CNC can be used to perform precision cutting and grinding on the frustum-shaped blank 2.

[0087] In some examples, the top surface of the frustum-shaped preform can also be surface-treated with a flat milling wheel.

[0088] S22: Blow off the cutting fluid on the surface of the frustum-shaped preform 3 with an air gun. In this step, the finished frustum-shaped preform 3 after processing is cleaned, which is beneficial for subsequent positioning and surface machining.

[0089] Please refer to Figure 3 and Figure 12 , in step S23: Assemble the frustum-shaped preform 3 into the positioning tooling 5. A slot 51 matching the frustum-shaped preform is provided in the positioning tooling 5, and the surface of the slot of the positioning tooling 5 is configured to fit against the four side surfaces of the frustum-shaped preform 3. In this step, through the fitting of the side surface of the preform and the slot 51 of the positioning tooling 5, the preform 3 can achieve self-positioning and self-centering in the positioning tooling 3, which can reduce the positioning reference problem of the preform 3 during surface machining and improve the convenience of positioning.

[0090] Specifically, the slot 51 is configured as a tapered groove matching the frustum-shaped preform 3.

[0091] Specifically, the flat milling wheel rotates at a speed of 4000 revolutions per minute and moves 0.06 mm per revolution along the feed direction.

[0092] Embodiment 3

[0093] Please refer to Figure 5 and Figure 6, Further, after the treatment in step S2, two opposite side faces of the frustum-shaped preform 3 are respectively arranged along directions forming a first preset angle and a second preset angle with the top face 36, forming a first asymmetric side face 31 and a second asymmetric side face 32; two opposite side faces of the frustum-shaped preform 3 are symmetrically arranged along a direction forming a third preset angle with the top face 36, forming a third symmetric side face 33 and a fourth symmetric side face 34.

[0094] It should be further noted that one of the first asymmetric side face 31 and the second asymmetric side face 32 is an optical path incident face, and the other of the first asymmetric side face 31 and the second asymmetric side face 32 is an optical path exit face; the optical path enters from the first asymmetric side face 31 or the second asymmetric side face 32 in the (final product) zinc selenide shaped sheet 100, and after refraction / reflection inside the frustum, it exits, forming an optical path transfer structure for the folded optical path, which is beneficial to shortening the axial length of the light.

[0095] Please refer to Figure 5 , Further, a surplus base 4 is integrally provided on the bottom face 35 of the frustum-shaped preform 3. The top face edge of the surplus base 4 protrudes from the bottom face edge of the frustum-shaped preform 3, and the surplus base 4 has a preset thickness. By providing the surplus base 4, it is beneficial to ensure the thickness of the (final product) zinc selenide shaped sheet 100 during the curved surface processing and reduce the thickness wear during the curved surface processing.

[0096] Further, the first preset angle is the same as the third preset angle.

[0097] In some specific examples, after step S2, the bottom face 35 of the frustum-shaped preform 3 is a rectangle of 70.25 mm * 46.17 mm, the top face 36 is a rectangle of 40 mm * 20 mm, and the thickness is 110 mm. The first preset angle and the third preset angle are the same and are 84.5°, and the second preset angle is 82.37°. The surplus base 4 is integrally formed on the bottom face 35 of the frustum-shaped preform 3, and the surplus base 4 has a preset thickness, and the preset thickness is 3 mm to 5 mm.

[0098] In some preferred embodiments, the surplus base 4 is configured as a cuboid; that is, when cutting the long strip-shaped block 1, there is no need to deliberately process the surplus base 4, so the surplus base 4 retains the shape of a cuboid. Specifically, in step S23, not only the edges of the frustum-shaped preform 3 are chamfered 2, but also the surplus base 4 with a cuboid structure is chamfered to reduce chipping.

[0099] Please refer to Figure 5 、 Figure 10 and Figure 12, in combination with the above embodiments, the positioning tooling 5 is placed on the heating table and heated to a temperature of 100 - 120 °. After the positioning tooling 5 is heated, paraffin is applied to the slot 51 of the positioning tooling 5 and waits for the paraffin to flow into the slot 51; then, the frustum-shaped preform 3 is inverted and placed into the slot 51, with the surplus base 4 exposed, and left aside to stand and cool.

[0100] Embodiment 4

[0101] As Figure 4 shown, on the basis of Embodiment 3, this embodiment further processes the frustum-shaped preform 3.

[0102] Further, step S3 includes:

[0103] Please refer to Figure 13 , S31: The machining tool rotates and moves along the first arc trajectory to machine the bottom surface 35 of the frustum-shaped preform 3 into a first spherical surface;

[0104] Please refer to Figure 14 , S32: The machining tool rotates and moves along the second arc trajectory to machine the bottom surface 35 of the frustum-shaped preform 3 into a second spherical surface;

[0105] The first spherical surface and the second spherical surface are spliced to form a smooth optical surface.

[0106] Combined with the above embodiments, the positioning tooling 5 can position the bottom surface 35 of the frustum-shaped preform 3, and further position the center of the bottom surface 35 of the frustum-shaped preform 3. The machining tool rotates and moves from the center of the bottom surface of the frustum-shaped preform 3 to the edge of the bottom surface of the frustum-shaped preform 3 along the first arc trajectory and the second arc trajectory to machine the bottom surface 35 of the frustum-shaped preform 3 into a first spherical surface and a second spherical surface. At the same time, the positioning tooling 5 can also protect the machined side surfaces of the frustum-shaped preform 3.

[0107] It should be further noted that the surplus base 4 is eliminated during the surface machining process.

[0108] Combined with Figure 6 and Figure 13 , further, the top surface 36 is translated a first preset distance in the direction away from the bottom surface 35 to form a reference surface S. The first arc trajectory corresponds to the first spherical surface, and the first center of the sphere 61 of the first spherical surface is the intersection point of the reference surface S1 and the central normal 360 of the top surface 36, and the radius of the first spherical surface is a preset radius.

[0109] Combined with Figure 6 and Figure 14, Further, the first asymmetric side surface 31 and the second asymmetric side surface 32 respectively intersect with the top surface 36 to form a first intersection line 361 and a second intersection line 362. The connection line of the midpoints of the two intersection lines is defined as the median line 363. The central normal line 360 is translated along the median line direction from the midpoint of the first intersection line to the midpoint of the second intersection line by a second preset distance to form a reference line L. The second arc trajectory corresponds to a second spherical surface. The second spherical center 62 of the second spherical surface is the intersection point of the reference plane S and the reference line. The radius of the second spherical surface is a preset radius.

[0110] In the above steps, the machining angle of the rotary machining tool forms a preset angle with the central normal line of the top surface 36 of the frustum-shaped preform 3, and the preset angle is 5.81°. The rotary machining tool here is specifically a flat-bottom milling surface grinding wheel, and the flat-bottom milling surface grinding wheel is made of resin.

[0111] In some specific examples, after step S2, the bottom surface 35 of the frustum-shaped preform 3 is a rectangle of 70.25 mm * 46.17 mm, the top surface 36 is a rectangle of 40 mm * 20 mm, and the thickness is 110 mm. The first preset angle and the third preset angle are the same and are 84.5°, and the second preset angle is 82.37°. The surplus base 4 is integrally formed on the bottom surface 35 of the frustum-shaped preform 3, and the surplus base 4 has a preset thickness, and the preset thickness is 3 mm to 5 mm.

[0112] Further, the first preset distance is N, 22.49 mm ≤ N ≤ 22.59 mm; the second preset distance is M, 5.64 mm ≤ M ≤ 5.74 mm; the preset radius is R, 132.6 mm ≤ R ≤ 133.926 mm. Thus, in this example, the splicing radius of the first spherical surface and the second spherical surface is R, and the center offset of the two spherical surfaces is M ≈ 5.7 mm, forming a continuous and smooth composite surface to ensure no distortion in imaging.

[0113] After the machining of the bottom surface 35 of the frustum-shaped preform 3 is completed, the final product, the zinc selenide shaped sheet 100, is formed, and the zinc selenide shaped sheet 100 is cleaned; then, the zinc selenide shaped sheet 100 and the positioning tooling 5 are placed on the heating table again to remove the glue and then taken off; then, the zinc selenide shaped sheet 100 is detected by a three-coordinate instrument to check whether the height, side angle, curvature of the bottom surface 35, and surface roughness of the final product meet the requirements.

[0114] The other components and operations of the zinc selenide shaped sheet processing method according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here. In the description of the present invention, "the first feature" and "the second feature" may include one or more of such features. Among them, the up-down direction, left-right direction, and front-back direction are based on the up-down direction, left-right direction, and front-back direction shown in the figure.

[0115] In the description of the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include indirect contact between the first and second features through additional features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature.

[0116] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0117] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A processing method for a zinc selenide shaped sheet, characterized in that Including the steps: S1: Processing a zinc selenide material into a frustum-shaped preform (3) with a bottom surface area larger than the top surface area; S2: Performing surface treatment on the side surfaces of the frustum-shaped preform (3) to form an optical path transfer structure for shortening the lens length; S3: Performing curved surface machining on the bottom surface of the preform to form an optical surface for imaging.

2. The processing method of the zinc selenide special-shaped sheet according to claim 1, wherein The step S1 includes: S11: Dividing and marking the cutting areas on the zinc selenide material blank (200); S12: According to the divided cutting areas, performing cutting by single-wire cutting at a preset cutting speed to divide the zinc selenide blank (200) into multiple strip-shaped blocks (1); S13: Performing bevel cutting on the side surfaces of the strip-shaped blocks (1) to form a frustum-shaped preform (3) with a bottom surface area larger than the top surface area; S14: Setting chamfers on the frustum-shaped preform (3).

3. The processing method of the zinc selenide shaped sheet according to claim 1, wherein, The step S2 includes: S21: Grinding the four side surfaces of the frustum-shaped preform (3) by a flat-bottom milling surface grinding wheel, the flat-bottom milling surface grinding wheel rotating at a preset speed and moving at a preset feed speed, and the preset feed speed being configured to feed a preset distance after the flat-bottom milling surface grinding wheel rotates a preset angle along the preset speed to achieve the coordination of the preset speed and the preset feed speed.

4. The processing method of the zinc selenide shaped sheet according to claim 3, characterized in that, The step 2 further includes: S22: Blowing off the cutting fluid on the surface of the frustum-shaped preform by an air gun; S23: Assembling the frustum-shaped preform (3) into a positioning tooling (5), a slot (51) matching the frustum-shaped preform (3) being provided in the positioning tooling (5), and the surface of the slot (51) of the positioning tooling (5) being configured to fit against the four side surfaces of the frustum-shaped preform (3).

5. The processing method of the zinc selenide shaped sheet according to claim 1, characterized in that, After being processed by step S2, two opposite side surfaces (31, 32) of the frustum-shaped preform (3) are respectively arranged along directions of a first preset angle and a second preset angle with respect to the top surface (36), forming a first asymmetric side surface (31) and a second asymmetric side surface (32); The other two opposite side surfaces (33, 34) of the frustum-shaped preform (3) are symmetrically arranged along a third preset angle direction with respect to the top surface (36), forming a third symmetric side surface (33) and a fourth symmetric side surface (34).

6. The processing method of the zinc selenide shaped sheet according to claim 5, characterized in that, The step S3 includes: S31: The rotary machining tool moves along a first arc trajectory to machine the bottom surface (35) of the frustum-shaped preform (3) into a first spherical surface; S32: The rotary machining tool moves along a second arc trajectory to machine the bottom surface (35) of the frustum-shaped preform (3) into a second spherical surface; The first spherical surface and the second spherical surface are spliced to form a smooth optical surface.

7. The processing method of the zinc selenide shaped sheet according to claim 6, characterized in that, The top surface (36) is translated a first preset distance in a direction away from the bottom surface (35) to form a reference surface (S); The first arc trajectory corresponds to the first spherical surface, the center of the first spherical surface being the intersection point of the reference surface (S) and the central normal line (360) of the top surface (36), and the radius of the first spherical surface being a preset radius.

8. The processing method of the zinc selenide shaped sheet according to claim 7, characterized in that, The first asymmetric side surface (31) and the second asymmetric side surface (32) respectively intersect with the top surface (36) to form a first intersection line (361) and a second intersection line (362), and the connection line of the midpoints of the two intersection lines is defined as the median line (363); The central normal line (360) is translated a second preset distance from the midpoint of the first intersection line to the midpoint of the second intersection line along the direction of the median line to form a reference line (L); The second arc trajectory corresponds to the second spherical surface, the center of the second spherical surface is the intersection point of the reference surface (S) and the reference line (L), and the radius of the second spherical surface is a preset radius.

9. The processing method of the zinc selenide shaped sheet according to any one of claims 6-8, characterized in that, The machining angle of the rotary machining tool forms a preset angle with the central normal line (360) of the frustum-shaped preform (3).

10. The processing method of the zinc selenide shaped sheet according to any one of claims 6-8, characterized in that, After being processed in step S2, a surplus base (4) is integrally provided on the top surface (36) of the frustum-shaped preform (3); The top surface edge of the surplus base (4) protrudes from the bottom surface edge of the frustum-shaped preform (3) and has a preset thickness.

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