Microprismatic reflective film having combined triangular pyramid structure and manufacturing method for microprismatic reflective film mold

Abstract

The present invention relates to a microprismatic reflective film having a combined triangular pyramid structure and a manufacturing method for a microprismatic reflective film mold. A surface of the microprismatic reflective film is formed by an array of identical unit cells, wherein vertically and horizontally adjacent unit cells are rotationally offset by 180 degrees; the bottom face of each unit cell is an equilateral triangle, and three faces of each unit cell corresponding to the three edges of the bottom face are three faces of a truncated triangular pyramid; three truncated pyramid faces of each unit cell are the same, and the three truncated pyramid faces of each unit cell are respectively a first truncated pyramid face T1 of the unit cell, a second truncated pyramid face T2 of the unit cell and a third truncated pyramid face T3 of the unit cell; and each unit cell is composed of a first triangular pyramid G1, a second triangular pyramid G2 and a third triangular pyramid G3, which are the same and are located at corners, and a fourth triangular pyramid G4 located in the center. According to the microprismatic reflective film having a combined triangular pyramid structure, an additional angular variable of the fourth triangular pyramid located in the center can be adjusted, thereby optimizing the wide-angle performance of the reflective film.

Description

Micro-prism retroreflective film with three-prism combined structure and mold manufacturing method thereof TECHNICAL FIELD

[0001] The present application relates to a micro-prism retroreflective film with three-prism combined structure and a mold manufacturing method thereof. BACKGROUND

[0002] One of the three-prisms widely used in the market is an equilateral triangular base and three reflecting surfaces with an angle of 90 degrees, as shown in FIG. 1. Another three-prism is an isosceles triangular base and three reflecting surfaces with an angle of 90 degrees.

[0003] At present, the optical design variable of the micro-prism retroreflective film is only one, and it is difficult to obtain different incident angles and observation angles (especially wide-angle) to achieve the simultaneous improvement of the retroreflective performance of different azimuth angles and the balance between the retroreflective performance of different incident angles and observation angles (especially wide-angle and small incident angle) and the balance between the retroreflective performance of different azimuth angles (such as 0 degrees, 90 degrees and 180 degrees).

[0004] In the prior art, in order to obtain the uniformity of the retroreflective performance of different azimuth angles of the retroreflective film, the four types of retroreflective film nickel molds are usually mechanically spliced with two different orientations of 0 degrees and 90 degrees to manufacture the roller master mold; by slightly adjusting one angle to deviate from the standard corner reflector structure, the retroreflective performance of the retroreflective film is adjusted (such as improving the wide-angle performance), but the above method is very complicated, the mechanical error is large, and it is difficult to achieve the expected effect.

[0005] In addition, although the micro-prism retroreflective film with full-prism (3M, USA) has a 50% higher retroreflective performance than the micro-prism retroreflective film with three-prism, and the effective reflection area of the three-prism retroreflective film is 66.67% of that of the full-prism retroreflective film, the mold structure of the full-prism retroreflective film (such as Chinese patents No. 2015107772604 and 201811202555.9) is very complex, the manufacturing difficulty is very high, and the retroreflective performance is much lower than expected due to the mold manufacturing error, thus limiting its popularization and application. TECHNICAL PROBLEM

[0006] In view of the above problems, the purpose of the present application is to provide a micro-prism retroreflective film with three-prism combined structure and a mold manufacturing method thereof, which is reasonable in design, convenient to manufacture, can adjust the new angle variable of the fourth three-prism located in the center, so as to optimize the wide-angle performance of the retroreflective film, or obtain the optimal balance of the performance of 0 degrees and 90 degrees of the retroreflective film. TECHNICAL SOLUTION

[0007] The technical solutions of the present application are as follows:

[0008] The surface of the micro-prism reflective film is formed by an array of identical unit bodies, the upper, lower, left and right adjacent unit bodies are rotated and staggered by 180 degrees, the bottom surface of the unit body is an equilateral triangle, the three surfaces of the unit body corresponding to the three edges of the bottom surface are the three surfaces of a three-prism table, the three prism table surfaces of the unit body are the same, the three prism table surfaces of the unit body are the first prism table surface T1 of the unit body, the second prism table surface T2 of the unit body and the third prism table surface T3 of the unit body, respectively, the unit body is composed of three identical first three-prism G1, second three-prism G2 and third three-prism G3 located at the corners and fourth three-prism G4 located at the center, the first three-prism G1, the second three-prism G2 and the third three-prism G3 constitute a first group of three-prisms;

[0009] The two prism surfaces of the first three-prism G1, the second three-prism G2 and the third three-prism G3 are shared by the two prism table surfaces of the unit body, respectively, and the third prism surface of the first three-prism, the second three-prism and the third three-prism is parallel to the third prism table surface T3 of the unit body, the first prism table surface T1 of the unit body and the second prism table surface T2 of the unit body, respectively;

[0010] The included angle between the three prism surfaces of the fourth three-prism G4 and the bottom surface of the unit body is different from the included angle between the prism surfaces of the first three-prism G1, the second three-prism G2 and the third three-prism G3 and the bottom surface, so that the first three-prism G1, the second three-prism G2 and the third three-prism G3 are different from the fourth three-prism G4,

[0011] The first group of three-prisms realizes the main retroreflective performance of the reflective film, and the fourth three-prism G4 adjusts or compensates the wide-angle retroreflective performance or other orientation retroreflective performance of the reflective film. Advantages

[0012] Advantages of the present application:

[0013] 1) The present application can realize the optical structure of a micro-prism reflective film with two different three-prisms on a reflective material substrate, i.e. a micro-prism reflective film with a double three-prism combined structure;

[0014] 2) The micro-prism reflective film with a double three-prism combined structure of the present application has the first group of three-prisms located at the corners and the fourth three-prism located at the center adjacent to each other; the effective retroreflective area of the large three-prism composed of four small three-prisms is the same as that of the equivalent large three-prism, and the retroreflective performance of the two is the same;

[0015] 3) The fourth triangular pyramid in the center is designed differently from the first group of triangular pyramids in the corners (including the design of the triangular pyramid angle and the 180-degree opposite orientation), adjusting the newly added angle variable of the fourth triangular pyramid in the center can achieve the optimization of the wide-angle performance of the reflective film, or obtain the optimization balance of the 0-degree and 90-degree performance of the reflective film, which is beneficial to realize the performance that other complex structures (such as full prism) reflective films can achieve (while the full prism reflective film and the mold are very complex and high in cost), and the mold structure complexity and processing technology difficulty of the present application are simpler than those of the full prism structure reflective film mold;

[0016] 4) Unlike conventional single triangular pyramid structures, the present application increases the angle variable of the reflective film design, thereby realizing the improvement of the performance of the reflective film, especially the improvement of the wide-angle performance and the balance of different orientation performance; such a double-triangular pyramid combined structure micro-prism reflective film is suitable for small triangular pyramid (≤175um) units or large triangular pyramid (≥225um) units.

[0017] 5) The present application can achieve the performance of complex full prism reflective film, but the manufacturing process and difficulty of the present application mold are greatly reduced, thereby being beneficial to save production cost and industrialized production. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in combination with the drawings;

[0019] FIG. 1 is a front view of a conventional corner cube reflector structure;

[0020] FIG. 2 is a front view of a micro-prism reflective film unit of the first embodiment of the present application;

[0021] FIG. 3 is a side view of FIG. 2;

[0022] FIG. 4 is a processing forming diagram of the unit (after the first design cutter processing);

[0023] FIG. 5 is a processing forming diagram of the unit (after the first cutter processing of the second design cutter);

[0024] FIG. 6 is a processing forming diagram of the unit (after the second cutter processing of the second design cutter);

[0025] FIG. 7 is a processing forming diagram of the unit (after the third cutter processing of the second design cutter);

[0026] FIG. 8 is a physical diagram of a micro-prism reflective film mold sample of the first embodiment of the present application (photographed under a 10 times microscope);

[0027] FIG. 9 is a front view of a micro-prism reflective film of the second embodiment of the present application;

[0028] Fig. 10 is a schematic view of the partial configuration of Fig. 9 (i.e. a schematic view of the front configuration of the parallelogram cell);

[0029] Fig. 11 is a schematic view of the placement of the mold base on the worktable for processing;

[0030] Fig. 12 is a schematic view of the cross-sectional configuration of the processing of the mold base using a first tool;

[0031] Fig. 13 is a schematic view of the cross-sectional configuration of the processing of the mold base using a second tool;

[0032] Fig. 14 is a schematic view of the front configuration of the mold product of the second embodiment (for the sake of visual observation, the reference numbers in the figure correspond to those of the reflective film of Fig. 9);

[0033] Fig. 15 is a schematic view of the configuration of the mold base before processing;

[0034] Fig. 16 is a schematic view of the front configuration of Fig. 15;

[0035] Fig. 17 is a schematic view of the front configuration of the mold base of Fig. 15 after Step 1 processing;

[0036] Fig. 18 is a schematic view of the front configuration of the mold base of Fig. 17 after Step 2 processing;

[0037] Fig. 19 is a schematic view of the front configuration of the mold base of Fig. 18 after Step 3 processing;

[0038] Fig. 20 is a schematic view of the configuration of Fig. 19;

[0039] Fig. 21 is a schematic view of the front configuration of the mold base of Fig. 19 after Step 4 processing;

[0040] Fig. 22 is a schematic view of the configuration of Fig. 21;

[0041] Fig. 23 is a schematic view of the front configuration of the mold base of Fig. 21 after Step 5 processing;

[0042] Fig. 24 is a schematic view of the configuration of Fig. 23;

[0043] Fig. 25 is a schematic view of the front configuration of the mold base of Fig. 23 after Step 6 processing;

[0044] Fig. 26 is a schematic view of the configuration of Fig. 25 (i.e. a schematic view of the configuration of the mold product of the second embodiment of the present application);

[0045] Fig. 27 is a schematic view of the front configuration of the reflective film or mold product of the third embodiment of the present application. Embodiments of the present application

[0046] The present application is further described below in conjunction with the accompanying drawings and specific embodiments.

[0047] The micro-prism reflective film of the triangular pyramid combined structure of the first embodiment of the present application is formed by an array of the same unit body 1 (the array is shown in Figure 8, and the left, right, upper and lower adjacent unit bodies 1 are all rotated and staggered by 180 degrees), the bottom surface of the unit body is an equilateral triangle, the three surfaces of the unit body corresponding to the three edges of the bottom surface are the three surfaces of the triangular frustum (the three complete surfaces of the triangular frustum shown in Figure 4 are obtained after subsequent processing), the three frustum surfaces of the unit body are the same (the three frustum surfaces of the unit body shown in Figure 8 are the first frustum surface T1 of the unit body, the second frustum surface T2 of the unit body and the third frustum surface T3 of the unit body respectively), the unit body is composed of three same first triangular pyramids G1, second triangular pyramids G2 and third triangular pyramids G3 located at the corners and a fourth triangular pyramid G4 located at the center, and the first triangular pyramids G1, the second triangular pyramids G2 and the third triangular pyramids G3 constitute a first group of triangular pyramids.

[0048] The two edge surfaces of the first triangular pyramid G1, the second triangular pyramid G2 and the third triangular pyramid G3 all share two frustum surfaces of the unit body, that is, the first edge surface G11 of the first triangular pyramid and the second edge surface G12 of the first triangular pyramid share the first frustum surface T1 of the unit body and the second frustum surface T2 of the unit body; the first edge surface G21 of the second triangular pyramid and the second edge surface G22 of the second triangular pyramid share the second frustum surface T2 of the unit body and the third frustum surface T3 of the unit body; and the first edge surface G31 of the third triangular pyramid and the second edge surface G32 of the third triangular pyramid share the third frustum surface T3 of the unit body and the first frustum surface T1 of the unit body.

[0049] That is, the first edge surface G11 of the first triangular pyramid and the second edge surface G32 of the third triangular pyramid share the first frustum surface T1 of the unit body; the second edge surface G12 of the first triangular pyramid and the first edge surface G21 of the second triangular pyramid share the second frustum surface T2 of the unit body; and the second edge surface G22 of the second triangular pyramid and the first edge surface G31 of the third triangular pyramid share the third frustum surface T3 of the unit body.

[0050] The third edge surfaces of the first triangular pyramid, the second triangular pyramid and the third triangular pyramid are all parallel to the third frustum surface T3 of the unit body, the first frustum surface T1 of the unit body and the second frustum surface T2 of the unit body, that is, the third edge surface G13 of the first triangular pyramid is parallel to the third frustum surface T3 of the unit body, the third edge surface G23 of the second triangular pyramid is parallel to the first frustum surface T1 of the unit body, and the third edge surface G33 of the third triangular pyramid is parallel to the second frustum surface T2 of the unit body (see Figure 7).

[0051] The angles between the three edges (corner cube reflecting surfaces) of the fourth triangular pyramid and the bottom surface of the unit body are different from the angles between the edges (corner cube reflecting surfaces) of the first triangular pyramid, the second triangular pyramid and the third triangular pyramid and the bottom surface, so that the first triangular pyramid, the second triangular pyramid and the third triangular pyramid are different from the fourth triangular pyramid.

[0052] The first group of triangular pyramids (including the first triangular pyramid, the second triangular pyramid and the third triangular pyramid) realize the main retroreflective performance of the retroreflective film, and the fourth triangular pyramid adjusts or compensates the wide-angle retroreflective performance or the retroreflective performance in other orientations of the retroreflective film.

[0053] In an example of the first embodiment, the length of the bottom surface of the unit body is 350 um, the length of the bottom surface of the first triangular pyramid, the second triangular pyramid and the third triangular pyramid is 175 um, the height of the triangular pyramid is 71.4 um, and the angle between the third edge of the first triangular pyramid, the second triangular pyramid and the third triangular pyramid and the vertical surface passing through the bottom edge is 35.28 degrees; the length of the bottom surface of the fourth triangular pyramid is 175 um, the height of the triangular pyramid is 71.22 um, and the angle between the edge of the fourth triangular pyramid and the vertical surface passing through the bottom edge is 35.35 degrees.

[0054] In another example of the first embodiment, the length of the bottom surface of the unit body is 500 um, the length of the bottom surface of the first triangular pyramid, the second triangular pyramid and the third triangular pyramid is 250 um, the height of the triangular pyramid is 102 um, and the angle between the third edge of the first triangular pyramid, the second triangular pyramid and the third triangular pyramid and the vertical surface passing through the bottom edge is 35.28 degrees; the length of the bottom surface of the fourth triangular pyramid is 250 um, the height of the triangular pyramid is 101.74 um, and the angle between the edge of the fourth triangular pyramid and the vertical surface passing through the bottom edge is 35.35 degrees.

[0055] In the first embodiment, the three edge surfaces of the unit body are formed by a first triangular pyramid forming tool, the third edge of the first triangular pyramid, the second triangular pyramid and the third triangular pyramid and the three edges of the fourth triangular pyramid are formed by a second triangular pyramid forming tool; the first triangular pyramid forming tool has an angle of 70.56°, and the second triangular pyramid forming tool has an angle of 70.63.

[0056] The optical structure principle of the micro-prism reflective film of the first embodiment of the present application is as follows: the combined unit (unit body 1) structure is a large triangular prism (i.e. the aforementioned triangular prism table, the name of large triangular prism is relative to each small triangular prism, for example, a=350 microns) with four small triangular prism units (including the first triangular prism, the second triangular prism, the third triangular prism and the fourth triangular prism) in the area with a bottom side length of a; wherein the first triangular prism, the second triangular prism and the third triangular prism located in the corners of the large triangular prism have equilateral triangle bottom surfaces with the same area, and the side length b of the equilateral triangle bottom surface is half of the bottom side length a of the large triangular prism (for example, b=175 microns); as shown in FIGS. 2 and 3, according to the geometric principle, it is obvious that the bottom surface of the fourth triangular prism located in the center of the large triangular prism is also an equilateral triangle, and the side length b of the equilateral triangle is also half of the bottom side length a of the large triangular prism (for example, b=175 microns), therefore, the bottom surfaces of the four small triangular prisms located in the large triangular prism area are completely the same, and are equilateral triangles with the same area; due to this structure, the new reflective film can be called a "3+1" triangular prism combined structure micro-prism reflective film.

[0057] The corner triangular prisms (the first group of triangular prisms) accounting for 75% of the area of the reflective film realize the main retroreflective performance of the reflective film, and the central triangular prism (the fourth triangular prism) accounting for 25% of the area of the reflective film adjusts or compensates the wide-angle retroreflective performance or the retroreflective performance in other orientations of the reflective film, so as to realize the improvement, optimization and balance of the overall performance.

[0058] The processing steps of the micro-prism reflective film with the triangular prism combined structure of the first embodiment of the present application are as follows:

[0059] (1) first, use the first angle designed cutter to perform forming processing of the triangular prism table (the processing depth is greater than or equal to the height h of any small triangular prism), as shown in FIG. 4;

[0060] (2) use the second angle designed cutter to process the first cutter along the direction of the center line of the two bottom edges of the triangular prism table, to form the third surface of the corner first triangular prism and the first surface of the central fourth triangular prism, as shown in FIG. 5;

[0061] (3) use the second angle designed cutter to process the second cutter along the direction of the center line of the two bottom edges of the triangular prism table, to form the third surface of the corner second triangular prism and the second surface of the central fourth triangular prism, as shown in FIG. 6;

[0062] (4) use the second angle designed cutter to process the third cutter along the direction of the center line of the two bottom edges of the triangular prism table, to form the third surface of the corner third triangular prism and the third surface of the central fourth triangular prism, as shown in FIG. 7.

[0063] (5) The micro-prism retroreflective film mold sample of the "3+1" triangular pyramid combined structure processed, as shown in Figure 8, and the retroreflective performance is tested.

[0064] The first angle design tool (or the first triangular pyramid forming tool) and the second angle design tool (or the second triangular pyramid forming tool) are symmetrical tools, and neither of the two tools has an offset angle.

[0065] The important technical innovation breakthrough of the present application lies in the improvement of the performance of the micro-prism retroreflective film, the balance of the wide-angle performance and the small-angle performance, the balance of the 0-degree and 90-degree orientation performance, which is conducive to achieving the performance that other complex structures (such as full-prism) retroreflective films can achieve; the mold structure complexity and processing technology difficulty are simpler than those of the full-prism structure retroreflective film mold.

[0066] The traditional triangular pyramid retroreflective film mold adopts a tool with one angle design to realize the forming of the three faces of the triangular pyramid. This design has only one angle variable, and it is difficult to balance the wide-angle performance and the small-angle performance, and the balance of the 0-degree and 90-degree orientation performance, which is difficult to meet the actual application of the high requirements of the performance of the retroreflective film.

[0067] The advantages of the micro-prism retroreflective film with the triangular pyramid combined structure of the first embodiment of the present application are as follows:

[0068] 1) The first embodiment can realize two different micro-prism retroreflective films with triangular pyramid optical structures on one retroreflective material substrate, i.e., a micro-prism retroreflective film with a double triangular pyramid combined structure.

[0069] 2) The micro-prism retroreflective film with the triangular pyramid combined structure of the first embodiment has the first group of triangular pyramids located at the corners and the fourth triangular pyramid located at the center, which are adjacent to each other. The effective retroreflective area of the large triangular pyramid composed of four small triangular pyramids is the same as that of the equivalent large triangular pyramid, and the retroreflective performance of the two is the same.

[0070] 3) The fourth triangular pyramid located at the center is designed differently from the first group of triangular pyramids located at the corners (including the triangular pyramid angle design and the 180-degree opposite orientation), and the newly added angle variable of the fourth triangular pyramid located at the center can optimize the wide-angle performance of the retroreflective film, or achieve the optimized balance of the 0-degree and 90-degree performance of the retroreflective film, which is conducive to achieving the performance that other complex structures (such as full-prism) retroreflective films can achieve (while the full-prism retroreflective film and the mold are very complex and high in cost), and the mold structure complexity and processing technology difficulty are simpler than those of the full-prism structure retroreflective film mold.

[0071] 4) Different from the conventional monomer triangular pyramid structure, the first embodiment increases the angle variable of the reflective film design, thereby improving the performance of the reflective film, especially the wide-angle performance and the balance of different orientation performance; the double-triangular pyramid combined structure micro-prism reflective film is suitable for the reflective film structure of small triangular pyramid (≤175um) unit or large triangular pyramid (≥225um) unit.

[0072] 5) The first embodiment can achieve the performance of complex full-prism reflective film, but the mold manufacturing process and difficulty are greatly reduced, thereby saving production cost and facilitating industrial production.

[0073] The micro-prism reflective film of the second embodiment of the triangular pyramid combined structure, the surface of the micro-prism reflective film of the embodiment is formed by an array of same parallelogram unit bodies 01, each parallelogram unit body 01 is composed of two same triangular pyramids A, four mixed triangular pyramids B and two mixed triangular pyramids C, the bottom surface of the triangular pyramid A, the mixed triangular pyramid B and the mixed triangular pyramid C is a same equilateral triangle, the three corner surface inclinations of the two triangular pyramids A are α / 2, the corner surface inclinations of the mixed triangular pyramid B are α / 2, α / 2 and β / 2, and the three corner surface inclinations of the mixed triangular pyramid C are α / 2, β / 2 and β / 2; the triangular pyramid A is triangular pyramid A1 and triangular pyramid A2, the mixed triangular pyramid B is triangular pyramid B1, triangular pyramid B2, triangular pyramid B3 and triangular pyramid B4, and the mixed triangular pyramid C is triangular pyramid C1 and triangular pyramid C2, the first row of the parallelogram unit body 01 is sequentially triangular pyramid A1, triangular pyramid B1, triangular pyramid C1 and triangular pyramid B2, the second row of the parallelogram unit body 01 is sequentially triangular pyramid B3, triangular pyramid C2, triangular pyramid B4 and triangular pyramid A2, and the directions of adjacent triangular pyramids are 180 degrees to each other, as shown in FIG. 9.

[0074] The array intercept of the micro-prism reflective film of the second embodiment is 0.433mm, each parallelogram unit body 01 of the micro-prism reflective film contains 8 triangular pyramids with a bottom side length of 250um; α=70.55 degrees and β=70.75 degrees.

[0075] The corner surface B301 of the triangular pyramid B3 of the second embodiment is coplanar with the corner surface B401 of the triangular pyramid B4, the corner surface B101 of the triangular pyramid Bl is coplanar with the corner surface B201 of the triangular pyramid B2, the corner surface B302 of the triangular pyramid B3 is coplanar with the corner surface AlOl of the triangular pyramid Al, the corner surface A201 of the triangular pyramid A2 is coplanar with the corner surface B202 of the triangular pyramid B2, the corner surface B402 of the triangular pyramid B4 is coplanar with the corner surface Al02 of the triangular pyramid Al, the corner surface A202 of the triangular pyramid A2 is coplanar with the corner surface Bl02 of the triangular pyramid Bl, the corner surface Al03 of the triangular pyramid Al is coplanar with the corner surface ClOl of the triangular pyramid Cl, the corner surface C201 of the triangular pyramid C2 is coplanar with the corner surface A203 of the triangular pyramid A2, the corner surface C202 of the triangular pyramid C2 is coplanar with the corner surface Bl03 of the triangular pyramid Bl, and the corner surface B403 of the triangular pyramid B4 is coplanar with the corner surface Cl02 of the triangular pyramid Cl (as shown in FIGS. 9 and 10).

[0076] The processing method of the mold for manufacturing the microprismatic reflective film of the triangular pyramid combination structure of the second embodiment is as follows.

[0077] As shown in FIG. 11, the mold base K1 is horizontally mounted on the workbench K2, the workbench can drive the mold base to move along the horizontal direction X axis and Y axis, and the B axis turntable on the workbench can drive the mold base to rotate around the normal line B axis of the mold base, the upper side of the mold base is provided with a main shaft K3 parallel to the upper surface of the mold base and a fly cutter disc K4 fixedly connected with the main shaft, the main shaft K3 can be driven to rotate by the existing machine tool equipment, the cutter K5 is mounted on the fly cutter disc, and the cutter can be driven to rotate around the Y axis by the main shaft, and the specific steps during manufacturing are as follows.

[0078] Step 1: rotate the mold base on the B axis turntable to 0 degree (or 180 degrees) (i.e., the state shown in FIG. 16), and use the first cutter array with a cutter angle of a installed on the fly cutter disc to process the two side corner surfaces of the parallelogram unit body (i.e., the upper and lower side corner surfaces in FIG. 17, the workbench drives the mold base to move along the X axis during the processing process), i.e., the corner surface B301 of the triangular pyramid B3, the corner surface B401 of the triangular pyramid B4, the corner surface BlOl of the triangular pyramid Bl, and the corner surface B201 of the triangular pyramid B2, the inclination angle is a / 2, the first cutter is a symmetrical cutter, the inclination angles of the two sides are the same, a=70.55 degrees in one embodiment, and the inclination angles of the two sides are both 35.275 degrees, as shown in FIG. 17.

[0079] Step 2: Rotate the mold base on the B-axis rotary table to 120 degrees (or 300 degrees) (i.e. rotate 120 degrees (or 300 degrees) counterclockwise around the center of the B-axis in the state shown in Figure 16), use the first tool array with tool angle a installed on the fly cutter disc to machine the other two side cone surfaces of the parallelepiped unit (i.e. the left and right side cone surfaces of Figure 18, during the machining process the workbench drives the mold base to move along the X-axis direction), that is, the corner cone surface B302 of the triangular pyramid B3, the corner cone surface A101 of the triangular pyramid A1, the corner cone surface A201 of the triangular pyramid A2 and the corner cone surface B202 of the triangular pyramid B2, the inclination angle is also a / 2, as shown in Figure 18.

[0080] Step 3: Rotate the mold base on the B-axis rotary table to 60 degrees (or 240 degrees) (i.e. rotate 60 degrees (or 240 degrees) counterclockwise around the center of the B-axis in the state shown in Figure 16), use the first tool array with tool angle a installed on the fly cutter disc to machine the two pairs of diagonal cone surfaces of the parallelepiped unit 01, that is, the corner cone surface B402 of the triangular pyramid B4, the corner cone surface A102 of the triangular pyramid A1, the corner cone surface A202 of the triangular pyramid A2 and the corner cone surface B102 of the triangular pyramid B1, the inclination angle is also a / 2, as shown in Figures 19 and 20.

[0081] Step 4: On the basis of the structure machined in step 3, rotate the mold base to the 0 degree position (i.e. the position shown in Figure 16), use the first tool array to machine the corner cone surface C201 of the triangular pyramid C2 and the corner cone surface A203 of the triangular pyramid A2, the inclination angle is a / 2; at the same time, machine the corner cone surface A103 of the triangular pyramid A1 and the corner cone surface C101 of the triangular pyramid C1, the inclination angle is a / 2; as shown in Figures 21 and 22.

[0082] Step 5: Replace the second tool with symmetric structure and tool angle β on the fly cutter disc, the left and right tool edges of the second tool have an inclination angle of β / 2, sequentially rotate the mold base to 120 degrees (i.e. rotate 120 degrees counterclockwise around the center in the position shown in Figure 16), use the second tool array to machine the corner cone surface C202 of the triangular pyramid C2 and the corner cone surface B103 of the triangular pyramid B1, the inclination angle is β / 2, at the same time, machine the corner cone surface B403 of the triangular pyramid B4 and the corner cone surface C102 of the triangular pyramid C1, the inclination angle is β / 2; as shown in Figures 23 and 24.

[0083] Step 6: Sequentially rotate the mold base to 60 degrees (i.e. rotate 60 degrees counterclockwise around the center in the position shown in Figure 16), use the second tool array adjusted as described above to machine the corner cone surface C203 of the triangular pyramid C2 and the corner cone surface B203 of the triangular pyramid B2, the inclination angle is β / 2, at the same time, machine the corner cone surface B303 of the triangular pyramid B3 and the corner cone surface C103 of the triangular pyramid C1, the inclination angle is β / 2; as shown in Figures 25 and 26.

[0084] Fig. 25, 26 are also schematic diagrams of the structure of the mold product of the present application, and Fig. 25, 26 are the same as Fig. 14. They are both schematic diagrams of the structure of the mold for making the reflective film of the present application, and the shape and size of the mold obtained by the above-mentioned processing method are the same as the reflective film subsequently formed by the mold, and in order to facilitate intuitive viewing, therefore the same reference numerals are used in Fig. 14 and Fig. 25, 26 to embody the one-to-one correspondence of the mold and the reflective film.

[0085] At this point, the mold of the micro-prism reflective film composed of three different types of triangular pyramids, triangular pyramids A with an inclination angle of α / 2, mixed triangular pyramids B with inclination angles of α / 2, α / 2 and β / 2, and mixed triangular pyramids C with inclination angles of α / 2, β / 2 and β / 2, is processed and formed.

[0086] A specific processing example of the second embodiment: the first tool has a symmetric tool angle of α = 70.55 degrees (no offset angle); the second tool has a symmetric tool angle of β = 70.75 degrees (no offset angle); during processing, the first tool is used first, and array processing is performed according to B-axis rotation angles of 0 degrees, 60 degrees, 120 degrees and 0 degrees, and a cutting interval of 0.433 mm (refer to the aforementioned steps 1-4 and Fig. 16-22); the second tool is replaced, and the fifth and sixth tools are array processed according to B-axis rotation angles of 120 degrees and 60 degrees, respectively, and a cutting interval of 0.433 mm; a mold of a composite micro-prism reflective film composed of parallel quadrilateral unit arrays is processed and formed (refer to the aforementioned steps 5-6 and Fig. 21-26), and each parallel quadrilateral unit contains 8 triangular pyramids, of which 2 triangular pyramids A have reflection surfaces with an inclination angle of α / 2, 4 triangular pyramids B have reflection surfaces with inclination angles of α / 2, α / 2 and β / 2, and 2 triangular pyramids C have reflection surfaces with inclination angles of α / 2, β / 2 and β / 2, and the area ratio of triangular pyramids A (α / 2, α / 2, α / 2), triangular pyramids B (α / 2, α / 2, β / 2) and triangular pyramids C (α / 2, β / 2, β / 2) is 1:2:1.

[0087] In order to improve processing efficiency, the first tool (step 1) and the fourth tool (step 4) in the above-mentioned processing steps can be performed together (both steps are at a position of 0 degrees, i.e. the B-axis does not need to be rotated, and only the Y-axis of the base material needs to be moved).

[0088] The mold obtained by the above-mentioned processing is further processed to obtain a reflective film by using existing conventional technical means (which is prior art and will not be described in detail here).

[0089] The micro-prism retroreflective film of the first embodiment ("Micro-prism retroreflective film with double-triangular pyramid combined structure and manufacturing method of its mold" (publication number CN118759624B)) can optimize the wide-angle performance of the retroreflective film to a certain extent or obtain a certain degree of optimization of the 0-degree and 90-degree performance of the retroreflective film by adjusting the angle variable of the triangular pyramid located at the center, although the micro-prism retroreflective film with the triangular pyramid combined structure is processed by using the first cutter with a tool angle of α to process the large triangular pyramid and then using the second cutter with a tool angle of β (a total of 6 cutter processing and 6 steps). Although the micro-prism retroreflective film has two degrees of freedom in design, there is still a lack of freedom in optical design optimization (the second embodiment optimizes the lack of freedom to a certain extent).

[0090] The second embodiment of the present application has the following technical advantages:

[0091] 1. Area ratio optimization: The second embodiment adopts an area ratio of 25%:50%:25% for the three triangular pyramids ABC, which is different from the area ratio of the triangular pyramids in the first embodiment, providing a new way to improve the wide-angle retroreflective performance of the retroreflective film.

[0092] 2. Convenient optimization design: The wide-angle retroreflective performance of the retroreflective film is improved by selecting α and β and optimizing the area ratio.

[0093] 3. Simple processing technology: The first cutter α can be used to fly-cut four knives, and the second cutter β can be used to fly-cut two knives, which is simpler and less costly than the manufacturing of the full-prism mold of 3M Company.

[0094] 4. Design verification is simple: The pure triangular pyramid A (α / 2, α / 2, α / 2) can be optimized and verified first, then the mixed triangular pyramids B (α / 2, α / 2, β / 2) and C (α / 2, β / 2, β / 2) can be optimized and verified, and finally the double-triangular pyramid combined structure A+B+C can be verified, which facilitates verification.

[0095] The third embodiment of the present application is a method for manufacturing a micro-prism retroreflective film with a triangular pyramid combined structure. The mold base K1 is horizontally installed on the workbench K2, which can move the mold base along the X-axis and Y-axis in the horizontal direction, and the B-axis turntable on the workbench can rotate the mold base around the normal B-axis of the mold base. A spindle K3 parallel to the upper surface of the mold base and a fly cutter disc K4 fixedly connected to the spindle are provided above the mold base. Replaceable cutters K5 are installed on the fly cutter disc, which can rotate around the Y-axis under the drive of the spindle. The specific steps during manufacturing are as follows:

[0096] S1, rotate the mold base material on the B-axis turntable to 0 degrees, 120 degrees and 60 degrees respectively, and use the first tool array with a tool angle of a installed on the fly cutter to process the four side cone surfaces and two opposite cone surfaces of the parallelogram unit body 01, that is, the first tool to the third tool, the first tool is a symmetrical tool (the tool has no offset angle), the two side angles are the same, and the cone surface angles of the processed mold are a / 2;

[0097] S2, on the basis of the structure processed in step S1, rotate the mold base material to 0 degrees, 120 degrees and 60 degrees, and perform the fourth tool to the sixth tool array processing, two tools in the fourth tool to the sixth tool processing use the first tool to process, and the other tool uses the second tool to process (the tool has no offset angle), the second tool is a symmetrical tool, the two side angles are the same, and the cone surface angles of the processed mold are b / 2;

[0098] At this point, the micro-prism reflective film of the three-prism pyramid combined structure is obtained, and the two three-prism pyramids are three-prism pyramid E and three-prism pyramid F, the area ratio of the three-prism pyramid E and the three-prism pyramid F is 50:50, the three cone surface angles of each three-prism pyramid E are a / 2, the two cone surface angles of each three-prism pyramid F are a / 2, and the cone surface angle of each three-prism pyramid F is b / 2.

[0099] In the fourth tool to the sixth tool processing, two tools use the first tool to process, and the other tool uses the second tool to process, for example, the fourth tool uses the second tool to process, and the fifth tool and the sixth tool use the first tool to process; for example, the fifth tool uses the second tool to process, and the fourth tool and the sixth tool use the first tool to process; or the sixth tool uses the second tool to process, and the fourth tool and the fifth tool use the first tool to process.

[0100] Taking the fourth tool using the second tool to process and the fifth tool and the sixth tool using the first tool to process as an example, the specific processing steps are as follows:

[0101] Step 1 (first tool): rotate the mold base material on the B-axis turntable to 0 degrees (or 180 degrees) (i.e., the state shown in FIG. 16), and use the first tool array with a tool angle of a installed on the fly cutter to process the two side cone surfaces of the parallelogram unit body (i.e., the upper and lower side cone surfaces in FIG. 17, and the mold base material is moved along the X-axis direction during the processing process).

[0102] Step 2 (second tool): rotate the mold base material on the B-axis turntable to 120 degrees (or 300 degrees) (i.e., rotate 120 degrees (or 300 degrees) counterclockwise around the center of the B-axis in the state shown in FIG. 16), and use the first tool array with a tool angle of a installed on the fly cutter to process the other two side cone surfaces of the parallelogram unit body (i.e., the left and right side cone surfaces in FIG. 18, and the mold base material is moved along the X-axis direction during the processing process).

[0103] Step 3 (3rd tool): Rotate the mold base on the B-axis rotary table to 60 degrees (or 240 degrees) (i.e. rotate 60 degrees (or 240 degrees) counterclockwise around the center of the B-axis in the state shown in FIG. 16), and use the 1st tool array with a tool angle of a installed on the fly cutter to process the two diagonal conical surfaces of the parallelepiped unit 01, as shown in FIGS. 18 and 19.

[0104] Step 4 (4th tool): On the basis of the structure processed in step 3, rotate the mold base to the 0-degree position (i.e. the position shown in FIG. 16), and use the 2nd tool array to process the conical surfaces with an inclination angle of β / 2 during the movement of the workbench along the X-axis direction, as shown in FIGS. 21 and 22.

[0105] Step 5 (5th tool): In sequence, rotate the mold base to 120 degrees (i.e. rotate 120 degrees counterclockwise around the center in the position shown in FIG. 16), and use the 1st tool array to process, as shown in FIGS. 23 and 24.

[0106] Step 6 (6th tool): In sequence, rotate the mold base to 60 degrees (i.e. rotate 60 degrees counterclockwise around the center in the position shown in FIG. 16), and use the 1st tool array to process, as shown in FIGS. 25 and 26.

[0107] The third embodiment of the above-mentioned FIGS. 16-26 is filled with different cross-section lines or points only to distinguish the edges (the same cross-section lines or points do not mean the same edge angle), and the schematic diagram of the micro-prism reflective film or mold of the three-pyramid combined structure of the third embodiment is shown in FIG. 27.

[0108] In a specific embodiment of the mold manufacturing method of the third embodiment, the tool angle of the 1st tool is 70.55 degrees, the tool angle of the 2nd tool is 70.90 degrees, the 1st tool to the 3rd tool are processed using the 1st tool, the mold base is rotated to 0 degrees, 120 degrees and 60 degrees, respectively, and the array spacing is 0.433 mm; the 4th tool and the 5th tool are processed using the 1st tool, the mold base is rotated to 0 degrees and 120 degrees, respectively, and the array spacing is 0.433 mm; the 6th tool is processed using the 2nd tool, the mold base is rotated to 60 degrees, and the array spacing is 0.433 mm; and a micro-prism reflective film mold integrated with two three-pyramid combined structures is formed: the three-pyramid edge length is 250 microns, and the area ratio of the three-pyramid E and the three-pyramid F is 1:1 (as shown in FIG. 27).

[0109] The third embodiment is compared with the comparative example. The comparative example is different from the third embodiment in that a fly cutter is used to process three knives to form a triangular pyramid, the fly cutter is designed with a knife angle a = 70.55°, the first knife to the third knife equipment rotation shaft B axis is respectively 0°, 60° and 120°, and the array spacing is 0.2165mm. The single triangular pyramid structure sample processed and formed has a triangular pyramid side length of 250 microns, and the three cone angles of the triangular pyramid are a / 2, a / 2 and a / 2.

[0110] The test data of the third embodiment and the comparative example are as follows:

[0111]

[0112] Compared with the comparative example, the third embodiment of the present application solves the problem that the retroreflective performance cannot meet the V-class standard under the test conditions of (observation angle 0.5°, incident angle 30°), (observation angle 1°, incident angle -4°), (observation angle 1°, incident angle 15°), (observation angle 1°, incident angle 30°), and at the same time, by reducing the overfitting performance of the 0.2° observation angle, the retroreflective performance of the 0.5° observation angle is improved.

[0113] The mold made by the third embodiment manufacturing method produces a micro-prism retroreflective film integrating two kinds of triangular pyramids. The surface of the micro-prism retroreflective film is formed by an array of identical parallelogram unit bodies 01. Each parallelogram unit body 01 is composed of four identical triangular pyramids E and four hybrid triangular pyramids F. The base of the triangular pyramids E and the hybrid triangular pyramids F are identical equilateral triangles. The area ratio of the triangular pyramids E to the hybrid triangular pyramids F is 1:1. The three cone angles of each triangular pyramid E are a / 2, and the two cone angles of each hybrid triangular pyramid F are a / 2, and the one cone angle of each hybrid triangular pyramid F is β / 2 (as shown in FIG. 27).

[0114] Wherein a = 70.55 degrees, and β = 70.90 degrees; the array intercept of the micro-prism retroreflective film is 0.433mm.

[0115] Further, in order to better illustrate the technical effect of the third embodiment (Example 1 below) compared with the first embodiment (Comparative Example 1 below), the following Comparative Example 1 sample is made.

[0116] Comparison of the retroreflective performance test data of the two samples:

[0117] [Corrected according to Rule 26 08.09.2025]

[0118] The retroreflective performance of the comparative example 1 sample is mainly distributed at a small observation angle of 0.2 degrees, and cannot meet the requirements of the five categories (category V) under the following four test conditions: an incident angle of 30 degrees and an observation angle of 0.5 degrees, an incident angle of 30 degrees and an observation angle of 1 degree, an incident angle of 15 degrees and an observation angle of 1 degree, and an incident angle of -4 degrees and an observation angle of 1 degree (i.e., the red part in the screenshot of the comparative example 1).

[0119] Therefore, the third embodiment of the present application has the following technical advantages.

[0120] 1. Area ratio optimization. The area ratio of the third embodiment of the triangular pyramid E and the mixed triangular pyramid F is 50:50 (as shown in FIG. 27). Compared with the "micro-prism retroreflective film with a double-triangular pyramid combined structure and a manufacturing method of a mold thereof" (publication number CN118759624B, i.e., the first embodiment of the present application), the area ratio of the triangular pyramid F is increased from 25% to 50%, which is beneficial to improving the wide-angle retroreflective performance of the retroreflective film.

[0121] 2. Easy optimization design. The wide-angle retroreflective performance of the retroreflective film can be optimized and improved by selecting only one cone angle β / 2 of the triangular pyramid F.

[0122] 3. Simple processing technology. Five knives of the first type α are used for fly cutting, and one knife of the second type β is used for fly cutting, which is much simpler and less costly than the manufacturing of the 3M full-prism mold.

[0123] 4. Simple design verification. First, optimize and verify the pure triangular pyramid E (α / 2, α / 2, α / 2), then optimize and verify the mixed triangular pyramid F (α / 2, α / 2, β / 2), and finally verify the double-triangular pyramid combined structure A+B, which is simple to verify.

[0124] It should be pointed out finally that the above examples are only used to illustrate the technical solutions of the present application but not to limit it; although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, which should be covered in the technical solution range claimed by the present application.

Claims

1. A microprismatic retroreflective film of triangular pyramid combination structure, characterized by: The surface of the micro-prism reflective film is formed by an array of identical unit bodies (1), the upper, lower, left and right adjacent unit bodies (1) are rotated and staggered by 180 degrees, the bottom surface of the unit body is an equilateral triangle, the three surfaces of the unit body corresponding to the three edges of the bottom surface are the three surfaces of a triangular frustum, the three frustum surfaces of the unit body are the same, the three frustum surfaces of the unit body are the first frustum surface T1 of the unit body, the second frustum surface T2 of the unit body and the third frustum surface T3 of the unit body, respectively, the unit body is composed of three identical first triangular pyramids G1, second triangular pyramids G2 and third triangular pyramids G3 located at the corners and a fourth triangular pyramid G4 located at the center, the first triangular pyramids G1, the second triangular pyramids G2 and the third triangular pyramids G3 form a first group of triangular pyramids; wherein the two edge surfaces of the first triangular pyramid G1, the second triangular pyramid G2 and the third triangular pyramid G3 each share two edge surfaces of the unit body, and the third edge surface of the first triangular pyramid, the second triangular pyramid and the third triangular pyramid is parallel to the third frustum surface T3 of the unit body, the first frustum surface T1 of the unit body and the second frustum surface T2 of the unit body, respectively. The angles between the three edge surfaces of the fourth triangular pyramid G4 and the bottom surface of the unit body are different from the angles between the edge surfaces of the first triangular pyramid G1, the second triangular pyramid G2 and the third triangular pyramid G3 and the bottom surface, so that the first triangular pyramid G1, the second triangular pyramid G2 and the third triangular pyramid G3 are different from the fourth triangular pyramid G4, The first group of triangular pyramids realizes the main retroreflective performance of the reflective film, and the fourth triangular pyramid G4 adjusts or compensates the wide-angle retroreflective performance or other orientation retroreflective performance of the reflective film.

2. The microprismatic film of claim 1, wherein: The second edge surface G12 of the first triangular pyramid and the first edge surface G21 of the second triangular pyramid share the second frustum surface T2 of the unit body; the second edge surface G22 of the second triangular pyramid and the first edge surface G31 of the third triangular pyramid share the third frustum surface T3 of the unit body; and the second edge surface G32 of the third triangular pyramid and the first edge surface G11 of the first triangular pyramid share the first frustum surface T1 of the unit body. The third edge surface G13 of the first triangular pyramid is parallel to the third frustum surface T3 of the unit body, the third edge surface G23 of the second triangular pyramid is parallel to the first frustum surface T1 of the unit body, and the third edge surface G33 of the third triangular pyramid is parallel to the second frustum surface T2 of the unit body.

3. A manufacturing method of a mold of a micro-prism reflective film with a triangular pyramid combination structure, for manufacturing the mold of the micro-prism reflective film with the triangular pyramid combination structure according to any one of claims 1 or 2, characterized in that: Step 1: using a first triangular pyramid forming tool to process the three frustum surfaces of the unit body to form a triangular frustum; Step 2: using a second triangular pyramid forming tool to process the third edge surface of the first triangular pyramid G1, the second triangular pyramid G2 and the third triangular pyramid G3 along the center line direction of the bottom edge of the unit body, respectively, and simultaneously forming the three edge surfaces of the fourth triangular pyramid G4, to process a sample of the mold of the micro-prism reflective film with the triangular pyramid combination structure.

4. A microprismatic retroreflective film of triangular pyramid combination structure, characterized by: The surface of the micro-prism reflective film is formed by an array of identical parallelogram unit bodies (1), each of which is composed of two identical triangular pyramids A, four mixed triangular pyramids B, and two mixed triangular pyramids C. The base of each triangular pyramid A, mixed triangular pyramid B, and mixed triangular pyramid C is an identical equilateral triangle. The three corner faces of each triangular pyramid A have an inclination angle of α / 2. The corner faces of the mixed triangular pyramid B have inclination angles of α / 2, α / 2, and β / 2. The three corner faces of the mixed triangular pyramid C have inclination angles of α / 2, β / 2, and β / 2. The triangular pyramids A are triangular pyramid A1 and triangular pyramid A2. The mixed triangular pyramids B are triangular pyramid B1, triangular pyramid B2, triangular pyramid B3, and triangular pyramid B4. The mixed triangular pyramids C are triangular pyramid C1 and triangular pyramid C2. The first row of the parallelogram unit bodies (1) is sequentially arranged as triangular pyramid A1, triangular pyramid B1, triangular pyramid C1, and triangular pyramid B2. The second row of the parallelogram unit bodies (1) is sequentially arranged as triangular pyramid B3, triangular pyramid C2, triangular pyramid B4, and triangular pyramid A2. The orientations of adjacent triangular pyramids are 180 degrees apart.

5. The microprismatic film of claim 4, wherein: The corner face B301 of the triangular pyramid B3 is coplanar with the corner face B401 of the triangular pyramid B4. The corner face B101 of the triangular pyramid B1 is coplanar with the corner face B201 of the triangular pyramid B2. The corner face B302 of the triangular pyramid B3 is coplanar with the corner face A101 of the triangular pyramid A1. The corner face A201 of the triangular pyramid A2 is coplanar with the corner face B202 of the triangular pyramid B2. The corner face B402 of the triangular pyramid B4 is coplanar with the corner face A102 of the triangular pyramid A1. The corner face A202 of the triangular pyramid A2 is coplanar with the corner face B102 of the triangular pyramid B1. The corner face A103 of the triangular pyramid A1 is coplanar with the corner face C101 of the triangular pyramid C1. The corner face C201 of the triangular pyramid C2 is coplanar with the corner face A203 of the triangular pyramid A2. The corner face C202 of the triangular pyramid C2 is coplanar with the corner face B103 of the triangular pyramid B1. The corner face B403 of the triangular pyramid B4 is coplanar with the corner face C102 of the triangular pyramid C1. The base area ratios of the triangular pyramids A, mixed triangular pyramids B, and mixed triangular pyramids C are 25%, 50%, and 25%, respectively.

6. The microprismatic film of claim 4, wherein: α=70.55 degrees, β=70.75 degrees. The array intercept of the micro-prism reflective film is 0.433 mm.

7. A manufacturing method of a mold for a micro-prism reflective film with a combined structure of triangular pyramids, for manufacturing the mold for the micro-prism reflective film with the combined structure of triangular pyramids as claimed in any one of claims 4-6, characterized in that: The mold base (K1) is horizontally installed on a workbench (K2), which can drive the mold base to move along the X-axis and Y-axis in the horizontal direction, and a B-axis turntable on the workbench can drive the mold base to rotate around the normal line B-axis of the mold base. A main shaft (K3) parallel to the upper surface of the mold base and a fly cutter disc (K4) fixedly connected with the main shaft are arranged above the mold base, and a cutter (K5) is installed on the fly cutter disc. The cutter can rotate around the Y-axis under the drive of the main shaft. The specific steps during manufacturing are as follows: Step 1: Rotate the mold base on the B-axis rotary table to 0 degrees, use the first tool array with tool angle α installed on the fly cutter disc to machine the two side cone surfaces of the parallelepiped unit, i.e. the corner cone surface B301 of the triangular prism B3, the corner cone surface B401 of the triangular prism B4, the corner cone surface B101 of the triangular prism B1 and the corner cone surface B201 of the triangular prism B2, with an inclination angle of α / 2. The first tool is a symmetrical tool with the same inclination angle on both sides. Step 2: Rotate the mold base on the B-axis rotary table to 120 degrees, use the first tool array with tool angle α installed on the fly cutter disc to machine the other two side cone surfaces of the parallelepiped unit, i.e. the corner cone surface B302 of the triangular prism B3, the corner cone surface A101 of the triangular prism A1, the corner cone surface A201 of the triangular prism A2 and the corner cone surface B202 of the triangular prism B2, with an inclination angle of α / 2. Step 3: Rotate the mold base on the B-axis rotary table to 60 degrees, use the first tool array with tool angle α installed on the fly cutter disc to machine the two pairs of corner cone surfaces of the parallelepiped unit (1), i.e. the corner cone surface B402 of the triangular prism B4, the corner cone surface A102 of the triangular prism A1, the corner cone surface A202 of the triangular prism A2 and the corner cone surface B102 of the triangular prism B1, with an inclination angle of α / 2. Step 4: Based on the structure machined in Step 3, rotate the mold base to 0 degrees, use the first tool array to machine the corner cone surface C201 of the triangular prism C2 and the corner cone surface A203 of the triangular prism A2, with an inclination angle of α / 2. At the same time, machine the corner cone surface A103 of the triangular prism A1 and the corner cone surface C101 of the triangular prism C1, with an inclination angle of α / 2. Step 5: Replace the second tool with symmetrical structure and tool angle β on the fly cutter disc. The left and right tool edges of the second tool have an inclination angle of β / 2. Rotate the mold base to 120 degrees in sequence, use the second tool array to machine the corner cone surface C202 of the triangular prism C2 and the corner cone surface B103 of the triangular prism B1, with an inclination angle of β / 2. At the same time, machine the corner cone surface B403 of the triangular prism B4 and the corner cone surface C102 of the triangular prism C1, with an inclination angle of β / 2. Step 6: Rotate the mold base to 60 degrees in sequence, use the second tool array with the above-mentioned adjustment to machine the corner cone surface C203 of the triangular prism C2 and the corner cone surface B203 of the triangular prism B2, with an inclination angle of β / 2. At the same time, machine the corner cone surface B303 of the triangular prism B3 and the corner cone surface C103 of the triangular prism C1, with an inclination angle of β / 2. At this point, the mold of the micro-prism reflective film composed of the triangular prism A with an inclination angle of α / 2, the mixed triangular prism B with inclination angles of α / 2, α / 2 and β / 2, and the mixed triangular prism C with inclination angles of α / 2, β / 2 and β / 2 is machined and formed.

8. A method for manufacturing a micro-prism reflective film with a triangular prism combination structure, characterized in that The mold base material (K1) is horizontally installed on the workbench (K2), the workbench can drive the mold base material to move along the horizontal direction X axis and Y axis, and the B axis turntable on the workbench can drive the mold base material to rotate around the normal line B axis of the mold base material, the upper side of the mold base material is provided with a main shaft (K3) parallel to the upper surface of the mold base material and a fly cutter disc (K4) fixedly connected with the main shaft, the fly cutter disc is provided with replaceable cutters (K5), the cutters can rotate around the Y axis under the driving of the main shaft, the specific steps during manufacturing are as follows: S1, the mold base material on the B axis turntable is rotated to 0 degree, 120 degree and 60 degree respectively, the four side tapered surfaces and two opposite tapered surfaces of the parallelogram unit body 01 are processed by using the first cutter array with the cutter angle α of the cutter installed on the fly cutter disc, that is, the first cutter to the third cutter are processed, the first cutter is a symmetrical cutter, the inclination angles of the two sides are the same, and the inclination angle of the tapered surface of the processed mold is α / 2; S2, on the basis of the structure after the processing in the step S1, the mold base material is rotated to 0 degree, 120 degree and 60 degree, the fourth cutter, the fifth cutter and the sixth cutter array are processed, two cutters are processed by using the first cutter in the fourth cutter, the fifth cutter and the sixth cutter processing, and the other cutter is processed by using the second cutter, the second cutter is a symmetrical cutter, the inclination angles of the two sides are the same, and the inclination angle of the tapered surface of the processed mold is β / 2; Thus, the micro-prism light reflecting film with the three pyramid combined structure is obtained, the two kinds of three pyramids are three pyramid E and three pyramid F, the area ratio of the three pyramid E and the three pyramid F is 50%:50%, the inclination angle of the three tapered surfaces of each three pyramid E is α / 2, the inclination angle of two tapered surfaces of each three pyramid F is α / 2, and the inclination angle of one tapered surface of each three pyramid F is β / 2.

9. The method of claim 8, wherein the microprismatic film is a trapezoidal pyramid combination structure. The fourth cutter is processed by using the second cutter, the fifth cutter and the sixth cutter are processed by using the first cutter; or the fifth cutter is processed by using the second cutter, the fourth cutter and the sixth cutter are processed by using the first cutter; or the sixth cutter is processed by using the second cutter, the fourth cutter and the fifth cutter are processed by using the first cutter. ​ 10. The method of claim 8, wherein the microprismatic film is a trapezoidal pyramid combination structure. The cutter angle of the first cutter is 70.55 degrees, the cutter angle of the second cutter is 70.90 degrees, the first cutter to the third cutter are processed by using the first cutter, the mold base material is rotated to 0 degree, 120 degree and 60 degree respectively, and the array spacing is 0.433 mm; the fourth cutter and the fifth cutter are processed by using the first cutter, the mold base material is rotated to 0 degree and 120 degree respectively, the array spacing is 0.433 mm, the sixth cutter is processed by using the second cutter, the mold base material is rotated to 60 degree, and the array spacing is 0.433 mm; the micro-prism light reflecting film mold integrated with the two kinds of three pyramid combined structure is processed: the three pyramid edge length is 250 microns, and the area ratio of the three pyramid E and the three pyramid F is 1:

1. ​

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