CN212391630U - Reflective film - Google Patents

Abstract

The utility model provides a reflective membrane. The light reflecting film comprises a divergence enhancement layer and a prism layer, wherein the divergence enhancement layer is close to the light incident side relative to the prism layer, a plurality of concave lens units are arranged on the surface of one side of the divergence enhancement layer facing to or deviating from the prism layer, and the concave lens units are arranged on the divergence enhancement layer at intervals and are arranged in an array; one side that the prism layer deviates from the enhancement layer of dispersing is provided with the array unit, and the array unit is a plurality of and adjacent setting in order, and each array unit includes a plurality of triangular pyramid structures of connecting in order, and the geometric center of the apex of the cone projection of each triangular pyramid structure on the awl bottom surface in same array unit. The utility model provides a reflective membrane among the prior art can't effectively reflect incident light to the intraocular problem of observer.

Description

Reflective film

Technical Field

The utility model relates to a safety protection technical field particularly, relates to a reflective membrane.

Background

The luminous film is a special film material prepared by applying a retroreflection principle, can be widely applied to the field of safety protection, and comprises the fields of road traffic signboards, vehicle reflective signs, special operation clothes, fire-fighting signs, railway signs, mine signs and the like, and the safety prompt effect of the luminous film plays an important role in protecting the safety of lives and properties of people. For example, when the reflective film is applied to a road traffic sign, light emitted from a vehicle lamp illuminating the surface of the reflective film can be reflected to the eyes of a driver at night, so that warning information on the sign can be viewed.

The existing reflective film has two structures of glass bead type and microprism type. In the glass bead type reflective film, each glass bead is a retro-reflection unit, and after light irradiates the reflection unit, the retro-reflection process of the light is realized after refraction-reflection-refraction. In the microprism type reflective film, each microprism is a retro-reflection unit, wherein each microprism is composed of three mutually perpendicular reflecting surfaces, and light rays return along the incident direction after being reflected by the three reflecting surfaces in sequence, so that the retro-reflection process is realized. Compared with the glass bead type reflecting film, the microprism type reflecting film has higher retroreflectivity, and the retroreflectivity of the microprism type reflecting film is 3 times or more than that of the glass bead type reflecting film, so the microprism type reflecting film gradually replaces the glass bead type reflecting film.

However, the existing microprismatic light-reflecting films generally have the following problems: 1. the divergence angle is small, the standard micro-prism structure can only realize a strict retro-reflection process, when the light of the car lamp irradiates, the light can only be reflected back to the car lamp, only a small part of the light generates a small divergence angle by means of diffraction of the light, internal defects of the micro-prism structure and deviation of the micro-prism structure, and more light cannot effectively return to the eyes of a driver at all; 2. the effective incident angle is small, the retroreflection coefficient of the existing microprism type reflective film is obviously attenuated along with the incident angle, so that the effective incident angle is only 0-30 degrees, when the incident angle exceeds 30 degrees, the total reflection phenomenon of the microprism disappears, the brightness of the reflective film disappears due to the fact that the incident light cannot be totally reflected, and the reflective performance of the microprism type reflective film is directly determined by the problems.

Therefore, the problem that the reflective film in the prior art cannot effectively reflect the incident light to the eyes of the observer exists.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a reflective film to solve the problem that the reflective film in the prior art cannot effectively reflect incident light to the eyes of the observer.

In order to achieve the above object, the present invention provides a reflective film, which includes a divergence enhancement layer and a prism layer, wherein the divergence enhancement layer is close to the light incident side relative to the prism layer, and a surface of one side of the divergence enhancement layer facing or deviating from the prism layer is provided with a plurality of concave lens units, and the concave lens units are arranged on the divergence enhancement layer at intervals and arranged in an array; one side that the prism layer deviates from the enhancement layer of dispersing is provided with the array unit, and the array unit is a plurality of and adjacent setting in order, and each array unit includes a plurality of triangular pyramid structures of connecting in order, and the geometric center of the apex of the cone projection of each triangular pyramid structure on the awl bottom surface in same array unit.

Furthermore, each array unit comprises four triangular pyramid structures connected in sequence, each triangular pyramid structure is provided with three reflecting surfaces, and the included angle between one reflecting surface and the bottom surface of the pyramid in the same triangular pyramid structure is smaller than the included angles between the other two reflecting surfaces and the bottom surface of the pyramid respectively.

Furthermore, the concave lens units comprise a plurality of rows, two adjacent rows of concave lens units are arranged in a staggered manner, two rows of concave lens units which are separated by one row are arranged identically, and three concave lens units which are adjacent to each other in the two adjacent rows of concave lens units respectively form three vertexes of an equilateral triangle.

Furthermore, the triangular pyramid structure is obtained by deviating a preset distance from the vertex of the regular triangular pyramid structure, and a deflection angle α is formed between a reflection surface with the smallest included angle with the bottom surface in the triangular pyramid structure obtained by deviating and a corresponding conical surface in the regular triangular pyramid structure, wherein the deflection angle α is 15-30 degrees.

Further, the ratio of the height of the bottom surface of the cone to the distance from the top of the cone to the bottom surface of the cone is 1:1.1 to 1: 1.2.

Furthermore, the distances from the point of the cone top projection of each triangular pyramid structure on the cone bottom surface to the geometric center of the cone bottom surface are all equal.

Further, the dimensional relationship between the concave lens unit and the triangular pyramid structure is as follows: r is (0.2-0.6) W; w is the height of the conical bottom surface, the unit is micrometer, R is the radius of a sphere where the concave lens units are located, the unit is micrometer, the radius R of the sphere where the concave lens units are located is 20 micrometers-100 micrometers, and the distance L between every two adjacent concave lens units is larger than R/4 and smaller than R/2.

Further, the reflective membrane still includes mask layer, air bed and supporting layer, and the mask layer setting is provided with the air bed in the one side that deviates from the prism layer of dispersing the enhancement layer between supporting layer and the prism layer, and the air bed is the air bag structure, and the air bag structure is formed by prism layer and supporting layer through hot pressing complex, and the supporting layer is hot briquetting supporting structure.

Further, the reflective membrane still includes the gum layer and leaves the type rete, and the gum layer setting deviates from the one side of air bed at the supporting layer, deviates from the one side of supporting layer at the gum layer from the type rete setting, and the contact surface coating of type rete and gum layer has silicone oil.

Furthermore, the reflecting surface with the smallest included angle with the cone bottom surface in the same triangular pyramid structure is a deflection reflecting surface, and the directions of the four deflection reflecting surfaces in the same array unit are different.

Use the technical scheme of the utility model, when light is through the concave lens unit of dispersing the enhancement layer, utilize the concave lens to the effect of dispersing of light, realize the deflection of light after contrary reflection, incident light can obtain certain light divergence angle through the concave lens unit, make the observer can receive more contrary reflection light, the prism layer comprises a plurality of array units, the array unit includes a plurality of triangular pyramid structures, deflection has taken place for a plane of reflection of triangular pyramid structure, make bigger-angle incident light can accomplish contrary reflection process of reflection, reflection film luminance has greatly been improved, thereby solved the unable intraocular problem of effectively reflecting incident light to the observer with the reflection film.

Drawings

The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention. In the drawings:

fig. 1 shows a schematic structural view of a reflective film in an embodiment of the present invention;

fig. 2 shows a schematic structural view of a concave lens unit in an embodiment of the invention;

FIG. 3 is a schematic diagram showing the arrangement of concave lens elements on a film substrate in an embodiment of the present invention;

fig. 4 shows a schematic structural view of a triangular pyramid structure in an embodiment of the invention;

fig. 5 shows a schematic structural diagram of an array unit in an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating the process of incident light entering the reflective film in an embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a divergence-enhancing layer; 11. a concave lens unit; 12. a film substrate; 20. a prism layer; 21. an array unit; 211. a triangular pyramid structure; 2111. deflecting the reflective surface; 30. a mask layer; 40. an air layer; 50. a support layer; 60. a back glue layer; 70. a release film layer; 80. incident light; 90. retroreflecting light rays; 100. the light is reflected.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings.

It is noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In order to solve the problem that the reflective membrane in the prior art can not effectively reflect incident light to the eyes of observers, the utility model provides a reflective membrane.

As shown in fig. 1 to 5, the light reflecting film includes a divergence-enhancing layer 10 and a prism layer 20. The divergence-enhancing layer 10 is close to the light incident side relative to the prism layer 20, wherein a surface of one side of the divergence-enhancing layer 10 facing or departing from the prism layer 20 is provided with a plurality of concave lens units 11, and the concave lens units 11 are arranged on the divergence-enhancing layer 10 at intervals and are arranged in an array. One side of the prism layer 20 departing from the divergence enhancing layer 10 is provided with an array unit 21, the array unit 21 is a plurality of and is arranged adjacently in sequence, each array unit 21 comprises a plurality of triangular pyramid structures 211 connected in sequence, and the point of the vertex projection of each triangular pyramid structure 211 in the same array unit 21 on the pyramid bottom surface deviates from the geometric center of the pyramid bottom surface.

To better illustrate the technical solution of the present invention, the path of light in the reflective film is first described below.

As shown in fig. 6, when the incident light 80 is irradiated to the reflective film, a total reflection process occurs on each of the three reflective surfaces of the triangular pyramid structure 211 of the prism layer 20, so as to obtain a retroreflected light 90. As retroreflective light ray 90 passes through concave lens elements 11 of divergence-enhancing layer 10, its path is directionally deflected, producing a ray divergence angle γ, resulting in reflected light ray 100. In the present embodiment, the light divergence angle γ is 0 degree to 3 degrees.

When the retro-reflection light ray 90 passes through the concave lens unit 11 of the divergence enhancement layer 10, the retro-reflection light ray 90 is deflected by utilizing the divergence effect of the concave lens on the light ray, and the retro-reflection light ray 90 passes through the concave lens unit 11 to obtain a light ray divergence angle γ, so that an observer can receive more retro-reflection light rays 90. Prism layer 20 comprises a plurality of array unit 21, and array unit 21 includes a plurality of triangular pyramid structures 211, and deflection has taken place for a reflecting surface of triangular pyramid structure 211 for retroreflection process can be accomplished to incident light 80 at bigger angle, has greatly improved reflective membrane luminance, thereby makes the reflective membrane effectively reflect incident light 80 to the observer intraocular, and the observer can effectively discern the information on the reflective membrane.

In the present embodiment, the concave lens cells 11 are disposed on a side surface facing away from the prism layer 20, that is, an upper surface of the divergence-enhancing layer 10. Of course, the concave lens cells 11 may also be provided on the surface of the side facing the prism layer 20, that is, the lower surface of the divergence-enhancing layer 10. The two setting modes have the same light deflection and divergence effect and can be selected according to actual requirements.

As shown in fig. 3, the plurality of concave lens units 11 include a plurality of rows, two adjacent rows of concave lens units 11 are arranged in a staggered manner, two rows of concave lens units 11 spaced by one row are arranged in the same manner, and three concave lens units 11 adjacent to each other in two adjacent rows of concave lens units 11 respectively form three vertexes of an equilateral triangle. The arrangement mode enables the distances between each concave lens unit 11 to be equal, and guarantees the uniformity of the light deflection and divergence effect of the concave lens units 11.

The retro-reflective light rays 90 form a certain divergence angle due to the concave lens elements 11 of the divergence-enhancing layer 10, and the light divergence also causes a decrease in light intensity to some extent. Therefore, in order to compensate the defect of the light intensity decline, the utility model discloses still improve the structure on the prism layer 20 of reflective membrane, make the incident ray 80 of more angles can participate in accomplishing contrary reflection process, improve the effective angle of incidence scope.

As shown in fig. 4, the triangular pyramid structure 211 is obtained by deviating a preset distance from the vertex of the regular triangular pyramid structure, and a deflection angle α is provided between a reflection surface having the smallest included angle with the bottom surface of the regular triangular pyramid structure 211 obtained by deviating and a corresponding conical surface in the regular triangular pyramid structure, and the deflection angle α is 15 degrees to 30 degrees. In this embodiment, the triangular pyramid structure 211 is a pyramid O 'ABC, the regular triangular pyramid structure is a pyramid OABC, the base surface of the pyramid is a plane ABC, the reflecting surface having the smallest included angle with the base surface of the pyramid is a plane O' AB, the conical surface corresponding to the plane O 'AB in the regular triangular pyramid structure is a plane OAB, and the plane O' AB has a deflection angle α with the plane OAB. The vertex of the triangular pyramid structure 211 in this embodiment is a point O ', the vertex of the regular triangular pyramid structure is a point O, and the distance between the point O' and the point O is a preset distance.

In the present embodiment, the distances from the point of the pyramid top projected on the pyramid bottom surface of each triangular pyramid structure 211 to the geometric center of the pyramid bottom surface are all equal. That is, the deflection angles α between the reflection surface having the smallest angle with the base surface of the pyramid in each triangular pyramid structure 211 and the corresponding pyramid surface in the regular triangular pyramid structure are all equal.

As shown in fig. 5, each array unit 21 includes four triangular pyramid structures 211 connected in sequence, each triangular pyramid structure 211 has three reflecting surfaces, and an included angle between one reflecting surface and a pyramid bottom surface in the same triangular pyramid structure 211 is smaller than included angles between the other two reflecting surfaces and the pyramid bottom surface respectively.

As shown in fig. 5, the reflecting surface having the smallest included angle with the cone bottom surface in the same triangular pyramid structure 211 is a deflecting reflecting surface 2111, and the directions of the four deflecting reflecting surfaces 2111 in the same array unit 21 are different. The arrangement of the deflecting and reflecting surface 2111 enables more light rays to participate in the retro-reflection process, the retro-reflection coefficient of the reflective film is increased, and the night brightness is higher. The four deflecting and reflecting surfaces 2111 in the same array unit 21 are oriented differently, so that the incident light 80 from different directions can be received to the greatest extent, and the retro-reflection process can be completed. By the improvement, the effective incidence angle range of the reflective film can reach 0-50 degrees. The brightness of the reflective film is remarkably improved, so that the problem of light intensity reduction caused by divergence is solved.

Specifically, the ratio of the height of the bottom surface of the cone to the distance from the top of the cone to the bottom surface of the cone is 1:1.1 to 1: 1.2. In FIG. 4, the base of the cone is face ABC, which is an equilateral triangle with the apex of the cone at point O'. The height of the bottom surface of the cone is equal to that of the equilateral triangle ABC, and the distance from the top of the cone to the bottom surface of the cone is the distance from the point O' to the surface ABC.

As shown in fig. 2, the divergence-enhancing layer 10 further includes a film substrate 12, and the concave lens units 11 are disposed on the surface of the film substrate 12, and the concave lens units 11 are concave hemispherical cavity structures. The concave lens unit 11 may be formed on the surface of the film base 12 by embossing, laser micro-engraving, or the like.

Specifically, the light transmittance of the film substrate 12 is greater than 85%, and the film substrate 12 is one of a PC film, a PVC film, or a PET film. In the present embodiment, the film substrate 12 is a PC film. The PC material has good light transmission and weather resistance, ensures that the reflective film can be normally used in various environments, and greatly prolongs the service life of the reflective film.

In particular, the divergence-enhancing layer 10 has a thickness of 50 to 200 microns.

In the present embodiment, the dimensional relationship between the concave lens unit 11 and the triangular pyramid structure 211 is as follows:

R＝(0.2～0.6)W；

wherein, W is the height of the bottom surface of the cone in micrometers, and R is the radius of the sphere where the concave lens unit 11 is located in micrometers.

Specifically, the radius R of the sphere on which the concave lens unit 11 is located is 20 to 100 micrometers.

As shown in FIG. 2, the pitch L of two adjacent concave lens cells 11 is greater than R/4 and less than R/2. By reasonably setting the radius R of the sphere where the concave lens unit 11 is located and the distance L between two adjacent concave lens units 11, the retro-reflective light rays 90 pass through the concave lens units 11 to generate a light ray divergence angle γ of 0 to 3 degrees, so that an observer can receive more retro-reflective light rays 90.

According to the distribution analysis of the reflected light of the triangular pyramid, the total reflection light in the triangular pyramid is mainly concentrated in the central area. The size between concave lens unit 11 and the triangular pyramid structure 211 keeps suitable matching nature, and R (0.2 ~ 0.6) W promptly for the inside total reflection light of triangular pyramid structure 211 can pass through concave lens unit 11 by a great extent, realizes the divergent angle modulation of total reflection light, simultaneously under this matching nature condition, can make array unit 21 keep complete structure, and its structural dimension is too big will be unfavorable for realizing the better effect of dispersing of light.

As shown in fig. 1, the retroreflective film further includes a mask layer 30, an air layer 40, and a support layer 50. The mask layer 30 is arranged on one side of the divergence enhancement layer 10, which is far away from the prism layer 20, an air layer 40 is arranged between the support layer 50 and the prism layer 20, the air layer 40 is of an air bag structure, the air bag structure is formed by hot-pressing and compounding the prism layer 20 and the support layer 50, and the support layer 50 is of a hot-pressing forming support structure. The mask layer 30 is made of a transparent material, and the mask layer 30 is one of a transparent PET layer, a PVC layer or a PMMA layer. The mask layer 30 is located on the outermost layer of the reflective film and is a protective layer of the reflective film. The mask layer 30 must be transparent due to the performance characteristics of the retroreflective sheeting, and thus the mask layer 30 must be made of a transparent material. In the present embodiment, the face film layer 30 is a transparent PET layer. The PET material has good light transmittance and weather resistance, ensures that the reflective film can be normally used in various environments, and greatly prolongs the service life of the reflective film. With the air bladder structure, the incident light 80 can complete the retro-reflection process at the air layer 40, so that the incident light 80 can enter the eyes of the observer. The thermo-compression molding bracket structure facilitates the formation of the air layer 40 between the prism layer 20 and the support layer 50, and has sufficient support capability.

Specifically, the prism layer 20 is one of a PC light-cured resin layer or a PMMA light-cured resin layer. In the present embodiment, the prism layer 20 is a PC light-curing resin layer. The PC light-cured resin material can be rapidly cured under illumination, has high production efficiency, and meets the manufacturing requirements of the prism layer 20. The PC light-cured resin material has good weather resistance and higher strength, and ensures the service life of the reflective film.

As shown in fig. 1, the reflective film further includes a back adhesive layer 60 and a release film layer 70. The gum layer 60 sets up the one side that deviates from air bed 40 at supporting layer 50, sets up the one side that deviates from supporting layer 50 at gum layer 60 from type coating 70, and the contact surface coating of leaving type coating 70 and gum layer 60 has silicone oil. In this embodiment, the gum layer 60 is acrylic acid pressure sensitive adhesive layer, and acrylic acid pressure sensitive adhesive layer is one kind from the adhesive layer, has that adhesion property is good, the lasting advantage of weatherability, need not heating, solvent or other means, only need apply less effort can the adhesion in smooth clear surface, has guaranteed the bonding of reflective membrane when convenient to use firmly. In the present embodiment, the release film layer 70 is a PE transparent film. The release film layer 70 is a protective layer of the backing layer 60, and prevents the backing layer 60 from being damaged and affecting the bonding effect when the reflective film is not bonded at the use position. Silicone oil is coated on the contact surface of the release film layer 70 and the back adhesive layer 60, so that the release film layer 70 is easily peeled off when the reflective film is used.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: when light is through the concave lens unit 11 of the enhancement layer 10 that diverges, utilize the divergent effect of concave lens to light, realize the deflection of light after contrary reflection, incident light 80 can obtain certain light divergence angle through concave lens unit 11, make the observer can receive more contrary reflection light 90, prism layer 20 comprises a plurality of array unit 21, array unit 21 includes a plurality of triangular pyramid structures 211, a plane of reflection of triangular pyramid structure 211 has taken place to deflect, make more wide-angle incident light 80 can accomplish contrary reflection process, reflective film luminance has greatly been improved, thereby make reflective film effectively reflect incident light 80 to the observer intraocular, the observer can effectively recognize the information on the reflective film.

It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A retroreflective film characterized by comprising a divergence-enhancing layer (10) and a prism layer (20), the divergence-enhancing layer (10) being located near the light-entry side relative to the prism layer (20), wherein,

a plurality of concave lens units (11) are arranged on the surface of one side, facing or deviating from the prism layer (20), of the divergence enhancement layer (10), and the concave lens units (11) are arranged on the divergence enhancement layer (10) at intervals and are arranged in an array;

one side of the prism layer (20) departing from the divergence enhancement layer (10) is provided with an array unit (21), the array unit (21) is a plurality of and is adjacent in sequence, each array unit (21) comprises a plurality of triangular pyramid structures (211) which are connected in sequence, and the point of the cone top projection of each triangular pyramid structure (211) in the array unit (21) on the cone bottom surface deviates from the geometric center of the cone bottom surface.

2. The reflective film according to claim 1, wherein each array unit (21) comprises four triangular pyramid structures (211) connected in sequence, each triangular pyramid structure (211) has three reflective surfaces, and an included angle between one reflective surface and the bottom surface of the pyramid in the same triangular pyramid structure (211) is smaller than an included angle between the other two reflective surfaces and the bottom surface of the pyramid respectively.

3. The reflective film according to claim 1, wherein the plurality of concave lens units (11) comprise a plurality of rows, two adjacent rows of the concave lens units (11) are arranged in a staggered manner, two rows of the concave lens units (11) spaced by one row are arranged in a same manner, and three concave lens units (11) adjacent to each other in two adjacent rows of the concave lens units (11) respectively form three vertexes of an equilateral triangle.

4. The reflective film according to claim 2, wherein the triangular pyramid structure (211) is obtained by deviating a preset distance from the vertex of a regular triangular pyramid structure, and a deflection angle α is provided between the reflective surface with the smallest included angle with the bottom surface of the pyramid in the triangular pyramid structure (211) obtained by the deviation and the corresponding conical surface in the regular triangular pyramid structure, and the deflection angle α is 15 degrees to 30 degrees.

5. The retroreflective sheeting of claim 1 wherein the ratio of the height of the conical bottom surface to the distance from the apex of the cone to the conical bottom surface is from about 1:1.1 to about 1: 1.2.

6. The sheeting of claim 1, wherein the points of the triangular pyramid structures (211) projected on the pyramid base surface from the vertex to the geometric center of the pyramid base surface are all equidistant.

7. The sheeting of claim 1 wherein the dimensional relationship between the concave lens cells (11) and the triangular pyramid structures (211) is:

R＝(0.2～0.6)W；

w is the height of the conical bottom surface and is in a unit of micrometer, R is the radius of a sphere where the concave lens units (11) are located and is in a unit of micrometer, the radius R of the sphere where the concave lens units (11) are located is 20 micrometers to 100 micrometers, and the distance L between every two adjacent concave lens units (11) is larger than R/4 and smaller than R/2.

8. The retroreflective sheeting of any one of claims 1-7, further comprising a mask layer (30), an air layer (40), and a support layer (50), wherein the mask layer (30) is disposed on a side of the divergence-enhancing layer (10) facing away from the prism layer (20), the air layer (40) is disposed between the support layer (50) and the prism layer (20), the air layer (40) is an air bladder structure formed by hot-press compounding the prism layer (20) and the support layer (50), and the support layer (50) is a hot-press molded scaffold structure.

9. The retroreflective sheeting according to claim 8, further comprising a backing layer (60) and a release film layer (70), wherein the backing layer (60) is disposed on a side of the support layer (50) facing away from the air layer (40), the release film layer (70) is disposed on a side of the backing layer (60) facing away from the support layer (50), and a contact surface of the release film layer (70) with the backing layer (60) is coated with silicone oil.

10. The light-reflecting film according to claim 2, wherein the reflecting surface having the smallest included angle with the bottom surface of the pyramid in the same triangular pyramid structure (211) is a deflecting reflecting surface (2111), and the four deflecting reflecting surfaces (2111) in the same array unit (21) are oriented in different directions.

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