CN110824589A

CN110824589A - Optical film, electronic equipment cover plate and mold

Info

Publication number: CN110824589A
Application number: CN201810899882.8A
Authority: CN
Inventors: 亢红伟; 洪莘; 张晟; 申溯
Original assignee: Shine Optoelectronics Kunshan Co Ltd
Current assignee: Shine Optoelectronics Kunshan Co Ltd
Priority date: 2018-08-09
Filing date: 2018-08-09
Publication date: 2020-02-21
Anticipated expiration: 2038-08-09
Also published as: CN110824589B

Abstract

The invention discloses an optical film, which comprises a curing adhesive layer, wherein the curing adhesive layer comprises a plurality of micro-nano structures formed by imprinting; the micro-nano structure is convex and/or concave and is conical, the conical micro-nano structure comprises at least 3 curved side walls, and the at least 3 curved side walls are smoothly connected. The optical film can present toper shadow, and the conical micro-nano structure does not have sharp-pointed angle or limit for the toper shadow that optical film formed is obvious and soft, and visual effect is more outstanding, and the degree of discernment is high. In addition, the invention also discloses an electronic equipment cover plate with the optical film and a mould for preparing the optical film.

Description

Optical film, electronic equipment cover plate and mold

Technical Field

The invention particularly relates to an optical film, an electronic equipment cover plate and a mold, and belongs to the field of optics.

Background

In recent years, with the continuous development of electronic technology, electronic devices are more and more commonly used, and besides the most basic communication function, functions of multimedia playing, radio reception, web browsing, photographing and the like are added. Meanwhile, the requirements of users on the appearance of electronic equipment are higher and higher, and the electronic equipment gradually develops towards the design direction of beautiful appearance. The appearance design of the electronic equipment is mainly the design of the cover plate of the electronic equipment.

The existing electronic equipment cover plate is monotonous in appearance, lack of novelty and free of excessive decoration, is generally in a single color, is difficult to meet higher requirements of users on aspects such as appearance aesthetic feeling and artistic feeling of electronic equipment, and is poor in aesthetic degree.

Therefore, it is highly desirable to provide an optical film with decorative effect, which has bright color, variable appearance and rich visual effect.

Disclosure of Invention

It is a primary object of the present invention to provide an optical film that overcomes the deficiencies of the prior art.

The invention also aims to provide an electronic equipment cover plate with the decorative film.

Another object of the present invention is to provide a mold for manufacturing an optical film.

In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:

an optical film comprises a curing adhesive layer, wherein the curing adhesive layer comprises a plurality of micro-nano structures; the micro-nano structure is convex and/or concave and is conical, the conical micro-nano structure comprises at least 3 curved side walls, and the at least 3 curved side walls are smoothly connected.

In some embodiments, the micro-nano structure is formed on the solidified glue layer by stamping.

In some embodiments, the micro-nano structure has a globoid top formed by the intersection of the at least 3 curved sidewalls.

In some embodiments, the cured adhesive layer includes a first side surface and a second side surface which are opposite to each other, the micro-nano structure protrudes or recesses from the first side surface, a cone bottom is formed at a joint of the micro-nano structure and the first side surface, and the cone bottom is polygonal.

In some embodiments, the cone base is an isosceles triangle, a rectangle, or a regular hexagon.

In some embodiments, the micro-nano structures define a width d, a height or a depth h, and a distance between two adjacent micro-nano structures is w, so that d is greater than or equal to 10 μm and less than or equal to 200 μm, h is greater than or equal to 1 μm and less than or equal to 200 μm, and w is greater than 0 and less than or equal to 50 μm.

In some embodiments, the micro-nano structures are arranged regularly, distributed randomly or arranged in a gradual change mode, and the duty ratio of the micro-nano structures is greater than 80%.

In some embodiments, the cured bondline is a colored bondline.

In some embodiments, the micro-nano structure further comprises a substrate layer, a reflecting layer and a coloring layer, wherein the reflecting layer is arranged on the micro-nano structure in a covering mode, the coloring layer is arranged on the reflecting layer in a covering mode, and the substrate layer is arranged on the other side, opposite to the micro-nano structure, of the curing glue layer.

The invention also discloses an electronic equipment cover plate which comprises the optical film.

The invention also discloses a mold for preparing the optical film, which comprises a bearing layer, wherein the bearing layer comprises a plurality of microstructures in concave and/or convex arrangement, the microstructures are in a conical shape, the conical microstructures comprise at least 3 curved side walls, and the at least 3 curved side walls are smoothly connected.

Compared with the prior art, the optical film can present the toper shadow, and the conical micro-nano structure does not have sharp-pointed angle or limit for the toper shadow that optical film formed is obvious and soft, and visual effect is outstanding more, and the degree of discernment is high.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic plan view of an optical film of the present invention;

FIG. 2 is a schematic cross-sectional view of an optical film of the present invention;

FIG. 3 is an enlarged schematic view of a micro-nano structure of the optical film of the present invention;

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a bottom view of FIG. 3;

FIG. 6 is an enlarged schematic view of another micro-nano structure of the optical film of the present invention;

FIG. 7 is a top view of FIG. 6;

FIG. 8 is a bottom view of FIG. 6;

FIG. 9 is another schematic cross-sectional view of an optical film of the present invention.

Detailed Description

In view of the deficiencies in the prior art, the inventors of the present invention have made extensive studies and extensive practices to provide technical solutions of the present invention. The technical solution, its implementation and principles, etc. will be further explained as follows.

It is to be noted that the definitions of the terms mentioned in the description of the present invention are known to those skilled in the art. Also, 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. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The invention discloses an optical film which comprises a cured adhesive layer, wherein the cured adhesive layer comprises a plurality of micro-nano structures (preferably formed by stamping). The micro-nano structure is arranged in a convex or concave mode and is conical, the conical micro-nano structure comprises at least 3 curved side walls, and the at least 3 curved side walls are connected smoothly. The optical film can present toper shadow, and the conical micro-nano structure does not have sharp-pointed angle or limit for the toper shadow that optical film formed is obvious and soft, and visual effect is more outstanding, and the degree of discernment is high.

Preferably, the micro-nano structure is provided with a spherical arc surface conical top, and the spherical arc surface conical top is formed by at least 3 curved side walls in an intersection mode. I.e. the conical micro-nano structure does not have a sharp top.

Preferably, the solidified glue layer comprises a first side surface and a second side surface which are opposite, the micro-nano structure protrudes or is sunken from the first side surface, a cone bottom is formed at the joint of the micro-nano structure and the first side surface, and the cone bottom is polygonal. For example, the cone base is an isosceles triangle, a rectangle or a regular hexagon. Taking a square as an example, the micro-nano structure is provided with 4 curved side walls, the curved side walls are connected with the curved side walls in a smooth mode, namely arc connection, the 4 curved side walls are intersected at the cone top, and the cone top collapses to be similar to a spherical arc surface.

Preferably, the micro-nano structure is defined to have a width d, a height or depth h, and the distance between two adjacent micro-nano structures is w, so that d is larger than or equal to 10 μm and smaller than or equal to 200 μm, h is larger than or equal to 1 μm and smaller than or equal to 200 μm, and w is larger than 0 and smaller than or equal to 50 μm. For example, d of the micro-nano structure is 10 μm, 50 μm, 120 μm; h is 1 μm, 20 μm, 160 μm; w is 10 μm, 30 μm, etc.

Preferably, the plurality of micro-nano structures are regularly arranged, randomly distributed or gradually changed. For example, the micro-nano structure is in an array arrangement with a square conical bottom, or the micro-nano structure gradually becomes smaller in d in one arrangement direction. The duty ratio refers to the surface area occupied by the micro-nano structure on the first side face, and the duty ratio of the micro-nano structure is set to be larger than 80%.

Preferably, the cured glue layer is a coloured glue layer. The color carried by the cured bondline itself may provide color to the optical film.

Preferably, the optical film further includes a base material layer, a reflective layer, and a colored layer. The reflecting layer is covered on the micro-nano structure, the coloring layer is covered on the reflecting layer, and the base material layer is arranged on the other side of the curing glue layer relative to the micro-nano structure. The reflecting layer is used for enhancing the optical effect, so that the optical effect is clearer and more obvious, and the reflecting layer can provide color for the optical film independently or together with the coloring layer. The pigmented layer is used for priming, such as with a photoblack ink, to separate the outer and inner structures when the optical film is used in an electronic device cover. The substrate layer is used for carrying a cured glue layer, preferably, such as PET, PC, PE, PMMA, etc., and preferably, the substrate layer is a colored layer, for example, a colored PET layer.

The invention also discloses an electronic equipment cover plate which comprises the optical film. The electronic equipment cover plate comprises a shell and an optical film bonded on the shell. The shell is made of transparent glass, transparent organic glass or transparent composite board and the like. For example, the shell is a composite plate of PC and PMMA.

The invention also discloses a mold for preparing the optical film, which comprises the bearing layer. The bearing layer comprises a plurality of microstructures which are arranged in a protruding and/or sunken mode. The microstructure is in a conical shape, the conical microstructure comprises at least 3 curved side walls, and the at least 3 curved side walls are smoothly connected. And (3) impressing the uncured cured adhesive layer by using the mold, transferring the microstructure of the mold to the uncured adhesive layer, and curing and demolding to form the micro-nano structure. The curing glue layer can be UV curing glue or thermosetting glue. The conical micro-nano structure is formed by stamping and fixing the mould, the process is simple, and the yield is high.

The technical scheme of the optical film of the invention is further described in detail by a plurality of embodiments and the accompanying drawings. However, the examples are chosen only for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.

Referring to fig. 1 to 5, an optical film 1 of the present invention includes a cured adhesive layer 10. The solidified glue layer 10 comprises a plurality of micro-nano structures 11 formed by stamping. The micro-nano structure 11 is arranged in a protruding mode and is conical. The conical micro-nano structure 11 comprises 4 curved side walls 111, and the 4 curved side walls 111 are smoothly connected. The optical film can present toper shadow, and the conical micro-nano structure does not have sharp-pointed angle or limit for the toper shadow that optical film formed is obvious and soft, and visual effect is more outstanding, and the degree of discernment is high.

The micro-nano structure 11 is provided with a spherical cambered surface conical top 112, and the spherical cambered surface conical top 112 is formed by the intersection of 4 curved side walls 111. The conical micro-nano structure 11 does not have a sharp top, so that sharp bright spots are avoided.

The cured bondline 10 includes opposing first and

second sides

101 and 102. The micro-nano structure 11 protrudes from the first side surface 101, a conical bottom 113 is formed at the joint of the micro-nano structure 11 and the first side surface 101, and the conical bottom 113 is square. The micro-nano structure 11 has a width d and a height h, and d is 30 μm and h is 5 μm. The optical film 1 has a regular array arrangement of a plurality of micro-nano structures 11 (as shown in fig. 1), the plurality of micro-nano structures 11 are arranged at intervals, a distance between two adjacent micro-nano structures 11 is defined as d, and d is 15 μm.

Referring to fig. 2, the optical film 1 may further include a substrate layer (e.g., a PET layer) carrying the cured adhesive layer 10, a reflective layer and a colored layer. The reflecting layer is covered on the micro-nano structure 11, and the coloring layer is covered on the reflecting layer. The cured adhesive layer 10 is colored by itself, for example, red. The reflecting layer makes the optical effect more obvious and the red color more beautiful. The coloring layer is a bright black ink layer.

Referring to fig. 3, 4 and 5, an enlarged schematic view of a single micro-nano structure 11 is shown. Fig. 4 is a plan view, and fig. 5 is a bottom view. Due to the arrangement of the curved sidewall 111 and the globoidal cone top 112, there is no clear line of demarcation, and the top view appears as shown in fig. 4.

Referring to fig. 6 to 8, another optical film 2 of the present invention is shown. The optical film 2 is different from the optical film 1 in that a conical bottom 213 of the micro-nano structure 21 of the optical film 2 is an isosceles triangle, and the conical micro-nano structure 21 has three curved side walls 211 which are smoothly connected. The width of the micro-nano structure 21, namely the side length d is 45 μm, and h is 6 μm, the optical film 2 has a triangular cone-shaped light shadow effect, and the light shadow effect is obvious and soft, and has a good decoration effect.

Referring to fig. 9, another optical film 3 of the present invention is shown. The optical film 3 is different from the optical film 1 in that the micro-nano structure 31 of the optical film 3 is recessed in the first side 301 of the cured adhesive layer 30.

The optical film forms a conical light and shadow effect, the optical effect is soft, the color is more gorgeous and changeable and is full in inspiration, so that a rich visual effect is formed, a good decorative effect and attractive degree are achieved, the identification degree is higher, and the optical film has more market value.

It should be understood that the above describes only some embodiments of the present invention and that various other changes and modifications may be affected therein by one of ordinary skill in the related art without departing from the scope or spirit of the invention.

Claims

1. The optical film is characterized by comprising a curing adhesive layer, wherein the curing adhesive layer comprises a plurality of micro-nano structures; the micro-nano structure is convex and/or concave and is conical, the conical micro-nano structure comprises at least 3 curved side walls, and the at least 3 curved side walls are smoothly connected.

2. An optical film as recited in claim 1, wherein the micro-nano structure has an globoidal cone apex formed by the intersection of the at least 3 curved sidewalls.

3. The optical film according to claim 1, wherein the cured adhesive layer comprises a first side surface and a second side surface which are opposite, the micro-nano structure protrudes or recesses from the first side surface, a cone bottom is formed at the joint of the micro-nano structure and the first side surface, and the cone bottom is polygonal.

4. An optical film as recited in claim 3, wherein the cone bases are isosceles triangles, rectangles or regular hexagons.

5. An optical film according to claim 1 or 4, wherein the micro-nano structures define a width d, a height or a depth h, and a distance between two adjacent micro-nano structures is w, so that d is 10 μm or more and 200 μm or less, h is 1 μm or more and 200 μm or less, and w is more than 0 and less than or equal to 50 μm.

6. The optical film according to claim 1, wherein the micro-nano structures are arranged regularly, randomly or gradually, and the duty ratio of the micro-nano structures is greater than 80%.

7. An optical film as recited in claim 1, wherein the cured adhesive layer is a colored adhesive layer.

8. An optical film according to claim 1, further comprising a substrate layer, a reflective layer and a coloring layer, wherein the reflective layer is disposed on the micro-nano structure, the coloring layer is disposed on the reflective layer, and the substrate layer is disposed on the other side of the cured glue layer relative to the micro-nano structure.

9. An electronic device cover, characterized in that it comprises an optical film according to any one of claims 1 to 8.

10. The mold for preparing the optical film is characterized by comprising a bearing layer, wherein the bearing layer comprises a plurality of microstructures in concave and/or convex arrangement, the microstructures are in a conical shape, each conical microstructure comprises at least 3 curved side walls, and the at least 3 curved side walls are smoothly connected.