Optical film, frosted offset plate and preparation method thereof

Abstract

The optical film, frosted offset plate and its preparation method involved in the present invention include: S1. Using graphic processing software to obtain a random pattern with a number of pixel points through random dot combination, and the pixel points are square dots; S2. Adding a number of single-point templates and replacing the pixel points with the single-point templates to obtain a frosted effect pattern; S3. According to the frosted effect pattern, performing photolithography on the offset plate to obtain a frosted offset plate with a frosted effect. The shape of the random dots of the frosted effect pattern is more diversified and at the same time reduces the design difficulty; the random dots after photolithography are independent of each other, the frosted effect is relatively delicate and there is no granularity; the offset plate has a smooth groove type with a convex structure or a concave structure; and the preparation method is simple in operation and can obtain different frosted effects such as frosted transparency, layering and fading out.

Description

Technical Field

[0001] The present invention relates to an optical film, a frosted offset plate and a preparation method thereof. Background Art

[0002] In recent years, in order to enrich the decorative effect of products, the surfaces of more and more products have a frosted effect. At present, products mainly use sandblasting to achieve the uneven effect and obtain the frosted effect. This method is limited by the fineness of the sandblasting process, and it is difficult to control the smooth gradient of the frosted effect from fog to transparency, and it is impossible to accurately control the haze of the frosted area to achieve a combination of different haze levels in specific areas. Moreover, the existing method uses graphic processing software to obtain a random pattern with a number of pixel points through random point combination, and based on this, a frosted effect is obtained through photolithography. However, the pixel points of the random pattern are square points, and the pixel points in adjacent positions will be connected to form a relatively large area. Since the pixel points are randomly formed, it is impossible to avoid the connection between pixel points. The frosted effect prepared according to this random pattern will have irregular blocks and a rough visual sense of large particles, and it is impossible to ensure the fineness of the frosted effect. Summary of the Invention

[0003] The purpose of the present invention is to provide a preparation method of a frosted offset plate, which is simple to operate, the obtained frosted offset plate has a relatively delicate frosted effect, no particle feeling, and can obtain different frosted transparency, layering and fading and other frosted effects.

[0004] To achieve the above purpose, the present invention provides the following technical solution: A preparation method of a frosted offset plate, the preparation method includes:

[0005] S1. Using graphic processing software to obtain a random pattern with a number of pixel points through random point combination, the pixel points are square points;

[0006] S2. Adding a number of single-point templates, and replacing the pixel points with the single-point templates to obtain a frosted effect pattern;

[0007] S3. According to the frosted effect pattern, performing photolithography on the offset plate to obtain a frosted offset plate with a frosted effect.

[0008] Further, the preparation method further includes: after step S3, heating and baking the offset plate, so that the offset plate has a convex structure or a concave structure.

[0009] Further, the size of the convex structure or the concave structure is 4um - 70um.

[0010] Further, when the single-point template replaces the pixel point, the center point of the single-point template corresponds to the center point of the pixel point.

[0011] Further, the random pattern has at least one color, and the color of the pixel points is set according to the frosted effect pattern.

[0012] Further, there is at least one type of single-point template, and each type of single-point template replaces the pixel points of one color.

[0013] Further, the shape inside the single-point template is a circle, a square, a triangle, a polygon or an irregular shape.

[0014] Further, the sides of the shape inside the single-point template do not intersect with the outer frame sides of the single-point template.

[0015] The present invention also provides a frosted offset plate, which is obtained by the preparation method of the frosted offset plate.

[0016] The present invention also provides an optical film, which includes a base layer, and the above-mentioned frosted effect is provided on or inside the base layer.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. Since in the present invention, a plurality of single-point templates are used to replace the pixel points in the random pattern to obtain a frosted effect pattern, and the pixel points of different colors in the random pattern correspond to different single-point templates, the shapes of the random points in the frosted effect pattern are more diversified and the design difficulty is reduced.

[0019] 2. The sides of the shape inside the single-point template do not intersect with the outer frame sides of the single-point template, so that the random points after lithography are independent of each other, and the frosted effect is relatively delicate without a granular feeling.

[0020] 3. By heating and baking the offset plate after lithography, the grooves in the offset plate become smoother.

[0021] 4. The preparation method of the frosted offset plate shown in the present invention is simple in operation, and frosted effects such as different frosted transparency, layering and fading can be obtained.

[0022] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present invention and combines with the attached drawings to describe in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of a random pattern obtained by the graphic processing software in the present invention;

[0024] Figure 2 is Figure 1 a partial enlarged view of the random pattern in

[0025] Figure 3 For single-point template replacement Figure 1 Schematic diagram of the structure of the frosted effect pattern obtained from the pixel points in the random pattern;

[0026] Figure 4 Schematic diagram of the structure of the frosted effect pattern with single-point templates of various sizes;

[0027] Figure 5 Schematic diagram of the structure of the frosted effect pattern with single-point templates of three shapes. Specific implementation manners

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] The preparation method of the frosted offset plate shown in the present invention includes:

[0031] S1. Using graphic processing software to obtain a random pattern with a number of pixel points through random point combination, and the pixel points are square points;

[0032] S2. Adding a number of single-point templates and replacing the pixel points with the single-point templates to obtain a frosted effect pattern;

[0033] S3. According to the frosted effect pattern, performing photolithography on the offset plate to obtain a frosted offset plate with a frosted effect.

[0034] Please refer to Figure 1 and Figure 2 , the pixel points of the random pattern obtained by the graphic processing software are square points, and the outer frames of adjacent pixel points will contact each other so that the pixel points are connected to form a larger area. Since the pixel points are randomly formed, it is inevitable that the pixel points are connected to each other. According to the frosted effect prepared from this random pattern, irregular blocks will appear, with a rough visual sense of large particles, and the fineness of the frosted effect cannot be guaranteed.

[0035] Please refer to Figure 3, wherein the edges of the shape within the single-point template do not intersect the outer frame edge of the single-point template, and when the single-point template replaces a pixel point, the center point of the single-point template corresponds to the center point of the pixel point. Thus, when the pixel points at adjacent positions in the random pattern are replaced by the single-point template, since the edges of the shape within the single-point template do not intersect the outer frame edge of the single-point template and the single-point template corresponds to the center of the pixel point to be replaced, the single-point templates at adjacent positions will not be connected to form a region, and the random points formed by the single-point templates are independent of each other. Therefore, it is avoided that the random points with a frosted effect after lithography are connected into a block surface, resulting in a rough visual sense of large particles, making the frosted effect more delicate and without a granular feeling. It should be noted that the shape of the outer frame of the single-point template is the same as the shape and size of the pixel point. When the single-point template replaces a pixel point, the outer frame of the single-point template coincides with the pixel point.

[0036] Among them, the random pattern has at least one color, and the color setting of the pixel point is obtained according to the frosted effect pattern. The setting of the color can be selected according to actual needs, but it is not limited to this. Different pixel points can also be displayed using different grayscales. And specifically how many colors the random pattern has is not specifically limited here and is set according to actual needs. When the single-point template replaces a pixel point, there is at least one type of single-point template, and each type of single-point template replaces the pixel points of one color or the pixel points of one grayscale. The pixel points of different colors in the random pattern correspond to different single-point templates, making the shapes of the random points of the frosted effect pattern more diverse and reducing the design difficulty at the same time.

[0037] The shape within the single-point template is a circle, a square, a triangle, a polygon, or an irregular shape, but it is not limited to this. The shape within the single-point template can also be other shapes, which are not listed one by one here. The shape within the single-point template refers to the shape formed by the single-point template parallel to the plane where the random pattern is located. The size of the single-point template refers to the size of the shape within the single-point template, and the size of the single-point template is smaller than the size of its outer frame.

[0038] The preparation method further includes: after step S3, heating and baking the printing plate, so that there are smooth grooves with convex structures or concave structures in the printing plate. The size of the convex structure or the concave structure is 4um - 70um. The specific structure and the size of the single-point template are set according to actual needs and are not specifically limited here. Even if the single-point templates have the same shape, but if the sizes within the single-point templates are different, they are different types of single-point templates. The heating conditions and methods for the printing plate are prior art and will not be elaborated here.

[0039] According to the frosted effect pattern, obtaining the frosted effect is not limited to lithography and can also be other methods, such as printing, etc., which are not listed one by one here.

[0040] It should be noted that the arrangement density of pixel points in the random pattern obtained by the graphic and text processing software is randomly arranged, and the pixel points can be arranged in a certain area of the random pattern to form the required pattern. Through the randomly arranged pixel points, the optical film presents a frosted effect; by setting the arrangement density of the pixel points, the haze of the frosting can be controlled; by setting the arrangement pattern of the pixel points, a frosted effect is presented in a certain pattern area and other areas are not frosted; by setting the arrangement density and arrangement pattern of the pixel points, the haze of frosting in different pattern areas is different, such as a frosted effect with a gradual change in haze. In the present invention, a single-point template replaces the pixel points of the random pattern, avoiding the appearance of a rough visual sense of large particles, thereby obtaining a delicate and particle-free frosted effect. Thus, the method shown in the present invention can prepare a frosted effect with a high degree of fineness, easily control the smooth transition of the frosted effect from fog to transparency, accurately control the haze of the frosted area, and achieve a combination of different haze levels in specific areas, etc.

[0041] The present invention also provides a frosted printing plate, which is obtained by the above-mentioned method for preparing a frosted printing plate. According to this frosted printing plate, the substrate can be made to have a corresponding frosted effect by lithography on the substrate by a lithography machine. The substrate can be a resin material such as PET, PVC, PC or PMMA, or a photo-curable adhesive or thermo-curable adhesive such as UV glue or OCA, or the surface of a product that requires a frosted effect. In order to batch-transfer the designed frosted effect onto the surface of the required product, the present invention can prepare a corresponding mold according to the frosted printing plate, and prepare a product with a frosted effect by mold imprinting. The product can be a mobile phone backplane, a tablet computer backplane, etc., or other products that require a frosted effect, which will not be listed one by one here.

[0042] In addition, the frosted printing plate can also be used to prepare a graphic structure with a frosted effect, which can not only retain the required graphic structure, but also increase the frosted effect, expanding the scope of use of the frosted printing plate.

[0043] The present invention also provides an optical film, which includes a base layer, and has the above-mentioned frosted effect on or inside the base layer, thereby improving the aesthetic feeling and touch of the optical film. The optical film can be applied to the cover body of electronic products to enrich the decoration of electronic products.

[0044] Hereinafter, the present invention will be further described in detail with specific embodiments.

[0045] Example 1

[0046] Please refer to Figure 3, in this embodiment, the pixel points in the random pattern have only one color. The circular single-point template is used to replace the pixel points, and a circular single-point template with a uniform size is obtained. Since the size of the circular single-point template is smaller than that of the pixel points, all the circular single-point templates will not be connected, avoiding the appearance of a rough visual sense of large particles.

[0047] The frosted effect pattern is cut, and according to the frosted effect pattern, a stitching direct writing lithography is performed on the rubber plate by using a lithography machine, obtaining a frosted effect formed by random circular lenses. The circular lenses are independent of each other and not connected, and the formed frosted effect is relatively delicate and has no graininess.

[0048] It should be noted that by adjusting the size of the circular single-point template, a frosted effect with different frosted transparency can be obtained.

[0049] Embodiment Two

[0050] Please refer to Figure 4 , in this embodiment, the pixel points in the random pattern have multiple colors. Circular single-point templates of multiple sizes are used to replace the pixel points, and a circular single-point template of one size replaces the pixel points of one color, obtaining randomly combined circular single-point templates of different sizes. Since the edges of the shapes inside the circular single-point templates do not intersect with their outer frame edges, all the circular single-point templates will not be connected, avoiding the appearance of a rough visual sense of large particles.

[0051] The frosted effect pattern is cut, and according to the frosted effect pattern, a stitching direct writing lithography is performed on the rubber plate by using a lithography machine, obtaining a frosted effect formed by randomly different-sized circular lenses. The circular lenses are independent of each other and not connected, and the formed frosted effect is relatively delicate and has no graininess. Moreover, circular single-point templates of multiple different sizes form circular lenses of multiple different sizes, which can present a hierarchical frosted effect.

[0052] Embodiment Three

[0053] Please refer to Figure 5 , in this embodiment, the pixel points in the random pattern have three colors. Three different-shaped single-point templates are used to replace the pixel points. The shapes of the three single-point templates are circular, triangular, and pentagonal respectively, and a single-point template of one shape replaces the pixel points of one color, obtaining randomly combined single-point templates of different shapes. Since the shapes inside the three single-point templates are all smaller than their outer frame edges, all the single-point templates will not be connected, avoiding the appearance of a rough visual sense of large particles.

[0054] Cut the frosted effect pattern, and use a lithography machine to splice and directly write lithography on the rubber plate according to the frosted effect pattern, obtaining a frosted effect formed by lenses with random different shapes. The circular lenses are independent of each other and not connected, and the formed frosted effect is relatively delicate without a granular feeling. Moreover, three different single-point templates form lenses with three different shapes, and the gradient arrangement of lenses with different shapes can present a fading frosted effect.

[0055] In summary, 1. Since several single-point templates are used to replace the pixel points in the random pattern to obtain the frosted effect pattern in the present invention, and the pixel points of different colors in the random pattern correspond to different single-point templates, the shapes of the random points in the frosted effect pattern are more diversified and the design difficulty is reduced.

[0056] 2. The edges of the shapes within the single-point template do not intersect with the outer frame edge of the single-point template, making the random points after lithography independent of each other, and the frosted effect is relatively delicate without a granular feeling.

[0057] 3. By heating and baking the rubber plate after lithography, the grooves in the rubber plate become smoother.

[0058] 4. The preparation method of the frosted rubber plate shown in the present invention is simple in operation, and frosted effects with different frosted transparency, layering and fading can be obtained.

[0059] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0060] The above-described embodiments only represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A preparation method of a frosted offset plate, characterized in that, the preparation method includes: S1. Obtaining a random pattern with a number of pixel points by combining random points using graphic processing software; S2. Adding a number of single-point templates, and replacing the pixel points with the single-point templates to obtain a frosted effect pattern; S3. According to the frosted effect pattern, performing photolithography on the offset plate to obtain a frosted offset plate with a frosted effect; wherein, the edges of the shape inside the single-point template do not intersect with the outer frame edge of the single-point template, and the shape of the outer frame of the single-point template is the same as the shape and size of the pixel point. When the single-point template replaces the pixel point, the outer frame of the single-point template coincides with the pixel point, and the center point of the single-point template corresponds to the center point of the pixel point.

2. The preparation method of the frosted offset plate according to claim 1, characterized in that, the preparation method further includes: after step S3, heating and baking the offset plate, so that the offset plate has a convex structure or a concave structure.

3. The preparation method of the frosted offset plate according to claim 2, characterized in that, the size of the convex structure or the concave structure is 4μm - 70μm.

4. The preparation method of the frosted offset plate according to claim 1, characterized in that, when the single-point template replaces the pixel point, the center point of the single-point template corresponds to the center point of the pixel point.

5. The preparation method of the frosted offset plate according to claim 1, characterized in that, the random pattern has at least one color, and the color of the pixel point is set according to the frosted effect pattern.

6. The preparation method of the frosted offset plate according to claim 5, characterized in that, there is at least one kind of single-point template, and each kind of single-point template replaces the pixel points of one color.

7. The preparation method of the frosted offset plate according to claim 1, characterized in that, the shape inside the single-point template is a circle, a polygon or an irregular shape.

8. The preparation method of the frosted offset plate according to claim 1, characterized in that, the edges of the shape inside the single-point template do not intersect with the outer frame edge of the single-point template.

9. A frosted offset plate, characterized in that the frosted effect is obtained by the preparation method of the frosted offset plate according to any one of claims 1 to 8.

10. An optical film, characterized in that the optical film includes a base layer, and the base layer has the frosted effect described in claim 1 on or inside it.

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