Optical anti-counterfeiting element and manufacturing method therefor, and anti-counterfeiting product

1 . An optical anti-counterfeiting element, wherein the optical anti-counterfeiting element comprises:

a micro lens array layer, having a micro lens array; and

a micro graphic-text array layer;

the micro graphic-text array layer comprises a micro graphic-text area and a micro graphic-text background area;

a surface undulation shape of the micro graphic-text area and a surface undulation shape of the micro graphic-text background area are different, and a height of the micro graphic-text area and a height of the micro graphic-text background area are different; or

the surface undulation shape of the micro graphic-text area and the surface undulation shape of the micro graphic-text background area are different; or

the height of the micro graphic-text area and the height of the micro graphic-text background area are different; and

observing from one side of the micro lens array layer, the micro lens array samples and synthesizes the micro graphic-text array layer, so as to form a graphic-text area and a graphic-text background area with different visual features; and

a coated optically variable film located on the micro graphic-text array layer, the coated optically variable film comprises an absorption layer, a dielectric layer and a reflecting layer, which are stacked from a surface of the micro graphic-text array layer in sequence, and the dielectric layer is formed by a wet coating process.

2 . The optical anti-counterfeiting element according to claim 1 , wherein the different visual features refer to that:

one of the graphic-text area and the graphic-text background area has a color change feature depending on an observation angle, and the other does not have the color change feature depending on the observation angle; or

the graphic-text area and the graphic-text background area have different color change features depending on the observation angle.

3 . The optical anti-counterfeiting element according to claim 2 , wherein cross sections of the surface undulation shape of the micro graphic-text area and the surface undulation shape of the micro graphic-text background area are at least one of a flat structure, a rectangle, a zigzag shape and a sinusoidal shape.

4 . The optical anti-counterfeiting element according to claim 3 , wherein at least one of the surface undulation shape of the micro graphic-text area and the surface undulation shape of the micro graphic-text background area is the flat structure.

5 . The optical anti-counterfeiting element according to claim 1 , wherein a height difference between the micro graphic-text area and the micro graphic-text background area ranges from 50 nm to 600 nm.

6 . The optical anti-counterfeiting element according to claim 1 , wherein a period of at least one of the micro lens array and the micro graphic-text array ranges from 10 μm to 100 μm.

7 . The optical anti-counterfeiting element according to claim 6 , wherein a focal length of the micro lens array ranges from 5 μm to 100 μm.

8 . The optical anti-counterfeiting element according to claim 1 , wherein a minimum value of a line size of the micro graphic-text array is less than 15 μm.

9 . The optical anti-counterfeiting element according to claim 1 , wherein undulation shapes of two side faces of the dielectric layer are different.

10 . The optical anti-counterfeiting element according to claim 1 , wherein the micro lens array layer and the micro graphic-text array layer are made of the same material.

11 . The optical anti-counterfeiting element according to claim 1 , wherein the optical anti-counterfeiting element further comprises:

a substrate, comprising a first surface and a second surface;

the micro lens array layer at least partially covers the first surface, and the micro graphic-text array layer at least partially covers the second surface.

12 . The optical anti-counterfeiting element according to claim 1 , wherein the optical anti-counterfeiting element further comprises:

a functional coating, which is located on the coated optically variable film, and is configured to achieve a bonding function and/or a protection function.

13 . An anti-counterfeiting product, comprising the optical anti-counterfeiting element according to claim 1 .

14 . The anti-counterfeiting product according to claim 13 , wherein the anti-counterfeiting product comprises one of the following:

a logo, a hot stamping wide strip, a sticker and a security strip.

15 . A manufacturing method of an optical anti-counterfeiting element according to claim 1 , comprising:

forming a multi-layer body comprising a micro lens array layer and a micro graphic-text array layer, a surface undulation shape of a micro graphic-text area of the micro graphic-text array layer and a surface undulation shape of a micro graphic-text background area of the micro graphic-text array layer are different; and/or

a height of the micro graphic-text area and a height of the micro graphic-text background area are different; and

forming an absorption layer on the micro graphic-text array layer, forming a dielectric layer on the absorption layer by a wet coating process, and forming a reflecting layer on the dielectric layer.

16 . The manufacturing method of an optical anti-counterfeiting element according to claim 15 , wherein the manufacturing method further comprises:

after the dielectric layer forms a film by the wet coating process, the dielectric layer is hot pressed on a flat metal plate.