Optical anti-counterfeiting element and manufacturing method therefor

A manufacturing method of an optical anti-counterfeiting element, comprising:

• S1), forming an undulating structure layer, wherein the undulating structure layer comprises a first area, a second area and a third area, the first area has a first microstructure, the second area has a second microstructure, a specific volume of the second microstructure is greater than a specific volume of the first microstructure, and the third area is an unstructured flat area;
• S2), sequentially forming a reflecting layer, a dielectric layer and an absorbing layer on the undulating structure layer, wherein the reflecting layer is formed through vapor deposition, the dielectric layer is formed through printing, and the absorbing layer is formed through vapor deposition;
• and
• S3), putting the semi-finished product in S2) in a corrosive atmosphere capable of reacting with a material of the reflecting layer until the reflecting layer of the second area is completely or partially removed.

A manufacturing method of an optical anti-counterfeiting element, comprising:

• S1), forming an undulating structure layer, wherein the undulating structure layer comprises a first area, a second area and a third area, the first area has a first microstructure, the second area has a second microstructure, a specific volume of the second microstructure is greater than a specific volume of the first microstructure, and the third area is an unstructured flat area;
• S2), sequentially forming an absorbing layer, a dielectric layer and a reflecting layer on the undulating structure layer, wherein the reflecting layer is formed through vapor deposition, the dielectric layer is formed through printing, and the absorbing layer is formed through vapor deposition;
• S3), after the reflecting layer is formed, applying a printing process in a different thickness mode to form a protection layer, and the different thickness mode is that the minimum thickness of the protection layer of the first area is obviously greater than the minimum thickness of the protection layer of the second area;
• and
• S4), putting the semi-finished product in S3) in a corrosive atmosphere capable of reacting with a material of the reflecting layer for permeability improvement until the reflecting layer of the second area is completely or partially removed.