CN207502761U - Optical polarization false-proof film based on liquid crystal aligning technology - Google Patents

Abstract

The utility model discloses a kind of optical polarization false-proof films based on liquid crystal aligning technology, include film substrate, reflective membrane, alignment films, liquid crystal film and protective film successively from top to bottom.Under the conditions of natural light, any pattern identification for being invisible to the naked eye on the film；Polarizer is placed in above false-proof film, and eyes, which are located above polarizer, to be observed, it can be seen that hiding security pattern mark.The utility model is a kind of composite anti-fake technology for combining image false-proof, digital code anti-false and material system, has very high technical barrier, is difficult to be imitated within a certain period of time；The optical polarization false-proof film of the utility model can online production, it is and at low cost, be suitble to mass printing and use.

Description

Optical polarization anti-counterfeiting film based on liquid crystal alignment technology

technical field

The utility model relates to an anti-counterfeiting product, in particular to an optical polarization anti-counterfeiting film based on liquid crystal orientation technology.

Background technique

Anti-counterfeiting products are products made of anti-counterfeiting technology for the purpose of anti-counterfeiting and have anti-counterfeiting functions. Now the market, from famous brand luxury goods to daily necessities, even coins, is full of counterfeit and shoddy products or counterfeit products. Anti-counterfeiting products have been widely used in tobacco packaging, alcohol packaging, pharmaceutical packaging, cosmetic packaging, lottery tickets, invoices and other fields. However, there are many problems in the current anti-counterfeiting market technology. The traditional anti-counterfeiting technology has a low threshold and is easy to manufacture and copy. As a result, counterfeiters can easily make anti-counterfeiting labels, such as: fluorescent ink anti-counterfeiting, laser holographic image anti-counterfeiting, digital watermark anti-counterfeiting, etc. The improvement of anti-counterfeiting technology has become a key factor in curbing counterfeiting.

Optical polarization anti-counterfeiting technology, which uses the polarization characteristics of light to extract anti-counterfeiting information, is a new type of anti-counterfeiting technology product. Due to its unique optical birefringence characteristics, liquid crystal materials can structurally produce specific phase retardation, which provides feasibility for polarization anti-counterfeiting technology. Through techniques such as rubbing alignment or optical alignment, the anti-counterfeiting mark is converted into a mark with optical polarization characteristics and printed on the liquid crystal layer in the label, which cannot be seen by normal naked eyes, but can only be seen through an analyzer film Anti-counterfeit labels. This technology is a composite anti-counterfeiting technology that combines image anti-counterfeiting, digital anti-counterfeiting and material systems. It has high technical barriers and is difficult to be imitated within a certain period of time.

Utility model content

Purpose of the invention: To solve the above problems, the utility model proposes an optical polarization anti-counterfeiting film based on liquid crystal alignment technology.

Technical solution: In order to achieve the above design purpose, the technical solution adopted by the utility model is: an optically polarized anti-counterfeiting film based on liquid crystal orientation technology, which includes a film base, a reflective film, an orientation film, a liquid crystal film and a protective film from bottom to top. membrane.

Further, the alignment film is a layer of chemical material that induces alignment of liquid crystal molecules.

Further, the liquid crystal film is a layer of liquid crystal molecular material, and the liquid crystal molecules are patterned and oriented.

Further, the anti-counterfeiting pattern mark is transformed into polarization information of light.

Further, the anti-counterfeiting pattern marks are transformed into different orientations of liquid crystal molecules on the liquid crystal material.

Beneficial effects: the utility model is a composite anti-counterfeiting technology that integrates image anti-counterfeiting, digital anti-counterfeiting and material systems, has high technical barriers, and is difficult to be imitated within a certain period of time; the optical polarization anti-counterfeiting film of the utility model can be used online Production, and low cost, suitable for mass printing and use.

Description of drawings

Fig. 1 is the structure schematic diagram of the optical polarization anti-counterfeiting film based on the liquid crystal alignment technology of the utility model;

Fig. 2 is a schematic diagram of the authenticity inspection method of the optical polarization anti-counterfeiting film based on the liquid crystal alignment technology of the present invention.

Detailed ways

The technical scheme of the utility model is further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the optical polarization anti-counterfeiting film described in the utility model is a multi-layer film structure, including a film substrate 1, a reflective film 2, an orientation film 3, a liquid crystal film 4 and a protective film 5, sequentially from bottom to top arrangement. Wherein, the film substrate 1 is the attachment substrate of the anti-counterfeiting film, which can be any material; the reflective film 2 is a layer of reflective film coated on the film substrate 1; the orientation film 3 is a chemical material that can induce the alignment of liquid crystal molecules ; The liquid crystal film 4 is a layer of liquid crystal molecular material; the protective film 5 is a layer of ordinary thin film, used to protect the structure from being damaged.

The utility model converts the anti-counterfeiting pattern logo into light polarization information and hides it in the film, and the anti-counterfeiting pattern logo is transferred to the liquid crystal material in the film as different orientations of liquid crystal molecules, and the naked eye cannot see the polarized information on the film under natural light conditions. Any pattern logo; the hidden anti-counterfeiting pattern logo can only be seen through a polarizer 6 .

As shown in Figure 2, the authenticity inspection method of the optically polarized anti-counterfeiting film described in the utility model, natural light becomes linearly polarized light after passing through the polarizer 6, and passes through the protective film 5 downwards, and when passing through the liquid crystal film 4, Because its liquid crystal polymer has been oriented in a pattern, the polarization of light changes as it passes through the patterned areas, while the polarization of the rest remains unchanged. It is then reflected by the reflective film 3, passes through the liquid crystal film 4, the protective film 5 and the polarizer 6 again, and is finally seen by the eyes 7.

At this time, there will be light and dark differences between the area with the pattern and the area without the pattern, so that the specific anti-counterfeiting pattern logo can be seen, and when the polarizer 6 is rotated, different pattern contrasts will be presented. The anti-counterfeiting pattern mark can be a specific word, letter or Logo and the like. The optical polarization anti-counterfeit film of the utility model can be produced on-line, has low cost, and is suitable for batch printing and use.

Claims (5)

1. An optically polarized anti-counterfeiting film based on liquid crystal alignment technology, characterized in that: from bottom to top, it comprises film base (1), reflective film (2), alignment film (3), liquid crystal film (4) and protective film (5). 2. The optical polarization anti-counterfeiting film based on liquid crystal alignment technology according to claim 1, characterized in that: the alignment film (3) is a layer of chemical material that induces alignment of liquid crystal molecules. 3. The optical polarization anti-counterfeiting film based on liquid crystal alignment technology according to claim 1, characterized in that: the liquid crystal film (4) is a layer of liquid crystal molecular material, and the liquid crystal molecules are patterned and aligned. 4. The optical polarizing anti-counterfeiting film based on liquid crystal alignment technology according to claim 1, characterized in that: the anti-counterfeiting pattern mark is transformed into polarization information of light. 5. The optical polarizing anti-counterfeiting film based on liquid crystal alignment technology according to claim 1, characterized in that: the anti-counterfeiting pattern marks are transformed into different orientations of liquid crystal molecules on the liquid crystal material.