CN102346424A

CN102346424A - Dynamic reproduction method for grating encrypted message

Info

Publication number: CN102346424A
Application number: CN2010102427484A
Authority: CN
Inventors: 张树森
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-07-30
Filing date: 2010-07-30
Publication date: 2012-02-08

Abstract

The invention belongs to the technical field of anti-forgery, which aims to provide a dynamic reproduction method for a grating encrypted message. The dynamic reproduction method for the grating encrypted message specifically comprises the following steps: manufacturing a group of continuously changed images into diffraction grating patterns which conceal original image information by information encryption; combining the diffraction grating patterns by taking the diffraction grating patterns as optical plane elements; manufacturing the diffraction grating patterns on a logo (such as a laser holographic logo) of a plastic substrate in an embossment structure form, wherein human eyes cannot identify the patterns; and combining the optical plane elements to obtain continuous encryption information. When laser reproduction is carried out, a laser beam scans and moves on the combined optical plane elements, and the reproduced patterns can dynamically reproduce continuously changed images. For example, in a picture, the image of a continuously rotating letter A is converted into a combination 1 of the optical plane elements and is manufactured on a holographic anti-fake logo 2. When the laser beam scans the combination 1, the laser beam is reflected by a logo aluminium coating, and the rotating process of the letter A can be seen from white paper after the white paper is put on the light path of the reflected light.

Description

The dynamic reproducting method of grating encryption information

Technical field

The invention belongs to laser hologram information encryption field of anti-counterfeit technology, be specifically related to a kind of method that realizes that grating encryption information is dynamically reproduced.

Background technology

At present, are the various types of smooth holographic techniques that utilize multilayered medium membrane structure, the optical grating construction of book film interference effect and utilize the information optics notion in the false proof main means of optical field.The optical effect that on hologram marking, utilizes various technological means to change grating increases the effort of anti-counterfeiting power, is referred to as the diffraction optics changeable pattern in the world.

In general; What these changeable patterns changed only is the different piece of same width of cloth pattern; When being variation of eye-observation angle or the change of pattern orientation; The pattern difference that observed pattern color variation has taken place or seen; For example; Revolve the pattern of seeing when turning 90 degrees, color has become green by redness, or the pattern of seeing has become B by A.And under the situation that holographic information is encrypted, the reproduction pattern that can see all is a fixing pattern.

If can overcome above-mentioned deficiency, make pattern dynamic change continuously, will strengthen the anti-counterfeiting power of anti-counterfeiting mark greatly undoubtedly.

In order to overcome the deficiency of said method, make pattern dynamic change continuously, the present invention provides a kind of grating encryption information to realize the method for dynamically reproducing, and will strengthen the anti-counterfeiting power of anti-counterfeiting mark greatly undoubtedly.

Summary of the invention

The object of the present invention is to provide a kind of grating encryption information to realize the method for dynamically reproducing; When the anti-counterfeiting mark that this method is made moves under laser radiation; The dynamic pattern that reproduces can demonstrate one group of continuous action or profile variation, and its anti-counterfeiting power improves a lot.

A kind of grating encryption information provided by the invention realizes the dynamically method of reproduction, and its step comprises: (treating to be inserted by the procurator after claims are confirmed)

The present invention calculates one group of continuous images through information encryption; Making becomes the diffraction grating pattern of having hidden raw information; And with it as plane optics holographic element, be fabricated on the laser holographic mark, these elements have obtained continuous enciphered message through combination.When reproducing, these patterns can be realized dynamically continuous appearance, have reproduced the preceding continuous action of information encryption.The present invention carries out information encryption with continuous images, makes up as the plane optical elements, its form with the relief type modulated grating is produced on the holographic anti-counterfeiting label again.This hiding Info because human eye can't interpretation is one group of continuous hiding Info in addition, even local information maybe be by counterfeit, but the counterfeit of the overall situation then can't be accomplished; Therefore make that forging difficulty increases, anti-counterfeiting power is improved.

Description of drawings

Fig. 1 is a plane optical elements conversion principle schematic;

Fig. 2 is the synoptic diagram that one group of teapot Image Dynamic is rotated;

Fig. 3 rotates the corresponding plane optical elements of teapot image for this group;

Fig. 4 is for forming the arrangement mode of plane optics element sequence;

Fig. 5 is laser radiation, the dynamic reproduction synoptic diagram of reflex time letter A;

Fig. 6 is laser radiation, the dynamic reproduction synoptic diagram of letter A when transparent.

Embodiment

The step of the inventive method is:

(1) selected arbitrarily one group of consecutive image is as dynamic encryption frame to be hidden;

(2) the enciphered message image transformation is become a kind of plane optical elements.

Plane optical elements conversion principle is following:

If the plane optical elements with function U (a branch of plane light wave shines on the optical elements of plane for ξ, η) expression, through forming images behind the diffraction, transform be I (x, y).(x, y) as information to be hidden, then (ξ just is concealed with I (x, information y) in η) to plane optical elements U with transform I.

(x, under situation y), (ξ η), makes and this plane optical elements under laser radiation, can reproduce I (x y), is the key that realizes that grating encryption information is dynamically reproduced how to try to achieve plane optical elements U at known I.

Make planar optical element?

If the formula amplitude A is a constant, then U (ξ, η) is a pure phase function.Solution U (ξ, η) is equivalent to solving the phase function?

Phase function?

can not directly use optical methods to achieve, by the computer can be calculated according to certain algorithms.Reversibility principle of the optical path can be subject to the hidden information I (x, y) is an ideal pattern of looking at the diffuser, in the light of the pattern information to be hidden in the plane (ξ, η) on the image is hidden of I (x, y) plane of the optical element information U (ξ, η) of the phase function? from I (x, y) pattern of uniformly diffuse light emitted radiation in the plane (ξ, η), and therefore plane (ξ , η) of the light amplitude a is a constant, and I (x, y) all of the information pattern is uniformly expanded to the plane (ξ, η) on.Thus, the diffusion characteristics to be reproduced in I (x, y) in the pattern, as long as the log I (x, y) pattern on a plane (ξ, η) is imaged on the phase information of the light thus obtained is planar optical element U (ξ, η) of the phase function?

shown in Figure 1.

The ultimate principle of plane optical elements conversion that Here it is.

(3) selected one group of consecutive image to be hidden; 3 width of cloth teapot image a, b, c for example shown in Figure 2; Each width of cloth image to wherein all carries out plane optical elements conversion, obtains one group of corresponding plane optical elements, 3 plane optical elements a1 as shown in Figure 3, b1, c1.

Wherein, a1, b1, the corresponding a of c1 difference, b, c.

In fact the plane optical elements is exactly the grating pattern of having hidden information, is a kind of method of grating encryption information.

Plane optics element combinations is become the pattern that can dynamically reproduce; Can reproduce dynamically that the combinations of patterns mode can adopt horizontally, homeotropic alignment or various array configuration, as shown in Figure 4, so just obtain a plane optics element sequence.

When adopting laser reconstruction, laser beam scan mobile on the optics element sequence of the plane of anti-counterfeiting mark, just can dynamically reproduce the continually varying pattern.For one group of teapot pattern shown in the legend; Corresponding plane optics arrangement of elements is become the sequence shown in Fig. 4 (d); When laser beam moves on this plane optics element sequence from left to right; Just can reproduce the teapot rotating process; Can see that spout of a teapot has moved to the right from the left side, teapot integral body has been rotated 180 degree.As an example, only drawn 3 width of cloth patterns in this example, during actual fabrication, in order to show the continuity of change in pattern better, more several continually varying patterns can draw.

In sum; Earlier one group of information (literal or pattern) (pattern for example shown in Figure 2) is passed through plane optical elements conversion according to the ultimate principle of optical imagery; Obtain plane optical elements shown in Figure 3; Be combined into plane optics element sequence shown in Figure 4; And be produced on the sign (for example laser holographic mark) of plastic-substrates with the embossment structure form, just obtain the effect of the dynamic reproduction of enciphered message.

With Fig. 5 is example.Fig. 5 is the synoptic diagram that enciphered message is dynamically reproduced.In Fig. 5; The plane optics element sequence 1 of the set of diagrams case that letter A rotates is produced on the holographic anti-counterfeiting label 2; When with laser beam 3 plane of scanning motion optical elements sequences; Through the reflection of the aluminium coated on the hologram marking; On catoptrical light path, put a blank sheet of paper (or other plane that can form images) 4, just can on this blank sheet of paper, see alphabetical A rotating process.

Also the plane optics element sequence 1 of the set of diagrams case that alphabetical A can be rotated is produced on the transparent plastic film 5, and as shown in Figure 6, laser beam 3 scannings also can show alphabetical A rotating process on the blank sheet of paper 4 of transmitted light path when reproducing.

Claims

1. realize the dynamically method of reproduction of grating encryption information for one kind.Selected one group of consecutive image to be hidden; Each width of cloth image to wherein all carries out plane optical elements conversion; Obtain one group of corresponding plane optical elements (promptly having hidden the grating pattern of information); Plane optics element combinations is become the plane optics element sequence that can dynamically reproduce, and array mode can adopt horizontally, homeotropic alignment or various array configuration.

Laser beam scans on the optics element sequence of plane and moves, and just can dynamically reproduce the continually varying pattern.