CN1164055A - Process for manufacture of non-replicable holograms possessing authenticity features and reading device to check authenticity - Google Patents

Abstract

The present invention relates to a process for the manufacture of non-replicable holograms possessing authenticity features which are copies of a master hologram. According to the invention, in order to form a master hologram, a hologram is taken of a randomly structured optical element, for example of a ground glass screen or a diffusor. The resulting hologram forms an authenticity feature, with an optical system which leads to a hologram with a pattern of lines that are parallel to one another.

Description

Be used to make the readout device of the method and the inspection authenticity of not reproducible hologram with authentication feature

The present invention relates to a kind of method that is used to make the not reproducible hologram with authentication feature, these holograms are duplicates of the hologram of benchmark, and relate to a kind of readout device that is better than inspection according to the authenticity of the hologram of this method making.

Aspect forming the hologram image of relief on the identification paper spare and guarantee authenticity on the trade mark goods, hologram is useful especially.But, have only them not utilize conventional holography system to duplicate with experienced adulterator by skilled, hologram just can provide desirable defencive function.

The objective of the invention is to propose a kind of method of the above-mentioned type, this method can be made the not reproducible hologram that can prove as the authenticity at all types of article or file, and this hologram can the authenticity to them reliably be checked in readout device apace.

Realize that according to the present invention this purpose is by utilizing a light-guiding system to obtain the hologram that forms authentication feature, the i.e. benchmark hologram of the optical element (for example Mo Guang a glass or a divergent mirror) that constitutes at random, wherein said optical system makes hologram have rectilinear figure.

When checking the authenticity of hologram, in fact need they are placed on the test position, each hologram is aimed at according to the micromechanism of their relevant figure on this position, but pays huge effort possibly like this.The hologram that the method according to this invention is made has a figure that comprises the linearity of some straight lines parallel to each other, like this in the process of reappearing tested hologram for along the mobile phase of the direction of straight line to insensitive.If in the process of reappearing tested hologram, the hologram of the straight line of this linearity figure of parallel alignment is laterally moved relative to this straight line.A bit reach correct test position at certain, making will be shinny as the feature of authenticity test, and can detect this shinny.

A preferred embodiment according to the inventive method, obtaining the optical system of benchmark hologram is made up of a kind of like this system, therein, target light is imaged on the glass screen of divergent mirror or polishing through cylindrical lens, and the target light wave is with the mode of almost parallel imaging optical system (fourier transform lens) collimation by the back, and making it on the hologram plane, form relevantly with a reference ray, the benchmark hologram just is formed on the photochromics that is distributed on the hologram plane in the mode of the figure of parallel lines like this.

Can not be according to the optical element that constitutes at random that in the benchmark hologram, is encoded of the present invention (for example Mo Guang glass screen or statistics phase-plate) by skilled adulterator's forgery with phase bit position stochastic distribution, because in order to forge, he need be after the operation that obtains hologram corresponding destruction optical element, and these optical elements can not obtain again, can not then produce hologram owing to have random structure.Because the benchmark hologram is the hologram of the optical element that constitutes at random, so can prevent to pass through copying and forging.

The adulterator in fact can not be by the secret hologram as the duplicate of benchmark hologram according to the benchmark formation of hologram, reappear identical benchmark hologram, because his need be when obtaining secret hologram used reference ray for this reason, and this light mode slight damage producing again in addition.

Can obtain according to reflection hologram or according to transmissive hologram according to secret hologram of the present invention.

For the secret hologram as authenticity proof is produced in batches, for example impress perforation by known method, and this secret hologram can be stamped in accordance with known methods on plastic sheeting aluminum or transparent in view of the above by the benchmark hologram.

In order to make, can provide the security feature of not reproducible known duplicate according to secret hologram of the present invention.For example prevent the effective protection of duplicating by secret hologram being impressed into provide in the film with calibration color.

Because contain the hologram information of coding by large quantities of holograms of the benchmark formation of hologram of making according to method of the present invention,, utilize it can discern the authenticity of hologram so must make special-purpose readout device.

This readout device must can be with the reasonable prices manufacturing, and can check the hologram as authenticity proof quickly and easily.

A kind ofly like this be used to check that according to of the present invention readout device by the authenticity of the hologram replication thing of benchmark formation of hologram is characterised in that, the laser that utilizes in a kind of appointment preferably utilizes in the array of optical elements of laser diode, but utilization has the reference ray of sense information (preferably energy distribution feature) makes a hologram of benchmark hologram (decode or read and use hologram), its feature also is, readout device has equally at the used array of optical elements of the process that obtains, and checked hologram replication thing is positioned the position of the benchmark hologram in making decoding hologram process; Its feature also is, utilization used checked hologram of reproduction irradiate light when making the decoding hologram, and by the irradiate light detecting device of reading with hologrm reconstruction, this detecting device detects the light intensity through convergent lens, divergent lens and cylindrical lens or cylindrical biconvex screen (divergent mirror of biconvex or one-dimensional).The detecting device that detects light intensity can be the CCD detecting device, and its detector element by rows.

In readout device according to the present invention, the hologram (using hologram by reading) that is examined authenticity reappears new is obtaining the reference ray that uses in reading with the hologram process, this light preferably has typical energy distribution, the diameter of reading light beam that convergent lens reduces to reappear, when it has been reduced to enough little diameter, become parallel wave then by divergent lens.The combination of convergent lens and divergent lens is referred to as Galilean telescope.Just can check like this and reappear the typical energy distribution of reading light wave; By cylindrical lens it is moved far, like this, the longitudinal axis that is moved light far away certainly intersects with the longitudinal axis of the detecting device that aligns with light beam transversal.

Have only real checked hologram to have the light wave of reading, thereby can detect this energy distribution, form the authenticity signal then by detecting device by reading with hologrm reconstruction in order to the energy distribution of representation faithfulness feature.

Laser beam has the characteristic of so-called spot (speckle) or particle (granulation), promptly they comprise have the light and shade spot " particle " (grain).If this dark spot incides detecting device, so that in the process of checking the hologram authenticity, can provide wrong information.In order to forbid that this corpuscular property occurs, in another embodiment of the present invention, provide a rotary glass plate, offset corpuscular property, detecting device can detected energy be distributed.According to a suitable rotary glass plate of coordinating mutually with the frequency of detecting device of frequency.

Can also adopt and suppress sex other method of particle.Therefore for example use the surface type detecting device to replace the linear CCD detecting device, and by in each row detector element scope, carrying out the influence that balance is eliminated corpuscular property.

In another embodiment of the present invention, checked hologram can rotate by an axle that is parallel to each straight line of hologram in readout device, and is provided with rotating driving device.Checked hologram must be aimed at along flattened edge in readout device, needn't strictly aim at along the direction that need obtain the hologram straight line.If in test process, move or rotate checked hologram according to a kind of like this mode, each straight line of hologram is moved relative to their portraitlandscape, hologram enters strict test position on a point, so real hologram will make the light of reading with typical energy distribution characteristics brighten, and utilizes detecting device can detect this brightening.

Utilize accompanying drawing to explain one embodiment of the present of invention in more detail below, wherein:

Fig. 1 summary is illustrated in the array of the optical element in the system that obtains the benchmark hologram;

Fig. 2 summary is illustrated in the array of optical elements of decoding in the readout device or reading hologram image;

Fig. 3 summary is illustrated in the array of the optical element of the photosystem in the readout device of checking tested hologram image authenticity, and

Fig. 4 is the top view that utilizes the detector that test light shines.

With reference to Fig. 1, the process that obtains of the hologram of benchmark is described below, this benchmark hologram is as the basis of producing in batches as the hologram of authenticity proof, and is used for being produced on reading of readout device and uses hologram.

Laser beam 1 is by columniform lens 2, and these lens 2 are imaged on the glass screen 3 of polishing target light with linear fashion 4, the optical element that these glass screen 3 representatives constitute at random.At the glass screen 3 of polishing with comprise location one fourier lense 6 between the hologram plate 5 of photochromics, lens 6 are f apart from the glass screen 3 of polishing and the distance of hologram plate 5, and fourier lense 6 will (on the glass screen 3 of polishing) changes parallel wavefront 7 into the target light of linear fashion bunchy.Photochromics and the reference ray 8 of this parallel wavefront on hologram plate 5 is relevant, makes record one hologram on this photochromics, the parallel rectilinear(-al) of the linearity figure that this hologram is produced by the light that has by different spatial distribution frequency.

The benchmark hologram of being got in hologram plate 5 includes the image as the glass screen 3 of the polishing of the stochastic distribution of the phase bit position of authenticity proof.

Fig. 1 is the optical system of representing with top view.

Utilize Fig. 2 to 4 to introduce readout device and its manufacturing below.

By the duplicate of benchmark hologram 5 or benchmark hologram, in readout device, make this and read the holographic Figure 10 that uses or decode, the same position place later appearance of this hologram in obtaining the readout device of this hologram.Use hologram in order to obtain to read, this true holographic Figure 11 is placed at such position of readout device, be that checked respectively reading with hologram also is positioned at this position in the later time, therefore holographic Figure 11 is corresponding with benchmark hologram or hologram replication thing.Utilize the laser of typical instrument to reappear light 12 by holographic Figure 11 then and come reconstruction wave 13, this Pohle is recorded on the photochromics that is located in the hologram plane 10 with the reference ray 14 of typical instrument.The holographic Figure 10 that makes in this manner forms to read and uses hologram.

Holographic Figure 11 can be the hologram of reflective or transmission-type.What Fig. 2 represented is an example of transmissive hologram.

Utilize Fig. 3 to introduce the basic structure of complete readout device below.

Holographic Figure 16 of examine is inserted in the seat, therein the straight flange of figure is clamped, or placed roughly by correct angle, holographic Figure 11 position is strict, uses holographic Figure 10 in order to obtain to read.Reading the back with holographic Figure 10, be positioned from the light of the reproduction of convergent lens 17, convergent lens 17 makes the light 18 of reproduction be compressed to less diameter, and suitably the light of compression incides divergent lens 19 then, forms the parallel rays of minor diameter through it.Open in the passage 21 that this light is shown by the online segment table of a cylindrical lens or cylindrical biconvex screen 20 divergent mirror of one dimension (convexo-convex or) then.As seen from Figure 4.In the passage that online segment table shows open light beam 21 incide then can rotary glass plate 22 for rectangle on.By rotary glass plate 22, the corpuscular property of laser beam is cancelled, straight line light 21 is laterally to incide detecting device from the visible mode of Fig. 4 like this, and corpuscular property is cancelled in this light.Detecting device 23 is exactly the described embodiment by the light activated element (CCD detecting device) of row distribution.

The seat of tested hologram 6 can turn round around an axle by a drive unit, and this is parallel to each straight line of the rectilinear figure of hologram.If in test operating procedure, rotate tested holographic Figure 16, this hologram enters correct test position on one point, make the light that reappears by holographic Figure 16 reappear light 14 by reading with holographic Figure 10, light 14 (be used to obtain hologram) has certain energy and distributes, and can utilize detecting device 22 to detect these energy distribution.

Cylindrical lens 20 or cylindrical biconvex screen or one-dimensional divergent mirror will be tested light 21 and move far, and it is always intersected on detecting device 23.

Claims (6)

1. One kind be used to make have authentication feature, as the method for benchmark hologram replication hologram thing, not reproducible, it is characterized in that,

   Utilize a kind of optical system to obtain a hologram, promptly, the benchmark hologram of the optical element of Gou Chenging at random, this optical element is glass screen or the divergent mirror for polishing for example, this hologram becomes authentication feature, and wherein said optical system makes a hologram have the figure that is formed by straight line parallel to each other.
2. 2. method according to claim 1, it is characterized in that, this optical system comprises such system, target light is imaged on the glass screen of divergent mirror or polishing by cylindrical lens with linear fashion in this system, and in this system, make the imaging optic element rough collimate in parallel of target light wave by the back, and relevant with a reference light on the photochromics on hologram plane, make that on the photochromics that is arranged in the hologram plane form with the figure of parallel lines obtains the benchmark hologram.
3. 3. a readout device that is used to check the authenticity of the hologram replication thing of making according to the method for claim 1 or 2 is characterized in that,

   In the array of optical elements of an appointment, utilize a laser instrument, preferably a kind of laser diode, utilize one have read with information preferably the reference ray of energy distribution feature make the hologram (decode or read hologram) of benchmark hologram, feature also is, readout device has array of optical elements used in obtaining process equally, tested hologram replication thing is positioned at makes the position that this reads the benchmark hologram when using hologram, feature is that also being used to make the reproduction light of reading with hologram shines checked hologram, and, detect through convergent lens from reading reproduction irradiate light with hologram to detecting device, the light intensity of divergent lens and column type lens or cylindrical biconvex screen or one-dimensional divergent mirror.
4. 4. readout device according to claim 3 is characterized in that, the glass plate that has rotating driving device is between cylindrical lens and detecting device.
5. 5. according to claim 3 or 4 described readout devices, it is characterized in that detected hologram can rotate around an axle that is parallel to the hologram straight line of this tested hologram, and a rotating driving device is housed in readout device.
6. 6. according to described readout device one of in the claim 3 to 5, it is characterized in that, rotary glass plate or surface detectors be the position between cylindrical lens, cylindrical biconvex screen or one-dimensional divergent mirror and detecting device, in order on each row detector element by eliminating the corpuscular property of light.

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