CN1153359A - Device for making hidden holographic cryptogram using liht Moire effect - Google Patents
Device for making hidden holographic cryptogram using liht Moire effect Download PDFInfo
- Publication number
- CN1153359A CN1153359A CN 96100427 CN96100427A CN1153359A CN 1153359 A CN1153359 A CN 1153359A CN 96100427 CN96100427 CN 96100427 CN 96100427 A CN96100427 A CN 96100427A CN 1153359 A CN1153359 A CN 1153359A
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- black
- pattern
- holographic
- white transparency
- transparency film
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Abstract
An apparatus for generating encrypted hologram by laser features that laser beam irradiates via diffusion filter to transparent black-white film containing pattern, the film is closely in contact with photoresist-coated plate, and the laser bean then irradiates via said film to the photoresist-coated plate. With said apparatus, hidden cipher and decipher plate are made. The cipher is invisual, so it is imposible to forge. In decipher, its optical channel is not complex. The apparatus can be used to make and certificate important credentials.
Description
The present invention relates to a kind of laser of using and obtain the device that hologram is encrypted.
Since invention seventies moulding holographic technology, embossed hologram is applied in the product of all kinds of certificates with regard to being made into anti-counterfeiting mark.
The CN2201684Y patent disclosure a kind of two dimension rainbow hologram producing device that glitters, the output of laser instrument is divided into thing light and reference light through reflection group and spectroscope, reference light after expanding bundle and filtering direct projection to mask and holographic plate; Thing light is restrainted into hot spot and is thrown to frosted glass through expansion, is mapped to mask and holographic plate again.
The CN2201685Y patent disclosure one step of a kind of single beam copy legal system make the device of rainbow hologram, the output of laser instrument is the direct projection mask after expanding the band wave filter, mask, rainbow mother matrix and holographicly fixedly be on the plate rack in regular turn in the version three.
The CN2210407Y patent disclosure a kind of filming apparatus of multi-faceted holo-rainbow ornament materials mother matrix, the output of laser instrument becomes two bundles through beam split, respectively after reflection again through expanding bundle, filtering, and is mapped on the mask with same incident angle.
Said apparatus all can obtain respond well hologram, but does not have encryption measures.Though utilize the means of optics Fourier transformation can make holographic cipher, be generally and manifest type." making latent type holographic cipher on certificate forges with imitative " is that a kind of of people craves for for a long time." hidden-type password " refers to usually with the naked eye and can't see, and the password that must just can see with any special measures, this password be well suited for be produced on I.D., passport, bank card etc. must be through on the important certificate of a certain department reviews.The Goodman of the U.S. teaches the technology that once proposed with " aberration medium compensation aberration " and realizes the holographic encryption of hidden-type in " paying upright leaf optics introduction " book, though the theoretical proof of the method is very perfect, the difficulty but decode procedure is but quite complicated is so be difficult to use in practice.
It is easy that purpose of the present invention aims to provide a kind of making, the device of the making hidden-type holographic cipher that anti-counterfeit capability is strong.
The present invention includes laser instrument, expand bundle wave filter, black and white transparency film and photoetching hectograph with pattern, the light path setting of each parts be from the laser beam of laser instrument output after expanding the bundle wave filter and expanding bundle and filtering, be mapped on the black and white transparency film with pattern, black and white transparency film closely contacts with the photoetching hectograph, at last, the light beam that sees through black and white transparency film is incident upon the photoetching hectograph, promptly finishes its record and makes.
From the optics Mohr theory as can be known, the roughly the same periodically variable pattern in any two fringe spacings overlaps and the angle that staggers mutually, will form Mohr's circle.Different periodicity patterns or the different angles that staggers will form different Mohr's circles.Select two patterns, with one of them with holographic method make the embossed hologram thermoprint on certificate as password; Another pattern also is recorded on the transparent panel as decoding deck with holographic method, preserves by certificate examination department.When examination of document, audit crew just can be seen the Mohr's circle of expection as long as decoding deck is placed on certificate to be had the local of password and turn over an angle.If do not have password or password difference on the certificate, just can't see the Mohr's circle of expection, confirm that promptly certificate forges.
The record of holographic cipher and decoding deck all with photoresist the version.The photoetching hectograph is a phase-type, if with single beam pattern is copied on the photoetching hectograph, naked eyes also be can't see the existence of pattern, have only when two patterns are overlapping and just can see Mohr's circle, so the adulterator can't know the pattern of password and decoding deck, also just can't copy.And when decoding needn't complicated light path, and can make numerous, so can test to the true and false of certificate with the place at any time easily.
Fig. 1 is provided with figure for the light path of this device.
In the drawings, provide the holographic recording optical path setting of this device, whole device is made of laser instrument (1), expansion bundle wave filter (2), the black and white transparency film (3) with pattern and photoetching hectograph (4).The structure of this device is same for the record of holographic cipher and decoding deck, and just the pattern that adopts on the slide may be different.In this device, slide must closely contact with the photoetching hectograph.If the photoetching hectograph of record password has had the pattern of certain hologram marking, then password can be recorded certain position in the hologram marking, version is made embossed hologram with photoresist then.The photoetching hectograph of carrying recorded decoding plate pattern is exactly a decoding deck after developing, and needn't carry out any conversion again.
Claims (1)
1. utilize the light Moire effect to make the device of hidden-type holographic cipher, it is characterized in that comprising laser instrument, expand bundle wave filter, black and white transparency film and photoetching hectograph with pattern, the light path setting of each parts be from the laser beam of laser instrument output after expanding the bundle wave filter and expanding bundle and filtering, be mapped on the black and white transparency film with pattern, black and white transparency film closely contacts with the photoetching hectograph, and the light beam that sees through black and white transparency film is incident upon the photoetching hectograph.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96100427 CN1110012C (en) | 1996-02-05 | 1996-02-05 | Device for making hidden holographic cryptogram using liht Moire effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96100427 CN1110012C (en) | 1996-02-05 | 1996-02-05 | Device for making hidden holographic cryptogram using liht Moire effect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1153359A true CN1153359A (en) | 1997-07-02 |
| CN1110012C CN1110012C (en) | 2003-05-28 |
Family
ID=5116599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96100427 Expired - Fee Related CN1110012C (en) | 1996-02-05 | 1996-02-05 | Device for making hidden holographic cryptogram using liht Moire effect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1110012C (en) |
-
1996
- 1996-02-05 CN CN 96100427 patent/CN1110012C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1110012C (en) | 2003-05-28 |
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