FIELD: physics, optics.
SUBSTANCE: invention relates to protection of documents from falsification and a method of obtaining an image which identifies authenticity of a data medium. When carrying out the method, image pixels are divided into sub-pixel regions, each being a diffraction grating which reflects one of the primary colours. An image is formed by partially breaking down diffraction gratings into sub-pixel regions. The gratings are broken down by laser engraving by modulating intensity, duration and the number of laser pulses using precise positioning of the laser beam on elements of the pixel matrix and special-purpose optical marks.
EFFECT: simplification of the method and forming images in one diffraction layer.
8 cl, 1 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| MULTILAYERED POLYMERIC PRODUCT, SUCH AS IDENTIFICATION DOCUMENT | 2014 |
|
RU2566421C1 |
| METHOD OF PRODUCING A MULTILAYER POLYMER PROTECTED ARTICLE WITH AN IDENTIFYING OPTICALLY VARIABLE IMAGE WITH INSTRUMENT-DETERMINED FEATURES AND A MULTILAYER ARTICLE WITH AN IDENTIFYING OPTICALLY VARIABLE IMAGE | 2019 |
|
RU2725793C1 |
| VALUABLE DOCUMENT COMPRISING MULTILAYER POLYMER STRUCTURE, AND METHOD OF PERSONALISING VALUABLE DOCUMENT | 2015 |
|
RU2588463C1 |
| POLYMER LAYERED COMPOSITE FOR DOCUMENT OF VALUE | 2013 |
|
RU2546437C1 |
| SECURED DOCUMENT WITH PERSONALIZED IMAGE MADE USING METAL HOLOGRAM AND METHOD FOR ITS MANUFACTURE | 2020 |
|
RU2811489C1 |
| METHOD OF PRODUCING COLOUR LASER IMAGE WITH HIGH REFLECTING POWER AND DOCUMENT WITH SAID COLOUR LASER IMAGE | 2012 |
|
RU2584670C2 |
| PROTECTIVE ELEMENT FOR IDENTIFICATION OF DOCUMENT, IDENTIFICATION DOCUMENT AND METHOD FOR ITS PERSONALIZING | 2015 |
|
RU2599000C1 |
| AUTOSTEREOSCOPIC DISPLAY DEVICE AND EXCITATION METHOD | 2015 |
|
RU2695285C2 |
| INFORMATION CARRIER | 1994 |
|
RU2079167C1 |
| AUTOSTEREOSCOPIC DISPLAY DEVICE AND EXCITATION METHOD | 2015 |
|
RU2695941C2 |
