FIELD: physics.
SUBSTANCE: protective mark comprises the ply with concealed image and reflecting ply. Note here that play with concealed polarisation image has isotropic and anisotropic areas. Note also that ply with concealed polarisation image can be polarised in phase and represents a quarter-wave plate.
EFFECT: higher level of protection against counterfeit and copying.
11 cl, 3 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| PROTECTIVE MARK | 2013 |
|
RU2544144C1 |
| OPTICAL PROTECTIVE DEVICE (VERSIONS), METHOD OF MANUFACTURING OF THE SPECIFIED DEVICE AND METHOD OF VERIFICATION OF THE PROTECTED OBJECT CONTAINING THE SPECIFIED OPTICAL PROTECTIVE DEVICE | 2019 |
|
RU2725667C1 |
| METHOD OF MAKING OPTICAL TWO-WAY REFLECTING PROTECTIVE APPARATUS AND PROTECTIVE APPARATUS MADE USING SAID METHOD | 2008 |
|
RU2403601C2 |
| FILM WITH POLYMER LAYER | 2005 |
|
RU2362684C2 |
| PROTECTIVE DEVICE BASED ON ZERO-ORDER DIFFRACTIVE STRUCTURES | 2022 |
|
RU2801793C1 |
| SECURITY ELEMENT FOR IDENTIFICATION OF ARTICLES | 2013 |
|
RU2533209C1 |
| MULTILAYER PROTECTIVE OPTICAL DIFFRACTION-POLARIZATION DEVICE, A METHOD FOR MANUFACTURING THE SPECIFIED DEVICE, A PROTECTED PRODUCT CONTAINING THE SPECIFIED MULTILAYER PROTECTIVE OPTICAL DIFFRACTION-POLARIZATION DEVICE | 2021 |
|
RU2763388C1 |
| POLARIZING FILTER-DEPOLARIZER | 2022 |
|
RU2790789C1 |
| COMPOSITE MARK | 2008 |
|
RU2431193C2 |
| PROTECTIVE ELEMENT AND METHOD OF ITS MANUFACTURING | 2009 |
|
RU2483934C2 |
