MACHINE-READABLE OPTICAL SECURITY DEVICE
    5.
    发明公开

    公开(公告)号:EP4026702A1

    公开(公告)日:2022-07-13

    申请号:EP22159102.7

    申请日:2018-01-11

    申请人: Crane & Co., Inc.

    IPC分类号: B42D25/382 B42D25/387

    摘要: An IR and/or UV machine-readable optical security device (e.g., micro-optic security thread) that is made up of at least one IR-absorbing component with a characteristic IR signature detectable at two or more IR-wavelengths, at least one UV-absorbing component with a characteristic UV signature detectable at two or more UVwavelengths, at least one IR-absorbing component that absorbs IR light and emits light at a different invisible wavelength, at least one UV-absorbing component that absorbs UV light and emits light at a different invisible wavelength, or a combination thereof, is provided. The IR and UV machine-readable features do not interfere with the optical effects projected by the optical material.