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    OPTICAL CONSTRUCTION INCLUDING LENS FILM AND MULTILAYER MASK
    16.
    发明公开
    OPTICAL CONSTRUCTION INCLUDING LENS FILM AND MULTILAYER MASK 审中-公开

    公开(公告)号：US20240045115A1

    公开(公告)日：2024-02-08

    申请号：US18265742

    申请日：2021-12-14

    Applicant: 3M INNOVATIVE PROPERTIES COMPANY

    Inventor： Neeraj Sharma ,  Przemyslaw P. Markowicz ,  Daniel J. Schmidt ,  Timothy J. Reddy ,  Mark A. Roehrig

    IPC: G02B3/00 ,  G02B27/09

    CPC classification number: G02B3/0056 ,  G02B27/0988 ,  G02B3/0012

    Abstract: An optical construction includes a lens film having outermost first and second major surfaces. The first major surface includes a plurality of microlenses. A multilayer mask having an average thickness of less than about 0.5 times an average focal length of the microlenses and an optical density of greater than about 2 is disposed on the second major surface. The multilayer mask includes polymeric first and second mask layers where each of the first and second mask layers has an optical density of greater than about 0.3. The multilayer mask defines a plurality of laser-ablated through openings therein that are aligned to the microlenses in a one-to-one correspondence. An optical transmittance of the optical construction as a function of the incident angle has a transmitted peak having a peak transmittance T1 and a corresponding full width at 20 percent of maximum W1, where T1/W1≥2.4%/degree.

    Articles including infrared absorptive material and comprising radiation-treated and non-radiation-treated regions
    18.
    发明授权
    Articles including infrared absorptive material and comprising radiation-treated and non-radiation-treated regions 有权

    公开(公告)号：US11602948B2

    公开(公告)日：2023-03-14

    申请号：US16060500

    申请日：2016-12-06

    Applicant: 3M INNOVATIVE PROPERTIES COMPANY

    Inventor： Tadesse G. Nigatu ,  Suman K. Patel ,  Craig A. Schmidt ,  Lee A. Pavelka ,  Neeraj Sharma

    IPC: B42D25/23 ,  B42D25/24 ,  B42D25/29 ,  B42D25/425 ,  B42D25/382 ,  B42D25/41 ,  B42D25/324

    Abstract: Techniques are described in which articles (e.g., security documents, traffic signage and personal protective equipment) are formed to include an infrared absorptive material. In some instances, the infrared absorptive material includes a reduced tungsten oxide, such as cesium tungsten oxide, calcium tungsten oxide, potassium tungsten oxide, or the like, and exposed to radiation such that one or more regions of the security document has a modified appearance, thereby providing a visual marking or information on the article. Example articles include at least one layer including a polymer and an infrared absorptive material including a reduced tungsten oxide. The layer includes a radiation-treated region that exhibits a first appearance under visible light and at least one non-radiation-treated region that exhibits a second, different appearance under visible light. The at least one radiation-treated region may be formed by exposing the at least one radiation-treated region to infrared light to change at least one property of the reduced tungsten oxide in the radiation-treated region compared to the reduced tungsten oxide in the non-radiation-treated region. The first appearance may be whiter than the second appearance.

    Optical camouflage filters
    20.
    发明授权
    Optical camouflage filters 有权

    公开(公告)号：US11269121B2

    公开(公告)日：2022-03-08

    申请号：US16071544

    申请日：2016-05-06

    Applicant: 3M INNOVATIVE PROPERTIES COMPANY

    Inventor： Guanglei Du ,  John A. Wheatley ,  Yi Hang Lv ,  Anthony M. Renstrom ,  Neeraj Sharma ,  Fuguo Xu

    IPC: G02B5/26 ,  G02B5/22 ,  G02B5/20 ,  G02B5/28

    Abstract: A system may include one or both of a light emitter (46) and a light receiver (40), and an optical filter (10). The optical filter (10) includes a wavelength selective scattering layer (14). The wavelength selective scattering layer (14) may have a near-infrared scattering ratio of less than about 0.9. The filter (10) may have a visible reflective haze ratio of greater than about 0.5. A method may include disposing the wavelength selective scattering layer (14) adjacent one or both of the light emitter (46) and the light receiver (40). The optical filter (10) may include a wavelength selective reflective layer (16). The optical filter (10) may include a wavelength selective absorbing layer (34). An article may include the optical filter (10). The wavelength selective scattering layer (14) may have an average near-infrared scattering of less than 60%, an average visible scattering of greater than 10%, and a difference between the % total visible reflectance and the % diffuse visible reflectance of less than 20.

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