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    WAVEGUIDE AND AUGMENTED/MIXED REALITY DEVICE
    12.
    发明公开
    WAVEGUIDE AND AUGMENTED/MIXED REALITY DEVICE 审中-公开

    公开(公告)号：US20240094543A1

    公开(公告)日：2024-03-21

    申请号：US18470069

    申请日：2023-09-19

    Applicant: Schott AG

    Inventor： Frank-Thomas Lentes ,  Clemens Ottermann ,  Stefan Weidlich

    IPC: G02B27/01

    CPC classification number: G02B27/0172 ,  G02B2027/011

    Abstract: A waveguide for guiding an image pixel light includes: a solid body including an optical material which is transparent for at least a light with a wavelength of 460 nm; an in-coupling surface located on the solid body; and an out-coupling surface located on the solid body, wherein the optical material has an absorption coefficient κ460 nm for light having a wavelength of 460 nm, a thermal conductivity k, a coefficient of thermal expansion α20° C. at a temperature of 20° C., a refractive index nF related to the hydrogen F-line, and a derivative dnF/dT20° C. which are related in such a way that a thermally induced change of an optical path length within the waveguide due to an absorption of at least one of heat and an optical radiation is quantitatively described by a merit function.

    Method for testing the strength of sheets made of hard brittle material under tensile stress
    15.
    发明授权
    Method for testing the strength of sheets made of hard brittle material under tensile stress 有权

    公开(公告)号：US10571376B2

    公开(公告)日：2020-02-25

    申请号：US15261409

    申请日：2016-09-09

    Applicant: SCHOTT AG

    Inventor： Martin Lotze ,  Thomas Roßmeier ,  Clemens Ottermann ,  Volker Seibert

    IPC: G01N33/38 ,  G01N3/20

    Abstract: A method for testing the strength of a sheet-like element having two opposite faces and made of hard brittle material under tensile stress is provided. The method includes passing each of the faces of the element over a roller and thereby bending the element so that each of the faces is subjected to a first tensile stress in a portion in which the opposite face is in contact with a surface of the roller; exerting a second tensile force on the element in the direction of advancement so that both faces are subjected to the second tensile stress of at least 2 MPa so that the first and second tensile stresses add up to define a resultant tensile stress; and monitoring the element and determining whether the element has a defined breaking strength equal to the resultant tensile stress or whether the element breaks under the resultant tensile stress.

    Apparatus for testing the strength of sheets made of hard brittle material under tensile stress
    19.
    发明授权
    Apparatus for testing the strength of sheets made of hard brittle material under tensile stress 有权

    公开(公告)号：US11181453B2

    公开(公告)日：2021-11-23

    申请号：US16740564

    申请日：2020-01-13

    Applicant: SCHOTT AG

    Inventor： Martin Lotze ,  Thomas Roßmeier ,  Clemens Ottermann ,  Volker Seibert

    IPC: G01N3/16 ,  G01N3/20 ,  G01N33/38

    Abstract: A method for testing the strength of a sheet-like element having two opposite faces and made of hard brittle material under tensile stress is provided. The method includes passing each of the faces of the element over a roller and thereby bending the element so that each of the faces is subjected to a first tensile stress in a portion in which the opposite face is in contact with a surface of the roller; exerting a second tensile force on the element in the direction of advancement so that both faces are subjected to the second tensile stress of at least 2 MPa so that the first and second tensile stresses add up to define a resultant tensile stress; and monitoring the element and determining whether the element has a defined breaking strength equal to the resultant tensile stress or whether the element breaks under the resultant tensile stress.

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