公开(公告)号：US20230384490A1

公开(公告)日：2023-11-30

申请号：US18030914

申请日：2021-12-14

Applicant: DEXERIALS CORPORATION

Inventor： Mitsuo ARIMA ,  Masayuki ISHIWATA ,  Kazuhiko NODA ,  Shunsuke KANASUGI

IPC: G02B5/02

CPC classification number: G02B5/0215 ,  G02B5/0278

Abstract: Spectral noise produced by a diffraction phenomenon of a periodic structure can be reduced to improve homogeneity of intensity of straight diffusion light, and noise of zero-order diffraction light is reduced to improve light distribution properties as well. A diffusion plate 1 of a microlens array type that emits straight diffusion light includes a base material 10, and a plurality of cylindrical lenses 21 arranged in an X direction on an X-Y plane of the base material 10 and composed of elongated convex portions or elongated concave portions extending in a Y direction. An aperture width D and a radius of curvature R in the X direction of each of the cylindrical lenses 21 are randomly varied within variation ranges defined by variation full width rates δD and δR, respectively, using a reference aperture width Dk and a reference radius of curvature Rk as references, and an off-center amount Ec of each of the cylindrical lenses 21 is randomly vaned within a variation range defined by a variation full width rate δEc, where δD, δR, and δEc satisfy Expression (1), and at least either δD or δR is not 0%.

公开(公告)号：US20240077658A1

公开(公告)日：2024-03-07

申请号：US17766950

申请日：2020-10-22

Applicant: DEXERIALS CORPORATION

Inventor： Mitsuo ARIMA ,  Masayuki ISHIWATA ,  Shunsuke KANASUGI

IPC: G02B5/02 ,  G02B3/06

CPC classification number: G02B5/0263 ,  G02B3/06 ,  G02B5/0294

Abstract: To reduce unevenness in a luminance distribution in two directions of microlenses disposed in a form of a rectangular grid to improve uniformity of light distribution. Provided is a diffuser plate of a microlens array type including a base material, and a microlens array composed of a plurality of microlenses disposed on an X-Y plane on at least one surface of the base material using a rectangular grid as a reference, in which grid intervals Wx in an X direction of the microlenses disposed in the X direction of the rectangular grid are different from each other, grid intervals Wy in a Y direction of the microlenses disposed in the Y direction of the rectangular grid are different from each other, and surface shapes of the plurality of microlenses are different from each other.