Title:
DIFFUSION PLATE
Document Type and Number:
WIPO Patent Application WO/2020/153319
Kind Code:
A1
Abstract:
Provided is a diffusion plate that enables further improvement of brightness unevenness and color unevenness while speckle noise of transmitted light or reflected light is suppressed. A transmission-type or reflection-type diffusion plate (100) is characterized in that: a×b two-dimensional basic cycle structures (10) each having an optical element with an effective diameter of a in an X-axis direction and an effective diameter of b in a Y-axis direction are constituted on a flat plate-like base material (51); the basic cycle structures have Na×Mb two-dimensional cycle phase structures in each of which a basic block is defined by N rows by M columns that include the N optical elements (53) in the X-axis direction and include the M optical elements in the Y-axis direction; and, when Pn1+P1m represents a phase structure Pnm in the n-th row and m-th column in the basic block and the square of an absolute value in Fourier transform of a complex transmittance or a complex reflectance of the optical element in the n-th row and m-th column in the basic block represents directivity characteristics, the ratio of a standard deviation with respect to the average of the directivity characteristics is not more than 0.3.
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Inventors:
IKEDA KEISUKE (JP)
UCHIDA ATSUSHI (JP)
KARAI MASARU (JP)
UCHIDA ATSUSHI (JP)
KARAI MASARU (JP)
Application Number:
PCT/JP2020/001825
Publication Date:
July 30, 2020
Filing Date:
January 21, 2020
Export Citation:
Assignee:
KURARAY CO (JP)
International Classes:
G02B5/02; G02B3/00; G02B27/01; G02B27/48; G03B21/62
Domestic Patent References:
WO2016139769A1 | 2016-09-09 | |||
WO2016051766A1 | 2016-04-07 | |||
WO2016143350A1 | 2016-09-15 | |||
WO2019163678A1 | 2019-08-29 |
Foreign References:
JP2017122773A | 2017-07-13 | |||
JPH04119339A | 1992-04-20 | |||
JP2015034877A | 2015-02-19 | |||
JP2010145745A | 2010-07-01 | |||
JP2004505306A | 2003-05-16 | |||
JP2017122773A | 2017-07-13 | |||
JP2019011212A | 2019-01-24 |
Other References:
See also references of EP 3916436A4
Attorney, Agent or Firm:
IEIRI Takeshi (JP)
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