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    • 5. 发明公开
    • OPTICAL MEMBER, DISPLAY DEVICE, AND LIGHTING DEVICE
    • EP3617755A1
    • 2020-03-04
    • EP18791436.1
    • 2018-02-13
    • Sony Corporation
    • FURUKAWA, NorimasaNAKAKI, Kenichi
    • G02B5/02F21S2/00F21V5/00F21V5/02G02F1/1335F21Y115/10
    • An optical member is provided that achieves a desired light distribution characteristic with a simple configuration. The optical member extends along a first plane and has a thickness in a first direction perpendicular to the first plane. The optical member includes n-number of inclined surfaces. The n-number of inclined surfaces include first to n-th inclined surfaces. The first to n-th inclined surfaces are positioned in respective regions other than regions overlapping each other in the first direction. The first to n-th inclined surfaces are each inclined at an angle A m with respect to the first plane and allow entering light to pass therethrough. The angle A m is smaller than 90 degrees. The following conditional expression (1) and the following conditional expression (2) are satisfied, WA ≥ A m − A m − 1 A n > A n − 1 ⋯ > A m > A m − 1 > ⋯ A 2 > A 1 where "WA" is an angle corresponding to a value equal to or smaller than a half-width of a light distribution of the entering light, "A m " is an angle of an m-th inclined surface with respect to the first plane, "A m-1 " is an angle of an (m-1)-th inclined surface with respect to the first plane, "n" is a natural number that is equal to or greater than 2, and "m" is any natural number that is equal to or smaller than "n."