Title:
PRISM SHEET, OPTICAL UNIT, AND DIRECT-DOWNWARD BACKLIGHT UNIT
Document Type and Number:
Japanese Patent JP2021089389
Kind Code:
A
Abstract:
To provide a prism sheet that can suppress generation of a hot spot.SOLUTION: The prism sheet includes: a first ridge line having a prism layer with a plurality of unit prisms lining in an X-axis direction and in a Y-axis direction perpendicular to each other, the unit prisms having a shape in a regular square or in a rectangular with two parallel sides in the X-axis direction and with two parallel sides in the Y-axis direction in a planer view, and the unit prisms extending in the Y-axis direction in the center position in the X-axis direction; and a second ridge line extending in the X-axis direction in the center position in the Y-axis direction. The apex angle of the unit prisms in the X-axis direction and in the Y-axis direction is in the range between 50° to 145°, both inclusive.SELECTED DRAWING: Figure 1
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Inventors:
MIZUGUCHI TAKUYA
Application Number:
JP2019220650A
Publication Date:
June 10, 2021
Filing Date:
December 05, 2019
Export Citation:
Assignee:
KEIWA INC
International Classes:
G02B5/02; F21S2/00; F21V3/00; F21V5/00; F21V5/02; G02B5/04; G02F1/13357
Attorney, Agent or Firm:
Hajime Amano
Yoshinori Ikeda
Koji Ishida
Matsuura Masako
Yoshinori Ikeda
Koji Ishida
Matsuura Masako