Title:
PRISM SHEET AND ILLUMINATION DEVICE USING SAME
Document Type and Number:
WIPO Patent Application WO/2021/210246
Kind Code:
A1
Abstract:
To realize a prism sheet that has a cylindrical external form and that has a concentric circular prism array. A prism sheet 15 which has a cylindrical external form and in which a concentric circular prism array is formed on one surface thereof, the prism sheet 15 being characterized in that a groove 51 is formed leading in the radial direction from the center of the prism array so as to intersect with the concentric circles. When the prism array is transferred to the prism sheet 15 using a transfer roller, entrained air is discharged through the groove 51.
Inventors:
HASEGAWA MAKOTO (JP)
SUZUKI NOBUYUKI (JP)
SUZUKI NOBUYUKI (JP)
Application Number:
PCT/JP2021/003742
Publication Date:
October 21, 2021
Filing Date:
February 02, 2021
Export Citation:
Assignee:
JAPAN DISPLAY INC (JP)
International Classes:
G02B5/04; F21S2/00; F21V5/02
Domestic Patent References:
| WO2009128885A1 | 2009-10-22 |
Foreign References:
| US20160146427A1 | 2016-05-26 | |||
| JPS62153709U | 1987-09-29 | |||
| JP2015072335A | 2015-04-16 | |||
| JP2004191718A | 2004-07-08 |
Attorney, Agent or Firm:
POLAIRE I.P.C. (JP)
Download PDF: