Patent ID: 9746588
Date: 2017-08-29
CPC Classifications: B29C,B29D,G02B,G02F,Y10T

Claim:
1. A method for manufacturing a visibility improvement sheet comprising light transparent portions juxtaposed to each other at predetermined intervals, and light absorbing portions having a substantially rectangular cross section juxtaposed to each other between the light transparent portions, the method comprising: forming light transparent portions juxtaposed to each other at predetermined intervals to form grooves having a substantially rectangular cross section juxtaposed to each other between the light transparent portions; filling the grooves with an ink composition comprising a transparent ionizing radiation curable resin composition and colored fine particles to disperse fine air bubbles randomly in the ink composition; and curing the ink composition with the fine air bubbles randomly dispersed therein to form the light absorbing portions; wherein a width of an opening of the groove is 8 to 12 μm, and wherein the light absorbing portions having a substantially rectangular cross section have an oblique side that makes an angle of 0 to 3 degrees with a direction normal to a surface of the visibility improvement sheet.