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US 8,896,802 B2Granted
Light transmissive substrate, method of making transmissive substrate, surface light source unit, polarizing plate, and liquid crystal device
AssigneeFUJIFILM Corporation
InventorsHiroyuki Yoneyama, Yasuyuki Sasada, Yujiro Yanai
Life of this patent
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Abstract
A surface light source unit includes, in the following order: a light source; a light collecting sheet having light collection portions on at least one side of the light collecting sheet; and a light transmissive substrate having a flat portion and recesses on at least one side of the light transmissive substrate.
Claims6
A method for producing a light transmissive substrate having a flat portion and recesses on at least one side of the substrate, comprising:
- making a light transmissive substrate having a flat portion and recesses on at least one side of the substrate;
- and
- forming a layer containing at least a slip agent on the side of the substrate with the recesses,
- the making of a light transmissive substrate comprising:
- casting a polymer solution containing at least a thermoplastic resin and a solvent on a support to form a web, stripping the web from the support and drying the web,
- the polymer solution containing two or more solvents at least one of which has a dielectric constant of 35 or higher, and
- with phase separation between the thermoplastic resin and the at least one solvent having a dielectric constant of 35 or higher in the solution during film formation or while the solvents evaporate after the film formation.
4 more elements
Dependencies are inferred from the claim text.