Optical member, method for manufacturing optical member, and optical film of optical member

Abstract

An optical member includes a laminated body configured to reduce light reflection disposed on a substrate, wherein a surface of the laminated body is a porous layer or a layer having a textured structure, and at least one layer of the laminated body is a polymer layer containing a linear polymer and a branched polymer. A method for manufacturing the optical member is also provided. The branched polymer content is 10% by weight or more and 90% by weight or less of the total weight of the linear polymer and the branched polymer. The layer having a textured structure contains crystals mainly composed of aluminum oxide.

What is claimed is: 
     
         1 . An optical member including a laminated body configured to reduce light reflection disposed on a substrate, wherein a surface of the laminated body is a porous layer or a layer having a textured structure, and at least one layer of the laminated body is a polymer layer containing a linear polymer and a branched polymer. 
     
     
         2 . The optical member according to  claim 1 , wherein the branched polymer has a structure represented by the following general formula (1): 
       
         
           
           
               
               
           
         
         wherein R1 and R2 independently denote a divalent organic group having an aromatic ring or a heterocycle, and n is an integer of 3 or more. 
       
     
     
         3 . The optical member according to  claim 1 , wherein the branched polymer has a refractive index of 1.7 or more and less than 2.0. 
     
     
         4 . The optical member according to  claim 1 , wherein the difference in refractive index between the linear polymer and the branched polymer is 0.04 or more and 0.4 or less. 
     
     
         5 . The optical member according to  claim 1 , wherein the linear polymer has a lower refractive index than the branched polymer. 
     
     
         6 . The optical member according to  claim 1 , wherein the branched polymer content is 10% by weight or more and 90% by weight or less of the total weight of the linear polymer and the branched polymer. 
     
     
         7 . The optical member according to  claim 1 , wherein the layer having a textured structure contains aluminum oxide crystals. 
     
     
         8 . The optical member according to  claim 1 , wherein the linear polymer has an aromatic ring and/or an imide ring in its main chain. 
     
     
         9 . The optical member according to  claim 8 , wherein the linear polymer is selected from the group consisting of polyimides and polycarbonates. 
     
     
         10 . The optical member according to  claim 1 , wherein the layer having a textured structure has a nano structure of a material containing a metal oxide or a metallic compound and has an apparent refractive index that changes in the thickness direction of the layer, the apparent refractive index being lower than the intrinsic refractive index of the material. 
     
     
         11 . A method for manufacturing an optical member including a laminated body configured to reduce light reflection disposed on a substrate, comprising:
 1) applying a polymer solution of a linear polymer and a branched polymer to a substrate or a thin film disposed on the substrate;   2) heating the applied polymer solution at 23° C. or more and 250° C. or less to form a polymer layer containing a mixture of the linear polymer and the branched polymer; and   3) forming a porous layer or a layer having a textured structure on the polymer layer.   
     
     
         12 . The method for manufacturing an optical member according to  claim 11 , wherein the forming of the layer having a textured structure includes
 4) forming a layer mainly composed of aluminum oxide; and   5) immersing the layer mainly composed of aluminum oxide in hot water to precipitate crystals mainly composed of aluminum oxide.   
     
     
         13 . The method for manufacturing an optical member according to  claim 11 , wherein the branched polymer has a refractive index of 1.7 or more and less than 2.0. 
     
     
         14 . The method for manufacturing an optical member according to  claim 11 , wherein the difference in refractive index between the linear polymer and the branched polymer is 0.04 or more and 0.4 or less. 
     
     
         15 . The method for manufacturing an optical member according to  claim 11 , wherein the linear polymer has a lower refractive index than the branched polymer. 
     
     
         16 . An optical film of an optical member, wherein the optical member includes a laminated body on a substrate, a surface of the laminated body including a porous layer or a layer having a textured structure, and the optical film is used in at least one layer of the laminated body and includes a polymer layer containing a linear polymer and a branched polymer. 
     
     
         17 . The optical film of an optical member according to  claim 16 , wherein the branched polymer has a structure represented by the following general formula (1): 
       
         
           
           
               
               
           
         
         wherein R1 and R2 independently denote a divalent organic group having an aromatic ring or a heterocycle, and 
         n is an integer of 3 or more. 
       
     
     
         18 . The optical film of an optical member according to  claim 16 , wherein the branched polymer has a refractive index of 1.7 or more and less than 2.0. 
     
     
         19 . The optical film of an optical member according to  claim 16 , wherein the difference in refractive index between the linear polymer and the branched polymer is 0.04 or more and 0.4 or less. 
     
     
         20 . The optical film of an optical member according to  claim 16 , wherein the linear polymer has a lower refractive index than the branched polymer. 
     
     
         21 . The optical film of an optical member according to  claim 16 , wherein the branched polymer content is 10% by weight or more and 90% by weight or less of the total weight of the linear polymer and the branched polymer.