Wiring board

Abstract

A wiring board includes: thin silver wires formed on a substrate by a printing method, in which the thin silver wires are configured so that the width thereof in a cross-section in a direction perpendicular to a wire length direction thereof is 20 μm or less, a top thereof has a smaller width than that of a contact portion that comes into contact with the substrate, and a volume resistivity of the thin silver wire is 15 μΩ·cm or less.

1 . A wiring board comprising:
 thin silver wires formed on a substrate by a printing method,   wherein a width of the thin silver wire in a cross-section in a direction perpendicular to a wire length direction thereof is 20 μm or less, and a top thereof has a smaller width than that of a contact portion that comes into contact with the substrate, and   a volume resistivity of the thin silver wire is 15 μΩ·cm or less.   
     
     
         2 . The wiring board according to  claim 1 ,
 wherein an aspect ratio of the thin silver wire in the cross-section in the direction perpendicular to the wire length direction thereof is 0.1 or less.   
     
     
         3 . The wiring board according to  claim 1 ,
 wherein a difference in light transmittance between the wiring board and the substrate which is not provided with the thin silver wires is 15% or less in terms of light having the same wavelength.   
     
     
         4 . The wiring board according to  claim 1 ,
 wherein a thickness of the substrate is 0.5 μm to 5000 μm.   
     
     
         5 . The wiring board according to  claim 1 ,
 wherein a pitch between the thin silver wires is 50 μm to 320 μm.   
     
     
         6 . The wiring board according to  claim 1 ,
 wherein a pattern in which a plurality of the thin silver wires intersect is provided as a pattern of the thin silver wires.   
     
     
         7 . The wiring board according to  claim 1 ,
 wherein the thin silver wires are formed by using a silver ink composition, and   the silver ink composition is produced by mixing a silver carboxylate, and a nitrogen-containing compound, with either or both of a reducing agent and an alcohol.