Heating plate, conductive pattern sheet, vehicle, and method of manufacturing heating plate

Abstract

A heating plate includes: a pair of glass plates; a conductive pattern disposed between the pair of glass plates and defining a plurality of opening areas; and a joint layer disposed between the conductive pattern and at least one of the pair of glass plates; wherein the conductive pattern includes a plurality of connection elements that extend between two branch points to define the opening areas; and a rate of the connection elements, which are straight line segments connecting the two branch points, relative to the plurality of connection elements, is less than 20%.

1 . A heating plate comprising:
 a pair of glass plates; and   a conductive pattern disposed between the pair of glass plates;   wherein:   the conductive pattern includes thin conductive wires formed of a patterned copper film and arranged in a mesh pattern; and   a line width of the thin conductive wire is not less than 1 μm and not more than 20 μm.   
     
     
         2 . The heating plate according to  claim 1 , wherein
 the thin conductive wires are arranged in a honeycomb pattern.   
     
     
         3 . The heating plate according to  claim 2 , wherein
 a pitch of adjacent hexagonal openings in the honeycomb pattern is not less than 0.3 mm and not more than 7.0 mm.   
     
     
         4 . The heating plate according to  claim 1 , wherein
 the thin conductive wires are arranged in a grid pattern.   
     
     
         5 . The heating plate according to  claim 4 , wherein
 a pitch of adjacent rectangular openings in the grid pattern is not less than 0.3 mm and not more than 7.0 mm.   
     
     
         6 . The heating plate according to  claim 1 , wherein
 the copper film is an electrolytic copper foil.   
     
     
         7 . A conductive pattern sheet used in a heating plate that generates heat upon application of voltage thereto, the conductive pattern sheet comprising:
 a substrate; and   a conductive pattern disposed on the substrate;   wherein:   the conductive pattern includes thin conductive wires formed of a patterned copper film and arranged in a mesh pattern; and   a line width of the thin conductive wire is not less than 1 μm and not more than 20 μm.   
     
     
         8 . A manufacturing method of a heating plate including a pair of glass plates and a conductive pattern disposed between the pair of glass plates, the manufacturing method comprising:
 laminating a copper film on a substrate; and   forming the conductive pattern including thin conductive wires formed by patterning the copper film;   wherein:   the thin conductive wires are arranged in a mesh pattern; and   a line width of the thin conductive wire is not less than 1 μm and not more than 20 μm.   
     
     
         9 . The manufacturing method according to  claim 7 , wherein
 the copper film is an electrolytic copper foil.