Method for producing glass sheet with bent portion and glass sheet with bent portion

Abstract

Provided is a method capable of producing a glass sheet with a bent portion in which a flattened portion has high flatness and high smoothness. A flat glass sheet 20 is radiationally heated with a first portion 21 thereof held between first and second heat-insulating members 31, 32. And then, a second portion 22 a, 22 b of the flat glass sheet 20 not held between the first and second heat-insulating members 31, 32 is bent.

1 . A glass sheet with a bent portion, the glass sheet comprising:
 a flattened portion substantially in in the shape of a flat sheet; and   a bent portion continued to an end region of the flattened portion in a transverse direction thereof,   wherein when viewed in cross section along a thickness direction of the glass sheet, no gap is created between an imaginary line tangent to a back surface of a middle region of the flattened portion in the transverse direction and the end region of the flattened portion in the transverse direction.   
     
     
         2 . The glass sheet with a bent portion according to  claim 1 , wherein front and back surfaces of the flattened portion are unground surfaces. 
     
     
         3 . The glass sheet with a bent portion according to  claim 1 , wherein a front surface of the end region of the flattened portion in the transverse direction is flush with a front surface of the middle region of the flattened portion in the transverse direction. 
     
     
         4 . The glass sheet with a bent portion according to  claim 1 , wherein the end region of the flattened portion in the transverse direction is provided to extend along a direction inclined toward a bent-away side of the bent portion relative to a direction of extension of the middle portion of the flattened portion in the transverse direction. 
     
     
         5 . The glass sheet with a bent portion according to  claim 1 , wherein the back surface of the flattened portion is formed of a curved surface having a radius of curvature of 1000 mm or more. 
     
     
         6 . The glass sheet with a bent portion according to  claim 1 , further comprising a flange continued to an opposite end of the bent portion to the flattened portion and having a shape of a substantially flat sheet,
 wherein the angle formed between a direction of extension of a back surface of the flange and a direction of extension of a back surface of the end region of the flattened portion in the transverse direction is larger than 90°.