Patent ID: 9212080
Filing Date: 2015-12-15
Classification: B26F,B32B,C03B,Y10T

Abstract:
1. A glass film cleaving method, comprising: manufacturing a glass film laminate by setting respective surface roughnesses Ra of a surface of a glass film and a surface of a support glass which is configured to support the glass film to 2.0 nm or less, and by bringing the surface of the glass film and the surface of the support glass into surface contact with each other; and cleaving a full-body of the glass film by propagating an initial crack along a preset cleaving line through laser heating of the glass film followed by subsequent cooling of the glass film; wherein the glass film has a thickness of 200 μm or less, wherein the cleaving of the full-body of the glass film occurs while the surface of the glass film and the surface of the support glass are in surface contact with each other, and wherein, in cleaving the full-body of the glass film, the glass film has a first preset cleaving line extending in a first direction and a second preset cleaving line extending in a second direction orthogonal to the first direction; and the glass film is subjected to a first full-body cleaving step along the first preset cleaving line without forming any scribe line, and thereafter the glass film is subjected to a second full-body cleaving step along the second preset cleaving line across a cleaved portion of each of a plurality of glass films cleaved in the first full-body cleaving step without forming any scribe line in a state in which the initial crack is formed only at one of a plurality of end portions of the second preset cleaving line.