To provide a glass welding method producible of a glass-welded body having high reliability.
A glass layer 3 is melted by irradiation of a laser beam L, and a temperature difference wherein the temperatures of principal surfaces 40a, 50a on the side of the glass layer 3 become higher than the temperatures of principal surfaces 40b, 50b on the opposite side of the glass layer 3 arises at parts along a planned weld region R at respective glass substrates 40, 50. Then, the molten glass layer 3 solidifies and the cooling causes stress to occur in the glass substrates 40, 50. At this time, since an initial crack 8 is formed in the glass substrate 50 so as to overlap the glass layer 3 when seen from the thickness directions of glass substrates 40, 50, the crack extends across the glass layer 3 in the thickness directions of the glass substrates 40, 50, starting from the initial crack 8. Thus, the glass substrate 40 and the glass substrate 50 can be welded along the planned weld region R and also split apart.
Shiro Terasaki
Satoru Ishida
Kenichi Shibayama