METHOD OF AND APPARATUS FOR DIVIDING PLATE MEMBER MADE OF BRITTLE MATERIAL
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United States of America Patent
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Jun 2, 2016
app pub date -
May 22, 2014
filing date -
Jul 8, 2013
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Abstract
A method of dividing a plate member made of a brittle material includes; first, forming a minute start point flaw 16 in a first main surface of a plate member on a division-planned line; then holding the first main surface of the plate member on a pair of lines; and thereafter, for example, bringing a dividing member, which heats up a second main surface of the plate member by contact heating, into contact with the second main surface of the plate member to generate a tensile thermal stress on the first main surface and applying bending force in a thickness direction of the plate member to the second main surface of the plate member, such that a tensile stress derived from the bending force and the tensile thermal stress are combined together. In this manner, the plate member is divided along the division-planned line.
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