Patent ID: 6023039
Filing Date: 2000-02-08
Classification: B23K,C03B,Y10T

Abstract:
A method of determining an optimum distance ""D"" of a center position of a beam spot of a pulse laser point heat source irradiated on a strip from a tip of a crack of said strip, said pulse laser point heat source having a pulse time ""t"", for the purpose of cleaving said strip by tensile stress applied by said pulse laser point heat source,wherein said method comprises the steps of:selecting ""t"" to find a value of 4.kappa.t/W.sup.2 where "".kappa."" is a thermal diffusivity of said strip, ""W"" is a width defined as a distance between a cleaving-intended line and a side edge of said strip; andfinding an optimum value of D/W from said value of 4.kappa.t/W.sup.2 with reference to a previously obtained relationship between said optimum value of D/W and said value of 4.kappa.t/W.sup.2 thereby to find said optimum distance ""D"".