06259058 is referenced by 73 patents and cites 54 patents.

An apparatus for physically separating non-metallic substrates by forming a microcrack in the substrate and controlling propagating the microcrack. An initial mechanical or pulsed laser scribing device forms a microcrack in the substrate. If a pulsed laser is used, it forms a crack in the substrate between its top and bottom surf. A scribe beam is applied onto the substrate on a separation line. A helium coolant stream intersets with, or is adjacent to, the trailing edge of the scribe beam. The temperature differential between the heat affected zone of the substrate and the coolant stream propagates the microcrack. Two breaking beams on opposing sides of the separation line follow the coolant stream. The breaking beams create controlled tensile forces that extend the crack to the bottom surface of the substrate for full separation. The scribe and break beams and coolant stream are simultaneously moved relative to the substrate. A preheat beam preheats the heat affected area on the substrate. The beams are formed by an arrangement of lases and mirrors and lenses. A movable mirror selectively diverts a beam to form either the preheat beam or one or more of the break and scribe beams. Spherical aberration is introduced in the break and scribe beams to flatten their energy distribution profiles and evenly apply the beam energy. A supplement a mechanical force, applied by vertically movable wheels or by restraining the substrate against a curved frame, creates a bending moment to facilitate the separation process.

Apparatus for separating non-metallic substrates
Application Number
Publication Number
6259058 (B1)
Application Date
January 29, 1999
Publication Date
July 10, 2001
Brian L Hoekstra
Banner & Witcoff
Accudyne Display and Semiconductor Systems
B23K 26/067
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