Glass manufacturing – Processes – Fusion bonding of glass to a formed part
Patent
1994-06-17
1996-11-12
Simmons, David A.
Glass manufacturing
Processes
Fusion bonding of glass to a formed part
65 594, 156 89, 1563096, 102201, C03C 2702, B23B 3126
Patent
active
055735657
ABSTRACT:
In the fabrication of igniters, actuators, detonators, and other pyrotechnic devices to be activated by a laser beam, an integral optical glass window is formed by placing a preform in the structural member of the device and then melting the glass and sealing it in place by heating at a temperature between the ceramming temperature of the glass and the melting point of the metal, followed by rapid furnace cooling to avoid devitrification. No other sealing material is needed to achieve hermeticity. A preferred embodiment of this type of device is fabricated by allowing the molten glass to flow further and form a plano-convex lens integral with and at the bottom of the window. The lens functions to decrease the beam divergence caused by refraction of the laser light passing through the window when the device is fired by means of a laser beam.
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Dalton Rick D.
Kramer Daniel P.
Massey Richard T.
Waker Damon A.
Chafin James H.
Mayes M. Curtis
McMillan Armand
Moser William R.
Simmons David A.
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