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US 3,938,173 AGranted
Optically coupled semiconductive switching devices
AssigneeInternational Standard Electric Corporation
InventorsThomas M. Jackson, Alan D. Brisbane, Jack R. Peters, Rudolf A. H. Heinecke, David J. Moule
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Abstract
This relates to an optically isolated switching device made by coupling the output of a light emitting diode into a thyristor. Sensitivity is determined by optical flux density rather than total flux. Improved sensitivity is obtained with a mesa construction of a diode mounted on and bonded to a thyristor at a window in its cathode via a glass preform having a high refractive index.
Claims5
An optically coupled semiconductor switching device comprising:
- a light-emitting diode having a mesa construction;
- a triggerable pnpn semiconductor switching structure;
- and a preformed intervening light transmitting dielectric material coupled between said switching structure and said light-emitting diode for providing electrical insulation and optical coupling between said diode and said structure, said preformed intervening light transmitting dielectric material comprising a first mass of dielectric material coated on opposite sides with a layer of a second dielectric material, said second material having a lower melting point than said first mass and providing a bond between said first mass and said diode and between said first mass and said pnpn structure.
Dependencies are inferred from the claim text.