Optical isolator

Details Optical isolator Optical isolator

1987-07-21

1989-09-05

Zimmerman, John J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having marginal feature for indexing or weakened portion for...

428577, 428596, 357 70, H01L 2348, H01L 3116

Patent

active

048638064

ABSTRACT:
An optical isolator is fabricated upon a lead frame having an LED section which is rotated 180.degree. to position the LED over the photodiode. Prior to rotation both the LED and the photodiode attachment portions of the leads are down set a predetermined amount to fix the size of the isolation gap between the LED and the photodiode. Dielectric sheets are attached to the outer surfaces of the LED and photodiode leads and an optically transmissive resin is injected therebetween to form a light guide and to encapsulate the LED and photodiode dice and their associated bond wires. In an alternate embodiment a sheet is attached to the outer surface of one lead and a dielectric sheet thereagainst is positioned at a tilted angle between the LED and the photodiode.

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patent: 4322628 (1982-03-01), Tanaka
patent: 4446375 (1984-05-01), Aird
patent: 4633582 (1987-01-01), Ching et al.
patent: 4791473 (1988-12-01), Phy

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