Optical waveguides – Integrated optical circuit
Patent
1991-07-29
1992-09-22
Lee, John D.
Optical waveguides
Integrated optical circuit
385 39, G02B 612
Patent
active
051504383
ABSTRACT:
A technique for encapsulating an optocoupler apparatus to improve light coupling efficiency, reliability and cost. An optocoupler apparatus comprises a light emitting device (10) and a light detecting device (11) mounted to conductors (12A,12B). A light coupling material (14) surrounds the optocoupler apparatus. The light coupling material (14) is an electrical dielectric which is transparent to light. A portion of the light coupling material (14) is coated with a light reflective material (16). The light reflective material (16) is a mixture of the light coupling material (14) and titanium dioxide. The benefit of coating the light coupling material (14) with the light reflective material (16) is the two materials have similar chemical properties, and the reflective property of the light reflective material (16) arises from the titanium dioxide; the second most reflective material available. An encapsulating material (17 or 19) further envelops the encased optocoupler apparatus.
REFERENCES:
patent: 4218260 (1980-08-01), Metzler
patent: 4244492 (1981-01-01), Beyerstedt et al.
patent: 4272594 (1981-06-01), George et al.
patent: 4472020 (1984-09-01), Evanchuk
patent: 4870279 (1989-09-01), Cueman et al.
patent: 4901329 (1990-02-01), Leas
Barbee Joe E.
Lee John D.
Motorola Inc.
Ngo John
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