Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1977-12-23
1980-01-15
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250551, H01J 3112
Patent
active
041840704
ABSTRACT:
A connector assembly comprises a lead frame mounting one or more semiconductor chips, having optically active areas, a fiber guide and optical fibers held in optical communication with the chips. The fiber guide is formed of a plate-like member having two or more reference points, in order to precisely locate the fibers relative to the chip. Several embodiments of the guide are shown including a plate having fiber-receiving bores extending therethrough as well as a plate having fiber-receiving grooves extending along sides thereof preferably used in conjunction with a bar biased against fibers disposed in the grooves. The bar is shown having a straight edge facing the grooves while a variation of the bar is provided with an additional set of grooves. Either the bar, its respective plate or both may be made of elastomeric material to allow for variations in fiber diameter. The lead frame mounts a relatively large thermal and electrically conductive pad which in turn mounts the semiconductor chip having optically active areas. Fibers are trained through respective bores or grooves and epoxied in alignment with respective optically active areas. The connector is adapted to be mounted on one side of a backplane while the electronic components such as drivers and amplifiers, associated with matching electrical characteristics of transmitting and receiving circuitry to those of the photo emitting and detecting elements of the chip are mounted on a second side of the back plane. A single connector may contain either or both photo emitting and photo detecting elements.
REFERENCES:
patent: 3963920 (1976-06-01), Palmer
Stigliani, "Digital Design", May 1976, pp. 48, 50, 52.
Crow, "Optics Letters", Jul. 1977.
Bulletin entitled "An Introduction to Communication Fiberglass Design", prepared by Valter Corp. dated 1977.
Haug John A.
Hostetter Darwin R.
McAndrews James P.
Nelms David C.
Texas Instruments Incorporated
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