Fiber-optic reed switch

Details Fiber-optic reed switch Fiber-optic reed switch

1988-01-20

1989-08-29

Shaw, Clifford C.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Vacuum or hermetically sealed type

350 9620, 250229, H01H 166

Patent

active

048621242

ABSTRACT:
A magnetically responsive reed switch assembly having one or two cantilevered reed members arranged to close and open a gap responsive to respective levels of magnetic exposure, supports two optical fiber members in end-to-end closely spaced confrontation with the common axis alignment or misalignment of the fibers being a function of the relative closed or opened gap condition. A convenient method of fabrication involves mounting opposing cantilevered reed members on a substrate which is bent to bring the reed members closer together longitudinally. While so bent, a gap closing magnetic field is generated and a continuous length of optical fiber is bonded to the flat aligned surfaces of the reed assembly. The fiber is scored, broken at scoring, and stress and magnetic field is relieved, whereupon fiber ends shift laterally to produce open circuit condition.

REFERENCES:
patent: 4146856 (1979-03-01), Jaeschke
patent: 4189206 (1980-02-01), Terai et al.

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