Focussing apparatus

Details Focussing apparatus Focussing apparatus

H - Electricity

04

R

349/80

H04R 7/12 (2006.01)

Patent

CA 1223658

ABSTRACT A focussing apparatus essentially comprises a truncated outer cone and a coaxial inner cone which between them define a narrow annular passageway through which signals can be transmitted from and to a transducer. The arrangement tends to create a substantially parallel beam of radiation and the focussing apparatus has very good directional characteristics. The transducer is mounted on a pillar within a transducer housing collar resulting in a very compact design. The inner cone is held in place by a number of radiating ribs so that the apex of the cone lies on the plane of truncation of the truncated cone.

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