Rotary signal coupler

Details Rotary signal coupler Rotary signal coupler

2005-03-08

2005-03-08

Le, Dinh T. (Department: 2816)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S174000, C333S175000, C333S261000

Reexamination Certificate

active

06864759

ABSTRACT:
A rotary signal coupler for providing signal coupling to a Surface Acoustic Wave (SAW) device (4) mounted on a shaft (5) includes a first electrically conducting loop (21) mounted on a disc (23) and connected to the SAW device (4), and a second electrically conductive loop (22) mounted on a disc (24) and connected to external electronic circuitry. The disc (23) is fixed relative to the shaft (5) and the disc (24) is fixed relative to the structure in which the shaft (5) rotates so that the loops (21, 22) are inductively coupled. A grounded screen (27), which preferably takes the form of a plurality of radially extending fingers is located on the disc (23) and positioned between the loops (21, 22) to eliminate capacitive coupling therebetween.

REFERENCES:
patent: 4089049 (1978-05-01), Suzuki et al.
patent: 4238733 (1980-12-01), Freeman
patent: 4242666 (1980-12-01), Reschovsky et al.
patent: 6018279 (2000-01-01), Arthur
patent: 6478584 (2002-11-01), Vile et al.
patent: 2 328 068 (1999-02-01), None
patent: 2 350 938 (2000-12-01), None

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