Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1992-02-18
1994-08-30
Brown, Theatrice
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
A63C 1906
Patent
active
053420420
ABSTRACT:
An arrangement to determine whether a tennis ball is "in" or "out" on a playing surface, which includes both a transmit coil and a receive coil beneath the playing surface and a modified tennis ball to have a non-zero magnetic permeability, so that an alternating signal can be transmitted from the transmit coil and re-radiated from the tennis ball, which can then be detected by the receive coils, and can be synchronously demodulated and resistive and reactive components of the signal analysed to discriminate the ball from other influences. The receive coils can be wound to avoid electro-magnetic interference from far fields.
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Engineering Circuit Analysis, 1978. Located in Art Unit 3304 Library of Jessica Harris.
Baxter John R.
Candy Bruce H.
Brown Theatrice
Caldone Pty. Limited
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