Amusement devices: games – Including means for processing electronic data – Player-actuated control structure
Patent
1997-10-23
1999-06-15
O'Neill, Michael
Amusement devices: games
Including means for processing electronic data
Player-actuated control structure
273148B, A63F 922
Patent
active
059116277
ABSTRACT:
A joystick having an electromagnetic element coupled to a movable stick, with at least a pair of orthogonal coils on an underlying substrate. Alternately, the coils and electromagnetic elements can be reversed. The movement of the stick is detected by the amount of overlap of the electromagnetic element and the coils in each direction. The quality factor of the coil changes as more or less of the coil is overlapped, which can be measured by an electric circuit to determine the direction of movement and the amount of movement of the joystick. The electromagnetic element could be, for instance, a conductive steel plate, or a piece of another metal or of another conductive material, or ferrite particles. The coil could be wound (preferably on air only or, if needed to reach a higher value of inductance, on a magnetic core, provided this is small enough to not hide the effect of the mobile electromagnetic element). Or the coils could be made from traces on a printed circuit board (PCB), provided the use of a high enough (greater than 1 MHz) driving frequency, eliminating the need for a large, expensive wound coil.
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Bidiville Marc
Favre Patrick
Kehlstadt Florian
Merminod Antoine
Piot Julien
Logitech Inc.
O'Neill Michael
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