A hand-held input device provides a directional force feedback that acts
on a housing of the device. The input device includes a threaded shaft
that is rotatably driven by an electric motor. The motor causes a mass to
move in response to a control signal received from a host computing
device, such as personal computer that is executing a game or simulation.
When the mass is rapidly accelerated or abruptly stopped in response to
the control signal, the change in momentum of the mass imparts a
directional reactive force to the housing, and an operator holding the
housing feels the haptic force.