The present invention provides a control knob on a device that allows a
user to control functions of the device. In one embodiment, the knob is
rotatable in a rotary degree of freedom and moveable in at least one
transverse direction approximately perpendicular to the axis. An actuator
is coupled to the knob to output a force in the rotary degree of freedom
about the axis, thus providing force feedback. In a different embodiment,
the knob is provided with force feedback in a rotary degree of freedom
about an axis and is also moveable in a linear degree of freedom
approximately parallel to the axis, allowing the knob to be pushed and/or
pulled by the user. The device controlled by the knob can be a variety of
types of devices, such as an audio device, video device, etc. The device
can also include a display providing an image updated in response to
manipulation of the knob. Detent forces can be provided for the knob by
overlapping and adjusting ranges of closely-spaced detents in the rotary
degree of freedom of the knob.