Electronic controller with finger sensing and an adjustable hand retainer

A controller for an electronic system, for operation by a user having a hand with a thumb, fingers, a purlicue between the thumb and the fingers, and a palm, the controller comprising:

• a controller body having a head and a handle, the head adjoining the handle at a neck region, the head including at least one thumb-operated control;
• a tracking member that is fixed to the controller body;
• a hand retainer that in a closed position is configured to physically bias the user's palm against an outer surface of the handle, the hand retainer including a resilient member that biases the hand retainer towards an open position, the resilient member being adjustably attached to the head by a first adjustment mechanism that permits the resilient member to be adjusted towards or away from the user's purlicue;
• a first plurality of tracking transducers disposed in the tracking member, the first plurality of tracking transducers being coupled with the electronic system via electromagnetic radiation;
• and
• an array of proximity sensors that are spatially distributed on the handle, the array of proximity sensors being responsive to a proximity of the user's fingers to the outer surface of the handle.