Electronic device housing with integrated user input capability
An electronic device housing with a seemless user input zone that measures the level of force applied by the user is described. It is particularly advantageous when used with small hand-held consumer electronic devices such as mobile phones, PDAs, game- and media players. A housing for an electronic device includes a seamless user input zone defining a contact force-sensitive deformable area. A capacitance sensor is formed between the conductive inside surface of the housing and the electrode of the rigid base facing that inside surface. Linear support means such as columns support the housing away from the rigid base defining an air gap. Capacitance measurement circuit is deployed to detect the location and force applied by the user onto the housing and send a user input signal to the electronic device.
1. A housing for an electronic device with integrated user input capability comprising:
a housing body containing an opening and a deformable user input zone adjacent to said opening, said user input zone having a conductive inside surface as a first conductive layer, said inside surface being supported only on one side away from said opening and therefore suspended in a cantilever fashion away from said opening,
a rigid base spaced apart from said inside surface of the user input zone of the housing at a predetermined gap distance, said base having a second conductive layer facing said first conductive layer,
a capacitance measuring circuit connected to both said first and second conductive layers,
whereby a capacitance sensor is formed between said first and second conductive layers, said sensor is responsive to deformation of the housing towards said rigid base at the user input zone caused by applying force onto said zone, said deformation causing a change in capacitance between said first and said second conductive layers, said change in capacitance being detected by said capacitance measuring circuit and transmitted as a user input signal to said electronic device.
2. The device as in claim 1 , wherein said housing is made from a non-conductive material and said first conductive layer is made by applying a conductive material onto said inside surface.
3. The device as in claim 1 , wherein said second conductive layer having a plurality of buttons, said capacitance measuring curcuitry adapted to detect a location of the user input in addition to said change in capacitance measured at the same location and use both as input signals to said electronic device.
4. The device as in claim 1 further comprising a display module protruding through said opening.