METHOD AND APPARATUS FOR A TOUCH AND NUDGE INTERFACE
An apparatus can include an apparatus housing, a substantially planar touch surface coupled to the apparatus housing, and a plurality of oblique sensors coupled to the touch surface. Each oblique sensor of the plurality of oblique sensors can have a sensor surface substantially oblique to the touch surface. The plurality of oblique sensors can detect a touch force parallel to the touch surface.
1 . An apparatus comprising:
an apparatus housing;
a substantially planar touch surface coupled to the apparatus housing; and
a plurality of oblique sensors coupled to the touch surface, each oblique sensor of the plurality of oblique sensors having a sensor surface substantially oblique to the touch surface, the plurality of oblique sensors configured to detect a touch force parallel to the touch surface.
2 . The apparatus according to claim 1 , further comprising a controller coupled to the plurality of oblique sensors, the controller configured to determine a contact force based on forces on the plurality of oblique sensors.
3 . The apparatus according to claim 1 , further comprising a controller coupled to the plurality of oblique sensors, the controller configured to determine a contact force based on a ratio of forces on the plurality of oblique sensors.
4 . The apparatus according to claim 2 , wherein the controller is configured to determine a planar force component of the contact force based on a ratio of forces on the plurality of oblique sensors and a normal force on the touch surface, the planar force being parallel to the touch surface.
5 . The apparatus according to claim 2 , wherein the controller is configured to determine a normal force component of the contact force based on a combination of forces on the plurality of oblique sensors and a normal force on the touch surface, the normal force being normal to the touch surface.
6 . The apparatus according to claim 2 , wherein the controller is configured to determine a planar force component of the contact force based on a difference between forces on the plurality of oblique sensors.
7 . The apparatus according to claim 2 ,
wherein each oblique sensor has a sensor surface substantially non-parallel and non-orthogonal to the touch surface,
wherein each oblique sensor outputs a sensor signal in response to a user input, and
wherein the controller receives the sensor signals and determines vector components of the user input, the vector components lying in an axis normal to the touch surface and parallel to the touch surface.
8 . The apparatus according to claim 2 , wherein the controller is configured to translate a force vector applied to a substantially constant position on the touch surface into a sensed vector direction.
9 . The apparatus according to claim 1 , wherein the plurality of oblique sensors comprises a first oblique sensor having a first oblique sensor surface substantially non-parallel to the touch surface facing in a first direction and a second oblique sensor having a second oblique sensor surface substantially non-parallel to the touch surface facing in a second direction perpendicular to the first direction.
10 . The apparatus according to claim 1 , wherein the plurality of oblique sensors comprises a first oblique sensor having a first oblique sensor surface substantially non-parallel to the touch surface facing in a first direction and a second oblique sensor having a second oblique sensor surface substantially non-parallel to the touch surface facing in a second direction with a portion of a projection parallel to the touch surface substantially opposite to the first direction.
11 . The apparatus according to claim 1 , wherein the plurality of oblique sensors are configured to sense a force on the touch surface perpendicular to the touch surface and a force on the touch surface parallel to the touch surface.
12 . The apparatus according to claim 1 , wherein the touch surface comprises a deformable touch surface.
13 . The apparatus according to claim 1 , wherein the touch surface comprises a rigid surface suspendably coupled to the apparatus housing.
14 . The apparatus according to claim 1 , wherein an oblique sensor comprises one of a piezoelectric sensor, a capacitive sensor, and a resistive sensor.
15 . The apparatus according to claim 1 , wherein an oblique sensor comprises a piezoelectric sensor having one of a bendable piezoelectric stack and a compressible piezoelectric stack.
16 . The apparatus according to claim 1 , wherein an oblique sensor comprises a first capacitive plate, a second capacitive plate, and a compressible elastomeric dielectric material positioned between the first capacitive plate and the second capacitive plate.
17 . The apparatus according to claim 1 , wherein an oblique sensor comprises one of a force sensor, a displacement sensor, and a velocity sensor