Force-based input device

• US 20080170043A1
• Filed: 12/14/2007
• Published: 07/17/2008
• Est. Priority Date: 06/10/2005
• Status: Abandoned Application

• Current Assignee: QSI Incorporated (Quanta Services Incorporated)
• Original Assignee: QSI Incorporated (Quanta Services Incorporated)
• Inventors: Mullins, James R., Elwell, James K., Soss, David A.
• Application Number:
  US12/002,333
• Publication Number:
  US 20080170043A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/04142 the force sensing means being located peripherally, e.g. disposed at the corners or at the side of a touch sensing plate

Abstract

An input device comprising a base support, having a periphery and a plurality of apertures formed therein to define a circumscribed or circumscribing input pad configured to displace under the applied force; a plurality of isolated beam segments, defined by the plurality of apertures, and operable to receive resultant forces distributed to the isolated beam segments by the displacement of the input pad; at least two sensors, disposed along each isolated beam segment, and configured to measure the forces transmitted from the input pad to the periphery and to output a signal corresponding to the applied force. One or more processing means operable with the plurality of sensors may be utilized to receive the signal and to determine at least one of a location and/or magnitude of the applied force acting on the input pad.

Claims

1. An input device adapted to determine a location and magnitude of an applied force, the input device comprising:

a base support having a periphery and a plurality of apertures formed therein to define an input pad configured to displace under the applied force;

a plurality of isolated beam segments defined by the plurality of apertures and operable to receive resultant forces as distributed from the displacement of the input pad caused by the applied force, and to undergo a degree of deflection, the isolated beam segments being adapted to constrain movement of the base support from off-axis forces acting on the base support; and

at least one sensor operable with each isolated beam segment to output a signal corresponding to the degree of deflection of the respective isolated beam segments caused by the forces distributed to the isolated beam segments from the input pad, the signal facilitating the determination of a location of the applied force.

2. The input device of claim 1, further comprising a pair of sensors disposed about and operable with each isolated beam segment.

3. The input device of claim 2, wherein the pair of sensors operate to cancel out the off-axis forces, thus minimizing sensitivity of the input device to off-axis forces.

4. An input device adapted to determine a location and magnitude of an applied force, the input device comprising:

a first structural element supported in a fixed position;

a second structural element operable with the first structural element, and dynamically supported to be movable with respect to the first structural element to provide an input pad adapted to displace in response to the applied force;

a plurality of sensing components formed and defined by a plurality of apertures and the relationship of the first and second structural elements, the sensing components being adapted to undergo a degree of deflection in response to an applied force acting about the input pad and resultant forces of the applied force being distributed and concentrated in the sensing components, the plurality of sensing components being adapted to constrain movement of the base support from off-axis forces acting on the base support; and

at least one sensor operable with each sensing component to output a signal corresponding to the degree of deflection of the respective isolated beam segments caused by the forces distributed to the isolated beam segments from the input pad, the signal facilitating the determination of a location of the applied force.

5. A method for determining at least one of location and magnitude of a force applied to an input pad, the method comprising:

providing a base support with an input pad and a plurality of isolated beam segments defined by a plurality of apertures formed in the base support, the isolated beam segments each having at least one sensor disposed on a surface thereof;

configuring the input pad to displace in response to an applied force, the applied force comprising a plurality of resultant forces that are transferred and concentrated in the isolated beam segments causing each to undergo a degree of deflection;

constraining, by the isolated beam segments, movement of the base support from off-axis forces acting on the base support;

outputting various signals corresponding to the degree of deflection in each of the isolated beam segments; and

processing the output signals to determine the location of the force applied to the input pad.

6. The method of claim 5, further comprising supporting the base support using a fixed frame element.

7. The method of claim 6, wherein the base support and the fixed frame element are related and supported by a constraint module, the fixed frame element and the base support having a gap therebetween to permit displacement of the base support and input pad.