Force sensor with angled coupling
First Claim
Patent Images
1. A force sensor assembly comprising:
- a housing;
a load bearing member for receiving an input force to be sensed, said load bearing member having a first protrusion with round end for engagement with the coupling;
circuitry for converting the input force into an output signal indicative of the input force;
a coupling for transmitting the input force to the load bearing member, said coupling having a second protrusion extending centrally from a flange such that the distal end of the protrusion engages the rounded end of the first protrusion from the load bearing member;
a compressible reservoir containing dilatant fluid mounted between the housing and the flange to restrict the input force to the load bearing member caused by shock loading to the coupling,wherein the housing defines a recess for the circuitry, the rounded end of the first protrusion from the load bearing member extends proud of the recess for engaging the coupling.
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Abstract
A force sensor particularly suited for use in an electronic stylus that senses an applied force on its nib for recording pen strokes and handwriting recognition. The sensor has a load bearing member for receiving an input force to be sensed and associated circuitry for converting the input force into an output signal indicative of the input force. A coupling at least partially transmits the applied force to be the input force acting on the load bearing member. The force transfer coupling transferring the forces so that the applied force and the input force are not co-linear.
36 Citations
15 Claims
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1. A force sensor assembly comprising:
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a housing; a load bearing member for receiving an input force to be sensed, said load bearing member having a first protrusion with round end for engagement with the coupling; circuitry for converting the input force into an output signal indicative of the input force; a coupling for transmitting the input force to the load bearing member, said coupling having a second protrusion extending centrally from a flange such that the distal end of the protrusion engages the rounded end of the first protrusion from the load bearing member; a compressible reservoir containing dilatant fluid mounted between the housing and the flange to restrict the input force to the load bearing member caused by shock loading to the coupling, wherein the housing defines a recess for the circuitry, the rounded end of the first protrusion from the load bearing member extends proud of the recess for engaging the coupling. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electronic stylus comprising:
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an elongate body; a nib extending from one end of the elongate body; and
,a load bearing member mounted to the elongate body for receiving an input force caused by contact on the nib, said load bearing member having a first protrusion with round end for engagement with the coupling; circuitry for converting the input force into an output signal indicative of the input force; a coupling for transmitting the input force to the load bearing member, said coupling having a second protrusion extending centrally from a flange such that the distal end of the protrusion engages the rounded end of the first protrusion from the load bearing member; and
,a compressible reservoir containing dilatant fluid mounted between the housing and the flange to restrict the input force to the load bearing member caused by shock loading to the coupling, wherein the housing defines a recess for the circuitry, the rounded end of the first protrusion from the load bearing member extends proud of the recess for engaging the coupling. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification