Strain gauge transducer force or weight measurement arrangement and touch tablet
First Claim
1. A strain-gauge transducer, comprising:
- two pressure members which are deformable in response to an applied force;
at least one strain gauge having a substrate disposed between the two pressure members; and
a plurality of strain detectors and transfer means comprising segments of an elastic material integrally molded to the substrate and located between the substrate and the pressure members to transmit the applied force.
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Accused Products
Abstract
A strain-gauge transducer (5) comprising a substrate (10) provided with strain gauges and pressure members (11, 12) which deform the substrate (10) via transfer elements (1a, 4a) which transmit an applied force (F). The transfer elements comprise bars (1a, 1b, 4a, 4b) molded from an elastomer in a common molding operation. A material (2a, 3a) having a higher compressibility than the bars may be interposed between the bars. This material may form elastic stops (54a) provided to preclude breakage of the substrate. This results in a transducer whose sensitivity is linear for small loads and which is very insusceptible to overloading. The transducer can be used for the construction of scales or touch tablets.
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Citations
15 Claims
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1. A strain-gauge transducer, comprising:
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two pressure members which are deformable in response to an applied force; at least one strain gauge having a substrate disposed between the two pressure members; and a plurality of strain detectors and transfer means comprising segments of an elastic material integrally molded to the substrate and located between the substrate and the pressure members to transmit the applied force. - View Dependent Claims (2, 3, 4, 5)
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6. A strain-gauge transducer, comprising:
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at least one strain gauge including a substrate; a strain detector in contact with a side of the substrate; two pressure members each one of which is disposed adjacent an opposing side of the substrate which deform the strain gauge under the influence of an applied force; transfer means disposed between each said pressure member and the substrate for transmitting the applied force, including segments of an elastic material molded on the substrate in a single molding operation for positioning and dimensioning said segments on the substrate; and a stop attached to an opposite surface of the substrate that the segment is molded to and located opposite the segment, having a higher compressibility than an adjacent segment, to limit the deflection of the substrate. - View Dependent Claims (7)
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8. A strain-gauge transducer, comprising:
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at least one strain gauge including a substrate; a strain detector in contact with a side of the substrate; two pressure members each one of which is disposed adjacent an opposing side of the substrate which deform the strain gauge under the influence of an applied force; transfer means disposed between each said pressure member and the substrate for transmitting the applied force, including segments of an elastic material molded on the substrate in a single molding operation wherein the segments are positioned and dimensioned during the single molding operation for positioning and dimensioning said segments on the substrate; and a stop attached to an opposite surface of the substrate that the segment is molded to and located opposite the segment wherein the stop is positioned and dimensioned during the single molding operation.
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9. A touch tablet, comprising:
at least one transducer including two pressure members which are deformable in response to an applied force; at least one strain gauge having a substrate disposed between the two pressure members; and a plurality of strain detectors and transfer means comprising segments of an elastic material integrally molded to the substrate and located between the substrate and the pressure members to transmit the applied force.
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10. A method for producing a strain gauge transducer, comprising the steps of:
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positioning and dimensioning a plurality of strain detectors and transfer means comprising segments of an elastic material on a surface of a substrate by molding the elastic material on the substrate in a single molding operation; and disposing at least one strain gauge including the substrate between two deformable pressure members. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification