Multiple pad contact sensor and method for measuring contact forces at a plurality of separate locations

• US 5,086,652 A
• Filed: 02/25/1991
• Issued: 02/11/1992
• Est. Priority Date: 02/25/1991
• Status: Expired due to Term

• Current Assignee: Tekscan, Inc.
• Original Assignee: Fel-Pro Incorporated
• Inventors: Kropp, Harry C.
• Primary Examiner(s): MYRACLE, JERRY
• Application Number:
  US07/660,703
• Time in Patent Office: 351 Days
• Field of Search: 73/767, 73/772, 73/774, 73/862.38
• US Class Current: 73/767
• CPC Class Codes: A61B 5/22 Ergometry; Measuring muscular strength or the force of a muscular blow exercising apparatus A63B21/00 ; measuring of work or force in general G01L
• CPC Class Codes: A61C 19/05 for determining occlusion
• CPC Class Codes: G01B 7/32 for measuring areas
• CPC Class Codes: G01L 1/205 using distributed sensing elements
• CPC Class Codes: H05K 1/118 specially for flexible printed circuits, e.g. using folded portions
• CPC Class Codes: H05K 2201/052 Branched
• CPC Class Codes: H05K 2201/053 Tails
• CPC Class Codes: H05K 2201/10151 Sensor

Abstract

A contact sensor formed of a pair of thin flexible insulating sheets and having a plurality of elongate flexible leads, each connected to a single terminal and having an independent sensing pad positionable via the elongate flexible leads at separate selected locations between a pair of confronting surfaces to separately and independently sense the loads applied at the separate selected locations.

Claims

1. A contact sensor comprising a pair of thin flexible insulating sheets secured to each other in a confronting relationship and including a single terminal, a plurality of elongate flexible leads extending from said terminal, each said lead being separately flexible, and a sensing pad at the remote end of each lead,

each of said sensing pads having a first set of electrodes on one of said sheets and a second set of electrodes on the other of said sheets in a crossing relationship to said first set of electrodes, and pressure-sensitive resistive material disposed between said sets of electrodes in the zones of their crossing relationships, said sets of electrodes defining plural intersections in each of said sensing pads,

said terminal having a plurality of contacts and adapted to be received in a single connector having complementary contactors for receiving signals from said plurality of contacts,

and conductors extending from each of said electrodes along said leads to said terminal,

and each of said sensing pads being separately positionable via said separately flexible leads in separate selected locations between a pair of confronting surfaces to sense the loads applied at each said selected location.

2. A method of sensing loads applied by a pair of confronting surfaces at a plurality of discrete selected locations between them and sensing the loads via a single connector, comprising the steps of:

providing a contact sensor comprising a pair of thin flexible insulating sheets secured to each other in a confronting relationship and having a single terminal, a plurality of elongate flexible leads extending from said terminal, each said lead being separately flexible, and a sensing pad at the remote end of each lead, each of said sensing pads having a first set of electrodes on one of said sheets and a second set of electrodes on the other of said sheets in a crossing relationship to said first set of electrodes, to define plural intersections in each of said sensing pads, and pressure-sensitive resistive material disposed between said sets of electrodes in the zones of said intersections, said terminal having a plurality of contacts and adapted to be received in a single connector having complementary contactors for receiving signals from said plurality of contacts, and conductors extending from each of said electrodes along said leads to said terminal;

separately positioning each of said sensing pads via said separately flexible leads in separate selected locations between a pair of confronting surfaces;

compressing the confronting surfaces to compress the sensing pads between them; and

simultaneously sensing the loads at each of said locations.

3. A contact sensor comprising:

a pair of thin, flexible insulating sheets secured to each other in confronting relationship to define a single terminal portion, a plurality of elongate flexible lead portions extending from said terminal portion and being separately flexible, each of said lead portions terminating in a sensing pad portion at the remote end thereof;

each of said plurality of sensing pad portions comprising independent sensing pads, each being separately positionable generally independently of the others in separate selected locations between pairs of confronting surfaces to sense the load applied thereto at each of said selected locations;

each of said independent sensing pads having a first set of electrodes on one of said sheets, and a second set of electrodes on the other of said sheets in a crossing relationship to said first set of electrodes to define a plurality of intersections in each of said sensing pads, said first and second sets of electrodes for each of said sensing pads being mechanically and electrically separate from and independent of said first and second sets of electrodes, respectively, for each of the other sensing pads, said sensing pads further including pressure-sensitive resistive material disposed between said sets of electrodes in the zones of said intersections;

said terminal having a plurality of contacts and being adapted to be received in a single connector having complementary contactors for electrical connection to said plurality of contacts to apply and receive signals from selected ones thereof; and

a plurality of flexible conductors extending from each of said sets of electrodes for each of said sensing pads along said flexible leads to separate contacts in said terminal.

4. A contact sensor as claimed in claim 3 wherein each of said sensing pad are capable of being oriented in positions and at angles different from each of the other sensing pads.

5. A contact sensor as claimed in claim 3 wherein loads applied at any one of said locations and being sensed by one of said sensing pads are sensed simultaneously with the sensing of a load by another of said sensing pads without interference therebetween.