Force sensing pointing device with click function
First Claim
1. A pointing device for integrating into portable electronic devices comprising:
- a bottom substrate having a top face and a bottom face, the top face including a sensing region comprising a plurality of interdigitated conductive trace regions, each trace region including interdigitated common and sense traces, the bottom substrate defining at least one via through the bottom substrate for each sense trace and the common trace, each via supporting a conductive path from one trace to at least one lead element, the bottom face supporting at least one lead element for each sense trace and the common trace, each lead element solderable to a printed circuit board;
a flexible substrate constructed from a heat resistant polymer, the flexible substrate having a resistive layer deposited on a bottom side;
a raised pedestal formed on the bottom substrate top face around at least a portion of the sensing region, the pedestal separating the plurality of the interdigitated conductive traces from the flexible substrate resistive layer;
a snap dome over the flexible substrate;
a keymat membrane covering the snap dome and the flexible substrate, the keymat membrane defining a protruding region surrounding the snap dome;
a center keycap positioned on the keymat membrane opposite the snap dome; and
a surrounding keycap positioned on the keymat membrane opposite the keymat membrane protruding region;
whereby depressing the center keycap collapses the snap dome and brings a portion of the flexible substrate under the snap dome into contact with the bottom substrate sensing region; and
whereby depressing the surrounding keycap pushes a portion of the flexible substrate protruding region which in turn pushes a portion of the flexible substrate under the portion of the flexible substrate protruding region into contact with the bottom substrate sensing region.
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Accused Products
Abstract
An input device for an electronic system includes a force sensor having conductive interdigitated traces on a bottom substrate and a flexible substrate spaced apart from the bottom substrate. The flexible substrate has a resistive layer deposited on a bottom side facing the interdigitated traces. A snap dome is positioned over a portion of the force sensor flexible substrate. A flexible keymat membrane is positioned over the force sensor and the snap dome. The keymat membrane bottom surface faces the force sensor flexible substrate. The keymat membrane bottom surface has a protruding region surrounding the snap dome and spaced above the force sensor flexible substrate. A center keycap on the keymat membrane top surface is positioned over the snap dome. A surrounding keycap on the keymat membrane encloses the center keycap and is positioned over the keymat membrane protruding region.
35 Citations
34 Claims
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1. A pointing device for integrating into portable electronic devices comprising:
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a bottom substrate having a top face and a bottom face, the top face including a sensing region comprising a plurality of interdigitated conductive trace regions, each trace region including interdigitated common and sense traces, the bottom substrate defining at least one via through the bottom substrate for each sense trace and the common trace, each via supporting a conductive path from one trace to at least one lead element, the bottom face supporting at least one lead element for each sense trace and the common trace, each lead element solderable to a printed circuit board; a flexible substrate constructed from a heat resistant polymer, the flexible substrate having a resistive layer deposited on a bottom side; a raised pedestal formed on the bottom substrate top face around at least a portion of the sensing region, the pedestal separating the plurality of the interdigitated conductive traces from the flexible substrate resistive layer; a snap dome over the flexible substrate; a keymat membrane covering the snap dome and the flexible substrate, the keymat membrane defining a protruding region surrounding the snap dome; a center keycap positioned on the keymat membrane opposite the snap dome; and a surrounding keycap positioned on the keymat membrane opposite the keymat membrane protruding region; whereby depressing the center keycap collapses the snap dome and brings a portion of the flexible substrate under the snap dome into contact with the bottom substrate sensing region; and whereby depressing the surrounding keycap pushes a portion of the flexible substrate protruding region which in turn pushes a portion of the flexible substrate under the portion of the flexible substrate protruding region into contact with the bottom substrate sensing region. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A pointing device for integrating into portable electronic devices comprising:
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a bottom substrate defining a top face and a bottom face; a central set of interdigitated conductive traces formed in a circular region on the bottom substrate top face; an annular region surrounding the central set of interdigitated conductive traces on the bottom substrate top face, the annular region including a plurality of sets of interdigitated conductive traces; a flexible substrate having a resistive layer deposited on a bottom side, the flexible substrate bottom side spaced above and facing the bottom substrate top surface; and a switch assembly positioned over the flexible substrate, the switch assembly including a central keycap surrounded by an annular keycap, the switch assembly positioned such that the central keycap is above the central set of interdigitated conductive traces and the annular keycap is over the annular region. - View Dependent Claims (9, 10, 11, 12)
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13. An input device for an electronic system comprising:
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a force sensor having a plurality of conductive interdigitated traces on a bottom substrate and a flexible substrate spaced apart from the bottom substrate, the flexible substrate having a resistive layer deposited on a bottom side facing the interdigitated traces; a snap dome positioned over a portion of the force sensor flexible substrate; a flexible keymat membrane having a top surface and a bottom surface positioned over the force sensor and the snap dome, the keymat membrane bottom surface facing the force sensor flexible substrate, the keymat membrane bottom surface defining a protruding region surrounding the snap dome, the protruding region spaced above the force sensor flexible substrate; a center keycap on the keymat membrane top surface positioned over the snap dome; and a surrounding keycap on the keymat membrane, the surrounding keycap enclosing the center keycap, the surrounding keycap positioned over the keymat membrane protruding region. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An input device comprising:
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a bottom substrate having a top face and a bottom face; a central sensing region comprising interdigitated conductive traces formed on the bottom substrate; a separation region surrounding the central sensing region on the bottom substrate, the separation region raised above the bottom substrate; a peripheral sensing region around the separation region, the peripheral sensing region comprising a plurality of sets of interdigitated conductive traces formed on the bottom substrate; a raised pedestal formed on the bottom substrate top face around at least a portion of the peripheral sensing region; a flexible substrate on the raised pedestal, the flexible substrate extending over the central sensing region, the separation region and the peripheral sensing region, the flexible substrate having a resistive layer deposited on a bottom side facing the central sensing region and the peripheral sensing region; a snap dome membrane to which is affixed a snap dome, the snap dome having a dome rim, the snap dome membrane positioned over the flexible substrate so that the dome rim is above the separation region; whereby compressing the snap dome forces the resistive layer on the flexible substrate above the central sensing region against the central sensing region but does not force the resistive layer on the flexible substrate above the peripheral sensing region against the peripheral sensing region. - View Dependent Claims (26)
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27. A method of making a surface mountable pointing device comprising:
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forming a thin bottom substrate material to have a top surface area of sufficient size to support a plurality of pointing devices; for each pointing device supported, forming a plurality of through holes in the bottom substrate material; for each pointing device supported, forming on the bottom substrate top surface at least one set of sensing conductive traces in a central sensing region, each set of sensing conductive traces including at least two electrically separate interdigitated sensing traces; for each pointing device supported, forming on the bottom substrate top surface a plurality of sets of sensing conductive traces in a peripheral sensing region surrounding the central sensing region; for each pointing device supported, forming at least one connecting conductive trace from each sensing conductive trace in the central sensing region and the peripheral sensing region to and into at least one of the through holes; depositing an insulative material on the bottom substrate top surface substantially around each peripheral sensing region, the insulative material forming a raised pedestal; forming a high temperature resistant flexible substrate sized to substantially cover the bottom substrate top surface, the flexible substrate coated with a resistive material on a bottom surface; adhering the flexible substrate bottom surface to the bottom substrate top surface such that, for each pointing device supported, resistive material is suspended above the central sensing region and the peripheral sensing region; adhering a snap dome support membrane to a top surface of the flexible substrate, the snap dome support membrane including one snap dome for each pointing device supported, the snap dome membrane positioned such that each snap dome is positioned over one of the central sensing regions; and dicing the bottom substrate to separate each pointing device. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34)
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Specification