Electronic stylus with low skew tip for capacitive touch screens
First Claim
1. An electronic stylus to be used with a capacitive touch screen, comprising:
- a tip portion having a tip and a supporting rod attached to the tip, the tip and the supporting rod being electrically conductive, wherein the tip portion further includesa first electrical shielding tube enclosing and shielding the supporting rod, anda second electrical shielding tube enclosing the first electrical shielding tube and the supporting rod;
a circuit coupled to the supporting rod to integrate and amplify a current induced at the tip, the circuit comprising a non-inverting integrator circuit and coupling an integrated non-inverted signal from the tip to the second electrical shielding tube; and
an electrically conductive housing to house the circuit therein, wherein the first electrical shielding tube and the second electrical shielding tube are to reduce skew effect between the supporting rod and a surface of a touch screen when the electronic stylus is held against the surface of the touch screen.
1 Assignment
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Accused Products
Abstract
An electronic stylus to be used with a capacitive touch screen includes a tip portion having an electrically conductive tip and an electrically conductive supporting rod attached to the tip. The tip portion further includes a first electrical shielding tube enclosing and shielding the supporting rod and a second electrical shielding tube enclosing the first electrical shielding tube and the supporting rod. The electrical stylus further includes a circuit coupled to the supporting rod to integrate and amplify a current induced at the tip and an electrical conductive housing to house the circuit therein. The first electrical shielding tube and the second electrical shielding tube are to reduce skew effect between the supporting rod and a surface of a touch screen when the electronic stylus is held against the surface of the touch screen.
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Citations
17 Claims
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1. An electronic stylus to be used with a capacitive touch screen, comprising:
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a tip portion having a tip and a supporting rod attached to the tip, the tip and the supporting rod being electrically conductive, wherein the tip portion further includes a first electrical shielding tube enclosing and shielding the supporting rod, and a second electrical shielding tube enclosing the first electrical shielding tube and the supporting rod; a circuit coupled to the supporting rod to integrate and amplify a current induced at the tip, the circuit comprising a non-inverting integrator circuit and coupling an integrated non-inverted signal from the tip to the second electrical shielding tube; and an electrically conductive housing to house the circuit therein, wherein the first electrical shielding tube and the second electrical shielding tube are to reduce skew effect between the supporting rod and a surface of a touch screen when the electronic stylus is held against the surface of the touch screen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electronic stylus to be used with a capacitive touch screen, comprising:
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a tip portion having a tip and a supporting rod attached to the tip, the tip and the supporting rod being electrically conductive; a non-inverting integrating amplifier circuit coupled to the supporting rod to integrate and amplify a current induced at the tip, wherein the integrating amplifier circuit comprises a first operational amplifier (op-amp) having a negative input coupled to the tip, a first resistor having a first end coupled to an output of the first op-amp and a second op-amp having a negative input coupled to a second end of the first resistor; wherein one of the first op-amp and the second op-amp having a capacitor coupled between the respective first or second op-amp'"'"'s negative input and its output; and wherein another of the first op-amp and the second op-amp having a resistor coupled between the respective first or second op-amp'"'"'s negative input and its output; a power supply circuit having a battery to provide power to the non-inverting integrating amplifier circuit; and an electrically conductive housing to house the non-inverting integrating amplifier circuit and the power supply circuit. - View Dependent Claims (10, 11)
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12. An electronic stylus to be used with a capacitive touch screen, comprising:
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a tip portion having a tip and a supporting rod attached to the tip, the tip and the supporting rod being electrically conductive; a non-inverting integrating amplifier circuit coupled to the supporting rod to integrate and amplify a current induced at the tip, wherein the non-inverting integrating amplifier circuit comprises; an inverting integrator having a negative input coupled to the tip to integrate a current induced at the tip, a gain control circuit coupled to an output of the inverting integrator and to an electrically conductive housing, and a resistor coupled between an output of the gain control circuit and a negative input of an inverting amplifier; a power supply circuit having a battery to provide power to the non-inverting integrating amplifier circuit; and an electrically conductive housing to house the non-inverting integrating amplifier circuit and the power supply circuit. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification