Inducing capacitance detector and capacitive position detector of using same
First Claim
1. A capacitive position detector, comprising:
- (a) an input for providing a supply voltage, VIN;
(b) a capacitive sensor array, comprising;
(i) a first sensing output;
(ii) a second sensing output;
(iii) a plurality of capacitors, {C(m)}, m =1, 2, . . . , M, M being a positive integer, each capacitor C(m) having a first electrode and a second electrode;
(iv) a plurality of sensor resistors, {RS(m)}, each sensor resistor RS(m) having a first terminal and a second terminal, wherein the first and second terminals of the j-th sensor resistor RS(j) are electrically connected to the first electrodes of the j-th capacitor C(j) and the (j+1)-th capacitor C(j+1), respectively, j =1, 2, . . . , (M−
1), and the first and second terminals of the M-th sensor resistor RS(M) are electrically connected to the first electrode of the M-th capacitor C(M) and the first sensing output, respectively; and
(v) a plurality of reference resistors, {RCOM(m)}, each reference resistor RCOM(m) having a first terminal and a second terminal, wherein the first and second terminals of the j-th reference resistor RCOM(j) are electrically connected to the second electrodes of the j-th capacitor C(j) and the (j+1)-th capacitor C(j+1), respectively, and the first and second terminals of the M-th reference resistor RCOM(M) are electrically connected to the second electrode of the M-th capacitor C(M) and the second sensing output, respectively; and
(c) an operational amplifier having an inverting input terminal electrically coupled to the first sensing output of the capacitive sensor array, and a non-inverting input terminal, and an output terminal, wherein the non-inverting input terminal and the second sensing output of the capacitive sensor array are electrically connected in common to the input, and wherein an output terminal is adapted for outputting an output signal, VOUT; and
(d) a feedback capacitor CT electrically connected between the inventing input terminal and the output terminal of the operational amplifier.
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Abstract
One aspect of the present invention relates to an inducing capacitance detector. In one embodiment, the inducing capacitance detector has an input terminal for receiving a supply voltage; a capacitive sensor array with a first output terminal and a second output terminal; an operational amplifier having an inventing input terminal electrically connected to the first output terminal of the capacitive sensor array, a non-inventing input terminal electrically connected to the second output terminal of the capacitive sensor array and the input terminal, and an output terminal for outputting an output signal, a feedback capacitor electrically connected between the inventing input terminal and the output terminal of the operational amplifier.
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Citations
11 Claims
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1. A capacitive position detector, comprising:
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(a) an input for providing a supply voltage, VIN; (b) a capacitive sensor array, comprising; (i) a first sensing output; (ii) a second sensing output; (iii) a plurality of capacitors, {C(m)}, m =1, 2, . . . , M, M being a positive integer, each capacitor C(m) having a first electrode and a second electrode; (iv) a plurality of sensor resistors, {RS(m)}, each sensor resistor RS(m) having a first terminal and a second terminal, wherein the first and second terminals of the j-th sensor resistor RS(j) are electrically connected to the first electrodes of the j-th capacitor C(j) and the (j+1)-th capacitor C(j+1), respectively, j =1, 2, . . . , (M−
1), and the first and second terminals of the M-th sensor resistor RS(M) are electrically connected to the first electrode of the M-th capacitor C(M) and the first sensing output, respectively; and(v) a plurality of reference resistors, {RCOM(m)}, each reference resistor RCOM(m) having a first terminal and a second terminal, wherein the first and second terminals of the j-th reference resistor RCOM(j) are electrically connected to the second electrodes of the j-th capacitor C(j) and the (j+1)-th capacitor C(j+1), respectively, and the first and second terminals of the M-th reference resistor RCOM(M) are electrically connected to the second electrode of the M-th capacitor C(M) and the second sensing output, respectively; and (c) an operational amplifier having an inverting input terminal electrically coupled to the first sensing output of the capacitive sensor array, and a non-inverting input terminal, and an output terminal, wherein the non-inverting input terminal and the second sensing output of the capacitive sensor array are electrically connected in common to the input, and wherein an output terminal is adapted for outputting an output signal, VOUT; and (d) a feedback capacitor CT electrically connected between the inventing input terminal and the output terminal of the operational amplifier. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A capacitive position detection device, comprising:
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(a) a plurality of sensor loading models, {S(m, n)}, m =1, 2, . . . , M, n =1, 2, . . . , N, each of M and N being an positive integer, spatially arranged in the form of matrix having M rows and N columns, each sensor loading model S(m, n) comprises; (i) first, second, third and fourth X-axis terminals, X1(m), X2(m), X3(m) and X4(m); (ii) first, second, third and fourth four Y-axis terminals, Y1(n), Y2(n), Y3(n) and Y4(n); (iii) an X-axis capacitor, CX, having a first electrode electrically connected to the first X-axis terminals X1(m) and a second electrode electrically connected to the second X-axis terminals X2(m); (iv) a Y-axis capacitor, CY, having a first electrode electrically connected to the third Y-axis terminals Y3(n) and a second electrode electrically connected to the fourth Y-axis terminals Y4(n); and (v) a X-Y-axis cross capacitor, CXY, having a first electrode electrically connected to the second electrode of the X-axis capacitor CX and a second electrode electrically connected to the first Y-axis terminal Y1(n); (vi) an X-axis sensor resistor, RX, having a first terminal electrically connected to the second electrode of the X-axis capacitor CX and a second terminal electrically connected to the fourth X-axis terminals X4(m); (vii) an X-axis VCOM resistor, RXCOM, having a first terminal electrically connected to the first electrode of the X-axis capacitor CX and a second terminal electrically connected to the third X-axis terminals X3(m) that is electrically connected to the second Y-axis terminals Y2(n); (viii) a Y-axis sensor resistor, RY, having a first terminal electrically connected to the second electrode of the X-Y-axis cross capacitor CXY and a second terminal electrically connected to the first electrode of the Y-axis capacitor CY; (ix) a Y-axis VCOM resistor, RYCOM, having a first terminal electrically connected to the second Y-axis terminals Y2(n) and a second terminal electrically connected to the second electrode of the Y-axis capacitor CY; wherein for the n-th column, the first and second X-axis terminals X1(j+1) and X2(j+1) of the (j+1)-th row sensor loading model S(j+1, n) are electrically connected to the third and fourth X-axis terminals X3(j) and X4(j) of the j-th row sensor loading model S(j, n), respectively, j =1, 2, . . . , (M−
1); andwherein for the m-th row, the first and second Y-axis terminals Y1(k+1) and Y2(k+1) of the (k+1)-th column sensor loading model S(m, k+1) are electrically connected to the third and fourth Y-axis terminals Y3(k) and Y4(k) of the k-th column sensor loading model S(m, k), respectively, k =1, 2, . . . , (N−
1); and(b) M X-axis detecting units, {DX(m)}, m =1, 2, . . . , M, each X-axis detecting unit DX(m) having first and second detecting inputs electrically connected to the third and fourth Y-axis terminals Y3(N) and Y4(N) of the m-th row and N-th column sensor loading model S(m, N), respectively; (c) N Y-axis detecting units, {DY(n)}, n =1, 2, . . . , N, each Y-axis detecting unit DY(n) having first and second detecting inputs electrically connected to the third and fourth X-axis terminals X3(M) and X4(M) of the M-th row and n-th column sensor loading model S(M, n), respectively. - View Dependent Claims (8, 9, 10, 11)
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Specification