Cordless position detection apparatus
First Claim
1. A cordless position detection apparatus, comprising:
- a position detection area in which a plurality of conductors are provided that are arranged in direction of the measurement of the position sidea selection circuit for selecting single conductors;
a transmitting circuit that provides a transmitting signal to a selected conductor said transmitting signal comprising at least one harmonic;
a pointer comprising a resonance circuit that is excited by the transmitting signal to oscillate and that radiates a receiving signal;
a receiving circuit for detecting the receiving signal in a selected conductor; and
processing means for determining a position indicated by the pointer by processing the receiving signals detected by the receiving circuit, wherein the resonance circuit is tuned to an harmonic of the transmitting signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A cordless position detection apparatus includes a position detection area and a pointer. A plurality of conductors are arranged side-by-side in the position detection area. The position detection area has a selection circuit for selecting single conductors, and a transmitting circuit that provides a transmitting signal having at least one harmonic to a selected conductor. A pointer for use with the position detecting area includes a resonance circuit which is tuned to an harmonic of the transmitting signal. The pointer is excited by the transmitting signal to oscillate and radiates a receiving signal. A receiving circuit in the detection apparatus detects the receiving signal in a selected conductor and processing means uses this received signal to determine a position indicated by the pointer.
-
Citations
56 Claims
-
1. A cordless position detection apparatus, comprising:
-
a position detection area in which a plurality of conductors are provided that are arranged in direction of the measurement of the position side a selection circuit for selecting single conductors; a transmitting circuit that provides a transmitting signal to a selected conductor said transmitting signal comprising at least one harmonic; a pointer comprising a resonance circuit that is excited by the transmitting signal to oscillate and that radiates a receiving signal; a receiving circuit for detecting the receiving signal in a selected conductor; and processing means for determining a position indicated by the pointer by processing the receiving signals detected by the receiving circuit, wherein the resonance circuit is tuned to an harmonic of the transmitting signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
-
- 43. A cordless position detection apparatus comprising a position detection area and a pointer, wherein a coil arranged around the position detection area is provided in order to supply energy to a first resonance circuit in the pointer.
-
46. A cordless position detection apparatus comprising:
a position detection area and a pointer, wherein the pointer comprises a resonance circuit and a plurality of pressure sensors, said pointer comprising means for translating the pressure values sensed by the pressure sensors into a time duration (t1, t2) during which characteristics of the oscillation in said resonance circuit are changed. - View Dependent Claims (47, 48, 55)
-
49. A cordless position detection apparatus comprising:
-
a position detection area in which a plurality of conductors are provided that are arranged in direction of the measurement of the position side by side; a selection circuit for selecting single conductors; a transmitting circuit that provides a transmitting signal to a selected conductor; a pointer comprising a resonance circuit that is excited by the transmitting signal to oscillate and that radiates a receiving signal; a receiving circuit for detecting the receiving signal in a selected conductor; and processing means for determining a position indicated by the pointer by processing the receiving signals detected by the receiving circuit; wherein the pointer further comprises a switch and a control circuit, said control circuit being adapted to open and close the switch to thereby enable or disable an oscillation in the resonance circuit whereby coded information can be transmitted from the pointer to the position detection area.
-
-
50. A cordless position detection apparatus comprising:
-
a position detection area in which a plurality of conductors are provided that are arranged in direction of the measurement of the position side by side; a selection circuit for selecting single conductors; a transmitting circuit that provides a transmitting signal to a selected conductor; a pointer comprising a resonance circuit that is excited by the transmitting signal to oscillate and that radiates a receiving signal; a receiving circuit for detecting the receiving signal in a selected conductor; processing means for determining a position indicated by the pointer by processing the receiving signals detected by the receiving circuit; and a control circuit adapted to enable or disable the transmitting signal, whereby coded information can be transmitted from the position detection area to the pointer.
-
-
51. A cordless position detection apparatus comprising:
-
a position detection area in which a plurality of conductors are provided that are arranged in direction of the measurement of the position side by side; a selection circuit for selecting single conductors; a transmitting circuit that provides a transmitting signal to a selected conductor; a pointer comprising a resonance circuit that is excited by the transmitting signal to oscillate and that radiates a receiving signal; a receiving circuit for detecting the receiving signal in a selected conductor; and processing means for determining a position indicated by the pointer by processing the receiving signals detected by the receiving circuit; wherein the pointer comprises a plurality of pressure sensors arranged under a common key or push button and wherein the resonance circuit comprises a coil that is non-circular. - View Dependent Claims (52, 53, 56)
-
-
54. A cordless position detection apparatus comprising:
-
a position detection area in which a plurality of conductors are provided that are arranged in direction of the measurement of the position side by side; a selection circuit for selecting single conductors; a transmitting circuit that provides a transmitting signal to a selected conductor; a pointer comprising a resonance circuit that is excited by the transmitting signal to oscillate and that radiates a receiving signal; a receiving circuit for detecting the receiving signal in a selected conductor; and processing means for determining a position indicated by the pointer by processing the receiving signals detected by the receiving circuit; wherein the pointer comprises a plurality of pressure sensors arranged under a common key or push button and at least a second resonance circuit.
-
Specification