Position detection apparatus
First Claim
1. A position detection apparatus, comprising:
- a first position detection circuit including a first sensor formed of a first set of conductors disposed in a first direction and a second set of conductors disposed in a direction different from the first direction, a first conductor selection circuit connected to said first sensor and configured to select the first set of conductors in accordance with a transmission conductor selection sequence, and an oscillation circuit configured to supply a signal to the first set of conductors through said first conductor selection circuit, the first position detection circuit being configured to detect a position pointed to by a first pointer on said first sensor;
a second position detection circuit including a second sensor formed of a third set of conductors disposed in substantially the same direction as the first direction and a fourth set of conductors disposed in a direction different from the first direction, the second sensor being disposed in a superposed relationship with said first sensor, and a second conductor selection circuit connected to said second sensor and configured to select the third set of conductors disposed in substantially the same direction as the first direction in accordance with a reception conductor selection sequence, the second position detection circuit being configured to detect a position pointed to by a second pointer on said second sensor; and
a control circuit configured to direct said first conductor selection circuit to select a transmission conductor selection position among the first set of conductors where the first pointer is detected, and to direct said second conductor selection circuit to select a reception conductor selection position among the third set of conductors where the second pointer is detected, such that the selected transmission conductor selection position and the selected reception conductor selection position are separated from each other by a predetermined spatial distance.
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Accused Products
Abstract
A position detection apparatus is provided, which includes a plurality of position detection systems such as an electromagnetic-type position detection system and a capacitive-type position detection system. The apparatus is configured to select a transmission conductor among a plurality of transmission conductors in a first position detection system, and to select a reception conductor among a plurality of reception conductors in a second position detection system, so as to increase the spatial distance between the selected transmission conductor in the first position detection system and the selected reception conductor in the second position detection system as much as possible, to thereby reduce interference. Further, a relationship of frequency interleave may be provided between a transmission signal to be supplied to the transmission conductor in the first position detection system and another transmission signal to be supplied to the transmission conductor in the second position detection system.
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Citations
20 Claims
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1. A position detection apparatus, comprising:
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a first position detection circuit including a first sensor formed of a first set of conductors disposed in a first direction and a second set of conductors disposed in a direction different from the first direction, a first conductor selection circuit connected to said first sensor and configured to select the first set of conductors in accordance with a transmission conductor selection sequence, and an oscillation circuit configured to supply a signal to the first set of conductors through said first conductor selection circuit, the first position detection circuit being configured to detect a position pointed to by a first pointer on said first sensor; a second position detection circuit including a second sensor formed of a third set of conductors disposed in substantially the same direction as the first direction and a fourth set of conductors disposed in a direction different from the first direction, the second sensor being disposed in a superposed relationship with said first sensor, and a second conductor selection circuit connected to said second sensor and configured to select the third set of conductors disposed in substantially the same direction as the first direction in accordance with a reception conductor selection sequence, the second position detection circuit being configured to detect a position pointed to by a second pointer on said second sensor; and a control circuit configured to direct said first conductor selection circuit to select a transmission conductor selection position among the first set of conductors where the first pointer is detected, and to direct said second conductor selection circuit to select a reception conductor selection position among the third set of conductors where the second pointer is detected, such that the selected transmission conductor selection position and the selected reception conductor selection position are separated from each other by a predetermined spatial distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of detecting operation of one or more pointers on a first sensor and a second sensor, which are configured to detect operation of the one or more pointers and are disposed in a superposed relationship with each other, said first sensor including a first set of transmission conductors disposed in a predetermined direction and configured to transmit a first signal, said second sensor including a second set of reception conductors disposed in substantially the same direction as the first set of transmission conductors and configured to receive a second signal, said first sensor further including a third set of reception conductors and said second sensor further including a fourth set of transmission conductors both disposed in a direction different from said predetermined direction;
- the method comprising;
selecting a first transmission conductor among the first set of transmission conductors for transmitting the first signal where a first pointer is detected, and selecting a second reception conductor among the second set of reception conductors for receiving the second signal in where a second pointer is detected, such that the selected first transmission conductor and the selected second reception conductor are separated from each other by a predetermined spatial distance. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
- the method comprising;
Specification