Apparatus for detecting an approaching conductor, or an approach point of a conductor and an electrostatic capacity type touch panel apparatus
First Claim
1. An apparatus for detecting a approach point or position of a conductor on a sensor panel, including a voltage-oscillating system and a non-oscillating system;
- said voltage-oscillating system having the sensor panel which is operated by over 200 kHz frequency oscillatory voltage generator so that a AC current flowing through an electrostatic coupling between said sensor panel and said conductor is equivalently received, the sensor panel having a resistor with uniform face resistance in the two-dimensional directions and electrodes closely disposed in the periphery of said resistor, signal processing means on which AC currents from four corners of the sensor panel are impressed, a voltage oscillating system ground circuit to be also connected with the signal processing means, and a power circuit which voltage oscillates in same amplitude and same phase with respect to the voltage oscillating system ground circuit, the power circuit being connected with the signal processing means;
said non-oscillating system having an interface with said voltage oscillating system and at least one or more external apparatus; and
further including an isolator thorough which a digital or an analog electric information is transferred between said signal processing means and said interface.
1 Assignment
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Accused Products
Abstract
There are provided an apparatus for detecting an approaching conductor and an approach point or position of a conductor, in which a signal processing is simply performed and an improvement in the noise resistance is performed without the influence of a floating capacity. The apparatus has a voltage-oscillating system for equivalently receiving electric oscillation (AC signal) from a detected conductor so that the received electric oscillation is processed as a signal to ground and the processed signal is send to a non-oscillating system through an isolator, the system including a sensor panel or a sensor conductive array, a shield plate, a signal processing circuit, a ground, and power source. In addition, in order to clearly and securably identify a cause of the false earth effect of a detected conductor such as a human body, over 200 kHz oscillation frequency is provided. There is also provided an electrostatic capacity coupling type touch panel apparatus, in which an AC signal is applied into a finger, AC signal being 200 or more kHz frequency.
122 Citations
5 Claims
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1. An apparatus for detecting a approach point or position of a conductor on a sensor panel, including a voltage-oscillating system and a non-oscillating system;
- said voltage-oscillating system having the sensor panel which is operated by over 200 kHz frequency oscillatory voltage generator so that a AC current flowing through an electrostatic coupling between said sensor panel and said conductor is equivalently received, the sensor panel having a resistor with uniform face resistance in the two-dimensional directions and electrodes closely disposed in the periphery of said resistor, signal processing means on which AC currents from four corners of the sensor panel are impressed, a voltage oscillating system ground circuit to be also connected with the signal processing means, and a power circuit which voltage oscillates in same amplitude and same phase with respect to the voltage oscillating system ground circuit, the power circuit being connected with the signal processing means;
said non-oscillating system having an interface with said voltage oscillating system and at least one or more external apparatus; and
further including an isolator thorough which a digital or an analog electric information is transferred between said signal processing means and said interface. - View Dependent Claims (2, 3, 4)
- said voltage-oscillating system having the sensor panel which is operated by over 200 kHz frequency oscillatory voltage generator so that a AC current flowing through an electrostatic coupling between said sensor panel and said conductor is equivalently received, the sensor panel having a resistor with uniform face resistance in the two-dimensional directions and electrodes closely disposed in the periphery of said resistor, signal processing means on which AC currents from four corners of the sensor panel are impressed, a voltage oscillating system ground circuit to be also connected with the signal processing means, and a power circuit which voltage oscillates in same amplitude and same phase with respect to the voltage oscillating system ground circuit, the power circuit being connected with the signal processing means;
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5. An apparatus for detecting an approach position on a position indication means on the surface of a sensor panel including:
- at least the sensor panel for receiving AC signal which is actively or equivalently transmitted from said position through an electrostatic coupling, the sensor panel having a resistor with an uniform resistant face in the two-dimensional directions; and
a current/voltage conversion circuit on which AC currents from four corners of the sensor panel are impressed;
the current/voltage conversion circuit including an emitter input transistor to be base-grounded through a resistance, parallel resonant circuit connected to a collector of said transistor LC, and an inverted amplifier for inverting and amplifying a voltage variation of said emitter input to be applied to a base of said transistor.
- at least the sensor panel for receiving AC signal which is actively or equivalently transmitted from said position through an electrostatic coupling, the sensor panel having a resistor with an uniform resistant face in the two-dimensional directions; and
Specification