Patent ID: 7187366

Claim:
An input system with detection of coordinates, comprising: four elongated electric conductors, being disposed at four lateral sides of the system and an insulation grounding device being connected to an end of the electric conductors; and a control circuit, being arranged in the system, and the control circuit further comprising: a microprocessor, electrically connected to another end of each of the four electric conductors to perform zero checking an overall magnetic field in an area surrounded by the electric conductors before the input system being operated and to control pulse current from a steady pulse power source before the pulse current being sent to the electric conductors; a field induced voltage transducer, being capable of being carried to be disposed in the area surrounded by the electric conductors and providing a button switch; a signal transmission device, being electrically connected to the button switch for sending a signal to the microprocessor once the button switch is pressed; and an analog/digital converter, being electrically connected to the field induced voltage transducer and connected to the microprocessor for converting a voltage to an X-coordinate value or a Y-coordinate value in the input system; wherein, first two of the electric conductors are disposed to correspond to an X-coordinate and a Y-coordinate of the input system respectively and second two of the electric conductors are disposed opposite to the preceding two electric conductors to correspond to the X-coordinate and the Y-coordinate too; whereby, when the button switch is pressed to allow the signal transmission device to send a signal to the microprocessor and the microprocessor performs a zero checking and sends the pulse current from the steady pulse power source to the elongated electric conductors, a magnetic field is produced to surround the electric conductors respectively such that the field induced voltage transducer induces a voltage corresponding to the magnetic field and the voltage is converted by the analog/digital converter as a first X-coordinate value, a first Y-coordinate value, a second X-coordinate value or a second Y-coordinate value depending on a distance between each of the electric conductors and the field induced voltage transducer being a vertical distance or a horizontal distance respectively.