Coordinates input device and method for the same
First Claim
1. A method for inputting coordinates into a computer, comprising the acts of:
- receiving electromagnetic signals transmitted from a tablet (10) by a pointing device (20);
converting the electromagnetic signals to digital signals by the pointing device (20);
returning the digital signals to the tablet (10) by the pointing device (20);
receiving the digital signals sent back from the pointing device (20) by the tablet (10), and then proceeding with a signal confirmation process;
determining whether the signal received is of the highest intensity with the signal confirmation process by the tablet (10), and then sending out a status signal; and
making use of the digital signals received from the tablet (10) to determine a coordinate position of the pointing device (20) on a planar surface of the tablet (10), and passing the coordinate position and the status signals to the computer.
1 Assignment
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Accused Products
Abstract
A pointing device disposed at a specific position on top of a tablet receives an electromagnetic signal transmitted from the tablet, converts the signal to the digital format, and then sends the digitized signal back to the tablet. The signal transmission process includes signal confirmation to check if the signal received is of the highest intensity. The tablet receiving the digitized signal also has a confirmation process of its own, and then determines the coordinate position of the pointing device placed over the planar surface of the tablet based on the signal data. According to the method mentioned above, the digitized signal transmission between the pointing device and the tablet can be executed with no danger of interference over the coordinate designation signals, and also a number of error-protection measures are incorporated into the system to enhance the system accuracy and stability.
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Citations
20 Claims
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1. A method for inputting coordinates into a computer, comprising the acts of:
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receiving electromagnetic signals transmitted from a tablet (10) by a pointing device (20);
converting the electromagnetic signals to digital signals by the pointing device (20);
returning the digital signals to the tablet (10) by the pointing device (20);
receiving the digital signals sent back from the pointing device (20) by the tablet (10), and then proceeding with a signal confirmation process;
determining whether the signal received is of the highest intensity with the signal confirmation process by the tablet (10), and then sending out a status signal; and
making use of the digital signals received from the tablet (10) to determine a coordinate position of the pointing device (20) on a planar surface of the tablet (10), and passing the coordinate position and the status signals to the computer. - View Dependent Claims (2, 3, 4)
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5. A coordinates input device comprising a pointing device (20) and a tablet (10), wherein the pointing device (20) further comprising:
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a transmitter/receiver antenna set (21) for receiving analog signal transmitted by the tablet (10) and sending back digital signals to the tablet (10);
a pulse generator (22) connected with an output port of the transmitter/receiver antenna set (21) for generating a starting signal based on the analog signal received by the transmitter/receiver antenna set (21);
an analog/digital conversion unit (23) wherein a first input port is connected with the transmitter/receiver antenna set (21) through an amplifier (24) for converting the analog signals received to the digital signals;
a process control unit (25) wherein an input port is connected with the output port of the pulse generator (22), and an output port is connected with the analog/digital conversion unit (23); and
a save-and-compare unit (26) wherein an input port is connected with the output port of the analog/digital conversion unit (23) and press buttons (202,203) respectively, and an output port is connected with the transmitter/receiver antenna set (21) through a serial/parallel conversion unit (27). - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification