Graphic input system
First Claim
Patent Images
1. A graphic input system for determining position coordinate data of a mobile element, comprising:
- transmitting means for transmitting signals;
mobile receiving means connected to the mobile element for receiving the signals;
mobile transmitting means for transmitting an electromagnetic signal in response to receipt of the signals by the mobile receiving means;
electromagnetic signal receiving means for receiving the electromagnetic signal;
timing means for determining the time elapsed between the transmission of the signals and the receipt of the electromagnetic signal; and
coordinate calculating means for calculating the position coordinate data from the elapsed time.
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Abstract
A graphic input system determining position coordinate data of a mobile element on a writing surface by measuring the transit times of ultrasonic signals and an electromagnetic signal. The mobile element may comprise either a writing instrument or an eraser. The electromagnetic signal contains information that represents the color of ink used in the writing instrument and identifies the portion of the eraser in contact with the writing surface.
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Citations
20 Claims
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1. A graphic input system for determining position coordinate data of a mobile element, comprising:
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transmitting means for transmitting signals; mobile receiving means connected to the mobile element for receiving the signals; mobile transmitting means for transmitting an electromagnetic signal in response to receipt of the signals by the mobile receiving means; electromagnetic signal receiving means for receiving the electromagnetic signal; timing means for determining the time elapsed between the transmission of the signals and the receipt of the electromagnetic signal; and coordinate calculating means for calculating the position coordinate data from the elapsed time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 20)
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12. A graphic input system for determining position coordinate data of a mobile element, the apparatus comprising:
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transmitting means for transmitting signals through an atmospheric medium; mobile receiving means connected to the mobile element for receiving the signals; mobile transmitting means for transmitting an electromagnetic signal in response to receipt of the signals by the mobile receiving means; electromagnetic signal receiving means for receiving the electromagnetic signal; and coordinate calculating means for calculating the position data from information derived from the electromagnetic signal receiving means. - View Dependent Claims (13, 14, 15)
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16. A graphic input system for determining position coordinate data of a mobile eraser, comprising:
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transmitting means for transmitting a signal; mobile receiving means connected to the mobile eraser for receiving the signal; mobile transmitting means for transmitting a response signal in response to receipt of the signal by the mobile receiving means; response signal receiving means for receiving response signal; and coordinate calculating means for calculating the position coordinate data from information derived from the response signal receiving means. - View Dependent Claims (17, 18, 19)
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Specification