Position detection system
First Claim
1. A position detection system for detecting a position of an object movable to fixed detection means, said system comprising:
- signal transmitter means provided at said movable objet and generating to transmit signals of electromagnetic wave and ultrasonic wave to said detection means;
first and second detection means for constituting said fixed detection means, said first detection means receiving to detect a signal of electromagnetic wave transmitted from said transmitter means, and said second detection means including detection elements for detecting a signal of ultrasonic wave transmitted from said transmitter means; and
position detection means for detecting a position of said movable object provided with said transmitter means by computing positional data of said object based on detecting a difference between the detection of the transmitted waves of said first and said second detection means;
wherein said second detection means defines an opening for passing to further transmit therethrough the transmitted signal of ultrasonic wave to said detection element by making the further transmitted ultrasonic wave propagate radially from a center of said opening to said detection element.
1 Assignment
0 Petitions
Accused Products
Abstract
A system for detecting a position of a stylus movable on an interactive board includes a position information transmitter and information detection sections. The stylus has the transmitter for transmitting to the detection sections electromagnetic wave signals or light signals, and ultrasonic wave signals. The position is detected based on measurement of direct distances for signal transmission between the stylus and the detection sections. The detected position information is output to a personal computer, image projector, printer, etc. Each detection section has an opening sized so that the ultrasonic waves are advantageously transmitted through the opening and substantially radially from its center to its piezoelectric element.
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Citations
19 Claims
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1. A position detection system for detecting a position of an object movable to fixed detection means, said system comprising:
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signal transmitter means provided at said movable objet and generating to transmit signals of electromagnetic wave and ultrasonic wave to said detection means;
first and second detection means for constituting said fixed detection means, said first detection means receiving to detect a signal of electromagnetic wave transmitted from said transmitter means, and said second detection means including detection elements for detecting a signal of ultrasonic wave transmitted from said transmitter means; and
position detection means for detecting a position of said movable object provided with said transmitter means by computing positional data of said object based on detecting a difference between the detection of the transmitted waves of said first and said second detection means;
wherein said second detection means defines an opening for passing to further transmit therethrough the transmitted signal of ultrasonic wave to said detection element by making the further transmitted ultrasonic wave propagate radially from a center of said opening to said detection element. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A coordinates detection system for detecting coordinates of an object movable to fixed detection means, said system comprising the fixed detection means, signal wave transmitter means and coordinates detection means, wherein:
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said signal wave transmitter means is provided at said movable objet and generates to transmit signals of electromagnetic wave and ultrasonic wave to said detection means;
said fixed detection means comprises first and second detection means, said first detection means receiving and detecting a signal of electromagnetic wave transmitted from said transmitter means, and said second detection means detecting a signal of ultrasonic wave transmitted directly from said transmitter means;
said coordinates detection means detecting coordinates of a position of said movable object provided with said transmitter means by detecting a time difference between the detection of the transmitted waves of said first and said second detection means;
said second detection means defining an opening for passing therethrough to further transmit the transmitted signal of ultrasonic wave to said detection element by making the transmitted ultrasonic wave propagate radially from a center of said opening to said detection element. - View Dependent Claims (8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19)
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13. A display system comprising:
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board means and writing means movable thereon for generating to transmit signals of electromagnetic wave and ultrasonic wave, thereby transmitting information of a position of said writing means on said board;
first detection means for detecting a signal of electromagnetic wave transmitted from said writing means;
second detection means for detecting a signal of said ultrasonic wave transmitted from said writing means;
position detection means for detecting a position of said writing means on said board means based on signal detection results of said first detection means and said second detection means;
storage means for storing position information detected by said position detection means;
a computer having display means; and
transmission means for transmitting said position information stored in said storage means to said computer and enabling said display means based on the transmitted position information;
whereinsaid second detection means defines an opening for passing to further transmit therethrough the transmitted signal of ultrasonic wave to said detection element by making the further transmitted ultrasonic wave propagate radially from a center of said opening to said detection element.
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Specification