Projector and projector accessory
First Claim
1. A projector, comprising:
- an infrared photodetector for photodetecting infrared light that is emitted by an electronic pen that is manipulated on a screen and that is provided with an infrared light emission device and an ultrasonic generator; and
at least two ultrasonic receivers that detect ultrasonic waves that are emitted by said electronic pen;
said projector being provided with capability for acquiring a position of said electronic pen on said screen.
3 Assignments
0 Petitions
Accused Products
Abstract
A projector for enlarging and projecting the display image on a light valve onto a screen is provided with: an infrared photodetector for photodetecting infrared light that is emitted by an electronic pen that is manipulated on the screen and that is provided with an infrared light emission device and ultrasonic generator; at least two ultrasonic receivers for detecting ultrasonic waves that are emitted by the electronic pen; means for measuring the distance to a screen; and means for supplying coordinate data in which the position of the electronic pen on the screen, which has been calculated based on output of the infrared photodetector, output of the ultrasonic generator, and output of the means for measuring the distance to the screen, has been normalized by the length of a side of a projected rectangular image that has been enlarged and projected.
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Citations
16 Claims
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1. A projector, comprising:
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an infrared photodetector for photodetecting infrared light that is emitted by an electronic pen that is manipulated on a screen and that is provided with an infrared light emission device and an ultrasonic generator; and at least two ultrasonic receivers that detect ultrasonic waves that are emitted by said electronic pen;
said projector being provided with capability for acquiring a position of said electronic pen on said screen. - View Dependent Claims (6)
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2. A projector, comprising:
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an infrared photodetector for photodetecting infrared light that is emitted by an electronic pen that is manipulated on a screen and that is provided with an infrared light emission device and an ultrasonic generator; at least two ultrasonic receivers that detect ultrasonic waves that are emitted by said electronic pen; and means for measuring a distance to said screen. - View Dependent Claims (3, 4, 7, 8, 9)
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5. A projector that enlarges and projects a display image that is on a light valve onto a screen, said projector comprising:
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an infrared photodetector for photodetecting infrared light that is emitted by an electronic pen that is manipulated on the screen and that is equipped with an infrared light emission device and an ultrasonic generator; at least two ultrasonic receivers for detecting ultrasonic waves that are emitted by said electronic pen; means for measuring a distance to said screen; means for supplying coordinate data in which a position of said electronic pen on said screen, which is calculated based on output of said infrared photodetector, output of said ultrasonic receivers, and output of said means for measuring the distance to said screen, has been normalized by a length of a side of a projected rectangular image that has been enlarged and projected; and means for; performing calibration by; estimating the projector-screen distance by using said electronic pen to indicate calibration points that are displayed by the projector; based on the projector-screen distance, correcting a vertical component of Cartesian coordinates derived by converting a distance to the pen tip; performing this correction for each of the calibration points; and storing the generated coordinates as corrected coordinates; and in actual drawing, for; generating Cartesian coordinates based on the distance to the pen tip; using the projector-screen distance that was obtained during calibration to correct the vertical component; and using the corrected coordinates that were obtained during calibration to convert Cartesian coordinates after correction to panel coordinate system. - View Dependent Claims (10)
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11. A projector accessory for a projector, said projector accessory, comprising:
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an infrared photodetector for photodetecting infrared light that is emitted by an electronic pen that is manipulated on a screen and that is provided with an infrared light emission device and an ultrasonic generator; at least two ultrasonic receivers for detecting ultrasonic waves that are emitted by said electronic pen; and means for measuring a distance to said screen. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification