Position detection device, position pointing device, position detecting method and pen-down detecting method
First Claim
1. A position detection device comprising a position pointing means having a light reflection means;
- a light emitting means for emitting light to said light reflection means of said position pointing means;
a light receiving means for receiving light from said light reflection means of said position pointing means; and
a coordinate calculation means for calculating the position coordinate of said position pointing means based on information from said light receiving means, said position detection device being characterized in that;
said position pointing means has a pen-like shape, and has a movable pen-core portion changeable in its position according to the pressing pressure against the surface of a board, and a light modulation means for changing the characteristics of the reflection light, and a transmission means for transmitting to said light modulation means the displacement of said movable pen-core portion; and
said light receiving means has an up/down state detection means for obtaining up- and down-state information of said position pointing means by detecting the characteristics of light which have been changed by said light modulation means.
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Accused Products
Abstract
A position detection device comprising a position pointer having a light reflector for reflecting light, an emitter for emitting light toward the light reflector, a light receiver for receiving light from the light reflector of the position pointer, a coordinate calculator for calculating a position coordinate of the position detecting device based on information from the light receiver. The position pointer is in the form of a pen and has a movable pen-core portion subject to displacement by the pressure on a surface of a board, a light modulator for changing characteristics of the reflection light, and a transmitter for transmitting the displacement of the pen-core portion to the light modulator. The light receiver has an up/down state detector for detecting characteristics of light changed by the light modulator and obtaining a pen-up and a pen-down information of the position pointer.
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Citations
28 Claims
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1. A position detection device comprising a position pointing means having a light reflection means;
- a light emitting means for emitting light to said light reflection means of said position pointing means;
a light receiving means for receiving light from said light reflection means of said position pointing means; and
a coordinate calculation means for calculating the position coordinate of said position pointing means based on information from said light receiving means, said position detection device being characterized in that;
said position pointing means has a pen-like shape, and has a movable pen-core portion changeable in its position according to the pressing pressure against the surface of a board, and a light modulation means for changing the characteristics of the reflection light, and a transmission means for transmitting to said light modulation means the displacement of said movable pen-core portion; and
said light receiving means has an up/down state detection means for obtaining up- and down-state information of said position pointing means by detecting the characteristics of light which have been changed by said light modulation means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a light emitting means for emitting light to said light reflection means of said position pointing means;
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9. A position pointing means used in an optical position detection device, said position pointing means having a pen-like shape, and comprising:
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a movable pen-core portion subject to displacement by pressure on a board;
a light modulation means for changing characteristics of reflection light; and
a transmission means for transmitting the displacement of said movable pen-core portion to said light modulation means. - View Dependent Claims (10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21)
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15. A position detection method using a position detection device which comprises:
- a position pointing means having a movable pen-core portion and a light reflection means having a retroreflective member;
a light emitting means for emitting the light to said light reflection means;
a light receiving means for receiving the light from said light reflection means of the position pointing means; and
a coordinate calculation means for calculating a position coordinate of said position pointing means based on information from said light receiving means, said method comprising the steps of;
emitting light from said light emitting means to the light reflection means of said position pointing means;
modulating light for changing characteristics of reflection light of said light reflection means based on displacement of said movable pen-core portion produced from the pressure of said position pointing means by an operator onto a coordinate detection surface of said position detection device; and
detecting a pen-down state for obtaining the pen-up and pen-down information of said position pointing means by detecting with said light receiving means characteristics of the light changed by said light modulation means.
- a position pointing means having a movable pen-core portion and a light reflection means having a retroreflective member;
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22. A pen-down state detection method using a position detection device which comprises:
- a position pointing means having a movable pen-core portion and a light reflection means having a retroreflective member;
a light emitting means for emitting the light to said light reflection means;
a light receiving means for receiving the light from said light reflection means of said position pointing means; and
a coordinate calculating means for calculating a position coordinate of said position pointing means based on information from said light receiving means, said method for detecting as to whether a tip of said movable pen-core portion is in contact with a position coordinate detection surface comprising the steps of;
emitting light from said light emitting means to the light reflection means of said position pointing means;
modulating light for changing characteristics of reflection light of said light reflection means based on displacement of said movable pen-core portion produced from the pressure of said position pointing means by an operator onto said position coordinate detection surface of said position detection device; and
detecting a pen-down state for obtaining the pen-up and pen-down information of said position pointing means by detecting with said light receiving means characteristics of the light changed by said light modulation means. - View Dependent Claims (23, 24, 25, 26, 27, 28)
- a position pointing means having a movable pen-core portion and a light reflection means having a retroreflective member;
Specification