Coordinate input/detection device detecting installation position of light-receiving device used for detecting coordinates
First Claim
1. A coordinate input/detection device provided with a coordinate input area, comprising:
- a plurality of retro reflectors provided around the coordinate input area;
a first light-emitting unit;
a second light-emitting unit;
a first light-receiving unit that corresponds to a first position, and is installed at one of first and second positions, at which said first light-receiving unit receives light emitted from said first light-emitting unit to the plurality of retro reflectors and reflected by the plurality of retro reflectors;
a second light-receiving unit that corresponds to the second position, and is installed at the other position among the first and second positions, at which said second light-receiving unit receives the light emitted from said second light-emitting unit to the plurality of retro reflectors and reflected by the plurality of retro reflectors; and
a position recognition unit recognizing whether each of said first and second light-receiving units is installed at the first position or the second position, based on an output signal of each of said first and second light-receiving units, wherein a ratio of a height to a width of two adjacent retro reflectors among the plurality of retro reflectors is variable, and said position recognition unit recognizes whether each of said first and second light-receiving units is installed at the first position or the second position, in a condition in which said ratio is not one to one, if a shape of the coordinate input area is a square.
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Accused Products
Abstract
A coordinate input/detection device is provided with a coordinate input area. The coordinate input/detection device uses first and second light-emitting units to emit light to a plurality of retro reflectors provided around the coordinate input area. The plurality of retro reflectors reflect the light from the first light-emitting unit toward a first light-receiving unit provided at one of first and second positions, and the light from the second light-emitting unit toward a second light-receiving unit provided at the other position among the first and second positions, the first and second light-receiving units corresponding to the first and second positions respectively. A position recognition unit recognizes whether each of the first and second light-receiving units is installed at the first position or the second position, based on an output signal of each of the first and second light-receiving units. Additionally, a coordinate detection unit detects coordinates of a pointing unit inserted to the coordinate input area, based on output signals of said first and second light-receiving units.
112 Citations
25 Claims
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1. A coordinate input/detection device provided with a coordinate input area, comprising:
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a plurality of retro reflectors provided around the coordinate input area;
a first light-emitting unit;
a second light-emitting unit;
a first light-receiving unit that corresponds to a first position, and is installed at one of first and second positions, at which said first light-receiving unit receives light emitted from said first light-emitting unit to the plurality of retro reflectors and reflected by the plurality of retro reflectors;
a second light-receiving unit that corresponds to the second position, and is installed at the other position among the first and second positions, at which said second light-receiving unit receives the light emitted from said second light-emitting unit to the plurality of retro reflectors and reflected by the plurality of retro reflectors; and
a position recognition unit recognizing whether each of said first and second light-receiving units is installed at the first position or the second position, based on an output signal of each of said first and second light-receiving units, wherein a ratio of a height to a width of two adjacent retro reflectors among the plurality of retro reflectors is variable, and said position recognition unit recognizes whether each of said first and second light-receiving units is installed at the first position or the second position, in a condition in which said ratio is not one to one, if a shape of the coordinate input area is a square. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A device by which information is written on a drawing board comprising:
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a writing surface providing a coordinate input area; and
a coordinate input/detection device attached to the coordinate input area, including;
a plurality of retro reflectors provided around the coordinate input area;
a first light-emitting unit;
a second light-emitting unit;
a first light-receiving unit that corresponds to a first position, and is installed at one of first and second positions, at which said first light-receiving unit receives light emitted from said first light-emitting unit to the plurality of retro reflectors and reflected by the plurality of retro reflectors;
a second light-receiving unit that corresponds to the second position, and is installed at the other position among the first and second positions, at which said second light-receiving unit receives the light emitted from said second light-emitting unit to the plurality of retro reflectors and reflected by the plurality of retro reflectors;
a position recognition unit recognizing whether each of said first and second light-receiving units is installed at the first position or the second position based on an output signal of each of said first and second light-receiving units; and
a coordinate detection unit detecting coordinates of a pointing unit inserted to the coordinate input area based on output signals of said first and second light-receiving units, wherein a ratio of a height to a width of two adjacent retro reflectors among the plurality of retro reflectors is variable, and said position recognition unit recognizes whether each of said first and second light-receiving units is installed at the first position or the second position, in a condition in which said ratio is not one to one, if a shape of the coordinate input area is a square. - View Dependent Claims (18)
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19. A method of detecting installation positions of first and second light-receiving units respectively corresponding to first and second positions, in a coordinate input/detection device including a pair of light-emitting units, and a plurality of retro reflectors around a coordinate input area, said method comprising the steps of:
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emitting light to the plurality of retro reflectors by use of said pair of light-emitting units;
receiving the light emitted from one of the first and second light-emitting units and reflected by the plurality of retro reflectors, by use of the first light-receiving unit installed at one of the first and second positions;
receiving the light emitted from the other light-emitting unit and reflected by the plurality of retro reflectors, by use of the second light-receiving unit installed at the other position among the first and second positions; and
recognizing whether each of said first and second light-receiving units is installed at the first position or the second position, based on an output signal of each of said first and second light-receiving units, wherein a ratio of a height to a width of two adjacent retro reflectors among the plurality of retro reflectors is variable, and said position recognition step recognizes whether each of said first and second light-receiving units is installed at the first position or the second position, in a condition in which said ratio is not one to one, if a shape of the coordinate input area is a square. - View Dependent Claims (20, 21, 22)
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23. A recording medium readable by a machine, tangibly embodying a program of instructions executable by the machine to control a coordinate input/detection device provided with a coordinate input area, said coordinate input/detection device comprising:
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a plurality of retro reflectors provided around the coordinate input area;
a first light-emitting unit;
a second light-emitting unit;
a first light-receiving unit that corresponds to a first position, and is installed at one of first and second positions, at which said first light receiving unit receives light emitted from said first light-emitting unit to the plurality of retro reflectors and reflected by the plurality of retro reflectors;
a second light-receiving unit that corresponds to the second position, and is installed at the other position among the first and second positions, at which said second light-receiving unit receives the light emitted from said second light-emitting unit to the plurality of retro reflectors and reflected by the plurality of retro reflectors; and
a coordinate detection unit detecting coordinates of a pointing unit inserted to the coordinate input area based on output signals of said first and second light-receiving units, wherein said program is executed by the machine to perform a position recognition function to recognize whether each of said first and second light-receiving units is installed at the first position or the second position, based on an output signal of each of said first and second light-receiving units, and wherein a ratio of a height to a width of two adjacent retro reflectors among the plurality of retro reflectors is variable, and said position recognition function recognizes whether each of said first and second light-receiving units is installed at the first position or the second position, in a condition in which said ratio is not one to one, if a shape of the coordinate input area is a square. - View Dependent Claims (24, 25)
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Specification