Apparatus and method for recognizing coordinates

A coordinate recognition apparatus, comprising:

• a plurality of light-emitting devices arranged in an array along an X direction;
• a plurality of light-receiving devices arranged in an array parallel to the array of the light-emitting devices and configured to detect light emitted by the light-emitting devices;
• a plurality of light-emitting devices arranged in an array along a Y direction orthogonal to the X direction in the plane;
• a plurality of light-receiving devices arranged in an array along the Y direction in the plane and configured to detect light emitted by the light-receiving devices arranged in the Y direction;
• and
• a controller configured to selectively drive the light-emitting devices and the light-receiving devices a plurality of groups of light paths each including a plurality of light paths parallel to one another in a plane including the light-emitting devices and the light-receiving devices such that an angle of the light paths varies from group to group, identify a position p and a position I of each of the groups of light paths based on an output from each of the light-receiving devices, the position p being in the X direction of the light-receiving device corresponding to the light path that passes through a center of a region shielded by an object, the position I being in the X direction of the light-emitting device forming the same light path, and calculate coordinates of the center of the light shield region in the plane based on the identified positions p and I of each of the groups of light paths, wherein the controller:
• selectively drives the light-emitting devices and the light-receiving devices arranged in the Y direction and forms a plurality of groups of light paths each including a plurality of light paths parallel to each other in the plane such that an angle of the light paths varies from group to group,
• identifies a position p and a position I of each of the groups of light paths, formed by the light-emitting devices and the light-receiving devices arranged in the Y direction, based on an output from each of the light-receiving devices arranged in the Y direction, the position p being in the Y direction of the light-receiving device forming the light path that passes through the center of a region shielded by an object, the position I being in the Y direction of the light-emitting device forming the same light path,
• calculates coordinates of the center of the light shield region based on the identified positions p and I of each of the groups of light paths,
• determines conclusive coordinates of the center using the coordinates of the calculated center of the light-emitting devices and the light-receiving devices arranged in the X direction, and coordinates of the calculated center of the light-emitting devices and the light-receiving devices arranged in the Y direction,
• obtains a first regression line using the positions p and I of each of the groups of light paths formed by driving the light-emitting devices and the light-receiving devices arranged in the X direction as a sample, with respect to a PL plane formed by using a position P of each of the light-receiving devices in the X direction and a position L of the light-emitting devices in the X direction as axes, calculates a coordinate xx in the X direction and a coordinate yx in the Y direction of the center based on the first regression line,
• obtains a second regression line using the positions p and I of each of the groups of light paths formed by driving the light-emitting devices and the light-receiving devices arranged in the Y direction as a sample, with respect to the PL plane formed by using a position P of each of the light-receiving devices in the Y direction and a position L of the light-emitting devices in the L direction as axes, calculates a coordinate xY in the X direction and a coordinate yY in the Y direction of the center based on the second regression line,
• determines the conclusive coordinates based on the obtained coordinates xx, vx, xY, and yY,
• calculates b/(1−a) using a gradient a and an intercept b of the first regression line, sets the calculated result as the coordinate xx, calculates −ah/(1−a) using a distance h between the array of the light-emitting devices arranged in the X direction and the array of the light-receiving devices arranged in the X direction and the gradient a, sets the calculated result as the coordinate yx,
• calculates {−a/(1−a)}w using a distance w between the array of the light-emitting devices arranged in the Y direction and the array of the light-receiving devices arranged in the Y direction and the gradient a of the second regression line, sets the calculated result as the coordinate xY,
• calculates b/(1−a) using the gradient a and the intercept b of the second regression line, and
• sets the calculated result as the coordinate yY.

A method of recognizing coordinates, comprising:

• selectively driving a plurality of light-emitting devices arranged in an array along an X direction and a plurality of light-receiving devices arranged in an array parallel to the array of the light-emitting devices and configured to detect light emitted by the light-emitting devices and forming a plurality of groups of light paths each including a plurality of light paths parallel to one another in a plane including the light-emitting devices and the light-receiving devices such that an angle of the light paths varies from group to group;
• identifying a position p and a position I of each of the groups of light paths based on an output from each of the light-receiving devices, the position p being in the X direction of the light-receiving device corresponding to the light path that passes through the center of a region shielded by an object, the position I being in the X direction of the light-emitting device forming the same light path;
• and
• calculating coordinates of the center of the light shield region in the plane based on the identified positions p and I of each of the groups of light paths, wherein
• a regression line is obtained using the positions p and I of each of the groups of light paths as a sample, with respect to a PL plane formed by using a position P of each of the light-receiving devices in the X direction and a position L of the light-emitting devices in the X direction as axes, and coordinates of the center are calculated based on the obtained regression line, and
• b/(1−a) is calculated using a gradient a and an intercept b of the regression line, the calculated result is set as a coordinate of the center in the X direction, −ah/(1−a) is calculated using a distance h between the array of the light-emitting devices and the array of the light-receiving devices and the gradient a, and the calculated result is set as a coordinate of the center in a Y direction orthogonal to the X direction.

A method of recognizing coordinates, comprising:

• selectively driving a plurality of light-emitting devices arranged in an array along an arbitrary X direction and a plurality of light-receiving devices arranged in an array parallel to the array of the light-emitting devices and configured to detect light emitted by the light-emitting devices and forming a plurality of groups of light paths each including a plurality of light paths parallel to one another in a plane including the light-emitting devices and the light-receiving devices such that an angle of the light paths varies from group to group;
• identifying a position p and a position I of each of the groups of light paths based on an output from each of the light-receiving devices, the position p being in the X direction of the light-receiving device corresponding to the light path that passes through the center of a region shielded by an object, the position I being in the X direction of the light-emitting device forming the same light path;
• calculating coordinates of the center of the light shield region in the plane based on the identified positions p and I of each of the groups of light paths;
• selectively driving a plurality of light-emitting devices arranged in the Y direction in the plane and a plurality of light-receiving devices arranged in the Y direction in the plane and configured to detect light emitted by the light-receiving devices arranged in the Y direction and forming a plurality of groups of light paths each including a plurality of light paths parallel to one another in the plane such that an angle of the light paths varies from group to group;
• identifying a position p and a position I of each of the groups of light paths based on an output from each of the light-receiving devices arranged in the Y direction, the position p being in the Y direction of the light-receiving device corresponding to the light path that passes through the center of the light shield region, the position I being in the Y direction of the light-emitting device forming the same light path;
• calculating coordinates of the center of the light shield region based on the identified positions p and I of each of the groups of light paths;
• and
• determining conclusive coordinates of the center using the coordinates of the calculated center of the light-emitting devices and the light-receiving devices arranged in the X direction, and coordinates of the calculated center of the light-emitting devices and the light-receiving devices arranged in the Y direction, wherein
• a first regression line is obtained using the positions p and I of each of the groups of light paths formed by driving the light-emitting devices and the light-receiving devices arranged in the X direction as a sample, with respect to a PL plane formed by using a position P of each of the light-receiving devices in the X direction and the position L of the light-emitting devices in the X direction as axes, a coordinate xX in the X direction and a coordinate yX in the Y direction of the center are calculated based on the first regression line,
• a second regression line is obtained using the positions p and I of each of the groups of light paths formed by driving the light-emitting devices and the light-receiving devices arranged in the Y direction as a sample, with respect to a PL plane formed by using a position P of each of the light-receiving devices in the Y direction and the position L of the light-emitting devices in the L direction as axes, a coordinate xY in the X direction and a coordinate yY in the Y direction of the center are calculated based on the second regression line,
• the conclusive coordinates are determined based on the obtained coordinates xX, xY, and vY,
• b/(1−a) is calculated using a gradient a and an intercept b of the first regression line, the calculated result is set as the coordinate xX, −ah/(1−a) is calculated using a distance h between the array of the light-emitting devices arranged in the X direction and the array of the light-receiving devices arranged in the X direction and the gradient a, the calculated result is set as the coordinate yx,
• {−a/(1−a)}w is calculated using a distance w between the array of the light-emitting devices arranged in the Y direction and the array of the light-receiving devices arranged in the Y direction and the gradient a of the second regression line, the calculated result is set as the coordinate xY, b/(1−a) is calculated using the gradient a and the intercept b of the second regression line, and the calculated result is set as the coordinate yY.