System for detecting a position of a movable object without contact
First Claim
1. A position detecting system for detecting without contact a position of a movable object moving on a plane and having a light emitter, the system comprising:
- a first light image sensor which has a first view area and receives light from the light emitter of the movable object in the first view area to produce image data;
a second light image sensor which has a second view area and receives light from the light emitter of the movable object in the second view area to produce image data;
a combination of the first and second view areas covering said plane on which the movable object moves, and the first and second view areas overlapping each other in an overlap area wherein a borderline on said plane is defined; and
a processor means for calculating a position of the movable object based on image data produced by the first and second light sensors, said processor means including;
first and second memories respectively provided for storing said image data of the first and second light image sensors according to respective local address systems of said first and second light image sensor and representing said first and second view areas; and
a position calculator means for calculating a position of the movable object in the terms of a general address system unifying said local address systems of the first and second memories, the position calculator means including;
a border address calculating means for calculating border addresses of said borderline in the local address systems of the first and second memories, the border addresses corresponding to said border line defined in said overlap area of the first and second view areas; and
an address converting means for converting addresses in the respective local address systems to those in the general address system based on the border addresses.
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Accused Products
Abstract
A position detecting system for detecting a position of a movable object having a light emitter without contact, the system includes: a first light sensor which has a first view area and receives light from the light emitter of the movable object in the first view area to produce image data, and a second light sensor which has a second view area and receives light from the light emitter of the movable object in the second view area to produce image data, a combination of the first and second view areas covering a space in which the movable object moves, and the first and second view areas overlapping each other; and a processor which calculates a position of the movable object based on image data produced by the first and second light sensors.
112 Citations
8 Claims
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1. A position detecting system for detecting without contact a position of a movable object moving on a plane and having a light emitter, the system comprising:
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a first light image sensor which has a first view area and receives light from the light emitter of the movable object in the first view area to produce image data; a second light image sensor which has a second view area and receives light from the light emitter of the movable object in the second view area to produce image data; a combination of the first and second view areas covering said plane on which the movable object moves, and the first and second view areas overlapping each other in an overlap area wherein a borderline on said plane is defined; and a processor means for calculating a position of the movable object based on image data produced by the first and second light sensors, said processor means including; first and second memories respectively provided for storing said image data of the first and second light image sensors according to respective local address systems of said first and second light image sensor and representing said first and second view areas; and a position calculator means for calculating a position of the movable object in the terms of a general address system unifying said local address systems of the first and second memories, the position calculator means including; a border address calculating means for calculating border addresses of said borderline in the local address systems of the first and second memories, the border addresses corresponding to said border line defined in said overlap area of the first and second view areas; and an address converting means for converting addresses in the respective local address systems to those in the general address system based on the border addresses. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A position detecting system for detecting without contact a position of a movable object moving on a plane and having a light emitter, the system comprising:
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a first light image sensor which has a first view area and receives light from the light emitter of the movable object in the first view area to produce image data; a second light image sensor which has a second view area and receives light from the light emitter of the movable object in the second view area to produce image data; a combination of the first and second view areas covering said plane on which the movable object moves, and the first and second view areas overlapping each other in an overlap area wherein a substantially straight borderline on said plane between the first and second view areas is defined; and a processor means for calculating a position of the movable object based on image data produced by the first and second light sensors, said processor means including; first and second memories respectively provided for storing said image data of the first and second light image sensors according to respective local address systems of said first and second light image sensor and representing said first and second view areas; a border address calculating means for calculating border addresses of said substantially straight borderline in the local address systems of the first and second memories, the border addresses corresponding to curved borderlines in said local address systems due to distortion by the first and second light image sensors; a distortion compensation means for calculating address deviations due to said distortion; and a position calculator means for calculating a position of the movable object in the terms of a general address system unifying said local address systems of the first and second memories, the position calculator means including an address converting means for converting addresses in the respective local address systems to those in the general address system based on the border addresses and for correcting for said distortion by removing said address deviations from the position of the movable object in the general address system.
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Specification