Optical alignment detection system
First Claim
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1. An optical alignment detection system for detecting the alignment of a first object relative to a second object, the optical alignment system comprising:
- one or more light blocking regions and one or more non-light blocking regions, both fixed relative to the first object;
two or more light sources fixed relative to the second object, the two or more light sources adapted to provide light such that a light beam from at least one of the light sources intersects at least one of the one or more light blocking regions and a light beam from at least one other of the light sources intersects at least one of the one or more non-light blocking regions;
one or more detectors for detecting the light beams provided from the two or more light sources;
identifying block for identifying which of the two or more light sources provide a light beam that intersects the one or more light blocking regions and/or which of the two or more light sources provide a light beam that intersects the one or more non-light blocking regions; and
determining block for determining the alignment of the first object relative to the second object from the identified light source(s).
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Abstract
An optical alignment detection system for detecting the alignment of a first object relative to a second object is provided. One or more light sources and one or more light detectors, either or both of which are secured relative to the second object, are used to detect the position of one or more light scattering elements on the first object.
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Citations
18 Claims
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1. An optical alignment detection system for detecting the alignment of a first object relative to a second object, the optical alignment system comprising:
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one or more light blocking regions and one or more non-light blocking regions, both fixed relative to the first object; two or more light sources fixed relative to the second object, the two or more light sources adapted to provide light such that a light beam from at least one of the light sources intersects at least one of the one or more light blocking regions and a light beam from at least one other of the light sources intersects at least one of the one or more non-light blocking regions; one or more detectors for detecting the light beams provided from the two or more light sources; identifying block for identifying which of the two or more light sources provide a light beam that intersects the one or more light blocking regions and/or which of the two or more light sources provide a light beam that intersects the one or more non-light blocking regions; and determining block for determining the alignment of the first object relative to the second object from the identified light source(s). - View Dependent Claims (2, 3, 4, 17)
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5. An optical alignment detection system for detecting the alignment of a first object relative to a second object, the optical alignment system comprising:
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a light refracting element fixed relative to the first object; a light source fixed relative to the second object, the light source adapted to provide a light beam that intersects at least part of the light refracting element to produce a refracted light profile; and one or more detectors fixed relative to the second object for detecting the refracted light profile. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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18. An optical alignment detection system for detecting the alignment of a first object relative to a second object, the optical alignment system comprising:
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one or more light reflecting regions and one or more substantially non-light reflecting regions, both fixed relative to the first object; two or more light sources fixed relative to the second object, the two or more light sources adapted to provide light such that a light beam from at least one of the light sources intersects at least one of the one or more light reflecting regions and a light beam from at least one other of the light sources intersects at least one of the one or more substantially non-light reflecting regions; one or more detectors for detecting the light beams provided from the two or more light sources; identifying block for identifying which of the two or more light sources provide a light beam that intersects the one or more light reflecting regions and/or which of the two or more light sources provide a light beam that intersects the one or more substantially non-light reflecting regions; and determining block for determining the alignment of the first object relative to the second object from the identified light source(s).
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Specification