Article of manufacture bearing a universal alignment target
First Claim
Patent Images
1. An alignment target comprising:
- a target characterized by a fan shape;
the target having a plurality of blades; and
at least one blade of the plurality of blades being different from another blade in the plurality of blades.
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Abstract
An article of manufacture bearing an alignment target having at least one of the following attributes: it has no significant rotational symmetry; it has no significant orientation self-similarity or size self-similarity; it is not primarily composed of circles, circular arcs, straight lines, or right angles; and it may have other unique attributes. In one embodiment, the specific alignment targets are shapes consisting of at least one “generalized polar polygon.” Such a figure will include radial lines, circular arcs, and spiral segments when drawn in the Cartesian plane. In another embodiment, the specific alignment targets are members of a family of “fan” shapes.
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Citations
17 Claims
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1. An alignment target comprising:
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a target characterized by a fan shape;
the target having a plurality of blades; and
at least one blade of the plurality of blades being different from another blade in the plurality of blades. - View Dependent Claims (2, 3, 4)
at least one blade of the plurality of blades having a width different from the width of at least one other blade in the plurality of blades.
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3. The alignment target according to claim 1, further comprising:
at least one blade of the plurality of blades having a width different from the width of all other blades in the plurality of blades.
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4. The alignment target according to claim 1, wherein:
each of the plurality of blades having a width different from the width of all other blades in the plurality of blades.
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5. An alignment target comprising:
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a target characterized by a fan shape;
the target having a plurality of blades; and
at least one of the plurality of blades including at least one hole. - View Dependent Claims (6)
each of the plurality of blades includes at least one hole.
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7. An alignment target comprising:
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a target characterized by a fan shape;
the target having a plurality of blades separated by a like number of gaps to provide a plurality of gaps; and
at least one of the plurality of gaps having a width different from the width of at least one other gap in the plurality of gaps. - View Dependent Claims (8, 9)
at least one of the plurality of gaps having a width different from the width of all other gaps in the plurality of gaps.
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9. The alignment target according to claim 7, wherein:
each of the plurality of gaps having a width different from the width of all other gaps in the plurality of gaps.
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10. An alignment target comprising:
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a target characterized by a fan shape;
the target having a plurality of blades; and
at least one of the plurality of blades having a non-zero skew. - View Dependent Claims (11, 12, 13)
the skew of the at least one of the plurality of blades is different from a skew of at least one other blade in the plurality of blades.
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12. The alignment target according to claim 10 further comprising:
the skew of the at least one of the plurality of blades being different from a skew of all the other blades in the plurality of blades.
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13. The alignment target according to claim 10, wherein:
each of the plurality of blades having a skew different from the skew of all other blades in the plurality of blades.
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14. An alignment target comprising:
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a target characterized by a fan shape;
the target having a plurality of blades; and
at least one of the plurality of blades having a non-zero spiral. - View Dependent Claims (15, 16, 17)
the spiral of the at least one of the plurality of blades being different from a spiral of at least one other blade in the plurality of blades.
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16. The alignment target according to claim 14 further comprising:
the spiral of the at least one blade in the plurality of blades being different from the spiral of all other blades in the plurality of blades.
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17. The alignment target according to claim 14, wherein:
each of the plurality of blades having a spiral different from the spiral of all other blades in the plurality of blades.
Specification