Imaging articles and methods using dual-axis retroreflective elements
First Claim
Patent Images
1. An optical imaging article comprising:
- a first side comprising a plurality of first dual-axis retroreflective elements located in a first plane, each of the first dual-axis retroreflective elements being generally aligned with a first axis, the first side further comprising a plurality of planar transmissive first surfaces oriented parallel to the first plane; and
a second side comprising a plurality of second dual-axis retroreflective elements located in a second plane and aligned with a second axis, the second side further comprising a plurality of reflective planar second surfaces oriented parallel to the second plane, the second dual-axis retroreflective elements being spaced from the first side, wherein the first and second axes are generally perpendicular to each other.
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Abstract
Imaging articles and methods are disclosed that use dual-axis retroreflective elements such as 90 degree prisms and linear lenticular elements in which the imaging is either superimposed on the imaged object or displaced therefrom. If the imaging is superimposed on the imaged object, it is accomplished by retroreflection. If the imaging is displaced from the imaged object, it may be accomplished by dual axis retroreflection or retrotransmission.
34 Citations
25 Claims
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1. An optical imaging article comprising:
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a first side comprising a plurality of first dual-axis retroreflective elements located in a first plane, each of the first dual-axis retroreflective elements being generally aligned with a first axis, the first side further comprising a plurality of planar transmissive first surfaces oriented parallel to the first plane; and a second side comprising a plurality of second dual-axis retroreflective elements located in a second plane and aligned with a second axis, the second side further comprising a plurality of reflective planar second surfaces oriented parallel to the second plane, the second dual-axis retroreflective elements being spaced from the first side, wherein the first and second axes are generally perpendicular to each other. - View Dependent Claims (2, 3, 4, 5)
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6. A pavement marker comprising:
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a first side comprising a plurality of first dual-axis retroreflective elements located in a first plane, each of the first dual-axis retroreflective elements being generally aligned with a first axis, the first side further comprising a plurality of planar reflective first surfaces oriented parallel to the first plane; a second side located opposite the first side, the second side comprising a plurality of second dual-axis retroreflective elements located in a second plane and aligned with a second axis, wherein the second plane is parallel to the first plane and the first and second axes are generally perpendicular to each other; and a first optical window located between the first and second sides, the optical window transmitting at least a portion of light incident thereon and refracting the light towards one of the first and second sides. - View Dependent Claims (7, 8, 9)
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10. An optical imaging article comprising:
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a first side comprising a plurality of dual-axis retroreflective elements located in a first plane, each of the dual-axis retroreflective elements being generally aligned with a first axis, the first side further comprising at least one planar reflective first surface oriented parallel to the first plane; and an opposing prism comprising a linear peak and a pair of surfaces oriented perpendicular to each other, the linear peak of the prism being spaced from the first side and generally aligned with a second axis, wherein the first and second axes are generally perpendicular to each other. - View Dependent Claims (11, 12, 13)
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14. An optical imaging article comprising:
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a first side comprising a plurality of first dual-axis retroreflective elements located in a first plane, each of the first dual-axis retroreflective elements being generally aligned with a first axis, the first side further comprising a plurality of planar transmissive first surfaces oriented parallel to the first plane; and a second side reflecting a portion of light incident thereon and transmitting a portion of light incident thereon. - View Dependent Claims (15, 16, 17)
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18. An optical imaging article comprising:
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a first side comprising a plurality of first dual-axis retroreflective elements located in a first plane, each of the first dual-axis retroreflective elements being generally aligned with a first axis, the first side further comprising a plurality of planar first surfaces oriented parallel to the first plane; and a second side comprising a plurality of second dual-axis retroreflective elements located in a second plane and aligned with a second axis, the second side further comprising a plurality of planar second surfaces oriented parallel to the second plane, the second dual-axis retroreflective elements being spaced from the first side, wherein the first and second axes are generally perpendicular to each other. - View Dependent Claims (19, 20, 21)
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22. An imaging device comprising:
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a first optical surface comprising a plurality of first dual-axis retroreflective elements located in a first plane, the plurality of first dual-axis retroreflective elements being generally aligned with a first axis and generally perpendicular to a second axis; and a second optical surface comprising a plurality of second dual-axis retroreflective elements located in a second plane, the plurality of second dual-axis retroreflective elements being generally aligned with a third axis and generally perpendicular to a fourth axis; wherein the second axis lies in a plane that is generally parallel to third axis, and further wherein the fourth axis lies in a plane that is generally parallel to the first axis, and still further wherein the first plane intersects the second plane; whereby a portion of light from an object that is directed in a first direction towards the first optical surface is reflected by the first dual-axis retroreflective elements towards the second optical surface where it is reflected by the second dual-axis retroreflective elements in a second direction to form an image of the object.
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23. A method of retroreflective superimposed imaging comprising:
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a) providing an optical imaging article comprising; a first side comprising a plurality of first dual-axis retroreflective elements located in a first plane, each of the first dual-axis retroreflective elements being generally aligned with a first axis, the first side further comprising a plurality of planar transmissive first surfaces oriented parallel to the first plane; and a second side comprising a plurality of second dual-axis retroreflective elements located in a second plane and aligned with a second axis, the second side further comprising a plurality of reflective planar second surfaces oriented parallel to the second plane, the second dual-axis retroreflective elements being spaced from the first side, wherein the first and second axes are generally perpendicular to each other; b) directing light at the optical imaging article from an object; and c) observing a retroreflected image of the object.
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24. A method of retroreflective superimposed imaging comprising:
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a) providing an optical imaging article comprising; a first side comprising a plurality of dual-axis retroreflective elements located in a first plane, each of the dual-axis retroreflective elements being generally aligned with a first axis, the first side further comprising at least one planar reflective first surface oriented parallel to the first plane; and an opposing prism comprising a linear peak and a pair of surfaces oriented perpendicular to each other, the linear peak of the prism being spaced from the first side and generally aligned with a second axis, wherein the first and second axes are generally perpendicular to each other; b) directing light at the optical imaging article from an object; and c) observing a retroreflected image of the object. - View Dependent Claims (25)
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Specification