Optical positioning device using telecentric imaging
First Claim
1. An apparatus, comprising:
- an illuminator configured to illuminate a portion of a surface using a coherent light source;
object-side telecentric imaging optics configured to reduce speckle boiling of optical features of a speckle pattern generated by the coherent light source and emanating from the illuminated portion of the surface; and
an array of photosensitive elements comprising a comb array, wherein the array of photosensitive elements is configured to detect intensity data relating to the optical features imaged by the object-side telecentric imaging optics.
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Abstract
One embodiment relates to an optical displacement sensor for sensing movement of a data input device across a surface by determining displacement of optical features in a succession of frames. The sensor includes at least an illuminator, telecentric imaging optics on the object (scattering surface) side, and an array of photosensitive elements. The illuminator is configured to illuminate a portion of the surface. The telecentric imaging optics is configured to image the optical features emanating from the illuminated portion of the surface, and the array of photosensitive elements is configured to detect intensity data relating to the optical features imaged by the telecentric imaging optics. Other embodiments are also disclosed.
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Citations
20 Claims
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1. An apparatus, comprising:
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an illuminator configured to illuminate a portion of a surface using a coherent light source; object-side telecentric imaging optics configured to reduce speckle boiling of optical features of a speckle pattern generated by the coherent light source and emanating from the illuminated portion of the surface; and an array of photosensitive elements comprising a comb array, wherein the array of photosensitive elements is configured to detect intensity data relating to the optical features imaged by the object-side telecentric imaging optics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method comprising:
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illuminating a portion of a surface using coherent light; reducing speckle boiling of a speckle pattern generated by the coherent light using object-side telecentric imaging optics; mapping images of the speckle pattern to an array of photosensitive elements comprising a comb array using the telecentric imaging optics; and determining displacement of optical features of the speckle pattern emanating from the illuminated portion of the surface in a succession of frames to sense movement of the data input device across the surface in at least one dimension. - View Dependent Claims (15, 16, 17)
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18. An optical positioning device comprising:
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a laser configured to illuminate a portion of the surface; an array of photosensitive elements; telecentric imaging optics on an object side configured to reduce speckle boiling of a speckle pattern from the illuminated portion of the surface and to focus the speckle pattern to the array of photosensitive elements, wherein the array of photosensitive elements comprises a comb array; and a signal processor configured to determine displacement of the speckle pattern in a succession of frames. - View Dependent Claims (19, 20)
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Specification