Optical positioning device using telecentric imaging
First Claim
1. 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 comprising:
- an illuminator configured to illuminate a portion of the surface;
object-side telecentric imaging optics configured to image the optical features emanating from the illuminated portion of the surface; and
an array of photosensitive elements configured to detect intensity data relating to the optical features imaged by the object-side telecentric imaging optics.
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Accused Products
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.
106 Citations
20 Claims
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1. 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 comprising:
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an illuminator configured to illuminate a portion of the surface;
object-side telecentric imaging optics configured to image the optical features emanating from the illuminated portion of the surface; and
an array of photosensitive elements 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, 14)
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15. A method of sensing movement of a data input device across a surface, the method comprising:
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illuminating a portion of the surface;
mapping images of the illuminated portion of the surface to an array of photosensitive elements using telecentric imaging optics on an object side; and
determining displacement of optical features 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 (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 focus a speckle pattern from the illuminated portion of the surface to the array of photosensitive elements; 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