Two-dimensional motion sensor
First Claim
1. An optical sensor for sensing relative movement between the sensor and a surface by detecting changes in optical features in a pattern of light reflected from the surface, the sensor including a two dimensional (2D) array of photosensitive elements comprising at least:
- a first plurality of photosensitive elements arranged and coupled to select a 2D spatial frequency of the pattern created by light reflected from the surface and to generate in response thereto a first signal which is a function of movements along a first set of at least two non-parallel axes by algebraically combining outputs from each of the first plurality of photosensitive elements; and
a second plurality of photosensitive elements arranged and coupled to select a 2D spatial frequency of the pattern created by light reflected from the surface and to generate in response thereto a second signal which is a function of movements along a second set of at least two non-parallel axes by algebraically combining outputs from each of the second plurality of photosensitive elements.
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Accused Products
Abstract
An optical sensor and method of using the same is provided for sensing relative movement between the sensor and a surface by detecting changes in optical features of light reflected from the surface. In one embodiment, the sensor includes a two dimensional array of photosensitive elements, the array including at least a first plurality of photosensitive elements arranged and coupled to sense a first combined movement along a first set of at least two non-parallel axes, and a second plurality of photosensitive elements arranged and coupled to sense a second combined movement along a second set of a least two non-parallel axes.
62 Citations
20 Claims
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1. An optical sensor for sensing relative movement between the sensor and a surface by detecting changes in optical features in a pattern of light reflected from the surface, the sensor including a two dimensional (2D) array of photosensitive elements comprising at least:
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a first plurality of photosensitive elements arranged and coupled to select a 2D spatial frequency of the pattern created by light reflected from the surface and to generate in response thereto a first signal which is a function of movements along a first set of at least two non-parallel axes by algebraically combining outputs from each of the first plurality of photosensitive elements; and a second plurality of photosensitive elements arranged and coupled to select a 2D spatial frequency of the pattern created by light reflected from the surface and to generate in response thereto a second signal which is a function of movements along a second set of at least two non-parallel axes by algebraically combining outputs from each of the second plurality of photosensitive elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical sensor for sensing relative movement between the sensor and a surface by detecting changes in optical features of light reflected from the surface, the sensor including a two dimensional (2D) array of photosensitive elements, the array comprising at least:
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a first plurality of photosensitive elements arranged and coupled to generate a first analog signal in response to light reflected thereon from the surface which is a function of movements along a first set of at least two non-parallel axes by algebraically combining outputs from each of the first plurality of photosensitive elements; and a second plurality of photosensitive elements arranged and coupled to generate a second analog signal in response to light reflected thereon from the surface which is a function of movements along a second set of at least two non-parallel axes by algebraically combining outputs from each of the second plurality of photosensitive elements. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of sensing displacement of an optical sensor relative to a surface, the optical sensor comprising a two-dimensional (2D) array including at least a first plurality of photosensitive elements and a second plurality of photosensitive elements, the method comprising steps of:
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illuminating a portion of the surface; receiving light reflected from the illuminated portion of the surface on the 2D array; sensing with the first plurality of photosensitive elements movement in at least two directions and generating in response thereto a first signal which is a function of movements along a first set of at least two non-parallel axes by algebraically combining outputs from each of the first plurality of photosensitive elements; sensing with the second plurality of photosensitive elements movement in at least two directions and generating in response thereto a second signal which is a function of movements along a second set of at least two non-parallel axes by algebraically combining outputs from each of the second plurality of photosensitive elements; and combining the first and second signals to produce output signals representing relative movement between the sensor and the surface. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification