Optical positioning device resistant to speckle fading
First Claim
1. An optical positioning apparatus configured to be resistant to speckle fading, the apparatus comprising:
- a coherent light source for illuminating a surface with laser light;
a detector configured to obtain a succession of data frames of the illuminated surface, wherein the detector comprises N rows, each row including a plurality of photosensitive elements.
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Accused Products
Abstract
One embodiment disclosed pertains to an optical positioning apparatus configured to be resistant to speckle fading. The apparatus includes at least a coherent light source and a detector. The coherent light source is configured to illuminate a surface with laser light. The detector is configured to obtain a succession of data frames of the illuminated surface, and the detector comprises N rows each including a plurality of photosensitive elements. Another embodiment disclosed pertains to an optical positioning apparatus configured to be resistant to speckle fading using calculating and filtering circuitry. The calculating circuitry is configured to calculate velocity data from the intensity data. The filtering circuitry is configured to reduce effects from speckle fading in the velocity data. Other embodiments are also described.
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Citations
20 Claims
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1. An optical positioning apparatus configured to be resistant to speckle fading, the apparatus comprising:
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a coherent light source for illuminating a surface with laser light;
a detector configured to obtain a succession of data frames of the illuminated surface, wherein the detector comprises N rows, each row including a plurality of photosensitive elements. - View Dependent Claims (2, 3)
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4. An optical positioning apparatus configured to be resistant to speckle fading, the apparatus comprising:
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a coherent light source for illuminating a surface with laser light;
a detector configured to obtain a succession of intensity data frames from the illuminated surface; and
calculating circuitry configured to calculate velocity data from the intensity data; and
filtering circuitry configured to reduce effects from speckle fading in the velocity data. - View Dependent Claims (5, 6)
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7. An optical displacement sensor for sensing relative movement between a data input device and a surface by determining displacement of optical features in a succession of images of the surface, the sensor comprising:
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a detector having a first array including multiple rows of photosensitive elements arranged parallel to a first axis, each row including a plurality of sets of photosensitive elements, each set having a number M of photosensitive elements; and
wherein signals from each of the photosensitive elements in a set are electrically coupled with corresponding photosensitive elements in other sets to produce M independent group signals from M interlaced groups of photosensitive elements. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of sensing movement of a data input device across a surface, the method comprising:
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providing an optical displacement sensor having a detector with a first array of a plurality of rows of photosensitive elements arranged parallel to a first axis, each row including multiple sets of photosensitive elements, each set having a number M of photosensitive elements;
receiving on the first array an intensity pattern produced by light reflected from a portion of the surface; and
electrically coupling signals from each of the photosensitive elements in a set with corresponding photosensitive elements in other sets to produce M independent group signals from M interlaced groups of photosensitive elements in the first array. - View Dependent Claims (20)
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Specification