Optical navigation sensor with variable tracking resolution
First Claim
1. A method of sensing motion of an optical sensor relative to a surface, the method comprising:
- setting a first resolution and a second resolution;
obtaining measurement signals from a sensor array; and
tracking the motion of the optical sensor relative to the surface using the measurement signals,wherein the tracking of the motion in a first dimension is performed at the first resolution, and the tracking of the motion in a second dimension is performed at the second resolution,wherein the tracking of the motion in the first dimension is performed using a first division operation, and wherein the tracking of the motion in the second dimension is performed using a second division operation, andwherein the first division operation comprises dividing a measured displacement along the first dimension by a first divisor to obtain a first output and a first remainder, and wherein the second division operation comprises dividing a measured displacement along the second dimension by a second divisor to obtain a second output and a second remainder.
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Accused Products
Abstract
One embodiment relates to a method of sensing motion of an optical sensor relative to a surface. A first resolution and a second resolution are set. Measurement signals are obtained from a sensor array, and the motion of the optical sensor relative to the surface is tracked using the measurement signals. The tracking of the motion in a first dimension is performed at the first resolution, and the tracking of the motion in a second dimension is performed at the second resolution. Another embodiment relates to an optical sensor apparatus for sensing motion relative to a surface, wherein the tracking of the motion is performed at a variable resolution along each of two axes. Other embodiments and features are also disclosed.
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Citations
15 Claims
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1. A method of sensing motion of an optical sensor relative to a surface, the method comprising:
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setting a first resolution and a second resolution; obtaining measurement signals from a sensor array; and tracking the motion of the optical sensor relative to the surface using the measurement signals, wherein the tracking of the motion in a first dimension is performed at the first resolution, and the tracking of the motion in a second dimension is performed at the second resolution, wherein the tracking of the motion in the first dimension is performed using a first division operation, and wherein the tracking of the motion in the second dimension is performed using a second division operation, and wherein the first division operation comprises dividing a measured displacement along the first dimension by a first divisor to obtain a first output and a first remainder, and wherein the second division operation comprises dividing a measured displacement along the second dimension by a second divisor to obtain a second output and a second remainder. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
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a sensor array for generating first analog differential signals in response to displacement of an optical sensor relative to a surface in at least a first dimension (x) for a current frame (i); analog-to-digital conversion circuitry for converting the first analog differential signals to digital signals to obtain to a first measured digital signal (Mx,i); and data processing circuitry configured to add a remainder (Rx,i−
1) from a previous frame (i−
1) to the first measured digital signal (Mx,i) to obtain a first adjusted digital signal for the current frame (′
Mx,i) and to divide the first adjusted digital signal (′
Mx,i) by a first divisor (Dx) to obtain a first displacement output (Ox) in the first dimension and a first remainder for the current frame (Rx,i). - View Dependent Claims (12, 13, 14, 15)
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Specification