Dynamic adjustment of a sampling rate for an optical encoder
First Claim
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1. A method of dynamically adjusting a sampling rate of an optical encoder in an electronic device, the optical encoder including an optical sensor comprising multiple light sensing elements, the method comprising:
- sampling signals from two or more light sensing elements at a first time and determining a first phase offset;
sampling signals from the two or more light sensing elements at a second time and determining a second phase offset; and
adjusting the sampling rate of the two or more light sensing elements based on the first and second phase offsets.
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Abstract
A light source in a rotary optical encoder can illuminate a pattern on a rotatable shaft and an optical sensor can detect either the light that is reflected or transmitted based on the pattern. A sampling rate of the optical sensor is dynamically adjusted based on a rotational speed of the rotatable shaft. A pulse rate of the light source may also be dynamically adjusted based on the sampling rate of the optical sensor.
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Citations
20 Claims
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1. A method of dynamically adjusting a sampling rate of an optical encoder in an electronic device, the optical encoder including an optical sensor comprising multiple light sensing elements, the method comprising:
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sampling signals from two or more light sensing elements at a first time and determining a first phase offset; sampling signals from the two or more light sensing elements at a second time and determining a second phase offset; and adjusting the sampling rate of the two or more light sensing elements based on the first and second phase offsets. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electronic device, comprising:
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a rotatable shaft having a patterned surface; a light source positioned adjacent to the rotatable shaft and configured to illuminate the patterned surface; an optical sensor comprising a plurality of light sensing elements positioned adjacent to the rotatable shaft and configured to receive at least a portion of light reflected off the patterned surface; and a sampling rate control module operably connected to the optical sensor and configured to; sample signals from two or more light sensing elements at a first time and determining a first phase offset; sample signals from the two or more light sensing elements at a second time and determining a second phase offset; and adjust a sampling rate of the optical encoder based on the first and second phase offsets. - View Dependent Claims (14, 15, 16, 17)
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18. A non-transitory computer-readable medium having stored thereon executable instructions which, when executed by a processing device, causes the processing device to perform a method of dynamically adjusting a sampling rate of an optical encoder, the method comprising:
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sampling signals from two or more light sensing elements in an optical sensor at a first time and determining a first phase offset; sampling signals from the two or more light sensing elements at a second time and determining a second phase offset; and adjusting a sampling rate of the optical sensor based on the first and second phase offsets. - View Dependent Claims (19, 20)
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Specification