Optical Encoder
First Claim
1. An optical encoder for measuring movement, the optical encoder comprising:
- at least one light source for outputting light,a movable pattern; and
at least one photodetector for detecting the light reflected off the movable pattern, the movable pattern comprising regions of varying reflectivity for modulating the light from the at least one light source onto the at least one photodetector in response to movement of the pattern, wherein the at least one photodetector is configured to detect the light at a detection rate comprising detection instants in regular intervals.
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Accused Products
Abstract
The present invention relates to an optical encoder for measuring movement. The optical encoder includes at least one light source for outputting light. Furthermore, the optical encoder includes a movable pattern. Furthermore, the optical encoder includes at least one photodetector for detecting the light reflected off the movable pattern, the movable pattern including regions of varying reflectivity for modulating the light from the at least one light source onto the at least one photodetector in response to movement of the pattern, wherein the at least one photodetector is configured to detect the light in detection instants in regular intervals. The light source may be a pulsed light source outputting light in pulses. Furthermore, user equipment including such an optical encoder and a method for measuring movement are disclosed.
24 Citations
27 Claims
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1. An optical encoder for measuring movement, the optical encoder comprising:
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at least one light source for outputting light, a movable pattern; and at least one photodetector for detecting the light reflected off the movable pattern, the movable pattern comprising regions of varying reflectivity for modulating the light from the at least one light source onto the at least one photodetector in response to movement of the pattern, wherein the at least one photodetector is configured to detect the light at a detection rate comprising detection instants in regular intervals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 20)
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17. An optical encoder for measuring movement, the optical encoder configured to:
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output light from at least one light source; move a movable pattern positioned relative to the at least one light source, the pattern comprising regions of varying reflectivity; modulate the light from the at least one light source onto at least one photodetector in response to movement of the pattern; and detect the light reflected off the movable pattern in the at least one photodetector at a detection rate comprising detection instants in regular intervals.
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19. User equipment comprising an optical encoder for measuring movement, the optical encoder comprising:
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at least one light source for outputting light, a movable pattern; and at least one photodetector for detecting the light reflected off the movable pattern, the movable pattern comprising regions of varying reflectivity for modulating the light from the at least one light source onto the at least one photodetector in response to movement of the pattern, wherein the at least one photodetector is configured to detect the light at a detection rate comprising detection instants in regular intervals.
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21. Method for measuring movement, the method comprising:
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outputting light from at least one light source; moving a movable pattern positioned relative to the at least one light source, the pattern comprising regions of varying reflectivity; modulating the light from the at least one light source onto a photodetector in response to movement of the pattern; and detecting the light reflected off the movable pattern in the at least one photodetector at a detection rate comprising detection instants in regular intervals. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification