Optical encoder based on light-steering based contrast generation from a first plurality of primary convex mirror sections and a second plurality of secondary mirror sections
First Claim
1. An apparatus comprising:
- an light source configured to transmit light toward a rotatable optical encoder;
the rotatable optical encoder having a first surface, where the first surface comprises a specularly reflective material, and a surface shape of the first surface is configured to generate a modulated pattern of brightness in light from the light source specularly reflected by the first surface, the first surface comprising;
a first plurality of primary convex mirror sections configured to reflect incident light toward bright portions of the modulated pattern of brightness and away from dark portions of the modulated pattern of brightness; and
a second plurality of secondary mirror sections having a second surface shape different from the plurality of convex mirror sections wherein light reflected from the secondary mirror sections overlaps with light reflected from the primary convex mirror sections.
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Abstract
In some examples, an optical encoder may consist of a light source that shines light onto a wheel which then reflects the light onto a sensor. Using information encoded in the reflected light, the rotation of the wheel may be determined. In some examples, rotation of the wheel may be determined by detecting an encoding pattern in light reflected from an exterior surface of the wheel. In some examples, the encoding pattern can be a pattern of light and dark stripes. In some examples, a pattern of light stripes can be generated from light reflecting off of reflective portions of the wheel. Some examples of the disclosure relate to using a surface topology for a wheel that can be used to generate an encoding pattern of light and dark stripes in light reflected from the surface of the wheel, even when the surface of the wheel is uniformly reflective.
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Citations
22 Claims
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1. An apparatus comprising:
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an light source configured to transmit light toward a rotatable optical encoder; the rotatable optical encoder having a first surface, where the first surface comprises a specularly reflective material, and a surface shape of the first surface is configured to generate a modulated pattern of brightness in light from the light source specularly reflected by the first surface, the first surface comprising; a first plurality of primary convex mirror sections configured to reflect incident light toward bright portions of the modulated pattern of brightness and away from dark portions of the modulated pattern of brightness; and a second plurality of secondary mirror sections having a second surface shape different from the plurality of convex mirror sections wherein light reflected from the secondary mirror sections overlaps with light reflected from the primary convex mirror sections. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus comprising:
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a light source; a light sensor; and a rotatable optical encoder configured to reflect light from the light source onto the light sensor, the rotatable optical encoder having a first circumferential surface having a first surface topology, the first surface topology comprising a first plurality of reflective sections and a second plurality of reflective sections configured to reflect light from the light source onto the sensor in a modulated brightness pattern indicative of rotational movement of the rotatable optical encoder, wherein the first plurality of reflective sections are configured to reflect light along a radial axis of the rotatable optical encoder and the second plurality of reflective sections are configured to reflect light along a second axis, different from the radial axis of the rotatable optical encoder such that the light reflected by the second plurality of reflective sections overlaps with the light reflected by the first plurality of reflective sections in a bright portion of the modulated brightness pattern. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification