Optical accelerometers
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United States of America Patent
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Mar 15, 2016
Grant Date -
Oct 3, 2013
app pub date -
Apr 1, 2013
filing date -
Apr 2, 2012
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Abstract
Optical accelerometers may be provided that detect acceleration in up to six axes. An optical accelerometer may include an image sensor and optical elements such as light pipes that extend over the image sensor. Light may be injected into the optical elements by a light source. The optical elements may guide the light onto corresponding portions of an image pixel array on the image sensor. The image pixels may be used to detect changes in the location, size, and intensity of illuminated portions of the pixel array when the optical elements move due to acceleration of the optical accelerometer. The optical accelerometer may include multiple light pipes having various lengths and thicknesses. Light pipes of matching length and thickness may be formed over opposing sides of a pixel array. The light pipes may be coated with a material that responds to electric or magnetic fields.
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