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US 8,558,163 B2Granted
Optical navigation system having a filter-window to seal an enclosure thereof
AssigneeCypress Semiconductor Corporation
InventorHarold Zarem
Life of this patent
Estimating the term…
Abstract
An optical navigation system and method are provided. In one embodiment, the system includes: (i) a coherent light source to emit light to illuminate a portion of a finger; and (ii) a detector to receive light reflected from the portion of the finger, the detector including a speckle-based sensor configured to sense movement of the finger relative to the detector based on changes in a complex interference pattern created by the light reflected from the portion of the finger. Other embodiments are also described.
Claims19
An optical navigation system comprising:
- a coherent light source to emit light to illuminate a portion of a finger;
- a window covering the light source so that light emitted from the light source is transmitted through the window to illuminate the portion of the finger;
- and
- a detector to receive through the window light reflected from the portion of the finger, the detector including a speckle-based sensor configured to sense movement of the finger relative to the detector based on changes in a complex interference pattern created by the light reflected from the portion of the finger.
1 more element
An optical navigation system comprising:
- a coherent light source to emit light to illuminate a portion of a surface
- a detector to receive light reflected from the portion of the surface, the detector including a speckle-based sensor configured to sense movement of the surface relative to the detector based on changes in a complex interference pattern created by the light reflected from the portion of the surface;
- and
- a filter-window through which light reflected from the portion of the surface is transmitted to the detector, the filter-window comprising a first filter and a second filter substantially non-transparent to light having wavelengths other than a wavelength of light emitted from the light source.
1 more element
A method comprising:
- illuminating through a window a portion of a finger touching the window using a coherent light source;
- and
- detecting, at a detector, a complex interference pattern created by light reflected from the illuminated portion of the finger through the window;
- and
- detecting movement of the finger relative to the detector based on changes in the detected complex interference pattern created by the light reflected from the illuminated portion of the finger.
2 more elements
Dependencies are inferred from the claim text.