| 摘要 |
An optical navigation system is provided to sense relative movement between the system and a surface. Generally, the system includes: (i) an illuminator having a light source to illuminate a portion of the surface; (ii) a detector to receive light reflected from the portion of the surface; and (iii) an enclosure enclosing the illuminator and the detector, the enclosure having a window covering the detector and through which light reflected from the portion of the surface is transmitted to the detector, the window being substantially transparent to at least one wavelength of light emitted by the light source. In certain embodiments, the window is a filter-window that is substantially non-transparent to light from other sources, such as ambient light, having shorter or longer wavelengths. Other embodiments are also described.
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