| 摘要 |
An optical navigation device detects relative motion of non-optically flat surfaces, e.g. fingers by comparing the captured images of the surface texture, e.g. ridges on the finger. Within a housing 8 a light source 10 and a sensor array 12 are positioned proximately. The sensor array 12 is mounted on a substrate 13. A lens array 14 interposes the surface 20 to be imaged and the sensor array 12 such that a 1:1 image of the surface, e.g. finger surface of the user onto the 2D sensor array, is formed. The micro-lenses may be designed to match individual pixels on the sensor array, or the each element of the lens array is used to cover a group of pixels on the sensor. The micro-lenses may be positioned such that the image is formed onto the sensor array or formed in a plane in space such that the image is defocused from the surface.
|
