| 主权项 |
1. An optical finger navigation device comprising:
a navigation cover which comprises a tracking surface and an illumination surface, wherein the tracking surface exhibits a first light reflection characteristic in a presence of a navigation object at the tracking surface and a second light reflection characteristic in an absence of the navigation object at the tracking surface; a light source to generate illumination directed toward the illumination surface of the navigation cover; and a first redirection structure interposed between the light source and the illumination surface of the navigation cover, wherein a reflection surface of the first redirection structure is approximately facing the illumination surface of the navigation cover, and an illumination surface of the first redirection structure is approximately facing the light source, wherein the first redirection structure defines at least one hole there through to pass light generated by the light source toward the illumination surface of the navigation cover; a second redirection structure located within a path of the light reflected by the reflection surface of the first redirection structure, wherein the second redirection structure comprises a reflection surface to redirect the light from the direction that is approximately parallel to the tracking surface; and an image sensor to receive the light reflected from the reflection surface of the second redirection structure, wherein the image sensor is approximately parallel to the navigation cover. |
