Optical mouse
AssigneeSunplus Innovation Technology Inc.
InventorChi-Chun Chu
Life of this patent
Estimating the term…
Abstract
An optical mouse is provided with a light guide. The light guide has a collecting surface, a single reflection surface and an exit surface, guiding a light of a light source to a tracking surface through three interface engagements of a refraction, a reflection and a refraction, so as to reduce optical power loss caused by too many interface engagements, and to increase a gazing angle of the light incident to the tracking surface. An array of micro-lenses, as a light diffuser, can be set on the exit surface to improve optical characteristics and distribution of the light incident to the tracking surface.
Claims6
An optical mouse comprising:
- a base with an opening;
- a light source installed on the base along an axis for generating an initial light;
- a light guide installed on the base at a location corresponding to the opening, having a collecting surface, a reflection surface and an exit surface, the collecting surface aligning along a first direction and refracting the initial light to the reflection surface along a straight line to form a reflection light wherein the first direction is perpendicular to the axis and the reflection surface forms a prism surface;
- the reflection surface reflecting the reflection light to the exit surface along a straight line to form an incident light wherein the exit surface locates on a bottom side of the light guide and parallels the base with a norm direction perpendicular to the axis;
- and the exit surface refracting the incident light through the opening to a tracking surface;
- and
- a sensor receiving the incident light reflected by the tracking surface as a reference for determination of a movement of the optical mouse.
Dependencies are inferred from the claim text.