Patent ID: 8704153

Claim:
An optical navigation module for receiving control from an object disposed on an operation plane, the optical navigation module comprising: a substrate defining a base plane that is perpendicular to the operation plane; a light source installed on the base plane of the substrate and configured to project light to a side of the substrate; an optical structure installed at the side of the substrate; a light sensor installed on the base plane of the substrate; a light shield installed on the base plane of the substrate spatially separating the light source and the light sensor so that light projected by the light source is not directly shed on the light sensor, the light shield having an aperture formed thereon; and a tactile switch for executing a command installed at a side of the light source that is opposite to the side facing the operation plane; wherein: the optical structure is configured to guide the light projected from the light source to the object so that at least a portion of the light scattered by the object passes to the light sensor through the aperture on the light shield and forms a speckle pattern on the light sensor; and wherein the optical structure comprises only one slanted surface without a second or more slanted surfaces configured for bending the light from the light source toward the object at the operation plane.