Patent ID: 6034668
Filing Date: 2000-03-07
Classification: G06F

Abstract:
An optical grating for use in a cursor control device, comprising:a first row having two or more types of optical segments, wherein a first type of optical segment represents a first logical state and a second type of optical segment represents a second logical state;a second row of optical segments, the second row having optical segments of the first type and optical segments of the second type, wherein the first row and the second row are approximately equal in length, and wherein the second row is disposed adjacent to the first row such that a first end of the first row is adjacent to a first end of the second row and a second end of the first row is adjacent to a second end of the second row;wherein the optical segments at the first ends of the first and second rows are both of the first type, and further wherein the optical segments at the second ends of the first and second rows are, respectively, of the second and first types.