Patent ID: 6428879
Filing Date: 2002-08-06
Classification: B41J,Y10T

Abstract:
An optical encoder strip with dimensional stability and ink resistance properties comprising:a clear thin polymer film element having a length, width, surfaces, and thickness; said element having a region located between the lengthwise ends, with a plurality of registration markings including an integer number of opaque registration line segments per linear distance that are generally parallel to each other and equidistantly spaced apart along an edge of the element, alternating with generally transparent spaces; a clear coating having a thickness between about 2 microns and about 4 microns adhered to and substantially uniformly covering the surfaces of the element sufficiently to substantially exclude moisture from absorbing into the element; wherein the coating is configured on the element as translucent to one or more light wavelengths and is adapted to : (1) substantially prevent ink absorption into the element or adsorption to the surface of the element; and (2) provide dimensional stability to the element resulting from interaction of heat and moisture.