Patent ID: 6665128
Filing Date: 2003-12-16
Classification: G03G

Abstract:
A corrective lens that yields substantially undistorted copies of adjacent open book pages presented for xerographic copying or document scanning upon a document support glass of a copier or scanner, comprising:a) a substantially transparent element for placement over various sizes of open books, said transparent element having a mid-portion that fits within, and contours to, a crease of the open book adjacent a binding thereof, said mid-portion of said transparent element having local focal length changing means, comprising a top surface formed by two sections of a nearly cylindrical curvilinear surface and a bottom surface formed by two sections of a higher-order skewed hyperbolic-like curvilinear surface, for changing its focal point at each location on the lens based on the varying distance between the book pages residing on the lens's top surface and the copier's document supporting glass across the said crease, in order to present a substantially non-blurred and undistorted image of said edge of each adjacent page of said open book as it lies upon a document support glass of said copier; and b) integral extension arms extending outwardly from said mid-portion to cover the entire or part of the remainder of the open book and hold said pages in place.