Corrective lens for copying books
OwnerCharles C. Taiinventor
Life of this patent
Estimating the term…
Abstract
An improved corrective lens for copying pages of a book pressed flat upon a document support glass of a xerographic copying machine or document scanner. The corrective lens is shaped to fit in the space between the book pages to be copied and the document glass of the copier. The corrective lens has a pyramidal center extending into the crease of a typical book. The lens extends outwardly from the pyramidal center to form substantially flat side portions that hold the pages of the open book in place.
Claims22
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;
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- 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.
A portable, freely disposable, 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, movable lens element for placement over various sizes of open books, said transparent element having a mid-portion that fits within, and when pressed against the open book, contours to, a crease thereof 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;
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- 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.
Dependencies are inferred from the claim text.