Prism fiber reading tube and thin film electron-beam penetration printing tube for fast facsimile transmission

A prism fiber reading tube and a thin film electron-beam penetration printing tube, for fast fast facsimile have been developed. The prism fiber reading tube features a new type of prism-shaped glass fiber which makes direct contact reading possible. This newly-developed reading tube is capable of reading opaque original manuscript, a procedure not possible with an ordinary fiber optics tube. By electron scanning, a manuscript can be read at television scanning speeds. The resolution obtained is about 6 lines/mm and the light efficiency is about 5 times as high as that of a conventional flying-spot scanner using an F/1 lens with unity magnification.