By Robert Durbeck (Eds.)
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66 is by far the most popular for CRTs. 66 NA plate is about 81°. 35 NA can be used where the material cannot be in contact with the faceplate and thus must be spaced off a fraction of a millimeter, or other applications where it is desirable to have a restricted angle. 10 shows, in simplified form, the steps necessary to make a typical fiber optic plate. In actual practice, more than one “draw” is usually employed after the fibers are stacked in hexagonal form. The finished faceplate is attached to the tube envelope with a relatively low melting point powdered glass called frit.
Fiber optic coupling not only eliminates the space required for an optical path, making the system much more com pact, but also provides a light transfer efficiency on the order of 30 times that of an ordinary lens. Therefore, it is possible to expose less sensitive media, including dry process emulsions such as the 3M dry silver and photo-conductive material (Wurtz, 1980a). 8 shows a comparison between a conventional lens and a fiber optic system. Each fiber in a fiber optic plate is made up of two glasses: one for the core and one for the cladding.
Some systems, particu larly those utilizing fiber optic tubes on conventional films, use only a fraction of a microamp of beam current. Without using unusual techniques, the practical state of the art in CRT spot size in a 125 mm diameter tube is about 16 microns. This is measured in a scientific fashion at a relatively low beam current (less than 1 mi croamp). Among other things, this size is achieved by using small apertures in the beam path. Thus the spot is made smaller at the expense of the amount of current which does not get to excite the phosphor.
Output Hardcopy Devices by Robert Durbeck (Eds.)