High-efficiency cathode-ray tubes for dry-process recording

Typically, dry-process-recording media is sensitive only in the ultraviolet (UV) region of the spectrum, where current phosphors and faceplate glasses are either inadequate or unavailable. Thus, it was considered necessary to develop new phosphors and fiber-optic faceplates for incorporation in high-resolution cathode-ray tubes (CRTs) to be used for these dry-process real-time-recording applications. Two rugged UV phosphors, which emit radiation centered near 320 nm and 380 nm, are joined with newly developed fiber-optic faceplates to produce CRTs that may be used to write on almost any of the mentioned recording media. Up to tenfold improvement in writing speed on appropriate media is shown to be possible.