| 摘要 |
A device for hardening a surface or surface layer, especially a viscous, preferably printed surface layer, such as a coat of paint, using electron beams, includes a thin-film field emission cathode (10) having a plurality of electron-emitting cones (16) for generating the beams. The cathode (10) comprises several oblong, flat lamellae units arranged in a line end to end on a ceramic backing with the apexes (20) of the cones (16) in one plane (17), and is housed within an evacuated tubular casing (22) opposite an electron escape window (23) in the casing (22). Two tape-shaped control electrodes (24 and 24') are housed in the interior (21) of the casing (22) as well. The cathode has an extended area and the distribution of electron-emitting cones may vary over different regions thereof (Fig. 4, not shown). As shown in Fig. 3, each Mo cone 16 is provided on Si layer 13 in a cavity 18 in SiO2 layer 14 which is covered by apertured Mo layer 15. <IMAGE> |
