FIELD EMISSION DEVICE AND NANOFIBER MANUFACTURING DEVICE

摘要

Disclosed herein is a field emission device which makes mass-production of nanofiber having satisfactory performance possible. The field emission device (20) includes a casing (100), a collector (150), a nozzle block (110) and a power supply (160). A positive electrode of the power supply (160) is connected to the collector (150), and a negative electrode of the power supply (160) is connected to the nozzle block (110) and the casing (100). When the collector (150) is viewed from the nozzle block (110), a periphery of an insulator (152) is closer to the outside of the device than a periphery of the collector (150). When the thickness of the insulator is ”Œa”˜ and the distance between the periphery of the insulator and the periphery of the collector is ”Œb”˜, both ”Œa ‰¥ 6mm”˜ and ”Œa + b ‰¥ 50mm”˜ are satisfied.