FIELD EMISSION CATHODE, AND FIELD EMISSION TYPE ILLUMINATION DEVICE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a field emission cathode with high energy conversion rate, useful for environment protection, and a field emission type illumination device using the same.

SOLUTION: The field emission cathode has a carbon nano-tube yarn drawn out from carbon nano-tube array, and the field emission cathode can be formed by one piece of carbon nano-tube yarn or by a plurality of carbon nano-tube yarns wound together. The field emission type illumination device has the field emission cathode and an anode facing the field emission cathode. Since the energy conversion of the field emission type illumination device is carried out only through a conversion process from electric energy to photo-energy, energy conversion rate is high. Furthermore, the field emission type illumination device is useful for environment protection.

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