NEGATIVE ION GENERATING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a negative ion generating method by which the generation of negative ion from a photoelectron releasing material is made from the whole surface of the photoelectron releasing material. SOLUTION: In the method for generating the negative ion by irradiating the photoelectron releasing material 3 disposed at the whole surface of a gas passage with UV rays 2, the irradiation of the UV rays is performed so that the whole surface of the photoelectron releasing material may have a fixed concentration of higher and the irradiation of the UV rays is performed by using plural UV lamps and germicidal lamps may be used for the UV lamps.