Patent ID: 7120007

Claim:
An ion generating unit comprising: a dielectric base having a length and carrying a needle electrode and a ground electrode, said needle electrode having a pointed tip and being adapted to receive a high electric voltage relative to said ground electrode for electrically charging particles present in the surrounding air, said needle electrode having a voltage terminal for electrical connection with a voltage output of a high voltage generating circuit, said ground electrode having a ground terminal for electrical connection with a ground of said high voltage generating circuit; said dielectric base being a polyhedron having multiple faces including a first face and a second face which are different from each other and have the length of said dielectric base, said needle electrode being mounted on or in a closely adjacent relation to said first face, said needle electrode having its pointed tip directing forwardly along the length of said dielectric base with said pointed tip receded from the front end of said dielectric base, said ground electrode being mounted at said front end of said dielectric base in longitudinally spaced relation with said pointed tip of said needle electrode, and said ground electrode having anchor ends which are fixed to said second face in such a manner that said ground electrode is secured to said dielectric base only by said anchor ends, one of said anchor ends being with said ground terminal, wherein said base includes a generally flat plate defining said first and second faces respectively on the upper and lower faces thereof; said dielectric base further including a pair of side ribs integrally upstanding from lateral edges of said plate, said ground electrode is an arched member with a pair of inward bents that extend integrally from the lower ends of the arched member to define said anchor ends, said inward bents being fixed to said lower face of said plate with the lower ends of said arched member routing outwardly of said side ribs, respectively.