| US 7,612,981 B2 | ||
| Ion generator and neutralizer | ||
| Takafumi Seto, Tsukuba (Japan); Makoto Hirasawa, Tsukuba (Japan); Yasufumi Hozumi, Tsukuba (Japan); Masaaki Tsuji, Tsukuba (Japan); Akira Okuyama, Tokyo (Japan); and Susumu Saito, Tokyo (Japan) | ||
| Assigned to National Institute of Advanced Industrial Science & Technology, Tokyo (Japan); and FISA Corporation, Tokyo (Japan) | ||
| Filed on Jan. 31, 2008, as Appl. No. 12/10,928. | ||
| Claims priority of application No. P2007-030524 (JP), filed on Feb. 09, 2007. | ||
| Prior Publication US 2008/0191146 A1, Aug. 14, 2008 | ||
| Int. Cl. H01T 23/00 (2006.01); G03G 15/02 (2006.01); H05F 3/00 (2006.01) | ||
| U.S. Cl. 361—230 [361/235] | 3 Claims |
| 1. A fan-type ion generator including a dielectric body, a discharge electrode having fine protrusions arranged on the surface
of this dielectric body, and an induction electrode arranged on the back surface of the dielectric body, comprising:
an ion element in which by applying a sinusoidal AC high voltage to the discharge electrode, a potential difference from the
induction electrode is generated, plasma is formed on the surface of the dielectric body, and positive ions, negative ions,
and ozone are produced according to air ionization; and
a fan which generates an airflow with respect to the discharge electrode, wherein
the peak-to-peak voltage is not less than 3.5 kV and not more than 7 kV, the frequency f satisfies the following equation
7, and the relationship between the voltage V and the frequency f satisfies the following equation 10:
Cion=CionS−1.07×106 exp(−Kionf)≧0.8×106 Equation 7
CO3=f×1.0×10−4 exp(Vp-p/1000)≤50 ppb Equation 10
In the equations, Cion: concentration of positive or negative ions, Cions: balanced ion concentration, Kion: extinction coefficient, CO3: ozone concentration.
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