# US 7,612,981 B2 · Ion generator and neutralizer

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- Number: US 7,612,981 B2
- Document ID: US7612981B2
- Status: Granted
- Kind: B2
- Application number: 12/010,928
- Filed: 2008-01-31
- Published: 2008-08-14
- Granted: 2009-11-03
- Earliest claimed: 2007-02-09
- Assignees: National Institute of Advanced Industrial Science and Technology; FISA Corporation
- Inventors: Takafumi Seto; Makoto Hirasawa; Yasufumi Hozumi; Masaaki Tsuji; Akira Okuyama; Susumu Saito
- Web page: https://patentgrep.com/patent/US7612981B2

## CPC

- A61L 9/22: Ionisation
- H01T 23/00: Apparatus for generating ions to be introduced into non-enclosed gases, e.g. into the atmosphere
- A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K)
- H01T: SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES (overvoltage protection circuits H02H)

## Abstract

The present invention is relating to an ion generator and an ionizer, in which the ion generator can obtain stable ion generation even if the electrode and the power supply slightly change, satisfies voltage and frequency conditions for realizing an ozone concentration less than 50 ppb as an allowable concentration. The ion generator of the present invention is characterized as 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, and the relationship between the voltage V and the frequency f satisfies a specific parameter. And, the ionizer of the present invention is characterized that ionization is performed by using the above mentioned fan-type ion generator.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

The fan-type ion generator according to claim 1, designed so as to satisfy the following formula (11) at a distance of 300 millimeters from the discharge electrode when the airflow rate is defined as u:
t
n
=
5
×
10
6
uC
ion
≤
2
⁢
⁢
seconds
Equation
⁢
⁢
11
In the equation, tn: ionization characteristic time.

### Claim 3 (depends on 1)

A fan-type ionizer which performs ionization by using the fan-type ion generator according to claim 1.