Negative ion generator

Details Negative ion generator Negative ion generator

2002-06-19

2004-03-09

Vu, David (Department: 2821)

Electric lamp and discharge devices: systems

Discharge device load with fluent material supply to the...

Electron or ion source

C310S318000

Reexamination Certificate

active

06703785

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to negative ion generators for adequately generating negative ions by negatively charging gas molecules, such as oxygen molecules or fine particles in air.
2. Prior Art
Recently, negative ions are attracting attention in that they can provide a good influence on the living body, such as a healthy effect of preventing oxidization of the human body, an effect of holding the freshness of foodstuff and a deodorizing effect. Various types of negative ion generators are thus present, which can generate negative ions by negatively charging gas molecules, such as oxygen molecules and fine particles in air. A high voltage generation circuit in such a negative ion generator uses a ferrite high voltage transformer, which has a coil wound on an iron core, and performs electromagnetic coupling amplification by electromagnetic induction.
However, the high voltage transformer of coil type in the prior art negative ion generator generates an electromagnetic wave when performing the electromagnetic coupling amplification, and this electromagnetic wave is a cause of generating positive ions, which have adverse effects, such as oxidizing effects, on the living body. In other words, the prior art negative ion generator has a contradiction that despite it generates negative ions, it also generates a considerable number of positive ions, which cancel negative ions and have adverse effects, such as oxidizing the living body. In addition, limitations are imposed on the size and thickness reduction of the coil type high voltage transformer because of such reasons as the necessity of ensuring breakdown voltage. Therefore, it has been impossible to meet market demands for size and thickness reduction of the negative ion generator for the mounting thereof in various apparatuses. Furthermore, in order that the quantity of generated negative ions is variable, a voltage varying circuit for varying the drive voltage inputted to the transformer is necessary, and the number of circuit components is inevitably increased.
SUMMARY OF THE INVENTION
The invention, accordingly, has an object of providing a negative ion generator, which can suppress the generation of positive ions, permits ready control of the quantity of generated negative ions and permits size and thickness reduction. To attain this object, an electron emission type negative ion generator is provided which emits electrons into air when a negative high voltage is impressed on stylus electric discharge electrode. This negative ion generator uses a piezoelectric transformer for amplifying a non-rectified drive voltage from a transformer drive circuit. An AC high voltage from the piezoelectric transformer is rectified to obtain a negative high voltage, which is impressed on the stylus electric discharge electrode for electron emission wherefrom, thereby generating negative ions in air.


REFERENCES:
patent: 5923542 (1999-07-01), Sasaki et al.
patent: 10-199654 (1998-07-01), None
patent: 11-299254 (1999-10-01), None
patent: 2001-85189 (2001-03-01), None
patent: 2001-102195 (2001-04-01), None

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