Method and apparatus for regulating air ionization

Details Method and apparatus for regulating air ionization Method and apparatus for regulating air ionization

1988-07-20

1990-08-21

Pellinen, A. D.

Electricity: electrical systems and devices

Discharging or preventing accumulation of electric charge

By charged gas irradiation

361231, 361235, H05F 306

Patent

active

049511726

ABSTRACT:
Ion content of the atmosphere at a particular location is controlled by generating ions during repetitive period that are initiated by timing signals which reoccur at a predetermined rate. An ion sensor produces feedback signals indicative of the ion content of the air and a feedback circuit varies the duration of the recurring periods of ion generation, if necessary, to maintain the ion content within a predetermined range. Positive and negative ions may be generated during alternate ones of the repetitive periods in which case the feedback circuit inversely varies the periods of positive and negative ion generation to maintain the relative proportions of the two types of ion within a predetermined range. The method and apparatus may be used to suppress accumulation of electrostatic charge by objects, such as in a clean room where electronic components are manufactured, or for other purposes requiring control of the ion content of air.

REFERENCES:
patent: 2264495 (1941-12-01), Wilner
patent: 3624448 (1971-11-01), Saurenman
patent: 3936698 (1976-02-01), Meyer
patent: 4542434 (1985-09-01), Gehlke et al.
patent: 4630167 (1986-12-01), Huggins
patent: 4757422 (1988-07-01), Bossard et al.
patent: 4809127 (1989-02-01), Steinman et al.
R. H. Dunphy et al., "A Computer Controlled Air Ionizing System", date not known but prior to Oct. 17, 1985.
Voyager Technologies, Inc., "Computer Controlled Air Ionization", Date not known but prior to Oct. 17, 1985.

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