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|1. (WO2017195723) PARTICLE CHARGING DEVICE|
NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
|Title:||PARTICLE CHARGING DEVICE|
In the present invention, an inlet unit (2), wherethrough a carrier gas containing particles to be charged is introduced to the interior of a housing (1), and an outlet unit (3), wherethrough charged particles are extracted, are provided so as to oppose one another on a straight line. An ion generating element (6) is disposed in the vicinity of the inlet unit (2) exit. Ring-shaped electrodes (7) are disposed between this element (6) and the outlet unit (3), forming a direct current electric field whereby charged particles are accelerated toward the outlet unit (3). Particles in the carrier gas enter into contact with and are charged by gas ions generated by the ion generating element (6) to become monovalent charged particles, and immediately upon becoming charged, are affected by the direct current electric field and are accelerated toward the outlet unit (3). In this manner, the monovalent charged particles immediately leave a mixed region (8) in which gas ions are present in high concentration such that the opportunity of entering into contact again with a gas ion is slim, and multivalent charging is suppressed. In addition, since the ion generating element (6) carries out single electrode charging, the charging efficiency is satisfactory. This allows monovalent charged particles to be extracted efficiently.