Patent ID: 8958722
Filing Date: 2015-02-17
Classification: G03G

Abstract:
1. An extractor for separating and extracting a dispersoid and a dispersion medium from a liquid sample containing the dispersoid and the dispersion medium, comprising: a first roller that carries a thin layer of the liquid developer containing the dispersoid and the dispersion medium on a circumferential surface thereof and rotates about a shaft; a thickness adjusting device for adjusting a thickness of the thin layer on the first roller; a separating member held in contact with the first roller and adapted to separate the dispersion medium from the thin layer carried on the first roller; a charger for charging the dispersoid in the thin layer carried on the first roller at a position upstream of a contact position of the separating member with the first roller with respect to a rotating direction of the first roller; an electric field generator for generating an electric field for causing the charged dispersoid to be attracted to the circumferential surface of the first roller; a density detector for detecting a density of the dispersoid in the liquid sample; a liquid tank for storing the liquid sample; and a thin layer forming member for forming the thin layer of the liquid sample on the circumferential surface of the first roller using the liquid sample in the liquid tank, wherein: the thickness adjusting device causes the thin layer having a first thickness to be formed on the first roller when the density detector detects the density of the dispersoid to be a first density while causing the thin layer having a second thickness smaller than the first thickness by a predetermined value or more to be formed on the first roller when the density detector detects the density of the dispersoid to be a second density higher than the first density by a predetermined value or more, the thin layer forming member is a second roller that is so arranged that a circumferential surface thereof is in contact with the liquid sample in the liquid tank, rotates about a shaft and conveys the liquid sample along the circumferential surface thereof; the thickness adjusting device is a nip adjusting device for adjusting a nip depth of the first and second rollers; and the nip adjusting device sets the nip depth of the first and second rollers at a predetermined first depth when the first density is detected while setting the nip depth of the first and second rollers at a second depth larger than the first depth by a predetermined value when the second density is detected.