Classifier and method for preparing toner

1. Field of the Invention A classifier is proposed which includes a dispersion chamber for dispersing a powder material therein, a classification chamber connected to the dispersion chamber, and a conical member disposed between the dispersion chamber and the classification chamber, wherein the dispersion chamber includes a particle residence prevention member for preventing the powder material from residing within the dispersion chamber by changing the speed of the cyclonic flow of the powder material in the dispersion chamber so as to be decreased in the direction of the feed inlet within the dispersion chamber, and a method of preparing toner by use of the classifier is also proposed.