Patent ID: 7780780

Claim:
A method of producing organic pigment fine particles, comprising: allowing two or more solutions at least one of which is an organic pigment solution in which an organic pigment is dissolved to flow through a microchannel in a non-laminar state; and depositing organic pigment fine particles from the organic pigment solution in a course of flowing; wherein the organic pigment is flowed through a first channel joining a mixing channel, and a second channel joins with the mixing channel, said second channel flowing a second one of the two or more solutions, which is not the organic pigment solution, wherein the first and second channels intersect the mixing channel at angles a, β, respectively, such that S 1 >S 2 is satisfied, wherein S 1 is a sum of cross-sectional areas in a thickness direction of the first and second channels at the intersection of the mixing channel, and S 2 is a cross-sectional area of the mixing channel.