Patent ID: 7195024

Claim:
A substrate cleaning apparatus comprising: a chemical treatment chamber in which a substrate is cleaned with a mixture solution; and a chemical supply system for supplying said mixture solution to said chemical treatment chamber, wherein said mixture solution includes a liquid chemical mixed and diluted with a solvent, and said chemical supply system includes: at least one chemical reservoir that is easy to carry, in which said liquid chemical is stored at a high concentration; a piping system in which said solvent flows, wherein said piping system includes a discharge portion for said mixture solution at an end thereof; a chemical supplier feeding out a predetermined quantity of said liquid chemical from said chemical reservoir into a connecting pipe; and a chemical discharger connecting said connecting pipe to said piping system and arranged to discharge said liquid chemical from said connecting pipe into said solvent in the piping system at a linear velocity that is significantly greater than a linear velocity of said solvent to produce said mixture solution at a desired uniform concentration.