Patent ID: 7229521

Claim:
An etching system, comprising: an etching chamber, an etchant solution tank providing etchant solution into the etching chamber; a heater used to heat the etchant solution tank; and a deionized water adding device, comprising: a deionizcd water feeding pipe positioned in the tank having a first timer, and providing deionized water into the etching chamber; and a clean dry air feeding pipe having a second timer, and providing clean dry air into the etching chamber; wherein, the deionized water feeding pipe and the clean dry air feeding pipe are connected with the etching chamber, opening and closing of the deionized water feeding pipe and the clean dry air feeding pipe are controlled by the first timer and the second timer respectively, and a portion of the deionized water feeding pipe and the etchant solution in the etchant solution tank are both heated by the heater.