Patent ID: 8425718

Claim:
A wet etching apparatus, comprising: a silicon slice holder for horizontally holding a masked silicon slice, a motor for rotating the masked silicon slice at a constant speed, an etchant vessel having etchant therein for receiving the masked silicon slice therein, a connector connecting the silicon slice holder with the motor, wherein the connector comprises a straight pole, a spring, a bearing and a hook connected one after another, wherein the straight pole is connected with the motor, and the hook is connected with the silicon holder, wherein when the spring is fully relaxed, the silicon slice holder is above the etchant, and when the spring is stretched, the masked silicon slice is completely immersed into the etchant without the silicon slice holder touching the etchant vessel, so as to freely rotate the silicon slice holder in the etchant vessel; a supporting frame connected with the motor for supporting the motor and the silicon slice holder, and an inert gas cylinder injecting inert gas to the etchant vessel for agitating the etchant in the etchant vessel.