Patent ID: 11969767
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC B  H | IPC B  H

Claim 11:
12. A wafer cleaning device, comprising:
a liquid inlet pipe having an inlet terminal and an outlet terminal, the outlet terminal being arranged facing a wafer to be cleaned, a wall of the liquid inlet pipe being protruded outward to form a protrusion, the protrusion having a cavity in communication with an inside of the liquid inlet pipe;
a first liquid discharge pipe, one terminal of the first liquid discharge pipe being in communication with the cavity and a second terminal of the first liquid discharge pipe being in communication with a container;
a first valve, arranged on the liquid inlet pipe and located between the protrusion and the outlet terminal;
a liquid supply device, in communication with the inlet terminal to import cleaning solution into the liquid inlet pipe;
a second liquid discharge pipe, one terminal of the second liquid discharge pipe being in communication with the liquid inlet pipe and a second terminal of the second liquid discharge pipe being in communication with the container, a diameter of the second liquid discharge pipe being less than a diameter of the liquid inlet pipe, wherein the diameter of the second liquid discharge pipe is less than a diameter of the first liquid discharge pipe, and the diameter of the first liquid discharge pipe is less than the diameter of the liquid inlet pipe;
a second valve, arranged on the first liquid discharge pipe and located between a connection and the container, the connection being a connection of the second liquid discharge pipe and the first liquid discharge pipe;
a photoelectric sensing device, arranged in a preset region of the first liquid discharge pipe, the first liquid discharge pipe being a transparent pipe, the photoelectric sensing device being configured to detect luminous flux of the preset region; and
a controller, configured to control the first valve to close and the second valve to open when the luminous flux is less than a preset value, and control the first valve to open and the second valve to close when the luminous flux is greater than the preset value.