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

Claim 8:
9. The wafer cleaning device of claim 8, further comprising:
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.