Patent ID: 6966817

Claim:
A wafer grinder, comprising: a base structure: a housing module, including a holding body, the housing module being fixedly positioned on the base structure of the wafer grinder; a rotary worktable module, including a worktable body and a spindle rotatably positioned on the wafer grinder, wherein the rotary worktable module includes a wafer holding sub-module; an air pressure protection bearing module, positioned on the holding body and including an air channel to direct an airflow with a certain pressure to the housing module and the rotary worktable module to act as an air cushion spindle to support the worktable body and the spindle; and an adjustment module, positioned on the holding body and including a piezoelectric actuator and a displacement meter; wherein a longitudinal rotation between the spindle and the worktable body includes an air padding to offset a lateral force during a grinding process.