Patent ID: 7370681

Claim:
A substrate bonding apparatus used in fabricating LCD devices, comprising: a base frame; an upper chamber unit; a lower chamber unit mounted to the base frame, wherein the lower chamber unit is selectively connectable with the upper chamber unit; chamber moving means for raising and lowering the upper chamber unit; an upper stage mounted to the upper chamber unit; a lower stage mounted to the lower chamber unit; sealing means provided to a surface of one of the upper or lower chamber units; first alignment means for leveling the upper stage with respect to the lower stage; and second alignment means for horizontally aligning the upper stage with respect to the lower stage, and at least one receiving groove arranged within an upper surface of the lower chamber unit for receiving a respective first shaft, wherein the first alignment means includes: at least one first actuator fixed to the upper chamber unit; at least one first shaft fixed to a respective first actuator, wherein an end portion of the first shaft is moveable with respect to the upper chamber unit; and sensing means for sensing a contact between each first shaft and the lower chamber unit.