Patent ID: 9663859
Date: 2017-05-30
CPC Classifications: C23C,G01B,G01D,H01L

Claim:
1. A deposition apparatus comprising: a gas distribution assembly having a front surface, a back surface and an edge; a susceptor assembly spaced from the gas distribution assembly to rotate a plurality of substrates around a central axis, the susceptor assembly having a top surface with a plurality of recesses to hold a plurality of substrates, a bottom surface and an edge, wherein the top surface of the susceptor assembly and the front surface of the gas distribution assembly defining a gap; a camera having a field of view including the edge of the susceptor assembly; a controller connected to the camera to determine the gap between the top surface of the susceptor assembly and the front surface of the gas distribution assembly; and a hardstop having a hardstop body with a top portion with a top end, a bottom portion with a bottom end and an opening extending from the top end to the bottom end, the top portion of the hardstop comprising a flange; an actuator having an actuator body with an upper portion with an upper end and a lower portion with a lower end, the upper portion having a passage extending through the actuator body, the passage having a first end and a second end, the actuator sized to be slidably positioned within the opening of the hardstop so that the lower end of the actuator protrudes from the bottom end of the hardstop a first distance when no force is applied to the lower end of the actuator; an emitter aligned with the first end of the passage in the actuator; a detector aligned with the second end of the passage in the actuator; a spring positioned adjacent the top end of the actuator and a plate positioned adjacent the spring, wherein the plate is bolted to the flange of the hardstop and provides pressure to the spring, the flange on the hardstop is connected to the back surface of the gas distribution assembly and the bottom end of the hardstop extends through the gas distribution assembly and protrudes from the front surface of the gas distribution assembly.