DEVICE FOR CARRYING THIN PLATE-LIKE SUBSTRATE

摘要

A device for carrying a thin plate-like substrate such as a semiconductor wafer and controlling its position by floating it with an inert gas of low impurity concentration. A transferring unit and a controlling unit are respectively provided with gas nozzles for floating a thin plate-like substrate and with a gas exhausting and circulating system, and a plurality of them are in combination with each other in a sealing state. The controlling unit, further, has a vacuum suction hole at its controlling center, and is provided with nozzles for controlling the thin plate-like substrate in its radial and cirumferential direction respectively and with nozzles for stopping the thin plate-like substrate or sending out it to the next unit too. On the bottom face of a control space, grooves extending from the vacuum suction hole are formed for improving the positional accuracy of stopping the thin plate-like substrate, and they are closed on the insides of their circumferential parts when the center of the thin plate-like substrate has coincided with the controlling center of the controlling unit.