Abstract: A novel semiconductor device is provided. A memory string, which extends in the Z direction and includes a conductor and an oxide semiconductor, intersects with a plurality of wirings CG extending in the Y direction. The conductor is placed along a center axis of the memory string, and the oxide semiconductor is concentrically placed outside the conductor. The conductor is electrically connected to the oxide semiconductor. An intersection portion of the memory string and the wiring CG functions as a transistor. In addition, the intersection portion functions as a memory cell.

Abstract: A laser beam emitted from a laser element is received by a laser receiver. The soot deposition process is carried out by controlling a growing shoot deposition surface at a constant specified position based upon information carried by the received laser beam. The laser receiver is provided with a filter for absorbing heat rays generated by a burner flame and a heat shielding plate made of material having a high heat resistance to prevent the temperature of the receiver from rising. The receiver is also cooled with a stream of cooling gas. The above-described arrangement can prevent the occurrence of malfunction of the sensor portion due to its temperature rise and assures the reliable position control of the soot deposition, achieving a high accuracy of the soot perform produced.