Patent ID: 11967487
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 3:
4. A forming method of a placing table for use in a plasma processing apparatus, the forming method of the placing table comprising:
a first process of forming, while spreading only a source material of a first ceramic on a stage, a base by irradiating an ultraviolet ray to the source material of the first ceramic such that the source material of the first ceramic is melted and solidified;
a second process of forming, while spreading only the source material of the first ceramic and a source material of a second ceramic different from the first ceramic on the base on the stage, a boundary layer on the base by irradiating the ultraviolet ray to the source material of the first ceramic and the source material of the second ceramic such that the source material of the first ceramic and the source material of the second ceramic are melted and solidified; and
a third process of forming, while spreading only the source material of the second ceramic on the stage, a ceramic layer by irradiating the ultraviolet ray to the source material of the second ceramic such that the source material of the second ceramic is melted and solidified,
wherein in the second process, the source material of the first ceramic and the source material of the second ceramic are spread on the stage in a horizontal direction while a mixing ratio between the source material of the first ceramic and the source material of the second ceramic is being changed.