Source: http://www.google.com/patents/US6823816?dq=inassignee:integral+inassignee:peripherals
Timestamp: 2016-02-12 10:46:05
Document Index: 570767920

Matched Legal Cases: ['art 23', 'art 23', 'art 34', 'art 34', 'art 23', 'art 23', 'art 23']

Patent US6823816 - Plasma processing system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsAn electromagnetic wave absorber (4) of a material that causes a large dielectric or magnetic loss is disposed so as to surround a region between a high-frequency wave transmitting window (3) and an antenna (32) to suppress the formation of a sanding wave by suppressing the reflection of microwaves....http://www.google.com/patents/US6823816?utm_source=gb-gplus-sharePatent US6823816 - Plasma processing systemAdvanced Patent SearchPublication numberUS6823816 B2Publication typeGrantApplication numberUS 10/642,268Publication dateNov 30, 2004Filing dateAug 18, 2003Priority dateNov 30, 1999Fee statusPaidAlso published asUS6622650, US20010036465, US20040069229Publication number10642268, 642268, US 6823816 B2, US 6823816B2, US-B2-6823816, US6823816 B2, US6823816B2InventorsNobuo Ishii, Yasuyoshi YasakaOriginal AssigneeTokyo Electron Limited, Yasuyoshi Yasaka, Makoto AndoExport CitationBiBTeX, EndNote, RefManPatent Citations (3), Referenced by (9), Classifications (7), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetPlasma processing system
US 6823816 B2Abstract
What is claimed is: 1. A plasma processing system that propagates plasma-producing radio-frequency waves generated by a radio-frequency power supply system through a flat antenna and a radio-frequency wave transmitting window into a vacuum vessel, produces a plasma by ionizing a process gas supplied into the vacuum vessel by the energy of the radio-frequency waves and processes a substrate placed on a substrate table arranged in the vacuum vessel with the plasma;
wherein an electromagnetic wave absorber is disposed so as to surround a region between a surface of the radio-frequency wave transmitting window on a side of a vacuum atmosphere in the vacuum vessel and the antenna. 2. The plasma processing system according to claim 1, wherein the electromagnetic wave absorber is divided into a plurality of divisions, the divisions are arranged at circumferential intervals with spaces formed between the adjacent divisions.
The microwave transmitting window 3 is surrounded by a cylindrical part 23 formed continuously with an upper end part of the vacuum vessel 1 and serving as an electromagnetic shield. The upper end surface of the cylindrical part 23 is flush with the upper surface of the expanded part 34. The expanded part 34 is fitted in the cylindrical part 23. The cylindrical part 23 is lined with an electromagnetic wave absorber 4 capable of absorbing microwaves. The electromagnetic wave absorber 4 suppresses the reflection of microwaves to suppress the formation of a standing wave. The electromagnetic wave absorber 4 may be formed of a dielectric material that causes a large dielectric loss, such as a resistor containing carbon, or water, for example, Nikoraito� (Nippon Kosyuha Kabusiki Kaisha), a magnetic material, such as a ferritic ceramic material, or a combination of some of those materials. When using water as the electromagnetic absorber 4, a cylindrical jacket is formed on the inner circumference of the cylindrical part 23 so as to surround a microwave propagation region, an inner wall of the jacket on the side of the microwave propagation region is formed of a glass plate and water is supplied into the jacket.
εr=εr1 �x+ε r2�(1−x)
The circular member 61 may be extended through the microwave transmitting window 3 or may be attached to the lower surface of the antenna 32. A ring-shaped member may be used instead of the circular member 61. It is preferable that the diameter of the circular member 62 or the inside diameter of the ring employed in stead of the circular member 61 meet an inequality: λ/2≦Diameter (Inside diameter)<λ. The gas supply pipe 65 and the tube 33 a form a coaxial waveguide for microwaves. Since microwaves propagate through this waveguide, it is preferable to surround the gas supply pipe 65 by a shielding member of a diameter greater than the inside diameter of the tube 33 a. When a plasma is produced, a cease area is formed in a space of, for example, about 1 cm in thickness is formed under the lower surface of the microwave transmitting window 3. The gas supply device 6 is formed in a size that permits the gas supply device 6 to be included in the cease area. The circular member 61 and the annular member 62 of the gas supply device 6 divides a microwave propagation region to suppress the formation of a standing wave. Therefore, the circular member 61 and the annular member 62 are formed such that the radial distance Q between the circular member 61 and the annular member 62 meets an inequality: λ/2≦Q<λ.
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