# US 5,707,692 A · Apparatus and method for processing a base substance using plasma and a magnetic field > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,692 A - Document ID: US5707692A - Status: Granted - Kind: A - Application number: 08/320,551 - Filed: 1994-10-11 - Granted: 1998-01-13 - Earliest claimed: 1990-10-23 - Assignees: Canon Kabushiki Kaisha - Inventors: Nobumasa Suzuki - Web page: https://patentgrep.com/patent/US5707692A ## CPC - H01J 37/32091: {the radio frequency energy being capacitively coupled to the plasma} - C23C 16/507: using external electrodes, e.g. in tunnel type reactors - C23C 16/517: using a combination of discharges covered by two or more of groups C23C16/503 - C23C16/515 - H01J 37/3266: {Magnetic control means} - H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H) - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) ## Abstract A plasma processing apparatus for processing a base substance installed within a processing chamber into which predetermined gases are flowed and which is maintained at a predetermined pressure by producing a plasma within said processing chamber is characterized by comprising plasma producing means for producing the plasma within said processing chamber including at least two ground electrodes provided on external peripheries of said processing chamber, and an rf electrode provided on external periphery of said processing chamber between said two ground electrodes, and magnetic field producing means for producing a magnetic field orthogonal to an electric field formed by said plasma producing means. ## Claims ### Claim 1 A plasma processing apparatus for processing a base substance installed within a processing chamber into which a gas for use in a plasma process is introduced and maintained at a pressure of 0.001 to 1 Torr, comprising: plasma producing means for producing a plasma within said processing chamber including two ground electrodes and one rf electrode provided on an external periphery surrounding said processing chamber, said rf electrode being disposed between said two ground electrodes; magnetic field producing means comprising a first and a second magnet for producing a mirror magnetic field orthogonal to an rf electric field between said ground electrodes which is formed by said plasma producing means, wherein said first and second magnets are arranged on the external periphery surrounding said chamber so as to sandwich said two ground and one rf electrodes, thereby confining plasma produced by said plasma producing means substantially within a plasma generating space within the vicinity of said electrodes as determined by said rf electric field and said magnetic field; and supporting means for supporting said base substance, wherein said supporting means supports said base substance at a sufficient distance from said plasma generating space to be in a region of lower plasma density than said plasma generating space. ### Claim 2 (depends on 1) The plasma producing apparatus according to claim 1, further comprising light source means for emitting light having a wavelength absorbable into said base substance or gas molecules sticking to said base substance or reaction intermediates onto said covered base substance. ### Claim 3 (depends on 1) An apparatus according to claim 1, wherein said magnets comprise electromagnets. ### Claim 4 (depends on 1) An apparatus according to claim 1, wherein said magnets comprise permanent magnets. ### Claim 5 A plasma processing apparatus for processing a base substance installed within a processing chamber into which a gas for use in plasma processing is introduced and maintained at a pressure between 0.001 and 1 Torr, comprising: plasma producing means for producing a plasma within said processing chamber two ground electrodes and one rf electrode provided on an external periphery surrounding said processing chamber, said rf electrode being disposed between said two ground electrodes; and magnetic field producing means provided along an external periphery of said rf electrode for producing a magnetron magnetic field orthogonal to an electric field formed by said plasma producing means. ### Claim 6 (depends on 5) The plasma producing apparatus according to claim 5, further comprising light source means for emitting a light having a wavelength absorbable into said base substance or gas molecules sticking to said base substance or reaction intermediates onto said covered base substance. ### Claim 7 (depends on 5) An apparatus according to claim 5, wherein said magnets comprise electromagnets. ### Claim 8 (depends on 5) An apparatus according to claim 5, wherein said magnets comprise permanent magnets. ### Claim 9 A plasma processing method for processing a base substance installed within a processing chamber of an apparatus into which a gas for use in plasma processing is introduced and maintained at a pressure between 0.001 and 1 Torr, comprising: introducing said gas into said processing chamber, having (I) plasma producing means for producing a plasma within the processing chamber including two ground electrodes and one rf electrode provided on an external periphery surrounding said processing chamber, said rf electrode being disposed between said two ground electrodes, and (ii) magnetic field producing means comprising a first and a second magnet arranged on an external periphery surrounding said chamber so as to sandwich said two ground and one rf electrodes, for producing a mirror magnetic field orthogonal to an rf electric field which is formed by said plasma producing means; producing the plasma from said gas substantially within a plasma generating space inside said processing chamber with said plasma producing means; processing said base substance using said plasma; and wherein said base substance is disposed at a sufficient distance from said plasma generating space to be in a region of lower plasma density than said plasma generating space. ### Claim 10 (depends on 9) The plasma processing method according to claim 9, further comprising forming a thin film on said base substance. ### Claim 11 (depends on 9) The plasma processing method according to claim 9, further comprising reforming a surface of said base substance. ### Claim 12 (depends on 9) The plasma processing method according to claim 9, further comprising removing a surface of said base substance or extraneous matters on the surface of said base substance. ### Claim 13 (depends on 9) A method according to claim 9, wherein said magnets comprise electromagnets. ### Claim 14 (depends on 7) A method according to claim 7, wherein said magnets comprise permanent magnets. ### Claim 15 (depends on 9) A method according to claim 9, wherein said base substance is at least arranged adjacent to said plasma processing means within said processing chamber, and is subjected to processing in a low plasma density region less than or equal to 5.times.10.sup.8 /cm.sup.3. ### Claim 16 A plasma processing method for processing a base substance installed within a processing chamber of an apparatus into which a gas for use in plasma processing is introduced and maintained at a pressure between 0.001 and 1 Torr, comprising: introducing said gas into said processing chamber, having (I) plasma producing means for producing plasma within the processing chamber including two ground electrodes and one rf electrode provided on an external periphery surrounding said processing chamber, said rf electrode being disposed between said two ground electrodes, and (ii) magnetic field producing means, arranged along an external periphery of said rf electrode, for producing a magnetron magnetic field orthogonal to an electric field formed by said plasma producing means; producing the plasma from said gas substantially within a plasma generating space inside said processing chamber with said plasma producing means; and processing said base substance using said plasma, wherein said base substance is disposed at a sufficient distance from said plasma generating space to be in a region of lower plasma density than said plasma generating space. ### Claim 17 (depends on 16) The plasma processing method according to claim 16, further comprising forming a thin film on said base substance. ### Claim 18 (depends on 16) The plasma processing method according to claim 16, further comprising removing a surface of said base substance. ### Claim 19 (depends on 16) The plasma processing method according to claim 16, further comprising removing a surface of said based substance or extraneous matters on the surface of said base substance. ### Claim 20 (depends on 16) A method according to claim 16, wherein said magnets comprise electromagnets. ### Claim 21 (depends on 16) A method according to claim 16, wherein said magnets comprise permanent magnets. ### Claim 22 (depends on 16) A method according to claim 16, wherein said base substance is at least arranged adjacent to said plasma processing means within said processing chamber, and is subjected to processing in a low plasma density region less than or equal to 5.times.10.sup.8 /cm.sup.3.