Sealing part and substrate processing apparatus

1. A sealing part in a substrate processing apparatus that has a reduced pressure vessel in which is present a high-elasticity polymeric material-eroding eroding substance and carries out predetermined processing on a substrate housed in the reduced pressure vessel, the sealing part sealing an inside of the reduced pressure vessel from an outside, the sealing part comprising:

a first member that is disposed on an inside side of the reduced pressure vessel and is resistant to the eroding substance, the first member comprising a substantially U-shaped cross section that opens out on the outside side of the pressure vessel and has at least one narrow portion which bends for promoting compressive deformation thereof;

a second member made of the high-elasticity polymeric material that is disposed on an outside side of the reduced pressure vessel; and

at least one predetermined space formed between at least part of said first member and at least part of said second member;

wherein at least part of said second member enters into an opening of said U-shaped cross section of said first member,

wherein said at least one predetermined space is an enclosed space formed by contacting said first member and said second member with each other in at least two portions, the enclosed space being disposed inside said first member, and

wherein said at least one predetermined space shrinks when said first member and said second member are compressed.

2. A sealing part as claimed in claim 1 , wherein said U-shaped cross section of said first member has at least three bending portions including at least one pair of narrow portions that are provided symmetrically regarding a symmetry plane including a center of said U-shaped cross section.

3. A sealing part as claimed in claim 1 , wherein the eroding substance is an active species produced from a reactive active gas, and said first member is made of a fluororesin.

4. A sealing part as claimed in claim 3 , wherein said fluororesin is one selected from the group consisting of polytetrafluoroethylene, a tetrafluoroethylene/perfluoroalkyl vinyl ether copolymer, a tetrafluoroethylene/hexafluoropropylene copolymer, a tetrafluoroethylene/ethylene copolymer, polyvinylidene fluoride, and polychlorotrifluoroethylene.

5. A sealing part as claimed in claim 3 , wherein said high-elasticity polymeric material is one selected from the group consisting of vinylidene fluoride type rubber, and tetrafluoroethylene-propylene type rubber.

6. A sealing part as claimed in claim 1 , wherein the eroding substance is a corrosive gas, and said first member is made of a corrosion-resistant metal.

7. A sealing part as claimed in claim 6 , wherein said corrosion-resistant metal is one selected from the group consisting of stainless steel, nickel, and aluminum.

8. A sealing part as claimed in claim 6 , wherein said high-elasticity polymeric material is one selected from the group consisting of vinylidene fluoride type rubber, and tetrafluoroethylene-propylene type rubber.

9. A sealing part as claimed in claim 1 , wherein said second member has a neck portion.

10. A sealing part as claimed in claim 9 , wherein a thickness L 3 of the neck portion and a maximum thickness L 2 of said second member satisfy 0.95×L 2 ≧L 3 ≧0.3×L 2 .

11. A sealing part as claimed in claim 10 , wherein the thickness L 3 of the neck portion satisfies and the maximum thickness L 2 of said second member satisfy 0.9×L 2 ≧L 3 ≧0.45×L 2 .

12. A sealing part as claimed in claim 1 , wherein said first member and said second member move independently of one another.

13. A sealing part as claimed in claim 1 , wherein a thickness W 1 of the narrow portion satisfies 2.0 mm≧W 1 ≧0.05 mm.

14. A sealing part as claimed in claim 13 , wherein the thickness W 1 of the narrow portion satisfies 1.5 mm≧W 1 ≧0.1 mm.

15. A sealing part as claimed in claim 1 , wherein the enclosed space is formed by contacting said first member and said second member with each other in three portions.

16. A substrate processing apparatus comprising:

a reduced pressure vessel in which is present a high-elasticity polymeric material-eroding eroding substance;

a processing apparatus that carries out predetermined processing on a substrate housed in said reduced pressure vessel; and

a sealing part that seals an inside of said reduced pressure vessel from an outside;

wherein said sealing part has a first member that is disposed on an inside side of said reduced pressure vessel and is resistant to the eroding substance, the first member comprising a substantially U-shaped cross section that opens out on the outside side of the pressure vessel and has at least one narrow portion which bends for promoting compressive deformation thereof, and a second member made of the high-elasticity polymeric material that is disposed on an outside side of said reduced pressure vessel, and at least one predetermined space formed between at least part of said first member and at least part of said second member,

wherein said at least one predetermined space is an enclosed space formed by contacting said first member and said second member with each other in at least two portions, the enclosed space being disposed inside said first member, and

wherein said at least one predetermined space shrinks when said first member and said second member are compressed.

17. A substrate processing apparatus as claimed in claim 16 , wherein the eroding substance is an active species produced from a reactive active gas, and said first member is made of a fluororesin.

18. A substrate processing apparatus as claimed in claim 16 , wherein the eroding substance is a corrosive gas, and said first member is made of a corrosion-resistant metal.

19. A substrate processing apparatus as claimed in claim 16 , wherein said first member and said second member move independently of one another.

20. A substrate processing apparatus as claimed in claim 16 , wherein the enclosed space is formed by contacting said first member and said second member with each other in three portions.