Patent Number: 
Section: claims

1. An optical fiber penetration to be disposed in a sleeve provided through a partition wall that separates a first space and a second space, the optical fiber penetration comprising:a first optical fiber cable and a second optical fiber cable each having a thin tube formed of metal and an optical fiber strand inserted in the thin tube;a cylindrical body that is formed of metal and is disposed in an axial direction of the sleeve, an interior of which includes the first optical fiber cable on a side of the first space and the second optical fiber cable on a side of the second space;an internal connector configured to connect the first optical fiber cable with the second optical fiber cable in the interior of the cylindrical body; anda first lid and a second lid configured to close one end and the other end of the cylindrical body respectively,wherein the internal connector separates an interior of the thin tube of the first optical fiber cable and an interior of the thin tube of the second optical fiber cable, and electrically connects the optical fiber strand of the first optical fiber cable with the optical fiber strand of the second optical fiber cable. 2. The optical fiber penetration according to claim 1,wherein the internal connector includes:a socket to which an end of the thin tube of the first optical fiber cable is fixed, and which includes either a female contact or a male contact at a tip end of the optical fiber strand of the first optical fiber cable; anda plug to which an end of the thin tube of the second optical fiber cable is fixed, and which includes either a male contact or a female contact engaged with the contact in the socket, at a tip end of the optical fiber strand of the second optical fiber cable,wherein a periphery of the optical fiber strand of the second optical fiber cable is sealed with a resin to an interior of the plug, andwherein the plug is configured to be attached to the socket in such a manner that the female contact and the male contact are engaged with each other. 3. The optical fiber penetration according to claim 1,wherein the interior of the cylindrical body is filled with a resin. 4. The optical fiber penetration according to claim 3, further comprising:a partition plate that is provided in the interior of the cylindrical body to support the first optical fiber cable and the second optical fiber cable and also divide the interior of the cylindrical body into a plurality of spaces,wherein the resin fills at least one space including the internal connector among the spaces divided by the partition plate. 5. The optical fiber penetration according to claim 3,wherein the resin is a mixed resin in which a cyanate ester resin and an epoxy resin are mixed with each other. 6. The optical fiber penetration according to claim 2,wherein the interior of the cylindrical body is filled with a resin. 7. The optical fiber penetration according to claim 6, further comprising:a partition plate that is provided in the interior of the cylindrical body to support the first optical fiber cable and the second optical fiber cable and also divide the interior of the cylindrical body into a plurality of spaces,wherein the resin fills at least one space including the internal connector among the spaces divided by the partition plate. 8. The optical fiber penetration according to claim 6,wherein the resin is a mixed resin in which a cyanate ester resin and an epoxy resin are mixed with each other. 9. The optical fiber penetration according to claim 4,wherein the resin is a mixed resin in which a cyanate ester resin and an epoxy resin are mixed with each other. 10. The optical fiber penetration according to claim 7,wherein the resin is a mixed resin in which a cyanate ester resin and an epoxy resin are mixed with each other.