Cannon having laser ignition system and breech window cleaning system

A cannon, comprising

• a barrel having a chamber in which a shell and a propelling charge are mounted;
• a breech ring connected to the rear of the barrel, and having a shell inlet communicating with the chamber such that the shell and the propelling charge are loaded into the barrel;
• a recoil buffer disposed on an outer circumferential surface of the barrel and configured to guide recoiling and returning motions of the barrel;
• a breechblock connected to the breech ring, and moving relative to the breech ring between a closed position that closes the shell inlet and an open position that opens the shell inlet;
• a laser ignition device comprising a laser portion disposed in the breechblock and configured to emit a laser to ignite the propelling charge, and a breech window covering the laser portion and allowing the laser to be transmitted into the chamber;
• and
• a breech window cleaning device configured to clean the breech window,
• wherein the breech window faces the chamber when the breechblock is at the closed position, and is exposed outside the chamber when the breechblock is at the open position, and
• the breech window cleaning device is configured to clean the breech window when the breechblock is at the open position.