| 摘要 |
PROBLEM TO BE SOLVED: To provide a laser ignition device having a structure wherein flexibility in a lens-mounting position is high and a laser beam-emitting window is hard to damage. SOLUTION: The laser ignition device includes a laser light-source 11 for emitting the laser beam 20, a lens-barrel 12 having one end connected to the laser light-source 11 and the other end connected to a combustion chamber 9 of an engine, a laser emitting window 13 provided at one end of the combustion chamber 9 side of the lens-barrel 12, a lens 14 arranged in the lens-barrel 12 so as to condense the laser beam 20 in the combustion chamber 7. The lens 14 is composed of an optically isotropic ceramic. The lens 14 has improved translucency and improved thermal resistance, thus the lens 14 can be mounted in the vicinity of the combustion chamber exposed to high temperature. Further, the window for emission of the laser beam is effectively prevented from being damaged, because concentration of high-density energy to the laser-emission window can be avoided. COPYRIGHT: (C)2008,JPO&INPIT
|
