Patent ID: 8181617

Claim:
An ignition device for the ignition of a combustible or explosive gas mixture in a main combustion chamber ( 1 ), in particular for the ignition of a fuel-air mixture or a combustion gas-air mixture in an internal combustion engine, comprising a high temperature-resistant absorber body ( 5 ), which is arranged in contact with gas mixture coming from the main combustion chamber ( 1 ), with a combustion chamber inner side ( 6 ) facing the gas mixture, and a light guide path for guiding a laser beam ( 7 ) onto the absorber body ( 5 ) in order to heat the absorber body ( 5 ) with the laser beam ( 7 ) until an ignition temperature (TZ) required for the ignition of the gas mixture is reached on the combustion chamber inner side ( 6 ) of the absorber body ( 5 ), wherein the light guide path up to the absorber body ( 5 ) is configured in such a way that the laser beam ( 7 ) does not have direct contact with the gas mixture of the main combustion chamber ( 1 ), wherein a prechamber ( 10 ) with at least one overflow opening ( 11 ) connecting the prechamber ( 10 ) and the main combustion chamber ( 1 ) is located upstream of the absorber body ( 5 ) on the combustion chamber inner side ( 6 ), wherein the combustion chamber inner side ( 6 ) of the absorber body ( 5 ) is facing the gas mixture of the prechamber ( 10 ) and the light guide path up to the absorber body ( 5 ) is configured in such a way that the laser beam ( 7 ) does not have direct contact with the gas mixture of the prechamber ( 10 ).