| 摘要 |
PURPOSE:To correct the movement of the focus due to any temperature change by providing a plane plate window on the object side of an objective optical system perpendicularly to the optical axis and additionally arranging a relay optical system and a two-dimensional detector for objective optical system adjustment on the same plane as a two-dimensional image detector and additionally arranging a light source between the objective optical system and the relay optical system. CONSTITUTION:The position of a relay optical system 3 in the direction of the optical axis is so adjusted that the peak of the output of a two-dimensional detector 6 for relay optical system adjustment, which is obtained at the time when infrared light emitted from a light source 5 arrives at this two-dimensional detector 6 through a relay optical system 3, is maximum. The position of an objective optical system 2 in the direction of the optical axis is so adjusted that the peak value of the output of a two-dimensional detector 7 for objective optical system adjustment, which is obtained at the time when infrared light emitted from the light source 5 passes the objective optical system 2 and is partially reflected by a plane plate window 1 and arrives at this two-dimensional detector 7 through the objective optical system 2 and the relay optical system 3, is maximum. |
