| 摘要 |
PURPOSE:To detect correctly the position of a picture without causing fluctuation by blowing air between the lens and a hot object in an apparatus used for taking a picture of the object and displaying the picture thereof, and making the air current turbulent to eliminate the effect of convection of the air. CONSTITUTION:The air is blown between a hot body 2 to be observed and an objective lens of a camera 3 from a nozzle 6, and a turbulent flow is formed under the camera 3 through a concave plate 7. As a result, the fluctuation of the air is avoided and a stable picture 8 is obtained. The central position 9 of the picture 8 is also accurately obtained. |
