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发明背景 本发明关系到采用CRT电子显示呈现画面的显示器准直系统,同时还包括电子显示装置发生故障后也能工作的备用光环装置。 光学准直装置是用来把发光目标图象投射到无穷远,为此它被安置在光学物镜的焦面上。当它用于空中导航时,发光目标表示导航信息或者有关着陆信息。驾驶员通过半透明的组合玻璃观看叠加在外景上的信息。
BACKGROUND OF THE INVENTION The present invention relates to a display alignment system employing CRT electronic displays and also includes a spare halo device that operates after a failure of the electronic display device. An optical collimation device is used to project a luminescent target image to infinity, for which reason it is placed on the focal plane of the optical objective. When it is used for air navigation, the light-emitting target represents navigation information or landing information. The driver sees the information superimposed on the exterior through the translucent composite glass.