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本发明述及光学显示装置,更主要地是涉及为提供两种组合显示图象的平视显示装置,例如,在飞机上用来把阴极射线管产生的图象叠加到地图影屏图象上.更具体地说,本发明是关于用于这样一种平视显示器中的传递透镜.根据本发明提供的传递透镜,它包括一个正光焦度的前透镜组,一个正光焦度的中间透镜组和一个后透镜组.中间透镜组包括一个双胶合透镜.中间透镜组与前透镜组之间留有较大的空气间隔.可以安置一个半透半反的反射镜或其他图象组合器.后透镜组至少包括一个前凸的弯月镜.
The present invention relates to optical display devices, and more particularly to a head-up display device for providing two combined display images, for example, on aircraft for superimposing images produced by cathode ray tubes on a map screen image. More particularly, the present invention relates to a transmission lens for use in such a head-up display. According to the present invention, there is provided a transmission lens comprising a front lens group having positive refractive power, a center lens group having positive refractive power, and a Rear lens group The middle lens group consists of a double cemented lens with a large air gap between the middle lens group and the front lens group A semi-transparent mirror or other image combiner may be placed Rear lens group Including at least one convex meniscus mirror.