Long-shot optical-train type precision approach course indicator light structure

Abstract

The invention belongs to the field of aerotechnics, and particularly relates to a long-shot optical-train type precision approach course indicator light structure which comprises a light source device, a color filter, a concave lens, a convex lens and a lamp box, wherein the light source device, the color filter, the concave lens and the convex lens are positioned in the lamp box; the lower edge of the color filter, the center of the concave lens and the center of the convex lens are on the same primary optical axis; the distance between the concave lens and the convex lens is smaller than the focal length of the convex lens and greater than the sum of the negative focal length of the concave lens and the focal length of the convex lens; the concave lens and the convex lens constitute the long-shot optical-train with a long focal length; the color filter is positioned at the composite focus of the long-shot optical-train; and rays emitted from the lower edge of the color filter become parallel at the primary optical axis after passing through the concave lens and the convex lens. The invention has the advantages of simple structure and novel concept, and realizes a long-shot optical-train type precision approach course indicator light structure which has the advantages of long focal length, large tolerance of defocusing amount, and easy realization of three-division angle, and solves the problems of high requirements for working accuracy, difficult regulation on light path and difficult realization of three-division angle in the common single-lens precision approach course indicator light.

Description

technical field [0001] The invention belongs to the field of aviation technology, and in particular relates to a telephoto light group type precision approach channel indicator light structure. Background technique [0002] The precision approach course indicator can provide five approach course slope indication signals: higher than the approach course, slightly above the approach course, on the approach course, slightly below the approach course, and below the approach course, which can help The aircraft can maintain the accurate approach slope while maintaining the accurate approach direction, which is an important visual course indication system in the instrument landing system of modern airports. [0003] Generally, the precision approach indicator light adopts the structure of a single convex lens. In order to meet the requirement of the red-white transition zone angle of less than 3 points in the ICAO standard, the color filter should be precisely installed at the foca...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of general single-lens type precision approach channel indicator lights, which require high machining accuracy, difficult optical path adjustment, and difficult to realize the three-point angle requirement, and provide a long focal length, large defocus tolerance, and three-point angle Requires an easy-to-implement telephoto light group type precision approach channel indicator light structure

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