| 摘要 |
PROBLEM TO BE SOLVED: To cause a person in a rear to see a front part by a method wherein steel sheets the surface and the back of which forming a mirror finished surface are arranged in a louver-form manner. SOLUTION: Steel sheets 5 are arranged at a given inclination angleαand in an overlap (f) and a surface (a) and a back (b) of each steel sheet 5 form a mirror finished surface 7. Beams (e) from a front is collided with the mirror finished surface 7 of the surface (a) of the steel sheet 5 and reflected thereby and collided with the mirror finished surface 7 of the back (b) of the opposite steel sheet 5 and reflected thereby and reach a rear. Thus, a person 10 in a rear inspects a front part a front field of view is obtained. Further, since the steel sheets 5 are arranged in a louver-form manner, an airframe from a front is collided with the surface of the surface of the steel sheets and a progress to a rear is blocked. This constitution reduces the thickness of the inspection window as compared with bulletproof glass having the same strength as that of the inspection window and ensures the same field of view as that of the bulletproof glass.
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