| 摘要 |
PURPOSE:To improve a level, lowered due to a disturbing wave nearly up to a directional level by providing several rectangular metallic fins to the circumferential edge of a reflex mirror in parallel to an opening surface. CONSTITUTION:Several rectangular metallic fins 15 are provided along the circumferential edge of reflex mirror 13, nearly in parallel (perpendicular to the axis of the mirror) to its opening surface and at fixed intervals. Each rectangular metallic fin 15 is formed of a lightweight conductor plate of aluminium, etc.; its width and height are set nearly to one wavelength and a half wavelength respectively, and each arrangement interval is approximately one wavelength. |
