| 摘要 |
PURPOSE:To set a cut-off region with high accuracy by fitting plural cams and switches to a gear of an X axis and a Y axis turning shaft of an antenna and connecting contacts of the switches operated corresponding to the plural cams with a preset relation. CONSTITUTION:Cams 1x-3x are fitted to a gear 4x for detection so that a circle of the X axis has a section where three cams are overlapped, a section where two cams each are overlapped and a section where no cam is overllaped together in a radiation cut-off device used for the antenna for satellite communication of the X-Y mount form, and switches S1x-S3x are fitted so as to be operated by the cams 1x-3x. Similarly, cams 1y-3y are fitted to a gear 4y for detection in the Y axis and switches S1y-S3y are fitted so as to be operated by the cams 1y-3y. Further, contacts of the S1x-S3x and S1y-S3y are connected according to the preset relation, e.g. as shown in figure, so as to set the radiation cut-off region with high accuracy. |
