ANTENNA DEVICE

To solve the problem in which a structure of a three-axis antenna device having an azimuth axis, an auxiliary axis, and an elevation axis that does not have an auxiliary axis as a substance is complicated.SOLUTION: The antenna device includes: an antenna unit 1 having a reflecting mirror 6; an elevation axis structure 15 for rotatably supporting the antenna unit 1 around an elevation axis EL that changes an elevation angle; a semi-circular auxiliary shaft structure 9 that rotates around the auxiliary axis XEL, holding the elevation axis structure 15 rotatably, having a rolling surface 23 having at least part of a cylindrical surface having a central axis about an auxiliary axis XEL orthogonal to the elevation axis EL; an auxiliary shaft structure support unit 18B for supporting the rolling surface 23 so that the rolling surface 23 can move; a support belt 17 connected to both ends of the auxiliary shaft structure 9 and being tensioned; a belt drive unit 20 for moving the support belt 17; a tension applying unit 24 for applying tension to the support belt 17 by pressing the support belt 17 in a direction of the rolling surface 23; and a roller unit 18 for making the support belt 17 movable.SELECTED DRAWING: Figure 7 【課題】 実体としての補助軸を有しない、方位角軸、補助軸および仰角軸を有する３軸構成のアンテナ装置の構造は複雑である。【解決手段】 反射鏡６を有するアンテナ部１と、仰角を変更する仰角軸ＥＬの回りにアンテナ部１を回転可能に支持する仰角軸構造体１５と、仰角軸構造体１５を回転可能に保持し、仰角軸ＥＬと直交する補助軸ＸＥＬを中心軸とする円筒面を少なくとも一部に有する転動面２３を有し、補助軸ＸＥＬの回りに回転する半円弧状の補助軸構造体９と、転動面２３が移動可能なように転動面２３を支持する補助軸構造体支持部１８Ｂと、補助軸構造体９の両端部に接続し張力が加えられた支持ベルト１７と、支持ベルト１７を移動させるベルト駆動部２０と、支持ベルト１７を転動面２３の方向に押し付けることで、支持ベルト１７に張力を与える張力付与部２４と、支持ベルト１７を移動可能にするローラ部１８とを備えた。【選択図】 図７