OPTICAL ELEMENT ANGLE ADJUSTMENT DEVICE AND IMAGE PROJECTION DEVICE

To make it possible to adjust the angle of an optical mirror in a simple and accurate manner.SOLUTION: An optical element angle adjustment device is provided with a first and second projections so as to project onto the same axis from opposite positions across an optical mirror held by a mirror holding part. The optical element angle adjustment device is provided with a bearing part that supports the first projection, a first adjustment member having a long hole par that is formed along a first rotation direction being a direction to rotate the axis of the first projection and into which the second projection part is inserted, and a second adjustment member that is fitted to the second projection projecting from the first adjustment member and rotates the mirror holding part in a second rotation direction having the axis as a rotation axis through the second projection. The optical element angle adjustment device adjusts, with the first adjustment member, the position of the second projection in the long hole part, adjusts the rotation angle in the first rotation direction of the mirror holding part, and adjusts the rotation angle in the second rotation direction of the second adjustment member to rotate the mirror holding part through the second projection and adjust the rotational position of the mirror holding part. Subsequently, the optical element angle adjustment device fixes the respective positions.SELECTED DRAWING: Figure 8 【課題】簡単かつ精度良く光学ミラーの角度調整を可能とする。【解決手段】ミラー保持部に保持された光学ミラーを挟んで対向する位置から同じ軸上に突出するように第１及び第２の突出部を設ける。また、第１の突出部を支持する軸受部と、第１の突出部の、軸を回転させる方向である第１の回転方向に沿って形成された、第２の突出部が挿入される長孔部を備えた第１の調整部材と、第１の調整部材から突出する第２の突出部に嵌合し、第２の突出部を介して、軸を回転軸とする第２の回転方向にミラー保持部を回転させる第２の調整部材とを設ける。そして、第１の調整部材により、長孔部内の第２の突出部の位置を調整して、ミラー保持部の第１の回転方向の回転角度を調整し、第２の調整部材の第２の回転方向の回転角度を調整して、第２の突出部を介してミラー保持部を回転させ、ミラー保持部の回転位置を調整する。この後に各位置を固定する。【選択図】図８