| 摘要 |
PURPOSE:To adjust easily the focal length, by making it possible that a member holding a lens array, where many lenses are arranged in a row, and a mirror array as one body and a member holding an optical path converting member are engaged with each other and are moved individually in the direction of the optical axis. CONSTITUTION:Lens arrays 1 and 3 are held as one body in the first housing 11. One optical path converting member 5 is held in the second housing 12, and the end part on the side of the lens array 1 is opened in the first housing 11, and the end part on the side of the lens array 1 is opened in the second housing 12 also. The inside circumferential face of the second housing 12 is engaged with the outside circumferential face of the lens array-side end part of the first housing 11, and they are moved in the direction of the optical axis. Aperture windows for incident light and exit light are provided in upper and lower parts of the second housing 12. |
