| 摘要 |
PURPOSE:To reduce the transmission lass by providing a variable speed gear mechanism which drives and rotates a trapezoidal prism at the angular velocity of a half as fast as that of a rotary body and a reflecting body which reflects and guides the light in an area outside the diameter of the trapezoidal prism to the trapezoidal prism. CONSTITUTION:Converging lenses 9a, 9b, 9c ... i receptacles 15a, 15b, 15c ...are provided on the side of the incidence surface 3a of the trapezoidal prism 3 on an axis parallel to the prism optical axis, and rhomboid prisms 30a, 30b, 30c ... are disposed on a fixed body 1 as reflecting bodies between the trapezoidal prism 3 and converging lenses Similarly, converging lenses 10a, 10b, 10c ...and rhomboid prisms 31a, 31b, and 31c are disposed on the rotary body 2 on the side of the projection surface 3. Further, the variable speed gear mechanism 22 reduces the angular velocity of the rotation of the rotary body 2 to a half. Consequently, the distance between optical fibers 14 and 5 is shortened by the short-sized trapezoidal prism 3. |
