| 摘要 |
PURPOSE:To simply and easily adjust the optical axis of a light emission source by turning a lens around a revolving axis a prescribed extent off the optical axis of the lens, and reducing the scattering angle of the divergent light from the light emission source. CONSTITUTION:A housing 2 to which a light emission source 1 which emits the divergent light is fixed is provided with a lens 4 which is freely turned around a revolving axis A of an extent delta off an optical axis B, and this extent deltais approximately equalized to the extent of deviation between an ideal optical axis C of the light emission source 1 and the axis A. When the lens 4 is turned around the axis A to make the axis A parallel with axes B and C, the scattering angle of the divergent light is reduced or the divergent light is converted to parallel rays, and the optical axis of the light emission source is easily and simply adjusted, and the constitution of an optical head or the like is simplified and miniaturized. |
