| 摘要 |
PURPOSE:To attain the conversion of a circle beam to a parallel circular beam, by positioning the first almost cylindrical lens, and the second almost cylindrical lens on the optical axis of divergent light, and positioning respective focus on the emitting point of a semiconductor laser. CONSTITUTION:First of all, the divergent light whose cross-sectional shape is formed in a circle from a semiconductor laser 1 is made incident on a beam arranging element 8. The almost cylindrical light refracting plane A of the beam arranging element has a focus distance of fA, and a light beam shown in view Q is converted to a parallel light beam by coinciding a focus position with the emitting point of the semiconductor laser 1. An almost cylindrical light refracting plane B to which the light beam is made incident has a focus distance of fB, and the light beam shown in view P is converted to the parallel light beam by coinciding the focus position with the emitting point of the semiconductor laser 1. The circular beam having a requested diameter can be obtained by using the beam arranging element on which the fA and the fB are set at specific values, corresponding to beam diameter ratios on the parallel side and the vertical side of the divergent light. |
