| 摘要 |
PURPOSE:To enable both beam form converting function and optical path converting function of a prism to satisfy the prescribed value respectively, by providing a positioning part to a housing to control an angle formed by the optical axis of a collimator lens and a total reflecting surface of the prism which provided with said surface. CONSTITUTION:A positioning stage part 7 sets the position of the optical path of a lens barrel 2a containing a semiconductor laser 1 and a collimator lens 2. A positioning stage part 8 sets the position of the total reflecting surface of a prism 6. These parts 7 and 8 function to set an angle formed by the positioning surfaces such as LL, SS, etc. equal to a vertical angle theta4 of the prism 6. Therefore the angle formed by the incident optical axis to the prism 6 and the total reflecting surface of the prism 6 is controlled to the angle theta4 by pressing and fixing the total reflecting surface of the prism 6 to the part 8 and at the same time the laser 1 and the barrel 2a to the part 7 respectively. Thus an incident angle theta1 to the incident surface of the prism 6 is set correctly based on angles theta3 and theta4 of the prism 6. Then a beam form converting function of the prism 6 satisfies a prescribed conversion factor, and furthermore the orthogonal performance is also satisfied between an incident optical axis and an output optical axis. |
