| 摘要 |
<p>PROBLEM TO BE SOLVED: To make the optical axis of a laser beam and that of a condensing lens system coincide accurately by installing a spherical mirror attachably/ detachably at the tip end (irradiation machining part) of a laser optical system and adjusting the optical axes with the user of reflected light moving backward through a condensing lens. SOLUTION: A glass-made real sphere (spherical mirror) 5 is installed at the tip end of the tube 14 of a condensing lens system 4, with the spherical center 5a on the optical axis L of the lens system. In adjusting the optical axis, the condensing lens system 4 is first retreated, making the position of its converging point coincide with the intersection 5b on the surface of the glass-made real sphere 5 in terms of optical distance, and recording the light receiving position detected on an image pickup means 9. Then, the condensing lens system is advanced, adjusting the posture/position of a plane mirror 2a while the reflected light on the image pickup means 9 is detected so that the position of the converging point coincides with the center 5a of the real sphere 5 in terms of optical distance, and making the light receiving position at the advanced point of the condensing lens system 4 coincide with the one recorded at the previous retreated point of the system 4.</p> |
