| 摘要 |
<p>Turnable beam head for the deviation of a light beam which is used in a laser-writing apparatus. The beam head consists of a tube (1) and a chamber (2), containing a deviation unit, which can be adjusted relative to one another with regard to the optical axis. The chamber (2) is firmly connected to a flange (4) and an intermediate ring (5) which are both arranged concentrically to the optical axis. The tube (1) has a cone (7) to whose narrowed end (10) the intermediate ring (5) is screwed. The cone (7) is surrounded by a fastening piece (11) and is mounted in a sliding manner in a central conical aperture (12) of the fastening piece (11). An external thread (17) onto which a locking ring (13) is screwed is located on the cylindrically exiting narrowed end (10) of the cone (7). To turn the beam head, it is merely necessary to slacken the locking ring (13), rotate the chamber (2) about the optical axis and screw up the locking ring (13) again. Re- adjusting is dispensed with. The rotation of the chamber is realised by the clearance on either side of the locking ring (13) and the mounting fit of the cone (7). <IMAGE></p> |
