| 摘要 |
PURPOSE:To adjust the optical axis of an objective lens easily by dividing a rotary member to be an actuator part into the 1st rotary member coupled with a rotary shaft and the 2nd rotary member provided with the objective lens and two reflecting surfaces and joining these rotary members on a plane vertical to the turning axis having a proper area. CONSTITUTION:The rotary member 4a is tightly coupled with the rotary shaft 2 and the rotary shaft 2 is coupled with a base board 100 through a rotation supporting member 3. On the other hand, two reflecting surfaces 5a, 5b and the objective lens 5 are formed on the rotary member 5b, the rotary member 4a is joined with the rotary member 4b on the basis of plane junction and the joined plane is vertical to the turning axis P of the rotary shaft 2. If it is supposed that the optical axis l of the objective lens 6 is shifted from the turning axis P in the (x) direction, the objective lens 6 and the reflecting surfaces 5a, 5b mounted on the rotary member 4b are simultaneously moved by sliding the rotary member 4b from the rotary member 4a in the (x) direction, so that the turning axis P can be made to coincide with the optical axis l. |
