| 摘要 |
PURPOSE:To prevent dust attached on an objective lens by providing a loadable/ unloadable light transmission member which covers the objective lens at the light emitting port of an optical head, and exchanging the member by using a jig for exchange. CONSTITUTION:The light transmission member 18 is fixed on a cover 15 with an adhesive, etc., and the cover 15 is mounted on the case of the optical head 1 removably by a groove 17. A new cover 15' is pressed by moving the tip 29 of a lever 23 which slides the knob 26 of the jig for exchange along an L-groove 25 in a direction of arrow A, and the new cover 15' is moved on a first arm 21, then, presses the cover 15 mounted on the optical head 1. The cover 15 is moved along the groove 17, and is housed in a second arm 30, and the cover 15' is moved along the groove 17 as pressing the cover 15, and is loaded on the optical head 1. Thereby, it is possible to easily exchange the light transmission member 8, and to surely prevent a fault due to the dust attached on the objective lens occurring. |
