| 摘要 |
PURPOSE:To follow the variation of the mutual position between an optical disc and an optical head and to attain high speed access to a track by uniting only a supporting means to support a reflector and a condensing lens as a movable part relatively replaceable to an optical head housing. CONSTITUTION:The reflector 3 converting the optical path of the light from a light source in the direction to a disc surface and the condensing lens 2 condensing the light directed from the reflector 3 to the optical disc surfaced and the light reflected by the optical disc surface are fitted to a base body 10 by respectively supporting means 13, 31 and united with each other. The reflector 3 is fixed so that the condensing lens 2 can be replaced in parallel with an optical axis L2, and the base body 100 of which penetration hole is engaged with the shaft 12 of a linear movement bearing means is supported by a weak force so as to be moved only in the direction of an arrow X. |
