| 摘要 |
An optical pick-up apparatus can be used for recording or reproducing information signals onto/from both a compact disc and a digital versatile disc. The optical pick-up apparatus has a base plate, a pair of guide bars fixed to the first bottom wall of the base plate, first and second permanent magnets fixedly coupled to both side walls of the base plate, first and second tracking coils slidably wound around the first and second permanent magnets, an object lens holder formed at upper and lower edges thereof with focusing coils, first and second object lenses mounted on the upper surface of the object lens holder, a movable member slidably assembled with the first and second guide bars, a pair of leaf springs for coupling the object lens holder to the movable member, a half mirror section for directing a half of the reflected laser beam towards the first object lens and transmitting a remaining half of the laser beam therethrough, and a total reflection section for directing the laser beam which passes through the half mirror section towards the second object lens. The radius curvature of the first object lens is different from the radius curvature of the second object lens. The optical pick-up apparatus has a simple construction and is easily manufactured at a reduced cost.
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