The invention relates to a disk optical component, in particular to an optical signal acquisition device, comprising a base, a movable portion and an optical path system, wherein the optical route system comprises a light-emitting element, an optical path converter, a condensing element and a photosensitive element. The light-emitting element, the optical path converter and the photosensitive element are located on the base. The movable portion comprises a condensing support base, a condensing support, two U-shaped magnet bases, at least two welding rods and four suspension wires, which are connected between the condensing support and the condensing support base. Two suspension wires are connected with a focusing coil at one end of the condensing support, and the other two are connected to a tracking coil. The base is further provided with welding studs with the same number as that of the welding rods, and the welding studs and the welding rods vertically corresponds to each other in position to be welded together. The optical signal acquisition device simplifies the technical process, and reduces the reject rate and the processing cost.