Mechansim for feeding a pickup carriage of a recording medium reproducing device

摘要

A feeding screw (4) is rotatably mounted on a chassis (1) of a recording medium reproducing device. A half nut (5C) having a semicircular sectional shape is mounted on an optical pickup carriage (5). The half nut (5C) has at least one thread (5C1) which comprises a thick central portion (L1) to be engaged with the feeding screw (4), and thin side portions (L2, L3) at both sides not to be engaged with the feeding screw (4). The optical pickup carriage (5) is fed by a rotation of the feeding screw (4), being engaged with the half nut (5C).