The motor includes a linear yoke provided at the centre of magnetic circuit and a pair of linear magnets. The yoke and the magnets form a pair of linear gaps with the yoke. The magnetic circuit applies a magnetic field to the gaps. A movable coil mounted of the yoke is moved along the yoke by an electromagnetic action when coil is powered. Each magnet has a larger magnetic force at opposite end portions in the longitudinal direction of the magnet than at an intermediate area.
The magnetic flux density at the linear gap is large at opposite end portions of the gap and small at the intermediate area. When current flows through the coil, the electromagnetic action becomes larger when the coil is at the opposite end portions than at the intermediate area, to thereby produce a larger mechanical action force at the opposite end portions. As a result, a large acceleration/deceleration force is applied to the moving coil at the opposite end portions of the gap, i.e., at the opposite end portions of the motion span of the moving coil.
USE -Optical card recording/reproducing appts. @(27pp Dwg.No. 1/39)@
