OPTICAL PICKUP DEVICE AND MAGNETOOPTICAL REPRODUCING APPARATUS.

摘要

A light beam emitted from a source of light is split by a light-splitting element into two light beams which are linearly polarised to meet at right angles with each other and which propagate in different directions. Then, a converter element changes the phase between the oscillation components of each light beam with respect to two orthogonal axes in a plane perpendicular to the beam path. This enables two differently polarised beams to overlap on the recording medium. Thus, the effective area of irradiation is made smaller than the actual beam spot size.