ADJUSTABLE DICHROMATIC REFLECTOR UNIT

摘要

A transducer or optical head arrangement for an optical disk recorder includes an adjustably mounted dichroic beam combiner. The adjustments are in two degrees of freedom about a pivot point located near a light beam entry point. The write light source has its emitted beam reflected to the optical disk through a minimum of optical elements. The readback or sensing elements are optically coupled to the optical disk via a light path extending through the beam combiner entering at about the pivot point. The sensing elements include a second light source, an optical detector and a beam splitter. The two light sources are shown as semiconductive laser-emitting different frequency light beams. A four-screw, adjustably-mounted aperture plate retains a partial spherical dichroic beam combiner in a cavity of an optical support.