| 摘要 |
PURPOSE:To miniaturize a reproducing optical system and make it light and to facilitate the adjustment of the system, by providing a composite analyzer in which two analyzers are joined, and a wedge prism which divides a beam of light on the same line as the junction line of the analyzer, in the optical path of a reproducing beam. CONSTITUTION:A laser beam 1 is projected on a magneto-optical recording medium 6, and a reflected reproducing beam of light is optically divided by a beam splitter 4, and the divided beams of light are detected by the composite analyzer 8 in which the two analyzers are joined. Next, a wavelength beam of light is introduced to the wedge prism which divides the beam of light on the same axis of the junction line of the analyzer 8, and is amplitude-divided with angles in two directions centering an optical axis, and each beam of light is condensed on a bi-sected optical detector 10. A detected beam of light, since whose phase being shifted by (pi), can be differentially amplified by a differential amplifier 11. Thus, since the composite analyzer is used, it is possible to simplify the reproducing optical system, and also to perform the adjustment of the system with resulting high accuracy, and to miniaturize the system and make it light.
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