PURPOSE: To improve the optical coupling efficiency of reproducing laser light and to ensure the stable reproduction of information, by setting both the light emitting end face of a semiconductor laser and the photodetecting surface of a photodetecting element in a container staring them so that they are put on a straight line to the light transmitting window of the container.
CONSTITUTION: A light transmitting window 9, the light emitting end face of a semiconductor laser 1 and the photodetecting surface of a photodetecting element 2 are set in a container so that they are approximately put on a straight line along an axial line passing through the center of a support ring. The laser light radiated from a light transmitting part is irradiated on the surface 3 of an optical disk, and the information recorded on the surface 3 is reproduced by means of the reflected light given from the surface 3. Thus the reproducing laser light is extracted from the upper surface of the container with use of a single light emitting part. This extracted laser light is fitted to a cylinder which supports optical systems 4 and 4' that lead the laser light to the surface 3. This device facilitates coupling of laser light as well as position matching of optical axes. As a result, the optical coupling efficiency is improved for the reproducing laser light.
SASAKI YOSHIMITSU
SUGIYAMA TOSHIO
MAEDA TAKESHI
OSHIMA MASAHIRO
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