Optical information storage apparatus

摘要

An optical information storage apparatus is constructed to include a light source (1), a polarization beam splitter (2) reflecting a light beam emitted from the light source and irradiating a reflected light beam on a recording surface of a recording medium, a first part (9) for eliminating a coma aberration which is generated due to a light beam which is reflected by the recording surface and passes through the polarization beam splitter, a second part (8) for eliminating an astigmatism which is generated by the polarization beam splitter and the first part, and a third part (8) for generating an astigmatism. <IMAGE>