Patent Number: 6,167,018

Title: Optical information storage apparatus having cylindrical lens for eliminating astigmatism generated by polarization beam splitter and newly generating astigmatism

Abstract: An optical information storage apparatus is constructed to include a light source, a polarization beam splitter 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 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 for eliminating an astigmatism which is generated by the polarization beam splitter and the first part, and a third part for generating an astigmatism.

Inventors: Morimoto; Yasuaki (Kawasaki, JP), Nishimoto; Hideki (Kawasaki, JP), Ukai; Hirataka (Kawasaki, JP)

Assignee: Fujitsu Limited

International Classification: G11B 11/105 (20060101); G11B 11/00 (20060101); G11B 7/135 (20060101); G11B 7/125 (20060101); G11B 007/09 ()

Expiration Date: 12/26/2013