| 摘要 |
An optical head device may include a first laser light source, a second laser light source, a first parallel-plate type beam splitter for guiding a first and a second laser beams to a common objective lens, a second parallel-plate type beam splitter for guiding the second laser beam to the common objective lens, an aberration correction lens disposed between the first laser light source and the first beam splitter for correcting an aberration generated when the first laser beam transmits through the first beam splitter; and a light source unit which is structured by fixing the first laser light source and the aberration correction lens to a common holder in a state that a relative position between the first laser light source and the aberration correction lens is previously set.
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