| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely correct aberration, to adjust a position of a laser light source, to make adhering and fixing operation easy, and to secure an installation space of a light receiving element for monitor. <P>SOLUTION: In the optical head device 1, a first laser beam is made incident on a first beam splitter 521 of a parallel flat plate type from a diagonal direction, the transmission light is guided to an optical recording medium 5 through an objective lens 54, and the reflected light is guided to a light receiving element 45 for monitor. A first laser light source 31 and the light receiving element 45 for monitor are positioned at an incident plane side of the first laser beam of the first beam splitter 521, and a mirror 53 and the objective lens 54 are positioned at an out-going side of the first laser beam. It is easy to secure an installation space at the incident plane side of the first beam splitter, though the light receiving element 45 for monitor is arranged, it is easy that the first laser beam light source 31 can be approached to a side of the light receiving element 45 for monitor. <P>COPYRIGHT: (C)2009,JPO&INPIT |
