| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk device that improves a yield in manufacturing by suppressing the influence of noise caused by multiple interference in an adhesive layer and improving the reliability of signal detection and to provide an optical pickup and a composite optical device. <P>SOLUTION: A prism 30 has a slant surface 30a to be a light incident surface, a top surface 30b, a first bottom surface 30c, a second bottom surface 30d, an end surface 30e and an end surface 30f. The first bottom surface 30c and the second bottom surface 30d are provided at a slant with respect to the arrangement direction of photodiodes 1 and 2. A boundary 30g between the bottom surfaces is located over a central part between the photodiodes 1 and 2 and extends in a direction perpendicular to the arrangement direction of the photodiodes 1 and 2. The first bottom surface 30c and the second bottom surface 30d are formed in a mountain shape that projects downward so as to make the height lower as the bottom surfaces go from the both edges of the bottom surfaces in the arrangement direction of the photodiodes 1 and 2 to the boundary 30g. <P>COPYRIGHT: (C)2008,JPO&INPIT |
