| 摘要 |
PROBLEM TO BE SOLVED: To realize further mass production and cost reduction by precisely and simply mounting optical parts and light receiving/emitting elements in the same package. SOLUTION: An optical head 1 is provided with the light emitting element 14, an objective lens, a diffraction grating 9 provided with a diffraction means having a pair of linear gratings with grating intervals different from each other, a first photodetector 16 light receiving return light diffracted by one side grating of a pair of diffraction means and a second photodetector 17 light receiving the return light diffracted by the other side grating. Relating to this optical head 1, the light emitting element 14 is arranged on a substrate 13 arranged with the first photodetector 16 and the second photodetector 17. |
