| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical head device wherein the angle of an optical part is adjusted with small torque and in a satisfactory range. SOLUTION: In the optical head device 1, when an eccentric shaft 61 is inserted into a jig inserting hole 51 formed in a holder 50 holding a diffraction grating 12 and the holder 50 is rotated around an optical axis L20, since the width of the jig inserting hole 51 is wider in the central side of the rotation of the holder 50 than in the opening edge 511, the part with which the eccentric shaft 61 comes into contact is always the part of the opening edge 511 of the jig inserting hole 51 even if the eccentric shaft 61 is long, and this part is apart from the center of the rotation (optical axis L20) of the holder 50. Thus, the holder 50 is rotated around the optical axis L20 by small torque. |
