| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pickup device where a laser element is arranged easily and an optical axis is smoothly adjusted by adopting an inexpensive element. <P>SOLUTION: The optical pickup device is provided with a 3-wavelength laser 101 having three laser elements 101a to 101c of different emitted wavelengths housed in the same casing, and a diffraction-grating 102 for axis correction for making the optical axes of laser beams emitted from laser elements nearly coincident. The laser elements 101a to 101c are arranged so that light-emitting points may make a straight line in a view from an emitting side, and distances d1 and d2 between the light emitting points are set according to the diffraction angles θ1 and θ2 of respective wavelengths by the diffraction-grating 102. A hologram grating pattern is set to the diffraction-grating 102 so that the diffraction efficiency of the laser beam of each wavelength may range reasonably. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
