| US 7,525,897 B2 | ||
| Optical pickup device | ||
| Kenji Nagatomi, Gifu (Japan); and Seiji Kajiyama, Gifu (Japan) | ||
| Assigned to Sanyo Electric Co., Ltd., Osaka (Japan) | ||
| Filed on Dec. 01, 2005, as Appl. No. 11/290,505. | ||
| Claims priority of application No. 2004-363735 (JP), filed on Dec. 15, 2004. | ||
| Prior Publication US 2006/0126673 A1, Jun. 15, 2006 | ||
| Int. Cl. G11B 7/00 (2006.01) | ||
| U.S. Cl. 369—112.01 [369/121; 369/44.37] | 12 Claims |
| 1. An optical pickup device, comprising:
a semiconductor laser including three light emitting elements for emitting laser light beams having different wavelengths,
which are housed in a case; and
an optical system including an objective lens, for guiding the laser light beams emitted from the semiconductor laser onto
a recording medium,
wherein an optical axis of a laser light beam which is incident on the objective lens as a finite system light beam, of the
laser light beams emitted from the three light emitting elements is aligned with an optical axis of the optical system.
|