US 7,609,606 B2
Optical pickup device
Kenji Nagatomi, Gifu (Japan); Seiji Kajiyama, Gifu (Japan); and Yoichi Tsuchiya, Hashima (Japan)
Assigned to Sanyo Electric Co., Ltd., Osaka (Japan)
Filed on Dec. 14, 2005, as Appl. No. 11/302,343.
Claims priority of application No. 2004-381252 (JP), filed on Dec. 28, 2004.
Prior Publication US 2006/0140078 A1, Jun. 29, 2006
Int. Cl. G11B 7/00 (2006.01)
U.S. Cl. 369—112.01  [369/44.37; 369/112.03; 369/112.05] 14 Claims
OG exemplary drawing
 
1. An optical pickup device, comprising:
three laser elements provided in a CAN package, for emitting three kinds of laser light beams of blue, red, and infrared light beams to a recording medium, a blue light emitting point and an infrared light emitting point being arranged in a layer forming direction of the laser elements so that an interval (d2) between the blue light emitting point and the infrared light emitting point becomes smaller than an interval (d1) between one of the blue light emitting point and the infrared light emitting point and a red light emitting point; and
a diffraction grating for aligning an optical axis of a laser light beam emitted from the red light emitting point with an optical axis of a laser light beam emitted from one of the blue light emitting point and the infrared light emitting point.