| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pickup device for recording and reproducing information which is ready for four different types of optical recording media while it is low in cost and compact in size. <P>SOLUTION: A first objective lens OBJ1 condenses light on information recording surfaces of a BD and HD which are optical disks using the flux of light having the shortest wavelength λ1, and consequently the flux of light emitted from a first semiconductor laser LD1 is effectively used. Optical paths from semiconductor lasers LD1-LD3 to the first objective lens OBJ1 or second objective lens OBJ2 are formed so that a condensing spot formed by the first objective lens OBJ1 and a condensing spot formed by the second objective lens OBJ2 may be different in location from each other in a face vertical to an optical axis, and accordingly switching the first objective lens OBJ1 and the second objective lens OBJ2 according to the information recording optical disc is not required and a moving mechanism is not required. Therefore, the simplification and miniaturization of an optical pickup device is possible. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
