| 摘要 |
PROBLEM TO BE SOLVED: To provide the optical pickup device capable of recording and reproducing two kinds of optical recording media which are different in recording and reproducing wavelength, high utilizing efficiency of light with good shaping of a beam and also compactness in size. SOLUTION: This device has 1st and 2nd light sources 1 and 2 which are different in wavelength of light emission, a coupling lens for coupling light beams from the individual light sources l and 2, an objective lens 7, optical path separating optical means 4 and 5 for separating return light beams from projecting optical paths from the light sources 1 and 2 to the objective lens 7, detecting means 9, 10 and 11 for receiving the separated light beams and detecting information of the reflected light beams as common to these light beams and a control means for performing focusing control and tracking control based on the above detecting result. These individual light sources 1 and 2 are lit at the time of using the optical recording medium 8A of the 1st kind and the optical recording medium 8B of the 2nd kind respectively, and the coupling lens 3 is an anamorphic lens to substantially collimate the light beams from the light sources 1 and 2 respectively and also to shape these beams. |
