| 摘要 |
Disclosed is a hologram optical pick-up using two laser sources (11, 11'). In a hologram optical pick-up according to the present invention, laser beams having different wavelength, which are emitted from first and second laser sources (11, 11') and focused by an objectiveive lens (16) on a disc (17, 18), are reflected at a surface of the disc (17, 18). The reflected laser beams are diffracted by a first hologram (13) or a second hologram (14), and then received by a first photo detector (19) or a second photo detector (20). Accordingly, laser beams having different wavelengths according to a thickness and a recording surface of the disc are emitted by the first laser source (11) or the second laser source (11') to compensate for aberration of laser beam due to the thickness of the disc (17, 18). Thereby, the hologram optical pick-up can reproduce data from discs (17, 18) having different recording surface without loss of data. Also, the hologram optical pick-up can record and reproduce data on/from any disc under best environment and can increase efficiency of the laser beam. <IMAGE> |
