| 摘要 |
PURPOSE:To independently adjust the light emission quantities of plural laser light sources, and to prevent the influence of the reflected light, etc., on the optical system by separating plural lights emitted toward on object into two directions respectively, and further, converging them. CONSTITUTION:Laser lights 34, 36 advancing from the laser light sources 12, 14 toward on optical disk 30 are separated into two directions respectively, and the laser lights 38, 40 in one direction are converged by a lens 24, and beam waits are converged respectively. Then, photo-detecting cells 26a, 26b are arranged at the positions of the light converging points of the lens 24, and the lights from the light sources 12, 14 are detected separately, and the respective light emission quantities are controlled independently. As the result, the influence of a laser noise or drift at the light sources 12, 14 can be reduced, and an information signal can be recorded by high density. |
