| 摘要 |
PURPOSE:To improve the simultaneous recording actions of plural information signals, etc., by reflecting and transmitting respective reflected lights from converged points generated by a laser light transmitted through a polarized beam splitter and the laser light reflected at the splitter at and through the polarized beam splitter, thereafter, converging the lights and giving them to photodetectors, respectively. CONSTITUTION:A reflected light Pl 2r from a converged point S2 generated by a laser light Pl 2 transmitted through a polarized beam splitter PBS provided in an optical system is reflected at the polarized beam splitter PBS, thereafter, converged by a collimator lens Lc1 and given to a photodetector PD2. A reflected light Pl 1r from a converged point S1 generated by a laser light Pl 1 reflected at the polarized beam splitter PBS is reflected at the polarized beam splitter PBS, thereafter, converged by a collimator lens Lc2 and given to a photodetector PD1. Thus, the action in the simultaneous recording action and reproducing action or both actions of plural information signals can be executed by one optical head. |
