| 摘要 |
PURPOSE:To form a device which effectively utilizes the light quantities possessed by respective luminous fluxes by making the light quantities of the respective light spots uniform with an optical information recording and reproducing device which irradiates the surface of a recording medium with plural light spots by passing the plural luminous fluxes through the same optical system. CONSTITUTION:This optical information recording and reproducing device has the optical system in which the plural luminous fluxes propagate through the same member 24 and a transmitted light quantity limiting member 50 which limits the transmitted light quantities of the plural luminous fluxes to this optical system. This transmitted light quantity limiting member 50 is arranged in the position where the positions of the max. intensity of the respective luminous fluxes are aligned. Namely, the device has a light source 22 which emits the plural luminous fluxes, a collimator lens 24 in which the plural luminous fluxes pass and an aperture 50 which is arranged in the focal position of this collimator lens 24. |
