| 摘要 |
PURPOSE:To easily attain simultaneous or time division write by receiving the rays of light having plural wavelengths simultaneously or in time division from a light source and focusing the light of each wavelength onto the optical recording layer of a recording medium corresponding to the light of each wavelength independently. CONSTITUTION:A collimated pulse light having different wavelength emitted from laser light sources 35-36 via a collimate lens is reflected in half mirrors 32-34 and focused 44, 43, 42 onto optical recording layers 38-40 corresponding to the light of each wavelength of the optical recording medium 41 through the optical element (e.g., Fresnel plate) 31. Thus, simultaneous recording or quick time division recording is applied to the multi-layer recording medium by using a wavelength multiplex light. |
