| 摘要 |
PURPOSE:To collect plural luminous fluxes onto an information recording medium without changing their relative position by converting the light emitted from the 1st and 2nd light sources into collimated lights respectively, leading the light to a large quantity light converting means in a moving system, converting the light into >=2 luminous fluxes different in progressing direction and collecting the light to difference positions on the information recording medium. CONSTITUTION:A laser light La emitted from a semiconductor laser oscillator 4 is converted into a collimated luminous flux La' by a collimate lens 6 and a laser light Lb emitted from a semiconductor laser oscillator 5 is converted into a light Lb' respectively, they are combined by a dichroic mirror 8, led to an optical guide member 14 through a polarized beam splitter 10 in the collimated state. Since the upper face 14a and the lower face 14b of the optical guide member 14 are not in parallel, the lights are tilted after the reflection and collected on a tracking guide of an information storage medium 1 while passing sequentially through a 1/4 wavelength plate 15 and an objective lens 16. As a result, the spot light (a) for recording/reproduction is emitted and the erasure spot light (b) is emitted just before this side. |
