| 摘要 |
PROBLEM TO BE SOLVED: To provide a high density optical information reproducing device that allows a simple and small-sized optical system to be constituted, while the amount of irradiation light irradiated on a recording medium can be controlled properly. SOLUTION: Between a light source means and a beam splitter, an optical filter is arranged and outgoing light of the optical filter is reflected by the beam splitter. Based on the detected result of a photo-detector to receive the reflected light, the amount of a light beam from a light source means is controlled. |
