| 摘要 |
PURPOSE:To constitute a transversal filter, and to perform the correction of a reproduced signal by providing a means to adjust the respective irradiation light quantity of plural light fluxes or the means to adjust the output of respective photoelectric converting means. CONSTITUTION:Emitted light from light sources 1,2,3 forms three irradiation spots 14,15,16 on a track 12 on a recording medium 11 by an optical system 8, and its reflected light is changed again in its direction by a beam splitter 7, and reforms an image on a photoelectric converting element 9, and the light of signal spots 17,18,19 is photoelectric-converted in a lump. Through this consti tution, one record pit comes to be read three times successively as being delayed by the irradiation spots 14,15,16 and the photoelectric converting element 9, and if the light quantity is made variable respectively and independently by light quantity setting circuits 4,5,6, output level is made variable, and the trans versal filter can be constituted. |
