发明名称 DOUBLE LASER OPTICAL HEAD
摘要 PURPOSE:To form a satisfactory erasion spot and to easily correct a positional shift by putting a prism into the optical path of the erasion spot to apply the wave surface division to beams and the deflect the optical path of some beam in the direction different from the total deflecting direction. CONSTITUTION:The beams radiated from an erasing semiconductor laser 2 are turned into parallel beams by a condenser lens 4 and undergoes the wave surface division through a prism 23 as well as deflection of their optical paths. These divided beams from images at different positions on a guide track 14 of a disk by an aperture lens 12. Thus a light spot 18 is formed for erasion of both melting and annealing beams. When the spot 18 has a shift to a recording light spot 19 in the direction vertical to a track, the prism 23 is turned by a rotary device using an electromagnetic or bimorph type piezoelectric element. Thus the light passing through the prism 23 is deflected and stabilized on the track 14.
申请公布号 JPS6320734(A) 申请公布日期 1988.01.28
申请号 JP19860164004 申请日期 1986.07.11
申请人 MATSUSHITA ELECTRIC IND CO LTD 发明人 ASADA JUNICHI;SATO TOSHIO
分类号 G11B7/135 主分类号 G11B7/135
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