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    • 3. 发明授权
    • Apparatus for recording and reproducing information on an optical disc
    • 用于在光盘上记录和再现信息的装置
    • US4574371A
    • 1986-03-04
    • US466910
    • 1983-02-16
    • Haruhiko TakemuraKiichi KatoMasaharu Sakamoto
    • Haruhiko TakemuraKiichi KatoMasaharu Sakamoto
    • G11B7/08G11B7/085G11B7/12G11B7/00
    • G11B7/12G11B7/08G11B7/085
    • An optical recording and reproducing apparatus includes a first semiconductor laser for emitting a recording laser beam whose intensity is modulated in accordance with an information signal to be recorded and a second semiconductor laser for emitting a reproducing laser beam having a constant intensity. The recording and reproducing semiconductor lasers are commonly mounted in a supporting member which is mounted on a pick-up plate arranged movably in a radial direction of a rotating optical disc. The recording and reproducing laser beams are composed with each other by means of a substantially parallelogram shaped prism having a reflection surface for reflecting the reproducing laser beam and an optical surface upon which the reproducing laser beam is made incident at an incident angle larger than a critical angle and the recording laser beam is made incident at an incident angle near Brewster's angle. The composed recording and reproducing laser beams are commonly focussed by a single objective lens onto the optical disc in such a manner that the recording laser beam is made incident upon an information track to be formed and the reproducing laser beam is made incident upon a guide track or a previously recorded information track.
    • 一种光学记录和再现装置包括:第一半导体激光器,用于发射根据要记录的信息信号调制其强度的记录激光束;以及第二半导体激光器,用于发射具有恒定强度的再现激光束。 记录和再现半导体激光器通常安装在支撑构件中,支撑构件安装在沿旋转光盘的径向方向可移动地布置的拾取板上。 记录和再现激光束通过具有用于反射再现激光束的反射表面的基本上平行四边形的棱​​镜和重现激光束以大于临界的入射角入射的光学表面彼此组成 角度和记录激光束以布鲁斯特角附近的入射角入射。 组合的记录和再现激光束通常由单个物镜聚焦到光盘上,使得记录激光束入射到要形成的信息轨迹上,并且再现激光束入射到导轨上 或先前记录的信息轨道。