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    • 10. 发明授权
    • Optical write/read unit with selective-transparency cover
    • 具有选择性透明度盖的光写/读单元
    • US4561086A
    • 1985-12-24
    • US493845
    • 1983-05-12
    • Frederick F. Geyer
    • Frederick F. Geyer
    • G11B7/0037G11B7/24G11B19/04G11B23/03G11B7/00
    • G11B19/04G11B23/0316G11B7/0037G11B7/24015
    • An optical write/read unit includes a support, an overlying record layer that is constructed for writing or reading with a predetermined light wavelength(s) and is absorptive to light of other wavelengths and a protective cover means that is selectively transparent to light of at least one of said predetermined wavelength(s). In one embodiment the disc unit is adapted for writing and reading with the same light wavelength and the cover means blocks other light wavelengths. In another embodiment the disc unit is adapted to reading with light of wavelength substantially different than the writing wavelength and the cover means selectively transmits the operative (write and read) wavelengths and selectively blocks a large proportion of other light wavelengths. In another embodiment the cover means is selectively transmissive to the reading wavelength and is displaceable to permit writing light onto the record layer.
    • 光学写入/读取单元包括支撑件,被构造用于以预定的光波长写入或读取并且吸收其它波长的光的覆盖记录层,以及对于光的选择性透明的保护盖装置 所述预定波长中的至少一个。 在一个实施例中,盘单元适于用相同的光波长进行写入和读取,并且盖装置阻挡其它光波长。 在另一个实施例中,盘单元适于用波长基本上不同于写入波长的光进行读取,并且盖装置选择性地传输操作(写入和读取)波长并且选择性地阻挡大部分其他光波长。 在另一个实施例中,盖装置对读取波长有选择地透射,并且可移位以允许将光写入到记录层上。