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    • 9. 发明授权
    • Optical information recording/reproducing optical system and optical information recording/reproducing apparatus
    • 光信息记录/再现光学系统和光信息记录/重放装置
    • US08305865B2
    • 2012-11-06
    • US12893268
    • 2010-09-29
    • Satoshi InoueYuta YoshidaNaoto HashimotoSuguru Takishima
    • Satoshi InoueYuta YoshidaNaoto HashimotoSuguru Takishima
    • G11B7/135
    • G11B7/1374
    • An objective lens for an optical information recording/reproducing optical system for an optical disc letting a laser beam impinge on a recording layer of the optical disc, and wherein a center wavelength λ (unit: nm) of the laser beam is in a range defined by a condition: 390≦λ≦420, a base material of the objective lens is made of resin, the resin has a glass transition temperature Tg and light transmissivity T (unit: %) per a path length of 3 mm at a wavelength of 406 nm defined by conditions: Tg≧115° C., 85≦T≦90, same antireflection films or different types of antireflection films are respectively formed on optical surfaces of the objective lens, and each of the antireflection films formed on the objective lens has a thickness of 100 nm or more in a vicinity of an optical axis of the objective lens.
    • 一种用于光盘的光学信息记录/再现光学系统的物镜,其使激光束照射在光盘的记录层上,并且其中激光束的中心波长λ(单位:nm)在限定的范围内 通过条件:390≦̸λ≦̸ 420,物镜的基材由树脂制成,树脂的玻璃化转变温度Tg和光透射率T(单位:%),每个路径长度为3mm,波长为 由条件限定的406nm:Tg≥115℃,85< NE; T< NE; 90,在物镜的光学表面上分别形成相同的防反射膜或不同类型的抗反射膜,并且形成在物镜上的每个防反射膜 在物镜的光轴附近具有100nm以上的厚度。