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    • 1. 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。
    • 3. 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
    • US08339925B2
    • 2012-12-25
    • US12893382
    • 2010-09-29
    • Satoshi InoueYuta YoshidaNaoto HashimotoSuguru Takishima
    • Satoshi InoueYuta YoshidaNaoto HashimotoSuguru Takishima
    • G11B7/00
    • G11B7/1374G02B13/16G11B7/1376
    • An optical information recording/reproducing optical system, comprising a light source; an optical element converting a laser beam into a substantially collimated beam; and an objective lens, wherein a wavelength λ (unit: nm) of the laser beam falls within a range of 400 115° C., each of optical surfaces is configured not to have an optical thin film which contains at least one of or elements of titanium, tantalum, hafnium, zirconium, niobium, molybdenum and chromium, each of optical surfaces of the optical element is provided with an antireflection film made of one of or a mixture of at least two of silicon oxide, aluminum oxide, aluminum fluoride and magnesium fluoride, and a following condition is satisfied ∏ i = 1 n - 1 ⁢ ( 1 - R ( BL ) ⁢ i 100 ) - ∏ i = 1 n - 1 ⁢ ( 1 - R ( UV ) ⁢ i 100 ) > 0.05 .
    • 一种光信息记录/再现光学系统,包括光源; 将激光束转换成基本上准直的光束的光学元件; 和物镜,其中激光束的波长λ(单位:nm)落在400 <λ<410的范围内,光学元件和物镜由相同的树脂材料或具有玻璃化转变的不同树脂材料制成 Tg> 115℃的温度下,每个光学表面被配置为不具有包含钛,钽,铪,锆,铌,钼和铬中的至少一种或元素的光学薄膜,每个光学表面 光学元件设置有由氧化硅,氧化铝,氟化铝和氟化镁中的至少两种中的一种或其混合物制成的抗反射膜,满足以下条件Πi = 1 n-1(1- R(BL)i 100) - Πi = 1 n - 1(1-R(UV)i 100)> 0.05。