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    • 4. 发明授权
    • Design method of optical element and optical element through which a plurality of light beams having different design wavelengths pass
    • 具有不同设计波长的多个光束通过的光学元件和光学元件的设计方法
    • US08116187B2
    • 2012-02-14
    • US11289386
    • 2005-11-30
    • Koichi MaruyamaYoshiyuki Tashiro
    • Koichi MaruyamaYoshiyuki Tashiro
    • G11B7/135
    • G11B7/1367G02B27/42G02B27/4238G02B27/4294G11B7/1374G11B7/13922G11B2007/0006
    • A method of designing an optical element to be used for an optical system in which each of a plurality of light beams having different design wavelengths passes through the optical element is provided. The method includes determining at least two types of optical path difference functions including first and second optical path difference functions in such a manner that proportion, brought by the first optical path difference function, between diffraction orders at which diffraction efficiencies of the plurality of light beams are maximized is different from proportion, brought by the second optical path difference function, between diffraction orders at which diffraction efficiencies of the plurality of light beams are maximized, and obtaining a shape defined by combining the at least two types of optical path difference functions so as to apply the obtained shape to at least one surface of surfaces of the optical element.
    • 提供一种设计用于光学系统的光学元件的方法,其中具有不同设计波长的多个光束中的每一个通过光学元件。 该方法包括确定包括第一和第二光程差函数的至少两种类型的光程差函数,使得由第一光程差函数带来的比例在衍射级之间,衍射级之间的多个光束的衍射效率 最大化不同于由第二光程差函数引起的比例,在多个光束的衍射效率最大化的衍射级之间,并且获得通过组合至少两种类型的光程差函数而定义的形状 以将获得的形状应用于光学元件的表面的至少一个表面。
    • 5. 发明授权
    • Optical disc drive and objective lens for the same
    • 光盘驱动器和物镜相同
    • US07839752B2
    • 2010-11-23
    • US11536004
    • 2006-09-28
    • Daisuke KoreedaKoichi MaruyamaShuichi TakeuchiYoshiyuki Tashiro
    • Daisuke KoreedaKoichi MaruyamaShuichi TakeuchiYoshiyuki Tashiro
    • G11B7/135
    • G11B7/1374G11B7/1275G11B7/13922G11B2007/0006
    • There is provided an optical disc drive for recordation/reproduction for three types of optical discs by selectively using one of three types of light beams. The optical disc drive comprises an objective lens. The objective lens has a step structure which gives an optical path length difference to an incident beam at each step. When the third laser beam passes through the objective lens, the objective lens produces normal diffraction order light converging to a recording surface of the third optical disc and undesired diffraction order light converging to a point deviating from the recording surface of the third optical disc. A distance from a point to which the normal diffraction order light converges to a point to which the undesired diffraction order light converges is larger than or equal to twice a pull-in range of a focus error signal obtained when the third optical disc is used.
    • 通过选择性地使用三种类型的光束之一,提供了用于三种类型的光盘的记录/再现的光盘驱动器。 光盘驱动器包括物镜。 物镜具有在每个步骤中给入射光束的光程长度差的阶梯结构。 当第三激光束通过物镜时,物镜产生会聚到第三光盘的记录表面的正常衍射级光,并且不期望的衍射级光会聚到偏离第三光盘的记录表面的点。 从法线衍射级光收敛到不期望的衍射级光会聚的点的距离大于或等于当使用第三光盘时获得的聚焦误差信号的拉入范围的两倍。
    • 7. 发明授权
    • Objective lens for optical pick-up
    • 物镜用于光学拾取
    • US07239598B2
    • 2007-07-03
    • US10867736
    • 2004-06-16
    • Koichi MaruyamaDaisuke Koreeda
    • Koichi MaruyamaDaisuke Koreeda
    • G11B7/00
    • G11B7/1367G11B7/1275G11B7/1353G11B7/1374G11B2007/0006
    • There is provided an objective lens for an optical pick-up which is used to record/reproduce data to/from at least three types of optical discs. Thicknesses t1, t2 and t3 of cover layers of first, second third optical discs are t1≅0.6 mm, t2≅0.6 mm, and t3≅1.2 mm. Numerical apertures NA1, NA2 and NA3 for the first, second and third optical discs satisfy a relationship NA1≧NA2>NA3. When the first optical disc is used, a substantially collimated light beam is incident on the objective lens. When the second or third optical disc is used, a diverging beam is incident on the objective lens. With regard to magnifications M1, M2 and M3 and focal lengths f1, f2 and f3 of the objective lens for the first, second and third optical discs, the following conditions (1), (2) and (3) are satisfied: −0.02
    • 提供了用于光学拾取器的物镜,其用于向/从至少三种类型的光盘记录/再现数据。 第一,第二三个光盘的覆盖层的厚度t 1,t 2和t 3分别为t 1≅0.6mm,t 2≅0.6 mm,t 3≅1.2mm。 第一,第二和第三光盘的数值孔径NA 1,NA 2和NA 3满足关系NA 1> = NA 2> NA 3。 当使用第一光盘时,基本上准直的光束入射到物镜上。 当使用第二或第三光盘时,发散光束入射到物镜上。 关于用于第一,第二和第三光盘的物镜的放大率M 1,M 2和M 3以及焦距f 1,f 2和f 3,以下条件(1),(2)和(3 )满足:<?in-line-formula description =“In-line formula”end =“lead”?> - 0.02 <?in-line-formula description =“In-line Formulas”end =“lead”?> - 0.10 <?in-line-formula description =”In-line Formulas“end =”lead“?> - 0.29
    • 8. 发明申请
    • OPTICAL DISC DRIVE AND OBJECTIVE LENS FOR THE SAME
    • 光盘驱动器和目标镜头
    • US20070014211A1
    • 2007-01-18
    • US11456943
    • 2006-07-12
    • Daisuke KoreedaKoichi MaruyamaShuichi TakeuchiYoshiyuki Tashiro
    • Daisuke KoreedaKoichi MaruyamaShuichi TakeuchiYoshiyuki Tashiro
    • G11B7/00
    • G11B7/1374G11B2007/0006
    • There is provided an objective lens used for three types of optical discs including by selectively using one of three types of light beams. At least one of surfaces of the objective lens is provided with a first region converging the third light beam on a recoding surface of the third optical disc. The first region has a step structure configured to have concentric refractive surface zones and to give an optical path length difference to an incident beam at each step formed between adjacent refractive surface zones. The step structure is configured such that the optical path length difference given by each step is substantially equal to an odd multiple of a wavelength of a first light beam, and a value of differentiation of an optical path difference function defining the step structure crosses zero in a height ranging from 30% to 70% of an effective diameter of the first region.
    • 提供了一种用于三种类型的光盘的物镜,包括通过选择性地使用三种类型的光束之一。 物镜的至少一个表面设置有将第三光束会聚在第三光盘的记录表面上的第一区域。 第一区域具有构造成具有同心折射表面区域并且在相邻折射表面区域之间形成的每个台阶处的入射光束的光程长度差异的台阶结构。 台阶结构被配置为使得由每个步骤给出的光程长度差基本上等于第一光束的波长的奇数倍,并且限定步骤结构的光程差函数的微分值在零 高度为第一区域的有效直径的30%至70%。