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    • 3. 发明公开
    • OBJECT LENS FOR OPTICAL PICKUP DEVICE, OPTICAL PICKUP DEVICE AND OPTICAL INFORMATION RECORDING/REPRODUCING DEVICE
    • 物镜光学图像捕获装置,光学图像捕获装置和光学信息记录 - / - 播放设备
    • EP1544652A1
    • 2005-06-22
    • EP03791401.7
    • 2003-08-28
    • KONICA MINOLTA HOLDINGS, INC.
    • KIMURA, Tohru
    • G02B13/00G11B7/135
    • G11B7/1353G02B5/1895G02B27/0037G02B27/4238G02B27/4283G02B27/4294G11B7/1374G11B7/1392
    • An objective lens used for an optical pickup device wherein the optical pickup device includes: light source; and a converging optical system including the objective lens for converging a light beam emitted from the light source to an information recording surface of an optical information recording medium, and the optical pickup device is capable of recording and/or reproducing information by converging the light beam emitted from the light source to the information recording surface of the optical information recording medium with the converging optical system, the objective lens being a plastic single lens and satisfying following formulas when NA is an image-side numerical aperture required for recording and/or reproducing information to the optical information recording medium and f (mm) is a focal length of the objective lens. Even in a plastic single lens having a high NA, thermal aberration does not increase excessively, and in a plastic single lens of a refraction type, thermal aberration within the temperature range of practical use in an optical pickup device is suppressed within an allowable range. NA ≥ 0.8 1.0 > f > 0.2
    • 用于光学拾取装置worin的光拾取装置的物镜,包括:光源; 和一个聚光光学系统,包括用于在光信息的信息记录表面会聚从光源发射的光束的记录介质的物镜,以及光拾取装置能够记录和/或再现信息的由会聚光束 从光源到的光学信息记录介质的聚光光学系统中的信息记录表面发出,所述物镜是塑料单透镜的和令人满意的下述式当NA是用于记录和/或再现所需要的像侧数值孔径 信息的光信息记录介质和f(mm)是物镜的焦距。 即使在具有高NA的塑料单透镜,热像差不会过度增加,并且在折射型的塑料单透镜,在光学拾取装置中的温度范围内实际使用的范围内的热像差内的容许范围抑制。 <= DF NUM “(1)”> NA≥0.8 1.0>˚F> 0.2
    • 10. 发明公开
    • Complex objective lens, optical head, optical information apparatus, computer, optical disk player, car navigation system, optical disk recorder and optical disk server
    • 具有用于光学信息,计算机,光盘播放器的光学头装置,复杂的物镜装置
    • EP1933315A3
    • 2008-12-17
    • EP08003809.4
    • 2003-06-10
    • Panasonic Corporation
    • Komma, Yoshiaki
    • G11B7/135
    • G11B7/13925G02B5/1866G02B5/1876G02B5/1895G02B27/4294G11B7/1275G11B7/1353G11B7/1367G11B7/1374G11B7/13922G11B2007/0006
    • A complex objective lens for condensing a light beam (61, 62) onto an information recording surface (91, 101) of an optical disk (9, 10) having a base, comprising: an optical element (13; 132) having a relief structure on a surface thereof, and a refraction type lens (14; 142), thereby condensing a first light beam (61) having a wavelength λ1 in a range of 390 nm to 415 nm and a second light beam (62) having a wavelength λ2 in a range of 630 nm to 680 nm onto an information recording surface of the optical disk, wherein the optical element (13; 132) has a stepped cross-section, a height of the stepped cross-section being an integral multiple of a unit level difference d2, and the unit level difference d2 gives a difference in optical path length longer than 1 wavelength to the first light beam (61) and gives a difference in optical path length shorter than 1 wavelength to the second light beam (62), so that the unit level difference d2 substantially adds an optical path length to the first light beam and substantially subtracts an optical path length from the second light beam.
    • 上物镜(141)的全息图(131)的和构成的复合物镜,能够实现BD的稳定和高精度的兼容再生/记录具有约0.1mm的基材厚度为蓝色光束(波长“ 1)中,用约0.6mm的基材厚度为红色光束(波长“一个DVD 2)。 在全息图(131)的帧内圆周部分,一个光栅被形成,其具有的横截面形状,包括作为一个周期高度在0时间的顺序的步骤,两次,一次和三次的单位阶差 没有给出在大约一个波长的光路相对于蓝色光束的差异,在从外周侧到另一侧的光轴。 的全息图(131)发送一个蓝色光束作为0级衍射光不衍射它,并分散红色光束通过传递给国内周部为+第一级衍射光,并允许它通过在物镜被冷凝( 141)。 正因为如此,在红色光束的焦距变得比蓝色光束,由此工作距离被放大的更长的时间。