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    • 13. 发明公开
    • OPTICAL SCANNING DEVICE
    • 光学扫描装置
    • EP1831884A2
    • 2007-09-12
    • EP05825461.6
    • 2005-12-15
    • Koninklijke Philips Electronics N.V.
    • TUKKER, Teunis, W.VREHEN, Joris, J.HENDRIKS, Bernardus, H., W.KUIPER, Stein
    • G11B7/135G02B3/02G02B3/12
    • G11B7/13925G02B3/04G02B3/12G02B27/0031G11B7/1369G11B2007/0006
    • An optical scanning device for scanning optical record carriers having cover layers of different thicknesses. The scanning device has a first mode for scanning a first optical record carrier, a second mode for scanning a second optical record carrier and a third mode for scanning third optical record carrier. The device comprises an objective lens system and a switchable optical element having a first discrete state and a different, second discrete state. The element comprises: a fluid system including a first fluid and a different, second fluid (19) ; a wavefront modifier (17) ; and a fluid system switch for acting on the fluid system to switch between the first and second discrete states of the element. When the element is in the first discrete state, the wavefront modifier (17) is substantially covered by the first fluid, and when the element is in the second discrete state, the wavefront modifier (17) is substantially covered by the second fluid (19) . The wavefront modifier includes a non-periodic phase structure including a plurality of stepped annular zones separated by steps, the zones forming a non-periodic radial pattern, and is characterized in that the wavefront modifier further includes an aspherical surface. The scanning device is arranged to operate using the element in the second state to generate spherical aberration when in the second mode, the aspherical surface of the element in the second state compensating for more than half of the spherical aberration due to the objective lens system and second record carrier in combination.
    • 一种用于扫描具有不同厚度覆盖层的光学记录载体的光学扫描装置。 扫描装置具有用于扫描第一光学记录载体的第一模式,用于扫描第二光学记录载体的第二模式和用于扫描第三光学记录载体的第三模式。 该装置包括物镜系统和具有第一离散状态和不同的第二离散状态的可切换光学元件。 该元件包括:包括第一流体和不同的第二流体(19)的流体系统; 波前修改器(17); 以及流体系统开关,用于作用于流体系统以在元件的第一和第二离散状态之间切换。 当元件处于第一离散状态时,波前调节器(17)基本上被第一流体覆盖,并且当元件处于第二离散状态时,波前调节器(17)基本上被第二流体 )。 波前调节器包括非周期性相位结构,该非周期性相位结构包括由台阶分开的多个台阶式环形区域,这些区域形成非周期性径向图案,并且其特征在于波前调节器还包括非球面表面。 扫描装置被设置成使用处于第二状态的元件进行操作以在处于第二模式时产生球面像差,处于第二状态的元件的非球面表面补偿由于物镜系统引起的球面像差的一半以上,并且 第二个记录载体的组合。
    • 17. 发明公开
    • Objective lens system
    • Objektivlinsensystem
    • EP0750205A1
    • 1996-12-27
    • EP96108953.9
    • 1996-06-04
    • PANAVISION INTERNATIONAL, L.P.
    • Neil, Iain A.
    • G02B13/02G02B3/12G02B9/64
    • G02B7/028G02B3/12G02B13/02
    • A high performance, large aperture, long focal length visible waveband ob- jective lens system (60) comprises a telephoto objective lens group (48) spaced from a focusing lens group (49) and an auxiliary lens group (54), all supported in a support assembly (43) of fixed length. The lens groups are aligned on a common optical axis (40). The telephoto objective lens group (48) is stationary and comprises a positively powered lens element (A) and a negatively powered lens sub-group (50) containing a quintuplet lens group (51) with lens elements (B, C, D, E, F) and a lens element (G). The quintuplet lens group includes two lens elements (C and E) of liquid materials which exhibit highly abnormal partial dispersions and one solid glass lens element (F) which exhibits slightly abnormal partial dispersion. In addition, the liquid materials of lens elements (C) and (E) exhibit very large changes in refractive index with temperature and the material of lens element (F) exhibits a compensa- ting large change in refractive index with temperature. The remaining lens ele- ments of the system are common optical glass and exhibit substantially normal par- tial dispersions. The focusing lens group (49) contains a positively powered first lens group (52) and a negatively powered second lens group (53) which are inde- pendently movable along the optical axis (40) to provide continuous focusing for object to image magnifications from infinity to less than 3:1. The configuration and material selection of the lens system (60) results in a high performance, compact, low in weight, relatively inexpensive, well corrected for chromatic aberration and substantially passively athermal objective lens system.
    • 一种高性能,大光圈,长焦距可见波段物镜透镜系统(60)包括与聚焦透镜组(49)和辅助透镜组(54)间隔开的远摄物镜组(48) 固定长度的支撑组件(43)。 透镜组在公共光轴(40)上对准。 长焦物镜组(48)是静止的并且包括有功功率的透镜元件(A)和负光透镜子组(50),其包含具有透镜元件(B,C,D,E)的五重透镜组(51) ,F)和透镜元件(G)。 五重透镜组包括表现出非常异常的部分分散体的液体材料的两个透镜元件(C和E)和一个表现出略微异常的部分色散的固体玻璃透镜元件(F)。 此外,透镜元件(C)和(E)的液体材料的折射率随温度的变化非常大,并且透镜元件(F)的材料表现出随温度的折射率的补偿性大的变化。 系统的剩余镜头元件是普通的光学玻璃,表现出基本上正常的分散体。 聚焦透镜组(49)包含有功功率的第一透镜组(52)和负功率的第二透镜组(53),它们沿着光轴(40)独立地移动,以提供连续的聚焦, 无限小于3:1。 透镜系统(60)的配置和材料选择导致高色彩,紧凑,重量轻,相对便宜,对于色差和基本上被动地无热物镜系统的良好校正。