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    • 7. 发明申请
    • ZOOM LENS AND IMAGING APPARATUS
    • 变焦镜头和成像装置
    • US20100014169A1
    • 2010-01-21
    • US12065024
    • 2007-06-28
    • Masaki Tamura
    • Masaki Tamura
    • G02B15/14
    • G02B15/177G02B15/173
    • This is addressed to provide a zoom lens which has a good optical performance for imaging device having a large number of pixels even with its simple construction, and which can also be small and thin in structure, and an imaging apparatus using the zoom lens. A zoom lens 1 is composed by arranging, in the following order from an object side, a first lens group GR1 having a weak refractive power, a second lens group GR2 having a negative refractive power, a third lens group GR3 having a positive refractive power, and a fourth lens group GR4 having a positive refractive power, and is configured to perform zooming by moving the second lens group and the third lens group. The first lens group is composed by arranging, in the order from an object side, a single lens G1 having a a negative refractive power, a prism G1 for folding an optical path, and a single lens G3 having a a positive refractive power. The second lens group is composed of one single lens G4 having a negative refractive power, and satisfies the following conditional formula (1): t2/fw
    • 这是为了提供一种即使具有简单结构也具有大量像素的成像装置具有良好光学性能的变焦透镜,并且其结构也可以是小型和薄型的,并且使用该变焦透镜的成像装置。 变焦透镜1通过从物体侧依次配置具有弱折射力的第一透镜组GR1,具有负折光力的第二透镜组GR2,具有正屈光力的第三透镜组GR3 以及具有正折射力的第四透镜组GR4,并且被配置为通过移动第二透镜组和第三透镜组来进行变焦。 第一透镜组通过以物体侧的顺序排列具有负折光力的单透镜G1,用于折叠光路的棱镜G1和具有正折光力的单透镜G3来构成。 第二透镜组由具有负屈光力的一个单透镜G4组成,并且满足以下条件式(1):t2 / fw其中t2表示构成第二透镜组的具有负折光力的单透镜的中心厚度 fw表示整个透镜系统在广角位置的焦距。
    • 9. 发明授权
    • Variable power finder and imaging apparatus
    • 可变功率寻像器和成像设备
    • US06985289B2
    • 2006-01-10
    • US11083940
    • 2005-03-21
    • Masaki Tamura
    • Masaki Tamura
    • G02B23/00G02B15/14
    • G02B23/14G02B23/145
    • A variable power finder is proposed, which comprises: an objective system; an inverting system; and an ocular system, in order from object side. The third lens group of the objective system is constituted by one lens prism having at least one reflection surface, and following expressions are satisfied: f3/fw≧2.5  (1) −1.0
    • 提出了一种可变功率寻找器,包括:客观系统; 翻转系统; 和目镜系统,从物体侧开始。 物镜系统的第三透镜组由具有至少一个反射面的一个透镜棱镜构成,并满足以下表达式:<?in-line-formula description =“In-line formula”end =“lead”?> f 3 /fw>=2.5(1)<?in-line-formula description =“In-line Formulas”end =“tail”?> <?in-line-formula description =“In-line Formulas”end =“lead “”> - 1.0 <(R 32 + R 31)/(R 32 -R 31)<1.0(2)<?在线公式描述=“在线公式”end =“tail”?> in-line-formula description =“In-line Formulas”end =“lead”?> L 1 /fw2<=0.45 1 / mm(3)<?in-line-formula description = “In-line Formulas”end =“tail”?> <?in-line-formula description =“In-line Formulas”end =“lead”?> L 2 / fw <2> > = 0.03 1 / mm(4)<?in-line-formula description =“在线公式”end =“tail”?>其中f 3是以毫米(mm)为单位的焦距,第三透镜​​组,fw是焦距 在物镜系统的广角端以毫米为单位,R 31是透镜棱镜的物体侧透镜表面的曲率半径,R 32是 透镜棱镜的像侧透镜表面的曲率半径,L 1是从透镜棱镜的中央成像面到物体侧透镜面的空气当量距离,并且L 2为距离中间成像面至像侧透镜的距离 透镜棱镜表面。