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    • 81. 发明申请
    • IMAGING LENS
    • 成像镜头
    • US20070091470A1
    • 2007-04-26
    • US11580422
    • 2006-10-12
    • Tomohiro Saito
    • Tomohiro Saito
    • G02B9/12
    • G02B13/0035G02B9/12
    • It is to provide an imaging lens that maintains optical performance and achieves reduction in size and weight. The imaging lens comprises, in order from an object side towards an image surface side, a first lens which is a meniscus lens having a positive power whose convex surface faces the object side, a diaphragm, a second lens which is a meniscus lens having a positive power whose convex surface faces the image surface side, and a third lens which is a biconcave lens having a negative power, wherein the following conditions are to be satisfied; 1.3≧L/fl≧1, 0.8≧f1/fl≧0.6, 0.1 2≧f1/f2>0, −0.1≧f1/f3≧−0.25 (where, L: entire length of the lens system [distance from the surface of the object side of the first lens to the image taking surface [air reduced length ]], fl: focal distance of the entire lens system, f1: focal distance of the first lens, f2: focal distance of the second lens, and f3: focal distance of the third lens)
    • 它是提供保持光学性能并实现尺寸和重量的减小的成像透镜。 成像透镜从物体侧朝向图像面侧依次包括作为其凸面朝向物体侧的正光焦度的弯月形透镜的第一透镜,隔膜,作为弯月形透镜的第二透镜,具有 凸面朝向图像面侧的正电力以及具有负电力的双凹透镜的第三透镜,其中满足以下条件; 1.3> = L / fl> = 1,0.8> = f 1 / f 1 = 0.6,0.1 2> = f 1 / f 2 > 0,-0.1> = f 1 / f 3 3 / / SUB >> = - 0.25(其中,L:透镜系统的整个长度[距物体表面的距离 第一透镜的一侧到图像拍摄表面[空气减小的长度]],fl:整个透镜系统的焦距,f <1 :第一透镜的焦距,f <2 < / SUB>:第二透镜的焦距和f 3 3:第三透镜的焦距)