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1. WO2013014913 - IMAGING LENS AND IMAGING DEVICE USING SAME

Publication Number WO/2013/014913
Publication Date 31.01.2013
International Application No. PCT/JP2012/004678
International Filing Date 24.07.2012
IPC
G02B 13/04 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13Optical objectives specially designed for the purposes specified below
04Reversed telephoto objectives
G02B 13/18 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13Optical objectives specially designed for the purposes specified below
18with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
CPC
G02B 13/004
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13Optical objectives specially designed for the purposes specified below
001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
0015characterised by the lens design
002having at least one aspherical surface
004having four lenses
G02B 13/04
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13Optical objectives specially designed for the purposes specified below
04Reversed telephoto objectives
G02B 13/18
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13Optical objectives specially designed for the purposes specified below
18with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
G02B 9/04
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
9Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
04having two components only
Applicants
  • 富士フイルム株式会社 FUJIFILM CORPORATION [JP]/[JP] (AllExceptUS)
  • 森 将生 MORI, Masao [JP]/[JP] (UsOnly)
Inventors
  • 森 将生 MORI, Masao
Agents
  • 柳田 征史 YANAGIDA, Masashi
Priority Data
2011-16490928.07.2011JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) IMAGING LENS AND IMAGING DEVICE USING SAME
(FR) LENTILLE D'IMAGERIE ET DISPOSITIF D'IMAGERIE UTILISANT CELLE-CI
(JA) 撮像レンズおよびこれを用いた撮像装置
Abstract
(EN)
[Power] To provide an imaging lens, wherein the lens system is compact and bright and has a wide angle and a long back focus. [Solution] The present invention comprises, in order from the object, a meniscus-shaped first lens (L1) having a negative refractive power and a convex surface facing the object, a convexo-convex second lens (L2) having a positive refractive power, a third lens (L3) having a negative refractive power and a concave surface facing the image, and a fourth lens (L4) having a positive refractive power and a convex surface facing the object, wherein condition (1): L12/f < 0.82 and condition (2): 2.3 < L12 × R2F2/f2 < 10.0 are simultaneously satisfied. In these conditions, L12 is the interval between the first lens (L1) and the second lens (L2) on the optical axis, f is the focal length of the entire lens system, and R2F is the curvature radius of the object-side lens surface of the second lens (L2).
(FR)
L'invention vise à fournir une lentille d'imagerie, le système de lentille étant compact et brillant et ayant un grand angle et une mise au point arrière longue. A cet effet, la présente invention comprend, dans l'ordre à partir de l'objet, une première lentille en forme de ménisque (L1) ayant une réfringence négative et une surface convexe tournée vers l'objet, une deuxième lentille convexo-convexe (L2) ayant une réfringence positive, une troisième lentille (L3) ayant une réfringence négative et une surface concave tournée vers l'image, et une quatrième lentille (L4) ayant une réfringence positive et une surface convexe tournée vers l'objet, la condition (1) : L12/f < 0,82 et la condition (2) : 2,3 < L12 × R2F2/f2 < 10,0 étant satisfaites de façon simultanée. Dans ces conditions, L12 est l'intervalle entre la première lentille (L1) et la deuxième lentille (L2) sur l'axe optique, f est la distance focale du système de lentille total, et R2F est le rayon de courbure de la surface de lentille côté objet de la deuxième lentille (L2).
(JA)
【課題】撮像レンズにおいて、広角でバックフォーカスが長くコンパクトで明るいレンズ系を実現する。 【解決手段】物体側より順に、物体側に凸面を向けたメニスカス形状をなす負の屈折力を有する第1レンズ(L1)、両凸形状をなす正の屈折力を有する第2レンズ(L2)、像側に凹面を向けた負の屈折力を有する第3レンズ(L3)、物体側に凸面を向けた正の屈折力を有する第4レンズ(L4)からなり、条件式(1):L12/f<0.82、条件式(2):2.3<L12×R2F/f<10.0を同時に満足する。ただし、L12を第1レンズ(L1)と第2レンズ(L2)との光軸上における間隔、fをレンズ全系の焦点距離、R2Fを第2レンズ(L2)の物体側のレンズ面の曲率半径とする。
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