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1. WO2013161197 - ZOOM LENS AND OPTICAL EQUIPMENT HAVING SAME

Publication Number WO/2013/161197
Publication Date 31.10.2013
International Application No. PCT/JP2013/002326
International Filing Date 03.04.2013
IPC
G02B 15/20 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
16with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
20having an additional movable lens or lens group for varying the objective focal length
G02B 5/18 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
18Diffracting gratings
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 13/006
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
0055employing a special optical element
006at least one element being a compound optical element, e.g. cemented elements
G02B 13/009
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
009having zoom function
G02B 15/143105
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
143having three groups only
1431the first group being positive
143105arranged +-+
G02B 15/16
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15Optical objectives with means for varying the magnification
14by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
16with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
G02B 5/1814
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5Optical elements other than lenses
18Diffraction gratings
1814structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings
Applicants
  • 株式会社ニコン NIKON CORPORATION [JP]/[JP]
Inventors
  • 鈴木 憲三郎 SUZUKI, Kenzaburo
Agents
  • 大西 正悟 OHNISHI, Shogo
Priority Data
2012-09881224.04.2012JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) ZOOM LENS AND OPTICAL EQUIPMENT HAVING SAME
(FR) OBJECTIF ZOOM ET ÉQUIPEMENT OPTIQUE LE COMPORTANT
(JA) ズームレンズ及びこれを有する光学機器
Abstract
(EN)
In the present invention, the following are provided in order, from the object side: a first lens group (G1) having a positive refractive power; a second lens group (G2) having a negative refractive power; and a third lens group (G3) having a positive refractive power. When zooming from a wide-angle end state to a telescopic end state, the first lens group (G1) and the third lens group (G3) move towards the object side. The first lens group (G1) has a diffraction optical element (DOE) that joins two optical elements comprising an optical material in which the refractive index difference is no more than 0.45 with respect to the d line, and is provided with a diffraction optical surface (corresponding to the optical surface of curvature radius (R8) in fig. 1) on which at the interface of the two optical elements is formed a diffraction grid groove. The present invention satisfies the following conditional formulae, 0.05 < Φ1/ft < 1.00 and 3.0< Φd/y< 10.0, provided that Φ1 is the valid diameter of the surface of the first lens group (G1) that is closest to the object side; ft is the focal length of the overall system of a zoom lens (ZL) in the telescopic end state; Φd is the valid diameter of a diffraction optical surface; and y is the maximum image height of the zoom lens (ZL).
(FR)
La présente invention concerne un objectif zoom et un équipement optique le comportant. Selon l'invention, l'objectif zoom comprend les éléments suivants agencés dans l'ordre, depuis le côté objet : un premier groupe de lentilles (G1) ayant une réfringence positive ; un deuxième groupe de lentilles (G2) ayant une réfringence négative ; et un troisième groupe de lentilles (G3) ayant une réfringence positive. Lors du grossissement d'un état d'extrémité grand-angle à un état d'extrémité télescopique, le premier groupe de lentilles (G1) et le troisième groupe de lentilles (G3) se déplacent en direction du côté objet. Le premier groupe de lentilles (G1) comporte un élément optique de diffraction (DOE) qui lie deux éléments optiques comprenant un matériau optique dans lequel la différence d'indice de réfraction est d'au plus 0,45 par rapport à la ligne d, et est doté d'une surface optique de diffraction (correspondant à la surface optique de rayon de courbure [R8] à la figure 1) sur laquelle, à l'interface des deux éléments optiques, est formée une rainure de grille de diffraction. La présente invention satisfait aux formules conditionnelles suivantes, 0,05 < Φ1/ft < 1,00 et 3,0 < Φd/y < 10,0, dès lors que Φ1 est le diamètre valide de la surface du premier groupe de lentilles (G1) qui est le plus proche du côté objet ; ft est la longueur focale de tout le système d'objectif zoom (ZL) dans l'état d'extrémité télescopique ; Φd est le diamètre valide d'une surface optique de diffraction ; et y est la hauteur d'image maximale de l'objectif zoom (ZL).
(JA)
 物体側より順に並んだ、正の屈折力を持つ第1レンズ群(G1)と、負の屈折力を持つ第2レンズ群(G2)と、正の屈折力を持つ第3レンズ群(G3)とを有し、広角端状態から望遠端状態への変倍時に、第1レンズ群(G1)及び第3レンズ群(G3)がそれぞれ物体側へ移動し、第1レンズ群(G1)は、d線に対する屈折率差が0.45以下の光学材料からなる2つの光学要素を接合し、その界面に回折格子溝が形成された回折光学面(図1では曲率半径R8の光学面が該当)を備える回折光学素子(DOE)を有し、次の条件式を満たす。 0.05 < Φ1/ft < 1.00 3.0 < Φd/y < 10.0 但し、Φ1:第1レンズ群(G1)の最も物体側の面の有効径、ft:望遠端状態におけるズームレンズ(ZL)の全系の焦点距離、Φd:回折光学面の有効径、y:ズームレンズ(ZL)の最大像高。
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