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1. WO2020063249 - ZOOM LENS AND OPTICAL DEVICE HAVING THE SAME

Publication Number WO/2020/063249
Publication Date 02.04.2020
International Application No. PCT/CN2019/103483
International Filing Date 30.08.2019
IPC
G02B 15/177 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
177having a negative front lens or group of lenses
CPC
G02B 13/02
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13Optical objectives specially designed for the purposes specified below
02Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
G02B 15/145129
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
145having five groups only
1451the first group being positive
145129arranged +-+++
G02B 15/177
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
177having a negative front lens or group of lenses
Applicants
  • ZHEJIANG DAHUA TECHNOLOGY CO., LTD. [CN]/[CN]
Inventors
  • LIU, Kai
  • LIN, Faguan
  • DING, Hongxing
Agents
  • METIS IP (CHENGDU) LLC
Priority Data
201811161664.030.09.2018CN
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) ZOOM LENS AND OPTICAL DEVICE HAVING THE SAME
(FR) OBJECTIF À FOCALE VARIABLE ET DISPOSITIF OPTIQUE METTANT EN ŒUVRE UN TEL OBJECTIF
Abstract
(EN)
Provided are a zoom lens and optical devices using the same. The zoom lens may include in order from an object side to an image side: a first lens group (G1); a second lens group (G2); a third lens group (G3); a fourth lens group (G4); and a fifth lens group (G5); wherein the zoom lens satisfies the following conditions: -1.7≤f 2/f w '≤-0.3, 0.7≤f 3/f w '≤2.1, 1.1≤f 4/f w '≤2.5, and TTL/f w '≤6.5, wherein f 2 denotes a focal length of the second lens group, f 3 denotes a focal length of the third lens group, f 4 denotes a focal length of the fourth lens group, f w ' denotes a focal length of the zoom lens, and TTL denotes a total track length of the zoom lens.
(FR)
L'invention concerne un objectif à focale variable et un dispositif optique mettant en œuvre un tel objectif. L'objectif à focale variable peut comprendre, dans l'ordre depuis un côté objet à un côté image : un premier groupe de lentilles (G1); un deuxième groupe de lentilles (G2); un troisième groupe de lentilles (G3); un quatrième groupe de lentilles (G4); et un cinquième groupe de lentilles (G5). L'objectif à focale variable satisfait les conditions suivantes : -1,7≤f 2/f w '≤-0,3, 0,7≤f 3/f w '≤2,1, 1,1≤f 4/f w '≤2,5, et TTL/f w '≤6,5, dans lesquelles f 2 désigne une longueur focale du deuxième groupe de lentilles, f 3 désigne une longueur focale du troisième groupe de lentilles, f 4 désigne une longueur focale du quatrième groupe de lentilles, f w ' désigne une longueur focale de l'objectif à focale variable, et TTL désigne une longueur de piste totale de l'objectif à focale variable.
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