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1. US20130016278 - Imaging lens, imaging optical device, and digital equipment

Office
United States of America
Application Number 13637338
Application Date 22.03.2011
Publication Number 20130016278
Publication Date 17.01.2013
Grant Number 08917457
Grant Date 23.12.2014
Publication Kind B2
IPC
G02B 3/02
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
3Simple or compound lenses
02with non-spherical faces
G02B 9/62
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 –
62having six components only
CPC
G02B 13/0045
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
0045having five or more lenses
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
Applicants Matsusaka Keiji
Konica Minolta Advanced Layers, Inc.
Tanaka Hiroaki
Sano Eigo
Inventors Matsusaka Keiji
Tanaka Hiroaki
Sano Eigo
Agents Cozen O'Connor
Priority Data 2010-073254 26.03.2010 JP
2010-075858 29.03.2010 JP
Title
(EN) Imaging lens, imaging optical device, and digital equipment
Abstract
(EN)

An imaging lens system has, from an object side, at least one positive lens element convex to the object side, a negative lens element, and at least one lens element having an aspherical surface. The positive and negative lens elements are arranged next to each other. The formulae 0.1<Ton/Dopn<7, 0.1<(Rona−Ronb)/(Rona+Ronb)<1.5, and 0.3<Y′/TL<0.9 are fulfilled, where Ton represents the axial thickness of the most object-side negative lens element, Dopn represents the axial distance between the most object-side negative lens element and the positive lens element located to the object side of and next to that negative lens element, Rona represents the paraxial radius of curvature of the object-side surface of the most object-side negative lens element, Ronb represents the paraxial radius of curvature of the image-side surface of the most object-side negative lens element, Y′ represents the maximum image height, and TL represents the axial distance from the vertex of the most object-side lens surface to the image surface (in a case where a parallel-plane plate is included, the air equivalent length).


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