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1. US20070195426 - Digital camera imaging lens

官庁 アメリカ合衆国
出願番号 11788307
出願日 19.04.2007
公開番号 20070195426
公開日 23.08.2007
特許番号 7400454
特許付与日 15.07.2008
公報種別 B2
IPC
G02B 15/14
G物理学
02光学
B光学要素,光学系,または光学装置
15変倍のための手段をもつ対物レンズ
14対物レンズの等価焦点距離を連続的に変化させるために像面に対する1個以上のレンズまたはレンズ群の軸方向移動によるもの
CPC
G02B 13/0035
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
0035having three lenses
G02B 9/16
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 -
12having three components only
14arranged + - +
16all the components being simple
G02B 13/00
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13Optical objectives specially designed for the purposes specified below
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
出願人 Nagano Optics Laboratory Corporation
発明者 Kubota Yoji
Matsui Toshio
代理人 Flynn, Theil, Boutell & Tanis, P.C.
優先権情報 2002310376 25.10.2002 JP
2002376228 26.12.2002 JP
2003295296 19.08.2003 JP
2003295320 19.08.2003 JP
発明の名称
(EN) Digital camera imaging lens
要約
(EN)

A digital camera imaging lens includes first, second and third lenses arranged in sequence from an object side toward an imaging surface side. The first lens is a meniscus lens having a positive power, whose convex surface faces the object side. The second lens is a meniscus lens having a negative power, whose concave surface faces the object side. The third lens is an aspherical lens having an inflection point on its object-side surface. An aperture stop is disposed between the first and second lenses. The imaging surface is defined by an element surface of a photosensor.