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1. US20070091468 - Imaging lens

官庁 アメリカ合衆国
出願番号 11639096
出願日 14.12.2006
公開番号 20070091468
公開日 26.04.2007
特許番号 7388721
特許付与日 17.06.2008
公報種別 B2
IPC
G02B 13/18
G物理学
02光学
B光学要素,光学系,または光学装置
13以下に詳細に記載される目的のために特に設計された対物レンズ
181以上の非球面レンズをもつもの,例.幾何学的収差補正用
G02B 9/16
G物理学
02光学
B光学要素,光学系,または光学装置
9複合された構成要素の数とそれらの符号,すなわち+または-による配列とによって特徴づけられた対物レンズ
123個の構成要素のみから成るもの
14#NAME?
16全ての構成要素が単レンズであるもの
G02B 13/00
G物理学
02光学
B光学要素,光学系,または光学装置
13以下に詳細に記載される目的のために特に設計された対物レンズ
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, Thiel, 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) Imaging lens
要約
(EN)

An imaging lens (100) comprising, arranged sequentially from the object side, a positive-meniscus first lens (1) with its convex plane facing the object side, a negative-power-meniscus second lens (2), and a positive-power third lens (3), the second and third lenses (2, 3) functioning as correction lenses. The first lens (1) has a strong power, and both the second and third lenses (2, 3) are aspherical on opposite planes. When the synthetic focal distance of the imaging lens is f, the focal distance of the first lens f1, the distance from the incident surface on the object side to the imaging surface of the first lens (1) Σd, and the Abbe number of the second lens √d2, the following conditional expressions are satisfied. 0.50<f1/f<1.5 (1) 0.50<Σd/f<1.5 (2) 50>√d2 (3). Accordingly, a small, low-cost imaging lens capable of high-quality imaging can be realized.