JP4804856B2 - 単焦点レンズ - Google Patents
単焦点レンズ Download PDFInfo
- Publication number
- JP4804856B2 JP4804856B2 JP2005284712A JP2005284712A JP4804856B2 JP 4804856 B2 JP4804856 B2 JP 4804856B2 JP 2005284712 A JP2005284712 A JP 2005284712A JP 2005284712 A JP2005284712 A JP 2005284712A JP 4804856 B2 JP4804856 B2 JP 4804856B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- object side
- single focus
- focus lens
- optical axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
- G02B9/14—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - +
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
- G02B9/14—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - +
- G02B9/16—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - + all the components being simple
Description
1.5>f1/f>0.6 ……(1)
69<νdA ……(2)
24<νdB<32 ……(3)
1.55>NdA ……(4)
1.65>NdB>1.48 ……(5)
1.8>L/D ……(6)
0.30<RA/f<0.40 ……(7)
ただし、
f:全体の焦点距離
f1:第1レンズの焦点距離
νdA:第1レンズのアッベ数
νdB:第2レンズのアッベ数
NdA:第1レンズのd線における屈折率
NdB:第2レンズのd線における屈折率
RA:第1レンズの物体側の面の近軸曲率半径
L:第1レンズの物体側の面から結像位置までの光軸上の距離
D:最大像高
図1は、本発明の一実施の形態に係る単焦点レンズの第1の構成例を示している。この構成例は、後述の第1の数値実施例(図3,図4)のレンズ構成に対応している。また、図2は第2の構成例を示している。図2の構成例は、後述の第2の数値実施例(図5,図6)のレンズ構成に対応している。なお、図1,図2において、符号Riは、最も物体側の構成要素の面を1番目として、像側(結像側)に向かうに従い順次増加するようにして符号を付したi番目(i=1〜8)の面の曲率半径を示す。符号Diは、i番目の面とi+1番目の面との光軸Z1上の面間隔を示す。なお、各構成例共に基本的な構成は同じなので、以下では、図1に示した単焦点レンズの構成を基本にして説明する。
第3レンズG3の物体側の面は、周辺に行くに連れて正のパワーが弱くなる形状であることが好ましい。第3レンズG3の像側の面は、近軸上において像側に凹面形状で、周辺に行くに連れて負のパワーが弱くなり、さらに周辺で正のパワーに転じる形状であることが好ましい。
1.5>f1/f>0.6 ……(1)
69<νdA ……(2)
24<νdB<32 ……(3)
1.55>NdA ……(4)
1.65>NdB>1.48 ……(5)
1.8>L/D ……(6)
0.30<RA/f<0.40 ……(7)
この単焦点レンズでは、以下で説明するように条件式(1),(6),(7)を満足してコンパクト性を確保しつつ、条件式(2),(3),(4),(5)を満足して第1レンズG1および第2レンズG2の硝材の屈折率および分散特性を最適化することで、3枚という少ないレンズ枚数ながら、コンパクトで高性能なレンズ系が実現される。
Z=C・h2/{1+(1−K・C2・h2)1/2}+A3・h3+A4・h4+A5・h5+A6・h6+A7・h7+A8・h8+A9・h9+A10・h10 ……(A)
ただし、
Z:非球面の深さ(mm)
h:光軸からレンズ面までの距離(高さ)(mm)
K:離心率
C:近軸曲率=1/R
(R:近軸曲率半径)
Ai:第i次の非球面係数
Claims (2)
- 実質的に、物体側より順に、物体側の面を凸面形状とした正のパワーの第1レンズと、近軸上において物体側の面を凹面形状とした負のメニスカスレンズの第2レンズと、近軸上において物体側の面を凸面形状とした非球面レンズの第3レンズとからなり、
かつ、以下の条件を満足するように構成されていることを特徴とする単焦点レンズ。
1.5>f1/f>0.6 ……(1)
69<νdA ……(2)
24<νdB<32 ……(3)
1.55>NdA ……(4)
1.65>NdB>1.48 ……(5)
1.8>L/D ……(6)
0.36≦RA/f≦0.37 ……(7)
ただし、
f:全体の焦点距離
f1:第1レンズの焦点距離
νdA:第1レンズのアッベ数
νdB:第2レンズのアッベ数
NdA:第1レンズのd線における屈折率
NdB:第2レンズのd線における屈折率
RA:第1レンズの物体側の面の近軸曲率半径
L:第1レンズの物体側の面から結像位置までの光軸上の距離
D:最大像高 - さらに、光軸上において前記第1レンズの像側の面よりも物体側に配置された絞りを備えたことを特徴とする請求項1に記載の単焦点レンズ。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005284712A JP4804856B2 (ja) | 2005-09-29 | 2005-09-29 | 単焦点レンズ |
CN2006101543759A CN1940626B (zh) | 2005-09-29 | 2006-09-26 | 单焦透镜 |
KR1020060094632A KR100773812B1 (ko) | 2005-09-29 | 2006-09-28 | 단초점 렌즈 |
EP06020413A EP1770424A1 (en) | 2005-09-29 | 2006-09-28 | Compact imaging lens having three single lenses |
TW095135916A TWI309728B (en) | 2005-09-29 | 2006-09-28 | Unifocal lens |
US11/528,446 US7408725B2 (en) | 2005-09-29 | 2006-09-28 | Single focus lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005284712A JP4804856B2 (ja) | 2005-09-29 | 2005-09-29 | 単焦点レンズ |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2007094113A JP2007094113A (ja) | 2007-04-12 |
JP4804856B2 true JP4804856B2 (ja) | 2011-11-02 |
Family
ID=37459499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005284712A Expired - Fee Related JP4804856B2 (ja) | 2005-09-29 | 2005-09-29 | 単焦点レンズ |
Country Status (6)
Country | Link |
---|---|
US (1) | US7408725B2 (ja) |
EP (1) | EP1770424A1 (ja) |
JP (1) | JP4804856B2 (ja) |
KR (1) | KR100773812B1 (ja) |
CN (1) | CN1940626B (ja) |
TW (1) | TWI309728B (ja) |
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-
2005
- 2005-09-29 JP JP2005284712A patent/JP4804856B2/ja not_active Expired - Fee Related
-
2006
- 2006-09-26 CN CN2006101543759A patent/CN1940626B/zh active Active
- 2006-09-28 EP EP06020413A patent/EP1770424A1/en not_active Ceased
- 2006-09-28 KR KR1020060094632A patent/KR100773812B1/ko not_active IP Right Cessation
- 2006-09-28 TW TW095135916A patent/TWI309728B/zh not_active IP Right Cessation
- 2006-09-28 US US11/528,446 patent/US7408725B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP1770424A1 (en) | 2007-04-04 |
KR20070036698A (ko) | 2007-04-03 |
US20070070526A1 (en) | 2007-03-29 |
CN1940626A (zh) | 2007-04-04 |
CN1940626B (zh) | 2012-08-29 |
JP2007094113A (ja) | 2007-04-12 |
TW200717022A (en) | 2007-05-01 |
TWI309728B (en) | 2009-05-11 |
KR100773812B1 (ko) | 2007-11-06 |
US7408725B2 (en) | 2008-08-05 |
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