JP2010107820A - Wide-angle lens - Google Patents

Wide-angle lens Download PDF

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JP2010107820A
JP2010107820A JP2008281074A JP2008281074A JP2010107820A JP 2010107820 A JP2010107820 A JP 2010107820A JP 2008281074 A JP2008281074 A JP 2008281074A JP 2008281074 A JP2008281074 A JP 2008281074A JP 2010107820 A JP2010107820 A JP 2010107820A
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lens
wide
asp
angle lens
conditional expression
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Masatoshi Hirose
全利 廣瀬
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Konica Minolta Opto Inc
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Konica Minolta Opto Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a low cost, compact wide-angle lens that has satisfactory optical performance. <P>SOLUTION: The wide-angle lens includes, in order from an object side: a first lens of negative power, which is formed from a glass spherical face; a second lens of negative power, which is formed so as to be aspherical on at least a first face; a third lens of positive power; and a fourth lens of positive power, which is aspherical at least on a first face. The wide-angle lens satisfies conditional formula expressed by 0<t23/t34<0.51, wherein t23 represents an interval between the second and third lenses, and t34 represents an interval between the third and fourth lenses. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は小型の広角レンズに関するものであり、特に固体撮像素子を用いた監視カメラ用及び車載カメラ用等のデジタル入力機器（デジタルスチルカメラ、デジタルビデオカメラ等）に好適で、光学性能が良好で、低コスト且つコンパクトな広角レンズに関するものである。   The present invention relates to a small-sized wide-angle lens, and is particularly suitable for digital input devices (such as a digital still camera and a digital video camera) for surveillance cameras and in-vehicle cameras using a solid-state imaging device, and has good optical performance. The present invention relates to a low-cost and compact wide-angle lens.

監視カメラ及び車載カメラ等に利用される固体撮像素子用の広角レンズは、従来から数多く提案されてきている（例えば、特許文献１参照）。   Many wide-angle lenses for solid-state image sensors used for surveillance cameras, in-vehicle cameras, and the like have been conventionally proposed (for example, see Patent Document 1).

また、これらで使用される固体撮像素子はＣＣＤ（Ｃｈａｒｇｅｄ Ｃｏｕｐｌｅｄ Ｄｅｖｉｃｅ）型イメージセンサの場合が多い。
特開２００７−９４０３２号公報 In many cases, the solid-state imaging device used in these is a CCD (Charged Coupled Device) type image sensor.
JP 2007-94032 A

近年、固体撮像素子として、コスト面や消費電力の面からＣＭＯＳ（Ｃｏｍｐｌｅｍｅｎｔａｒｙ Ｍｅｔａｌ Ｏｘｉｄｅ Ｓｅｍｉｃｏｎｄｕｃｔｏｒ）型イメージセンサを使用する要求も増えている。しかし、ＣＭＯＳを使用する場合、ＣＣＤよりも感度が低い為、ＦＮｏの小さいレンズが必要となり、従来の提案では充分でない。   In recent years, there has been an increasing demand for using a complementary metal oxide semiconductor (CMOS) image sensor as a solid-state imaging device in terms of cost and power consumption. However, when using a CMOS, since the sensitivity is lower than that of a CCD, a lens having a small FNo is required, and the conventional proposal is not sufficient.

本発明はかかる問題に鑑みてなされたものであり、光学性能が良好で、低コスト且つコンパクトな広角レンズを提案することを発明の目的とする。   The present invention has been made in view of such problems, and an object of the present invention is to propose a low-cost and compact wide-angle lens having good optical performance.

前記目的は、下記に記載した発明により達成される。   The object is achieved by the invention described below.

１．物体側から順に、負のパワーを有しガラス球面から成る第１レンズと、負のパワーを有し少なくとも１面が非球面に形成された第２レンズと、正のパワーを有する第３レンズと、正のパワーを有し少なくとも１面が非球面に形成された第４レンズとから構成され、以下の条件式を満足することを特徴とする広角レンズ。   1. In order from the object side, a first lens having negative power and made of a glass spherical surface, a second lens having negative power and having at least one surface formed as an aspherical surface, and a third lens having positive power And a fourth lens having a positive power and having at least one aspherical surface, and satisfying the following conditional expression:

０＜ｔ２３／ｔ３４＜０．５１・・・（１）
但し、
ｔ２３：第２レンズと第３レンズの間隔
ｔ３４：第３レンズと第４レンズの間隔
２．以下の条件式を満足することを特徴とする前記１に記載の広角レンズ。 0 <t23 / t34 <0.51 (1)
However,
t23: distance between the second lens and the third lens t34: distance between the third lens and the fourth lens 2. The wide-angle lens according to 1, wherein the following conditional expression is satisfied.

０．３＜｜ｆ１２／ｆ３４｜＜０．７・・・（２）
但し、
ｆ１２：第１レンズと第２レンズの合成焦点距離
ｆ３４：第３レンズと第４レンズの合成焦点距離
３．以下の条件式を満足することを特徴とする前記１又は前記２に記載の広角レンズ。 0.3 <| f12 / f34 | <0.7 (2)
However,
f12: Composite focal length of the first lens and the second lens f34: Composite focal length of the third lens and the fourth lens 3. The wide-angle lens according to 1 or 2 above, wherein the following conditional expression is satisfied.

１．３＜ｒ４／ｚ４＜５．０・・・（３）
但し、
ｒ４：第２レンズの像側面の最外光線が通る有効半径
ｚ４：第２レンズの像側面頂点と、最外光線及び該像側面との交点との光軸方向座標の差 1.3 <r4 / z4 <5.0 (3)
However,
r4: effective radius through which the outermost ray on the image side surface of the second lens passes z4: difference in optical axis direction coordinates between the vertex of the image side surface of the second lens and the intersection of the outermost ray and the image side surface

本発明によれば、４枚のレンズ構成で固体撮像素子用撮像レンズとして良好な性能と、低コスト且つコンパクトなＦＮｏの小さい広角レンズを提供することが可能となる。   According to the present invention, it is possible to provide a low-cost and compact wide-angle lens with a small FNo.

以下、図面を参照して、本発明の好適な実施の形態について説明する。   Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

なお、本明細書において「パワー」とは、焦点距離の逆数で定義される量を表す。   In this specification, “power” represents an amount defined by the reciprocal of the focal length.

図１〜５は、本発明の広角レンズの第１実施例乃至第５実施例のレンズ配置を表す断面図である。   1 to 5 are sectional views showing lens arrangements of the first to fifth embodiments of the wide-angle lens of the present invention.

図１〜５において、各広角レンズは、物体側から順に、負のパワーを有する第１レンズＬ１と、負のパワーを有する第２レンズＬ２と、正のパワーを有する第３レンズＬ３と、開口絞りＳと、正のパワーを有する第４レンズＬ４と、ガラスフィルタＧＦとから構成される。   1 to 5, each wide-angle lens includes, in order from the object side, a first lens L1 having negative power, a second lens L2 having negative power, a third lens L3 having positive power, and an aperture. It comprises an aperture stop S, a fourth lens L4 having a positive power, and a glass filter GF.

更に詳しくは、第１レンズＬ１はガラスから成り、両面が球面で構成され、第２レンズＬ２及び第４レンズＬ４はそれぞれプラスチックから成り、少なくとも１面が非球面に形成されている。   More specifically, the first lens L1 is made of glass, both surfaces are made of spherical surfaces, the second lens L2 and the fourth lens L4 are made of plastic, and at least one surface is aspherical.

そして、このように構成にすることにより良好な性能を得ることができる。   And it can obtain favorable performance by setting it as such.

更に、第１レンズＬ１をガラス球面レンズで構成することにより、例えば車載レンズ等に使用する場合に、別に保護カバー等を設ける必要がなくなる。   Further, by configuring the first lens L1 with a glass spherical lens, it is not necessary to provide a protective cover or the like when used for an in-vehicle lens or the like.

更に、第２レンズＬ２、第４レンズＬ４に少なくとも１面が非球面に形成されたプラスチックレンズを配置することにより、球面で構成するよりも枚数が削減できてコストダウンになり、サイズも小さくできる。   Further, by arranging plastic lenses having at least one aspherical surface on the second lens L2 and the fourth lens L4, the number of lenses can be reduced and the cost can be reduced and the size can be reduced as compared with a spherical surface. .

次に、各広角レンズ系が満足すべき条件式（１）〜（３）について説明する。   Next, conditional expressions (1) to (3) to be satisfied by each wide-angle lens system will be described.

条件式（１）はＦＮｏの小さいレンズに対応するための条件式であり、上限値を上回ると球面収差の悪化を招き、軸上性能を確保することが困難となる。   Conditional expression (1) is a conditional expression for dealing with a lens having a small FNo. When the upper limit is exceeded, spherical aberration is deteriorated, and it is difficult to ensure on-axis performance.

条件式（２）は光学性能及びレンズバックをバランスさせる条件式である。条件式（２）の下限を下回るとレンズバックの確保が困難となり、又は像面湾曲が大きくなり、性能の劣化を招く。また、上限を上回るとレンズバックが長くなり、小型化に反する。   Conditional expression (2) is a conditional expression that balances optical performance and lens back. If the lower limit of conditional expression (2) is not reached, it will be difficult to secure the lens back, or the field curvature will increase, leading to performance degradation. On the other hand, if the upper limit is exceeded, the lens back becomes longer, which is contrary to miniaturization.

条件式（３）は、光学性能に関する条件式である。条件式（３）を下回ると球面収差が悪化し、上回ると像面湾曲が大きくなる。   Conditional expression (3) is a conditional expression regarding optical performance. If the conditional expression (3) is not satisfied, the spherical aberration is deteriorated.

以下、本発明に係る実施例に関し、コンストラクションデータ及び収差図を挙げて具体的に示す。   Hereinafter, the embodiment according to the present invention will be specifically described with reference to construction data and aberration diagrams.

非球面（ＡＳＰ）と記した面は、非球面の面形状を表す以下の式で定義するものとする。   The surface described as an aspheric surface (ASP) is defined by the following expression representing the surface shape of the aspheric surface.

Ｘ（Ｈ）＝Ｃ・Ｈ２／｛１＋（１−ε・Ｃ２・Ｈ２）１／２｝＋ΣＡｉ・Ｈｉ
ε＝１＋ｋ
但し、
Ｘ（Ｈ）：高さＨの位置での光軸方向の変位量（面頂点基準）
Ｈ：光軸に対して垂直な方向の高さ
Ｃ：近軸曲率
ε：２次曲面パラメータ
Ａｉ：ｉ次の非球面係数
Ｈｉ：Ｈのｉ乗を表す記号
また、図６乃至図１０は、実施例１〜５に対応する収差図である。各収差図は、左側から順に、球面収差図、非点収差図、歪曲収差図を表している。各非点収差図において、実線Ｓはサジタル面、点線Ｍはメリディオナル面をそれぞれ表す。また、非点収差図及び歪曲収差図の縦軸は、ＸＺ断面、ＹＺ断面のそれぞれの最大画角を表す。 X (H) = C · H 2 / {1+ (1-ε · C 2 · H 2 ) 1/2 } + ΣAi · Hi
ε = 1 + k
However,
X (H): Amount of displacement in the optical axis direction at the position of height H (based on the surface vertex)
H: height in a direction perpendicular to the optical axis C: paraxial curvature ε: quadratic surface parameter Ai: i-th order aspheric coefficient Hi: symbol representing the power of i of H Further, FIG. 6 to FIG. FIG. 6 is an aberration diagram corresponding to Examples 1 to 5. Each aberration diagram shows a spherical aberration diagram, an astigmatism diagram, and a distortion diagram in order from the left side. In each astigmatism diagram, a solid line S represents a sagittal surface, and a dotted line M represents a meridional surface. The vertical axes of the astigmatism diagram and the distortion diagram represent the maximum angles of view of the XZ section and the YZ section.

次に、各実施例の光学諸値、及び条件式の値を示す。
（実施例１）
・全体諸元を以下に示す。 Next, the optical values of each example and the values of conditional expressions are shown.
Example 1
・ The overall specifications are shown below.

ｆ＝１．４０４ｍｍ
Ｆ＝２．０
・面データを以下に示す。 f = 1.404mm
F = 2.0
・ Surface data is shown below.

面番号 Ｒ（mm） Ｄ（mm） ｎｄ νｄ
１ 120.049 0.800 1.77250 49.62
２ 5.119 3.188
３（ASP） -11.468 0.800 1.52510 56.34
４（ASP） 3.559 0.657
５（ASP） 5.092 2.625 1.63550 23.89
６（ASP） -5.758 1.631
７（絞り） ∞ 0.724
８（ASP） 15.323 1.675 1.52510 56.34
９（ASP） -1.732 2.116
10 ∞ 0.300 1.51680 64.17
11 ∞ 0.500
12 ∞
・非球面係数を以下に示す。
第３面
ｋ=0,A4=5.20103E-03,A6=-3.54074E-04,A8=1.64623E-05,A10=-2.67205E-07
第４面
ｋ=0,A4=-1.41020E-03,A6=-4.13880E-04,A8=-5.45879E-05,A10=3.42211E-06
第５面
ｋ=0,A4=3.43502E-03,A6=4.29788E-06,A8=-4.66325E-05,A10=5.30999E-06
第６面
ｋ=0,A4=1.93906E-02,A6=-4.11666E-03,A8=9.90324E-04,A10=-8.07148E-05
第７面
ｋ=0,A4=-2.50774E-02,A6=-1.40461E-03,A8=8.15638E-03,A10=-1.30238E-03
第８面
ｋ=-0.4109,A4=1.28378E-02,A6=5.25713E-03,A8=-4.41012E-03,A10=1.67947E-03
・各条件式に対応する値を以下に示す。 Surface number R (mm) D (mm) nd νd
1 120.049 0.800 1.77250 49.62
2 5.119 3.188
3 (ASP) -11.468 0.800 1.52510 56.34
4 (ASP) 3.559 0.657
5 (ASP) 5.092 2.625 1.63550 23.89
6 (ASP) -5.758 1.631
7 (Aperture) ∞ 0.724
8 (ASP) 15.323 1.675 1.52510 56.34
9 (ASP) -1.732 2.116
10 ∞ 0.300 1.51680 64.17
11 ∞ 0.500
12 ∞
・ Aspheric coefficient is shown below.
3rd surface k = 0, A4 = 5.20103E-03, A6 = -3.54074E-04, A8 = 1.64623E-05, A10 = -2.67205E-07
4th surface k = 0, A4 = -1.41020E-03, A6 = -4.13880E-04, A8 = -5.45879E-05, A10 = 3.42211E-06
5th surface k = 0, A4 = 3.43502E-03, A6 = 4.29788E-06, A8 = -4.66325E-05, A10 = 5.30999E-06
6th surface k = 0, A4 = 1.93906E-02, A6 = -4.11666E-03, A8 = 9.90324E-04, A10 = -8.07148E-05
7th surface k = 0, A4 = -2.50774E-02, A6 = -1.40461E-03, A8 = 8.15638E-03, A10 = -1.30238E-03
8th surface k = -0.4109, A4 = 1.28378E-02, A6 = 5.25713E-03, A8 = -4.41012E-03, A10 = 1.67947E-03
・ Values corresponding to each conditional expression are shown below.

ｔ２３／ｔ３４＝０．２８
｜ｆ１２／ｆ３４｜＝０．５４
ｒ４／ｚ４＝２．７
（実施例２）
・全体諸元を以下に示す。 t23 / t34 = 0.28
| F12 / f34 | = 0.54
r4 / z4 = 2.7
(Example 2)
・ The overall specifications are shown below.

ｆ＝１．４２３ｍｍ
Ｆ＝２．０
・面データを以下に示す。 f = 1.423mm
F = 2.0
・ Surface data is shown below.

面番号 Ｒ（mm） Ｄ（mm） ｎｄ νｄ
１ 80.899 0.800 1.77250 49.62
２ 4.596 3.449
３（ASP） -5.463 0.800 1.52510 56.34
４（ASP） 3.331 0.200
５（ASP） 3.060 2.927 1.58340 30.23
６（ASP） -4.405 1.407
７（絞り） 1.00E+18 0.909
８（ASP） 28.513 1.608 1.52510 56.34
９（ASP） -1.732 2.100
10 ∞ 0.300 1.51680 64.17
11 ∞ 0.500
12 ∞
・非球面係数を以下に示す。
第３面
ｋ=0.4410,A4=6.23573E-03,A6=-2.58088E-04,A8=9.15881E-06,A10=8.45316E-08
第４面
ｋ=0,A4=-3.16834E-03,A6=-1.08714E-03,A8=-6.62708E-05,A10=7.38595E-06
第５面
ｋ=0,A4=1.48761E-03,A6=-5.55814E-04,A8=-7.13404E-05,A10=4.51608E-06
第６面
ｋ=0,A4=2.62279E-02,A6=-4.25637E-03,A8=1.06421E-03,A10=-1.00217E-04
第７面
ｋ=0,A4=-1.62405E-02,A6=-9.44713E-03,A8=2.17625E-02,A10=-5.10586E-03
第８面
ｋ=-0.3197,A4=0.00000E+00,A6=0.00000E+00,A8=0.00000E+00,A10=0.00000E+00
・各条件式に対応する値を以下に示す。 Surface number R (mm) D (mm) nd νd
1 80.899 0.800 1.77250 49.62
2 4.596 3.449
3 (ASP) -5.463 0.800 1.52510 56.34
4 (ASP) 3.331 0.200
5 (ASP) 3.060 2.927 1.58340 30.23
6 (ASP) -4.405 1.407
7 (Aperture) 1.00E + 18 0.909
8 (ASP) 28.513 1.608 1.52510 56.34
9 (ASP) -1.732 2.100
10 ∞ 0.300 1.51680 64.17
11 ∞ 0.500
12 ∞
・ Aspheric coefficient is shown below.
3rd surface k = 0.4410, A4 = 6.23573E-03, A6 = -2.58088E-04, A8 = 9.15881E-06, A10 = 8.45316E-08
4th surface k = 0, A4 = -3.16834E-03, A6 = -1.08714E-03, A8 = -6.62708E-05, A10 = 7.38595E-06
5th surface k = 0, A4 = 1.48761E-03, A6 = -5.55814E-04, A8 = -7.13404E-05, A10 = 4.51608E-06
6th surface k = 0, A4 = 2.62279E-02, A6 = -4.25637E-03, A8 = 1.06421E-03, A10 = -1.00217E-04
7th surface k = 0, A4 = -1.62405E-02, A6 = -9.44713E-03, A8 = 2.17625E-02, A10 = -5.10586E-03
8th surface k = -0.3197, A4 = 0.00000E + 00, A6 = 0.00000E + 00, A8 = 0.00000E + 00, A10 = 0.00000E + 00
・ Values corresponding to each conditional expression are shown below.

ｔ２３／ｔ３４＝０．０９
｜ｆ１２／ｆ３４｜＝０．３３
ｒ４／ｚ４＝３．６
（実施例３）
・全体諸元を以下に示す。 t23 / t34 = 0.09
| F12 / f34 | = 0.33
r4 / z4 = 3.6
(Example 3)
・ The overall specifications are shown below.

ｆ＝１．３３８ｍｍ
Ｆ＝２．０
・面データを以下に示す。 f = 1.338mm
F = 2.0
・ Surface data is shown below.

面番号 Ｒ（mm） Ｄ（mm） ｎｄ νｄ
１ 86.933 0.800 1.88300 40.81
２ 5.306 2.890
３（ASP） -7.681 0.800 1.52510 56.34
４（ASP） 3.074 0.763
５（ASP） 4.132 3.435 1.58340 30.23
６（ASP） -4.456 1.097
７（絞り） ∞ 0.811
８（ASP） 43.433 1.504 1.52510 56.34
９（ASP） -1.732 2.100
10 ∞ 0.300 1.51680 65.26
11 ∞ 0.500
12 ∞
・非球面係数を以下に示す。
第３面
ｋ=-166.4534,A4=3.73370E-03,A6=-4.94788E-04,A8=2.33069E-05,A10=-2.87734E-07
第４面
ｋ=0,A4=2.34087E-02,A6=-2.09639E-03,A8=-2.38968E-04,A10=1.39227E-05
第５面
ｋ=0,A4=1.16675E-02,A6=7.48872E-05,A8=-5.17262E-05,A10=-1.59965E-06
第６面
ｋ=0,A4=2.39284E-02,A6=-3.77777E-03,A8=1.07194E-03,A10=-1.34755E-04
第７面
ｋ=0,A4=-1.62306E-02,A6=-6.18292E-03,A8=3.24960E-02,A10=-9.94285E-03
第８面
ｋ=-0.3715,A4=2.81140E-02,A6=1.31207E-04,A8=-3.76207E-03,A10=3.97238E-03
・各条件式に対応する値を以下に示す。 Surface number R (mm) D (mm) nd νd
1 86.933 0.800 1.88300 40.81
2 5.306 2.890
3 (ASP) -7.681 0.800 1.52510 56.34
4 (ASP) 3.074 0.763
5 (ASP) 4.132 3.435 1.58340 30.23
6 (ASP) -4.456 1.097
7 (Aperture) ∞ 0.811
8 (ASP) 43.433 1.504 1.52510 56.34
9 (ASP) -1.732 2.100
10 ∞ 0.300 1.51680 65.26
11 ∞ 0.500
12 ∞
・ Aspheric coefficient is shown below.
3rd surface k = -166.4534, A4 = 3.73370E-03, A6 = -4.94788E-04, A8 = 2.33069E-05, A10 = -2.87734E-07
4th surface k = 0, A4 = 2.34087E-02, A6 = -2.09639E-03, A8 = -2.38968E-04, A10 = 1.39227E-05
5th surface k = 0, A4 = 1.16675E-02, A6 = 7.48872E-05, A8 = -5.17262E-05, A10 = -1.59965E-06
6th surface k = 0, A4 = 2.39284E-02, A6 = -3.77777E-03, A8 = 1.07194E-03, A10 = -1.34755E-04
7th surface k = 0, A4 = -1.62306E-02, A6 = -6.18292E-03, A8 = 3.24960E-02, A10 = -9.94285E-03
8th surface k = -0.3715, A4 = 2.81140E-02, A6 = 1.31207E-04, A8 = -3.76207E-03, A10 = 3.97238E-03
・ Values corresponding to each conditional expression are shown below.

ｔ２３／ｔ３４＝０．４０
｜ｆ１２／ｆ３４｜＝０．４９
ｒ４／ｚ４＝１．６
（実施例４）
・全体諸元を以下に示す。 t23 / t34 = 0.40
| F12 / f34 | = 0.49
r4 / z4 = 1.6
Example 4
・ The overall specifications are shown below.

ｆ＝１．４３３ｍｍ
Ｆ＝２．０
・面データを以下に示す。 f = 1.433mm
F = 2.0
・ Surface data is shown below.

面番号 Ｒ（mm） Ｄ（mm） ｎｄ νｄ
１ 34.387 0.800 1.77250 49.62
２ 4.514 2.927
３（ASP） -12.235 0.800 1.52510 56.34
４（ASP） 2.624 0.686
５（ASP） 3.801 1.822 1.63550 23.89
６（ASP） -6.127 0.898
７（絞り） ∞ 0.619
８（ASP） 13.564 1.547 1.52510 56.34
９（ASP） -1.732 2.131
10 ∞ 0.300 1.51680 65.26
11 ∞ 0.500
12 ∞
・非球面係数を以下に示す。
第３面
ｋ=0,A4=8.95053E-03,A6=-1.05473E-03,A8=2.77805E-05,A10=1.95276E-06
第４面
ｋ=0,A4=-4.94642E-03,A6=-9.63411E-04,A8=-2.25529E-04,A10=8.22359E-06
第５面
ｋ=0,A4=-2.04089E-03,A6=1.57311E-03,A8=3.05096E-04,A10=-1.89508E-05
第６面
ｋ=0,A4=2.57778E-02,A6=-2.82020E-03,A8=2.61906E-03,A10=-3.06389E-04
第７面
ｋ=0,A4=-1.40034E-02,A6=6.30059E-03,A8=1.36938E-02,A10=-4.18937E-03
第８面
ｋ=-0.5430,A4=1.39870E-02,A6=1.07976E-02,A8=-7.06696E-03,A10=3.40570E-03
・各条件式に対応する値を以下に示す。 Surface number R (mm) D (mm) nd νd
1 34.387 0.800 1.77250 49.62
2 4.514 2.927
3 (ASP) -12.235 0.800 1.52510 56.34
4 (ASP) 2.624 0.686
5 (ASP) 3.801 1.822 1.63550 23.89
6 (ASP) -6.127 0.898
7 (Aperture) ∞ 0.619
8 (ASP) 13.564 1.547 1.52510 56.34
9 (ASP) -1.732 2.131
10 ∞ 0.300 1.51680 65.26
11 ∞ 0.500
12 ∞
・ Aspheric coefficient is shown below.
3rd surface k = 0, A4 = 8.95053E-03, A6 = -1.05473E-03, A8 = 2.77805E-05, A10 = 1.95276E-06
4th surface k = 0, A4 = -4.94642E-03, A6 = -9.63411E-04, A8 = -2.25529E-04, A10 = 8.22359E-06
5th surface k = 0, A4 = -2.04089E-03, A6 = 1.57311E-03, A8 = 3.05096E-04, A10 = -1.89508E-05
6th surface k = 0, A4 = 2.57778E-02, A6 = -2.82020E-03, A8 = 2.61906E-03, A10 = -3.06389E-04
7th surface k = 0, A4 = -1.40034E-02, A6 = 6.30059E-03, A8 = 1.36938E-02, A10 = -4.18937E-03
8th surface k = -0.5430, A4 = 1.39870E-02, A6 = 1.07976E-02, A8 = -7.06696E-03, A10 = 3.40570E-03
・ Values corresponding to each conditional expression are shown below.

ｔ２３／ｔ３４＝０．４５
｜ｆ１２／ｆ３４｜＝０．６２
ｒ４／ｚ４＝２．５
（実施例５）
・全体諸元を以下に示す。 t23 / t34 = 0.45
| F12 / f34 | = 0.62
r4 / z4 = 2.5
(Example 5)
・ The overall specifications are shown below.

ｆ＝１．３９９ｍｍ
Ｆ＝２．０
・面データを以下に示す。 f = 1.399mm
F = 2.0
・ Surface data is shown below.

面番号 Ｒ（mm） Ｄ（mm） ｎｄ νｄ
１ 52.012 0.900 1.77250 49.62
２ 4.916 3.082
３（ASP） -5.638 0.800 1.53048 55.72
４（ASP） .691 1.204
５ 5.459 1.764 1.84666 23.78
６ -10.667 1.463
７（絞り） ∞ 0.945
８（ASP） 18.614 1.942 1.53048 55.72
９（ASP） -1.732 1.926
10 ∞ 0.300 1.51680 65.26
11 ∞ 0.500
12 ∞
・非球面係数を以下に示す。
第３面
ｋ=0,A4=2.24883E-02,A6=-1.86009E-03,A8=7.14771E-05,A10=-7.03625E-07
第４面
ｋ=0,A4=1.57300E-02,A6=4.91319E-03,A8=-1.34501E-03,A10=9.46128E-05
第７面
ｋ=0,A4=-3.57821E-02,A6=-2.44709E-03,A8=7.82635E-03,A10=-4.08559E-03
第８面
ｋ=-0.8736,A4=1.74083E-02,A6=-1.86502E-02,A8=6.71843E-03,A10=-1.04670E-03
・各条件式に対応する値を以下に示す。 Surface number R (mm) D (mm) nd νd
1 52.012 0.900 1.77250 49.62
2 4.916 3.082
3 (ASP) -5.638 0.800 1.53048 55.72
4 (ASP) .691 1.204
5 5.459 1.764 1.84666 23.78
6 -10.667 1.463
7 (Aperture) ∞ 0.945
8 (ASP) 18.614 1.942 1.53048 55.72
9 (ASP) -1.732 1.926
10 ∞ 0.300 1.51680 65.26
11 ∞ 0.500
12 ∞
・ Aspheric coefficient is shown below.
3rd surface k = 0, A4 = 2.24883E-02, A6 = -1.86009E-03, A8 = 7.14771E-05, A10 = -7.03625E-07
4th surface k = 0, A4 = 1.57300E-02, A6 = 4.91319E-03, A8 = -1.34501E-03, A10 = 9.46128E-05
7th surface k = 0, A4 = -3.57821E-02, A6 = -2.44709E-03, A8 = 7.82635E-03, A10 = -4.08559E-03
8th surface k = -0.8736, A4 = 1.74083E-02, A6 = -1.86502E-02, A8 = 6.71843E-03, A10 = -1.04670E-03
・ Values corresponding to each conditional expression are shown below.

ｔ２３／ｔ３４＝０．５０
｜ｆ１２／ｆ３４｜＝０．５３
ｒ４／ｚ４＝１．９ t23 / t34 = 0.50
| F12 / f34 | = 0.53
r4 / z4 = 1.9

実施例１の広角レンズのレンズ構成図である。2 is a lens configuration diagram of a wide-angle lens of Example 1. FIG. 実施例２の広角レンズのレンズ構成図である。6 is a lens configuration diagram of a wide-angle lens of Example 2. FIG. 実施例３の広角レンズのレンズ構成図である。6 is a lens configuration diagram of a wide-angle lens according to Example 3. FIG. 実施例４の広角レンズのレンズ構成図である。6 is a lens configuration diagram of a wide-angle lens according to Example 4. FIG. 実施例５の広角レンズのレンズ構成図である。6 is a lens configuration diagram of a wide-angle lens of Example 5. FIG. 実施例１の広角レンズの収差図である。FIG. 3 is an aberration diagram of the wide-angle lens of Example 1. 実施例２の広角レンズの収差図である。FIG. 6 is an aberration diagram of the wide-angle lens according to Example 2. 実施例３の広角レンズの収差図である。FIG. 6 is an aberration diagram of the wide-angle lens according to Example 3. 実施例４の広角レンズの収差図である。FIG. 6 is an aberration diagram for the wide-angle lens of Example 4. 実施例５の広角レンズの収差図である。FIG. 6 is an aberration diagram for the wide-angle lens of Example 5.

符号の説明Explanation of symbols

Ｌ１ 第１レンズ
Ｌ２ 第２レンズ
Ｌ３ 第３レンズ
Ｌ４ 第４レンズ
Ｓ 開口絞り
ＧＦ ガラスフィルタ L1 1st lens L2 2nd lens L3 3rd lens L4 4th lens S Aperture stop GF Glass filter

Claims (3)

物体側から順に、負のパワーを有しガラス球面から成る第１レンズと、負のパワーを有し少なくとも１面が非球面に形成された第２レンズと、正のパワーを有する第３レンズと、正のパワーを有し少なくとも１面が非球面に形成された第４レンズとから構成され、以下の条件式を満足することを特徴とする広角レンズ。
０＜ｔ２３／ｔ３４＜０．５１
但し、
ｔ２３：第２レンズと第３レンズの間隔
ｔ３４：第３レンズと第４レンズの間隔 In order from the object side, a first lens having negative power and made of a glass spherical surface, a second lens having negative power and having at least one surface formed as an aspherical surface, and a third lens having positive power A wide-angle lens comprising a fourth lens having positive power and at least one surface formed as an aspherical surface, and satisfying the following conditional expression:
0 <t23 / t34 <0.51
However,
t23: distance between the second lens and the third lens t34: distance between the third lens and the fourth lens 以下の条件式を満足することを特徴とする請求項１に記載の広角レンズ。
０．３＜｜ｆ１２／ｆ３４｜＜０．７
但し、
ｆ１２：第１レンズと第２レンズの合成焦点距離
ｆ３４：第３レンズと第４レンズの合成焦点距離 The wide-angle lens according to claim 1, wherein the following conditional expression is satisfied.
0.3 <| f12 / f34 | <0.7
However,
f12: Composite focal length of the first lens and the second lens f34: Composite focal length of the third lens and the fourth lens 以下の条件式を満足することを特徴とする請求項１又は請求項２に記載の広角レンズ。
１．３＜ｒ４／ｚ４＜５．０
但し、
ｒ４：第２レンズの像側面の最外光線が通る有効半径
ｚ４：第２レンズの像側面頂点と、最外光線及び該像側面との交点との光軸方向座標の差 The wide angle lens according to claim 1, wherein the following conditional expression is satisfied.
1.3 <r4 / z4 <5.0
However,
r4: effective radius through which the outermost ray on the image side surface of the second lens passes z4: difference in optical axis direction coordinates between the vertex of the image side surface of the second lens and the intersection of the outermost ray and the image side surface
JP2008281074A 2008-10-31 2008-10-31 Wide-angle lens Pending JP2010107820A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011232418A (en) * 2010-04-26 2011-11-17 Fujifilm Corp Imaging lens and imaging device
US9195033B2 (en) 2013-03-28 2015-11-24 Toshihiro Sasaya Imaging optical system and imaging equipment
CN105717610A (en) * 2014-12-17 2016-06-29 Lg伊诺特有限公司 Image Pickup Lens, and Camera Module and Digital Device Including the Same
TWI564612B (en) * 2015-09-25 2017-01-01 大立光電股份有限公司 Imaging optical system, image capturing apparatus and electronic device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011232418A (en) * 2010-04-26 2011-11-17 Fujifilm Corp Imaging lens and imaging device
US9195033B2 (en) 2013-03-28 2015-11-24 Toshihiro Sasaya Imaging optical system and imaging equipment
CN105717610A (en) * 2014-12-17 2016-06-29 Lg伊诺特有限公司 Image Pickup Lens, and Camera Module and Digital Device Including the Same
TWI564612B (en) * 2015-09-25 2017-01-01 大立光電股份有限公司 Imaging optical system, image capturing apparatus and electronic device

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