JP2010008562A - Imaging lens - Google Patents
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Abstract
Description
本発明は、小型で明るい撮像レンズに関し、ＣＣＤ型イメージセンサ或いはＣＭＯＳ型イメージセンサ等の固体撮像素子を用いた撮像装置に好適である。 The present invention relates to a small and bright imaging lens, and is suitable for an imaging apparatus using a solid-state imaging device such as a CCD image sensor or a CMOS image sensor.
近年、ＣＣＤ型イメージセンサやＣＭＯＳ型イメージセンサ等の固体撮像素子を用いた撮像装置が搭載された携帯端末の普及の増大に伴い、より高画質の画像が得られる撮像素子を使用した撮像装置が搭載されたものが市場に供給されるようになってきた。高画素数の撮像素子は大型化を伴っていたが、近年は画素の高細化が進み、撮像素子が小型化されるようになってきた。このような高細化された撮像素子に使用される撮像レンズは高い解像力が要求されるが、解像力はＦ値により限界があり、Ｆ値の小さい明るいレンズの方が高解像力を得られるため、従来のようにＦ２．８程度のＦ値では十分な性能が得られなくなってきた。そこで、高画素化、高細化、小型化された撮像素子に適したＦ２程度の明るさの撮像レンズが求められるようになってきた。このような用途の撮像レンズとしては、３枚或いは４枚構成のレンズに比べて大口径比化及び高性能化が可能である５枚構成の撮像レンズが提案されている。 2. Description of the Related Art In recent years, with the widespread use of portable terminals equipped with an imaging device using a solid-state imaging device such as a CCD type image sensor or a CMOS type image sensor, an imaging device using an imaging device that can obtain a higher quality image is available. The installed one has been supplied to the market. An image sensor with a high number of pixels has been accompanied by an increase in size, but in recent years, an increase in the size of pixels has progressed and the image sensor has become smaller. An imaging lens used for such a high-definition imaging device is required to have a high resolving power, but the resolving power is limited by the F value, and a bright lens with a small F value can obtain a high resolving power. As in the past, with an F value of about F2.8, sufficient performance cannot be obtained. Therefore, an imaging lens having a brightness of about F2 suitable for an imaging element with high pixels, high resolution, and miniaturization has been demanded. As an imaging lens for such applications, an imaging lens having a five-lens configuration has been proposed that can have a large aperture ratio and high performance as compared with a lens having three or four lenses.
５枚構成の撮像レンズとして、物体側より順に正または負の屈折力を有する第１レンズ、正の屈折力を有する第２レンズからなる前群、開口絞り、負の屈折力を有する第３レンズ、正の屈折力を有する第４レンズ、負または正の屈折力を有する第５レンズからなる後群で構成された撮像レンズが開示されている。（例えば、特許文献１〜３参照）
しかしながら、上記特許文献１に記載の撮像レンズは、前群が球面系で構成されているためＦ２程度に明るくすると、球面収差やコマ収差の補正が不十分で良好な性能を確保できない。また、前群及び後群とも正の屈折力を有する構成のため、後群が負の屈折力を有するテレフォトタイプのような構成に比べ、光学系の主点位置が像側になり、バックフォーカスが長くなるため、小型化には不利なタイプである。 However, the imaging lens described in Patent Document 1 has a spherical front system, so that when the lens is brightened to about F2, correction of spherical aberration and coma is insufficient and good performance cannot be ensured. In addition, since the front group and the rear group have positive refractive power, the principal point position of the optical system is on the image side compared to the configuration of the telephoto type in which the rear group has negative refractive power, and the back side. Since the focus is long, it is a disadvantageous type for downsizing.
また、上記特許文献２に記載の撮像レンズは、Ｆ２程度の明るさを有しているが、第１レンズ及び第２レンズ共に正の屈折力を有する構成のため、前群での色補正が不十分である。更に、特許文献１と同様に前群及び後群とも正の屈折力を有する構成であると共に、最終レンズも正レンズであるため、小型化には不利なタイプである。 In addition, the imaging lens described in Patent Document 2 has a brightness of about F2, but since the first lens and the second lens have a positive refractive power, color correction in the front group is possible. It is insufficient. Further, as in Patent Document 1, both the front group and the rear group have a positive refractive power, and the final lens is also a positive lens, which is a disadvantageous type for downsizing.
更に、上記特許文献３に記載の撮像レンズは、Ｆ２程度の明るさを有しているが、４枚構成であるため収差補正が不十分であり、高画素化に対応した撮像レンズに適しているとは言い難い。 Furthermore, although the imaging lens described in Patent Document 3 has a brightness of about F2, it has a four-lens configuration, so aberration correction is insufficient, and is suitable for an imaging lens corresponding to an increase in the number of pixels. It ’s hard to say.
本発明はかかる問題に鑑みてなされたものであり、小型でＦ２程度の十分な明るさを有し、諸収差が良好に補正された５枚構成の撮像レンズを提供することを発明の目的とする。 The present invention has been made in view of such a problem, and an object of the present invention is to provide a five-lens imaging lens having a small size, sufficient brightness of about F2, and various aberrations corrected satisfactorily. To do.
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．固体撮像素子の光電変換部に被写体像を結像させるための撮像レンズであって、
物体側より順に、正の屈折力を有する前群と、開口絞りと、負の屈折力を有する後群とからなり、
前記前群は、負の屈折力を有する第１レンズと、正の屈折力を有する第２レンズとからなり、
前記後群は、負の屈折力を有する第３レンズと、正の屈折力を有する第４レンズと、負の屈折力を有する第５レンズとからなり、
前記第５レンズの像側面は非球面からなり、中心では負の屈折力を有し、周辺に向かうに従い負の屈折力が弱くなるような変曲点を有することを特徴とする撮像レンズ。
1. An imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device,
In order from the object side, it consists of a front group having positive refractive power, an aperture stop, and a rear group having negative refractive power,
The front group includes a first lens having a negative refractive power and a second lens having a positive refractive power,
The rear group includes a third lens having negative refractive power, a fourth lens having positive refractive power, and a fifth lens having negative refractive power,
The imaging lens according to
２．前記後群は以下の条件式を満足することを特徴とする前記１に記載の撮像レンズ。 2. 2. The imaging lens according to 1 above, wherein the rear group satisfies the following conditional expression.
−４０．０＜ｆＲ／ｆ＜−０．５・・・（１）
但し、
ｆＲ：前記後群の合成焦点距離
ｆ：前記撮像レンズ全系の焦点距離
３．前記第２レンズは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に記載の撮像レンズ。
-40.0 <fR / f <-0.5 (1)
However,
2. fR: composite focal length of the rear group f: focal length of the entire imaging lens system The imaging lens according to 1 or 2, wherein the second lens satisfies the following conditional expression.
−２．５＜（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＜−０．１・・・（２）
但し、
Ｒ３：第２レンズの物体側面の曲率半径
Ｒ４：第２レンズの像側面の曲率半径
４．以下の条件式を満足することを特徴とする前記１〜３の何れか１項に記載の撮像レンズ。
-2.5 <(R3 + R4) / (R3-R4) <-0.1 (2)
However,
R3: radius of curvature of object side surface of second lens R4: radius of curvature of image side surface of second lens The imaging lens according to any one of 1 to 3, wherein the following conditional expression is satisfied.
１０＜ν３＜３５・・・（３）
但し、
ν３：前記第３レンズのアッベ数
５．前記第１レンズ及び前記第２レンズは、それぞれ少なくとも１面が非球面であることを特徴とする前記１〜４の何れか１項に記載の撮像レンズ。
10 <ν3 <35 (3)
However,
v3: Abbe number of the
ここで、小型の撮像レンズの尺度であるが、本発明では下式を満たすレベルの小型化を目指している。この範囲を満たすことで、撮像装置全体の小型軽量化が可能となる。 Here, although it is a scale of a small imaging lens, the present invention aims at miniaturization at a level satisfying the following expression. By satisfying this range, the entire imaging apparatus can be reduced in size and weight.
Ｌ／２Ｙ＜１．３・・・（４）
但し、
Ｌ：撮像レンズ全系の最も物体側のレンズ面から像側焦点までの光軸上の距離
２Ｙ：固体撮像素子の撮像面対角線長（固体撮像素子の矩形実効画素領域の対角線長）
なお、像側焦点とは撮像レンズに光軸と平行な平行光線が入射した場合の像点をいう。
L / 2Y <1.3 (4)
However,
L: Distance on the optical axis from the lens surface closest to the object side to the image-side focal point of the entire imaging lens system 2Y: diagonal length of the imaging surface of the solid-state imaging device (diagonal length of the rectangular effective pixel region of the solid-state imaging device)
Note that the image-side focal point refers to an image point when a parallel ray parallel to the optical axis is incident on the imaging lens.
また、撮像レンズの最も像側の面と像側焦点位置との間に、光学的ローパスフィルタ、赤外線カットフィルタ、または固体撮像素子パッケージのシールガラス等の平行平板が配置される場合には、平行平板部分は空気換算距離としたうえで上記Ｌの値を計算するものとする。 In addition, when a parallel flat plate such as an optical low-pass filter, an infrared cut filter, or a seal glass of a solid-state imaging device package is disposed between the most image-side surface of the imaging lens and the image-side focal position, it is parallel. The flat plate portion is calculated as the above L value after the air conversion distance.
請求項１の効果
小型で明るく収差が良好に補正された撮像レンズを得るための本発明の基本構成は、物体側より順に、正の屈折力を有する前群と、開口絞りと、負の屈折力を有する後群とからなる。所謂テレフォトタイプのこのレンズ構成は撮像レンズ全長の小型化に有利な構成である。
The basic configuration of the present invention for obtaining a small, bright, and well-corrected imaging lens is, in order from the object side, a front group having positive refractive power, an aperture stop, and negative refraction. It consists of a rear group with power. This so-called telephoto type lens configuration is advantageous in reducing the overall length of the imaging lens.
開口絞りをレンズ内に配置する所謂インナー絞りにすると、コマ収差や倍率色収差、歪曲収差の補正が容易になるため良好な性能が得られるので、Ｆ２程度の明るい撮像レンズに適している。一方、固体撮像素子の撮像面に入射する光束の主光線入射角においては、前置絞りに較べると開口絞りが撮像面に近づくため、撮像面周辺部において主光線入射角を十分に小さくすることが難しくなるため不利となる。しかし、最近の技術では、固体撮像素子の色フィルタやオンチップマイクロレンズアレイの配列の見直しによって、シェーディングを軽減することができるようになってきた。具体的には撮像素子の撮像面の画素ピッチに対し、色フィルタやオンチップマイクロレンズアレイの配列のピッチをわずかに小さく設定すれば、撮像面の周辺部に向かうに従い各画素に対し色フィルタやオンチップマイクロレンズアレイが撮像レンズ光軸側へシフトするため、斜入射の光束を効率的に各画素の受光部に導くことができる。これにより固体撮像素子で発生するシェーディングを小さく抑えることができるため、主光線入射角に対する要求は緩和されるようになってきた。 A so-called inner diaphragm in which the aperture diaphragm is disposed in the lens facilitates correction of coma aberration, chromatic aberration of magnification, and distortion, so that good performance can be obtained. On the other hand, the chief ray incident angle of the light beam incident on the imaging surface of the solid-state image sensor should be sufficiently small at the periphery of the imaging surface because the aperture stop is closer to the imaging surface than the front diaphragm. Is disadvantageous because it becomes difficult. However, recent techniques have made it possible to reduce shading by reviewing the arrangement of the color filters of the solid-state imaging device and the on-chip microlens array. Specifically, if the pitch of the arrangement of the color filters and the on-chip microlens array is set slightly smaller than the pixel pitch of the imaging surface of the imaging device, the color filter or Since the on-chip microlens array is shifted to the optical axis side of the imaging lens, the obliquely incident light beam can be efficiently guided to the light receiving portion of each pixel. As a result, the shading generated in the solid-state imaging device can be suppressed to a small value, so that the requirement for the chief ray incident angle has been relaxed.
前記前群は、負の屈折力を有する第１レンズと、正の屈折力を有する第２レンズとからなる。このような最も物体側に負レンズが配置されたタイプは、比較的広角な光学系に適しており、諸収差の補正に有利である。また、負レンズと正レンズを組み合わせることにより、色収差の補正も容易になる。 The front group includes a first lens having a negative refractive power and a second lens having a positive refractive power. Such a type in which the negative lens is disposed on the most object side is suitable for a relatively wide-angle optical system and is advantageous for correcting various aberrations. In addition, correction of chromatic aberration is facilitated by combining a negative lens and a positive lens.
前記後群は、負の屈折力を有する第３レンズと、正の屈折力を有する第４レンズと、負の屈折力を有する第５レンズからなり、第５レンズの像側面は非球面とされ、中心では負の屈折力を有し、周辺に向かうに従い負の屈折力が弱くなる変曲点を有する。前群の負正に続き負正負と配置されるので、レンズ全系では対称的な構成になり、Ｆ２程度までの明るい撮像レンズであっても、画面周辺部まで良好な結像性能を確保した撮像レンズを得ることが可能となる。また、最も像側に配置された第５レンズの像側面を非球面とすることで、画面周辺部での諸収差を良好に補正することができる。更に、光軸から周辺に向かうに従って負の屈折力が弱くなり、また変曲点を有する非球面形状とすることで、像側光束の主光線入射角特性が確保し易くなる。 The rear group includes a third lens having negative refractive power, a fourth lens having positive refractive power, and a fifth lens having negative refractive power, and the image side surface of the fifth lens is an aspherical surface. The center has a negative refractive power and has an inflection point at which the negative refractive power becomes weaker toward the periphery. Since it is arranged as negative positive / negative following the negative / positive of the front group, the entire lens system has a symmetrical configuration, and even a bright imaging lens up to about F2 has secured good imaging performance up to the periphery of the screen. An imaging lens can be obtained. In addition, by making the image side surface of the fifth lens disposed closest to the image side an aspherical surface, various aberrations at the peripheral portion of the screen can be corrected satisfactorily. Furthermore, the negative refractive power becomes weaker from the optical axis toward the periphery, and the aspherical shape having an inflection point makes it easy to ensure the principal ray incident angle characteristics of the image-side light beam.
ここで、「変曲点」とは有効半径内でのレンズ断面形状の曲線において、非球面頂点の接平面が光軸と垂直な平面となるような非球面上の点のことである。 Here, the “inflection point” is a point on the aspheric surface where the tangent plane of the aspheric vertex is a plane perpendicular to the optical axis in the curve of the lens cross-sectional shape within the effective radius.
請求項２の効果
条件式（１）は後群の合成焦点距離を適切に設定し、撮像レンズ全長の短縮化と収差補正を適切に達成するための条件式である。条件式（１）の値が下限を上回ることで、後群の負の合成焦点距離を適度に維持することができ、レンズ全長の短縮化を達成することができる。一方、上限を下回ることで、後群の負の合成焦点距離が小さくなり過ぎず、高次の球面収差やコマ収差の発生を抑えることができる。
Effect of Claim 2 Conditional expression (1) is a conditional expression for appropriately setting the composite focal length of the rear group and appropriately achieving shortening of the entire length of the imaging lens and correction of aberration. When the value of conditional expression (1) exceeds the lower limit, the negative composite focal length of the rear group can be appropriately maintained, and shortening of the total lens length can be achieved. On the other hand, by being below the upper limit, the negative composite focal length of the rear group does not become too small, and the occurrence of higher-order spherical aberration and coma aberration can be suppressed.
また、より望ましくは下式の範囲がよい。 More preferably, the range of the following formula is good.
−２０．０＜ｆＲ／ｆ＜−０．８・・・（１’）
更に望ましくは下式の範囲がよい。
−１０．０＜ｆＲ／ｆ＜−０．９５・・・（１”）
請求項３の効果
条件式（２）は第２レンズの形状を適切に設定するための条件式である。条件式の範囲内で、第２レンズは物体側面の方が像側面より強い正の屈折力を有する形状となる。本発明の撮像レンズは、開口絞りが第２レンズの後方に配置され、しかもＦ２程度と明るい撮像レンズであるため、第２レンズの形状を条件式の範囲に設定することで、コマ収差や色収差の発生を小さく抑えている。条件式（２）の値が下限を上回ることで、前記第２レンズの物体側面の正の屈折力が強くなり過ぎるのを抑え、バランスよく収差を補正できる。また、物体側面の曲率半径が小さくなり過ぎず、レンズ加工上問題のない形状となる。一方、上限を下回ることで、第２レンズの物体側面の正の屈折力を適度に強くすることができ、球面収差、コマ収差の補正を容易にする。
-20.0 <fR / f <-0.8 (1 ')
The range of the following formula is more desirable.
-10.0 <fR / f <-0.95 (1 ")
Effect of Claim 3 Conditional expression (2) is a conditional expression for appropriately setting the shape of the second lens. Within the range of the conditional expression, the second lens has a shape having positive refractive power stronger on the object side surface than on the image side surface. Since the imaging lens of the present invention is an imaging lens having an aperture stop arranged behind the second lens and having a brightness of about F2, the coma aberration and chromatic aberration can be set by setting the shape of the second lens within the conditional expression range. Occurrence is reduced. When the value of conditional expression (2) exceeds the lower limit, it is possible to suppress the positive refractive power of the object side surface of the second lens from becoming too strong and correct aberrations in a balanced manner. Further, the radius of curvature of the object side surface does not become too small, and the lens has a shape that does not cause any problem in lens processing. On the other hand, by being below the upper limit, the positive refractive power of the object side surface of the second lens can be increased moderately, and correction of spherical aberration and coma is facilitated.
また、より望ましくは下式の範囲がよい。 More preferably, the range of the following formula is good.
−２．０＜（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＜−０．３・・・（２’）
更に望ましくは下式の範囲がよい。
−2.0 <(R3 + R4) / (R3−R4) <− 0.3 (2 ′)
The range of the following formula is more desirable.
−１．５＜（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＜−０．５・・・（２”）
請求項４の効果
条件式（３）は第３レンズのアッベ数を適切に設定し、色収差を良好に補正するための条件式である。条件式（３）の値が下限を上回ることで、軸上色収差が補正不足になるのを抑えながら、周辺光束で発生する倍率色収差を小さく抑えることができる。一方、上限を下回ることで、軸上色収差が補正過剰になるのを抑えながら、倍率色収差を小さく抑えることができる。
-1.5 <(R3 + R4) / (R3-R4) <-0.5 (2 ")
Effect of Claim 4 Conditional expression (3) is a conditional expression for appropriately setting the Abbe number of the third lens and favorably correcting chromatic aberration. When the value of the conditional expression (3) exceeds the lower limit, it is possible to suppress lateral chromatic aberration generated in the peripheral light flux while suppressing the axial chromatic aberration from being insufficiently corrected. On the other hand, when the value is below the upper limit, the lateral chromatic aberration can be suppressed to a small value while suppressing the axial chromatic aberration from being overcorrected.
また、より望ましくは下式の範囲がよい。 More preferably, the range of the following formula is good.
１７＜ν３＜３１・・・（３’）
更に望ましくは下式の範囲がよい。
17 <ν3 <31 (3 ′)
The range of the following formula is more desirable.
２１＜ν３＜３１・・・（３”）
請求項５の効果
第１レンズ及び第２レンズの少なくとも１面を非球面とすることで球面収差、コマ収差、像面湾曲を良好に補正することができる。
21 <ν3 <31 (3 ″)
Effect of
以下に本発明の撮像レンズの実施例を示す。各実施例に使用する記号は下記の通りである。
ｆ：撮像レンズ全系の焦点距離
ｆＢ：バックフォーカス
Ｆ：Ｆナンバー
２Ｙ：固体撮像素子の撮像面対角線長
ＥＮＴＰ：入射瞳位置（第１面から入射瞳位置までの距離）
ＥＸＴＰ：射出瞳位置（撮像面から射出瞳位置までの距離）
Ｈ１：前側主点位置（第１面から前側主点位置までの距離）
Ｈ２：後側主点位置（最終面から後側主点位置までの距離）
Ｒ：曲率半径
Ｄ：軸上面間隔
Ｎｄ：レンズ材料のｄ線に対する屈折率
νｄ：レンズ材料のアッベ数
各実施例において、各面番号の後に「＊」が記載されている面が非球面形状を有する面であり、非球面の形状は、面の頂点を原点とし、光軸方向にＸ軸をとり、光軸と垂直方向の高さをｈとして以下の「数１」で表す。
Examples of the imaging lens of the present invention are shown below. Symbols used in each example are as follows.
f: Focal length of the entire imaging lens system fB: Back focus F: F number 2Y: Diagonal length of the imaging surface of the solid-state imaging device ENTP: Entrance pupil position (distance from the first surface to the entrance pupil position)
EXTP: exit pupil position (distance from imaging surface to exit pupil position)
H1: Front principal point position (distance from the first surface to the front principal point position)
H2: Rear principal point position (distance from the final surface to the rear principal point position)
R: radius of curvature D: spacing between top surfaces of axis Nd: refractive index νd of lens material with respect to d-line: Abbe number of lens material In each example, the surface described with “*” after each surface number has an aspherical shape. The aspherical surface shape is expressed by the following “Equation 1”, where the vertex of the surface is the origin, the X axis is taken in the optical axis direction, and the height in the direction perpendicular to the optical axis is h.
但し、
Ａｉ：ｉ次の非球面係数
Ｒ：曲率半径
Ｋ：円錐定数
また、非球面係数において、１０のべき乗数（例えば２．５×１０−０２）をＥ（例えば２．５Ｅ−０２）を用いて表すものとする。
（実施例１）
全体諸元を以下に示す。
However,
Ai: i-th order aspherical coefficient R: radius of curvature K: conic constant Further, in the aspherical coefficient, a power of 10 (for example, 2.5 × 10-02) is used by using E (for example, 2.5E-02). It shall represent.
Example 1
The overall specifications are shown below.
ｆ＝５．４４ｍｍ
ｆＢ＝０．３２ｍｍ
Ｆ＝２．０
２Ｙ＝７．０ｍｍ
ＥＮＴＰ＝１．１８ｍｍ
ＥＸＴＰ＝−３．２１ｍｍ
Ｈ１＝−１．７４ｍｍ
Ｈ２＝−５．１１ｍｍ
面データを以下に示す。
面番号 Ｒ(mm) Ｄ(mm) Ｎｄ νｄ 有効半径(mm)
１＊ 17.351 0.45 1.6320 23 2.02
２＊ 7.411 0.05 1.78
３＊ 2.509 1.13 1.5447 56 1.63
４＊ -19.608 0.00 1.37
５（絞り） ∞ 1.00 1.24
６＊ -3.928 0.46 1.6030 28 1.40
７＊ -46.695 0.30 1.65
８＊ 8.170 1.81 1.5305 56 1.95
９＊ -1.667 0.57 2.20
10＊ -4.119 0.48 1.5305 56 2.31
11＊ 1.943 0.80 3.06
12 ∞ 0.15 1.5163 64 3.32
13 ∞ 3.58
なお、全てのレンズはプラスチック材料から形成されている。
f = 5.44mm
fB = 0.32mm
F = 2.0
2Y = 7.0mm
ENTP = 1.18mm
EXTP = -3.21mm
H1 = -1.74mm
H2 = −5.11 mm
The surface data is shown below.
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * 17.351 0.45 1.6320 23 2.02
2 * 7.411 0.05 1.78
3 * 2.509 1.13 1.5447 56 1.63
4 * -19.608 0.00 1.37
5 (Aperture) ∞ 1.00 1.24
6 * -3.928 0.46 1.6030 28 1.40
7 * -46.695 0.30 1.65
8 * 8.170 1.81 1.5305 56 1.95
9 * -1.667 0.57 2.20
10 * -4.119 0.48 1.5305 56 2.31
11 * 1.943 0.80 3.06
12 ∞ 0.15 1.5163 64 3.32
13 ∞ 3.58
All the lenses are made of a plastic material.
非球面係数を以下に示す。
第１面
K=-0.30000E+02,A4=-0.16466E-02,A6=-0.56363E-03,A8=0.26271E-04,A10=0.21387E-04,
A12=0.16094E-05
第２面
K=0.13850E+02,A4=-0.84503E-02,A6=-0.31554E-03,A8=-0.19350E-03,A10=0.51658E-04,
第３面
K=-0.28489E+00,A4=-0.26326E-02,A6=-0.76963E-05,A8=0.35438E-03,A10=-0.19408E-03
第４面
K=0.13840E+02,A4=-0.21938E-02,A6=-0.72259E-03,A8=-0.61739E-03
第６面
K=0.45580E+01,A4=-0.11107E-01,A6=0.15607E-02,A8=0.15618E-02
第７面
K=-0.30000E+02,A4=-0.23128E-01,A6=0.40359E-02,A8=0.21317E-02,A10=-0.26243E-03
第８面
K=-0.19849E+02,A4=-0.17331E-01,A6=-0.10123E-02,A8=0.67549E-03,A10=-0.17517E-04
第９面
K=-0.41227E+01,A4=-0.26815E-01,A6=0.27971E-02,A8=-0.26877E-03,
A10=-0.42401E-04,A12=0.76854E-05
第１０面
K=0.15827E+01,A4=-0.31906E-01,A6=0.61538E-02,A8=0.22896E-03,A10=-0.19588E-03,
A12=0.19638E-04
第１１面
K=-0.89764E+01,A4=-0.22094E-01,A6=0.45066E-02,A8=-0.53228E-03,A10=0.27132E-04,
A12=-0.45518E-06
単レンズデータを以下に示す。
レンズ 始面 焦点距離(mm)
１ 1 -20.83
２ 3 4.16
３ 6 -7.14
４ 8 2.79
５ 10 -2.42
各条件式に対応する値を以下に示す。
The aspheric coefficient is shown below.
First side
K = -0.30000E + 02, A4 = -0.16466E-02, A6 = -0.56363E-03, A8 = 0.26271E-04, A10 = 0.21387E-04,
A12 = 0.16094E-05
Second side
K = 0.13850E + 02, A4 = -0.84503E-02, A6 = -0.31554E-03, A8 = -0.19350E-03, A10 = 0.51658E-04,
Third side
K = -0.28489E + 00, A4 = -0.26326E-02, A6 = -0.76963E-05, A8 = 0.35438E-03, A10 = -0.19408E-03
4th page
K = 0.13840E + 02, A4 = -0.21938E-02, A6 = -0.72259E-03, A8 = -0.61739E-03
6th page
K = 0.45580E + 01, A4 = -0.11107E-01, A6 = 0.15607E-02, A8 = 0.15618E-02
7th page
K = -0.30000E + 02, A4 = -0.23128E-01, A6 = 0.40359E-02, A8 = 0.21317E-02, A10 = -0.26243E-03
8th page
K = -0.19849E + 02, A4 = -0.17331E-01, A6 = -0.10123E-02, A8 = 0.67549E-03, A10 = -0.17517E-04
9th page
K = -0.41227E + 01, A4 = -0.26815E-01, A6 = 0.27971E-02, A8 = -0.26877E-03,
A10 = -0.42401E-04, A12 = 0.76854E-05
10th page
K = 0.15827E + 01, A4 = -0.31906E-01, A6 = 0.61538E-02, A8 = 0.22896E-03, A10 = -0.19588E-03,
A12 = 0.19638E-04
11th page
K = -0.89764E + 01, A4 = -0.22094E-01, A6 = 0.45066E-02, A8 = -0.53228E-03, A10 = 0.27132E-04,
A12 = -0.45518E-06
Single lens data is shown below.
Lens Start surface Focal length (mm)
1 1 -20.83
2 3 4.16
3 6 -7.14
4 8 2.79
5 10 -2.42
The values corresponding to each conditional expression are shown below.
ｆＲ／ｆ＝−２．２２
（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＝−０．７７
ν３＝２８
Ｌ／２Ｙ＝１．０７
図１は実施例１の撮像レンズの断面図である。図中、ＧＦは前群、ＧＲは後群、Ｌ１は第１レンズ、Ｌ２は第２レンズ、Ｌ３は第３レンズ、Ｌ４は第４レンズ、Ｌ５は第５レンズ、Ｓは開口絞り、Ｉは撮像面を示す。また、Ｆは光学的ローパスフィルタやＩＲカットフィルタ、固体撮像素子のシールガラス等を想定した平行平板である。図２は実施例１の撮像レンズの収差図（球面収差、非点収差、歪曲収差）である。
（実施例２）
全体諸元を以下に示す。
fR / f = −2.22
(R3 + R4) / (R3-R4) = − 0.77
ν3 = 28
L / 2Y = 1.07
1 is a cross-sectional view of the imaging lens of Example 1. FIG. In the figure, GF is the front group, GR is the rear group, L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, S is the aperture stop, I is An imaging surface is shown. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 2 is an aberration diagram (spherical aberration, astigmatism, distortion) of the imaging lens of Example 1.
(Example 2)
The overall specifications are shown below.
ｆ＝５．４２ｍｍ
ｆＢ＝０．３０ｍｍ
Ｆ＝２．０
２Ｙ＝７．０ｍｍ
ＥＮＴＰ＝１．１５ｍｍ
ＥＸＴＰ＝−３．２４ｍｍ
Ｈ１＝−１．７２ｍｍ
Ｈ２＝−５．１２ｍｍ
面データを以下に示す。
面番号 Ｒ(mm) Ｄ(mm) Ｎｄ νｄ 有効半径(mm)
１＊ 17.432 0.45 1.6142 26 1.98
２＊ 7.660 0.05 1.75
３＊ 2.648 1.10 1.5447 56 1.60
４＊ -15.524 0.00 1.35
５（絞り） ∞ 0.99 1.25
６＊ -4.058 0.45 1.6320 23 1.40
７＊ -24.237 0.39 1.62
８＊ 8.200 1.75 1.5305 56 1.96
９＊ -1.810 0.63 2.20
10＊ -4.288 0.45 1.5305 56 2.30
11＊ 2.049 0.80 3.04
12 ∞ 0.15 1.5163 64 3.32
13 ∞ 3.36
なお、全てのレンズはプラスチック材料から形成されている。
f = 5.42mm
fB = 0.30mm
F = 2.0
2Y = 7.0mm
ENTP = 1.15mm
EXTP = -3.24mm
H1 = -1.72mm
H2 = -5.12mm
The surface data is shown below.
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * 17.432 0.45 1.6142 26 1.98
2 * 7.660 0.05 1.75
3 * 2.648 1.10 1.5447 56 1.60
4 * -15.524 0.00 1.35
5 (Aperture) ∞ 0.99 1.25
6 * -4.058 0.45 1.6320 23 1.40
7 * -24.237 0.39 1.62
8 * 8.200 1.75 1.5305 56 1.96
9 * -1.810 0.63 2.20
10 * -4.288 0.45 1.5305 56 2.30
11 * 2.049 0.80 3.04
12 ∞ 0.15 1.5163 64 3.32
13 ∞ 3.36
All the lenses are made of a plastic material.
非球面係数を以下に示す。
第１面
K=-0.30000E+02,A4=-0.32372E-02,A6=-0.62015E-03,A8=0.11982E-03,A10=0.21368E-04,
A12=-0.17127E-05
第２面
K=0.14100E+02,A4=-0.86882E-02,A6=-0.57728E-03,A8=0.33017E-04,A10=0.54213E-04
第３面
K=-0.23670E+00,A4=-0.18450E-02,A6=-0.16617E-03,A8=0.49232E-04,A10=-0.34984E-04
第４面
K=-0.18109E+01,A4=-0.19032E-02,A6=-0.18117E-02,A8=-0.49238E-04
第６面
K=0.47998E+01,A4=-0.13162E-01,A6=0.47821E-02,A8=0.13506E-02
第７面
K=0.30000E+02,A4=-0.23962E-01,A6=0.55036E-02,A8=0.19761E-02,A10=-0.29862E-03
第８面
K=-0.10978E+02,A4=-0.16919E-01,A6=-0.15537E-02,A8=0.51977E-03,A10=0.10417E-04
第９面
K=-0.46825E+01,A4=-0.27854E-01,A6=0.27813E-02,A8=-0.34763E-03,
A10=-0.45089E-04,A12=0.10352E-04
第１０面
K=0.18431E+01,A4=-0.39967E-01,A6=0.69407E-02,A8=0.28098E-03,A10=-0.22219E-03,
A12=0.22921E-04
第１１面
K=-0.89217E+01,A4=-0.25260E-01,A6=0.51634E-02,A8=-0.60339E-03,A10=0.29845E-04,
A12=-0.42542E-06
単レンズデータを以下に示す。
レンズ 始面 焦点距離(mm)
１ 1 -22.65
２ 3 4.24
３ 6 -7.78
４ 8 2.98
５ 10 -2.55
各条件式に対応する値を以下に示す。
The aspheric coefficient is shown below.
First side
K = -0.30000E + 02, A4 = -0.32372E-02, A6 = -0.62015E-03, A8 = 0.11982E-03, A10 = 0.21368E-04,
A12 = -0.17127E-05
Second side
K = 0.14100E + 02, A4 = -0.86882E-02, A6 = -0.57728E-03, A8 = 0.33017E-04, A10 = 0.54213E-04
Third side
K = -0.23670E + 00, A4 = -0.18450E-02, A6 = -0.16617E-03, A8 = 0.49232E-04, A10 = -0.34984E-04
4th page
K = -0.18109E + 01, A4 = -0.19032E-02, A6 = -0.18117E-02, A8 = -0.49238E-04
6th page
K = 0.47998E + 01, A4 = -0.13162E-01, A6 = 0.47821E-02, A8 = 0.13506E-02
7th page
K = 0.30000E + 02, A4 = -0.23962E-01, A6 = 0.55036E-02, A8 = 0.19761E-02, A10 = -0.29862E-03
8th page
K = -0.10978E + 02, A4 = -0.16919E-01, A6 = -0.15537E-02, A8 = 0.51977E-03, A10 = 0.10417E-04
9th page
K = -0.46825E + 01, A4 = -0.27854E-01, A6 = 0.27813E-02, A8 = -0.34763E-03,
A10 = -0.45089E-04, A12 = 0.10352E-04
10th page
K = 0.18431E + 01, A4 = -0.39967E-01, A6 = 0.69407E-02, A8 = 0.28098E-03, A10 = -0.22219E-03,
A12 = 0.22921E-04
11th page
K = -0.89217E + 01, A4 = -0.25260E-01, A6 = 0.51634E-02, A8 = -0.60339E-03, A10 = 0.29845E-04,
A12 = -0.42542E-06
Single lens data is shown below.
Lens Start surface Focal length (mm)
1 1 -22.65
2 3 4.24
3 6 -7.78
4 8 2.98
5 10 -2.55
The values corresponding to each conditional expression are shown below.
ｆＲ／ｆ＝−２．２５
（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＝−０．７１
ν３＝２３
Ｌ／２Ｙ＝１．０６
図３は実施例２の撮像レンズの断面図である。図中、ＧＦは前群、ＧＲは後群、Ｌ１は第１レンズ、Ｌ２は第２レンズ、Ｌ３は第３レンズ、Ｌ４は第４レンズ、Ｌ５は第５レンズ、Ｓは開口絞り、Ｉは撮像面を示す。また、Ｆは光学的ローパスフィルタやＩＲカットフィルタ、固体撮像素子のシールガラス等を想定した平行平板である。図４は実施例２の撮像レンズの収差図（球面収差、非点収差、歪曲収差）である。
（実施例３）
全体諸元を以下に示す。
fR / f = −2.25
(R3 + R4) / (R3-R4) = − 0.71
ν3 = 23
L / 2Y = 1.06
FIG. 3 is a cross-sectional view of the imaging lens of the second embodiment. In the figure, GF is the front group, GR is the rear group, L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, S is the aperture stop, I is An imaging surface is shown. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 4 is an aberration diagram (spherical aberration, astigmatism, distortion) of the imaging lens of Example 2.
(Example 3)
The overall specifications are shown below.
ｆ＝５．４４ｍｍ
ｆＢ＝０．６３ｍｍ
Ｆ＝２．０
２Ｙ＝７．０ｍｍ
ＥＮＴＰ＝１．２０ｍｍ
ＥＸＴＰ＝−２．７３ｍｍ
Ｈ１＝−２．１６ｍｍ
Ｈ２＝−４．８１ｍｍ
面データを以下に示す。
面番号 Ｒ(mm) Ｄ(mm) Ｎｄ νｄ 有効半径(mm)
１＊ 16.923 0.45 1.6320 23 2.00
２＊ 7.286 0.05 1.75
３＊ 2.398 1.15 1.5447 56 1.59
４＊ -20.377 0.00 1.33
５（絞り） ∞ 0.99 1.24
６＊ -4.025 0.45 1.6142 26 1.37
７＊ -24.086 0.26 1.58
８＊ 8.356 1.65 1.5305 56 1.83
９＊ -1.733 0.51 2.08
10＊ -3.204 0.45 1.5305 56 2.17
11＊ 2.141 0.50 2.95
12 ∞ 0.15 1.5163 64 3.17
13 ∞ 3.21
なお、全てのレンズはプラスチック材料から形成されている。
f = 5.44mm
fB = 0.63mm
F = 2.0
2Y = 7.0mm
ENTP = 1.20mm
EXTP = -2.73mm
H1 = -2.16mm
H2 = −4.81mm
The surface data is shown below.
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * 16.923 0.45 1.6320 23 2.00
2 * 7.286 0.05 1.75
3 * 2.398 1.15 1.5447 56 1.59
4 * -20.377 0.00 1.33
5 (Aperture) ∞ 0.99 1.24
6 * -4.025 0.45 1.6142 26 1.37
7 * -24.086 0.26 1.58
8 * 8.356 1.65 1.5305 56 1.83
9 * -1.733 0.51 2.08
10 * -3.204 0.45 1.5305 56 2.17
11 * 2.141 0.50 2.95
12 ∞ 0.15 1.5163 64 3.17
13 ∞ 3.21
All the lenses are made of a plastic material.
非球面係数を以下に示す。
第１面
K=-0.30000E+02,A4=-0.17711E-02,A6=-0.46788E-03,A8=0.56856E-04,A10=0.23999E-04,
A12=0.11117E-05
第２面
K=0.13860E+02,A4=-0.83775E-02,A6=-0.17611E-03,A8=-0.17655E-03,A10=0.54364E-04
第３面
K=-0.29270E+00,A4=-0.26523E-02,A6=-0.78929E-04,A8=0.34655E-03,A10=-0.22696E-03
第４面
K=0.19199E+02,A4=-0.21644E-02,A6=-0.91811E-03,A8=-0.70006E-03
第６面
K=0.51041E+01,A4=-0.91319E-02,A6=0.20709E-02,A8=0.19066E-02
第７面
K=0.30000E+02,A4=-0.25299E-01,A6=0.45398E-02,A8=0.25337E-02,A10=-0.17185E-03
第８面
K=-0.29708E+02,A4=-0.19579E-01,A6=-0.13202E-02,A8=0.58218E-03,A10=0.49736E-04
第９面
K=-0.46656E+01,A4=-0.26195E-01,A6=0.21594E-02,A8=-0.39502E-03,
A10=-0.23700E-04,A12=0.89270E-05
第１０面
K=0.12585E+00,A4=-0.32774E-01,A6=0.55432E-02,A8=0.88693E-04,A10=-0.22227E-03, A12=0.28456E-04
第１１面
K=-0.12422E+02,A4=-0.22960E-01,A6=0.46849E-02,A8=-0.59561E-03,A10=0.30363E-04,
A12=-0.34886E-06
単レンズデータを以下に示す。
レンズ 始面 焦点距離(mm)
１ 1 -20.62
２ 3 4.01
３ 6 -7.94
４ 8 2.87
５ 10 -2.35
各条件式に対応する値を以下に示す。
The aspheric coefficient is shown below.
First side
K = -0.30000E + 02, A4 = -0.17711E-02, A6 = -0.46788E-03, A8 = 0.56856E-04, A10 = 0.23999E-04,
A12 = 0.11117E-05
Second side
K = 0.13860E + 02, A4 = -0.83775E-02, A6 = -0.17611E-03, A8 = -0.17655E-03, A10 = 0.54364E-04
Third side
K = -0.29270E + 00, A4 = -0.26523E-02, A6 = -0.78929E-04, A8 = 0.34655E-03, A10 = -0.22696E-03
4th page
K = 0.19199E + 02, A4 = -0.21644E-02, A6 = -0.91811E-03, A8 = -0.70006E-03
6th page
K = 0.51041E + 01, A4 = -0.91319E-02, A6 = 0.20709E-02, A8 = 0.19066E-02
7th page
K = 0.30000E + 02, A4 = -0.25299E-01, A6 = 0.45398E-02, A8 = 0.25337E-02, A10 = -0.17185E-03
8th page
K = -0.29708E + 02, A4 = -0.19579E-01, A6 = -0.13202E-02, A8 = 0.58218E-03, A10 = 0.49736E-04
9th page
K = -0.46656E + 01, A4 = -0.26195E-01, A6 = 0.21594E-02, A8 = -0.39502E-03,
A10 = -0.23700E-04, A12 = 0.89270E-05
10th page
K = 0.12585E + 00, A4 = -0.32774E-01, A6 = 0.55432E-02, A8 = 0.88693E-04, A10 = -0.22227E-03, A12 = 0.28456E-04
11th page
K = -0.12422E + 02, A4 = -0.22960E-01, A6 = 0.46849E-02, A8 = -0.59561E-03, A10 = 0.30363E-04,
A12 = -0.34886E-06
Single lens data is shown below.
Lens Start surface Focal length (mm)
1 1 -20.62
2 3 4.01
3 6 -7.94
4 8 2.87
5 10 -2.35
The values corresponding to each conditional expression are shown below.
ｆＲ／ｆ＝−１．６８
（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＝−０．７９
ν３＝２６
Ｌ／２Ｙ＝１．０２
図５は実施例３の撮像レンズの断面図である。図中、ＧＦは前群、ＧＲは後群、Ｌ１は第１レンズ、Ｌ２は第２レンズ、Ｌ３は第３レンズ、Ｌ４は第４レンズ、Ｌ５は第５レンズ、Ｓは開口絞り、Ｉは撮像面を示す。また、Ｆは光学的ローパスフィルタやＩＲカットフィルタ、固体撮像素子のシールガラス等を想定した平行平板である。図６は実施例３の撮像レンズの収差図（球面収差、非点収差、歪曲収差）である。
（実施例４）
全体諸元を以下に示す。
fR / f = −1.68
(R3 + R4) / (R3-R4) = − 0.79
ν3 = 26
L / 2Y = 1.02
FIG. 5 is a cross-sectional view of the imaging lens of the third embodiment. In the figure, GF is the front group, GR is the rear group, L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, S is the aperture stop, I is An imaging surface is shown. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 6 is an aberration diagram (spherical aberration, astigmatism, distortion) of the imaging lens of Example 3.
Example 4
The overall specifications are shown below.
ｆ＝５．４６ｍｍ
ｆＢ＝０．６１ｍｍ
Ｆ＝２．０
２Ｙ＝７．０ｍｍ
ＥＮＴＰ＝１．２５ｍｍ
ＥＸＴＰ＝−２．３６ｍｍ
Ｈ１＝−３．３５ｍｍ
Ｈ２＝−４．８５ｍｍ
面データを以下に示す。
面番号 Ｒ(mm) Ｄ(mm) Ｎｄ νｄ 有効半径(mm)
１＊ 15.213 0.50 1.6320 23 2.04
２＊ 6.990 0.05 1.72
３＊ 2.095 1.10 1.5447 56 1.56
４＊ -61.868 0.02 1.33
５（絞り） ∞ 1.08 1.25
６＊ -4.070 0.50 1.6320 23 1.32
７＊ -7.985 0.24 1.52
８＊ 18.697 0.86 1.5447 56 1.72
９＊ -2.211 0.43 1.98
10＊ -3.459 0.50 1.5305 56 2.08
11＊ 2.011 0.50 2.77
12 ∞ 0.15 1.5163 64 3.09
13 ∞ 3.13
なお、全てのレンズはプラスチック材料から形成されている。
f = 5.46mm
fB = 0.61mm
F = 2.0
2Y = 7.0mm
ENTP = 1.25mm
EXTP = -2.36mm
H1 = −3.35mm
H2 = -4.85mm
The surface data is shown below.
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * 15.213 0.50 1.6320 23 2.04
2 * 6.990 0.05 1.72
3 * 2.095 1.10 1.5447 56 1.56
4 * -61.868 0.02 1.33
5 (Aperture) ∞ 1.08 1.25
6 * -4.070 0.50 1.6320 23 1.32
7 * -7.985 0.24 1.52
8 * 18.697 0.86 1.5447 56 1.72
9 * -2.211 0.43 1.98
10 * -3.459 0.50 1.5305 56 2.08
11 * 2.011 0.50 2.77
12 ∞ 0.15 1.5163 64 3.09
13 ∞ 3.13
All the lenses are made of a plastic material.
非球面係数を以下に示す。
第１面
K=-0.17124E+02,A4=-0.19458E-02,A6=-0.44793E-03,A8=0.21563E-03,A10=0.21072E-04,
A12=0.23917E-06
第２面
K=0.13915E+02,A4=-0.81598E-02,A6=0.81564E-04,A8=-0.43635E-04,A10=0.73839E-04
第３面
K=-0.29675E+00,A4=-0.25158E-02,A6=0.58812E-03,A8=0.37572E-03,A10=-0.29406E-03
第４面
K=-0.30000E+02,A4=-0.95539E-03,A6=-0.16207E-02,A8=-0.68290E-03
第６面
K=0.68605E+01,A4=-0.13656E-01,A6=0.22698E-02,A8=0.30218E-02
第７面
K=0.21995E+02,A4=-0.30802E-01,A6=0.42659E-02,A8=0.36050E-02,A10=0.74499E-03
第８面
K=0.30000E+02,A4=-0.26939E-01,A6=-0.28093E-02,A8=0.58006E-03,A10=0.17610E-03
第９面
K=-0.11136E+02,A4=-0.14065E-01,A6=0.35956E-02,A8=-0.37378E-03,
A10=-0.44465E-04,A12=0.95699E-05
第１０面
K=0.10815E+00,A4=-0.29406E-01,A6=0.72814E-02,A8=0.90923E-05,A10=-0.22210E-03,
A12=0.30612E-04
第１１面
K=-0.19106E+02,A4=-0.21402E-01,A6=0.41184E-02,A8=-0.62693E-03,A10=0.38748E-04,
A12=-0.87975E-06
単レンズデータを以下に示す。
レンズ 始面 焦点距離(mm)
１ 1 -20.96
２ 3 3.74
３ 6 -13.82
４ 8 3.68
５ 10 -2.32
各条件式に対応する値を以下に示す。
The aspheric coefficient is shown below.
First side
K = -0.17124E + 02, A4 = -0.19458E-02, A6 = -0.44793E-03, A8 = 0.21563E-03, A10 = 0.21072E-04,
A12 = 0.23917E-06
Second side
K = 0.13915E + 02, A4 = -0.81598E-02, A6 = 0.81564E-04, A8 = -0.43635E-04, A10 = 0.73839E-04
Third side
K = -0.29675E + 00, A4 = -0.25158E-02, A6 = 0.58812E-03, A8 = 0.37572E-03, A10 = -0.29406E-03
4th page
K = -0.30000E + 02, A4 = -0.95539E-03, A6 = -0.16207E-02, A8 = -0.68290E-03
6th page
K = 0.68605E + 01, A4 = -0.13656E-01, A6 = 0.22698E-02, A8 = 0.30218E-02
7th page
K = 0.21995E + 02, A4 = -0.30802E-01, A6 = 0.42659E-02, A8 = 0.36050E-02, A10 = 0.74499E-03
8th page
K = 0.30000E + 02, A4 = -0.26939E-01, A6 = -0.28093E-02, A8 = 0.58006E-03, A10 = 0.17610E-03
9th page
K = -0.11136E + 02, A4 = -0.14065E-01, A6 = 0.35956E-02, A8 = -0.37378E-03,
A10 = -0.44465E-04, A12 = 0.95699E-05
10th page
K = 0.10815E + 00, A4 = -0.29406E-01, A6 = 0.72814E-02, A8 = 0.90923E-05, A10 = -0.22210E-03,
A12 = 0.30612E-04
11th page
K = -0.19106E + 02, A4 = -0.21402E-01, A6 = 0.41184E-02, A8 = -0.62693E-03, A10 = 0.38748E-04,
A12 = -0.87975E-06
Single lens data is shown below.
Lens Start surface Focal length (mm)
1 1 -20.96
2 3 3.74
3 6 -13.82
4 8 3.68
5 10 -2.32
The values corresponding to each conditional expression are shown below.
ｆＲ／ｆ＝−１．０２
（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＝−０．９３
ν３＝２３
Ｌ／２Ｙ＝０．９３
図７は実施例４の撮像レンズの断面図である。図中、ＧＦは前群、ＧＲは後群、Ｌ１は第１レンズ、Ｌ２は第２レンズ、Ｌ３は第３レンズ、Ｌ４は第４レンズ、Ｌ５は第５レンズ、Ｓは開口絞り、Ｉは撮像面を示す。また、Ｆは光学的ローパスフィルタやＩＲカットフィルタ、固体撮像素子のシールガラス等を想定した平行平板である。図８は実施例４の撮像レンズの収差図（球面収差、非点収差、歪曲収差）である。
（実施例５）
全体諸元を以下に示す。
fR / f = −1.02
(R3 + R4) / (R3-R4) = − 0.93
ν3 = 23
L / 2Y = 0.93
FIG. 7 is a sectional view of the imaging lens of Example 4. In the figure, GF is the front group, GR is the rear group, L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, S is the aperture stop, I is An imaging surface is shown. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 8 is an aberration diagram (spherical aberration, astigmatism, distortion) of the imaging lens of Example 4.
(Example 5)
The overall specifications are shown below.
ｆ＝５．８６ｍｍ
ｆＢ＝０．７９ｍｍ
Ｆ＝２．０
２Ｙ＝７．０ｍｍ
ＥＮＴＰ＝１．５９ｍｍ
ＥＸＴＰ＝−３．５１ｍｍ
Ｈ１＝−０．５５ｍｍ
Ｈ２＝−５．０７４ｍｍ
面データを以下に示す。
面番号 Ｒ(mm) Ｄ(mm) Ｎｄ νｄ 有効半径(mm)
１＊ 10.495 0.57 1.5830 30 2.04
２＊ 5.014 0.05 1.72
３＊ 2.491 1.41 1.5891 61 1.56
４＊ -33.673 0.05 1.33
５（絞り） ∞ 1.36 1.28
６＊ -2.049 0.50 1.6320 23 1.32
７＊ -2.675 0.11 1.52
８＊ -6.311 1.10 1.5447 56 1.72
９＊ -1.362 0.29 1.98
10＊ -4.226 0.63 1.5305 56 2.08
11＊ 2.204 0.80 2.77
12 ∞ 0.15 1.5163 64 3.09
13 ∞ 3.13
なお、第１レンズ、第３レンズ、第４レンズ、及び第５レンズはプラスチック材料から形成され、第２レンズはガラス材料から形成されている。
f = 5.86mm
fB = 0.79mm
F = 2.0
2Y = 7.0mm
ENTP = 1.59mm
EXTP = -3.51mm
H1 = −0.55mm
H2 = −5.074mm
The surface data is shown below.
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * 10.495 0.57 1.5830 30 2.04
2 * 5.014 0.05 1.72
3 * 2.491 1.41 1.5891 61 1.56
4 * -33.673 0.05 1.33
5 (Aperture) ∞ 1.36 1.28
6 * -2.049 0.50 1.6320 23 1.32
7 * -2.675 0.11 1.52
8 * -6.311 1.10 1.5447 56 1.72
9 * -1.362 0.29 1.98
10 * -4.226 0.63 1.5305 56 2.08
11 * 2.204 0.80 2.77
12 ∞ 0.15 1.5163 64 3.09
13 ∞ 3.13
The first lens, the third lens, the fourth lens, and the fifth lens are made of a plastic material, and the second lens is made of a glass material.
非球面係数を以下に示す。
第１面
K=0.14255E+02
第２面
K=0.55655E+01,A4=-0.15414E-02,A6=0.54643E-03,A8=-0.22362E-04,A10=-0.13852E-04
第３面
K=-0.17446E+00,A4=-0.27014E-02,A6=0.11305E-02,A8=-0.23933E-03,A10=-0.35301E-04
第４面
K=0.26748E+02,A4=-0.51658E-02,A6=-0.12500E-02,A8=-0.14038E-03
第６面
K=0.51888E+00,A4=0.18990E-01,A6=0.11730E-02,A8=0.23092E-02
第７面
K=-0.39105E+01
第８面
K=0.10559E+02
第９面
K=-0.32120E+01,A4=-0.12388E-01,A6=0.12736E-02,A8=0.15303E-04,A10=0.26358E-03,
A12=-0.41524E-04
第１０面
K=-0.23294E+02,A4=-0.13624E-02,A6=-0.35303E-03,A8=0.30369E-03,
A10=-0.36927E-04,A12=0.13238E-05
第１１面
K=-0.11436E+02,A4=-0.16072E-01,A6=0.27815E-02,A8=-0.46962E-03,A10=0.38148E-04,
A12=-0.11995E-05
単レンズデータを以下に示す。
レンズ 始面 焦点距離(mm)
１ 1 -17.12
２ 3 3.99
３ 6 -20.04
４ 8 2.96
５ 10 -2.64
各条件式に対応する値を以下に示す。
The aspheric coefficient is shown below.
First side
K = 0.14255E + 02
Second side
K = 0.55655E + 01, A4 = -0.15414E-02, A6 = 0.54643E-03, A8 = -0.22362E-04, A10 = -0.13852E-04
Third side
K = -0.17446E + 00, A4 = -0.27014E-02, A6 = 0.11305E-02, A8 = -0.23933E-03, A10 = -0.35301E-04
4th page
K = 0.26748E + 02, A4 = -0.51658E-02, A6 = -0.12500E-02, A8 = -0.14038E-03
6th page
K = 0.51888E + 00, A4 = 0.18990E-01, A6 = 0.11730E-02, A8 = 0.23092E-02
7th page
K = -0.39105E + 01
8th page
K = 0.10559E + 02
9th page
K = -0.32120E + 01, A4 = -0.12388E-01, A6 = 0.12736E-02, A8 = 0.15303E-04, A10 = 0.26358E-03,
A12 = -0.41524E-04
10th page
K = -0.23294E + 02, A4 = -0.13624E-02, A6 = -0.35303E-03, A8 = 0.30369E-03,
A10 = -0.36927E-04, A12 = 0.13238E-05
11th page
K = -0.11436E + 02, A4 = -0.16072E-01, A6 = 0.27815E-02, A8 = -0.46962E-03, A10 = 0.38148E-04,
A12 = -0.11995E-05
Single lens data is shown below.
Lens Start surface Focal length (mm)
1 1 -17.12
2 3 3.99
3 6 -20.04
4 8 2.96
5 10 -2.64
The values corresponding to each conditional expression are shown below.
ｆＲ／ｆ＝−３．４２
（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＝−０．８６
ν３＝２３
Ｌ／２Ｙ＝１．１１
図９は実施例５の撮像レンズの断面図である。図中、ＧＦは前群、ＧＲは後群、Ｌ１は第１レンズ、Ｌ２は第２レンズ、Ｌ３は第３レンズ、Ｌ４は第４レンズ、Ｌ５は第５レンズ、Ｓは開口絞り、Ｉは撮像面を示す。また、Ｆは光学的ローパスフィルタやＩＲカットフィルタ、固体撮像素子のシールガラス等を想定した平行平板である。図１０は実施例５の撮像レンズの収差図（球面収差、非点収差、歪曲収差）である。
（実施例６）
全体諸元を以下に示す。
fR / f = −3.42
(R3 + R4) / (R3-R4) = − 0.86
ν3 = 23
L / 2Y = 1.11
FIG. 9 is a sectional view of the imaging lens of Example 5. In the figure, GF is the front group, GR is the rear group, L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, S is the aperture stop, I is An imaging surface is shown. F is a parallel plate that assumes an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, and the like. FIG. 10 is an aberration diagram (spherical aberration, astigmatism, distortion) of the imaging lens of Example 5.
(Example 6)
The overall specifications are shown below.
ｆ＝５．２３ｍｍ
ｆＢ＝０．４７ｍｍ
Ｆ＝２．０
２Ｙ＝７．０ｍｍ
ＥＮＴＰ＝１．１６ｍｍ
ＥＸＴＰ＝−３．５２ｍｍ
Ｈ１＝−０．４６ｍｍ
Ｈ２＝−４．７６ｍｍ
面データを以下に示す。
面番号 Ｒ(mm) Ｄ(mm) Ｎｄ νｄ 有効半径(mm)
１＊ -6.569 0.50 1.6320 23 2.06
２＊ -9.999 0.10 1.85
３＊ 2.788 1.11 1.5447 56 1.62
４＊ -13.533 0.01 1.39
５（絞り） ∞ 1.07 1.24
６＊ -2.971 0.50 1.6320 23 1.38
７＊ -11.651 0.27 1.65
８＊ 19.364 1.69 1.5447 56 1.87
９＊ -1.656 0.47 2.14
10＊ -14.443 0.69 1.5305 56 2.37
11＊ 1.738 0.80 3.07
12 ∞ 0.15 1.5163 64 3.29
13 ∞ 3.32
なお、全てのレンズはプラスチック材料から形成されている。
f = 5.23mm
fB = 0.47mm
F = 2.0
2Y = 7.0mm
ENTP = 1.16mm
EXTP = -3.52mm
H1 = −0.46mm
H2 = -4.76mm
The surface data is shown below.
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * -6.569 0.50 1.6320 23 2.06
2 * -9.999 0.10 1.85
3 * 2.788 1.11 1.5447 56 1.62
4 * -13.533 0.01 1.39
5 (Aperture) ∞ 1.07 1.24
6 * -2.971 0.50 1.6320 23 1.38
7 * -11.651 0.27 1.65
8 * 19.364 1.69 1.5447 56 1.87
9 * -1.656 0.47 2.14
10 * -14.443 0.69 1.5305 56 2.37
11 * 1.738 0.80 3.07
12 ∞ 0.15 1.5163 64 3.29
13 ∞ 3.32
All the lenses are made of a plastic material.
非球面係数を以下に示す。
第１面
K=0.11986E+00,A4=0.62640E-02,A6=-0.33445E-03,A8=0.22440E-03,A10=-0.27940E-04
第２面
K=-0.25060E+02,A4=0.35837E-02,A6=0.15339E-02,A8=-0.67854E-04,A10=0.49512E-04
第３面
K=-0.33966E+00,A4=-0.76910E-03,A6=0.99873E-04,A8=0.23948E-03,A10=-0.59334E-04
第４面
K=0.19334E+02,A4=-0.66951E-02,A6=-0.76022E-03,A8=0.21538E-03
第６面
K=0.14750E+01,A4=-0.25539E-02,A6=0.38182E-02,A8=0.79003E-03
第７面
K=0.22515E+00,A4=-0.68390E-02,A6=0.34864E-02,A8=0.82698E-03,A10=-0.53246E-04
第８面
K=-0.30000E+02,A4=-0.12255E-01,A6=-0.19875E-02,A8=-0.14183E-03,A10=0.17788E-03
第９面
K=-0.38675E+01,A4=-0.25298E-01,A6=0.22956E-02,A8=-0.27654E-03,
A10=-0.89154E-04,A12=0.19818E-04
第１０面
K=0.29634E+02,A4=-0.33735E-01,A6=0.24041E-02,A8=0.40277E-03,A10=-0.60281E-04,
A12=0.22635E-05
第１１面
K=-0.60191E+01,A4=-0.21593E-01,A6=0.34086E-02,A8=-0.37218E-03,A10=0.18327E-04,
A12=-0.30779E-06
単レンズデータを以下に示す。
レンズ 始面 焦点距離(mm)
１ 1 -32.11
２ 3 4.35
３ 6 -6.46
４ 8 2.88
５ 10 -2.88
各条件式に対応する値を以下に示す。
The aspheric coefficient is shown below.
First side
K = 0.11986E + 00, A4 = 0.62640E-02, A6 = -0.33445E-03, A8 = 0.22440E-03, A10 = -0.27940E-04
Second side
K = -0.25060E + 02, A4 = 0.35837E-02, A6 = 0.15339E-02, A8 = -0.67854E-04, A10 = 0.49512E-04
Third side
K = -0.33966E + 00, A4 = -0.76910E-03, A6 = 0.99873E-04, A8 = 0.23948E-03, A10 = -0.59334E-04
4th page
K = 0.19334E + 02, A4 = -0.66951E-02, A6 = -0.76022E-03, A8 = 0.21538E-03
6th page
K = 0.14750E + 01, A4 = -0.25539E-02, A6 = 0.38182E-02, A8 = 0.79003E-03
7th page
K = 0.22515E + 00, A4 = -0.68390E-02, A6 = 0.34864E-02, A8 = 0.82698E-03, A10 = -0.53246E-04
8th page
K = -0.30000E + 02, A4 = -0.12255E-01, A6 = -0.19875E-02, A8 = -0.14183E-03, A10 = 0.17788E-03
9th page
K = -0.38675E + 01, A4 = -0.25298E-01, A6 = 0.22956E-02, A8 = -0.27654E-03,
A10 = -0.89154E-04, A12 = 0.19818E-04
10th page
K = 0.29634E + 02, A4 = -0.33735E-01, A6 = 0.24041E-02, A8 = 0.40277E-03, A10 = -0.60281E-04,
A12 = 0.22635E-05
11th page
K = -0.60191E + 01, A4 = -0.21593E-01, A6 = 0.34086E-02, A8 = -0.37218E-03, A10 = 0.18327E-04,
A12 = -0.30779E-06
Single lens data is shown below.
Lens Start surface Focal length (mm)
1 1 -32.11
2 3 4.35
3 6 -6.46
4 8 2.88
5 10 -2.88
The values corresponding to each conditional expression are shown below.
ｆＲ／ｆ＝−３．１４
（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＝−０．６６
ν３＝２３
Ｌ／２Ｙ＝１．１１
図１１は実施例６の撮像レンズの断面図である。図中、ＧＦは前群、ＧＲは後群、Ｌ１は第１レンズ、Ｌ２は第２レンズ、Ｌ３は第３レンズ、Ｌ４は第４レンズ、Ｌ５は第５レンズ、Ｓは開口絞り、Ｉは撮像面を示す。また、Ｆは光学的ローパスフィルタやＩＲカットフィルタ、固体撮像素子のシールガラス等を想定した平行平板である。図１２は実施例６の撮像レンズの収差図（球面収差、非点収差、歪曲収差）である。
（実施例７）
全体諸元を以下に示す。
fR / f = -3.14
(R3 + R4) / (R3-R4) = − 0.66
ν3 = 23
L / 2Y = 1.11
FIG. 11 is a sectional view of the imaging lens of Example 6. In the figure, GF is the front group, GR is the rear group, L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, S is the aperture stop, I is An imaging surface is shown. F is a parallel plate that assumes an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, and the like. FIG. 12 is an aberration diagram (spherical aberration, astigmatism, distortion) of the imaging lens of Example 6.
(Example 7)
The overall specifications are shown below.
ｆ＝５．４４ｍｍ
ｆＢ＝０．３２ｍｍ
Ｆ＝２．０
２Ｙ＝７．０ｍｍ
ＥＮＴＰ＝１．２０ｍｍ
ＥＸＴＰ＝−３．１４ｍｍ
Ｈ１＝−１．９１ｍｍ
Ｈ２＝−５．１２ｍｍ
面データを以下に示す。
面番号 Ｒ(mm) Ｄ(mm) Ｎｄ νｄ 有効半径(mm)
１＊ 17.867 0.45 1.6320 23 2.01
２＊ 7.227 0.05 1.77
３＊ 2.550 1.17 1.5447 56 1.62
４＊ -14.482 0.00 1.36
５（絞り） ∞ 0.98 1.25
６＊ -4.171 0.45 1.5830 30 1.39
７＊ 20.259 0.19 1.66
８＊ 5.387 1.93 1.5305 56 1.94
９＊ -1.755 0.58 2.19
10＊ -4.499 0.45 1.5305 56 2.26
11＊ 1.909 0.80 3.01
12 ∞ 0.15 1.5163 64 3.29
13 ∞ 3.33
なお、全てのレンズはプラスチック材料から形成されている。
f = 5.44mm
fB = 0.32mm
F = 2.0
2Y = 7.0mm
ENTP = 1.20mm
EXTP = -3.14mm
H1 = -1.91mm
H2 = -5.12mm
The surface data is shown below.
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * 17.867 0.45 1.6320 23 2.01
2 * 7.227 0.05 1.77
3 * 2.550 1.17 1.5447 56 1.62
4 * -14.482 0.00 1.36
5 (Aperture) ∞ 0.98 1.25
6 * -4.171 0.45 1.5830 30 1.39
7 * 20.259 0.19 1.66
8 * 5.387 1.93 1.5305 56 1.94
9 * -1.755 0.58 2.19
10 * -4.499 0.45 1.5305 56 2.26
11 * 1.909 0.80 3.01
12 ∞ 0.15 1.5163 64 3.29
13 ∞ 3.33
All the lenses are made of a plastic material.
非球面係数を以下に示す。
第１面
K=-0.30000E+02,A4=-0.28810E-02,A6=-0.45850E-03,A8=0.29999E-04,A10=0.23545E-04,
A12=0.13471E-05
第２面
K=0.13290E+02,A4=-0.86213E-02,A6=-0.44729E-03,A8=-0.16068E-03,A10=0.54063E-04
第３面
K=-0.26097E+00,A4=-0.20753E-02,A6=-0.28172E-03,A8=0.31024E-03,A10=-0.16683E-03
第４面
K=0.11649E+02,A4=-0.20322E-02,A6=-0.46770E-03,A8=-0.62843E-03
第６面
K=0.56380E+01,A4=-0.46641E-02,A6=0.15207E-02,A8=0.11166E-02
第７面
K=-0.30000E+02,A4=-0.23602E-01,A6=0.52180E-02,A8=0.21462E-02,A10=-0.40954E-03
第８面
K=-0.15217E+02,A4=-0.14108E-01,A6=-0.25871E-03,A8=0.66414E-03,A10=-0.50356E-04
第９面
K=-0.44938E+01,A4=-0.24379E-01,A6=0.23374E-02,A8=-0.35670E-03,
A10=-0.26460E-04,A12=0.76911E-05
第１０面
K=0.22613E+01,A4=-0.40262E-01,A6=0.57440E-02,A8=0.32103E-03,A10=-0.19798E-03,
A12=0.22924E-04
第１１面
K=-0.84714E+01,A4=-0.24689E-01,A6=0.49200E-02,A8=-0.58054E-03,A10=0.32252E-04,
A12=-0.63776E-06
単レンズデータを以下に示す。
レンズ 始面 焦点距離(mm)
１ 1 -19.52
２ 3 4.08
３ 6 -5.89
４ 8 2.75
５ 10 -2.47
各条件式に対応する値を以下に示す。
The aspheric coefficient is shown below.
First side
K = -0.30000E + 02, A4 = -0.28810E-02, A6 = -0.45850E-03, A8 = 0.29999E-04, A10 = 0.23545E-04,
A12 = 0.13471E-05
Second side
K = 0.13290E + 02, A4 = -0.86213E-02, A6 = -0.44729E-03, A8 = -0.16068E-03, A10 = 0.54063E-04
Third side
K = -0.26097E + 00, A4 = -0.20753E-02, A6 = -0.28172E-03, A8 = 0.31024E-03, A10 = -0.16683E-03
4th page
K = 0.11649E + 02, A4 = -0.20322E-02, A6 = -0.46770E-03, A8 = -0.62843E-03
6th page
K = 0.56380E + 01, A4 = -0.46641E-02, A6 = 0.15207E-02, A8 = 0.11166E-02
7th page
K = -0.30000E + 02, A4 = -0.23602E-01, A6 = 0.52180E-02, A8 = 0.21462E-02, A10 = -0.40954E-03
8th page
K = -0.15217E + 02, A4 = -0.14108E-01, A6 = -0.25871E-03, A8 = 0.66414E-03, A10 = -0.50356E-04
9th page
K = -0.44938E + 01, A4 = -0.24379E-01, A6 = 0.23374E-02, A8 = -0.35670E-03,
A10 = -0.26460E-04, A12 = 0.76911E-05
10th page
K = 0.22613E + 01, A4 = -0.40262E-01, A6 = 0.57440E-02, A8 = 0.32103E-03, A10 = -0.19798E-03,
A12 = 0.22924E-04
11th page
K = -0.84714E + 01, A4 = -0.24689E-01, A6 = 0.49200E-02, A8 = -0.58054E-03, A10 = 0.32252E-04,
A12 = -0.63776E-06
Single lens data is shown below.
Lens Start surface Focal length (mm)
1 1 -19.52
2 3 4.08
3 6 -5.89
4 8 2.75
5 10 -2.47
The values corresponding to each conditional expression are shown below.
ｆＲ／ｆ＝−１．９９
（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＝−０．７０
ν３＝３０
Ｌ／２Ｙ＝１．０７
図１３は実施例７の撮像レンズの断面図である。図中、ＧＦは前群、ＧＲは後群、Ｌ１は第１レンズ、Ｌ２は第２レンズ、Ｌ３は第３レンズ、Ｌ４は第４レンズ、Ｌ５は第５レンズ、Ｓは開口絞り、Ｉは撮像面を示す。また、Ｆは光学的ローパスフィルタやＩＲカットフィルタ、固体撮像素子のシールガラス等を想定した平行平板である。図１４は実施例７の撮像レンズの収差図（球面収差、非点収差、歪曲収差）である。
（実施例８）
全体諸元を以下に示す。
fR / f = -1.99
(R3 + R4) / (R3-R4) = − 0.70
ν3 = 30
L / 2Y = 1.07
FIG. 13 is a cross-sectional view of the imaging lens of the seventh embodiment. In the figure, GF is the front group, GR is the rear group, L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, S is the aperture stop, I is An imaging surface is shown. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 14 is an aberration diagram (spherical aberration, astigmatism, distortion) of the imaging lens of Example 7.
(Example 8)
The overall specifications are shown below.
ｆ＝５．８５ｍｍ
ｆＢ＝０．８９ｍｍ
Ｆ＝２．０
２Ｙ＝７．０ｍｍ
ＥＮＴＰ＝１．４３ｍｍ
ＥＸＴＰ＝−４．３０ｍｍ
Ｈ１＝０．６９ｍｍ
Ｈ２＝−４．９６ｍｍ
面データを以下に示す。
面番号 Ｒ(mm) Ｄ(mm) Ｎｄ νｄ 有効半径(mm)
１＊ -271.236 0.57 1.5830 30 2.07
２＊ 8.445 0.05 1.78
３＊ 2.582 1.32 1.5447 56 1.69
４＊ -9.697 0.05 1.45
５（絞り） ∞ 1.36 1.35
６＊ -2.382 0.50 1.6320 23 1.40
７＊ -4.833 0.18 1.75
８＊ -4.208 1.40 1.5447 56 1.82
９＊ -1.307 0.29 2.10
10＊ 8.479 0.76 1.5305 56 2.62
11＊ 1.456 1.00 3.09
12 ∞ 0.15 1.5163 64 3.26
13 ∞ 3.28
なお、全てのレンズはプラスチック材料から形成されている。
f = 5.85mm
fB = 0.89mm
F = 2.0
2Y = 7.0mm
ENTP = 1.43mm
EXTP = -4.30mm
H1 = 0.69mm
H2 = -4.96mm
The surface data is shown below.
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * -271.236 0.57 1.5830 30 2.07
2 * 8.445 0.05 1.78
3 * 2.582 1.32 1.5447 56 1.69
4 * -9.697 0.05 1.45
5 (Aperture) ∞ 1.36 1.35
6 * -2.382 0.50 1.6320 23 1.40
7 * -4.833 0.18 1.75
8 * -4.208 1.40 1.5447 56 1.82
9 * -1.307 0.29 2.10
10 * 8.479 0.76 1.5305 56 2.62
11 * 1.456 1.00 3.09
12 ∞ 0.15 1.5163 64 3.26
13 ∞ 3.28
All the lenses are made of a plastic material.
非球面係数を以下に示す。
第１面
K=-0.30000E+02
第２面
K=0.16041E+02,A4=-0.25794E-03,A6=0.77360E-03,A8=0.22255E-03,A10=-0.28741E-04
第３面
K=-0.97974E-01,A4=-0.17455E-02,A6=0.13739E-02,A8=-0.97528E-04,A10=0.16632E-04
第４面
K=0.23269E+02,A4=0.47123E-03,A6=-0.98322E-03,A8=0.56277E-03
第６面
K=0.10184E+01,A4=-0.95652E-02,A6=-0.36091E-02,A8=0.12371E-02
第７面
K=0.43606E+01
第８面
K=0.87418E+00
第９面
K=-0.29528E+01,A4=-0.29875E-01,A6=0.31243E-02,A8=0.79818E-04,A10=-0.10655E-03, A12=0.24252E-04
第１０面
K=0.16621E+01,A4=-0.18259E-01,A6=0.11107E-02,A8=0.19527E-03,A10=-0.58802E-04,
A12=0.37476E-05
第１１面
K=-0.54766E+01,A4=-0.15117E-01,A6=0.18947E-02,A8=-0.19629E-03,A10=0.62020E-05,
A12=0.11902E-07
単レンズデータを以下に示す。
レンズ 始面 焦点距離(mm)
１ 1 -14.04
２ 3 3.89
３ 6 -8.07
４ 8 2.97
５ 10 -3.44
各条件式に対応する値を以下に示す。
The aspheric coefficient is shown below.
First side
K = -0.30000E + 02
Second side
K = 0.16041E + 02, A4 = -0.25794E-03, A6 = 0.77360E-03, A8 = 0.22255E-03, A10 = -0.28741E-04
Third side
K = -0.97974E-01, A4 = -0.17455E-02, A6 = 0.13739E-02, A8 = -0.97528E-04, A10 = 0.16632E-04
4th page
K = 0.23269E + 02, A4 = 0.47123E-03, A6 = -0.98322E-03, A8 = 0.56277E-03
6th page
K = 0.10184E + 01, A4 = -0.95652E-02, A6 = -0.36091E-02, A8 = 0.12371E-02
7th page
K = 0.43606E + 01
8th page
K = 0.87418E + 00
9th page
K = -0.29528E + 01, A4 = -0.29875E-01, A6 = 0.31243E-02, A8 = 0.79818E-04, A10 = -0.10655E-03, A12 = 0.24252E-04
10th page
K = 0.16621E + 01, A4 = -0.18259E-01, A6 = 0.11107E-02, A8 = 0.19527E-03, A10 = -0.58802E-04,
A12 = 0.37476E-05
11th page
K = -0.54766E + 01, A4 = -0.15117E-01, A6 = 0.18947E-02, A8 = -0.19629E-03, A10 = 0.62020E-05,
A12 = 0.11902E-07
Single lens data is shown below.
Lens Start surface Focal length (mm)
1 1 -14.04
2 3 3.89
3 6 -8.07
4 8 2.97
5 10 -3.44
The values corresponding to each conditional expression are shown below.
ｆＲ／ｆ＝−８．９８
（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＝−０．５８
ν３＝２３
Ｌ／２Ｙ＝１．２１
図１５は実施例８の撮像レンズの断面図である。図中、ＧＦは前群、ＧＲは後群、Ｌ１は第１レンズ、Ｌ２は第２レンズ、Ｌ３は第３レンズ、Ｌ４は第４レンズ、Ｌ５は第５レンズ、Ｓは開口絞り、Ｉは撮像面を示す。また、Ｆは光学的ローパスフィルタやＩＲカットフィルタ、固体撮像素子のシールガラス等を想定した平行平板である。図１６は実施例８の撮像レンズの収差図（球面収差、非点収差、歪曲収差）である。
（実施例９）
全体諸元を以下に示す。
fR / f = −8.98
(R3 + R4) / (R3-R4) = − 0.58
ν3 = 23
L / 2Y = 1.21
FIG. 15 is a cross-sectional view of the imaging lens of the eighth embodiment. In the figure, GF is the front group, GR is the rear group, L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, S is the aperture stop, I is An imaging surface is shown. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 16 is an aberration diagram (spherical aberration, astigmatism, distortion) of the imaging lens of Example 8.
Example 9
The overall specifications are shown below.
ｆ＝５．４３ｍｍ
ｆＢ＝０．３４ｍｍ
Ｆ＝２．０
２Ｙ＝７．０ｍｍ
ＥＮＴＰ＝１．２４ｍｍ
ＥＸＴＰ＝−３．４４ｍｍ
Ｈ１＝−１．１３ｍｍ
Ｈ２＝−５．０９ｍｍ
面データを以下に示す。
面番号 Ｒ(mm) Ｄ(mm) Ｎｄ νｄ 有効半径(mm)
１＊ -4.829 0.50 1.6320 23 2.24
２＊ -6.250 0.05 2.01
３＊ 2.589 1.15 1.5891 61 1.69
４＊ 63.591 0.09 1.39
５（絞り） ∞ 1.05 1.25
６＊ -2.250 0.45 1.6320 23 1.38
７＊ -4.290 0.05 1.62
８＊ 11.847 1.79 1.5305 56 1.86
９＊ -2.112 0.70 2.12
10＊ -2.983 0.50 1.5305 56 2.22
11＊ 4.455 0.80 2.88
12 ∞ 0.15 1.5163 64 3.31
13 ∞ 3.35
なお、第１レンズ、第３レンズ、第４レンズ、及び第５レンズはプラスチック材料から形成され、第２レンズはガラス材料から形成されている。
f = 5.43mm
fB = 0.34mm
F = 2.0
2Y = 7.0mm
ENTP = 1.24mm
EXTP = -3.44mm
H1 = −1.13mm
H2 = −5.09mm
The surface data is shown below.
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * -4.829 0.50 1.6320 23 2.24
2 * -6.250 0.05 2.01
3 * 2.589 1.15 1.5891 61 1.69
4 * 63.591 0.09 1.39
5 (Aperture) ∞ 1.05 1.25
6 * -2.250 0.45 1.6320 23 1.38
7 * -4.290 0.05 1.62
8 * 11.847 1.79 1.5305 56 1.86
9 * -2.112 0.70 2.12
10 * -2.983 0.50 1.5305 56 2.22
11 * 4.455 0.80 2.88
12 ∞ 0.15 1.5163 64 3.31
13 ∞ 3.35
The first lens, the third lens, the fourth lens, and the fifth lens are made of a plastic material, and the second lens is made of a glass material.
非球面係数を以下に示す。
第１面
K=-0.11076E+02,A4=0.11643E-02,A6=-0.64773E-04,A8=0.23256E-03,A10=-0.20578E-04
第２面
K=-0.21742E+02,A4=0.44960E-03,A6=0.12747E-02,A8=-0.15279E-04,A10=0.31372E-04
第３面
K=-0.16738E+00,A4=-0.23191E-02,A6=0.38229E-04,A8=0.49925E-04,A10=-0.85356E-05
第４面
K=-0.30000E+02,A4=-0.52536E-02,A6=-0.14603E-02,A8=0.24334E-03
第６面
K=0.73418E+00,A4=0.46666E-01,A6=-0.24465E-02,A8=0.15104E-02
第７面
K=-0.16225E+02,A4=0.10381E-01,A6=0.65653E-02,A8=0.10057E-02,A10=-0.42515E-03
第８面
K=-0.25291E+02,A4=-0.88590E-02,A6=0.33194E-03,A8=0.10049E-02,A10=-0.14210E-03
第９面
K=-0.45164E+01,A4=-0.31731E-01,A6=0.48904E-02,A8=-0.10048E-02,A10=0.58388E-04,
A12=0.64284E-05
第１０面
K=0.22314E+00,A4=-0.18194E-01,A6=0.14666E-02,A8=0.35449E-03,A10=-0.12423E-03,
A12=0.18039E-04
第１１面
K=-0.21120E+02,A4=-0.19672E-01,A6=0.30018E-02,A8=-0.36144E-03,A10=0.17066E-04,
A12=0.26735E-07
単レンズデータを以下に示す。
レンズ 始面 焦点距離(mm)
１ 1 -38.88
２ 3 4.55
３ 6 -8.18
４ 8 3.54
５ 10 -3.29
各条件式に対応する値を以下に示す。
The aspheric coefficient is shown below.
First side
K = -0.11076E + 02, A4 = 0.11643E-02, A6 = -0.64773E-04, A8 = 0.23256E-03, A10 = -0.20578E-04
Second side
K = -0.21742E + 02, A4 = 0.44960E-03, A6 = 0.12747E-02, A8 = -0.15279E-04, A10 = 0.31372E-04
Third side
K = -0.16738E + 00, A4 = -0.23191E-02, A6 = 0.38229E-04, A8 = 0.49925E-04, A10 = -0.85356E-05
4th page
K = -0.30000E + 02, A4 = -0.52536E-02, A6 = -0.14603E-02, A8 = 0.24334E-03
6th page
K = 0.73418E + 00, A4 = 0.46666E-01, A6 = -0.24465E-02, A8 = 0.15104E-02
7th page
K = -0.16225E + 02, A4 = 0.10381E-01, A6 = 0.65653E-02, A8 = 0.10057E-02, A10 = -0.42515E-03
8th page
K = -0.25291E + 02, A4 = -0.88590E-02, A6 = 0.33194E-03, A8 = 0.10049E-02, A10 = -0.14210E-03
9th page
K = -0.45164E + 01, A4 = -0.31731E-01, A6 = 0.48904E-02, A8 = -0.10048E-02, A10 = 0.58388E-04,
A12 = 0.64284E-05
10th page
K = 0.22314E + 00, A4 = -0.18194E-01, A6 = 0.14666E-02, A8 = 0.35449E-03, A10 = -0.12423E-03,
A12 = 0.18039E-04
11th page
K = -0.21120E + 02, A4 = -0.19672E-01, A6 = 0.30018E-02, A8 = -0.36144E-03, A10 = 0.17066E-04,
A12 = 0.26735E-07
Single lens data is shown below.
Lens Start surface Focal length (mm)
1 1 -38.88
2 3 4.55
3 6 -8.18
4 8 3.54
5 10 -3.29
The values corresponding to each conditional expression are shown below.
ｆＲ／ｆ＝−２．２９
（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＝−１．０８
ν３＝２３
Ｌ／２Ｙ＝１．０８
図１７は実施例９の撮像レンズの断面図である。図中、ＧＦは前群、ＧＲは後群、Ｌ１は第１レンズ、Ｌ２は第２レンズ、Ｌ３は第３レンズ、Ｌ４は第４レンズ、Ｌ５は第５レンズ、Ｓは開口絞り、Ｉは撮像面を示す。また、Ｆは光学的ローパスフィルタやＩＲカットフィルタ、固体撮像素子のシールガラス等を想定した平行平板である。図１８は実施例９の撮像レンズの収差図（球面収差、非点収差、歪曲収差）である。
（実施例１０）
全体諸元を以下に示す。
fR / f = −2.29
(R3 + R4) / (R3-R4) = − 1.08
ν3 = 23
L / 2Y = 1.08
FIG. 17 is a cross-sectional view of the imaging lens of Example 9. In the figure, GF is the front group, GR is the rear group, L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, S is the aperture stop, I is An imaging surface is shown. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 18 is an aberration diagram (spherical aberration, astigmatism, distortion) of the imaging lens of Example 9.
(Example 10)
The overall specifications are shown below.
ｆ＝５．４３ｍｍ
ｆＢ＝０．３５ｍｍ
Ｆ＝２．０
２Ｙ＝７．０ｍｍ
ＥＮＴＰ＝１．２５ｍｍ
ＥＸＴＰ＝−３．６７ｍｍ
Ｈ１＝−０．６４ｍｍ
Ｈ２＝−５．０８ｍｍ
面データを以下に示す。
面番号 Ｒ(mm) Ｄ(mm) Ｎｄ νｄ 有効半径(mm)
１＊ -16.757 0.50 1.6320 23 2.16
２＊ -24.886 0.05 1.94
３＊ 3.072 1.09 1.6935 53 1.68
４＊ 18.012 0.13 1.35
５（絞り） ∞ 0.88 1.20
６＊ -2.222 0.50 1.6320 23 1.33
７＊ -5.179 0.06 1.65
８＊ 8.677 2.10 1.5447 56 1.95
９＊ -2.050 0.90 2.24
10＊ -4.476 0.50 1.5305 56 2.37
11＊ 3.374 0.80 2.99
12 ∞ 0.15 1.5163 64 3.30
13 ∞ 3.34
なお、第１レンズ、第３レンズ、第４レンズ、及び第５レンズはプラスチック材料から形成され、第２レンズはガラス材料から形成されている。
f = 5.43mm
fB = 0.35mm
F = 2.0
2Y = 7.0mm
ENTP = 1.25mm
EXTP = -3.67mm
H1 = −0.64mm
H2 = −5.08mm
The surface data is shown below.
Surface number R (mm) D (mm) Nd νd Effective radius (mm)
1 * -16.757 0.50 1.6320 23 2.16
2 * -24.886 0.05 1.94
3 * 3.072 1.09 1.6935 53 1.68
4 * 18.012 0.13 1.35
5 (Aperture) ∞ 0.88 1.20
6 * -2.222 0.50 1.6320 23 1.33
7 * -5.179 0.06 1.65
8 * 8.677 2.10 1.5447 56 1.95
9 * -2.050 0.90 2.24
10 * -4.476 0.50 1.5305 56 2.37
11 * 3.374 0.80 2.99
12 ∞ 0.15 1.5163 64 3.30
13 ∞ 3.34
The first lens, the third lens, the fourth lens, and the fifth lens are made of a plastic material, and the second lens is made of a glass material.
非球面係数を以下に示す。
第１面
K=-0.30000E+02,A4=0.53809E-03,A6=-0.26388E-03,A8=0.24056E-03,A10=-0.18206E-04
第２面
K=-0.30000E+02,A4=0.20833E-03,A6=0.12177E-02,A8=-0.10064E-03,A10=0.55035E-04
第３面
K=0.33706E-01,A4=-0.73294E-03,A6=0.26347E-03,A8=0.13289E-03,A10=-0.38927E-04
第４面
K=-0.10776E+02,A4=-0.31711E-02,A6=-0.20131E-02,A8=0.19016E-04
第６面
K=0.82395E+00,A4=0.44104E-01,A6=-0.41231E-02,A8=0.15883E-02
第７面
K=-0.24732E+02,A4=0.93014E-02,A6=0.47740E-02,A8=0.57408E-03,A10=-0.34416E-03
第８面
K=-0.30000E+02,A4=-0.60778E-02,A6=0.39277E-04,A8=0.69070E-03,A10=-0.91943E-04
第９面
K=-0.41979E+01,A4=-0.31966E-01,A6=0.52741E-02,A8=-0.94238E-03,A10=0.42529E-04,
A12=0.57482E-05
第１０面
K=0.11792E+01,A4=-0.22626E-01,A6=0.10334E-02,A8=0.57284E-03,A10=-0.92824E-04,
A12=0.53114E-05
第１１面
K=-0.97445E+01,A4=-0.21153E-01,A6=0.32165E-02,A8=-0.34458E-03,A10=0.19198E-04,
A12=-0.40183E-06
単レンズデータを以下に示す。
レンズ 始面 焦点距離(mm)
１ 1 -83.15
２ 3 5.19
３ 6 -6.56
４ 8 3.27
５ 10 -3.55
各条件式に対応する値を以下に示す。
The aspheric coefficient is shown below.
First side
K = -0.30000E + 02, A4 = 0.53809E-03, A6 = -0.26388E-03, A8 = 0.24056E-03, A10 = -0.18206E-04
Second side
K = -0.30000E + 02, A4 = 0.20833E-03, A6 = 0.12177E-02, A8 = -0.10064E-03, A10 = 0.55035E-04
Third side
K = 0.33706E-01, A4 = -0.73294E-03, A6 = 0.26347E-03, A8 = 0.13289E-03, A10 = -0.38927E-04
4th page
K = -0.10776E + 02, A4 = -0.31711E-02, A6 = -0.20131E-02, A8 = 0.19016E-04
6th page
K = 0.82395E + 00, A4 = 0.44104E-01, A6 = -0.41231E-02, A8 = 0.15883E-02
7th page
K = -0.24732E + 02, A4 = 0.93014E-02, A6 = 0.47740E-02, A8 = 0.57408E-03, A10 = -0.34416E-03
8th page
K = -0.30000E + 02, A4 = -0.60778E-02, A6 = 0.39277E-04, A8 = 0.69070E-03, A10 = -0.91943E-04
9th page
K = -0.41979E + 01, A4 = -0.31966E-01, A6 = 0.52741E-02, A8 = -0.94238E-03, A10 = 0.42529E-04,
A12 = 0.57482E-05
10th page
K = 0.11792E + 01, A4 = -0.22626E-01, A6 = 0.10334E-02, A8 = 0.57284E-03, A10 = -0.92824E-04,
A12 = 0.53114E-05
11th page
K = -0.97445E + 01, A4 = -0.21153E-01, A6 = 0.32165E-02, A8 = -0.34458E-03, A10 = 0.19198E-04,
A12 = -0.40183E-06
Single lens data is shown below.
Lens Start surface Focal length (mm)
1 1 -83.15
2 3 5.19
3 6 -6.56
4 8 3.27
5 10 -3.55
The values corresponding to each conditional expression are shown below.
ｆＲ／ｆ＝−６．０１
（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＝−１．４１
ν３＝２３
Ｌ／２Ｙ＝１．１４
図１９は実施例１０の撮像レンズの断面図である。図中、ＧＦは前群、ＧＲは後群、Ｌ１は第１レンズ、Ｌ２は第２レンズ、Ｌ３は第３レンズ、Ｌ４は第４レンズ、Ｌ５は第５レンズ、Ｓは開口絞り、Ｉは撮像面を示す。また、Ｆは光学的ローパスフィルタやＩＲカットフィルタ、固体撮像素子のシールガラス等を想定した平行平板である。図２０は実施例１０の撮像レンズの収差図（球面収差、非点収差、歪曲収差）である。
fR / f = −6.01
(R3 + R4) / (R3-R4) = − 1.41
ν3 = 23
L / 2Y = 1.14
FIG. 19 is a cross-sectional view of the imaging lens of Example 10. In the figure, GF is the front group, GR is the rear group, L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, S is the aperture stop, I is An imaging surface is shown. Further, F is a parallel plate assuming an optical low-pass filter, an IR cut filter, a seal glass of a solid-state image sensor, or the like. FIG. 20 is an aberration diagram (spherical aberration, astigmatism, distortion) of the imaging lens of Example 10.
ここで、プラスチック材料は温度変化時の屈折率変化が大きいため、第１レンズから第５レンズの全てをプラスチックレンズで構成すると、周囲温度が変化した際に、撮像レンズ全系の像点位置が変動してしまうという問題を抱えてしまう。 Here, since the plastic material has a large refractive index change when the temperature changes, if all of the first lens to the fifth lens are made of plastic lenses, the image point position of the entire imaging lens system changes when the ambient temperature changes. I have the problem of fluctuating.
そこで最近では、プラスチック材料中に無機微粒子を混合させ、プラスチック材料の温度変化を小さくできることが分かってきた。詳細に説明すると、一般に透明なプラスチック材料に微粒子を混合させると、光の散乱が生じ透過率が低下するため、光学材料として使用することは困難であったが、微粒子の大きさを透過光束の波長より小さくすることにより、散乱が実質的に発生しないようにできる。プラスチック材料は温度が上昇することにより屈折率が低下してしまうが、無機粒子は温度が上昇すると屈折率が上昇する。そこで、これらの温度依存性を利用して互いに打ち消しあうように作用させることにより、屈折率変化がほとんど生じないようにすることができる。具体的には、母材となるプラスチック材料に最大長が２０ナノメートル以下の無機粒子を分散させることにより、屈折率の温度依存性の極めて低いプラスチック材料となる。例えば、アクリルに酸化ニオブ（Ｎｂ２Ｏ５）の微粒子を分散させることで、温度変化による屈折率変化を小さくすることができる。 Therefore, recently, it has been found that inorganic fine particles can be mixed in a plastic material to reduce the temperature change of the plastic material. More specifically, mixing fine particles with a transparent plastic material generally causes light scattering and lowers the transmittance, so it was difficult to use as an optical material. By making it smaller than the wavelength, it is possible to substantially prevent scattering. The refractive index of the plastic material decreases with increasing temperature, but the refractive index of inorganic particles increases with increasing temperature. Therefore, it is possible to make almost no change in the refractive index by using these temperature dependencies so as to cancel each other. Specifically, by dispersing inorganic particles having a maximum length of 20 nanometers or less in a plastic material as a base material, a plastic material with extremely low temperature dependency of the refractive index is obtained. For example, by dispersing fine particles of niobium oxide (Nb 2 O 5) in acrylic, the refractive index change due to temperature change can be reduced.
本発明において、比較的屈折力の大きな正レンズ（Ｌ２）、または全てのレンズ（Ｌ１〜Ｌ５）に、このような無機粒子を分散させたプラスチック材料を用いることにより、撮像レンズ全系の温度変化時の像点位置変動を小さく抑えることが可能となる。 In the present invention, by using a plastic material in which such inorganic particles are dispersed for the positive lens (L2) having a relatively large refractive power or all the lenses (L1 to L5), the temperature change of the entire imaging lens system is achieved. It is possible to suppress the image point position fluctuation at the time.
ＧＦ 前群
ＧＲ 後群
Ｌ１ 第１レンズ
Ｌ２ 第２レンズ
Ｌ３ 第３レンズ
Ｌ４ 第４レンズ
Ｌ５ 第５レンズ
Ｓ 開口絞り
Ｉ 撮像面
Ｆ 平行平板
GF Front group GR Rear group L1 1st lens L2 2nd lens L3 3rd lens L4 4th lens L5 5th lens S Aperture stop I Imaging surface F Parallel plate
Claims (5)
物体側より順に、正の屈折力を有する前群と、開口絞りと、負の屈折力を有する後群とからなり、
前記前群は、負の屈折力を有する第１レンズと、正の屈折力を有する第２レンズとからなり、
前記後群は、負の屈折力を有する第３レンズと、正の屈折力を有する第４レンズと、負の屈折力を有する第５レンズとからなり、
前記第５レンズの像側面は非球面からなり、中心では負の屈折力を有し、周辺に向かうに従い負の屈折力が弱くなるような変曲点を有することを特徴とする撮像レンズ。 An imaging lens for forming a subject image on a photoelectric conversion unit of a solid-state imaging device,
In order from the object side, it consists of a front group having positive refractive power, an aperture stop, and a rear group having negative refractive power,
The front group includes a first lens having a negative refractive power and a second lens having a positive refractive power,
The rear group includes a third lens having negative refractive power, a fourth lens having positive refractive power, and a fifth lens having negative refractive power,
The imaging lens according to claim 5, wherein the image side surface of the fifth lens is an aspheric surface, has a negative refractive power at the center, and has an inflection point at which the negative refractive power becomes weaker toward the periphery.
−４０．０＜ｆＲ／ｆ＜−０．５
但し、
ｆＲ：前記後群の合成焦点距離
ｆ：前記撮像レンズ全系の焦点距離 The imaging lens according to claim 1, wherein the rear group satisfies the following conditional expression.
-40.0 <fR / f <-0.5
However,
fR: Composite focal length of the rear group f: Focal length of the entire imaging lens system
−２．５＜（Ｒ３＋Ｒ４）／（Ｒ３−Ｒ４）＜−０．１
但し、
Ｒ３：第２レンズの物体側面の曲率半径
Ｒ４：第２レンズの像側面の曲率半径 The imaging lens according to claim 1, wherein the second lens satisfies the following conditional expression.
-2.5 <(R3 + R4) / (R3-R4) <-0.1
However,
R3: radius of curvature of object side surface of second lens R4: radius of curvature of image side surface of second lens
１０＜ν３＜３５
但し、
ν３：前記第３レンズのアッベ数 The imaging lens according to claim 1, wherein the following conditional expression is satisfied.
10 <ν3 <35
However,
ν3: Abbe number of the third lens
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