JP2005055600A - Image forming lens and portable electronic appliance - Google Patents

Image forming lens and portable electronic appliance Download PDF

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JP2005055600A
JP2005055600A JP2003285121A JP2003285121A JP2005055600A JP 2005055600 A JP2005055600 A JP 2005055600A JP 2003285121 A JP2003285121 A JP 2003285121A JP 2003285121 A JP2003285121 A JP 2003285121A JP 2005055600 A JP2005055600 A JP 2005055600A
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lens
conjugate side
imaging lens
imaging
small
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JP4515728B2 (en
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Yoshitsugu Kono
義次 河野
Takeo Arai
健雄 新井
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Ricoh Optical Industries Co Ltd
Sony Corp
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Ricoh Optical Industries Co Ltd
Sony Corp
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    • 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

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-performance small and lightweight triple-lens image forming lens which is bright with about 3.5 F number, which has the half angle of view as wide as ≥30°, about 0.08 mm astigmatism and about ±0.3% distortion aberration and which is suitably used for an imaging element having ≤5 μm pixel pitch. <P>SOLUTION: The lens includes, in the order from a larger conjugate side, first to third lenses L1 to L3. The first lens L1 is a positive lens the face of which in the larger conjugate side is a convex face toward the larger conjugate side, the second lens L2 is a negative meniscus lens having a convex face opposing to the smaller conjugate side, and the third lens L3 is a positive meniscus lens having a convex face opposing to the larger conjugate side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は「結像レンズ」および「携帯可能な電子機器」に関する。
この発明の携帯可能な電子機器は、デジタルカメラやノート型コンピュータ、携帯電話等として実施できる。 The present invention relates to an “imaging lens” and a “portable electronic device”.
The portable electronic device of the present invention can be implemented as a digital camera, a notebook computer, a mobile phone, or the like.

ＣＣＤやＣＭＯＳといった撮像素子が小型化され、ノート型コンピュータや携帯電話等の「携帯可能な電子機器」が撮影機能を持つことが一般化されている。近来、このような携帯可能な電子機器における撮像機能も、撮像素子の画素ピッチの微細化による高画素数化が進み、画質の向上が図られている。   An image pickup device such as a CCD or CMOS has been miniaturized, and it has become common for “portable electronic devices” such as notebook computers and mobile phones to have a photographing function. Recently, the imaging function of such portable electronic devices has also been improved by increasing the number of pixels by making the pixel pitch of the imaging device finer, and improving the image quality.

このような状況のもとで、携帯可能な電子機器に搭載される結像レンズも、高性能なものが求められ、従来の１枚構成のものから複数枚構成のものが提案されつつある（特許文献１〜４）。   Under such circumstances, an imaging lens mounted on a portable electronic device is required to have a high performance, and a lens having a plurality of lenses is being proposed instead of a conventional lens having a single lens ( Patent Documents 1 to 4).

特許文献１〜３に記載された結像レンズは、性能的には良好であるがレンズ構成枚数が４枚と多く、コンパクト性、コスト面で問題無しとしない。   The imaging lenses described in Patent Documents 1 to 3 are good in performance, but have a large number of four lenses, and there is no problem in terms of compactness and cost.

特許文献４記載の結像レンズは、２枚構成でありコンパクト性やコスト面で有利であるが、歪曲収差が２〜１０％もあり、性能的に必ずしも十分と言えない。   The imaging lens described in Patent Document 4 has a two-lens configuration and is advantageous in terms of compactness and cost, but has 2 to 10% distortion and is not necessarily sufficient in terms of performance.

特開２００２−３６５５２９JP 2002-365529

特開２００２−３６５５３０JP 2002-365530 特開２００２−３６５５３１JP-A-2002-365531 特開２００３−７５７１９JP 2003-75719 A

この発明は、Ｆナンバ：３．５程度と明るく、半画角：３０度以上と広画角で、非点収差：０．０８ｍｍ程度、歪曲収差：±０．３％程度で、画素ピッチ：５μｍ以下の撮像素子に好適に使用可能な、高性能で小型軽量な３枚構成の結像レンズの実現を課題とする。   The present invention is bright with an F number of about 3.5, a wide angle of view with a half field angle of 30 degrees or more, an astigmatism of about 0.08 mm, a distortion aberration of about ± 0.3%, and a pixel pitch: It is an object of the present invention to realize a high-performance, compact and lightweight three-lens imaging lens that can be suitably used for an image sensor of 5 μm or less.

この発明の結像レンズは、図１に例示するように、大きな共役側（図の左方）から順に、第１レンズＬ１、第２レンズＬ２、第３レンズＬ３を配してなる。
即ち、結像関係において物体距離・像距離のうち、大なるほうが「大きい共役側」、小なるほうが「小さい共役側」である。 As illustrated in FIG. 1, the imaging lens of the present invention includes a first lens L <b> 1, a second lens L <b> 2, and a third lens L <b> 3 in order from the large conjugate side (left side in the figure).
That is, in the imaging relationship, the larger one of the object distance and the image distance is the “large conjugate side”, and the smaller one is the “small conjugate side”.

第１レンズＬ１は、大きな共役側の面が凸面の正レンズ、第２レンズＬ２は、小さな共役側（図の右方）に凸面を向けた負のメニスカスレンズ、第３レンズＬ３は、大きな共役側に凸面を向けた正のメニスカスレンズである（請求項１）。   The first lens L1 is a positive lens having a convex surface on the large conjugate side, the second lens L2 is a negative meniscus lens having a convex surface facing the small conjugate side (right side in the figure), and the third lens L3 is a large conjugate. A positive meniscus lens having a convex surface directed to the side (Claim 1).

請求項１記載の結像レンズの、第３レンズＬ３の「小さな共役側の面（図の右側の面）」を非球面とし、この非球面の形状を図１に示す如く「光軸近傍においては小さな共役側に凹で、軸外において、小さな共役側に凸の形状」とすることが好ましい（請求項２）。   In the imaging lens according to claim 1, the “small conjugate side surface (the right side surface in the figure)” of the third lens L3 is an aspherical surface, and the shape of this aspherical surface is “near the optical axis” as shown in FIG. Is preferably concave on the small conjugate side and convex on the small conjugate side outside the axis.

請求項１または２記載の結像レンズは、第１レンズＬ１の大きな共役側の面から全系の後側主点位置までの光軸上の距離：ＤＨ、第１レンズＬ１の大きな共役側の面から第３レンズＬ３の小さな共役側の面までの光軸上の距離：ＯＡＬ（レンズ全長）が、条件：
（１） ０．２＜ＤＨ／ＯＡＬ＜０．４
を満足することが好ましい（請求項３）。 The imaging lens according to claim 1 or 2, the distance on the optical axis from the large conjugate side surface of the first lens L1 to the rear principal point position of the entire system: DH, on the large conjugate side of the first lens L1 Distance on the optical axis from the surface to the small conjugate side surface of the third lens L3: OAL (lens total length) is a condition:
(1) 0.2 <DH / OAL <0.4
Is preferably satisfied (Claim 3).

請求項１〜３の任意の１に記載の結像レンズは、第２レンズＬ２の材質のアッベ数：ν２が、条件：
（２） ν２＜４０
を満足することが好ましい（請求項４）。 The imaging lens according to any one of claims 1 to 3, wherein the Abbe number: ν2 of the material of the second lens L2 is:
(2) ν2 <40
Is preferably satisfied (claim 4).

請求項１〜４の任意の１に記載の結像レンズは、第１レンズＬ１の材質のアッベ数：ν１が、条件：
（３） ν１＞５５
を満足することが好ましい（請求項５）。 The imaging lens according to any one of claims 1 to 4, wherein the Abbe number: ν1 of the material of the first lens L1 is a condition:
(3) ν1> 55
Is preferably satisfied (Claim 5).

請求項１〜５の任意の１に記載の結像レンズは、第１レンズＬ１の、大きな共役側の面の曲率半径：Ｒ１、小さな共役側の面の曲率半径：Ｒ２が、条件：
（４） ０＜Ｒ１／｜Ｒ２｜＜０．３
を満足することが好ましい（請求項６）。 The imaging lens according to any one of claims 1 to 5, wherein the first lens L1 has a large radius of curvature on the conjugate side surface: R1 and a radius of curvature of the small conjugate side surface: R2 on the condition:
(4) 0 <R1 / | R2 | <0.3
Is preferably satisfied (claim 6).

請求項１〜６の任意の１に記載の結像レンズは、図１に示されたように、第１レンズＬ１の大きな共役側に「絞り」を有することが好ましい（請求項７）。   The imaging lens according to any one of claims 1 to 6 preferably has a “diaphragm” on the large conjugate side of the first lens L1, as shown in FIG. 1 (claim 7).

請求項１〜７の任意の１に記載の結像レンズは、第２レンズＬ２と第３レンズＬ３とをプラスチック材料で形成することが好ましい（請求項８）。   In the imaging lens according to any one of claims 1 to 7, it is preferable that the second lens L2 and the third lens L3 are formed of a plastic material (claim 8).

この発明の電子機器は、上記請求項１〜８の任意の１に記載の結像レンズを搭載した携帯可能な電子機器（請求項９）である。   The electronic device of the present invention is a portable electronic device (Claim 9) on which the imaging lens according to any one of Claims 1 to 8 is mounted.

従来から「実使用上、十分な画質を実現できる最小構成枚数のレンズ」として、３枚構成のトリプレット型が知られている。この発明の結像レンズは、トリプレット型レンズを発展させたものである。   Conventionally, a triplet type having three lenses is known as “the minimum number of lenses capable of realizing sufficient image quality in actual use”. The imaging lens of the present invention is a development of a triplet type lens.

従って、この発明の結像レンズもトリプレット型の屈折力配分である「正・負・正」の屈折力配分を有する。   Therefore, the imaging lens of the present invention also has a “positive / negative / positive” refractive power distribution which is a triplet-type refractive power distribution.

第１レンズＬ１の大きな共役側の面を「凸面」とすることにより、軸上・軸外の光束に対する適度な収束力を与え、第２レンズＬ２、第３レンズＬ３により補正することにより、全系として良好な収差補正を実現している。   By making the large conjugate side surface of the first lens L1 a “convex surface”, an appropriate converging force for on-axis and off-axis light beams is given and corrected by the second lens L2 and the third lens L3. As a system, good aberration correction is realized.

「典型的なトリプレット型レンズ」では、第２レンズの小さい共役側の面は凹面であり、このために軸外光線の「過剰な跳ね上げ」を生じやすいが、この発明の結像レンズでは、第２レンズＬ２において「小さな共役側の面を凸面とする」ことにより、上記軸外光束の過剰な跳ね上げを解消し、全系としての非点収差の幅を小さくすることを可能としている。   In the “typical triplet type lens”, the small conjugate side surface of the second lens is a concave surface, which tends to cause “excessive jumping” of off-axis rays. In the second lens L2, “the surface on the small conjugate side is a convex surface”, it is possible to eliminate excessive jumping of the off-axis light beam and to reduce the width of astigmatism as the entire system.

さらに、第３レンズＬ３を「大きな共役側に凸面を向けた正のメニスカスレンズ」とすることにより、軸上光線に対して入射角が小さくなるような状態、即ちコンセントリックな状態を作り出し、非球面化によっても困難な軸上光の収差の増大を抑えている。   Furthermore, by making the third lens L3 “a positive meniscus lens having a convex surface on the large conjugate side”, a state where the incident angle becomes small with respect to the axial ray, that is, a concentric state is created. The increase in the aberration of axial light, which is difficult even by the spheroidization, is suppressed.

請求項２記載の結像レンズでは、第３レンズＬ３の「小さな共役側の面」を非球面とし、この非球面の形状を「光軸近傍においては小さな共役側に凹で、軸外において、小さな共役側に凸の形状」としているが、光軸近傍では、上記の如くレンズ形状を「大きな共役側に凸面を向けた正のメニスカスレンズ」とすることにより上記の如く軸上光の収差を抑え、軸外では「小さな共役側に凸の形状」とすることにより、軸外光束の撮像素子への入射角が大きくなるのを防ぐことができる。   In the imaging lens according to claim 2, the “small conjugate side surface” of the third lens L3 is an aspherical surface, and the shape of the aspherical surface is “concave on the small conjugate side in the vicinity of the optical axis, and off-axis, `` Convex shape on the small conjugate side '', but in the vicinity of the optical axis, the lens shape is changed to `` a positive meniscus lens having a convex surface on the large conjugate side '' as described above, thereby reducing the aberration of axial light as described above. Suppressing and forming a “convex shape on the small conjugate side” off-axis can prevent the incident angle of the off-axis light beam from entering the image sensor.

周知の如く、カラー画像を撮像するためには、撮像素子の手前に３〜４種のカラーフィルタが用いられ、撮像素子への入射角が大きくなると、混色の原因となったり感度の低下を招来したりしやすいが、請求項２記載の結像レンズでは、上記の如く「軸外光束の撮像素子への入射角が大きくなるのを防ぐ」ことができるので、このような混色や感度低下の問題を有効に回避できる。   As is well known, in order to pick up a color image, three to four kinds of color filters are used in front of the image pickup device, and when the incident angle to the image pickup device is increased, color mixing may be caused or sensitivity may be lowered. However, the imaging lens according to claim 2 can prevent “increased incidence angle of off-axis light flux on the image pickup device” as described above. The problem can be effectively avoided.

条件（１）は、高い結像性能とコンパクト性を両立させやすくする条件であり、上限を超えると、後側主点が撮像素子に近くなり、レンズ全長としては長くなってコンパクト性が損なわれる。条件（１）の下限を超えると、後側主点が第１レンズの大きな共役側の面に寄り、レンズタイプとして「テレフォトタイプ」に近くなり「広画角化」が困難になる。   Condition (1) is a condition that makes it easy to achieve both high imaging performance and compactness. If the upper limit is exceeded, the rear principal point becomes close to the image sensor, and the total lens length becomes long and the compactness is impaired. . When the lower limit of the condition (1) is exceeded, the rear principal point approaches the large conjugate side surface of the first lens and becomes close to the “telephoto type” as the lens type, making “widening the angle of view” difficult.

また、条件（２）を満足することにより、軸上色収差・軸外色収差とも良好に補正することができる。   In addition, by satisfying the condition (2), both axial chromatic aberration and off-axis chromatic aberration can be corrected well.

第１レンズＬ１では近軸光線高が他のレンズにおけるよりも際立って高いので、第１レンズで大きな色収差が発生すると、他のレンズによる補正が困難であるが、条件（３）を満足することにより第１レンズにおける過剰な色収差の発生を回避できる。   Since the paraxial ray height of the first lens L1 is significantly higher than that of the other lenses, if a large chromatic aberration occurs in the first lens, correction by the other lenses is difficult, but the condition (3) is satisfied. Thus, it is possible to avoid the occurrence of excessive chromatic aberration in the first lens.

条件（４）は第１レンズＬ１において発生する球面収差を小さく抑える条件である。条件（４）の範囲内では、軸上光線の入射角が「大きな共役側もしくは小さな共役側で極端に大きくなる」ことが無く、この部分で発生する球面収差を他のレンズで補正するの容易である。   Condition (4) is a condition for suppressing the spherical aberration generated in the first lens L1. Within the range of condition (4), the incident angle of the axial beam does not “extremely increase on the large conjugate side or the small conjugate side”, and it is easy to correct the spherical aberration occurring in this portion with another lens. It is.

請求項７記載の結像レンズのように、第１レンズＬ１の大きな共役側に「絞り」を配することにより、短い全長で、広角でありながら、撮像素子への軸外光束の入射角が大きくなる」のを有効に回避できる。   By disposing the “aperture” on the large conjugate side of the first lens L1 as in the imaging lens according to claim 7, the incident angle of the off-axis light beam on the image sensor can be reduced while having a short overall length and a wide angle. It is possible to effectively avoid “becoming large”.

低分散材料が必要となる第１レンズＬ１以外の、第２レンズＬ２と第３レンズＬ３とをプラスチック材料で形成することにより（請求項８）、これらを成形で製造することにより結像レンズを低コストで実現できる。   By forming the second lens L2 and the third lens L3 other than the first lens L1, which requires a low dispersion material, from a plastic material (Claim 8), the imaging lens can be manufactured by manufacturing them by molding. Realized at low cost.

上記請求項１〜８の任意の１に記載の結像レンズを搭載することにより、携帯可能な電子機器（請求項９）を低コスト・コンパクトに実現でき、さらに撮像機能の高性能も実現できる。   By mounting the imaging lens according to any one of claims 1 to 8, a portable electronic device (claim 9) can be realized at a low cost and in a compact manner, and a high performance of an imaging function can also be realized. .

以下、この発明を実施するための最良の形態を、具体的な実施例により示す。   Hereinafter, the best mode for carrying out the present invention will be described by specific examples.

各実施例において、大きな共役側（被写体側）から数えて第ｉ番目の面（レンズ面及び絞りの面、撮像素子のカバーガラス（ＣＧと略記する）の面を含む。）の曲率半径（非球面にあっては近軸曲率半径）をＲｉ（ｉ＝１〜９）、第ｉ番目の面と第ｉ＋１番目の面の光軸上の面間隔をＤｉ（ｉ＝８）、大きな共役側から数えて第ｊ番目のレンズの材質の屈折率およびアッベ数をそれぞれ、Ｎｊ、νｊ（ｊ＝１〜３）で表す。   In each embodiment, the radius of curvature of the i-th surface (including the lens surface and the diaphragm surface, and the cover glass (abbreviated as CG) surface of the image sensor) counted from the large conjugate side (subject side) For a spherical surface, the paraxial radius of curvature (Ri) is Ri (i = 1 to 9), and the distance between the i-th surface and the (i + 1) -th surface on the optical axis is Di (i = 8). The refractive index and Abbe number of the material of the j-th lens are represented by Nj and νj (j = 1 to 3), respectively.

また、Ｄ０は「被写体から絞りに至る距離」、ＩＭＧは「撮像素子の撮像面」を表す。ｆは焦点距離、ＦＮｏ．はＦナンバ、ωは半画角を表す。
非球面については、Ｘを高軸方向の座標、ｈを光軸直交方向の座標、Ｒｉを近軸曲率半径、Ｋを円錐定数、Ａ、Ｂ、Ｃ、Ｄ・・を高次の非球面係数として、周知の非球面式：
Ｘ＝（ｈ2／Ｒｉ）／［１＋√{１−(Ｋ＋１)(ｈ/Ｒｉ)2}］
＋Ａ・ｈ4＋Ｂ・ｈ６＋Ｃ・ｈ８＋Ｄ・ｈ10＋・・
を用い、近軸曲率半径：Ｒｉ、円錐定数：Ｋ、高次の非球面係数：Ａ、Ｂ、Ｃ、Ｄ・・を与えて形状を特定する。 D0 represents “distance from the subject to the aperture”, and IMG represents “imaging surface of the image sensor”. f is the focal length, FNo. Represents an F number, and ω represents a half angle of view.
For aspheric surfaces, X is the coordinate in the high axis direction, h is the coordinate in the direction orthogonal to the optical axis, Ri is the paraxial radius of curvature, K is the conic constant, and A, B, C, D,. As well-known aspherical formula:
X = (h 2 / Ri) / [1 + √ {1- (K + 1) (h / Ri) 2 }]
+ A · h 4 + B · h 6 + C · h 8 + D · h 10 + ··
Is used to specify the shape by giving a paraxial radius of curvature: Ri, a conic constant: K, and higher-order aspherical coefficients: A, B, C, D,.

なお、計算波長は５４６ｎｍ（緑色）である。また、長さの次元を持つ量の単位はｍｍである。   The calculated wavelength is 546 nm (green). The unit of the quantity having the dimension of length is mm.

ｆ＝５．６９ｍｍ、ＦＮｏ．＝３．５０、ω＝３１．６度
ｉ Ｒｉ Ｄｉ ｊ Ｎｊ νｊ
０ 3000.000
１（絞り） ∞ 0.100
２ 2.902 1.151 １ 1.61800 63.4
３ 32.666 1.091
４（＊） -1.241 0.700 ２ 1.58400 30.8
５（＊） -2.303 0.194
６（＊） 2.427 2.163 ３ 1.49154 57.8
７（＊） 6.003 0.400
８ ＣＧ ∞ 0.300 1.51680 64.2
９ ＣＧ ∞ 1.494
IMG ∞ 。 f = 5.69 mm, FNo. = 3.50, ω = 31.6 degrees
i Ri Di j Nj νj
0 3000.000
1 (aperture) ∞ 0.100
2 2.902 1.151 1 1.61800 63.4
3 32.666 1.091
4 (*) -1.241 0.700 2 1.58400 30.8
5 (*) -2.303 0.194
6 (*) 2.427 2.163 3 1.49154 57.8
7 (*) 6.003 0.400
8 CG ∞ 0.300 1.51680 64.2
9 CG ∞ 1.494
IMG ∞.

非球面（＊印の面）
第４面
Ｋ＝-4.221684
Ａ＝-0.701107Ｅ-1、 Ｂ＝ 0.101890Ｅ-0、 Ｃ＝-0.488205Ｅ-1、
Ｄ＝ 0.814040Ｅ-2
第５面
Ｋ＝-2.346354
Ａ＝-0.335122Ｅ-2、 Ｂ＝ 0.428246Ｅ-1、 Ｃ＝-0.131082Ｅ-1、
Ｄ＝ 0.132552Ｅ-2
第６面
Ｋ＝-14.471332
Ａ＝ 0.855285Ｅ-2、 Ｂ＝-0.150066Ｅ-2、 Ｃ＝ 0.187204Ｅ-3、
Ｄ＝-0.106925Ｅ-4
第７面
Ｋ＝-64.199428
Ａ＝-0.920187Ｅ-3、 Ｂ＝-0.139255Ｅ-2、 Ｃ＝ 0.212138Ｅ-3、
Ｄ＝-0.106555Ｅ-4 。 Aspherical surface (* marked surface)
The fourth side K = -4.221684
A = -0.701107E-1, B = 0.101890E-0, C = -0.488205E-1,
D = 0.814040E-2
Fifth side K = -2.346354
A = -0.335122E-2, B = 0.428246E-1, C = -0.131082E-1,
D = 0.132552E-2
6th page K = -14.471332
A = 0.855285E-2, B = -0.150066E-2, C = 0.187204E-3,
D = -0.106925E-4
The seventh side K = -64.199428
A = -0.920187E-3, B = -0.139255E-2, C = 0.212138E-3,
D = -0.106555E-4.

上の表記において、例えば「-0.106555Ｅ-4」は「-0.106555×10-4」を意味する。以下においても同様である。 In the above notation, for example, “-0.106555E-4” means “-0.106555 × 10 −4 ”. The same applies to the following.

条件の各パラメータの値
（１） ＤＨ／ＯＡＬ＝０.３２
（２） ν２＝３０.８
（３） ν１＝６３.４
（４） Ｒ１／｜Ｒ２｜＝０.０８９
図１に、実施例１の結像レンズのレンズ構成を示す。また、図２に実施例１の縦収差図、図３に実施例１の横収差図を示す。 Value of each parameter of condition (1) DH / OAL = 0.32
(2) ν2 = 30.8
(3) ν1 = 63.4
(4) R1 / | R2 | = 0.089
FIG. 1 shows the lens configuration of the imaging lens of Example 1. FIG. 2 shows a longitudinal aberration diagram of Example 1, and FIG. 3 shows a lateral aberration diagram of Example 1. FIG.

ｆ＝５．６９ｍｍ、ＦＮｏ．＝３．５０、ω＝３１．６度
ｉ Ｒｉ Ｄｉ ｊ Ｎｊ νｊ
０ ∞ 3000.000
１（絞り） ∞ 0.145
２ 2.429 1.240 １ 1.48749 70.4
３ -617.468 1.099
４（＊） -1.035 0.700 ２ 1.58400 30.8
５（＊） -1.910 0.100
６（＊） 2.176 2.115 ３ 1.49154 57.8
７（＊） 4.664 0.400
８ ＣＧ ∞ 0.300 1.51680 64.2
９ ＣＧ ∞ 1.485
IMG ∞ 。 f = 5.69 mm, FNo. = 3.50, ω = 31.6 degrees
i Ri Di j Nj νj
0 ∞ 3000.000
1 (Aperture) ∞ 0.145
2 2.429 1.240 1 1.48749 70.4
3 -617.468 1.099
4 (*) -1.035 0.700 2 1.58400 30.8
5 (*) -1.910 0.100
6 (*) 2.176 2.115 3 1.49154 57.8
7 (*) 4.664 0.400
8 CG ∞ 0.300 1.51680 64.2
9 CG ∞ 1.485
IMG ∞.

非球面（＊印の面）
第４面
Ｋ＝-3.505424
Ａ＝-0.896453Ｅ-1、 Ｂ＝ 0.109239Ｅ-0、 Ｃ＝-0.505875Ｅ-1、
Ｄ＝ 0.819214Ｅ-2
第５面
Ｋ＝-1.743541
Ａ＝-0.410551Ｅ-2、 Ｂ＝ 0.428383Ｅ-1、 Ｃ＝-0.130681Ｅ-1、
Ｄ＝ 0.139382Ｅ-2
第６面
Ｋ＝-13.340555
Ａ＝ 0.703900Ｅ-2、 Ｂ＝-0.124836Ｅ-2、 Ｃ＝ 0.155977Ｅ-3、
Ｄ＝-0.100085Ｅ-4
第７面
Ｋ＝-38.350089
Ａ＝-0.299223Ｅ-2、 Ｂ＝-0.769406Ｅ-3、 Ｃ＝ 0.138697Ｅ-3、
Ｄ＝-0.828460Ｅ-5 。 Aspherical surface (* marked surface)
4th surface K = -3.505424
A = -0.896453E-1, B = 0.109239E-0, C = -0.505875E-1,
D = 0.819214E-2
Fifth side K = -1.743541
A = -0.410551E-2, B = 0.428383E-1, C = -0.130681E-1,
D = 0.139382E-2
6th page K = -13.340555
A = 0.703900E-2, B = -0.124836E-2, C = 0.155977E-3,
D = -0.100085E-4
Surface 7 K = -38.350089
A = -0.299223E-2, B = -0.769406E-3, C = 0.138697E-3,
D = -0.828460E-5.

条件の各パラメータの値
（１） ＤＨ／ＯＡＬ＝０.３１
（２） ν２＝３０.８
（３） ν１＝７０.４
（４） Ｒ１／｜Ｒ２｜＝０.００４
図４に、実施例２の結像レンズのレンズ構成を示す。図５に実施例２の縦収差図、図６に実施例２の横収差図を示す。 Value of each parameter of condition (1) DH / OAL = 0.31
(2) ν2 = 30.8
(3) ν1 = 70.4
(4) R1 / | R2 | = 0.004
FIG. 4 shows the lens configuration of the imaging lens of Example 2. FIG. 5 shows a longitudinal aberration diagram of Example 2, and FIG. 6 shows a lateral aberration diagram of Example 2.

各収差図において、Ｇは波長：５４６ｎｍでの収差、Ｒは波長６２０ｎｍでの収差、Ｂは波長：４５０ｎｍでの収差を示し、Ｓは波長：５４６ｎｍでのサジタル像面、Ｔは波長：５４６ｎｍでのタンジェンシャル像面を示す。   In each aberration diagram, G represents an aberration at a wavelength of 546 nm, R represents an aberration at a wavelength of 620 nm, B represents an aberration at a wavelength of 450 nm, S represents a sagittal image plane at a wavelength of 546 nm, and T represents a wavelength of 546 nm. The tangential image plane of is shown.

即ち、上に示した実施例１、実施例２の結像レンズは、大きな共役側から順に、第１〜第３レンズを配してなり、第１レンズは、大きな共役側の面が凸面の正レンズ、第２レンズは、小さな共役側に凸面を向けた負のメニスカスレンズ、第３レンズは、大きな共役側に凸面を向けた正のメニスカスレンズである（請求項１）。   In other words, the imaging lenses of Examples 1 and 2 shown above are arranged with first to third lenses in order from the large conjugate side, and the first lens has a convex surface on the large conjugate side. The positive lens and the second lens are a negative meniscus lens having a convex surface facing the small conjugate side, and the third lens is a positive meniscus lens having a convex surface facing the large conjugate side.

また、第３レンズの小さな共役側の面（第７面）が非球面であり、この非球面が、光軸近傍においては小さな共役側に凹で、軸外において、小さな共役側に凸の形状であり（請求項２）、第１レンズの大きな共役側の面から全系の後側主点位置までの光軸上の距離：ＤＨ、第１レンズの大きな共役側の面から第３レンズの小さな共役側の面までの光軸上の距離：ＯＡＬが、条件：
（１） ０．２＜ＤＨ／ＯＡＬ ＜０．４
を満足する（請求項３）。 In addition, the small conjugate side surface (seventh surface) of the third lens is an aspherical surface, and this aspherical surface is concave on the small conjugate side in the vicinity of the optical axis, and is convex on the small conjugate side outside the axis. (Claim 2), the distance on the optical axis from the large conjugate side surface of the first lens to the rear principal point position of the entire system: DH, from the large conjugate side surface of the first lens to the third lens Distance on the optical axis to the small conjugate surface: OAL, conditions:
(1) 0.2 <DH / OAL <0.4
(Claim 3).

さらに、第２レンズの材質のアッベ数：ν２は、条件：
（２） ν２＜４０
を満足し（請求項４）、第１レンズの材質のアッベ数：ν１は、条件：
（３） ν１＞５６
を満足する（請求項５）。 Further, the Abbe number ν2 of the material of the second lens is the condition:
(2) ν2 <40
(Claim 4), the Abbe number of the material of the first lens: ν1 is the condition:
(3) ν1> 56
(Claim 5).

第１レンズの、大きな共役側の面の曲率半径：Ｒ１、小さな共役側の面の曲率半径：Ｒ２は、条件：
（４） ０＜Ｒ１／｜Ｒ２｜＜０．３
を満足し（請求項６）、第１レンズの大きな共役側に「絞り」を有する（請求項７）。そして、第２レンズと第３レンズとがプラスチック材料で形成されている（請求項８）。 The radius of curvature of the first conjugate side surface of the first lens: R1, and the radius of curvature of the small conjugate side surface: R2 are:
(4) 0 <R1 / | R2 | <0.3
(Claim 6), and a “diaphragm” is provided on the large conjugate side of the first lens (Claim 7). The second lens and the third lens are made of a plastic material.

上に示した実施例の結像レンズは、携帯電話に搭載するためのものであり、撮像素子と共に携帯電話に搭載することにより請求項９記載の携帯可能な電子機器として実施できる。   The imaging lens of the embodiment shown above is for mounting on a mobile phone, and can be implemented as a portable electronic device according to claim 9 by mounting it on a mobile phone together with an image sensor.

実施例１の結像レンズの構成を、絞りおよび撮像素子とともに示す図である。FIG. 3 is a diagram illustrating a configuration of an imaging lens of Example 1 together with a diaphragm and an image sensor. 実施例１の縦収差図である。2 is a longitudinal aberration diagram of Example 1. FIG. 実施例１の横収差図である。FIG. 3 is a lateral aberration diagram of Example 1. 実施例２の結像レンズの構成を、絞りおよび撮像素子とともに示す図である。It is a figure which shows the structure of the imaging lens of Example 2 with a stop and an image pick-up element. 実施例２の縦収差図である。FIG. 6 is a longitudinal aberration diagram of Example 2. 実施例２の横収差図である。FIG. 6 is a lateral aberration diagram of Example 2.

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
L1 1st lens L2 2nd lens L3 3rd lens

Claims (9)

大きな共役側から順に、第１〜第３レンズを配してなり、
第１レンズは、大きな共役側の面が凸面の正レンズ、
第２レンズは、小さな共役側に凸面を向けた負のメニスカスレンズ、
第３レンズは、大きな共役側に凸面を向けた正のメニスカスレンズであることを特徴とする結像レンズ。 In order from the large conjugate side, first to third lenses are arranged,
The first lens is a positive lens having a convex surface on the large conjugate side,
The second lens is a negative meniscus lens with a convex surface facing the small conjugate side,
The imaging lens, wherein the third lens is a positive meniscus lens having a convex surface facing the large conjugate side. 請求項１記載の結像レンズにおいて、
第３レンズの小さな共役側の面が非球面であり、この非球面が、光軸近傍においては小さな共役側に凹で、軸外において、小さな共役側に凸の形状であることを特徴とする結像レンズ。 The imaging lens according to claim 1.
The third conjugate surface of the third lens is an aspheric surface, and the aspheric surface has a concave shape on the small conjugate side in the vicinity of the optical axis and a convex shape on the small conjugate side outside the axis. Imaging lens. 請求項１または２記載の結像レンズにおいて、
第１レンズの大きな共役側の面から全系の後側主点位置までの光軸上の距離：ＤＨ、第１レンズの大きな共役側の面から第３レンズの小さな共役側の面までの光軸上の距離：ＯＡＬが、条件：
（１） ０．２＜ＤＨ／ＯＡＬ＜０．４
を満足することを特徴とする結像レンズ。 The imaging lens according to claim 1 or 2,
Distance on the optical axis from the large conjugate side surface of the first lens to the rear principal point position of the entire system: DH, light from the large conjugate side surface of the first lens to the small conjugate side surface of the third lens On-axis distance: OAL, condition:
(1) 0.2 <DH / OAL <0.4
An imaging lens characterized by satisfying 請求項１〜３の任意の１に記載の結像レンズにおいて、
第２レンズの材質のアッベ数：ν２が、条件：
（２） ν２＜４０
を満足することを特徴とする結像レンズ。 The imaging lens according to any one of claims 1 to 3,
Abbe number of material of the second lens: ν2 is the condition:
(2) ν2 <40
An imaging lens characterized by satisfying 請求項１〜４の任意の１に記載の結像レンズにおいて、
第１レンズの材質のアッベ数：ν１が、条件：
（３） ν１＞５５
を満足することを特徴とする結像レンズ。 The imaging lens according to any one of claims 1 to 4,
Abbe number of material of the first lens: ν1 is the condition:
(3) ν1> 55
An imaging lens characterized by satisfying 請求項１〜５の任意の１に記載の結像レンズにおいて、
第１レンズの、大きな共役側の面の曲率半径：Ｒ１、小さな共役側の面の曲率半径：Ｒ２が、条件：
（４） ０＜Ｒ１／｜Ｒ２｜＜０．３
を満足することを特徴とする結像レンズ。 The imaging lens according to any one of claims 1 to 5,
The radius of curvature of the first conjugate side surface of the first lens is R1, and the radius of curvature of the small conjugate side surface is R2.
(4) 0 <R1 / | R2 | <0.3
An imaging lens characterized by satisfying 請求項１〜６の任意の１に記載の結像レンズにおいて、
第１レンズの大きな共役側に絞りを有することを特徴とする結像レンズ。 The imaging lens according to any one of claims 1 to 6,
An imaging lens having a stop on a large conjugate side of the first lens. 請求項１〜７の任意の１に記載の結像レンズにおいて、
第２レンズと第３レンズとがプラスチック材料で形成されることを特徴とする結像レンズ。 The imaging lens according to any one of claims 1 to 7,
An imaging lens, wherein the second lens and the third lens are made of a plastic material. 請求項１〜８の任意の１に記載の結像レンズを搭載した携帯可能な電子機器。
A portable electronic device equipped with the imaging lens according to claim 1.
JP2003285121A 2003-08-01 2003-08-01 Imaging lens and portable electronic device Expired - Fee Related JP4515728B2 (en)

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JP2007094113A (en) * 2005-09-29 2007-04-12 Fujinon Corp Single focal lens
JP2007264181A (en) * 2006-03-28 2007-10-11 Fujinon Corp Imaging lens
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Cited By (9)

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WO2005119326A1 (en) * 2004-06-04 2005-12-15 Seiko Precision Inc. Taking lens
JP2007094113A (en) * 2005-09-29 2007-04-12 Fujinon Corp Single focal lens
JP2007264181A (en) * 2006-03-28 2007-10-11 Fujinon Corp Imaging lens
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JPWO2007119647A1 (en) * 2006-04-14 2009-08-27 コニカミノルタオプト株式会社 Imaging lens and imaging apparatus
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CN106094178A (en) * 2016-07-18 2016-11-09 瑞声科技(新加坡)有限公司 Pick-up lens

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