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JP2599311B2 - Super wide angle lens - Google Patents

Super wide angle lens

Info

Publication number
JP2599311B2
JP2599311B2 JP3179891A JP3179891A JP2599311B2 JP 2599311 B2 JP2599311 B2 JP 2599311B2 JP 3179891 A JP3179891 A JP 3179891A JP 3179891 A JP3179891 A JP 3179891A JP 2599311 B2 JP2599311 B2 JP 2599311B2
Authority
JP
Japan
Prior art keywords
lens
group
concave meniscus
biconvex
wide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP3179891A
Other languages
Japanese (ja)
Other versions
JPH04246606A (en
Inventor
泰彦 阿部
Original Assignee
株式会社コパル
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社コパル filed Critical 株式会社コパル
Priority to JP3179891A priority Critical patent/JP2599311B2/en
Publication of JPH04246606A publication Critical patent/JPH04246606A/en
Application granted granted Critical
Publication of JP2599311B2 publication Critical patent/JP2599311B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は,大きな歪曲収差を有す
る超広角レンズ,特に監視用,車載用テレビカメラ等に
最適な超広角レンズに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-wide-angle lens having a large distortion, and more particularly to an ultra-wide-angle lens which is most suitable for a monitor camera, an on-vehicle television camera and the like.

【0002】[0002]

【従来の技術】一般に監視用,車載用テレビカメラ等に
使用されるレンズは,軽量コンパクトで且つ大画角のも
のが望まれており,特に,車載用テレビカメラ等では,
広範な視野をカバーするために画角が130°以上のも
のが望まれる用になってきている。
2. Description of the Related Art In general, it is desired that a lens used for a surveillance or on-vehicle television camera is lightweight, compact and has a large angle of view.
In order to cover a wide field of view, an object having an angle of view of 130 ° or more has been desired.

【0003】[0003]

【発明が解決しようとする課題】しかしながら,従来の
超広角レンズは,例えば特開平1−113714や特開
平1−156711等に見られる様に,一般的に8から
10枚以上とレンズ構成枚数の多い構造のものがほとん
である。
However, conventional ultra-wide-angle lenses generally have 8 to 10 or more lenses, such as those disclosed in JP-A-1-113714 and JP-A-1-156711. There are many structures.

【0004】そのため,従来の超広角レンズは,コスト
が高く,更に,レンズ枚数が多いために全長が長くなっ
てしまい,カメラの小型化には適さないという問題点が
あった。又,画角的に130°以下のものが多く,近年
の要望には応えられなくなってきている。
[0004] Therefore, the conventional ultra-wide-angle lens has a problem that the cost is high and the total number of lenses is long because of the large number of lenses, which is not suitable for downsizing the camera. In many cases, the angle of view is 130 ° or less, which makes it impossible to meet recent demands.

【0005】[0005]

【課題を解決するための手段】本発明はこの様な問題点
に鑑みてなされたものであり,6群7枚という少ないレ
ンズ構成枚数でありながら,130°の広画角及びFN
o.2.1の十分な明るさを持ち,しかも,レンズ全長
が短く,諸収差が良好に補正された超広角レンズを得る
ことを目的とするものである。
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a wide angle of view of 130 ° and an FN with a small number of lens elements such as seven in six groups.
o. It is an object of the present invention to obtain an ultra-wide-angle lens having a sufficient brightness of 2.1, a short overall lens length, and excellent correction of various aberrations.

【0006】要約すれば,本発明の超広角レンズは,物
体側から順番に,凹メニスカス単レンズからなる負レン
ズの第1群,凹メニスカス単レンズからなる負レンズの
第2群,凹メニスカス単レンズからなる負レンズの第3
群,両凸単レンズからなる正レンズの第4群,両凸単レ
ンズからなる正レンズの第5群,凹メニスカスレンズと
両凸レンズの貼り合わせからなり少なくとも1面の非球
面を有する正レンズの第6群,の6群7枚からなり,数
1〜数3に規定する条件を満足することを特徴とする。
In summary, the super-wide-angle lens according to the present invention comprises, in order from the object side, a first group of a negative meniscus single lens, a second group of a negative meniscus single lens, and a concave meniscus single lens. Third of negative lens consisting of lens
Group, a fourth group of a positive lens composed of a biconvex single lens, a fifth group of a positive lens composed of a biconvex single lens, and a positive lens having at least one aspheric surface formed by laminating a concave meniscus lens and a biconvex lens. The sixth group is composed of seven elements in six groups, and satisfies the conditions defined in Expressions 1 to 3.

【数1】f<|f1,2 |<2f[Equation 1] f <| f 1,2 | <2f

【数2】ν6N<ν6P,N6N>N6P [ Equation 2] ν 6N6P , N 6N > N 6P

【数3】|R1 |<|R2 | 但し, f :全系の合成焦点距離 f1,2 :第1,2群の合成焦点距離 ν6N :第6群の凹メニスカスレンズのアッベ数 ν6P :第6群の両凸レンズのアッベ数 N6N :第6群の凹メニスカスレンズの屈折率 N6P :第6群の両凸レンズの屈折率 R1 :第5群の物体側の面の曲率半径 R2 :第5群の像面側の面の曲率半径| R 1 | <| R 2 | where f: combined focal length of the entire system f 1,2 : combined focal length of the first and second groups ν 6N : Abbe number of the concave meniscus lens of the sixth group ν 6P : Abbe number of the biconvex lens of the sixth group N 6N : refractive index of the concave meniscus lens of the sixth group N 6P : refractive index of the biconvex lens of the sixth group R 1 : curvature of the object side surface of the fifth group Radius R 2 : radius of curvature of the image-side surface of the fifth lens unit

【0007】[0007]

【作用】本発明では大6群の少なくとも1面の非球面レ
ンズを用いることにより,超広角における歪曲収差及び
コマ収差を補正すると共に,レンズ構成枚数を削減し,
レンズ全長の短縮を図っている。
According to the present invention, by using at least one aspherical lens of six groups, distortion and coma at an ultra-wide angle are corrected, and the number of lens elements is reduced.
The overall length of the lens has been reduced.

【0008】数1の条件は前群発散系を構成するための
条件であり,非点収差,コマ収差及び全系の小型化に関
連する条件である。|f1 |がfよりも短いと,発散系
で発生するコマ収差が著しく大きくなり,非球面をレン
ズを用いても収差補正が困難になる。又,|f1 |が2
fを越えると,バックフォーカスが短くなり,非点収差
の補正が困難になる。
The condition of Equation 1 is a condition for forming the front group divergence system, and is a condition relating to astigmatism, coma aberration, and miniaturization of the entire system. When | f 1 | is shorter than f, the coma generated in the divergent system becomes extremely large, and it becomes difficult to correct the aberration even if a lens is used for the aspherical surface. Also, | f 1 |
When f exceeds f, the back focus becomes short, and it becomes difficult to correct astigmatism.

【0009】数2の条件は色収差の補正に関連する条件
である。この条件が満たされないと色収差が大きくな
り,補正が困難になる。
The condition of Equation 2 is a condition relating to correction of chromatic aberration. If this condition is not satisfied, chromatic aberration will increase, making correction difficult.

【0010】数3の条件は後群収束系での非点収差及び
コマ収差を補正する条件である。この条件が満たされな
いと,非点収差及びコマ収差が著しく大きくなってしま
い,非球面レンズを用いても収差補正が困難になっる。
The condition of Equation 3 is a condition for correcting astigmatism and coma in the rear group convergence system. If this condition is not satisfied, astigmatism and coma will increase significantly, making it difficult to correct aberrations even with an aspheric lens.

【0011】[0011]

【実施例】以下,図面を参照して本発明の実施例を説明
する。図1(第1実施例)及び図6(第2実施例)の光
軸断面図に示す様に本発明の超広角レンズは,物体側か
ら順番に,凹メニスカス単レンズ1からなる負レンズの
第1群,凹メニスカス単レンズ2からなる負レンズの第
2群,凹メニスカス単レンズ3からなる負レンズの第3
群,両凸単レンズ4からなる正レンズの第4群,両凸単
レンズ5からなる正レンズの第5群,凹メニスカスレン
ズ6と両凸レンズ7の貼り合わせからなり少なくとも1
面の非球面を有する正レンズの第6群,の6群7枚から
なり,上述の数1〜数3に規定する条件を満足する。
Embodiments of the present invention will be described below with reference to the drawings. As shown in the optical axis cross-sectional views of FIG. 1 (first embodiment) and FIG. 6 (second embodiment), the super-wide-angle lens of the present invention is a negative lens composed of a concave meniscus single lens 1 in order from the object side. The first group, the second group of the negative lens composed of the concave meniscus single lens 2, and the third group of the negative lens composed of the concave meniscus single lens 3
Group, a fourth group of positive lenses composed of a biconvex single lens 4, a fifth group of positive lenses composed of a biconvex single lens 5, at least one lens composed of a cemented concave meniscus lens 6 and a biconvex lens 7.
The sixth lens unit includes a sixth lens unit including a sixth lens unit having a surface aspherical surface, and satisfies the above-described conditions defined in Expressions 1 to 3.

【0012】又,上記の第1及び第2実施例において
は,両凸レンズ7の像面側の面r13が非球面を形成し,
その非球面形状は次の数4で規定される。
[0012] Further, in the first and second embodiments described above, the surface r 13 of the image plane side of the biconvex lens 7 forms an aspherical surface,
The aspheric shape is defined by the following equation (4).

【0013】[0013]

【数4】 Cy2 Z=────────────── +Dy4 +Ey5 +Fy8 +Gy10 1+(1−εC2 2 1/2 但し,数4において, Z:光軸からの高さがyの非球面上の点の非球面頂点の
接平面からの距離。 y:光軸からの高さ。 C:非球面頂点の曲率(=1/r)。 ε:円錐定数。 D,E,F,G:非球面係数。 を表すものとする。
Equation 4] Cy 2 Z = ────────────── + Dy 4 + Ey 5 + Fy 8 + Gy 10 1+ (1-εC 2 y 2) 1/2 Here, in Equation 4, Z: The distance from the tangent plane of the aspherical vertex of the point on the aspheric surface whose height from the optical axis is y. y: height from the optical axis. C: curvature of the aspherical vertex (= 1 / r). ε: conical constant. D, E, F, G: aspherical surface coefficients. Shall be expressed.

【0014】次に,第1実施例の具体的な数値を表1
に,第2実施例の具体的な数値を表2に示す。尚,表中
において,r1 〜r13は物体側から順次レンズ各面の曲
率半径を,d1 〜d12は物体側から順次各レンズの肉圧
又はレンズ各面間の空気間隔を,n1 〜n7 は物体側か
ら順次各レンズの屈折率を,ν1 〜ν7 は物体側から順
次各レンズのアッベ数を各々示す。
Next, specific numerical values of the first embodiment are shown in Table 1.
Table 2 shows specific numerical values of the second embodiment. In the table, r 1 to r 13 indicate the radius of curvature of each lens surface in order from the object side, d 1 to d 12 indicate the wall pressure of each lens or the air gap between each lens surface in order from the object side, and n 1 to n 7 indicate the refractive index of each lens sequentially from the object side, and ν 1 to ν 7 indicate the Abbe number of each lens sequentially from the object side.

【0015】又,図2は第1実施例の球面収差,図3は
第1実施例の非点収差,図4は第1実施例の歪曲収差,
図5は第1実施例の色収差,図7は第2実施例の球面収
差,図8は第2実施例の非点収差,図9は第2実施例の
歪曲収差,図10は第2実施例の色収差を各々示す。
又,これらの特性曲線において,dはd線,FはF線,
CはC線を各々示し,SCはサインコンデションを示
す。更に,図3及び図8において,Sはサジタル方向,
Mはメリディオナル方向を各々示す。
FIG. 2 shows the spherical aberration of the first embodiment, FIG. 3 shows the astigmatism of the first embodiment, and FIG. 4 shows the distortion of the first embodiment.
5 is chromatic aberration of the first embodiment, FIG. 7 is spherical aberration of the second embodiment, FIG. 8 is astigmatism of the second embodiment, FIG. 9 is distortion of the second embodiment, and FIG. The chromatic aberrations of the examples are respectively shown.
In these characteristic curves, d is the d line, F is the F line,
C indicates the C line, and SC indicates the sign condition. 3 and 8, S is the sagittal direction,
M indicates the meridional direction.

【0016】[0016]

【表1】 [Table 1]

【0017】[0017]

【表2】 [Table 2]

【0018】[0018]

【発明の効果】以上説明した様に本発明によれば,上記
実施例及び収差曲線に見られる様に,6群7枚構成とい
う少ないレンズ構成枚数でありながら,画角130°以
上の広範な範囲を包括し,Fナンバも2.1と十分な明
るさを持ち,レンズ全長が短く,しかも諸収差が良好に
補正された超広角レンズを得ることができるものであ
り,車載用,監視用テレビカメラのためのレンズとして
好適なる特性を得ることができる。
As described above, according to the present invention, as can be seen from the above-described embodiment and the aberration curve, a wide lens having an angle of view of 130 ° or more can be obtained even though the number of lens elements is as small as 6 elements and 7 elements. It covers a wide range, has an F-number of 2.1, has a sufficient brightness, has a short overall lens length, and can provide an ultra-wide-angle lens with excellent correction of various aberrations. Characteristics suitable as a lens for a television camera can be obtained.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の第1の実施例に係る超広角レンズの光
軸断面図である。
FIG. 1 is an optical axis cross-sectional view of an ultra-wide-angle lens according to a first example of the present invention.

【図2】上記第1の実施例の球面収差を示す図。FIG. 2 is a diagram showing the spherical aberration of the first embodiment.

【図3】上記第1の実施例の非点収差を示す図。FIG. 3 is a diagram showing astigmatism of the first embodiment.

【図4】上記第1の実施例の歪曲収差を示す図。FIG. 4 is a diagram showing the distortion of the first embodiment.

【図5】上記第1の実施例の色収差を示す図。FIG. 5 is a diagram illustrating chromatic aberration according to the first embodiment.

【図6】本発明の第2の実施例に係る超広角レンズの光
軸断面図である。
FIG. 6 is an optical-axis sectional view of an ultra-wide-angle lens according to a second embodiment of the present invention.

【図7】上記第2の実施例の球面収差を示す図。FIG. 7 is a diagram showing the spherical aberration of the second embodiment.

【図8】上記第2の実施例の非点収差を示す図。FIG. 8 is a diagram showing astigmatism of the second embodiment.

【図9】上記第2の実施例の歪曲収差を示す図。FIG. 9 is a diagram illustrating distortion of the second embodiment.

【図10】上記第2の実施例の色収差を示す図。FIG. 10 is a diagram showing chromatic aberration according to the second embodiment.

【符号の説明】[Explanation of symbols]

1 第1レンズ 2 第2レンズ 3 第3レンズ 4 第4レンズ 5 第5レンズ 6 第6レンズ 7 第7レンズ DESCRIPTION OF SYMBOLS 1 1st lens 2 2nd lens 3 3rd lens 4 4th lens 5 5th lens 6 6th lens 7 7th lens

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 物体側から順番に,凹メニスカス単レン
ズからなる負レンズの第1群,凹メニスカス単レンズか
らなる負レンズの第2群,凹メニスカス単レンズからな
る負レンズの第3群,両凸単レンズからなる正レンズの
第4群,両凸単レンズからなる正レンズの第5群,凹メ
ニスカスレンズと両凸レンズの貼り合わせからなり少な
くとも1面の非球面を有する正レンズの第6群,の6群
7枚からなり,次の(1),(2)及び(3)の条件を
満足することを特徴とする超広角レンズ。 (1)f<|f1,2 |<2f (2)ν6N<ν6P,N6N>N6P (3)|R1 |<|R2 | 但し, f :全系の合成焦点距離 f1,2 :第1,2群の合成焦点距離 ν6N :第6群の凹メニスカスレンズのアッベ数 ν6P :第6群の両凸レンズのアッベ数 N6N :第6群の凹メニスカスレンズの屈折率 N6P :第6群の両凸レンズの屈折率 R1 :第5群の物体側の面の曲率半径 R2 :第5群の像面側の面の曲率半径
1. A first group of negative lenses composed of a concave meniscus single lens, a second group of negative lenses composed of a concave meniscus single lens, a third group of negative lenses composed of a concave meniscus single lens, in order from the object side. A fourth group of positive lenses formed of a biconvex single lens, a fifth group of positive lenses formed of a biconvex single lens, and a sixth group of positive lenses formed by bonding a concave meniscus lens and a biconvex lens and having at least one aspheric surface. An ultra-wide-angle lens comprising seven elements in six groups and satisfying the following conditions (1), (2) and (3). (1) f <| f 1,2 | <2f (2) ν 6N6P , N 6N > N 6P (3) | R 1 | <| R 2 | where f: composite focal length f of the whole system 1,2 : Composite focal length of the first and second groups ν 6N : Abbe number of the concave meniscus lens of the sixth group ν 6P : Abbe number of the biconvex lens of the sixth group N 6N : Refraction of the concave meniscus lens of the sixth group Rate N 6P : Refractive index of the biconvex lens of the sixth group R 1 : Radius of curvature of the object-side surface of the fifth group R 2 : Curvature radius of the image-side surface of the fifth group
JP3179891A 1991-01-31 1991-01-31 Super wide angle lens Expired - Lifetime JP2599311B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3179891A JP2599311B2 (en) 1991-01-31 1991-01-31 Super wide angle lens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3179891A JP2599311B2 (en) 1991-01-31 1991-01-31 Super wide angle lens

Publications (2)

Publication Number Publication Date
JPH04246606A JPH04246606A (en) 1992-09-02
JP2599311B2 true JP2599311B2 (en) 1997-04-09

Family

ID=12341092

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3179891A Expired - Lifetime JP2599311B2 (en) 1991-01-31 1991-01-31 Super wide angle lens

Country Status (1)

Country Link
JP (1) JP2599311B2 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005345577A (en) * 2004-05-31 2005-12-15 Kyocera Corp Superwide-angle lens
JP4625711B2 (en) * 2005-03-31 2011-02-02 日本電産ニッシン株式会社 Wide angle lens
JP5369867B2 (en) * 2009-04-24 2013-12-18 株式会社リコー Wide angle lens and imaging device
JP5544834B2 (en) * 2009-11-18 2014-07-09 株式会社ニコン Wide angle lens and optical apparatus having the wide angle lens
CN103984083B (en) * 2014-02-21 2018-01-30 襄阳锦翔光电科技股份有限公司 A kind of optical lens assembly
WO2016194110A1 (en) 2015-06-01 2016-12-08 オリンパス株式会社 Single-focus optical system and optical device provided with same
CN104849835B (en) * 2015-06-06 2017-07-14 广东弘景光电科技股份有限公司 A kind of flake monitoring optical system and its camera lens of application
CN108139569B (en) 2016-07-25 2020-12-11 日本电产三协株式会社 Wide-angle lens
TWI650592B (en) 2018-04-18 2019-02-11 大立光電股份有限公司 Camera optical lens group, image capturing device and electronic device
CN114047597B (en) * 2021-11-03 2023-05-02 福建福光股份有限公司 Fixed focus optical lens and imaging method thereof

Also Published As

Publication number Publication date
JPH04246606A (en) 1992-09-02

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