JPH0468307A - Super-wide-angle lens - Google Patents
Super-wide-angle lensInfo
- Publication number
- JPH0468307A JPH0468307A JP2181182A JP18118290A JPH0468307A JP H0468307 A JPH0468307 A JP H0468307A JP 2181182 A JP2181182 A JP 2181182A JP 18118290 A JP18118290 A JP 18118290A JP H0468307 A JPH0468307 A JP H0468307A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- object side
- wide
- angle
- lenses
- 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.)
- Granted
Links
- 230000005499 meniscus Effects 0.000 claims abstract description 10
- 239000002131 composite material Substances 0.000 abstract 1
- 230000004075 alteration Effects 0.000 description 37
- 238000010586 diagram Methods 0.000 description 17
- 201000009310 astigmatism Diseases 0.000 description 4
- 206010010071 Coma Diseases 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 241000168254 Siro Species 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
Landscapes
- Lenses (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
(産業上の利用分野)
本発明は、監視用などに用いられる超広角レンズに係わ
り、特に、逆望遠型のものに関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an ultra-wide-angle lens used for surveillance purposes, and particularly to an inverted telephoto lens.
(従来の技術)
近年、監視用、車載用等のカメラレンズに対しては、そ
の使用目的による超広角化と、使用上の制約によるコン
パクト化とが望まれている。(Prior Art) In recent years, camera lenses for surveillance, vehicle use, etc. are desired to have an ultra-wide angle depending on the purpose of use, and to be more compact due to usage constraints.
従来、監視用、車載用等に用いられているカメラレンズ
としては、例えば、特開昭59−127012号公報あ
るいは特開平1−113714号公報に記載されている
ものが知られている。2. Description of the Related Art Conventionally, known camera lenses used for monitoring purposes, in-vehicle use, etc. are those described in, for example, Japanese Patent Application Laid-Open No. 59-127012 or Japanese Patent Application Laid-Open No. 1-113714.
特開昭59−127012号公報記載のものは、6群7
枚という非常に少ないレンズ構成で、F / 1.6と
明るく、諸収差も良好に補正されているが、画角が11
0°と狭く、監視用カメラレンズとしては十分でなかっ
た。The one described in JP-A-59-127012 has 6 groups and 7
The lens has a very small number of lenses, is bright at F/1.6, and various aberrations are well corrected, but the angle of view is 11.
It was narrow at 0° and was not sufficient as a surveillance camera lens.
また、特開平1−113714号公報記載のものは、8
群9枚構成で、さらに非球面レンズを用いることにより
、F/1.4という大きな口径比を実現し、諸収差も良
好に補正され、画角も 125°程度を得ているものの
、構成枚数が多いため、コンパクト性の点で問題を有し
ており、さらに、構成枚数が多いことに加えて、非球面
が設けられているため、コストの点でも問題を有してい
た。Moreover, the one described in JP-A-1-113714 is 8
By using a 9-element group and an aspherical lens, a large aperture ratio of F/1.4 is achieved, various aberrations are well corrected, and the angle of view is approximately 125°, but the number of elements in the group is... Since there are many components, there is a problem in terms of compactness, and in addition to the large number of constituent elements, there is also a problem in terms of cost because an aspherical surface is provided.
また、画角が1800に及ぶ魚眼レンズでは、特公昭4
9−20535号公報あるいは特開昭63−17421
号公報が開示されているが、ともにF/2.8程度と暗
く、さらに構成枚数も8〜10枚と多く、監視用には不
適であった。In addition, a fisheye lens with an angle of view of 1800 degrees
Publication No. 9-20535 or JP-A-63-17421
However, both of them are dark at about F/2.8 and have a large number of frames, 8 to 10, making them unsuitable for monitoring purposes.
(発明が解決しようとする課題)
監視用、車載用なとのカメラレンズとして、前述した超
広角レンズでは、画角、コンパクト性、コストの点で問
題が多く、構成枚数を削減し、さらに超広角化、コンパ
クト化および低コスト化を図ることが望まれる。(Problem to be solved by the invention) The above-mentioned ultra-wide-angle lens used as a camera lens for surveillance or in-vehicle use has many problems in terms of angle of view, compactness, and cost. It is desired to achieve wider angle, more compactness, and lower cost.
ところで、この種のカメラレンズは、その使用目的から
歪曲収差が良好でないレンズを採用することができ、こ
のことはレンズの設計上好都合である。Incidentally, for this type of camera lens, a lens having poor distortion aberration can be used depending on the intended use, and this is advantageous in terms of lens design.
本発明は、このことを利用し、上述の課題を解決しよう
とするもので、例えば、焦点距離に比べ、バックフォー
カスが約2.5倍以上で、画角が130°〜180°に
及ぶにもかかわらず、構成枚数がきわめて少なく、コン
パクトで、低コストな、明るく高性能な超広角レンズを
提供することを目的とするものである。The present invention utilizes this fact and attempts to solve the above-mentioned problems. Nevertheless, the objective is to provide a bright, high-performance ultra-wide-angle lens that is compact, low-cost, and has an extremely small number of components.
(課題を解決するための手段)
本発明の超広角レンズは、前述した目的を達成するため
に、物体側から順に、前群と、後群とに分けられ、さら
に、前記前群は、物体側から順に、物体側に凸面を向け
た負のメニスカスレンズと、物体側に凸面を向けた負の
メニスカスレンズと、正レンズとの3枚のレンズからな
り、また、前記後群は、物体側から順に、接合された両
凹レンズおよび両凸レンズと、正レンズとの3枚のレン
ズからなり、かつ、次の(イ) (0) (ハ
)(ニ)の条件を満たすものである。(Means for Solving the Problems) In order to achieve the above-mentioned object, the ultra-wide-angle lens of the present invention is divided into a front group and a rear group in order from the object side, and furthermore, the front group In order from the side, it consists of three lenses: a negative meniscus lens with a convex surface facing the object side, a negative meniscus lens with a convex surface facing the object side, and a positive lens. It consists of three lenses: a cemented biconcave lens, a biconvex lens, and a positive lens, and satisfies the following conditions (a), (0), (c), and (d).
(句−1,75<f、。/f<−1,55(DJ (1
,04< f ・(n4II、) / R4<0.06
5(ハ) −0,55< R6/ R6<−0
゜25(ニ) ν 、〈30ただし
、ここで、
+12は、物体側から1番目および2番目のレンズの合
成焦点距離、
fは、全系の焦点距離、
niC4=4.5)は、物体側からi番目のレンズの屈
折率、
Ri′(i=4.6)は、物体側からi番目のレンズの
像側の面の曲率半径、
R6は、物体側から6番目のレンズの物体側の面の曲率
半径、
ν3は、物体側から3番目のレンズのアツベ数
である。(phrase -1,75<f,./f<-1,55(DJ (1
,04<f・(n4II,)/R4<0.06
5(c) -0,55<R6/ R6<-0
゜25(d) ν,〈30where, +12 is the combined focal length of the first and second lenses from the object side, f is the focal length of the entire system, niC4=4.5) is the object The refractive index of the i-th lens from the object side, Ri' (i = 4.6) is the radius of curvature of the image-side surface of the i-th lens from the object side, and R6 is the object-side surface of the 6th lens from the object side. The radius of curvature of the surface, ν3, is the Abbe number of the third lens from the object side.
(作用)
本発明の超広角レンズは、前述した構成により、明るさ
と高性能を保持しながら、構成枚数を削減して、コンパ
クト化および低コスト化を図ったものである。ここで、
前述した各条件(イ)(+1) (ハ)(:)につ
いて説明する。(Function) The ultra-wide-angle lens of the present invention has the above-described structure, and while maintaining brightness and high performance, reduces the number of lenses in the lens structure, thereby achieving compactness and low cost. here,
Each of the conditions (a) (+1) (c) (:) described above will be explained.
条件(伺は、レンズ系全体の小型化と収差補正、および
広画角の確保に関連する条件である。Conditions are related to miniaturization of the entire lens system, correction of aberrations, and ensuring a wide angle of view.
すなわち、条件(イ)の下限を越えると、入射瞳は後方
へ遠ざかり、レンズ全系の全長、前玉径の増大を招き、
コンパクト化が困難になると同時に、像面彎曲が悪化し
、好ましくなく、また、歪曲収差の発生が押さえられ、
130°〜 180°という広画角の確保が困難になる
。逆に、条件(イ)の上限を越えると、球面収差が補正
過剰となり、さらにコマ収差が増大し、補正が困難とな
り、好ましくない。In other words, when the lower limit of condition (a) is exceeded, the entrance pupil moves backward, causing an increase in the total length of the entire lens system and the diameter of the front lens.
It becomes difficult to make the lens compact, and at the same time, the curvature of field worsens, which is undesirable, and the occurrence of distortion can be suppressed.
It becomes difficult to secure a wide angle of view of 130° to 180°. On the other hand, if the upper limit of condition (a) is exceeded, spherical aberration will be overcorrected, and coma aberration will further increase, making correction difficult, which is not preferable.
条件(ロ)は、条件(イ)に関連して、主に球面収差を
補正するための条件である。すなわち、条件(ロ)の下
限を越えると、球面収差が補正不足となり、好ましくな
い。逆に、条件(ロ)の上限を越えると、高次の球面収
差が発生し、補正が困難となり、好ましくない。Condition (b) is related to condition (a) and is mainly a condition for correcting spherical aberration. That is, if the lower limit of condition (b) is exceeded, spherical aberration will be insufficiently corrected, which is not preferable. On the other hand, if the upper limit of condition (b) is exceeded, high-order spherical aberration will occur and correction will become difficult, which is not preferable.
条件(ハ)は、条件(イ)および条件(ロ)に関連して
、球面収差、非点収差および像面彎曲をバランス良く補
正するための条件である。すなわち、条件(ハ)の下限
を越えると、球面収差が補正不足となると同時に、非点
隔差が増大し、好ましくない。逆に、条件(ハ)の上限
を越えると、球面収差が補正過剰となると同時に、像面
彎曲が増大し、好ましくない。Condition (c) is related to condition (a) and condition (b) and is a condition for correcting spherical aberration, astigmatism, and field curvature in a well-balanced manner. That is, when the lower limit of condition (c) is exceeded, spherical aberration becomes insufficiently corrected and at the same time astigmatism increases, which is not preferable. On the other hand, if the upper limit of condition (c) is exceeded, the spherical aberration will be overcorrected and at the same time, the curvature of field will increase, which is not preferable.
条件(駒は、倍率の色収差の補正に関するものである。The conditions (frames) are related to correction of chromatic aberration of magnification.
すなわち、条件(ニ)の上限を越えると、前群発散系で
発生する倍率の色収差の補正が困難となり、好ましくな
い。That is, if the upper limit of condition (d) is exceeded, it becomes difficult to correct the chromatic aberration of magnification occurring in the front group diverging system, which is not preferable.
(実施例)
つぎに、本発明の超広角レンズの実施例について、図面
を参照しながら説明する。(Example) Next, an example of the ultra-wide-angle lens of the present invention will be described with reference to the drawings.
以下に、4つの数値実施例を示すが、これら数値実施例
の超広角レンズは、第1図、第3図、第5図および第7
図のレンズ構成図に示すように、物体側すなわち前側(
図示左側)から順に、前群Aと、後群Bとに分けられる
。さらに、前記前群Aは、物体側から順に、物体側に凸
面を向けた負のメニスカスレンズAIと、物体側に凸面
を向けた負のメニスカスレンズA2と、両凸の正レンズ
A3との3枚のレンズからなっている。また、前記後群
Bは、物体側から順に、接合された両凹レンズB1およ
び両凸レンズB2と、両凸の正レンズB3との3枚のレ
ンズからなっている。さらに、これら実施例の超広角レ
ンズは、ビデオカメラ用であるため、最後部に平行平面
板Cが設けられている。なお、絞りは、前記前群Aと後
群Bとの間に設けられる。Four numerical examples are shown below, and the ultra-wide-angle lenses of these numerical examples are shown in Figs.
As shown in the lens configuration diagram in the figure, the object side, that is, the front side (
They are divided into a front group A and a rear group B in order from the left side in the figure. Further, the front group A includes, in order from the object side, a negative meniscus lens AI with a convex surface facing the object side, a negative meniscus lens A2 with a convex surface facing the object side, and a biconvex positive lens A3. It consists of several lenses. The rear group B is composed of three lenses, in order from the object side: a cemented biconcave lens B1 and a biconvex lens B2, and a biconvex positive lens B3. Furthermore, since the ultra-wide-angle lenses of these examples are for video cameras, a parallel plane plate C is provided at the rearmost portion. Note that the diaphragm is provided between the front group A and the rear group B.
そして、いずれの数値実施例の超広角レンズも、次のm
(o) (ハ) (ニ)の条件を満たして
いる。The super wide-angle lens of any numerical example has the following m
(o) (c) (d) conditions are met.
(イ) −1,75< f 、□/f<−(,
55(C) 0.04< f ・(n4n5 ) /
R4’ <0.(165(ハ) −0,55<R6
/R6<−0,25(ニ) ν 、
<30ただし、ここで、
fl。は、前群Aの物体側から1番目および2番目のレ
ンズの合成焦点距離、
fは、全系の焦点距離、
ni(i=4.5)は、物体側から1番目のレンズの屈
折率、
Ri′(i=4.6)は、物体側がら1番目のレンズの
像側の面の曲率半径、
R6は、物体側から6番目のレンズの物体側の面の曲率
半径、
ν、は、物体側から3番目のレンズのアツベである。(B) -1,75< f , □/f<-(,
55(C) 0.04< f ・(n4n5) /
R4'<0. (165(c) -0,55<R6
/R6<-0,25(d) ν,
<30 However, here, fl. is the combined focal length of the first and second lenses from the object side of the front group A, f is the focal length of the entire system, ni (i=4.5) is the refractive index of the first lens from the object side , Ri' (i=4.6) is the radius of curvature of the image side surface of the first lens from the object side, R6 is the radius of curvature of the object side surface of the sixth lens from the object side, ν is , the third lens from the object side.
前記条件(() (o) (ハ)(駒 を設定
した理由は、以下のとおりである。The reason for setting the conditions (() (o) (c)) (pieces) is as follows.
条件(イ)は、レンズ系全体の小型化と収差補正、およ
び広画角の確保に関連する条件である。Condition (a) is a condition related to miniaturization of the entire lens system, correction of aberrations, and ensuring a wide angle of view.
すなわち、条件(旬の下限を越えると、入射瞳は後方へ
遠ざかり、レンズ全系の全長、前玉径の増大を招き、コ
ンパクト化が困難になると同時に、像面彎曲が悪化し、
好ましくな(、また、歪曲収差の発生が押さえられ、1
300〜18o0という広画角の確保が困難になる。逆
に、条件(イ)の上限を越えると、球面収差が補正過剰
となり、さらにコマ収差が増大し、補正が困難となり、
好ましくない。In other words, if the lower limit of the condition is exceeded, the entrance pupil moves backward, causing an increase in the overall length of the entire lens system and the diameter of the front lens, making it difficult to make it compact, and at the same time worsening the field curvature.
(Also, the occurrence of distortion aberration is suppressed, and 1
It becomes difficult to secure a wide angle of view of 300 to 18o0. On the other hand, if the upper limit of condition (a) is exceeded, spherical aberration will be overcorrected, coma aberration will further increase, and correction will become difficult.
Undesirable.
条件(ロ)は、条件(イ)に関連して、主に球面収差を
補正するための条件である。すなわち、条件(0)の下
限を越えると、球面収差が補正不足となり、好ましくな
い。逆に、条件(ロ)の上限を越えると、高次の球面収
差が発生し、補正が困難となり、好ましくない。Condition (b) is related to condition (a) and is mainly a condition for correcting spherical aberration. That is, if the lower limit of condition (0) is exceeded, spherical aberration will be insufficiently corrected, which is not preferable. On the other hand, if the upper limit of condition (b) is exceeded, high-order spherical aberration will occur and correction will become difficult, which is not preferable.
条件(ハ)は、条件(イ)および条件(ロ)に関連して
、球面収差、非点収差および像面彎曲をバランス良く補
正するための条件である。すなわち、条件(ハ)の下限
を越えると、球面収差が補正不足となると同時に、非点
隔差が増大し、好ましくない。逆に、条件(ハ)の上限
を越えると、球面収差が補正過剰となると同時に、像面
彎曲が増大し、好ましくない。Condition (c) is related to condition (a) and condition (b) and is a condition for correcting spherical aberration, astigmatism, and field curvature in a well-balanced manner. That is, when the lower limit of condition (c) is exceeded, spherical aberration becomes insufficiently corrected and at the same time astigmatism increases, which is not preferable. On the other hand, if the upper limit of condition (c) is exceeded, the spherical aberration will be overcorrected and at the same time, the curvature of field will increase, which is not preferable.
条件(:)は、倍率の色収差の補正に関するものである
。すなわち、条件(ハ)、(ニ)の上限を越えると、前
群発散系で発生する倍率の色収差の補正が困難となり、
好ましくない。The condition (:) relates to correction of chromatic aberration of magnification. In other words, if the upper limits of conditions (c) and (d) are exceeded, it becomes difficult to correct the chromatic aberration of magnification that occurs in the front group divergence system.
Undesirable.
つぎに、4つの数値実施例を示す。これら数値実施例に
おいて、第1図、第3図、第5図および第7図にも示す
ように、r+ (i=1+ ・・・、13)は、物体
側からi番目の屈折球面(レンズ面)の曲率半径、d、
(i=1.・・・、12)は、物体側からi番目の屈折
球面とi+1番目の屈折球面との間の間隔(レンズ厚ま
たは空気間隔)、niおよびν、(i=1.・・・、7
)は、各々、物体側からi番目のレンズのガラスの屈折
率ndおよびアツベ数シロである。また、fはレンズ全
系の焦点距離、Fは口径比12ωは所定の画面に対応す
る画角である。Next, four numerical examples will be shown. In these numerical examples, as shown in FIGS. 1, 3, 5, and 7, r+ (i=1+..., 13) is the i-th refractive spherical surface (lens radius of curvature of surface), d,
(i=1...., 12) is the distance (lens thickness or air distance) between the i-th refractive spherical surface and the i+1-th refractive spherical surface from the object side, ni and ν, (i=1.・..., 7
) are the refractive index nd and the Atsbe number of the glass of the i-th lens from the object side, respectively. Furthermore, f is the focal length of the entire lens system, and F is the aperture ratio of 12ω, which is the angle of view corresponding to a predetermined screen.
なお、前記条件(ロ)(ハ)におけるR4R6,R6’
は、各々、R4= r s、 R6=r 101R6
= r zである。In addition, R4R6, R6' in the above conditions (b) and (c)
are, respectively, R4=rs, R6=r 101R6
= r z.
〈数値実施例1〉
r=19.8
d、 =0.9 ni =1.589]3 v、
=61.3r2=7.0
d2=5.0
r3= 20.71
d3=f1.9 n2 =l、7]300 v
2 = 53.9r4==54
d4=5.0
r5= 33.01
d 、=7.0 、 n 3 =1.78472
1/ 3 =25.7r 6 = −12,183
d6=4.2
rt”−1[1,9
d、=1.5
rs” 4.914
d8=3.8
r 9 = −9,12
d9=0.1
r+o= 11.3
d+o=3.2
r 11= −30,Hll
d、、=1.O
r 123 ′
d1□=4.0
r、3’=CKI
f=3.48
そして、
f 12/ f = −1,70
f ・(n4−R15) / re =[1,060r
Io/ r ++
ν3=25.7
シ 、=47.8
シ、=25.7
シ、=64.2
シロ=53.9
2ω= 131’
1.71300
0.37
n 4 = 1.78472
n 5 = 1.70030
n ? =1.51680
F/1.6
である。<Numerical Example 1> r=19.8 d, =0.9 ni =1.589]3 v,
=61.3r2=7.0 d2=5.0 r3=20.71 d3=f1.9 n2 =l, 7] 300 v
2=53.9r4==54 d4=5.0 r5=33.01 d,=7.0, n3=1.78472
1/3 = 25.7 r 6 = -12,183 d6 = 4.2 rt"-1 [1,9 d, = 1.5 rs" 4.914 d8 = 3.8 r 9 = -9,12 d9 =0.1 r+o= 11.3 d+o=3.2 r 11= -30,Hll d,,=1. Or 123' d1□=4.0 r, 3'=CKI f=3.48 And f 12/ f = -1,70 f ・(n4-R15) / re = [1,060r
Io/ r ++ ν3 = 25.7 shi, = 47.8 shi, = 25.7 shi, = 64.2 shiro = 53.9 2ω = 131' 1.71300 0.37 n 4 = 1.78472 n 5 = 1.70030n? =1.51680 F/1.6.
前記数値実施例1のレンズ構成図を第1図に、また、そ
の数値実施例1の収差曲線図を第2図に示す。なお、第
4図、第6図および第8図も同様であるが、第2図(a
)において、縦軸は入射高で、その上端はF/16の入
射高である。そして、横軸は縦の収差であり、実線dは
d線の球面収差、破線gはg線の球面収差を示している
。また、第2図(b)において、縦軸は半画角であり、
その上端は65.5°の半画角である。そして、横軸は
像面位置であり、実線Sはサジタル像面、点線Mはメリ
ジオナル像面を示している。さらに、第2図(c)にお
いて、縦軸は半画角であり、その上端は65.5°の半
画角である。そして、横軸は歪曲収差である。A lens configuration diagram of Numerical Example 1 is shown in FIG. 1, and an aberration curve diagram of Numerical Example 1 is shown in FIG. The same applies to Figures 4, 6, and 8, but Figure 2 (a
), the vertical axis is the incident height, and the upper end is the incident height of F/16. The horizontal axis represents vertical aberration, solid line d represents d-line spherical aberration, and broken line g represents g-line spherical aberration. In addition, in FIG. 2(b), the vertical axis is the half angle of view,
Its upper end has a half angle of view of 65.5°. The horizontal axis represents the image plane position, the solid line S indicates the sagittal image plane, and the dotted line M indicates the meridional image plane. Furthermore, in FIG. 2(c), the vertical axis is a half angle of view, and the upper end thereof is a half angle of view of 65.5°. The horizontal axis is distortion.
〈数値実施例2〉
r + = 16.23
cl + =0.9 n + =]、7]300
v 1=53.9r2=7.9
d2=5.5
r、=I8.5
d、=0.9
r4=5.O
d4 =4.262
r 5 = 51.15
d、=6.1
r 6= −10,44
d6=4.2
r 7 = −8,6]
d、=1.35
r8 = 4.44
da =3.42
r、 = −7,737
d9=0.1
r +o= Il、 25
d+o=2.88
r 、、= −22,58
dz=1−0
n 2 = 1.71300
n 3 = 1.78472
n a = 1.78472
n s =1.70030
n 6 = 1.71300
r 12= ■
d+2=0.7
n ? = 1.51680
r 13: l
ν 、=53.9
f=3.1OF/1.6 2 ω= 142゜ν
3=25.7
シ 4
25.7
シ 5
47.8
ν 6
53.9
ν 7−64゜2
そして、
f1□/f=−1,70
f ” (n4ni) / rs =0.059r
+o/ r + 、= −0,50ν3=25.7
である。<Numerical Example 2> r + = 16.23 cl + = 0.9 n + =], 7] 300
v 1=53.9r2=7.9 d2=5.5 r,=I8.5 d,=0.9 r4=5. O d4 = 4.262 r 5 = 51.15 d, = 6.1 r 6 = -10,44 d6 = 4.2 r 7 = -8, 6] d, = 1.35 r8 = 4.44 da =3.42 r, = -7,737 d9=0.1 r +o= Il, 25 d+o=2.88 r,, = -22,58 dz=1-0 n 2 = 1.71300 n 3 = 1 .78472 n a = 1.78472 n s = 1.70030 n 6 = 1.71300 r 12= ■ d+2=0.7 n? = 1.51680 r 13: l ν , = 53.9 f = 3.1OF/1.6 2 ω = 142゜ν
3=25.7 shi 4 25.7 shi 5 47.8 ν 6 53.9 ν 7-64゜2 And f1□/f=-1,70 f ” (n4ni) / rs =0.059r
+o/r + , = −0,50ν3=25.7.
前記数値実施例2のレンズ構成図を第3図に、また、そ
の数値実施例2の収差曲線図を第4図に示す。なお、第
4図(b) 、 (c)において、縦軸の上端は71
0の半画角である。FIG. 3 shows a lens configuration diagram of Numerical Example 2, and FIG. 4 shows an aberration curve diagram of Numerical Example 2. In addition, in Fig. 4(b) and (c), the upper end of the vertical axis is 71
This is a half angle of view of 0.
〈数値実施例3〉
r 1= 15.945
d+ =0.9 n+ =1.71300 1.’
I =53.9r2=冒
d2=6,0
r3=2fi、53
d3 =0.9 n2=I、71300 L)
2 = 53.9r4=5.0
d、=511
r 5 = 67.92
d、=7.O
r 6 =−11,753
d6=4.7
r、 = −61,5
d 7 =1.35
rs=4.25
d、=4.2
r9 =〜16.56
d9=0.1
r 、o= 11.’ls:1
d+o=3.5
rl+=−H,(1
dll=1.0
r 12= 艶
d12=0.7
−n3− ■
f=3.02
そして、
1.78472
n a = 1.80518
1.74330
n b = 1.7]300
n 7 = 1.5168(1
ν v=25.7
シ、=25.5
ν 、=49.2
シロ=53.9
シ、=64.2
F/1.6
2 ω=
153゜
f 12/ f =刊60
f ’ (n4 nq )/ rs =0
.044r 10/ r 11=−〇、41
ν 、=25.7
である。<Numerical Example 3> r 1 = 15.945 d+ = 0.9 n+ = 1.71300 1. '
I = 53.9r2 = d2 = 6,0 r3 = 2fi, 53 d3 = 0.9 n2 = I, 71300 L)
2 = 53.9r4 = 5.0 d, = 511 r 5 = 67.92 d, = 7. Or 6 = -11,753 d6 = 4.7 r, = -61,5 d 7 = 1.35 rs = 4.25 d, = 4.2 r9 = ~ 16.56 d9 = 0.1 r, o=11. 'ls:1 d+o=3.5 rl+=-H, (1 dll=1.0 r 12= luster d12=0.7 -n3- ■ f=3.02 and 1.78472 n a = 1.80518 1.74330 n b = 1.7] 300 n 7 = 1.5168 (1 ν v = 25.7 ci, = 25.5 ν , = 49.2 siro = 53.9 shi, = 64.2 F/ 1.6 2 ω = 153° f 12/ f = 60 f' (n4 nq)/ rs = 0
.. 044r 10/r 11=−〇, 41 ν,=25.7.
前記数値実施例3のレンズ構成図を第5図に、また、そ
の数値実施例3の収差曲線図を第6図に示す。なお、第
6図(b) 、 (c)において、縦軸の上端は76
.5°の半画角である。A lens configuration diagram of Numerical Example 3 is shown in FIG. 5, and an aberration curve diagram of Numerical Example 3 is shown in FIG. In addition, in Fig. 6(b) and (c), the upper end of the vertical axis is 76
.. It has a half angle of view of 5°.
〈数値実施例4〉
r + = 19.0267
d、 =0.9 ni =1.71300 v、
=53.9r2= 7.5695
d2=3.861
r3=30.0
d、=0.9 n2 =1.71300 1/2
=53.9r4= 4.7481
d4=5.0
r s ” 47.9971
ds =7.0 n3=1.78472 LJI
=25.7r 6 = −13,5216
d6=3.5
r 、=−105,6489
dt =IJ5 B4 ;l。80518
v4 =25.5r8 = 4.154
da−=4.2 B5 =1.74330
ν5 =49.2r 9 = −16,643
1
d9=o、1
rl。= 10.1762
d +o=2.5 B6 =1.71300
シロ=53.9r + + = −33,64
6
d、、=1.O
r 12” ■
d+□=0.7 n 7 =1.51680
シフ =64.2r 】3= ■
f=2.90 F/1.6 2 ω=
180゜そして、
f 12/ f = −1,66
f ’ (n4n 5) / r s =0.043
r、。/ r + 1= −0,30
ν 3=25.7
である。<Numerical Example 4> r + = 19.0267 d, = 0.9 ni = 1.71300 v,
=53.9r2=7.5695 d2=3.861 r3=30.0 d,=0.9 n2=1.71300 1/2
=53.9r4=4.7481 d4=5.0 r s ” 47.9971 ds =7.0 n3=1.78472 LJI
=25.7r6=-13,5216 d6=3.5r,=-105,6489 dt=IJ5B4;l. 80518
v4=25.5r8=4.154 da-=4.2 B5=1.74330
ν5 = 49.2r9 = -16,643
1 d9=o, 1 rl. = 10.1762 d + o = 2.5 B6 = 1.71300
White = 53.9r + + = -33,64
6 d,,=1. O r 12” ■ d+□=0.7 n 7 =1.51680
Schiff =64.2r]3= ■ f=2.90 F/1.6 2 ω=
180° and f 12/ f = -1,66 f' (n4n 5) / r s = 0.043
r. / r + 1 = −0,30 ν 3 = 25.7.
前記数値実施例4のレンズ構成図を第7図に、また、そ
の数値実施例4の収差曲線図を第8図に示す。なお、第
8図(b) 、 (c)において、縦軸の上端は90
’の半画角である。A lens configuration diagram of Numerical Example 4 is shown in FIG. 7, and an aberration curve diagram of Numerical Example 4 is shown in FIG. In addition, in Fig. 8(b) and (c), the upper end of the vertical axis is 90
' is the half angle of view.
なお、前記いずれの数値実施例の超広角レンズも、平行
平面板Cを無視した場合のバックフォーカスが、焦点距
離fの2.4倍以上になっている。In addition, in the ultra-wide-angle lenses of any of the numerical examples described above, the back focus when the parallel plane plate C is ignored is 2.4 times or more the focal length f.
前記実施例の構成によれば、構成枚数がわずか6枚であ
り、焦点距離fに比ベバックフォーカスが約2.5倍以
上で、画角が130°〜180°に及ぶにもかかわらず
、明るくかつ高性能なものにできる。これとともに、構
成枚数がきわめて少なく、かつ、レンズ全長が短く、コ
ンパクトで、しかも非球面を設けることもなく、低コス
トにできる。According to the configuration of the embodiment, the number of lenses is only 6, the back focus is about 2.5 times or more compared to the focal length f, and the angle of view ranges from 130° to 180°. It can be made bright and high-performance. In addition, the number of constituent lenses is extremely small, the total lens length is short, and the lens is compact, and there is no aspheric surface, making it possible to reduce costs.
本発明によれば、物体側から順に、物体側に凸面を向け
た2枚の負のメニスカスレンズと、正レンズと、接合さ
れた両凹レンズおよび両凸レンズと、正レンズとにより
構成された超広角レンズで、前述の条件(<) (
ol (l臼 (駒を満足させたことにより、焦
点距離に比ベバックフォーカスがきわめて長く、画角が
きわめて大きいにもかかわらず、コンパクトで、低コス
トで、しかも、明るく高性能な超広角レンズを提供する
ことができる。According to the present invention, an ultra-wide-angle lens is constructed of, in order from the object side, two negative meniscus lenses with convex surfaces facing the object side, a positive lens, a cemented biconcave lens and a biconvex lens, and a positive lens. With the lens, under the above conditions (<) (
ol (l mortar) By satisfying the frame, the back focus is extremely long compared to the focal length, and the angle of view is extremely large, yet it is compact, low cost, bright, and high performance ultra-wide-angle lens. can be provided.
図面は本発明の超広角レンズの実施例を示すもので、第
1図は数値実施例1のレンズ構成図、第2図は数値実施
例1の収差曲線図、第3図は数値実施例2のレンズ構成
図、第4図は数値実施例2の収差曲線図、第5図は数値
実施例3のレンズ構成図、第6図は数値実施例3の収差
曲線図、第7図は数値実施例4のレンズ構成図、第8図
は数値実施例4の収差曲線図である。
A・・前群、B・・後群、A1・・負のメニスカスレン
ズ、A2・・負のメニスカスレンズ、A3・・正レンズ
、B1φ・両凹レンズ、B2・・両凸レンズ、B3・・
正レンズ。
Fハ、6
田、ダ
ω、5゜The drawings show examples of the ultra-wide-angle lens of the present invention. FIG. 1 is a lens configuration diagram of Numerical Example 1, FIG. 2 is an aberration curve diagram of Numerical Example 1, and FIG. 3 is Numerical Example 2. 4 is an aberration curve diagram of Numerical Example 2, FIG. 5 is a lens configuration diagram of Numerical Example 3, FIG. 6 is an aberration curve diagram of Numerical Example 3, and FIG. 7 is a numerical diagram of Numerical Example 3. A lens configuration diagram of Example 4 and FIG. 8 are aberration curve diagrams of Numerical Example 4. A: front group, B: rear group, A1: negative meniscus lens, A2: negative meniscus lens, A3: positive lens, B1φ: biconcave lens, B2: biconvex lens, B3...
Positive lens. Fha, 6 Ta, Daω, 5゜
Claims (1)
のメニスカスレンズと、物体側に凸面を向けた負のメニ
スカスレンズと、正レンズとの3枚のレンズからなり、 前記後群は、物体側から順に、接合された両凹レンズお
よび両凸レンズと、正レンズとの3枚のレンズからなり
、 かつ、次の(イ)、(ロ)、(ハ)、(ニ)の条件を満
たすことを特徴とする超広角レンズ。 (イ)−1.75<f_1_2/f<−1.55(ロ)
0.04<f・(n_4−n_5)/R_4′<0.0
65(ハ)−0.55<R_6/R_6′<−0.25
(ニ)ν_3<30 ただし、ここで、 f_1_2は、物体側から1番目および2番目のレンズ
の合成焦点距離、 fは、全系の焦点距離、 n_i(i=4、5)は、物体側からi番目のレンズの
屈折率、 R_i′(i=4、6)は、物体側からi番目のレンズ
の像側の面の曲率半径、 R_6は、物体側から6番目のレンズの物体側の面の曲
率半径、 ν_3は、物体側から3番目のレンズのアッベ数 である。(1) In order from the object side, the front group is divided into a front group and a rear group. The rear group consists of three lenses: a meniscus lens and a positive lens, and the rear group consists of three lenses, in order from the object side, a cemented biconcave lens, a biconvex lens, and a positive lens, and: An ultra-wide-angle lens that satisfies conditions (a), (b), (c), and (d). (a) -1.75<f_1_2/f<-1.55 (b)
0.04<f・(n_4-n_5)/R_4'<0.0
65(c)-0.55<R_6/R_6'<-0.25
(d) ν_3<30 However, here, f_1_2 is the combined focal length of the first and second lenses from the object side, f is the focal length of the entire system, and n_i (i=4, 5) is the object side. R_i' (i=4, 6) is the radius of curvature of the image-side surface of the i-th lens from the object side, R_6 is the object-side surface of the 6th lens from the object side. The radius of curvature of the surface, ν_3, is the Abbe number of the third lens from the object side.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2181182A JP2992547B2 (en) | 1990-07-09 | 1990-07-09 | Super wide angle lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2181182A JP2992547B2 (en) | 1990-07-09 | 1990-07-09 | Super wide angle lens |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0468307A true JPH0468307A (en) | 1992-03-04 |
JP2992547B2 JP2992547B2 (en) | 1999-12-20 |
Family
ID=16096306
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2181182A Expired - Lifetime JP2992547B2 (en) | 1990-07-09 | 1990-07-09 | Super wide angle lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2992547B2 (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006284620A (en) * | 2005-03-31 | 2006-10-19 | Nidec Nissin Corp | Wide angle lens and cemented lens |
EP1830211A1 (en) * | 2006-03-02 | 2007-09-05 | Alps Electric Co., Ltd. | Optical device |
WO2007120370A1 (en) * | 2006-04-10 | 2007-10-25 | Alex Ning | Ultra-wide angle objective lens |
US7301578B2 (en) | 2004-02-09 | 2007-11-27 | Konica Minolta Opto, Inc. | Super-wide-angle optical system and image pickup device |
WO2009020195A1 (en) * | 2007-08-07 | 2009-02-12 | Nikon Corporation | Wide angle lens and image picking-up device provided with this wide angle lens |
US7502180B2 (en) | 2006-12-22 | 2009-03-10 | Olympus Imaging Corp. | Image-formation optical system and imaging system using the same |
US7633688B2 (en) | 2005-06-01 | 2009-12-15 | Olympus Imaging Corp. | Image forming optical system |
JP2013040992A (en) * | 2011-08-11 | 2013-02-28 | Pentax Ricoh Imaging Co Ltd | Super-wide angle lens system |
WO2016024411A1 (en) * | 2014-08-11 | 2016-02-18 | 株式会社ニコン | Optical system, imaging device provided therewith, and method for manufacturing optical system |
CN106443976A (en) * | 2016-12-24 | 2017-02-22 | 广东弘景光电科技股份有限公司 | Large aperture high definition optical system and lens for use thereof |
US10754474B2 (en) | 2016-11-21 | 2020-08-25 | Seiko Epson Corporation | Projector system |
CN113433662A (en) * | 2021-06-30 | 2021-09-24 | 天津欧菲光电有限公司 | Imaging system, lens module, electronic equipment and carrier |
CN114063262A (en) * | 2021-12-15 | 2022-02-18 | 厦门力鼎光电股份有限公司 | Positive distortion fisheye lens |
-
1990
- 1990-07-09 JP JP2181182A patent/JP2992547B2/en not_active Expired - Lifetime
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7301578B2 (en) | 2004-02-09 | 2007-11-27 | Konica Minolta Opto, Inc. | Super-wide-angle optical system and image pickup device |
JP2006284620A (en) * | 2005-03-31 | 2006-10-19 | Nidec Nissin Corp | Wide angle lens and cemented lens |
US7633688B2 (en) | 2005-06-01 | 2009-12-15 | Olympus Imaging Corp. | Image forming optical system |
US7298561B1 (en) | 2006-03-02 | 2007-11-20 | Alps Electric Co., Ltd. | Optical device |
EP1830211A1 (en) * | 2006-03-02 | 2007-09-05 | Alps Electric Co., Ltd. | Optical device |
WO2007120370A1 (en) * | 2006-04-10 | 2007-10-25 | Alex Ning | Ultra-wide angle objective lens |
US7502180B2 (en) | 2006-12-22 | 2009-03-10 | Olympus Imaging Corp. | Image-formation optical system and imaging system using the same |
US8237842B2 (en) | 2007-08-07 | 2012-08-07 | Nikon Corporation | Wide-angle lens and imaging apparatus equipped therewith |
JP2009042377A (en) * | 2007-08-07 | 2009-02-26 | Nikon Corp | Wide angle lens and imaging apparatus having wide angle lens |
WO2009020195A1 (en) * | 2007-08-07 | 2009-02-12 | Nikon Corporation | Wide angle lens and image picking-up device provided with this wide angle lens |
JP2013040992A (en) * | 2011-08-11 | 2013-02-28 | Pentax Ricoh Imaging Co Ltd | Super-wide angle lens system |
US8659841B2 (en) | 2011-08-11 | 2014-02-25 | Pentax Ricoh Imaging Company, Ltd. | Superwide-angle lens system |
WO2016024411A1 (en) * | 2014-08-11 | 2016-02-18 | 株式会社ニコン | Optical system, imaging device provided therewith, and method for manufacturing optical system |
US10754474B2 (en) | 2016-11-21 | 2020-08-25 | Seiko Epson Corporation | Projector system |
CN106443976A (en) * | 2016-12-24 | 2017-02-22 | 广东弘景光电科技股份有限公司 | Large aperture high definition optical system and lens for use thereof |
CN113433662A (en) * | 2021-06-30 | 2021-09-24 | 天津欧菲光电有限公司 | Imaging system, lens module, electronic equipment and carrier |
CN113433662B (en) * | 2021-06-30 | 2022-08-09 | 天津欧菲光电有限公司 | Imaging system, lens module, electronic equipment and carrier |
CN114063262A (en) * | 2021-12-15 | 2022-02-18 | 厦门力鼎光电股份有限公司 | Positive distortion fisheye lens |
Also Published As
Publication number | Publication date |
---|---|
JP2992547B2 (en) | 1999-12-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6844991B2 (en) | Fisheye lens | |
JP3200925B2 (en) | Zoom lens with wide angle of view | |
JPH0943512A (en) | Photographic lens | |
JP2008112000A (en) | Zoom lens | |
JPS61213817A (en) | Zoom finder | |
JPH0468307A (en) | Super-wide-angle lens | |
CN108780213B (en) | Zoom lens and imaging device | |
JP2001272602A (en) | Zoom lens and optical equipment using the same | |
JPH04146407A (en) | High variable power zoom lens | |
JPH03158817A (en) | Variable power lens | |
JPH07270681A (en) | Photographic lens | |
JP2014021329A (en) | Optical system, optical device and manufacturing method of optical system | |
JP2004061681A (en) | Zoom lens and optical equipment with same | |
JPH07168095A (en) | Triplet lens | |
JP3033148B2 (en) | Compact zoom lens | |
JP4659412B2 (en) | Zoom lens and image projection apparatus having the same | |
JP4453120B2 (en) | Zoom lens | |
JP3506796B2 (en) | Real image type zoom finder | |
JP3008926B2 (en) | Fish icon barter and photographing lens system equipped with the fish icon barter | |
JPH09218350A (en) | Retrofocus type lens | |
JPH0933802A (en) | Wide-angle lens | |
JPS63199312A (en) | Compact lens system | |
JP3744042B2 (en) | Zoom lens | |
JPH02201409A (en) | Rear focus type zoom lens | |
JPH02248910A (en) | Fish-eye lens |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101022 Year of fee payment: 11 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101022 Year of fee payment: 11 |
|
R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
R360 | Written notification for declining of transfer of rights |
Free format text: JAPANESE INTERMEDIATE CODE: R360 |
|
R371 | Transfer withdrawn |
Free format text: JAPANESE INTERMEDIATE CODE: R371 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101022 Year of fee payment: 11 |
|
S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313113 |
|
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101022 Year of fee payment: 11 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101022 Year of fee payment: 11 |