JPS63199312A - Compact lens system - Google Patents
Compact lens systemInfo
- Publication number
- JPS63199312A JPS63199312A JP3137087A JP3137087A JPS63199312A JP S63199312 A JPS63199312 A JP S63199312A JP 3137087 A JP3137087 A JP 3137087A JP 3137087 A JP3137087 A JP 3137087A JP S63199312 A JPS63199312 A JP S63199312A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens system
- focal length
- camera
- condition
- 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.)
- Pending
Links
- 230000005499 meniscus Effects 0.000 claims abstract description 7
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000004075 alteration Effects 0.000 abstract description 27
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 206010010071 Coma Diseases 0.000 description 3
- 201000009310 astigmatism Diseases 0.000 description 2
- 239000011521 glass Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- -1 silver halide Chemical class 0.000 description 1
Landscapes
- Lenses (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、ビデオカメラ用またはコンパクトカメラタイ
プの電子スチルカメラ用のレンズ系に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lens system for a video camera or a compact camera type electronic still camera.
ビデオカメラおよび電子スチルカメラは、３５關銀塩フ
イルムカメラに比べて画面サイズが非常に小さいためレ
ンズ系の焦点距離が全般的に短い。Video cameras and electronic still cameras have much smaller screen sizes than 35mm silver halide film cameras, so the focal length of their lens systems is generally shorter.
それにしたがってレンズ系のバックフォーカスも短くな
る傾向にある。Accordingly, the back focus of lens systems also tends to become shorter.
ビデオカメラおよびコンパクトカメラタイプの電子スチ
、ルカメラは、不デインダー系永光を□導く光路分割鏡
の必要がないために、−眼レフ式のレンズ系に比べてバ
ックフォーカスは短くともよいが、それでも光学的ロー
パスフィルターなどの光学部材を配“置するので、その
ための空間をある程度確保しなければならない。画角（
２ω）が５０°程度のレンズ系で、−インチから１イン
チサイズの撮像素子を考えると、焦点距離は８朋〜１１
ｆｎｍ程度になシ、光学的ローパスフィルターなどを配
置する空間を確保するためには、焦点距離の０．７〜１
゜１倍程度のバックフォーカスが必要になる。Electronic still cameras such as video cameras and compact cameras do not require optical path splitting mirrors to guide non-deadder permanent light. Since optical components such as a low-pass filter are placed in the camera, a certain amount of space must be secured for them.The angle of view (
2ω) is about 50°, and considering an image sensor with a size of -inch to 1 inch, the focal length is 8 to 11 mm.
fnm, and in order to secure space for placing an optical low-pass filter, etc., the focal length must be 0.7 to 1.
A back focus of about 1x is required.
従来知られているビデオカメラあるいはコンパクトカメ
ラタイプの電子スチルカメレ用の単焦点レンズとしては
特開昭６０−２３９７０５号公報に記載されたものがあ
る。しかし画角（２ω）が４３゜と狭いレンズ系である
。又バックフォーカスも焦点距離の０．６５倍と短い。A conventional single focus lens for a video camera or a compact camera type electronic still camera is described in Japanese Patent Laid-Open No. 60-239705. However, it is a lens system with a narrow angle of view (2ω) of 43°. The back focus is also short at 0.65 times the focal length.
更に正のメニスカスの第１群レンズと９両凹レンズの第
２群レンズと、正レンズの第３群レンズと、正のメニス
カスの第４群レンズと、平行平面フィルターとにて構成
されるレンズ系のうちの第４群レンズの像側の面が像側
に凹面を向けているために実質上のバックフォーカスは
更に短くなっている。A lens system further includes a first group lens with a positive meniscus, a second group lens with 9 biconcave lenses, a third group lens with a positive lens, a fourth group lens with a positive meniscus, and a parallel plane filter. Since the image side surface of the fourth group lens has a concave surface facing the image side, the actual back focus is further shortened.
本発明が解決しようとする問題点は、画角（２ω）が５
０°程度であって、口径比が１．６〜２．０程度であり
、全系の焦点距離の０．７〜１．１倍程度のバックフォ
ーカスを持つビデオカメラ用または電子スチルカメラ用
のレンズ系を提供することにある。The problem to be solved by the present invention is that the angle of view (2ω) is 5
For video cameras or electronic still cameras, the angle is about 0°, the aperture ratio is about 1.6 to 2.0, and the back focus is about 0.7 to 1.1 times the focal length of the entire system. Our objective is to provide lens systems.
コンパクトなレンズ系として古くから知られているもの
にトリプレット型レンズがあり３枚構成の簡単なもので
ありながら各収差とも良好に補正されたレンズ系を実現
することが出来る。しかし本発明の目的を達成するため
には、このトリプレット型レンズを用いるとバックフォ
ーカスヲ長くとるために第３群レンズの光線高が高く々
す、第３群レンズの分担するパワーも大きくなる上５．
６〜喝のように大口径にすることもあって球面収差をは
じめとして非点収差、コマ収差など主に第３群レンズに
て発生する収差を良好に補正することが困難になる。A triplet lens has long been known as a compact lens system, and although it is a simple three-element lens system, it is possible to realize a lens system in which each aberration is well corrected. However, in order to achieve the purpose of the present invention, if this triplet type lens is used, the ray height of the third group lens must be high because the back focus is long, and the power shared by the third group lens will also be large. 5.
Due to the large aperture of lenses such as those shown in lenses 6 to 6, it becomes difficult to satisfactorily correct aberrations mainly occurring in the third group lens, such as spherical aberration, astigmatism, and coma.
したがって本発明ではトリプレット型レンズ系の第３群
レンズを２枚のレンズに分割した逆エルノスター型のレ
ンズ系を採用した。即ち本発明のレン〉系は、物体側よ
り順に両凸レンズの第１レンズと、両凹レンズの第２レ
ンズと、像側に凸面を向けた正のメニスカスレンズの第
３レンズと、像−側に凸面を有する正レンズの第４レン
ズとより構成され次の諸条件を満足することを更に満足
するものである。Therefore, in the present invention, an inverted Ernostar type lens system is adopted in which the third lens group of the triplet type lens system is divided into two lenses. That is, the lens system of the present invention includes, in order from the object side, a first lens that is a biconvex lens, a second lens that is a biconcave lens, a third lens that is a positive meniscus lens with a convex surface facing the image side, and a lens that is a positive meniscus lens with a convex surface facing the image side. The fourth lens is a positive lens having a convex surface, and further satisfies the following conditions.
（１） ０．７ ＜ｌｆｌ当＜ ７．０（２） ０
．４ ＜ ｆ：／ｆ、 ＜ ２．２（３） ０．３＜
２Ｆ／＜１，０（４） １．０ ＜ ｒ２Ｒ／
＜ ５．０（５） ν１〈４５
ただしｆは全系の焦点距離、ｆ１２は第１．第２レンズ
の合成焦点距離、ｆ３は第３レンズの焦点距離、ｆ４は
第４レンズの焦点距離、ｒ２Ｆは第２レンズの物体側の
面の曲率半径、ｒ２Ｒは第２レンズの像側の面の曲率半
径、ν１は第１レンズのアツベ数である。(1) 0.7 <lfl< 7.0 (2) 0
．． 4 < f:/f, < 2.2 (3) 0.3 <
2F/<1,0(4) 1.0<r2R/
<5.0(5) ν1<45 where f is the focal length of the entire system, and f12 is the 1st. The combined focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, r2F is the radius of curvature of the object side surface of the second lens, and r2R is the image side surface of the second lens. The radius of curvature of ν1 is the Abbe number of the first lens.
条件（１）と条件（２）は、本発明のレンズ系の基本的
なパワー配置を規定したものである。条件（１）は、バ
ックフォ−カスを確保するために必要な条件で、この条
件の上限を越えると所望のバックフォーカスを確保する
ことが出来なくなシ又下限を越えるとバックフォーカス
を確保する上では有利であるが歪曲収差が負の過大な値
になり好ましくない。Conditions (1) and (2) define the basic power arrangement of the lens system of the present invention. Condition (1) is a condition necessary to secure the back focus; if the upper limit of this condition is exceeded, it will not be possible to secure the desired back focus, and if the lower limit of this condition is exceeded, it will be difficult to secure the back focus. Although this is advantageous, the distortion becomes an excessively negative value, which is not preferable.
この条件（１）の範囲で光線を発散させた後に第３レン
ズと第４レンズで光線を収斂させる場合、条件（２）の
範囲を満足するようにすることが望ましい。When the light rays are diverged within the range of condition (1) and then converged by the third and fourth lenses, it is desirable to satisfy the range of condition (2).
この条件（２）は、第３レンズと第４レンズのパワー比
を規定したものであって、この条件の範囲内であれば光
線を無理なく収斂させることができ、各収差の発生を小
さく抑えることが出来る。条件（２）の下限を越えると
球面収差が大きく補正不足になリ、上限を越えると負の
歪曲収差が過大な値になり又倍率の色収差が補正不足に
なる。This condition (2) defines the power ratio of the third lens and the fourth lens, and within the range of this condition, the light rays can be converged without difficulty, and the occurrence of each aberration can be kept small. I can do it. When the lower limit of condition (2) is exceeded, spherical aberration becomes large and under-corrected, and when the upper limit is exceeded, negative distortion becomes excessively large and chromatic aberration of magnification becomes under-corrected.
これら条件（１）２条件（２）を満足した上で各収差を
良好に補正するためには、さらに条件（３）乃至条件（
５）を満足する必要がある。In order to satisfactorily correct each aberration while satisfying these conditions (1) and (2), conditions (3) to (2) must be further satisfied.
5) must be satisfied.
条件（３）は、球面収差とコマ収差および歪曲収差の補
正のために設けたもので条件（３）の下限を越えると球
面収差がオーバー側に倒れ、又コマ収差が増大する。条
件（３）の下限を越えなければ球面収差およびコマ収差
の補正は可能になるが条件（３）の上限を越えた場合に
は歪曲収差が負の過大な値になる。Condition (3) is provided to correct spherical aberration, coma aberration, and distortion aberration, and if the lower limit of condition (3) is exceeded, spherical aberration will fall to the over side and coma aberration will increase. If the lower limit of condition (3) is not exceeded, correction of spherical aberration and comatic aberration becomes possible, but if the upper limit of condition (3) is exceeded, distortion becomes an excessively negative value.
条件（４）は非点収差を補正するだめのものでこの条件
の上限を越えるとメリジオナル像面が大きくアンダー側
に倒れ又下限を越えると近距離にフォーカシングした時
にメリジオナル像面がオーバー側へ倒れ好ましくない。Condition (4) is for correcting astigmatism, and if the upper limit of this condition is exceeded, the meridional image plane will fall significantly to the under side, and if the lower limit is exceeded, the meridional image plane will fall to the over side when focusing at a short distance. Undesirable.
条件（５）は色収差を良好に補正するためのものでこの
条件を満足し々いと軸上色収差は補正できても倍率の色
収差の補正が困難になる。Condition (5) is for properly correcting chromatic aberration, and if this condition is fully satisfied, even if longitudinal chromatic aberration can be corrected, it becomes difficult to correct lateral chromatic aberration.
次に本発明のレンズ系のフォーカシングに関して述べる
。Next, focusing of the lens system of the present invention will be described.
レンズ系全体を繰シ出してフォーカシングを行なうのに
比べて、一部のレンズを動かしてフォーカシングを行な
う方が移動するレンズその他の重量が軽く、電気的にフ
ォーカシングを行なう場合にはフォーカシングの際の消
費電力量が少ガくてすむ上に絞シが固定になるのでレン
ズ鏡筒の機械的構成の単純化、小型化が可能になる。Compared to focusing by extending the entire lens system, moving a part of the lens for focusing reduces the weight of the moving lens and other parts. In addition to requiring less power consumption, the aperture is fixed, making it possible to simplify and downsize the mechanical structure of the lens barrel.
本発明のレンズ系において第４レンズのみを移動させて
フォーカシングを行なう場合には、更に次の条件を満足
することが望ましい。In the lens system of the present invention, when focusing is performed by moving only the fourth lens, it is desirable that the following conditions are further satisfied.
（６） −０，２＜ ｆ／ｆ、。３＜ ０．５（７）
０．７ ＜ ｆ４／ ＜ ２．０ただしｆ１□３は
第１レンズ、第２レンズ、第３レンズの合成焦点距離で
ある。(6) −0,2< f/f. 3<0.5(7)
0.7<f4/<2.0 where f1□3 is the combined focal length of the first lens, second lens, and third lens.
これら条件（６） 、 （７）は、長いバックフォーカ
スを確保したうえでリアーフォーカスが可能になるよう
にパワー配置を規定したものである。条件（６）又は条
件（７）の上限を越えた場合、フォーカシングのだめの
第４レンズの移動量が過大になシ、下限を越えた場合は
第４レンズのパワーが強くなシそれに応じて各レンズの
パワーも強くなるので各収差の補正が困難になる。These conditions (6) and (7) define the power arrangement so that long back focus is ensured and rear focus is possible. If the upper limit of condition (6) or condition (7) is exceeded, the amount of movement of the fourth lens for focusing will be excessive, and if the lower limit is exceeded, the power of the fourth lens will be changed accordingly. Since the power of the lens also increases, it becomes difficult to correct each aberration.
次に本発明のレンズ系の各実施例を示す。 Next, examples of the lens system of the present invention will be shown.
実施例１
ｆ＝１００ Ｆ／２．０ ２ω＝ ５３．８゜バ
ックフォーカス−〇、７ｆ
ｒｌ ＝９６．３１．９２
ｄ＋ ＝１１．．８１８２ ｎ＋ ＝１．８３４．Ｏ
ＯＩ／１ ＝３７．１６ｒ２： １０８２．２２８０
ｄ２＝６．５３１１
ｒ３−ω（絞シ）
ｄｓ＝１５．２２９７
ｒ４： ６３．６９７０
ａ４． ＝６．４１６０ ｎ２＝１．７６１８２
シ２＝２６．５５ｒ５＝１４７．１２７１
（Ｌ＋＝５．１７２３
ｒ６”” １２４．７１．９３
ｄａ””１４．５４２７ ｎ５＝１．７７２５０
シ３＝４９．６６ｒｑ＝ ５５．５２１１
ｄ７＝１４．５４５５
ｒａ＝１７６．９７００
ｄｇ＝１８．１８１８ ｎ＋””１．７７２５０
１’４＝４９．６６ｒｏ： １６９．７６４９
ｄｏ＝１８．１８１８
ｒ、０＝″
ｄ＋ｏ ＝６４．８１８２ ｎｓ ＝１．５１６３３
シ、＝５４．，１５ｒｌｌ””″
１ｆ１２ン−３，０４ｆ３／／ｆ４＝ １．０３ン ＝
０．３５ ”／／ｆ＝ １．．１５実施例２
ｆ＝１００ ｆ／ ２ω＝５３３゜２．０
バックフォーカス＝０．８６ｆ
ｒｌ ＝１３３．６４４４
ｄ＋ ＝１３．１５５２ １１＋ ＝１．．８５０２６
Ｊ’ｌ ＝３２．２８ｒ２＝ ２８３．０９８６
ｄ２”” ５．４７３２
ｒ３−ｃｏ（絞シ）
ｄ３＝１２．９５３５
ｒ４ ”” −４８−６３７４
ｄ＜ ＝８．１０３７ ｎ２＝１．７６１８２
Ｊ’２ ＝２６．５５ｒ５＝２１３．５１９０
ｄ５＝４．４８１５
ｒ６＝ １’３１．２００９
ｄ６＝１３．０１１０ ｎ５＝１．７７２５０
νｓ”４９．６６ｒ７ ＝ ５３．１３２９
ｄ？＝９．０９０９
ｒｇ ＝６９０７．３７０４
ｄａ−＝１７．７１４１ ｎ４ ＝１．７２０００
ｖ＋ ”５０．２５ｒ、＝ ８１．９６７１
ｄｏ”＝１８．１８１８
ｒｈｏ −■
ｄ＋ｏ ＝８８．６３６４ ｎｓ ＝１．５１６３３
ν５ ” ６４．１５ｒ１１ ＝″）
Ｉｆ＋２ンー１．６９ ｆｓ／ｆ、 ＝ ０．９６
一
実施例３
ｆ＝１００ ／ ２ω＝４８．１゜１．６
バックフォーカス＝０．７２ｆ
ｒ＋ ＝１０１．２７５９
ｄ＋ ＝１６．２４６８ ｎ＋ ”’１．８３４００
Ｊ’ｌ ”３７．１６ｒｚ＝ １１２７．８９７０
ｄ２＝９．７６４６
ｒ３−ω（絞シ）
ｄｓ ＝１６．８６９３
ｒ、：： ６２．８９１５
ｄ４”８．８８８９ ？１２＝１．８０５１８ Ｊ
’２””２５．４３ｒ５＝１４１．４７６０
ｄ５＝５．５５５６
ｒ６” １１３．６５９９
ｄａ”２０．３８９２ ｎｓ ＝１．７７２５０
νｓ ＝４９．６６ｒ７ ： ５７．０２８９
（ｈ ＝ ８．８８８９
ｒｇ＝１５２．５０５３
ｄｓ ＝２０．０ＯＯＯｎ４＝１．７７２５０ ７／４
＝４９．６６ｒ、＝−１５０，４１７８
ｄＱ＝２２．２２２２
ｒ＋ｏ＝″
ｄ＋ｏ ”５８．３３３３ ｎ５＝１．５１６３３
νｓ ＝ ６４．１５ｒ、、＝Ｃ０
１ｆ１２’／１ ＝ ２．６１ ｆｓ／１４＝ １．
２７ｆ／ ＝０．２３ ｆ４／＝１．０１実施例
４
ｆ＝１００ ／ ２ω＝ ５４．２゜１．６
バックフォーカス−〇、８１ ｆ
ｒ、＝１６２．７５７４
ｄ＋ ＝２８．３６９２ ｎｌ”＝１．８５０２６
νｔ”３２．２８ｒ２ニー４０６．８７７６
ｄ２＝６．４３８９
ｒ３＝の（絞り）
ｄ３＝１６．７５７１
ｒ４＝ −５０，９９１４
ｄ４＝１０．００００ ｎ２＝１．８’０５１８
ν２ ＝ ２５．４３ｒ５＝２７４．９６６４
ｄｉ ＝ ６．１８４５
ｒ６’： ４４１．６１６２
ｄａ””２０゜８５８０ ｎ３＝１．７７２５０
１／３ ”’４９．６６ｒフ ＝−５７，９０２７
ｄ７＝１０．ｏｏｏ。Example 1 f=100 F/2.0 2ω=53.8° Back focus -〇, 7f rl =96.31.92 d+ =11. ．． 8182 n+ =1.834. O
OI/1 =37.16r2: 1082.2280 d2=6.5311 r3-ω (diaphragm) ds=15.2297 r4: 63.6970 a4. =6.4160 n2=1.76182
shi2=26.55r5=147.1271 (L+=5.1723 r6"" 124.71.93 da""14.5427 n5=1.77250
C3=49.66rq=55.5211 d7=14.5455 ra=176.9700 dg=18.1818 n+””1.77250
1'4=49.66ro: 169.7649 do=18.1818 r, 0='' d+o =64.8182 ns =1.51633
C,=54. ,15rll""" 1f12n-3,04f3//f4= 1.03n =
0.35''//f=1..15 Example 2 f=100 f/ 2ω=533°2.0 Back focus=0.86f rl =133.6444 d+ =13.1552 11+ =1..85026
J'l =32.28r2= 283.0986 d2"" 5.4732 r3-co (diaphragm) d3=12.9535 r4 "" -48-6374 d< =8.1037 n2=1.76182
J'2 = 26.55r5 = 213.5190 d5 = 4.4815 r6 = 1'31.2009 d6 = 13.0110 n5 = 1.77250
νs”49.66r7 = 53.1329 d?=9.0909 rg =6907.3704 da-=17.7141 n4 =1.72000
v+ "50.25r, = 81.9671 do" = 18.1818 rho - ■ d+o = 88.6364 ns = 1.51633
ν5 ”64.15r11 =″) If+2-1.69 fs/f, = 0.96
Example 3 f = 100 / 2ω = 48.1° 1.6 Back focus = 0.72f r+ = 101.2759 d+ = 16.2468 n+ ”'1.83400
J'l ”37.16rz = 1127.8970 d2 = 9.7646 r3-ω (diaphragm) ds = 16.8693 r,:: 62.8915 d4”8.8889 ? 12=1.80518 J
'2""25.43r5=141.4760 d5=5.5556 r6"113.6599 da"20.3892 ns =1.77250
νs = 49.66r7: 57.0289 (h = 8.8889 rg = 152.5053 ds = 20.0OOOn4 = 1.77250 7/4
=49.66r, =-150,4178 dQ=22.2222 r+o=″d+o″58.3333 n5=1.51633
νs = 64.15r,,=C0 1f12'/1 = 2.61 fs/14=1.
27f/ = 0.23 f4/ = 1.01 Example 4 f = 100 / 2ω = 54.2° 1.6 Back focus -〇, 81 f r, = 162.7574 d+ = 28.3692 nl” = 1 .85026
νt"32.28r2 knee 406.8776 d2=6.4389 r3='s (aperture) d3=16.7571 r4= -50,9914 d4=10.0000 n2=1.8'0518
ν2 = 25.43r5=274.9664 di = 6.1845 r6': 441.6162 da""20°8580 n3=1.77250
1/3"'49.66rf = -57,9027 d7=10.ooo.
ｒａ＝２２３゜６９２８
ａｍ ＝２０．０Ｏ００ｎ＋ ＝１．７７２５０ １
’４ ＝４９．６６ｒｏ： ２０１．０８３６
ｄｏ＝２５．００００
ｒ＋ｏ＝ω
ｄ１ｏ＝６５．６２５０ ｎｓ”１．５１６３３
シ５＝＝５４．，１５ｒ、１ ＝＝（ｘ）
１ｆ１２ン−１，４２ｆｓ／−０，６０ｆ
、 ｆ＋
ｆ／＝ ０．３８ ｆ′／ｆ＝ １．４０実施例５
ｆ＝１００ Ｆ／ ２ω＝ ５３．６゜２．０
バックフォーカス−０，９３ｆ
ｒｌ”’１３０．３１４４
ｄ＋ ＝１７．５００Ｏｎ＋ ＝１．８４６６７ ９＋
＝２３．７８ｒ２＝ ３５２．３３５３
ｄ２＝７．５０００
ｒ３＝ｏｌ）（絞り）
ｄａ””１２．５０００
ｒ４： ５０．００００
ｄ＋−１０，００００ｎ２””１．８４６６７ Ｊ’
２ ＝２３．７８ｒ５ ＝１５４．８８５２
ｄ５二５．００００
ｒａ： １５１．５５２４
ｄ６＝２０．０ＯＯＯｎ３＝１．７７２５０ シ３
＝４９．６６ｒ７”’ ５５．３０３５
ｄ７二１０．００００
ｒｓ ””８９３．９８９１
ｄｓ ””３２．５０００ ｎ＋、 ””１．７７２
５０ １／４ ＝４９．６６ｒｏ” ８６．７９４
９
ｄ９＝２５．ｏｏｏｏ
ｒｌｏ”″
ｄ＋ｏ ”８４．３７５０ ｎ！Ｉ＝１．５１６３３
ν５”６４．１５ｒ、、＝ｃ。ra=223°6928 am =20.0O00n+ =1.77250 1
'4 =49.66ro: 201.0836 do=25.0000 r+o=ω d1o=65.6250 ns"1.51633
C5==54. ,15r,1 ==(x) 1f12n-1,42fs/-0,60f
, f+ f/= 0.38 f'/f= 1.40 Example 5 f=100 F/ 2ω= 53.6° 2.0 Back focus -0.93f rl'''130.3144 d+ =17.500On+ =1.84667 9+
=23.78r2= 352.3353 d2=7.5000 r3=ol) (aperture) da""12.5000 r4: 50.0000 d+-10,0000n2""1.84667 J'
2 =23.78r5 =154.8852 d525.0000 ra: 151.5524 d6=20.0OOOn3=1.77250 ci3
=49.66r7"' 55.3035 d7210.0000 rs ""893.9891 ds ""32.5000 n+, ""1.772
50 1/4 = 49.66ro” 86.794
9 d9=25. oooo rlo"" d+o "84.3750 n!I=1.51633
ν5”64.15r,,=c.
ｌｆ＋２１／−１，Ｉ Ｂ ｆ３／ｆ、 ＝ １．０
０し ＝ ０．０９ ｆ４／ ＝ １．０４ｆ
１２３
実施例６
ｆ＝１００Ｆ／２ω＝５４．１゜
２．０
バックフォーカス＝１．０６ｆ
ｒｌ ＝２８６．９７０１
ｄ＋＝１３．３３５９ １１＋”１．８４６６６ １／
＋”２３．８８ｒ２＝ １７９．５６７８
ｄ２＝８．１６５３
ｒ３”の（絞り）
ｄｓ−”１４，２９８２
ｒ、＝ ４１．７９５３
ｄ＋ ”１１．６７７５ ｎ２””１．８０５１８
シ２＝２５．４３ｒ５＝２７１．３５２４
ｄ、＝６．１３２０
ｒ６” １６８．０８８０
ｄａ”２０．７４９４ ｎｓ”１．６９６８０ １／
３＝５５．５２ｒｔ＝ ５０．３０１９
ｃｌｙ””１０．００００
ｒｓ＝３７９．２１５５
ｄａ ””２２．５０００ ｎ４− ”１．６９６８
０ ν４． ” ５５．５２ｒｏ” １０３．０００
３
ｄ９＝２５．ｏｏｏ。lf+21/-1, I B f3/f, = 1.0
0 = 0.09 f4/ = 1.04f
123 Example 6 f=100F/2ω=54.1°2.0 Back focus=1.06f rl =286.9701 d+=13.3359 11+”1.84666 1/
+"23.88r2= 179.5678 d2=8.1653 r3" (aperture) ds-"14,2982 r, = 41.7953 d+"11.6775 n2""1.80518
shi2=25.43r5=271.3524 d,=6.1320 r6” 168.0880 da”20.7494 ns”1.69680 1/
3=55.52rt= 50.3019 cly""10.0000 rs=379.2155 da ""22.5000 n4- "1.6968
0 ν4. "55.52ro" 103.000
3 d9=25. ooooo.
ｒ＋ｏ＝″
ｄ＋ｏ ＝１０３．１２５Ｏｎ５＝１．５１６３３
シ１＝６４．１５ｒ、、 ＝＝ＣＯ
”１２’／ ＝ ０．９５ ／／ｆ、 ＝ ０．８
１ｆ／＝ ０．０８５ ｆ４／、、 ＝ １．１９
ｆ １２３
ただしｒｌ ＋ ｒ２ ＋・・、ｒｌ、はレンズ各面の
曲率半径、ｄ＋ ＋ ｄ２＋・ 、ｄ＋ｏは各レンズの
肉厚および空気間隔、ｎｌ ！ ｎ２ ＋・・、 ｎｉ
は各レンズの屈折率、シ１．シ２．・・・、シ、ハ各レ
ンズのアツベ数である。r+o=″d+o=103.125On5=1.51633
C1=64.15r,, ==CO "12'/ = 0.95 //f, = 0.8
1f/= 0.085 f4/,, = 1.19
f 123 where rl + r2 +..., rl is the radius of curvature of each lens surface, d+ + d2+..., d+o is the wall thickness and air spacing of each lens, nl! n2 +..., ni
is the refractive index of each lens, and C1. C2. ..., C, and C are the Atsube numbers of each lens.
上記の各実施例は第１図に示すよう々レンズ構成であっ
て、最も像側に配置しである面ｒ１゜、ｒｌｌをもつガ
ラスブロックは、光学的ローノくスフイルター等の光学
部材を配置することを想定して示しである。又これら実
施例では、第４レンズによりフォーカシングを行なうも
ので、例えば実施例においては空気間隔ｄ７を１４．５
４５５から２．４０９１に変化させて至近距離にフォー
カシングする。Each of the above embodiments has a lens configuration as shown in FIG. 1, and a glass block having surfaces r1° and rll disposed closest to the image side is used for disposing optical members such as an optical filter. This is shown assuming that you will do so. Further, in these embodiments, focusing is performed by the fourth lens, and for example, in the embodiments, the air distance d7 is 14.5.
Change from 455 to 2.4091 to focus at close range.
これら実施例の収差状況は第２図〜第８図に示しである
。そのうち第２図は実施例１の無限遠における収差曲線
図、第３図は実施例１の至近距離（結像倍率０１１１倍
）での収差曲線図である。The aberration situations of these examples are shown in FIGS. 2 to 8. Of these, FIG. 2 is an aberration curve diagram at infinity for Example 1, and FIG. 3 is an aberration curve diagram at close distance (imaging magnification 0111 times) for Example 1.
又第４図乃至第８図は夫々実施例２乃至実施例６の無限
遠における収差曲線図である。4 to 8 are aberration curve diagrams at infinity for Examples 2 to 6, respectively.
本発明のレンズ系は、構成枚数４枚の簡単な構成であシ
ながら画角（２ω）が５０°程度２口径比が１．６＝２
０程度であり全系の焦点距離の０．７〜１．１倍程度の
バックフォーカスを持ち、しかもリアフォーカスが可能
々ビデオカメラ用またはコンパクトタイプの電子スチル
カメラ用レンズであって各収差とも良好に補正されたも
のである。Although the lens system of the present invention has a simple configuration with four lenses, the angle of view (2ω) is approximately 50°, and the aperture ratio of 2 is 1.6 = 2.
It has a back focus of about 0.7 to 1.1 times the focal length of the entire system, and rear focus is possible.It is a lens for video cameras or compact electronic still cameras, and has good aberrations. It has been corrected.
第１図は本発明のレンズ系の断面図、第２図。
第３図は本発明の実施例１の収差曲線図、第４図乃至第
８図は夫々本発明の実施例２乃至実施例６の収差曲線図
である。FIG. 1 is a sectional view of the lens system of the present invention, and FIG. 2 is a sectional view of the lens system of the present invention. FIG. 3 is an aberration curve diagram of Example 1 of the present invention, and FIGS. 4 to 8 are aberration curve diagrams of Examples 2 to 6 of the present invention, respectively.
Claims (1)
レンズの第２レンズと、像側に凸面を向けた正のメニス
カスレンズの第３レンズと、像側に凸面を有する正レン
ズの第４レンズとから構成され次の各条件を満足するコ
ンパクトなレンズ系。 （１）０．７＜｜ｆ＿１＿２｜／ｆ＜７．０（２）０．
４＜ｆ＿３／ｆ＿４＜２．２ （３）０．３＜｜ｒ＿２＿Ｆ｜／ｆ＜１．０（４）１．
０＜ｒ＿２＿Ｒ／ｆ／５．０ （５）ν＿１＜４５ ただしｆは全系の焦点距離、ｆ＿１＿２は第１レンズと
第２レンズの合成焦点距離、ｆ＿３は第３レンズの焦点
距離、ｆ＿４は第４レンズの焦点距離、ｒ＿２＿Ｆ，ｒ
＿２＿Ｆは第２レンズの物体側の面および像側の面の曲
率半径、ν＿１は第１レンズのアッベ数である。 （２）第４レンズを光軸に沿って移動させることにより
フォーカシングを行なうレンズ系で、次の条件を更に満
足する特許請求の範囲（１）のコンパクトなレンズ系。 （６）−０．２＜ｆ／ｆ＿１＿２＿３＜０．５（７）０
．７＜ｆ＿４／ｆ＜２．０ ただしｆ＿１＿２＿３は第１レンズ、第２レンズ、第３
レンズの合成焦点距離である。[Claims] (1) In order from the object side: a first lens that is a biconvex lens, a second lens that is a biconcave lens, a third lens that is a positive meniscus lens with a convex surface facing the image side, and a third lens that is a positive meniscus lens with a convex surface facing the image side. and a fourth positive lens having a positive lens system, the compact lens system satisfies the following conditions. (1) 0.7<|f_1_2|/f<7.0(2)0.
4<f_3/f_4<2.2 (3) 0.3<|r_2_F|/f<1.0 (4) 1.
0<r_2_R/f/5.0 (5) ν_1<45 where f is the focal length of the entire system, f_1_2 is the combined focal length of the first and second lenses, f_3 is the focal length of the third lens, and f_4 is the focal length of the third lens. Focal length of 4 lenses, r_2_F, r
_2_F is the radius of curvature of the object-side surface and image-side surface of the second lens, and ν_1 is the Abbe number of the first lens. (2) A compact lens system according to claim (1), which is a lens system that performs focusing by moving the fourth lens along the optical axis, and further satisfies the following conditions. (6) −0.2<f/f_1_2_3<0.5(7)0
．． 7<f_4/f<2.0 However, f_1_2_3 is the first lens, second lens, and third lens.
This is the combined focal length of the lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3137087A JPS63199312A (en) | 1987-02-16 | 1987-02-16 | Compact lens system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3137087A JPS63199312A (en) | 1987-02-16 | 1987-02-16 | Compact lens system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63199312A true JPS63199312A (en) | 1988-08-17 |
Family
ID=12329367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3137087A Pending JPS63199312A (en) | 1987-02-16 | 1987-02-16 | Compact lens system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63199312A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09258100A (en) * | 1996-03-19 | 1997-10-03 | Asahi Optical Co Ltd | Photographing lens system |
| JP2005025174A (en) * | 2003-06-11 | 2005-01-27 | Olympus Corp | Imaging optical system and electronic apparatus using the same |
| US6850279B1 (en) | 1996-06-18 | 2005-02-01 | Sony Corporation | Optical image recording system, and associated processing system |
| JP2005316185A (en) * | 2004-04-28 | 2005-11-10 | Canon Inc | Photographic lens and imaging device having the same |
| US7206143B2 (en) | 2003-05-13 | 2007-04-17 | Olympus Corporation | Image-formation optical system, and imaging system incorporating the same |
| CN100460920C (en) * | 1996-06-18 | 2009-02-11 | 索尼株式会社 | Optical image recording system, and associated processing system |
| US10466442B2 (en) | 2017-12-08 | 2019-11-05 | Largan Precision Co., Ltd. | Lens system, projection device, detecting module and electronic device |
-
1987
- 1987-02-16 JP JP3137087A patent/JPS63199312A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09258100A (en) * | 1996-03-19 | 1997-10-03 | Asahi Optical Co Ltd | Photographing lens system |
| US6850279B1 (en) | 1996-06-18 | 2005-02-01 | Sony Corporation | Optical image recording system, and associated processing system |
| CN100460920C (en) * | 1996-06-18 | 2009-02-11 | 索尼株式会社 | Optical image recording system, and associated processing system |
| US7554597B2 (en) | 1996-06-18 | 2009-06-30 | Sony Corporation | Optical image recording system, and associated processing system |
| US7206143B2 (en) | 2003-05-13 | 2007-04-17 | Olympus Corporation | Image-formation optical system, and imaging system incorporating the same |
| JP2005025174A (en) * | 2003-06-11 | 2005-01-27 | Olympus Corp | Imaging optical system and electronic apparatus using the same |
| JP4712318B2 (en) * | 2003-06-11 | 2011-06-29 | オリンパス株式会社 | Imaging optical system and electronic apparatus using the same |
| JP2005316185A (en) * | 2004-04-28 | 2005-11-10 | Canon Inc | Photographic lens and imaging device having the same |
| JP4566614B2 (en) * | 2004-04-28 | 2010-10-20 | キヤノン株式会社 | Imaging lens and imaging apparatus having the same |
| US10466442B2 (en) | 2017-12-08 | 2019-11-05 | Largan Precision Co., Ltd. | Lens system, projection device, detecting module and electronic device |
| US10955643B2 (en) | 2017-12-08 | 2021-03-23 | Largan Precision Co., Ltd. | Electronic device with projection device, detecting module and lens system |
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