JP3181944B2 - Copier lens - Google Patents
Copier lensInfo
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- JP3181944B2 JP3181944B2 JP26371391A JP26371391A JP3181944B2 JP 3181944 B2 JP3181944 B2 JP 3181944B2 JP 26371391 A JP26371391 A JP 26371391A JP 26371391 A JP26371391 A JP 26371391A JP 3181944 B2 JP3181944 B2 JP 3181944B2
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Description
【０００１】[0001]
【産業上の利用分野】この発明は、複写機用レンズに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens for a copying machine.
【０００２】[0002]
【従来の技術】複写機の小型化に伴い、複写機用レンズ
にもコンパクト化、低コスト化、軽量化の要請があり、
これらの要請に沿う複写機用レンズとして、４群４枚構
成で完全対称型のものが知られている。しかし、この複
写機用レンズはレンズ枚数が４枚と少ないうえに、完全
対称型であるため設計に使用できるパラメーター数が少
なく、諸収差を良好に補正しようとすると、広画角化、
大口径化が困難となる問題がある。2. Description of the Related Art With the miniaturization of copiers, there has been a demand for compact, low-cost and light-weight copier lenses.
As a lens for a copying machine that meets these requirements, a completely symmetrical lens having a four-group, four-element configuration is known. However, this copier lens has a small number of four lenses, and since it is a perfect symmetric type, the number of parameters that can be used for design is small.
There is a problem that it is difficult to increase the diameter.
【０００３】一方、４群構成で非対称型の複写機用レン
ズとしては、特公昭６０−５１０９１号公報開示のもの
が知られているが、このレンズは「変倍時の性能向上」
を目的として非対称化が行われており、このためＦ／Ｎ
ｏ：５．６で半画角：１９度であり、大口径化・広画角
化は必ずしも十分でない。On the other hand, as an asymmetrical type copying machine lens having a four-group configuration, a lens disclosed in Japanese Patent Publication No. Sho 60-51091 is known.
Has been performed for the purpose of F / N
o: 5.6 and the half angle of view: 19 degrees, and enlargement of the aperture and widening of the angle of view are not always sufficient.
【０００４】[0004]
【発明が解決しようとする課題】この発明は、上記の如
き問題を解決するべくなされたものであって、４枚構成
と構成枚数が少なく、広画角・大口径の複写機用レンズ
の提供を目的とする。SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and provides a lens for a copying machine having a four-element structure, a small number of elements, and a wide angle of view and a large aperture. With the goal.
【０００５】[0005]
【課題を解決するための手段】この発明の複写機用レン
ズは、図１に示すように、物体側（図１、左方）から像
側（図１、右方）へ向かって順次、第１レンズ１，第２
レンズ２，第３レンズ３，第４レンズ４を配してなり、
第１レンズ１は正レンズ、第２レンズ２は負レンズ、第
３レンズ３は両凹レンズ、第４レンズ４は両凸レンズで
ある。As shown in FIG. 1, a lens for a copying machine according to the present invention sequentially moves from an object side (FIG. 1, left side) to an image side (FIG. 1, right side). 1 lens, 2nd
Lens 2, third lens 3, and fourth lens 4,
The first lens 1 is a positive lens, the second lens 2 is a negative lens, the third lens 3 is a biconcave lens, and the fourth lens 4 is a biconvex lens.
【０００６】レンズ構成は、図１に示すように、第１レ
ンズ１と第２レンズ２とを接合した３群４枚構成であ
る。As shown in FIG. 1, the lens configuration is a three-group, four-lens configuration in which a first lens 1 and a second lens 2 are joined.
【０００７】全系の合成焦点距離をｆ、第１，第２レン
ズの合成焦点距離をｆ１，２、第３レンズの物体側レン
ズ面の曲率半径をＲ３，１、像側レンズ面の曲率半径を
Ｒ３，２とするとき、これらは、条件 （１−１）０．５ｆ＜ｆ１，２＜１．０ｆ （１−２）１．０＜｜Ｒ３，１／Ｒ３，２｜＜１．９ を満足する。条件（１−２）から明らかなように、第３
レンズの各レンズ面の曲率半径を比較すると、物体側レ
ンズ面の曲率半径の絶対値が像側レンズ面の曲率半径よ
りも大きい。The combined focal length of the entire system is f, the combined focal length of the first and second lenses is f 1,2 , the radius of curvature of the object-side lens surface of the third lens is R 3,1 , and the image-side lens surface is When the radius of curvature is R 3,2 , these conditions (1-1) 0.5f <f 1,2 <1.0f (1-2) 1.0 <| R 3,1 / R 3, 2 | <1.9 is satisfied. As is clear from the condition (1-2), the third
Comparing the radius of curvature of each lens surface of the lens, the absolute value of the radius of curvature of the object-side lens surface is larger than the radius of curvature of the image-side lens surface.
【０００８】上記全系の合成焦点距離：ｆ、第１，第２
レンズの合成焦点距離：ｆ１，２は、条件 （２−１） ０．７ｆ＜ｆ１，２＜１．０ｆ を満足することが望ましい（請求項２）。The combined focal length of the entire system: f, first and second
Lens composite focal length of: f 1, 2, the condition (2-1) 0.7f <it is desirable to satisfy the f 1,2 <1.0f (claim 2).
【０００９】[0009]
【作用】条件（１−１）は、この発明の複写機用レンズ
の基本的なパワー配分を定める条件である。この条件
（１−１）の上限を超えると、ペッツバール和が大きく
なり過ぎて像面が負の側へ倒れ、非点収差が大きくな
る。下限を超えると、ペッツバール和が小さくなりすぎ
て像面が正の側へ倒れ、像面湾曲が大きくなる。従っ
て、条件（１−１）の範囲外では、全画面にわたって良
好な結像性能を得ることが出来ない。The condition (1-1) is a condition for determining the basic power distribution of the lens for a copying machine according to the present invention. When the value exceeds the upper limit of the condition (1-1), the Petzval sum becomes too large, and the image surface falls to the negative side, and astigmatism increases. If the lower limit is exceeded, the Petzval sum becomes too small and the image plane falls to the positive side, and the field curvature increases. Therefore, out of the range of the condition (1-1), good imaging performance cannot be obtained over the entire screen.
【００１０】条件（１−２）は、コマ収差を補正するた
めの条件である。条件（１−２）の上限を超えると、物
体高を負にしたときの上光線のコマ収差が正になり、コ
マ収差の形は下に凸となる。下限を超えると、コマフレ
アが増大する。従って、条件（１−２）の範囲外では、
ＭＴＦが劣化してしまう。The condition (1-2) is a condition for correcting coma. When the value exceeds the upper limit of the condition (1-2), the coma of the upper ray when the object height is made negative becomes positive, and the form of the coma becomes convex downward. Above the lower limit, coma flare increases. Therefore, out of the range of the condition (1-2),
MTF deteriorates.
【００１１】全系の合成焦点距離：ｆと、第１，第２レ
ンズの合成焦点距離：ｆ１，２とが、条件（１−１）よ
りも若干狭い、条件（２−１）を満足するようにするこ
とにより、結像性能をより向上させることができる。The combined focal length f of the whole system and the combined focal lengths f 1 and f 1 of the first and second lenses are slightly smaller than the condition (1-1) and satisfy the condition (2-1). By doing so, the imaging performance can be further improved.
【００１２】[0012]
【実施例】以下、具体的な実施例を４例上げる。各実施
例とも、第２レンズと第３レンズとの間に「絞り」が配
備されている。EXAMPLES Four specific examples will be described below. In each embodiment, an "aperture" is provided between the second lens and the third lens.
【００１３】各実施例において、物体側から数えて第ｉ
番目の面（絞り面を含む）の曲率半径をｒｉ、第ｉ番目
と第ｉ＋１番目の面の光軸上の面間隔をｄｉ、物体側か
ら数えて第ｊ番目のレンズの屈折率およびアッベ数をそ
れぞれｎｊ，νｊで表す。またｆは全系の焦点距離、ｆ
１，２は第１，第２レンズの合成焦点距離、Ｒ３，１は
第３レンズの物体側レンズ面の曲率半径、Ｒ３，２は第
３レンズの像側レンズ面の曲率半径、Ｆ／Ｎｏは明る
さ、ｍは倍率、ωは画角を表す。In each of the embodiments, the i-th position is counted from the object side.
The radius of curvature of the i-th surface (including the stop surface) is r i , the distance between the i-th surface and the (i + 1) -th surface on the optical axis is d i , the refractive index of the j-th lens counted from the object side, and Abbe numbers are represented by n j and v j , respectively. F is the focal length of the entire system, f
1, 2 are the combined focal lengths of the first and second lenses, R 3,1 is the radius of curvature of the object side lens surface of the third lens, R 3,2 is the radius of curvature of the image side lens surface of the third lens, F / No denotes brightness, m denotes magnification, and ω denotes angle of view.
【００１４】実施例１ ｆ＝１９０．０ｍｍ，Ｆ／Ｎｏ＝５．４，ｍ＝１．０，ω＝２１．５（度） ｉ ｒｉ ｄｉ ｊ ｎｊ νｊ １ ５５．２８４ １５．０ １ １．７２０００ ４６．０３ ２ −１１３４．５５３ ４．８３８ ２ １．６２５８８ ３５．７ ３ ７３．２５６ １．７６６ ４ （絞り） １．６４４ ５ −７３．３６８ ３．４６５ ３ １．６３６３６ ３５．３８ ６ ６６．１ ２．９２２ ７ １１２．９２９ １０．３６５ ４ １．７２０００ ４６．０３ ８ −６９．６０５ [0014] Example 1 f = 190.0mm, F / No = 5.4, m = 1.0, ω = 21.5 ( degrees) i r i d i j n j ν j 1 55.284 15. 0 1 1.72000 46.03 2 -1134.553 4.838 2 1.6258 35.7 3 73.256 1.766 4 (Aperture) 1.644 5 -73.368 3.465 3 1.63636 35 .38 6 66.1 2.922 7 112.929 10.365 4 1.72000 46.038 -69.605
【００１５】 Ｒ３，１＝ｒ５，Ｒ３，２＝ｒ６ 条件式の値 ｆ１，２＝０．８９９ｆ，｜Ｒ３，１／Ｒ３，２｜＝１．１１０ R 3,1 = r 5 , R 3,2 = r 6 Value of conditional expression f 1,2 = 0.899f, | R 3,1 / R 3,2 | = 1.110
【００１６】実施例２ ｆ＝１９０．０ｍｍ，Ｆ／Ｎｏ＝５．４，ｍ＝１．０，ω＝２１．５（度） ｉ ｒｉ ｄｉ ｊ ｎｊ νｊ １ ５２．２９３ １５．０ １ １．６９７００ ４８．５１ ２ −４４９．８０５ ４．５ ２ １．６０３４２ ３８．０１ ３ ７１．４９４ １．７ ４ （絞り） １．５ ５ −８０．００１ ２．５ ３ １．６２００４ ３６．２６ ６ ６１．２５ ３．５ ７ １１１．８８７ １１．２ ４ １．６９７００ ４８．５１ ８ −７３．４ [0016] Example 2 f = 190.0mm, F / No = 5.4, m = 1.0, ω = 21.5 ( degrees) i r i d i j n j ν j 1 52.293 15. 0 1 1.69700 48.51 2 -449.805 4.5 2 1.60342 38.01 3 71.494 1.74 (aperture) 1.55 -80.001 2.53 1.62004 36 .26 6 61.25 3.5 7 111.887 11.24 1.69700 48.518-8-73.4
【００１７】 Ｒ３，１＝ｒ５，Ｒ３，２＝ｒ６ 条件式の値 ｆ１，２＝０．８２４ｆ，｜Ｒ３，１／Ｒ３，２｜＝１．３０６ R 3,1 = r 5 , R 3,2 = r 6 Values of conditional expressions f 1,2 = 0.824f, | R 3,1 / R 3,2 | = 1.306
【００１８】実施例３ ｆ＝１９０．０ｍｍ，Ｆ／Ｎｏ＝５．４，ｍ＝１．０，ω＝２１．５（度） ｉ ｒｉ ｄｉ ｊ ｎｊ νｊ １ ５２．６２１ １５．０ １ １．７４４００ ４４．７９ ２ ７２４．５８９ ４．７６８ ２ １．６３９８０ ３４．４８ ３ ７０．５９９ １．７９８ ４ （絞り） １．１４５ ５ −１０５．７０８ ４．１１５ ３ １．６６６８０ ３３．０５ ６ ５９．０８８ ３．１７５ ７ １００．９１７ １５．０ ４ １．７４４００ ４４．７９ ８ −９０．８１９ [0018] Example 3 f = 190.0mm, F / No = 5.4, m = 1.0, ω = 21.5 ( degrees) i r i d i j n j ν j 1 52.621 15. 0 1 1.74400 44.79 2 724.589 4.768 2 1.69803 34.48 3 70.599 1.798 4 (aperture) 1.145 5 -105.708 4.115 3 1.66680 33. 05 6 59.088 3.175 7 100.917 15.0 4 1.74400 44.79 8 -90.819
【００１９】 Ｒ３，１＝ｒ５，Ｒ３，２＝ｒ６ 条件式の値 ｆ１，２＝０．８２０ｆ，｜Ｒ３，１／Ｒ３，２｜＝１．７８９ R 3,1 = r 5 , R 3,2 = r 6 Value of conditional expression f 1,2 = 0.820f, | R 3,1 / R 3,2 | = 1.789
【００２０】実施例４ ｆ＝１９０．０ｍｍ，Ｆ／Ｎｏ＝５．４，ｍ＝１．０，ω＝２１．５（度） ｉ ｒｉ ｄｉ ｊ ｎｊ νｊ １ ５５．４４３ １５．０ １ １．６７７９０ ５０．７２ ２ −１２６．０２５ ６．６９９ ２ １．５９５５１ ３９．２１ ３ ８１．５１４ １．３５７ ４ （絞り） １．５１３ ５ −７３．２０９ ３．０ ３ １．５９５５１ ３９．２１ ６ ６５．０６１ ４．４２２ ７ １３２．７３４ ９．５４６ ４ １．６７７９０ ５０．７２ ８ −７０．３９９ [0020] Example 4 f = 190.0mm, F / No = 5.4, m = 1.0, ω = 21.5 ( degrees) i r i d i j n j ν j 1 55.443 15. 0 1 1.67790 50.722 2-126.025 6.699 2 1.55951 39.21 3 81.514 1.357 4 (Aperture) 1.513 5 -73.209 3.03 1.595551 39 .21 6 65.061 4.422 7 132.734 9.546 4 1.67790 50.72 8 -70.399
【００２１】 Ｒ３，１＝ｒ５，Ｒ３，２＝ｒ６ 条件式の値 ｆ１，２＝０．７８６ｆ，｜Ｒ３，１／Ｒ３，２｜＝１．１２５ R 3,1 = r 5 , R 3,2 = r 6 Values of conditional expressions f 1,2 = 0.786f, | R 3,1 / R 3,2 | = 1.125
【００２２】実施例１ないし４に関する収差図を図２な
いし図５に順次示す。これらの収差図において、
はそれぞれｄ，Ｃ，Ｆ線に関するものであることを示
す。また球面収差の図において、実線は球面収差、破線
は正弦条件を示す。非点収差の図における実線はサジタ
ル光線、破線はメリディオナル光線を表す。またＹは像
高を表す。各実施例とも軸上・軸外の収差バランスが良
く、コマ収差も開口効率が略１００％であるにも拘ら
ず、コマフレアが小さく、高いコントラストを達成して
いる。The aberration diagrams for the first to fourth embodiments are shown sequentially in FIGS. In these aberration diagrams,
Indicates that it relates to the d, C, and F lines, respectively. In the diagram of spherical aberration, a solid line indicates spherical aberration, and a broken line indicates a sine condition. The solid line in the figure of astigmatism represents a sagittal ray, and the broken line represents a meridional ray. Y represents the image height. In each embodiment, on-axis and off-axis aberrations are well-balanced, and coma has a small coma flare and achieves high contrast despite the aperture efficiency of about 100%.
【００２３】[0023]
【発明の効果】以上のように、この発明によれば新規な
複写機用レンズを提供できる。このレンズは４枚構成と
構成枚数が少ないにも拘らず、非対称型で収差補正用パ
ラメーターの自由度が大きいから、比較的安価な硝材を
用いて、大口径、広画角かつ略１００％の開口効率を実
現できる。As described above, according to the present invention, a novel lens for a copying machine can be provided. Although this lens has a four-element configuration and a small number of components, it is asymmetrical and has a large degree of freedom in aberration correction parameters. Therefore, a relatively inexpensive glass material is used, and a large aperture, a wide angle of view, and approximately 100% Aperture efficiency can be realized.
【図１】この発明のレンズ構成を説明するための図であ
る。FIG. 1 is a diagram for explaining a lens configuration according to the present invention.
【図２】実施例１に関する収差図である。FIG. 2 is an aberration diagram relating to Example 1.
【図３】実施例２に関する収差図である。FIG. 3 is an aberration diagram relating to Example 2.
【図４】実施例３に関する収差図である。FIG. 4 is an aberration diagram relating to Example 3.
【図５】実施例４に関する収差図である。FIG. 5 is an aberration diagram relating to Example 4.
１ 第１レンズ ２ 第２レンズ ３ 第３レンズ ４ 第４レンズ DESCRIPTION OF SYMBOLS 1 1st lens 2 2nd lens 3 3rd lens 4 4th lens
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭55−81316（ＪＰ，Ａ) 特開 昭57−6820（ＪＰ，Ａ) 特開 昭57−161823（ＪＰ，Ａ) 特開 昭58−9118（ＪＰ，Ａ) 特開 昭58−220116（ＪＰ，Ａ) 特開 昭59−211013（ＪＰ，Ａ) 特開 昭61−277914（ＪＰ，Ａ) 特開 昭61−292119（ＪＰ，Ａ) 特開 昭62−9310（ＪＰ，Ａ) 特開 昭62−25719（ＪＰ，Ａ) 特開 平１−261615（ＪＰ，Ａ) 特開 平３−100512（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 9/00 - 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-55-81316 (JP, A) JP-A-57-6820 (JP, A) JP-A-57-161823 (JP, A) JP-A-58-81 9118 (JP, A) JP-A-58-220116 (JP, A) JP-A-59-211013 (JP, A) JP-A-61-277914 (JP, A) JP-A-61-292119 (JP, A) JP-A-62-9310 (JP, A) JP-A-62-25719 (JP, A) JP-A-1-261615 (JP, A) JP-A-3-100512 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) G02B 9/00-17/08 G02B 21/02-21/04 G02B 25/00-25/04
Claims (2)
し第４レンズを配してなり、 第１レンズは正レンズ、第２レンズは負レンズ、第３レ
ンズは両凹レンズ、第４レンズは両凸レンズで、第１，
第２レンズが接合された３群４枚構成であり、全系の合
成焦点距離をｆ、第１，第２レンズの合成焦点距離をｆ
１，２、第３レンズの物体側レンズ面の曲率半径をＲ
３，１、像側レンズ面の曲率半径をＲ３，２とすると
き、これらが、条件 （１−１）０．５ｆ＜ｆ１，２＜１．０ｆ （１−２）１．０＜｜Ｒ３，１／Ｒ３，２｜＜１．９ を満足することを特徴とする、複写機用レンズ。A first lens, a second lens, a second lens, a third lens, a biconcave lens, a fourth lens, lens is biconvex lens, the first,
It is a three-group, four-element configuration in which the second lens is cemented. The combined focal length of the entire system is f, and the combined focal length of the first and second lenses is f.
1 , 2 , the radius of curvature of the object side lens surface of the third lens is R
3,1, when the radius of curvature of the image side lens surface and R 3,2, these are conditions (1-1) 0.5f <f 1,2 < 1.0f (1-2) 1.0 < | R 3,1 / R 3,2 | <1.9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26371391A JP3181944B2 (en) | 1991-10-11 | 1991-10-11 | Copier lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26371391A JP3181944B2 (en) | 1991-10-11 | 1991-10-11 | Copier lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05100162A JPH05100162A (en) | 1993-04-23 |
| JP3181944B2 true JP3181944B2 (en) | 2001-07-03 |
Family
ID=17393286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26371391A Expired - Fee Related JP3181944B2 (en) | 1991-10-11 | 1991-10-11 | Copier lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3181944B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102360132B1 (en) * | 2015-01-13 | 2022-02-07 | 주식회사 엘엑스세미콘 | Apparatus for rear combination lamp and method for controlling thereof |
-
1991
- 1991-10-11 JP JP26371391A patent/JP3181944B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102360132B1 (en) * | 2015-01-13 | 2022-02-07 | 주식회사 엘엑스세미콘 | Apparatus for rear combination lamp and method for controlling thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05100162A (en) | 1993-04-23 |
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