JP3037967B2 - Magnifying projection lens - Google Patents
Magnifying projection lensInfo
- Publication number
- JP3037967B2 JP3037967B2 JP02171054A JP17105490A JP3037967B2 JP 3037967 B2 JP3037967 B2 JP 3037967B2 JP 02171054 A JP02171054 A JP 02171054A JP 17105490 A JP17105490 A JP 17105490A JP 3037967 B2 JP3037967 B2 JP 3037967B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- condition
- lens group
- group
- projection lens
- 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 - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Lenses (AREA)
Description
「産業上の利用分野」 本発明は、望遠鏡などの対物レンズによる物体の像、
あるいは物体そのものを10〜20倍程度に拡大し結像する
拡大投影レンズに関するものである。 「従来の技術及びその課題」 一般的に、望遠鏡の対物レンズ等によって結像した像
を拡大投影するためのレンズには、簡易的に接眼レンズ
が流用されている。しかし、接眼レンズは眼視用として
アフォーカル状態にて収差補正されたものであり、これ
を拡大投影用として使用した場合には、使用倍率が変化
することにより、歪曲収差，像面弯曲，倍率色収差等の
収差が過度に発生するといった課題がある。 また、この種の拡大投影レンズに、一般的な、例えば
ガウスタイプなどのレンズ系を採用すると、対物レンズ
で一担結像した軸外光束は、レンズ系の外側を通過する
ため、良好な収差補正が困難であるという課題があっ
た。 さらに、眼視光学系として使用する場合には、アイポ
イントが拡大レンズ系内部に入り、全視野が観察しにく
いという課題が生じる。 「目的」 本発明は、上述の課題を解決すべくなされたもので、
FNO1:6程度の対物レンズと組合わせて、半画角20゜程度
を含み、倍率10〜20倍程度で周辺まで高い結像性能を有
する拡大投影レンズを提供しようとするものである。 さらに、本発明では、アフォーカル系として眼視観察
に使用した場合にも、アポイントをレンズ系の外に持
ち、全視野を覗くことのできるレンズ系を提供するもの
である。 「課題を解決するための手段」 本発明の拡大投影レンズは、物体側から順に、物体側
に凹面を向けたメニスカスの第１レンズ群と、両凸レン
ズの第２レンズ群と、凸面を物体側に向けた正メニスカ
スレンズの第３レンズ群と、両凹レンズの第４レンズ群
と、両凸レンズの第５レンズ群とから成り、第１レンズ
群は負レンズと正レンズの接合レンズで構成され、以下
の条件を満足することを特徴とする。 ただし 「作用」 本発明の拡大投影レンズは、上述したように５つのレ
ンズ群で構成されるが、この中で第１レンズ群は、主に
対物レンズによる像の周辺部の光束が発散するのを防
ぎ、収差の発生をおさえながら、この光束を拡大レンズ
内に向ける機能を持つ。そのために、第１レンズ群は、
条件（１）に示すように物体側に凹面を向けたメニスカ
ス形状をしている。 条件（１）で下限をこえると、第１レンズ群は強い負
のパワーを持ち、また上限をこえると、逆に強い正のパ
ワーを持ち、歪曲収差，コマ収差などが過度に発生し、
後のレンズ群による補正が困難となる。 条件（２）は、同様に第２レンズ群に関し、特に倍率
色収差の補正に関する条件である。第２、第３レンズ群
が強い正のパワーを持つため、第１レンズを接合レンズ
とし、条件（２）において規定する硝材の組合せにより
倍率色収差を補正するものであり、条件（２）の下限を
こえると、倍率色収差の補正は困難となる。 条件（３）は、ペッツバール和を補正な値に保ち、像
面湾曲を補正する条件で、下限をこえると、像面湾曲が
過大になり、またこれを補正するためには各面の曲率半
径を小さくすることが必要になり、加工コスト、製作誤
差感度が過大となる。 条件（４）は、正メニスカスの第３レンズ群の形状パ
ワーに関する。強い正のパワーを持つ第２レンズ群で、
曲げられた軸外光束が、第３レンズ群に入射するが、第
３レンズ群の形状を条件（４）の範囲に設定することに
より、コマ収差が発生しにくいアプラナチックな面を作
っている。従って条件（４）で、上限、または下限をこ
えると、コマ収差が発生しやすいので好ましくない。 条件（５），（６）は、負の第４レンズ群に関する条
件である。第４レンズ群は、強い負のパワーを持ち、諸
収差の補正に大きく関与している。 条件（５）は、第４レンズ群のパワーに関し、大きな
負のペッツバール和を持たせて良好に収差を補正する基
本的な条件を示す。条件（５）で下限をこえると、ペッ
ツバール和が全体的に過大となり、上限をこえると、ペ
ッツバール和は小さくなるが、曲率半径が小さく、かつ
誤差に対する感度が高くなるため、コストが高く製作し
にくいものとなる。 条件（６）は、第４レンズ群の形状に関し、特に歪曲
収差の補正に関与する条件である。条件（６）の下限を
こえると、第８面での歪曲収差の補正効果が少なくな
り、大きな正の歪曲収差が発生し、上限をこえると、第
８面での非点収差が大きく発生し、共に良好な性能が得
られない。 条件（７），（８）は、正の第５レンズ群に関するも
ので、条件（７）は条件（３），（５）などと共に基本
的なレンズのパワー配分に関し、適度なレンズパワーの
配分にて、低コストで作りやすいレンズ系を得るための
条件である。この条件（７）の下限をこえると、設計的
には収差補正できるが、他の各レンズ群のパワーも過大
になり、製作誤差による性能の劣化が著るしい。上限を
こえると、ペッツバール和が大きくなり過ぎて、良好な
設計性能が得にくくなってしまう。 条件（８）は、第５レンズ群の形状に関し、特に非点
収差を良好に補正するものである。条件（６）で歪曲収
差の補正のために第８面（r8）の範囲を設定したが、こ
れにより非点収差が大きく残存している。その非点収差
を補正するのが条件（８）で、上，下限の何れをこえて
も非点収差が過大に発生してしまう。 「実施例」 以下、本発明の拡大投影レンズの実施例を記載する。
ここで、FNOは入射光のＦナンバー,fは全系の焦点距離,
mは倍率，ωは半画角,fBはバックフォーカス,rはレンズ
各面の曲率半径,dはレンズ厚またはレンズ間隔,nは各レ
ンズのｄ−lineの屈折率，νは各レンズンのアッベ数で
ある。"Industrial application field" The present invention relates to an image of an object by an objective lens such as a telescope,
Alternatively, the present invention relates to a magnifying projection lens that magnifies an object itself by about 10 to 20 times to form an image. “Conventional technology and its problems” Generally, an eyepiece is simply used as a lens for enlarging and projecting an image formed by an objective lens of a telescope or the like. However, the eyepiece is an afocal lens which is corrected for aberrations in an afocal state for visual observation. When this is used for magnifying projection, the magnification used changes, thereby causing distortion, curvature of field, and magnification. There is a problem that aberration such as chromatic aberration occurs excessively. Also, if a general lens system such as a Gaussian type lens is used for this kind of magnifying projection lens, the off-axis light flux imaged by the objective lens passes through the outside of the lens system, resulting in good aberration. There is a problem that correction is difficult. Furthermore, when used as a visual optical system, there arises a problem that the eye point enters the inside of the magnifying lens system and it is difficult to observe the entire field of view. [Purpose] The present invention has been made to solve the above-mentioned problems,
It is an object of the present invention to provide a magnifying projection lens having a half angle of view of about 20 °, a magnification of about 10 to 20 times, and high imaging performance up to the periphery in combination with an objective lens of about F NO 1: 6. Further, the present invention provides a lens system which has an appointment outside the lens system and allows a full field of view even when used as an afocal system for visual observation. [Means for Solving the Problems] An enlarged projection lens according to the present invention includes, in order from the object side, a first meniscus lens group having a concave surface facing the object side, a second lens group of a biconvex lens, and a convex surface facing the object side. , A third lens group of a positive meniscus lens, a fourth lens group of a biconcave lens, and a fifth lens group of a biconvex lens. The first lens group is composed of a cemented lens of a negative lens and a positive lens. It is characterized by satisfying the following conditions. However [Operation] The magnifying projection lens of the present invention is composed of five lens groups as described above. Among them, the first lens group mainly prevents the luminous flux of the peripheral portion of the image by the objective lens from diverging. It has the function of directing this light beam into the magnifying lens while preventing the occurrence of aberrations. Therefore, the first lens group is
It has a meniscus shape with the concave surface facing the object side as shown in condition (1). When the value goes below the lower limit in the condition (1), the first lens unit has a strong negative power. When the value goes beyond the upper limit, the first lens group has a strong positive power. On the contrary, excessive distortion and coma occur.
It becomes difficult to perform correction by the subsequent lens group. The condition (2) similarly relates to the second lens group, and particularly relates to correction of lateral chromatic aberration. Since the second and third lens groups have strong positive power, the first lens is a cemented lens, and the chromatic aberration of magnification is corrected by a combination of glass materials specified in the condition (2). When the value exceeds the above, it becomes difficult to correct lateral chromatic aberration. The condition (3) is a condition for keeping the Petzval sum at a correct value and correcting the field curvature. If the lower limit is exceeded, the field curvature becomes excessive. To correct this, the radius of curvature of each surface is required. Must be reduced, and the processing cost and the manufacturing error sensitivity become excessive. Condition (4) relates to the shape power of the positive meniscus third lens unit. In the second lens group with strong positive power,
The bent off-axis light beam enters the third lens group. By setting the shape of the third lens group in the range of the condition (4), an aplanatic surface where coma aberration hardly occurs is formed. Therefore, if the value exceeds the upper limit or the lower limit in the condition (4), coma is likely to occur, which is not preferable. Conditions (5) and (6) are conditions relating to the negative fourth lens group. The fourth lens group has a strong negative power and is greatly involved in correcting various aberrations. The condition (5) indicates a basic condition regarding the power of the fourth lens group that has a large negative Petzval sum and favorably corrects aberration. If the lower limit is exceeded in the condition (5), the Petzval sum becomes excessively large, and if the upper limit is exceeded, the Petzval sum becomes small. However, the radius of curvature is small and the sensitivity to errors is high. It will be difficult. Condition (6) is a condition relating to the shape of the fourth lens group, particularly relating to correction of distortion. When the value exceeds the lower limit of the condition (6), the effect of correcting distortion on the eighth surface decreases, and a large positive distortion occurs. When the value exceeds the upper limit, astigmatism on the eighth surface greatly increases. And good performance cannot be obtained. Conditions (7) and (8) relate to the positive fifth lens group, and condition (7) relates to basic lens power distribution along with conditions (3) and (5), and an appropriate lens power distribution Is a condition for obtaining a lens system which is easy to manufacture at low cost. If the lower limit of condition (7) is exceeded, aberrations can be corrected in terms of design, but the power of the other lens units also becomes excessively large, and performance degradation due to manufacturing errors is remarkable. If the upper limit is exceeded, the Petzval sum becomes too large, and it becomes difficult to obtain good design performance. Condition (8) relates to the shape of the fifth lens unit, and particularly favorably corrects astigmatism. Under the condition (6), the range of the eighth surface (r 8 ) is set for correcting distortion, but astigmatism remains largely. The condition (8) is to correct the astigmatism. Exceeding any of the upper and lower limits results in excessive astigmatism. "Examples" Examples of the magnifying projection lens of the present invention will be described below.
Here, F NO is the F number of the incident light, f is the focal length of the entire system,
m is a magnification, ω is a half angle of view, f B is a back focus, r is a radius of curvature of each lens surface, d is a lens thickness or a lens interval, n is a refractive index of d-line of each lens, and ν is a refractive index of each lens. Abbe number.
【実施例１】 FNO＝1:6 ｆ＝8.02 ｍ＝−11.921 ω＝21゜ fB＝96.13 面No. ｒ ｄ ｎ ν １ −8.450 1.00 1.80518 25.4 ２ 23.241 3.20 1.69680 55.5 ３ −8.873 0.20 ４ 9.260 3.05 1.69680 55.5 ５ −17.464 0.45 ６ 7.056 2.40 1.69680 55.5 ７ 17.464 0.70 ８ −7.871 1.00 1.75520 27.5 ９ 7.056 1.91 10 23.241 2.10 1.77250 49.6 11 −8.873 Example 1 F NO = 1: 6 f = 8.02 m = −11.921 ω = 21 ゜ f B = 96.13 Surface No. rd nv 1 −8.450 1.00 1.80518 25.4 2 23.241 3.20 1.69680 55.5 3 −8.873 0.20 4 9.260 3.05 1.69680 55.5 5 -17.464 0.45 6 7.056 2.40 1.69680 55.5 7 17.464 0.70 8 -7.871 1.00 1.75520 27.5 9 7.056 1.91 10 23.241 2.10 1.77250 49.6 11 -8.873
【実施例２】 FNO＝1:6 ｆ＝7.99 ｍ＝−12.076 ω＝21゜ fB＝97.37 面No. ｒ ｄ ｎ ν １ −7.819 1.00 1.78472 25.7 ２ 21.333 3.00 1.69680 55.5 ３ −8.091 0.20 ４ 11.302 2.73 1.69680 55.5 ５ −15.350 0.24 ６ 6.500 2.03 1.69680 55.5 ７ 10.183 1.55 ８ −7.222 1.00 1.74077 27.8 ９ 6.750 1.35 10 16.912 2.00 1.77250 49.6 11 −7.490 Example 2 F NO = 1: 6 f = 7.99 m = −12.076 ω = 21 ° f B = 97.37 Surface No. r dn ν 1 −7.819 1.00 1.78472 25.7 2 21.333 3.00 1.69680 55.5 3 −8.091 0.20 4 11.302 2.73 1.69680 55.5 5 -15.350 0.24 6 6.500 2.03 1.69680 55.5 7 10.183 1.555 8 -7.222 1.00 1.74077 27.8 9 6.750 1.35 10 16.912 2.00 1.77250 49.6 11 -7.490
【実施例３】 FNO＝1:6 ｆ＝8.00 ｍ＝−12.412 ω＝21゜ fB＝95.29 面No. ｒ ｄ ｎ ν １ −10.137 1.82 1.80518 25.4 ２ 20.000 2.81 1.80400 46.6 ３ −8.000 0.20 ４ 6.892 2.77 1.73400 51.5 ５ −20.692 0.20 ６ 10.271 2.01 1.80400 46.6 ７ 27.704 0.46 ８ −7.636 1.00 1.80518 25.4 ９ 7.000 3.67 10 99.698 2.06 1.72916 54.7 11 −8.609 Example 3 F NO = 1: 6 f = 8.00 m = -12.412 ω = 21 ° f B = 95.29 surface No. r d n ν 1 -10.137 1.82 1.80518 25.4 2 20.000 2.81 1.80400 46.6 3 -8.000 0.20 4 6.892 2.77 1.73400 51.5 5 -20.692 0.20 6 10.271 2.01 1.80400 46.6 7 27.704 0.46 8 -7.636 1.00 1.80518 25.4 9 7.000 3.67 10 99.698 2.06 1.72916 54.7 11 -8.609
【実施例４】 FNO＝1:6 ｆ＝8.12 ｍ＝−11.846 ω＝21゜ fB＝98.16 面No. ｒ ｄ ｎ ν １ −8.000 1.00 1.69895 30.1 ２ 35.000 2.55 1.69680 55.5 ３ −8.000 0.20 ４ 15.142 2.60 1.69680 55.5 ５ −15.142 0.20 ６ 7.000 2.06 1.69680 55.5 ７ 17.279 0.80 ８ −9.680 1.00 1.80518 25.4 ９ 7.000 1.80 10 18.987 1.80 1.69680 55.5 11 −7.000 Example 4 F NO = 1: 6 f = 8.12 m = −11.846 ω = 21 ° f B = 98.16 Surface No. r dn ν 1 −8.000 1.00 1.69895 30.1 2 35.000 2.55 1.69680 55.5 3 −8.000 0.20 4 15.142 2.60 1.69680 55.5 5 −15.142 0.20 6 7.000 2.06 1.69680 55.5 7 17.279 0.80 8 −9.680 1.00 1.80518 25.4 9 7.000 1.80 10 18.987 1.80 1.69680 55.5 11 −7.000
【実施例５】 FNO＝1:6 ｆ＝8.00 ｍ＝−5.581 ω＝21゜ fB＝43.54 面No. ｒ ｄ ｎ ν １ −8.947 0.69 1.80518 25.4 ２ 11.771 4.98 1.69680 55.5 ３ −8.486 0.11 ４ 12.331 3.39 1.69680 55.5 ５ −20.485 0.11 ６ 7.114 3.33 1.77250 49.6 ７ 13.091 0.86 ８ −12.057 0.91 1.80518 25.4 ９ 5.722 2.21 10 24.743 1.66 1.77250 49.6 11 −8.313 「発明の効果」 以上のように、本発明によれば、５群６枚より成り、
前記諸条件を満足して構成することにより、周辺まで、
良好な結像性能の拡大投影レンズが得られる。Example 5 F NO = 1: 6 f = 8.00 m = −5.581 ω = 21 ゜ f B = 43.54 Surface No. rd nν 1 −8.947 0.69 1.80518 25.4 2 11.771 4.98 1.69680 55.5 3 −8.486 0.11 4 12.331 3.39 1.69680 55.5 5 −20.485 0.11 6 7.114 3.33 1.77250 49.6 7 13.091 0.86 8 −12.057 0.91 1.80518 25.4 9 5.722 2.21 10 24.743 1.66 1.77250 49.6 11 −8.313 "Effects of the Invention" As described above, according to the present invention, the lens includes six elements in five groups,
By configuring to satisfy the above conditions, to the periphery,
An enlarged projection lens with good imaging performance is obtained.
【図面の簡単な説明】 第１図，第３図，第５図，第７図，第９図は、それぞれ
本発明の実施例1,2,3,4,5のレンズ断面図である。 第２図，第４図，第６図，第８図，第10図は、FNO1:6程
度の対物レンズ（無収差の対物レンズ）に装着した場合
の、実施例1,2,3,4,5の諸収差図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, FIG. 3, FIG. 5, FIG. 7, and FIG. 9 are lens cross-sectional views of Examples 1, 2, 3, 4, and 5 of the present invention, respectively. FIGS. 2, 4, 6, 8, and 10 show examples 1, 2, and 3 when mounted on an objective lens (aberration-free objective lens) having an F NO of about 1: 6. , 4, 5 are aberration diagrams.
───────────────────────────────────────────────────── フロントページの続き (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 Continued on the front page (58) Fields surveyed (Int. Cl. 7 , DB name) G02B 9/00-17/08 G02B 21/02-21/04 G02B 25/00-25/04
Claims (1)
ニスカスの第１レンズ群と、両凸レンズの第２レンズ群
と、凸面を物体側に向けた正メニスカスレンズの第３レ
ンズ群と、両凹レンズの第４レンズ群と、両凸レンズの
第５レンズ群とから成り、第１レンズ群は負レンズと正
レンズの接合レンズで構成され、以下条件を満足するこ
とを特徴とする拡大投影レンズ。 ただし 1. A first lens group of a meniscus having a concave surface facing the object side, a second lens group of a biconvex lens, and a third lens group of a positive meniscus lens having a convex surface facing the object sequentially from the object side. A fourth lens group of a biconcave lens and a fifth lens group of a biconvex lens, and the first lens group is composed of a cemented lens of a negative lens and a positive lens, and satisfies the following conditions. lens. However
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18855489 | 1989-07-20 | ||
| JP1-188554 | 1989-07-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03121406A JPH03121406A (en) | 1991-05-23 |
| JP3037967B2 true JP3037967B2 (en) | 2000-05-08 |
Family
ID=16225728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02171054A Expired - Fee Related JP3037967B2 (en) | 1989-07-20 | 1990-06-28 | Magnifying projection lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3037967B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5423897A (en) * | 1990-12-20 | 1995-06-13 | Hudson; Alice P. | Non-blocking wax sealants for fertilizers |
| TWI582458B (en) | 2016-04-22 | 2017-05-11 | 大立光電股份有限公司 | Imaging optical lens system, image capturing unit and electronic device |
| CN109247904B (en) * | 2018-10-26 | 2023-09-19 | 深圳英美达医疗技术有限公司 | Endoscope objective lens |
-
1990
- 1990-06-28 JP JP02171054A patent/JP3037967B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03121406A (en) | 1991-05-23 |
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