JP2003202498A - Projection zoom lens - Google Patents

Projection zoom lens

Info

Publication number
JP2003202498A
JP2003202498A JP2001401394A JP2001401394A JP2003202498A JP 2003202498 A JP2003202498 A JP 2003202498A JP 2001401394 A JP2001401394 A JP 2001401394A JP 2001401394 A JP2001401394 A JP 2001401394A JP 2003202498 A JP2003202498 A JP 2003202498A
Authority
JP
Japan
Prior art keywords
group
zoom lens
projection
lens
focal length
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
Application number
JP2001401394A
Other languages
Japanese (ja)
Other versions
JP4188595B2 (en
Inventor
Teruhisa Takeuchi
輝久 竹内
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Optical Industries Co Ltd
Original Assignee
Ricoh Optical Industries Co Ltd
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 Ricoh Optical Industries Co Ltd filed Critical Ricoh Optical Industries Co Ltd
Priority to JP2001401394A priority Critical patent/JP4188595B2/en
Publication of JP2003202498A publication Critical patent/JP2003202498A/en
Application granted granted Critical
Publication of JP4188595B2 publication Critical patent/JP4188595B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/22—Telecentric objectives or lens systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
    • G02B15/1455—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being negative
    • G02B15/145531—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being negative arranged -++++

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive, small-sized projection zoom lens having improved performance, with a small number of lenses. <P>SOLUTION: The zoom lens is provided with a 1st negative group G1, a 2nd positive group G2, a 3rd positive group G3, a 4th positive group G4, and a 5th positive group G5 in this order from a magnification side, and also, provided with a diaphragm S arranged between the 3rd and 4th groups, and in the case of varying a projection distance, the 1st group is moved in an optical axis direction so as to keep the conjugation between a plane image and a projected image, and in the case of varying the power, the 1st group G1 and the 5th group G5 are fixed and other groups are moved in the optical axis direction, and provided that fI denotes the focal distance of the I-th group, fw denotes the focal distance of the whole system at a wide angle end, parameters fw/|f<SB>1</SB>|, |f<SB>1</SB>|/f<SB>2</SB>, fw/f<SB>3</SB>and fw/f<SB>5</SB>are within prescribed ranges. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】この発明は投射用ズームレン
ズに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection zoom lens.

【０００２】[0002]

【従来の技術】液晶パネル上の画像を拡大投射する液晶
プロジェクタは、コンピュータのデータやビデオ再生画
像などの表示用として、広く普及している。なかでも、
赤・青・緑の各色画像を別個の液晶パネルに表示する
「３板式プロジェクタ」は画像が高精細であることか
ら、普及率が高い。３板式プロジェクタにおける投射用
レンズは、投射画像をスクリーンサイズに容易に合わせ
得るように、ズーム機能を有するものが一般的である。2. Description of the Related Art Liquid crystal projectors for enlarging and projecting an image on a liquid crystal panel are widely used for displaying computer data, video reproduction images and the like. Above all,
The “three-panel projector” that displays red, blue, and green images on separate liquid crystal panels has a high penetration rate because of high-definition images. A projection lens in a three-plate type projector generally has a zoom function so that a projection image can be easily adjusted to a screen size.

【０００３】３板式プロジェクタに用いられる投射用ズ
ームレンズには、一般に、以下のような属性が求められ
る。The following attributes are generally required for a projection zoom lens used in a three-plate type projector.

【０００４】即ち、赤色画像表示用、青色画像表示用、
緑色画像表示用の３枚の液晶パネルにより強度変調され
た各光束を合成するため、ダイクロイックプリズムやダ
イクロイックミラー等の色合成手段を光源側に配備する
ため、焦点距離に比して長いバックフォーカスを有する
こと。That is, for displaying a red image, displaying a blue image,
In order to combine the light fluxes intensity-modulated by the three liquid crystal panels for displaying a green image, a color combining means such as a dichroic prism or a dichroic mirror is provided on the light source side, so that a back focus longer than the focal length is achieved. To have.

【０００５】プロジェクタとして低電力で高い光利用効
率を得ることが望ましく、低電力の光源でも明るい画像
を表示できるように、光源からの光をなるべく多く取り
込めるＦナンバーの小さい、明るいレンズであること。It is desirable for the projector to obtain high light utilization efficiency with low power, and it is a bright lens with a small F number that can capture as much light from the light source as possible so that a bright image can be displayed even with a low power light source.

【０００６】色合成手段による各色画像光の光路合成時
に、色合成手段に入射する光の角度が画角により異なる
と「色シェーディング」が発生し易いので、光源部から
投射レンズに入射する光として、光軸に平行に近い光束
を用いるのが好ましく、このため、縮小側、即ち、液晶
パネル側においてテレセントリック性を持つこと。Since "color shading" is likely to occur when the angle of the light incident on the color combining means differs depending on the angle of view when combining the optical paths of the image lights of the respective colors by the color combining means. , It is preferable to use a light beam that is nearly parallel to the optical axis. Therefore, the reduction side, that is, the liquid crystal panel side should have telecentricity.

【０００７】スクリーン上で、緑、青、赤の３色画像を
重ね合わせたとき、各色画像の画素が互いにずれると良
好なカラー画像を実現できず、投射画像の辺縁部に緑、
青、赤などの縁が現れて像質が損なわれる。このような
投射画像の像質劣化を防ぐため、倍率色収差が小さく抑
えられていること。When three-color images of green, blue, and red are superimposed on the screen, if the pixels of each color image are displaced from each other, a good color image cannot be realized, and a green image is generated at the edge of the projected image.
Edges of blue, red, etc. appear and the image quality is impaired. In order to prevent such image quality deterioration of the projected image, lateral chromatic aberration should be kept small.

【０００８】投射された画像の輪郭が歪んで見苦しくな
らないように、歪曲収差が許容できる範囲に抑えられて
いること。また、液晶パネルに表示された画像を忠実に
再現できるように高いＭＴＦ、解像力を備えているこ
と。Distortion aberration is suppressed within an allowable range so that the contour of the projected image is not distorted and unsightly. In addition, it must have high MTF and resolution so that the image displayed on the liquid crystal panel can be faithfully reproduced.

【０００９】[0009]

【発明が解決しようとする課題】この発明は、少ないレ
ンズ枚数で上記諸属性を良好に実現できる良好な性能を
持つ、安価で小型な投射用ズームレンズの実現を課題と
する。SUMMARY OF THE INVENTION An object of the present invention is to realize an inexpensive and compact projection zoom lens having good performance capable of realizing the above-mentioned various attributes with a small number of lenses.

【００１０】[0010]

【課題を解決するための手段】この発明の投射用ズーム
レンズは「平面画像を拡大して投射結像させる投射用ズ
ームレンズ」である。「平面画像」は、一般に液晶パネ
ル上に表示された画像である。The projection zoom lens of the present invention is a "projection zoom lens for enlarging and projecting a two-dimensional image." A “planar image” is an image generally displayed on a liquid crystal panel.

【００１１】請求項１記載の投射用ズームレンズは、図
１に例示するように、拡大側（図の左方）から順に、負
の屈折力の第１群Ｇ１、正の屈折力の第２群Ｇ２、正の
屈折力の第３群Ｇ３、正の屈折力の第４群Ｇ４、正の屈
折力の第５群Ｇ５を配し、第３、第４群間に絞りＳを有
してなる。従って、全体の屈折力配分は「負・正・正・
正・正」である。In the projection zoom lens according to the first aspect, as illustrated in FIG. 1, the first group G1 having negative refracting power and the second group having positive refracting power are arranged in this order from the enlargement side (left side in the figure). A group G2, a third group G3 having a positive refractive power, a fourth group G4 having a positive refractive power, a fifth group G5 having a positive refractive power are arranged, and a diaphragm S is provided between the third and fourth groups. Become. Therefore, the total refractive power distribution is "negative, positive, positive,
Positive / positive ”.

【００１２】投射距離を変化させる際には、平面画像と
投射像とを共役に保つために第１群Ｇ１が光軸方向に移
動を行う。変倍に際しては、第１群Ｇ１及び第５群Ｇ５
が固定で、第２群Ｇ２、第３群Ｇ３、及び、第４群Ｇ４
が光軸方向に移動を行う。When changing the projection distance, the first group G1 moves in the optical axis direction in order to keep the plane image and the projection image conjugate. When changing the magnification, the first group G1 and the fifth group G5
Is fixed, and the second group G2, the third group G3, and the fourth group G4
Moves in the direction of the optical axis.

【００１３】第１群の焦点距離：ｆ１、第２群の焦点距
離：ｆ２、第３群の焦点距離：ｆ３、第５群の焦点距
離：ｆ５、広角端における全系の焦点距離：ｆｗは、条
件： （１） ０．７６＜ｆｗ／｜ｆ１｜＜１．４９ （２） ０．２８＜｜ｆ１｜／ｆ２＜０．５０ （３） ０．３４＜ｆｗ／ｆ３＜０．５０ （４） ０．２２＜ｆｗ／ｆ５＜０．４０ を満足する。Focal length of the first group: f 1 , focal length of the second group: f 2 , focal length of the third group: f 3 , focal length of fifth group: f 5 , focal point of entire system at wide angle end Distance: fw is a condition: (1) 0.76 <fw / | f 1 | <1.49 (2) 0.28 <| f 1 | / f 2 <0.50 (3) 0.34 <fw / F 3 <0.50 (4) 0.22 <fw / f 5 <0.40 is satisfied.

【００１４】請求項２記載の投射用ズームレンズは、図
２に例示するように、拡大側（図の左方）から順に、負
の屈折力の第１群Ｇ１、正の屈折力の第２群Ｇ２、正の
屈折力の第３群Ｇ３、負の屈折力の第４群Ｇ４、正の屈
折力の第５群Ｇ５を配し、第３、第４群間に絞りＳを有
してなる。したがって、全体の屈折力配分は「負・正・
正・負・正」である。In the projection zoom lens according to the second aspect, as illustrated in FIG. 2, the first group G1 having negative refracting power and the second group having positive refracting power are arranged in this order from the enlargement side (left side in the figure). A group G2, a third group G3 having a positive refractive power, a fourth group G4 having a negative refractive power, and a fifth group G5 having a positive refractive power are arranged, and a diaphragm S is provided between the third and fourth groups. Become. Therefore, the total refractive power distribution is "negative, positive,
Positive / negative / positive ”.

【００１５】投射距離を変化させる際には、平面画像と
投射像とを共役に保つために第１群Ｇ１が光軸方向に移
動を行う。When changing the projection distance, the first group G1 moves in the optical axis direction in order to keep the plane image and the projection image conjugate.

【００１６】変倍に際しては、第１群Ｇ１及び第５群Ｇ
５が固定で、第２群Ｇ２、第３群Ｇ３、及び、第４群Ｇ
４が光軸方向に移動を行う。When changing the magnification, the first group G1 and the fifth group G
5 is fixed, and the second group G2, the third group G3, and the fourth group G
4 moves in the optical axis direction.

【００１７】第１群の焦点距離：ｆ１、第２群の焦点距
離：ｆ２、第３群の焦点距離：ｆ３、第５群の焦点距
離：ｆ５、広角端における全系の焦点距離：ｆｗは、条
件： （５） １．１０＜ｆｗ／｜ｆ１｜＜１．３５ （６） ０．３６＜｜ｆ１｜／ｆ２＜０．４９ （７） ０．５３＜ｆｗ／ｆ３＜０．６７ （８） ０．４１＜ｆｗ／ｆ５＜０．４９ を満足する。The focal length of the first lens unit: f 1 , the focal length of the second lens unit: f 2 , the focal length of the third lens unit: f 3 , the focal length of the fifth lens unit: f 5 , the focal length of the entire system at the wide-angle end. Distance: fw is a condition: (5) 1.10 <fw / | f 1 | <1.35 (6) 0.36 <| f 1 | / f 2 <0.49 (7) 0.53 <fw / F 3 <0.67 (8) 0.41 <fw / f 5 <0.49 is satisfied.

【００１８】即ち、上記請求項１、２の投射用ズームレ
ンズは、第４群Ｇ４の屈折力が互いに逆であり、それに
応じて、条件における各パラメータ：ｆｗ／｜ｆ１｜、
｜ｆ １｜／ｆ２、ｆｗ／ｆ３、ｆｗ／ｆ５の範囲が異な
っている。That is, the projection zoom lens according to the first and second aspects is used.
The refractive powers of the fourth group G4 are opposite to each other.
Accordingly, each parameter in the condition: fw / | f1｜,
| F 1｜ / fTwo, Fw / fThree, Fw / f5The range is different
ing.

【００１９】なお、図１および図２において、符号ＰＲ
は色合成手段である「色合成プリズム」を示している。In FIG. 1 and FIG. 2, the symbol PR
Indicates a "color combining prism" which is a color combining means.

【００２０】上記請求項１または２記載の投射用ズーム
レンズにおいて、第１群Ｇ１を構成するレンズ中の少な
くとも１面を非球面とすることができる（請求項３）。
請求項１または２記載の投射用ズームレンズにおける、
第３群Ｇ３は「屈折率：１．７以上の材質による１枚の
レンズ」で構成することができ（請求項４）、この場合
において、第１群Ｇ１を構成するレンズ中の少なくとも
１面を非球面とすることが好ましい。In the projection zoom lens according to claim 1 or 2, at least one surface of the lenses constituting the first group G1 can be an aspherical surface (claim 3).
In the zoom lens for projection according to claim 1,
The third group G3 can be composed of "one lens made of a material having a refractive index of 1.7 or more" (claim 4), and in this case, at least one surface of the lenses constituting the first group G1 Is preferably an aspherical surface.

【００２１】請求項１、２の投射用ズームレンズのよう
に、拡大側から縮小側にかけて「負・正・正・正・正」
あるいは「負・正・正・負・正」の屈折力配分を持つ、
第１群Ｇ１〜第５群Ｇ５の構成とすることで、３板式プ
ロジェクタに必要な長いバックフォーカスを確保すると
ともに、小さなＦＮｏ．と広画角を実現している。Like the zoom lens for projection according to the first and second aspects, "negative / positive / positive / positive / positive" from the enlargement side to the reduction side.
Or, having a “negative / positive / positive / negative / positive” refractive power distribution,
With the configuration of the first group G1 to the fifth group G5, a long back focus required for the three-plate projector is ensured, and a small FNo. And a wide angle of view is realized.

【００２２】条件（１）、（５）は、歪曲収差を良好に
保つための条件で、上限を超えると、第１群の屈折力が
強くなりすぎ、広角端における「負の歪曲収差」の発生
が大きくなり補正困難となる。また下限を超えると、第
１群の屈折率が弱くなりすぎ、第１群の外径を大きくせ
ざるを得なくなってコンパクト化が困難になる。The conditions (1) and (5) are conditions for maintaining good distortion, and if the upper limit is exceeded, the refracting power of the first lens unit will become too strong, resulting in "negative distortion" at the wide-angle end. The occurrence becomes large and it becomes difficult to correct. On the other hand, when the value goes below the lower limit, the refractive index of the first lens unit becomes too weak, and the outer diameter of the first lens unit must be increased, which makes it difficult to make the device compact.

【００２３】条件（２）、（６）は、第１群、第２群に
おいて発生する球面収差を良好に保つための条件であ
る。球面収差は、条件（２）、（６）の下限を超えると
「レンズ側に倒れる」ように、また上限を超えると「レ
ンズの反対側に倒れる」ように発生し、他の群での補正
が困難となる。The conditions (2) and (6) are conditions for keeping the spherical aberration generated in the first and second lens groups favorable. Spherical aberration occurs as "tilting to the lens side" when the lower limits of conditions (2) and (6) are exceeded, and "tilting to the opposite side of the lens" when the upper limits are exceeded, and correction in other groups Will be difficult.

【００２４】条件（３）、（７）は、コマ収差を良好に
保ちつつ、軸上色収差の変動量を押さえるための条件
で、条件（３）、（７）の範囲を越えた場合は、コマ収
差を良好に保ちつつ、軸上色収差の変動量を他の群で補
正することが困難となる。The conditions (3) and (7) are conditions for suppressing the fluctuation amount of the axial chromatic aberration while maintaining good coma aberration, and when the ranges of the conditions (3) and (7) are exceeded, It becomes difficult to correct the variation amount of the axial chromatic aberration by another group while maintaining good coma aberration.

【００２５】条件（４）、（８）は、縮小側におけるテ
レセントリック性を良好に保つための条件であり、条件
（４）、（８）の範囲外では良好なテレセントリック性
の実現が困難である。Conditions (4) and (8) are conditions for maintaining good telecentricity on the reduction side, and it is difficult to realize good telecentricity outside the ranges of conditions (4) and (8). .

【００２６】また、通常は接合レンズを使用する第３群
として「接合レンズ」を用いることができるが、屈折
率：１．７以上の高屈折率の材質による１枚のレンズで
第３群を構成することにより、より安価なレンズとする
ことができる。Further, a "combined lens" can be used as the third group which normally uses a cemented lens, but the third group is composed of one lens made of a material having a high refractive index of 1.7 or more. With the configuration, a cheaper lens can be obtained.

【００２７】さらに、第１群を構成するレンズの少なく
とも１面を非球面とすることで、性能のより良好なレン
ズ、あるいはレンズ枚数の少ない安価なレンズとするこ
とができる。Further, by forming at least one surface of the lenses constituting the first group into an aspherical surface, it is possible to obtain a lens having better performance or an inexpensive lens having a small number of lenses.

【００２８】[0028]

【発明の実施の形態】以下、具体的な実施例を６例挙げ
る。BEST MODE FOR CARRYING OUT THE INVENTION Six specific examples will be given below.

【００２９】「記号」の説明 以下の各実施例中において使用する記号の意味は以下の
通りである。Explanation of "Symbols" The meanings of symbols used in the following examples are as follows.

【００３０】ｉ：面番号 面（レンズ面と絞りの面）が
拡大側から数えて第ｉ番目であることを表す。I: Surface number Indicates that the surface (lens surface and diaphragm surface) is the i-th surface counted from the enlargement side.

【００３１】ＩＭＧ：液晶パネル面 Ｒｉ：面番号：ｉの面の曲率半径 Ｄｉ：拡大側から数えて第ｉ番目の面と第ｉ＋１番目の
面の軸上面間隔 ｊ：レンズ番号。レンズが拡大側から数えて第ｊ番目で
あることを表す。IMG: liquid crystal panel surface Ri: surface number: radius of curvature of surface i: di: axial upper surface distance between the i-th surface and the i + 1-th surface counted from the enlargement side j: lens number. This means that the lens is the j-th lens counted from the magnification side.

【００３２】Ｎｊ：拡大側から数えて第ｊ番目のレンズ
のｄ線に対する屈折率 νｊ：拡大側から数えて第ｊ番目のレンズのアッベ数 Ｄｏ：スクリーン（投射画像の投射面）から第１レンズ
面までの距離 。Nj: Refractive index of the j-th lens from the expansion side to the d-line νj: Abbe number of the j-th lens counted from the expansion side Do: From the screen (projection image projection surface) to the first lens Distance to face.

【００３３】また、非球面は、光軸方向の座標：Ｚ、光
軸直交方向の座標：ｈ、軸上曲率半径：Ｒｉ、円錐定
数：Ｋ、高次の係数：Ａ，Ｂ，Ｃ，・・を用いる周知の
式： Ｚ＝（１／Ｒｉ）・ｈ2／［１＋√｛１−（Ｋ＋１)・
（１／Ｒｉ）2・ｈ2｝］＋Ａ・ｈ4＋Ｂ・ｈ6＋Ｃ・ｈ8
＋Ｄ・ｈ10＋Ｅ・ｈ12＋Ｆ・ｈ1４ で表し、軸上曲率半径：Ｒｉ、円錐定数：Ｋ、高次の係
数：Ａ，Ｂ，Ｃ，・・等を与えて形状を特定する。The aspherical surface has a coordinate in the direction of the optical axis: Z, a coordinate in the direction orthogonal to the optical axis: h, a radius of curvature on the axis: Ri, a conic constant: K, and higher-order coefficients: A, B, C, ... Well-known formula using: Z = (1 / Ri) · h 2 / [1 + √ {1- (K + 1) ·
(1 / Ri) 2 · h 2 }] + A · h 4 + B · h 6 + C · h 8
The shape is specified by giving + D · h 10 + E · h 12 + F · h 14 and giving an on-axis radius of curvature: Ri, a conical constant: K, a higher-order coefficient: A, B, C ,.

【００３４】なお、計算基準波長は５５０ｎｍである。
また、長さの元を持つ量の単位はｍｍである。The calculation reference wavelength is 550 nm.
The unit of the quantity having the length element is mm.

【００３５】[0035]

【実施例】 実施例１ ｉ Ｒｉ Ｄｉ ｊ Ｎｊ νｊ 0: ∞ 2200.000 1: 27.219 4.500 1 1.73014 39.4 2: 15.443 0.180 2 1.52020 52.1 3: 13.850（＊） 13.363 4: -28.926 1.800 3 1.62041 60.3 5: 30.468 可変 6: 44.780 4.430 4 1.83400 37.3 7: -54.843 可変 8: 31.566 3.097 5 1.74030 44.0 9: 662.830 7.859 10（絞り） ∞ 可変 11: -22.263 1.800 6 1.84666 23.8 12: 30.313 4.921 7 1.49700 81.6 13: -22.910 7.036 14: -84.007 3.113 8 1.62041 60.3 15: -38.846 0.300 16: 51.401 4.827 9 1.58400 42.9 17: -104.709 可変 18: 62.943 3.764 10 1.72342 38.0 19: -10059.728 5.000 20: ∞ 25.300 11 1.51680 64.2 21: ∞ 8.700 IMG: ∞ 0.000 非球面 （＊）印を付した面が非球面であり、非球面係数は以下のとおりである。【Example】   Example 1      i Ri Di j Nj νj      0: ∞ 2200.000      1: 27.219 4.500 1 1.73014 39.4      2: 15.443 0.180 2 1.52020 52.1      3: 13.850 (*) 13.363      4: -28.926 1.800 3 1.62041 60.3      5: 30.468 variable      6: 44.780 4.430 4 1.83400 37.3      7: -54.843 Variable      8: 31.566 3.097 5 1.74030 44.0      9: 662.830 7.859     10 (Aperture) ∞ Variable     11: -22.263 1.800 6 1.84666 23.8     12: 30.313 4.921 7 1.49700 81.6     13: -22.910 7.036     14: -84.007 3.113 8 1.62041 60.3     15: -38.846 0.300     16: 51.401 4.827 9 1.58400 42.9     17: -104.709 Variable     18: 62.943 3.764 10 1.72342 38.0     19: -10059.728 5.000     20: ∞ 25.300 11 1.51680 64.2     21: ∞ 8.700    IMG: ∞ 0.000   Aspherical surface   The surface marked with (*) is an aspherical surface, and the aspherical surface coefficients are as follows.

【００３６】K=-0.208088，A=-0.130389E-04，B=-0.125
680E-06，C= 0.392523E-09，D=-0.271241E-11，E=-0.28
8000E-14 上の非球面の表示において例えば「E-14」は「1
0−１４」を意味し、この数値がその直前の数値にかか
る。以下同様である。K = -0.208088, A = -0.130389E-04, B = -0.125
680E-06, C = 0.392523E-09, D = -0.271241E-11, E = -0.28
For example, "E-14" is "1" in the display of aspherical surface on 8000E-14.
" 0-14 ", and this value is applied to the value immediately before it. The same applies hereinafter.

【００３７】また、第２０面、第２１面は色合成プリズ
ムの面を示す。The twentieth surface and the twenty-first surface are surfaces of the color combining prism.

【００３８】 可変量 焦点距離 20.261 22.437 24.576 Ｄ５ 3.857 3.457 3.295 Ｄ７ 10.608 5.574 1.000 Ｄ１０ 10.545 12.090 13.738 Ｄ１７ 1.000 4.889 7.977 条件式の各パラメータの値： ｆｗ／｜ｆ１｜＝１．４７ ｜ｆ１｜／ｆ２＝０．４６ ｆｗ／ｆ３＝０．４６ ｆｗ／ｆ５＝０．２４ 。Variable amount Focal length 20.261 22.437 24.576 D5 3.857 3.457 3.295 D7 10.608 5.574 1.000 D10 10.545 12.090 13.738 D17 1.000 4.889 7.977 Value of each parameter of the conditional expression: fw / | f 1 | = 1.47 | f 1 | / f 2 = 0.46 fw / f 3 = 0.46 fw / f 5 = 0.24.

【００３９】実施例１のレンズの、広角端における断面
図を図３に、望遠端における断面図を図４に示す。ま
た、実施例１のレンズの、広角端における縦収差図を図
５、望遠端における縦収差図を図６、広角端における横
収差図を図７、望遠端における横収差図を図８にそれぞ
れ示す。A sectional view of the lens of Example 1 at the wide-angle end is shown in FIG. 3, and a sectional view at the telephoto end is shown in FIG. Further, FIG. 5 is a longitudinal aberration diagram at the wide-angle end of the lens of Example 1, FIG. 6 is a longitudinal aberration diagram at the telephoto end, FIG. 7 is a lateral aberration diagram at the wide-angle end, and FIG. 8 is a lateral aberration diagram at the telephoto end. Show.

【００４０】 実施例２ ｉ Ｒｉ Ｄｉ ｊ Ｎｊ νｊ 0: ∞ 2200.000 1: 36.113 4.500 1 1.70775 29.8 2: 16.010 0.101 2 1.52020 52.1 3: 14.289（＊） 9.698 4: -37.548 1.800 3 1.62041 60.3 5: 35.809 可変 6: 47.909 5.006 4 1.83400 37.3 7: -52.961 可変 8: 33.252 2.974 5 1.74982 33.8 9: 150.090 6.821 10（絞り） ∞ 可変 11: -22.691 1.800 6 1.84666 23.8 12: 47.733 5.362 7 1.49700 81.6 13: -22.885 0.300 14: -172.889 3.106 8 1.62041 60.3 15: -41.903 3.304 16: 420.149 2.947 9 1.64958 48.1 17: -93.858 可変 18: 46.270 4.584 10 1.72342 38.0 19: -249.265 5.000 20: ∞ 25.300 11 1.51680 64.2 21: ∞ 8.694 IMG: ∞ 0.000 非球面 （＊）印を付した面が非球面であり、非球面係数は以下のとおりである。 K= -0.145477，A=-0.161405E-04，B=-0.122805E-06，C= 0.410606E-09， D=-0.338498E-11 第２０面、第２１面は色合成プリズムの面を示す。 可変量 焦点距離 20.261 22.413 24.552 Ｄ５ 3.288 3.258 3.312 Ｄ７ 13.578 7.483 1.897 Ｄ１０ 15.098 16.429 17.901 Ｄ１７ 2.734 7.528 11.588 条件式の各パラメータの値： ｆｗ／｜ｆ１｜＝１．３８ ｜ｆ１｜／ｆ２＝０．４８ ｆｗ／ｆ３＝０．３６ ｆｗ／ｆ５＝０．３８ 。Example 2 i Ri Di j Nj νj 0: ∞ 2200.000 1: 36.113 4.500 1 1.70775 29.8 2: 16.010 0.101 2 1.52020 52.1 3: 14.289 (*) 9.698 4: -37.548 1.800 3 1.62041 60.3 5: 35.809 Variable 6 : 47.909 5.006 4 1.83400 37.3 7: -52.961 Variable 8: 33.252 2.974 5 1.74982 33.8 9: 150.090 6.821 10 (Aperture) ∞ Variable 11: -22.691 1.800 6 1.84666 23.8 12: 47.733 5.362 7 1.49700 81.6 13: -22.885 0.300 14: -172.889 3.106 8 1.62041 60.3 15: -41.903 3.304 16: 420.149 2.947 9 1.64958 48.1 17: -93.858 Variable 18: 46.270 4.584 10 1.72342 38.0 19: -249.265 5.000 20: ∞ 25.300 11 1.51680 64.2 21: ∞ 8.694 IMG: ∞ 0.000 Aspherical surface The surface marked with (*) is an aspherical surface, and the aspherical surface coefficients are as follows. K = -0.145477, A = -0.161405E-04, B = -0.122805E-06, C = 0.410606E-09, D = -0.338498E-11 The 20th and 21st surfaces are the surfaces of the color combining prism. . Variable amount Focal length 20.261 22.413 24.552 D5 3.288 3.258 3.312 D7 13.578 7.483 1.897 D10 15.098 16.429 17.901 D17 2.734 7.528 11.588 Value of each parameter in the conditional expression: fw / | f 1 | = 1.38 | f 1 | / f 2 = 0 .48 fw / f 3 = 0.36 fw / f 5 = 0.38.

【００４１】実施例２のレンズの、広角端における断面
図を図９に、望遠端における断面図を図１０に示す。ま
た、実施例２のレンズの、広角端における縦収差図を図
１１、望遠端における縦収差図を図１２、広角端におけ
る横収差図を図１３、望遠端における横収差図を図１４
にそれぞれ示す。A sectional view of the lens of the second embodiment at the wide-angle end is shown in FIG. 9, and a sectional view at the telephoto end is shown in FIG. Further, FIG. 11 is a longitudinal aberration diagram at the wide-angle end of the lens of Example 2, FIG. 12 is a longitudinal aberration diagram at the telephoto end, FIG. 13 is a lateral aberration diagram at the wide-angle end, and FIG. 14 is a lateral aberration diagram at the telephoto end.
Are shown respectively.

【００４２】 実施例３ ｉ Ｒｉ Ｄｉ ｊ Ｎｊ νｊ 0: ∞ 2200.000 1: 31.906 3.881 1 1.60039 54.8 2: 19.707 0.050 2 1.52020 52.1 3: 16.864（＊） 8.100 4: 361.009 1.800 3 1.62041 60.3 5: 26.234 可変 6: 57.891 2.766 4 1.83400 37.3 7: 306.887 可変 8: 30.338 3.169 5 1.74595 40.3 9: 469.717 6.137 10（絞り） ∞ 可変 11: -21.039 1.825 6 1.84666 23.8 12: 37.805 6.000 7 1.49700 81.6 13: -23.979 0.300 14: -41.272 4.657 8 1.62041 60.3 15: -30.052 0.300 16: 292.702 3.112 9 1.74400 44.9 17: -74.050 可変 18: 38.820 4.316 10 1.72342 38.0 19: -5385.813 5.000 20: ∞ 25.300 11 1.51680 64.2 21: ∞ 8.699 IMG: ∞ 0.000 非球面 （＊）印を付した面が非球面であり、非球面係数は以下のとおりである。 K= 0.001007，A=-0.917321E-05，B=-0.110321E-06，C= 0.459880E-09， D=-0.201970E-11 第２０面、第２１面は，色合成プリズムの面を示す。[0042]   Example 3      i Ri Di j Nj νj      0: ∞ 2200.000      1: 31.906 3.881 1 1.60039 54.8      2: 19.707 0.050 2 1.52020 52.1      3: 16.864 (*) 8.100      4: 361.009 1.800 3 1.62041 60.3      5: 26.234 variable      6: 57.891 2.766 4 1.83400 37.3      7: 306.887 variable      8: 30.338 3.169 5 1.74595 40.3      9: 469.717 6.137     10 (Aperture) ∞ Variable     11: -21.039 1.825 6 1.84666 23.8     12: 37.805 6.000 7 1.49700 81.6     13: -23.979 0.300     14: -41.272 4.657 8 1.62041 60.3     15: -30.052 0.300     16: 292.702 3.112 9 1.74400 44.9     17: -74.050 Variable     18: 38.820 4.316 10 1.72342 38.0     19: -5385.813 5.000     20: ∞ 25.300 11 1.51680 64.2     21: ∞ 8.699    IMG: ∞ 0.000   Aspherical surface   The surface marked with (*) is an aspherical surface, and the aspherical surface coefficients are as follows.   K = 0.001007, A = -0.917321E-05, B = -0.110321E-06, C = 0.459880E-09,   D = -0.201970E-11   The 20th surface and the 21st surface are surfaces of the color combining prism.

【００４３】 可変量 焦点距離 20.261 22.449 24.590 Ｄ５ 12.130 12.542 13.119 Ｄ７ 12.584 6.562 1.000 Ｄ１０ 14.874 15.887 17.093 Ｄ１７ 1.000 5.596 9.376 条件式の各パラメータの値： ｆｗ／｜ｆ１｜＝０．７８ ｜ｆ１｜／ｆ２＝０．３１ ｆｗ／ｆ３＝０．４７ ｆｗ／ｆ５＝０．３８ 。Variable amount Focal length 20.261 22.449 24.590 D5 12.130 12.542 13.119 D7 12.584 6.562 1.000 D10 14.874 15.887 17.093 D17 1.000 5.596 9.376 Value of each parameter of the conditional expression: fw / | f 1 | = 0.78 | f 1 | / f 2 = 0.31 fw / f 3 = 0.47 fw / f 5 = 0.38.

【００４４】実施例３のレンズの、広角端における断面
図を図１５に、望遠端における断面図を図１６に示す。
また、実施例３のレンズの、広角端における縦収差図を
図１７、望遠端における縦収差図を図１８、広角端にお
ける横収差図を図１９、望遠端における横収差図を図２
０にそれぞれ示す。FIG. 15 shows a sectional view of the lens of Example 3 at the wide-angle end, and FIG. 16 shows a sectional view at the telephoto end.
Further, FIG. 17 is a longitudinal aberration diagram at the wide-angle end, FIG. 18 is a longitudinal aberration diagram at the telephoto end, FIG. 19 is a lateral aberration diagram at the wide-angle end, and FIG.
0 is shown respectively.

【００４５】 実施例４ ｉ Ｒｉ Ｄｉ ｊ Ｎｊ νｊ 0: ∞ 2200.000 1: 101.909 1.600 1 1.59089 39.9 2: 20.056 0.192 2 1.52020 52.0 3: 18.862（＊） 6.570 4: -299.280 1.600 3 1.51680 64.2 5: 41.088 可変 6: 69.248 3.422 4 1.83400 37.3 7: -232.767 可変 8: 33.501 4.238 5 1.74397 44.9 9: -340.337 9.494 10（絞り） ∞ 可変 11: -20.716 2.349 6 1.84666 23.8 12: 37.214 5.783 7 1.49700 81.6 13: -21.922 6.383 14: -1009.853 3.679 8 1.74430 44.0 15: -48.438 可変 16: 42.982 4.759 9 1.74950 35.3 17: -24954.220 5.000 18: ∞ 25.300 10 1.51680 64.2 19: ∞ 8.700 IMG: ∞ 0.000 非球面 （＊）印を付した面が非球面であり、非球面係数は以下のとおりである。 K=-0.817954，A= 0.571226E-05，B=-0.406228E-07，C= 0.471796E-09， D=-0.261004E-11，E= 0.631208E-14，F=-0.408556E-17 第１８面、第１９面は色合成プリズムの面を示す。[0045]   Example 4      i Ri Di j Nj νj      0: ∞ 2200.000      1: 101.909 1.600 1 1.59089 39.9      2: 20.056 0.192 2 1.52020 52.0      3: 18.862 (*) 6.570      4: -299.280 1.600 3 1.51680 64.2      5: 41.088 variable      6: 69.248 3.422 4 1.83400 37.3      7: -232.767 variable      8: 33.501 4.238 5 1.74397 44.9      9: -340.337 9.494     10 (Aperture) ∞ Variable     11: -20.716 2.349 6 1.84666 23.8     12: 37.214 5.783 7 1.49700 81.6     13: -21.922 6.383     14: -1009.853 3.679 8 1.74430 44.0     15: -48.438 Variable     16: 42.982 4.759 9 1.74950 35.3     17: -24954.220 5.000     18: ∞ 25.300 10 1.51680 64.2     19: ∞ 8.700    IMG: ∞ 0.000   Aspherical surface   The surface marked with (*) is an aspherical surface, and the aspherical surface coefficients are as follows.   K = -0.817954, A = 0.571226E-05, B = -0.406228E-07, C = 0.471796E-09,   D = -0.261004E-11, E = 0.631208E-14, F = -0.408556E-17   The 18th and 19th surfaces are the surfaces of the color combining prism.

【００４６】 可変量 焦点距離 26.258 28.766 31.523 Ｄ５ 8.060 8.168 8.433 Ｄ７ 11.409 6.322 1.000 Ｄ１０ 14.249 15.244 16.252 Ｄ１５ 3.212 7.197 11.245 条件式の各パラメータの値： ｆｗ／｜ｆ１｜＝１．１１ ｜ｆ１｜／ｆ２＝０．３７ ｆｗ／ｆ３＝０．６４ ｆｗ／ｆ５＝０．４６ 。Variable amount Focal length 26.258 28.766 31.523 D5 8.060 8.168 8.433 D7 11.409 6.322 1.000 D10 14.249 15.244 16.252 D15 3.212 7.197 11.245 Value of each parameter of the conditional expression: fw / | f 1 | = 1.11 | f 1 | / f 2 = 0.37 fw / f 3 = 0.64 fw / f 5 = 0.46.

【００４７】実施例４のレンズの、広角端における断面
図を図２１に、望遠端における断面図を図２２に示す。
また、実施例４のレンズの、広角端における縦収差図を
図２３、望遠端における縦収差図を図２４、広角端にお
ける横収差図を図２５、望遠端における横収差図を図２
６にそれぞれ示す。A sectional view of the lens of Example 4 at the wide-angle end is shown in FIG. 21, and a sectional view at the telephoto end is shown in FIG.
23 is a longitudinal aberration diagram at the wide-angle end, FIG. 24 is a longitudinal aberration diagram at the telephoto end, FIG. 25 is a lateral aberration diagram at the wide-angle end, and FIG.
6 respectively.

【００４８】 実施例５ ｉ Ｒｉ Ｄｉ ｊ Ｎｊ νｊ 0: ∞ 2200.000 1: 113.998 1.600 1 1.71331 33.6 2: 23.525 0.050 2 1.52020 52.0 3: 19.992（＊） 6.486 4: -124.271 1.600 3 1.51680 64.2 5: 35.021 可変 6: 54.088 4.676 4 1.83400 37.3 7: -96.476 可変 8: 33.029 3.702 5 1.72114 46.8 9: 627.730 10.626 10（絞り） ∞ 可変 11: -21.771 2.080 6 1.84666 23.8 12: 35.199 5.607 7 1.49700 81.6 13: -22.169 7.176 14: 263.585 3.762 8 1.74397 44.9 15: -59.053 可変 16: 47.526 4.646 9 1.74950 35.3 17: -535.814 5.000 18: ∞ 25.300 10 1.51680 64.2 19: ∞ 8.698 IMG: ∞ 0.000 非球面 （＊）印を付した面が非球面であり、非球面係数は以下のとおりである。 K = -0.964078，A= 0.327579E-05，B=-0.446478E-07，C= 0.448120E-09， D=-0.257618E-11，E= 0.684980E-14，F=-0.613574E-17 第１８面、第１９面は色合成プリズムの面を示す。[0048]   Example 5      i Ri Di j Nj νj      0: ∞ 2200.000      1: 113.998 1.600 1 1.71331 33.6      2: 23.525 0.050 2 1.52020 52.0      3: 19.992 (*) 6.486      4: -124.271 1.600 3 1.51680 64.2      5: 35.021 variable      6: 54.088 4.676 4 1.83400 37.3      7: -96.476 Variable      8: 33.029 3.702 5 1.72114 46.8      9: 627.730 10.626     10 (Aperture) ∞ Variable     11: -21.771 2.080 6 1.84666 23.8     12: 35.199 5.607 7 1.49700 81.6     13: -22.169 7.176     14: 263.585 3.762 8 1.74397 44.9     15: -59.053 Variable     16: 47.526 4.646 9 1.74950 35.3     17: -535.814 5.000     18: ∞ 25.300 10 1.51680 64.2     19: ∞ 8.698    IMG: ∞ 0.000   Aspherical surface   The surface marked with (*) is an aspherical surface, and the aspherical surface coefficients are as follows.   K = -0.964078, A = 0.327579E-05, B = -0.446478E-07, C = 0.448120E-09,   D = -0.257618E-11, E = 0.684980E-14, F = -0.613574E-17   The 18th and 19th surfaces are the surfaces of the color combining prism.

【００４９】 可変量 焦点距離 26.253 28.761 31.518 Ｄ５ 6.689 6.387 6.215 Ｄ７ 11.853 6.479 1.000 Ｄ１０ 13.680 14.714 15.798 Ｄ１５ 2.767 7.410 11.975 条件式の各パラメータの値： ｆｗ／｜ｆ１｜＝１．３３ ｜ｆ１｜／ｆ２＝０．４７ ｆｗ／ｆ３＝０．５５ ｆｗ／ｆ５＝０．４５ 。Variable amount Focal length 26.253 28.761 31.518 D5 6.689 6.387 6.215 D7 11.853 6.479 1.000 D10 13.680 14.714 15.798 D15 2.767 7.410 11.975 Value of each parameter of the conditional expression: fw / | f 1 | = 1.33 | f 1 | / f 2 = 0.47 fw / f 3 = 0.55 fw / f 5 = 0.45.

【００５０】実施例５のレンズの、広角端における断面
図を図２７に、望遠端における断面図を図２８に示す。
また、実施例５のレンズの、広角端における縦収差図を
図２９、望遠端における縦収差図を図３０、広角端にお
ける横収差図を図３１、望遠端における横収差図を図３
２にそれぞれ示す。FIG. 27 shows a sectional view of the lens of Example 5 at the wide-angle end, and FIG. 28 shows a sectional view thereof at the telephoto end.
29 is a longitudinal aberration diagram at the wide-angle end, FIG. 30 is a longitudinal aberration diagram at the telephoto end, FIG. 31 is a lateral aberration diagram at the wide-angle end, and FIG. 3 is a lateral aberration diagram at the telephoto end.
2 respectively.

【００５１】 実施例６ ｉ Ｒｉ Ｄｉ ｊ Ｎｊ νｊ 0: ∞ 2200.000 1: -5569.877 1.600 1 1.65468 47.1 2: 21.504 0.050 2 1.52020 52.0 3: 18.390（＊） 6.020 4: 384.000 1.600 3 1.51680 64.2 5: 38.097 可変 6: 52.281 4.839 4 1.83400 37.3 7: -117.692 可変 8: 33.439 5.894 5 1.73571 45.5 9: -513.280 9.350 10（絞り） ∞ 可変 11: -25.451 3.300 6 1.84666 23.8 12: 28.080 5.414 7 1.49700 81.6 13: -23.366 13.527 14: 369.307 3.671 8 1.74420 44.3 15: -66.254 可変 16: 46.832 4.477 9 1.74950 35.3 17: -24963.768 5.000 18: ∞ 25.300 10 1.51680 64.2 19: ∞ 8.708 IMG: ∞ 0.000 非球面 （＊）印を付した面が非球面であり、非球面係数は以下のとおりである。 K=-1.101050，A= 0.119956E-05，B=-0.247068E-07，C= 0.240040E-09， D=-0.217442E-11，E= 0.108779E-13，F=-0.210411E-16 第１８面、第１９面は色合成プリズムの面を示す。[0051]   Example 6      i Ri Di j Nj νj      0: ∞ 2200.000      1: -5569.877 1.600 1 1.65468 47.1      2: 21.504 0.050 2 1.52020 52.0      3: 18.390 (*) 6.020      4: 384.000 1.600 3 1.51680 64.2      5: 38.097 variable      6: 52.281 4.839 4 1.83400 37.3      7: -117.692 Variable      8: 33.439 5.894 5 1.73571 45.5      9: -513.280 9.350     10 (Aperture) ∞ Variable     11: -25.451 3.300 6 1.84666 23.8     12: 28.080 5.414 7 1.49700 81.6     13: -23.366 13.527     14: 369.307 3.671 8 1.74420 44.3     15: -66.254 Variable     16: 46.832 4.477 9 1.74950 35.3     17: -24963.768 5.000     18: ∞ 25.300 10 1.51680 64.2     19: ∞ 8.708    IMG: ∞ 0.000   Aspherical surface   The surface marked with (*) is an aspherical surface, and the aspherical surface coefficients are as follows.   K = -1.101050, A = 0.119956E-05, B = -0.247068E-07, C = 0.240040E-09,   D = -0.217442E-11, E = 0.108779E-13, F = -0.210411E-16   The 18th and 19th surfaces are the surfaces of the color combining prism.

【００５２】 可変量 焦点距離 26.260 28.766 31.519 Ｄ５ 6.351 5.947 5.707 Ｄ７ 10.931 6.053 1.000 Ｄ１０ 8.976 9.997 10.990 Ｄ１５ 1.000 5.261 9.561 条件式の各パラメータの値： ｆｗ／｜ｆ１｜＝１．３２ ｜ｆ１｜／ｆ２＝０．４６ ｆｗ／ｆ３＝０．６１ ｆｗ／ｆ５＝０．４２ 。Variable amount Focal length 26.260 28.766 31.519 D5 6.351 5.947 5.707 D7 10.931 6.053 1.000 D10 8.976 9.997 10.990 D15 1.000 5.261 9.561 Value of each parameter of the conditional expression: fw / | f 1 | = 1.32 | f 1 | / f 2 = 0.46 fw / f 3 = 0.61 fw / f 5 = 0.42.

【００５３】実施例６のレンズの、広角端における断面
図を図３３に、望遠端における断面図を図３４に示す。
また、実施例６のレンズの、広角端における縦収差図を
図３５、望遠端における縦収差図を図３６、広角端にお
ける横収差図を図３７、望遠端における横収差図を図３
８にそれぞれ示す。FIG. 33 shows a sectional view of the lens of Example 6 at the wide-angle end, and FIG. 34 shows a sectional view thereof at the telephoto end.
35 is a longitudinal aberration diagram at the wide-angle end, FIG. 36 is a longitudinal aberration diagram at the telephoto end, FIG. 37 is a lateral aberration diagram at the wide-angle end, and FIG. 3 is a lateral aberration diagram at the telephoto end.
8 respectively.

【００５４】実施例１、２、３に関する各収差図におい
て、「Ｇ」は波長：５５０．０ｎｍでの収差、「Ｒ」は
波長：６２０．０ｎｍでの収差、「Ｂ」は波長：４６
０．０ｎｍでの収差を示し、実施例４、５、６に関する
各収差図において、「Ｇ」は波長：５５０．０ｎｍでの
収差、「Ｒ」は波長：６１０．０ｎｍでの収差、「Ｂ」
は波長：４６０．０ｎｍでの収差を示す。In each of the aberration diagrams relating to Examples 1, 2, and 3, "G" is an aberration at a wavelength of 550.0 nm, "R" is an aberration at a wavelength: 620.0 nm, and "B" is a wavelength: 46.
Aberrations at 0.0 nm are shown, and in each aberration diagram relating to Examples 4, 5, and 6, "G" is an aberration at a wavelength: 550.0 nm, "R" is an aberration at a wavelength: 610.0 nm, and "B" is "
Indicates aberration at a wavelength of 460.0 nm.

【００５５】また、実施例１〜６に関する各収差図にお
いて、「Ｓ」は波長：５５０．０ｎｍでのサジタル像
面、「Ｔ」は波長：５５０．０ｎｍでのタンジェンシァ
ル像面を示す。In each aberration diagram of Examples 1 to 6, "S" indicates a sagittal image plane at a wavelength of 550.0 nm, and "T" indicates a tangential image plane at a wavelength of 550.0 nm.

【００５６】変倍に伴なう第２群Ｇ２〜第４群Ｇ４の変
位の方向および大きさは、各実施例における可変量に示
された面間隔により明らかであるが、「各群の移動は単
調」に行われる。The directions and magnitudes of the displacements of the second group G2 to the fourth group G4 due to the magnification change are apparent from the surface distances shown in the variable amounts in each example. Is monotonous.

【００５７】上に挙げた実施例１〜６は「平面画像を拡
大して投射結像させる投射用ズームレンズ」であって、
実施例１〜３は、拡大側から順に、負の屈折力の第１群
Ｇ１、正の屈折力の第２群Ｇ２、正の屈折力の第３群Ｇ
３、正の屈折力の第４群Ｇ４、正の屈折力の第５群Ｇ５
を配し、第３、第４群間に絞りＳを有してなり、投射距
離を変化させる際、平面画像と投射像とを共役に保つた
めに第１群Ｇ１が光軸方向に移動を行い、変倍に際し、
第１群Ｇ１及び第５群Ｇ５が固定で、第２群Ｇ２、第３
群Ｇ３、及び、第４群Ｇ４が光軸方向に移動を行い、第
１群の焦点距離：ｆ１、第２群の焦点距離：ｆ２、第３
群の焦点距離：ｆ３、第５群の焦点距離：ｆ５、広角端
における全系の焦点距離：ｆｗが、条件： （１） ０．７６＜ｆｗ／｜ｆ１｜＜１．４９ （２） ０．２８＜｜ｆ１｜／ｆ２＜０．５０ （３） ０．３４＜ｆｗ／ｆ３＜０．５０ （４） ０．２２＜ｆｗ／ｆ５＜０．４０ を満足するものである（請求項１）。Examples 1 to 6 listed above are "projection zoom lenses for enlarging and projecting a two-dimensional image for projection".
In Examples 1 to 3, in order from the enlargement side, the first group G1 having negative refractive power, the second group G2 having positive refractive power, and the third group G having positive refractive power.
3, fourth group G4 having positive refractive power, fifth group G5 having positive refractive power
And a stop S between the third and fourth groups, and when changing the projection distance, the first group G1 moves in the optical axis direction in order to keep the plane image and the projected image conjugate. When performing zooming,
The first group G1 and the fifth group G5 are fixed, and the second group G2 and the third group
The group G3 and the fourth group G4 move in the optical axis direction, and the focal length of the first group: f 1 , the focal length of the second group: f 2 , the third group
The focal length of the group is f 3 , the focal length of the fifth group is f 5 , and the focal length of the entire system at the wide-angle end is fw, the conditions are: (1) 0.76 <fw / | f 1 | <1.49 ( 2) 0.28 <| f 1 | / f 2 <0.50 (3) 0.34 <fw / f 3 <0.50 (4) 0.22 <fw / f 5 <0.40 (Claim 1).

【００５８】また、実施例４〜６は、拡大側から順に、
負の屈折力の第１群Ｇ１、正の屈折力の第２群Ｇ２、正
の屈折力の第３群Ｇ３、負の屈折力の第４群Ｇ４、正の
屈折力の第５群Ｇ５を配し、第３、第４群間に絞りＳを
有してなり、投射距離を変化させる際、平面画像と投射
像とを共役に保つために第１群Ｇ１が光軸方向に移動を
行い、変倍に際し、第１群Ｇ１及び第５群Ｇ５が固定
で、第２群Ｇ２、第３群Ｇ３、及び、第４群Ｇ４が光軸
方向に移動を行い、第１群の焦点距離：ｆ１、第２群の
焦点距離：ｆ２、第３群の焦点距離：ｆ３、第５群の焦
点距離：ｆ５、広角端における全系の焦点距離：ｆｗ
が、条件： （５） １．１０＜ｆｗ／｜ｆ１｜＜１．３５ （６） ０．３６＜｜ｆ１｜／ｆ２＜０．４９ （７） ０．５３＜ｆｗ／ｆ３＜０．６７ （８） ０．４１＜ｆｗ／ｆ５＜０．４９ を満足するものである（請求項２）。Further, in Examples 4 to 6, in order from the enlargement side,
A negative refractive power first group G1, a positive refractive power second group G2, a positive refractive power third group G3, a negative refractive power fourth group G4, and a positive refractive power fifth group G5. The first group G1 moves in the optical axis direction in order to keep the plane image and the projected image conjugate when changing the projection distance. During zooming, the first group G1 and the fifth group G5 are fixed, the second group G2, the third group G3, and the fourth group G4 move in the optical axis direction, and the focal length of the first group: f 1 , the focal length of the second group: f 2 , the focal length of the third group: f 3 , the focal length of the fifth group: f 5 , the focal length of the entire system at the wide-angle end: fw
However, the conditions are: (5) 1.10 <fw / | f 1 | <1.35 (6) 0.36 <| f 1 | / f 2 <0.49 (7) 0.53 <fw / f 3 <0.67 (8) 0.41 <fw / f 5 <0.49 is satisfied (Claim 2).

【００５９】そして、実施例１〜６とも、第１群Ｇ１を
構成するレンズ中の少なくとも１面が非球面であり（請
求項３、５）、第３群Ｇ３が、屈折率：１．７以上の材
質による１枚のレンズで構成されている（請求項４）。In each of Examples 1 to 6, at least one surface of the lenses constituting the first group G1 is aspherical (claims 3 and 5), and the third group G3 has a refractive index of 1.7. It is composed of one lens made of the above materials (claim 4).

【００６０】各収差図に見られるように、実施例１〜６
の何れにおいても、広角端、望遠端において縦収差・横
収差ともに良好に補正され、性能良好であり、色合成手
段である色合成プリズム配設のための十分に大きなバッ
クフォーカスを有している。実施例１〜６とも、第１群
の最も拡大側にあるレンズ（拡大側から数えて第１番目
のレンズ）は、ハイブリッドレンズとして構成され、非
球面は何れも、この第１番目のレンズの縮小側のレンズ
面に貼着された樹脂膜（第２番目のレンズ）の縮小側の
面として形成されている。このように非球面を有するレ
ンズをハイブリッドレンズとすることも、投射用ズーム
レンズの低コスト化に有効である。As can be seen from the respective aberration diagrams, Examples 1 to 6
In both cases, the longitudinal and lateral aberrations are well corrected at the wide-angle end and the telephoto end, the performance is good, and the back focus is sufficiently large for the color synthesizing prism as the color synthesizing means. . In each of Examples 1 to 6, the lens on the most magnification side of the first group (the first lens counted from the magnification side) is configured as a hybrid lens, and all aspherical surfaces are the same as those of the first lens. It is formed as the reduction side surface of the resin film (second lens) attached to the reduction side lens surface. Using a lens having an aspherical surface as a hybrid lens is also effective in reducing the cost of the projection zoom lens.

【００６１】また、各実施例とも、８枚（実施例４、
５、６）〜９枚（実施例１、２、３）構成（何れも１枚
はハイブリッドレンズ）と少ないレンズ枚数で構成さ
れ、コンパクトであり、安価に実現可能である。Further, in each of the embodiments, 8 sheets (Example 4,
5, 6) to 9 elements (Embodiments 1, 2, and 3) (all one element is a hybrid lens) and a small number of lenses, compact, and inexpensive.

【００６２】[0062]

【発明の効果】以上に説明したように、この発明によれ
ば新規な投射用ズームレンズを提供できる。この発明の
投射用ズームレンズは、上記各実施例に見られるよう
に、少ないレンズ枚数で安価且つコンパクトに実現で
き、なお且つ性能良好であって、投射用ズームレンズに
要請される諸属性をきわめて良好に実現できている。As described above, according to the present invention, a novel projection zoom lens can be provided. The projection zoom lens of the present invention can be realized inexpensively and compactly with a small number of lenses as shown in each of the above-mentioned embodiments, has good performance, and has various attributes required for the projection zoom lens. It has been successfully realized.

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

【図１】請求項１記載の投射用ズームレンズの１例の断
面図を示す図である。FIG. 1 is a diagram showing a sectional view of an example of a projection zoom lens according to a first aspect of the invention.

【図２】請求項２記載の投射用ズームレンズの１例の断
面図を示す図である。FIG. 2 is a diagram showing a cross-sectional view of an example of the projection zoom lens according to claim 2;

【図３】実施例１の投射用ズームレンズの広角端におけ
る断面図を示す図である。FIG. 3 is a diagram illustrating a cross-sectional view at the wide-angle end of the projection zoom lens according to the first exemplary embodiment.

【図４】実施例１の投射用ズームレンズの望遠端におけ
る断面図を示す図である。FIG. 4 is a diagram illustrating a cross-sectional view at the telephoto end of the projection zoom lens according to the first exemplary embodiment.

【図５】実施例１の投射用ズームレンズの広角端におけ
る縦収差図である。5 is a longitudinal aberration diagram at the wide-angle end of the projection zoom lens of Example 1. FIG.

【図６】実施例１の投射用ズームレンズの望遠端におけ
る縦収差図である。FIG. 6 is a longitudinal aberration diagram at the telephoto end of the projection zoom lens of Example 1;

【図７】実施例１の投射用ズームレンズの広角端におけ
る横収差図である。FIG. 7 is a lateral aberration diagram at a wide-angle end of the projection zoom lens according to the first exemplary embodiment.

【図８】実施例１の投射用ズームレンズの望遠端におけ
る横収差図である。8 is a lateral aberration diagram at the telephoto end of the projection zoom lens of Example 1. FIG.

【図９】実施例２の投射用ズームレンズの広角端におけ
る断面図を示す図である。FIG. 9 is a diagram showing a cross-sectional view at the wide-angle end of the projection zoom lens of Example 2;

【図１０】実施例２の投射用ズームレンズの望遠端にお
ける断面図を示す図である。FIG. 10 is a diagram showing a cross-sectional view at the telephoto end of the projection zoom lens of Example 2;

【図１１】実施例２の投射用ズームレンズの広角端にお
ける縦収差図である。FIG. 11 is a longitudinal aberration diagram at a wide-angle end of the projection zoom lens of Example 2;

【図１２】実施例２の投射用ズームレンズの望遠端にお
ける縦収差図である。FIG. 12 is a longitudinal aberration diagram at a telephoto end of a projection zoom lens according to a second example.

【図１３】実施例２の投射用ズームレンズの広角端にお
ける横収差図である。FIG. 13 is a lateral aberration diagram at a wide-angle end of the projection zoom lens of Example 2;

【図１４】実施例２の投射用ズームレンズの望遠端にお
ける横収差図である。14 is a lateral aberration diagram at the telephoto end of the projection zoom lens of Example 2. FIG.

【図１５】実施例３の投射用ズームレンズの広角端にお
ける断面図を示す図である。FIG. 15 is a diagram showing a cross-sectional view at the wide-angle end of the projection zoom lens of Example 3;

【図１６】実施例３の投射用ズームレンズの望遠端にお
ける断面図を示す図である。FIG. 16 is a diagram showing a cross-sectional view at the telephoto end of the projection zoom lens of Example 3;

【図１７】実施例３の投射用ズームレンズの広角端にお
ける縦収差図である。FIG. 17 is a longitudinal aberration diagram at a wide angle end of the projection zoom lens according to the third example.

【図１８】実施例３の投射用ズームレンズの望遠端にお
ける縦収差図である。FIG. 18 is a longitudinal aberration diagram at a telephoto end of the projection zoom lens according to the third example.

【図１９】実施例３の投射用ズームレンズの広角端にお
ける横収差図である。FIG. 19 is a lateral aberration diagram at a wide-angle end of the projection zoom lens according to the third example.

【図２０】実施例３の投射用ズームレンズの望遠端にお
ける横収差図である。FIG. 20 is a lateral aberration diagram at a telephoto limit of the projection zoom lens according to the third example.

【図２１】実施例４の投射用ズームレンズの広角端にお
ける断面図を示す図である。FIG. 21 is a diagram showing a cross-sectional view at the wide-angle end of the projection zoom lens of Example 4;

【図２２】実施例４の投射用ズームレンズの望遠端にお
ける断面図を示す図である。FIG. 22 is a diagram showing a cross-sectional view at the telephoto end of the projection zoom lens of Example 4;

【図２３】実施例４の投射用ズームレンズの広角端にお
ける縦収差図である。23 is a longitudinal aberration diagram at the wide-angle end of the projection zoom lens of Example 4. FIG.

【図２４】実施例４の投射用ズームレンズの望遠端にお
ける縦収差図である。FIG. 24 is a longitudinal aberration diagram at a telephoto end of the projection zoom lens according to the fourth example.

【図２５】実施例４の投射用ズームレンズの広角端にお
ける横収差図である。FIG. 25 is a lateral aberration diagram at a wide-angle end of the projection zoom lens according to the fourth example.

【図２６】実施例４の投射用ズームレンズの望遠端にお
ける横収差図である。FIG. 26 is a lateral aberration diagram at a telephoto end of the projection zoom lens according to the fourth example.

【図２７】実施例５の投射用ズームレンズの広角端にお
ける断面図を示す図である。FIG. 27 is a diagram showing a cross-sectional view at the wide-angle end of the projection zoom lens of Example 5;

【図２８】実施例５の投射用ズームレンズの望遠端にお
ける断面図を示す図である。FIG. 28 is a diagram showing a cross-sectional view at the telephoto end of the projection zoom lens of Example 5;

【図２９】実施例５の投射用ズームレンズの広角端にお
ける縦収差図である。FIG. 29 is a longitudinal aberration diagram at a wide-angle end of the projection zoom lens according to the fifth example.

【図３０】実施例５の投射用ズームレンズの望遠端にお
ける縦収差図である。FIG. 30 is a longitudinal aberration diagram at a telephoto end of the projection zoom lens according to the fifth example.

【図３１】実施例５の投射用ズームレンズの広角端にお
ける横収差図である。FIG. 31 is a lateral aberration diagram at a wide-angle end of the projection zoom lens according to the fifth example.

【図３２】実施例５の投射用ズームレンズの望遠端にお
ける横収差図である。FIG. 32 is a lateral aberration diagram at a telephoto end of the projection zoom lens according to the fifth example.

【図３３】実施例６の投射用ズームレンズの広角端にお
ける断面図を示す図である。FIG. 33 is a diagram showing a cross-sectional view at the wide-angle end of the projection zoom lens of Example 6;

【図３４】実施例６の投射用ズームレンズの望遠端にお
ける断面図を示す図である。FIG. 34 is a diagram showing a cross-sectional view at the telephoto end of the projection zoom lens of Example 6;

【図３５】実施例６の投射用ズームレンズの広角端にお
ける縦収差図である。FIG. 35 is a longitudinal aberration diagram at a wide angle end of the projection zoom lens according to the sixth example.

【図３６】実施例６の投射用ズームレンズの望遠端にお
ける縦収差図である。FIG. 36 is a longitudinal aberration diagram at a telephoto end of the projection zoom lens according to the sixth example.

【図３７】実施例６の投射用ズームレンズの広角端にお
ける横収差図である。FIG. 37 is a lateral aberration diagram at a wide-angle end of the projection zoom lens according to the sixth example.

【図３８】実施例６の投射用ズームレンズの望遠端にお
ける横収差図である。38 is a lateral aberration diagram at the telephoto end of the projection zoom lens according to Example 6; FIG.

【符号の説明】[Explanation of symbols]

Ｇ１ 第１群 Ｇ２ 第２群 Ｇ３ 第３群 Ｇ４ 第４群 Ｇ５ 第５群 Ｓ 絞り ＰＲ 色合成プリズム（色合成手段） G1 first group G2 second group G3 Third group G4 4th group G5 Fifth group S aperture PR color synthesis prism (color synthesis means)

───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2H087 KA06 MA12 NA02 PA07 PA08 PA19 PB09 PB10 QA02 QA03 QA07 QA17 QA19 QA22 QA26 QA34 QA41 QA45 RA05 RA12 RA36 RA41 SA44 SA46 SA49 SA52 SA53 SA55 SA63 SA64 SA65 SA72 SA76 SB04 SB12 SB22 SB34 SB35 SB42    ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2H087 KA06 MA12 NA02 PA07 PA08                       PA19 PB09 PB10 QA02 QA03                       QA07 QA17 QA19 QA22 QA26                       QA34 QA41 QA45 RA05 RA12                       RA36 RA41 SA44 SA46 SA49                       SA52 SA53 SA55 SA63 SA64                       SA65 SA72 SA76 SB04 SB12                       SB22 SB34 SB35 SB42

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】平面画像を拡大して投射結像させる投射用
ズームレンズであって、 拡大側から順に、負の屈折力の第１群、正の屈折力の第
２群、正の屈折力の第３群、正の屈折力の第４群、正の
屈折力の第５群を配し、第３、第４群間に絞りを有して
なり、 投射距離を変化させる際、平面画像と投射像とを共役に
保つために第１群が光軸方向に移動を行い、 変倍に際し、第１群及び第５群が固定で、第２群、第３
群、及び、第４群が光軸方向に移動を行い、 第１群の焦点距離：ｆ１、第２群の焦点距離：ｆ２、第
３群の焦点距離：ｆ３、第５群の焦点距離：ｆ５、広角
端における全系の焦点距離：ｆｗが、条件： （１） ０．７６＜ｆｗ／｜ｆ１｜＜１．４９ （２） ０．２８＜｜ｆ１｜／ｆ２＜０．５０ （３） ０．３４＜ｆｗ／ｆ３＜０．５０ （４） ０．２２＜ｆｗ／ｆ５＜０．４０ を満足することを特徴とする投射用ズームレンズ。1. A zoom lens for projection for enlarging and projecting a two-dimensional image for projection, comprising: a first group of negative refracting power, a second group of positive refracting power, and a positive refracting power in order from the enlarging side. The third lens group, the fourth lens group having a positive refractive power, and the fifth lens group having a positive refractive power are arranged, and an aperture is provided between the third lens group and the fourth lens group. In order to keep the projection image and the projected image conjugate, the first group moves in the optical axis direction, and during zooming, the first and fifth groups are fixed, and the second and third groups are fixed.
Group, and the fourth group performs a movement in the direction of the optical axis, the focal length of the first group: f 1, the focal length of the second lens group: f 2, a focal length of the third group: f 3, the fifth group The focal length is f 5 , the focal length of the entire system at the wide-angle end is fw, and the conditions are: (1) 0.76 <fw / | f 1 | <1.49 (2) 0.28 <| f 1 | / f A projection zoom lens satisfying 2 <0.50 (3) 0.34 <fw / f 3 <0.50 (4) 0.22 <fw / f 5 <0.40. 【請求項２】平面画像を拡大して投射結像させる投射用
ズームレンズであって、 拡大側から順に、負の屈折力の第１群、正の屈折力の第
２群、正の屈折力の第３群、負の屈折力の第４群、正の
屈折力の第５群を配し、第３、第４群間に絞りを有して
なり、 投射距離を変化させる際、平面画像と投射像とを共役に
保つために第１群が光軸方向に移動を行い、 変倍に際し、第１群及び第５群が固定で、第２群、第３
群、及び、第４群が光軸方向に移動を行い、 第１群の焦点距離：ｆ１、第２群の焦点距離：ｆ２、第
３群の焦点距離：ｆ３、第５群の焦点距離：ｆ５、広角
端における全系の焦点距離：ｆｗが、条件： （５） １．１０＜ｆｗ／｜ｆ１｜＜１．３５ （６） ０．３６＜｜ｆ１｜／ｆ２＜０．４９ （７） ０．５３＜ｆｗ／ｆ３＜０．６７ （８） ０．４１＜ｆｗ／ｆ５＜０．４９ を満足することを特徴とする投射用ズームレンズ。2. A projection zoom lens for enlarging and projecting a two-dimensional image to form an image, the first group having negative refracting power, the second group having positive refracting power, and the positive refracting power in order from the enlarging side. The third group of, the fourth group of negative refractive power, and the fifth group of positive refractive power are arranged, and an aperture is provided between the third and fourth groups to change the projection distance. In order to keep the projection image and the projected image conjugate, the first group moves in the optical axis direction, and during zooming, the first and fifth groups are fixed, and the second and third groups are fixed.
Group, and the fourth group performs a movement in the direction of the optical axis, the focal length of the first group: f 1, the focal length of the second lens group: f 2, a focal length of the third group: f 3, the fifth group The focal length is f 5 , the focal length of the entire system at the wide-angle end is fw, and the conditions are: (5) 1.10 <fw / | f 1 | <1.35 (6) 0.36 <| f 1 | / f A projection zoom lens satisfying the following conditions: 2 <0.49 (7) 0.53 <fw / f 3 <0.67 (8) 0.41 <fw / f 5 <0.49. 【請求項３】請求項１または２記載のズームレンズにお
いて、 第１群を構成するレンズ中の少なくとも１面が非球面で
あることを特徴とする投射用ズームレンズ。3. A zoom lens for projection according to claim 1, wherein at least one surface of the lenses constituting the first group is an aspherical surface. 【請求項４】請求項１または２記載の投射用ズームレン
ズにおいて、第３群が、屈折率：１．７以上の材質によ
る１枚のレンズで構成されたことを特徴とする投射用ズ
ームレンズ。4. The zoom lens for projection according to claim 1 or 2, wherein the third group is composed of one lens made of a material having a refractive index of 1.7 or more. . 【請求項５】請求項４記載の投射用ズームレンズにおい
て、 第１群を構成するレンズ中の少なくとも１面が非球面で
あることを特徴とする投射用ズームレンズ。5. The zoom lens for projection according to claim 4, wherein at least one surface of the lenses forming the first group is an aspherical surface.
JP2001401394A 2001-12-28 2001-12-28 Projection zoom lens Expired - Fee Related JP4188595B2 (en)

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JP2006084971A (en) * 2004-09-17 2006-03-30 Canon Inc Zoom lens and image projector having same
JP2007206331A (en) * 2006-02-01 2007-08-16 Canon Inc Zoom lens and image projector with the same
JP2008083229A (en) * 2006-09-26 2008-04-10 Fujinon Corp Projection zoom lens and projection display device
JP2009069539A (en) * 2007-09-13 2009-04-02 Fujinon Corp Projection type zoom lens and projection-type display device
JP2009258184A (en) * 2008-04-11 2009-11-05 Fujinon Corp Projection zoom lens and projection type display apparatus
US7710659B2 (en) 2008-04-17 2010-05-04 Fujinon Corporation Projection zoom lens system and projection type display apparatus
US7855840B2 (en) 2009-02-16 2010-12-21 Seiko Epson Corporation Projection zoom lens and projection type image display device
JP2010190939A (en) * 2009-02-16 2010-09-02 Seiko Epson Corp Projection zoom lens and projection type image display device
JP2011242520A (en) * 2010-05-17 2011-12-01 Olympus Imaging Corp Imaging optical system and imaging apparatus comprising the same
CN102455494A (en) * 2010-10-28 2012-05-16 佛山普立华科技有限公司 Zoom projection lens
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JP2013148930A (en) * 2013-05-02 2013-08-01 Seiko Epson Corp Projection zoom lens and projection type image display device

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