JPH10170824A - Projection lens - Google Patents
Projection lensInfo
- Publication number
- JPH10170824A JPH10170824A JP33584496A JP33584496A JPH10170824A JP H10170824 A JPH10170824 A JP H10170824A JP 33584496 A JP33584496 A JP 33584496A JP 33584496 A JP33584496 A JP 33584496A JP H10170824 A JPH10170824 A JP H10170824A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- condition
- back focus
- reduction side
- entire system
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は投射用レンズに関
する。この発明の投射用レンズは、３板式液晶プロジェ
クタ用の投射用レンズとして好適に利用できる。The present invention relates to a projection lens. The projection lens of the present invention can be suitably used as a projection lens for a three-panel liquid crystal projector.
【０００２】[0002]
【従来の技術】大画面表示が可能な液晶プロジェクタが
一般に知られ、カラー表示において、画素数が大きく高
画質なカラー画像を表示できる「３板式液晶プロジェク
タ」が次第に主流になりつつある。2. Description of the Related Art A liquid crystal projector capable of displaying a large screen is generally known, and in color display, a "three-panel type liquid crystal projector" capable of displaying a high-quality color image with a large number of pixels is gradually becoming mainstream.
【０００３】３板式液晶プロジェクタは、赤（Ｒ）、緑
（Ｇ）、青（Ｂ）の画像を別個の液晶パネルに表示し、
白色光源からの白色光束をＲ，Ｇ，Ｂに色分解し、色分
解された各光束で、対応する色の画像を表示した液晶パ
ネルを照射し、これら液晶パネルを透過した光束をプリ
ズム（クロスタイプやフィリップスタイプ）やミラー等
で合成して投射用レンズに入射させ、投射用レンズによ
り拡大してスクリーン上にＲ，Ｇ，Ｂの拡大画像を投影
し、これら画像の合成によりスクリーン上にカラー画像
を得るようにした液晶プロジェクタである。A three-panel liquid crystal projector displays red (R), green (G), and blue (B) images on separate liquid crystal panels,
The white light flux from the white light source is color-separated into R, G, and B, and each of the color-separated light fluxes irradiates a liquid crystal panel displaying an image of a corresponding color. Type, Philips type) or a mirror and the like, and the light is incident on the projection lens, enlarged by the projection lens to project an enlarged image of R, G, and B on the screen, and a color is synthesized on the screen by combining these images. This is a liquid crystal projector for obtaining an image.
【０００４】３板式液晶プロジェクタでは、上記の如
く、投射用レンズの物体側、即ち縮小側に、液晶パネル
やプリズムやミラー等の光束合成手段が配備されるの
で、これに用いられる投射用レンズは、液晶パネルや光
束合成手段を配備するための空間として、長いバックフ
ォーカスを必要とする。In the three-panel type liquid crystal projector, as described above, a light beam synthesizing means such as a liquid crystal panel, a prism or a mirror is provided on the object side of the projection lens, that is, on the reduction side. In addition, a long back focus is required as a space for disposing the liquid crystal panel and the light beam combining means.
【０００５】また、投射用レンズの倍率の色収差が良好
に補正されていないと、スクリーン上に表示されるカラ
ー画像に「色ずれ」が発生し、表示されたカラー画像の
像質を損なう。[0005] If the chromatic aberration of magnification of the projection lens is not properly corrected, "color misregistration" occurs in the color image displayed on the screen, and the image quality of the displayed color image is impaired.
【０００６】また、上記光束合成手段により、各色の光
束を合成する際、光束合成手段に入射する光束の角度が
画角により異なると、所謂「色シェーディング」が発生
するので、投射用レンズは、全画角で主光線の入射角が
同じになるテレセントリックな光学系であることが望ま
しい。When the light beam combining means combines light beams of the respective colors, if the angle of the light beam incident on the light beam combining means differs depending on the angle of view, so-called "color shading" occurs. It is desirable that the optical system be a telecentric optical system in which the incident angle of the principal ray is the same at all angles of view.
【０００７】[0007]
【発明が解決しようとする課題】この発明は、所望の性
能を維持しつつ、必要な長さのバックフォーカスを確保
できる投射用レンズの実現を課題とする。この発明はま
た、色ずれの発生しにくい投射用レンズの実現を課題と
する。この発明はさらにまた、テレセントリック性が高
く、色シェーディングの発生しにくい投射用レンズの実
現を課題とするSUMMARY OF THE INVENTION An object of the present invention is to provide a projection lens capable of securing a required length of back focus while maintaining desired performance. Another object of the present invention is to realize a projection lens in which color shift is less likely to occur. Still another object of the present invention is to realize a projection lens having high telecentricity and less likely to cause color shading.
【０００８】[0008]
【課題を解決するための手段】この発明の投射用レンズ
は、前群と、後群と、絞りとを有する。「前群」は、拡
大側（スクリーン側）に配備され、全体として負の屈折
力を有する。「後群」は、縮小側（光束合成手段側）に
配備され、全体として正の屈折力を有する。「絞り」
は、前群と後群との間に配備される。A projection lens according to the present invention has a front group, a rear group, and a stop. The “front group” is disposed on the magnification side (screen side), and has a negative refractive power as a whole. The “rear group” is disposed on the reduction side (light flux combining unit side) and has a positive refractive power as a whole. "Aperture"
Is arranged between the front group and the rear group.
【０００９】全系中には、２面以上の「非球面」が採用
されている。全系の焦点距離をｆ、縮小側における全系
のバックフォーカスをＢｆ、レンズ全長をＬとすると
き、これらは条件： （１） −４ ＜（２・Ｂｆ−Ｌ）／ｆ＜ １ を満足する（請求項１）。In the entire system, two or more "aspheric surfaces" are employed. When the focal length of the entire system is f, the back focus of the entire system on the reduction side is Bf, and the total length of the lens is L, these conditions satisfy the following condition: (1) −4 <(2 · Bf−L) / f <1. (Claim 1).
【００１０】後群における「最も拡大側の面から拡大側
主点位置までの距離」をＤＨＲ、後群における「最も縮
小側の面から縮小側主点位置までの距離」をＤＨ’Ｒ、
「後群の全長」をＬＲとするとき、請求項２記載の発明
の投射用レンズは、これらが条件： （２） ＤＨＲ ＞１／３・ＬＲ （３） ＤＨ’Ｒ ＞−１／３・ＬＲ を満足することを特徴とする。距離：ＤＨＲ，ＤＨ’Ｒ
における「符号」は、拡大側から縮小側へ向かう場合を
正、縮小側から拡大側へ向かう場合を負とする。In the rear group, the "distance from the most enlarged surface to the enlarged principal point position" is DHR, and in the rear group, the "distance from the most reduced surface to the reduced principal point position" is DH'R.
Assuming that “the total length of the rear group” is LR, the projection lens according to the second aspect of the present invention has the following conditions: (2) DHR> １ ／ · LR (3) DH′R> − ／ · LR is satisfied. Distance: DHR, DH'R
Is positive when going from the enlargement side to the reduction side, and negative when going from the reduction side to the enlargement side.
【００１１】上記請求項１または２記載の投射用レンズ
において、「開口絞りよりも縮小側に位置し、正の屈折
力を持つレンズ（後群に含まれる正レンズ）」のアッベ
数の平均値をνP、同じく「開口絞りよりも縮小側にあ
る負の屈折力を持つレンズ（後群に含まれる負レン
ズ）」のアッベ数の平均値をνMとするとき、請求項３
記載の発明の投射用レンズは、これらが条件： （４） νP−νM ＞ ３０ を満足することを特徴とする。In the projection lens according to claim 1 or 2, the average value of the Abbe number of the “lens having a positive refractive power (positive lens included in the rear group) located on the reduction side with respect to the aperture stop”. Where νP is the average value of Abbe numbers of the “lens having a negative refractive power (negative lens included in the rear group) closer to the reduction side than the aperture stop”.
The projection lens according to the described invention is characterized in that these satisfy the following condition: (4) νP−νM> 30.
【００１２】請求項１または２または３記載の投射用レ
ンズにおいて、開口絞りは「後群の拡大側の焦点位置近
傍」に配備することができる（請求項４）。さらに、請
求項１または２または３または４記載の投射用レンズに
おいて、前群は「負の屈折力を持つレンズを、少なくと
も３枚」含むことができる（請求項５）。In the projection lens according to the first, second, or third aspect, the aperture stop can be provided "in the vicinity of the focal position on the enlargement side of the rear group" (claim 4). Furthermore, in the projection lens according to claim 1, 2, 3 or 4, the front group can include "at least three lenses having negative refractive power" (claim 5).
【００１３】３板式液晶プロジェクタの投射用レンズ
は、焦点距離に比べて長いバックフォーカスを持つが、
レトロフォーカスタイプはその屈折力の構成上、このよ
うな条件に適したレンズタイプである。また、背面投射
型プロジェクタ用として必要とされる大きい投射画角に
対応できるという意味でもレトロフォーカスタイプは適
している。Although the projection lens of the three-panel type liquid crystal projector has a back focus longer than the focal length,
The retrofocus type is a lens type suitable for such a condition because of its refractive power configuration. The retrofocus type is also suitable in that it can cope with a large projection angle of view required for a rear projection type projector.
【００１４】このような観点から、本発明の投射レンズ
は基本構成をレトロフォーカスタイプとした。即ち、開
口絞りを挟んで、拡大側に「全体として負の屈折力を持
つ前群」を配し、縮小側に「全体として正の屈折力を持
つ後群」を配することにより、拡大側から縮小側に向か
って、負・正の屈折力配置とし、３板式液晶プロジェク
タに使用するのに十分な長いバックフォーカスを確保し
ている。From such a viewpoint, the basic configuration of the projection lens of the present invention is a retrofocus type. In other words, by sandwiching the aperture stop, the front group having a negative refractive power as a whole is disposed on the enlargement side, and the rear group having a positive refractive power as a whole is disposed on the reduction side. The negative and positive refractive powers are arranged from the lens to the reduction side, and a long back focus sufficient for use in a three-panel liquid crystal projector is secured.
【００１５】この場合、基本的な像性能を保ったままバ
ックフォーカスと焦点距離の比をより大きく確保する方
法としては「レンズ全長を比較的短くした状態で、各群
の屈折力を大きくする方法」と、これとは逆に「各群の
屈折力をあまり大きくせず、レンズ全長を比較的大きく
する方法」とがある。In this case, as a method of securing a larger ratio between the back focus and the focal length while maintaining the basic image performance, a method of increasing the refractive power of each group while keeping the overall length of the lens relatively short. Contrary to this, there is a "method of relatively increasing the overall length of the lens without increasing the refractive power of each group so much."
【００１６】しかし前者では、レンズ系は全体としてコ
ンパクトなものとなるが、収差の発生量が大きくなり、
結像性能の崩れを生じやすい。また、後者では、レンズ
は全体として大きくなるが収差の発生量が少なく良好な
画像を得易い。However, in the former case, the lens system becomes compact as a whole, but the amount of generated aberration becomes large,
The imaging performance tends to collapse. In the latter case, the lens becomes larger as a whole, but the amount of aberration is small and a good image is easily obtained.
【００１７】この発明では、これら両者をバランスさせ
ることにより、良好な性能を維持しつつ、所要のバック
フォーカスを確保し、レンズ系の大型化を可及的に少な
くしている。In the present invention, by balancing these two factors, a required back focus is secured while maintaining good performance, and the size of the lens system is reduced as much as possible.
【００１８】条件（１）は良好な画像性能を維持しつ
つ、バックフォーカスの焦点距離に対する大きな比を確
保し、且つ低コストなレンズを実現するための条件であ
る。条件（１）の下限を越えるとレンズ全長が長くな
り、従って、拡大側に位置するレンズの径が大きなもの
となり、高価なレンズとなってしまう。また、上限を越
えると、収差の補正状態を良好に維持したまま長いバッ
クフォーカスを確保することが困難となる。Condition (1) is a condition for securing a large ratio of the back focus to the focal length and realizing a low-cost lens while maintaining good image performance. When the value goes below the lower limit of the condition (1), the overall length of the lens becomes longer. Therefore, the diameter of the lens located on the enlargement side becomes large, resulting in an expensive lens. If the upper limit is exceeded, it is difficult to secure a long back focus while maintaining the aberration correction state in a good condition.
【００１９】また、２面以上の非球面を有効に使用する
ことにより、画面周辺部における歪曲収差とフレア、像
面の倒れ等の結像性能に関わる収差の良好な補正が可能
である。By effectively using two or more aspherical surfaces, it is possible to satisfactorily correct distortion and flare in the peripheral portion of the screen and aberrations related to imaging performance such as image plane tilt.
【００２０】後群の「拡大側主点位置」を前群レンズか
ら離すことで、現実のレンズ配置に比して長い光学的な
レンズ長を確保でき、性能を良好に維持できる。また、
後群の「縮小側主点位置」を拡大側主点位置から更に離
れて縮小側に設定することにより、限られたレンズ全長
の中で長いバックフォーカスと、より良好な結像性能を
確保できるようになる。By separating the "magnification-side principal point position" of the rear group from the front group lens, an optical lens length longer than the actual lens arrangement can be secured, and the performance can be maintained well. Also,
By setting the "reduction side principal point position" of the rear group further away from the enlargement side principal point position on the reduction side, it is possible to secure a long back focus and better imaging performance within the limited overall lens length. Become like
【００２１】条件（２），（３）は、このような状態を
実現するための条件であり、これら条件（２），（３）
を満足することにより、良好に像性能を維持しつつ長い
バックフォーカスを確保することが可能である。Conditions (2) and (3) are conditions for realizing such a state, and these conditions (2) and (3)
Is satisfied, it is possible to secure a long back focus while maintaining good image performance.
【００２２】条件（４）は、倍率色収差を小さく抑える
ための条件であり、下限を越えると倍率色収差が補正不
足となり、スクリーン上で青色の画像が緑色の画像より
も拡大され、赤色の画像が緑色の画像よりも縮小されて
表示されることにより、色毎の画素ずれが発生して色再
現性が悪化する。The condition (4) is a condition for keeping the chromatic aberration of magnification small. When the chromatic aberration of magnification is less than the lower limit, the chromatic aberration of magnification is insufficiently corrected, the blue image is enlarged on the screen more than the green image, and the red image is enlarged. When the image is displayed in a smaller size than the green image, a pixel shift occurs for each color, and the color reproducibility deteriorates.
【００２３】請求項４記載の発明の投射用レンズにおけ
るように、後群の拡大側焦点位置に開口絞りを配置する
と、投射用レンズ全体として「縮小側においてテレセン
トリック」となり、少なくとも主光線に関しては色シェ
ーディングが発生しないようにすることが可能となる。
また、一般に縮小側がテレセントリックな状態となって
いると、光源から入射する照明光を「損失分」少なく効
率良く利用できる。この発明の投射用レンズは、焦点距
離に比して非常に長いバックフォーカスを持っているた
め、請求項５記載の発明のように、前群の発散力を少な
くとも３枚の凹レンズに分散することにより、尚良好な
像性能が得られる。As in the projection lens according to the fourth aspect of the present invention, when the aperture stop is arranged at the focal position on the enlargement side of the rear group, the projection lens as a whole becomes "telecentric on the reduction side", and at least the principal ray is colored. Shading can be prevented from occurring.
Further, in general, when the reduction side is in a telecentric state, the illumination light incident from the light source can be used efficiently with less “loss”. Since the projection lens of the present invention has a very long back focus compared to the focal length, the diverging force of the front group is dispersed to at least three concave lenses as in the invention of claim 5. As a result, good image performance can be obtained.
【００２４】このように構成することにより、この発明
の投射用レンズは、良好な性能を維持しつつ、Ｆ／Ｎ
ｏ．：２．２程度、半画角：４３度前後という、大口径
かつ広画角なレンズを実現できる。With such a configuration, the projection lens of the present invention can maintain F / N while maintaining good performance.
o. : About 2.2, half angle of view: around 43 degrees, a lens with a large aperture and a wide angle of view can be realized.
【００２５】[0025]
【発明の実施の形態】図１に示すように、前群Ｉは拡大
側に配備され、後群ＩＩは縮小側に配備され、これら前
・後群に挾まれるように開口絞りＳが配備される。後群
ＩＩの縮小側には「光束合成手段」がバックフォーカス
内に配備される。光束合成手段としては「クロスタイプ
のプリズム」が想定されている。図１（実施例１のレン
ズ構成）に例示するように、「Ｒi」は拡大側（スクリ
ーン側）から数えて第ｉ番目の面（開口絞りの面、光束
合成手段の面を含む）の曲率半径、「Ｄi」は第ｉ番目
の面と第ｉ＋１番目の面の軸上面間隔を示し、「Ｎj」
は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」は第ｊ番目のレンズのアッベ数を示す。
また、Ｄ0（ｉ＝０）はスクリーンからレンズ第１面ま
での距離、最終のＤiは「色合成プリズムの液晶パネル
側の面から液晶パネル面までの距離」である。また、ｆ
は全系の焦点距離、Ｆ／Ｎｏ．はＦナンバを表す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a front unit I is disposed on the enlargement side, a rear unit II is disposed on the reduction side, and an aperture stop S is disposed between the front and rear units. Is done. On the reduction side of the rear group II, a "light beam combining means" is provided in the back focus. A “cross-type prism” is assumed as the light beam combining means. As exemplified in FIG. 1 (the lens configuration of the first embodiment), “R i ” is the i-th surface (including the surface of the aperture stop and the surface of the light beam combining means) counted from the enlargement side (screen side). The radius of curvature, “D i ” indicates the axial top surface distance between the i-th surface and the (i + 1) -th surface, and “N j ”
Represents the refractive index of the j-th lens with respect to the d-line counted from the magnification side, and “ν j ” represents the Abbe number of the j-th lens.
D 0 (i = 0) is the distance from the screen to the first lens surface, and the final Di is “the distance from the liquid crystal panel side surface of the color combining prism to the liquid crystal panel surface”. Also, f
Is the focal length of the entire system, F / No. Represents the F number.
【００２６】非球面は周知の如く、光軸方向にＺ軸、光
軸直交方向にＨ軸を取り、近軸曲率半径をＲ、円錐定数
をＫ、高次の非球面係数をＡ，Ｂ，Ｃ．．．とすると
き、 Ｚ＝(１/Ｒ)・Ｈ2／[１＋√（１−(Ｋ＋１)・(１/Ｒ)2
・Ｈ2）]＋Ａ・Ｈ4＋Ｂ・Ｈ6＋Ｃ・Ｈ8＋Ｄ・Ｈ10＋Ｅ
・Ｈ12＋Ｆ・Ｈ14＋．． で表される曲線を光軸（Ｚ軸）の回りに回転して得られ
る曲面であり、上記Ｒ，Ｋ，Ａ，Ｂ，Ｃ．．．を与えて
形状を特定する。As is well known, the aspheric surface takes the Z axis in the optical axis direction and the H axis in the direction orthogonal to the optical axis, the radius of paraxial curvature is R, the conic constant is K, and the higher order aspheric coefficients are A, B, and A. C. . . Z = (1 / R) · H 2 / [1 + √ (1- (K + 1) · (1 / R) 2
· H 2 )] + A · H 4 + B · H 6 + C · H 8 + D · H 10 + E
・ H 12 + F ・ H 14 +. . Is a curved surface obtained by rotating the curve represented by R around the optical axis (Z-axis), and the above-mentioned R, K, A, B, C. . . To specify the shape.
【００２７】各実施例における、焦点距離：ｆ、バック
フォーカス、及びＦ/Ｎｏ．の算出基準波長は５３５ｎ
ｍである。In each embodiment, the focal length: f, back focus, and F / No. Is 535n.
m.
【００２８】以下、具体的な実施例を５例挙げる。Hereinafter, five specific examples will be described.
【００２９】[0029]
実施例１ ｉ Ｒi Ｄi Ｊ Ｎj νj ０ 560.0 １ 69.639 3.0 1 1.49194 57.2 ２ 36.131 13.868 ３ 36.667 2.0 2 1.69680 55.5 ４ 15.112 12.41 ５ -28.242 2.0 3 1.69680 55.5 ６ -60.908 11.985 ７ 52.369 2.0 4 1.69680 55.5 ８ 14.813 0.1 ９ 14.919 6.5 5 1.61650 31.0 10 -332.572 4.21 11 ∞（開口絞り面） 15.287 12 -1048.771 11.735 6 1.51680 64.2 13 -18.231 2.0 7 1.92286 20.9 14 -37.767 0.2 15 -233.656 7.17 8 1.49194 57.2 16 -34.130 0.2 17 -148.183 10.327 9 1.69680 55.5 18 -34.619 5.0 19 ∞ 40.0 10 1.51680 64.2 20 ∞ 16.08 １９、２０面は光束合成手段の面である。 Example 1 i Ri Di J Nj vj 0 560.0 1 69.639 3.0 1 1.49194 57.2 2 36.131 13.868 3 36.667 2.0 2 1.69680 55.5 4 15.112 12.41 5 -28.242 2.0 3 1.69680 55.5 6 -60.908 11.985 7 52.369 2.0 4 1.69680 55.58 14.8 14.919 6.5 5 1.61650 31.0 10 -332.572 4.21 11 ∞ (aperture stop surface) 15.287 12 -1048.771 11.735 6 1.51680 64.2 13 -18.231 2.0 7 1.92286 20.9 14 -37.767 0.2 15 -233.656 7.17 8 1.49194 57.2 16 -34.130 0.2 17 -148.183 10.327 9 1.69680 55.5 18 -34.619 5.0 19 ∞ 40.0 10 1.51680 64.2 20 ∞ 16.08 19 and 20 are the surfaces of the light beam combining means.
【００３０】非球面： 第２面 K=-0.935235,A=-0.749945×10~5,B=-0.480162×10~10,C
=0.260303×10~11,D=-0.106583×10~14,E=0.0,F=0.0 第１６面 K=0.470033,A=0.108889×10~4,B=0.513728×10~8,C=0.6
58053×10~11,D=0.0,E=0.0,F=0.0
。The aspheric: the second surface K = -0.935235, A = -0.749945 × 10 ~ 5, B = -0.480162 × 10 ~ 10, C
= 0.260303 × 10 ~ 11 , D = -0.106583 × 10 ~ 14 , E = 0.0, F = 0.0 16th page K = 0.470033, A = 0.108889 × 10 ~ 4 , B = 0.513728 × 10 ~ 8 , C = 0.6
58053 × 10 ~ 11 , D = 0.0, E = 0.0, F = 0.0
.
【００３１】ｆ＝13.4，バックフォーカス＝47.11，Ｆ
／Ｎｏ．＝2.2 射出瞳位置：-7744（第１８面から） 条件の値： 条件（１）の値：−０．８０ 条件（２）の値：ＤＨＲ＝０．５９・ＬＲ 条件（３）の値：ＤＨ'Ｒ＝−０．０４・ＬＲ 条件（４）の値：３８．１
。F = 13.4, back focus = 47.11, F
/ No. = 2.2 Exit pupil position: -7744 (from the 18th plane) Condition value: Condition (1) value: -0.80 Condition (2) value: DHR = 0.59 · LR Condition (3) value: DH′R = −0.04 · LR The value of the condition (4): 38.1
.
【００３２】実施例２ ｉ Ｒi Ｄi ｊ Ｎj νj ０ 560.0 １ 65.505 3.0 1 1.49194 57.2 ２ 35.712 13.397 ３ 38.469 2.0 2 1.69680 55.5 ４ 15.780 11.815 ５ -33.979 2.0 3 1.69680 55.5 ６ -52.863 11.111 ７ -28.105 2.0 4 1.69680 55.5 ８ -58.096 0.2 ９ 54.288 2.0 5 1.69680 55.5 10 14.957 0.1 11 15.135 8.0 6 1.61650 31.0 12 -84.134 2.60 13 ∞（開口絞り面） 15.078 14 981.462 11.984 7 1.51680 64.2 15 -18.231 2.0 8 1.92286 20.9 16 -37.952 0.2 17 -162.593 6.64 9 1.49194 57.2 18 -35.011 0.2 19 -209.768 10.679 10 1.69680 55.5 20 -35.147 5.0 21 ∞ 40.0 11 1.51680 64.2 22 ∞ 16.12 第２１、２２面は光束合成手段の面である。Example 2 i RiDi Nj νj 0 560.0 1 65.505 3.0 1 1.49194 57.2 2 35.712 13.397 3 38.469 2.0 2 1.69680 55.5 4 15.780 11.815 5 -33.979 2.0 3 1.69680 55.5 6 -52.863 11.111 7 -28.105 2.0 4 1.69680 55.5 8 -58.096 0.2 9 54.288 2.0 5 1.69680 55.5 10 14.957 0.1 11 15.135 8.0 6 1.61650 31.0 12 -84.134 2.60 13 ∞ (aperture stop) 15.078 14 981.462 11.984 7 1.51680 64.2 15 -18.231 2.0 8 1.92286 20.9 16 -37.952 0.2 17- 162.593 6.64 9 1.49194 57.2 18 -35.011 0.2 19 -209.768 10.679 10 1.69680 55.5 20 -35.147 5.0 21 ∞ 40.0 11 1.51680 64.2 22 ∞ 16.12 Surfaces 21 and 22 are the surfaces of the light beam combining means.
【００３３】非球面： 第２面 K=-0.917837,A=-0.742741×10~5,B=-0.150552×10~9,C=
0.251827×10~11,D=-0.100073×10~14,E=0.0,F=0.0 第１６面 K=0.585242,A=0.105828×10~4,B=0.523258×10~8,C=0.7
27856×10~11,D=0.0,E=0.0,F=0.0
。The aspheric: the second surface K = -0.917837, A = -0.742741 × 10 ~ 5, B = -0.150552 × 10 ~ 9, C =
0.251827 × 10 ~ 11 , D = -0.100073 × 10 ~ 14 , E = 0.0, F = 0.0 16th page K = 0.585242, A = 0.105828 × 10 ~ 4 , B = 0.523258 × 10 ~ 8 , C = 0.7
27856 × 10 ~ 11 , D = 0.0, E = 0.0, F = 0.0
.
【００３４】ｆ＝13.4，バックフォーカス＝47.14，Ｆ
／Ｎｏ．＝2.2 射出瞳位置：-3733（第２０面から） 条件の値： 条件（１）の値：−０．８ 条件（２）の値：ＤＨＲ＝０．５８・ＬＲ 条件（３）の値：ＤＨ'Ｒ＝−０．０５・ＬＲ 条件（４）の値：３８．１
。F = 13.4, back focus = 47.14, F
/ No. = 2.2 Exit pupil position: -3733 (from the 20th surface) Condition value: Condition (1) value: -0.8 Condition (2) value: DHR = 0.58 · LR Condition (3) value: DH'R = -0.05.LR Value of condition (4): 38.1
.
【００３５】実施例３ ｉ Ｒi Ｄi ｊ Ｎj νj ０ 560.0 １ 69.236 3.0 1 1.49194 57.2 ２ 40.062 12.602 ３ 45.731 2.0 2 1.69680 55.5 ４ 14.571 11.052 ５ -25.629 2.0 3 1.69680 55.5 ６ -69.471 9.181 ７ 43.435 2.0 4 1.69680 55.5 ８ 14.643 0.1 ９ 14.750 6.5 5 1.61650 31.0 10 -325.592 6.07 11 ∞（開口絞り面） 13.203 12 201.552 11.308 6 1.51680 64.2 13 -18.420 2.0 7 1.80518 25.5 14 -106.357 0.2 15 187.751 9.609 8 1.49194 57.2 16 -30.873 0.2 17 -1615.032 13.974 9 1.49194 57.2 18 -27.509 5.0 19 ∞ 40.0 10 1.51680 64.2 20 ∞ 16.08 第１９、２０面は光束合成手段の面である。Example 3 i Ri Di Nj νj 0 560.0 1 69.236 3.0 1 1.49194 57.2 2 40.062 12.602 3 45.731 2.0 2 1.69680 55.5 4 14.571 11.052 5 -25.629 2.0 3 1.69680 55.5 6 -69.471 9.181 7 43.435 2.0 4 1.69680 55.58 14.643 0.1 9 14.750 6.5 5 1.61650 31.0 10 -325.592 6.07 11 ∞ (Aperture stop surface) 13.203 12 201.552 11.308 6 1.51680 64.2 13 -18.420 2.0 7 1.80518 25.5 14 -106.357 0.2 15 187.751 9.609 8 1.49194 57.2 16 -30.873 0.2 17 -1615.032 13.974 9 1.49194 57.2 18 -27.509 5.0 19 ∞ 40.0 10 1.51680 64.2 20 ∞ 16.08 The 19th and 20th surfaces are the surfaces of the light beam combining means.
【００３６】非球面： 第２面 K=-2.318827,A=-0.777660×10~5,B=0.247709×10~8,C=
0.284989×10~11,D=-0.291969×10~14,E=0.785770×10~
18,F=0.0 第１６面 K=0.230019,A=0.123542×10~4,B=0.670675×10~8,C=0.4
65020×10~11,D=0.0,E=0.0,F=0.0 第１８面 K=-0.550795,A=0.481557×10~8,B=0.0,C=0.0,D=0.0,E=
0.0,F=0.0 。The aspheric: the second surface K = -2.318827, A = -0.777660 × 10 ~ 5, B = 0.247709 × 10 ~ 8, C =
0.284989 × 10 ~ 11 , D = -0.291969 × 10 ~ 14 , E = 0.785770 × 10 ~
18 , F = 0.0 16th page K = 0.230019, A = 0.123542 × 10 ~ 4 , B = 0.670675 × 10 ~ 8 , C = 0.4
65020 × 10 ~ 11 , D = 0.0, E = 0.0, F = 0.0 18th page K = -0.550795, A = 0.481557 × 10 ~ 8 , B = 0.0, C = 0.0, D = 0.0, E =
0.0, F = 0.0.
【００３７】ｆ＝13.36，バックフォーカス＝47.1，Ｆ
／Ｎｏ．＝2.19 射出瞳位置：3051（第１８面から） 条件の値： 条件（１）の値：−０．８１ 条件（２）の値：ＤＨＲ＝０．５８・ＬＲ 条件（３）の値：ＤＨ'Ｒ＝−０．１０・ＬＲ 条件（４）の値：３４．０
。F = 13.36, back focus = 47.1, F
/ No. = 2.19 Exit pupil position: 3051 (from the 18th surface) Condition value: Condition (1) value: -0.81 Condition (2) value: DHR = 0.58 · LR Condition (3) value: DH 'R = −0.10 · LR The value of the condition (4): 34.0
.
【００３８】実施例４ ｉ Ｒi Ｄi ｊ Ｎj νj ０ 560.0 １ 66.705 2.0 1 1.49194 57.2 ２ 30.698 8.064 ３ 31.669 2.0 2 1.74330 49.2 ４ 16.477 21.744 ５ -25.134 6.282 3 1.77250 49.6 ６ 23.870 0.62 ７ 27.515 5.675 4 1.78472 25.7 ８ -40.331 3.614 ９ ∞（開口絞り面） 12.027 10 52.648 12.587 5 1.58913 61.3 11 -59.228 1.118 12 -45.330 2.232 6 1.92286 20.9 13 74.935 0.539 14 83.704 8.272 7 1.49194 57.2 15 -33.607 0.2 16 260.291 13.025 8 1.69680 55.5 17 -32.602 5.0 18 ∞ 40.0 9 1.51680 64.2 19 ∞ 15.19 第１８、１９面は光束合成手段の面である。Example 4 i RiDi Nj νj 0 560.0 1 66.705 2.0 1 1.49194 57.2 2 30.698 8.064 3 31.669 2.0 2 1.74330 49.2 4 16.477 21.744 5 -25.134 6.282 3 1.77250 49.6 6 23.870 0.62 7 27.515 5.675 4 1.784725.7 40.331 3.614 9 ∞ (aperture stop surface) 12.027 10 52.648 12.587 5 1.58913 61.3 11 -59.228 1.118 12 -45.330 2.232 6 1.92286 20.9 13 74.935 0.539 14 83.704 8.272 7 1.49194 57.2 15 -33.607 0.2 16 260.291 13.025 8 1.69680 55.5 17 -32.602 5.0 18 ∞ 40.0 9 1.51680 64.2 19 ∞ 15.19 The 18th and 19th surfaces are the surfaces of the light beam combining means.
【００３９】非球面： 第２面 K=-2.059832,A=-0.670443×10~5,B=0.214120×10~8,C=
0.0,D=0.0,E=0.0,F=0.0 第１５面 K=0.624213,A=0.138632×10~4,B=0.254918×10~7,C=0.
0,=0.0,E=0.0,F=0.0
。The aspheric: the second surface K = -2.059832, A = -0.670443 × 10 ~ 5, B = 0.214120 × 10 ~ 8, C =
0.0, D = 0.0, E = 0.0, F = 0.0 15th page K = 0.624213, A = 0.138632 × 10 ~ 4 , B = 0.254918 × 10 ~ 7 , C = 0.
0, = 0.0, E = 0.0, F = 0.0
.
【００４０】ｆ＝13.29，バックフォーカス＝46.22，Ｆ
／Ｎｏ．＝2.18 射出瞳位置：3651（第１７面から） 条件の値： 条件（１）の値：−０．５７ 条件（２）の値：ＤＨＲ＝０．５８・ＬＲ 条件（３）の値：ＤＨ'Ｒ＝−０．１６・ＬＲ 条件（４）の値：３７．１
。F = 13.29, back focus = 46.22, F
/ No. = 2.18 Exit pupil position: 3651 (from the 17th surface) Condition value: Condition (1) value: -0.57 Condition (2) value: DHR = 0.58 · LR Condition (3) value: DH 'R = −0.16 · LR The value of the condition (4): 37.1
.
【００４１】実施例５ ｉ Ｒi Ｄi ｊ Ｎj νj 0 560.0 １ 79.095 3.0 1 1.49194 57.2 ２ 41.742 19.670 ３ 38.279 2.0 2 1.69680 55.5 ４ 13.431 10.582 ５ -26.056 10.742 3 1.69680 55.5 ６ -59.880 0.2 ７ 48.787 14.480 4 1.71300 53.9 ８ 18.972 0.1 ９ 18.787 6.5 5 1.61650 31.0 10 -118.996 0.2 11 ∞（開口絞り面） 13.690 12 387.953 15.0 6 1.51680 64.2 13 -18.231 2.0 7 1.92286 20.9 14 -35.518 0.2 15 -287.144 6.653 8 1.49194 57.2 16 -38.552 0.2 17 -562.279 9.782 9 1.62041 60.3 18 -37.101 5.0 19 ∞ 40.0 10 1.51680 64.2 20 ∞ 10.0 第１９、２０面は光束合成手段の面である。Example 5 i RiDi Nj νj 0 560.0 1 79.095 3.0 1 1.49194 57.2 2 41.742 19.670 3 38.279 2.0 2 1.69680 55.5 4 13.431 10.582 5 -26.056 10.742 3 1.69680 55.5 6 -59.880 0.27 48.787 14.480 4 1.71300 53.98 18.972 0.19 18.787 6.5 5 1.61650 31.0 10 -118.996 0.211 ∞ (aperture stop) 13.690 12 387.953 15.0 6 1.51680 64.2 13 -18.231 2.0 7 1.92286 20.9 14 -35.518 0.2 15 -287.144 6.653 8 1.49194 57.2 16 -38.552 0.2 17- 562.279 9.782 9 1.62041 60.3 18 -37.101 5.0 19 ∞ 40.0 10 1.51680 64.2 20 ∞ 10.0 The 19th and 20th surfaces are the surfaces of the light beam combining means.
【００４２】非球面： 第２面 K=-0.635205,A=-0.620669×10~5,B=-0.346989×10~9,C=
0.271430×10~11,D=-0.183482×10~14,E=0.492646×10~
18,F=-0.369779×10~22 第１６面 K=0.60369,A=0.910429×10~5,B=0.227425×10~8,C=0.46
7273×10~11,D=0.0,E=0.0,F=0.0
。The aspheric: the second surface K = -0.635205, A = -0.620669 × 10 ~ 5, B = -0.346989 × 10 ~ 9, C =
0.271430 × 10 ~ 11 , D = -0.183482 × 10 ~ 14 , E = 0.492646 × 10 ~
18 , F = -0.369779 × 10 ~ 22 16th surface K = 0.60369, A = 0.910429 × 10 ~ 5 , B = 0.227425 × 10 ~ 8 , C = 0.46
7273 × 10 ~ 11 , D = 0.0, E = 0.0, F = 0.0
.
【００４３】ｆ＝13.46，バックフォーカス＝41.03，Ｆ
／Ｎｏ．＝2.21 射出瞳位置：-2604（第１８面から） 条件の値： 条件（１）の値：−２．４５ 条件（２）の値：ＤＨＲ＝０．５６・ＬＲ 条件（３）の値：ＤＨ'Ｒ＝−０．１０・ＬＲ 条件（４）の値：３９．７
。F = 13.46, back focus = 41.03, F
/ No. = 2.21 Exit pupil position: -2604 (from the 18th plane) Condition value: Condition (1) value: -2.45 Condition (2) value: DHR = 0.56 · LR Condition (3) value: DH′R = −0.10 · LR The value of the condition (4): 39.7
.
【００４４】図１〜図５は、上記実施例１〜５のレンズ
構成を示している。図６〜図１０に、上記実施例１〜５
に関する収差図を順次示す。FIGS. 1 to 5 show the lens arrangements of the first to fifth embodiments. FIGS. 6 to 10 show the first to fifth embodiments.
FIG.
【００４５】各収差図において、「Ｇ」は波長５３５ｎ
ｍの収差、「Ｂ」は波長４５０ｎｍの収差、「Ｒ」は波
長６２０ｎｍの収差を示す。「Ｍ」は波長５３５ｎｍの
メリディオナル像面、Ｓは同サジタル像面を示す。
「ω」は半画角を示す。In each aberration diagram, “G” indicates a wavelength of 535 n.
m, “B” indicates 450 nm wavelength aberration, and “R” indicates 620 nm wavelength aberration. "M" indicates a meridional image plane having a wavelength of 535 nm, and S indicates a sagittal image plane.
“Ω” indicates a half angle of view.
【００４６】[0046]
【発明の効果】以上に説明したように、この発明によれ
ば３板式液晶プロジェクタに適した投射用レンズを実現
できる。請求項１記載の発明の投射用レンズは良好な性
能を維持しつつ、十分に長いバックフォーカスを有し、
低コストで実現できる。請求項２記載の発明の投射用レ
ンズは、性能をより高めることができる。請求項３記載
の発明の投射用レンズは、表示カラー画像における色ず
れを有効に軽減でき、請求項４記載の発明の投射用レン
ズは、色シェーディングを有効に軽減でき、請求項５記
載の発明の投射用レンズは、より良好な像性能を実現で
きる。As described above, according to the present invention, a projection lens suitable for a three-panel liquid crystal projector can be realized. The projection lens according to the first aspect of the invention has a sufficiently long back focus while maintaining good performance,
It can be realized at low cost. The projection lens according to the second aspect of the invention can further improve the performance. The projection lens according to the third aspect of the invention can effectively reduce color misregistration in a display color image, and the projection lens according to the fourth aspect of the invention can effectively reduce color shading. Can achieve better image performance.
【図１】実施例１のレンズ構成を示す図である。FIG. 1 is a diagram illustrating a lens configuration according to a first embodiment.
【図２】実施例２のレンズ構成を示す図である。FIG. 2 is a diagram illustrating a lens configuration according to a second embodiment.
【図３】実施例３のレンズ構成を示す図である。FIG. 3 is a diagram illustrating a lens configuration according to a third embodiment.
【図４】実施例４のレンズ構成を示す図である。FIG. 4 is a diagram illustrating a lens configuration according to a fourth embodiment.
【図５】実施例５のレンズ構成を示す図である。FIG. 5 is a diagram showing a lens configuration of a fifth embodiment.
【図６】実施例１に関する収差図である。FIG. 6 is an aberration diagram relating to Example 1.
【図７】実施例２に関する収差図である。FIG. 7 is an aberration diagram relating to Example 2.
【図８】実施例３に関する収差図である。FIG. 8 is an aberration diagram relating to Example 3.
【図９】実施例４に関する収差図である。FIG. 9 is an aberration diagram relating to Example 4.
【図１０】実施例５に関する収差図である。FIG. 10 is an aberration diagram relating to Example 5.
Ｉ 前群 ＩＩ 後群 Ｓ 開口絞り I Front group II Rear group S Aperture stop
Claims (5)
つ前群と、縮小側に位置し全体として正の屈折力を持つ
後群とを、開口絞りを挾むように配備してなり、 非球面を２面以上有し、 全系の焦点距離をｆ、縮小側における全系のバックフォ
ーカスをＢｆ、レンズ全長をＬとするとき、これらが条
件： （１） −４ ＜（２・Ｂｆ−Ｌ）／ｆ＜ １ を満足することを特徴とする投射用レンズ。1. A front group located on the enlargement side and having a negative refractive power as a whole and a rear group located on a reduction side and having a positive refractive power as a whole are arranged so as to sandwich an aperture stop. Assuming that there are two or more aspherical surfaces, the focal length of the entire system is f, the back focus of the entire system on the reduction side is Bf, and the overall length of the lens is L, these conditions are: (1) −4 <(2 · Bf) -L) / f <1.
距離をＤＨＲ、後群における最も縮小側の面から縮小側
主点位置までの距離をＤＨ’Ｒ、後群の全長をＬＲとす
るとき、これらが条件： （２） ＤＨＲ ＞１／３・ＬＲ （３） ＤＨ’Ｒ ＞−１／３・ＬＲ （符号は拡大側から縮小側へ向かう場合を正、縮小側か
ら拡大側へ向かう場合を負とする）を満足することを特
徴とする投射用レンズ。2. The projection lens according to claim 1, wherein a distance from the most enlarged surface to the enlarged principal point position in the rear group is DHR, and a distance from the most reduced surface to the reduced principal point position in the rear group. Where DH′R is the distance of the rear group and LR is the total length of the rear group, these conditions are: (2) DHR> １ ／ · LR (3) DH′R> − ／ · LR A positive direction when going to the reduction side, and a negative case when going from the reduction side to the enlargement side).
いて、 開口絞りよりも縮小側に位置し、正の屈折力を持つレン
ズのアッベ数の平均値をνP、負の屈折力を持つレンズ
のアッベ数の平均値をνMとするとき、これらが条件： （４） νP−νM ＞ ３０ を満足することを特徴とする投射用レンズ。3. A lens according to claim 1, wherein the average value of Abbe numbers of lenses having a positive refractive power is νP, and the lens having a negative refractive power is located on a reduction side of the aperture stop. Where νM is the average value of Abbe numbers of the projection lenses, wherein: (4) νP−νM> 30.
ンズにおいて、 開口絞りが、後群の拡大側の焦点位置近傍に配備された
ことを特徴する投射用レンズ。4. The projection lens according to claim 1, wherein the aperture stop is provided near a focal position on the enlargement side of the rear group.
投射用レンズにおいて、 前群に負の屈折力を持つレンズを、少なくとも３枚含む
ことを特徴とする投射用レンズ。5. The projection lens according to claim 1, wherein at least three lenses having a negative refractive power are included in the front group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33584496A JPH10170824A (en) | 1996-12-16 | 1996-12-16 | Projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33584496A JPH10170824A (en) | 1996-12-16 | 1996-12-16 | Projection lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10170824A true JPH10170824A (en) | 1998-06-26 |
Family
ID=18293033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33584496A Pending JPH10170824A (en) | 1996-12-16 | 1996-12-16 | Projection lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10170824A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001159732A (en) * | 1999-12-02 | 2001-06-12 | Nikon Corp | Super wide angle lens and photographic device having the lens |
| US6275343B1 (en) | 1999-04-20 | 2001-08-14 | Minolta Co., Ltd. | Projection optical system |
| WO2001086340A1 (en) * | 2000-05-10 | 2001-11-15 | Mitsubishi Denki Kabushiki Kaisha | Image display and alignment adjusting method |
| JP2004177688A (en) * | 2002-11-27 | 2004-06-24 | Tamron Co Ltd | Projection lens and liquid crystal projector |
| JP2005316398A (en) * | 2004-03-31 | 2005-11-10 | Nikon Corp | Super wide-angle lens and photographing apparatus equipped with same |
| JP2015111192A (en) * | 2013-12-06 | 2015-06-18 | キヤノン株式会社 | Optical system and imaging device having the same |
| CN106443971A (en) * | 2016-10-13 | 2017-02-22 | 广东弘景光电科技股份有限公司 | Optical system applied to panoramic double-photographing module and camera lens used for optical system |
| CN109270669A (en) * | 2017-07-17 | 2019-01-25 | 上旸光学股份有限公司 | Telecentric lens systems |
-
1996
- 1996-12-16 JP JP33584496A patent/JPH10170824A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6275343B1 (en) | 1999-04-20 | 2001-08-14 | Minolta Co., Ltd. | Projection optical system |
| JP2001159732A (en) * | 1999-12-02 | 2001-06-12 | Nikon Corp | Super wide angle lens and photographic device having the lens |
| US7572014B2 (en) | 2000-05-10 | 2009-08-11 | Mitsubishi Denki Kabushiki Kaisha | Image display device and adjustment for alignment |
| US6631994B2 (en) | 2000-05-10 | 2003-10-14 | Mitsubishi Denki Kabushiki Kaisha | Image display device and adjustment for alignment |
| US6824274B2 (en) | 2000-05-10 | 2004-11-30 | Mitsubishi Denki Kabushiki Kaisha | Image display device and adjustment for alignment |
| US6994437B2 (en) | 2000-05-10 | 2006-02-07 | Mitsubishi Denki Kabushiki Kaisha | Image display device and adjustment for alignment |
| US7230774B2 (en) | 2000-05-10 | 2007-06-12 | Mitsubishi Denki Kabushiki Kaisha | Image display device and adjustment for alignment |
| WO2001086340A1 (en) * | 2000-05-10 | 2001-11-15 | Mitsubishi Denki Kabushiki Kaisha | Image display and alignment adjusting method |
| JP2004177688A (en) * | 2002-11-27 | 2004-06-24 | Tamron Co Ltd | Projection lens and liquid crystal projector |
| JP2005316398A (en) * | 2004-03-31 | 2005-11-10 | Nikon Corp | Super wide-angle lens and photographing apparatus equipped with same |
| JP2015111192A (en) * | 2013-12-06 | 2015-06-18 | キヤノン株式会社 | Optical system and imaging device having the same |
| CN106443971A (en) * | 2016-10-13 | 2017-02-22 | 广东弘景光电科技股份有限公司 | Optical system applied to panoramic double-photographing module and camera lens used for optical system |
| CN106443971B (en) * | 2016-10-13 | 2019-01-08 | 广东弘景光电科技股份有限公司 | The optical system in mould group and its camera lens of application are taken the photograph applied to panorama pair |
| CN109270669A (en) * | 2017-07-17 | 2019-01-25 | 上旸光学股份有限公司 | Telecentric lens systems |
| CN109270669B (en) * | 2017-07-17 | 2021-02-26 | 上旸光学股份有限公司 | Telecentric lens system |
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