JP3382696B2 - Telecentric zoom lens and projection display device - Google Patents
Telecentric zoom lens and projection display deviceInfo
- Publication number
- JP3382696B2 JP3382696B2 JP00884694A JP884694A JP3382696B2 JP 3382696 B2 JP3382696 B2 JP 3382696B2 JP 00884694 A JP00884694 A JP 00884694A JP 884694 A JP884694 A JP 884694A JP 3382696 B2 JP3382696 B2 JP 3382696B2
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- lens
- lens group
- group
- conjugate side
- cemented
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Description
【０００１】[0001]
【産業上の利用分野】本発明はテレセントリックズーム
レンズに関し、例えば液晶パネルに表示された像をスク
リーン面上に拡大投写する液晶プロジェクタ用の投写レ
ンズとして好適なテレセントリックズームレンズ、及び
このレンズを搭載した液晶投写型表示装置に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telecentric zoom lens, for example, a telecentric zoom lens suitable as a projection lens for a liquid crystal projector for enlarging and projecting an image displayed on a liquid crystal panel on a screen surface, and the lens. The present invention relates to a liquid crystal projection display device.
【０００２】[0002]
【従来の技術】図１６は例えば特開平１ー１５７６８８
号公報に示された従来の液晶プロジェクタを示す構成図
である。図において、１は光源、２Ｒ，２Ｇはダイクロ
イックミラー、３，４，５はミラー、６Ｒ，６Ｇ，６Ｂ
は液晶パネル、７はダイクロイックプリズム、８は投写
レンズである。2. Description of the Related Art FIG. 16 shows, for example, Japanese Patent Laid-Open No. 1-157688.
FIG. 6 is a configuration diagram showing a conventional liquid crystal projector disclosed in Japanese Patent Publication No. In the figure, 1 is a light source, 2R, 2G are dichroic mirrors, 3, 4, 5 are mirrors, 6R, 6G, 6B.
Is a liquid crystal panel, 7 is a dichroic prism, and 8 is a projection lens.
【０００３】次に動作について説明する。光源１から出
射する白色の光束を赤反射のダイクロイックミラー２
Ｒ，緑反射のダイクロイックミラー２Ｇにより赤，緑，
青の３原色光に分離し、ミラー３，４，５で折り曲げて
モノクロ液晶パネル６Ｒ，６Ｇ，６Ｂに照射する。液晶
パネルに表示された画像で変調された光束は赤反射，青
反射の面で構成された４分割ダイクロイックプリズム７
で合成され、投写レンズ８により投写光９として特に図
示しないスクリーン上に拡大投写され鑑賞に供される。Next, the operation will be described. Dichroic mirror 2 that reflects the white light emitted from light source 1 into red
R, green, red, green, dichroic mirror 2G
The light is separated into three primary colors of blue, bent by mirrors 3, 4, and 5 and irradiated on the monochrome liquid crystal panels 6R, 6G, 6B. The light flux modulated by the image displayed on the liquid crystal panel is a 4-division dichroic prism 7 composed of red and blue reflective surfaces.
Are combined with each other and enlarged and projected as projection light 9 by a projection lens 8 onto a screen (not shown) for viewing.
【０００４】以上のような液晶プロジェクタで用いられ
る投写レンズは以下の要求を満たす必要がある。
（ａ）ダイクロイックプリズム７を挿入するために長い
バックフォーカル長が確保できること。
（ｂ）公知のようにダイクロイックプリズムは分光特性
の入射角依存製が大きいので、液晶パネル側をテレセン
トリックとして主光線を液晶パネルに垂直にすること。
（ｃ）短投写距離にて大画面を得る為に焦点距離が短か
いこと。また投写倍率を容易に変化できるようズームが
可能であること。
（ｄ）画素密度の高い液晶パネルを投写するために解像
力が高く、かつ歪曲収差，倍率色収差が良く制御されて
いること。The projection lens used in the liquid crystal projector as described above must meet the following requirements. (A) A long back focal length can be secured because the dichroic prism 7 is inserted. (B) As is well known, since the dichroic prism is largely dependent on the incident angle of the spectral characteristics, the liquid crystal panel side should be telecentric so that the principal ray is perpendicular to the liquid crystal panel. (C) The focal length is short in order to obtain a large screen with a short projection distance. In addition, it should be possible to zoom so that the projection magnification can be changed easily. (D) High resolution for projecting a liquid crystal panel with high pixel density, and well controlled distortion and lateral chromatic aberration.
【０００５】[0005]
【発明が解決しようとする課題】このときのズームレン
ズとしては、例えば全系が４群〜５群のレンズ群より成
るズームレンズでは比較的広画角で比較的長いバックフ
ォーカル長を維持しながら良好な光学性能を得ることが
できるが、液晶パネル側がテレセントリックな構成のも
のは殆ど知られていなかった。しかも４〜５群構成のズ
ームレンズは鏡筒構造が複雑になるという問題がある。As the zoom lens at this time, for example, in a zoom lens whose entire system is composed of 4 to 5 lens groups, a relatively wide angle of view and a relatively long back focal length are maintained. Although good optical performance can be obtained, almost no liquid crystal panel having a telecentric configuration has been known. Moreover, there is a problem that the lens barrel structure becomes complicated in the zoom lens having the 4 to 5 group structure.
【０００６】本発明は全体として３つのレンズ群より成
り、各レンズ群のレンズ構成を適切に設定することによ
り上記（ａ）〜（ｄ）の要求をよく満足し、なおかつ鏡
筒構造の簡単な液晶プロジェクタ用のテレセントリック
ズームレンズを実現することを目的とする。またこのズ
ームレンズを投写レンズとして用いた液晶投写型表示装
置の提供を目的とする。The present invention comprises three lens groups as a whole, and by appropriately setting the lens configuration of each lens group, the above requirements (a) to (d) are well satisfied, and the lens barrel structure is simple. An object is to realize a telecentric zoom lens for a liquid crystal projector. Another object of the present invention is to provide a liquid crystal projection display device using this zoom lens as a projection lens.
【０００７】[0007]
【課題を解決するための手段】本発明のテレセントリッ
クズームレンズは、請求項１では、大きな共役側から順
に、正の屈折力の第１レンズ群Ｇ1 、負の屈折力の第２
レンズ群Ｇ2 、正の屈折力の第３レンズ群Ｇ3 の３群か
ら構成され、第１レンズ群と第３レンズ群との距離を一
定に保ったまま第２レンズ群が第１レンズ群から第３レ
ンズ群の方へ光軸上を移動することによって焦点距離が
短焦点から長焦点へと変化し、第３レンズ群の大きな共
役側の焦点近傍に絞り手段を配置し、全系の移動によっ
て合焦するレンズであって、
１．６＜ｆ1／ｆｗ＜２．８
−１．４＜ｆ2／ｆｗ＜−０．６
０．９＜ｆ3／ｆｗ＜１．５
０．４＜Ｌ23ｗ／ｆｗ＜０．８
を満足するものである。
但し、 ｆ1 ：第１レンズ群の焦点距離
ｆ2 ：第２レンズ群の焦点距離
ｆ3 ：第３レンズ群の焦点距離
ｆｗ ：短焦点端での全系の焦点距離
Ｌ23ｗ：短焦点端での第２レンズ群と第３レンズ群との
間隔According to a first aspect of the present invention, in the telecentric zoom lens of the present invention, the first lens group G1 having a positive refractive power and the second lens group having a negative refractive power are arranged in order from the large conjugate side.
The third lens group G3 has a positive refractive power and the third lens group G3 has a positive refractive power. The second lens group is divided into the first lens group from the first lens group while keeping the distance between the first lens group and the third lens group constant. By moving on the optical axis toward the third lens group, the focal length changes from the short focus to the long focus, and the diaphragm means is arranged in the vicinity of the large conjugate side focus of the third lens group to move the entire system. A focusing lens, which is 1.6 <f1 / fw <2.8 -1.4 <f2 / fw <-0.6 0.9 <f3 / fw <1.5 0.4 <L23w / fw It satisfies <0.8. However, f1: focal length of the first lens group f2: focal length of the second lens group f3: focal length of the third lens group fw: focal length of the entire system at the short focal end L23w: second at the short focal end Distance between lens group and third lens group
【０００８】請求項２では、前記第３レンズ群の前記大
きな共役側の近軸焦点位置から前記絞り手段に至る距離
を△とするとき、
｜△／ｆ3｜＜０．１５
を満足するものである。In the second aspect, when the distance from the paraxial focal position on the large conjugate side of the third lens group to the diaphragm means is Δ, | Δ / f3 | <0.15 is satisfied. is there.
【０００９】請求項３では、前記第３レンズ群は１個の
接合レンズを含み、前記大きな共役側から順にＧ31，Ｇ
32の２群より構成され、レンズ群Ｇ31は前記小さな共役
側の端に接合レンズの接合面を含み、
−３０＜ｆ31／ｆ32＜−４
を満足するものである。
但し、 ｆ31：レンズ群Ｇ31の空気換算焦点距離
ｆ32：レンズ群Ｇ32の焦点距離According to a third aspect of the present invention, the third lens group includes one cemented lens, and G31 and G are sequentially arranged from the large conjugate side.
The lens group G31 includes two cemented surfaces of 32, and includes a cemented surface of a cemented lens at the end on the small conjugate side, and satisfies -30 <f31 / f32 <-4. However, f31: focal length of the lens group G31 in terms of air f32: focal length of the lens group G32.
【００１０】請求項４では、前記第３レンズ群は１個の
接合レンズを含み、該接合レンズは大きな共役側（Ｇ31
群側）を両面凹レンズで構成し、小さな共役側（Ｇ32群
側）を両面凸レンズで構成し、両レンズを接合して構成
するものである。In the fourth aspect, the third lens group includes one cemented lens, and the cemented lens has a large conjugate side (G31).
The group side) is a double-sided concave lens, the small conjugate side (G32 group side) is a double-sided convex lens, and both lenses are cemented together.
【００１１】請求項５では、前記第３レンズ群は１個の
接合レンズを含み、前記大きな共役側から順にＧ31，Ｇ
32の２群より構成され、レンズ群Ｇ31は前記小さな共役
側の端に接合レンズの接合面を含み、該接合面は大きな
共役側に凸であり、
ｎF＞ｎＢ
を満足するものである。
但し、ｎＦ：接合面の直前（大きな共役側）の屈折率
ｎB：接合面の直後（小さな共役側）の屈折率In the fifth aspect, the third lens group includes one cemented lens, and G31 and G are arranged in order from the large conjugate side.
The lens group G31 includes two cemented surfaces of 32, and the cemented surface of the cemented lens is included at the end on the small conjugate side. The cemented surface is convex on the large conjugate side and satisfies nF> nB. Here, nF: refractive index immediately before the bonding surface (large conjugate side) nB: immediately after the bonding surface (small conjugate side)
【００１２】請求項６では、前記第３レンズ群と前記小
さな共役側の像面との間に平行平板を挿入した状態で収
差補正したものである。In the sixth aspect, aberration is corrected with a parallel plate inserted between the third lens group and the image plane on the small conjugate side.
【００１３】請求項７では、前記絞り手段の開口径が可
変に構成されたものである。In the present invention, the aperture diameter of the diaphragm means is variable.
【００１４】請求項８では、光源と、光源の出射光を赤
・緑・青の３原色光に色分解する色分解手段と、前記３
原色光で照明される３個の画像表示デバイスと、該画像
表示デバイスに表示される３原色画像を合成する色合成
手段と、色合成された光束を拡大投写する投写レンズと
を備えた投写型表示装置であって、上記投写レンズとし
て請求項１記載のテレセントリックズームレンズを用い
たものである。According to an eighth aspect of the present invention, a light source, color separation means for separating the light emitted from the light source into three primary color lights of red, green and blue,
Projection type including three image display devices illuminated by primary color light, color synthesizing means for synthesizing the three primary color images displayed on the image display device, and a projection lens for magnifying and projecting the color-synthesized light flux A display device, wherein the telecentric zoom lens according to claim 1 is used as the projection lens.
【００１５】請求項９では、前記色合成手段として、前
記投写レンズの直前に、３原色の合成を行なう４分割構
成のダイクロイックプリズムを備えたものである。According to a ninth aspect of the present invention, as the color synthesizing means, a dichroic prism having a four-division structure for synthesizing the three primary colors is provided immediately before the projection lens.
【００１６】請求項１０では、前記絞り手段の開口径を
可変に構成したものである。According to a tenth aspect, the aperture diameter of the diaphragm means is variable.
【００１７】[0017]
【作用】本発明に係るテレセントリックズームレンズ
は、以上の構成により上記（ａ）〜（ｄ）の要求を満足
することができる。又、３群構成なので鏡筒構造が簡単
でよい。また第２群を移動させて変倍し、変倍によるピ
ントずれを全系の移動で補償する構成としたのでカム等
の特別な機構の必要がなくなりレンズ鏡筒回りの機構が
非常に簡単になる。また本発明の液晶投写型表示装置は
上記ズームレンズを投写レンズに採用するこで、短投写
距離，高解像で表示色むらが少なく、また歪曲収差，倍
率色収差がよく制御された良好な表示性能が得られる。The telecentric zoom lens according to the present invention can satisfy the above requirements (a) to (d) due to the above configuration. In addition, the lens barrel structure is simple because it has a three-group structure. Further, since the second lens group is moved to change the magnification and the focus shift due to the change of magnification is compensated by the movement of the entire system, a special mechanism such as a cam is not required and the mechanism around the lens barrel is very simple. Become. Further, in the liquid crystal projection display device of the present invention, by adopting the zoom lens as the projection lens, it is possible to obtain a good display with a short projection distance, a high resolution, little display color unevenness, and well controlled distortion and lateral chromatic aberration. Performance is obtained.
【００１８】[0018]
＜請求項１〜７＞図１，図２，図３，図４は各々本発明
の後述する数値実施例１，５，６，９のレンズ断面図で
ある。図１（ａ）は短焦点端、図１（ｂ）は長焦点端の
ズーム位置に対応している。また図２，図３，図４は短
焦点端のズーム位置を示している。図５（ａ），（ｂ）
ないし図１５（ａ），（ｂ）は各々後述する数値実施例
１ないし数値実施例１１の短焦点端，長焦点端の小さな
共役側でみた収差図である。球面収差図は(WL1=610nm,W
L2=546.1nm,WL3=470nm) の３波長について示し、非点収
差，歪曲収差は546.1nm（ｅ線）について示している。<Claims 1 to 7> FIGS. 1, 2, 3, and 4 are lens cross-sectional views of Numerical Examples 1, 5, 6, and 9 to be described later of the present invention. 1A corresponds to the zoom position at the short focus end, and FIG. 1B corresponds to the zoom position at the long focus end. Further, FIGS. 2, 3 and 4 show zoom positions at the short focus end. 5 (a), (b)
15 (a) and 15 (b) are aberration diagrams as viewed on the small conjugate side of the short focal end and the long focal end of Numerical Examples 1 to 11 described later, respectively. The spherical aberration diagram is (WL1 = 610nm, W
L2 = 546.1 nm, WL3 = 470 nm) for three wavelengths, and astigmatism and distortion for 546.1 nm (e line).
【００１９】図１ないし図４のレンズ断面図において、
Ｇ１は正の屈折力の第１群、Ｇ２は負の屈折力の第２
群、Ｇ３は正の屈折力の第３群、Ｇ３１は接合レンズの
接合面を最終面とするＧ３の前群、Ｇ３２は接合レンズ
の最終面以下のＧ３の後群、ＡＳＴは絞り面、Ｐは平行
平板、Ｓはスクリーン面、Ｉは液晶パネルの画像表示面
である。平行平板Ｐは本発明のテレセントリックズーム
レンズを液晶プロジェクタに適用する際には図１６で説
明したダイクロイックプリズム７、及び液晶パネルの投
写レンズ側基板（図示省略）に置き換えられる。In the lens sectional views of FIGS. 1 to 4,
G1 is the first group of positive refractive power, G2 is the second group of negative refractive power
G3 is a third group having a positive refractive power, G31 is a front group of G3 whose final surface is the cemented surface of the cemented lens, G32 is a rear group of G3 below the final surface of the cemented lens, AST is an aperture surface, P Is a parallel plate, S is a screen surface, and I is an image display surface of a liquid crystal panel. When the telecentric zoom lens of the present invention is applied to the liquid crystal projector, the parallel plate P is replaced with the dichroic prism 7 described in FIG. 16 and the projection lens side substrate (not shown) of the liquid crystal panel.
【００２０】スクリーン面Ｓと画像表示面Ｉとは共役関
係にあり、一般にはスクリーン面Ｓは大きな共役側に位
置し、画像表示面Ｉは小さな共役側に位置する。The screen surface S and the image display surface I are in a conjugate relationship, and generally, the screen surface S is located on the large conjugate side and the image display surface I is located on the small conjugate side.
【００２１】短焦点端から長焦点端への変倍は図１に矢
印で示すように第２群Ｇ２を画像表示面Ｉ側へ移動させ
ることで行っている。また変倍によるピントずれは、Ｇ
１，Ｇ２，Ｇ３の全系を一体的に移動することで合焦す
る。このように、本実施例の投写レンズは３群構成と単
純であり。しかも従来の４群構成以上の液晶プロジェク
タ用ズームレンズで一般的であった像面移動の補償成分
（コンペンセータ）を省略できるので、カム等の特別な
機構が簡素化できレンズ鏡筒回りの構造を非常に簡単に
できる。The zooming from the short focus end to the long focus end is performed by moving the second group G2 to the image display surface I side as shown by the arrow in FIG. Also, the focus shift due to zooming is G
Focusing is achieved by integrally moving the entire system of 1, G2, G3. As described above, the projection lens of this embodiment has a simple structure of three groups. Moreover, since the compensator (compensator) for image plane movement, which is generally used in the conventional zoom lens for a liquid crystal projector having four or more lens units, can be omitted, a special mechanism such as a cam can be simplified and a structure around the lens barrel can be formed. Very easy to do.
【００２２】本発明の投写レンズは、以下の条件式
（１）〜（４）を満足するように構成されている。
１．６＜ｆ1／ｆｗ＜２．８ （１）
−１．４＜ｆ2／ｆｗ＜−０．６ （２）
０．９＜ｆ3／ｆｗ＜１．５ （３）
０．４＜Ｌ23ｗ／ｆｗ＜０．８ （４）
但し、ｆ1 ：第１レンズ群の焦点距離
ｆ2 ：第２レンズ群の焦点距離
ｆ3 ：第３レンズ群の焦点距離
ｆｗ ：短焦点端での全系の焦点距離
ｆ23ｗ：短焦点端での第２レンズ群と第３レンズ群との
間隔
次に、上記した各条件式の意味について説明する。The projection lens of the present invention is constructed so as to satisfy the following conditional expressions (1) to (4). 1.6 <f1 / fw <2.8 (1) -1.4 <f2 / fw <-0.6 (2) 0.9 <f3 / fw <1.5 (3) 0.4 <L23w / fw <0.8 (4) where f1: focal length of the first lens group f2: focal length of the second lens group f3: focal length of the third lens group fw: focal length f23w of the entire system at the short focal end Interval between the second lens group and the third lens group at the short focal end Next, the meanings of the above conditional expressions will be described.
【００２３】（１）式の上限を越えると、レンズ全長が
大きくなり、また前玉の径も大きくなってレンズコスト
が高くなる。また下限をこえると第１レンズ群で発生す
る諸収差が大きくなりその補正が困難になる。If the upper limit of the expression (1) is exceeded, the total lens length becomes large and the diameter of the front lens also becomes large, resulting in an increase in lens cost. On the other hand, if the value goes below the lower limit, various aberrations occurring in the first lens group become large and it becomes difficult to correct them.
【００２４】（２）式の上限を越えるとレンズ群Ｇ２中
の負レンズの曲率半径が小さくなり、Ｇ２で発生する諸
収差が大きくなって補正が困難になる。下限を越える
と、変倍のためのＧ２の移動量が大きくなり、レンズ全
長が大きくなりすぎる。When the value exceeds the upper limit of the expression (2), the radius of curvature of the negative lens in the lens group G2 becomes small, and various aberrations generated in G2 become large, which makes correction difficult. When the value goes below the lower limit, the amount of movement of G2 for zooming becomes large, and the total lens length becomes too large.
【００２５】（３）式の上限を越えるとレンズ全長が増
大しすぎる。下限を越えるとレンズ群Ｇ３に発生する諸
収差が増大しその補正が困難になる。If the upper limit of expression (3) is exceeded, the total lens length will increase too much. When the value goes below the lower limit, various aberrations occurring in the lens group G3 increase and it becomes difficult to correct them.
【００２６】（４）式は（１）〜（３）式と相まって諸
収差を良好に保ち、かつレンズ全長の増大を抑える為の
条件である。上限を越えるとレンズ全長が増大し、レン
ズ系全体が大形化してコストが高くなる。下限を越える
とレンズ全長は小さくなるが発生する諸収差が増大し、
補正が困難化する。The expression (4) is a condition for keeping various aberrations favorable and suppressing an increase in the total lens length in combination with the expressions (1) to (3). If the upper limit is exceeded, the total length of the lens will increase, the overall lens system will become large, and the cost will increase. When the value goes below the lower limit, the total lens length decreases, but various aberrations increase,
Correction becomes difficult.
【００２７】本発明の目的とするテレセントリックズー
ムレンズは以上の諸条件を満足することで達成される
が、更に次の条件式（５），（６）を満足させることで
テレセントリック性が良好になり、かつ絞りの配置の点
で好ましくなる。The telecentric zoom lens which is the object of the present invention can be achieved by satisfying the above-mentioned various conditions, and by satisfying the following conditional expressions (5) and (6), the telecentricity is improved. In addition, it is preferable in terms of arrangement of the diaphragm.
【００２８】
｜△／ｆ3｜＜０．１５ （５）
但し、Δは第３レンズ群Ｇ３の大きな共役側の近軸焦点
位置から絞り手段に至る距離。
−３０＜ｆ31／ｆ32＜−４ （６）
但し、ｆ31はレンズ群Ｇ３の前群Ｇ31の空気換算焦点距
離であり、ｆ32はレンズ群Ｇ３の後群Ｇ32の焦点距離で
ある。図１〜図４に示すように、Ｇ31はＧ３の大きな共
役側から接合レンズの接合面までを含み、Ｇ32は接合レ
ンズの小さな共役側の面以降のＧ３の面から構成されて
いる。| Δ / f3 | <0.15 (5) where Δ is the distance from the paraxial focal position on the large conjugate side of the third lens group G3 to the diaphragm means. −30 <f31 / f32 <−4 (6) where f31 is the air equivalent focal length of the front group G31 of the lens group G3, and f32 is the focal length of the rear group G32 of the lens group G3. As shown in FIGS. 1 to 4, G31 includes from the large conjugate side of G3 to the cemented surface of the cemented lens, and G32 is composed of the surface of G3 after the minor conjugate side of the cemented lens.
【００２９】式（５）の上限を越えると、絞り位置がＧ
３群の大きな共役側の近軸焦点位置から遠くなりすぎる
ので、小さな共役側の軸外主光線の光軸に対する傾角が
増大しテレセントリック性が保てなくなる。If the upper limit of equation (5) is exceeded, the diaphragm position will be G
Since it is too far from the paraxial focal position on the large conjugate side of the three groups, the tilt angle of the small off-axis principal ray on the conjugate side with respect to the optical axis increases, and the telecentricity cannot be maintained.
【００３０】式（６）はＧ３群の前群と後群の焦点距離
の比を規定する条件式である。Ｇ31群は負の屈折力を有
し、Ｇ32群は正の屈折力を有しており、Ｇ３群は全体と
して逆テレフォト型(Inverted Telephoto Type) の構成
となっている。これによりＧ３群は大きな共役側の主面
が画像表示面Ｉ側に遠ざかっており、絞りＡＳＴをＧ３
群の大きな共役側近傍に配置してもテレセントリック性
が確保できる。式（６）の上限を越えるとＧ31群の屈折
力が強くなりすぎるので絞りＡＳＴの配置が困難にな
り、また諸収差が増大してその補正が困難になる。ま
た、式（６）の下限を越えるとＧ３群の逆テレフォト型
の構成が弱くなり、（５）を満足する絞りＡＳＴの位置
がＧ３群より遠ざかりすぎてレンズ全長が増大する。Expression (6) is a conditional expression that defines the ratio of the focal lengths of the front group and the rear group of the G3 group. The G31 group has a negative refracting power, the G32 group has a positive refracting power, and the G3 group as a whole is of an inverted telephoto type. As a result, the main surface of the large conjugate side of the G3 group is distant from the image display surface I side, and the stop AST is set to G3.
Telecentricity can be assured even if it is arranged near the large conjugate side of the group. When the value exceeds the upper limit of the expression (6), the refractive power of the G31 group becomes too strong, which makes it difficult to dispose the diaphragm AST and makes it difficult to correct various aberrations. On the other hand, if the lower limit of Expression (6) is exceeded, the inverse telephoto type configuration of the G3 group becomes weak, and the position of the diaphragm AST that satisfies (5) becomes too far from the G3 group, increasing the total lens length.
【００３１】このようにＧ31群，Ｇ32群からなるレンズ
群Ｇ３を逆テレフォト型とし、式（６）を満足させなが
ら本レンズ系を有効なものとするために、Ｇ３群中の接
合レンズは大きな共役側（Ｇ31群側）を両面凹レンズで
構成し、小さな共役側（Ｇ32群側）を両面凸レンズで構
成し両レンズを接合することが望ましく、後述する各数
値実施例ではこの構成としている。さらに、接合面（Ｇ
31群の最終面）は負の屈折力を有することが望ましい。
そのために、各数値実施例では接合面を大きな共役側に
凸とした上で、式（７）の条件により接合面の屈折力を
負としている。
ｎF＞ｎB （７）
但し、ｎF は接合面の直前（大きな共役側）の屈折率で
あり、ｎBは接合面の直後（小さな共役側）の屈折率で
ある。As described above, the lens group G3 including the G31 group and the G32 group is the inverse telephoto type, and in order to make the present lens system effective while satisfying the expression (6), the cemented lens in the G3 group is large. It is desirable that the conjugate side (G31 group side) be configured with a double-sided concave lens, and the small conjugate side (G32 group side) be configured with a double-sided convex lens, and both lenses be cemented. This configuration is used in each numerical example described later. Furthermore, the joint surface (G
It is desirable that the final surface of group 31) has a negative refractive power.
Therefore, in each of the numerical examples, the cemented surface is made to be convex toward the large conjugate side, and the refractive power of the cemented surface is made negative according to the condition of Expression (7). nF> nB (7) where nF is the refractive index immediately before the bonding surface (large conjugate side), and nB is the refractive index immediately after the bonding surface (small conjugate side).
【００３２】次に本発明の数値実施例を示す。数値実施
例１ないし数値実施例１１に記載した記号の意味は以下
の通りである。なお、焦点距離，倍率はｅ線（５４６．
１ｎｍ）における値である。
ｆ：投写レンズ全系の焦点距離
Ｆ：基準投写倍率における、実効Ｆ値（小さな共役側）
ω：投写画角（全角）
Ｍ：基準投写倍率
ｆ1：第１レンズ群Ｇ1の焦点距離
ｆ2：第２レンズ群Ｇ2の焦点距離
ｆ3：第３レンズ群Ｇ3の焦点距離
ｆ31：Ｇ３群の前群Ｇ31の空気換算焦点距離
ｆ32：Ｇ３群の後群Ｇ32の焦点距離
ｆw：短焦点端の全系の焦点距離
Ｌ23w：Ｇ２群とＧ３群との短焦点端における間隔
Δ：Ｇ３群の大きな共役側の近軸焦点から絞りＡＳＴま
での距離
ｍ：スクリーン側から順次数えた面番号
ｒi：スクリーン側から数えて第ｉ番目のレンズ面の曲
率半径
ｄi：スクリーン側から数えて第ｉ番目のレンズ成分の
厚み及び空気間隔
ｎi：スクリーン側から数えて第ｉ番目のレンズ成分の
波長５８７．６ｎｍ
（ｄ線）に於ける屈折率
νi：スクリーン側から数えて第ｉ番目のレンズ成分の
アッベ数
ＡＳＴ：絞り面
ＰＬＡＴＥ：平行平板Next, numerical examples of the present invention will be shown. The meanings of the symbols described in Numerical Examples 1 to 11 are as follows. The focal length and the magnification are e-line (546.
1 nm). f: focal length of the entire projection lens system F: effective F value at the standard projection magnification (small conjugate side) ω: projection angle of view (full angle) M: standard projection magnification f1: focal length of the first lens group G1 f2: first Focal length f3 of the second lens group G2: Focal length f31 of the third lens group G3: Air-equivalent focal length f32 of front group G31 of G3 group: Focal length fw of rear group G32 of G3 group Focal length L23w: Distance between short focal ends of G2 group and G3 group Δ: Distance from paraxial focus on large conjugate side of G3 group to diaphragm AST m: Surface number sequentially counted from screen side ri: Counted from screen side Radius of curvature of the i-th lens surface di: thickness of the i-th lens component counted from the screen side and air spacing ni: wavelength of the i-th lens component counted from the screen side 587.6 nm (d line) Refractive Index νi: From the screen side Abbe number of i-th lens component counted AST: diaphragm surface PLATE: parallel plate
【００３３】＜数値実施例１＞本実施例の断面図を図１
に示す。f=86.50〜138.40 F=3.5
ω=49.4°〜31.9° M=32.3〜20.6
m ri di ni νi
1 125.67353 2.80 1.784715 25.70
2 84.57319 25.46 1.516798 64.20
3 411.91267 0.30
4 187.07677 9.94 1.712999 53.94
5 698.05516 a
6 204.60959 2.80 1.743299 49.22
7 43.21994 19.71
8 268.74804 2.80 1.516798 64.20
9 40.15751 12.00 1.806104 40.73
10 119.04194 b
11 INFINITY 2.00 AST
12 44.19456 10.00 1.784715 25.70
13 48.27936 2.00
14 69.23705 8.00 1.603110 60.69
15 -9189.64273 33.93
16 -30.76288 2.80 1.784715 25.70
17 123.93487 21.56 1.516798 64.20
18 -52.11647 0.30
19 -240.81505 11.00 1.785896 43.93
20 -86.34464 0.30
21 145.48974 19.00 1.743299 49.22
22 -237.66236 24.41
23 INFINITY 71.00 1.516798 64.20 PLATE
24 INFINITY
＜可変間隔＞
f=86.50 f=138.40
a 3.00 45.90
b 50.30 7.39
f1/fw = 2.5234 f2/fw = -1.0923
f3/fw = 1.2179 L23w/fw = 0.6046
△/f3 = 0.106 f31/f32 = -11.5Numerical Embodiment 1 FIG. 1 is a sectional view of this embodiment.
Shown in. f = 86.50 to 138.40 F = 3.5 ω = 49.4 ° to 31.9 ° M = 32.3 to 20.6 m ri di ni νi 1 125.67353 2.80 1.784715 25.70 2 84.57319 25.46 1.516798 64.20 3 411.91267 0.30 4 187.07677 9.94 1.712999 53.94 5 698.05516 a 6 204.60959 2. 49.22 7 43.21994 19.71 8 268.74804 2.80 1.516798 64.20 9 40.15751 12.00 1.806104 40.73 10 119.04194 b 11 INFINITY 2.00 AST 12 44.19456 10.00 1.784715 25.70 13 48.27936 2.00 14 69.23705 8.00 1.603110.30110. -52.11647 0.30 19 -240.81505 11.00 1.785896 43.93 20 -86.34464 0.30 21 145.48974 19.00 1.743299 49.22 22 -237.66236 24.41 23 INFINITY 71.00 1.516798 64.20 PLATE 24 INFINITY <variable interval> f = 86.50 f = 138.40 a 3.00 45.90 b 50.30 7.39 2.5234 f2 / fw = -1.0923 f3 / fw = 1.2179 L23w / fw = 0.6046 △ / f3 = 0.106 f31 / f32 = -11.5
【００３４】＜数値実施例２＞ f=86.50〜138.39 F=3.5 ω=49.4°〜31.9° M=32.3〜20.6 m ri di ni νi 1 124.07478 2.80 1.784715 25.70 2 85.78888 26.24 1.516798 64.20 3 582.14053 0.30 4 198.86457 8.39 1.712999 53.94 5 515.73652 a 6 207.39088 2.80 1.743299 49.22 7 43.50468 19.11 8 318.52869 2.80 1.516798 64.20 9 40.56893 12.00 1.806104 40.73 10 129.02090 b 11 INFINITY 2.00 AST 12 44.51727 10.00 1.784715 25.70 13 47.09149 2.00 14 68.44778 8.00 1.638542 55.45 15 1545.82345 34.38 16 -31.80698 2.80 1.784715 25.70 17 125.65955 21.62 1.516798 64.20 18 -52.10327 0.30 19 -230.42573 11.00 1.719998 50.34 20 -83.47437 0.30 21 145.90257 19.00 1.785896 43.93 22 -270.49843 25.08 23 INFINITY 71.00 1.516798 64.20 PLATE 24 INFINITY ＜可変間隔＞ f=86.50 f=138.39 a 3.00 46.81 b 51.17 7.35 f1/fw = 2.5681 f2/fw = -1.1161 f3/fw = 1.2185 L23w/fw = 0.6147 △/f3 = 0.104 f31/f32 = -10.3<Numerical Example 2> f = 86.50 ~ 138.39 F = 3.5 ω = 49.4 ° to 31.9 ° M = 32.3 to 20.6 m ri di ni νi 1 124.07478 2.80 1.784715 25.70 2 85.78888 26.24 1.516798 64.20 3 582.14053 0.30 4 198.86457 8.39 1.712999 53.94 5 515.73652 a 6 207.39088 2.80 1.743299 49.22 7 43.50468 19.11 8 318.52869 2.80 1.516798 64.20 9 40.56893 12.00 1.806104 40.73 10 129.02090 b 11 INFINITY 2.00 AST 12 44.51727 10.00 1.784715 25.70 13 47.09149 2.00 14 68.44778 8.00 1.638542 55.45 15 1545.82 345 34.38 16 -31.80698 2.80 1.784715 25.70 17 125.65955 21.62 1.516798 64.20 18 -52.10327 0.30 19 -230.42573 11.00 1.719998 50.34 20 -83.47437 0.30 21 145.90257 19.00 1.785896 43.93 22 -270.49843 25.08 23 INFINITY 71.00 1.516798 64.20 PLATE 24 INFINITY <Variable interval> f = 86.50 f = 138.39 a 3.00 46.81 b 51.17 7.35 f1 / fw = 2.5681 f2 / fw = -1.1161 f3 / fw = 1.2185 L23w / fw = 0.6147 △ / f3 = 0.104 f31 / f32 = -10.3
【００３５】＜数値実施例３＞ f=86.50〜138.40 F=3.5 ω=49.4°〜32.0° M=32.3〜20.6 m ri di ni νi 1 132.29455 3.00 1.784715 25.70 2 88.35353 25.48 1.516798 64.20 3 632.70478 0.30 4 160.49160 9.95 1.719998 50.34 5 429.33397 a 6 206.68261 3.00 1.743299 49.22 7 41.98060 20.29 8 274.21895 3.00 1.518233 58.96 9 39.60209 12.00 1.806099 33.27 10 114.44343 b 11 INFINITY 2.00 AST 12 48.51684 10.00 1.743299 49.22 13 65.60146 2.00 14 158.42928 8.00 1.696802 55.46 15 -301.01477 34.82 16 -31.73440 3.00 1.784715 25.70 17 130.13888 21.99 1.516798 64.20 18 -53.05117 0.30 19 -213.11755 11.00 1.712999 53.94 20 -86.36616 0.30 21 183.03856 19.00 1.806104 40.73 22 -189.92627 30.51 23 INFINITY 71.00 1.516798 64.20 PLATE 24 INFINITY ＜可変間隔＞ f=86.50 f=138.40 a 3.00 42.86 b 47.57 7.69 f1/fw = 2.3741 f2/fw = -1.0151 f3/fw = 1.2274 L23w/fw = 0.5730 △/f3 = 0.095 f31/f32 = -11.4<Numerical Example 3> f = 86.50 ~ 138.40 F = 3.5 ω = 49.4 ° 〜32.0 ° M = 32.3〜20.6 m ri di ni νi 1 132.29455 3.00 1.784715 25.70 2 88.35353 25.48 1.516798 64.20 3 632.70478 0.30 4 160.49 160 9.95 1.719998 50.34 5 429.33397 a 6 206.68261 3.00 1.743299 49.22 7 41.98060 20.29 8 274.21895 3.00 1.518233 58.96 9 39.60209 12.00 1.806099 33.27 10 114.44343 b 11 INFINITY 2.00 AST 12 48.51684 10.00 1.743299 49.22 13 65.60146 2.00 14 158.42928 8.00 1.696802 55.46 15 -301.01477 34.82 16 -31.73440 3.00 1.784715 25.70 17 130.13888 21.99 1.516798 64.20 18 -53.05117 0.30 19 -213.11755 11.00 1.712999 53.94 20 -86.36616 0.30 21 183.03856 19.00 1.806104 40.73 22 -189.92627 30.51 23 INFINITY 71.00 1.516798 64.20 PLATE 24 INFINITY <Variable interval> f = 86.50 f = 138.40 a 3.00 42.86 b 47.57 7.69 f1 / fw = 2.3741 f2 / fw = -1.0151 f3 / fw = 1.2274 L23w / fw = 0.5730 △ / f3 = 0.095 f31 / f32 = -11.4
【００３６】＜数値実施例４＞ f=86.50〜138.40 Ｆ＝３．５ ω＝４９．４°〜32.0° M=32.3〜20.6 m ri di ni νi 1 133.88612 3.00 1.784715 25.70 2 89.24953 24.07 1.516798 64.20 3 547.95995 0.30 4 161.29463 10.20 1.719998 50.34 5 479.64046 a 6 199.10905 3.00 1.743299 49.22 7 41.66973 19.91 8 227.60379 3.00 1.518233 58.96 9 38.57135 12.00 1.806099 33.27 10 106.17264 b 11 INFINITY 2.00 AST 12 52.23919 10.00 1.751322 47.14 13 70.41211 2.00 14 207.55046 8.00 1.701705 54.52 15 -262.13357 36.22 16 -34.45479 3.00 1.785000 25.80 17 137.43059 21.90 1.519988 67.08 18 -54.78639 0.30 19 -204.19220 11.29 1.713000 53.90 20 -86.27577 0.30 21 176.09439 18.96 1.806000 40.70 22 -213.46466 33.15 23 INFINITY 71.00 1.516798 64.20 PLATE 24 INFINITY ＜可変間隔＞ f=86.50 f=138.40 a 3.00 43.10 b 47.55 7.45 f1/fw = 2.3812 f2/fw = -1.0204 f3/fw = 1.2260 L23w/fw = 0.5729 △/f3 = 0.092 f31/f32 = -8.0<Numerical Example 4> f = 86.50 to 138.40 F = 3.5 ω = 49.4 ° to 32.0 ° M = 32.3 to 20.6 m ri di ni νi 1 133.88612 3.00 1.784715 25.70 2 89.24953 24.07 1.516798 64.20 3 547.95995 0.30 4 161.29463 10.20 1.719998 50.34 5 479.64046 a 6 199.10905 3.00 1.743299 49.22 7 41.66973 19.91 8 227.60379 3.00 1.518233 58.96 9 38.57135 12.00 1.806099 33.27 10 106.17264 b 11 INFINITY 2.00 AST 12 52.23919 10.00 1.751322 47.14 13 70.41211 2.00 14 207.55046 8.00 1.701705 54.52 15 -262.13357 36.22 16 -34.45479 3.00 1.785000 25.80 17 137.43059 21.90 1.519988 67.08 18 -54.78639 0.30 19 -204.19220 11.29 1.713000 53.90 20 -86.27577 0.30 21 176.09439 18.96 1.806000 40.70 22 -213.46466 33.15 23 INFINITY 71.00 1.516798 64.20 PLATE 24 INFINITY <Variable interval> f = 86.50 f = 138.40 a 3.00 43.10 b 47.55 7.45 f1 / fw = 2.3812 f2 / fw = -1.0204 f3 / fw = 1.2260 L23w / fw = 0.5729 △ / f3 = 0.092 f31 / f32 = -8.0
【００３７】＜数値実施例５＞本実施例の断面図を図２
に示す。
f=86.50〜138.40 F=3.5
ω=49.4°〜32.0° M=32.3〜20.6
m ri di ni νi
1 118.23465 2.80 1.784715 25.70
2 81.67037 27.02 1.516798 64.20
3 617.52342 0.20
4 169.34983 7.99 1.719998 50.34
5 342.01528 a
6 213.56823 2.80 1.743299 49.22
7 42.62124 19.44
8 375.87834 2.80 1.518233 58.96
9 40.12589 12.00 1.777811 36.24
10 144.59870 b
11 INFINITY 2.00 AST
12 55.64841 10.00 1.803848 40.91
13 46.39936 1.00
14 55.35973 6.00 1.670029 47.25
15 -285.48458 10.19
16 88.43117 5.00 1.620040 36.37
17 50.26836 25.80
18 -34.76104 2.80 1.784715 25.70
19 439.18485 19.57 1.589128 61.25
20 -53.08130 0.20
21 -232.45781 13.00 1.696999 48.51
22 -82.29081 0.20
23 177.87856 17.00 1.712999 53.94
24 -211.11085 32.61
25 INFINITY 71.00 1.516798 64.20 PLATE
26 INFINITY
＜可変間隔＞
f=86.50 f=138.40
a 3.00 44.72
b 49.18 7.46
f1/fw = 2.4731 f2/fw = -1.0645
f3/fw = 1.2303 L23w/fw = 0.5917
△/f3 = 0.088 f31/f32 = -7.0<Numerical Embodiment 5> FIG. 2 is a sectional view of the present embodiment.
Shown in. f = 86.50 to 138.40 F = 3.5 ω = 49.4 ° to 32.0 ° M = 32.3 to 20.6 m ri di ni νi 1 118.23465 2.80 1.784715 25.70 2 81.67037 27.02 1.516798 64.20 3 617.52342 0.20 4 169.34983 7.99 1.719998 50.34 5 342.01528 a 6 213.56823 2. 49.22 7 42.62124 19.44 8 375.87834 2.80 1.518233 58.96 9 40.12589 12.00 1.777811 36.24 10 144.59870 b 11 INFINITY 2.00 AST 12 55.64841 10.00 1.803848 40.91 13 46.39936 1.00 14 55.35.37 17.50 1.784715 25.70 19 439.18485 19.57 1.589128 61.25 20 -53.08130 0.20 21 -232.45781 13.00 1.696999 48.51 22 -82.29081 0.20 23 177.87856 17.00 1.712999 53.94 24 -211.11085 32.61 25 INFINITY 71.00 1.516798 64.20 PLATE 26 INFINIT86.30 f50. 44.72 b 49.18 7.46 f1 / fw = 2.4731 f2 / fw = -1.0645 f3 / fw = 1.2303 L23w / fw = 0.5917 △ / f3 = 0.088 f31 / f32 = -7.0
【００３８】＜数値実施例６＞本実施例の断面図を図３
に示す。
f=86.50〜138.40 F=3.5
ω=49.3°〜32.0° M=32.3〜20.3
m ri di ni νi
1 122.68530 17.00 1.756999 47.71
2 1502.29532 0.30
3 140.63846 17.00 1.487489 70.44
4 -333.83302 4.00 1.784715 25.70
5 315.92917 a
6 312.62512 2.80 1.712999 53.94
7 37.53981 15.60
8 3220.46539 3.00 1.531720 48.84
9 36.69915 14.91 1.806099 33.27
10 151.06263 b
11 INFINITY 2.00 AST
12 109.56427 10.00 1.638542 55.45
13 -107.62461 21.99
14 -47.44025 5.00 1.516798 64.20
15 -69.52574 0.20
16 -325.90555 5.00 1.717359 29.50
17 171.04783 10.87
18 -74.88566 2.80 1.728251 28.32
19 110.84506 21.00 1.516798 64.20
20 -75.24197 0.20
21 -1146.60466 13.00 1.719998 50.34
22 -115.01993 0.20
23 184.01021 20.00 1.712999 53.94
24 -177.82602 33.39
25 INFINITY 71.00 1.516798 64.20 PLATE
26 INFINITY
＜可変間隔＞
f=86.50 f=138.40
a 3.00 27.57
b 50.13 5.00
f1/fw = 1.8701 f2/fw = -0.8267
f3/fw = 1.1194 L23w/fw = 0.6027
△/f3 = 0.087 f31/f32 = -7.1<Numerical Embodiment 6> FIG. 3 is a sectional view of the present embodiment.
Shown in. f = 86.50 to 138.40 F = 3.5 ω = 49.3 ° to 32.0 ° M = 32.3 to 20.3 m ri di ni νi 1 122.68530 17.00 1.756999 47.71 2 1502.29532 0.30 3 140.63846 17.00 1.487489 70.44 4 -333.83302 4.00 1.784715 25.70 5 315.92917 a 6 312.62512 1.712999 53.94 7 37.53981 15.60 8 3220.46539 3.00 1.531720 48.84 9 36.69915 14.91 1.806099 33.27 10 151.06263 b 11 INFINITY 2.00 AST 12 109.56427 10.00 1.638542 55.45 13 -107.62461 17.555 29.50 1.50.370.50 15.50 -69.52574 18 -74.88566 2.80 1.728251 28.32 19 110.84506 21.00 1.516798 64.20 20 -75.24197 0.20 21 -1146.60466 13.00 1.719998 50.34 22 -115.01993 0.20 23 184.01021 20.00 1.712999 53.94 24 -177.82602 33.39 f INFINITY 71.00 1.516798 64.20 PLATE 26 INFINITY 71.00 1.516798 64.20 PLATE 26 INFINITY = 138.40 a 3.00 27.57 b 50.13 5.00 f1 / fw = 1.8701 f2 / fw = -0.8267 f3 / fw = 1.1194 L23w / fw = 0.6027 △ / f3 = 0.087 f31 / f32 = -7.1
【００３９】＜数値実施例７＞ f=86.50〜138.40 F=3.5 ω=49.1°〜31.8° M=32.3〜20.3 m ri di ni νi 1 122.19748 17.00 1.756999 47.71 2 1388.20956 0.30 3 140.16029 17.00 1.487489 70.44 4 -339.17276 4.00 1.784715 25.70 5 313.82829 a 6 304.77475 2.80 1.712999 53.94 7 37.46640 15.58 8 4784.21263 3.00 1.531720 48.84 9 36.68044 14.99 1.806099 33.27 10 152.41023 b 11 INFINITY 2.00 AST 12 102.60055 10.00 1.638542 55.45 13 -110.43771 22.39 14 -48.66046 5.00 1.518233 58.96 15 -73.40170 0.20 16 -259.94850 5.00 1.717359 29.50 17 199.03510 10.27 18 -74.32880 2.80 1.740774 27.77 19 108.07447 21.00 1.516798 64.20 20 -73.77760 0.20 21 -1099.00216 13.00 1.719998 50.34 22 -112.85365 0.20 23 172.10418 20.00 1.719998 50.34 24 -193.32263 31.22 25 INFINITY 71.00 1.516798 64.20 PLATE 26 INFINITY ＜可変間隔＞ f=86.50 f=138.40 a 3.00 27.57 b 50.28 5.00 f1/fw = 1.8716 f2/fw = -0.8278 f3/fw = 1.1183 L23w/fw = 0.6043 △/f3 = 0.089 f31/f32 = -7.8<Numerical Example 7> f = 86.50 ~ 138.40 F = 3.5 ω = 49.1 ° 〜31.8 ° M = 32.3〜20.3 m ri di ni νi 1 122.19748 17.00 1.756999 47.71 2 1388.20956 0.30 3 140.16029 17.00 1.487489 70.44 4 -339.17276 4.00 1.784715 25.70 5 313.82829 a 6 304.77475 2.80 1.712999 53.94 7 37.46640 15.58 8 4784.21263 3.00 1.531720 48.84 9 36.68044 14.99 1.806099 33.27 10 152.4 1023 b 11 INFINITY 2.00 AST 12 102.60055 10.00 1.638542 55.45 13 -110.43771 22.39 14 -48.66046 5.00 1.518233 58.96 15 -73.40170 0.20 16 -259.94850 5.00 1.717359 29.50 17 199.03510 10.27 18 -74.32880 2.80 1.740774 27.77 19 108.07447 21.00 1.516798 64.20 20 -73.77760 0.20 21 -1099.00216 13.00 1.719998 50.34 22 -112.85365 0.20 23 172.10418 20.00 1.719998 50.34 24 -193.32263 31.22 25 INFINITY 71.00 1.516798 64.20 PLATE 26 INFINITY <Variable interval> f = 86.50 f = 138.40 a 3.00 27.57 b 50.28 5.00 f1 / fw = 1.8716 f2 / fw = -0.8278 f3 / fw = 1.1183 L23w / fw = 0.6043 △ / f3 = 0.089 f31 / f32 = -7.8
【００４０】＜数値実施例８＞ f=86.49〜138.39 F=3.5 ω=49.4°〜32.0° M=32.3〜20.6 m ri di ni νi 1 125.91041 17.00 1.757448 46.27 2 1589.30729 0.30 3 141.47938 17.00 1.491908 69.86 4 -344.90091 4.00 1.785800 26.17 5 305.02501 a 6 310.03760 2.80 1.713000 53.90 7 38.68587 17.09 8 657.45255 3.00 1.537897 49.20 9 36.77636 13.80 1.796699 32.51 10 137.03021 b 11 INFINITY 2.00 AST 12 115.03073 10.00 1.642929 58.40 13 -107.30142 23.17 14 -47.91319 5.00 1.517456 55.52 15 -75.07308 0.20 16 -243.20014 5.00 1.717570 28.58 17 191.29753 9.70 18 -83.77650 2.80 1.738427 27.60 19 116.96315 21.00 1.516438 67.40 20 -79.92047 0.20 21 -1192.14717 13.00 1.730598 50.48 22 -111.55991 0.20 23 203.37942 20.00 1.734258 49.84 24 -174.14365 35.00 25 INFINITY 71.00 1.516798 64.20 PLATE 26 INFINITY ＜可変間隔＞ f=86.49 f=138.39 a 3.00 28.68 b 49.74 5.00 f1/fw = 1.9226 f2/fw = -0.8441 f3/fw = 1.1230 L23w/fw = 0.5982 △/f3 = 0.085 f31/f32 = -6.7<Numerical Example 8> f = 86.49 ~ 138.39 F = 3.5 ω = 49.4 ° 〜32.0 ° M = 32.3〜20.6 m ri di ni νi 1 125.91041 17.00 1.757448 46.27 2 1589.30729 0.30 3 141.47938 17.00 1.491908 69.86 4 -344.90091 4.00 1.785800 26.17 5 305.02501 a 6 310.03760 2.80 1.713000 53.90 7 38.68587 17.09 8 657.45255 3.00 1.537897 49.20 9 36.77636 13.80 1.796699 32.51 10 137.03021 b 11 INFINITY 2.00 AST 12 115.03073 10.00 1.642929 58.40 13 -107.30142 23.17 14 -47.91319 5.00 1.517456 55.52 15 -75.07308 0.20 16 -243.20014 5.00 1.717570 28.58 17 191.29753 9.70 18 -83.77650 2.80 1.738427 27.60 19 116.96315 21.00 1.516438 67.40 20 -79.92047 0.20 21 -1192.14717 13.00 1.730598 50.48 22 -111.55991 0.20 23 203.37942 20.00 1.734258 49.84 24 -174.14365 35.00 25 INFINITY 71.00 1.516798 64.20 PLATE 26 INFINITY <Variable interval> f = 86.49 f = 138.39 a 3.00 28.68 b 49.74 5.00 f1 / fw = 1.9226 f2 / fw = -0.8441 f3 / fw = 1.1230 L23w / fw = 0.5982 △ / f3 = 0.085 f31 / f32 = -6.7
【００４１】＜数値実施例９＞本実施例の断面図を図４
に示す。
f=86.50〜138.40 F=3.5
ω=49.4°〜32.1° M=32.3〜20.6
m ri di ni νi
1 129.89548 22.00 1.716997 47.96
2 -787.67881 2.14
3 -480.53082 7.00 1.516798 64.20
4 -255.30804 4.00 1.755198 27.53
5 -4334.86218 a
6 130.46471 2.20 1.744001 44.72
7 37.85032 16.89
8 713.08743 3.00 1.487489 70.44
9 36.03515 12.02 1.749497 35.27
10 132.91566 b
11 INFINITY 1.96 AST
12 58.54179 8.81 1.516798 64.20
13 -100.16230 16.39
14 -38.59435 4.89 1.516798 64.20
15 -53.95439 0.20
16 -236.64161 4.89 1.755198 27.53
17 70.36245 18.81
18 -266.05833 2.00 1.698944 30.05
19 75.25389 33.27 1.638542 55.45
20 -84.97013 0.20
21 171.74823 29.36 1.696999 48.51
22 -138.59026 40.38
23 INFINITY 71.00 1.516798 64.20 PLATE
24 INFINITY
＜可変間隔＞
f=86.50 f=138.40
a 3.00 43.07
b 46.97 5.00
f1/fw = 2.4513 f2/fw = -1.0438
f3/fw = 1.1915 L23w/fw = 0.5656
△/f3 = 0.056 f31/f32 = -14.2<Numerical Embodiment 9> FIG. 4 is a sectional view of this embodiment.
Shown in. f = 86.50 to 138.40 F = 3.5 ω = 49.4 ° to 32.1 ° M = 32.3 to 20.6 m ri di ni νi 1 129.89548 22.00 1.716997 47.96 2 -787.67881 2.14 3 -480.53082 7.00 1.516798 64.20 4 -255.30804 4.00 1.755198 27.53 5 -4334.86218 a 6 130.46471 2.20 1.744001 44.72 7 37.85032 16.89 8 713.08743 3.00 1.487489 70.44 9 36.03515 12.02 1.749497 35.27 10 132.91566 b 11 INFINITY 1.96 AST 12 58.54179 8.81 1.516798 64.20 13 -100.16230 16.15 16 17 70.36245 18.81 18 -266.05833 2.00 1.698944 30.05 19 75.25389 33.27 1.638542 55.45 20 -84.97013 0.20 21 171.74823 29.36 1.696999 48.51 22 -138.59026 40.38 23 INFINITY 71.00 1.516798 64.20 PLATE 24 INFINITY 5.00 f1 / fw = 2.4513 f2 / fw = -1.0438 f3 / fw = 1.1915 L23w / fw = 0.5656 △ / f3 = 0.056 f31 / f32 = -14.2
【００４２】＜数値実施例１０＞ f=86.50〜138.40 F=3.5 ω=49.4°〜32.1° M=32.3〜20.6 m ri di ni νi 1 134.01760 22.00 1.696999 48.51 2 -782.81481 2.00 3 -522.12329 7.00 1.581436 40.89 4 -197.14382 4.00 1.755198 27.53 5 -1732.74331 a 6 136.44705 2.00 1.700301 47.84 7 37.79143 17.60 8 358.72478 3.00 1.487489 70.44 9 35.30977 12.00 1.749497 35.27 10 110.81996 b 11 INFINITY 1.96 AST 12 58.54179 8.81 1.516798 64.20 13 -100.16230 16.39 14 -38.59435 4.89 1.516798 64.20 15 -53.95439 0.20 16 -236.64161 4.89 1.755198 27.53 17 70.36245 18.81 18 -266.05833 2.00 1.698944 30.05 19 75.25389 33.27 1.638542 55.45 20 -84.97013 0.20 21 171.74823 29.36 1.696999 48.51 22 -138.59026 40.38 23 INFINITY 71.00 1.516798 64.20 PLATE 24 INFINITY ＜可変間隔＞ f=86.50 f=138.40 a 3.00 44.62 b 46.62 5.00 f1/fw = 2.5052 f2/fw = -1.0610 f3/fw = 1.1915 L23w/fw = 0.5615 △/f3 = 0.056 ｆ３１／ｆ３２ ＝ −１４．２<Numerical Example 10> f = 86.50 ~ 138.40 F = 3.5 ω = 49.4 ° 〜32.1 ° M = 32.3〜20.6 m ri di ni νi 1 134.01760 22.00 1.696999 48.51 2 -782.81481 2.00 3 -522.12329 7.00 1.581436 40.89 4 -197.14382 4.00 1.755198 27.53 5 -1732.74331 a 6 136.44705 2.00 1.700301 47.84 7 37.79143 17.60 8 358.72478 3.00 1.487489 70.44 9 35.30977 12.00 1.749497 35.27 10 110.8 1996 b 11 INFINITY 1.96 AST 12 58.54179 8.81 1.516798 64.20 13 -100.16230 16.39 14 -38.59435 4.89 1.516798 64.20 15 -53.95439 0.20 16 -236.64161 4.89 1.755198 27.53 17 70.36245 18.81 18 -266.05833 2.00 1.698944 30.05 19 75.25389 33.27 1.638542 55.45 20 -84.970 13 0.20 21 171.74823 29.36 1.696999 48.51 22 -138.59026 40.38 23 INFINITY 71.00 1.516798 64.20 PLATE 24 INFINITY <Variable interval> f = 86.50 f = 138.40 a 3.00 44.62 b 46.62 5.00 f1 / fw = 2.5052 f2 / fw = -1.0610 f3 / fw = 1.1915 L23w / fw = 0.5615 Δ / f3 = 0.056 f31 / f32 = −14.2
【００４３】＜数値実施例１１＞ ｆ＝８６．４９〜138.34 F=3.5 ω=49.5°〜32.1° M=32.3〜20.5 m ri di ni νi 1 124.38880 41.10 1.658435 50.85 2 -144.83943 3.00 1.749497 35.27 3 6372.42127 a 4 138.95214 2.87 1.700301 47.84 5 36.53094 15.95 6 223.22345 2.20 1.487489 70.44 7 32.98654 6.57 1.749497 35.27 8 96.17392 b 9 INFINITY 1.96 AST 10 56.45022 8.81 1.516798 64.20 11 -108.68959 16.45 12 -34.70872 4.89 1.516798 64.20 13 -43.98318 0.10 14 -244.33464 4.89 1.755198 27.53 15 68.00656 16.58 16 -307.30774 2.20 1.698944 30.05 17 68.83636 33.27 1.638542 55.45 18 -86.25807 0.10 19 166.87500 29.36 1.696999 48.51 20 -131.84891 34.18 21 INFINITY 71.00 1.516798 64.20 PLATE 22 INFINITY ＜可変間隔＞ f=86.49 f=138.34 a 2.95 42.64 b 46.75 4.92 f1/fw = 2.4820 f2/fw = -1.0352 f3/fw = 1.1452 L23w/fw = 0.5632 △/f3 = 0.058 f31/f32 = -22.9<Numerical Example 11> f = 86.49 to 138.34 F = 3.5 ω = 49.5 ° 〜32.1 ° M = 32.3〜20.5 m ri di ni νi 1 124.38880 41.10 1.658435 50.85 2 -144.83943 3.00 1.749497 35.27 3 6372.42 127 a 4 138.95214 2.87 1.700301 47.84 5 36.53094 15.95 6 223.22345 2.20 1.487489 70.44 7 32.98654 6.57 1.749497 35.27 8 96.17392 b 9 INFINITY 1.96 AST 10 56.45022 8.81 1.516798 64.20 11 -108.68959 16.45 12 -34.70872 4.89 1.516798 64.20 13 -43.98318 0.10 14 -244.33464 4.89 1.755198 27.53 15 68.00656 16.58 16 -307.30774 2.20 1.698944 30.05 17 68.83636 33.27 1.638542 55.45 18 -86.25807 0.10 19 166.87500 29.36 1.696999 48.51 20 -131.84891 34.18 21 INFINITY 71.00 1.516798 64.20 PLATE 22 INFINITY <Variable interval> f = 86.49 f = 138.34 a 2.95 42.64 b 46.75 4.92 f1 / fw = 2.4820 f2 / fw = -1.0352 f3 / fw = 1.1452 L23w / fw = 0.5632 △ / f3 = 0.058 f31 / f32 = -22.9
【００４４】図５〜図１５は、それぞれ数値実施例１〜
数値実施例１１に対応する小さな共役側でみた収差曲線
図である。球面収差図は(WL1=610nm,WL2=546.1nm,WL3=4
70nm)の３波長について示し、非点収差，歪曲収差は54
6.1nm（ｅ線）について示している。図５〜図１５にお
ける各収差は十分実用に供されるものである。FIGS. 5 to 15 are numerical examples 1 to 1, respectively.
FIG. 16 is an aberration curve diagram viewed from the small conjugate side, which corresponds to Numerical Example 11. The spherical aberration diagram is (WL1 = 610nm, WL2 = 546.1nm, WL3 = 4
70 nm) for 3 wavelengths, and astigmatism and distortion are 54
It shows about 6.1 nm (e line). The aberrations in FIGS. 5 to 15 are sufficiently practical.
【００４５】また、絞りＡＳＴは固定的に開口径を決め
る構成以外に、従来カメラレンズ等において公知のよう
な開口径が可変の構成とし、実効Ｆ値を変化させるよう
にしてもよい。絞りの開口径を変化させることにより液
晶プロジェクタの投写画像の輝度を制御可能である。ま
た液晶として公知の高分子分散型液晶（ＰＤＬＣ），動
的散度モード液晶（ＤＳＭーＬＣ）等を用いれば投写画
像の輝度，コントラストが調節可能となる。Further, the aperture AST may have a configuration in which the aperture diameter is variable as is well known in conventional camera lenses, etc., and the effective F value may be changed, in addition to the configuration in which the aperture diameter is fixedly determined. The brightness of the projected image of the liquid crystal projector can be controlled by changing the aperture diameter of the diaphragm. Further, if a well-known polymer dispersion type liquid crystal (PDLC), a dynamic dispersion mode liquid crystal (DSM-LC) or the like is used as the liquid crystal, the brightness and contrast of the projected image can be adjusted.
【００４６】＜請求項８〜１０＞本発明による液晶プロ
ジェクタの構成例は従来例で説明した図１６と同等であ
り、投写レンズ８として上記テレセントリックズームレ
ンズが搭載されている。３枚のモノクロ液晶パネル６
Ｒ，６Ｇ，６Ｂに形成された３原色画像は４分割構成の
ダイクロイックプリズム７で合成されて、投写レンズ８
によりフルカラーの投写光９がスクリーン（図示省略）
上に投写される。投写レンズ８は液晶パネル側がテレセ
ントリックな構成なので、投写画像の画面内の色むらが
小さい。また投写レンズ８は短焦点距離が得られるので
短投写距離で大画面が実現でき、かつ高解像力で歪曲収
差，色収差の小さい良好な表示特性が得られる。<Claims 8 to 10> A configuration example of the liquid crystal projector according to the present invention is equivalent to that of FIG. 16 described in the conventional example, and the telecentric zoom lens is mounted as the projection lens 8. 3 monochrome LCD panels 6
The three primary color images formed on R, 6G, and 6B are combined by the dichroic prism 7 having a four-division structure, and the projection lens 8
Causes full-color projection light 9 to pass through a screen (not shown)
Projected on. Since the liquid crystal panel side of the projection lens 8 is a telecentric configuration, the color unevenness in the screen of the projected image is small. Further, since the projection lens 8 has a short focal length, a large screen can be realized with a short projection distance, and good display characteristics with high resolution and small distortion and chromatic aberration can be obtained.
【００４７】さらに投写レンズ８の絞りの開口径を可変
とすれば、投写画像の輝度を制御できる。特に液晶とし
て公知の高分子分散型液晶（ＰＤＬＣ），動的散度モー
ド液晶（ＤＳＭーＬＣ）を用いれば投写画像の輝度，コ
ントラストの双方が調節可能となる。Further, if the aperture diameter of the diaphragm of the projection lens 8 is variable, the brightness of the projected image can be controlled. In particular, if a known polymer dispersed liquid crystal (PDLC) or dynamic dispersive mode liquid crystal (DSM-LC) is used as the liquid crystal, both the brightness and contrast of the projected image can be adjusted.
【００４８】[0048]
【発明の効果】以上に詳述したように、請求項１から請
求項７によれば、大きな共役側から順に、正の屈折力の
第１レンズ群Ｇ1、負の屈折力の第２レンズ群Ｇ2、正の
屈折力の第３レンズ群Ｇ3の３群から構成され、第１レ
ンズ群と第３レンズ群との距離を一定に保ったまま第２
レンズ群が第１レンズ群から第３レンズ群の方へ光軸上
を移動することによって焦点距離が短焦点から長焦点へ
と変化し、第３レンズ群の大きな共役側の焦点近傍に絞
り手段を配置し、全系の移動によって合焦するズームレ
ンズの屈折力配置を特定することにより、ダイクロイッ
クプリズムの挿入に十分なバックフォーカル長を有し、
液晶パネル側がテレセントリックで、短焦点端の焦点距
離が短く、高解像，低歪曲で色収差の小さな良好な性能
を有し、かつ鏡筒構造の簡単なテレセントリックズーム
レンズが得られる。As described above in detail, according to the first to seventh aspects, the first lens group G1 having a positive refractive power and the second lens group having a negative refractive power are arranged in this order from the large conjugate side. G2 and the third lens group G3 having a positive refractive power, the third lens group G3, and the second lens group while keeping the distance between the first lens group and the third lens group constant.
As the lens group moves from the first lens group to the third lens group on the optical axis, the focal length changes from the short focal point to the long focal point, and the diaphragm means is located near the large conjugate side focal point of the third lens group. , And by specifying the refractive power arrangement of the zoom lens that is focused by the movement of the entire system, by having a back focal length sufficient for the insertion of the dichroic prism,
The liquid crystal panel side is telecentric, the focal length at the short focal end is short, high resolution, low distortion, good chromatic aberration and good performance, and a telecentric zoom lens having a simple lens barrel structure can be obtained.
【００４９】また、請求項８から請求項１０によれば、
投写レンズとして請求項１から請求項７のテレセントリ
ックズームレンズを搭載した液晶投写型表示装置が得ら
れるので、投写画像の画面内の色むらが小さく、短投写
距離で大画面が得られ、かつ高解像で歪曲収差，色収差
の小さい良好な表示特性をもった投写型表示装置が実現
できる。また、投射画像の輝度、コントラストの調節機
能を有する投射型表示装置が実現可能となる。According to claims 8 to 10,
Since a liquid crystal projection display device equipped with the telecentric zoom lens according to any one of claims 1 to 7 as a projection lens can be obtained, color unevenness in the screen of a projected image is small, a large screen can be obtained at a short projection distance, and a high projection can be obtained. It is possible to realize a projection display device having good display characteristics with little distortion and chromatic aberration in resolution. Further, it becomes possible to realize a projection type display device having a function of adjusting the brightness and contrast of the projected image.
【図１】本発明の実施例１によるテレセントリックズー
ムレンズの断面図である。FIG. 1 is a sectional view of a telecentric zoom lens according to a first embodiment of the present invention.
【図２】本発明の実施例５によるテレセントリックズー
ムレンズの断面図である。FIG. 2 is a sectional view of a telecentric zoom lens according to Example 5 of the present invention.
【図３】本発明の実施例６によるテレセントリックズー
ムレンズの断面図である。FIG. 3 is a sectional view of a telecentric zoom lens according to Example 6 of the present invention.
【図４】本発明の実施例９によるテレセントリックズー
ムレンズの断面図である。FIG. 4 is a sectional view of a telecentric zoom lens according to Example 9 of the present invention.
【図５】本発明の実施例１におけるテレセントリックズ
ームレンズの諸収差図である。FIG. 5 is a diagram showing various aberrations of the telecentric zoom lens according to the first example of the present invention.
【図６】本発明の実施例２におけるテレセントリックズ
ームレンズの諸収差図である。FIG. 6 is a diagram of various types of aberration of the telecentric zoom lens according to the second example of the present invention.
【図７】本発明の実施例３におけるテレセントリックズ
ームレンズの諸収差図である。FIG. 7 is a diagram of various types of aberration of the telecentric zoom lens according to the third example of the present invention.
【図８】本発明の実施例４におけるテレセントリックズ
ームレンズの諸収差図である。FIG. 8 is a diagram of various types of aberration of the telecentric zoom lens in the fourth example of the present invention.
【図９】本発明の実施例５におけるテレセントリックズ
ームレンズの諸収差図である。FIG. 9 is a diagram of various types of aberration of the telecentric zoom lens according to the fifth example of the present invention.
【図１０】本発明の実施例６におけるテレセントリック
ズームレンズの諸収差図である。FIG. 10 is a diagram of various types of aberration of the telecentric zoom lens in the sixth example of the present invention.
【図１１】本発明の実施例７におけるテレセントリック
ズームレンズの諸収差図である。FIG. 11 is a diagram of various types of aberration of the telecentric zoom lens in the seventh example of the present invention.
【図１２】本発明の実施例８におけるテレセントリック
ズームレンズの諸収差図である。FIG. 12 is a diagram of various types of aberration of the telecentric zoom lens in Example 8 of the present invention.
【図１３】本発明の実施例９におけるテレセントリック
ズームレンズの諸収差図である。FIG. 13 is a diagram of various types of aberration of the telecentric zoom lens in the ninth example of the present invention.
【図１４】本発明の実施例１０におけるテレセントリッ
クズームレンズの諸収差図である。FIG. 14 is a diagram of various types of aberration of the telecentric zoom lens in the tenth embodiment of the present invention.
【図１５】本発明の実施例１１におけるテレセントリッ
クズームレンズの諸収差図である。FIG. 15 is a diagram showing various aberrations of the telecentric zoom lens according to Example 11 of the present invention.
【図１６】従来の液晶プロジェクタ、および第２の発明
による液晶プロジェクタを示す構成図である。FIG. 16 is a configuration diagram showing a conventional liquid crystal projector and a liquid crystal projector according to a second invention.
Ｇ１ 第１レンズ群 Ｇ２ 第２レンズ群 Ｇ３ 第３レンズ群 ＡＳＴ 絞り Ｐ 平行平板 １ 光源 ２Ｇ，２Ｒ 色分解手段 ７ 色合成手段（ダイクロイックプリズム） ８ 投写レンズ ６Ｒ，６Ｇ，６Ｂ 画像表示デバイス（液晶パネル） G1 first lens group G2 Second lens group G3 Third lens group AST aperture P parallel plate 1 light source 2G, 2R color separation means 7-color composition means (dichroic prism) 8 Projection lens 6R, 6G, 6B image display device (liquid crystal panel)
フロントページの続き (56)参考文献 特開 平３−15014（ＪＰ，Ａ) 特開 平２−56515（ＪＰ，Ａ) 特開 平５−241071（ＪＰ，Ａ) 特開 昭54−80143（ＪＰ，Ａ) 特開 昭55−90928（ＪＰ，Ａ) 特開 昭62−198813（ＪＰ，Ａ) 特開 昭63−148228（ＪＰ，Ａ) 特開 昭63−304218（ＪＰ，Ａ) 特開 昭56−25710（ＪＰ，Ａ) 特開 昭51−3251（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 15/16 Continuation of the front page (56) Reference JP-A-3-15014 (JP, A) JP-A-2-56515 (JP, A) JP-A-5-241071 (JP, A) JP-A-54-80143 (JP , A) JP 55-90928 (JP, A) JP 62-198813 (JP, A) JP 63-148228 (JP, A) JP 63-304218 (JP, A) JP 56-25710 (JP, A) JP-A-51-3251 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) G02B 15/16
Claims (10)
１レンズ群Ｇ1 、負の屈折力の第２レンズ群Ｇ2 、正の
屈折力の第３レンズ群Ｇ3 の３群から構成され、第１レ
ンズ群と第３レンズ群との距離を一定に保ったまま第２
レンズ群が第１レンズ群から第３レンズ群の方へ光軸上
を移動することによって焦点距離が短焦点から長焦点へ
と変化し、第３レンズ群の大きな共役側の焦点近傍に絞
り手段を配置し、全系の移動によって合焦するレンズで
あって、 １．６＜ｆ1／ｆｗ＜２．８ −１．４＜ｆ2／ｆｗ＜−０．６ ０．９＜ｆ3／ｆｗ＜１．５ ０．４＜Ｌ23ｗ／ｆｗ＜０．８ を満足することを特徴とするテレセントリックズームレ
ンズ。 但し、 ｆ1 ：第１レンズ群の焦点距離 ｆ2 ：第２レンズ群の焦点距離 ｆ3 ：第３レンズ群の焦点距離 ｆｗ ：短焦点端での全系の焦点距離 Ｌ23ｗ：短焦点端での第２レンズ群と第３レンズ群との
間隔1. A first lens group G1 having a positive refracting power, a second lens group G2 having a negative refracting power, and a third lens group G3 having a positive refracting power, in order from the large conjugate side, The second lens unit while keeping the distance between the first lens unit and the third lens unit constant
As the lens group moves from the first lens group to the third lens group on the optical axis, the focal length changes from the short focal point to the long focal point, and the diaphragm means is located near the large conjugate side focal point of the third lens group. Is a lens that is focused by the movement of the entire system, where 1.6 <f1 / fw <2.8-1.4 <f2 / fw <-0.6 0.9 <f3 / fw <1. Telecentric zoom lens characterized by satisfying 0.4 <L23w / fw <0.8. However, f1: focal length of the first lens group f2: focal length of the second lens group f3: focal length of the third lens group fw: focal length of the entire system at the short focal end L23w: second at the short focal end Distance between lens group and third lens group
近軸焦点位置から前記絞り手段に至る距離を△とすると
き、 ｜△／ｆ3｜＜０．１５ を満足することを特徴とする請求項１記載のテレセント
リックズームレンズ。2. When the distance from the paraxial focal position on the large conjugate side of the third lens group to the diaphragm means is Δ, | Δ / f3 | <0.15 is satisfied. The telecentric zoom lens according to claim 1.
含み、前記大きな共役側から順にＧ31，Ｇ32の２群より
構成され、レンズ群Ｇ31は前記小さな共役側の端に接合
レンズの接合面を含み、 −３０＜ｆ31／ｆ32＜−４ を満足することを特徴とする請求項１記載のテレセント
リックズームレンズ。 但し、 ｆ31：レンズ群Ｇ31の空気換算焦点距離 ｆ32：レンズ群Ｇ32の焦点距離3. The third lens group includes one cemented lens and is composed of two groups, G31 and G32, in order from the large conjugate side, and the lens group G31 has a cemented lens cemented to an end on the small conjugate side. The telecentric zoom lens according to claim 1, wherein the telecentric zoom lens includes a surface and satisfies -30 <f31 / f32 <-4. However, f31: focal length of the lens group G31 in terms of air f32: focal length of the lens group G32.
含み、該接合レンズは大きな共役側（Ｇ31群側）を両面
凹レンズで構成し、小さな共役側（Ｇ32群側）を両面凸
レンズで構成し、両レンズを接合して構成することを特
徴とする請求項１記載のテレセントリックズームレン
ズ。4. The third lens group includes one cemented lens, wherein the cemented lens has a large conjugate side (G31 group side) with a double-sided concave lens and a small conjugate side (G32 group side) with a double-sided convex lens. The telecentric zoom lens according to claim 1, wherein the telecentric zoom lens is constructed by cementing both lenses.
含み、前記大きな共役側から順にＧ31，Ｇ32の２群より
構成され、レンズ群Ｇ31は前記小さな共役側の端に接合
レンズの接合面を含み、該接合面は大きな共役側に凸で
あり、 ｎF＞ｎB を満足することを特徴とする請求項１記載のテレセント
リックズームレンズ。 但し、ｎF：接合面の直前（大きな共役側）の屈折率 ｎB：接合面の直後（小さな共役側）の屈折率5. The third lens group includes one cemented lens and is composed of two groups, G31 and G32, in order from the large conjugate side, and the lens group G31 has a cemented lens cemented to an end on the small conjugate side. The telecentric zoom lens according to claim 1, wherein the telecentric zoom lens includes a surface, the cemented surface is convex toward the large conjugate side, and satisfies nF> nB. However, nF: refractive index immediately before the bonding surface (large conjugate side) nB: immediately after the bonding surface (small conjugate side)
像面との間に平行平板を挿入した状態で収差補正したこ
とを特徴とする請求項１記載のテレセントリックズーム
レンズ。6. The telecentric zoom lens according to claim 1, wherein aberration correction is performed with a parallel plate inserted between the third lens group and the image plane on the small conjugate side.
たことを特徴とする請求項１記載のテレセントリックズ
ームレンズ。7. The telecentric zoom lens according to claim 1, wherein the aperture diameter of the diaphragm means is variable.
原色光に色分解する色分解手段と、前記３原色光で照明
される３個の画像表示デバイスと、該画像表示デバイス
に表示される３原色画像を合成する色合成手段と、色合
成された光束を拡大投写する投写レンズとを備え、投写
レンズとして請求項第１項記載のテレセントリックズー
ムレンズを用いたことを特徴とする投写型表示装置。8. The light source and the light emitted from the light source are red, green and blue.
Color separation means for performing color separation into primary color light, three image display devices illuminated with the three primary color lights, color combining means for combining the three primary color images displayed on the image display device, and color combination A projection display device comprising: a projection lens for magnifying and projecting a light flux, wherein the telecentric zoom lens according to claim 1 is used as the projection lens.
の直前に、３原色の合成を行なう４分割構成のダイクロ
イックプリズムを備えたことを特徴とする請求項８記載
の投写型表示装置。9. The projection display device according to claim 8, wherein the color combining means includes a dichroic prism having a four-division structure for combining the three primary colors immediately before the projection lens.
たことを特徴とする請求項８記載の投写型表示装置。10. The projection display device according to claim 8, wherein the aperture diameter of the diaphragm means is variable.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00884694A JP3382696B2 (en) | 1994-01-28 | 1994-01-28 | Telecentric zoom lens and projection display device |
| US08/837,507 US5982538A (en) | 1994-01-28 | 1997-04-03 | Stereoscopic image projection apparatus and telecentric zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00884694A JP3382696B2 (en) | 1994-01-28 | 1994-01-28 | Telecentric zoom lens and projection display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07218837A JPH07218837A (en) | 1995-08-18 |
| JP3382696B2 true JP3382696B2 (en) | 2003-03-04 |
Family
ID=11704121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00884694A Expired - Fee Related JP3382696B2 (en) | 1994-01-28 | 1994-01-28 | Telecentric zoom lens and projection display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3382696B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10161027A (en) * | 1996-11-27 | 1998-06-19 | Minolta Co Ltd | Variable power optical system |
| JP5345890B2 (en) * | 2009-04-28 | 2013-11-20 | 富士フイルム株式会社 | Projection zoom lens and projection display device |
-
1994
- 1994-01-28 JP JP00884694A patent/JP3382696B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07218837A (en) | 1995-08-18 |
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