JPH06130293A - Projection optical system - Google Patents
Projection optical systemInfo
- Publication number
- JPH06130293A JPH06130293A JP4276063A JP27606392A JPH06130293A JP H06130293 A JPH06130293 A JP H06130293A JP 4276063 A JP4276063 A JP 4276063A JP 27606392 A JP27606392 A JP 27606392A JP H06130293 A JPH06130293 A JP H06130293A
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- lens
- projection
- optical system
- projection optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 37
- 230000004907 flux Effects 0.000 claims abstract description 10
- 238000005286 illumination Methods 0.000 claims description 17
- 239000004973 liquid crystal related substance Substances 0.000 description 15
- 230000004075 alteration Effects 0.000 description 11
- 238000000926 separation method Methods 0.000 description 10
- 230000014509 gene expression Effects 0.000 description 9
- 230000010287 polarization Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Landscapes
- Projection Apparatus (AREA)
- Lenses (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は投影光学系に関し、例え
ばカラー液晶に表示された投影像原画をスクリーン面上
に拡大投影する際のレンズ系全体の小型化を図った高い
光学性能を有する投影光学系に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection optical system, for example, a projection system having a high optical performance for downsizing an entire lens system when enlarging and projecting a projection image original image displayed on a color liquid crystal on a screen surface. It relates to an optical system.
【０００２】[0002]
【従来の技術】従来よりフィルム画像や液晶ライトバル
ブ等の投影像原画をスクリーン面上に拡大投影するよう
にした投影光学系が種々と提案されている。2. Description of the Related Art Conventionally, various projection optical systems have been proposed in which a film image, a projection image original image of a liquid crystal light valve or the like is enlarged and projected on a screen surface.
【０００３】投影光学系には種々なタイプのものが用い
られているが投影像原画としてカラー液晶を用いた投影
光学系には、最終レンズ面から液晶表示素子までの空間
（バックフォーカス）に反射ミラーやダイクロイックミ
ラー等の光学部材を配置する為に長いバックフォーカス
を有したものが要望されている。この為、カラー液晶用
の投影光学系には負の屈折力のレンズ群が先行するレト
ロフォーカスタイプのものが多く用いられている。Although various types of projection optical systems are used, a projection optical system using a color liquid crystal as an original image of a projected image is reflected in a space (back focus) from a final lens surface to a liquid crystal display element. What has a long back focus for arranging optical members such as a mirror and a dichroic mirror is desired. For this reason, a projection optical system for a color liquid crystal is often used as a retrofocus type in which a lens unit having a negative refractive power precedes.
【０００４】図６は特開昭６１−１３８８５号公報で提
案されている投影光学系の要部概略図である。同図にお
いて２０は光源、１９はレンズ、２１は楕円反射鏡であ
り、光源２０からの光束をレンズ１９側に反射してい
る。１２は広帯域偏光ビームスプリッターであり、例え
ばＳ偏光成分のみを反射させている。FIG. 6 is a schematic view of a main part of a projection optical system proposed in Japanese Patent Laid-Open No. 61-13885. In the figure, 20 is a light source, 19 is a lens, and 21 is an elliptical reflecting mirror, which reflects the light flux from the light source 20 toward the lens 19 side. Reference numeral 12 is a broadband polarization beam splitter, which reflects only the S-polarized component, for example.
【０００５】１３は青反射ダイクロイック面を有する色
分解プリズム、１４は赤反射ダイクロイック面を有する
色分解プリズムである。１５は光路長補正用の光学ブロ
ックである。１６，１７，１８は各々液晶装置である。Reference numeral 13 is a color separation prism having a blue reflection dichroic surface, and 14 is a color separation prism having a red reflection dichroic surface. Reference numeral 15 is an optical block for optical path length correction. Reference numerals 16, 17, and 18 denote liquid crystal devices, respectively.
【０００６】同図では光源２０からの光束をレンズ１９
を介して偏光ビームスプリッター１２でＳ偏光成分のみ
を反射させている。そして色分解プリズム１３，１４で
青色光、赤色光、緑色光の３色光に色分解して各々液晶
装置１６，１７，１８を照明している。液晶装置からは
投影像原画に基づいて偏光面が回転した反射光が得られ
る。これにより液晶装置（１６，１７，１８）の投影像
原画を色分解プリズム、偏光ビームスプリッター１２を
介して合成し、投影レンズ１１によりスクリーン面上に
拡大投影している。In FIG. 1, the light flux from the light source 20 is reflected by the lens 19
Only the S-polarized component is reflected by the polarization beam splitter 12 via. Then, the color separation prisms 13 and 14 perform color separation into three color lights of blue light, red light and green light, and illuminate the liquid crystal devices 16, 17 and 18, respectively. From the liquid crystal device, reflected light whose polarization plane is rotated can be obtained based on the original image of the projected image. As a result, the original images of the projected images of the liquid crystal device (16, 17, 18) are combined via the color separation prism and the polarization beam splitter 12, and enlarged and projected on the screen surface by the projection lens 11.
【０００７】[0007]
【発明が解決しようとしている課題】図７に示す投影光
学系では投影レンズ１１と液晶装置（１６，１７，１
８）との間に偏光ビームスプリッター１２と色分解プリ
ズム１３，１４とを配置している。この為投影レンズ１
１には例えば液晶装置（１６，１７，１８）の幅の３倍
以上の長いバックフォーカスが必要となってくる。In the projection optical system shown in FIG. 7, the projection lens 11 and the liquid crystal device (16, 17, 1) are used.
The polarization beam splitter 12 and the color separation prisms 13 and 14 are arranged between the above and 8). Therefore, the projection lens 1
1 requires a long back focus which is, for example, three times or more the width of the liquid crystal device (16, 17, 18).
【０００８】一般に長いバックフォーカスを有するには
レンズ系全体をスクリーン側に負の屈折力のレンズ群
を、投影像原画側に正の屈折力のレンズ群を配置した、
所謂レトロ型にする必要がある。Generally, in order to have a long back focus, the entire lens system has a lens group having a negative refractive power on the screen side and a lens group having a positive refractive power on the original image side of the projected image.
It is necessary to make it a so-called retro type.
【０００９】しかしながらレトロ型にするとレンズ系が
非対称となってくる為に諸収差の発生が多くなり、良好
なる光学性能を得るのが難しくなってくる。又レンズ枚
数が増加し、レンズ系全体が複雑化及び大型化してくる
という問題点が生じてくる。However, when the retro type is used, the lens system becomes asymmetrical, so that various aberrations occur more frequently, and it becomes difficult to obtain good optical performance. In addition, the number of lenses increases, and the entire lens system becomes complicated and large in size.
【００１０】本発明は投影レンズのレンズ構成及び液晶
パネル等の投影像原画を照明する照明手段の構成を適切
に設定することにより、あまり長いバックフォーカスを
必要とせず、かつ装置全体の大型化を防止した投影光学
系の提供を目的とする。According to the present invention, by appropriately setting the lens structure of the projection lens and the structure of the illuminating means for illuminating the original image of the projected image such as the liquid crystal panel, a too long back focus is not required and the size of the entire apparatus is increased. The purpose is to provide a projection optical system which is prevented.
【００１１】[0011]
【課題を解決するための手段】本発明の投影光学系の特
徴とするところは、投影像原画をスクリーン面上に投影
する投影光学系において、該投影光学系は該スクリーン
側より順に負の屈折力の第１レンズ群、正の屈折力の第
２レンズ群、該スクリーン側へ凸の平凸レンズ１枚より
なる正の屈折力の第３レンズ群の３つのレンズ群を有す
る投写レンズ、そして該第２群と第３群との間に照明光
導入手段とを有し、該照明光導入手段は光路外に配置し
た光源部からの光束を該第３レンズ群側へ反射させ、該
第３レンズ群を介した光束で該投影像原画を照明し、該
投影像原画からの反射光を用いて該投影像原画を該スク
リーン面に投影することにある。そして望ましくは該第
ｉ群の焦点距離をＦｉ、全系の焦点距離をＦ、第ｉ群と
第ｉ＋１群の主点間隔をｅ i、としたとき −２＜Ｆ1／Ｆ＜−０．５（１） １＜Ｆ2／Ｆ＜２．５（２） １＜Ｆ3／Ｆ＜３（３） ０．５＜ｅ1／Ｆ＜３（４） １．５＜ｅ2／Ｆ＜５（５） なる条件式を満足することにある。The features of the projection optical system of the present invention are as follows.
The point is to project the original projected image on the screen surface.
In the projection optical system, the projection optical system is the screen.
The first lens group having negative refractive power and the first lens group having positive refractive power in order from the side
2 lens groups, 1 plano-convex lens convex to the screen side
Has three lens groups of the third lens group of positive refractive power
Projection lens, and illumination light between the second and third groups
And an illuminating light introducing means arranged outside the optical path.
The light flux from the light source unit is reflected to the third lens group side,
The projection image original image is illuminated with the light flux passing through the third lens group,
The reflected light from the projected image original is used to scan the projected image original.
It is to project on the lean surface. And preferably the first
The focal length of the i group is Fi, the focal length of the entire system is F, and the i-th group is
The principal point interval of the i + 1-th group is e i, When -2 <F1/F<-0.5(1) 1 <F2/F<2.5(2) 1 <F3/ F <3 (3) 0.5 <e1/ F <3 (4) 1.5 <e2/ F <5 (5) is satisfied.
【００１２】[0012]
【実施例】図１、図２は各々本発明の実施例１，２の光
学系の要部概略図である。図１において１１は投影レン
ズであり、負の屈折力の第１レンズ群Ｌ１と、正の屈折
力の第２レンズ群Ｌ２そしてスクリーン側へ凸の平凸レ
ンズ１枚よりなる正の屈折力の第３レンズ群Ｌ３の３つ
のレンズ群を有している。同図ではこのうち第１レンズ
群を光軸に沿って移動させてフォーカス（ピント調整）
を行っている。ＳＰは絞りである。1 and 2 are schematic views of the essential parts of an optical system according to Examples 1 and 2 of the present invention. In FIG. 1, reference numeral 11 denotes a projection lens, which has a first lens unit L1 having a negative refracting power, a second lens unit L2 having a positive refracting power, and a plano-convex lens having a positive refracting power which is convex toward the screen side. It has three lens groups of three lens groups L3. In the same figure, of these, the first lens group is moved along the optical axis for focusing (focus adjustment).
It is carried out. SP is a diaphragm.
【００１３】９は光源部であり、白色光束を放射してお
り、投影レンズ１１の光路外に配置している。４は照明
光導入手段であり、ハーフミラー面より成っており第２
レンズ群と第３レンズ群との間の絞りＳＰ近傍に配置し
ている。照明光導入手段４は、例えば光源部９からの光
束を第３レンズ群方向に反射させ、後述する投影像原画
（６，７，８）を照明している。Ｓはスクリーン面であ
る。A light source unit 9 emits a white light beam and is arranged outside the optical path of the projection lens 11. Reference numeral 4 is an illumination light introducing means, which is composed of a half mirror surface
It is arranged near the diaphragm SP between the lens group and the third lens group. The illumination light introducing unit 4 reflects, for example, the light flux from the light source unit 9 toward the third lens group, and illuminates the projection image original image (6, 7, 8) described later. S is a screen surface.
【００１４】５は色分解手段であり、内部にダイクロイ
ック面を有し、入射光束を例えば青色光、緑色光、赤色
光の３つの色光に分解して射出している。６，７，８は
各々投影像原画としての反射型の液晶パネル（液晶装
置）である。Numeral 5 is a color separation means which has a dichroic surface inside and decomposes the incident light beam into three color lights of, for example, blue light, green light and red light, and emits the light. Reference numerals 6, 7 and 8 denote reflective liquid crystal panels (liquid crystal devices) as original images of projected images.
【００１５】本実施例では光源部９から放射した光束の
一部を照明光導入手段４により第３レンズ群方向に反射
させ、第３レンズ群を介した後、色分解手段５で所定の
３つの色光に分解して各々投影像原画（６，７，８）を
照明している。In this embodiment, a part of the luminous flux emitted from the light source section 9 is reflected by the illumination light introducing means 4 toward the third lens group, passes through the third lens group, and is then separated by the color separating means 5 into a predetermined number of three. The original image (6, 7, 8) of the projected image is illuminated by being separated into two color lights.
【００１６】このように投影像原画（６，７，８）を照
明する為の照明光導入手段４を第２レンズ群と第３レン
ズ群との間に配置することにより、投影レンズ１１に要
求されるバックフォーカスの短縮化を図っている。By arranging the illumination light introducing means 4 for illuminating the projection image original image (6, 7, 8) in this way between the second lens group and the third lens group, the projection lens 11 is required. The back focus is shortened.
【００１７】これより本実施例では投影像原画（６，
７，８）を色分解手段５を介して重ね合わせて投影レン
ズ１１によりスクリーン面Ｓ上に拡大投影している。そ
してこのとき第１レンズ群の全部のレンズ群を光軸上移
動させてフォーカス（ピント調整）を行っている。Therefore, in the present embodiment, the projection image original image (6,
7, 8) are superposed through the color separation means 5 and enlarged and projected on the screen surface S by the projection lens 11. At this time, all the lens groups of the first lens group are moved on the optical axis for focusing (focus adjustment).
【００１８】絞りＳＰを第２レンズ群と第３レンズ群と
の間の照明光導入手段４の近傍に配置し、投影レンズ１
１の歪曲収差の発生量を少なくしている。尚本実施例に
おいて絞りＳＰは第２レンズ群と第３レンズ群との間で
あればどの位置に配置してもよい。又照明光導入手段４
の有効径を絞りとして併用して構成してもよい。The stop SP is arranged in the vicinity of the illumination light introducing means 4 between the second lens group and the third lens group, and the projection lens 1
The amount of distortion aberration 1 is reduced. In this embodiment, the diaphragm SP may be arranged at any position between the second lens group and the third lens group. Further, the illumination light introducing means 4
The effective diameter may be used as a diaphragm in combination.
【００１９】この実施例では照明光導入手段としてハー
フミラーを使用したが微小な反射部と透過部を規則的に
又はランダムに設けたドットミラーを用いていることも
可能である。Although a half mirror is used as the illumination light introducing means in this embodiment, it is also possible to use a dot mirror in which minute reflecting portions and transmitting portions are regularly or randomly provided.
【００２０】図２〜３は本発明に係る投影レンズの数値
実施例１〜２のレンズ断面図である。図中１１は投影レ
ンズである。投影レンズ１１は負の屈折力の第１レンズ
群Ｌ１と正の屈折力の第２レンズ群Ｌ２、そして正の屈
折力の第３レンズ群Ｌ３の３つのレンズ群を有してい
る。４は照明光導入手段、５は色分解手段、ＳＰは絞
り、２２は色フィルターである。2 to 3 are lens sectional views of numerical examples 1 and 2 of the projection lens according to the present invention. Reference numeral 11 in the drawing is a projection lens. The projection lens 11 has three lens groups, a first lens group L1 having a negative refractive power, a second lens group L2 having a positive refractive power, and a third lens group L3 having a positive refractive power. Reference numeral 4 is an illumination light introducing unit, 5 is a color separating unit, SP is a diaphragm, and 22 is a color filter.
【００２１】図４〜５は本発明の投影レンズの数値実施
例１〜２の投影倍率４０倍のときの収差図である。FIGS. 4 to 5 are aberration diagrams of Numerical Examples 1 and 2 of the projection lens of the present invention when the projection magnification is 40 times.
【００２２】本実施例では各レンズ群の屈折力や主点間
隔等を前述の如く適切に設定し、これにより少ないレン
ズ枚数でレンズ系全体の小型化を図りつつ所定のバック
フォーカスを得て、投影画像の光学性能を良好に維持
し、かつ第１レンズ群でフォーカスをする際の収差変動
を良好に補正している。In the present embodiment, the refracting power of each lens group, the principal point spacing, etc. are appropriately set as described above, and thereby a predetermined back focus is obtained while reducing the size of the entire lens system with a small number of lenses. The optical performance of the projected image is kept good, and the aberration variation when focusing with the first lens group is well corrected.
【００２３】次に前述の条件式の技術的意味について説
明する。Next, the technical meaning of the above conditional expression will be described.
【００２４】条件式（１）は全系の焦点距離に対する負
の屈折力の第１群の焦点距離の比に関し、主にレンズ全
長の増大を防止しつつ第１群でフォーカスを行うときの
諸収差の変動を少なくする為のものである。Conditional expression (1) relates to the ratio of the focal length of the first lens unit having negative refracting power to the focal length of the entire system, and is mainly used when focusing is performed by the first lens unit while preventing the total lens length from increasing. This is for reducing the fluctuation of aberration.
【００２５】条件式（１）の下限値を越えて第１群の負
の屈折力が弱くなりすぎるとフォーカスの際の第１群の
移動量が多くなりすぎ、レンズ全長が長くなってくる。
又上限値を越えて負の屈折力が強くなりすぎるとフォー
カスの際の移動量は少なくなるが、画面全体の像面弯曲
が正の方向に増大してくるので良くない。If the lower limit of conditional expression (1) is exceeded and the negative refractive power of the first lens unit becomes too weak, the amount of movement of the first lens unit during focusing becomes too large, and the total lens length becomes long.
On the other hand, if the negative refracting power becomes too strong beyond the upper limit, the amount of movement during focusing becomes small, but the image plane curvature of the entire screen increases in the positive direction, which is not good.
【００２６】条件式（２）、（３）は各々全系の焦点距
離に対する第２群、第３群の焦点距離の比に関し、主に
投影像原画に入射する主光線が略平行となる。テレセン
トリック性を良好に保ち、投影像原画全体の色再現や諸
収差をバランス良く保ちつつスクリーン面上に投影する
為のものである。Conditional expressions (2) and (3) relate to the ratios of the focal lengths of the second lens unit and the third lens unit to the focal lengths of the entire system, and the chief rays mainly incident on the original image of the projected image are substantially parallel. This is for projecting on the screen surface while maintaining good telecentricity and maintaining well-balanced color reproduction and various aberrations of the entire projected image.
【００２７】条件式（２）、（３）を外れるといずれも
諸収差を良好に維持しつつテレセントリック性を維持す
るのが難しくなり、又投影像原画全体の光学性能をバラ
ンス良く保ちつつ投影するのが難しくなってくる。If conditional expressions (2) and (3) are not satisfied, it becomes difficult to maintain various aberrations while maintaining telecentricity, and projection is performed while maintaining good optical performance of the entire projection image original image. Becomes difficult.
【００２８】条件式（４）は全系の焦点距離に対する第
１群と第２群の主点間隔の比に関し、主に条件式（１）
〜（３）の基でレンズ系全体を所定のバックフォーカス
が容易に得られるレトロ型とする為のものである。Conditional expression (4) is mainly related to the ratio of the principal point spacing of the first and second lens groups to the focal length of the entire system.
Based on (3) to (3), the entire lens system is a retro type that can easily obtain a predetermined back focus.
【００２９】条件式（４）の下限値を越えて主点間隔が
短くなりすぎるとレトロ度が弱くなり、バックフォーカ
スが短くなると共に全系の焦点距離が長くなってくる。
又上限値を越えて主点間隔が長くなりすぎるとレトロ度
が強くなりすぎ、バックフォーカスが所定値以上に長く
なりレンズ全長が増大してくるので良くない。If the distance between the principal points becomes too short beyond the lower limit of conditional expression (4), the retro degree becomes weak, the back focus becomes short, and the focal length of the entire system becomes long.
On the other hand, if the principal point interval exceeds the upper limit and becomes too long, the retro degree becomes too strong, the back focus becomes longer than a predetermined value, and the total lens length increases, which is not preferable.
【００３０】条件式（５）は全系の焦点距離に対する第
２群と第３群の主点間隔の比に関し、主に諸収差をバラ
ンス良く保ち、かつ所定のバックフォーカスを得つつ、
第２群と第３群の間に所定の大きさの照明光導入手段を
配置する為の空間を適切に得る為のものである。Conditional expression (5) relates to the ratio of the principal point spacings of the second and third lens groups to the focal length of the entire system, and mainly keeps various aberrations in good balance and obtains a predetermined back focus.
This is for appropriately obtaining a space for arranging the illumination light introducing means having a predetermined size between the second group and the third group.
【００３１】条件式（５）の下限値を越えて主点間隔が
短くなりすぎると照明光導入手段を配置するのが難しく
なり、又上限値を越えて主点間隔が長くなりすぎるとレ
ンズ系全体が大きくなり、かつ諸収差をバランス良く補
正するのが難しくなってくる。If the principal point interval becomes too short beyond the lower limit of conditional expression (5), it becomes difficult to arrange the illumination light introducing means, and if the principal point interval exceeds the upper limit, the lens system becomes too long. The whole becomes large, and it becomes difficult to correct various aberrations in good balance.
【００３２】尚本実施例において、照明系から入射され
る光によって発生する第３レンズ群のゴーストを極力減
少させるためには、第３レンズ群をスクリーン側へ凸の
平凸レンズによって構成させるとともに該平凸レンズを
平凸レンズの屈折率と近い接着剤、あるいは液体によっ
てダイクロプリズムと接着あるいは密着させることが望
ましい。In the present embodiment, in order to reduce the ghost of the third lens group generated by the light incident from the illumination system as much as possible, the third lens group should be formed of a plano-convex lens convex to the screen side. It is desirable that the plano-convex lens is adhered or adhered to the dichroic prism with an adhesive or a liquid having a refractive index close to that of the plano-convex lens.
【００３３】次に本発明の数値実施例を示す。数値実施
例においてはｒｉはスクリーン側より順に第ｉ番目のレ
ンズ面の曲率半径、ｄｉはスクリーン側より第ｉ番目の
レンズ厚および空気間隔、ｎｉとνｉは各々物体側より
順に第ｉ番目のレンズのガラスの屈折率とアッベ数であ
る。Next, numerical examples of the present invention will be shown. In the numerical example, ri is the radius of curvature of the i-th lens surface in order from the screen side, di is the i-th lens thickness and air gap from the screen side, and ni and vi are the i-th lens in order from the object side, respectively. Is the refractive index and Abbe number of the glass.
【００３４】数値実施例１におけるｒ２１〜Ｒ２４、数
値実施例２におけるｒ１９〜ｒ２２は色分解手段や色フ
ィルター等のガラスブロックである。R21 to R24 in Numerical Embodiment 1 and r19 to r22 in Numerical Embodiment 2 are glass blocks such as color separation means and color filters.
【００３５】[0035]
【表１】 [Table 1]
【００３６】[0036]
【外１】 [Outer 1]
【００３７】[0037]
【外２】 [Outside 2]
【００３８】[0038]
【発明の効果】本発明によれば前述の如く、投影レンズ
のレンズ構成及び液晶パネル等の投影像原画を照明する
照明手段の構成を適切に設定することにより、所定のバ
ックフォーカスを有しかつ全体のレンズ枚数を少なくし
装置全体の大型化を防止しつつ、投影像原画をスクリー
ン面上に容易にピントの合った状態で拡大投影すること
ができる投影光学系を達成することができる。According to the present invention, as described above, by appropriately setting the lens configuration of the projection lens and the configuration of the illumination means for illuminating the original image of the projected image such as the liquid crystal panel, a predetermined back focus can be obtained. It is possible to achieve a projection optical system capable of easily enlarging and projecting a projection image original image on a screen surface while reducing the total number of lenses to prevent the apparatus from becoming large in size.
【００３９】特に第３レンズ群をスクリーン側へ凸の平
凸レンズ１枚で構成することにより照明系の入射光によ
って発生するゴーストを極めて少くすることができた。In particular, by constructing the third lens group with one plano-convex lens element convex to the screen side, the ghost generated by the incident light of the illumination system can be extremely reduced.
【図１】本発明の実施例１の光学系の要部概略部。FIG. 1 is a schematic view of a main part of an optical system according to a first embodiment of the present invention.
【図２】本発明の数値実施例１のレンズ断面図。FIG. 2 is a lens cross-sectional view of Numerical Example 1 of the present invention.
【図３】本発明の数値実施例２のレンズ断面図。FIG. 3 is a lens cross-sectional view of Numerical Example 2 of the present invention.
【図４】本発明の数値実施例１の投影倍率４０倍の諸収
差図。FIG. 4 is a diagram of various types of aberration at a projection magnification of 40 × according to Numerical Example 1 of the present invention.
【図５】本発明の数値実施例２の投影倍率４０倍の諸収
差図。FIG. 5 is a diagram of various types of aberration at a projection magnification of 40 according to Numerical Example 2 of the present invention.
【図６】従来の一般的な投影系の断面図。FIG. 6 is a sectional view of a conventional general projection system.
Ｉ１ 投影レンズ Ｌ１ 第１レンズ群 Ｌ２ 第２レンズ群 Ｌ３ 第３レンズ群 ４ 照明光導入手段 ５ 色分解手段 ６，７，８ 投影像原画 ９ 光源部 ＳＰ 絞り ｄ ｄ線 ｇ ｇ線 Ｍ メリディオナル像面 Ｓ サジタル像面 I1 Projection lens L1 First lens group L2 Second lens group L3 Third lens group 4 Illumination light introducing means 5 Color separation means 6,7,8 Projection image original image 9 Light source section SP diaphragm d d line g g line M meridional image plane S sagittal image plane
Claims (3)
投影光学系において、該投影光学系は該スクリーン側よ
り順に負の屈折力の第１レンズ群、正の屈折力の第２レ
ンズ群そして該スクリーン側へ凸の平凸レンズ１枚より
なる第３レンズ群と、前記第２レンズ群と第３レンズ群
との間に照明光導入手段とを有し、該照明光導入手段は
光路外に配置した光源部からの光束を該第３レンズ群側
へ反射させ、該第３レンズ群を介した光束で該投影像原
画を照明し、該投影像原画からの反射光を用いて該投影
像原画を該スクリーン面に投影することを特徴とする投
影光学系。1. A projection optical system for projecting an original image of a projected image on a screen surface, the projection optical system comprising, in order from the screen side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and A third lens group consisting of one plano-convex lens convex to the screen side and illumination light introducing means between the second lens group and the third lens group are provided, and the illumination light introducing means is provided outside the optical path. A light flux from the arranged light source unit is reflected toward the third lens group side, the projection image original image is illuminated with the light flux passing through the third lens group, and the projection image is reflected using the reflected light from the projection image original image. A projection optical system which projects an original image on the screen surface.
距離をＦ、第ｉ群と第ｉ＋１群の主点間隔をｅｉ、とし
たとき −２＜Ｆ1／Ｆ＜−０．５ １＜Ｆ2／Ｆ＜２．５ １＜Ｆ3／Ｆ＜３ ０．５＜ｅ1／Ｆ＜３ １．５＜ｅ2／Ｆ＜５ なる条件を満足することを特徴とする請求項１記載の投
影光学系。2. When the focal length of the i-th group is Fi, the focal length of the entire system is F, and the principal point interval between the i-th group and the (i + 1) -th group is ei, -2 <F 1 / F <-0 .5 1 <F 2 /F<2.5 1 <F 3 / F <3 0.5 <e 1 / F <3 1.5 <e 2 / F <5 The projection optical system according to claim 1.
シングを行うことを特徴とする請求項２記載の投影光学
系。3. The projection optical system according to claim 2, wherein focusing is performed by moving the first lens group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4276063A JP3049676B2 (en) | 1992-10-14 | 1992-10-14 | Projection optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4276063A JP3049676B2 (en) | 1992-10-14 | 1992-10-14 | Projection optical system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06130293A true JPH06130293A (en) | 1994-05-13 |
| JP3049676B2 JP3049676B2 (en) | 2000-06-05 |
Family
ID=17564286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4276063A Expired - Fee Related JP3049676B2 (en) | 1992-10-14 | 1992-10-14 | Projection optical system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3049676B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5795047A (en) * | 1994-12-09 | 1998-08-18 | Matsushita Electric Industrial Co., Ltd. | Projection lens and projection display apparatus |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2939444B1 (en) | 2008-12-10 | 2011-02-04 | Aes Chemunex | DEVICE FOR DISPENSING A PRODUCT IN A PETRI BOX. |
| CA3060377C (en) | 2017-04-20 | 2024-03-12 | Biomerieux, Inc. | Method, apparatus, and computer program product for controlling components of a detection device |
-
1992
- 1992-10-14 JP JP4276063A patent/JP3049676B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5795047A (en) * | 1994-12-09 | 1998-08-18 | Matsushita Electric Industrial Co., Ltd. | Projection lens and projection display apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3049676B2 (en) | 2000-06-05 |
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