JP2762638B2 - Projection lens - Google Patents
Projection lensInfo
- Publication number
- JP2762638B2 JP2762638B2 JP31804689A JP31804689A JP2762638B2 JP 2762638 B2 JP2762638 B2 JP 2762638B2 JP 31804689 A JP31804689 A JP 31804689A JP 31804689 A JP31804689 A JP 31804689A JP 2762638 B2 JP2762638 B2 JP 2762638B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- group
- screen
- screen side
- lenses
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Lenses (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明はテレビジョン受像機の画面等を拡大投影する
投写表示装置に使用するに適した色消し投影レンズに関
するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an achromatic projection lens suitable for use in a projection display device for enlarging and projecting a screen or the like of a television receiver.
従来の技術 一般に３管式のカラープロジェクターでは、Ｂ
（青）,G（緑）,R（赤）の３色の単色陰極線管の各々の
画像を投影レンズによりスクリーン上に投影し合成する
ため、単色光に対する諸収差を良好に補正していれば、
特に色消しの考慮は必要なかった。2. Description of the Related Art Generally, in a three-tube type color projector, B
Since the images of the three color monochromatic cathode ray tubes (blue), G (green), and R (red) are projected onto the screen by the projection lens and synthesized, if various aberrations for monochromatic light are well corrected ,
No special consideration was needed for achromatism.
発明が解決しようとする課題 しかしながら、単色陰極線管と言っても、それに用い
られる蛍光体の特性により、ある波長幅を有しており、
高精細度の像の投影においては、無視できなくなる。し
たがって、単色光に対して良好な結像性能を示し、高コ
ントラストで、且つ色収差補正がされていることが必要
となってくる。Problems to be Solved by the Invention However, even if it refers to a monochromatic cathode ray tube, due to the characteristics of the phosphor used in it, it has a certain wavelength width,
In the projection of a high-definition image, it cannot be ignored. Therefore, it is necessary to exhibit good imaging performance for monochromatic light, to have high contrast, and to correct chromatic aberration.
課題を解決するための手段 上記課題を解決するために本発明の投影レンズは、ス
クリーン側より順に曲率大なる面をスクリーン側に向け
た正の屈折力を有するレンズよりなる第１群レンズ、そ
の後方に両凸の正レンズとスクリーン側に凹面を向けた
負レンズの２枚のレンズよりなる第２群レンズ、その後
方に両凸のガラスレンズと少なくとも１面の非球面を含
むプラスチックレンズよりなる第３群レンズ、その後方
に凹面をスクリーン側に向けた負レンズより成る第４群
レンズから構成され、前記の各数値諸元を満足すること
により単色光に対して良好な結像性能を示し、高コント
ラストで、且つ色収差補正がされた投影レンズを実現し
ている。Means for Solving the Problems In order to solve the above problems, a projection lens according to the present invention comprises a first lens unit including a lens having a positive refractive power with a surface having a large curvature directed toward the screen in order from the screen side, and thereafter. The second group lens is composed of a biconvex positive lens and a negative lens having a concave surface facing the screen side, and a plastic lens including a biconvex glass lens and at least one aspheric surface is provided behind the second lens group. The third group lens is composed of a fourth lens group consisting of a negative lens having a concave surface facing the screen behind the third lens group. By satisfying the above-mentioned numerical specifications, a good image-forming performance for monochromatic light is exhibited. A projection lens with high contrast and chromatic aberration correction is realized.
作用 本発明の投影レンズにおいて、第１群レンズでは主と
して球面収差、コマ収差、第２群レンズで、球面収差と
軸上色収差の補正を行い、第３群レンズによりコマ収
差，非点収差を補正し、第４群レンズでは、画角によく
依存する収差、とくに像面湾曲、歪曲収差の補正を行っ
ている。ここで、特に、第２群レンズと第３群レンズの
間隔を適度に保ち、第２群レンズは軸外主光線高の低い
所に配置し、第３群レンズはある程度、軸外主光線高の
高い所に配置するパワー配置をとることにより、第２群
レンズでは、主として軸上に関する収差を、第３群レン
ズは、特にサジタル方向のコマ収差の補正、倍率の色収
差補正と、それぞれのレンズ群が、充分な収差補正効果
を発揮できるようにしている。In the projection lens of the present invention, the first group lens mainly corrects spherical aberration and coma, the second group lens corrects spherical aberration and axial chromatic aberration, and the third group lens corrects coma and astigmatism. The fourth lens group corrects aberrations that often depend on the angle of view, in particular, curvature of field and distortion. Here, in particular, the distance between the second group lens and the third group lens is appropriately maintained, the second group lens is arranged at a position where the off-axis principal ray height is low, and the third group lens is placed to some extent on the off-axis principal ray height. In the second group lens, aberrations mainly on the axis are provided, and the third group lens particularly corrects coma aberration in the sagittal direction, corrects chromatic aberration of magnification, and adjusts the respective lenses. The group is designed to exhibit a sufficient aberration correction effect.
実施例 以下本発明の一実施例の投影レンズについて、図面を
参照しながら説明する。第１図は本発明に係る投影レン
ズの実施例に基づく概略構成図、第２図（ａ），
（ｂ），（ｃ）は、実施例に基づく球面収差、非点収
差、歪曲収差の特性図である。歪曲収差は回路系の電気
的補正量を低減するために補正過剰としている。Embodiment Hereinafter, a projection lens according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic structural view based on an embodiment of a projection lens according to the present invention, and FIGS.
(B), (c) is a characteristic diagram of spherical aberration, astigmatism, and distortion based on the example. The distortion is overcorrected in order to reduce the amount of electrical correction of the circuit system.
第２図の特性図から明らかなように本発明によれば、
諸収差が良好に補正されていることがわかる。As is clear from the characteristic diagram of FIG. 2, according to the present invention,
It can be seen that various aberrations are satisfactorily corrected.
発明の効果 本発明は、スクリーン側より順に曲率大なる面をスク
リーン側に向けた正の屈折力を有するレンズよりなる第
１群レンズ、その後方に両凸の正レンズとスクリーン側
に凹面を向けた負レンズの２枚のレンズよりなる第２群
レンズ、その後方に両凸のガラスレンズと少なくとも１
面の非球面を含むプラスチックレンズよりなる第３群レ
ンズ、その後方に凹面をスクリーン側に向けた負レンズ
より成る第４群レンズから構成され、前記の各数値諸元
を満足することにより単色光に対して良好な結像性能を
示し、高コントラストで、且つ色収差補正がなされた投
影レンズを提供するものである。 Advantageous Effects of the Invention The present invention provides a first group lens composed of a lens having a positive refractive power in which a surface having a larger curvature is directed toward the screen in order from the screen side, and a biconvex positive lens and a concave surface facing the screen side. A second group lens composed of two negative lenses, and a biconvex glass lens and at least one
A third group lens composed of a plastic lens including an aspheric surface, and a fourth group lens composed of a negative lens having a concave surface facing the screen behind the third lens group. An object of the present invention is to provide a projection lens exhibiting good image formation performance, high contrast, and chromatic aberration correction.
第１図は本発明の第１の実施例における投影レンズの概
略構成図、第２図（ａ），（ｂ），（ｃ）は実施例に基
づく球面収差、非点収差、歪曲収差の特性図である。 第２図（ａ）において実線はｅ線、一点鎖線はｇ線に対
する収差、（ｂ）において実線はサジタル（Ｓ）方向の
収差、破線はメリディオナル（Ｍ）方向の収差である。FIG. 1 is a schematic structural view of a projection lens according to a first embodiment of the present invention, and FIGS. 2 (a), (b) and (c) show characteristics of spherical aberration, astigmatism and distortion based on the embodiment. FIG. In FIG. 2 (a), the solid line is the aberration with respect to the e-line, the one-dot chain line is the aberration with respect to the g-line, the solid line is the aberration in the sagittal (S) direction, and the broken line is the aberration in the meridional (M) direction.
Claims (1)
れ、スクリーン側より順に曲率大なる面をスクリーン側
に向けた正の屈折力を有するレンズよりなる第１群レン
ズ、その後方に両凸の正レンズとスクリーン側に凹面を
向けた負レンズの２枚のレンズよりなる第２群レンズ、
その後方に両凸のガラスレンズと少なくとも１面の非球
面を含むプラスチックレンズよりなる第３群レンズ、そ
の後方に凹面をスクリーン側に向けた負レンズより成る
第４群レンズから構成され、r1，r2……をスクリーンか
ら順に見た各面の曲率半径、d1，d2……を上記各面の面
間隔、n1，n2……をそれぞれのレンズのｅ線における屈
折率、ν1，ν2……をそれぞれのレンズのｅ線に対する
アッベ数、＊1,＊２……で印された面は非球面でありＸ
をレンズの光軸からの開口の半径距離Ｙの位置における
レンズ頂点からの変位量としたとき、 で示され、AD,AE,AF,AGは非球面係数、Ｋは円錐定数と
して以下の数値諸元を満足することを特徴とする投影レ
ンズ。 1. A first group lens comprising a lens having a positive refractive power and having a surface having a larger curvature directed toward a screen in order from a screen side, and a biconvex lens rearward of the first lens group. A second lens group consisting of two lenses, a positive lens and a negative lens with the concave surface facing the screen side;
Third group lens made of plastic lenses comprising at least one aspheric surface glass lenses biconvex behind it, are configured concave to the rear from the fourth group lens composed of a negative lens toward the screen side, r 1 , R 2 ... Are viewed from the screen in order, the radius of curvature of each surface, d 1 , d 2 ... Are the surface intervals of each surface, n 1 , n 2 . [nu 1, Abbe number [nu 2 ...... on e-each lens, * 1, * 2 faces, marked by ...... are aspherical X
Is the amount of displacement from the lens vertex at the position of the radial distance Y of the aperture from the optical axis of the lens, Wherein AD, AE, AF, and AG are aspherical coefficients, and K is a conical constant, satisfying the following numerical specifications.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31804689A JP2762638B2 (en) | 1989-12-07 | 1989-12-07 | Projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31804689A JP2762638B2 (en) | 1989-12-07 | 1989-12-07 | Projection lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03179310A JPH03179310A (en) | 1991-08-05 |
| JP2762638B2 true JP2762638B2 (en) | 1998-06-04 |
Family
ID=18094891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31804689A Expired - Fee Related JP2762638B2 (en) | 1989-12-07 | 1989-12-07 | Projection lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2762638B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100234193B1 (en) * | 1992-11-27 | 1999-12-15 | 윤종용 | Projection optical system |
| JP3416690B2 (en) * | 1995-05-10 | 2003-06-16 | キヤノン株式会社 | Small zoom lens |
-
1989
- 1989-12-07 JP JP31804689A patent/JP2762638B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03179310A (en) | 1991-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10890742B2 (en) | Projection optical system and projection type display device | |
| JP3588283B2 (en) | Projection lens and projector using it | |
| US7184219B2 (en) | Projection lens system and projector | |
| JP2002031754A (en) | Lens device for projection and projection type picture display device | |
| US4603950A (en) | Projection lens | |
| JP2018036390A (en) | Wide angle lens, projection type display device, and imaging device | |
| JP6570477B2 (en) | Imaging optical system, projection display device, and imaging device | |
| JPH06347695A (en) | Projection lens | |
| JP4451516B2 (en) | Projection zoom lens | |
| JP3610166B2 (en) | Large aperture wide angle telecentric lens | |
| JP4240342B2 (en) | Retro focus lens | |
| JP4689147B2 (en) | Projection zoom lens and enlargement projection device | |
| JP2000019393A (en) | Single focus lens | |
| JPH0682689A (en) | Retrofocus type lens | |
| JPH0750245B2 (en) | Projection lens | |
| JP2762638B2 (en) | Projection lens | |
| JP2002131636A (en) | Projecting lens | |
| JPH04335610A (en) | Projection lens | |
| JP2813744B2 (en) | Projection lens | |
| JP2563417B2 (en) | Projection lens | |
| JP2576058B2 (en) | Projection lens | |
| JPH0638132B2 (en) | Projection lens | |
| JP2800293B2 (en) | Projection lens | |
| JP2798770B2 (en) | Projection lens | |
| JPH0446404B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |