JPH03179310A - Projection lens - Google Patents

Abstract

PURPOSE:To obtain the projection lens excellent in image forming performance to homogeneous light and also has high contrast and compensated chromatic aberrations by composing the projection lens of four lenses and satisfying respective numerical elements. CONSTITUTION:A 1st group lens consisting of a lens which has a large-curvature surface on a screen side and also has positive refracting power and a 2nd group lens consisting of two lenses, i.e. a biconvex positive lens and a negative lens with a concave surface on the screen side behind the 1st group lens are provided in order from the screen side. Then a 3rd group lens consisting of a biconvex glass lens and a plastic lens having at least one aspherical surface and a 4th group lens consisting of a negative lens having a concave surface on the screen side are provided behind said lens in order. Various elements are satisfied so that equations I indicate some of radii r1 - r14 of curvature and surface intervals d1 - d13. Here, (n) is a refractive index, (v) is an Abbe number, and *1 and *2 show aspherical surfaces. Consequently, the projection lens which has the excellent image forming performance to homogeneous light, high contrast, and compensated chromatic aberrations is obtained.

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間す
るものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an achromatic projection lens suitable for use in a projection display device for enlarging and projecting the screen of a television receiver or the like.

従来の技術 一般に３管式のカラープロジェクタ−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台底するため
、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。Conventional technology Generally, in a three-tube color projector, B (blue),
Since the images of each of the three monochromatic cathode ray tubes, G (green) and R (red), are projected onto the screen using a projection lens, if various aberrations for monochromatic light are well corrected, the color There was no need to consider erasing it.

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 monochromatic cathode ray tubes have a certain wavelength width due to the characteristics of the phosphor used therein, which cannot be ignored when projecting high-definition images. Therefore, it is necessary to exhibit good imaging performance for monochromatic light, have high contrast, and correct chromatic aberration.

課題を解決するための手段 上記！ＩＮ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事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、前記の各数値緒言を満足することに
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。Above are the means to solve the problem! In order to solve the problem of IN, the projection lens of the present invention includes a first lens group consisting of a lens having a positive refractive power with its curved surface facing the screen side in order from the screen side, and a biconvex positive lens behind it. and a negative lens with a concave surface facing the screen, a second group lens consisting of two lenses, and a third group lens consisting of a biconvex glass lens and a plastic lens including at least one aspherical surface, behind it. It is composed of a fourth lens group consisting of a negative lens with a concave surface facing the screen side, and by satisfying the numerical requirements mentioned above, it exhibits good imaging performance for monochromatic light, has high contrast, and corrects chromatic aberration. This has resulted in a projection lens that is

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、両角によく依存
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。Operation 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 aberration,
Astigmatism is corrected, and the fourth group lens corrects aberrations that are highly dependent on both angles, particularly curvature of field and distortion. Here, in particular, keep the distance between the second group lens and the third group lens moderate, the second group lens is placed at a place where the off-axis chief ray height is low, and the third group lens is placed at a place where the off-axis chief ray height is low to some extent. By adopting a power arrangement that is placed at a high location, the second group lens mainly corrects axial aberrations, and the third group lens corrects coma aberration in the sagittal direction, corrects chromatic aberration of magnification, and corrects each lens. This allows the group to exhibit sufficient aberration correction effects.

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。EXAMPLE Hereinafter, a projection lens according to an example of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram based on an embodiment of the projection lens according to the present invention, and FIGS. 2(a) and (b)
, (C) is a characteristic diagram of spherical aberration, astigmatism, and distortion aberration based on the example. Distortion aberration is overcorrected to reduce the amount of electrical correction in 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 in FIG. 2, according to the present invention, various aberrations are well corrected.

〔具体的な実施例〕[Specific examples]

ｒ　、　−１６６，６１９ｄ　、　＝１２．００　　　
　＊　１ｎ　、　＝１．４９３８３４　　　　　ν、　
＝５６．９ｒ　、　＝２７４．７４１　　　　　ｄ　、
　＝３５．８２　　　　＊　２ｎｚ＝１．０ ｒ　３　＝　１７７．４１５　　　　　ｄ　ｓ　＝２８
．ＯＯｎ　ｘ　＝１．５９１４２　　　　９３−６１．
０ｒ　４＝−１７７，４１５ｄ　、　＝０．５０ｎ４＝
１．０ ｒ　ｓ　−−２３１，４４７ｄ　ｓ　＝４．０Ｏｎｓ　
−１，７３４３２ν、　＝２８．１ｒｂ　　＝２３１．
４４７ ｎｉ＝１．。r, -166,619d, =12.00
*1n, =1.493834 ν,
=56.9r, =274.741d,
= 35.82 * 2nz = 1.0 r 3 = 177.415 d s = 28
．． OOn x =1.59142 93-61.
0r4=-177,415d, =0.50n4=
1.0 r s −-231,447 d s =4.0 Ons
-1,73432ν, =28.1rb =231.
447 ni=1. .

ｒ、＝９６．５３８ ｎ？　　＝１．５９１４２ ｒ　ｓ　　−−３６３，３１８ ｎｇ＝１．。r,=96.538 n? =1.59142 r　s　　--363,318 ng=1. .

ｒ、＝−７０６，５３６ ｎ　、　　＝１．４９３８３４ ｒ　１、＝−６７２，０２１ ｎｌ。−１，０ ｒ　Ｉ　１−−５０．６３０ ｎ　１、＝１．４９３８３４ ｒ　１、＝−６０，０００ ｎ　ｌ！＝１．４３００００ ｒ　１３８ω ｄ。r,=-706,536 n, =1.493834 r　1,=-672,021 nl. -1,0 r　I　1--50.630 n 1, = 1.493834 r　1,=-60,000 nl! =1.430000 r　138ω d.

＝１６．５１ ７ ＝２８．ＯＯ シ、＝６１．０ ５ −１５．３２ ｄ。=16.51 7 =28. OO C = 61.0 5 -15.32 d.

−８，４４ シ、＝５６．９ 。−５９，３４ ｄ＋＋＝５．００ ＝５６．９ ｇ＝７．ｏ。-8,44 C,=56.9 . -59,34 d++=5.00 =56.9 g=7. o.

ｄ＋ｚ＝１０゜３０ ｎ＋＋＝１．５３８ ｊ　、４＝（Ｘ） ＊　　Ｉ　　　Ｋ＝１．０３３７８ Ａ　Ｄ　＝−２，４２６８７Ｘ１０−’Ａ　Ｆ　＝８．
２８６４３　　Ｘｌ０−”Ａ　Ｅ　＝−７，６８８１０
Ｘ１０ Ａ　Ｃ＝１．２１３６４　　ｘ１０ ＊２　　　Ｋ＝１１．９７８５ Ａ　Ｄ　−４，９７２１６ｘｌＯ−’　　Ａ　Ｅ　＝−
７，５６５９６ｘｌＯＡＦ＝１．２４４９８　　Ｘｌ０
−”　　ＡＧ＝−６，７４９０１Ｘ１０−”＊３　　　
Ｋ＝０．０ ＡＤ＝３．５６０６６　　Ｘｌ０−’　　ＡＥ＝８゜９
８３９４　　Ｘｌ０Ａ　Ｆ　＝−３，２４１１１Ｘ１０
−”　　ＡＧ＝−４，６０８５０ＸＩＯ＊４　　　Ｋ＝
０．０ ＡＤ＝７．０８６９３　　Ｘｌ０−’　　ＡＥ＝６．１
０８１３　　Ｘｌ０ＡＦ＝１．９２１０１　　Ｘｌ０−
”　　ＡＧ＝−２，１７４８９Ｘ１０−”＊　５　　　
Ｋ　＝−７，７５９７７Ｘ１０−”ＡＤ＝４．６６３６
１　　ｘｌｏ−７ＡＥ＝−３，３５１１３ｘｌＯ−１０
Ａ　Ｆ　＝１．８０６８０　　ｘｌＯ−”　　ＡＧ＝−
１，１５６５５ｘｌＯ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
り威る第４群レンズから構成され、前記の各数値緒言を
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
ンズを提供するものである。d+z=10°30 n++=1.538 j , 4=(X) * I K=1.03378 A D =-2,42687X10-'A F =8.
28643 Xl0-”A E =-7,68810
X10 A C=1.21364 x10 *2 K=11.9785 A D -4,97216xlO-' A E =-
7,56596xlOAF=1.24498Xl0
-”AG=-6,74901X10-”*3
K=0.0 AD=3.56066 Xl0-' AE=8°9
8394 Xl0A F = -3,24111X10
-”AG=-4,60850XIO*4 K=
0.0 AD=7.08693 Xl0-' AE=6.1
0813 Xl0AF=1.92101 Xl0-
"AG=-2,17489X10-"*5
K=-7,75977X10-"AD=4.6636
1xlo-7AE=-3,35113xlO-10
A F =1.80680 xlO-” AG=-
1,15,655
A second group lens consisting of two lenses, a biconvex positive lens behind it and a negative lens with a concave surface facing the screen, and a biconvex glass lens behind it and at least one aspherical surface. It consists of a 3rd group lens made of a plastic lens, and a 4th group lens behind that which is more powerful than a negative lens with a concave surface facing the screen side, and by satisfying each numerical introduction mentioned above, it can produce good results for monochromatic light. The object of the present invention is to provide a projection lens that exhibits good image performance, has high contrast, and is corrected for chromatic aberration.

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

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ｇ線、−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。Figure 1 is a schematic configuration diagram of a projection lens according to the first embodiment of the present invention, and Figures 2 (a), (b), and (C) are characteristics of spherical aberration, astigmatism, and distortion aberration based on the embodiment. It is a diagram. In FIG. 2(a), the solid line is the aberration for the g-line, the dashed-dotted line is the aberration for the g-line, and in FIG. 2(b), 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)

【特許請求の範囲】 テレビジョン画像の投写表示装置に用いられ、スクリー
ン側より順に曲率大なる画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画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、ｒ＿１、ｒ＿２・・・・・・をスクリー
ンから順に見た各面の曲率半径、ｄ＿１、ｄ＿２・・・
・・・を上記各面の面間隔、ｎ＿１、ｎ＿２・・・・・
・をそれぞれのレンズのｅ線における屈折率、ν＿１、
ν＿２・・・・・・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、 ▲数式、化学式、表等があります▼ 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緒言を満足することを特徴と
する投影レンズ。 ｒ＿１＝１６６．６１９　ｄ＿１＝１２．００　＊１ｎ
＿１＝１．４９３８３４　ν＿１＝５６．９ｒ＿２＝２
７４．７４１　ｄ＿２＝３５．８２　＊２ｎ＿２＝１．
０ ｒ＿３＝１７７．４１５　ｄ＿３＝２８．００ｎ＿３＝
１．５９１４２　ν＿３＝６１．０ｒ＿４＝−１７７．
４１５　ｄ＿４＝０．５０ｎ＿４＝１．０ ｒ＿５＝−２３１．４４７　ｄ＿５＝４．００ｎ＿５＝
１．７３４３２　ν＿５＝２８．１ｒ＿６＝２３１．４
４７　ｄ＿６＝１６．５１ｎ＿６＝１．０ ｒ＿７＝９６．５３８　ｄ＿７＝２８．００ｎ＿７＝１
．５９１４２　ν＿７＝６１．０ｒ＿８＝−３６３．３
１８　ｄ＿８＝１５．３２ｎ＿８＝１．０ ｒ＿９＝−７０６．５３６　ｄ＿９＝８．４４　＊３ｎ
＿９＝１．４９３８３４　ν＿９＝５６．９ｒ＿１＿０
＝−６７２．０２１　ｄ＿１＿０＝５９．３４　＊４ｎ
＿１＿０＝１．０ ｒ＿１＿１＝−５０．６３０　ｄ＿１＿１＝５．００　
＊５ｎ＿１＿１＝１．４９３８３４　ν＿１＿１＝５６
．９ｒ＿１＿２＝−６０．０００　ｄ＿１＿２＝７．０
０ｎ＿１＿２＝１．４３００００ ｒ＿１＿３＝∞　ｄ＿１＿３＝１０．３０ ｎ＿１＿３＝１．５３８ ｒ＿１＿４＝∞ ＊１　Ｋ＝１．０３３７８ ＡＤ＝−２．４２６８７×１０＾−＾７　ＡＥ＝−７．
６８８１０×１０＾−＾１＾１ＡＦ＝８．２８６４３×
１０＾−＾１＾５　ＡＧ＝１．２１３６４×１０＾−＾
２＾０＊２　Ｋ＝１１．９７８５ ＡＤ＝−１．９７２１６×１０＾−＾７　ＡＥ＝−７．
５６５９６×１０＾−＾１＾１ＡＦ＝１．２４４９８×
１０＾−＾１＾４　ＡＧ＝−６．７４９０１×１０＾−
＾１＾０＊３　Ｋ＝０．０ ＡＤ＝３．５６０６６×１０＾−＾７　ＡＥ＝８．９８
３９４×１０＾−＾１＾１ＡＦ＝−３．２４１１１×１
０＾−＾１＾４　ＡＧ＝−４．６０８５０×１０＾−＾
１＾８＊４　Ｋ＝０．０ ＡＤ＝７．０８６９３×１０＾−＾７　ＡＥ＝６．１０
８１３×１０＾−＾１＾１ＡＦ＝１．９２１０１×１０
＾−＾１＾４　ＡＧ＝−２．１７４８９×１０＾−＾１
＾８＊５　Ｋ＝−７．７５９７７×１０＾−＾２ＡＤ＝
４．６６３６１×１０＾−＾７　ＡＥ＝−３．３５１１
３×１０＾−＾１＾０ＡＦ＝１．８０６８０×１０＾−
＾１＾３　ＡＧ＝−１．１５６５５×１０＾−＾１＾７[Claims] Used in a television image projection display device, the first group lens is composed of a lens having a positive refractive power that directs the image with increasing curvature toward the screen side in order from the screen side, and a biconvex lens at the rear thereof. A second group lens consisting of two lenses, a positive lens and a negative lens with a concave surface facing the screen, and a third group lens consisting of a biconvex glass lens and a plastic lens including at least one aspherical surface behind it. , consists of a fourth lens group consisting of a negative lens with a concave surface facing the screen side behind it, and r_1, r_2...... are the radii of curvature of each surface when viewed from the screen in order, d_1, d_2...
... is the spacing of each of the above surfaces, n_1, n_2...
・ is the refractive index of each lens at the e-line, ν_1,
ν_2... is the Abbe number of each lens for the e-line, the surfaces marked *1, *2... are aspheric surfaces, and X is the radius of the aperture from the optical axis of the lens. When the amount of displacement from the lens vertex at the position of distance Y is expressed as ▲There are mathematical formulas, chemical formulas, tables, etc.▼, AD, AE, AF, AG are aspherical coefficients, K is a conic constant, and the numerical introduction is as follows. A projection lens that satisfies the following. r_1=166.619 d_1=12.00 *1n
_1=1.493834 ν_1=56.9r_2=2
74.741 d_2=35.82 *2n_2=1.
0 r_3=177.415 d_3=28.00n_3=
1.59142 ν_3=61.0r_4=-177.
415 d_4=0.50n_4=1.0 r_5=-231.447 d_5=4.00n_5=
1.73432 ν_5=28.1r_6=231.4
47 d_6=16.51n_6=1.0 r_7=96.538 d_7=28.00n_7=1
．． 59142 ν_7=61.0r_8=-363.3
18 d_8=15.32n_8=1.0 r_9=-706.536 d_9=8.44 *3n
_9=1.493834 ν_9=56.9r_1_0
=-672.021 d_1_0=59.34 *4n
_1_0=1.0 r_1_1=-50.630 d_1_1=5.00
*5n_1_1=1.493834 ν_1_1=56
．． 9r_1_2=-60.000 d_1_2=7.0
0n_1_2=1.430000 r_1_3=∞ d_1_3=10.30 n_1_3=1.538 r_1_4=∞ *1 K=1.03378 AD=-2.42687×10^-^7 AE=-7.
68810×10^-^1^1AF=8.28643×
10^-^1^5 AG=1.21364×10^-^
2^0*2 K=11.9785 AD=-1.97216×10^-^7 AE=-7.
56596×10^-^1^1AF=1.24498×
10^-^1^4 AG=-6.74901×10^-
^1^0*3 K=0.0 AD=3.56066×10^-^7 AE=8.98
394×10^-^1^1AF=-3.24111×1
0^-^1^4 AG=-4.60850×10^-^
1^8*4 K=0.0 AD=7.08693×10^-^7 AE=6.10
813×10^-^1^1AF=1.92101×10
^-^1^4 AG=-2.17489×10^-^1
^8*5 K=-7.75977×10^-^2AD=
4.66361×10^-^7 AE=-3.3511
3×10^-^1^0AF=1.80680×10^-
^1^3 AG=-1.15655×10^-^1^7