JP2001091829A5

JP2001091829A5 -

Info

Publication number: JP2001091829A5
Application number: JP1999266110A
Authority: JP
Filing date: 1999-09-20
Publication date: 2006-11-02
Anticipated expiration: 2019-09-20

Description

【特許請求の範囲】
【請求項１】
平面画像を拡大して投射結像させる投射用ズームレンズであって、
拡大側から順に、第１ないし第５群を配してなり、第３群と第４群の間に絞りを有し、
第１群は負の屈折力、第２群、第３群、第４群、第５群は正の屈折力を、それぞれ有し、
投射距離が変化するとき、平面画像と投射像とを共役関係に保つため、第１群が光軸方向に移動を行い、
変倍に際しては、第１群及び第５群が固定で、第２群、第３群、及び第４群が光軸方向に移動を行うことを特徴とする投射用ズームレンズ。
【請求項２】
請求項１記載の投射用ズームレンズにおいて、
ｆ１：第１群の焦点距離、
ｆ２：第２群の焦点距離、
ｆｗ：広角端における全系の焦点距離、
ｆＴ：望遠端における全系の焦点距離、
ＤＨｗ：広角端における第２群の最も拡大側寄りの面から、第２群から第５群までの合成の拡大側主点位置までの距離、
ＤＨＴ：望遠端における第２群の最も拡大側寄りの面から、第２群から第５群までの合成の拡大側主点位置までの距離、
ｆｐｗ：広角端における第２群から第５群までの合成の焦点距離、
ｆｐＴ：望遠端における第２群から第５群までの合成の焦点距離、
（１）０．３＜｜ｆ１｜／ｆ２＜０．６
（２）０．５・ｆＴ／ｆｗ＜ＤＨｗ／ＤＨＴ＜１．１・ｆＴ／ｆｗ
（３）０．７・ｆＴ／ｆｗ＜ｆｐＴ／ｆｐｗ＜１．３・ｆＴ／ｆｗ
を満足することを特徴とする投射用ズームレンズ。
【請求項３】
請求項２記載の投射用ズームレンズにおいて、
第１群を構成する凹レンズの材質の、アッべ数の平均値：ν１が、条件：
（４）ν１＞５５
を満足することを特徴とする投射用ズームレンズ。
【請求項４】
請求項３記載の投射用ズームレンズにおいて、
第１群における少なくとも１つのレンズ面が非球面であることを特徴とする投射用ズームレンズ。
【請求項５】
請求項３または４記載の投射用ズームレンズにおいて、
第２群における少なくとも１つのレンズ面が非球面であることを特徴とする投射用ズームレンズ。 [Claims]
[Claim 1]
A projection zoom lens that magnifies a flat image and forms a projection image.
The first to fifth groups are arranged in order from the expansion side, and there is a diaphragm between the third group and the fourth group.
The first group has a negative refractive power, and the second group, the third group, the fourth group, and the fifth group have a positive refractive power, respectively.
When the projection distance changes, the first group moves in the optical axis direction in order to keep the planar image and the projected image in a conjugate relationship.
A projection zoom lens characterized in that the first group and the fifth group are fixed at the time of scaling, and the second group, the third group, and the fourth group move in the optical axis direction.
2.
In the projection zoom lens according to claim 1,
f1: Focal length of the first group,
f2: Focal length of the second group,
fw: Focal length of the whole system at the wide-angle end,
fT: Focal length of the whole system at the telephoto end,
DHw: The distance from the surface closest to the expansion side of the second group at the wide-angle end to the expansion side principal point position of the composition from the second group to the fifth group,
DHT: The distance from the surface closest to the expansion side of the second group at the telephoto end to the expansion side principal point position of the composition from the second group to the fifth group,
fpw: Focal length of the composition from the 2nd group to the 5th group at the wide-angle end,
fpT: Focal length of synthesis from group 2 to group 5 at the telephoto end,
(1) 0.3 << f1 | / f2 <0.6
(2) 0.5 · fT / fw <DHw / DHT <1.1 · fT / fw
(3) 0.7 · fT / fw <fpT / fpw <1.3 · fT / fw
A zoom lens for projection that is characterized by satisfying .
3.
In the projection zoom lens according to claim 2,
The average value of the number of abbreviations of the materials of the concave lenses constituting the first group: ν1, and the condition:
(4) ν1> 55
A zoom lens for projection that is characterized by satisfying.
4.
In the projection zoom lens according to claim 3,
A zoom lens for projection, characterized in that at least one lens surface in the first group is an aspherical surface.
5.
In the projection zoom lens according to claim 3 or 4.
A zoom lens for projection, characterized in that at least one lens surface in the second group is an aspherical surface .

【０００８】
【課題を解決するための手段】
この発明の投射用レンズは、平面画像を拡大して投射結像させる投射用ズームレンズである。この発明の投射用レンズは上述した３板式プロジェクタ用の投射用レンズとして特に好適であるが、３板式プロジェクタに限らず、単板式プロジェクタや、一般のプロジェクタ用の投射用レンズとしても好適に使用できる。
この発明の投射用ズームレンズは、図１に例示するように、拡大側（図の左方）から順に、第１群Ｇ１〜第５群Ｇ５を配してなり、第３群Ｇ３と第４群Ｇ４の間に絞りＳを有する。第１群Ｇ１は「負の屈折力」を持つ。第２群Ｇ２、第３群Ｇ３、第４群Ｇ４、第５群Ｇ５は、何れも「正の屈折力」を持つ。したがって、全体のパワー配置は「負・正・正・正・正」である。なお、符号ＰＲは、色合成手段としての色合成プリズムを示している。
投射距離が変化するとき、平面画像と投射像とを共役関係に保つため、第１群Ｇ１が光軸方向に移動を行う。また、変倍に際しては、第１群Ｇ１と第５群Ｇ５が固定され、第２群Ｇ２、第３群Ｇ３、第４群Ｇ４が光軸方向に移動する（請求項１）。
第１群Ｇ１の焦点距離を「ｆ１」、第２群Ｇ２の焦点距離を「ｆ２」、広角端における全系の焦点距離を「ｆｗ」、望遠端における全系の焦点距離を「ｆＴ」、広角端における第２群Ｇ２の最も拡大側寄りの面から、第２群Ｇ２から第５群Ｇ５までを合成した拡大側主点位置までの距離を「ＤＨｗ」、望遠端における第２群Ｇ２の最も拡大側寄りの面から、第２群Ｇ２から第５群Ｇ５までを合成した拡大側主点位置までの距離を「ＤＨＴ」、広角端における第２群Ｇ２から第５群Ｇ５までの合成の焦点距離を「ｆｐｗ」、望遠端における第２群Ｇ２から第５群Ｇ５までの合成の焦点距離を「ｆｐＴ」とするとき、これらは、条件：
（１）０．３＜｜ｆ１｜／ｆ２＜０．６
（２）０．５・ｆＴ／ｆｗ＜ＤＨｗ／ＤＨＴ＜１．１・ｆＴ／ｆｗ
（３）０．７・ｆＴ／ｆｗ＜ｆｐＴ／ｆｐｗ＜１．３・ｆＴ／ｆｗ
を満足することが好ましい（請求項２）。
さらにこの場合、第１群Ｇ１を構成する凹レンズの材質の、アッべ数の平均値「ν１」が、条件：
（４）ν１＞５５
を満足することが好ましい（請求項３）。
請求項３記載の投射用ズームレンズにおいて「第１群における少なくとも１つのレンズ面を非球面とする」ことができる（請求項４）。また、上記請求項３または請求項４記載の投射用ズームレンズにおいて「第２群における少なくとも１つのレンズ面を非球面とする」ことができる（請求項５）。 0008
[Means for solving problems]
The projection lens of the present invention is a projection zoom lens that magnifies a planar image and forms a projection image. The projection lens of the present invention is particularly suitable as a projection lens for the above-mentioned three-plate projector, but can be suitably used not only as a three-plate projector but also as a single-plate projector or a projection lens for a general projector. ..
As illustrated in FIG. 1, the projection zoom lens of the present invention comprises first group G1 to fifth group G5 arranged in order from the magnifying side (left side of the figure), and third group G3 and fourth group G3 and fourth group G5. It has an aperture S between groups G4. The first group G1 has a "negative refractive power". The second group G2, the third group G3, the fourth group G4, and the fifth group G5 all have "positive refractive power". Therefore, the overall power distribution is "negative / positive / positive / positive / positive". The reference numeral PR indicates a color synthesis prism as a color synthesis means.
When the projection distance changes, the first group G1 moves in the optical axis direction in order to keep the planar image and the projected image in a conjugate relationship. Further, at the time of scaling, the first group G1 and the fifth group G5 are fixed, and the second group G2, the third group G3, and the fourth group G4 move in the optical axis direction (claim 1) .
The focal length of the first group G1 is "f1", the focal length of the second group G2 is "f2", the focal length of the entire system at the wide-angle end is "fw", and the focal length of the entire system at the telephoto end is "fT". The distance from the surface closest to the expansion side of the second group G2 at the wide-angle end to the expansion side principal point position where the second group G2 to the fifth group G5 are combined is "DHw", and the distance of the second group G2 at the telephoto end. The distance from the surface closest to the expansion side to the focal length on the expansion side, which is the composite of the 2nd group G2 to the 5th group G5, is "DHT". When the focal length is "fpw" and the focal length of the composition from the second group G2 to the fifth group G5 at the telephoto end is "fpT" , these are the conditions:
(1) 0.3 << f1 | / f2 <0.6
(2) 0.5 · fT / fw <DHw / DHT <1.1 · fT / fw
(3) 0.7 · fT / fw <fpT / fpw <1.3 · fT / fw
(Claim 2).
Further, in this case, the average value "ν1" of the number of abbreviations of the materials of the concave lenses constituting the first group G1 is a condition:
(4) ν1> 55
(Claim 3) .
In the projection zoom lens according to claim 3 , "at least one lens surface in the first group is an aspherical surface" ( claim 4 ). Further, in the projection zoom lens according to claim 3 or 4 , "at least one lens surface in the second group is an aspherical surface" ( claim 5 ).

この発明の投射用ズームレンズは、上記の如く「負、正、正、正、正」の屈折力を持つ、第１群Ｇ１〜第５群Ｇ５の構成とし、負の屈折力を持つ第１群Ｇ１に対し、第２群Ｇ２〜第５群Ｇ５の合成屈折力を正とすることで、全体をレトロフォーカスタイプとし、３板式プロジェクタに必要な長いバックフォーカスを確保し、小さなＦＮｏ．と広画角を実現している。
また、絞りＳを第３群Ｇ３と第４群Ｇ４の間に設け、第３群Ｇ３あるいは第４群Ｇ４と一体に移動させることで、広角端から望遠端への変倍に伴い、絞りＳを液晶パネルなど「平面画像を表示する面（表示面）」から遠ざかるように変位させることができる。このようにすると、絞りＳが、焦点距離の増加にしたがい、表示面から遠ざかるので、全ての変倍範囲にわたり「縮小側において略テレセントリックな特性」を得ることができる。
条件（１）は、第１群Ｇ１、第２群Ｇ２において発生する球面収差を「良好に保つための条件」であり、上限を超えると球面収差がレンズ側に倒れ、下限を超えるとレンズと反対側に倒れ、他の群での補正が困難となる。
従来からプロジェクタ用ズームレンズには、長いバックフォーカスが確保しやすいということで「第１群が凹の屈折力、第２群が凸の屈折力を持った２群式ズームレンズ」がよく用いられてきた。このような２群式ズームレンズの場合、図２に示すように第１群Ｇ１と第２群Ｇ２の間隔を変化させることで変倍を行う。 The projection zoom lens of the present invention has a first group G1 to a fifth group G5 having a "negative, positive, positive, positive, positive" refractive power as described above, and has a negative refractive power. By making the combined refractive power of the second group G2 to the fifth group G5 positive with respect to the group G1, the whole is made a retrofocus type, the long back focus required for the three-plate type projector is secured, and a small FNo. A wide angle of view is achieved.
Further, by providing the aperture S between the third group G3 and the fourth group G4 and moving it integrally with the third group G3 or the fourth group G4, the aperture S is changed from the wide-angle end to the telephoto end. Can be displaced so as to move away from a "plane image display surface (display surface)" such as a liquid crystal panel. In this way, the aperture S moves away from the display surface as the focal length increases, so that "a substantially telecentric characteristic on the reduction side" can be obtained over the entire scaling range.
Condition (1) is a "condition for keeping good spherical aberration" generated in the first group G1 and the second group G2. When the upper limit is exceeded, the spherical aberration falls to the lens side, and when the lower limit is exceeded, the lens and the lens. It falls to the other side, making it difficult to correct in other groups.
Conventionally, as a zoom lens for a projector, " a two-group zoom lens having a concave refractive power in the first group and a convex refractive power in the second group " is often used because it is easy to secure a long back focus. I came. In the case of such a two-group zoom lens, the magnification is changed by changing the distance between the first group G1 and the second group G2 as shown in FIG.

この発明の投射用ズームレンズは、負の屈折力の第１群、正の屈折力の第２群、第３群、第４群、第５群の構成となっているため、前述のように、第１群とそれ以外の群とに大きく分けて「凹・凸のパワー配置」になっていると考えることができる。
２群式ズームレンズでは、第１群と第２群の群間隔の変化のみで全系の焦点距離を変化させるが、この発明の投射用ズームレンズでは、第１群と、第２群から第５群までの合成の拡大側（第１群側）主点位置までの距離を変化させると同時に、第２群から第５群までの合成の焦点距離も変化することで変倍がなされている。
したがって、２群式ズームレンズにおいて、群どうしの主点間隔のみで変倍を行う場合に比して、この発明の投射用ズームレンズでは、各群のパワーを小さくできるとともに、変倍時の「移動群の移動量」も比較的小さく抑えることが可能となり、諸収差の発生量も低く抑えることができる。
変倍比は、望遠端の焦点距離と広角端の焦点距離の比ｆＴ／ｆＷで与えられるが、条件式（２）、条件式（３）は、十分な性能を保ちつつ、液晶プロジェクタ用の投射用ズームレンズとして必要な変倍比を確保するための条件である。
条件式（２）において、条件の下限を超えると、必要な変倍比に比して、「第２群から第５群までの合成の拡大側主点位置」の変化が少なくなり、「第２群から第５群までの合成の焦点距離」の変化を大きくせざるを得ず、非点収差、コマ収差などの発生が大となり、結像性能の低下を招きやすい。
また、上限を超えると、必要な変倍比に比して、「第２群から第５群までの合成の拡大側主点位置」の変化が大きくなりすぎ、移動群の変動範囲を広く確保する必要上、レンズ全体が大型化してしまう。
条件式（３）において、条件の下限を超えると、必要な変倍比に比して、「第２群から第５群までの合成の焦点距離」の変化が少なく、条件式（２）の上限を超えた場合と同様、移動群の変倍範囲を広く確保しなければならなくなり、レンズ全体の大型化を招く。
条件式（３）の上限を超えると必要な変倍比に比して、「第２群から第５群までの合成の焦点距離」の変化が大きくなりすぎ、非点収差、コマ収差などの発生量が大となり、結像性能が低下しやすい。 Since the projection zoom lens of the present invention has a structure of a first group of negative refractive power, a second group of positive refractive power, a third group, a fourth group, and a fifth group, as described above. , It can be considered that the first group and the other groups are roughly divided into "concave / convex power arrangement".
In the two-group zoom lens, the focal length of the entire system is changed only by changing the group spacing of the first group and the second group, but in the projection zoom lens of the present invention, the first group and the second to second groups are changed. The magnification is changed by changing the distance to the main point position on the expansion side (1st group side) of the composition up to the 5th group, and at the same time, changing the focal length of the composition from the 2nd group to the 5th group. ..
Therefore, in the two-group zoom lens, the power of each group can be reduced and the "magnification" at the time of magnification can be reduced as compared with the case where the magnification is changed only by the distance between the principal points of the groups. The amount of movement of the moving group can be kept relatively small, and the amount of various aberrations generated can also be kept low.
The variable magnification ratio is given by the ratio fT / fW of the focal length at the telephoto end and the focal length at the wide-angle end, but the conditional equations (2) and (3) are for liquid crystal projectors while maintaining sufficient performance. This is a condition for securing the magnification ratio required for a zoom lens for projection.
In the conditional expression (2), when the lower limit of the condition is exceeded, the change in the "expansion side principal point position of the composition from the second group to the fifth group" becomes smaller than the required scaling ratio, and the "first" There is no choice but to increase the change in the "focal length of the composition from the 2nd group to the 5th group", and astigmatism, coma, etc. are greatly generated, which tends to cause deterioration of imaging performance.
In addition, when the upper limit is exceeded, the change in the "expansion side principal point position of the composition from the 2nd group to the 5th group" becomes too large compared to the required magnification ratio, and a wide fluctuation range of the moving group is secured. As a result, the entire lens becomes large.
In the conditional expression (3), when the lower limit of the condition is exceeded, the change in the "focal length of the composition from the second group to the fifth group" is small compared to the required scaling ratio, and the conditional expression (2) As in the case where the upper limit is exceeded, it is necessary to secure a wide scaling range of the moving group, which leads to an increase in the size of the entire lens.
When the upper limit of the conditional expression (3) is exceeded, the change in the "focal length of the composition from the second group to the fifth group" becomes too large compared to the required magnification ratio, resulting in astigmatism, coma, etc. The amount of generation is large, and the imaging performance tends to deteriorate.

【００１２】
【発明の実施の形態】
以下に、この発明の投射用ズームレンズの実施の形態として、具体的な実施例を６例挙げる。各実施例において、拡大側から数えて第ｉ番目の面（絞りＳの面を含む）の曲率半径（非球面にあっては近軸曲率半径）を「Ｒｉ」、拡大側から数えて第ｉ番目の面と第ｉ＋１番目の面の光軸上の面間隔を「Ｄｉ」とする。なお、ｉ＝ＩＭＧは「液晶パネルの画像表示面」を表し、ｉ＝０は「スクリーン」を表す。Ｄｏは「スクリーンから第１レンズ面までの距離」を表す。
拡大側から数えて第ｊ番目のレンズ材質の、ｄ線に対する屈折率をＮｊ、アッベ数をνｊとする。
非球面形状は以下の表示形式による。
Ｚ＝（１／Ｒｉ）・ｈ^２／［１＋√｛１−（Ｋ＋１）・（１／Ｒｉ）^２・ｈ^２｝］
＋Ａ・ｈ^４＋Ｂ・ｈ^６＋Ｃ・ｈ^８
この式において、Ｚ：光軸方向の座標、ｈ：光軸直交方向の座標、Ｒｉ：軸上曲率半径、Ｋ：円錐定数、Ａ，Ｂ，Ｃ：高次の係数であり、これらを与えて、非球面形状を特定する。計算基準波長は「５４６．１ｎｍ」である。 0012
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, six specific examples will be given as embodiments of the projection zoom lens of the present invention. In each embodiment, the radius of curvature (paraxial radius of curvature in the case of an aspherical surface) of the i-th surface (including the surface of the aperture S) counted from the enlarged side is "Ri", and the i-th surface counted from the enlarged side. The surface distance between the second surface and the i + 1th surface on the optical axis is defined as "Di". Note that i = IMG represents the “image display surface of the liquid crystal panel” and i = 0 represents the “screen”. Do represents "the distance from the screen to the first lens surface".
The refractive index of the jth lens material counted from the magnifying side with respect to the d line is Nj, and the Abbe number is νj.
The aspherical shape has the following display format.
Z = (1 / Ri) · h ² / [1 + √ {1- (K + 1) · (1 / Ri) ² · h ² }]
＋ A ・ h ⁴ ＋ B ・ h ⁶ ＋ C ・ h ⁸
In this equation, Z: coordinates in the optical axis direction, h: coordinates in the direction orthogonal to the optical axis, Ri: radius of curvature on the axis, K: conical constant, A, B, C: higher-order coefficients, and these are given. , Identify the aspherical shape. The calculation reference wavelength is "546.1 nm".

【００１３】
【実施例】
実施例１
ｉＲｉＤｉｊＮｊ νｊ
0: ∞ 1900.000
1: 146.871 2.867 1 1.74330 49.2
2: -24535.458 0.200
3: 74.956 1.600 2 1.48749 70.4
4: 19.419 可変
5: 134.975 1.600 3 1.48749 70.4
6: 21.744 5.229
7: 23.745 3.181 4 1.80610 33.3
8: 36.302 可変
9: 68.879 3.557 5 1.83500 43.0
10: -39.674 1.600 6 1.80518 25.5
11: -88.065 11.027
12:（絞り） ∞ 可変
13: -31.687 1.600 7 1.64769 33.8
14: 48.266 0.971
15: 467.096 4.069 8 1.61800 63.4
16: -21.417 2.258
17: -13.222 1.978 9 1.75520 27.5
18: -26.847 0.615
19: -40.629 6.389 10 1.62041 60.3
20: -19.151 0.200
21: -191.434 3.930 11 1.62041 60.3
22: -46.777 可変
23: 51.051 6.189 12 1.62041 60.3
24: -149.712 5.000
25: ∞ 28.200 13 1.51680 64.2
26: ∞ 6.789
IMG: ∞ 0.000
第２５面、第２６面は色合成プリズムの射出側面および入射側面である。
可変量
焦点距離 22.476 24.630 26.968
Ｄ4 5.229 5.351 5.540
Ｄ６ 11.832 6.854 1.733
Ｄ１２ 7.519 8.895 9.260
Ｄ２２ 1.000 4.480 9.047
条件式（１）の値０．３９
条件式（２）の値０．９４４（ｆＴ／ｆｗ＝１．２）
条件式（３）の値０．８４７（ｆＴ／ｆｗ＝１．２）
条件式（４）の値７０．４。 0013
【Example】
Example 1
i Ri Di j Nj νj
0: ∞ 1900.000
1: 146.871 2.867 1 1.74330 49.2
2: -24535.458 0.200
3: 74.956 1.600 2 1.48749 70.4
4: 19.419 Variable
5: 134.975 1.600 3 1.48749 70.4
6: 21.744 5.229
7: 23.745 3.181 4 1.80610 33.3
8: 36.302 Variable
9: 68.879 3.557 5 1.83500 43.0
10: -39.674 1.600 6 1.80518 25.5
11: -88.065 11.027
12: (Aperture) ∞ Variable
13: -31.687 1.600 7 1.64769 33.8
14: 48.266 0.971
15: 467.096 4.069 8 1.61800 63.4
16: -21.417 2.258
17: -13.222 1.978 9 1.75520 27.5
18: -26.847 0.615
19: -40.629 6.389 10 1.62041 60.3
20: -19.151 0.200
21: -191.434 3.930 11 1.62041 60.3
22: -46.777 Variable
23: 51.051 6.189 12 1.62041 60.3
24: -149.712 5.000
25: ∞ 28.200 13 1.51680 64.2
26: ∞ 6.789
IMG: ∞ 0.000
The 25th and 26th planes are the injection side surface and the incident side surface of the color synthesis prism.
Variable quantity
Focal length 22.476 24.630 26.968
D4 5.229 5.351 5.540
D6 11.832 6.854 1.733
D12 7.519 8.895 9.260
D22 1.000 4.480 9.047
Value of conditional expression (1) 0.39
Value of conditional expression (2) 0.944 (fT / fw = 1.2)
Value of conditional expression (3) 0.847 (fT / fw = 1.2)
The value of conditional expression (4) 70.4.

実施例６
ｉＲｉＤｉｊＮｊ νｊ
0: ∞ 1900.000
1: 54.635 1.600 1 1.48749 70.4
2: 17.640(＊1) 5.720
3: 106.385 1.600 2 1.48749 70.4
4: 21.425 可変
5: 34.343(＊2) 0.050 3 1.52052 52.0
6: 25.758 4.215 4 1.80610 33.3
7: 79.075 可変
8: 50.309 4.210 5 1.83500 43.0
9: -36.702 1.600 6 1.80518 25.5
10: -148.865 9.060
11（絞り） ∞ 可変
12: -32.024 1.600 7 1.64769 33.8
13: 47.116 0.999
14: 794.561 4.194 8 1.48749 70.4
15: -20.023 1.630
16: -14.178 1.600 9 1.75520 27.5
17: -27.672 1.179
18: -38.930 4.694 10 1.62041 60.3
19: -20.494 0.200
20: -583.908 4.548 11 1.62041 60.3
21: -42.824 可変
22: 48.531 6.171 12 1.62041 60.3
23: -146.327 5.000
24: ∞ 28.200 13 1.51680 64.2
25: ∞ 6.8
IMG: ∞ 0.000
（＊１）は非球面であり、非球面係数は以下のとおりである。
K = -0.263489，
A = -0.620044E-06，B =-0.945413E-08，C =0.166740E-10
(＊２) は、ガラスの基板上に薄いプラスチックを成型してなるハイブリッドタイプの非球面であり、非球面係数は以下のとおりである。
K = 0.183240，
A = 0.476384E-05，B = 0.180091E-08，C = 0.503202E-10
第２４面、第２５面は色合成プリズムの射出側面と入射側面である。
可変量
焦点距離 22.414 24.564 26.903
Ｄ４ 4.800 4.886 5.118
Ｄ７ 11.043 6.177 1.000
Ｄ１１ 8.286 9.771 10.552
Ｄ２１ 1.000 4.295 8.459
条件式（１）の値０．４３
条件式（２）の値０．９９（ｆＴ／ｆｗ＝１．２）
条件式（３）の値１．１１（ｆＴ／ｆｗ＝１．２）
条件式（４）の値７０．４。 Example 6
i Ri Di j Nj νj
0: ∞ 1900.000
1: 54.635 1.600 1 1.48749 70.4
2: 17.640 (* 1) 5.720
3: 106.385 1.600 2 1.48749 70.4
4: 21.425 Variable
5: 34.343 (* 2) 0.050 3 1.52052 52.0
6: 25.758 4.215 4 1.80610 33.3
7: 79.075 variable
8: 50.309 4.210 5 1.83500 43.0
9: -36.702 1.600 6 1.80518 25.5
10: -148.865 9.060
11 (Aperture) ∞ Variable
12: -32.024 1.600 7 1.64769 33.8
13: 47.116 0.999
14: 794.561 4.194 8 1.48749 70.4
15: -20.023 1.630
16: -14.178 1.600 9 1.75520 27.5
17: -27.672 1.179
18: -38.930 4.694 10 1.62041 60.3
19: -20.494 0.200
20: -583.908 4.548 11 1.62041 60.3
21: -42.824 Variable
22: 48.531 6.171 12 1.62041 60.3
23: -146.327 5.000
24: ∞ 28.200 13 1.51680 64.2
25: ∞ 6.8
IMG: ∞ 0.000
(* 1) is an aspherical surface, and the aspherical surface coefficient is as follows.
K = -0.263489,
A = -0.620044E-06, B = -0.945413E-08, C = 0.166740E-10
(* 2) is a hybrid type aspherical surface formed by molding a thin plastic on a glass substrate, and the aspherical surface coefficient is as follows.
K = 0.183240,
A = 0.476384E-05, B = 0.180091E-08, C = 0.503202E-10
The 24th and 25th surfaces are the injection side surface and the incident side surface of the color synthesis prism.
Variable focal length 22.414 24.564 26.903
D4 4.800 4.886 5.118
D7 11.043 6.177 1.000
D11 8.286 9.771 10.552
D21 1.000 4.295 8.459
Value of conditional expression (1) 0.43
Value of conditional expression (2) 0.99 (fT / fw = 1.2)
Value of conditional expression (3) 1.11 (fT / fw = 1.2)
The value of conditional expression (4) 70.4.