JPH11190821A - Zoom lens - Google Patents
Zoom lensInfo
- Publication number
- JPH11190821A JPH11190821A JP36711997A JP36711997A JPH11190821A JP H11190821 A JPH11190821 A JP H11190821A JP 36711997 A JP36711997 A JP 36711997A JP 36711997 A JP36711997 A JP 36711997A JP H11190821 A JPH11190821 A JP H11190821A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- lens group
- focal length
- lens unit
- wide
- 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
Landscapes
- Lenses (AREA)
Abstract
(57)【要約】 （修正有）
【課題】 小型で高性能のズームレンズを得る。
【解決手段】 スクリーンに拡大投射するテレセントリ
ックなズームレンズにおいて、スクリーン側から順に、
負の屈折力の第１レンズ群Ｌ１、正の屈折力の第２レン
ズ群Ｌ２、負の屈折力の第３レンズ群Ｌ３、正の屈折力
の第４レンズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５を
有し、広角端の焦点距離時に対し、望遠端の焦点距離時
には、第１レンズ群Ｌ１と第２レンズ群Ｌ２の間隔は減
少し、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔は増
大し、第３レンズ群Ｌ３と第４レンズ群Ｌ４の間隔は減
少し、第４レンズ群Ｌ４と第５レンズ群Ｌ５の間隔は増
大するように各レンズ群を適切に移動し、更に望ましく
は、第１レンズ群Ｌ１と第５レンズ群Ｌ５を固定とし、
残る第２レンズ群Ｌ２、第４レンズ群Ｌ４をスクリーン
側に移動して変倍、第３レンズ群Ｌ３は第２レンズ群Ｌ
２、第４レンズ群Ｌ４の移動に伴い動かす。
(57) [Summary] (with correction) [PROBLEMS] To obtain a compact and high-performance zoom lens. SOLUTION: In a telecentric zoom lens for magnifying and projecting onto a screen, in order from the screen side,
A first lens unit L1 having a negative refractive power, a second lens unit L2 having a positive refractive power, a third lens unit L3 having a negative refractive power, a fourth lens unit L4 having a positive refractive power, and a fourth lens unit L4 having a positive refractive power. At the focal length at the telephoto end, the distance between the first lens unit L1 and the second lens unit L2 is reduced, and the second lens unit L2 and the third lens unit L5 are provided. The distance between the third lens unit L3 and the fourth lens unit L4 decreases, and the distance between the fourth lens unit L4 and the fifth lens unit L5 increases. More preferably, the first lens unit L1 and the fifth lens unit L5 are fixed,
The remaining second lens unit L2 and fourth lens unit L4 are moved to the screen side to change the magnification, and the third lens unit L3 is moved to the second lens unit L.
2. Move with the movement of the fourth lens unit L4.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、画像を固定された
有限距離でスクリーンに拡大投射するプロジェクション
装置に用いられるズームレンズであり、特に表示体に色
光ごとに複数の液晶等を用いて、色合成して１個の投射
レンズを介して高精細な画像投射を行う簡易で小型な略
テレセントリック形式のズームレンズに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens used in a projection apparatus for enlarging and projecting an image on a screen at a fixed finite distance, and more particularly to a zoom lens using a plurality of liquid crystals for each color light on a display. The present invention relates to a simple and small zoom lens of a substantially telecentric type that synthesizes and projects a high-definition image through one projection lens.
【０００２】[0002]
【従来の技術】負の屈折力のレンズ群が先行するネガテ
ィブリード型のズームレンズは、比較的広画角化が容易
で、かつ近接撮影距離での性能が維持できる等の特長を
有しているが、反面、変倍のための移動量が増大し、ま
た高変倍化が難しい等の欠点を有している。2. Description of the Related Art A negative lead type zoom lens, which is preceded by a lens unit having a negative refractive power, has features such as relatively easy widening of the angle of view and maintenance of performance at a close-up shooting distance. However, on the other hand, it has disadvantages such as an increase in the amount of movement for zooming and difficulty in achieving high zooming.
【０００３】これらの欠点を改善し、レンズ系全体の小
型化及び高変倍化を図ったズームレンズが、例えば特公
昭４９−２３９１２号公報、特開昭５３−３４５３９号
公報、特開昭５７−１６３２１３号公報、特開昭５８−
４１１３号公報、特開昭６３−２４１５１１号公報、そ
して特開平２−２０１３１０号公報等に開示されてい
る。[0003] A zoom lens in which these disadvantages are improved and the entire lens system is miniaturized and high zoom ratio is disclosed in, for example, JP-B-49-23912, JP-A-53-34539 and JP-A-57-34539. JP-163213, JP-A-58-
No. 4113, JP-A-63-241511, and JP-A-2-201310.
【０００４】これらの各公報では、ズームレンズを物体
側から順に負、正、負、そして正の屈折力のレンズ群の
全体として４つのレンズ群より構成し、このうち所定の
レンズ群を適切に移動させて変倍を行っている。In each of these publications, a zoom lens is composed of four lens groups as a whole in order from the object side, including a lens group having negative, positive, negative, and positive refractive powers. Move and zoom.
【０００５】[0005]
【発明が解決しようとする課題】しかし本発明のよう
に、表示画像をスクリーンに拡大投射する際に、特に液
晶表示体を複数の色光ごとに分けて用い、各色光を合成
して１本の投射レンズにより投射する場合には、次の条
件を満足することが必要となる。However, as in the present invention, when a display image is enlarged and projected on a screen, a liquid crystal display is used for each of a plurality of color lights, and each color light is combined to form one image. When projecting with a projection lens, it is necessary to satisfy the following conditions.
【０００６】(1) 液晶の配光特性又は複数の色光を合成
するときの色合成ダイクロイックミラーの角度依存の影
響を排除するために、射出瞳が遠方にある所謂テレセン
トリック光学系であること。(1) A so-called telecentric optical system having an exit pupil at a distance in order to eliminate the influence of the light distribution characteristics of liquid crystal or the angle dependence of a color combining dichroic mirror when combining a plurality of color lights.
【０００７】(2) 表示体と投射レンズの間に介在する色
合成素子のスペースを確保するために、長いバックフォ
ーカスを必要とする。(2) In order to secure a space for a color combining element interposed between the display and the projection lens, a long back focus is required.
【０００８】(3) 通常では、表示画像をスクリーン上に
上方投射するために、投射レンズの光軸に対し表示体は
その中心位置がシフトした状態で用いられ、結果として
前玉付近は使用する有効領域が光軸対称ではなく、上方
に偏り、前玉径が大きくなるので改善手段が必要であ
る。(3) Normally, in order to project a display image upward on a screen, the display body is used with its center position shifted with respect to the optical axis of the projection lens, and as a result, the vicinity of the front lens is used. The effective area is not symmetric with respect to the optical axis, but is deflected upward, and the diameter of the front lens becomes large.
【０００９】このような要求事項に対し、先の従来例で
は射出瞳位置は有限であり、またバックフォーカスも十
分に長いとは云い難い。For such requirements, in the prior art, the exit pupil position is finite, and the back focus is hardly sufficiently long.
【００１０】本発明の目的は、上述の問題点を解消し、
簡易な構成、小型でかつ高性能なズームレンズを提供す
ることにある。An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a compact, high-performance zoom lens having a simple configuration.
【００１１】[0011]
【課題を解決するための手段】上述の目的を達成するた
めの本発明に係るズームレンズは、表示面の画像をスク
リーンに拡大投射する略テレセントリックなズームレン
ズにおいて、前記スクリーン側から順に、負の屈折力の
第１レンズ群、正の屈折力の第２レンズ群、負の屈折力
の第３レンズ群、正の屈折力の第４レンズ群、正の屈折
力の第５レンズ群を有し、広角端の焦点距離から望遠端
の焦点距離に遷移するときに、前記第２レンズ群、第４
レンズ群は前記スクリーン側に移動することを特徴とす
る。A zoom lens according to the present invention for achieving the above object is a substantially telecentric zoom lens for enlarging and projecting an image on a display surface onto a screen. A first lens group having a refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a positive refractive power. When transitioning from the focal length at the wide-angle end to the focal length at the telephoto end, the second lens group, the fourth lens group,
The lens group moves to the screen side.
【００１２】[0012]
【発明の実施の形態】本発明を図示の実施例に基づいて
詳細に説明する。図１は実施例１のレンズ断面図であ
り、スクリーンに拡大投射するテレセントリックなズー
ムレンズにおいて、スクリーン側から順に、負の屈折力
の第１レンズ群Ｌ１、正の屈折力の第２レンズ群Ｌ２、
負の屈折力の第３レンズ群Ｌ３、正の屈折力の第４レン
ズ群Ｌ４、正の屈折力の第５レンズ群Ｌ５を有してい
る。広角端の焦点距離時に対し、望遠端の焦点距離時に
は、第１レンズ群Ｌ１と第２レンズ群Ｌ２の間隔は減少
し、第２レンズ群Ｌ２と第３レンズ群Ｌ３の間隔は増大
し、第３レンズ群Ｌ３と第４レンズ群Ｌ４の間隔は減少
し、第４レンズ群Ｌ４と第５レンズ群Ｌ５の間隔は増大
するように各レンズ群を適切に移動し、更に望ましく
は、構成の簡易化のために、第１レンズ群Ｌ１と第５レ
ンズ群Ｌ５を固定とし、残る第２レンズ群Ｌ２、第４レ
ンズ群Ｌ４をスクリーン側に移動して変倍する。第３レ
ンズ群Ｌ３はこの際に第２レンズ群Ｌ２、第４レンズ群
Ｌ４の移動に伴う像面の変動を補正するように動かす
が、特にスクリーン側に凸の軌跡により移動することが
好ましい。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a sectional view of a lens according to a first embodiment. In a telecentric zoom lens that magnifies and projects a screen, a first lens unit L1 having a negative refractive power and a second lens unit L2 having a positive refractive power are sequentially arranged from the screen side. ,
The zoom lens includes a third lens unit L3 having a negative refractive power, a fourth lens unit L4 having a positive refractive power, and a fifth lens unit L5 having a positive refractive power. At the focal length at the telephoto end compared with the focal length at the wide-angle end, the distance between the first lens unit L1 and the second lens unit L2 decreases, and the distance between the second lens unit L2 and the third lens unit L3 increases. The distance between the third lens unit L3 and the fourth lens unit L4 is reduced, and the distance between the fourth lens unit L4 and the fifth lens unit L5 is appropriately moved so that each lens unit is moved. The first lens unit L1 and the fifth lens unit L5 are fixed, and the remaining second lens unit L2 and fourth lens unit L4 are moved to the screen side for zooming. At this time, the third lens unit L3 is moved so as to correct the change of the image plane due to the movement of the second lens unit L2 and the fourth lens unit L4, but it is particularly preferable that the third lens unit L3 be moved along a locus convex toward the screen.
【００１３】第５レンズ群Ｌ５は表示体に最も近く、比
較的強い正の屈折力を与えることにより、テレセントリ
ックな系を実現している。更に、スクリーン側に強い凸
面を向けた１枚の正レンズにより第５レンズ群Ｌ５を構
成し、軸外像面湾曲の補正と構成の簡易化の両立を達成
することが望ましい。The fifth lens unit L5 is closest to the display and provides a relatively strong positive refractive power to realize a telecentric system. Further, it is desirable that the fifth lens unit L5 be constituted by a single positive lens having a strong convex surface facing the screen side to achieve both correction of off-axis field curvature and simplification of the structure.
【００１４】第２レンズ群Ｌ２、第３レンズ群Ｌ３、第
４レンズ群Ｌ４を移動して変倍することで、各群の移動
量を減らしながら、高変倍率なズームレンズを達成する
ことができ、全長を短縮すると共に、入射瞳位置から前
玉までの距離を短くし、軸外斜光束で決まる前玉径の小
型化を可能としている。By moving the second lens unit L2, the third lens unit L3, and the fourth lens unit L4 to change the magnification, it is possible to achieve a high zoom ratio zoom lens while reducing the amount of movement of each unit. As a result, the overall length is shortened, the distance from the entrance pupil position to the front lens is shortened, and the diameter of the front lens determined by the off-axis oblique light flux can be reduced.
【００１５】第１レンズ群Ｌ１は負の屈折力を有し、色
合成素子のスペースのために長いバックフォーカスを確
保している。特に、バックフォーカスを長くするため
に、第１レンズ群Ｌ１にスクリーン側に凸面を有する負
メニスカスレンズを配置することが良い。更に、各群の
屈折力を適切に配置し、第１レンズ群Ｌ１をズーミング
中に固定とすることで、軸外斜光束の位置の変動を減少
し、構成の簡易化と共に全長が一定なレンズ系が達成で
きる。また、広角端での歪曲の低減のために第１レンズ
群Ｌ１の最も物体側には、凸レンズを配置して最も軸外
光束を通る位置での歪曲補正を行っている。The first lens unit L1 has a negative refractive power, and secures a long back focus for the space of the color combining element. In particular, in order to lengthen the back focus, it is preferable to dispose a negative meniscus lens having a convex surface on the screen side in the first lens unit L1. Further, by appropriately arranging the refracting power of each group and fixing the first lens unit L1 during zooming, the fluctuation of the position of the off-axis oblique light beam is reduced, and the lens has a simple structure and a constant overall length. A system can be achieved. In order to reduce distortion at the wide-angle end, a convex lens is disposed closest to the object side of the first lens unit L1 to perform distortion correction at a position passing the most off-axis light beam.
【００１６】有限距離へのピント合わせは第１レンズ群
Ｌ１で行うのが好ましいが、第３レンズ群や第５レンズ
群或いは複数のレンズ群で別な移動量により距離合わせ
をしてもよく、また全体で行ってもスクリーンを移動し
て行うこともできる。It is preferable that focusing to a finite distance is performed by the first lens unit L1, but the third lens unit, the fifth lens unit or a plurality of lens units may be used to adjust the distance by a different moving amount. In addition, it is possible to move the screen as a whole or to move the screen.
【００１７】図１に示す第１実施例は、広角端から望遠
端へのズーミングで、第１レンズ群Ｌ１と第５レンズ群
Ｌ５がズーミング中に固定で、第２レンズ群Ｌ２と第４
レンズ群Ｌ４がスクリーン側に移動すると共に、第３レ
ンズ群Ｌ３は望遠端近傍で変曲点をもってスクリーン側
に凸の軌跡で移動し、最も口径の大きな構成となってい
る。In the first embodiment shown in FIG. 1, during zooming from the wide-angle end to the telephoto end, the first lens unit L1 and the fifth lens unit L5 are fixed during zooming, and the second lens unit L2 and the fourth lens unit L5 are fixed.
As the lens unit L4 moves to the screen side, the third lens unit L3 moves along the locus convex toward the screen with an inflection point near the telephoto end, and has the largest aperture.
【００１８】図２に示す実施例２は、第１実施例と同様
に広角端から望遠端へのズーミングで、第１レンズ群Ｌ
１と第５レンズ群Ｌ５がズーミング中に固定で、第２レ
ンズ群Ｌ２と第４レンズ群Ｌ４がスクリーン側に移動す
ると共に、第３レンズ群Ｌ３は望遠端近傍で変曲点をも
ってスクリーン側に凸の軌跡で移動するものであり、変
倍比が大きい。In Embodiment 2 shown in FIG. 2, zooming from the wide-angle end to the telephoto end is performed similarly to the first embodiment, and the first lens unit L
The first and fifth lens units L5 are fixed during zooming, the second lens unit L2 and the fourth lens unit L4 move toward the screen, and the third lens unit L3 moves toward the screen with an inflection point near the telephoto end. It moves on a convex locus and has a large zoom ratio.
【００１９】図３に示す実施例３は、実施例２と別なレ
ンズ構成の実施例である。広角端から望遠端へのズーミ
ングで、第１レンズ群Ｌ１と第５レンズ群Ｌ５がズーミ
ング中に固定で、第２レンズ群Ｌ２と第４レンズ群Ｌ４
がスクリーン側に移動すると共に、第３レンズ群Ｌ３は
望遠端近傍で変曲点をもってスクリーン側に凸の軌跡で
移動する。Embodiment 3 shown in FIG. 3 is an embodiment having a different lens configuration from Embodiment 2. When zooming from the wide-angle end to the telephoto end, the first lens unit L1 and the fifth lens unit L5 are fixed during zooming, and the second lens unit L2 and the fourth lens unit L4 are fixed.
Moves to the screen side, and the third lens unit L3 moves along the locus convex toward the screen with an inflection point near the telephoto end.
【００２０】図４に示す実施例４は、広角端から望遠端
へのズーミングで、第１レンズ群Ｌ１がスクリーン側に
凸の軌跡で移動し、望遠端では広角端よりも表示パネル
側に位置し、第５レンズ群Ｌ５がズーミング中に固定
で、第２レンズ群Ｌ２と第４レンズ群Ｌ４がスクリーン
側に同じ移動量で移動すると共に、第３レンズ群Ｌ３は
望遠端近傍で変曲点をもってスクリーン側へ凸の軌跡で
移動する。In Embodiment 4 shown in FIG. 4, zooming from the wide-angle end to the telephoto end causes the first lens unit L1 to move along a locus convex toward the screen side, and is positioned closer to the display panel than the wide-angle end at the telephoto end. The fifth lens unit L5 is fixed during zooming, the second lens unit L2 and the fourth lens unit L4 move to the screen side by the same amount of movement, and the third lens unit L3 is located near the telephoto end at an inflection point. Moves to the screen side in a convex locus.
【００２１】図５に示す実施例５は、広角端から望遠端
へのズーミングで、第１レンズ群Ｌ１と第５レンズ群Ｌ
５がズーミング中に固定で、第２レンズ群Ｌ２と第４レ
ンズ群Ｌ４がスクリーン側へ移動すると共に、第３レン
ズ群Ｌ３もズーミング中に固定となっている。In Embodiment 5 shown in FIG. 5, zooming from the wide-angle end to the telephoto end is performed by using the first lens unit L1 and the fifth lens unit L1.
5 is fixed during zooming, the second lens unit L2 and the fourth lens unit L4 move to the screen side, and the third lens unit L3 is also fixed during zooming.
【００２２】更に望ましくは、これらの実施例におい
て、広角端、望遠端の全系の焦点距離をそれぞれｆｗ、
ｆｔ、第１レンズ群Ｌ１の焦点距離をｆ１、第２レンズ
群Ｌ２の焦点距離をｆ２、第３レンズ群Ｌ３の焦点距離
をｆ３、第４レンズ群Ｌ４の焦点距離をｆ４、第５レン
ズ群Ｌ５の焦点距離をｆ５とするとき、次の条件式を満
足することが好ましい。More preferably, in these embodiments, the focal lengths of the entire system at the wide-angle end and the telephoto end are respectively fw,
ft, the focal length of the first lens unit L1 is f1, the focal length of the second lens unit L2 is f2, the focal length of the third lens unit L3 is f3, the focal length of the fourth lens unit L4 is f4, and the fifth lens unit. When the focal length of L5 is f5, it is preferable to satisfy the following conditional expression.
【００２３】 １．１＜｜ｆ１｜／ｆ２＜２．３ …(1) ０．６＜ｆ２／（ｆｗ・ｆｔ）1/2 ＜１．２ …(2) 1.1 <| f1 | / f2 <2.3 (1) 0.6 <f2 / (fw · ft) 1/2 <1.2 (2)
【００２４】これらの条件式(1) 、(2) は主変倍群であ
る第２レンズ群Ｌ２と第１レンズ群Ｌ１の関係を適切に
規定したものであり、条件式(1) の下限を超えると第１
レンズ群Ｌ１で決まる前玉径が大きくなり、また広角端
での歪曲収差が大きくなり適当でない。また、上限値を
超えると所望の変倍比を得るために第２レンズ群Ｌ２の
移動量を大きくする必要があり全系が大型化し適当でな
い。These conditional expressions (1) and (2) appropriately define the relationship between the second lens unit L2 and the first lens unit L1, which are the main zooming units, and satisfy the lower limit of conditional expression (1). Exceeds 1
The diameter of the front lens determined by the lens unit L1 increases, and the distortion at the wide-angle end increases, which is not appropriate. If the value exceeds the upper limit, the amount of movement of the second lens unit L2 must be increased in order to obtain a desired zoom ratio.
【００２５】条件式(2) は主変倍群の屈折力を適切にす
るもので下限を超えると像面が補正過剰となり適当でな
い。また、上限を超えると所望の変倍比を得るために第
２レンズ群Ｌ２の移動量を大きくする必要があり、全系
が大型化し適当でない。Conditional expression (2) makes the refractive power of the main zooming unit appropriate. If the lower limit of the condition (2) is exceeded, the image plane is over-corrected, which is not appropriate. If the value exceeds the upper limit, it is necessary to increase the amount of movement of the second lens unit L2 in order to obtain a desired zoom ratio.
【００２６】特に、歪曲を適正に補正するためには、次
の式を満足することが好ましい。In particular, in order to properly correct the distortion, it is preferable to satisfy the following expression.
【００２７】 １＜｜ｆ１｜／ｆｗ＜２ …(3) 1 <| f1 | / fw <2 (3)
【００２８】この条件式(3) の上限を超えると広角端の
歪曲が適正にできなくなり、下限値を超えると望遠端の
歪曲を適正にできなくなる。If the upper limit of conditional expression (3) is exceeded, distortion at the wide-angle end cannot be properly performed, and if the lower limit value is exceeded, distortion at the telephoto end cannot be properly performed.
【００２９】なお、本明細書で云う略テレセントリック
系或いはテレセントリック系とは、上述したように液晶
の配光特性、又は複数の色光を合成する時の色合成ダイ
クロイックミラーの角度依存の影響を排除するために、
射出瞳が遠方（理想的には無限遠）にあることを示して
いる。具体的には、その角度依存性を配するためには、
ｔｋを表示パネルから（縮小側から）射出瞳までの距離
のズーミング中の絶対値で最小の値としたとき、 ｜ｔｋ｜／ｆｗ＞４．０ …(4) The term "substantially telecentric system" or "telecentric system" as used in the present specification excludes the influence of the angle distribution of the color synthesizing dichroic mirror when synthesizing a plurality of color lights as described above. for,
This indicates that the exit pupil is far (ideally at infinity). Specifically, in order to arrange the angle dependence,
When tk is the minimum absolute value during zooming of the distance from the display panel to the exit pupil (from the reduction side), | tk | / fw> 4.0 (4)
【００３０】更に、望ましくは以下の範囲に入っている
ことが望ましい。Further, it is desirable that the thickness falls within the following range.
【００３１】 ｜ｔｋ｜／ｆｗ＞９．０ …(4)'| Tk | / fw> 9.0 (4) ′
【００３２】主変倍群である第２レンズ群Ｌ２について
は、第２レンズ群Ｌ２の倍率β２の変化β２ｔ／β２ｗ
をＺ２、全系の焦点距離の変化ｆｔ／ｆｗをＺとし、変
倍群となる第２レンズ群Ｌ２と第４レンズ群Ｌ４のズー
ミングでの移動量をそれぞれＭ２、Ｍ４とすると、以下
の式を満たすことが良い。As for the second lens unit L2 which is the main zooming unit, the change β2t / β2w of the magnification β2 of the second lens unit L2.
Let Z2 be the focal length change ft / fw of the whole system, and let M2 and M4 be the moving amounts of the second lens unit L2 and the fourth lens unit L4, which are the zooming units, during zooming, respectively. Good to meet.
【００３３】 ０．８＜Ｚ２／Ｚ＜１．１ …(5) ０．９＜Ｍ２／Ｍ４＜１．６ …(6) ０．４＜Ｍ２／（ｆｔ−ｆｗ）＜１．０ …(7) 0.8 <Z2 / Z <1.1 (5) 0.9 <M2 / M4 <1.6 (6) 0.4 <M2 / (ft−fw) <1.0 ( 7)
【００３４】条件式(5) は変倍群となる第２レンズ群Ｌ
２と第４レンズ群Ｌ４での変倍の比を適切に規定するも
のある。第３レンズ群Ｌ３は変倍に際し減倍するため、
この範囲にあることが好ましい。条件式(6) 、(7) はレ
ンズ全体の長さと各変倍群の移動量を適切にするもので
ある。特に、第２レンズ群Ｌ２と第４レンズ群Ｌ４とで
は、第４レンズ群Ｌ４の方が屈折力が弱くなりがちであ
るので、適切な変倍分担をするにはこの範囲が好まし
い。特に、第２レンズ群Ｌ２の移動量が第４レンズ群Ｌ
４の移動量を超えていることが更に好ましい。Conditional expression (5) is satisfied by the second lens unit L which is a variable power unit.
The zoom ratio between the second lens unit L4 and the fourth lens unit L4 is appropriately defined. Since the third lens unit L3 reduces the magnification during zooming,
It is preferably within this range. Conditional expressions (6) and (7) make the length of the entire lens and the amount of movement of each zooming unit appropriate. Particularly, between the second lens unit L2 and the fourth lens unit L4, since the refractive power of the fourth lens unit L4 tends to be weaker, this range is preferable in order to appropriately share the magnification. In particular, when the amount of movement of the second lens unit L2 is
More preferably, the amount of movement exceeds 4.
【００３５】上述したように、第２レンズ群Ｌ２と第４
レンズ群Ｌ４とでは、第４レンズ群Ｌ４の方が屈折力が
弱くなりがちであり、特に次の式を満たすことが良い。As described above, the second lens unit L2 and the fourth
With respect to the lens unit L4, the fourth lens unit L4 tends to have a lower refractive power, and it is particularly preferable to satisfy the following expression.
【００３６】 ０．４＜ｆ２／ｆ４＜０．８ …(8) 0.4 <f2 / f4 <0.8 (8)
【００３７】条件式(8) と条件式(6) は主変倍群の屈折
力配置と変倍を適切にしながらペッツバール和を適当に
設定するのために必要な式である。The conditional expressions (8) and (6) are necessary for appropriately setting the Petzval sum while appropriately setting the refractive power arrangement and the zooming of the main zooming unit.
【００３８】全系の射出瞳と、歪曲を適当に設定するに
は、ｂｆを第５レンズ群Ｌ５から表示体までの距離と
し、ダイクロイックプリズム等を除いた空気換算長とす
ると、次の式を満たしているのが好ましい。In order to appropriately set the exit pupil of the entire system and the distortion, if bf is the distance from the fifth lens unit L5 to the display and the air conversion length excluding the dichroic prism and the like, the following equation is obtained. It is preferable to satisfy.
【００３９】 ０．３＜ｂｆ／ｆ５＜０．５ …(9) １．２＜｜ｆ１｜／ｂｆ＜２．２ …(10)0.3 <bf / f5 <0.5 (9) 1.2 <| f1 | / bf <2.2 (10)
【００４０】条件式(9) は全系を適切にテレセントリッ
ク系にするために必要な式である。上限値を超えると大
型化し、下限値を超えると歪曲が発生する。条件式(10)
も歪曲を適切にとりながら射出瞳を長くし、テレセント
リック系にするための条件である。Conditional expression (9) is necessary to make the entire system appropriately telecentric. Exceeding the upper limit will increase the size, and exceeding the lower limit will cause distortion. Conditional expression (10)
This is also a condition for elongating the exit pupil while appropriately taking distortion and making it telecentric.
【００４１】特に、最適にテレセントリック系にしなが
ら、レンズからパネルまでの距離を最適にするために、
次の条件式を満たすのが好ましい。In particular, in order to optimize the distance from the lens to the panel while optimally making it telecentric,
It is preferable that the following conditional expression is satisfied.
【００４２】 ２＜ｆ５／ｆｗ＜３．５ …(11)2 <f5 / fw <3.5 (11)
【００４３】この条件式(11)の下限値を超えると最適な
テレセントリック性を満足できず、上限値を超えると大
型化して適当ではない。If the lower limit value of the conditional expression (11) is exceeded, optimum telecentricity cannot be satisfied.
【００４４】更に、各群の屈折力配置を適切にしながら
各群の移動量を適切にして小型化をするには、以下の式
を満たすのが好ましい。Further, in order to reduce the size by appropriately moving each group while appropriately setting the refractive power arrangement of each group, it is preferable to satisfy the following expression.
【００４５】 １．０＜｜ｆ１｜／（ｆｗ・ｆｔ）1/2 ＜１．６ …(12) ０．６＜｜ｆ３｜／（ｆｗ・ｆｔ）1/2 ＜１．２ …(13) １．１＜ ｆ４ ／（ｆｗ・ｆｔ）1/2 ＜１．８ …(14) １．５＜ ｆ５ ／（ｆｗ・ｆｔ）1/2 ＜３．０ …(15)1.0 <| f1 | / (fw · ft) 1/2 <1.6 (12) 0.6 <| f3 | / (fw · ft) 1/2 <1.2 (13) ) 1.1 <f4 / (fw · ft) 1/2 <1.8 (14) 1.5 <f5 / (fw · ft) 1/2 <3.0 (15)
【００４６】特に、ズーミングにおける倍率色収差を低
減しながら、変動も抑えるために、第３レンズ群Ｌ３に
アッベ数ν3 が以下の範囲のレンズを有することが好ま
しい。In particular, in order to reduce the chromatic aberration of magnification during zooming and to suppress the fluctuation, it is preferable that the third lens unit L3 has a lens having an Abbe number ν3 in the following range.
【００４７】 ν3 ＞５５ …(16)Ν 3> 55 (16)
【００４８】特に、好ましくは、 ν3 ＞６０ … (16)' の範囲のレンズがあることが良い。In particular, it is preferable to have a lens in the range of ν3> 60 (16) '.
【００４９】また、第１レンズ群Ｌ１を構成する負レン
ズの平均アッベ数ν1nを、次式のように構成することに
より、色収差とそのズーミングによる変動を小さくする
ことができる。Further, by configuring the average Abbe number ν1n of the negative lens constituting the first lens unit L1 as follows, chromatic aberration and its fluctuation due to zooming can be reduced.
【００５０】 ν1n＞６０ …(17)Ν1n> 60 (17)
【００５１】次に、実施例１〜５の数値実施例１〜５を
示す。これらの数値実施例１〜５中で、riはスクリーン
側からｉ番目のレンズ面の曲率半径、diはｉ番目のレン
ズ厚又は空気間隔、ni、νi はｉ番目のレンズの屈折
率、アッベ数である。Next, Numerical Embodiments 1 to 5 of Embodiments 1 to 5 will be described. In these Numerical Examples 1 to 5, ri is the radius of curvature of the i-th lens surface from the screen side, di is the i-th lens thickness or air gap, ni and νi are the refractive index of the i-th lens, Abbe number It is.
【００５２】 数値実施例１ f=100.00000 〜129.3 Fno=1:1.8 〜2.1 2ω= 55°〜43.6° r1= 257.877 d1= 21.15 n1= 1.51633 ν1= 64.1 r2= -916.765 d2= 0.60 r3= 173.203 d3= 6.63 n2= 1.51633 ν2= 64.1 r4= 76.580 d4= 32.14 r5= -146.753 d5= 6.03 n3= 1.51633 ν3= 64.1 r6= 100.187 d6= 22.59 r7= 136.079 d7= 9.05 n4= 1.80518 ν4= 25.4 r8= 226.085 d8= 可変 r9= 458.458 d9= 8.52 n5= 1.77250 ν5= 49.6 r10= -458.585 d10=11.97 r11= 230.660 d11=20.02 n6= 1.69680 ν6= 55.5 r12= -92.414 d12= 4.22 n7= 1.80518 ν7= 25.4 r13= -204.747 d13=可変（絞り） r14= -117.639 d14= 3.92 n8= 1.51633 ν8= 64.1 r15= 117.639 d15= 9.65 n9= 1.80518 ν9= 25.4 r16= 145.223 d16=可変 r17= -443.581 d17=31.26 n10=1.69680 ν10=55.5 r18= -64.074 d18= 6.03 n11=1.80518 ν11=25.4 r19= -131.339 d19= 0.60 r20= 2090.520 d20=16.52 n12=1.60311 ν12=60.6 r21= -220.342 d21=可変 r22= 186.134 d22=18.37 n13=1.60311 ν13=60.6 r23=-4345.838 d23=20.25 r24= 0.000 d24=96.48 n14=1.51633 ν14=64.2 r25= 0.000 焦点距離 100.00 113.61 129.30 可変間隔d9 34.64 20.45 9.16 d13 42.21 50.54 61.65 d16 27.65 22.84 14.98 d21 3.02 13.68 21.73Numerical Example 1 f = 100.00000 to 129.3 Fno = 1: 1.8 to 2.1 2ω = 55 ° to 43.6 ° r1 = 257.877 d1 = 21.15 n1 = 1.51633 ν1 = 64.1 r2 = -916.765 d2 = 0.60 r3 = 173.203 d3 = 6.63 n2 = 1.51633 ν2 = 64.1 r4 = 76.580 d4 = 32.14 r5 = -146.753 d5 = 6.03 n3 = 1.51633 ν3 = 64.1 r6 = 100.187 d6 = 22.59 r7 = 136.079 d7 = 9.05 n4 = 1.80518 ν4 = 25.4 r8 = 226.085 d8 = Variable r9 = 458.458 d9 = 8.52 n5 = 1.77250 ν5 = 49.6 r10 = -458.585 d10 = 11.97 r11 = 230.660 d11 = 20.02 n6 = 1.69680 ν6 = 55.5 r12 = -92.414 d12 = 4.22 n7 = 1.80518 ν7 = 25.4 r13 = -204.747 d13 = Variable (aperture) r14 = -117.639 d14 = 3.92 n8 = 1.51633 ν8 = 64.1 r15 = 117.639 d15 = 9.65 n9 = 1.80518 ν9 = 25.4 r16 = 145.223 d16 = variable r17 = -443.581 d17 = 31.26 n10 = 1.69680 ν10 = 55.5 r18 = -64.074 d18 = 6.03 n11 = 1.80518 ν11 = 25.4 r19 = -131.339 d19 = 0.60 r20 = 2090.520 d20 = 16.52 n12 = 1.60311 ν12 = 60.6 r21 = -220.342 d21 = variable r22 = 186.134 d22 = 18.37 n13 = 1.60311 ν13 = 60.6 r23 = -4345.838 d23 = 20.25 r24 = 0.000 d24 = 96.48 n14 = 1.51633 ν14 = 64.2 r25 = 0.000 Focal length 100.00 113. 61 129.30 Variable interval d9 34.64 20.45 9.16 d13 42.21 50.54 61.65 d16 27.65 22.84 14.98 d21 3.02 13.68 21.73
【００５３】 数値実施例２ f=100.00000 〜158.97 Fno=1:2.3 〜3.0 2ω=50.5 °〜32.3° r1= 249.961 d1= 12.42 n1= 1.60311 ν1= 60.6 r2= -411.372 d2= 0.55 r3= 205.115 d3= 4.42 n2= 1.51633 ν2= 64.1 r4= 58.412 d4= 26.29 r5= -76.525 d5= 4.14 n3= 1.51633 ν3= 64.1 r6= 273.991 d6= 1.38 r7= 144.155 d7= 7.18 n4= 1.80518 ν4= 25.4 r8= 477.185 d8= 可変 r9= 238.906 d9= 7.45 n5= 1.83400 ν5= 37.2 r10= -238.906 d10= 0.41 r11= 236.764 d11=16.01 n6= 1.72000 ν6= 50.2 r12= -56.537 d12= 3.31 n7= 1.76182 ν7= 26.5 r13= -373.800 d13=可変（絞り） r14= -112.532 d14= 3.31 n8= 1.48749 ν8= 70.2 r15= 112.532 d15=可変 r16= -189.788 d16=17.94 n9= 1.69680 ν9= 55.5 r17= -59.517 d17= 2.76 r18= -58.018 d18= 4.97 n10=1.80518 ν10=25.4 r19= -105.595 d19= 1.38 r20=-1913.013 d20=11.04 n11=1.63854 ν11=55.4 r21= -201.683 d21=可変 r22= 205.826 d22=15.46 n12=1.63854 ν12=55.4 r23= -385.215 d23= 9.66 r24= 0.000 d24=82.82 n14=1.51633 ν14=64.2 r25= 0.000 焦点距離 100.00 130.63 158.97 可変間隔d9 39.86 15.98 3.17 d13 27.30 41.55 53.99 d16 39.54 28.81 13.83 d21 2.76 23.12 38.48Numerical Example 2 f = 100.00000 to 158.97 Fno = 1: 2.3 to 3.0 2ω = 50.5 ° to 32.3 ° r1 = 249.961 d1 = 12.42 n1 = 1.60311 ν1 = 60.6 r2 = -411.372 d2 = 0.55 r3 = 205.115 d3 = 4.42 n2 = 1.51633 ν2 = 64.1 r4 = 58.412 d4 = 26.29 r5 = -76.525 d5 = 4.14 n3 = 1.51633 ν3 = 64.1 r6 = 273.991 d6 = 1.38 r7 = 144.155 d7 = 7.18 n4 = 1.80518 ν4 = 25.4 r8 = 477.185 d8 = Variable r9 = 238.906 d9 = 7.45 n5 = 1.83400 ν5 = 37.2 r10 = -238.906 d10 = 0.41 r11 = 236.764 d11 = 16.01 n6 = 1.72000 ν6 = 50.2 r12 = -56.537 d12 = 3.31 n7 = 1.76182 ν7 = 26.5 r13 = -373.800 d13 = Variable (aperture) r14 = -112.532 d14 = 3.31 n8 = 1.48749 ν8 = 70.2 r15 = 112.532 d15 = variable r16 = -189.788 d16 = 17.94 n9 = 1.69680 ν9 = 55.5 r17 = -59.517 d17 = 2.76 r18 = -58.018 d18 = 4.97 n10 = 1.80518 ν10 = 25.4 r19 = -105.595 d19 = 1.38 r20 = -1913.013 d20 = 11.04 n11 = 1.63854 ν11 = 55.4 r21 = -201.683 d21 = variable r22 = 205.826 d22 = 15.46 n12 = 1.63854 ν12 = 55.4 r23 = -385.215 d23 = 9.66 r24 = 0.000 d24 = 82.82 n14 = 1.51633 ν14 = 64.2 r25 = 0.000 Focal length 100.00 130.63 158.97 Variable interval d9 39.86 15.98 3.17 d13 27.30 41.55 53.99 d16 39.54 28.81 13.83 d21 2.76 23.12 38.48
【００５４】 数値実施例３ f=100.00000 〜158.06 Fno=1:2.31〜3.0 2ω=50.3 °〜32.3° r1= 196.239 d1= 15.07 n1= 1.60311 ν1= 60.6 r2= -491.879 d2= 0.55 r3= 179.892 d3= 4.41 n2= 1.51633 ν2= 64.1 r4= 55.314 d4= 28.35 r5= -74.931 d5= 4.13 n3= 1.51633 ν3= 64.1 r6= 291.815 d6= 0.10 r7= 131.408 d7= 7.17 n4= 1.80518 ν4= 25.4 r8= 352.793 d8= 可変 r9= 231.211 d9= 7.99 n5= 1.83400 ν5= 37.2 r10= -221.515 d10= 0.48 r11= 413.645 d11=15.16 n6= 1.72000 ν6= 50.2 r12= -55.333 d12= 3.31 n7= 1.76182 ν7= 26.5 r13= -323.885 d13=可変（絞り） r14= -98.340 d14= 3.31 n8= 1.48749 ν8= 70.2 r15= 140.889 d15=可変 r16= -153.499 d16=19.30 n9= 1.69680 ν10=55.5 r17= -54.452 d17= 4.96 n10=1.80518 ν10=25.4 r18= -94.141 d18= 0.83 r19= 3043.936 d19=12.40 n11=1.63854 ν11=55.4 r20= -199.501 d20=可変 r21= 163.968 d21=17.37 n12=1.63854 ν12=55.4 r22=-21522.170 d22=25.52 r23= 0.000 d23=82.70 n13=1.51633 ν13=64.2 r24= 0.000 焦点距離 100.00 124.72 158.06 可変間隔d8 38.59 20.45 3.01 d13 27.71 41.43 60.14 d15 36.45 29.19 13.35 d20 2.76 16.57 28.99Numerical Example 3 f = 100.00000 to 158.06 Fno = 1: 2.31 to 3.0 2ω = 50.3 ° to 32.3 ° r1 = 196.239 d1 = 15.07 n1 = 1.60311 ν1 = 60.6 r2 = -491.879 d2 = 0.55 r3 = 179.892 d3 = 4.41 n2 = 1.51633 ν2 = 64.1 r4 = 55.314 d4 = 28.35 r5 = -74.931 d5 = 4.13 n3 = 1.51633 ν3 = 64.1 r6 = 291.815 d6 = 0.10 r7 = 131.408 d7 = 7.17 n4 = 1.80518 ν4 = 25.4 r8 = 352.793 d8 = Variable r9 = 231.211 d9 = 7.99 n5 = 1.83400 ν5 = 37.2 r10 = -221.515 d10 = 0.48 r11 = 413.645 d11 = 15.16 n6 = 1.72000 ν6 = 50.2 r12 = -55.333 d12 = 3.31 n7 = 1.76182 ν7 = 26.5 r13 = -323.885 d13 = Variable (aperture) r14 = -98.340 d14 = 3.31 n8 = 1.48749 ν8 = 70.2 r15 = 140.889 d15 = variable r16 = -153.499 d16 = 19.30 n9 = 1.69680 ν10 = 55.5 r17 = -54.452 d17 = 4.96 n10 = 1.80518 ν10 = 25.4 r18 = -94.141 d18 = 0.83 r19 = 3043.936 d19 = 12.40 n11 = 1.63854 ν11 = 55.4 r20 = -199.501 d20 = variable r21 = 163.968 d21 = 17.37 n12 = 1.63854 ν12 = 55.4 r22 = -21522.170 d22 = 25.52 r23 = 0.000 d23 = 82.70 n13 = 1.51633 ν13 = 64.2 r24 = 0.000 Focal length 100.00 124.72 158.06 Variable interval d8 38.59 20.45 3.01 d13 27.71 41.43 60.14 d15 36.45 29.19 13.35 d20 2.76 16.57 28.99
【００５５】 数値実施例４ f=100.00000 〜154.3 Fno=1:2.5 〜3.0 2ω=55.8 °〜36.5° r1= -1988.193 d1= 9.69 n1= 1.77250 ν1= 49.6 r2= -296.881 d2= 0.29 r3= 186.766 d3= 4.84 n2= 1.48749 ν2= 70.2 r4= 71.563 d4= 29.18 r5= -86.237 d5= 4.54 n3= 1.48749 ν3= 70.2 r6= 431.800 d6= 3.03 r7= 370.629 d7= 7.57 n4= 1.84666 ν4= 23.8 r8= -1187.571 d8= 可変（絞り） r9= 129.582 d9= 9.69 n5= 1.60311 ν5= 60.6 r10= -263.492 d10= 0.45 r11= 152.292 d11=13.02 n6= 1.69680 ν6= 55.5 r12= -90.645 d12= 3.63 n7= 1.75520 ν7= 27.5 r13= -887.546 d13=可変 r14= -134.654 d14= 3.63 n8= 1.63854 ν8= 55.4 r15= 87.770 d15= 2.97 r16= 166.658 d16= 6.66 n9= 1.69680 ν10=55.5 r17= -963.346 d17= 3.63 n10=1.80518 ν10=25.4 r18= 273.134 d18=可変 r19= -240.499 d19=13.63 n11=1.69680 ν11=55.5 r20= -96.487 d20= 6.96 r21= -62.030 d21= 7.57 n12=1.74077 ν12=27.8 r22= -85.500 d22= 1.57 r23= -236.107 d24=12.11 n13=1.69680 ν13=55.5 r24= -106.664 d24=可変 r25= 174.522 d25=16.65 n14=1.69680 ν14=55.5 r26= -946.850 d26= 4.54 r27= 0.000 d27=90.84 n15=1.51633 ν13=64.2 r28= 0.000 焦点距離 100.00 118.18 154.34 可変間隔d8 61.13 36.56 3.14 d13 29.66 33.09 44.81 d18 21.88 18.45 6.73 d24 3.38 19.22 31.16Numerical Example 4 f = 100.00000 to 154.3 Fno = 1: 2.5 to 3.0 2ω = 55.8 ° to 36.5 ° r1 = -1988.193 d1 = 9.69 n1 = 1.77250 ν1 = 49.6 r2 = -296.881 d2 = 0.29 r3 = 186.766 d3 = 4.84 n2 = 1.48749 ν2 = 70.2 r4 = 71.563 d4 = 29.18 r5 = -86.237 d5 = 4.54 n3 = 1.48749 ν3 = 70.2 r6 = 431.800 d6 = 3.03 r7 = 370.629 d7 = 7.57 n4 = 1.84666 ν4 = 23.8 r8 = -1187.571 d8 = Variable (aperture) r9 = 129.582 d9 = 9.69 n5 = 1.60311 ν5 = 60.6 r10 = -263.492 d10 = 0.45 r11 = 152.292 d11 = 13.02 n6 = 1.69680 ν6 = 55.5 r12 = -90.645 d12 = 3.63 n7 = 1.75520 ν7 = 27.5 r13 = -887.546 d13 = variable r14 = -134.654 d14 = 3.63 n8 = 1.63854 ν8 = 55.4 r15 = 87.770 d15 = 2.97 r16 = 166.658 d16 = 6.66 n9 = 1.69680 ν10 = 55.5 r17 = -963.346 d17 = 3.63 n10 = 1.80518 ν10 = 25.4 r18 = 273.134 d18 = variable r19 = -240.499 d19 = 13.63 n11 = 1.69680 ν11 = 55.5 r20 = -96.487 d20 = 6.96 r21 = -62.030 d21 = 7.57 n12 = 1.74077 ν12 = 27.8 r22 = -85.500 d22 = 1.57 r23 = -236.107 d24 = 12.11 n13 = 1.69680 v13 = 55.5 r24 = -106.664 d24 = variable r25 = 174.522 d25 = 16.65 n14 = 1.69680 v14 = 55.5 r26 = -946 .850 d26 = 4.54 r27 = 0.000 d27 = 90.84 n15 = 1.51633 ν13 = 64.2 r28 = 0.000 Focal length 100.00 118.18 154.34 Variable spacing d8 61.13 36.56 3.14 d13 29.66 33.09 44.81 d18 21.88 18.45 6.73 d24 3.38 19.22 31.16
【００５６】 数値実施例５ f=100.00000 〜150.15 Fno=1:2.4 〜3.0 2ω=53.1 °〜35.5° r1= 172.840 d1= 17.04 n1= 1.74320 ν1= 49.3 r2= -3756.301 d2= 0.28 r3= 238.065 d3= 4.70 n2= 1.48749 ν2= 70.2 r4= 62.862 d4= 37.62 r5= -100.083 d5= 4.41 n3= 1.57099 ν3= 50.8 r6= 172.304 d6= 1.25 r7= 125.526 d7= 5.88 n4= 1.84666 ν4= 23.8 r8= 234.088 d8= 可変 r9= 379.046 d9= 7.35 n5= 1.80400 ν5= 46.6 r10= -169.885 d10= 0.44 r11= 135.550 d11= 9.70 n6= 1.74320 ν6= 49.3 r12= -91.631 d12= 3.53 n7= 1.75520 ν7= 27.5 r13= 403.913 d13=可変（絞り） r14= -142.892 d14= 3.53 n8= 1.48749 ν8= 70.2 r15= 107.820 d15= 2.49 r16= 119.454 d16= 5.29 n9= 1.84666 ν9=23.8 r17= 143.772 d17=可変 r18= 546.045 d18=15.20 n10=1.83481 ν10=42.7 r19= -103.896 d19= 5.31 r20= -88.135 d20= 5.29 n11=1.76182 ν11=26.5 r21= 192.346 d21= 6.57 r22= 251.818 d22=24.10 n12=1.74320 ν12=49.3 r23= -137.445 d23=可変 r24= 472.968 d24= 9.40 n13=1.74320 ν13=49.3 r25=-1071.045 d25= 0.44 r26= 191.838 d26= 9.40 n14=1.74320 ν14=49.3 r27= 472.256 d27=10.29 r28= 0.000 d28=88.16 n15=1.51633 ν15=64.2 r29= 0.000 焦点距離 100.00 136.30 150.15 可変間隔d8 33.97 8.76 2.81 d13 17.54 42.76 48.71 d17 32.31 17.92 8.33 d23 2.93 17.32 26.91Numerical Example 5 f = 100.00000 to 150.15 Fno = 1: 2.4 to 3.0 2ω = 53.1 ° to 35.5 ° r1 = 172.840 d1 = 17.04 n1 = 1.74320 ν1 = 49.3 r2 = -3756.301 d2 = 0.28 r3 = 238.065 d3 = 4.70 n2 = 1.48749 ν2 = 70.2 r4 = 62.862 d4 = 37.62 r5 = -100.083 d5 = 4.41 n3 = 1.57099 ν3 = 50.8 r6 = 172.304 d6 = 1.25 r7 = 125.526 d7 = 5.88 n4 = 1.84666 ν4 = 23.8 r8 = 234.088 d8 = Variable r9 = 379.046 d9 = 7.35 n5 = 1.80400 ν5 = 46.6 r10 = -169.885 d10 = 0.44 r11 = 135.550 d11 = 9.70 n6 = 1.74320 ν6 = 49.3 r12 = -91.631 d12 = 3.53 n7 = 1.75520 ν7 = 27.5 r13 = 403.913 d13 = Variable (Aperture) r14 = -142.892 d14 = 3.53 n8 = 1.48749 ν8 = 70.2 r15 = 107.820 d15 = 2.49 r16 = 119.454 d16 = 5.29 n9 = 1.84666 ν9 = 23.8 r17 = 143.772 d17 = variable r18 = 546.045 d18 = 15.20 n10 = 1.83481 ν10 = 42.7 r19 = -103.896 d19 = 5.31 r20 = -88.135 d20 = 5.29 n11 = 1.76182 ν11 = 26.5 r21 = 192.346 d21 = 6.57 r22 = 251.818 d22 = 24.10 n12 = 1.74320 ν12 = 49.3 r23 = -137.445 d23 = variable r24 = 472.968 d24 = 9.40 n13 = 1.74320 ν13 = 49.3 r25 = -1071.045 d25 = 0.44 r26 = 191.838 d26 = 9.40 n14 = 1.7432 0 ν14 = 49.3 r27 = 472.256 d27 = 10.29 r28 = 0.000 d28 = 88.16 n15 = 1.51633 ν15 = 64.2 r29 = 0.000 Focal length 100.00 136.30 150.15 Variable interval d8 33.97 8.76 2.81 d13 17.54 42.76 48.71 d17 32.31 17.92 8.33 d23 2.93 17.32
【００５７】また、次表は実施例１〜５におけるレンズ
系の各数値、条件式の数値である。The following table shows the numerical values of the lens system and the numerical values of the conditional expressions in Examples 1 to 5.
【００５８】 式番号 実施例１ 実施例２ 実施例３ 実施例４ 実施例５ β２ｗ -0.9887 -0.8267 -0.9129 -0.4975 -1.0119 β２ｔ -1.2624 -1.2431 -1.3801 -0.7438 -1.5083 β４ｗ -0.3192 -0.1594 -0.2908 0.099 -0.1118 β４ｔ -0.4336 -0.3426 -0.4506 -0.0467 -0.2451 Ｚ(=ft/fw) 1.293215 1.589747 1.580577 1.543439 1.501484 Ｚ２ 1.276828 1.503689 1.511776 1.495075 1.490562 Ｚ４ 1.358396 2.14931 1.549519 -0.47172 2.192308Formula No. Example 1 Example 2 Example 3 Example 4 Example 5 β2w -0.9887 -0.8267 -0.9129 -0.4975 -1.0119 β2t -1.2624 -1.2431 -1.3801 -0.7438 -1.5083 β4w -0.3192 -0.1594 -0.2908 0.099 -0.1118 β4t -0.4336 -0.3426 -0.4506 -0.0467 -0.2451 Z (= ft / fw) 1.293215 1.589747 1.580577 1.543439 1.501484 Z2 1.276828 1.503689 1.511776 1.495075 1.490562 Z4 1.358396 2.14931 1.549519 -0.47172 2.192308
【００５９】 (12) f1/(fw・ft)1/2 -1.31352 -1.1461 -1.2043 -1.41822 -1.25413 (2) f2/(fw・ft)1/2 1.021893 0.718257 0.763224 0.701503 0.78199 (11) f3/(fw・ft)1/2 -1.16191 -0.91104 -0.9407 -0.72778 -1.20923 (14) f4/(fw・ft)1/2 1.439296 1.546381 1.30547 1.534361 1.469586 (15) f5/(fw・ft)1/2 2.606882 1.683398 2.027713 1.712783 1.77807 (8) ｆ２／ｆ４ 0.709995 0.464476 0.584635 0.457196 0.532116 (3) ｆ１／ｆｗ -1.49373 -1.44506 -1.51406 -1.76192 -1.53675 (1) ｆ１／ｆ２ -1.28538 -1.59567 -1.57791 -2.02168 -1.60377 (5) Ｚ２／Ｚ 0.987329 0.945867 0.956471 0.968665 0.992726 (6) Ｍ２／Ｍ４ 1.361473 1.027484 1.356137 1 1.2995 (9) ｂｆ／ｆ５ 0.380981 0.48291 0.418234 0.409213 0.416409 (10) ｆ１／ｂｆ -1.32255 -1.40984 -1.42007 -2.02344 -1.69384 (7) Ｍ２/(ft-fw) -0.869 -0.62229 -0.61283 -0.51118 -0.62143 (11) ｆ５／ｆｗ 2.964536 2.122515 2.549261 2.127881 2.178759 (4) ｔｋ／ｆｗ -14.6866 -9.25914 -8.50135 -13.7775 -9.60034(12) f1 / (fw ・ ft) 1/2 -1.31352 -1.1461 -1.2043 -1.41822 -1.25413 (2) f2 / (fw ・ ft) 1/2 1.021893 0.718257 0.763224 0.701503 0.78199 (11) f3 / ( (fw ・ ft) 1/2 -1.16191 -0.91104 -0.9407 -0.72778 -1.20923 (14) f4 / (fw ・ ft) 1/2 1.439296 1.546381 1.30547 1.534361 1.469586 (15) f5 / (fw ・ ft) 1/2 2.606882 1.683398 2.027713 1.712783 1.77807 (8) f2 / f4 0.709995 0.464476 0.584635 0.457196 0.532116 (3) f1 / fw -1.49373 -1.44506 -1.51406 -1.76192 -1.53675 (1) f1 / f2 -1.28538 -1.59567 -1.57791 -2.02168 -1.60377 (5) Z2 / Z 0.987329 0.945867 0.956471 0.968665 0.992726 (6) M2 / M4 1.361473 1.027484 1.356137 1 1.2995 (9) bf / f5 0.380981 0.48291 0.418234 0.409213 0.416409 (10) f1 / bf -1.32255 -1.40984 -1.42007 -2.02344 -1.69384 (7) M2 (ft-fw) -0.869 -0.62229 -0.61283 -0.51118 -0.62143 (11) f5 / fw 2.964536 2.122515 2.549261 2.127881 2.178759 (4) tk / fw -14.6866 -9.25914 -8.50135 -13.7775 -9.60034
【００６０】更に、図６〜図１５は各実施例１〜５の収
差図である。FIGS. 6 to 15 are aberration diagrams of the first to fifth embodiments.
【００６１】[0061]
【発明の効果】以上説明したように本発明に係るズーム
レンズは、簡易な構成で明るく小型で高変倍で歪曲も小
さく倍率色収差の発生も少なく、高精細な画像投影を行
い簡易で小型化を達成することができる。As described above, the zoom lens according to the present invention has a simple structure, is bright, small, has high zoom ratio, has little distortion, and has little chromatic aberration of magnification. Can be achieved.
【図１】第１実施例のレンズ断面図である。FIG. 1 is a sectional view of a lens according to a first embodiment.
【図２】実施例２のレンズ断面図である。FIG. 2 is a sectional view of a lens according to a second embodiment.
【図３】実施例３のレンズ断面図である。FIG. 3 is a sectional view of a lens according to a third embodiment.
【図４】実施例４のレンズ断面図である。FIG. 4 is a sectional view of a lens according to a fourth embodiment.
【図５】実施例５のレンズ断面図である。FIG. 5 is a sectional view of a lens according to a fifth embodiment.
【図６】第１実施例の広角状態の収差図である。FIG. 6 is an aberration diagram of the first embodiment in a wide-angle state.
【図７】第１実施例の望遠状態の収差図である。FIG. 7 is an aberration diagram of the first embodiment in a telephoto state.
【図８】実施例２の広角状態の収差図である。FIG. 8 is an aberration diagram of a wide-angle state according to the second embodiment.
【図９】実施例２の望遠状態の収差図である。FIG. 9 is an aberration diagram of a telephoto state according to the second embodiment.
【図１０】実施例３の広角状態の収差図である。FIG. 10 is an aberration diagram of a wide-angle state according to the third embodiment.
【図１１】実施例３の望遠状態の収差図である。FIG. 11 is an aberration diagram of a telephoto state according to the third embodiment.
【図１２】実施例４の広角状態の収差図である。FIG. 12 is an aberration diagram of a wide-angle state according to the fourth embodiment.
【図１３】実施例４の望遠状態の収差図である。FIG. 13 is an aberration diagram of a telephoto state according to the fourth embodiment.
【図１４】実施例５の広角状態の収差図である。14 is an aberration diagram of Example 5 in a wide-angle state. FIG.
【図１５】実施例５の望遠状態の収差図である。FIG. 15 is an aberrational diagram of the fifth embodiment in a telephoto state.
Ｌ１ 第１レンズ群 Ｌ２ 第２レンズ群 Ｌ３ 第３レンズ群 Ｌ４ 第４レンズ群 Ｌ５ 第５レンズ群 ΔＭ メリディオナル焦線 ΔＳ サジタル焦線 L1 First lens group L2 Second lens group L3 Third lens group L4 Fourth lens group L5 Fifth lens group ΔM Meridional focal line ΔS Sagittal focal line
Claims (17)
る略テレセントリックなズームレンズにおいて、前記ス
クリーン側から順に、負の屈折力の第１レンズ群、正の
屈折力の第２レンズ群、負の屈折力の第３レンズ群、正
の屈折力の第４レンズ群、正の屈折力の第５レンズ群を
有し、広角端の焦点距離から望遠端の焦点距離に遷移す
るときに、前記第２レンズ群、第４レンズ群は前記スク
リーン側に移動することを特徴とするズームレンズ。1. A substantially telecentric zoom lens for enlarging and projecting an image on a display surface onto a screen, wherein a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a negative lens are arranged in this order from the screen side. A third lens group having a refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a positive refractive power. When the focal length at the wide-angle end changes to the focal length at the telephoto end, A zoom lens wherein the second lens group and the fourth lens group move toward the screen.
端の焦点距離時には、前記第２レンズ群と前記第３レン
ズ群の間隔は増大し、前記第３レンズと前記第４レンズ
群の間隔は減少する請求項１に記載のズームレンズ。2. The distance between the second lens group and the third lens group increases at the focal length at the telephoto end with respect to the focal length at the wide-angle end, and the distance between the third lens and the fourth lens group. The zoom lens according to claim 1, wherein?
端の焦点距離時には、前記第１レンズ群と前記第２レン
ズ群の間隔は減少し、前記第２レンズ群と前記第３レン
ズ群の間隔は増大し、前記第３レンズと前記第４レンズ
群の間隔は減少し、前記第４レンズと前記第５レンズ群
の間隔は増大する請求項２に記載のズームレンズ。3. At the focal length at the telephoto end with respect to the focal length at the wide-angle end, the distance between the first lens group and the second lens group is reduced, and the distance between the second lens group and the third lens group is reduced. The zoom lens according to claim 2, wherein an interval increases, an interval between the third lens and the fourth lens group decreases, and an interval between the fourth lens and the fifth lens group increases.
レンズと１枚の負レンズで構成し、前記第３レンズ群は
少なくとも１枚の負レンズで構成した請求項１に記載の
ズームレンズ。4. The zoom lens according to claim 1, wherein the second lens group includes at least two positive lenses and one negative lens, and the third lens group includes at least one negative lens. .
記望遠端の全系の焦点距離をｆｔ、前記第１レンズ群の
焦点距離をｆ１、前記第２レンズ群の焦点距離をｆ２、
前記第３レンズ群の焦点距離をｆ３、前記第４レンズ群
の焦点距離をｆ４、前記第５レンズ群の焦点距離をｆ５
としたとき、次の条件式を満足する請求項１に記載のズ
ームレンズ。 １．１＜｜ｆ１｜／ｆ２＜２．３ ０．６＜ｆ２／（ｆｗ・ｆｔ）1/2 5. The focal length of the entire system at the wide-angle end is fw, the focal length of the entire system at the telephoto end is ft, the focal length of the first lens group is f1, and the focal length of the second lens group is f2. ,
The focal length of the third lens group is f3, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group is f5.
The zoom lens according to claim 1, wherein the following conditional expression is satisfied: 1.1 <| f1 | / f2 <2.3 0.6 <f2 / (fw · ft) 1/2
の焦点距離時に遷移するとき、前記第２レンズ群と前記
第４レンズ群は前記スクリーン側に移動すると共に、前
記第３レンズ群は前記広角端から前記望遠端の位置の方
が前記スクリーン側にある請求項１又は５に記載のズー
ムレンズ。6. When transitioning from the focal length at the wide-angle end to the focal length at the telephoto end, the second lens group and the fourth lens group move to the screen side, and the third lens group The zoom lens according to claim 1, wherein a position from the wide-angle end to the telephoto end is closer to the screen.
の焦点距離時に遷移するとき、前記第２レンズ群と前記
第４レンズ群は前記スクリーン側に移動すると共に前記
第３レンズ群は前記スクリーン側に凸の軌跡で移動する
請求項６に記載のズームレンズ。7. When transitioning from the focal length at the wide-angle end to the focal length at the telephoto end, the second lens group and the fourth lens group move to the screen side, and the third lens group moves toward the screen. The zoom lens according to claim 6, wherein the zoom lens moves along a locus convex toward the screen side.
の焦点距離時に遷移するとき、前記第１レンズ群はズー
ミングに際し固定している請求項３に記載のズームレン
ズ。8. The zoom lens according to claim 3, wherein the first lens group is fixed during zooming when transitioning from the focal length at the wide-angle end to the focal length at the telephoto end.
の焦点距離時に遷移するとき、前記第１レンズ群はズー
ミングに際し可動である請求項３に記載のズームレン
ズ。9. The zoom lens according to claim 3, wherein the first lens group is movable during zooming when transitioning from the focal length at the wide-angle end to the focal length at the telephoto end.
前記第１レンズ群の焦点距離をｆ１としたとき、次の条
件式を満足する請求項１に記載のズームレンズ。 １＜｜ｆ１｜／ｆｗ＜２10. The focal length of the whole view at the wide angle end is fw,
The zoom lens according to claim 1, wherein the following conditional expression is satisfied when a focal length of the first lens group is f1. 1 <| f1 | / fw <2
表示面から射出瞳までの距離の絶対値で最小の値をｔｋ
としたとき、次の条件式を満足する請求項１に記載のズ
ームレンズ。 ｜ｔｋ｜／ｆｗ＞４．０11. The focal length at the wide-angle end of the entire system is fw, and the minimum absolute value of the distance from the display surface to the exit pupil is tk.
The zoom lens according to claim 1, wherein the following conditional expression is satisfied: | Tk | / fw> 4.0
倍率の比をＺ２、全系の広角端と望遠端の焦点距離の比
をＺ、前記第２レンズ群と前記第４レンズ群のズーミン
グの際の移動量をそれぞれＭ２、Ｍ４としたとき、次の
条件式を満足する請求項１に記載のズームレンズ。 ０．８＜Ｚ２／Ｚ＜１．１ ０．９＜Ｍ２／Ｍ４＜１．６ ０．４＜Ｍ２／（ｆｔ−ｆｗ）＜１．０12. The ratio of the magnification between the telephoto end and the wide-angle end of the second lens group is Z2, the ratio of the focal length between the wide-angle end and the telephoto end of the entire system is Z, and the second lens group and the fourth lens group. The zoom lens according to claim 1, wherein the following conditional expressions are satisfied when the moving amounts during zooming are M2 and M4, respectively. 0.8 <Z2 / Z <1.1 0.9 <M2 / M4 <1.6 0.4 <M2 / (ft-fw) <1.0
点距離をそれぞれｆ２、ｆ４としたとき、次の条件式を
満足する請求項１２に記載のズームレンズ。 ０．４＜ｆ２／ｆ４＜０．８13. The zoom lens according to claim 12, wherein the following conditional expression is satisfied when the focal lengths of the second lens unit and the fourth lens unit are f2 and f4, respectively. 0.4 <f2 / f4 <0.8
の焦点距離をそれぞれｆ１、ｆ５、前記表示面から前記
第５レンズ群の最も表示面側のレンズ面までの空気換算
長をｂｆとしたとき、次の条件式を満足する請求項１に
記載のズームレンズ。 ０．３＜ｂｆ／ｆ５＜０．５ １．２＜｜ｆ１｜／ｂｆ＜２．２14. The focal lengths of the first lens unit and the fifth lens unit are f1 and f5, respectively, and the air conversion length from the display surface to the lens surface closest to the display surface of the fifth lens unit is bf. The zoom lens according to claim 1, wherein the following conditional expression is satisfied. 0.3 <bf / f5 <0.5 1.2 <| f1 | / bf <2.2
れぞれｆｗ、ｆｔ、前記第１レンズ群、第３レンズ群、
第４レンズ群、第５レンズ群の焦点距離をそれぞれｆ
１、ｆ３、ｆ４、ｆ５としたとき、次の条件式を満足す
る請求項１に記載のズームレンズ。 １．０＜｜ｆ１｜／（ｆｗ・ｆｔ）1/2 ＜１．６ ０．６＜｜ｆ３｜／（ｆｗ・ｆｔ）1/2 ＜１．２ １．１＜ｆ４／（ｆｗ・ｆｔ）1/2 ＜１．８ １．５＜ｆ５／（ｆｗ・ｆｔ）1/2 ＜３．０15. The focal lengths of the entire system at the wide-angle end and the telephoto end are respectively fw and ft, the first lens group, the third lens group,
The focal lengths of the fourth lens group and the fifth lens group are respectively f
The zoom lens according to claim 1, wherein the following conditional expressions are satisfied when 1, f3, f4, and f5 are satisfied. 1.0 <| f1 | / (fw · ft) 1/2 <1.6 0.6 <| f3 | / (fw · ft) 1/2 <1.2 1.1 <f4 / (fw · ft) ) 1/2 <1.8 1.5 <f5 / (fw · ft) 1/2 <3.0
したとき、次の条件式を満足する請求項１に記載のズー
ムレンズ。 ν3 ＞５５16. The zoom lens according to claim 1, wherein the following conditional expression is satisfied when the Abbe number of the third lens group is ν3. ν3> 55
平均アッベ数をν1nとしたとき、次の条件式を満足する
請求項１に記載のズームレンズ。 ν1n＞６０17. The zoom lens according to claim 1, wherein the following conditional expression is satisfied when an average Abbe number of the negative lens included in the first lens group is ν1n. ν1n> 60
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36711997A JP4006073B2 (en) | 1997-12-25 | 1997-12-25 | Zoom lens |
| US09/407,077 US6285509B1 (en) | 1997-12-25 | 1999-09-28 | Zoom lens and display apparatus having the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36711997A JP4006073B2 (en) | 1997-12-25 | 1997-12-25 | Zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11190821A true JPH11190821A (en) | 1999-07-13 |
| JP4006073B2 JP4006073B2 (en) | 2007-11-14 |
Family
ID=18488508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36711997A Expired - Fee Related JP4006073B2 (en) | 1997-12-25 | 1997-12-25 | Zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4006073B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001174704A (en) * | 1999-12-21 | 2001-06-29 | Olympus Optical Co Ltd | Zoom lens |
| JP2002341242A (en) * | 2001-05-21 | 2002-11-27 | Matsushita Electric Ind Co Ltd | Projection lens and projector using it |
| US6590716B2 (en) | 2001-04-27 | 2003-07-08 | Seiko Epson Corporation | Projection zoom lens |
| US6785055B2 (en) | 2001-05-23 | 2004-08-31 | Minolta Co. Ltd. | Zoom lens system |
| US6989939B2 (en) | 2003-08-11 | 2006-01-24 | Canon Kabushiki Kaisha | Variable-power optical system, projection optical system, and image projection apparatus using the systems |
| JP2007206331A (en) * | 2006-02-01 | 2007-08-16 | Canon Inc | Zoom lens and image projection apparatus having the same |
| JP2011069956A (en) * | 2009-09-25 | 2011-04-07 | Casio Computer Co Ltd | Zoom lens and projection type display device using the same |
| WO2016121955A1 (en) * | 2015-01-30 | 2016-08-04 | 株式会社ニコン | Zoom lens, optical apparatus, and zoom lens production method |
| CN106249379A (en) * | 2015-06-08 | 2016-12-21 | 富士胶片株式会社 | Imaging lens system and camera head |
| JP2019066730A (en) * | 2017-10-03 | 2019-04-25 | リコーインダストリアルソリューションズ株式会社 | Projection zoom lens and projection image display device |
| JPWO2019097717A1 (en) * | 2017-11-20 | 2020-10-22 | 株式会社ニコン | Magnification optics, optics, and methods of manufacturing variable magnification optics |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8503102B2 (en) | 2011-04-19 | 2013-08-06 | Panavision International, L.P. | Wide angle zoom lens |
-
1997
- 1997-12-25 JP JP36711997A patent/JP4006073B2/en not_active Expired - Fee Related
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001174704A (en) * | 1999-12-21 | 2001-06-29 | Olympus Optical Co Ltd | Zoom lens |
| US6590716B2 (en) | 2001-04-27 | 2003-07-08 | Seiko Epson Corporation | Projection zoom lens |
| JP2002341242A (en) * | 2001-05-21 | 2002-11-27 | Matsushita Electric Ind Co Ltd | Projection lens and projector using it |
| US6785055B2 (en) | 2001-05-23 | 2004-08-31 | Minolta Co. Ltd. | Zoom lens system |
| US6989939B2 (en) | 2003-08-11 | 2006-01-24 | Canon Kabushiki Kaisha | Variable-power optical system, projection optical system, and image projection apparatus using the systems |
| JP2007206331A (en) * | 2006-02-01 | 2007-08-16 | Canon Inc | Zoom lens and image projection apparatus having the same |
| JP2011069956A (en) * | 2009-09-25 | 2011-04-07 | Casio Computer Co Ltd | Zoom lens and projection type display device using the same |
| WO2016121955A1 (en) * | 2015-01-30 | 2016-08-04 | 株式会社ニコン | Zoom lens, optical apparatus, and zoom lens production method |
| US10908388B2 (en) | 2015-01-30 | 2021-02-02 | Nikon Corporation | Zoom lens, optical apparatus, and method for manufacturing zoom lens |
| US12169323B2 (en) | 2015-01-30 | 2024-12-17 | Nikon Corporation | Zoom lens, optical apparatus, and method for manufacturing zoom lens |
| JPWO2016121955A1 (en) * | 2015-01-30 | 2017-10-12 | 株式会社ニコン | Zoom lens, optical device, and method of manufacturing zoom lens |
| EP3252519A4 (en) * | 2015-01-30 | 2018-09-26 | Nikon Corporation | Zoom lens, optical apparatus, and zoom lens production method |
| US11668899B2 (en) | 2015-01-30 | 2023-06-06 | Nikon Corporation | Zoom lens, optical apparatus, and method for manufacturing zoom lens |
| US10379319B2 (en) | 2015-01-30 | 2019-08-13 | Nikon Corporation | Zoom lens, optical apparatus, and method for manufacturing zoom lens |
| JP2019148827A (en) * | 2015-01-30 | 2019-09-05 | 株式会社ニコン | Zoom lens and optical device |
| CN106249379A (en) * | 2015-06-08 | 2016-12-21 | 富士胶片株式会社 | Imaging lens system and camera head |
| JP2017003677A (en) * | 2015-06-08 | 2017-01-05 | 富士フイルム株式会社 | Image capturing lens and image capturing device |
| JP2019066730A (en) * | 2017-10-03 | 2019-04-25 | リコーインダストリアルソリューションズ株式会社 | Projection zoom lens and projection image display device |
| JPWO2019097717A1 (en) * | 2017-11-20 | 2020-10-22 | 株式会社ニコン | Magnification optics, optics, and methods of manufacturing variable magnification optics |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4006073B2 (en) | 2007-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5056900A (en) | Zoom lens | |
| US5111338A (en) | Zoom Lens | |
| JP3352240B2 (en) | High zoom ratio zoom lens | |
| JP3226297B2 (en) | Zoom lens and camera with zoom lens | |
| US5523888A (en) | Zoom lens | |
| JPH07253542A (en) | Zoom lens | |
| US5225937A (en) | Zoom lens | |
| JPH11190821A (en) | Zoom lens | |
| JP5295339B2 (en) | Zoom lens and imaging apparatus having the same | |
| JP4845458B2 (en) | Zoom lens and imaging apparatus having the same | |
| JPH07151975A (en) | Zoom lens | |
| JPH11352400A (en) | Zoom lens system | |
| JPH07151974A (en) | Zoom lens | |
| US4712883A (en) | Rear focus zoom lens | |
| JPH1048523A (en) | Zoom lens | |
| JPH0850245A (en) | Zoom lens | |
| JP3183047B2 (en) | Zoom lens | |
| JP2003315677A (en) | Zoom lens system that covers a wide angle | |
| JPH0743613A (en) | Zoom lens | |
| US6674580B2 (en) | Zoom lens and camera using the same | |
| JPH11174327A (en) | Zoom lens | |
| JP3186388B2 (en) | Zoom lens | |
| JPH04226411A (en) | Zoom lens of short overall length | |
| JPH08220436A (en) | Wide-angle zoom lens | |
| JPH11109232A (en) | Zoom lens system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20040318 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20050822 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20050830 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20051031 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20070306 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20070507 |
|
| A911 | Transfer of reconsideration by examiner before appeal (zenchi) |
Free format text: JAPANESE INTERMEDIATE CODE: A911 Effective date: 20070713 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20070807 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20070827 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100831 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110831 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120831 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120831 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130831 Year of fee payment: 6 |
|
| LAPS | Cancellation because of no payment of annual fees |