JPH08136802A - Changeover type variable power optical system - Google Patents
Changeover type variable power optical systemInfo
- Publication number
- JPH08136802A JPH08136802A JP6297867A JP29786794A JPH08136802A JP H08136802 A JPH08136802 A JP H08136802A JP 6297867 A JP6297867 A JP 6297867A JP 29786794 A JP29786794 A JP 29786794A JP H08136802 A JPH08136802 A JP H08136802A
- Authority
- JP
- Japan
- Prior art keywords
- lens system
- main lens
- lens
- lens group
- main
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
- G02B15/04—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by changing a part
- G02B15/06—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by changing a part by changing the front part
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
- G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は写真用カメラやビデオカ
メラ等に好適な切換え式変倍光学系に関し、特に主レン
ズ系の物体側と像面側に各々所定の屈折力のレンズ群を
挿脱可能に装着して変倍を行い第１撮影と第２撮影の２
つの撮影が選択可能となるようにし、かつ変倍における
レンズ系全体の明るさの変化が小さく、高変倍化が容易
で、しかも高性能の光学性能が容易に得られる切換え式
変倍光学系に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching type variable power optical system suitable for a photographic camera, a video camera or the like, and particularly, a lens unit having a predetermined refractive power is inserted on the object side and the image plane side of a main lens system. It is detachably attached and the magnification is changed to 2 for the first and second shooting.
Switching type variable magnification optical system that enables selection of two shootings, small change in brightness of the entire lens system during magnification change, easy high magnification change, and easy high performance optical performance. It is about.
【０００２】[0002]
【従来の技術】従来より主レンズ系の物体側若しくは像
界側に装着し全系の焦点面を一定位置に保持した状態で
全系の焦点距離を変化させる補助レンズ系、所謂コンバ
ーターレンズを利用した切換え式変倍光学系は種々提案
されている。切換え式変倍光学系として、コンバーター
レンズを正レンズ群と負レンズ群を組み合わせ、又は負
レンズ群と正レンズ群を組み合わせてアフォーカル系よ
り構成し、該コンバーターレンズを主レンズ系の物体側
に装着する所謂フロントコンバーター方法があり、例え
ば特開昭６２−８７９２３号公報で提案されている。2. Description of the Related Art Conventionally, an auxiliary lens system mounted on the object side or image field side of a main lens system and changing the focal length of the entire system while keeping the focal plane of the entire system at a fixed position, a so-called converter lens has been used. Various switchable variable power optical systems have been proposed. As a switching variable magnification optical system, a converter lens is composed of an afocal system by combining a positive lens group and a negative lens group, or by combining a negative lens group and a positive lens group, and the converter lens is arranged on the object side of the main lens system. There is a so-called front converter method of mounting, which is proposed in, for example, Japanese Patent Laid-Open No. 62-87923.
【０００３】またコンバーターレンズを正レンズ群又は
負レンズ群より構成し、主レンズ系の物体側に装着する
と同時に主レンズ系を光軸上移動させて像面を一定に維
持するようにした所謂リヤーコンバーター方法がある。
特開昭５９−２９２１４号公報では主レンズ系の後方に
正の屈折力のレンズ系を装着し、全系の焦点距離の短縮
化を図ったリヤーコンバーター方法を採用した切換え式
の変倍光学系を提案している。The converter lens is composed of a positive lens group or a negative lens group and is mounted on the object side of the main lens system, and at the same time, the main lens system is moved along the optical axis to keep the image plane constant, that is, a so-called rear lens. There is a converter method.
In Japanese Patent Laid-Open No. 59-29214, a switching type variable magnification optical system adopting a rear converter method in which a lens system having a positive refracting power is mounted behind the main lens system and the focal length of the entire system is shortened. Is proposed.
【０００４】[0004]
【発明が解決しようとする課題】フロントコンバーター
方法を用いた切換え式変倍光学系は装着するレンズ群の
レンズ構成にもよるが、変倍比は１．３〜２倍程度が限
界である。この方法では装着に際しては主レンズ系は光
軸上を移動させる必要はないが、レンズ系全体の明るさ
（Ｆナンバー）は主レンズ系が有する絞り径が不変のと
きは変倍しても変動しない。またこの方法は収差補正が
難しくなるばかりでなく、絞り位置が主レンズ系にある
ので装着するレンズ群による軸上色収差や倍率色収差の
発生が大きくなり、挿脱されるアフォーカルレンズ群の
設定が難しくなるという問題点があった。The switching type variable power optical system using the front converter method has a variable power ratio of about 1.3 to 2 depending on the lens configuration of the lens group to be mounted. With this method, it is not necessary to move the main lens system on the optical axis when mounting, but the brightness (F number) of the entire lens system fluctuates even if the magnification is changed when the aperture diameter of the main lens system does not change. do not do. Also, this method not only makes it difficult to correct aberrations, but also because the diaphragm position is on the main lens system, the generation of axial chromatic aberration and lateral chromatic aberration due to the lens group to be mounted is large, and the setting of the afocal lens group to be inserted and removed is difficult. There was a problem that it became difficult.
【０００５】またリヤーコンバーター方法を用いた切換
え式光学系は装着するレンズ群のレンズ構成にもよる
が、変倍比は２〜３倍程度が限界である。この方法では
レンズ群の装着に際し主レンズ系を光軸上を移動させる
必要があり、このため機構上複雑になる傾向がある。A switching type optical system using the rear converter method has a variable power ratio of about 2 to 3 depending on the lens configuration of the lens group to be mounted. In this method, it is necessary to move the main lens system on the optical axis when mounting the lens group, and this tends to make the mechanism complicated.
【０００６】またレンズ系全体の明るさ（Ｆナンバー）
は主レンズ系が有する絞り径が不変のときは変倍比分だ
け変動してしまう。このため広角側のＦナンバーをかな
り明るく設定しておかないと望遠側のＦナンバーが暗く
なるか、又は変倍比を小さく設定しなければならなくな
り、明るい高変倍比の光学系の達成が難しくなるという
問題点があった。The brightness of the entire lens system (F number)
When the diaphragm diameter of the main lens system is unchanged, the value fluctuates by the variable power ratio. Therefore, unless the F-number on the wide-angle side is set to be fairly bright, the F-number on the telephoto side will become dark, or the zoom ratio will have to be set small, and an optical system with a bright high zoom ratio can be achieved. There was a problem that it became difficult.
【０００７】本発明は主レンズ系の物体側及び像面側に
各々適切なる屈折力のレンズ群を挿脱可能に装着するこ
とにより撮影画角７０度以上の広角から３０度程度の画
角へと高い変倍比を有し、かつレンズ系全体の明るさの
変化が少なく、簡易な構成により焦点距離を容易に切換
えることができる切換え式変倍光学系の提供を目的とす
る。According to the present invention, a lens group having an appropriate refracting power is detachably mounted on the object side and the image plane side of the main lens system, thereby changing the shooting angle of view from a wide angle of 70 degrees or more to an angle of view of about 30 degrees. It is an object of the present invention to provide a switchable variable power optical system having a high zoom ratio, a small change in the brightness of the entire lens system, and a simple structure for easily switching the focal length.
【０００８】[0008]
【課題を解決するための手段】本発明の切換え式変倍光
学系は、主レンズ系による焦点距離ｆ１の第１撮影と、
該主レンズ系の物体側に負の屈折力のレンズ群Ｌａと該
主レンズ系の像面側に正の屈折力のレンズ群Ｌｂを装着
して焦点距離ｆ２の第２撮影の２つの撮影が選択してで
きるように構成したことを特徴としている。A switching type variable power optical system according to the present invention comprises: a first photographing with a focal length f1 by a main lens system;
By mounting a lens unit La having a negative refracting power on the object side of the main lens system and a lens unit Lb having a positive refracting power on the image plane side of the main lens system, two shootings of a second shooting at a focal length f2 are performed. It is characterized by being configured so that it can be selected.
【０００９】[0009]
【実施例】図１は本発明の近軸屈折力配置の説明図、図
２〜図５は本発明の数値実施例１〜４のレンズ断面図で
ある。図１〜図５において（Ａ）は第１撮影、（Ｂ）は
第２撮影の光学系を示している。1 is an explanatory view of a paraxial refractive power arrangement of the present invention, and FIGS. 2 to 5 are lens sectional views of numerical embodiments 1 to 4 of the present invention. 1 to 5, (A) shows an optical system for the first shooting, and (B) shows an optical system for the second shooting.
【００１０】図中、１は焦点距離ｆ１の主レンズ系であ
り、該主レンズ系１により第１撮影を行っている。Ｌａ
は負の屈折力のレンズ群Ｌａであり、主レンズ系１の物
体側に挿脱可能に装着している。Ｌｂは正の屈折力のレ
ンズ群Ｌｂであり、主レンズ系１の像面側に挿脱可能に
装着している。本実施例では、主レンズ系１の物体側に
レンズ群Ｌａを、又像面側にレンズ群Ｌｂを装着して、
焦点距離ｆ２の第２撮影を行っている。ＳＰは絞り、Ｉ
Ｐは像面である。Ｇはローパスフィルター等のガラスブ
ロックである。In the figure, reference numeral 1 denotes a main lens system having a focal length f1, and the main lens system 1 is used for the first photographing. La
Is a lens unit La having a negative refractive power, which is removably attached to the object side of the main lens system 1. Lb is a lens unit Lb having a positive refractive power, which is removably mounted on the image plane side of the main lens system 1. In this embodiment, the lens group La is attached to the object side of the main lens system 1 and the lens group Lb is attached to the image side,
The second shooting is performed at the focal length f2. SP is aperture, I
P is the image plane. G is a glass block such as a low-pass filter.
【００１１】図１〜図４に示す各実施例では、主レンズ
系１のみから成る焦点距離ｆ１の比較的撮影画角の狭い
（望遠型に近い）第１撮影と、主レンズ系１の物体側に
レンズ群Ｌａを像面側にレンズ群Ｌｂを各々挿脱可能に
挿着し、焦点距離ｆ２の撮影画角の広い第２撮影とを選
択して行っている。In each of the embodiments shown in FIGS. 1 to 4, the first photographing having a focal length f1 composed of only the main lens system 1 and having a relatively narrow photographing field angle (close to the telephoto type) and the object of the main lens system 1 The lens group La is attached to the side and the lens group Lb is attached to the side of the image surface so that the lens group Lb can be inserted and removed, and the second photography having a wide focal angle f2 and a wide field of view is selected.
【００１２】本実施例では第１撮影と第２撮影の全系の
焦点距離を各々ｆ１，ｆ２としたとき、 ｆ２＜ｆ１ ・・・・・・・ （１） となっている。In the present embodiment, when the focal lengths of the entire system for the first and second photographing are f1 and f2, respectively, f2 <f1 ... (1)
【００１３】負の屈折力のレンズ群Ｌａと正の屈折力の
レンズ群Ｌｂとの屈折力及び主レンズ系への挿着位置を
適切に設定して、第１撮影から第２撮影への変位に際し
て、主レンズ系が固定であっても像面ＩＰが変動しない
ようにしている。これによりレンズ鏡筒構造の簡素化を
図っている。By appropriately setting the refracting powers of the lens unit La having a negative refracting power and the lens unit Lb having a positive refracting power and the insertion position in the main lens system, the displacement from the first photographing to the second photographing At this time, even if the main lens system is fixed, the image plane IP does not change. This simplifies the lens barrel structure.
【００１４】そしてレンズ群Ｌａとレンズ群Ｌｂの焦点
距離を各々ｆａ，ｆｂとしたとき、 １＜｜ｆｂ／ｆａ｜＜１．５ ・・・・・・（２） となるようにしている。When the focal lengths of the lens group La and the lens group Lb are fa and fb, 1 <| fb / fa | <1.5 (2)
【００１５】条件式（２）の範囲を逸脱すると第１撮影
から第２撮影への変移に際して、主レンズ系を固定とし
鏡筒構造の簡素化を図るのが難しくなってくる。第２撮
影に際して、主レンズ系の結像倍率をβ１２、主レンズ
系の像面側に挿着するレンズ群Ｌｂの結像倍率をβｂ２
としたとき、 β１２＜０ ・・・・・・（３） ０＜βｂ２＜１ ・・・・・・（４） なる条件を満足するようにしている。If the range of conditional expression (2) is exceeded, it becomes difficult to fix the main lens system and simplify the lens barrel structure at the time of transition from the first photographing to the second photographing. At the time of the second photographing, the image forming magnification of the main lens system is β12, and the image forming magnification of the lens unit Lb attached to the image plane side of the main lens system is βb2.
Then, the condition of β12 <0 ... (3) 0 <βb2 <1 (4) is satisfied.
【００１６】条件式（３），（４）を逸脱すると第１撮
影から第２撮影への変移に際して主レンズ系を固定と
し、所定の変倍比を確保しつつ鏡筒構造の簡素化を図る
のが難しくなってくる。If the conditional expressions (3) and (4) are deviated, the main lens system is fixed during the transition from the first shooting to the second shooting, and the lens barrel structure is simplified while ensuring a predetermined zoom ratio. Becomes difficult.
【００１７】本発明において更に効率良く変倍を行うに
は、条件式（３），（４）の数値範囲を次の如く設定す
るのが良い。In order to carry out zooming more efficiently in the present invention, it is preferable to set the numerical ranges of conditional expressions (3) and (4) as follows.
【００１８】 −１．０＜β１２＜−０．５ ・・・・（３ａ） ０．２＜βｂ２＜０．６ ・・・・・・（４ａ） 本実施例において、フォーカスは主レンズ系を光軸上移
動させて行っている。尚、第２撮影のときはレンズ群Ｌ
ａ又は／及びレンズ群Ｌｂを用いて行っても良い。−1.0 <β12 <−0.5 (3a) 0.2 <βb2 <0.6 (4a) In the present embodiment, the focus is on the main lens system. It is moved on the optical axis. The lens group L is used during the second shooting.
You may perform using a or / and lens group Lb.
【００１９】次に本発明の切換え式変倍光学系の近軸屈
折力配置の特徴について図１（Ａ），（Ｂ）を用いて説
明する。Next, the characteristics of the paraxial refractive power arrangement of the switching type variable power optical system of the present invention will be described with reference to FIGS. 1 (A) and 1 (B).
【００２０】主レンズ系１、レンズ群Ｌａ、そしてレン
ズ群Ｌｂの焦点距離を順にｆ１，ｆａ，ｆｂ、レンズ群
Ｌａと主レンズ系１との主点間隔をｅ１、レンズ群Ｌｂ
と主レンズ系１との主点間隔をｅ２、無限遠物体のレン
ズ群Ｌａによる像点をＰ１、像点Ｐ１から主レンズ系１
までの距離をＬ２(-) 、物点（像点）Ｐ１の主レンズ系
１による像点をＰ２、主レンズ系１から像点Ｐ２までの
距離をＬ２′、レンズ群Ｌｂから像点Ｐ２までの距離を
Ｌ３、レンズ群Ｌｂから像面ＩＰまでの距離をＬ３′と
する。The focal lengths of the main lens system 1, the lens unit La, and the lens unit Lb are f1, fa, and fb, the principal point interval between the lens unit La and the main lens system 1 is e1, and the lens unit Lb.
And the main lens system 1 have a principal point interval of e2, an image point of the lens group La of an object at infinity is P1, and the main lens system 1 is from the image point P1.
To L2 (-), the image point of the object point (image point) P1 by the main lens system 1 is P2, the distance from the main lens system 1 to the image point P2 is L2 ', and the lens group Lb to the image point P2 Is L3, and the distance from the lens unit Lb to the image plane IP is L3 '.
【００２１】図１（Ｂ）の第２撮影時における主レンズ
系１とレンズ群Ｌｂの結像倍率β１２，βｂ２は各々、 β１２＝Ｌ２′／Ｌ２ ・・・・・・（５） βｂ２＝Ｌ３′／Ｌ３ ・・・・・・（６） となる。The image forming magnifications β12 and βb2 of the main lens system 1 and the lens unit Lb at the time of the second photographing of FIG. 1B are β12 = L2 ′ / L2 (5) βb2 = L3 ′ / L3 ··· (6)
【００２２】又ニュートンの式より、From Newton's equation,
【００２３】[0023]
【数１】 ここでｆａ＜０，Ｌ２＜０である。[Equation 1] Here, fa <0 and L2 <0.
【００２４】又、 ｜ｆａ｜＋ｅ１＝｜Ｌ２｜ ・・・・・・（９） ｅ２＋Ｌ３′＝ｆ１ ・・・・・・・・・・（１０） ｅ２＋Ｌ３ ＝Ｌ２′ ・・・・・・・・・・（１１） （８），（１０）式より、Further, | fa | + e1 = | L2 | ... (9) e2 + L3 '= f1 ........ (10) e2 + L3 = L2' ... ... (11) From equations (8) and (10),
【００２５】[0025]
【数２】 （７），（９），（１１），（１２）式より[Equation 2] From equations (7), (9), (11), and (12)
【００２６】[0026]
【数３】 本発明では（１３）式を満足するように諸定数ｆａ，ｆ
ｂ，ｅ１，ｅ２をｆ１に対して設定している。これによ
り図１（Ａ）の第１撮影から図１（Ｂ）の第２撮影への
変移に対してレンズ群Ｌａ，Ｌｂを挿着し、像面ＩＰを
一定とするとき主レンズ系１が固定となるようにしてい
る。尚、諸定数ｆａ，ｆｂ，ｅ１，ｅ２，ｆ１等は（１
３）式を完全に満足させなくてもピントずれが許容錯乱
円径δ内であれば良い。(Equation 3) In the present invention, the constants fa and f are set so as to satisfy the expression (13).
b, e1, e2 are set for f1. As a result, when the lens groups La and Lb are attached to the transition from the first shooting of FIG. 1A to the second shooting of FIG. 1B and the image plane IP is constant, the main lens system 1 is It is fixed. The constants fa, fb, e1, e2, f1 etc. are (1
Even if the expression (3) is not completely satisfied, it is sufficient that the focus shift is within the permissible circle of confusion diameter δ.
【００２７】例えばピントずれ量Δｘが錯乱円径δを撮
像面（イメージサークル）の1/200〜1/500 程度に設定
したとき、 Δｘ＜（Ｆナンバー）×δ を満足する範囲内に入っていれば良い。For example, when the focus deviation amount Δx is set to a confusion circle diameter δ of about 1/200 to 1/500 of the image pickup surface (image circle), it falls within the range satisfying Δx <(F number) × δ. Just go.
【００２８】本実施例ではレンズ群Ｌａ，Ｌｂの焦点距
離ｆａ，ｆｂが（１３）式を満足すれば良いが、更に
（２）式を満足するのが、第２撮影において良好なる光
学性能が容易に得られるので好ましい。本発明の目的と
する切換え式変倍光学系は以上の諸条件を満足すること
により達成しているが、更に好ましくは次の諸条件のう
ち少なくとも１つを満足させるのが良い。In the present embodiment, the focal lengths fa and fb of the lens groups La and Lb should satisfy the equation (13), but further satisfy the equation (2), which is to obtain good optical performance in the second photographing. It is preferable because it can be easily obtained. The switchable variable power optical system aimed at by the present invention is achieved by satisfying the above conditions, but it is more preferable to satisfy at least one of the following conditions.
【００２９】（１−１）主レンズ系とレンズ群Ｌａの焦
点距離ｆ１，ｆａが ｅ１＜｜ｆａ｜ ・・・・・・・・（１４） ｆ１＜ｅ２＋Ｌ３ ・・・・・・（１４ａ）を満足する
ことである。(1-1) The focal lengths f1 and fa of the main lens system and the lens group La are e1 <| fa | ... (14) f1 <e2 + L3 ..... (14a) Is to be satisfied.
【００３０】これによれば高い変倍比を有しつつ第１撮
影から第２撮影への変移を容易に行うことができる。According to this, it is possible to easily perform the transition from the first photographing to the second photographing while having a high zoom ratio.
【００３１】（１−２）本発明においては主レンズ系１
の光学系中又は物体側に絞りを設けるのが射出瞳の位置
を長くし、良好なる光学性能を容易に得ることができる
ので好ましい。(1-2) In the present invention, the main lens system 1
It is preferable to provide a stop in the optical system or on the object side because the position of the exit pupil can be lengthened and good optical performance can be easily obtained.
【００３２】（１−３）本発明においては図１（Ｂ）に
示す近軸屈折力配置において各要素を次の諸条件を満足
するように設定するのが良い。(1-3) In the present invention, in the paraxial refractive power arrangement shown in FIG. 1 (B), it is preferable to set each element so as to satisfy the following conditions.
【００３３】 −１．１ ＜ｆａ／ｆ１＜−０．６ ・・・・・・（１５） ０．９ ＜ｆｂ／ｆ１＜ １．５ ・・・・・・（１６） −１．５ ＜ｅ１／ｆａ＜−０．９ ・・・・・・（１７） ０．１５＜ｅ２／ｆ１＜ ０．３ ・・・・・・（１８） ０．１ ＜ｅ２／ｆｂ＜ ０．３ ・・・・・・（１９） 条件式（１５）〜（１９）は条件式（１３）を満足させ
るために充分なものであるが、これらの条件式を逸脱す
るとレンズ群Ｌａ，Ｌｂを所定の空間内に挿脱して、高
い変倍比を有しレンズ系全体の小型化を図りつつ第１撮
影から第２撮影へと良好なる光学性能を維持しつつ変移
させるのが難しくなってくる。-1.1 <fa / f1 <-0.6 (15) 0.9 <fb / f1 <1.5 (16) -1.5 < e1 / fa <-0.9 ··· (17) 0.15 <e2 / f1 <0.3 ··· (18) 0.1 <e2 / fb <0.3 ··· (19) Conditional expressions (15) to (19) are sufficient to satisfy the conditional expression (13), but if these conditional expressions are deviated, the lens groups La and Lb are separated by a predetermined space. It becomes difficult to make a change from the first shooting to the second shooting while maintaining good optical performance while inserting / removing the lens and having a high zoom ratio to reduce the size of the entire lens system.
【００３４】（１−４）主レンズ系のバックフォーカス
（空気中換算であり、ローパスフィルター等のガラス材
を除いた長さ）をＳ１としたとき、 ０．７＜Ｓ１／ｆ１＜１．３ ・・・・・・（２０） なる条件を満足することである。(1-4) 0.7 <S1 / f1 <1.3 where S1 is the back focus of the main lens system (length in air, excluding glass material such as low-pass filter) ··· (20) To satisfy the following condition.
【００３５】条件式（２０）は変倍に際して主レンズ系
を固定とし、レンズ群Ｌｂを挿着するために必要なバッ
クフォーカスを得るためのものである。条件式（２０）
の下限値を越えるとレンズ群Ｌｂを挿着する際の空間が
少なくなってくる。また上限値を越えて焦点距離ｆ１が
短くなると主レンズ系がレトロフォーカスタイプに近く
なり、変倍比を大きくするのが難しくなってくる。Conditional expression (20) is for obtaining the back focus required for inserting and mounting the lens unit Lb with the main lens system fixed during zooming. Conditional expression (20)
If the lower limit of is exceeded, the space for inserting and mounting the lens unit Lb becomes smaller. If the focal length f1 is shortened beyond the upper limit, the main lens system becomes close to a retrofocus type, and it becomes difficult to increase the zoom ratio.
【００３６】（１−５）レンズ群Ｌａを物体側に凸面を
向けたメニスカス状の単一の負レンズより構成し、レン
ズ群Ｌｂを物体側に凸面を向けた単一の正レンズより構
成することである。これによればレンズ系全体の簡素化
を図りつつ、第１撮影から第２撮影への変移を良好に行
うことができる。(1-5) The lens unit La is composed of a single negative meniscus lens whose convex surface faces the object side, and the lens unit Lb is composed of a single positive lens whose convex surface faces the object side. That is. According to this, it is possible to favorably perform the transition from the first shooting to the second shooting while simplifying the entire lens system.
【００３７】（１−６）主レンズ系を両レンズ面が凸面
の正レンズ、絞り、両レンズ面が凹面の負レンズそして
両レンズ面が凸面の正レンズより構成することである。
これによれば第１撮影と第２撮影での光学性能をバラン
ス良く維持することが容易となる。(1-6) The main lens system is composed of a positive lens whose both lens surfaces are convex surfaces, a diaphragm, a negative lens whose both lens surfaces are concave surfaces, and a positive lens whose both lens surfaces are convex surfaces.
According to this, it becomes easy to maintain the optical performance in the first shooting and the second shooting in good balance.
【００３８】（１−７）レンズ群Ｌａの第２面に、レン
ズ中心からレンズ周辺にいくに従い負の屈折力が弱くな
る形状の非球面、又はレンズ周辺部で正の屈折力が強く
なる形状の非球面を用いるのが良い。これによれば第２
撮影のとき、負の歪曲収差を良好に補正することができ
る。(1-7) On the second surface of the lens unit La, an aspherical surface having a shape in which the negative refracting power becomes weaker from the lens center to the lens periphery, or a shape in which the positive refracting power becomes stronger at the lens peripheral portion. It is better to use the aspherical surface of. According to this second
At the time of shooting, negative distortion can be corrected well.
【００３９】（１−８）主レンズ系の一部にレンズ中心
からレンズ周辺にいくに従い正の屈折力が弱くなる形状
の非球面を用いるのが良い。又はレンズ周辺部で負の屈
折力が強くなる非球面を用いるのが良い。これによれば
主レンズ系から発生する球面収差とコマ収差をバランス
良く補正することができる。(1-8) It is preferable to use an aspherical surface having a shape in which the positive refracting power becomes weaker from the lens center to the lens periphery as a part of the main lens system. Alternatively, it is preferable to use an aspherical surface having a strong negative refracting power in the peripheral portion of the lens. According to this, the spherical aberration and the coma aberration generated from the main lens system can be corrected in good balance.
【００４０】次に本発明の数値実施例を示す。数値実施
例においてＲｉは物体側より順に第ｉ番目のレンズ面の
曲率半径、Ｄｉは物体側より第ｉ番目のレンズ厚及び空
気間隔、Ｎｉとνｉは各々物体側より順に第ｉ番目のレ
ンズのガラスの屈折率とアッベ数である。Next, numerical examples of the present invention will be shown. In the numerical examples, Ri is the radius of curvature of the i-th lens surface in order from the object side, Di is the i-th lens thickness and air gap from the object side, and Ni and νi are respectively from the object side of the i-th lens. The refractive index of glass and the Abbe number.
【００４１】又前述の各条件式と数値実施例における諸
数値との関係を表−１に示す。Table 1 shows the relationship between the above-mentioned conditional expressions and various numerical values in the numerical examples.
【００４２】非球面形状は光軸方向にＸ軸、光軸と垂直
方向にＨ軸、光の進行方向を正としＲを近軸曲率半径、
Ａ，Ｂ，Ｃ，Ｄ，Ｅを各々非球面係数としたとき、The aspherical shape has an X axis in the optical axis direction, an H axis in the direction perpendicular to the optical axis, a positive light traveling direction, and R as a paraxial radius of curvature,
When A, B, C, D and E are aspherical coefficients,
【００４３】[0043]
【数４】 なる式で表わしている。又、「Ｄ−Ｘ」は「１０-X」を
意味している。 （数値実施例１） 第１撮影（主レンズ系） f= 2.95 fno= 1:4.0 2ω= 29.5° R 1= 2.612 D 1= 0.40 N 1=1.77250 ν 1= 49.6 R 2= -6.110 D 2= 0.22 R 3= (絞リ) D 3= 0.21 R 4= -1.193 D 4= 0.37 N 2=1.60342 ν 2= 38.0 R 5= 1.035 D 5= 0.07 R 6= 1.700 D 6= 0.84 N 3=1.60311 ν 3= 60.7 R 7= -1.087 D 7=(1.22) R 8= ∞ D 8= 1.22 N 4=1.51633 ν 4= 64.2 R 9= ∞ 第２撮影（レンズ群Ｌａ＋主レンズ系＋レンズ群Ｌｂ） f= 1.00 fno= 1:2.8 2ω= 76.0° R 1= 6.993 D 1= 0.24 N 1=1.58313 ν 1= 59.4 R 2= 1.326 D 2= 2.29 R 3= 2.612 D 3= 0.40 N 2=1.77250 ν 2= 49.6 R 4= -6.110 D 4= 0.22 R 5= (絞リ) D 5= 0.21 R 6= -1.193 D 6= 0.37 N 3=1.60342 ν 3= 38.0 R 7= 1.035 D 7= 0.07 R 8= 1.700 D 8= 0.84 N 4=1.60311 ν 4= 60.7 R 9= -1.087 D 9= 0.05 R10= 3.804 D10= 0.62 N 5=1.60311 ν 5= 60.7 R11= -5.189 D11=(0.24) R12= ∞ D12= 1.22 N 6=1.51633 ν 6= 64.2 R13= ∞ 第２面 非球面 K =-2.716D-05 A2=-4.745D-02 A3=-2.142D-02 A4=-6.919D-04 A5=-3.035D-05 （数値実施例２） 第１撮影（主レンズ系） f= 2.76 fno= 1:4.0 2ω= 30.0° R 1= 2.202 D 1= 0.37 N 1=1.85026 ν 1= 32.3 R 2= -7.610 D 2= 0.18 R 3= (絞リ) D 3= 0.21 R 4= -1.069 D 4= 0.39 N 2=1.84666 ν 2= 23.8 R 5= 1.527 D 5= 0.04 R 6= 2.262 D 6= 0.51 N 3=1.77250 ν 3= 49.6 R 7= -1.074 D 7=(1.17) R 8= ∞ D 8= 1.17 N 4=1.51633 ν 4= 64.2 R 9= ∞ 第２撮影（レンズ群Ｌａ＋主レンズ系＋レンズ群Ｌｂ） f= 1.00 fno= 1:2.85 2ω= 73.5° R 1= 4.819 D 1= 0.23 N 1=1.58313 ν 1= 59.4 R 2= 1.175 D 2= 1.96 R 3= 2.202 D 3= 0.37 N 2=1.85026 ν 2= 32.3 R 4= -7.610 D 4= 0.18 R 5= (絞リ) D 5= 0.21 R 6= -1.069 D 6= 0.39 N 3=1.84666 ν 3= 23.8 R 7= 1.527 D 7= 0.04 R 8= 2.262 D 8= 0.51 N 4=1.77250 ν 4= 49.6 R 9= -1.074 D 9= 0.04 R10= 2.988 D10= 0.56 N 5=1.77250 ν 5= 49.6 R11= -12.953 D11=(0.23) R12= ∞ D12= 1.17 N 6=1.51633 ν 6= 64.2 R13= ∞ 第２面 非球面 K =-3.912D-04 A2=-4.940D-02 A3=-2.434D-02 A4=-9.298D-03 A5=-8.683D-03 （数値実施例３） 第１撮影（主レンズ系） f= 2.79 fno= 1:4.0 2ω= 30.0° R 1= 2.131 D 1= 0.36 N 1=1.83400 ν 1= 37.2 R 2= -8.997 D 2= 0.18 R 3= (絞リ) D 3= 0.23 R 4= -1.078 D 4= 0.40 N 2=1.84666 ν 2= 23.8 R 5= 1.546 D 5= 0.04 R 6= 2.242 D 6= 0.49 N 3=1.77250 ν 3= 49.6 R 7= -1.077 D 7=(1.17) R 8= ∞ D 8= 1.17 N 4=1.51633 ν 4= 64.2 R 9= ∞ 第２撮影（レンズ群Ｌａ＋主レンズ系＋レンズ群Ｌｂ） f= 1.00 fno= 1:2.85 2ω= 74.0° R 1= 4.237 D 1= 0.23 N 1=1.58313 ν 1= 59.4 R 2= 1.098 D 2= 1.98 R 3= 2.131 D 3= 0.36 N 2=1.83400 ν 2= 37.2 R 4= -8.997 D 4= 0.18 R 5= (絞リ) D 5= 0.23 R 6= -1.078 D 6= 0.40 N 3=1.84666 ν 3= 23.8 R 7= 1.546 D 7= 0.04 R 8= 2.242 D 8= 0.49 N 4=1.77250 ν 4= 49.6 R 9= -1.077 D 9= 0.03 R10= 2.547 D10= 0.55 N 5=1.77250 ν 5= 49.6 R11=9252.482 D11=(0.23) R12= ∞ D12= 1.17 N 6=1.51633 ν 6= 64.2 R13= ∞ 第２面 非球面 K =-3.640D-03 A2=-6.647D-02 A3=-1.017D-02 A4=-2.297D-02 A5=-2.605D-02 （数値実施例４） 第１撮影（主レンズ系） f= 2.87 fno= 1:4.0 2ω= 30.0° R 1= (絞リ) D 1= 0.07 R 2= 1.911 D 2= 0.37 N 1=1.83400 ν 1= 37.2 R 3= -27.553 D 3= 0.38 R 4= -1.162 D 4= 0.36 N 2=1.84666 ν 2= 23.8 R 5= 1.671 D 5= 0.04 R 6= 2.506 D 6= 0.49 N 3=1.77250 ν 3= 49.6 R 7= -1.137 D 7=(1.20) R 8= ∞ D 8= 1.20 N 4=1.51633 ν 4= 64.2 R 9= ∞ 第２撮影（レンズ群Ｌａ＋主レンズ系＋レンズ群Ｌｂ） f= 1.00 fno= 1:3.00 2ω= 75.0° R 1= 4.591 D 1= 0.24 N 1=1.58313 ν 1= 59.4 R 2= 1.176 D 2= 2.61 R 3= (絞リ) D 3= 0.07 R 4= 1.911 D 4= 0.37 N 2=1.83400 ν 2= 37.2 R 5= -27.553 D 5= 0.38 R 6= -1.162 D 6= 0.36 N 3=1.84666 ν 3= 23.8 R 7= 1.671 D 7= 0.04 R 8= 2.506 D 8= 0.49 N 4=1.77250 ν 4= 49.6 R 9= -1.137 D 9= 0.05 R10= 2.464 D10= 0.39 N 5=1.77250 ν 5= 49.6 R11= 14.516 D11=(0.24) R12= ∞ D12= 1.20 N 6=1.51633 ν 6= 64.2 R13= ∞ 第２面 非球面 K =-3.702D-03 A2=-5.074D-02 A3= 3.100D-03 A4=-1.893D-02 A5=-2.035D-02[Equation 4] It is expressed by Further, “D-X” means “10 −X ”. (Numerical Example 1) First shooting (main lens system) f = 2.95 fno = 1: 4.0 2ω = 29.5 ° R 1 = 2.612 D 1 = 0.40 N 1 = 1.77250 ν 1 = 49.6 R 2 = -6.110 D 2 = 0.22 R 3 = (restricted) D 3 = 0.21 R 4 = -1.193 D 4 = 0.37 N 2 = 1.60342 ν 2 = 38.0 R 5 = 1.035 D 5 = 0.07 R 6 = 1.700 D 6 = 0.84 N 3 = 1.60311 ν 3 = 60.7 R 7 = -1.087 D 7 = (1.22) R 8 = ∞ D 8 = 1.22 N 4 = 1.51633 ν 4 = 64.2 R 9 = ∞ Second shooting (lens group La + main lens system + lens group Lb) f = 1.00 fno = 1: 2.8 2ω = 76.0 ° R 1 = 6.993 D 1 = 0.24 N 1 = 1.58313 ν 1 = 59.4 R 2 = 1.326 D 2 = 2.29 R 3 = 2.612 D 3 = 0.40 N 2 = 1.77250 ν 2 = 49.6 R 4 = -6.110 D 4 = 0.22 R 5 = (restricted) D 5 = 0.21 R 6 = -1.193 D 6 = 0.37 N 3 = 1.60342 ν 3 = 38.0 R 7 = 1.035 D 7 = 0.07 R 8 = 1.700 D 8 = 0.84 N 4 = 1.60311 ν 4 = 60.7 R 9 = -1.087 D 9 = 0.05 R10 = 3.804 D10 = 0.62 N 5 = 1.60311 ν 5 = 60.7 R11 = -5.189 D11 = (0.24) R12 = ∞ D12 = 1.22 N 6 = 1.51633 ν 6 = 64.2 R13 = ∞ 2nd surface Aspheric surface K = -2.716D-05 A 2 = -4.745D-02 A 3 = -2.142D-02 A 4 = -6.919D-04 A 5 = -3.035D-05 (Numerical example 2) 1 shooting (main lens system) f = 2.76 fno = 1: 4.0 2ω = 30.0 ° R 1 = 2.202 D 1 = 0.37 N 1 = 1.85026 ν 1 = 32.3 R 2 = -7.610 D 2 = 0.18 R 3 = ) D 3 = 0.21 R 4 = -1.069 D 4 = 0.39 N 2 = 1.84666 ν 2 = 23.8 R 5 = 1.527 D 5 = 0.04 R 6 = 2.262 D 6 = 0.51 N 3 = 1.77250 ν 3 = 49.6 R 7 =- 1.074 D 7 = (1.17) R 8 = ∞ D 8 = 1.17 N 4 = 1.51633 ν 4 = 64.2 R 9 = ∞ Second shooting (lens group La + main lens system + lens group Lb) f = 1.00 fno = 1: 2.85 2ω = 73.5 ° R 1 = 4.819 D 1 = 0.23 N 1 = 1.58313 ν 1 = 59.4 R 2 = 1.175 D 2 = 1.96 R 3 = 2.202 D 3 = 0.37 N 2 = 1.85026 ν 2 = 32.3 R 4 = -7.610 D 4 = 0.18 R 5 = (restricted) D 5 = 0.21 R 6 = -1.069 D 6 = 0.39 N 3 = 1.84666 ν 3 = 23.8 R 7 = 1.527 D 7 = 0.04 R 8 = 2.262 D 8 = 0.51 N 4 = 1.77250 ν 4 = 49.6 R 9 = -1.074 D 9 = 0.04 R10 = 2.988 D10 = 0.56 N 5 = 1.77250 ν 5 = 49.6 R11 = -12.953 D11 = (0.23) R12 = ∞ D12 = 1.17 N 6 = 1.51633 ν 6 = 64.2 R13 = ∞ 2nd surface Aspheric surface K = -3.912D-04 A 2 = -4.940D-02 A 3 = -2.434D-02 A 4 = -9.298D-03 A 5 = -8.683D-03 (numerical value Example 3) First shooting (Main lens) F) 2.79 fno = 1: 4.0 2 ω = 30.0 ° R 1 = 2.131 D 1 = 0.36 N 1 = 1.83400 ν 1 = 37.2 R 2 = -8.997 D 2 = 0.18 R 3 = (aperture) D 3 = 0.23 R 4 = -1.078 D 4 = 0.40 N 2 = 1.84666 ν 2 = 23.8 R 5 = 1.546 D 5 = 0.04 R 6 = 2.242 D 6 = 0.49 N 3 = 1.77250 ν 3 = 49.6 R 7 = -1.077 D 7 = ( 1.17) R 8 = ∞ D 8 = 1.17 N 4 = 1.51633 ν 4 = 64.2 R 9 = ∞ Second shooting (lens group La + main lens system + lens group Lb) f = 1.00 fno = 1: 2.85 2ω = 74.0 ° R 1 = 4.237 D 1 = 0.23 N 1 = 1.58313 ν 1 = 59.4 R 2 = 1.098 D 2 = 1.98 R 3 = 2.131 D 3 = 0.36 N 2 = 1.83400 ν 2 = 37.2 R 4 = -8.997 D 4 = 0.18 R 5 = (Restricted) D 5 = 0.23 R 6 = -1.078 D 6 = 0.40 N 3 = 1.84666 ν 3 = 23.8 R 7 = 1.546 D 7 = 0.04 R 8 = 2.242 D 8 = 0.49 N 4 = 1.77250 ν 4 = 49.6 R 9 = -1.077 D 9 = 0.03 R10 = 2.547 D10 = 0.55 N 5 = 1.77250 ν 5 = 49.6 R11 = 9252.482 D11 = (0.23) R12 = ∞ D12 = 1.17 N 6 = 1.51633 ν 6 = 64.2 R13 = ∞ 2nd Surface Aspheric surface K = -3.640D-03 A 2 = -6.647D-02 A 3 = -1.017D-02 A 4 = -2.297D-02 A 5 = -2.605D-02 (Numerical Example 4) 1st Shooting (main lens system) f = 2.87 fno = 1: 4.0 2 ω = 30.0 ° R 1 = (Aperture) D 1 = 0.07 R 2 = 1.911 D 2 = 0.37 N 1 = 1.83400 ν 1 = 37.2 R 3 = -27.553 D 3 = 0.38 R 4 = -1.162 D 4 = 0.36 N 2 = 1.84666 ν 2 = 23.8 R 5 = 1.671 D 5 = 0.04 R 6 = 2.506 D 6 = 0.49 N 3 = 1.77250 ν 3 = 49.6 R 7 = -1.137 D 7 = (1.20) R 8 = ∞ D 8 = 1.20 N 4 = 1.51633 ν 4 = 64.2 R 9 = ∞ Second shooting (lens group La + main lens system + lens group Lb) f = 1.00 fno = 1: 3.00 2 ω = 75.0 ° R 1 = 4.591 D 1 = 0.24 N 1 = 1.58313 ν 1 = 59.4 R 2 = 1.176 D 2 = 2.61 R 3 = (Aperture) D 3 = 0.07 R 4 = 1.911 D 4 = 0.37 N 2 = 1.83400 ν 2 = 37.2 R 5 = -27.553 D 5 = 0.38 R 6 = -1.162 D 6 = 0.36 N 3 = 1.84666 ν 3 = 23.8 R 7 = 1.671 D 7 = 0.04 R 8 = 2.506 D 8 = 0.49 N 4 = 1.77250 ν 4 = 49.6 R 9 = -1.137 D 9 = 0.05 R10 = 2.464 D10 = 0.39 N 5 = 1.77250 ν 5 = 49.6 R11 = 14.516 D11 = (0.24) R12 = ∞ D12 = 1.20 N 6 = 1.51633 ν 6 = 64.2 R13 = ∞ 2nd surface Aspheric surface K = -3.702D- 03 A 2 = -5.074D-02 A 3 = 3.100D-03 A 4 = -1.893D-02 A 5 = -2.035D-02
【００４４】[0044]
【表１】 [Table 1]
【００４５】[0045]
【発明の効果】本発明によれば以上のように、主レンズ
系の物体側及び像面側に各々適切なる屈折力のレンズ群
を挿脱可能に装着することにより撮影画角７０度以上の
広角から３０度程度の画角へと高い変倍比を有し、かつ
レンズ系全体の明るさの変化が少なく、簡易な構成によ
り焦点距離を容易に切換えることができる切換え式変倍
光学系を達成することができる。As described above, according to the present invention, a lens group having an appropriate refracting power is detachably mounted on the object side and the image plane side of the main lens system so that a photographing field angle of 70 degrees or more can be obtained. A switching variable power optical system that has a high zoom ratio from a wide angle to about 30 degrees, has little change in the brightness of the entire lens system, and can easily switch the focal length with a simple configuration. Can be achieved.
【図１】 本発明の近軸屈折力配置の説明図FIG. 1 is an explanatory view of a paraxial refractive power arrangement according to the present invention.
【図２】 本発明の数値実施例１のレンズ断面図FIG. 2 is a lens cross-sectional view of Numerical Example 1 of the present invention.
【図３】 本発明の数値実施例２のレンズ断面図FIG. 3 is a lens cross-sectional view of Numerical Example 2 of the present invention.
【図４】 本発明の数値実施例３のレンズ断面図FIG. 4 is a lens sectional view of Numerical Example 3 of the present invention.
【図５】 本発明の数値実施例４のレンズ断面図FIG. 5 is a lens cross-sectional view of Numerical Example 4 of the present invention.
【図６】 本発明の数値実施例１の第１撮影の収差図FIG. 6 is an aberration diagram of first imaging according to Numerical Example 1 of the present invention.
【図７】 本発明の数値実施例１の第２撮影の収差図FIG. 7 is an aberration diagram of second imaging according to Numerical Example 1 of the present invention.
【図８】 本発明の数値実施例２の第１撮影の収差図FIG. 8 is an aberration diagram of first imaging according to Numerical Example 2 of the present invention.
【図９】 本発明の数値実施例２の第２撮影の収差図FIG. 9 is an aberration diagram of second imaging according to Numerical Example 2 of the present invention.
【図１０】 本発明の数値実施例３の第１撮影の収差図FIG. 10 is an aberration diagram of first imaging according to Numerical Example 3 of the present invention.
【図１１】 本発明の数値実施例３の第２撮影の収差図FIG. 11 is an aberration diagram of second imaging according to Numerical Example 3 of the present invention.
【図１２】 本発明の数値実施例４の第１撮影の収差図FIG. 12 is an aberration diagram of first imaging according to Numerical Example 4 of the present invention.
【図１３】 本発明の数値実施例４の第２撮影の収差図FIG. 13 is an aberration diagram of second imaging according to Numerical Example 4 of the present invention.
１ 主レンズ系 Ｌａ レンズ群Ｌａ Ｌｂ レンズ群Ｌｂ ＳＰ 絞り ＩＰ 像面 Ｇ ガラスブロック ｄ ｄ線 ｇ ｇ線 ΔＳ サジタル像面 ΔＭ メリディオナル像面 1 Main lens system La Lens group La Lb Lens group Lb SP Aperture IP Image surface G Glass block d d line g g line ΔS Sagittal image surface ΔM Meridional image surface
Claims (3)
影と、該主レンズ系の物体側に負の屈折力のレンズ群Ｌ
ａと該主レンズ系の像面側に正の屈折力のレンズ群Ｌｂ
を装着して焦点距離ｆ２の第２撮影の２つの撮影が選択
してできるように構成したことを特徴とする切換え式変
倍光学系。1. A first photographing with a focal length f1 by a main lens system and a lens unit L having a negative refractive power on the object side of the main lens system.
a and a lens unit Lb having a positive refractive power on the image plane side of the main lens system
The variable magnification optical system of the switching type, characterized in that it is configured such that the two images of the second image having the focal length f2 can be selected and attached by mounting.
への変移に際し、固定であることを特徴とする請求項１
の切換え式変倍光学系。2. The main lens system is fixed during the transition from the first photographing to the second photographing.
Switchable variable magnification optical system.
距離を各々ｆａ，ｆｂとしたとき、 １＜｜ｆｂ／ｆａ｜＜１．５ なる条件を満足することを特徴とする請求項１の切換え
式変倍光学系。3. When the focal lengths of the lens unit La and the lens unit Lb are fa and fb, respectively, the condition 1 <| fb / fa | <1.5 is satisfied. Switchable variable magnification optical system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6297867A JPH08136802A (en) | 1994-11-07 | 1994-11-07 | Changeover type variable power optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6297867A JPH08136802A (en) | 1994-11-07 | 1994-11-07 | Changeover type variable power optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08136802A true JPH08136802A (en) | 1996-05-31 |
Family
ID=17852167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6297867A Pending JPH08136802A (en) | 1994-11-07 | 1994-11-07 | Changeover type variable power optical system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08136802A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006251412A (en) * | 2005-03-11 | 2006-09-21 | Nidec Copal Corp | Lens for observation |
| JP2010107606A (en) * | 2008-10-29 | 2010-05-13 | Fujinon Corp | Imaging lens and imaging apparatus |
| JP2021139976A (en) * | 2020-03-03 | 2021-09-16 | キヤノン株式会社 | Attachment optical system, optical system, and method for manufacturing optical system |
-
1994
- 1994-11-07 JP JP6297867A patent/JPH08136802A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006251412A (en) * | 2005-03-11 | 2006-09-21 | Nidec Copal Corp | Lens for observation |
| JP2010107606A (en) * | 2008-10-29 | 2010-05-13 | Fujinon Corp | Imaging lens and imaging apparatus |
| JP2021139976A (en) * | 2020-03-03 | 2021-09-16 | キヤノン株式会社 | Attachment optical system, optical system, and method for manufacturing optical system |
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