JPH09133858A - Image pickup lens system - Google Patents
Image pickup lens systemInfo
- Publication number
- JPH09133858A JPH09133858A JP7315799A JP31579995A JPH09133858A JP H09133858 A JPH09133858 A JP H09133858A JP 7315799 A JP7315799 A JP 7315799A JP 31579995 A JP31579995 A JP 31579995A JP H09133858 A JPH09133858 A JP H09133858A
- Authority
- JP
- Japan
- Prior art keywords
- afocal
- imaging lens
- lens system
- lens
- image pickup
- 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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
-
- 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
- G02B15/144—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 four groups only
- G02B15/1441—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 four groups only the first group being positive
- G02B15/144113—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 four groups only the first group being positive arranged +-++
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は新規な撮像レンズ系
に関する。詳しくは、主に、ビデオカメラの撮影用レン
ズ系として用いられる撮像レンズ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 novel image pickup lens system. Specifically, the present invention mainly relates to an imaging lens system used as a shooting lens system of a video camera.
【０００２】[0002]
【従来の技術】近年、ビデオカメラは小型化が必須の要
件となっている。そして、撮像レンズ系、特にビデオカ
メラ用の撮像レンズ系の小型化によって、ビデオカメラ
は小型化することができたといっても過言ではない。2. Description of the Related Art In recent years, miniaturization of video cameras has become an essential requirement. It is no exaggeration to say that the video camera can be downsized by downsizing the imaging lens system, particularly the imaging lens system for a video camera.
【０００３】即ち、撮像レンズ系の小型化において、撮
像素子として用いられている固体撮像素子（ＣＣＤ）の
イメージャサイズの小型化や、例えば、特開昭６２−２
４２１３号に開示されているようなインナーフォーカス
レンズ、特開平３−３３７１０号に開示されている非球
面レンズの活用によるレンズ構成枚数の削減等がこれに
大きく貢献しているものと思われる。That is, in the downsizing of the image pickup lens system, the imager size of a solid-state image pickup device (CCD) used as an image pickup device is downsized, and, for example, Japanese Patent Laid-Open No. 62-2.
The inner focus lens disclosed in Japanese Patent No. 4213 and the reduction of the number of lens components by utilizing the aspherical lens disclosed in Japanese Patent Laid-Open No. 3-33710 are considered to make a great contribution to this.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記し
たような従来のビデオカメラの撮像レンズ系にあって
は、物体側から撮像面側まで延びる光軸が一直線となる
ように撮像レンズ系の構成要素であるレンズが配置され
ており、そして、上記撮像レンズ系の光軸が水平になる
ように撮像レンズ系を配置することによってビデオカメ
ラは構成されている。However, in the image pickup lens system of the conventional video camera as described above, the components of the image pickup lens system are arranged so that the optical axis extending from the object side to the image pickup surface side becomes a straight line. And the image pickup lens system is arranged so that the optical axis of the image pickup lens system is horizontal.
【０００５】ところで、ビデオカメラは撮像レンズ系以
外にもメカデッキ部、ビューファインダー部、マイク、
基板等多くの部品から構成され、前記したように、光軸
が一直線となるようにレンズが配置された撮像レンズ系
においては、撮像レンズ系が小型化したことを考慮に入
れても、ビデオカメラ内で撮像レンズ系を水平に配置し
なければならないという制約の為撮像レンズ系の配置が
制限され、ビデオカメラを小型化する上での障害となっ
たり、デザイン上の制約を与えるものとなっている。By the way, in addition to the imaging lens system, the video camera has a mechanical deck section, a viewfinder section, a microphone,
In an imaging lens system that is composed of many components such as a board and has the lens arranged so that the optical axis is aligned as described above, a video camera can be used even if the size of the imaging lens system is taken into consideration. Due to the restriction that the imaging lens system must be horizontally arranged inside, the arrangement of the imaging lens system is restricted, which becomes an obstacle to downsizing the video camera and gives a design restriction. There is.
【０００６】そこで、単純に考えれば、撮像レンズ系の
光軸を折り曲げればよいことになるが、従来のレンズ構
成のままでは、量産時における製造誤差による結像性能
の劣化を克服することができず、これを実現することが
困難であった。Therefore, if simply considered, the optical axis of the image pickup lens system may be bent, but with the conventional lens configuration, the deterioration of the imaging performance due to the manufacturing error during mass production can be overcome. This was not possible and it was difficult to achieve this.
【０００７】[0007]
【課題を解決するための手段】本発明撮像レンズ系は、
以上のような問題点に鑑み、物体側よりアフォーカル
部、結像レンズ部で構成される撮像レンズ系において、
アフォーカル部を構成する正と負の２つのレンズ群の間
に反射部材を配置し、該反射部材によって物体側からの
光軸と像面における光軸とが折れ曲がるようにしたもの
である。The image pickup lens system of the present invention comprises:
In view of the above problems, in the imaging lens system including the afocal part and the imaging lens part from the object side,
A reflecting member is arranged between two positive and negative lens units that form the afocal portion, and the reflecting member bends the optical axis from the object side and the optical axis on the image plane.
【０００８】従って、本発明撮像レンズ系にあっては、
アフォーカル部を構成する正と負の２つのレンズ群の間
に反射部材を配置するようにして光軸が折れ曲がる箇所
を最も物体側になるようにしたので、光軸を折り曲げる
箇所と結像レンズ部との位置ずれ精度の許容範囲が大き
くなって、製造時の誤差による結像性能の劣化を低減す
ることができ、更に、光軸を折り曲げる箇所のスペース
の確保が容易となり、ビデオカメラの小型化への制約や
デザイン上の制約のない撮像レンズ系を実現することが
できる。Therefore, in the image pickup lens system of the present invention,
Since the reflecting member is arranged between the positive and negative lens groups forming the afocal part so that the portion where the optical axis bends is located closest to the object side, the portion where the optical axis bends and the imaging lens The tolerance range of the positional deviation with the lens is increased, and the deterioration of the imaging performance due to manufacturing errors can be reduced. Furthermore, the space for bending the optical axis can be easily secured, and the size of the video camera can be reduced. It is possible to realize an imaging lens system that does not have restrictions on designing or restrictions on design.
【０００９】[0009]
【発明の実施の形態】以下に本発明撮像レンズ系の実施
の形態について、図示した各実施例に従って説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an image pickup lens system of the present invention will be described below with reference to the illustrated examples.
【００１０】尚、以下の各実施例は、本発明撮像レンズ
系をビデオカメラ用ズームレンズの撮像レンズ系に適用
したものである。The following embodiments apply the image pickup lens system of the present invention to the image pickup lens system of a zoom lens for a video camera.
【００１１】まず、後述する実施例１乃至３に共通の基
本的構成について説明する。First, a basic structure common to Examples 1 to 3 described later will be described.
【００１２】各実施例において、撮像レンズ系１、１Ａ
及び１Ｂは、所謂手振れの補正を行うアフォーカル部Ａ
Ｕが負の屈折力を有する負レンズ群ＮＬと正の屈折力を
有する正レンズ群ＰＬによって構成され、これら負レン
ズ群ＮＬと正レンズ群ＰＬとの間には反射部材ＰＲまた
はＭＲが配置される。In each embodiment, the imaging lens system 1, 1A
And 1B are afocal portions A for correcting so-called camera shake.
U is composed of a negative lens group NL having a negative refractive power and a positive lens group PL having a positive refractive power, and a reflecting member PR or MR is arranged between the negative lens group NL and the positive lens group PL. It
【００１３】従って、撮像レンズ系１、１Ａ及び１Ｂの
光軸Ｘは、反射部材ＰＲまたはＭＲの表面で約９０度折
れ曲がり、像面２の方へ延びている。Therefore, the optical axes X of the image pickup lens systems 1, 1A and 1B are bent at about 90 degrees on the surface of the reflecting member PR or MR and extend toward the image plane 2.
【００１４】尚、後述する実施例２は反射部材にミラー
ＭＲを用いた例であり、実施例１及び実施例３はプリズ
ムＰＲを用いた例である。A second embodiment to be described later is an example in which a mirror MR is used as a reflecting member, and a first embodiment and a third embodiment are examples in which a prism PR is used.
【００１５】また、アフォーカル部ＡＵはワイドコンバ
ーターとしても作用するようになっている。The afocal portion AU also functions as a wide converter.
【００１６】そして、結像レンズ部ＦＵは、物体側から
像面２の側へと順に正、負、正、正の屈折力を有する第
１乃至第４レンズ群ＧＲ１、ＧＲ２、ＧＲ３、ＧＲ４の
４群から成るズームレンズとされている。即ち、第１レ
ンズ群ＧＲ１及び第３レンズ群ＧＲ３は像面２に対して
固定されており、第２レンズ群ＧＲ２は広角側から望遠
側にズーミングする際には、図示しないレンズ鏡筒内に
おいて、物体側から像面２側に移動するようになってい
る。また、第４レンズ群ＧＲ４は上記第２レンズ群ＧＲ
２のズーミングに伴うピントの移動を補正するように移
動するようになっている。The image forming lens unit FU of the first to fourth lens groups GR1, GR2, GR3, GR4 having positive, negative, positive and positive refracting powers in order from the object side to the image plane 2 side. It is a zoom lens composed of four groups. That is, the first lens group GR1 and the third lens group GR3 are fixed with respect to the image plane 2, and the second lens group GR2 moves in the lens barrel (not shown) when zooming from the wide-angle side to the telephoto side. , From the object side to the image plane 2 side. The fourth lens group GR4 is the second lens group GR.
It moves so as to correct the movement of the focus due to the zooming of 2.
【００１７】また、第４レンズ群ＧＲ４と像面２との間
には光学的ローパスフィルターとしてのガラスブロック
ＦＬが配置されている。また、第２レンズ群ＧＲ２と第
３レンズ群ＧＲ３との間には絞り３が配置されている。Further, a glass block FL as an optical low-pass filter is arranged between the fourth lens group GR4 and the image plane 2. A diaphragm 3 is arranged between the second lens group GR2 and the third lens group GR3.
【００１８】尚、以下の説明において、「ｒ」は面の曲
率半径、「ｄ」は隣り合う２つの面の間の間隔、「Ｎ」
はｄ線（波長５８７．６ｎｍ）における屈折率、「ν」
はアッベ数、「ｆ」はレンズ全系の焦点距離、「ＦＮ
Ｏ」はレンズ全系のＦナンバー、「ω」は半画角とす
る。In the following description, "r" is the radius of curvature of the surface, "d" is the distance between two adjacent surfaces, and "N".
Is the refractive index at d-line (wavelength 587.6 nm), “ν”
Is the Abbe number, “f” is the focal length of the entire lens system, and “FN
“O” is the F number of the entire lens system, and “ω” is the half angle of view.
【００１９】そして、「ｒi」は物体側から像面２の側
へと順にｉ番目（ｉ＝１、２、３、・・・２８）の面の
曲率半径を示し、「ｄi」はｉ番面の面と（ｉ＋１）番
面の面との間の間隔を示し、「Ｎi」及び「νi」はｉ番
目の面と（ｉ＋１）番面の面との間の媒質のｄ線に対す
る屈折率及びアッベ数を示すものとする。"R i " indicates the radius of curvature of the i-th (i = 1, 2, 3, ... 28) surface in order from the object side to the image plane 2 side, and "d i " is The distance between the i-th surface and the (i + 1) -th surface is shown, where “N i ” and “ν i ” are d of the medium between the i-th surface and the (i + 1) -th surface. The refractive index and Abbe number for a line shall be shown.
【００２０】また、各実施例におけるレンズには、レン
ズ面が非球面形状から成るものも含まれる。従って、非
球面形状は次式により定義されるものとする。 Ｘａ＝ｃ・ｙ2／［１＋√（１−ｃ2・ｙ2）］＋Σ（Ａ
2i・ｙ2i） ここで、「Ｘａ」は非球面の光軸Ｘ方向の座標、「ｃ」
は近軸曲率（１／ｒ）、「Ａ」は第２ｉ次の非球面係
数、「ｙ」は光軸Ｘからの距離を示す。Further, the lens in each of the embodiments includes a lens having an aspherical surface. Therefore, the aspherical shape is defined by the following equation. Xa = c · y 2 / [1 + √ (1-c 2 · y 2 )] + Σ (A
2i · y 2i ) where “Xa” is the coordinate of the aspherical surface in the optical axis X direction, and “c”
Is a paraxial curvature (1 / r), “A” is a second i-th order aspherical coefficient, and “y” is a distance from the optical axis X.
【００２１】次に、各実施例について説明する。Next, each embodiment will be described.
【００２２】図１乃至図４は本発明撮像レンズ系の第１
の実施例１を示すものである。1 to 4 show the first embodiment of the image pickup lens system of the present invention.
FIG.
【００２３】撮像レンズ系１は、図１に示すように、物
体側から順に、アフォーカル部ＡＵが、負レンズ群ＮＬ
と正レンズ群ＰＬによって構成され、これら負レンズ群
ＮＬと正レンズ群ＰＬとの間には反射部材であるプリズ
ムＰＲが配置された２群２枚構成のレンズから成り、そ
して、上記アフォーカル部ＡＵに続く結像レンズ部ＦＵ
は、第１乃至第４レンズ群ＧＲ１、ＧＲ２、ＧＲ３、Ｇ
Ｒ４によって構成された４群９枚構成のレンズから成
る。In the image pickup lens system 1, as shown in FIG. 1, the afocal portion AU has a negative lens group NL in order from the object side.
And a positive lens group PL, and a lens having a two-group two-element configuration in which a prism PR which is a reflecting member is arranged between the negative lens group NL and the positive lens group PL, and the afocal part Imaging lens unit FU following AU
Is the first to fourth lens groups GR1, GR2, GR3, G
It is composed of a 9-element lens in 4 groups made up of R4.
【００２４】表１に上記第１の実施例における撮像レン
ズ系１の各値を示す。Table 1 shows each value of the image pickup lens system 1 in the first embodiment.
【００２５】[0025]
【表１】 [Table 1]
【００２６】尚、表１において、ｆは１．０乃至９．
６、ＦＮＯは１：１．６３乃至２．９１、２ωは６５．
６乃至７．０である。In Table 1, f is 1.0 to 9.
6, FNO is 1: 1.63 to 2.91, and 2ω is 65.
It is 6 to 7.0.
【００２７】また、２０番目及び２３番面の面は非球面
で構成される。表２に上記面の４次、６次、及び８次の
非球面係数Ａ4、Ａ6及びＡ8を示す。The 20th and 23rd surfaces are aspherical surfaces. Table 2 shows the fourth-order, sixth-order, and eighth-order aspherical surface coefficients A 4 , A 6, and A 8 of the above surfaces.
【００２８】[0028]
【表２】 [Table 2]
【００２９】尚、表２中の「ｅ」は、１０を底とする指
数表現を意味するものとする（以下に示す表５及び表８
においても同様）。Incidentally, "e" in Table 2 means exponential expression with base 10 (Tables 5 and 8 shown below).
Also in).
【００３０】更に、撮像レンズ系１の広角端から望遠端
へのズーミング動作に伴って、ｆが１．０００、２．４
６１５、９．５６９２と変化した時のｄ12、ｄ17、ｄ20
及びｄ23の各値について表３に示す。Further, with the zooming operation of the imaging lens system 1 from the wide-angle end to the telephoto end, f is 1.000, 2.4.
D 12 , d 17 , d 20 when changing to 615, 9.5692
Table 3 shows the respective values of d 23 and d 23 .
【００３１】[0031]
【表３】 [Table 3]
【００３２】図２乃至図４に上記第１の実施例における
撮像レンズ系１の球面収差図、非点収差図及び歪曲収差
図を示す。尚、図２は広角端、図３は標準、図４は望遠
端における上記各収差図を示し、また、球面収差図にお
いて、実線はｄ線（波長５８７．６ｎｍ）、破線はｇ線
（波長４３５．８ｎｍ）における値を示し、非点収差図
において、実線はサジタル像面、破線はメリディオナル
像面における値を示す。2 to 4 are a spherical aberration diagram, an astigmatism diagram and a distortion diagram of the image pickup lens system 1 in the first embodiment. 2 shows the above aberration diagrams at the wide-angle end, FIG. 3 at the standard end, and FIG. 4 at the telephoto end. In the spherical aberration diagram, the solid line is the d line (wavelength 587.6 nm), and the broken line is the g line (wavelength). (435.8 nm), and in the astigmatism diagram, the solid line shows the value on the sagittal image plane, and the broken line shows the value on the meridional image plane.
【００３３】図５乃至図８は本発明撮像レンズ系の第２
の実施例１Ａを示すものである。FIGS. 5 to 8 show the second part of the image pickup lens system of the present invention.
1A of the first embodiment.
【００３４】撮像レンズ系１Ａは、図５に示すように、
物体側から順に、アフォーカル部ＡＵが、負レンズ群Ｎ
Ｌと正レンズ群ＰＬによって構成され、これら負レンズ
群ＮＬと正レンズ群ＰＬとの間には反射部材であるミラ
ーＭＲが配置された２群２枚構成のレンズから成り、そ
して、上記アフォーカル部ＡＵに続く結像レンズ部ＦＵ
は、第１乃至第４レンズ群ＧＲ１、ＧＲ２、ＧＲ３、Ｇ
Ｒ４によって構成された４群９枚構成のレンズから成
る。The image pickup lens system 1A, as shown in FIG.
In order from the object side, the afocal part AU includes the negative lens group N
L and a positive lens group PL, and a lens having a two-group two-element structure in which a mirror MR as a reflecting member is arranged between the negative lens group NL and the positive lens group PL, and the afocal Imaging lens unit FU following unit AU
Is the first to fourth lens groups GR1, GR2, GR3, G
It is composed of a 9-element lens in 4 groups made up of R4.
【００３５】表４に上記第２の実施例における撮像レン
ズ系１Ａの各値を示す。Table 4 shows each value of the image pickup lens system 1A in the second embodiment.
【００３６】[0036]
【表４】 [Table 4]
【００３７】尚、表４において、ｆは１．０乃至９．
６、ＦＮＯは１：１．６３乃至３．５２、２ωは６１．
７乃至６．５である。In Table 4, f is 1.0 to 9.
6, FNO is 1: 1.63 to 3.52, and 2ω is 61.
7 to 6.5.
【００３８】また、１８番目及び２１番面の面は非球面
で構成される。表５に上記面の４次、６次、及び８次の
非球面係数Ａ4、Ａ6及びＡ8を示す。The 18th and 21st surfaces are aspherical surfaces. Table 5 shows the fourth-order, sixth-order, and eighth-order aspherical surface coefficients A 4 , A 6, and A 8 of the above surfaces.
【００３９】[0039]
【表５】 [Table 5]
【００４０】更に、撮像レンズ系１Ａの広角端から望遠
端へのズーミング動作に伴って、ｆが１．０００、２．
４８６３、９．５７４１と変化した時のｄ10、ｄ15、ｄ
18及びｄ21の各値について表６に示す。Further, with the zooming operation from the wide-angle end to the telephoto end of the image pickup lens system 1A, f is 1.000, 2.
D 10 , d 15 , d when changing to 4863, 9.5741
Table 6 shows the values of 18 and d 21 .
【００４１】[0041]
【表６】 [Table 6]
【００４２】図６乃至図８に上記第２の実施例における
撮像レンズ系１Ａの球面収差図、非点収差図及び歪曲収
差図を示す。尚、図６は広角端、図７は標準、図８は望
遠端における上記各収差図を示し、また、球面収差図に
おいて、実線はｄ線（波長５８７．６ｎｍ）、破線はｇ
線（波長４３５．８ｎｍ）における値を示し、非点収差
図において、実線はサジタル像面、破線はメリディオナ
ル像面における値を示す。6 to 8 are a spherical aberration diagram, an astigmatism diagram and a distortion diagram of the image pickup lens system 1A in the second embodiment. 6 shows the aberration diagrams at the wide-angle end, FIG. 7 shows the standard view, and FIG. 8 shows the above aberration diagrams at the telephoto end. In the spherical aberration diagram, the solid line is the d line (wavelength 587.6 nm), and the broken line is the g line.
The values at the line (wavelength 435.8 nm) are shown. In the astigmatism diagram, the solid line shows the value on the sagittal image plane, and the broken line shows the value on the meridional image plane.
【００４３】図９乃至図１２は本発明撮像レンズ系の第
３の実施例１Ｂを示すものである。9 to 12 show a third embodiment 1B of the imaging lens system of the present invention.
【００４４】撮像レンズ系１Ｂは、図９に示すように、
物体側から順に、アフォーカル部ＡＵが、負レンズ群Ｎ
Ｌと正レンズ群ＰＬによって構成され、これら負レンズ
群ＮＬと正レンズ群ＰＬとの間には反射部材であるプリ
ズムＰＲが配置された２群２枚構成のレンズから成り、
そして、上記アフォーカル部ＡＵに続く結像レンズ部Ｆ
Ｕは、第１乃至第４レンズ群ＧＲ１、ＧＲ２、ＧＲ３、
ＧＲ４によって構成された４群１０枚構成のレンズから
成る。The imaging lens system 1B, as shown in FIG.
In order from the object side, the afocal part AU includes the negative lens group N
L and a positive lens group PL, and a lens having a two-group two-element configuration in which a prism PR which is a reflecting member is arranged between the negative lens group NL and the positive lens group PL.
The imaging lens unit F following the afocal unit AU
U is the first to fourth lens groups GR1, GR2, GR3,
It is composed of 10 lenses in 4 groups made up of GR4.
【００４５】表７に上記第３の実施例における撮像レン
ズ系１Ｂの各値を示す。Table 7 shows each value of the image pickup lens system 1B in the third embodiment.
【００４６】[0046]
【表７】 [Table 7]
【００４７】尚、表７において、ｆは１．０乃至９．
６、ＦＮＯは１：１．６３乃至２．８６、２ωは６５．
２乃至７．０である。In Table 7, f is 1.0 to 9.
6, FNO is 1: 1.63 to 2.86, and 2ω is 65.
It is 2 to 7.0.
【００４８】また、３番目、２１番目及び２６番面の面
は非球面で構成される。表８に上記面の４次、６次、及
び８次の非球面係数Ａ4、Ａ6及びＡ8を示す。The third, 21st and 26th surfaces are aspherical surfaces. 4 following the surface Table 8 shows sixth, and the eighth-order aspherical coefficients A 4, A 6 and A 8.
【００４９】[0049]
【表８】 [Table 8]
【００５０】更に、撮像レンズ系１Ｂの広角端から望遠
端へのズーミング動作に伴って、ｆが１．０００、２．
４４９９、９．５８１２と変化した時のｄ13、ｄ18、ｄ
23及びｄ26の各値について表９に示す。Further, with the zooming operation from the wide-angle end to the telephoto end of the image pickup lens system 1B, f is 1.000, 2.
D 13 at the time of the change and 4499,9.5812, d 18, d
Table 9 shows the respective values of 23 and d 26 .
【００５１】[0051]
【表９】 [Table 9]
【００５２】図１０乃至図１２に上記第３の実施例にお
ける撮像レンズ系１Ｂの球面収差図、非点収差図及び歪
曲収差図を示す。尚、図１０は広角端、図１１は標準、
図１２は望遠端における上記各収差図を示し、また、球
面収差図において、実線はｄ線（波長５８７．６ｎ
ｍ）、破線はｇ線（波長４３５．８ｎｍ）における値を
示し、非点収差図において、実線はサジタル像面、破線
はメリディオナル像面における値を示す。10 to 12 are a spherical aberration diagram, an astigmatism diagram and a distortion diagram of the image pickup lens system 1B in the third embodiment. 10 is the wide-angle end, FIG. 11 is the standard,
FIG. 12 shows each of the above aberration diagrams at the telephoto end, and in the spherical aberration diagram, the solid line is the d line (wavelength 587.6n).
m) and the broken line show values at the g-line (wavelength 435.8 nm). In the astigmatism diagram, the solid line shows the value on the sagittal image plane and the broken line shows the value on the meridional image plane.
【００５３】上記第３の実施例１Ｂにおいては、最も物
体側のレンズＮＬは像面側の面がガラス球面上に樹脂層
を密着させた複合型非球面とされ、これによって歪曲収
差の補正を行うようになっている。In the third embodiment 1B, the lens NL closest to the object side is a compound type aspherical surface in which the surface on the image side is in close contact with the resin layer on the spherical surface of glass, thereby correcting distortion. I am supposed to do it.
【００５４】尚、上記各実施例において示したように、
反射部材としてはプリズムあるいはミラーが適してい
る。そして、特に、反射部材としてプリズムを用いる場
合には、屈折率の比較的高い硝材を用いることが望まし
い。このように、プリズムとして屈折率の比較的高い硝
材を用いることによって光路長を短くすることができる
ので、レンズの前玉径を小型化することができ、更に、
全反射が利用できるので反射膜が不要となり、反射膜を
設けた場合に比べて反射率を大きくすることができ、コ
スト的にも有利となる。As shown in the above embodiments,
A prism or a mirror is suitable as the reflecting member. In particular, when a prism is used as the reflecting member, it is desirable to use a glass material having a relatively high refractive index. In this way, since the optical path length can be shortened by using a glass material having a relatively high refractive index as the prism, the diameter of the front lens of the lens can be reduced, and further,
Since total reflection can be used, a reflection film is unnecessary, the reflectance can be increased as compared with the case where a reflection film is provided, and this is advantageous in terms of cost.
【００５５】また、アフォーカル部ＡＵをワイドコンバ
ーターとして作用するようにすると、負レンズ群ＮＬに
よって大きな負の歪曲収差が発生してしまうが、これを
補正するためには、最も物体側のレンズの少なくとも１
面に非球面を用いるとよい。この場合、非球面は、ガラ
ス非球面、プラスチック非球面、ガラス球面レンズ上に
樹脂層を密着させた複合型非球面での何れでもよい。Further, if the afocal part AU is made to act as a wide converter, a large negative distortion aberration will occur due to the negative lens group NL, but in order to correct this, the most lens on the object side is used. At least 1
It is preferable to use an aspherical surface. In this case, the aspherical surface may be any of a glass aspherical surface, a plastic aspherical surface, and a composite aspherical surface in which a resin layer is adhered onto a glass spherical lens.
【００５６】更に、アフォーカル部ＡＵの負レンズ群Ｎ
Ｌ及び正レンズ群ＰＬをそれぞれ単レンズによって構成
したので、上記各レンズ群ＮＬ、ＰＬの肉厚が薄くな
り、撮像レンズ系の小型化、低コスト化を図ることが可
能となる。Further, the negative lens group N of the afocal portion AU
Since each of the L and the positive lens group PL is composed of a single lens, the thickness of each of the lens groups NL and PL is thin, and it is possible to reduce the size and cost of the imaging lens system.
【００５７】更にまた、アフォーカル部ＡＵ、結像レン
ズ部ＦＵそれぞれで発生する色収差を小さくして、撮像
レンズ系全体の色収差を小さくしようとすると、アフォ
ーカル部ＡＵのレンズ構成が複雑になり、大型化、コス
トアップの原因となるが、本発明撮像レンズ系において
は、アフォーカル部ＡＵで補正しきれない色収差を結像
レンズ部ＦＵで補正するようにしているので、上記問題
が発生することはない。Furthermore, if the chromatic aberration generated in each of the afocal unit AU and the imaging lens unit FU is reduced to reduce the chromatic aberration of the entire imaging lens system, the lens structure of the afocal unit AU becomes complicated, Although it causes an increase in size and cost, in the image pickup lens system of the present invention, chromatic aberration that cannot be completely corrected by the afocal unit AU is corrected by the imaging lens unit FU, so that the above problem occurs. There is no.
【００５８】[0058]
【発明の効果】以上に記載したところから明らかなよう
に本発明撮像レンズ系は、物体側よりアフォーカル部、
結像レンズ部で構成される撮像レンズ系において、上記
アフォーカル部を構成する正と負の２つのレンズ群の間
に反射部材を配置し、該反射部材によって物体側からの
光軸と像面における光軸とが折り曲げられたことを特徴
とするものである。As is apparent from the above description, the image pickup lens system of the present invention has the afocal part from the object side,
In an imaging lens system including an image forming lens unit, a reflecting member is arranged between two positive and negative lens units forming the afocal unit, and the reflecting member causes an optical axis from the object side and an image plane. The optical axis at is bent.
【００５９】従って、本発明撮像レンズ系にあっては、
アフォーカル部を構成する正と負の２つのレンズ群の間
に反射部材を配置するようにして光軸が折れ曲がる箇所
を最も物体側になるようにしたので、光軸を折り曲げる
箇所と結像レンズ部との位置ずれ精度の許容範囲が大き
くなって、製造時の誤差による結像性能劣化が低減で
き、更に、光軸を折り曲げる箇所のスペースの確保が容
易となり、ビデオカメラの小型化への制約やデザイン上
の制約のない撮像レンズ系を実現することができる。Therefore, in the image pickup lens system of the present invention,
Since the reflecting member is arranged between the positive and negative lens groups forming the afocal part so that the portion where the optical axis bends is located closest to the object side, the portion where the optical axis bends and the imaging lens The tolerance range of the positional deviation with the lens is increased, the deterioration of the imaging performance due to manufacturing errors can be reduced, and the space for bending the optical axis can be easily secured. Therefore, it is possible to realize an imaging lens system that has no design restrictions.
【００６０】尚、前記実施例において示した具体的な形
状乃至構造は、本発明を実施するに当たっての具体化の
ほんの一例を示したものに過ぎず、これらによって本発
明の技術的範囲が限定的に解釈されるものではない。It should be noted that the specific shapes and structures shown in the above-mentioned embodiments are merely examples of the implementation in carrying out the present invention, and the technical scope of the present invention is limited by these. Is not to be interpreted.
【図１】図２乃至図４と共に、本発明撮像レンズ系の第
１の実施例を示すものであり、本図は構成を示す概略図
である。1 shows a first embodiment of the image pickup lens system of the present invention, together with FIGS. 2 to 4, and is a schematic diagram showing the configuration.
【図２】ズーミングの広角端における球面収差、非点収
差、歪曲収差を示す図である。FIG. 2 is a diagram showing spherical aberration, astigmatism, and distortion at the wide-angle end of zooming.
【図３】ズーミングの標準状態における球面収差、非点
収差、歪曲収差を示す図である。FIG. 3 is a diagram showing spherical aberration, astigmatism, and distortion in a standard state of zooming.
【図４】ズーミングの望遠端における球面収差、非点収
差、歪曲収差を示す図である。FIG. 4 is a diagram showing spherical aberration, astigmatism, and distortion at the telephoto end of zooming.
【図５】図６乃至図８と共に本発明撮像レンズ系の第２
の実施例を示すものであり、本図は構成を示す概略図で
ある。FIG. 5 is a second part of the imaging lens system of the present invention, together with FIGS. 6 to 8;
FIG. 3 is a schematic diagram showing the configuration of the present invention.
【図６】ズーミングの広角端における球面収差、非点収
差、歪曲収差を示す図である。FIG. 6 is a diagram showing spherical aberration, astigmatism, and distortion at the wide-angle end of zooming.
【図７】ズーミングの標準状態における球面収差、非点
収差、歪曲収差を示す図である。FIG. 7 is a diagram showing spherical aberration, astigmatism, and distortion in a standard state of zooming.
【図８】ズーミングの望遠端における球面収差、非点収
差、歪曲収差を示す図である。FIG. 8 is a diagram showing spherical aberration, astigmatism, and distortion at the telephoto end of zooming.
【図９】図１０乃至図１２と共に本発明撮像レンズ系の
第３の実施例を示すものであり、本図は構成を示す概略
図である。FIG. 9 shows a third embodiment of the imaging lens system of the present invention together with FIGS. 10 to 12, and is a schematic view showing the configuration.
【図１０】ズーミングの広角端における球面収差、非点
収差、歪曲収差を示す図である。FIG. 10 is a diagram showing spherical aberration, astigmatism, and distortion at the wide-angle end of zooming.
【図１１】ズーミングの標準状態における球面収差、非
点収差、歪曲収差を示す図である。FIG. 11 is a diagram showing spherical aberration, astigmatism, and distortion in a standard state of zooming.
【図１２】ズーミングの望遠端における球面収差、非点
収差、歪曲収差を示す図である。FIG. 12 is a diagram showing spherical aberration, astigmatism, and distortion at the telephoto end of zooming.
１ 撮像レンズ系 １Ａ 撮像レンズ系 １Ｂ 撮像レンズ系 ２ 像面 ＡＵ アフォーカル部 ＦＵ 結像レンズ部 ＮＬ 負レンズ群 ＰＬ 正レンズ群 ＰＲ 反射部材 ＭＲ 反射部材 Ｘ 光軸 1 Imaging lens system 1A Imaging lens system 1B Imaging lens system 2 Image plane AU Afocal part FU Imaging lens part NL Negative lens group PL Positive lens group PR Reflecting member MR Reflecting member X Optical axis
Claims (12)
部で構成される撮像レンズ系において、 上記アフォーカル部を構成する正と負の２つのレンズ群
の間に反射部材を配置し、 該反射部材によって物体側からの光軸と像面における光
軸とが折り曲げられたことを特徴とする撮像レンズ系。1. An imaging lens system comprising an afocal part and an imaging lens part from the object side, wherein a reflecting member is disposed between two positive and negative lens groups forming the afocal part, An imaging lens system in which an optical axis from the object side and an optical axis on an image plane are bent by a reflecting member.
ワイドコンバーターとして作用するようにしたことを特
徴とする請求項１に記載の撮像レンズ系。2. The image pickup lens system according to claim 1, wherein the afocal portion functions as a wide converter that widens the angle of view.
非球面で構成されていることを特徴とする請求項２記載
の撮像レンズ系。3. The image pickup lens system according to claim 2, wherein at least one surface of the lens closest to the object side is an aspherical surface.
群がそれぞれ単レンズで構成されていることを特徴とす
る請求項１に記載の撮像レンズ系。4. The image pickup lens system according to claim 1, wherein each of the positive lens group and the negative lens group of the afocal portion is composed of a single lens.
群がそれぞれ単レンズで構成されていることを特徴とす
る請求項２に記載の撮像レンズ系。5. The imaging lens system according to claim 2, wherein each of the positive lens group and the negative lens group of the afocal portion is composed of a single lens.
群がそれぞれ単レンズで構成されていることを特徴とす
る請求項３に記載の撮像レンズ系。6. The image pickup lens system according to claim 3, wherein each of the positive lens group and the negative lens group of the afocal portion is composed of a single lens.
収差及び結像レンズ部において発生する倍率色収差がア
フォーカル部と結像レンズ部とによって相互に補完し合
うようにしたことを特徴とする請求項１に記載の撮像レ
ンズ系。7. The axial chromatic aberration generated in the afocal portion and the lateral chromatic aberration generated in the imaging lens portion are mutually complemented by the afocal portion and the imaging lens portion. The imaging lens system according to 1.
収差及び結像レンズ部において発生する倍率色収差がア
フォーカル部と結像レンズ部とによって相互に補完し合
うようにしたことを特徴とする請求項２に記載の撮像レ
ンズ系。8. The axial chromatic aberration generated in the afocal part and the lateral chromatic aberration generated in the imaging lens part are mutually complemented by the afocal part and the imaging lens part. The imaging lens system according to 2.
収差及び結像レンズ部において発生する倍率色収差がア
フォーカル部と結像レンズ部とによって相互に補完し合
うようにしたことを特徴とする請求項３に記載の撮像レ
ンズ系。9. The axial chromatic aberration generated in the afocal portion and the lateral chromatic aberration generated in the imaging lens portion are mutually complemented by the afocal portion and the imaging lens portion. The imaging lens system according to item 3.
色収差及び結像レンズ部において発生する倍率色収差が
アフォーカル部と結像レンズ部とによって相互に補完し
合うようにしたことを特徴とする請求項４に記載の撮像
レンズ系。10. The axial chromatic aberration generated in the afocal portion and the lateral chromatic aberration generated in the imaging lens portion are mutually complemented by the afocal portion and the imaging lens portion. The imaging lens system according to item 4.
色収差及び結像レンズ部において発生する倍率色収差が
アフォーカル部と結像レンズ部とによって相互に補完し
合うようにしたことを特徴とする請求項５に記載の撮像
レンズ系。11. The axial chromatic aberration generated in the afocal part and the lateral chromatic aberration generated in the imaging lens part are mutually complemented by the afocal part and the imaging lens part. The imaging lens system according to item 5.
色収差及び結像レンズ部において発生する倍率色収差が
アフォーカル部と結像レンズ部とによって相互に補完し
合うようにしたことを特徴とする請求項６に記載の撮像
レンズ系。12. The axial chromatic aberration generated in the afocal part and the lateral chromatic aberration generated in the imaging lens part are mutually complemented by the afocal part and the imaging lens part. The imaging lens system according to item 6.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7315799A JPH09133858A (en) | 1995-11-10 | 1995-11-10 | Image pickup lens system |
| US08/745,056 US6104432A (en) | 1995-11-10 | 1996-11-07 | Compact image pickup lens system for a video camera |
| EP96308113A EP0773460B1 (en) | 1995-11-10 | 1996-11-08 | Image pickup lens system for a video camera |
| DE69626930T DE69626930T2 (en) | 1995-11-10 | 1996-11-08 | Imaging lens system for video camera |
| KR1019960053575A KR100424961B1 (en) | 1995-11-10 | 1996-11-08 | Compact image pickup lens system for a video camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7315799A JPH09133858A (en) | 1995-11-10 | 1995-11-10 | Image pickup lens system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09133858A true JPH09133858A (en) | 1997-05-20 |
Family
ID=18069698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7315799A Pending JPH09133858A (en) | 1995-11-10 | 1995-11-10 | Image pickup lens system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09133858A (en) |
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| JP2002372667A (en) * | 2001-06-14 | 2002-12-26 | Konica Corp | Zoom lens |
| JP2004053993A (en) * | 2002-07-22 | 2004-02-19 | Nidec Copal Corp | Zoom lens |
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| JP2005173191A (en) * | 2003-12-11 | 2005-06-30 | Olympus Corp | Optical path bending optical system |
| JP2005195757A (en) * | 2004-01-05 | 2005-07-21 | Sony Corp | Zoom lens and imaging device |
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-
1995
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