JP2567083B2 - Shooting lens - Google Patents
Shooting lensInfo
- Publication number
- JP2567083B2 JP2567083B2 JP1048909A JP4890989A JP2567083B2 JP 2567083 B2 JP2567083 B2 JP 2567083B2 JP 1048909 A JP1048909 A JP 1048909A JP 4890989 A JP4890989 A JP 4890989A JP 2567083 B2 JP2567083 B2 JP 2567083B2
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- lens
- movable
- optical axis
- movable lens
- 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.)
- Expired - Lifetime
Links
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、テレビジヨンカメラ用のズームレンズ、特
にマクロ撮影とトラツキング調整が可能なズームレンズ
に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens for a television camera, and more particularly to a zoom lens capable of macro photography and tracking adjustment.
従来よりカメラ本体から着脱可能なテレビジヨン用の
交換レンズが形成する被写体像をテレビカメラ本体の撮
像面上に鋭明に結像させるために、ズームレンズのリレ
ーレンズ群を移動させて行う技術、所謂トラツキング調
整は知られている。Conventionally, a technique performed by moving a relay lens group of a zoom lens in order to sharply form a subject image formed by an interchangeable lens for a television projector detachable from a camera body on an image pickup surface of the television camera body, The so-called tracking adjustment is known.
また、マクロ撮影を行う場合にも同様にリレーレンズ
群を移動させて行う技術も知られている。Also, a technique for moving a relay lens group in the same manner when performing macro shooting is known.
ところで、特公昭58−1401号公報では、同じリレーレ
ンズ群を光軸に沿って移動させ、マクロ撮影とトラツキ
ング調整とを可能ならしめるために、リレーレンズ群を
移動させてマクロ撮影を行った後に通常の撮影モードに
移る際、再度リレーレンズ群を元のトラツキング調整さ
れたトラツキング位置へ復帰させる技術を提案してい
る。By the way, in Japanese Patent Publication No. Sho 58-1401, after moving the same relay lens group along the optical axis and moving the relay lens group to perform macro photography in order to enable macro photography and tracking adjustment, There is proposed a technique for returning the relay lens group to the original tracking position where the tracking has been adjusted again when shifting to the normal shooting mode.
しかしながら、上述した特公昭58−1401号公報に於い
ては、１つのリレーレンズ群で各機能を兼用させるため
に、マクロ撮影機構とトラツキング調整機構と、更にこ
の二つの機構を連動させるための機構とを設ける必要が
ある。However, in the above-mentioned Japanese Patent Publication No. 58-1401, a macro photographing mechanism, a tracking adjusting mechanism, and a mechanism for interlocking these two mechanisms are combined so that one relay lens group also has each function. And must be provided.
従って、メカニカルな構成上の複雑化，大型化を招く
一方、各機構、トラツキング調整用のレンズ群を復帰さ
せるための機構に正確に精度が要求されていた。Therefore, while the mechanical structure is complicated and the size is increased, the precision is required accurately for each mechanism and the mechanism for returning the lens group for tracking adjustment.
本発明の目的は、上述した問題点を解決するための撮
影光学系を提供することにある。An object of the present invention is to provide a photographic optical system for solving the above-mentioned problems.
物体側より順に、合焦部と変倍部を含むレンズ群、結
像作用を果し最も長い空気間隔を隔てて前群と後群より
なるリレーレンズ群より構成される撮影レンズであっ
て、前記リレーレンズ群の後群はマクロ撮影のために光
軸に沿って移動する第１可動レンズ群と、トラツキング
調整のために光軸に沿って移動する第２可動レンズ群を
備えるとともに、前記後群、前記第１可動レンズ群の焦
点距離を各々fR,fMとしたとき、 1.2＜fM/fR＜1.9 なる条件式を満足させることである。From the object side, in order from the object side, a lens group including a focusing portion and a variable power portion, a photographing lens composed of a relay lens group consisting of a front group and a rear group with an image forming action and a longest air space, The rear lens group of the relay lens group includes a first movable lens group that moves along the optical axis for macro photography and a second movable lens group that moves along the optical axis for tracking adjustment. When the focal lengths of the group and the first movable lens group are f R and f M , respectively, the conditional expression 1.2 <f M / f R <1.9 is satisfied.
第１図，第３図は本発明に関する数値実施例1,2のレ
ンズ断面図である。1 and 3 are lens cross-sectional views of Numerical Embodiments 1 and 2 according to the present invention.
G1は正の屈折力を有し、合焦のために光軸方向へ移動
自在な合焦レンズ群、レンズ群G2,G3は変倍のための変
倍レンズ群であり、特にG2は負の屈折力を有しズーミン
グの際に光軸に沿って移動してバリエータの作用を果
し、G3は負の屈折力を有しズーミングの際の像面移動を
補償するコンペンセーターの作用を果す。また、G4は結
像作用を果すリレーレンズ群である。このリレーレンズ
群G4は最も長い空気間隔を隔てて物体側にリレー前群G
41、像面側にリレー後群G42が配置されて構成されてい
る。尚、この前群G41と後群G42の間のスペースは、エク
ステンダー等の光学部材を配置させるために使うことの
可能な空間である。また、本例では前群，後群ともに正
屈折力を持つ。尚、レンズ断面図に於いて、Ｐは色分解
プリズムの等価物を示す。G 1 has a positive refractive power and is a focusing lens group that is movable in the optical axis direction for focusing, and lens groups G 2 and G 3 are zoom lens groups for zooming. 2 has a negative refractive power and moves along the optical axis during zooming to act as a variator, and G 3 has a negative refractive power and compensates for image plane movement during zooming. Acts as Also, G 4 is a relay lens group to fulfill the imaging action. This relay lens group G 4 is located on the object side with the longest air gap,
41 , a relay rear group G42 is arranged on the image plane side. Incidentally, the space between the rear group G 42 and the front group G 41 is a space capable of using in order to place an optical member extender and the like. In this example, both the front group and the rear group have positive refractive power. In the sectional view of the lens, P indicates an equivalent of a color separation prism.
本発明に関するリレーレンズ群G4のリレー後群G
42は、正の屈折率を有しマクロ撮影時に光軸に沿って移
動する第１可動レンズ群GMと，正の屈折力を有しトラツ
キング調整時に光軸に沿って移動する第２可動レンズ群
GFから成っている。The rear lens group G 4 of the relay lens group G 4 according to the present invention
Reference numeral 42 denotes a first movable lens group G M having a positive refractive index that moves along the optical axis during macro photography, and a second movable lens that has a positive refractive power and moves along the optical axis during tracking adjustment. group
Made of G F.
尚、第１可動レンズ群GMと第２可動レンズ群GFとは、
それぞれ後述する通り鏡筒に設けられたマクロ用カム溝
とトラツキング調整用のカム溝に沿って移動している。The first movable lens group G M and the second movable lens group G F are
As will be described later, they move along a macro cam groove and a tracking adjustment cam groove provided in the lens barrel.
このように、本発明に於いては、マクロ撮影とトラツ
キング調整を独立に移動制御しているので、従来に示す
ような連動機構を不要とし、複雑化を招くことはない。As described above, in the present invention, since the movement of the macro photography and the tracking adjustment are controlled independently, the interlocking mechanism as shown in the related art is not required, and no complication is caused.
さて、次に本発明に関する光学系を小型化しながら良
好な光学性能を維持するため、特に第1,第２可動レンズ
群を移動させた際の収差を良好に補正するための条件を
以下に示す。Now, conditions for maintaining good optical performance while miniaturizing the optical system according to the present invention, and particularly for properly correcting aberrations when the first and second movable lens groups are moved are described below. .
それは、前記リレーレンズ群の後群、前記第１可動レ
ンズ群の焦点距離をそれぞれfR,fMとした時、 1.2＜fM/fR＜1.9 …（１） なる条件式を満足させることである。That is, when the focal lengths of the rear lens group of the relay lens group and the first movable lens group are f R and f M , respectively, the conditional expression 1.2 <f M / f R <1.9 (1) should be satisfied. Is.
上記各条件中の（１）式はマクロ撮影時に移動する第
１可動レンズ群の焦点距離fMとリレーレンズ後群の焦点
距離fRに関する条件で、第１可動レンズ群を適切なパワ
ーに設定し、相当な至近撮影つまりマクロフオーカシン
グとトラツキング調整時の変動する収差をバランスよく
維持させながらレンズ系の小型化を図るための条件であ
る。下限を越えると第１可動レンズ群のパワーが強くな
りすぎるため、マクロ撮影時あるいはトラツキング調整
時の球面収差，コマ収差，像面湾曲等の変動を抑えるこ
とが困難になってくる。一方、上限を越えるとマクロフ
オーカシングを行う際の第１可動レンズ群GMの移動量が
大きくなりすぎ、またレンズ系が大型化してくる。Formula (1) in each of the above conditions is a condition related to the focal length f M of the first movable lens unit that moves during macro photography and the focal length f R of the rear lens unit of the relay lens, and sets the first movable lens unit to an appropriate power. However, this is a condition for downsizing the lens system while maintaining a well-balanced close-up, that is, a fluctuating aberration during macro focusing and tracking adjustment. If the value goes below the lower limit, the power of the first movable lens unit becomes too strong, and it becomes difficult to suppress variations in spherical aberration, coma aberration, field curvature, etc. during macro photography or tracking adjustment. On the other hand, if the upper limit is exceeded, the amount of movement of the first movable lens group G M when performing macro focusing becomes too large, and the lens system becomes large.
尚、実施例に於いては前記第１可動レンズ群GMを物体
側より順に像面側に凸面を向けた正メニスカスレンズ、
物体側に凹面を向けた負レンズと、そして正の貼り合せ
レンズ、正と負の貼り合せレンズで全体として正の屈折
力を持たせるとよい。また第２可動レンズ群は物体側に
凸面を向けた正レンズで構成するとよい。尚、第２可動
レンズ群は正と負の貼り合せで構成してもさしつかえな
い。In the embodiment, a positive meniscus lens having the first movable lens group G M whose convex surface faces the image plane side in order from the object side,
A negative lens having a concave surface on the object side, a positive cemented lens, and a positive and negative cemented lens should have positive refracting power as a whole. The second movable lens group may be composed of a positive lens whose convex surface faces the object side. The second movable lens group may be composed of positive and negative cemented pieces.
次に、第５図で各可動レンズ群を移動させるための構
造について簡単に説明する。尚、第５図（Ｂ）は第５図
（Ａ）の切断線ｌで切った断面図である。Next, a structure for moving each movable lens group will be briefly described with reference to FIG. Incidentally, FIG. 5 (B) is a sectional view taken along the cutting line 1 in FIG. 5 (A).
Ｗは固定筒で、固定レンズGP,GN等を保持するととも
に光軸と平行にマクロフオーカシングとトラツキング調
整のための直線状の案内溝が切ってある。WM,WFは第1,
第２の可動レンズ群GM,GFを、駆動ピンP1,P2を介して移
動制御する斜の直線カム溝が切ってある回転筒である。W is a fixed barrel, which holds fixed lenses G P , G N, etc., and is provided with a linear guide groove parallel to the optical axis for adjusting macro focusing and tracking. W M , W F is the first
The second group of movable lens G M, the G F, a rotary cylinder which linear cam groove of the swash moving control are cut through the drive pin P 1, P 2.
マクロ撮影、又はトラツキング調整を行う場合は回転
筒WM又はWFをそれぞれ回転させて実施する。Macro shooting, or when performing tracking adjustment performed by rotating each rotation cylinder W M or W F.
後述する本発明の実施例では、まず第１実施例に於い
て、マクロ撮影時に第１可動レンズ群GMは広角端で物体
距離が第１レンズ面から10mmの場合、GMは−3.50mm移動
し、トラツキング調整時には第２可動レンズ群の−1.0m
mの移動に対して像面移動量は−0.57mmである。In an embodiment of the present invention described later, first, in the first embodiment, when the first movable lens group G M is at the wide angle end and the object distance is 10 mm from the first lens surface during macro photography, G M is −3.50 mm. Move and adjust tracking by -1.0m of second movable lens group
The amount of movement of the image plane is -0.57 mm for a movement of m.
第２実施例に於いて、第１可動レンズ群GMは広角端で
物体距離が第１レンズ面から10mmの場合、GMは−4.58mm
移動し、トラツキング調整時に第２可動レンズ群の−1.
0mmの移動に対して像面移動量は−0.67mmである。In the second embodiment, when the first movable lens group G M is at the wide-angle end and the object distance is 10 mm from the first lens surface, G M is -4.58 mm.
Move to move the second movable lens group -1.
The amount of movement of the image plane is -0.67 mm with respect to the movement of 0 mm.
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
は物体側より順に第ｉ番目のレンズ厚及び空気間隔、Ni
とυｉは夫々物体側より順に第ｉ番目のレンズのガラス
の屈折率とアツベ数である。Next, numerical examples of the present invention will be shown. In the numerical example
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 in order from the object side, Ni
And υi are the refractive index and the Abbe number of the glass of the i-th lens in order from the object side.
第１図，第３図はそれぞれ本発明に関する数値実施例1,
2のレンズ断面図である。 第２図，第４図はそれぞれ数値実施例1,2の諸収差図。
尚、収差図に於いて（Ａ），（Ｂ）はそれぞれ広角端，
望遠端に於ける物体距離が無限遠時の諸収差図、（Ｃ）
は広角端でのマクロ撮影状態（物体距離は第１レンズ面
から10mm）に於ける諸収差図、（Ｄ）は広角端無限遠物
体に対して第２可動レンズ群を明細書に示す移動距離だ
け移動させた時の諸収差図である。 第５図は本発明に関する各可動レンズ群の移動機構を示
す図。FIGS. 1 and 3 are numerical examples 1 and 2, respectively, relating to the present invention.
FIG. 3 is a lens cross-sectional view of 2. 2 and 4 are aberration diagrams of Numerical Examples 1 and 2, respectively.
In the aberration diagrams, (A) and (B) are the wide-angle end,
Aberration diagrams when the object distance at the telephoto end is infinity, (C)
Is a diagram of various aberrations in a macro photography state at the wide-angle end (object distance is 10 mm from the first lens surface), and (D) is a moving distance shown in the specification for the second movable lens group with respect to an object at infinity at the wide-angle end. It is a various-aberration figure at the time of moving only. FIG. 5 is a diagram showing a moving mechanism of each movable lens group according to the present invention.
Claims (1)
ンズ群、結像作用を果し当レンズ群中の最も長い空気間
隔を隔てて前群と後群よりなるリレーレンズ群より構成
される撮影レンズであって、前記リレーレンズ群の後群
はマクロ撮影のために光軸に沿って移動し正の屈折力を
有する第１可動レンズ群と、トラッキング調整のために
光軸に沿って移動し正の屈折力を有する第２可動レンズ
群を備えるとともに、前記後群、前記第１可動レンズ群
の焦点距離を各々fR,fMとした時 1.2＜fM/fR＜1.9 なる条件式を満足することを特徴とする撮影レンズ。1. A relay lens group including, in order from the object side, a lens group including a focusing portion and a variable power portion, and a front lens group and a rear lens group that perform an image forming action and are separated by the longest air space in the lens group. The rear lens group of the relay lens group includes a first movable lens group that moves along the optical axis for macro photography and has a positive refractive power, and an optical axis for tracking adjustment. A second movable lens unit having a positive refracting power that moves along the optical axis, and the focal lengths of the rear unit and the first movable lens unit are f R and f M , respectively, 1.2 <f M / f R A taking lens characterized by satisfying the conditional expression <1.9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1048909A JP2567083B2 (en) | 1989-02-28 | 1989-02-28 | Shooting lens |
| US07/804,513 US5191475A (en) | 1989-02-09 | 1991-12-10 | Zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1048909A JP2567083B2 (en) | 1989-02-28 | 1989-02-28 | Shooting lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02226216A JPH02226216A (en) | 1990-09-07 |
| JP2567083B2 true JP2567083B2 (en) | 1996-12-25 |
Family
ID=12816386
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1048909A Expired - Lifetime JP2567083B2 (en) | 1989-02-09 | 1989-02-28 | Shooting lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2567083B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05273468A (en) * | 1992-03-27 | 1993-10-22 | Fuji Photo Optical Co Ltd | Zoom lens optical system |
| JP5035867B2 (en) * | 2005-12-01 | 2012-09-26 | 富士フイルム株式会社 | Endoscope objective lens |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51134140A (en) * | 1975-05-15 | 1976-11-20 | Minolta Camera Co Ltd | High-magnification zoom lens capable of macro photographing |
| JPS5971016A (en) * | 1982-10-15 | 1984-04-21 | Canon Inc | Zoom lens capable of microphotography |
-
1989
- 1989-02-28 JP JP1048909A patent/JP2567083B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02226216A (en) | 1990-09-07 |
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