JPS5833533B2 - zoom lens - Google Patents
zoom lensInfo
- Publication number
- JPS5833533B2 JPS5833533B2 JP11946078A JP11946078A JPS5833533B2 JP S5833533 B2 JPS5833533 B2 JP S5833533B2 JP 11946078 A JP11946078 A JP 11946078A JP 11946078 A JP11946078 A JP 11946078A JP S5833533 B2 JPS5833533 B2 JP S5833533B2
- Authority
- JP
- Japan
- Prior art keywords
- group
- lens
- lenses
- refractive power
- negative
- 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
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Description
【発明の詳細な説明】
本発明は8ミリ撮影機等の撮影用ズームレンズに関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a zoom lens for photographing an 8 mm camera or the like.
従来、8ミリ撮影用のズームレンズの広角化を図ろうと
する場合、第■群及び第■群の径が大きくなり過ぎ、又
レンズ枚数も多く必要となる為実用化が困難であった。Conventionally, when trying to widen the angle of an 8 mm zoom lens, it was difficult to put it into practical use because the diameters of the first and second groups would be too large and a large number of lenses would be required.
尚従来の8ミリ撮影用ズームレンズは有効画面径7,1
皿に対して標準的なズーム域として、3倍ズームの場合
に焦点距離9〜27mm乃至10〜301mであり、6
倍ズームの場合に焦点距離8〜48mm乃至9〜54間
である。In addition, the conventional 8mm shooting zoom lens has an effective screen diameter of 7.1
The standard zoom range for a dish is a focal length of 9 to 27 mm to 10 to 301 m for 3x zoom;
In the case of double zoom, the focal length is between 8 and 48 mm and 9 and 54 mm.
本発明の目的は口径比に1:1.2迄可能な大口径比広
角化を達成すると共にコンパクトであって全変倍域に亘
り収差補正が良好になされたズームレンズを提供するこ
とにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a zoom lens that achieves a wide-angle aperture ratio of up to 1:1.2, is compact, and has aberrations well corrected over the entire zoom range. .
本発明の第1実施例を第1図に基づいて説明する。A first embodiment of the present invention will be described based on FIG.
尚この第1実施例のズームレンズは焦点距離7〜21間
、口径比1:1.2、有効画面径7.1關03倍ズーム
レンズに関するものである。The zoom lens of the first embodiment is a zoom lens having a focal length of 7 to 21, an aperture ratio of 1:1.2, an effective screen diameter of 7.1, and a magnification of 0.3 times.
物体側前方より順次、第1群は正の屈折力を有し、61
〜G303枚レンズからなり、G1 は物体に向って凸
なる負メニスカスレンズ、G2は曲率犬なる面を物体側
に向けた正レンズで、G1 と62 は適当な間隔を
保っている。Sequentially from the front on the object side, the first group has positive refractive power, 61
~G30 It consists of three lenses, G1 is a negative meniscus lens that is convex toward the object, G2 is a positive lens whose curvature dog surface faces the object side, and G1 and 62 are kept at an appropriate distance.
G3 は物体に向って凸なる正メニスカスレンズである
。G3 is a positive meniscus lens that is convex toward the object.
第■群は負の屈折力を有し、04〜G603枚レンズか
らなり、G4 は物体に向って凸なる負メニスカスレン
ズ、G、は曲率犬なる凹面を像側に向けた負レンズ、G
6 は物体に向って凸なる正メニスカスレンズで、G5
とG6 は適当な間隔を保っている。Group Ⅰ has negative refractive power and consists of three lenses from 04 to G60, G4 is a negative meniscus lens convex toward the object, G is a negative lens with a concave surface facing the image side, and G is a negative lens with a concave surface facing the image side.
6 is a positive meniscus lens convex toward the object, G5
and G6 maintain an appropriate distance.
第■群は負の屈折力を有し、物体に向って凹なる負メニ
スカスレンズである。The second group is a negative meniscus lens that has negative refractive power and is concave toward the object.
第■群は正の屈折力を有し、固定された1枚又は2枚の
レンズからなる。The second group has positive refractive power and consists of one or two fixed lenses.
第■群と第■群の間に一眼レフレックス用の光路分岐用
部材、例えばプリズム、ミラー等を配置する。An optical path branching member for single-lens reflex, such as a prism, a mirror, etc., is arranged between the 2nd group and the 2nd group.
第■群乃至第■群でアフォーカル系を構成し、その後方
に数枚のレンズからなる固定された結像レンズ、すなわ
ち第V群を配置する。The afocal system is composed of the groups (1) to (2), and a fixed imaging lens consisting of several lenses, that is, the V group, is arranged behind the afocal system.
第1群、第■群、第■群の光軸方向の移動により、夫々
第1群は有限物体に対する結像作用、第■群は変倍作用
、第■群は第■群の移動により生ずる焦点移動の補正作
用がある。By moving the 1st group, 2nd group, and 2nd group in the optical axis direction, the 1st group has an imaging effect on a finite object, the 2nd group has a variable magnification effect, and the 2nd group has a movement of the 2nd group. It has the effect of correcting focus movement.
上記ズームレンズ系に於て、
fl、f■;夫々第1群及び第■群の焦点距離r;順順
次各折折面曲率半径
d;順次各面間軸上間隔
■a;広角端と望遠端のアフォーカル系角倍率の相乗平
均
≦とした時、
(イ)0.6≦va≦0.8
(ロ)0.05≦d2/f■≦0.12
(/→ 0.6≦(1/ r21 / r 1) f
I≦0.9に)0.8≦(1/r4+1/r5 ) f
I@90.05≦ci1o/ l fII l≦0.
10(−)0.6≦(1/ r7+ i / r8+
1/ rg) lfI[1()) 0.4 ≦(
1/ rll 1/ r12 ) l f
n l ≦0.7なる関係を保つ様にする。In the above zoom lens system, fl, f■; Focal length r of the first group and second group, respectively; Radius of curvature of each folding surface d; Sequential axial distance between each surface ■a; Wide-angle end and telephoto When the geometric mean of the afocal system angular magnification at the edge is ≦, (a) 0.6≦va≦0.8 (b) 0.05≦d2/f■≦0.12 (/→ 0.6≦( 1/r21/r1) f
I≦0.9)0.8≦(1/r4+1/r5) f
[email protected]≦ci1o/ l fII l≦0.
10(-)0.6≦(1/r7+ i/r8+
1/ rg) lfI[1()) 0.4 ≦(
1/rll 1/r12) l f
The relationship n l ≦0.7 is maintained.
この関係を保ち、又第■群と第■群との間に前記光路分
岐用部材、例えば光路分岐用プリズムや光路分岐用ミラ
ー等を配置する事により、コンパクトな広角化が図れる
と共に全ズーム域に亘り良好な収差補正が得られる。By maintaining this relationship and arranging the optical path branching member, such as an optical path branching prism or an optical path branching mirror, between the first group and the second group, it is possible to achieve a compact wide angle and to cover the entire zoom range. Good aberration correction can be obtained over the entire range.
すなわち、(イ)式の上限及び(ロ)式、(ホ)式の下
限により広角化を図り、又(イ)式の下限により第■群
及び第■群の屈折力が強くなり過ぎる事による収差補正
の困難を防止している。In other words, the upper limit of formula (a) and the lower limit of formulas (b) and (e) are used to widen the angle of view, and the lower limit of formula (a) prevents the refractive power of the groups ■ and ■ from becoming too strong. This prevents the difficulty of correcting aberrations.
又広角化により歪曲収差が増大する為望遠側の歪曲収差
補正にに)式の条件を、広角側の歪曲収差の補正に(へ
)式の条件を与えている。Furthermore, since distortion aberration increases as the angle of view becomes wider, the condition of equation (2) is given for correction of distortion on the telephoto side, and the condition of equation (2) is given for correction of distortion aberration on the wide-angle side.
又広角化による色収差、特に軸外色収差の増大を防ぐ為
、09式、(ト)式、(ロ)式の上限及び(ホ)式の上
限を与えている。In addition, in order to prevent an increase in chromatic aberration, especially off-axis chromatic aberration, due to widening of the angle of view, upper limits are given to formulas 09, (g), and (b), and to formula (e).
又(イ)式の下限により望遠側の外向性コマを極力減少
させている。Also, by using the lower limit of formula (A), the extroverted coma on the telephoto side is reduced as much as possible.
次にこの第1実施例の諸元数値を示す。Next, numerical values of specifications of this first embodiment will be shown.
r;順次各層折面の曲率半径
d;順次各面間軸上間隔
N;順次各レンズのd線に対する屈折率
ν;順次各レンズのアツベ数
〔第1実施例〕3倍ズームレンズ
焦点距離f=7〜21間、口径比1:1.2、有効画面
径7.1朋。r; radius of curvature d of the folding surface of each layer; axial spacing N between each surface; refractive index ν of each lens with respect to the d-line; Abbe number of each lens [First Example] 3x zoom lens focal length f =7 to 21, aperture ratio 1:1.2, effective screen diameter 7.1.
を第2図(f=7.0間)、第3図(f=12.5重(
転)、第4図(f=21.0薦0に示す。Figure 2 (between f = 7.0) and Figure 3 (f = 12.5 times (
Figure 4 (f=21.0 recommendation 0).
次に本発明の第2実施例を第5図に示す。Next, a second embodiment of the present invention is shown in FIG.
この第2実施例は焦点距離6.5〜39 mm、口径比
l:1.2、有効画面径7.1間の6倍ズームレンズに
関するもので、第1実施例の構成とは第■群に於て、2
枚のレンズを使用している点で異なる。This second embodiment relates to a 6x zoom lens with a focal length of 6.5 to 39 mm, an aperture ratio l: 1.2, and an effective screen diameter of 7.1. In 2
It differs in that it uses two lenses.
この第2実施例の諸元数値を示す。The numerical values of the specifications of this second embodiment are shown.
〔第2実施例〕6倍ズームレンズ
焦点距離f=6.5〜39間、口径比1:1.2、有効
画面径7.1皿。[Second embodiment] 6x zoom lens focal length f=6.5 to 39, aperture ratio 1:1.2, effective screen diameter 7.1 plates.
焦点距離fが6.5.19.0.39.0mmIJ)場
合に於げるd6、d1□、d14の値は、
又この第2実施例のズームレンズの収差曲線図を第6図
(f=6.5mmm第八図(f =19.0mm)第8
図(f =39.0mm)に示す。The values of d6, d1□, and d14 when the focal length f is 6.5.19.0.39.0 mm (IJ) are also shown in Fig. 6 (f = 6.5mmmm Fig. 8 (f = 19.0mm) Fig. 8
It is shown in the figure (f = 39.0 mm).
この様に本発明によれば、第■群の結像レンズ及び第■
群の変倍レンズの収差を少なくする事が出来、この収差
を少なくする事によって、光路分岐用部材(プリズム、
ミラー)を置くための空間を得る効果、第■群の補正レ
ンズに単レンズを用い得る効果、第■群及び第V群のリ
レーレンズのレンズ枚数を減らし得る効果が得られる。As described above, according to the present invention, the imaging lens of the first group and the second group
It is possible to reduce the aberration of the variable magnification lens in the group, and by reducing this aberration, optical path branching members (prisms,
This provides the effect of obtaining a space for placing a mirror), the effect of using a single lens as the correction lens of the 1st group, and the effect of reducing the number of relay lenses of the 2nd group and the V group.
さらに上記光路分岐用部材に関連して第1群〜第■群の
アフォーカル系に於げる第■群と第■群との間に光路分
岐用部材を配置すると共に、特許請求の範囲に於ける(
イ)トド)の関係を保つ様にした為、アフォーカル系角
倍率を小さくして、広角化を効果的に図る事が出来、例
えばワイド側画角を61.2゜もの超広角とする事が出
来ると共に、その広角化に伴って生ずる諸収差を全変倍
域に亘り良好に補正する事が出来、又第■群の有効径を
小さくしてコンパクト化を図る事が出来、そうして例え
ば3倍ズームでは焦点距離7〜21mm、6倍ズームで
は焦点距離6.5〜39關であって、口径比が約1:1
.2(Fナンバー−1,2)迄も可能な非常に明るいズ
ームレンズを提供出来るものである。Further, in relation to the above-mentioned optical path branching member, an optical path branching member is arranged between the first group to the first group and the second group in the afocal system of the first group to the second group. In(
b) By maintaining the above relationship, it is possible to reduce the afocal angular magnification and effectively widen the angle of view. For example, the wide-side angle of view can be made as ultra-wide as 61.2°. At the same time, various aberrations that occur due to the wide angle can be well corrected over the entire zoom range, and the effective diameter of the second lens group can be made smaller to make it more compact. For example, a 3x zoom has a focal length of 7 to 21 mm, a 6x zoom has a focal length of 6.5 to 39 mm, and the aperture ratio is approximately 1:1.
.. This makes it possible to provide a very bright zoom lens that can reach up to 2 (F number -1, 2).
第1図は本発明のズームレンズの第1実施例を示す構成
図、第2図、第3図、第4図はその収差曲線図、第5図
は第2実施例を示す構成図、第6図、第7図、第8図は
その収差曲線図である。FIG. 1 is a block diagram showing the first embodiment of the zoom lens of the present invention, FIGS. 2, 3, and 4 are aberration curve diagrams thereof, and FIG. 5 is a block diagram showing the second embodiment. 6, 7, and 8 are aberration curve diagrams thereof.
Claims (1)
G3の3枚レンズからなり、G1 は物体に向って凸な
る負メニスカスレンズ、G2 は曲事大なる面を物体
側に向けた正レンズで、G1 と02 は適当な間隔を
保っている。 G3は物体に向って凸なる正メニスカスレンズである。 第■群は負の屈折力を有し、04〜G603枚レンズか
らなり、G4 は物体に向って凸なる負メニスカスレン
ズ、G5は曲率犬なる凹面を像側に向けた負レンズ、G
6 は物体に向って凸なる正メニスカスレンズで、G5
と66 は適当な間隔を保っている。 第■群は負の屈折力を有し、物体に向って凹なる負メニ
スカスレンズである。 第■群は正の屈折力を有し、固定された1枚又は2枚の
レンズからなる。 第■群と第■群の間に光路分岐用部材、例えばプリズム
、ミラー等を配置する。 第■群乃至第■群でアフォーカル系を構成し、その後方
に枚数のレンズからなる固定された結像レンズ、すなわ
ち第V群を配置する。 第1群、第■群、第■群の光軸方向の移動により、夫々
第1群は有限物体に対する結像作用、第■群は変倍作用
、第■群は第■群の移動により生ずる焦点移動の補正作
用がある。 上記ズームレンズ系に於て、 fl、f■;夫々第■群及び第■群の焦点距離r:順順
次各折折面曲率半径 d;順次各面間軸上間隔 ■a :広角端と望遠端のアフォーカル系角倍率の相乗
平均 とした時、 (イ)0.6≦Va≦0.8 (ロ)0.05≦d2/f■≦0.12 ←→ 0.6≦(1/r2 i/rl)fI≦0.9に
)0.8≦(1/ r4 + 1/ r5 ) fl(
+i0.05≦d1o/1fIII≦0.10(−)0
.6≦(1/r7+1/rB+1/rg) Iful(
)) 0.4≦(1/ rl 1−1/ riS! )
l fll j≦0.7なる関係を保つ事を特徴とす
るズームレンズ。[Claims] 1 Sequentially from the front, the first group has a positive refractive power, 01-
It consists of three G3 lenses, G1 is a negative meniscus lens convex toward the object, G2 is a positive lens with its curved surface facing the object, and G1 and 02 are kept at an appropriate distance. G3 is a positive meniscus lens that is convex toward the object. Group Ⅰ has negative refractive power and consists of three lenses from 04 to G60, G4 is a negative meniscus lens that is convex toward the object, G5 is a negative lens with a concave surface of curvature facing toward the image side, and G
6 is a positive meniscus lens convex toward the object, G5
and 66 maintain appropriate spacing. The second group is a negative meniscus lens that has negative refractive power and is concave toward the object. The second group has positive refractive power and consists of one or two fixed lenses. An optical path branching member such as a prism, a mirror, etc. is arranged between the 2nd group and the 2nd group. The afocal system is composed of the groups (1) to (2), and a fixed imaging lens consisting of several lenses, that is, the V-th group, is arranged behind the afocal system. By moving the 1st group, 2nd group, and 2nd group in the optical axis direction, the 1st group has an imaging effect on a finite object, the 2nd group has a variable magnification effect, and the 2nd group has a movement of the 2nd group. It has the effect of correcting focus movement. In the above zoom lens system, fl, f■; Focal length r of the second group and second group, respectively; R: Radius of curvature of each folding surface d; Sequential axial spacing between each surface ■a: Wide-angle end and telephoto When taken as the geometric mean of the afocal system angular magnification at the edge, (a) 0.6≦Va≦0.8 (b) 0.05≦d2/f■≦0.12 ←→ 0.6≦(1/ r2 i/rl) fI≦0.9) 0.8≦(1/ r4 + 1/ r5 ) fl(
+i0.05≦d1o/1fIII≦0.10(-)0
.. 6≦(1/r7+1/rB+1/rg) Iful(
)) 0.4≦(1/rl 1-1/riS!)
A zoom lens characterized by maintaining the relationship: l fll j≦0.7.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11946078A JPS5833533B2 (en) | 1978-09-28 | 1978-09-28 | zoom lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11946078A JPS5833533B2 (en) | 1978-09-28 | 1978-09-28 | zoom lens |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5545077A JPS5545077A (en) | 1980-03-29 |
JPS5833533B2 true JPS5833533B2 (en) | 1983-07-20 |
Family
ID=14761901
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11946078A Expired JPS5833533B2 (en) | 1978-09-28 | 1978-09-28 | zoom lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5833533B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57135912A (en) * | 1981-02-16 | 1982-08-21 | Asahi Optical Co Ltd | Zoom lens |
JPS58108511A (en) * | 1981-12-22 | 1983-06-28 | Asahi Optical Co Ltd | Light zoom lens |
JPS58153913A (en) * | 1982-03-08 | 1983-09-13 | Canon Inc | Zoom lens |
JPS58214120A (en) * | 1982-06-07 | 1983-12-13 | Nippon Kogaku Kk <Nikon> | Zoom lens |
-
1978
- 1978-09-28 JP JP11946078A patent/JPS5833533B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5545077A (en) | 1980-03-29 |
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