JP3258375B2 - Small two-group zoom lens - Google Patents
Small two-group zoom lensInfo
- Publication number
- JP3258375B2 JP3258375B2 JP16335192A JP16335192A JP3258375B2 JP 3258375 B2 JP3258375 B2 JP 3258375B2 JP 16335192 A JP16335192 A JP 16335192A JP 16335192 A JP16335192 A JP 16335192A JP 3258375 B2 JP3258375 B2 JP 3258375B2
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- Japan
- Prior art keywords
- lens
- negative
- lens component
- component
- positive
- Prior art date
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、負の屈折力を有する前
群と正の屈折力を有する後群の２つのレンズ群から成る
ズームレンズにおいて、特に、レンズ構成枚数を少なく
したズームレンズに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a zoom lens comprising a front lens group having a negative refractive power and a rear lens group having a positive refractive power, and more particularly to a zoom lens having a reduced number of lenses. .
【０００２】[0002]
【従来の技術】従来より、上記のタイプのズームレンズ
は、１眼レフレックスカメラ用の交換レンズとして、標
準画角をふくむ、いわゆる標準ズームレンズとして広く
利用されてきた。このタイプのレンズ系は、負の屈折力
を有する前群と正の屈折力を有する後群の２つのレンズ
群を離して配置する、レトロフォーカスの近軸配置を構
成しているから、１眼レフレックスカメラのクイックリ
ターンミラーを装着するに必要な、長いバックフォーカ
スを確保し易く、全体にコンパクトにまとまる上、良好
な性能を得ることが容易である。2. Description of the Related Art Conventionally, the above-mentioned type of zoom lens has been widely used as an interchangeable lens for a single-lens reflex camera as a so-called standard zoom lens having a standard angle of view. This type of lens system constitutes a retrofocus paraxial arrangement in which two lens groups, a front group having a negative refractive power and a rear group having a positive refractive power, are separated from each other. It is easy to secure a long back focus necessary for mounting the quick return mirror of the reflex camera, and it is easy to obtain a good performance in addition to being compact as a whole.
【０００３】このような負・正の２群ズームタイプにお
いて、構成枚数を少なくした従来例としては、特開昭５
９−６４８１１号があげられる。このレンズ系は、およ
そ３５〜７０mmの焦点距離を持つズームレンズである
が、前群を２群２枚、後群を４群４枚にて構成し、前群
に非球面を用いることにより収差補正を行なっている。In such a negative / positive two-unit zoom type, a conventional example in which the number of components is reduced is disclosed in
No. 9-64811. This lens system is a zoom lens having a focal length of about 35 to 70 mm. However, the front group is composed of two groups, and the rear group is composed of four groups. Correction has been made.
【０００４】更に、枚数を削減した例として、特開平４
−４６３０８号がある。このレンズ系は、およそ３５〜
７０mm前後の焦点距離をもつズームレンズにおいて、前
群を２群２枚、後群も２群２枚もしくは３群３枚にて構
成したものであり、４面以上の非球面を使用して収差補
正を行なっている。Further, as an example in which the number of sheets is reduced, see Japanese Patent Application Laid-Open
No. -46308. This lens system is about 35-
In a zoom lens having a focal length of about 70 mm, the front group is composed of two groups, and the rear group is also composed of two groups, or three or three groups. Aberrations using four or more aspheric surfaces Correction has been made.
【０００５】一方、このタイプのレンズ系をレンズシャ
ッターカメラに適用した例として、特開昭６２−５０７
１８号があげられる。レンズシャッターカメラでは、バ
ックフォーカスを長くする必要がないためその分、全長
短縮が可能であるが、後群の構成を正の屈折力と負の屈
折力を離して配置する、いわゆるテレフォトの近軸配置
とすることによって一層の全長短縮を図っている。この
従来例のレンズ系はおよそ、３５〜７０mmの焦点距離を
もち、前群を３群３枚、後群を４群６枚にて構成し、前
・後群を非球面化することにより収差補正を行なってい
る。On the other hand, as an example of applying this type of lens system to a lens shutter camera, see Japanese Patent Application Laid-Open No. 62-507.
No. 18 is mentioned. With a lens shutter camera, it is not necessary to lengthen the back focus, so the overall length can be shortened accordingly.However, the so-called telephoto paraxial arrangement in which the rear group is arranged with a positive refractive power and a negative refractive power separated from each other The arrangement reduces the overall length even further. The lens system of this conventional example has a focal length of about 35 to 70 mm, the front group is composed of three elements in three groups, the rear group is composed of six elements in four groups, and the front and rear groups are aspherical. Correction has been made.
【０００６】[0006]
【発明が解決しようとする問題点】特開昭５９−６４８
１１号のレンズ系は、全系でも６枚構成となっており枚
数は少なくなっているものの、各群への屈折力配分の設
定上、前群の有効径が大きくなってしまい、コンパクト
さの点で好ましくない。更に、前群に含まれる２枚のレ
ンズは有効径が大きいために、その材料費・加工費とも
に高くなってしまい好ましくない。特に、広角端の焦点
距離を短くして、より広角化を図った場合に、その欠点
が顕著になる。SUMMARY OF THE INVENTION Problems to be Solved by the Invention
Although the lens system of No. 11 has a total of six lenses and the number of lenses is small, the effective diameter of the front group becomes large due to the setting of the refractive power distribution to each group. It is not preferable in respect of the point. Furthermore, since the two lenses included in the front group have a large effective diameter, both material cost and processing cost are undesirably high. In particular, when the focal length at the wide-angle end is shortened to achieve a wider angle, the disadvantage becomes significant.
【０００７】又、特開平４−４６３０８号のレンズ系
は、全系でも４枚ないし５枚構成となっているものの、
収差補正状況は実用に耐えうるものではない。The lens system disclosed in Japanese Patent Application Laid-Open No. 4-46308 has a total of four or five lenses.
The aberration correction situation is not practical.
【０００８】特開昭６２−５０７１８号のレンズ系は、
全長、有効径ともに小型化されているものの、全系で９
枚ものレンズが使われており、コスト的に好ましくな
い。本発明は、負の屈折力を有する前群と正の屈折力を
有する後群からなる２群ズームレンズにおいて、構成枚
数を減らすことを主目的としながらも、十分なコンパク
トさと高性能を維持した広画角で高変倍比のズームレン
ズを提供することを目的としている。[0008] The lens system disclosed in Japanese Patent Application Laid-Open No.
Although the overall length and effective diameter are both smaller, 9
As many lenses are used, which is not preferable in terms of cost. The present invention has a main object of reducing the number of components in a two-unit zoom lens including a front unit having a negative refractive power and a rear unit having a positive refractive power, while maintaining sufficient compactness and high performance. The objective is to provide a zoom lens with a wide angle of view and a high zoom ratio.
【０００９】[0009]
【課題を解決するための手段】本発明のズームレンズ
は、負の屈折力を有する前群と正の屈折力を有する後群
にて構成され、両群間の間隔を変化させて変倍するズー
ムレンズにおいて、後群が物体側より順に、正のレンズ
成分と負のレンズ成分と負のレンズ成分にて構成され、
且つ、前記後群の前記正のレンズ成分を単レンズまたは
接合レンズとし、前記負のレンズ成分のうち物体側の負
のレンズ成分を単レンズまたは接合レンズとし、他方の
負のレンズ成分を単レンズにて構成し、これらいずれか
の負のレンズ成分が少なくとも１面の非球面を有するレ
ンズ系で、下記条件（１），（２）を満足する。 （１） １＜｜ｆ 1 ｜／ｆ W ＜２ （２） ０．７＜ｆ 2 ／ｆ W ＜１．４ 但し、ｆ 1 ，ｆ 2 は夫々前群，後群の焦点距離、ｆ W は
広角端における全系焦点距離である。 SUMMARY OF THE INVENTION A zoom lens according to the present invention comprises a front lens group having a negative refractive power and a rear lens group having a positive refractive power.
The zoom that changes the distance between both groups to change the magnification
Lens, the rear group is a positive lens in order from the object side.
Component, a negative lens component and a negative lens component,
And, the positive lens component of the rear group is a single lens or
As a cemented lens, of the negative lens components,
Lens component is a single lens or a cemented lens,
The negative lens component is composed of a single lens, and any of these
The negative lens component has at least one aspheric surface.
In the lens system, the following conditions (1) and (2) are satisfied. (1) 1 <| f 1 | / f W <2 (2) 0.7 <f 2 / f W <1.4 where, f 1, f 2 are respectively front group, the rear group of the focal length, f W Is
This is the focal length of the entire system at the wide-angle end.
【００１０】本発明は、レンズ構成枚数を極力減らすこ
とを目的としているが、単に枚数を減らしては収差の悪
化を招くのみであり、収差補正の自由度をも損なうこと
になる。そのために高性能を維持しながら、どのように
枚数を減らすかが問題になってくる。An object of the present invention is to reduce the number of lens components as much as possible. However, simply reducing the number of lenses only causes deterioration of aberrations, and also impairs the degree of freedom of aberration correction. Therefore, the problem is how to reduce the number of sheets while maintaining high performance.
【００１１】本発明は、負の屈折力を有する前群と正の
屈折力を有する後群のうち、よりパワーの強い後群を正
のレンズ成分と負のレンズ成分と負のレンズ成分の三つ
の成分にて構成した。これらレンズ成分のうち、最も物
体側の正のレンズ成分は後群に入射する発散光束を収斂
させて球面収差の補正を可能にし、又二つの負のレンズ
成分はこれら負のレンズ成分中に少なくとも１面含まれ
ている非球面とあいまって色収差および軸外収差、特
に、非点収差，歪曲収差を良好に補正している。According to the present invention, of the front group having a negative refractive power and the rear group having a positive refractive power, the rear group having higher power is divided into a positive lens component, a negative lens component, and a negative lens component. It consisted of two components. Of these lens components, the most positive lens component on the object side converges the divergent light beam incident on the rear group to enable correction of spherical aberration, and the two negative lens components have at least two of these negative lens components. The chromatic aberration and the off-axis aberration, in particular, the astigmatism and the distortion are well corrected in combination with the aspherical surface included in one surface.
【００１２】一方、いくら構成枚数を少なくしてコスト
ダウンを達成したとしても、レンズ系が巨大なものにな
っては商品価値がない。そこで、前記した少ない枚数の
レンズ構成にて、十分なコンパクトさと高性能を達成す
るためには、まず、前・後群に適切な屈折力配分を与え
ることが好ましい。そのために前記の構成の本発明のレ
ンズ系において上記の条件（１），（２）を満足するこ
とが望ましい。On the other hand, no matter how much the number of components is reduced to achieve cost reduction, there is no commercial value if the lens system becomes huge. Therefore, in order to achieve sufficient compactness and high performance with the small number of lenses described above, first, it is preferable to give an appropriate refractive power distribution to the front and rear groups. Therefore, it is desirable that the lens system of the present invention having the above-described configuration satisfy the above conditions (1) and (2).
【００１３】既に、良く知られているように、負・正の
２群ズームタイプは中間焦点距離ｆS ［ｆS ＝（ｆW ・
ｆT ）1/2 但し、ｆW ，ｆT は各々、広角端、望遠端に
おける全系焦点距離である。］にて、後群が等倍結像と
なる場合に、変倍に伴う前群の移動量が最小となる。本
発明では、前群の移動量を少なくすることと収差補正の
可能性を考慮して、条件（１）を満足するようにして、
中間焦点距離付近から広角端の間に、後群の等倍結像位
置があるようにしている。従って、条件（１）の上限を
こえると、自ずから前群の移動量が大きくなり、更に、
前・後群の間隔が広がるため前群の有効径が大きくなり
好ましくない。また、条件（１）の下限をこえると、少
ないレンズ構成枚数では十分な収差補正が出来ない。As is well known, the negative / positive two-group zoom type has an intermediate focal length f S [f S = (f W.
f T ) 1/2 where f W and f T are the total focal length at the wide-angle end and the telephoto end, respectively. ], When the rear unit forms an image at the same magnification, the amount of movement of the front unit due to zooming is minimized. In the present invention, the condition (1) is satisfied in consideration of the reduction in the amount of movement of the front group and the possibility of aberration correction.
The same-magnification imaging position of the rear group is set between the vicinity of the intermediate focal length and the wide-angle end. Therefore, when the value exceeds the upper limit of the condition (1), the movement amount of the front group naturally increases, and further,
Since the distance between the front and rear groups increases, the effective diameter of the front group increases, which is not preferable. If the lower limit of the condition (1) is exceeded, sufficient aberration correction cannot be performed with a small number of lens components.
【００１４】条件（２）は、後群の変倍に伴う移動量と
収差補正の可能性から設定された。後群の屈折力が強い
程、移動量を少なくできるが、条件（２）の下限を越え
て後群の屈折力が強くなると本発明のレンズ構成では十
分な収差補正が出来なくなる。一方、条件（２）の上限
を越えて後群の屈折力が弱くなると移動量が大きくなる
上に、前・後群の間隔が広がるため前群の有効径が大き
くなり好ましくない。The condition (2) is set based on the amount of movement and the possibility of correcting aberrations associated with zooming of the rear unit. The stronger the refractive power of the rear group, the smaller the amount of movement can be. However, if the refractive power of the rear group is increased beyond the lower limit of the condition (2), sufficient aberration correction cannot be performed with the lens configuration of the present invention. On the other hand, if the upper limit of the condition (2) is exceeded and the refractive power of the rear group is weakened, the amount of movement is increased, and the effective diameter of the front group is increased because the distance between the front and rear groups is widened.
【００１５】更に、良好な収差補正を達成するために、
後群中の負レンズ成分を非球面化することが重要である
が、このとき非球面の形状が、光軸から離れるに従って
徐々に負の屈折力を強めるような非球面形状であること
が望ましい。 Further, in order to achieve good aberration correction,
It is important to make the negative lens component in the rear group aspherical. At this time, the shape of the aspherical surface must be such that the negative refractive power gradually increases as the distance from the optical axis increases.
Is desirable.
【００１６】又、本発明のズームレンズにおいて、前記
後群中の最も物体側の正のレンズ成分の焦点距離をｆR1
とすると下記条件（４）を満足するようにすることが好
ましい。 （４） ０．５＜ｆR1／ｆ2 ＜１．０ 本発明のレンズ系は、前群から射出した光線が負のパワ
ーにて発散光束となって後群へ入射する。この発散光束
は後群の正のパワーによって像面へ収斂されるが、その
収斂作用の全てを後群中の正のレンズ成分に負担させて
いる。そのために条件（４）の上限を越えると負のレン
ズ成分のパワ−が零になる。従って条件（４）の上限を
越えることはない。又、条件（４）の下限を越えると後
群中の正のレンズ成分のパワ−強くな成りすぎて充分な
収差補正ができなくなる。In the zoom lens of the present invention, the focal length of the most object-side positive lens component in the rear group is f R1.
In this case, it is preferable to satisfy the following condition (4). (4) 0.5 <f R1 / f 2 < 1.0 In the lens system of the present invention, light rays emitted from the front group become divergent light beams with a negative power and enter the rear group. This divergent light beam is converged on the image plane by the positive power of the rear unit, but all of the converging action is imposed on the positive lens component in the rear unit. Therefore, when the value exceeds the upper limit of the condition (4), the power of the negative lens component becomes zero. Therefore, the upper limit of the condition (4) is not exceeded. If the lower limit of the condition (4) is exceeded, the power of the positive lens component in the rear group will be so strong that sufficient aberration correction cannot be performed.
【００１７】更に、後群中の正のレンズ成分のアッベ数
が下記条件（５）を満足することが望ましい。 （５） ７０＜νR1 ただし、νR1 は後群中の正のレンズ成分のアッベ数で
この正のレンズ成分が接合レンズ等の場合は、正レンズ
および負レンズ等、含まれる全てのレンズのアッベ数の
和とする。Further, it is desirable that the Abbe number of the positive lens component in the rear group satisfies the following condition (5). (5) 70 <ν R1 where , ν R1 is the Abbe number of the positive lens component in the rear group, and when this positive lens component is a cemented lens or the like, all the lenses included such as the positive lens and the negative lens are included. The sum of Abbe numbers.
【００１８】後述の実施例にもあるように、負のレンズ
成分のパワ−は必ずしも強くなくとも良い。したがっ
て、負のレンズ成分のパワ−が強くなくても変倍に伴う
色収差の変動を抑えるためには後群中の正のレンズ成分
で発生する色収差を小さくしておく必要がある。そのた
めに上記の条件（５）を満足することが望ましい。As will be described later, the power of the negative lens component is not necessarily required to be strong. Therefore, even if the power of the negative lens component is not strong, it is necessary to reduce the chromatic aberration generated by the positive lens component in the rear lens group in order to suppress the variation of the chromatic aberration due to zooming. Therefore, it is desirable to satisfy the above condition (5).
【００１９】一方、本発明のレンズ系において、前群は
物体側より順に、負のレンズ成分と正のレンズ成分にて
構成し、少なくとも１面の非球面を有することが望まし
い。On the other hand, in the lens system according to the present invention, it is desirable that the front unit is composed of, in order from the object side, a negative lens component and a positive lens component, and has at least one aspheric surface.
【００２０】[0020]
【００２１】更に、レンズ系全長をコンパクトになすた
め以下の条件（８）を満足することが望ましい。 （８） ０．２＜ｆBW／ＩＨ＜１ ただしｆBWは広角端におけるバックフォーカス、ＩＨは
画面対角長である。条件（８）の上限を越えてバックフ
ォーカスが長くなると、第１面から像面までの距離も長
くなり、それにともなってカメラ厚も厚くなりがちなた
め好ましくない。条件（８）の下限を越えてバックフォ
ーカスが短くなると、全長短縮には有利だが、後群中の
像面側にあるレンズの径が大きくなりコンパクト化およ
びコスト上好ましくない。 Further, in order to make the overall length of the lens system compact, it is desirable to satisfy the following condition (8). (8) 0.2 <f BW / IH <1 where f BW is the back focus at the wide angle end, and IH is the screen diagonal length. If the back focus becomes longer than the upper limit of the condition (8), the distance from the first surface to the image plane becomes longer, and the thickness of the camera tends to increase accordingly. If the back focus is shorter than the lower limit of the condition (8), it is advantageous for shortening the overall length, but the diameter of the lens on the image plane side in the rear group becomes large, which is not preferable in terms of compactness and cost.
【００２２】[0022]
【実施例】次に本発明の小型の２群ズームレンズの各実
施例を示す。 実施例１ ｆ＝28〜44.3〜70mm ，Ｆ／4.6 〜Ｆ／5.78〜Ｆ／7.64 ｆB ＝34.3〜47.0〜67.1mm ，２ω＝75.30° 〜51.99° 〜34.30 ° ｒ1 ＝67.7540 ｄ1 ＝1.8000 ｎ1 ＝1.79952 ν1 ＝42.24 ｒ2 ＝14.1700 (非球面)ｄ2 ＝6.0000 ｒ3 ＝20.7220 ｄ3 ＝4.0000 ｎ2 ＝1.84666 ν2 ＝23.78 ｒ4 ＝32.6080 ｄ4 ＝Ｄ ｒ5 ＝∞（絞り） ｄ5 ＝1.0000 ｒ6 ＝14.8240 (非球面)ｄ6 ＝5.4700 ｎ3 ＝1.58913 ν3 ＝61.18 ｒ7 ＝-21.3360 ｄ7 ＝1.5000 ｎ4 ＝1.74077 ν4 ＝27.79 ｒ8 ＝-110.5550 ｄ8 ＝7.2300 ｒ9 ＝-51.8190 ｄ9 ＝1.8000 ｎ5 ＝1.69680 ν5 ＝55.52 ｒ10＝-239.2890 ｄ10＝2.5600 ｒ11＝-34.0540(非球面)ｄ11＝1.8000 ｎ6 ＝1.49241 ν6 ＝57.66 ｒ12＝-40.2100(非球面) 非球面係数 （ｒ2 面）Ｐ＝0.6360，Ａ4 ＝0.22340 ×10-5，Ａ6 ＝0.15985 ×10-7 Ａ8 ＝-0.89313×10-10 ，Ａ10＝0 （ｒ6 面）Ｐ＝1.0000，Ａ4 ＝-0.25333×10-5，Ａ6 ＝0.28475 ×10-7 Ａ8 ＝-0.11140×10-8，Ａ10＝0.14457 ×10-10 （ｒ11面）Ｐ＝0.9989，Ａ4 ＝-0.34820×10-3 ，Ａ6 ＝-0.25868×10-5 Ａ8 ＝0.51062 ×10-8 ，Ａ10＝0 （ｒ12面）Ｐ＝1.0000，Ａ4 ＝-0.21561×10-3 ，Ａ6 ＝-0.13920×10-5 Ａ8 ＝0.18243 ×10-7 ，Ａ10＝0 ｆ 28 44.3 70 Ｄ 29.574 13.056 2.638 ｜ｆ 1 ｜／ｆ W ＝1.43 ，ｆ 2 ／ｆ W ＝1.12 ｆ R1 ／ｆ 2 ＝0.82，ν R1 ＝88.97 ，ｆ BW / IH＝0.80 実施例２ ｆ＝28〜44.3〜70mm ，Ｆ／4.6 〜Ｆ／5.78〜Ｆ／7.65 ｆB ＝28.0〜39.4〜57.3mm ，２ω＝75.30° 〜51.99° 〜34.30 ° ｒ1 ＝102.0380 ｄ1 ＝1.8000 ｎ1 ＝1.80610 ν1 ＝40.95 ｒ2 ＝15.4510 (非球面)ｄ2 ＝5.5100 ｒ3 ＝22.9950 ｄ3 ＝4.1000 ｎ2 ＝1.80518 ν2 ＝25.43 ｒ4 ＝45.5240 ｄ4 ＝Ｄ ｒ5 ＝∞（絞り） ｄ5 ＝1.0000 ｒ6 ＝12.5750 (非球面)ｄ6 ＝5.5000 ｎ3 ＝1.58313 ν3 ＝59.36 ｒ7 ＝-23.9680 ｄ7 ＝1.5000 ｎ4 ＝1.74077 ν4 ＝27.79 ｒ8 ＝∞ ｄ8 ＝7.5700 ｒ9 ＝-56.8360(非球面)ｄ9 ＝1.8000 ｎ5 ＝1.72916 ν5 ＝54.68 ｒ10＝635.4610 ｄ10＝4.5600 ｒ11＝-41.4020 ｄ11＝1.8000 ｎ6 ＝1.69680 ν6 ＝55.52 ｒ12＝-56.3110(非球面) 非球面係数 （ｒ2 面）Ｐ＝0.6289，Ａ4 ＝0.27458 ×10-6，Ａ6 ＝0.89015 ×10-8 Ａ8 ＝-0.71846×10-10 ，Ａ10＝0 （ｒ6 面）Ｐ＝1.0000，Ａ4 ＝-0.44084×10-5，Ａ6 ＝-0.43704×10-7 Ａ8 ＝0.75813 ×10-9，Ａ10＝0 （ｒ9 面）Ｐ＝0.9982，Ａ4 ＝-0.15417×10-3 ，Ａ6 ＝-0.86017×10-6 Ａ8 ＝-0.21284×10-7 ，Ａ10＝0 （ｒ12面）Ｐ＝1.0000，Ａ4 ＝-0.18827×10-4 ，Ａ6 ＝-0.13806×10-6 Ａ8 ＝0.21554 ×10-9 ，Ａ10＝0 ｆ 28 44.3 70 Ｄ 32.290 14.188 2.771 ｜ｆ 1 ｜／ｆ W ＝1.59 ，ｆ 2 ／ｆ W ＝1.11 ｆ R1 ／ｆ 2 ＝0.79，ν R1 ＝87.15 , f BW / IH=0.65 実施例３ ｆ＝35〜49.5〜70mm ，Ｆ／4.6 〜Ｆ／5.42〜Ｆ／6.58 ｆB ＝36.5〜45.6〜58.4mm ，２ω＝63.36° 〜47.15° 〜34.30 ° ｒ1 ＝240.6810 ｄ1 ＝1.8000 ｎ1 ＝1.80610 ν1 ＝40.95 ｒ2 ＝21.5360 (非球面)ｄ2 ＝6.9200 ｒ3 ＝31.2160 ｄ3 ＝3.9200 ｎ2 ＝1.80518 ν2 ＝25.43 ｒ4 ＝65.5500 ｄ4 ＝Ｄ ｒ5 ＝∞（絞り） ｄ5 ＝1.0000 ｒ6 ＝15.0920 (非球面)ｄ6 ＝6.0700 ｎ3 ＝1.58313 ν3 ＝59.36 ｒ7 ＝-24.3260 ｄ7 ＝1.5000 ｎ4 ＝1.74077 ν4 ＝27.79 ｒ8 ＝-168.6280 ｄ8 ＝5.6800 ｒ9 ＝-53.2690 ｄ9 ＝1.8000 ｎ5 ＝1.72916 ν5 ＝54.68 ｒ10＝-120.3020 ｄ10＝4.5600 ｒ11＝-113.6740(非球面)ｄ11＝1.8000 ｎ6 ＝1.49241 ν6 ＝57.66 ｒ12＝88.9710 (非球面) 非球面係数 （ｒ2 面）Ｐ＝0.7823，Ａ4 ＝-0.12430×10-5，Ａ6 ＝0.20857 ×10-8 Ａ8 ＝-0.19934×10-10 ，Ａ10＝0 （ｒ6 面）Ｐ＝1.0000，Ａ4 ＝-0.22122×10-5，Ａ6 ＝-0.74253×10-8 Ａ8 ＝0.24774 ×10-9，Ａ10＝0 （ｒ11面）Ｐ＝1.0000，Ａ4 ＝-0.37379×10-3 ，Ａ6 ＝-0.33626×10-6 Ａ8 ＝-0.47026×10-8 ，Ａ10＝0 （ｒ12面）Ｐ＝1.0000，Ａ4 ＝-0.26163×10-3 ，Ａ6 ＝0.57877 ×10-6 Ａ8 ＝0.35854 ×10-8 ，Ａ10＝0 ｆ 35 49.5 70 Ｄ 32.119 14.747 2.466 ｜ｆ 1 ｜／ｆ W ＝1.64 ，ｆ 2 ／ｆ W ＝1.03 ｆ R1 ／ｆ 2 ＝0.76，ν R1 ＝87.15 ，f BW / IH=0.85 実施例４ ｆ＝28〜44.3〜70mm ，Ｆ／4.6 〜Ｆ／5.79〜Ｆ／7.68 ｆB ＝40.0〜53.5〜74.8mm ，２ω＝75.30° 〜51.99° 〜34.30 ° ｒ1 ＝64.9860 (非球面)ｄ1 ＝1.8000 ｎ1 ＝1.78590 ν1 ＝44.18 ｒ2 ＝13.6870 (非球面)ｄ2 ＝6.6000 ｒ3 ＝21.6840 ｄ3 ＝4.1000 ｎ2 ＝1.80518 ν2 ＝25.43 ｒ4 ＝35.7490 ｄ4 ＝Ｄ ｒ5 ＝∞（絞り） ｄ5 ＝1.0000 ｒ6 ＝13.2490 (非球面)ｄ6 ＝9.4600 ｎ3 ＝1.49700 ν3 ＝81.61 ｒ7 ＝-81.0620 ｄ7 ＝1.0800 ｒ8 ＝-60.2680 ｄ8 ＝1.8000 ｎ4 ＝1.75520 ν4 ＝27.51 ｒ9 ＝87.0610 ｄ9 ＝2.9900 ｎ5 ＝1.64000 ν5 ＝60.09 ｒ10＝-63.0520 ｄ10＝1.9400 ｒ11＝-33.4450(非球面)ｄ11＝1.8000 ｎ6 ＝1.69350 ν6 ＝50.81 ｒ12＝-94.4320 非球面係数 （ｒ1 面）Ｐ＝1.0000，Ａ4 ＝-0.60799×10-5，Ａ6 ＝0.95516 ×10-8 Ａ8 ＝-0.39330×10-11 ，Ａ10＝0 （ｒ2 面）Ｐ＝0.6280，Ａ4 ＝-0.86532×10-5，Ａ6 ＝-0.87852×10-8 Ａ8 ＝0.14244 ×10-9，Ａ10＝0 （ｒ6 面）Ｐ＝1.0000，Ａ4 ＝0.98394 ×10-5 ，Ａ6 ＝0.66957 ×10-7 Ａ8 ＝0.86781 ×10-9 ，Ａ10＝-0.52146×10-11 （ｒ11面）Ｐ＝0.8618，Ａ4 ＝-0.85415×10-4 ，Ａ6 ＝-0.42285×10-6 Ａ8 ＝-0.72431×10-8 ，Ａ10＝0 ｆ 28 44.3 70 Ｄ 29.964 13.528 3.163 ｜ｆ 1 ｜／ｆ W ＝1.39 ，ｆ 2 ／ｆ W ＝1.15 ｆ R1 ／ｆ 2 ＝0.74 ，ν R1 ＝81.61 f BW / IH=0.93 ただしｒ1 ，ｒ2 ，・・・ はレンズ各面の曲率半
径、ｄ1 ，ｄ2 ，・・・ は各レンズの肉厚およびレ
ンズ間隔、ｎ1 ，ｎ2 ，・・・ は各レンズの屈折
率、ν1 ，ν2 ，・・・ は各レンズのアッベ数であ
る。Next, embodiments of a small two-unit zoom lens according to the present invention will be described. Example 1 f = 28~44.3~70mm, F / 4.6 ~F / 5.78~F / 7.64 f B = 34.3~47.0~67.1mm, 2ω = 75.30 ° ~51.99 ° ~34.30 ° r 1 = 67.7540 d 1 = 1.8000 n 1 = 1.79952 v 1 = 42.24 r 2 = 14.1700 (aspherical surface) d 2 = 6.0000 r 3 = 20.7220 d 3 = 4.0000 n 2 = 1.84666 v 2 = 23.78 r 4 = 32.6080 d 4 = Dr 5 = 5 (aperture) ) d 5 = 1.0000 r 6 = 14.8240 ( aspherical) d 6 = 5.4700 n 3 = 1.58913 ν 3 = 61.18 r 7 = -21.3360 d 7 = 1.5000 n 4 = 1.74077 ν 4 = 27.79 r 8 = -110.5550 d 8 = 7.2300 r 9 = -51.8190 d 9 = 1.8000 n 5 = 1.69680 v 5 = 55.52 r 10 = -239.2890 d 10 = 2.5600 r 11 = -34.0540 (aspherical surface) d 11 = 1.8000 n 6 = 1.49241 v 6 = 57.66 r 12 = -40.2100 (aspherical surface) Aspherical surface coefficient (r 2 surface) P = 0.6360, A 4 = 0.22340 × 10 -5 , A 6 = 0.15985 × 10 -7 A 8 = -0.89313 × 10 -10 , A 10 = 0 (R 6 surface) P = 1.000, A 4 = −0.25333 × 10 −5 , A 6 = 0.28475 × 10 −7 A 8 = -0.11140 × 10 -8, A 10 = 0.14457 × 10 -10 (r 11 surface) P = 0.9989, A 4 = -0.34820 × 10 -3, A 6 = -0.25868 × 10 -5 A 8 = 0.51062 × 10 -8, A 10 = 0 ( r 12 surface) P = 1.0000, A 4 = -0.21561 × 10 -3, A 6 = -0.13920 × 10 -5 A 8 = 0.18243 × 10 -7, A 10 = 0 f 28 44.3 70 D 29.574 13.056 2.638 | f 1 | / f W = 1.43, f 2 / f W = 1.12 f R1 / f 2 = 0.82, ν R1 = 88.97, f BW / IH = 0.80 example 2 f =. 28 to 44.3~70mm, F / 4.6 ~F / 5.78~F / 7.65 f B = 28.0~39.4~57.3mm, 2ω = 75.30 ° ~51.99 ° ~34.30 ° r 1 = 102.0380 d 1 = 1.8000 n 1 = 1.80610 ν 1 = 40.95 r 2 = 15.4510 (aspherical surface) d 2 = 5.5100 r 3 = 22.9950 d 3 = 4.1000 n 2 = 1.80518 ν 2 = 25.43 r 4 = 45.5240 d 4 = D r 5 = ∞ (aperture) d 5 = 1.0000 r 6 = 12.5750 (aspherical) d 6 = 5.5000 n 3 = 1.58313 ν 3 = 59.36 r 7 = -23.9680 d 7 = 1.5000 n 4 = 1.74077 ν 4 = 27.79 r 8 = ∞ 8 = 7.5700 r 9 = -56.8360 (aspherical) d 9 = 1.8000 n 5 = 1.72916 ν 5 = 54.68 r 10 = 635.4610 d 10 = 4.5600 r 11 = -41.4020 d 11 = 1.8000 n 6 = 1.69680 ν 6 = 55.52 r 12 = -56.3110 (aspherical) aspherical coefficients (r 2 surface) P = 0.6289, A 4 = 0.27458 × 10 -6, A 6 = 0.89015 × 10 -8 A 8 = -0.71846 × 10 -10, A 10 = 0 (r 6 plane) P = 1.0000, A 4 = −0.44084 × 10 −5 , A 6 = −0.43704 × 10 −7 A 8 = 0.75813 × 10 −9 , A 10 = 0 (r 9 plane) P = 0.9982 , A 4 = -0.15417 × 10 -3 , A 6 = -0.86017 × 10 -6 A 8 = -0.21284 × 10 -7, A 10 = 0 (r 12 surface) P = 1.0000, A 4 = -0.18827 × 10 −4 , A 6 = −0.13806 × 10 −6 A 8 = 0.21554 × 10 −9 , A 10 = 0 f 28 44.3 70 D 32.290 14.188 2.771 | f 1 | / f W = 1.59, f 2 / f W = 1.11 f R1 / f 2 = 0.79, ν R1 = 87.15, f BW / IH = 0.65 example 3 f = 35~49.5~70mm, F / 4.6 ~F / 5.42~F / 6.58 f B = 36.5~45.6~58.4mm , 2ω = 63.3 6 ° to 47.15 ° to 34.30 ° r 1 = 240.6810 d 1 = 1.8000 n 1 = 1.80610 ν 1 = 40.95 r 2 = 21.5360 (aspherical surface) d 2 = 6.9200 r 3 = 31.2160 d 3 = 3.9200 n 2 = 1.80518 ν 2 = 25.43 r 4 = 65.5500 d 4 = D r 5 = ∞ (aperture) d 5 = 1.0000 r 6 = 15.0920 (aspheric surface) d 6 = 6.0700 n 3 = 1.58313 ν 3 = 59.36 r 7 = -24.3260 d 7 = 1.5000 n 4 = 1.74077 v 4 = 27.79 r 8 = -168.6280 d 8 = 5.6800 r 9 = -53.2690 d 9 = 1.8000 n 5 = 1.72916 v 5 = 54.68 r 10 = -120.3020 d 10 = 4.5600 r 11 = -113.6740 (non spherical) d 11 = 1.8000 n 6 = 1.49241 ν 6 = 57.66 r 12 = 88.9710 ( aspherical) aspherical coefficients (r 2 surface) P = 0.7823, A 4 = -0.12430 × 10 -5, A 6 = 0.20857 × 10 -8 A 8 = -0.19934 × 10 -10 , A 10 = 0 (r 6 plane) P = 1.0000, A 4 = -0.22122 × 10 -5 , A 6 = -0.74253 × 10 -8 A 8 = 0.24774 × 10 -9, A 10 = 0 (r 11 surface) P = 1.0000, A 4 = -0.37379 × 10 -3, A 6 = -0.33626 × 10 -6 A 8 = -0.47026 × 10 -8, A 10 = 0 (r 12 surface) P = 1.0000, A 4 = -0.26163 × 10 -3, A 6 = 0.57877 × 10 -6 A 8 = 0.35854 × 10 -8, A 10 = 0 f 35 49.5 70 D 32.119 14.747 2.466 | f 1 | / f W = 1.64, f 2 / f W = 1.03 f R1 / f 2 = 0.76, ν R1 = 87.15, f BW / IH = 0.85 example 4 f = 28~44.3~70mm, F / 4.6 ~F / 5.79~F / 7.68 f B = 40.0~53.5~74.8mm, 2ω = 75.30 ° ~51.99 ° ~34.30 ° r 1 = 64.9860 ( aspherical) d 1 = 1.8000 n 1 = 1.78590 v 1 = 44.18 r 2 = 13.6870 (aspherical surface) d 2 = 6.6000 r 3 = 21.6840 d 3 = 4.1000 n 2 = 1.80518 v 2 = 25.43 r 4 = 35.7490 d 4 = D r 5 = ∞ (stop) d 5 = 1.0000 r 6 = 13.2490 ( aspherical) d 6 = 9.4600 n 3 = 1.49700 ν 3 = 81.61 r 7 = -81.0620 d 7 = 1.0800 r 8 = -60.2680 d 8 = 1.8000 n 4 = 1.75520 ν 4 = 27.51 r 9 = 87.0610 d 9 = 2.9900 n 5 = 1.64000 ν 5 = 60.09 r 10 = -63.0520 d 10 = 1.9400 r 11 -33.4450 (aspherical) d 11 = 1.8000 n 6 = 1.69350 ν 6 = 50.81 r 12 = -94.4320 aspherical coefficients (r 1 surface) P = 1.0000, A 4 = -0.60799 × 10 -5, A 6 = 0.95516 × 10 −8 A 8 = −0.39330 × 10 −11 , A 10 = 0 (r 2 surface) P = 0.6280, A 4 = −0.86532 × 10 −5 , A 6 = −0.87852 × 10 −8 A 8 = 0.14244 × 10 -9 , A 10 = 0 (r 6 plane) P = 1.0000, A 4 = 0.98394 × 10 -5 , A 6 = 0.6957 × 10 -7 A 8 = 0.86781 × 10 -9 , A 10 = -0.52146 × 10 -11 (r 11 plane) P = 0.8618, A 4 = -0.85415 × 10 -4 , A 6 = -0.42285 × 10 -6 A 8 = -0.72431 × 10 -8 , A 10 = 0 f 28 44.3 70 D 29.964 13.528 3.163 | f 1 | / f W = 1.39, f 2 / f W = 1.15 f R1 / f 2 = 0.74, ν R1 = 81.61 f BW / IH = 0.93 where r 1, r 2, ··· the lens each radius of curvature, d 1, d 2, ··· wall thickness and lens distance of each lens, n 1, n 2, ··· is the refractive index of each lens, ν 1, ν 2, ··· is each This is the Abbe number of the lens.
【００２３】上記実施例１乃至実施例４は、夫々図１乃
至図４に示す構成である。これら実施例の前群は、いず
れも物体側から順に負レンズと正レンズとよりなる２群
２枚構成であり、１面乃至２面の非球面を有している。
又後群は、正のレンズ成分と、負のレンズ成分と負のレ
ンズ成分とよりなり、そのうち正のレンズ成分は、単レ
ンズの場合と接合レンズの場合との二通りあり、また物
体側の第１の負のレンズ成分も単レンズの場合と接合レ
ンズの場合との二通りある。又第２の負のレンズ成分は
全て単レンズである。 The first to fourth embodiments have the configurations shown in FIGS. 1 to 4, respectively. Each of the front units in these examples is a two-unit, two-unit structure including a negative lens and a positive lens in order from the object side, and has one or two aspheric surfaces.
The rear group consists of a positive lens component, a negative lens component, and a negative lens component. Of these, the positive lens component has two types, a single lens case and a cemented lens case. The first negative lens component also has two types, a single lens case and a cemented lens case. All the second negative lens components are single lenses .
【００２４】また、実施例は、ガラス材料およびプラス
チック材料を使用している。特に実施例１のようにパワ
−の弱いレンズにプラスチックを用いれば、温度・湿度
変化の影響を余り強く受けずにプラスチック材料を利用
出来る。The embodiment uses a glass material and a plastic material. In particular, if plastic is used for a lens having a low power as in Embodiment 1, a plastic material can be used without being affected by changes in temperature and humidity.
【００２５】上記実施例中に用いられている非球面の形
状は、光軸上光の進行方向にＺ軸を、光軸と直交する方
向にＹ軸をとった時次の式で表わされる。 The shape of the aspherical surface used in the above embodiment is expressed by the following equation when the Z axis is taken in the traveling direction of light on the optical axis and the Y axis is taken in a direction perpendicular to the optical axis.
【００２６】ただし、ｒは近軸曲率半径、Ｐ，Ａ４ ，
Ａ６ ，Ａ８ ，Ａ１０は非球面係数である。又実施例
のデーター中に示すＹの値は、非球面量ΔＲ３，ΔＦ
を計算する時の有効半径を示す。Where r is the paraxial radius of curvature, P, A 4 ,
A 6 , A 8 and A 10 are aspherical coefficients. The value of Y shown in the data of the examples, the aspherical amount delta R3, delta F
Shows the effective radius when calculating.
【００２７】[0027]
【発明の効果】本発明のズームレンズは、負・正の２群
ズームタイプで、少ないレンズ枚数のコンパクトでしか
も高性能なレンズ系である。The zoom lens of the present invention is a two-group negative / positive zoom type, and is a compact and high-performance lens system with a small number of lenses.
【図１】実施例１の断面図FIG. 1 is a cross-sectional view of a first embodiment.
【図２】実施例２の断面図FIG. 2 is a sectional view of a second embodiment.
【図３】実施例３の断面図FIG. 3 is a cross-sectional view of a third embodiment.
【図４】実施例４の断面図FIG. 4 is a sectional view of a fourth embodiment.
【図５】実施例１の広角端における収差曲線図FIG. 5 is an aberration curve diagram at the wide angle end according to the first embodiment.
【図６】実施例１の中間焦点距離における収差曲線図FIG. 6 is an aberration curve diagram at the intermediate focal length according to the first embodiment.
【図７】実施例１の望遠端における収差曲線図FIG. 7 is an aberration curve diagram at the telephoto end according to the first embodiment.
【図８】実施例２の広角端における収差曲線図FIG. 8 is an aberration curve diagram at the wide angle end according to the second embodiment.
【図９】実施例２の中間焦点距離における収差曲線図FIG. 9 is an aberration curve diagram at the intermediate focal length according to the second embodiment.
【図１０】実施例２の望遠端における収差曲線図FIG. 10 is an aberration curve diagram at a telephoto end according to a second embodiment.
【図１１】実施例３の広角端における収差曲線図FIG. 11 is an aberration curve diagram at the wide angle end according to the third embodiment.
【図１２】実施例３の中間焦点距離における収差曲線図FIG. 12 is an aberration curve diagram at the intermediate focal length according to the third embodiment.
【図１３】実施例３の望遠端における収差曲線図FIG. 13 is an aberration curve diagram at the telephoto end according to the third embodiment.
【図１４】実施例４の広角端における収差曲線図FIG. 14 is an aberration curve diagram at the wide angle end according to the fourth embodiment.
【図１５】実施例４の中間焦点距離における収差曲線図FIG. 15 is an aberration curve diagram at the intermediate focal length according to the fourth embodiment.
【図１６】実施例４の望遠端における収差曲線図FIG. 16 is an aberration curve diagram at the telephoto end in Example 4.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 9/00 - 17/08 G02B 21/02 - 21/04 G02B 25/00 - 25/04 ──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. 7 , DB name) G02B 9/00-17/08 G02B 21/02-21/04 G02B 25/00-25/04
Claims (4)
する後群にて構成され、両群間の間隔を変化させて変倍
するズームレンズにおいて、後群が物体側より順に、正
のレンズ成分と負のレンズ成分と負のレンズ成分にて構
成され、且つ、前記後群の前記正のレンズ成分を単レン
ズまたは接合レンズとし、前記負のレンズ成分のうち物
体側の負のレンズ成分を単レンズまたは接合レンズと
し、他方の負のレンズ成分を単レンズにて構成し、これ
らいずれかの負のレンズ成分が少なくとも１面の非球面
を有し、下記条件（１），（２）を満足するズームレン
ズ。 （１） １＜｜ｆ1 ｜／ｆW ＜２ （２） ０．７＜ｆ2 ／ｆW ＜１．４ 但し、ｆ1 ，ｆ2 は夫々前群，後群の焦点距離、ｆW は
広角端における全系焦点距離である。1. A zoom lens system comprising a front group having a negative refractive power and a rear group having a positive refractive power, wherein the distance between the two groups is changed to change the magnification. A positive lens component, a negative lens component, and a negative lens component, and the positive lens component of the rear group is a single lens or a cemented lens, and the negative lens component on the object side of the negative lens component Is a single lens or a cemented lens, and the other negative lens component is a single lens, and any one of these negative lens components has at least one aspheric surface. A zoom lens that satisfies (2). (1) 1 <| f 1 | / f W <2 (2) 0.7 <f 2 / f W <1.4 where, f 1, f 2 are respectively front group, the rear group of the focal length, f W Is the total focal length at the wide-angle end.
する後群にて構成され、両群間の間隔を変化させて変倍
するズームレンズにおいて、後群が物体側より順に、正
のレンズ成分と負のレンズ成分と負のレンズ成分にて構
成され、且つ、前記後群の前記正のレンズ成分を単レン
ズまたは接合レンズとし、前記負のレンズ成分のうち物
体側の負のレンズ成分を単レンズまたは接合レンズと
し、他方の負のレンズ成分を単レンズにて構成し、これ
らいずれかの負のレンズ成分が少なくとも１面の非球面
を有し、前記後群中の最も物体側の正のレンズ成分の焦
点距離をｆR1とするとき、下記条件（４）を満足するこ
とを特徴とするズームレンズ。 （４） ０．５＜ｆR1／ｆ2 ＜１．０ ただし、ｆ2 は後群の焦点距離である。2. A zoom lens system comprising a front group having a negative refractive power and a rear group having a positive refractive power, wherein the distance between the two groups is changed to change the magnification. A positive lens component, a negative lens component, and a negative lens component, and the positive lens component of the rear group is a single lens or a cemented lens, and the negative lens component on the object side of the negative lens component Is a single lens or a cemented lens, and the other negative lens component is a single lens, and any one of these negative lens components has at least one aspheric surface, and A zoom lens characterized by satisfying the following condition (4) when a focal length of a positive lens component on the object side is f R1 . (4) 0.5 <f R1 / f 2 <1.0 where a focal length of f 2 is the rear group.
する後群にて構成され、両群間の間隔を変化させて変倍
するズームレンズにおいて、後群が物体側より順に、正
のレンズ成分と負のレンズ成分と負のレンズ成分にて構
成され、且つ、前記後群の前記正のレンズ成分を単レン
ズまたは接合レンズとし、前記負のレンズ成分のうち物
体側の負のレンズ成分を単レンズまたは接合レンズと
し、他方の負のレンズ成分を単レンズにて構成し、これ
らいずれかの負のレンズ成分が少なくとも１面の非球面
を有し、前記後群中の正のレンズ成分のアッベ数が下記
条件（５）を満足することを特徴とするズームレンズ。 （５） ７０＜νR1 ただし、νR1は前記後群中の正のレンズ成分のアッベ数
でこのレンズ成分が接合レンズの場合は、含まれる全て
のレンズのアッベ数の和とする。3. A zoom lens system comprising a front group having a negative refractive power and a rear group having a positive refractive power, wherein the distance between the two groups is changed to change the magnification. A positive lens component, a negative lens component, and a negative lens component, and the positive lens component of the rear group is a single lens or a cemented lens, and the negative lens component on the object side of the negative lens component Is a single lens or a cemented lens, and the other negative lens component is a single lens, and any one of these negative lens components has at least one aspheric surface, and the positive lens component in the rear group. Wherein the Abbe number of the lens component satisfies the following condition (5): (5) 70 <ν R1 where ν R1 is the Abbe number of the positive lens component in the rear group, and when this lens component is a cemented lens, it is the sum of the Abbe numbers of all the included lenses.
分と正のレンズ成分にて構成し、少なくとも１面の非球
面を有することを特徴とする請求項１、２又は３のズー
ムレンズ。4. A zoom system according to claim 1, wherein said front unit is composed of a negative lens component and a positive lens component in order from the object side, and has at least one aspherical surface. lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16335192A JP3258375B2 (en) | 1992-06-01 | 1992-06-01 | Small two-group zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16335192A JP3258375B2 (en) | 1992-06-01 | 1992-06-01 | Small two-group zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05346542A JPH05346542A (en) | 1993-12-27 |
| JP3258375B2 true JP3258375B2 (en) | 2002-02-18 |
Family
ID=15772239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16335192A Expired - Fee Related JP3258375B2 (en) | 1992-06-01 | 1992-06-01 | Small two-group zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3258375B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772938A (en) * | 2016-12-21 | 2017-05-31 | 信华精机有限公司 | A kind of undistorted wide-angle lens |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3331011B2 (en) * | 1993-07-08 | 2002-10-07 | オリンパス光学工業株式会社 | Small two-group zoom lens |
| JPH08152558A (en) * | 1993-11-25 | 1996-06-11 | Asahi Optical Co Ltd | Zoom lens |
| JP4453120B2 (en) * | 1999-06-17 | 2010-04-21 | 株式会社ニコン | Zoom lens |
| JP3833218B2 (en) * | 2004-02-13 | 2006-10-11 | 株式会社長野光学研究所 | 2 group zoom lens |
| TWI438471B (en) | 2011-08-24 | 2014-05-21 | Largan Precision Co Ltd | Optical image capturing lenses |
| TWI463169B (en) | 2013-07-25 | 2014-12-01 | Largan Precision Co Ltd | Image lens assembly and image capturing device |
| TWI644141B (en) | 2016-10-14 | 2018-12-11 | 大立光電股份有限公司 | Optical imaging module, image capturing apparatus and electronic device |
| TWI616700B (en) | 2017-04-17 | 2018-03-01 | 大立光電股份有限公司 | Optical image capturing lens assembly, imaging apparatus and electronic device |
-
1992
- 1992-06-01 JP JP16335192A patent/JP3258375B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772938A (en) * | 2016-12-21 | 2017-05-31 | 信华精机有限公司 | A kind of undistorted wide-angle lens |
| CN106772938B (en) * | 2016-12-21 | 2020-01-14 | 信华精机有限公司 | Distortion-free wide-angle lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05346542A (en) | 1993-12-27 |
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