JP3087185B2 - Small zoom lens including wide angle - Google Patents
Small zoom lens including wide angleInfo
- Publication number
- JP3087185B2 JP3087185B2 JP03103380A JP10338091A JP3087185B2 JP 3087185 B2 JP3087185 B2 JP 3087185B2 JP 03103380 A JP03103380 A JP 03103380A JP 10338091 A JP10338091 A JP 10338091A JP 3087185 B2 JP3087185 B2 JP 3087185B2
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- JP
- Japan
- Prior art keywords
- lens
- zoom lens
- refractive power
- zoom
- angle
- Prior art date
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Description
【０００１】[0001]
【産業上の利用分野】本発明はレンズシャッターカメラ
等に用いられる小型のズームレンズ、特にその変倍域が
広角を含むものに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small zoom lens used for a lens shutter camera or the like, and more particularly to a zoom lens having a wide zoom range.
【０００２】[0002]
【従来の技術】従来より、レンズシャッターカメラ用の
ズームレンズとしては、変倍比が２倍程度のものでは、
物体側より順に正の屈折力の前群と負の屈折力の後群を
配した２群ズーム方式が一般的である（例えば特開昭５
６−１２８９１１号公報参照）。この方式の特徴は、全
系で望遠型の構成となり、バックフォーカス及びレンズ
全長が短い、ということである。2. Description of the Related Art Conventionally, as a zoom lens for a lens shutter camera, if the zoom ratio is about twice,
In general, a two-unit zoom system in which a front group having a positive refractive power and a rear group having a negative refractive power are arranged in order from the object side (for example, Japanese Patent Laid-Open No.
No. 6-128911). The feature of this system is that the entire system has a telephoto configuration, and the back focus and the overall length of the lens are short.
【０００３】一方、近年のレンズシャッターカメラの動
向としては、広角化という傾向が見られ、前述の２群ズ
ーム方式を用いたものとして特開平２−２８４１０９号
公報記載のもの等が公知である。On the other hand, the trend of lens shutter cameras in recent years has been to increase the angle of view, and the one described in Japanese Patent Application Laid-Open No. 2-284109 is known as one using the above-described two-unit zoom system.
【０００４】[0004]
【発明が解決しようとする課題】しかし、従来の２群ズ
ーム方式では、周辺光量とバックフォーカスの確保に限
界があり、半画角が４０°程度あるいはそれを越えるよ
うな、従来のものよりも一層の広角化を達成すること
は、非常に困難であった。負群先行の２群ズーム方式を
用いればこの困難は解決されるが、このタイプは逆望遠
型でレンズ系の大型化が避けられないため、特に高変倍
化の必要がある場合を除いて、小型のカメラには不向き
である。However, in the conventional two-group zoom system, there is a limit in securing the peripheral light amount and the back focus, and the half-angle of view is about 40 ° or more. It was very difficult to achieve a wider angle. This difficulty can be solved by using the two-group zoom method that precedes the negative group. However, since this type is an inverse telephoto type and an unavoidable enlargement of the lens system, it is required unless a high zoom ratio is required. It is not suitable for small cameras.
【０００５】本発明は、正レンズ群先行の２群ズーム方
式を用いながら、周辺光量とバックフォーカスを確保
し、かつ性能も良好で、レンズシャッターカメラ等に好
適な、広角を含む小型のズームレンズを得ようとするも
のである。SUMMARY OF THE INVENTION The present invention provides a small zoom lens including a wide-angle lens, which secures a peripheral light amount and a back focus, has good performance, and is suitable for a lens shutter camera or the like, while using a two-unit zoom system preceding a positive lens group. It is trying to get.
【０００６】[0006]
【課題を解決するための手段】上記目的を達するため本
発明のズームレンズは、物体側より順に正の屈折力の第
１レンズ群と負の屈折力の第２レンズ群を有し、上記２
つのレンズ群の間隔を変化させることにより変倍を行う
ズームレンズにおいて、上記第１レンズ群を物体側より
順に負の屈折力の前側ユニットと正の屈折力の後側ユニ
ットにより構成し、かつ以下の条件を満足させる。 ０．４０＜｜φ1a｜・ｄab ＜１．２０ ・・・・ ただし、φ1a ： 第１レンズ群の中の負の前側ユニット
の屈折力 ｄab ： 第１レンズ群中の負の前側ユニットの第２主点
と正の後側ユニットの第１主点との間隔To achieve the above object, a zoom lens according to the present invention has a first lens unit having a positive refractive power and a second lens unit having a negative refractive power in order from the object side.
In a zoom lens that performs zooming by changing the distance between two lens groups, the first lens group includes a front unit having a negative refractive power and a rear unit having a positive refractive power in order from the object side, and Satisfies the condition. 0.40 <| φ 1 a | · dab <1.20 ···· However, phi 1 a: refractive power of the negative of the front unit in the first lens group dab: negative front in the first lens unit The distance between the second principal point of the unit and the first principal point of the positive rear unit
【０００７】本発明におけるズームレンズは、さらに次
の条件を満足することが望ましい。 ０．８０＜|φ1a|／φw＜１．５０ ・・・・ ０．８０＜ φ1a ／φ2＜１．５０ ・・・・ ただし、φw ：全系の広角端での屈折力 φ2 ：第２レンズ群の屈折力It is desirable that the zoom lens according to the present invention further satisfies the following conditions. 0.80 <| φ 1 a | / φw <1.50 ···· 0.80 <φ 1 a / φ 2 <1.50 ···· However, .phi.w: refractive power at the wide angle end of the entire system φ 2 : refractive power of the second lens group
【０００８】[0008]
【作用】第１群中の前側ユニットに負の屈折力を与える
ことにより、広角側で開口効率が大きくなり周辺光量が
確保できると共に、レンズ系が極端な望遠型となるのを
防ぎ、広角端で適度なバックフォーカスを確保すること
が可能となる。By providing a negative refractive power to the front unit in the first group, the aperture efficiency is increased on the wide-angle side, the peripheral light amount can be secured, and the lens system is prevented from being extremely telephoto. Thus, it is possible to secure an appropriate back focus.
【０００９】φ1、φ2をそれぞれ第１、第２レンズ群の
屈折力（ただしφ1＞０，φ2＜０） φw、φtをそれぞれ広角端、望遠端での全系の屈折力 ｄw、ｄtをそれぞれ広角端、望遠端での両レンズ群の間
隔 としたとき、広角端でのバックフォーカスｆbwは次式に
より表される。 ｆbw＝（１−φ1・ｄw）／φw ・・・・ 式から、φw が大きく、すなわち広角になればなる
程、ｆbwは小さくなることがわかる。また、合成屈折力
の式 φw ＝φ1＋φ2−φ1・φ2・ｄw ・・・・ φt ＝φ1＋φ2−φ1・φ2・ｄt ・・・・ より、次式が得られる。 （φw−φt）／（ｄw−ｄt）＝−φ1・φ2 ・・・・ 式から、ｆbwを適当な値に保つにはｄw を小さくすれ
ばよいことがわかるが、通常の構成では、レンズ厚みの
ためにｄt を小さくするには限界があるため、式中の
(ｄw−ｄt）も小さくなってしまい、｜φ1・φ2｜が大き
くなり収差補正が困難となる。ここにズームレンズの広
角化の難しさがある。Φ 1 and φ 2 are the refractive powers of the first and second lens groups, respectively (where φ 1 > 0, φ 2 <0). Φw and φt are the refractive powers dw of the entire system at the wide-angle end and the telephoto end, respectively. , Dt is the distance between both lens groups at the wide-angle end and the telephoto end, respectively, the back focus fbw at the wide-angle end is expressed by the following equation. from fbw = (1-φ 1 · dw) / φw ···· formula, φw is large, that is as it sounds if a wide angle, it can be seen that the fbw becomes smaller. Also, from the equation φw = φ 1 + φ 2 -φ 1 · φ 2 · dw ···· φt = φ 1 + φ 2 -φ 1 · φ 2 · dt ···· of composite refractive power, the following expression is obtained . (Φw-φt) / (dw -dt) = - from φ 1 · φ 2 ···· formula, but it is understood that it is sufficient small dw to keep fbw to a suitable value, in a typical configuration, Since there is a limit in reducing dt due to the thickness of the lens,
(dw-dt) also becomes small, and | φ 1 · φ 2 | becomes large, making it difficult to correct aberrations. Here is the difficulty of widening the zoom lens.
【００１０】本発明においては、第１レンズ群中の前側
ユニットを負レンズ群とすることにより、この困難を解
決している。図１に本発明のズームレンズの構成図を示
す。図中、Ｇ1、Ｇ2はそれぞれ第１、第２レンズ群を、
Ｇ1a、Ｇ1bはそれぞれ第１レンズ群中の前側ユニット、
後側ユニットを、Ｈ1'は第１レンズ群の第２主点を表し
ている。このような構成をとることにより、主点Ｈ1'を
後側レンズユニットＧ1b よりも像側に出すことがで
き、レンズ間隔ｄt としてより小さな値を与えることが
可能となっている。これにより(ｄw−ｄt)の値を適当に
保つことができ|φ1・φ2|が過大となって収差補正が困
難となることもない。In the present invention, this difficulty is solved by making the front unit in the first lens unit a negative lens unit. FIG. 1 shows a configuration diagram of a zoom lens according to the present invention. In the figure, G 1 and G 2 represent the first and second lens groups, respectively.
G 1 a, G 1 b the front unit of each of the first lens group,
In the rear unit, H 1 ′ represents the second principal point of the first lens group. By adopting such a configuration, the principal point H 1 ′ can be brought closer to the image side than the rear lens unit G 1 b, and a smaller value can be given as the lens interval dt. As a result, the value of (dw-dt) can be appropriately maintained, and | φ 1 · φ 2 | does not become excessively large, so that it becomes difficult to correct aberration.
【００１１】Ｇ1bとＨ1'の軸上間隔をｘとすると、ｘは
次式により表される。 ｘ＝−φ1a・ｄab／φ1 ・・・・ この式は、|φ1a|・ｄab を大きくすることにより、Ｈ
1'はより像側へ移動することを示している。そこで本発
明においては式の条件を満足させる。この式の下限
をこえるとｘが小さくなって本発明の効果が薄れ、バッ
クフォーカスを保ったままで収差を良好に補正すること
が困難となる。また上限をこえるとレンズ系は逆望遠型
に近づき、コンパクト性が失われる。Assuming that an on-axis interval between G 1 b and H 1 ′ is x, x is represented by the following equation. x = −φ 1 a · dab / φ 1 ... This equation is obtained by increasing | φ 1 a |
1 'indicates that the image moves further to the image side. Therefore, in the present invention, the condition of the expression is satisfied. If the lower limit of this expression is exceeded, x becomes small, and the effect of the present invention is weakened, and it becomes difficult to satisfactorily correct the aberration while maintaining the back focus. When the upper limit is exceeded, the lens system approaches the reverse telephoto type, and the compactness is lost.
【００１２】式は、第１レンズ群中の前側ユニットの
屈折力に関するものであり、下限をこえて｜φ1a|が小
さくなると、広角側での開口効率が小さくなり周辺光量
を確保することが難しくなる。また上限をこえて大きく
なると、レンズ系は逆望遠型に近づき、コンパクト性が
失われる。The equation relates to the refractive power of the front unit in the first lens unit. When | φ 1 a | is smaller than the lower limit, the aperture efficiency on the wide-angle side is reduced, and the amount of peripheral light is secured. Becomes difficult. When the lens system is larger than the upper limit, the lens system approaches the reverse telephoto type, and the compactness is lost.
【００１３】さらに式は第１レンズ群中の前側ユニッ
トと第２レンズ群の屈折力のバランスを適当に保ち、軸
外収差を良好に補正するための条件である。下限をこえ
ると第２レンズ群で発生する収差が支配的となり、広角
側で糸巻き型の歪曲が大きくなる。また上限をこえると
第１レンズ群中の前側ユニットで発生する収差が支配的
となり、やはり広角側でたる型の歪曲が大きくなる。Further, the expression is a condition for properly maintaining the balance between the refractive powers of the front unit and the second lens unit in the first lens unit and favorably correcting off-axis aberrations. If the lower limit is exceeded, the aberration generated in the second lens group becomes dominant, and the pincushion type distortion increases on the wide angle side. When the value exceeds the upper limit, the aberration generated in the front unit in the first lens group becomes dominant, and the barrel distortion on the wide-angle side also increases.
【００１４】[0014]
【実施例】以下、本発明の実施例を示す。表中、ｆは全
系の焦点距離、ＦはＦナンバー、ωは半画角、Ｒは近軸
曲率半径、Ｄは軸上面間隔、Ｎはｄ線に対するレンズ材
料の屈折率、νはアッベ数である。また＊印は非球面を
表し、その形状は面の頂点を原点として光軸方向をＸ軸
とした直交座標系において、頂点曲率をｃ、円錐係数を
Ｋ、非球面係数をＡi（ｉ＝４、６、８）として下記の
数式１で表わされる。Embodiments of the present invention will be described below. In the table, f is the focal length of the entire system, F is the F number, ω is the half angle of view, R is the paraxial radius of curvature, D is the distance between the upper surfaces of the axes, N is the refractive index of the lens material with respect to the d line, and ν is the Abbe number It is. In addition, an asterisk (*) represents an aspheric surface, and its shape is represented by an abscissa coordinate system in which the vertex of the surface is the origin and the optical axis direction is the X axis, the vertex curvature is c, the cone coefficient is K, and the aspheric surface coefficient is Ai (i = 4). , 6, 8) by the following equation 1.
【００１５】[0015]
【数１】 (Equation 1)
【００１６】実施例１ 非球面係数 第７面 第１３面 Ｋ ＝ ０ Ｋ ＝ ０ Ａ4 ＝−０．１３６４４×１０-4 Ａ4 ＝−０．７１７３０×１０-6 Ａ6 ＝−０．４２３７２×１０-7 Ａ6 ＝−０．７３９４７×１０-8 Ａ8 ＝−０．１７０６３×１０-9 Ａ8 ＝−０．２７８４３×１０-9 |φ1a|ｄab＝０．９３ |φ1a|／φw＝１．３８ φ1a／φ2＝１．３３Embodiment 1 Aspherical coefficients seventh surface thirteenth surface K = 0 K = 0 A 4 = -0.13644 × 10 -4 A 4 = -0.71730 × 10 -6 A 6 = −0.42372 × 10 −7 A 6 = −0.73947 × 10 −8 A 8 = −0.17063 × 10 −9 A 8 = −0.27843 × 10 −9 | φ 1 a | dab = 0.93 | φ 1 a | /φw=1.38 φ 1 a / φ 2 = 1.33
【００１７】実施例２ 非球面係数 第７面 Ｋ ＝−８．１５８１ Ａ4 ＝−０．５８８２１×１０-5 Ａ6 ＝−０．５８７１３×１０-6 Ａ8 ＝ ０．３８５７１×１０-8 |φ1a|ｄab＝０．６８ |φ1a|／φw＝１．２８
φ1a／φ2＝１．３８Embodiment 2Aspheric coefficient seventh surface K = −8.1581 AFour= −0.58821 × 10-Five A6= −0.58713 × 10-6 A8= 0.38571 x 10-8 | φ1a | dab = 0.68 | φ1a | /φw=1.28
φ1a / φTwo= 1.38
【００１８】実施例３ 非球面係数 第７面 第１４面 Ｋ ＝−１３．９０７ Ｋ ＝ ０．１７０９９ Ａ4 ＝ −０．９５８９０×１０-5 Ａ4 ＝ ０．１３７７３×１０-5 Ａ6 ＝ −０．５４５５３×１０-6 Ａ6 ＝−０．２４１２５×１０-6 Ａ8 ＝ ０．６７１１５×１０-8 Ａ8 ＝ ０．４３２９３×１０-10 |φ1a|ｄab＝０.５９ |φ1a|／φw＝１.１８ φ1a／φ2＝１.３２Embodiment 3 Aspherical coefficients seventh surface fourteenth surface K = -13.907 K = 0.17099 A 4 = -0.95890 × 10 -5 A 4 = 0.13773 × 10 -5 A 6 = −0.54553 × 10 −6 A 6 = −0.24125 × 10 −6 A 8 = 0.67115 × 10 −8 A 8 = 0.43293 × 10 −10 | φ 1 a | dab = 0.59 | φ 1 a | /φw=1.18 φ 1 a / φ 2 = 1.32.
【００１９】実施例４ 非球面係数 第９面 Ｋ ＝−６．５１４３ Ａ4 ＝−０．６７４３５×１０-5 Ａ6 ＝−０．５９０４２×１０-6 Ａ8 ＝ ０．３９４０４×１０-8 |φ1a|ｄab＝０.６２ |φ1a|／φw＝１.０６ φ1
a／φ2＝１.００Embodiment 4Aspherical surface coefficient ninth surface K = -6.5143 AFour= −0.67435 × 10-Five A6= −0.59042 × 10-6 A8= 0.39404 × 10-8 | φ1a | dab = 0.62 | φ1a | /φw=1.06 φ1
a / φTwo= 1.00
【００２０】第１、４実施例では負の前側ユニットＧ1a
を２枚の負レンズにより構成し、広角側での負の歪曲の
発生を抑えている。第２、３実施例では、前側ユニット
Ｇ1aはいずれも１枚の負レンズにより構成されている。
絞りから離れているＧ1aは必然的に径が大きくなるた
め、これを１枚のレンズで構成することはコスト面で有
利であり、軽量化にもつながる。このうち第３実施例で
は、絞りもＧ1bの内部に配し、前玉すなわち前側ユニッ
トＧ1aの小型化を図っている。また上記実施例ではいず
れもＧ1b中の正レンズに、軸外で正の屈折力が弱くなる
ような非球面を用いて、全ズーム域にわたって球面収差
及びコマ収差を補正している。In the first and fourth embodiments, the negative front unit G 1 a
Is composed of two negative lenses to suppress the occurrence of negative distortion on the wide-angle side. In second and third embodiment, the front unit G 1 a is configured by any one negative lens.
G 1 a that is remote from the aperture for inevitably diameter increases, it is advantageous in cost to configure this one lens, also leads to weight reduction. Of these, in the third embodiment, the aperture is also disposed inside G 1 b to reduce the size of the front lens, that is, the front unit G 1 a. The positive lens in G 1 b in both in the above embodiment, by using an aspherical surface, such as positive refractive power outside the axis is weakened, and corrects spherical aberration and coma aberration over the entire zoom range.
【００２１】本発明のズームレンズは、その実施例及び
各収差図に見るように、コンパクトで、半画角が３５°
以上の広角を含む変倍域を有しながら、バックフォーカ
ス及び周辺光量の確保が容易であり、しかも各収差がバ
ランスよく補正され、レンズシャッターカメラ等の小型
のカメラに搭載するのに適したものとなっている。The zoom lens according to the present invention is compact and has a half angle of view of 35 ° as shown in the embodiment and each aberration diagram.
While having a variable magnification range including the above-mentioned wide angle, it is easy to secure back focus and peripheral light amount, and each aberration is corrected in a well-balanced manner, suitable for mounting on small cameras such as lens shutter cameras. It has become.
【図１】本発明のズームレンズの構成を示す屈折力配置
図FIG. 1 is a refractive power layout diagram showing a configuration of a zoom lens according to the present invention.
【図２】本発明のズームレンズの第１実施例の断面図FIG. 2 is a sectional view of a first embodiment of the zoom lens according to the present invention;
【図３】本発明のズームレンズの第２実施例の断面図FIG. 3 is a sectional view of a second embodiment of the zoom lens according to the present invention;
【図４】本発明のズームレンズの第３実施例の断面図FIG. 4 is a sectional view of a third embodiment of the zoom lens according to the present invention;
【図５】本発明のズームレンズの第４実施例の断面図FIG. 5 is a sectional view of a fourth embodiment of the zoom lens according to the present invention;
【図６】本発明のズームレンズの第１実施例の広角端に
おける収差図FIG. 6 is an aberration diagram at a wide-angle end of a first embodiment of the zoom lens according to the present invention;
【図７】本発明のズームレンズの第１実施例の中間部に
おける収差図FIG. 7 is an aberration diagram at an intermediate portion of the first embodiment of the zoom lens according to the present invention;
【図８】本発明のズームレンズの第１実施例の望遠端に
おける収差図FIG. 8 is an aberration diagram at a telephoto end of a first embodiment of the zoom lens according to the present invention;
【図９】本発明のズームレンズの第２実施例の広角端に
おける収差図FIG. 9 is an aberration diagram at a wide-angle end of a second embodiment of the zoom lens according to the present invention;
【図１０】本発明のズームレンズの第２実施例の中間部
における収差図FIG. 10 is an aberration diagram at an intermediate portion of a zoom lens according to a second embodiment of the present invention.
【図１１】本発明のズームレンズの第２実施例の望遠端
における収差図FIG. 11 is an aberration diagram at a telephoto end of a second embodiment of the zoom lens according to the present invention;
【図１２】本発明のズームレンズの第３実施例の広角端
における収差図FIG. 12 is an aberration diagram at a wide-angle end of a third embodiment of the zoom lens according to the present invention;
【図１３】本発明のズームレンズの第３実施例の中間部
における収差図FIG. 13 is an aberration diagram at an intermediate portion of a third embodiment of the zoom lens according to the present invention;
【図１４】本発明のズームレンズの第３実施例の望遠端
における収差図FIG. 14 is an aberration diagram at a telephoto end of a third embodiment of the zoom lens according to the present invention;
【図１５】本発明のズームレンズの第４実施例の広角端
における収差図FIG. 15 is an aberration diagram at a wide-angle end of a fourth embodiment of the zoom lens according to the present invention;
【図１６】本発明のズームレンズの第４実施例の中間部
における収差図FIG. 16 is an aberration diagram at an intermediate portion of a fourth embodiment of the zoom lens according to the present invention;
【図１７】本発明のズームレンズの第４実施例の望遠端
における収差図FIG. 17 is an aberration diagram at a telephoto end of a fourth embodiment of the zoom lens according to the present invention;
収差図中、「ｄ」、「ｇ」はそれぞれｄ線、ｇ線に対す
る球面収差、「△Ｓ」、「△Ｍ」はそれぞれサジタル像
面、メリディオナル像面を表している。In the aberration diagrams, “d” and “g” represent spherical aberration with respect to d-line and g-line, respectively, and “ΔS” and “ΔM” represent a sagittal image plane and a meridional image plane, respectively.
フロントページの続き (56)参考文献 特開 平３−185412（ＪＰ，Ａ) 特開 平３−158815（ＪＰ，Ａ) 特開 平３−158814（ＪＰ，Ａ) 特開 平４−42114（ＪＰ，Ａ) 特開 平３−274519（ＪＰ，Ａ) 特開 平２−50118（ＪＰ，Ａ) 特開 昭63−276013（ＪＰ，Ａ) 特開 平３−261906（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 9/00 - 17/08 Continuation of the front page (56) References JP-A-3-185412 (JP, A) JP-A-3-158815 (JP, A) JP-A-3-158814 (JP, A) JP-A-4-42114 (JP) JP-A-3-274519 (JP, A) JP-A-2-50118 (JP, A) JP-A-62-276013 (JP, A) JP-A-3-261906 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) G02B 9/00-17/08
Claims (2)
ズ群と負の屈折力の第２レンズ群を有し、上記２つのレ
ンズ群の間隔を変化させることにより変倍を行うズーム
レンズにおいて、上記第１レンズ群を物体側より順に、
負の屈折力の前側ユニットと正の屈折力の後側ユニット
により構成し、かつ以下の条件を満足することを特徴と
する広角を含む小型のズームレンズ ０．４０＜｜φ1a｜・ｄab ＜１．２０ ただし、φ1a ： 第１レンズ群の中の負の前側ユニット
の屈折力 ｄab ： 第１レンズ群中の負の前側ユニットの第２主点
と正の後側ユニットの第１主点との間隔1. A zoom having a first lens group having a positive refractive power and a second lens group having a negative refractive power in order from the object side, and performing zooming by changing the distance between the two lens groups. In the lens, the first lens group is sequentially arranged from the object side.
A small zoom lens including a wide-angle lens, comprising a front unit having a negative refractive power and a rear unit having a positive refractive power, and satisfying the following conditions: 0.40 <| φ 1 a | · dab <1.20 where φ 1 a is the refractive power of the negative front unit in the first lens group dab is the second principal point of the negative front unit and the first of the positive rear unit in the first lens group. Distance from principal point
請求項１の広角を含む小型のズームレンズ ０．８０＜|φ1a|／φw＜１．５０ ただし、φw ：全系の広角端での屈折力2. A compact zoom lens 0.80, including a wide-angle of claim 1, characterized by satisfying the following condition <| φ 1 a | / φw <1.50 However, .phi.w: angle of the entire system Power at the edge
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03103380A JP3087185B2 (en) | 1991-04-09 | 1991-04-09 | Small zoom lens including wide angle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03103380A JP3087185B2 (en) | 1991-04-09 | 1991-04-09 | Small zoom lens including wide angle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07110445A JPH07110445A (en) | 1995-04-25 |
| JP3087185B2 true JP3087185B2 (en) | 2000-09-11 |
Family
ID=14352486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03103380A Expired - Fee Related JP3087185B2 (en) | 1991-04-09 | 1991-04-09 | Small zoom lens including wide angle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3087185B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3495618B2 (en) * | 1998-11-04 | 2004-02-09 | ペンタックス株式会社 | Zoom lens system |
| JP3435364B2 (en) * | 1998-12-24 | 2003-08-11 | ペンタックス株式会社 | Zoom lens system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0250118A (en) * | 1988-05-02 | 1990-02-20 | Ricoh Co Ltd | Zoom lens |
| JP2900487B2 (en) * | 1990-03-26 | 1999-06-02 | ミノルタ株式会社 | Compact zoom lens |
| JPH03185412A (en) * | 1989-12-15 | 1991-08-13 | Canon Inc | Zoom lens with simplified constitution |
| JP2623871B2 (en) * | 1989-11-17 | 1997-06-25 | キヤノン株式会社 | Zoom lens with simple configuration |
| JP2811828B2 (en) * | 1989-11-17 | 1998-10-15 | キヤノン株式会社 | Zoom lens having simple configuration and camera having the same |
| JP3067163B2 (en) * | 1990-06-07 | 2000-07-17 | ミノルタ株式会社 | Compact zoom lens |
-
1991
- 1991-04-09 JP JP03103380A patent/JP3087185B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07110445A (en) | 1995-04-25 |
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