JP4839763B2 - Wide angle lens - Google Patents
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- JP4839763B2 JP4839763B2 JP2005285394A JP2005285394A JP4839763B2 JP 4839763 B2 JP4839763 B2 JP 4839763B2 JP 2005285394 A JP2005285394 A JP 2005285394A JP 2005285394 A JP2005285394 A JP 2005285394A JP 4839763 B2 JP4839763 B2 JP 4839763B2
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Description
本発明は、バックフォーカスが大きく大画角を有する広角レンズに関する。 The present invention relates to a wide-angle lens having a large back focus and a large angle of view.
従来、通常の射影方式（ｙ＝ｆ・ｔａｎθ）で包括角（画角）２ω＝９０°を越える広角レンズが提案されている（例えば、特許文献１,２を参照。）。
しかしながら上記従来の広角レンズは、大型でフィルターサイズも大きく、レンズの構成枚数も多いという問題がある。また、イメージサークルが小さいという問題もある。 However, the conventional wide-angle lens has a problem that it is large, has a large filter size, and has a large number of lenses. There is also a problem that the image circle is small.
そこで本発明は上記問題点に鑑みてなされたものであり、包括角（画角）２ω＝１００゜以上の大画角を有し、小型小径で構成枚数が少なく、かつバックフォーカスが長く、イメージサークルが大きく良好な光学性能を有するシフト機構に対応可能な広角レンズを提供することを目的とする。 Accordingly, the present invention has been made in view of the above problems, and has a large angle of view (angle of view) 2ω = 100 ° or more, a small and small diameter, a small number of components, a long back focus, and an image. An object of the present invention is to provide a wide-angle lens that is compatible with a shift mechanism having a large circle and good optical performance.
上記課題を解決するために本発明は、
物体側から順に、負の屈折力を有する前群と、正の屈折力を有する後群とを有し、
前記前群は、物体側から順に、２枚の負レンズと、１つの接合レンズと、最も像側に配置された負レンズとを少なくとも有し、
前記後群は、物体側から順に、２つの正レンズ成分と、負レンズと、正レンズとからなり、
開口絞りは、前記後群に備えられていることを特徴とする広角レンズを提供する。
また本発明の広角レンズは、
以下の条件式（１）を満足することが望ましい。
（１）１．８＜ＢＦ／ｆ ０ ＜３．０
但し、
ＢＦ ：無限遠物点に合焦時のバックフォーカス
ｆ ０ ：前記広角レンズ全系の焦点距離
また本発明の広角レンズは、
以下の条件式（２）を満足することが望ましい。
（２）０．８＜Ｙmax／ｆ ０ ＜２．４
但し、
Ｙmax ：最大像高（像側イメージサークルの半径）
In order to solve the above problems, the present invention
In order from the object side, it has a front group having negative refractive power and a rear group having positive refractive power,
The front group has at least two negative lenses, one cemented lens, and a negative lens arranged closest to the image side in order from the object side,
The rear group is composed of two positive lens components, a negative lens, and a positive lens in order from the object side.
Aperture stop provides a wide-angle lens, characterized in that provided in the rear group.
The wide-angle lens of the present invention is
It is desirable to satisfy the following conditional expression (1).
(1) 1.8 <BF / f 0 <3.0
However,
BF : Back focus when focusing on an object point at infinity
f 0 : Focal length of the entire wide-angle lens system
The wide-angle lens of the present invention is
It is desirable to satisfy the following conditional expression (2).
(2) 0.8 <Ymax / f 0 <2.4
However,
Ymax : Maximum image height (radius of the image side image circle)
また本発明の広角レンズは、
以下の条件式（３）を満足することが望ましい。
（３）−１．５＜ｆＦ／ｆ０＜−０．０５
但し、
ｆＦ：前記前群の焦点距離
ｆ０：前記広角レンズ全系の焦点距離
The wide-angle lens of the present invention is
It is desirable to satisfy the following conditional expression (3).
(3) -1.5 <f F / f 0 <-0.05
However,
f F : focal length of the front group f 0 : focal length of the entire wide-angle lens system
また本発明の広角レンズは、
前記前群と前記後群との間には、物体側に凸面を向けたメニスカス形状の空気レンズが形成され、
以下の条件式（４）を満足することが望ましい。
（４）ｄ１−２／ｆ０＜０．４
但し、
ｄ１−２：前記前群中の最も像側のレンズ面と前記後群中の最も物体側のレンズ面との空気間隔
ｆ０ ：前記広角レンズ全系の焦点距離
The wide-angle lens of the present invention is
Between the front group and the rear group, a meniscus air lens with a convex surface facing the object side is formed,
It is desirable to satisfy the following conditional expression (4).
(4) d 1-2 / f 0 <0.4
However,
d 1-2 : Air distance between the most image side lens surface in the front group and the most object side lens surface in the rear group f 0 : Focal length of the entire wide-angle lens system
また本発明の広角レンズは、
前記前群における前記接合レンズは、正の屈折力を有し、負レンズと正レンズとを含み、
前記前群における前記接合レンズ中の前記正レンズは、当該接合レンズ中の前記負レンズに比してアッベ数の低い硝材で構成されていることが望ましい。
The wide-angle lens of the present invention is
The cemented lens in the front group has a positive refractive power, includes a negative lens and a positive lens,
The positive lens in the cemented lens in the front group is preferably made of a glass material having a lower Abbe number than the negative lens in the cemented lens.
また本発明の広角レンズは、
前記前群は、物体側から２枚の負レンズを有し、当該２枚の負レンズのうちのいずれか一方は非球面を備えていることが望ましい。
また本発明の広角レンズは、
前記後群の前記２つの正レンズ成分の少なくとも１つは、接合レンズであることが望ましい。
また本発明の広角レンズは、
前記開口絞りは、前記後群の前記２つの正レンズ成分の間に配置されていることが望ましい。
The wide-angle lens of the present invention is
It is desirable that the front group has two negative lenses from the object side, and one of the two negative lenses has an aspherical surface.
The wide-angle lens of the present invention is
It is desirable that at least one of the two positive lens components in the rear group is a cemented lens.
The wide-angle lens of the present invention is
The aperture stop is preferably disposed between the two positive lens components in the rear group.
本発明によれば、包括角（画角）２ω＝１００゜以上の大画角を有し、小型小径で構成枚数が少なく、かつバックフォーカスが長く、イメージサークルが大きく良好な光学性能を有するシフト機構に対応可能な広角レンズを提供することができる。 According to the present invention, the shift has a large angle of view (angle of view) of 2ω = 100 ° or more, a small and small diameter, a small number of components, a long back focus, a large image circle, and good optical performance. A wide-angle lens that can support the mechanism can be provided.
はじめに、本発明の広角レンズの基本的な構成について説明する。本発明の広角レンズは、所謂レトロフォーカスタイプの光学系であり、如何に構成枚数を削減し、小型・小径で著しくバックフォーカスが長く、イメージサークルの大きな広角レンズを達成するかという目的で生み出されたものである。 First, the basic configuration of the wide-angle lens of the present invention will be described. The wide-angle lens of the present invention is a so-called retrofocus type optical system, which was created for the purpose of reducing the number of components, achieving a wide-angle lens with a large image circle, a small size and a small diameter, and a long back focus. It is a thing.
斯かる目的の下、本発明の広角レンズは、物体側から順に、負の屈折力を有する前群と、正の屈折力を有する後群とを有し、前記前群は、物体側から順に、２枚の負レンズと、１つの接合レンズと、最も像側に配置された負レンズとを少なくとも有し、前記後群は、物体側から順に、２つの正レンズ成分と、負レンズと、正レンズとからなり、開口絞りは、前記後群に備えられており、以下の条件式（１）,（２）を満足するように構成されている。
（１） １．８＜ＢＦ／ｆ０＜３．０
（２） ０．８＜Ｙmax／ｆ０＜２．４
但し、
ＢＦ ：無限遠物点に合焦時のバックフォーカス
ｆ０ ：前記ズームレンズ全系の焦点距離
Ｙmax ：最大像高（像側イメージサークルの半径）
Under such an object, the wide-angle lens of the present invention has, in order from the object side, a front group having a negative refractive power and a rear group having a positive refractive power, and the front group is in order from the object side. Two negative lenses, one cemented lens, and at least a negative lens disposed closest to the image side, and the rear group in order from the object side includes two positive lens components, a negative lens, The aperture stop is provided in the rear group and is configured to satisfy the following conditional expressions (1) and (2).
(1) 1.8 <BF / f 0 <3.0
(2) 0.8 <Ymax / f 0 <2.4
However,
BF : Back focus when focusing on an object point at infinity f 0 : Focal length Ymax of the entire zoom lens system : Maximum image height (radius of the image side image circle)
前群は、ワイドコンバータとしての作用を有しており、その構成は下方コマ収差、歪曲収差、及び像面湾曲を良好に補正するために、２枚の負レンズを設け、さらに１面の非球面を導入することで、広角レンズにおいて大型化しやすい前群の小型化を図っている。
また、その後方に接合正レンズを設けることで、ペッツバール和を最適に保ちつつ、倍率色収差、及び下方色コマ収差の補正を行っている。
また、前群の最も像側のレンズ面と後群の最も物体側のレンズ面とによって空気レンズを形成することで、球面収差及び下方コマ収差を補正し大口径化を図っている。
ここで、本明細書及び請求の範囲では、単レンズ、及び貼り合わせレンズを含む表現として「レンズ成分」を用いている。
The front group has a function as a wide converter, and the configuration thereof is provided with two negative lenses in order to satisfactorily correct the lower coma aberration, distortion aberration, and field curvature, and further, the non-surface non-surface By introducing a spherical surface, the front group, which tends to be large in a wide-angle lens, is downsized.
Further, by providing a cemented positive lens behind the lens, lateral chromatic aberration and downward chromatic coma are corrected while keeping the Petzval sum optimal.
Further, an air lens is formed by the lens surface closest to the image side of the front group and the lens surface closest to the object side of the rear group, thereby correcting spherical aberration and lower coma and increasing the diameter.
Here, in the present specification and claims, “lens component” is used as an expression including a single lens and a bonded lens.
後群は、基本的に物体側から正・正・負・正のパワー配置を有するマスターレンズである。後群内の前側の２つの正レンズ成分は主に軸上収差の補正を行っている。そしてこの部分の厚肉化やパワーは、全長の短縮化とバックフォーカスの確保とに重要な意味を有する。また、後群内の後ろ側の負レンズと正レンズは、軸上収差に加えて、上方コマ収差及び倍率色収差の補正を行っている。 The rear group is basically a master lens having positive, positive, negative, and positive power arrangements from the object side. The two positive lens components on the front side in the rear group mainly correct axial aberrations. The thickening and power of this portion are important for shortening the overall length and ensuring the back focus. Further, the rear negative lens and the positive lens in the rear group correct upper coma and lateral chromatic aberration in addition to axial aberration.
本発明の広角レンズの基本的な構成は上述のとおりであるが、さらに構成枚数を増やすことで、各成分を細分化して収差補正を分担すれば、より高性能化を図ることもできる。しかしながらその場合は、レンズ全体の大型化、前玉径の増大、及びバックフォーカス確保の困難化が生じてしまう可能性がある。 The basic configuration of the wide-angle lens of the present invention is as described above. However, by further increasing the number of components, if each component is subdivided to share aberration correction, higher performance can be achieved. However, in that case, there is a possibility that the overall size of the lens will increase, the front lens diameter will increase, and it will be difficult to ensure the back focus.
次に、本発明の広角レンズに関する各条件式について説明する。
条件式（１）は、本発明の広角レンズにおいてレトロ比を最適に保つための条件式である。ここで、レトロ比を次の式（Ａ）で定義する。
（Ａ） Ｒｆ＝ＢＦ／ｆ０
但し、
Ｒｆ ：レトロ比
ＢＦ ：無限遠物点に合焦時のバックフォーカス
ｆ０ ：広角レンズ全系の焦点距離
Next, each conditional expression regarding the wide-angle lens of the present invention will be described.
Conditional expression (1) is a conditional expression for keeping the retro ratio optimal in the wide-angle lens of the present invention. Here, the retro ratio is defined by the following equation (A).
(A) Rf = BF / f 0
However,
Rf : Retro ratio BF : Back focus when focusing on an object point at infinity f 0 : Focal length of the entire wide-angle lens system
レトロフォーカスタイプのレンズにおいて、負レンズ群（前群）と正レンズ群（後群）のパワーのバランスとバックフォーカスの大小には相対的な因果関係がある。長いバックフォーカスを必要とすることは、式（Ａ）のレトロ比を大きくすることに等しい。また、著しく大きなレトロ比は、負レンズ群の屈折力が著しく大きくなることを意味し、正レンズ群とのパワーバランスを崩し、光学性能の劣化、特にペッツヴァール和が悪化し像面湾曲、歪曲等の軸外収差の悪化を招いてしまい、結果的にレンズの著しい大型化を招いてしまうこととなる。 In a retro focus type lens, there is a relative causal relationship between the power balance of the negative lens group (front group) and the positive lens group (rear group) and the size of the back focus. The need for a long back focus is equivalent to increasing the retro ratio of equation (A). In addition, a remarkably large retro ratio means that the refractive power of the negative lens group is remarkably increased, which destroys the power balance with the positive lens group, and deteriorates optical performance, particularly the Petzval sum, which causes field curvature and distortion. As a result, off-axis aberrations such as the above-mentioned aberrations are deteriorated, resulting in a significant increase in the size of the lens.
本発明の広角レンズにおいて条件式（１）の対応値が当該条件式（１）の上限値を上回ると、上述のように著しくレトロ比が大きくなるため、負レンズ群のパワーが著しく大きくなる。したがって、本発明のような単純で構成枚数の少ない光学系では、ペッツヴァール和の最適な設定が困難になり、軸外収差が悪化してしまう。中でも、歪曲と非点収差及び像面湾曲の補正が困難になってしまう。また、前玉径が増加し、大型化してしまうため好ましくない。 In the wide-angle lens of the present invention, when the corresponding value of the conditional expression (1) exceeds the upper limit value of the conditional expression (1), the retro ratio is remarkably increased as described above, so that the power of the negative lens group is remarkably increased. Therefore, in a simple optical system having a small number of components as in the present invention, it is difficult to optimally set the Petzval sum, and off-axis aberrations deteriorate. In particular, it is difficult to correct distortion, astigmatism, and field curvature. Moreover, since the front lens diameter increases and the size increases, it is not preferable.
一方、本発明の広角レンズにおいて条件式（１）の対応値が当該条件式（１）の下限値を下回ると、前記レトロ比が小さくなり、最適なバックフォーカスを確保することが困難になってしまう。特に、シフト機構に対応可能な広角レンズの場合、鏡筒部分のシフト機構の関係で、通常のレンズよりもさらに長いバックフォーカスが必要になり、バックフォーカスの最適値が限られてしまう。又は、広角レンズ全系の焦点距離が長くなるため、色収差が増大する傾向にあり好ましくない。
なお、条件式（１）の下限値を１．９９に設定すれば本発明の最良の効果を発揮することができ、本発明の目的に最もかなった光学系を達成するためにはこの下限値が望ましい。
On the other hand, when the corresponding value of the conditional expression (1) is less than the lower limit value of the conditional expression (1) in the wide-angle lens of the present invention, the retro ratio becomes small and it becomes difficult to ensure an optimal back focus. End up. In particular, in the case of a wide-angle lens that can handle the shift mechanism, a back focus longer than that of a normal lens is required because of the shift mechanism of the lens barrel portion, and the optimum value of the back focus is limited. Or, since the focal length of the entire wide-angle lens system becomes long, chromatic aberration tends to increase, which is not preferable.
If the lower limit value of the conditional expression (1) is set to 1.99, the best effect of the present invention can be exhibited. In order to achieve an optical system best suited for the purpose of the present invention, this lower limit value is used. Is desirable.
条件式（２）は、イメージサークルを規定する条件式であり、この式を満足することは本発明の目的にかなった包括角（画角）を設定することに等しい。
本発明の広角レンズにおいて条件式（２）の対応値が当該条件式（２）の上限値を上回ると、焦点距離に比較して、大きなイメージサークルを有することになり、本発明のような単純で構成枚数の少ない光学系では、コマ収差、像面湾曲等の軸外収差を補正することが困難になってしまう。
Conditional expression (2) is a conditional expression that defines the image circle. Satisfying this expression is equivalent to setting an inclusive angle (view angle) suitable for the purpose of the present invention.
In the wide-angle lens of the present invention, when the corresponding value of the conditional expression (2) exceeds the upper limit value of the conditional expression (2), it has a large image circle as compared with the focal length. In an optical system having a small number of components, it is difficult to correct off-axis aberrations such as coma and curvature of field.
一方、本発明の広角レンズにおいて条件式（２）の対応値が当該条件式（２）の下限値を下回ると、実質シフト機構を有した広角レンズとしては実用的な仕様を満足しない。又は、広角レンズ全系の焦点距離が長くなるため、色収差が増大する傾向にあり好ましくない。
なお、条件式（２）の上限値を１．０に設定すればより良い収差補正を達成することができる。
On the other hand, in the wide-angle lens of the present invention, when the corresponding value of the conditional expression (2) is less than the lower limit value of the conditional expression (2), practical specifications are not satisfied as a wide-angle lens having a substantial shift mechanism. Or, since the focal length of the entire wide-angle lens system becomes long, chromatic aberration tends to increase, which is not preferable.
If the upper limit value of conditional expression (2) is set to 1.0, better aberration correction can be achieved.
条件式（３）は、物体側に位置する負レンズ群（前群）の屈折力に関する条件式である。
本発明の広角レンズにおいて条件式（３）の対応値が当該条件式（３）の上限値を上回ると、前記負レンズ群の屈折力が大きくなるため、本発明のような単純で構成枚数の少ない光学系では、ペッツヴァール和の最適な設定が困難になり、軸外収差が悪化してしまう。中でも、歪曲と非点収差及び像面湾曲を補正することが困難になってしまう。また、前玉径が増加し、大型化してしまうため好ましくない。
なお、条件式（３）の上限値を−０．１に設定すればより良い収差補正を達成することができる。
Conditional expression (3) is a conditional expression regarding the refractive power of the negative lens group (front group) located on the object side.
In the wide-angle lens of the present invention, when the corresponding value of the conditional expression (3) exceeds the upper limit value of the conditional expression (3), the refractive power of the negative lens group increases. With a small number of optical systems, it is difficult to set the Petzval sum optimally, and off-axis aberrations deteriorate. In particular, it becomes difficult to correct distortion, astigmatism, and field curvature. Moreover, since the front lens diameter increases and the size increases, it is not preferable.
If the upper limit of conditional expression (3) is set to -0.1, better aberration correction can be achieved.
一方、本発明の広角レンズにおいて条件式（３）の対応値が当該条件式（３）の下限値を下回ると、前記負レンズ群の屈折力が小さくなるため、大型化を招いてしまい好ましくない。又は、軸外収差の悪化を招き、特に歪曲収差と像面湾曲、倍率色収差等が悪化するため好ましくない。
なお、条件式（３）の下限値を−１．０に設定すればより良い収差補正を達成することができる。また、条件式（３）の下限値を−０．６、さらには−０．５５に設定すれば本発明の最良の効果を発揮することができる。
On the other hand, if the corresponding value of the conditional expression (3) is less than the lower limit value of the conditional expression (3) in the wide-angle lens of the present invention, the refractive power of the negative lens group becomes small, leading to an increase in size. . Alternatively, off-axis aberrations are worsened, and distortion, field curvature, lateral chromatic aberration, and the like are worsened.
If the lower limit value of conditional expression (3) is set to -1.0, better aberration correction can be achieved. Moreover, the best effect of the present invention can be exhibited by setting the lower limit value of conditional expression (3) to -0.6, and further to -0.55.
条件式（４）は、物体側に位置する負レンズ群（前群）とその像側にある正レンズ群（後群）との間に形成される空気レンズの厚みを設定するための条件式である。本発明の場合、負レンズ群と正レンズ群との間の空気レンズは、物体側に凸面を向けたメニスカス形状をなしている。この空気レンズは、球面収差やコマ収差の補正に効果があり、その効果の尺度となる屈折力は、当該空気レンズを形成する前後のレンズ面の曲率半径と空気レンズの厚みｄ1-2（負レンズ群と正レンズ群との間の空気間隔）によって決まる。この条件は、空気レンズの屈折力の大小関係を示している。 Conditional expression (4) is a conditional expression for setting the thickness of the air lens formed between the negative lens group (front group) located on the object side and the positive lens group (rear group) located on the image side. It is. In the case of the present invention, the air lens between the negative lens group and the positive lens group has a meniscus shape with a convex surface facing the object side. This air lens is effective in correcting spherical aberration and coma aberration, and the refractive power as a measure of the effect is determined by the curvature radius of the lens surface before and after forming the air lens and the thickness d 1-2 ( Air distance between the negative lens group and the positive lens group). This condition indicates the magnitude relationship of the refractive power of the air lens.
本発明の広角レンズにおいて条件式（４）の対応値が当該条件式（４）の上限値を上回ると、結果的に空気レンズのパワーが小さくなるため、本発明のような単純で構成枚数の少ない光学系では、球面収差、下方コマ収差を補正することが困難になってしまう。
なお、条件式（４）の上限値を０．２に設定すればより良い収差補正を達成することができる。また、条件式（４）の上限値を０．１に設定すれば本発明の最良の効果を発揮することができる。
In the wide-angle lens of the present invention, when the corresponding value of the conditional expression (4) exceeds the upper limit value of the conditional expression (4), the power of the air lens is reduced as a result. With few optical systems, it becomes difficult to correct spherical aberration and lower coma.
If the upper limit of conditional expression (4) is set to 0.2, better aberration correction can be achieved. Moreover, if the upper limit of conditional expression (4) is set to 0.1, the best effect of the present invention can be exhibited.
また、本発明の広角レンズにおける前記空気レンズは、開口絞りに対して凹面を向けていることが望ましい。またさらには、空気レンズの物体側と像側のいずれかのレンズ面の曲率中心の近傍、又は曲率半径の０．７倍〜１．３倍の位置に、開口絞りを備えていることが望ましい。このような構成により、球面収差を良好に補正することができる。 Moreover, it is desirable that the air lens in the wide-angle lens of the present invention has a concave surface with respect to the aperture stop. Furthermore, it is desirable to provide an aperture stop in the vicinity of the center of curvature of the lens surface on either the object side or the image side of the air lens, or at a position 0.7 to 1.3 times the radius of curvature. . With such a configuration, spherical aberration can be corrected satisfactorily.
また、倍率色収差や色コマ収差を良好に補正するために、前群における接合レンズは正の屈折力を有し、接合レンズ中の正レンズは同じ接合レンズ中の負レンズに比較して低分散の硝材で構成されていることが望ましい。
また、本発明のような単純で構成枚数の少ない光学系では、軸外収差、特に歪曲収差、下方コマ収差、及び像面湾曲を主に補正するために、前群は物体側から順に２枚の負レンズを有し、その中の１つのレンズ面は非球面であることが望ましい。
In addition, in order to satisfactorily correct lateral chromatic aberration and chromatic coma, the cemented lens in the front group has positive refractive power, and the positive lens in the cemented lens has low dispersion compared to the negative lens in the same cemented lens. It is desirable to be made of glass material.
Further, in a simple optical system having a small number of components as in the present invention, the front group consists of two in order from the object side in order to mainly correct off-axis aberrations, particularly distortion aberration, lower coma aberration, and field curvature. It is desirable that one lens surface among them is an aspherical surface.
以下、添付図面に基づいて本発明の各実施例に係る広角レンズについて説明する。
（第１実施例）
図１は、本発明の第１実施例に係る広角レンズの構成を示す図である。
本実施例に係る広角レンズは、物体側から順に、負の屈折力を有する前群Ｇｆと、正の屈折力を有する後群Ｇｒとからなる。
前群Ｇｆは、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ１、物体側に凸面を向け像側のレンズ面が非球面である負メニスカス非球面レンズＬ２、物体側に凸面を向けた負メニスカスレンズＬ３と両凸形状の正レンズＬ４との接合よりなる接合正レンズと、物体側に凸面を向けた負メニスカスレンズＬ５とからなる。
Hereinafter, a wide angle lens according to each embodiment of the present invention will be described with reference to the accompanying drawings.
(First embodiment)
FIG. 1 is a diagram showing a configuration of a wide-angle lens according to a first example of the present invention.
The wide-angle lens according to the present embodiment includes, in order from the object side, a front group Gf having a negative refractive power and a rear group Gr having a positive refractive power.
The front group Gf includes, in order from the object side, a negative meniscus lens L1 having a convex surface directed toward the object side, a negative meniscus aspherical lens L2 having a convex surface directed toward the object side and an aspheric lens surface on the image side, and a convex surface directed toward the object side. It consists of a cemented positive lens composed of a cemented negative meniscus lens L3 and a biconvex positive lens L4, and a negative meniscus lens L5 with a convex surface facing the object side.
後群Ｇｒは、物体側から順に、両凸形状の正レンズＬ６と像側に凸面を向けた負メニスカスレンズＬ７との接合よりなる接合正レンズと、開口絞りＳと、像側に凸面を向けた正メニスカスレンズＬ８と像側に凸面を向けた負メニスカスレンズＬ９との接合よりなる接合正レンズと、物体側に凸面を向けた負メニスカスレンズＬ１０と、像側に凸面を向けた正メニスカスレンズＬ１１とからなる。 The rear group Gr, in order from the object side, has a cemented positive lens composed of a biconvex positive lens L6 and a negative meniscus lens L7 having a convex surface facing the image side, an aperture stop S, and a convex surface facing the image side. Positive meniscus lens L8 and negative meniscus lens L10 having a convex surface facing the image side, negative meniscus lens L10 having a convex surface facing the object side, and positive meniscus lens having a convex surface facing the image side L11.
以下の表１に、本発明の第１実施例に係る広角レンズの諸元の値を掲げる。
［全体諸元］において、ｆは焦点距離、２ωは画角（包括角）、ＦＮＯはＦナンバーをそれぞれ示す。
［レンズデータ］において、面番号は物体側から数えたレンズ面の順番、ｒiは物体側からｉ番目のレンズ面Ｒiの曲率半径、ｄiはレンズ面Ｒiとレンズ面Ｒi+1との光軸上の面間隔、ｎi，νiはレンズ面Ｒiとレンズ面Ｒi+1との間の媒質のｄ線（λ＝５８７．５６ｎｍ）に対する屈折率，アッベ数をそれぞれ示す。さらに、レンズデータ中の非球面には、星印（★）を付して曲率半径ｒの欄には近軸曲率半径を示し、κ及び各非球面係数は［非球面データ］の欄に記載する。
Table 1 below lists values of specifications of the wide-angle lens according to the first example of the present invention.
In [Overall specifications], f is a focal length, 2ω is an angle of view (inclusive angle), and FNO is an F number.
In [Lens data], the surface number is the order of the lens surfaces counted from the object side, ri is the radius of curvature of the i-th lens surface Ri from the object side, and di is on the optical axis between the lens surface Ri and the lens surface Ri + 1. , Ni and νi represent the refractive index and Abbe number for the d-line (λ = 587.56 nm) of the medium between the lens surface Ri and the lens surface Ri + 1, respectively. Further, the aspherical surface in the lens data is marked with an asterisk (*), the paraxial radius of curvature is indicated in the column of the radius of curvature r, and κ and each aspherical coefficient are described in the column of [Aspherical data]. To do.
［非球面データ］において、「E-n」は「×１０−ｎ」を示す。諸元表に示す非球面は、光軸から垂直方向の高さｙにおける各非球面の頂点の接平面から光軸方向に沿った距離（サグ量）をＳ（ｙ）、基準球面の曲率半径をＲ、円錐係数をκ、ｎ次の非球面係数をＣnとするとき、以下の非球面式で表される。なお、０（ゼロ）となる非球面係数はその記載を省略している。
Ｓ（ｙ）＝（ｙ2／Ｒ）／〔１＋（１−κ・ｙ2／Ｒ2）1/2〕
＋Ｃ4・ｙ4＋Ｃ6・ｙ6＋Ｃ8・ｙ8＋Ｃ10・ｙ10＋Ｃ12・ｙ12＋Ｃ14・ｙ14
［可変間隔データ］において、βは拡大倍率、Ｒは撮影距離をそれぞれ示し、Ｗ、Ｍ、Ｔはそれぞれ広角端状態、中間焦点距離状態、望遠端状態を示している。
In [Aspherical data], “En” indicates “× 10 −n ”. The aspherical surface shown in the specification table is the distance (sag amount) along the optical axis direction from the tangent plane of the apex of each aspherical surface at the height y in the vertical direction from the optical axis, S (y), and the radius of curvature of the reference spherical surface Is R, the conic coefficient is κ, and the nth-order aspherical coefficient is Cn, it is expressed by the following aspherical expression. Note that the description of the aspherical coefficient that is 0 (zero) is omitted.
S (y) = (y 2 / R) / [1+ (1−κ · y 2 / R 2 ) 1/2 ]
+ C4 · y 4 + C6 · y 6 + C8 ·
In [variable interval data], β indicates an enlargement magnification, R indicates a shooting distance, and W, M, and T indicate a wide-angle end state, an intermediate focal length state, and a telephoto end state, respectively.
ここで、以下の全ての諸元値において掲載されている焦点距離ｆ、曲率半径ｒ、その他長さの単位は一般に「ｍｍ」が使われる。しかし光学系は、比例拡大又は比例縮小しても同等の光学性能が得られるため、これに限られるものではない。
なお、以下の全ての実施例の諸元値においても、本実施例と同様の符号を用いる。
Here, the unit of the focal length f, the radius of curvature r, and other lengths listed in all the following specification values is generally “mm”. However, the optical system is not limited to this because an equivalent optical performance can be obtained even when proportional expansion or proportional reduction is performed.
In addition, also in the specification values of all the following examples, the same symbols as in this example are used.
（表１）
［全体諸元］
ｆ ＝ 24.7mm
２ω ＝ 100.04゜
ＦＮＯ＝ 3.59
［レンズデータ］
面番号 ｒ ｄ ν ｎ
1) 35.0000 1.6000 61.09 1.589130
2) 18.0000 5.0000
3) 22.8703 2.0000 61.09 1.589130
4)★ 9.8319 8.0000
5) 71.4844 1.6000 49.45 1.772789
6) 13.4776 8.0000 35.70 1.625882
7) -103.8312 0.1000
8) 49.3425 1.3000 61.09 1.589130
9) 14.3008 1.0199(d1-2)
10) 15.2391 14.0000 64.10 1.516800
11) -12.6934 1.2000 49.45 1.772789
12) -18.4413 1.0000
13> 開口絞りＳ 4.0000
14) -67.6926 6.0000 82.52 1.497820
15) -11.7538 1.0000 33.92 1.803840
16) -18.6252 0.1000
17) 153.9252 1.0000 40.90 1.796310
18) 30.4968 1.6000
19) -1885.9241 2.8000 54.01 1.617200
20) -28.8707 51.1105(BF)
［非球面データ（κ及び各非球面係数）］
面番号 κ Ｃ4 Ｃ6 Ｃ8 Ｃ10
4) 0.2628 3.59500E-05 7.07880E-08 5.62040E-10 -7.10660E-13
［条件式対応値］
条件式（１） ＢＦ／ｆ０＝ 2.07
条件式（２） Ｙmax／ｆ０＝ 1.18
条件式（３） ｆＦ／ｆ０＝ -0.44
条件式（４） ｄ１−２／ｆ０＝ 0.041
(Table 1)
[Overall specifications]
f = 24.7mm
2ω = 100.04 ° FNO = 3.59
[Lens data]
Surface number r d v n
1) 35.0000 1.6000 61.09 1.589130
2) 18.0000 5.0000
3) 22.8703 2.0000 61.09 1.589130
4) ★ 9.8319 8.0000
5) 71.4844 1.6000 49.45 1.772789
6) 13.4776 8.0000 35.70 1.625882
7) -103.8312 0.1000
8) 49.3425 1.3000 61.09 1.589130
9) 14.3008 1.0199 (d1-2)
10) 15.2391 14.0000 64.10 1.516800
11) -12.6934 1.2000 49.45 1.772789
12) -18.4413 1.0000
13> Aperture stop S 4.0000
14) -67.6926 6.0000 82.52 1.497820
15) -11.7538 1.0000 33.92 1.803840
16) -18.6252 0.1000
17) 153.9252 1.0000 40.90 1.796310
18) 30.4968 1.6000
19) -1885.9241 2.8000 54.01 1.617200
20) -28.8707 51.1105 (BF)
[Aspheric data (κ and each aspheric coefficient)]
Surface number κ C4 C6 C8 C10
4) 0.2628 3.59500E-05 7.07880E-08 5.62040E-10 -7.10660E-13
[Conditional expression values]
Conditional expression (1) BF / f 0 = 2.07
Conditional expression (2) Ymax / f 0 = 1.18
Conditional expression (3) f F / f 0 = −0.44
Conditional expression (4) d 1-2 / f 0 = 0.041
図２は、本発明の第１実施例に係る広角レンズの無限遠合焦時の諸収差図である。
各収差図において、ＦＮＯはＦナンバー、Ｙは像高をそれぞれ示す。なお、球面収差図においては最大口径に対応するＦナンバーの値を示し、非点収差図及び歪曲収差図においては像高Ｙの最大値をそれぞれ示す。
また、コマ収差図においては各半画角の値を示す。また、ｄ，ｇはそれぞれ、ｄ線（λ＝５８７．５６ｎｍ），ｇ線（λ＝４３５．８４ｎｍ）の収差曲線を示す。さらに、非点収差図において、実線はサジタル像面、破線はメリジオナル像面をそれぞれ示す。
なお、以下に示す全実施例の諸収差図において、本実施例と同様の符号を用いる。
図２より、本実施例に係る広角レンズは、諸収差を良好に補正していることがわかる。
FIG. 2 is a diagram illustrating various aberrations of the wide-angle lens according to the first example of the present invention when focusing on infinity.
In each aberration diagram, FNO represents an F number, and Y represents an image height. In the spherical aberration diagram, the F-number value corresponding to the maximum aperture is shown, and in the astigmatism diagram and the distortion diagram, the maximum value of the image height Y is shown.
In the coma aberration diagram, the values of the half angle of view are shown. D and g indicate aberration curves of the d-line (λ = 587.56 nm) and the g-line (λ = 435.84 nm), respectively. Further, in the astigmatism diagram, the solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane.
In addition, in the various aberration diagrams of all the examples shown below, the same reference numerals as those in this example are used.
FIG. 2 shows that the wide-angle lens according to this example corrects various aberrations satisfactorily.
（第２実施例）
図３は、本発明の第２実施例に係る広角レンズの構成を示す図である。
本実施例に係る広角レンズは、物体側から順に、負の屈折力を有する前群Ｇｆと、正の屈折力を有する後群Ｇｒとからなる。
前群Ｇｆは、物体側から順に、物体側に凸面を向けた負メニスカスレンズＬ１、物体側に凸面を向け像側のレンズ面が非球面である負メニスカス非球面レンズＬ２、両凸形状の正レンズＬ３と像側に凸面を向けた負メニスカスレンズＬ４との接合よりなる接合正レンズと、物体側に凸面を向けた負メニスカスレンズＬ５とからなる。
(Second embodiment)
FIG. 3 is a diagram showing a configuration of a wide-angle lens according to the second embodiment of the present invention.
The wide-angle lens according to the present embodiment includes, in order from the object side, a front group Gf having a negative refractive power and a rear group Gr having a positive refractive power.
The front group Gf includes, in order from the object side, a negative meniscus lens L1 having a convex surface facing the object side, a negative meniscus aspheric lens L2 having a convex surface facing the object side and an image-side lens surface that is aspheric, and a biconvex positive lens. It consists of a cemented positive lens composed of a lens L3 and a negative meniscus lens L4 having a convex surface facing the image side, and a negative meniscus lens L5 having a convex surface facing the object side.
後群Ｇｒは、物体側から順に、両凸形状の正レンズＬ６と、開口絞りＳと、像側に凸面を向けた正メニスカスレンズＬ７と像側に凸面を向けた負メニスカスレンズＬ８との接合よりなる接合正レンズと、物体側に凸面を向けた負メニスカスレンズＬ９と、像側に凸面を向けた正メニスカスレンズＬ１０とからなる。
以下の表２に、本発明の第２実施例に係る広角レンズの諸元の値を掲げる。
The rear group Gr includes, in order from the object side, a positive biconvex lens L6, an aperture stop S, a positive meniscus lens L7 having a convex surface facing the image side, and a negative meniscus lens L8 having a convex surface facing the image side. And a negative meniscus lens L9 having a convex surface facing the object side, and a positive meniscus lens L10 having a convex surface facing the image side.
Table 2 below lists values of specifications of the wide-angle lens according to the second example of the present invention.
（表２）
［全体諸元］
ｆ ＝ 24.7mm
２ω ＝ 100.2゜
ＦＮＯ＝ 3.88
［レンズデータ］
面番号 ｒ ｄ ν ｎ
1) 30.3799 1.6000 61.09 1.589130
2) 16.7030 5.8337
3) 18.6228 2.0000 61.09 1.589130
4)★ 9.5367 8.0000
5) 159.6091 11.0000 33.75 1.648311
6) -24.9262 1.6000 49.45 1.772789
7) -77.9796 0.1000
8) 73.4885 1.3000 60.03 1.640000
9) 13.1615 1.4623(d1-2)
10) 15.0271 14.0000 60.69 1.563840
11) -24.9279 1.0000
12> 開口絞りＳ 2.7415
13) -74.7857 6.0000 82.52 1.497820
14) -10.7815 1.0000 35.72 1.902650
15) -16.7447 0.1000
16) 373.6699 1.6000 35.72 1.902650
17) 35.8649 1.5000
18) -254.2443 3.0000 50.84 1.658440
19) -26.4911 51.8373(BF)
［非球面データ（κ及び各非球面係数）］
面番号 κ Ｃ4 Ｃ6 Ｃ8 Ｃ10
4) 0.2802 3.63230E-05 2.77070E-07 -2.95910E-10 6.55280E-12
［条件式対応値］
条件式（１） ＢＦ／ｆ０＝ 2.10
条件式（２） Ｙmax／ｆ０＝ 1.18
条件式（３） ｆＦ／ｆ０＝ -0.40
条件式（４） ｄ１−２／ｆ０＝ 0.059
(Table 2)
[Overall specifications]
f = 24.7mm
2ω = 100.2 ° FNO = 3.88
[Lens data]
Surface number r d v n
1) 30.3799 1.6000 61.09 1.589130
2) 16.7030 5.8337
3) 18.6228 2.0000 61.09 1.589130
4) ★ 9.5367 8.0000
5) 159.6091 11.0000 33.75 1.648311
6) -24.9262 1.6000 49.45 1.772789
7) -77.9796 0.1000
8) 73.4885 1.3000 60.03 1.640000
9) 13.1615 1.4623 (d1-2)
10) 15.0271 14.0000 60.69 1.563840
11) -24.9279 1.0000
12> Aperture stop S 2.7415
13) -74.7857 6.0000 82.52 1.497820
14) -10.7815 1.0000 35.72 1.902650
15) -16.7447 0.1000
16) 373.6699 1.6000 35.72 1.902650
17) 35.8649 1.5000
18) -254.2443 3.0000 50.84 1.658440
19) -26.4911 51.8373 (BF)
[Aspheric data (κ and each aspheric coefficient)]
Surface number κ C4 C6 C8 C10
4) 0.2802 3.63230E-05 2.77070E-07 -2.95910E-10 6.55280E-12
[Conditional expression values]
Conditional expression (1) BF / f 0 = 2.10
Conditional expression (2) Ymax / f 0 = 1.18
Conditional expression (3) f F / f 0 = −0.40
Conditional expression (4) d 1-2 / f 0 = 0.059
図３は、本発明の第２実施例に係る広角レンズの無限遠合焦時の諸収差図である。
図３より、本実施例に係る広角レンズは、諸収差を良好に補正していることがわかる。
FIG. 3 is a diagram illustrating various aberrations of the wide-angle lens according to the second example of the present invention when focused on infinity.
FIG. 3 shows that the wide-angle lens according to this example corrects various aberrations satisfactorily.
上記各実施例によれば、包括角（画角）２ω＝１００゜以上の大画角を有し、小型小径で構成枚数が少なく、かつバックフォーカスが長く、イメージサークルが大きく良好な光学性能を有するシフト機構に対応可能な広角レンズを実現することができる。 According to each of the above-described embodiments, a large angle of view (angle of view) 2ω = 100 ° or more, a small and small diameter, a small number of components, a long back focus, a large image circle, and good optical performance. It is possible to realize a wide-angle lens compatible with the shift mechanism.
なお、本発明の実施例として、２群構成のレンズ系を示したが、該２群に付加レンズ群を加えただけのレンズ系も本発明の効果を内在した同等のレンズ系であることは言うまでもない。また、各レンズ群内の構成においても、実施例の構成に付加レンズを加えただけのレンズ群も本発明の効果を内在した同等のレンズ群であることは言うまでもない。
なお、上記各実施例は本発明の一具体例を示しているものであり、本発明はこれらに限定されるものではない。
As an example of the present invention, a lens system having a two-group configuration is shown. However, a lens system in which an additional lens group is added to the two groups is also an equivalent lens system having the effect of the present invention. Needless to say. In addition, in the configuration within each lens group, it goes without saying that a lens group in which an additional lens is added to the configuration of the embodiment is an equivalent lens group in which the effects of the present invention are inherent.
In addition, each said Example has shown one specific example of this invention, and this invention is not limited to these.
Ｇｆ 前群
Ｇｒ 後群
Ｓ 開口絞り
Ｉ 像面
Gf Front group Gr Rear group S Aperture stop I Image plane
Claims (9)
前記前群は、物体側から順に、２枚の負レンズと、１つの接合レンズと、最も像側に配置された負レンズとを少なくとも有し、
前記後群は、物体側から順に、２つの正レンズ成分と、負レンズと、正レンズとからなり、
開口絞りは、前記後群に備えられていることを特徴とする広角レンズ。 In order from the object side, it has a front group having negative refractive power and a rear group having positive refractive power,
The front group has at least two negative lenses, one cemented lens, and a negative lens arranged closest to the image side in order from the object side,
The rear group is composed of two positive lens components, a negative lens, and a positive lens in order from the object side.
A wide-angle lens, wherein an aperture stop is provided in the rear group.
１．８＜ＢＦ／ｆ０＜３．０
但し、
ＢＦ ：無限遠物点に合焦時のバックフォーカス
ｆ０ ：前記広角レンズ全系の焦点距離 The wide-angle lens according to claim 1, wherein the following conditional expression is satisfied.
1.8 <BF / f 0 <3.0
However,
BF : Back focus when focusing on an object point at infinity f 0 : Focal length of the entire wide-angle lens system
０．８＜Ｙmax／ｆ０＜２．４
但し、
Ｙmax ：最大像高（像側イメージサークルの半径） The wide angle lens according to claim 1, wherein the following conditional expression is satisfied.
0.8 <Ymax / f 0 <2.4
However,
Ymax : Maximum image height (radius of the image side image circle)
−１．５＜ｆＦ／ｆ０＜−０．０５
但し、
ｆＦ：前記前群の焦点距離
ｆ０：前記広角レンズ全系の焦点距離 The wide-angle lens according to any one of claims 1 to 3, wherein the following conditional expression is satisfied.
−1.5 <f F / f 0 <−0.05
However,
f F : focal length of the front group f 0 : focal length of the entire wide-angle lens system
以下の条件式を満足することを特徴とする請求項１から請求項４のいずれか１項に記載の広角レンズ。
ｄ１−２／ｆ０＜０．４
但し、
ｄ１−２：前記前群中の最も像側のレンズ面と前記後群中の最も物体側のレンズ面との空気間隔
ｆ０ ：前記広角レンズ全系の焦点距離 Between the front group and the rear group, a meniscus air lens with a convex surface facing the object side is formed,
The wide-angle lens according to any one of claims 1 to 4, wherein the following conditional expression is satisfied.
d 1-2 / f 0 <0.4
However,
d 1-2 : Air distance between the most image side lens surface in the front group and the most object side lens surface in the rear group f 0 : Focal length of the entire wide-angle lens system
前記前群における前記接合レンズ中の前記正レンズは、当該接合レンズ中の前記負レンズに比してアッベ数の低い硝材で構成されていることを特徴とする請求項１から請求項５のいずれか１項に記載の広角レンズ。 The cemented lens in the front group has a positive refractive power, includes a negative lens and a positive lens,
6. The positive lens in the cemented lens in the front group is made of a glass material having a lower Abbe number than the negative lens in the cemented lens. 2. A wide-angle lens according to item 1.
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| JP2005285394A JP4839763B2 (en) | 2005-09-29 | 2005-09-29 | Wide angle lens |
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| JP2005285394A JP4839763B2 (en) | 2005-09-29 | 2005-09-29 | Wide angle lens |
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| JP5170616B2 (en) * | 2007-04-23 | 2013-03-27 | 株式会社ニコン | Wide angle lens, imaging device, and focusing method of wide angle lens |
| JP5213424B2 (en) * | 2007-12-10 | 2013-06-19 | キヤノン株式会社 | Optical system and optical apparatus having the same |
| JP5712762B2 (en) * | 2011-04-22 | 2015-05-07 | リコーイメージング株式会社 | Shooting lens system |
| JP6056429B2 (en) | 2012-12-03 | 2017-01-11 | リコーイメージング株式会社 | Super wide-angle lens system |
| JP6426063B2 (en) * | 2015-07-22 | 2018-11-21 | 富士フイルム株式会社 | Imaging lens and imaging apparatus |
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| JP4340469B2 (en) * | 2003-03-28 | 2009-10-07 | リコー光学株式会社 | Projection lens and projection-type image display device |
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