JP2003232998A - Wide angle lens - Google Patents
Wide angle lensInfo
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- JP2003232998A JP2003232998A JP2002033898A JP2002033898A JP2003232998A JP 2003232998 A JP2003232998 A JP 2003232998A JP 2002033898 A JP2002033898 A JP 2002033898A JP 2002033898 A JP2002033898 A JP 2002033898A JP 2003232998 A JP2003232998 A JP 2003232998A
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、CCDやCMOS
等の受光素子を用いた車載用カメラ、携帯電話搭載カメ
ラ等に用いられる小型で軽量な高画質対応の後側焦点距
離の長い広角レンズに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to CCDs and CMOSs.
The present invention relates to a compact and lightweight wide-angle lens having a long rear focal length, which is compatible with high image quality and is used for a vehicle-mounted camera, a camera mounted with a mobile phone, etc.
【0002】[0002]
【従来の技術】最近、自動車等の後方確認用カメラや監
視用カメラ等においては、小型で、画像取り込み角度が
水平方向で100度を超すような超広角レンズが求めら
れている。このような広角レンズを用いた小型カメラの
受光素子には、殆どCCDやCMOSが用いられてい
る。これらの受光素子の特徴は、各画素に取り込める光
線角度に制約があるということである。この性質を無視
するような光学系が組み込まれたカメラでは、周辺光量
が急激に減少し、いわゆる、周辺部の暗いカメラとなっ
てしまう。2. Description of the Related Art Recently, there is a demand for an ultra-wide-angle lens which is compact and has an image capturing angle of more than 100 degrees in the horizontal direction in a rear view confirmation camera or a surveillance camera of an automobile or the like. CCDs and CMOSs are mostly used for the light receiving elements of small cameras using such wide-angle lenses. A feature of these light receiving elements is that there is a restriction on the angle of light rays that can be captured by each pixel. A camera incorporating an optical system that ignores this property sharply reduces the amount of peripheral light, resulting in a so-called dark peripheral camera.
【0003】このような現象を補正するために、一般に
は電気的な補正回路(シェーディング補正回路)を組み
込む方式が採用されている。しかしこの方式では回路基
板が大型化し、小型・コンパクト化の要請に合致しな
い。電気的な補正以外の方法として、受光素子と一対を
なすマイクロレンズを配置し、素子面への受光角を拡大
する方式も提案されている。しかし、この方式では大幅
なコスト高を招くので、実用性に乏しい。In order to correct such a phenomenon, a method of incorporating an electrical correction circuit (shading correction circuit) is generally adopted. However, in this method, the circuit board becomes large and does not meet the demand for miniaturization and compactness. As a method other than the electrical correction, a method of arranging a microlens forming a pair with the light receiving element to expand the light receiving angle to the element surface has also been proposed. However, this method causes a significant increase in cost and is not practical.
【0004】そこで、近年においては、上記課題をレン
ズ系によって解決しようとする試みが一般的に行われる
ようになってきている。例えば、多枚数の球面レンズを
使用して、性能を整え、射出瞳の長いレンズを実現して
いる。また、小型・軽量化を目的として、物体側より順
に配列した凹非球面レンズおよび凸非球面レンズからな
る2枚の非球面レンズを用いた提案もなされている。Therefore, in recent years, attempts have generally been made to solve the above problems by using a lens system. For example, the performance is adjusted by using a large number of spherical lenses to realize a lens with a long exit pupil. Further, for the purpose of downsizing and weight reduction, a proposal using two aspherical lenses including a concave aspherical lens and a convex aspherical lens arranged in order from the object side has been made.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、多数枚
の球面レンズを用いて高性能で射出瞳の長い広角レンズ
を実現しようとすると、レンズ光学系のトータルコスト
が極めて高くなるばかりか、レンズが大型化してしまう
ので実用に供しない。However, in order to realize a high-performance wide-angle lens with a long exit pupil by using a large number of spherical lenses, not only the total cost of the lens optical system becomes extremely high, but also the size of the lens becomes large. It will not be put to practical use because it will become.
【0006】また、小型軽量化を目的とした凹レンズと
凸レンズの2枚の非球面レンズを用いた方法では、長い
射出瞳を得ることが難しいばかりか、倍率の色収差を抑
えることも困難であり、結果的におのずとその用途に限
界がある。Further, in a method using two aspherical lenses, a concave lens and a convex lens, for the purpose of downsizing and weight reduction, not only is it difficult to obtain a long exit pupil, but it is also difficult to suppress chromatic aberration of magnification. As a result, there are naturally limits to their use.
【0007】以上のように、これらいずれのタイプの広
角レンズにおいても、小型軽量化および低コスト化を実
現し、倍率の色収差を抑制し、長い射出瞳を得ようとす
る要求を同時に満たすことが極めて困難である。As described above, in any of these types of wide-angle lenses, it is possible to realize a reduction in size and weight and a reduction in cost, suppress chromatic aberration of magnification, and simultaneously satisfy the requirements for obtaining a long exit pupil. It's extremely difficult.
【0008】そこで、本発明の課題は、小型軽量化およ
び低コスト化を実現でき、高波長帯域に亘って十分な収
差補正を行うことができ、しかも、射出瞳の長い超広角
レンズを提案することにある。Therefore, an object of the present invention is to propose a super-wide-angle lens which can realize reduction in size and weight and cost, can sufficiently correct aberrations in a high wavelength band, and has a long exit pupil. Especially.
【0009】[0009]
【課題を解決するための手段】上記の課題を解決するた
めに、本発明の広角レンズは、物体側より順に配置した
負のパワーを持った1群レンズおよび正のパワーを持っ
た2群レンズを有し、前記2群レンズは、絞りを挟み、
物体側に配置されている前群レンズと像面側に配置され
ている後群レンズとを備えており、前記後群レンズは、
絞り側に配置した色消しのための少なくとも1枚のガラ
スレンズからなるガラスレンズ群を備えている。In order to solve the above-mentioned problems, the wide-angle lens of the present invention comprises a first lens group having negative power and a second lens group having positive power, which are arranged in order from the object side. And the second group lens sandwiches a diaphragm,
It comprises a front lens group arranged on the object side and a rear lens group arranged on the image side, wherein the rear lens group is
A glass lens group including at least one glass lens for achromatism arranged on the diaphragm side is provided.
【0010】また、全レンズ系を構成しているレンズ群
のうち少なくとも3枚のレンズを好ましくはプラスチッ
クレンズとしている。At least three lenses of the lens group constituting the entire lens system are preferably plastic lenses.
【0011】さらに、これら3枚のレンズのレンズ面の
うち、少なくとも4面は非球面とし、前記前群レンズに
はアッベ数の小さいレンズを用い、ガラスレンズ群によ
る色消し補正を行うようにしている。Further, among the lens surfaces of these three lenses, at least four surfaces are aspherical surfaces, a lens having a small Abbe number is used as the front lens group, and achromatic correction is performed by the glass lens group. There is.
【0012】この構成によれば、本来補正の難しい近赤
外領域を含めた倍率の色収差を補正し、良好な各種の収
差補正を実現できる、高画質対応の射出瞳の長い超広角
レンズを実現できる。With this structure, it is possible to realize a super wide-angle lens with a long exit pupil for high image quality, which can correct chromatic aberration of magnification including the near-infrared region, which is originally difficult to correct, and can realize various excellent aberration corrections. it can.
【0013】詳細に説明すると、本発明の広角レンズ
は、前記1群レンズの焦点距離をF1、前記2群レンズ
の焦点距離をF2、前記2群レンズのうち絞りを介して
前側の前記前群レンズの焦点距離をfM、前記後群レン
ズの焦点距離をfR、前記後群レンズの絞り側に配置し
た色消しのためのガラスレンズ群の焦点距離をfR1、
前記後群レンズの像面側のレンズ群の焦点距離をfR
2、前記前群レンズのアッベ数をνdMとしたとき、次
の条件式(1)、(2)、(3)および(4)を満足す
ることを特徴とするものである。
1.6<fR1/fR2<3.7 (1)
1.2<fM/fR<2.2 (2)
0.5<|F1/F2|<1.2 (3)
νdM≦45 (4)More specifically, in the wide-angle lens of the present invention, the focal length of the first lens group is F1, the focal length of the second lens group is F2, and the front lens group on the front side of the second lens group through a diaphragm. The focal length of the lens is fM, the focal length of the rear group lens is fR, the focal length of the glass lens group for achromatism arranged on the diaphragm side of the rear group lens is fR1,
The focal length of the image side lens unit of the rear lens unit is fR
2. When the Abbe number of the front lens group is νdM, the following conditional expressions (1), (2), (3) and (4) are satisfied. 1.6 <fR1 / fR2 <3.7 (1) 1.2 <fM / fR <2.2 (2) 0.5 <| F1 / F2 | <1.2 (3) νdM ≦ 45 (4)
【0014】ここで、条件式(1)は色収差および射出
瞳に関するものであり、上限の3.7を超えると射出瞳
は長くできるが、後群レンズのうち像面側の最終レンズ
群のパワーが強くなり、各収差の補正が困難となると同
時に、軸上および軸外の色収差を良好に保つことができ
なくなる。また、下限値の1.6を下回ると射出瞳の距
離が短くなり、結像面の受光素子に対する周辺部への取
り込み角度が増大し、周辺光量の低下を招くことにな
る。その結果、このような現象を補正するために、電気
的な補正回路(シェーディング補正回路)による調節を
行ったとしても、回路基板が大型化してしまい、コンパ
クト化の要請に合致しないばかりか、コストアップの要
因となってしまう。加えて、軸外の色収差補正および非
点収差の補正が難しく、レンズ系全体の性能を安定させ
ることが難しい。The conditional expression (1) relates to the chromatic aberration and the exit pupil, and if the upper limit of 3.7 is exceeded, the exit pupil can be lengthened, but the power of the final lens group on the image side of the rear lens group. Becomes stronger, and it becomes difficult to correct each aberration, and at the same time, it becomes impossible to keep the on-axis and off-axis chromatic aberration excellent. If the lower limit value of 1.6 is not reached, the distance of the exit pupil becomes short, the angle at which the image plane is taken into the peripheral portion with respect to the light receiving element increases, and the amount of peripheral light decreases. As a result, even if the electric correction circuit (shading correction circuit) is adjusted to correct such a phenomenon, the circuit board becomes large, which does not meet the demand for compactness. It will be a factor of up. In addition, it is difficult to correct off-axis chromatic aberration and astigmatism, and it is difficult to stabilize the performance of the entire lens system.
【0015】条件式(2)は、軸上および軸外の色収差
に関するもので、上限値の2.2を超えると、前群レン
ズのパワーが弱くなり、軸外の倍率の色収差の補正が困
難となり、また、同時に軸上の色収差を良好に保つため
には、絞りの直後に配置された色消しレンズの色収差補
正値を少なくする必要があり、このため各波長(λ=4
00乃至900nm)を理想の像面位置に一致させるこ
とが困難となる。また、下限値の1.2を下回ると前群
レンズのパワーが強くなり、このために各収差の補正が
難しくなると同時に、各レンズの曲率半径が極端に小さ
くなり、加工上の制約もあって良好な性能を保つことが
できない。また、上限値の場合と同様に各波長(400
乃至900nm)を理想の像面位置に一致させることが
難しいばかりか、軸上の色収差及び倍率の色収差を同時
に満たすことが困難となる。Conditional expression (2) relates to on-axis and off-axis chromatic aberrations. If the upper limit value of 2.2 is exceeded, the power of the front lens group becomes weak and it is difficult to correct chromatic aberration of off-axis magnification. In addition, in order to keep the chromatic aberration on the axis good at the same time, it is necessary to reduce the chromatic aberration correction value of the achromatic lens arranged immediately after the aperture. Therefore, for each wavelength (λ = 4
(00 to 900 nm) becomes difficult to match the ideal image plane position. If the lower limit value of 1.2 is not reached, the power of the front lens group becomes strong, which makes it difficult to correct each aberration, and at the same time, the radius of curvature of each lens becomes extremely small, which causes processing restrictions. It cannot keep good performance. In addition, each wavelength (400
(To 900 nm) to an ideal image plane position, and it is difficult to satisfy axial chromatic aberration and lateral chromatic aberration at the same time.
【0016】条件式(3)は、レンズ系の大きさがレン
ズ性能に及ぼす影響の度合いを示すものであり、上限値
の1.2を越えると各レンズ群のパワーは弱くなり、レ
ンズの生産性は良くなるが、レンズ系全体が大きくなる
と同時に、特に、軸外収差のうち、サジタル方向の性能
が劣化する。また、下限値の0.5を下回ると各レンズ
群のパワーが強くなり、レンズ系自身の小型化はできる
が、レンズ性能を確保するためには、高い精度の加工性
が要求されてコストアップの要因となる。Conditional expression (3) shows the degree of influence of the size of the lens system on the lens performance. When the upper limit of 1.2 is exceeded, the power of each lens group becomes weak, and the lens production Although the performance is improved, the size of the entire lens system becomes large, and at the same time, of the off-axis aberrations, the performance in the sagittal direction deteriorates. If the lower limit value of 0.5 is not reached, the power of each lens group becomes strong, and the lens system itself can be downsized, but in order to secure the lens performance, high precision workability is required and cost is increased. It becomes a factor of.
【0017】条件式(4)は、特に、軸外の色収差のう
ち、倍率の色収差を安定させるためのものであり、この
条件を超えると軸上の色収差は小さくできるが、軸外の
倍率の色収差が拡大し、本来の性能を満足することがで
きない。Conditional expression (4) is particularly for stabilizing lateral chromatic aberration among the off-axis chromatic aberrations. If this condition is exceeded, axial chromatic aberration can be reduced, but off-axis lateral aberration can be reduced. Chromatic aberration expands, and the original performance cannot be satisfied.
【0018】本発明の広角レンズによれば、CCDなど
への入射角度を小さく抑えることができるとともに、十
分な色消しにより良好な収差補正ができ、高画質対応と
して小型軽量で安価な超広角レンズを提供できる。According to the wide-angle lens of the present invention, the angle of incidence on the CCD or the like can be suppressed to a small value, satisfactory aberration correction can be performed by sufficient achromatization, and a super-wide-angle lens that is compact, lightweight and inexpensive for high image quality. Can be provided.
【0019】ここで、前記1群レンズを、負のパワーを
持った1枚のレンズ、または負のパワーを持った複数枚
のレンズによって構成することができる。Here, the first group lens can be composed of one lens having a negative power or a plurality of lenses having a negative power.
【0020】[0020]
【発明の実施の形態】以下に、図面を参照して、本発明
を適用した広角レンズの実施例を説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a wide-angle lens to which the present invention is applied will be described below with reference to the drawings.
【0021】各実施例の説明に先立って、図1を参照し
て、本発明による広角レンズの典型的な構成を説明す
る。Prior to the description of each embodiment, a typical configuration of the wide-angle lens according to the present invention will be described with reference to FIG.
【0022】この図に示す広角レンズ100は後述の実
施例1におけるものであり、当該広角レンズ100は、
物体側から順に配列した負のパワーを持った1群レンズ
10および正のパワーを持った2群レンズ20を有して
いる。2群レンズ20は、絞り5を挟み、物体側に配置
されている前群レンズ30と、その反対側(像面側)に
配置されている後群レンズ40とを備えている。この後
群レンズ40は、絞り5の側に配置したガラスレンズ群
50と、像面側に配置したレンズ60を備えている。The wide-angle lens 100 shown in this figure is in Example 1 described later, and the wide-angle lens 100 is
It has a first group lens 10 having negative power and a second group lens 20 having positive power, which are arranged in order from the object side. The second group lens 20 includes a front group lens 30 arranged on the object side and a rear group lens 40 arranged on the opposite side (image surface side) with the diaphragm 5 interposed therebetween. The rear group lens 40 includes a glass lens group 50 arranged on the diaphragm 5 side and a lens 60 arranged on the image plane side.
【0023】本例の1群レンズ10は、2枚の凹レンズ
11、12から構成されており、少なくとも凹レンズ1
2はプラスチックレンズである。2群レンズ20の前群
レンズ30はプラスチックレンズからなる凸の非球面レ
ンズ2からなり、後群レンズ40のガラスレンズ群50
はガラスレンズ31および32からなり、レンズ60は
プラスチックレンズからなる凸の非球面レンズ4からな
っている。The first group lens 10 of this example is composed of two concave lenses 11 and 12, and at least the concave lens 1
2 is a plastic lens. The front lens group 30 of the second lens group 20 is composed of a convex aspherical lens 2 made of a plastic lens, and the glass lens group 50 of the rear lens group 40.
Is composed of glass lenses 31 and 32, and the lens 60 is composed of a convex aspherical lens 4 made of a plastic lens.
【0024】図示の構成では、ガラスレンズ群50は凹
レンズ31と凸レンズ32からなる接合レンズとなって
いるが、凹レンズと凸レンズを分離した構成とすること
もできる。In the illustrated construction, the glass lens group 50 is a cemented lens consisting of a concave lens 31 and a convex lens 32, but it is also possible to separate the concave and convex lenses.
【0025】また、後群レンズ40を構成している凸の
非球面レンズ4と結像面8(受光素子の受光面)との間
には、ローパスフィルタ6とカバーガラス7が配置され
ている。これらのローパスフィルタ6およびカバーガラ
ス7は省略することも可能である。A low-pass filter 6 and a cover glass 7 are arranged between the convex aspherical lens 4 forming the rear lens group 40 and the image forming surface 8 (light receiving surface of the light receiving element). . The low pass filter 6 and the cover glass 7 may be omitted.
【0026】加えて、当然のことながら、上記少なくと
も3枚のプラスチックスによる非球面レンズの全て、ま
たはその一部のレンズをガラスモールドによる非球面レ
ンズに置き換えても、同様の効果を得ることは言うまで
もない。In addition, as a matter of course, even if all or a part of the above-mentioned at least three aspherical lenses made of plastics are replaced with aspherical lenses made of glass mold, the same effect can be obtained. Needless to say.
【0027】ここで、広角レンズを構成しているレンズ
において、それらの各表面を物体側から図において括弧
書きの数字で示すように順番付けし、i番目の表面の曲
率半径をRi、i番目と(i+1)番目の表面の面間距
離をdiとし、i番目の表面の屈折率をNdiとし、i
番目の表面のアッベ数をνdiとする。また、非球面形
状は光軸方向の軸をX、光軸に垂直な高さ方向をH、円
錐係数をk、非球面係数をA、B、C、Dとすると、次
の式(5)により表わされる。Here, in the lens that constitutes the wide-angle lens, the respective surfaces are ordered from the object side as shown by the numbers in parentheses in the figure, and the radius of curvature of the i-th surface is Ri, i-th And the distance between the (i + 1) th surface is di, the refractive index of the ith surface is Ndi, and i
The Abbe number of the second surface is νdi. Further, the aspherical shape has the following formula (5), where X is the axis of the optical axis direction, H is the height direction perpendicular to the optical axis, k is the cone coefficient, and A, B, C, and D are the aspherical coefficients. Is represented by
【0028】[0028]
【数1】 [Equation 1]
【0029】[0029]
【実施例】(実施例1)実施例1に係るレンズ系では、
上述した図1に示すように、1群レンズ10が2枚の負
のレンズにより構成され、物体側より1枚目の負のレン
ズ11にはガラスレンズが使用されている。また、1群
レンズ10における2枚目の負のレンズ12の片面が非
球面とされ、2群レンズ20の前群レンズ30の両面お
よび後群レンズ40の像面側のレンズ4の両面もそれぞ
れ非球面とされている。本例のレンズ系のデータを表
1、2に示し、図3にはその収差図を示し、SAは球面
収差、OSCは正弦条件、ASは非点収差、DISTは
ディストーションをそれぞれ表す。また、非点収差AS
におけるTはタンジェンシャル、Sはサジタルの像面を
表している。実施例1に係る広角レンズの性能は次の通
りである。
明るさ FNo.:1.8
焦点距離 f=1.45mm
水平画角 W=125°
射出瞳 ep=157.48mm(Example) (Example 1) In the lens system according to Example 1,
As shown in FIG. 1 described above, the first group lens 10 is composed of two negative lenses, and a glass lens is used for the first negative lens 11 from the object side. Further, one surface of the second negative lens 12 in the first group lens 10 is an aspherical surface, and both surfaces of the front group lens 30 of the second group lens 20 and both surfaces of the lens 4 on the image side of the rear group lens 40 are respectively formed. It is aspherical. Data of the lens system of this example are shown in Tables 1 and 2, and an aberration diagram thereof is shown in FIG. 3, where SA is spherical aberration, OSC is sine condition, AS is astigmatism, and DIST is distortion. Also, astigmatism AS
In the figure, T represents the tangential and S represents the sagittal image plane. The performance of the wide-angle lens according to Example 1 is as follows. Brightness FNo. : 1.8 Focal length f = 1.45 mm Horizontal angle of view W = 125 ° Exit pupil ep = 157.48 mm
【0030】[0030]
【表1】 [Table 1]
【0031】[0031]
【表2】 [Table 2]
【0032】(実施例2)実施例2に係るレンズ系の構
成は、実施例1と同様に図1に示す通りであるが、1群
レンズ10のうち物体側より1枚目の負のレンズ11は
ガラスレンズとし、2枚目の負のレンズ12の片面と2
群レンズ20の前群レンズ30の両面および後群レンズ
の像面側のレンズ4の片面に非球面を施した。本例のレ
ンズ系のデータを表3、4に示し、図4はその収差図で
ある。Example 2 The configuration of the lens system according to Example 2 is as shown in FIG. 1 similarly to Example 1, but the first negative lens of the first lens group 10 from the object side. 11 is a glass lens, and one surface of the second negative lens 12 and 2
Both surfaces of the front lens group 30 of the group lens 20 and one surface of the lens 4 on the image side of the rear lens group are aspherical. Data of the lens system of this example are shown in Tables 3 and 4, and FIG. 4 is an aberration diagram thereof.
【0033】[0033]
【表3】 [Table 3]
【0034】[0034]
【表4】 [Table 4]
【0035】(実施例3)実施例3に係るレンズ系の構
成は、図1と同様であるが、このレンズ系の収差補正
は、波長域λ=400乃至900nmで良好な補正が得
られるように配慮したもので、実施例1、2と同様に、
1群レンズ10の物体側より1枚目の負のレンズ11は
ガラスレンズとし、1群レンズ10のうち2枚目の負の
レンズ12の片面と2群レンズ20の前群レンズ30お
よび後群レンズ40の像面側のレンズ4の両面に非球面
補正を行った。本例のレンズ系のデータを表5、6に示
し、図5はその収差図である。Example 3 The configuration of the lens system according to Example 3 is the same as that of FIG. 1, but the aberration correction of this lens system is such that good correction can be obtained in the wavelength range λ = 400 to 900 nm. In consideration of the above, as in Examples 1 and 2,
The first negative lens 11 from the object side of the first group lens 10 is a glass lens, and one surface of the second negative lens 12 of the first group lens 10 and the front group lens 30 and the rear group of the second group lens 20. Aspherical surface correction was performed on both surfaces of the lens 4 on the image plane side of the lens 40. Data of the lens system of this example are shown in Tables 5 and 6, and FIG. 5 is an aberration diagram thereof.
【0036】[0036]
【表5】 [Table 5]
【0037】[0037]
【表6】 [Table 6]
【0038】(実施例4、5)実施例4および5に係る
レンズ系の構成は、図2に示すように、1群レンズ10
が1枚のレンズ1から形成されており、このレンズ1の
片面と2群レンズ20の前群レンズ30および後群レン
ズ40の像面側のレンズ4の両面に非球面を施してあ
る。これ以外のレンズ構成は図1における場合と同様で
あるので、対応する部分には同一の符号を付し、それら
の説明は省略するものとする。(Examples 4 and 5) As shown in FIG. 2, the lens system according to Examples 4 and 5 has a first-group lens 10
Is formed of one lens 1, and both surfaces of one surface of this lens 1 and the image side lens 4 of the front lens group 30 and the rear lens group 40 of the second lens group 20 are aspherical. Since the lens configuration other than this is the same as that in the case of FIG. 1, corresponding portions are denoted by the same reference numerals, and description thereof will be omitted.
【0039】実施例4のレンズ系のデータを表7、8に
示し、その収差図を図6に示す。また、実施例5のレン
ズ系のデータを表9、10に示し、その収差図を図7に
示す。Data of the lens system of Example 4 are shown in Tables 7 and 8 and aberration diagrams thereof are shown in FIG. Data of the lens system of Example 5 are shown in Tables 9 and 10, and aberration diagrams thereof are shown in FIG.
【0040】[0040]
【表7】 [Table 7]
【0041】[0041]
【表8】 [Table 8]
【0042】[0042]
【表9】 [Table 9]
【0043】[0043]
【表10】 [Table 10]
【0044】[0044]
【発明の効果】以上説明したように、本発明による広角
レンズでは、物体側より順に配置した負のパワーを持っ
た1群レンズおよび正のパワーを持った2群レンズを有
し、2群レンズは、絞りを挟み、物体側に配置されてい
る前群レンズと像面側に配置されている後群レンズとを
備えており、この後群レンズは、絞り側に配置した色消
しのためのガラスレンズ群を備えている。また、全レン
ズ系を構成しているレンズ群のうち少なくとも3枚のレ
ンズのレンズ面のうち、少なくとも4面は非球面とし、
前群レンズにはアッベ数の小さいレンズを用い、ガラス
レンズ群による色消し補正を行うようにしている。これ
により、本来補正の難しい近赤外領域を含めた倍率の色
収差を補正し、良好な各種の収差補正を実現できる、高
画質対応の射出瞳の長い超広角レンズを実現するように
している。As described above, in the wide-angle lens according to the present invention, the two-group lens has the one-group lens having negative power and the second-group lens having positive power, which are arranged in order from the object side. Includes a front group lens disposed on the object side and a rear group lens disposed on the image side with the diaphragm interposed therebetween. The rear group lens is disposed on the diaphragm side for achromatism. It has a glass lens group. In addition, at least four of the lens surfaces of at least three lenses of the lens groups that form the entire lens system are aspherical surfaces,
A lens with a small Abbe number is used as the front lens group, and achromatic correction is performed by the glass lens group. As a result, it is possible to realize a super wide-angle lens with a long exit pupil for high image quality, which can correct chromatic aberration of magnification including the near-infrared region, which is originally difficult to correct, and can realize various excellent aberration corrections.
【0045】本発明による広角レンズは、小型軽量で、
安価に製造でき、しかも、倍率の色収差が良好に補正さ
れ、射出瞳も十分に長いことが確認された。よって、本
発明によれば、小型軽量で、高画質に対応できる射出瞳
の長い超広角レンズを安価に実現できる。The wide-angle lens according to the present invention is small and lightweight,
It was confirmed that it was possible to manufacture at low cost, the chromatic aberration of magnification was well corrected, and the exit pupil was sufficiently long. Therefore, according to the present invention, it is possible to inexpensively realize a super-wide-angle lens having a long exit pupil, which is compact and lightweight, and can cope with high image quality.
【図1】本発明を適用した広角レンズの典型的な構成を
示す構成図である。FIG. 1 is a configuration diagram showing a typical configuration of a wide-angle lens to which the present invention has been applied.
【図2】本発明を適用した広角レンズの実施例4、5の
構成図である。FIG. 2 is a configuration diagram of Examples 4 and 5 of a wide-angle lens to which the present invention has been applied.
【図3】本発明の実施例1に係るレンズ光学系の諸収差
を表わすグラフである。FIG. 3 is a graph showing various aberrations of the lens optical system according to the first example of the present invention.
【図4】本発明の実施例2に係るレンズ光学系の諸収差
を表わすグラフである。FIG. 4 is a graph showing various aberrations of the lens optical system according to Example 2 of the present invention.
【図5】本発明の実施例3に係るレンズ光学系の諸収差
を表わすグラフである。FIG. 5 is a graph showing various aberrations of the lens optical system according to Example 3 of the present invention.
【図6】本発明の実施例4に係るレンズ光学系の諸収差
を表わすグラフである。FIG. 6 is a graph showing various aberrations of the lens optical system according to Example 4 of the present invention.
【図7】本発明の実施例5に係るレンズ光学系の諸収差
を表わすグラフである。FIG. 7 is a graph showing various aberrations of the lens optical system according to Example 5 of the present invention.
100 広角レンズのレンズ光学系 10 1群レンズ 1、11、12 1群レンズを構成しているレンズ 20 2群レンズ 30、2 前群レンズ 40 後群レンズ 50 後群レンズの前側のガラスレンズ群 31 凹のガラスレンズ 32 凸のガラスレンズ 60、4 後群レンズの後ろ側のレンズ 6 ローパスフィルタ 7 カバーガラス 8 結像面(受光素子の受光面) 100 Wide-angle lens optical system 10 First group lens 1, 11, 12 Lenses constituting the first-group lens 20 second group lens 30, 2 front group lens 40 rear lens group 50 Glass group in front of rear group lens 31 concave glass lens 32 convex glass lens 60,4 Lens behind the rear lens group 6 low pass filter 7 cover glass 8 Image forming surface (light receiving surface of light receiving element)
Claims (2)
った1群レンズおよび正のパワーを持った2群レンズを
有し、 前記2群レンズは、絞りを挟み、物体側に配置されてい
る前群レンズと像面側に配置されている後群レンズとを
備えており、 前記後群レンズは、絞り側に配置した色消しのための少
なくとも1枚のガラスレンズからなるガラスレンズ群を
備えており、 全レンズ系を構成しているレンズ群のうち、少なくとも
3枚のレンズのレンズ面のうち、少なくとも4面は非球
面であり、 前記1群レンズの焦点距離をF1、前記2群レンズの焦
点距離をF2、前記2群レンズのうち絞りを介して前側
の前記前群レンズの焦点距離をfM、前記後群レンズの
焦点距離をfR、前記後群レンズにおける前記ガラスレ
ンズ群の焦点距離をfR1、前記後群レンズにおける像
面側のレンズ群の焦点距離をfR2、前記前群レンズの
アッベ数をνdMとしたとき、次の条件式(1)、
(2)、(3)および(4)を満足することを特徴とす
る広角レンズ。 1.6<fR1/fR2<3.7 (1) 1.2<fM/fR<2.2 (2) 0.5<|F1/F2|<1.2 (3) νdM≦45 (4)1. A first group lens having a negative power and a second group lens having a positive power, which are arranged in order from the object side. The second group lens is arranged on the object side with a diaphragm interposed therebetween. Front lens group and a rear lens group arranged on the image side, wherein the rear lens group is a glass lens group composed of at least one glass lens for achromatism arranged on the diaphragm side. Of the lens groups constituting the entire lens system, at least four of the lens surfaces of at least three lenses are aspherical surfaces, and the focal length of the first group lens is F1, and the second group is The focal length of the lens is F2, the focal length of the front group lens on the front side of the second group lens is fM, the focal length of the rear group lens is fR, and the focus of the glass lens group in the rear group lens is F2. Distance fR1 fR2 the focal length of the lens group on the image side in the rear lens group, when the νdM the Abbe number of the front lens group, the following conditional expression (1),
A wide-angle lens characterized by satisfying (2), (3) and (4). 1.6 <fR1 / fR2 <3.7 (1) 1.2 <fM / fR <2.2 (2) 0.5 <| F1 / F2 | <1.2 (3) νdM ≦ 45 (4)
または負のパワーを持った複数枚のレンズによって構成
されていることを特徴とする広角レンズ。2. The lens according to claim 1, wherein the first group lens is one lens having negative power,
Alternatively, a wide-angle lens characterized by being composed of a plurality of lenses having negative power.
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