JP2002244031A - Wide-angle lens - Google Patents

Wide-angle lens

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Publication number
JP2002244031A
JP2002244031A JP2001045125A JP2001045125A JP2002244031A JP 2002244031 A JP2002244031 A JP 2002244031A JP 2001045125 A JP2001045125 A JP 2001045125A JP 2001045125 A JP2001045125 A JP 2001045125A JP 2002244031 A JP2002244031 A JP 2002244031A
Authority
JP
Japan
Prior art keywords
lens
group
group lens
wide
angle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2001045125A
Other languages
Japanese (ja)
Other versions
JP4700821B2 (en
JP2002244031A5 (en
Inventor
Yoji Kubota
洋治 久保田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nagano Optics Laboratory Corp
Original Assignee
Nagano Optics Laboratory Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nagano Optics Laboratory Corp filed Critical Nagano Optics Laboratory Corp
Priority to JP2001045125A priority Critical patent/JP4700821B2/en
Publication of JP2002244031A publication Critical patent/JP2002244031A/en
Publication of JP2002244031A5 publication Critical patent/JP2002244031A5/ja
Application granted granted Critical
Publication of JP4700821B2 publication Critical patent/JP4700821B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a wide-angle lens made small in size and light in weight, manufactured at low cost and having a long exit pupil. SOLUTION: The lens optical system 100 of the wide-angle lens is provided with a 1st group lens 10 having negative power and a 2nd group lens 20 having positive power arranged in order from an object side. The 2nd group lens 20 is equipped with a front group lens 30 arranged on the object side and a rear group lens 40 arranged on an opposite side while putting a diaphragm 5 in between, and at least three surfaces of the lens surfaces of the lens groups constituting an entire lens system are made aspherical. When it is assumed that the focal distance of the 1st group lens 10 is F1, the focal distance of the 2nd group lens 20 is F2, the focal distance of the front group lens 30 is (fm), the focal distance of the rear group lens 40 is fR, the focal distance of the entire lens system is Fo, and the Abbe number of the front group lens 30 is ν dm, they satisfy following conditional expressions (1), (2) and (3). (1) 0.5<fm/fR<3.0, (2) νdm<45 (3) 0.5<|F1/F2|<3.0.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【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、監視用カメラ、携
帯電話搭載カメラ等に用いられる小型で軽量な後側焦点
距離の長い広角レンズに関するものである。The present invention relates to a CCD or a CMOS.
The present invention relates to a small and lightweight wide-angle lens having a long rear focal length used for a vehicle-mounted camera, a surveillance camera, a camera mounted on a mobile phone, and the like using a light receiving element such as the above.

【０００２】[0002]

【従来の技術】最近、自動車等の後方確認や、携帯電話
等に用いられる小型で高性能な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。ここで、これらの広角レンズを用いる小型カメラ
の受光素子にはほとんどＣＣＤやＣＭＯＳが用いられて
おり、これらの受光素子の特徴として、各画素に取り込
める光線角度に制約がある。この性能を無視するような
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 has been a demand for a super-wide-angle lens having a small and high-performance image capturing angle exceeding 100 degrees in a horizontal direction, which is used in a rear view of an automobile or the like or a mobile phone. Here, CCDs and CMOSs are mostly used as light-receiving elements of small cameras using these wide-angle lenses, and as a feature of these light-receiving elements, there is a restriction on a light beam angle that can be captured by each pixel. In a camera in which an optical system that ignores this performance is incorporated, the amount of peripheral light decreases sharply, 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。ところが、この方式では回
路基板が大型化し、小型・コンパクト化の要望に合致し
ないことがある。電気的な補正以外としては、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になり、実用性に乏しい。In order to correct such a phenomenon, a system incorporating an electric correction circuit (shading correction circuit) is generally employed. However, in this method, the size of the circuit board is increased, and the circuit board may not meet the demand for downsizing. As a method other than the electrical correction, a method has been proposed in which a microlens paired with a light receiving element is arranged to increase the light receiving angle on the element surface. However, this method requires a great deal of cost and is not practical.

【０００４】そこで、近年においては、これらの課題を
レンズ系によって対応しようとする試みが一般化され、
多くの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。この他にも、小型、軽量
化を目的とした物体側より順に凹非球面レンズと、凸非
球面レンズの２枚の非球面レンズを用いた提案もある。
さらに、このレンズ系における凹非球面レンズと凸非球
面レンズの間に色補正のための接合レンズを介在させた
構成としたものも提案されている。[0004] In recent years, attempts to address these problems with a lens system have been generalized.
The performance is adjusted by using a large number of spherical lenses, and a lens with a long exit pupil is realized. In addition, there is a proposal using two aspheric lenses, a concave aspheric lens and a convex aspheric lens in order from the object side for the purpose of reducing the size and weight.
Further, there has been proposed a configuration in which a cemented lens for color correction is interposed between a concave aspheric lens and a convex aspheric lens in this lens system.

【０００５】[0005]

【発明が解決しようとする課題】しかしながら、多数枚
の球面ガラスレンズを用いて、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
てしまい、実用的でない。However, when an attempt is made to realize a wide-angle lens having a high performance and a long exit pupil by using a large number of spherical glass lenses, the total cost of the lens optical system becomes extremely high. However, it becomes large and is not practical.

【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
押さえることも困難であり、結果的におのずとその用途
に限界が生ずる。Further, in a method using two aspherical lenses, a concave lens and a convex lens, for the purpose of reducing the size and weight, it is difficult not only to obtain a long exit pupil but also to suppress chromatic aberration of magnification. As a result, its use is naturally limited.

【０００７】さらに、色補正のための接合レンズを凹レ
ンズと凸レンズの２枚の非球面レンズの間に挿入した構
成のものでは、長い射出瞳を得ることができないという
欠点がある。[0007] Further, in a configuration in which a cemented lens for color correction is inserted between two aspheric lenses, a concave lens and a convex lens, there is a disadvantage that a long exit pupil cannot be obtained.

【０００８】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、軽量で低コストで、しかも
倍率の色収差を抑えることができ、さらには長い射出瞳
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, any of these types of wide-angle lenses can be small, lightweight, low-cost, can suppress chromatic aberration of magnification, and simultaneously satisfy the demand for obtaining a long exit pupil. It is extremely difficult.

【０００９】そこで、本発明の課題は、小型・軽量で、
低コストであり、倍率の色収差補正が可能であり、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 reduce the size and weight of
An object of the present invention is to propose an ultra-wide-angle lens which is low in cost, capable of correcting chromatic aberration of magnification, and has a long exit pupil.

【００１０】[0010]

【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、反対側に配置さ
れている後群レンズとを備えており、全レンズ系を構成
しているレンズ群のレンズ面のうち３面は非球面とされ
ており；前記前群レンズには、アッベ数の小さいレンズ
を用いて、本来補正が難しい倍率の色収差を補正し、同
時に、射出瞳の長い超広角レンズとなるように配慮した
ことを特徴としている。In order to solve the above-mentioned problems, a wide-angle lens according to the present invention comprises a first-group lens having negative power and a second-group lens having positive power arranged in order from the object side. And the second group lens has a diaphragm interposed therebetween,
It has a front lens group disposed on the object side and a rear lens group disposed on the opposite side, and three of the lens surfaces of the lens groups constituting the entire lens system are aspherical. A lens having a small Abbe number is used for the front group lens to correct chromatic aberration of magnification, which is originally difficult to correct, and at the same time, to provide an ultra-wide-angle lens having a long exit pupil. .

【００１１】すなわち、本発明の広角レンズでは、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，全レンズ系の焦点距離をＦｏ
とし、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）および（３）を満足すること
を特徴とするものである。That is, in the wide-angle lens according to the present invention, the focal length of the first lens unit is F1, the focal length of the second lens unit is F2, the focal length of the front lens unit is fm, and the focal length of the rear lens unit is Fm. fR, the focal length of all lens systems is Fo
When the Abbe number of the front lens is νdm,
It is characterized by satisfying the following conditional expressions (1), (2) and (3).

【００１２】 ０．５ ＜ｆｍ／ｆＲ＜ ３．０ （１） νｄｍ ＜ ４５ （２） ０．５＜｜Ｆ１／Ｆ２｜＜３．０ （３） ここで、条件式（１）は倍率の色収差および射出瞳を制
限するものである。上限値３．０を超えると倍率の色収
差のうち、短波長の倍率が一方向へ増加し、画面周辺部
での青色の色ずれが発生すると共に、軸外のサジタル像
が＋方向に増大し、画面の周辺部で非点収差が発生す
る。また、下限値０．５を下回ると、射出瞳の距離が短
くなり、軸外光のＣＣＤ素子などへの入射角が増大し、
この結果、周辺光量の減少を招くことになるばかりか、
後側焦点距離が短くなり、本来の目的を達成できない。
また、軸外の短波長像面が一方向に増大し、結像性能を
阻害し、高性能な画像を得ることができない。0.5 <fm / fR <3.0 (1) νdm <45 (2) 0.5 <| F1 / F2 | <3.0 (3) where conditional expression (1) is This limits chromatic aberration and exit pupil. When the value exceeds the upper limit of 3.0, the short-wavelength magnification of the chromatic aberration of magnification increases in one direction, blue color shift occurs at the periphery of the screen, and the off-axis sagittal image increases in the + direction. Astigmatism occurs in the peripheral portion of the screen. When the lower limit value is less than 0.5, the distance of the exit pupil becomes short, and the incident angle of off-axis light to a CCD element or the like increases,
As a result, not only does the amount of peripheral light decrease,
The rear focal length becomes short, and the original purpose cannot be achieved.
In addition, the off-axis short-wavelength image plane increases in one direction, impairing the imaging performance, and making it impossible to obtain high-performance images.

【００１３】条件式（２）は色収差の補正に関するもの
である。この条件を満たさない範囲では、倍率の色収差
のうち、短波長の軸外色収差が増大し、その結果、周辺
部に青色の色ずれが発生し、本来の性能を満たすことが
できない。特に、軸上の色収差および軸外の色収差は短
波長に関して相反方向にあるので、設計上十分な注意が
必要である。Conditional expression (2) relates to correction of chromatic aberration. In a range that does not satisfy this condition, of the chromatic aberration of magnification, off-axis chromatic aberration of short wavelength increases, and as a result, blue color shift occurs in the peripheral portion, and the original performance cannot be satisfied. In particular, since the on-axis chromatic aberration and the off-axis chromatic aberration are in opposite directions with respect to the short wavelength, sufficient care must be taken in designing.

【００１４】条件式（３）は後側焦点距離の制約と光学
特性を制限するものである。上限値３．０を超えると、
後側焦点距離が小さくなり、また、長い後側焦点距離を
持った短焦点レンズを作ることができないと共に、像面
の湾曲が増大するばかりでなく、当初の目的である画像
取り込み角度の大幅な減少を招くことになる。次に、下
限値０．５を下回ると、後側焦点距離は長くできるが、
光学系全体の小型化を達成することができない。また、
軸外の非点収差が増大し、結像性能を劣化させることに
なると共に、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安定的な性能を保つことができな
い。Conditional expression (3) restricts the restriction on the rear focal length and the optical characteristics. If the upper limit of 3.0 is exceeded,
The rear focal length is reduced, and a short focal length lens with a long rear focal length cannot be made. Not only does the curvature of the image plane increase, but also the initial image capture angle, This will lead to a decrease. Next, when the value goes below the lower limit of 0.5, the rear focal length can be increased.
The miniaturization of the entire optical system cannot be achieved. Also,
Off-axis astigmatism increases, deteriorating the imaging performance, and the radius of curvature of each lens becomes extremely small.
Stable performance cannot be maintained due to processing restrictions.

【００１５】本発明の広角レンズによれば、ＣＣＤ等へ
の入射角度を小さく抑えることができると共に、プラス
チックレンズやガラスモールドレンズ等の非球面レンズ
を使用して、小型・軽量で廉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 a CCD or the like can be suppressed to a small value, and an aspherical lens such as a plastic lens or a glass molded lens is used, so that a small, lightweight and inexpensive ultra-wide angle lens is used. Can provide lenses.

【００１６】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 constituted by one lens having a negative power or a plurality of lenses having a negative power.

【００１７】また、前記２群レンズを２枚または３枚の
レンズで構成することができ、当該２群レンズの前記後
群レンズを、１枚のレンズ、２枚の接合レンズ、または
２枚の分離したレンズで構成することができる。Further, the second group lens can be constituted by two or three lenses, and the rear group lens of the two group lens is replaced by one lens, two cemented lenses, or two lenses. It can be composed of separate lenses.

【００１８】[0018]

【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。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a wide-angle lens according to the present invention will be described below with reference to the drawings.

【００１９】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。この図に示す広角レンズは後述の実施例１における
ものであり、当該広角レンズ１００は、物体側より順に
配置した負のパワーをもった１群レンズ１０および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、反対
側に配置されている後群レンズ４０とを備えている。Prior to the description of each embodiment, a typical configuration of a wide-angle lens according to the present invention will be described with reference to FIG. The wide-angle lens shown in this figure is that in Example 1 described later, and the wide-angle lens 100 has a first-group lens 10 and a second-group lens 20 having negative power and arranged in order from the object side. The second group lens 20 includes a front lens group 30 disposed on the object side with the diaphragm 5 interposed therebetween, and a rear lens group 40 disposed on the opposite side.

【００２０】本例の１群レンズ１０は１枚の凹の非球面
レンズ１からなり、２群レンズ２０の前群レンズ３０は
凸の非球面レンズ２からなり、後群レンズ４０は分離さ
れた２枚のレンズ３からなり、当該分離されたレンズ３
は、凹の球面レンズ３１と凸の非球面レンズ３２から構
成されている。The first group lens 10 of this embodiment comprises one concave aspheric lens 1, the front group lens 30 of the second group lens 20 comprises a convex aspheric lens 2, and the rear group lens 40 is separated. The separated lens 3 is composed of two lenses 3.
Is composed of a concave spherical lens 31 and a convex aspheric lens 32.

【００２１】尚、本発明の実施例においては、後群レン
ズ４０については、凹レンズと凸レンズとが接合された
もの、分離されたもの、及び１枚の凸レンズにて説明し
ているが、勿論、凸レンズと凹レンズに分離したもので
あっても差し支えないことを付記しておく。In the embodiment of the present invention, the rear group lens 40 is described as a cemented concave lens and a convex lens, a separated lens, and a single convex lens. It should be noted that a lens separated into a convex lens and a concave lens may be used.

【００２２】また、後群レンズ４０を構成している凸の
非球面レンズ３２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 aspheric lens 32 constituting the rear group lens 40 and the imaging surface 8 (light receiving surface of the light receiving element). . The low-pass filter 6 and the cover glass 7 can be omitted.

【００２３】ここで、各光学素子１ないし７において、
図１に示すように、それらの表面の曲率半径を物体側か
らＲ１ないしＲｎ、面間距離をｄ１ないしｄｎとし、屈
折率をＮｄ１ないしＮｄｎとし、アッベ数をνｄ１ない
しνｄｎとする。また、非球面形状は光軸方向の軸を
Ｘ、光軸と垂直方向の高さをＨ、円錐係数をｋ、非球面
係数をＡ、Ｂ、Ｃ、Ｄとするとき、次の式（４）により
表わされる。Here, in each of the optical elements 1 to 7,
As shown in FIG. 1, the radii of curvature of the surfaces are R1 to Rn from the object side, the distances between the surfaces are d1 to dn, the refractive indices are Nd1 to Ndn, and the Abbe numbers are νd1 to νdn. When the axis in the optical axis direction is X, the height in the direction perpendicular to the optical axis is H, the conic coefficient is k, and the aspheric coefficients are A, B, C, and D, the aspheric surface shape is expressed by the following equation (4). ).

【００２４】[0024]

【数１】 (Equation 1)

【００２５】[0025]

【実施例１】実施例１に係るレンズ系は、図１に示すよ
うに、２群レンズ２０の後群レンズ４０を構成している
負のパワーを持った凹の球面レンズ３１と正のパワーを
持った凸の非球面レンズ３２を分離した形式のものであ
る。本例では、１群レンズ１０の凹レンズ１の片面と２
群レンズ２０を構成している非球面レンズ２の両面、凸
の非球面レンズ３２の両面の合計５面が非球面とされて
いる。本例のレンズ系のデータを表１に示し、図２には
その収差図を示す。Embodiment 1 As shown in FIG. 1, a lens system according to Embodiment 1 has a concave spherical lens 31 having negative power and a positive power which constitute a rear group lens 40 of a second group lens 20. Is a type in which a convex aspherical lens 32 having the following is separated. In this example, one surface of the concave lens 1 of the first group lens 10 and 2
A total of five surfaces including the two surfaces of the aspheric lens 2 and the two surfaces of the convex aspheric lens 32 constituting the group lens 20 are aspheric. Table 1 shows data of the lens system of this example, and FIG. 2 shows an aberration diagram thereof.

【００２６】[0026]

【表１】 [Table 1]

【００２７】[0027]

【実施例２】実施例２に係るレンズ系は、図３に示すよ
うに、２群レンズ２０の後群レンズ４０を構成している
負のパワーを持った凹の球面レンズ３１と正のパワーを
持った凸の球面レンズ３２を接合した形式のものであ
る。そのデータを表２に示し、図４にはその収差図を示
す。Embodiment 2 As shown in FIG. 3, a lens system according to Embodiment 2 includes a concave spherical lens 31 having negative power and a positive power which constitute a rear group lens 40 of the second group lens 20. And a convex spherical lens 32 having The data is shown in Table 2, and FIG. 4 shows the aberration diagram.

【００２８】[0028]

【表２】 [Table 2]

【００２９】[0029]

【実施例３】実施例３に係るレンズ系は、図５に示すよ
うに、負のパワーを持った１群レンズ１０を第１レンズ
１１と第２レンズ１２に分割し、１群レンズ１０のレン
ズ１２の片面を非球面とし、２群レンズ２０の前群レン
ズ３０と後群レンズ４０をそれぞれ１枚の非球面レンズ
２、３とした形式のもので、そのデータを表３に示し、
図６にはその収差図を示す。Embodiment 3 As shown in FIG. 5, the lens system according to Embodiment 3 divides a first group lens 10 having a negative power into a first lens 11 and a second lens 12, and One of the surfaces of the lens 12 is an aspherical surface, and the front group lens 30 and the rear group lens 40 of the second group lens 20 are one aspherical lens 2 and 3, respectively. The data is shown in Table 3.
FIG. 6 shows the aberration diagram.

【００３０】[0030]

【表３】 [Table 3]

【００３１】[0031]

【発明の効果】以上説明したように、本発明に従って構
成した広角レンズは、小型・軽量で、廉価に製造するこ
とができ、しかも、倍率の色収差が補正され、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・軽量で射出瞳の長い高性能な広角レンズを廉
価に実現できる。As described above, the wide-angle lens constructed in accordance with the present invention is small and lightweight, can be manufactured at low cost, and has a sufficient chromatic aberration of magnification and a sufficiently long exit pupil. confirmed. Therefore, according to the present invention, a compact, lightweight, high-performance wide-angle lens with a long exit pupil can be realized at low cost.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明を適用した広角レンズの典型的な構成例
を示す図である。FIG. 1 is a diagram showing a typical configuration example of a wide-angle lens to which the present invention is applied.

【図２】本発明の実施例１に係るレンズ光学系の諸収差
を示すグラフである。FIG. 2 is a graph showing various aberrations of the lens optical system according to Example 1 of the present invention.

【図３】本発明を適用した広角レンズの実施例２の構成
図である。FIG. 3 is a configuration diagram of a wide-angle lens according to a second embodiment 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
を示すグラフである。FIG. 4 is a graph showing various aberrations of the lens optical system according to Example 2 of the present invention.

【図５】本発明を適用した広角レンズの実施例３の構成
図である。FIG. 5 is a configuration diagram of a wide-angle lens according to a third embodiment of the present invention.

【図６】本発明の実施例３に係るレンズ光学系の諸収差
を示すグラフである。FIG. 6 is a graph showing various aberrations of the lens optical system according to Example 3 of the present invention.

【符号の説明】[Explanation of symbols]

１００ 広角レンズのレンズ光学系 １０ １群レンズ １ 凹の非球面レンズ １１、１２ １群レンズを構成しているレンズ ２０ ２群レンズ ３０ 前群レンズ ２ 凸の非球面レンズ ４０ 後群レンズ ３ 接合レンズ ３１ 凹の球面レンズ ３２ 凸の非球面レンズ ５ 絞り 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） REFERENCE SIGNS LIST 100 lens optical system of wide-angle lens 10 1 group lens 1 concave aspheric lens 11, 12 lens forming 1 group lens 20 2 group lens 30 front group lens 2 convex aspheric lens 40 rear group lens 3 cemented lens 31 Concave Spherical Lens 32 Convex Aspheric Lens 5 Aperture 6 Low Pass Filter 7 Cover Glass 8 Image Forming Surface (Light Receiving Surface of Light Receiving Element)

【手続補正書】[Procedure amendment]

【提出日】平成１３年３月１３日（２００１．３．１
３）[Submission date] March 13, 2001 (2001.3.1.
3)

【手続補正１】[Procedure amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】００２１[Correction target item name] 0021

【補正方法】変更[Correction method] Change

【補正内容】[Correction contents]

【００２１】尚、本発明の実施例においては、後群レン
ズ４０については、凹レンズと凸レンズとが接合された
もの、分離されたもの、及び１枚の凸レンズにて説明し
ているが、勿論、凸レンズと凸レンズに分離したもので
あっても差し支えないことを付記しておく。In the embodiment of the present invention, the rear group lens 40 is described as a cemented concave lens and a convex lens, a separated lens, and a single convex lens. It should be noted that a convex lens and a lens separated into convex lenses may be used.

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 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、反対側に配置されている後群レンズと
を備えており、全レンズ系を構成しているレンズ群のレ
ンズ面のうち３面は非球面とされており、 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，全レンズ系の焦点距離を
Ｆｏとし、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）および（３）を満足する
ことを特徴とする広角レンズ。 ０．５ ＜ｆｍ／ｆＲ＜ ３．０ （１） νｄｍ ＜ ４５ （２） ０．５＜｜Ｆ１／Ｆ２｜＜３．０ （３）1. A first group lens having negative power and a second group lens having positive power arranged in order from the object side, wherein the second group lens is disposed on the object side with a diaphragm interposed therebetween. A front lens group, and a rear lens group disposed on the opposite side. Three of the lens surfaces of the lens groups constituting the entire lens system are aspherical. The focal length of the lens is F1, the focal length of the second lens group is F2, the focal length of the front lens group is fm, the focal length of the rear lens group is fR, and the focal length of all lens systems is Fo. A wide-angle lens characterized by satisfying the following conditional expressions (1), (2) and (3) when the Abbe number of the lens is νdm. 0.5 <fm / fR <3.0 (1) νdm <45 (2) 0.5 <| F1 / F2 | <3.0 (3) 【請求項２】 請求項１において、 前記１群レンズは、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
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 lens unit is a single lens having negative power.
Or a wide-angle lens comprising a plurality of lenses having negative power. 【請求項３】 請求項１または２において、 前記２群レンズは２枚または３枚のレンズで構成されて
おり、 当該２群レンズの前記後群レンズは、１枚のレンズ、２
枚の接合レンズ、または２枚の分離したレンズで構成さ
れていることを特徴とする広角レンズ。3. The two-group lens according to claim 1, wherein the second group lens is composed of two or three lenses, and the rear group lens of the two-group lens is one lens,
A wide-angle lens comprising two cemented lenses or two separated lenses.
JP2001045125A 2001-02-21 2001-02-21 Wide angle lens Expired - Lifetime JP4700821B2 (en)

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