JP2001194589A - Photographing lens system - Google Patents
Photographing lens systemInfo
- Publication number
- JP2001194589A JP2001194589A JP2000349079A JP2000349079A JP2001194589A JP 2001194589 A JP2001194589 A JP 2001194589A JP 2000349079 A JP2000349079 A JP 2000349079A JP 2000349079 A JP2000349079 A JP 2000349079A JP 2001194589 A JP2001194589 A JP 2001194589A
- Authority
- JP
- Japan
- Prior art keywords
- refractive power
- lens
- photographing lens
- group
- lens system
- 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
Links
Landscapes
- Lenses (AREA)
- Solid State Image Pick-Up Elements (AREA)
Abstract
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、撮影レンズ装置に
関するものである。更に詳しくは、固体撮像素子を用い
たカメラに好適な、コンパクトな撮影レンズ装置に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing lens device. More specifically, the present invention relates to a compact photographing lens device suitable for a camera using a solid-state imaging device.
【０００２】[0002]
【従来の技術】撮影レンズ系を射出した画像光を複数の
受光素子が配列された固体撮像素子で受光することによ
り被写体を撮影する、ビデオカメラやテレビカメラ等の
カメラにおいては、各受光素子の受光効率を上げるた
め、各受光素子の入射面側に集光性のマイクロレンズが
設けられている。マイクロレンズによる集光性を上げる
ためには、マイクロレンズに入射する光束がマイクロレ
ンズの光軸に平行であることが望ましい。そのために
は、撮影レンズ系の射出瞳が略無限遠に位置する、即ち
撮影レンズ系が略テレセントリックであることが必要に
なる。2. Description of the Related Art In a camera such as a video camera or a television camera, a subject is photographed by receiving image light emitted from a photographic lens system by a solid-state image sensor having a plurality of light receiving elements arranged therein. In order to increase the light receiving efficiency, a light collecting microlens is provided on the incident surface side of each light receiving element. In order to improve the light collecting property of the microlens, it is desirable that the light beam incident on the microlens be parallel to the optical axis of the microlens. For that purpose, it is necessary that the exit pupil of the taking lens system is located at almost infinity, that is, the taking lens system is substantially telecentric.
【０００３】[0003]
【発明が解決しようとする課題】一方、カメラの小型化
を図るため、撮影レンズ系のの全長を短くすることが求
められている。ところが、撮影レンズ系を短縮するとそ
の射出瞳が像面に近付いてしまう。撮影レンズ系の射出
瞳が像面に近付くと軸外光束はマイクロレンズにたいし
て斜めに入射するようになる。その結果、マイクロレン
ズの集光性が低下し、固体撮像素子に撮影される画像の
中心部と周辺部とで画像の明るさが変化してしまう。On the other hand, in order to reduce the size of the camera, it is required to shorten the entire length of the taking lens system. However, when the photographing lens system is shortened, the exit pupil approaches the image plane. When the exit pupil of the taking lens system approaches the image plane, the off-axis light flux enters the micro lens obliquely. As a result, the light condensing property of the microlens is reduced, and the brightness of the image changes between the central portion and the peripheral portion of the image captured by the solid-state imaging device.
【０００４】本発明はこの様な状況に鑑みてなされたも
のであって、射出瞳が略無限遠に位置すると共に、全長
が短い撮影レンズ系を備えた撮影レンズ装置を提供する
ことを目的とする。The present invention has been made in view of such a situation, and an object of the present invention is to provide a photographing lens device having a photographing lens system in which an exit pupil is located at approximately infinity and whose overall length is short. I do.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
本発明は、物体側より順に、撮影レンズ系と、撮影レン
ズ系から射出された画像光を受光する複数の受光素子が
配列された固体撮像素子と、を備えた撮影レンズ装置で
あって、前記撮影レンズ系は、物体側より順に、全体と
して負の屈折力を有し、最も物体側に設けられた負の屈
折力を有するレンズを含む２枚のレンズで構成された第
１群と、正の屈折力を有する第２群と、正の屈折力を有
する1枚のレンズからなる第３群とから構成されてお
り、前記撮影レンズ系はズームレンズ系であって、前記
第３群を固定させ、第１群と第２群を移動させることに
よって変倍を行うことを特徴とする。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides, in order from the object side, a solid state in which a photographic lens system and a plurality of light receiving elements for receiving image light emitted from the photographic lens system are arranged. An imaging element, wherein the imaging lens system has a negative refractive power as a whole, in order from the object side, and a lens having a negative refractive power provided closest to the object side. The photographing lens, comprising: a first group composed of two lenses including a first lens group, a second group having a positive refractive power, and a third group composed of one lens having a positive refractive power. The system is a zoom lens system, wherein the zooming is performed by fixing the third unit and moving the first and second units.
【０００６】[0006]
【発明の実施の形態】図１〜３は、本発明を実施したズ
ームレンズの第１乃至第３実施形態の、無限遠合焦状態
でのレンズ配置を示している。各図において矢印ｍ１〜
ｍ２は、広角端から望遠端へのズーミングにおける各レ
ンズ群Ｇｒ１〜２の移動を模式的に示している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 3 show lens arrangements of a first to third embodiments of a zoom lens embodying the present invention in an infinity in-focus state. Arrows m1 to m1
m2 schematically shows the movement of each lens group Gr1-2 during zooming from the wide-angle end to the telephoto end.
【０００７】第１乃至第３実施例はいずれも、物体側か
ら順に、負の屈折力を有する第１レンズ群Ｇｒ１、絞り
Ａ、正の屈折力を有する第２レンズ群Ｇｒ２からなる主
光学系と、ローパスフィルターＬＰと、正の屈折力を有
するコンデンサーレンズＬＣとから構成されている。In each of the first to third embodiments, the main optical system includes, in order from the object side, a first lens unit Gr1 having a negative refractive power, a stop A, and a second lens unit Gr2 having a positive refractive power. , A low-pass filter LP, and a condenser lens LC having a positive refractive power.
【０００８】広角端から望遠端へのズーミングにおい
て、第１レンズ群Ｇｒ１は、広角端から中間焦点距離状
態にかけては像側へ移動し、中間焦点距離状態から望遠
端にかけては物体側に移動する。また、絞りＡ及び第２
レンズ群Ｇｒ２は、広角端から望遠端にかけて、一貫し
て物体側へ移動する。In zooming from the wide-angle end to the telephoto end, the first lens unit Gr1 moves to the image side from the wide-angle end to the intermediate focal length state, and moves to the object side from the intermediate focal length state to the telephoto end. Also, the diaphragm A and the second
The lens group Gr2 moves to the object side consistently from the wide-angle end to the telephoto end.
【０００９】第１実施形態の第１レンズ群Ｇｒ１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と、物体側に凸面を向けた負メニスカスレンズＬ２
と、物体側に凸面を向けた正メニスカスレンズＬ３とか
らなる。The first lens group Gr1 of the first embodiment includes, in order from the object side, a negative meniscus lens L1 having a convex surface facing the object side and a negative meniscus lens L2 having a convex surface facing the object side.
And a positive meniscus lens L3 having a convex surface facing the object side.
【００１０】第１実施形態の第２レンズ群Ｇｒ２は物体
側から順に、両凸レンズＬ４と、物体側に凸面を向けた
正メニスカスレンズＬ５と、両凹レンズＬ６と、両凸レ
ンズＬ７とからなる。The second lens group Gr2 of the first embodiment includes, in order from the object side, a biconvex lens L4, a positive meniscus lens L5 having a convex surface facing the object side, a biconcave lens L6, and a biconvex lens L7.
【００１１】第１実施形態のコンデンサーレンズＬＣ
は、凸平形状である。The condenser lens LC according to the first embodiment
Is a convex flat shape.
【００１２】第２実施形態の第１レンズ群Ｇｒ１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と、物体側に凸面を向けた正メニスカスレンズＬ２
とからなる。The first lens group Gr1 of the second embodiment includes, in order from the object side, a negative meniscus lens L1 having a convex surface facing the object side and a positive meniscus lens L2 having a convex surface facing the object side.
Consists of
【００１３】第２実施形態の第２レンズ群Ｇｒ２は物体
側から順に、物体側に凸面を向けた正メニスカスレンズ
Ｌ３と、物体側に凹面を向けた負メニスカスレンズＬ４
とからなる。The second lens group Gr2 of the second embodiment includes, in order from the object side, a positive meniscus lens L3 having a convex surface facing the object side and a negative meniscus lens L4 having a concave surface facing the object side.
Consists of
【００１４】第２実施形態のコンデンサーレンズＬＣ
は、平凸形状である。Condenser lens LC of second embodiment
Is a plano-convex shape.
【００１５】第３実施形態の第１レンズ群Ｇｒ１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と、物体側に凸面を向けた正メニスカスレンズＬ２
とからなる。The first lens group Gr1 of the third embodiment includes, in order from the object side, a negative meniscus lens L1 having a convex surface facing the object side and a positive meniscus lens L2 having a convex surface facing the object side.
Consists of
【００１６】第３実施形態の第２レンズ群Ｇｒ２は物体
側から順に、物体側に凸面を向けた両凸レンズＬ３と、
物体側に凹面を向けた負メニスカスレンズＬ４とからな
る。The second lens unit Gr2 of the third embodiment includes, in order from the object side, a biconvex lens L3 having a convex surface facing the object side;
A negative meniscus lens L4 having a concave surface facing the object side.
【００１７】第３実施形態のコンデンサーレンズＬＣ
は、平凸形状である。Condenser lens LC of the third embodiment
Is a plano-convex shape.
【００１８】本発明では、主光学系と像面との間にコン
デンサーレンズを配置することにより、コンデンサーレ
ンズが配置されていない場合よりも、撮影光学系の射出
瞳を像面から遠ざけることができる。コンデンサーレン
ズの屈折力は主光学系の射出瞳位置に合わせて適宜設定
すればよい。主光学系の射出瞳位置が像面に近いほど、
コンデンサーレンズの屈折力を強くすることにより、コ
ンデンサーレンズが撮影光学系の射出瞳位置を像面から
遠ざける作用を強くすればよい。また、上記各実施形態
の如く撮影レンズ系がズームレンズである場合、ズーミ
ングに伴って射出瞳が光軸方向に移動するので、広角端
での射出瞳位置と望遠端での射出瞳位置とをバランスさ
せる必要がある。In the present invention, by disposing a condenser lens between the main optical system and the image plane, the exit pupil of the photographing optical system can be made farther from the image plane than when no condenser lens is disposed. . The refractive power of the condenser lens may be appropriately set according to the position of the exit pupil of the main optical system. The closer the exit pupil position of the main optical system is to the image plane,
By increasing the refractive power of the condenser lens, the action of the condenser lens for moving the exit pupil position of the photographing optical system away from the image plane may be increased. Further, when the photographing lens system is a zoom lens as in the above embodiments, the exit pupil moves in the optical axis direction with zooming, so that the exit pupil position at the wide-angle end and the exit pupil position at the telephoto end are different. It needs to be balanced.
【００１９】また、コンデンサーレンズの少なくとも１
面は非球面とするのが望ましい。コンデンサーレンズの
少なくとも１面は非球面とすると、諸収差、特に歪曲収
差と像面湾曲とを良好に補正することができる。Also, at least one of the condenser lenses
Preferably, the surface is aspheric. If at least one surface of the condenser lens is an aspherical surface, various aberrations, particularly, distortion and field curvature can be favorably corrected.
【００２０】次に、本発明に係る撮影レンズ系が満足す
るのが望ましい条件式を説明する。Next, a description will be given of conditional expressions which are preferably satisfied by the taking lens system according to the present invention.
【００２１】負の屈折力を有する第１群、正の屈折力を
有する第２群で構成された主光学系と、該主光学系と像
面との間に設けられた正の屈折力を有するコンデンサー
レンズとを備えた撮影レンズ系は次の条件式（１）及び
／又は（２）を満足するのが望ましい。A main optical system composed of a first group having a negative refractive power and a second group having a positive refractive power, and a positive refractive power provided between the main optical system and the image plane. It is preferable that the taking lens system including the condenser lens satisfy the following conditional expressions (1) and / or (2).
【００２２】 −６．０ ＜ φ１／φＣ ＜ −１．２ ・・・（１） １．２ ＜ φ２／φＣ ＜ ６．０ ・・・（２） ここで、φ１：第１群の屈折力、φ２：第２群の屈折
力、φＣ：コンデンサーレンズの屈折力、である。−6.0 <φ1 / φC <−1.2 (1) 1.2 <φ2 / φC <6.0 (2) where φ1: the refractive power of the first lens unit , Φ2: refractive power of the second group, φC: refractive power of the condenser lens.
【００２３】条件式（１）は、主光学系の射出瞳位置に
大きく関与する第１群の屈折力とコンデンサーレンズの
屈折力との比を規定する式である。条件式（１）の上限
を上回って第１群の屈折力が強くなると、射出瞳は像面
から遠く離れるが、主光学系の諸収差、特に負の歪曲収
差及び球面収差の補正が困難になる。逆に、条件式
（１）の下限を下回って第１群の屈折力が弱くなると、
主光学系の射出瞳位置が像面に近付くため、コンデンサ
ーレンズの屈折力を強くする必要が生じる。しかしなが
ら、コンデンサーレンズの屈折力を強くするとコンデン
サーレンズでは発生する諸収差、特に負の歪曲収差と像
面の正方向への倒れを主光学系で補正することが困難に
なる。Conditional expression (1) defines the ratio between the refractive power of the first group and the refractive power of the condenser lens, which greatly affects the exit pupil position of the main optical system. If the refractive power of the first lens unit is increased above the upper limit of conditional expression (1), the exit pupil will be far away from the image plane, but it will be difficult to correct various aberrations of the main optical system, particularly negative distortion and spherical aberration. Become. Conversely, if the lower limit of conditional expression (1) is exceeded and the refractive power of the first lens unit becomes weak,
Since the exit pupil position of the main optical system approaches the image plane, it becomes necessary to increase the refractive power of the condenser lens. However, if the refractive power of the condenser lens is increased, it becomes difficult for the main optical system to correct various aberrations generated in the condenser lens, particularly, negative distortion and tilt of the image plane in the positive direction.
【００２４】また、条件式（２）は、第１群の屈折力と
相俟って主光学系の射出瞳位置を決定する第２群の屈折
力と、コンデンサーレンズの屈折力との比を規定する式
である。条件式（２）の上限を上回って第２群の屈折力
が強くなると、主光学系の射出瞳位置が像面に近付くた
め、コンデンサーレンズの屈折力を強くする必要が生じ
る。しかしながら、コンデンサーレンズの屈折力を強く
するとコンデンサーレンズでは発生する諸収差、特に負
の歪曲収差と像面の正方向への倒れを主光学系で補正す
ることが困難になる。逆に、条件式（２）の下限を下回
って第２群の屈折力が弱くなると、射出瞳は像面から遠
く離れるが、主光学系が大型化し、コンパクト化が達成
できなくなる。Conditional expression (2) defines the ratio between the refractive power of the second lens group, which determines the exit pupil position of the main optical system in combination with the refractive power of the first lens group, and the refractive power of the condenser lens. This is an expression to be specified. If the upper limit of conditional expression (2) is exceeded and the refractive power of the second lens unit increases, the exit pupil position of the main optical system approaches the image plane, so that it is necessary to increase the refractive power of the condenser lens. However, if the refractive power of the condenser lens is increased, it becomes difficult for the main optical system to correct various aberrations generated in the condenser lens, particularly, negative distortion and tilt of the image plane in the positive direction. Conversely, if the lower limit of conditional expression (2) is exceeded and the refracting power of the second lens unit is weakened, the exit pupil will be far away from the image plane, but the main optical system will be large and compact cannot be achieved.
【００２５】さらに、次の条件式（３）を満足するのが
望ましい。Furthermore, it is desirable that the following conditional expression (3) is satisfied.
【００２６】Ｙ’ ＜ ＬＢＷ ・・・（３） ここで、ＬＢＷ：広角端での主光学系最終面から像面ま
での距離、Ｙ’：最大像高、である。Y ′ <LBW (3) where LBW is the distance from the final surface of the main optical system at the wide angle end to the image plane, and Y ′ is the maximum image height.
【００２７】主光学系最終面から像面までの距離が条件
式（３）の範囲を外れて短くなると、主光学系最終面と
像面との間にローパスフィルターとの素子を配置するの
が困難になる。When the distance from the final surface of the main optical system to the image surface becomes shorter than the range of the conditional expression (3), an element such as a low-pass filter is arranged between the final surface of the main optical system and the image surface. It becomes difficult.
【００２８】さらに、次の条件式（４）を満足するのが
望ましい。Furthermore, it is desirable that the following conditional expression (4) is satisfied.
【００２９】 １．８ ＜ ｂｗ／ａｗ ＜ １２ ・・・（４） ここで、ｂｗ：コンデンサーレンズが配置された状態に
おける広角端での像面から射出瞳までの距離、ａｗ：コ
ンデンサーレンズが配置されていない状態における広角
端での像面から射出瞳までの距離、である。1.8 <bw / aw <12 (4) where, bw: the distance from the image plane at the wide-angle end to the exit pupil when the condenser lens is disposed, aw: the condenser lens is disposed This is the distance from the image plane at the wide-angle end to the exit pupil in a state where the zooming is not performed.
【００３０】条件式（４）はコンデンサーレンズによる
射出瞳位置の変化の度合いを規定している。条件式
（４）の下限を下回ると、コンデンサーレンズが配置さ
れていない状態でも射出瞳が像面から比較的離れている
ので、コンデンサーレンズを設けることの効果が少な
い。コンデンサーレンズが配置されていない状態でも射
出瞳が像面から比較的離れているということは、全長が
長いということでもあるので、撮影光学系の小型化が達
成されていない。逆に、条件式（４）の上限を上回る
と、コンデンサーレンズが射出瞳を像面から遠ざける作
用が強くなり過ぎる。コンデンサーレンズが射出瞳を像
面から遠ざける作用が強くなると、コンデンサーレンズ
で発生する諸収差、特に負の歪曲収差と像面の正方向へ
の倒れが大きくなり、これらを主光学系で補正するのが
困難になる。Conditional expression (4) defines the degree of change of the exit pupil position by the condenser lens. When the value goes below the lower limit of the conditional expression (4), the exit pupil is relatively far from the image plane even in a state where the condenser lens is not disposed, so that the effect of providing the condenser lens is small. Even when the condenser lens is not disposed, the fact that the exit pupil is relatively far from the image plane means that the overall length is long, and thus the miniaturization of the photographing optical system has not been achieved. Conversely, when the value exceeds the upper limit of conditional expression (4), the action of the condenser lens to move the exit pupil away from the image plane becomes too strong. If the action of the condenser lens to move the exit pupil away from the image plane becomes stronger, the various aberrations generated by the condenser lens, especially negative distortion and the tilt of the image plane in the positive direction, increase, and these are corrected by the main optical system. Becomes difficult.
【００３１】更に、次の条件式（５）及び／又は（６）
を満足するのが望ましい。Further, the following conditional expressions (5) and / or (6)
It is desirable to satisfy
【００３２】 ０．５ ＜ ｜φ１／φＴ｜ ＜ ５．０ ・・・（５） ０．５ ＜ ｜φ２／φＴ｜ ＜ ５．０ ・・・（６） ここで、φＴ：主光学系の望遠端での屈折力、である。0.5 <| φ1 / φT | <5.0 (5) 0.5 <| φ2 / φT | <5.0 (6) where φT is the main optical system Power at the telephoto end.
【００３３】条件式（５）（６）は、主光学系を小型化
するための条件を規定している。コンデンサーレンズを
設けない従来の撮影レンズ系では、各群の屈折力を弱
め、バックフォーカスを長くすることにより、射出瞳を
像面から遠ざけていた。このため、従来の撮影レンズ系
は大きなものになっていた。これに対し本発明では、コ
ンデンサーレンズを設けることによって射出瞳を像面か
ら遠ざけることができるので、主光学系各群の屈折力を
従来より強くすることができ、その結果、撮影レンズ系
を小型化できる。条件式（５）（６）の上限を上回り第
１群，第２群の屈折力が強くなると、撮影レンズ系を小
型化することはできるが、第１群，第２群で発生する諸
収差が大きくなり過ぎる。特に、第１群の屈折力が強く
なり過ぎると、負の歪曲収差が過大になると共に、球面
収差がオーバー側に倒れ、これらを他のレンズで補正す
ることが困難になる。また、第２群の屈折力が強くなり
過ぎると、負の歪曲収差が過大になると共に、球面収差
がアンダー側に倒れ、これらを他のレンズで補正するこ
とが困難になる。The conditional expressions (5) and (6) define conditions for reducing the size of the main optical system. In a conventional photographing lens system without a condenser lens, the exit pupil is kept away from the image plane by reducing the refractive power of each group and lengthening the back focus. For this reason, the conventional photographing lens system has become large. On the other hand, in the present invention, since the exit pupil can be kept away from the image plane by providing the condenser lens, the refractive power of each group of the main optical system can be made stronger than before, and as a result, the photographing lens system can be made compact. Can be When the upper limits of conditional expressions (5) and (6) are exceeded and the refractive powers of the first and second units become strong, the size of the photographing lens system can be reduced, but various aberrations generated in the first and second units Is too large. In particular, if the refractive power of the first lens unit becomes too strong, negative distortion becomes excessive and spherical aberration falls to the over side, making it difficult to correct these with other lenses. If the refractive power of the second lens unit becomes too strong, the negative distortion becomes excessive, and the spherical aberration falls to the under side, making it difficult to correct these with another lens.
【００３４】[0034]
【実施例】以下、本発明に係わる撮影レンズの実施例１
〜３を示す。但し、各実施例において、ｆは全系の焦点
距離、ＦNO.はＦナンバー、ri(i=1,2,3,...)は物体側か
ら数えてｉ番目の面の曲率半径、di(i=1,2,3,...)は物
体側から数えてｉ番目の軸上面間隔を示し、Ni(i=1,2,
3,...)，νi(i=1,2,3,...)は物体側から数えてｉ番目の
レンズのｄ線に対する屈折率，アッベ数を示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 of the taking lens according to the present invention will be described below.
3 are shown. However, in each embodiment, f is the focal length of the entire system, FNO. Is the F number, ri (i = 1, 2, 3,...) Is the radius of curvature of the i-th surface counted from the object side, di (i = 1,2,3, ...) indicates the i-th axial distance from the object side, and Ni (i = 1,2,
3,..., Νi (i = 1, 2, 3,...) Indicate the refractive index and the Abbe number of the i-th lens from the object side with respect to d-line.
【００３５】尚、各実施例中、曲率半径に＊印を付した
面は非球面で構成された面であることを示し、非球面の
面形状を表す以下の式で定義するものとする。It should be noted that, in each embodiment, a surface marked with an asterisk (*) indicates a surface composed of an aspheric surface, and is defined by the following expression representing the surface shape of the aspheric surface.
【００３６】[0036]
【数１】 (Equation 1)
【００３７】ここで、Ｘ：光軸と垂直な方向の高さ、
Ｙ：光軸方向の基準面からの変位量、Ｃ：近軸曲率、
ε：２次曲面パラメータ、Ａｉ：ｉ次の非球面係数、で
ある。X: height in the direction perpendicular to the optical axis,
Y: displacement amount from the reference plane in the optical axis direction, C: paraxial curvature,
ε: second-order surface parameter, Ai: i-th order aspherical coefficient.
【００３８】[0038]
【表１】 [Table 1]
【００３９】[0039]
【表２】 [Table 2]
【００４０】[0040]
【表３】 [Table 3]
【００４１】図４〜６は、それぞれ前記実施例１〜３の
収差を示している。なお、各図においては、上段から順
に、広角端，中間焦点距離状態，望遠端での収差を示し
ている。また、実線（ｄ）はｄ線に対する球面収差を表
し、破線（ＳＣ）は正弦条件を表す。更に破線（ＤＭ）
と実線（ＤＳ）はメリディオナル面とサジタル面での非
点収差をそれぞれ表している。4 to 6 show aberrations of the first to third embodiments, respectively. In each drawing, the aberrations at the wide angle end, the intermediate focal length state, and the telephoto end are shown in order from the top. The solid line (d) represents the spherical aberration with respect to the d-line, and the broken line (SC) represents the sine condition. Further broken line (DM)
And the solid line (DS) represent astigmatism on the meridional surface and the sagittal surface, respectively.
【００４２】また、表４は、実施例１〜実施例３におけ
る前記条件式(１)〜(６)に対応する値を示す。Table 4 shows values corresponding to the conditional expressions (1) to (6) in Examples 1 to 3.
【００４３】[0043]
【表４】 [Table 4]
【００４４】[0044]
【発明の効果】以上説明したように本発明によれば、射
出瞳が像面から遠く離れるので、固体撮像素子を用いた
カメラに適用した場合でも、固体撮像素子に撮影される
画像の中心部と周辺部とでの画像の明るさのバラツキを
抑えることができる。また、各群の屈折力を強くするこ
とができるので、撮影レンズ系全体を短くし、小型化す
ることができる。As described above, according to the present invention, since the exit pupil is far away from the image plane, even when the present invention is applied to a camera using a solid-state image sensor, the central part of an image captured by the solid-state image sensor is obtained. Variations in the brightness of the image between the image and the peripheral portion can be suppressed. In addition, since the refractive power of each group can be increased, the entire photographing lens system can be shortened and downsized.
【図１】本発明の第１実施形態のレンズ構成図。FIG. 1 is a lens configuration diagram of a first embodiment of the present invention.
【図２】本発明の第２実施形態のレンズ構成図。FIG. 2 is a lens configuration diagram according to a second embodiment of the present invention.
【図３】本発明の第３実施形態のレンズ構成図。FIG. 3 is a lens configuration diagram according to a third embodiment of the present invention.
【図４】本発明の実施例１の収差図。FIG. 4 is an aberration diagram of the first embodiment of the present invention.
【図５】本発明の実施例２の収差図。FIG. 5 is an aberration diagram of the second embodiment of the present invention.
【図６】本発明の実施例３の収差図。FIG. 6 is an aberration diagram of a third embodiment of the present invention.
Ｇｒ１・・・第１群 Ｇｒ２・・・第２群 ＬＣ・・・コンデンサーレンズ Gr1 First group Gr2 Second group LC Condenser lens
Claims (8)
された画像光を受光する複数の受光素子が配列された固
体撮像素子と、を備えた撮影レンズ装置であって、 前記撮影レンズ系は、物体側より順に、 全体として負の屈折力を有し、最も物体側に設けられた
負の屈折力を有するレンズを含む２枚のレンズで構成さ
れた第１群と、 正の屈折力を有する第２群と、 正の屈折力を有する1枚のレンズからなる第３群とから
構成されており、 前記撮影レンズ系はズームレンズ系であって、前記第３
群を固定させ、第１群と第２群を移動させることによっ
て変倍を行うことを特徴とする撮影レンズ装置。1. A photographing lens device comprising: a photographing lens system; and a solid-state imaging device in which a plurality of light receiving elements for receiving image light emitted from the photographing lens system are arranged. In order from the object side, a first group consisting of two lenses including a lens having a negative refractive power as a whole and having a negative refractive power provided closest to the object side, and a positive refractive power. A second lens unit having a positive refractive power and a third lens unit having a positive refractive power. The photographing lens system is a zoom lens system, and the third lens unit is a zoom lens system.
A photographing lens apparatus wherein the zooming is performed by fixing a group and moving a first group and a second group.
撮影レンズ装置： -6.0<φ1/φ3<-1.2 ここで、 φ1：第１群の屈折力、 φ3：第３群の屈折力、 である。2. The photographing lens device according to claim 1, which satisfies the following conditional expression: -6.0 <φ1 / φ3 <-1.2, where φ1: the refractive power of the first lens unit, and φ3: the refractive power of the third lens unit. ,.
撮影レンズ装置： 1.2<φ2/φ3<6.0 ここで、 φ2：第２群の屈折力、 φ3：第３群の屈折力、 である。3. The photographing lens device according to claim 1, which satisfies the following conditional expression: 1.2 <φ2 / φ3 <6.0, where φ2: refractive power of the second group, φ3: refractive power of the third group, and is there.
撮影レンズ装置： 0.5<|φ1/φT|<5.0 ここで、 φT：第１，２群の望遠端での屈折力、 である。4. The photographing lens device according to claim 1, wherein the following conditional expression is satisfied: 0.5 <| φ1 / φT | <5.0, where φT is the refractive power of the first and second lens units at the telephoto end. .
撮影レンズ装置： 0.5<|φ2/φT|<5.0 ここで、 φT：第１，２群の望遠端での屈折力、 である。5. The photographing lens device according to claim 1, which satisfies the following conditional expression: 0.5 <| φ2 / φT | <5.0, where φT is a refractive power of the first and second units at the telephoto end. .
て入射面側に集光性のマイクロレンズが設けられている
ことを特徴とする請求項１ないし５のいずれかに記載の
撮影レンズ装置。6. The photographic lens according to claim 1, wherein a light-collecting microlens is provided on an incident surface side corresponding to each light receiving element of said solid-state imaging device. apparatus.
ことを特徴とする請求項１ないし６のいずれかに記載の
撮影レンズ装置。7. The photographing lens device according to claim 1, further comprising a low-pass filter on the optical path.
の撮影レンズ装置を備えたカメラ。8. A camera provided with the photographing lens device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000349079A JP3594236B2 (en) | 2000-11-16 | 2000-11-16 | Shooting lens system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000349079A JP3594236B2 (en) | 2000-11-16 | 2000-11-16 | Shooting lens system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8071738A Division JPH09258103A (en) | 1996-03-27 | 1996-03-27 | Photographic lens system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001194589A true JP2001194589A (en) | 2001-07-19 |
| JP3594236B2 JP3594236B2 (en) | 2004-11-24 |
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ID=18822546
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000349079A Expired - Fee Related JP3594236B2 (en) | 2000-11-16 | 2000-11-16 | Shooting lens system |
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| Country | Link |
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| JP (1) | JP3594236B2 (en) |
Cited By (6)
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|---|---|---|---|---|
| JP2001033702A (en) * | 1999-07-26 | 2001-02-09 | Canon Inc | Zoom lens |
| JP2004170664A (en) * | 2002-11-20 | 2004-06-17 | Olympus Corp | Imaging lens system, and imaging device using the same |
| JP2006003539A (en) * | 2004-06-16 | 2006-01-05 | Canon Inc | Zoom lens and imaging apparatus having same |
| JP2006139197A (en) * | 2004-11-15 | 2006-06-01 | Nagano Kogaku Kenkyusho:Kk | Zoom lens system |
| US7251080B2 (en) | 2004-07-26 | 2007-07-31 | Pentax Corporation | Zoom lens system |
| CN102981247A (en) * | 2011-09-02 | 2013-03-20 | 大立光电股份有限公司 | Image lens group |
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| JP4532627B2 (en) * | 1999-07-26 | 2010-08-25 | キヤノン株式会社 | Zoom lens |
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| JP2006139197A (en) * | 2004-11-15 | 2006-06-01 | Nagano Kogaku Kenkyusho:Kk | Zoom lens system |
| CN102981247A (en) * | 2011-09-02 | 2013-03-20 | 大立光电股份有限公司 | Image lens group |
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|---|---|
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