JP2005181852A - Photographing lens system and photographing apparatus having the system - Google Patents

Photographing lens system and photographing apparatus having the system Download PDF

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JP2005181852A
JP2005181852A JP2003425108A JP2003425108A JP2005181852A JP 2005181852 A JP2005181852 A JP 2005181852A JP 2003425108 A JP2003425108 A JP 2003425108A JP 2003425108 A JP2003425108 A JP 2003425108A JP 2005181852 A JP2005181852 A JP 2005181852A
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lens
lens group
positive
refractive power
object side
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Yasushi Ogata
康司 小方
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Olympus Corp
オリンパス株式会社
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/04Reversed telephoto objectives

Abstract

PROBLEM TO BE SOLVED: To provide a photographing lens system of a negative precedence type in which entry of dust into a lens barrel during focusing is reduced and a change in aberration during focusing is also reduced and to provide a photographing apparatus having the photographing lens system.
SOLUTION: The photographing lens system includes, in order from the object side: a first lens group G1 having negative refracting power; a second lens group G2 having positive refracting power; a brightness diaphragm S; and a third lens group G3 having positive refracting power. The photographing lens system focuses from an infinite long distance to a finite long distance in such a way that with the first lens group G1 fixed, the second lens group G2 is positioned on the image side when focused in the finite long distance with respect to the position when focused in the infinite long distance whereas the third lens group G3 is positioned on the object side when focused in the finite long distance with respect to the position when focused in the infinite long distance.
COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、撮影レンズ系及びそれを備えた撮影装置に関し、特に、レンズ交換式カメラに適した撮影レンズとそれを備えた撮影装置に関するものである。 The present invention relates to a photographing apparatus having a photographing lens system and it particularly relates to imaging apparatus having the imaging lens and it suitable for interchangeable lens camera.

従来より、負レンズ群が先行する群配置が負、正、正タイプの撮影レンズ系が提案されている。 Conventionally, the group arranged to the negative lens group is preceded negative, positive, positive type photographic lens systems have been proposed.

しかしながら、負レンズ群が先行する負、正、正タイプの撮影レンズ系において、フォーカシングのために前群を移動させるタイプのものは、フォーカシングに伴うレンズ鏡筒内へのほこりの進入の対策が必要となり、また、電動でフォーカシングを行う場合、レンズの径が大きくなりがちなレンズ群を移動させるため、消費電力がかかるという課題がある。 However, negative negative lens group is preceded, positive, the positive type photographic lens system, of the type that moves the front group for focusing, measures must be taken ingress of dust to the lens barrel inside during focusing next, also, if focusing is performed by an electric, for moving the diameter tends to increase lens group of the lens, there is a problem that power consumption is consuming.

また、第1レンズ群を固定させるタイプの撮影レンズ系では、フォーカシングに伴う収差変動が起こりやすい。 Further, the type of the photographing lens system to fix the first lens group, the aberration fluctuation during focusing is likely to occur.

本発明は従来技術のこのような問題点に鑑みてなされたものであり、その目的は、フォーカシングに伴う鏡筒内へのほこりの進入を低減し、かつ、フォーカシングに伴う収差変動を低減した負先行タイプの撮影レンズ系とそれを備えた撮影装置を提供することである。 The present invention has been made in view of such problems of the prior art, negative its purpose is to reduce the ingress of dust into the lens barrel during focusing and having reduced aberration fluctuation during focusing it is to provide a prior type of the photographing lens system and the imaging device having the same.

上記目的を達成する本発明の撮影レンズ系は、物体側から順に、負の屈折力を有する第1レンズ群と、正の屈折力を有する第2レンズ群と、明るさ絞りと、正の屈折力を有する第3レンズ群とを有し、 Taking lens system of the present invention to achieve the above object, in order from the object side, a first lens group having negative refractive power, a second lens group having positive refractive power, and an aperture stop, a positive refractive and a third lens group having a force,
前記第1レンズ群を固定した状態で、前記第2レンズ群が無限遠距離の合焦時の位置に対して有限遠距離の合焦時の位置が像側に位置し、前記第3レンズ群が無限遠距離の合焦時の位置に対して有限遠距離の合焦時の位置が物体側に位置することで、無限遠距離から有限遠距離へのフォーカシングを行うことを特徴とするものである。 While fixing the first lens group, the position of the in-focus state of the finite far the second lens group relative to the position of the in-focus state of the infinite distance is positioned at the image side, the third lens group There is the position of the in-focus state of the finite far relative to the position of the in-focus state of infinite distance is located on the object side, characterized in that for focusing to a finite far from infinite distance is there.

以下、本発明において上記構成をとる理由と作用を説明する。 Hereinafter, the operation and for, the above-described structure in the present invention.

撮影レンズ系を、物体側から順に、負レンズ群、正レンズ群、正レンズ群の構成とすることで、全体をレトロフォーカスタイプに構成し、広画角、かつ、バックフォーカスを長くしやすい構成としている。 An imaging lens system, in order from the object side, a negative lens group, a positive lens group, With the positive lens group configuration, constitute a whole retrofocus type, wide field of view, and construction and easy long back focus It is set to.

そして、絞りを、正屈折力の第2レンズ群と正屈折力の第3レンズ群との間に配置することで、レトロフォーカスタイプのレンズ系で発生しやすい負の歪曲収差を低減させている。 Then, the aperture, by placing between the third lens group and the second lens unit having a positive refractive power having a positive refractive power, reduce the negative distortion that tends to occur in the retrofocus lens system .

また、無限遠距離から有限遠距離へのフォーカシングに際しては、第1レンズ群を固定とすることで、フォーカシングに伴うほこりの鏡筒内への進入を低減できる。 In focusing from infinity to a finite far distance, by fixing the first lens group can be reduced from entering the dust lens barrel during focusing. また、フォーカシングを電動にて行う場合、比較的レンズの径が大きくなりやすい第1レンズ群を固定としているため、消費電力を低減できる。 When performing focusing in electric, relatively lens diameter is fixing the first lens group tends to be large, the power consumption can be reduced.

また、明るさ絞りを挟んで配された正の第2レンズ群と正の第3レンズ群が、フォーカシングに際して、第2レンズ群を無限遠距離の合焦時の位置に対して有限遠距離の合焦時の位置が像側に位置し、第3レンズ群が無限遠距離の合焦時の位置に対して有限遠距離の合焦時の位置が物体側に位置することで、フォーカシングに伴い発生する収差の発生を相殺しやすくできる。 Further, disposed across the aperture stop second lens group and the positive third lens group of positive is, upon focusing, the finite far the second lens group relative to the position upon focusing infinite distance of focus position when the focus is positioned on the image side, in the position of the in-focus state of the finite far third lens group relative to the position of the in-focus state of infinite distance is located on the object side, with the focusing It can easily offset the occurrence of aberrations that occur.

この場合に、無限遠距離から有限遠距離へのフォーカシングの際に、第2レンズ群は像側のみに移動し、第3レンズ群は物体側のみに移動するようにすることができる。 In this case, when the infinite distance focusing to a finite long distance, the second lens group moves only toward the image side, the third lens group can be made to move only toward the object side.

また、第1レンズ群と第3レンズ群は非球面を有し、第1レンズ群における非球面は、少なくとも第1レンズ群における最も像面側の屈折面に配することが望ましい。 Further, a first lens group and the third lens group has an aspheric surface, the aspherical surface in the first lens group, it is preferable to dispose the refractive surface on the most image side of at least the first lens group.

このように、第1レンズ群と第3レンズ群の各々に非球面レンズを配することで、軸外収差の補正に有利となる。 Thus, by disposing the aspherical lens on each of the first lens group and the third lens group is advantageous for correction of off-axis aberrations. 特に、第1レンズ群の最も像面側の屈折面を非球面とすると、収差を補正しながら小型化のために有利となる。 In particular, when the refractive surface on the most image side of the first lens group aspherical, which is advantageous for compactness while correcting the aberration.

また、第3レンズ群の射出面から像面までの空気換算長をf B 、撮影レンズ系のイメージサークル(直径)をIMとしたとき、以下の条件を満足することが望ましい。 The third lens group f B equivalent air length from the image plane from the exit surface, when the image circle of the imaging lens system (diameter) was IM, it is preferable that the following condition is satisfied.

B /IM>1.5 ・・・(1) f B /IM>1.5 ··· (1)
この条件式(1)は、イメージサークルに対するバックフォーカスを規定する条件式である。 The conditional expression (1) is a conditional expression that defines the back focus to the image circle. この条件式の下限値の1.5を越えると、バックフォーカスがイメージサークルに対して小さくなりすぎ、クイックリターンミラー、光路分割プリズム、フィルター等の部材を配するためのスペースが小さくなり、好ましくない。 Exceeding 1.5 lower limit of the conditional expression, too small relative to the back focus image circle, the smaller the space for disposing the quick return mirror, the optical path splitting prism, a member such as a filter, undesired .

また、第2レンズ群の焦点距離をf 2 、撮影レンズの全系の焦点距離をfとしたとき、以下の条件式を満足することが望ましい。 Further, the focal length of the second lens group f 2, when a focal length of the entire system of the imaging lens is f, it is desirable to satisfy the following condition.

2 /f>5.0 ・・・(2) f 2 /f>5.0 ··· (2)
この条件式(2)は、第2レンズ群の焦点距離を規定する条件式である。 The conditional expression (2) is a conditional expression for defining the focal length of the second lens group. この条件式の下限の5.0を越えると、第2レンズ群の焦点距離が小さくなりすぎ、収差が発生しやすくなる。 Exceeding 5.0 lower limit of the conditional expression, too focal length of the second lens group is small, aberration is likely to occur.

また、第1レンズ群の物体側から数えて2枚目に配されるレンズが正レンズであるように構成することができる。 Further, it is possible to lenses arranged in the second sheet as counted from the object side of the first lens group is configured such that a positive lens.

また、第1レンズ群の物体側から数えて2枚目に配されるレンズが物体側に凸面を向けた正メニスカスレンズであるように構成することができる。 Further, it is possible to lenses arranged in the second sheet as counted from the object side of the first lens group is configured to be a positive meniscus lens having a convex surface directed toward the object side.

また、第1レンズ群の最も像面側に配されるレンズが正レンズであるように構成することができる。 Further, it is possible to lens most disposed to the image plane side of the first lens group is configured such that a positive lens.

また、第1レンズ群の最も像面側に配されるレンズが物体側に凸面を向けた正メニスカスレンズであるように構成することができる。 Further, it is possible to lens most disposed to the image plane side of the first lens group is configured to be a positive meniscus lens having a convex surface directed toward the object side.

また、明るさ絞りよりも像側に配される第3レンズ群が、物体側から順に、負の屈折力を有する3−1サブユニット、正の屈折力を有する3−2サブユニット、負の屈折力のレンズと正の屈折力のレンズを有する3−3サブユニットを有するように構成することができる。 The third lens group disposed on the image side of the aperture stop, in order from the object side, 3-1 subunits having a negative refractive power, 3-2 subunits having a positive refractive power, negative it can be configured to have a 3-3 subunits with lenses of the lens and the positive refractive power of the refractive power.

また、明るさ絞りよりも像側に配される第3レンズ群が、物体側から順に、負の屈折力を有する3−1サブユニット、正の屈折力を有する3−2サブユニットを有するように構成することもできる。 The third lens group disposed on the image side of the aperture stop, in order from the object side, 3-1 subunits having a negative refractive power, to have a 3-2 subunit having a positive refractive power It can also be configured to.

また、第1レンズ群乃至第3レンズ群を保持する保持枠と、その保持枠を撮影装置本体部に着脱可能とするマウント部とを備えたものとすることが望ましい。 Further, it is preferable to one having a holding frame for holding the first lens group to the third lens group, and a mounting portion which is detachably mountable to the holding frame to the imaging apparatus body.

本発明の撮影レンズ系は、バックフォーカスを長く構成しやすい。 Taking lens system of the present invention is to easily lengthened constituting the back focus. そのため、例えばレンズ交換式の一眼レフレックスカメラの交換レンズとして使用できる。 Therefore, it can be used as a single lens interchangeable lens reflex camera, for example, an interchangeable lens.

したがって、本発明により、以上のような撮影レンズ系と、その撮影レンズ系の像面側に配された撮像素子とを備えた撮影装置を構成することができる。 Therefore, it is possible to configure the present invention, a taking lens system as described above, the imaging apparatus comprising an image pickup device disposed on the image plane side of the imaging lens system.

本発明によると、負、正、正タイプの撮影レンズ系において、第1レンズ群を固定した状態で、第2レンズ群が無限遠距離の合焦時の位置に対して有限遠距離の合焦時の位置が像側に位置し、第3レンズ群が無限遠距離の合焦時の位置に対して有限遠距離の合焦時の位置が物体側に位置することで、無限遠距離から有限遠距離へのフォーカシングを行うので、全体をレトロフォーカスタイプであり、広画角、かつ、バックフォーカスを長くしやすい。 According to the present invention, negative, positive, the positive type photographic lens system, while fixing the first lens group, if the finite far focus the second lens unit relative to the position of the in-focus state of the infinite distance located within the image-side position of the time, the third lens unit is located upon focusing finite far is located on the object side with respect to the position of the in-focus state of the infinite distance, finite from infinity since the focusing on a long distance, is a retro-focus type the whole, wide angle of view, and, easy to lengthen the back focus. また、絞りを、正屈折力の第2レンズ群と正屈折力の第3レンズ群との間に配置することで、負の歪曲収差を低減させている。 Also the aperture, by placing between the second lens group and the negative refractive power, a third lens unit of positive refractive power, reduce the negative distortion. また、フォーカシングに際して第1レンズ群を固定とすることで、フォーカシングに伴うほこりの鏡筒内への進入を低減でき、また、フォーカシングを電動にて行う場合、比較的レンズの径が大きくなりやすい第1レンズ群を固定としているため、消費電力を低減できる。 In addition, by fixing the first lens group during focusing, can be reduced from entering the dust of the lens barrel during focusing, also, the likely case, relatively diameter of the lens is increased to perform focusing at the electric due to the a first lens group fixed, power consumption can be reduced.

以下に、本発明の撮影レンズ系の実施例1〜3について、図面を参照して説明する。 Hereinafter, Examples 1 to 3 of the imaging lens system of the present invention will be described with reference to the drawings. 実施例1〜3の無限遠物点合焦時(a)及び至近物点合焦時(b)の光軸に沿うレンズ断面図をそれぞれ図1〜図3に示す。 It shows a lens sectional view along an optical axis at an infinite object point focusing of Example 1 to 3 (a) and at near object point focusing (b) in FIGS. 1 to FIG. 3. 各図中、G1は第1レンズ群、G2は第2レンズ群、Sは明るさ絞り、G3は第3レンズ群、Fはローパスフィルターの平行平板、Iは像面であり、平行平板Fの表面に赤外線カットコートが施されている。 In each figure, G1 is the first lens group, G2 is the second lens group, S is an aperture stop, G3 is the third lens group, F is a parallel plate, I low pass filter is an image plane, the parallel plate F infrared cut coat is applied to the surface. また、実施例1〜3の無限遠物点合焦時(a)及び至近物点合焦時(b)の球面収差、像面湾曲、歪曲収差、倍率色収差の収差図をそれぞれ図4〜図6に示す。 Further, each of FIGS. 4 to spherical aberration, field curvature, distortion aberration, the aberration diagram of lateral chromatic aberration at an infinite object point focusing of Example 1 to 3 (a) and at near object point focusing (b) It is shown in 6. なお、これら収差図中において、“FIY”は像高を表す。 Note that, in these graphs, "FIY" represents the image height.

実施例1の撮影レンズ系は、図1に示すように、物体側から順に、負屈折力の第1レンズ群G1と、正屈折力の第2レンズ群G2と、明るさ絞りSと、正屈折力の第3レンズ群G3とで構成されており、無限遠距離から有限遠距離へのフォーカシングを行うとき、第1レンズ群G1は固定で、第2レンズ群G2を像側へ、明るさ絞りSも像側へ、また、第3レンズ群G3は物体側へ移動させる。 Of the imaging lens system according to the first embodiment, as shown in FIG. 1, in order from the object side, a first lens group G1 having negative refractive power, a second lens unit having a positive refractive power G2, an aperture stop S, a positive and a third lens group G3 of power, when performing focusing from infinity to a finite long distance, the first lens group G1 is fixed, the second lens group G2 to the image side, the brightness stop S also to the image side, the third lens group G3 moves toward the object side.

各レンズ群の構成は、第1レンズ群G1は、物体側に凸面を向けた負メニスカスレンズ、物体側に凸面を向けた正メニスカスレンズ、物体側に凸面を向けた負メニスカスレンズの3枚で構成され、第2レンズ群G2は、両凸正レンズと両凹負レンズの接合レンズ、両凸正レンズの3枚で構成されている。 Configuration of each lens group, the first lens group G1 includes a negative meniscus lens having a convex surface directed toward the object side, a positive meniscus lens having a convex surface directed toward the object side, with three negative meniscus lens having a convex surface directed toward the object side is configured, the second lens unit G2, a double-convex positive lens and a cemented lens of a biconcave negative lens, and a three biconvex positive lens. 第3レンズ群G3は、負屈折力の3−1サブユニットS3−1、正屈折力の3−2サブユニットS3−2、負屈折力のレンズと正屈折力のレンズを有する3−3サブユニットS3−3からなり、3−1サブユニットS3−1は両凹負レンズと両凸正レンズの接合レンズの2枚からなり、3−2サブユニットS3−2は両凸正レンズ1枚からなり、3−3サブユニットS3−3は像側に凸面を向けた負メニスカスレンズと像側に凸面を向けた正メニスカスレンズの接合レンズの2枚からなる。 The third lens group G3, 3-3 sub having a negative refractive power of 3-1 subunits S3-1, 3-2 subunits S3-2 positive refractive power, the negative refractive power lens and the positive power of the lens It consists unit S3-3, 3-1 subunits S3-1 consists of two cemented lens of a biconcave negative lens and a biconvex positive lens, 3-2 subunits S3-2 from one double-convex positive lens becomes, 3-3 subunits S3-3 is composed of two cemented lenses of a positive meniscus lens having a convex surface directed toward the negative meniscus lens and the image side with the convex surface facing the image side.

非球面は、第1レンズ群G1の像側の負メニスカスレンズの像側の面と、第3レンズ群G3の3−2サブユニットS3−2の両凸正レンズの像側の面の2面に用いられいる。 An aspheric surface is the image side surface of the negative meniscus lens on the image side of the first lens group G1, 2 image-side surface of the biconvex positive lens of 3-2 subunits S3-2 of the third lens group G3 It is used to.

この実施例においては、物体距離無限遠から至近距離の150mmまで合焦可能である。 In this embodiment, it is possible focusing to 150mm of infinite object distance close range.

実施例2の撮影レンズ系は、図2に示すように、物体側から順に、負屈折力の第1レンズ群G1と、正屈折力の第2レンズ群G2と、明るさ絞りSと、正屈折力の第3レンズ群G3とで構成されており、無限遠距離から有限遠距離へのフォーカシングを行うとき、第1レンズ群G1は固定で、第2レンズ群G2を像側へ、明るさ絞りSも像側へ、また、第3レンズ群G3は物体側へ移動させる。 Of the imaging lens system in the second embodiment, as shown in FIG. 2, in order from the object side, a first lens group G1 having negative refractive power, a second lens unit having a positive refractive power G2, an aperture stop S, a positive and a third lens group G3 of power, when performing focusing from infinity to a finite long distance, the first lens group G1 is fixed, the second lens group G2 to the image side, the brightness stop S also to the image side, the third lens group G3 moves toward the object side.

各レンズ群の構成は、第1レンズ群G1は、物体側に凸面を向けた2枚の負メニスカスレンズ、物体側に凸面を向けた正メニスカスレンズの3枚で構成され、第2レンズ群G2は、物体側に凸面を向けた負メニスカスレンズと物体側に凸面を向けた正メニスカスレンズの接合レンズ、像側に凸面を向けた正メニスカスレンズと像側に凸面を向けた負メニスカスレンズの接合レンズ、両凸正レンズの5枚で構成されている。 Configuration of each lens group, the first lens group G1 includes two negative meniscus lens having a convex surface directed toward the object side, is constituted by three positive meniscus lens having a convex surface directed toward the object side, the second lens group G2 the joining of the negative meniscus lens cemented lens, a positive meniscus lens with a convex surface on the image side with a convex surface facing the image side of the positive meniscus lens having a convex surface directed toward the negative meniscus lens and the object side with a convex surface on the object side lens, and a five biconvex positive lens. 第3レンズ群G3は、負屈折力の3−1サブユニットS3−1、正屈折力の3−2サブユニットS3−2からなり、3−1サブユニットS3−1は両凹負レンズと両凸正レンズの接合レンズの2枚からなり、3−2サブユニットS3−2は両凸正レンズ、像側に凸面を向けた正メニスカスレンズの2枚からなる。 The third lens group G3, 3-1 subunits of negative refractive power S3-1, made 3-2 subunits S3-2 having a positive refractive power, 3-1 subunits S3-1 is a biconcave negative lens both It consists of two cemented lenses of convex positive lens, 3-2 subunits S3-2 is composed of two positive meniscus lens having a convex surface directed toward the double-convex positive lens, the image side.

非球面は、第1レンズ群G1の像側の負メニスカスレンズの像側の面と、第3レンズ群G3の3−2サブユニットS3−2の両凸正レンズの両面の3面に用いられいる。 An aspheric surface is the image side surface of the negative meniscus lens on the image side of the first lens group G1, used in three sides of both surfaces of the biconvex positive lens of 3-2 subunits S3-2 of the third lens group G3 there.

この実施例においては、物体距離無限遠から至近距離の150mmまで合焦可能である。 In this embodiment, it is possible focusing to 150mm of infinite object distance close range.

実施例3の撮影レンズ系は、図3に示すように、物体側から順に、負屈折力の第1レンズ群G1と、正屈折力の第2レンズ群G2と、明るさ絞りSと、正屈折力の第3レンズ群G3とで構成されており、無限遠距離から有限遠距離へのフォーカシングを行うとき、第1レンズ群G1は固定で、第2レンズ群G2を像側へ、明るさ絞りSは物体側へ、また、第3レンズ群G3は物体側へ移動させる。 Taking lens system of Example 3, as shown in FIG. 3, in order from the object side, a first lens group G1 having negative refractive power, a second lens unit having a positive refractive power G2, an aperture stop S, a positive and a third lens group G3 of power, when performing focusing from infinity to a finite long distance, the first lens group G1 is fixed, the second lens group G2 to the image side, the brightness stop S toward the object side, the third lens group G3 moves toward the object side.

各レンズ群の構成は、第1レンズ群G1は、物体側に凸面を向けた3枚の負メニスカスレンズで構成され、第2レンズ群G2は、物体側に凸面を向けた負メニスカスレンズと両凸正レンズの接合レンズ、像側に凸面を向けた正メニスカスレンズと像側に凸面を向けた負メニスカスレンズの接合レンズの4枚で構成されている。 Configuration of each lens group, the first lens group G1 is composed of three negative meniscus lens having a convex surface directed toward the object side, the second lens unit G2, both a negative meniscus lens having a convex surface directed toward the object side a cemented lens of a convex positive lens, and a four cemented lens of a negative meniscus lens having a convex surface directed toward the positive meniscus lens and the image side with the convex surface facing the image side. 第3レンズ群G3は、負屈折力の3−1サブユニットS3−1、正屈折力の3−2サブユニットS3−2からなり、3−1サブユニットS3−1は両凹負レンズと両凸正レンズの接合レンズの2枚からなり、3−2サブユニットS3−2は両凸正レンズ、像側に凸面を向けた正メニスカスレンズの2枚からなる。 The third lens group G3, 3-1 subunits of negative refractive power S3-1, made 3-2 subunits S3-2 having a positive refractive power, 3-1 subunits S3-1 is a biconcave negative lens both It consists of two cemented lenses of convex positive lens, 3-2 subunits S3-2 is composed of two positive meniscus lens having a convex surface directed toward the double-convex positive lens, the image side.

非球面は、第1レンズ群G1の最も像側の負メニスカスレンズの像側の面と、第3レンズ群G3の3−2サブユニットS3−2の両凸正レンズの像側の面の2面に用いられいる。 Aspherical surface, the second most image side surface of the negative meniscus lens on the image side, the image side surface of the biconvex positive lens of 3-2 subunits S3-2 of the third lens group G3 in the first lens group G1 It is used in the surface.

この実施例においては、物体距離無限遠から至近距離の150mmまで合焦可能である。 In this embodiment, it is possible focusing to 150mm of infinite object distance close range.

以下に、上記実施例1〜3の数値データを示すが、記号は上記の外、fは全系焦点距離、ωは半画角、f Bはバックフォーカス、r 1 、r 2 …は各レンズ面の曲率半径、d 1 、d 2 …は各レンズ面間の間隔、n d1 、n d2 …は各レンズのd線の屈折率、ν d1 、ν d2 …は各レンズのアッベ数である。 Are shown below, but the numerical data of Examples 1-3, from symbols of the, f is the focal length, omega denotes a half angle, f B designates the back focal distance, r 1, r 2 ... Each lens radius of curvature, d 1, d 2 ... the spacing between the lens surfaces, n d1, n d2 ... d-line refractive index of each lens, ν d1, ν d2 ... is the Abbe number of each lens. また、d 0は物体距離である。 Furthermore, d 0 is the object distance. なお、非球面形状は、xを光の進行方向を正とした光軸とし、yを光軸と直交する方向にとると、下記の式にて表される。 The non-spherical shape, an optical axis provided that the direction of travel of light is positive and x, a direction orthogonal to the optical axis y, is expressed by the following equation.

x=(y 2 /r)/[1+{1−(K+1)(y/r) 21/2 x = (y 2 / r) / [1+ {1- (K + 1) (y / r) 2} 1/2]
+A 44 +A 66 +A 88 +A 1010 + A 4 y 4 + A 6 y 6 + A 8 y 8 + A 10 y 10
ただし、rは近軸曲率半径、Kは円錐係数、A 4 、A 6 、A 8 、A 10はそれぞれ4次、6次、8次、10次の非球面係数である。 Where, r is the paraxial radius of curvature, K is a conical coefficient, A 4, A 6, A 8, A 10 are the fourth, sixth, eighth and tenth aspheric coefficients.


実施例1 Example 1
f =12.55 f = 12.55
ω =40.77 ° ω = 40.77 °
B =35.277 f B = 35.277
IM =21.64 IM = 21.64
2 =122.75 f 2 = 122.75
B /IM=1.63 f B /IM=1.63
2 /f =9.78 f 2 / f = 9.78
1 = 34.7869 d 1 = 2.0000 n d1 =1.77250 ν d1 =49.60 r 1 = 34.7869 d 1 = 2.0000 n d1 = 1.77250 ν d1 = 49.60
2 = 16.2237 d 2 = 7.1717 r 2 = 16.2237 d 2 = 7.1717
3 = 41.7532 d 3 = 3.5469 n d2 =1.80518 ν d2 =25.42 r 3 = 41.7532 d 3 = 3.5469 n d2 = 1.80518 ν d2 = 25.42
4 = 103.0721 d 4 = 0.1500 r 4 = 103.0721 d 4 = 0.1500
5 = 25.9065 d 5 = 2.0000 n d3 =1.48749 ν d3 =70.23 r 5 = 25.9065 d 5 = 2.0000 n d3 = 1.48749 ν d3 = 70.23
6 = 10.6696(非球面) d 6 = (可変) r 6 = 10.6696 (aspherical) d 6 = (Variable)
7 = 95.4643 d 7 = 4.5445 n d4 =1.57501 ν d4 =41.50 r 7 = 95.4643 d 7 = 4.5445 n d4 = 1.57501 ν d4 = 41.50
8 = -10.1692 d 8 = 2.0000 n d5 =1.77250 ν d5 =49.60 r 8 = -10.1692 d 8 = 2.0000 n d5 = 1.77250 ν d5 = 49.60
9 = 193.6844 d 9 = 0.1000 r 9 = 193.6844 d 9 = 0.1000
10 = 42.5027 d 10 = 2.6873 n d6 =1.80518 ν d6 =25.42 r 10 = 42.5027 d 10 = 2.6873 n d6 = 1.80518 ν d6 = 25.42
11 = -128.1902 d 11 = (可変) r 11 = -128.1902 d 11 = (variable)
12 = ∞(絞り) d 12 = (可変) r 12 = ∞ (aperture) d 12 = (variable)
13 = -35.0299 d 13 = 2.0000 n d7 =1.80518 ν d7 =25.42 r 13 = -35.0299 d 13 = 2.0000 n d7 = 1.80518 ν d7 = 25.42
14 = 27.1767 d 14 = 4.7099 n d8 =1.58913 ν d8 =61.14 r 14 = 27.1767 d 14 = 4.7099 n d8 = 1.58913 ν d8 = 61.14
15 = -38.0739 d 15 = 0.1500 r 15 = -38.0739 d 15 = 0.1500
16 = 47.8802 d 16 = 4.1653 n d9 =1.58913 ν d9 =61.14 r 16 = 47.8802 d 16 = 4.1653 n d9 = 1.58913 ν d9 = 61.14
17 = -36.6897(非球面) d 17 = 0.1500 r 17 = -36.6897 (non-spherical) d 17 = 0.1500
18 = -68.0376 d 18 = 2.0000 n d10 =1.80518 ν d10 =25.42 r 18 = -68.0376 d 18 = 2.0000 n d10 = 1.80518 ν d10 = 25.42
19 = -172.1490 d 19 = 4.2606 n d11 =1.77250 ν d11 =49.60 r 19 = -172.1490 d 19 = 4.2606 n d11 = 1.77250 ν d11 = 49.60
20 = -24.2548 d 20 = (可変) r 20 = -24.2548 d 20 = (variable)
21 = ∞ d 21 = 4.2000 n d12 =1.51633 ν d12 =64.14 r 21 = ∞ d 21 = 4.2000 n d12 = 1.51633 ν d12 = 64.14
22 = ∞ d 22 = 2.5069 r 22 = ∞ d 22 = 2.5069
23 = ∞(像面) r 23 = ∞ (image plane)
非球面係数 第6面 K = -0.4515 Aspherical coefficients sixth surface K = -0.4515
4 = -4.6778 ×10 -5 A 4 = -4.6778 × 10 -5
6 = -3.4610 ×10 -7 A 6 = -3.4610 × 10 -7
8 = -2.6741 ×10 -9 A 8 = -2.6741 × 10 -9
10 = 0.0000 A 10 = 0.0000
第17面 K = 0 Seventeenth surface K = 0
4 = 2.9864 ×10 -5 A 4 = 2.9864 × 10 -5
6 = 8.1338 ×10 -9 A 6 = 8.1338 × 10 -9
8 = 1.9789 ×10 -12 A 8 = 1.9789 × 10 -12
10 = 0.0000 A 10 = 0.0000
可変間隔 d 0 ∞ 150.00000 Variable spacing d 0 ∞ 150.00000
6 17.05685 17.28525 d 6 17.05685 17.28525
11 4.52680 4.70882 d 11 4.52680 4.70882
12 6.11814 4.69773 d 12 6.11814 4.69773
20 30.00000 31.00999 。 d 20 30.00000 31.00999.


実施例2 Example 2
f =12.20 f = 12.20
ω =41.56 ° ω = 41.56 °
B =35.274 f B = 35.274
IM =21.64 IM = 21.64
2 =249.68 f 2 = 249.68
B /IM=1.63 f B /IM=1.63
2 /f =20.46 f 2 / f = 20.46
1 = 25.7587 d 1 = 2.0000 n d1 =1.72916 ν d1 =54.68 r 1 = 25.7587 d 1 = 2.0000 n d1 = 1.72916 ν d1 = 54.68
2 = 14.5160 d 2 = 8.0114 r 2 = 14.5160 d 2 = 8.0114
3 = 21.4779 d 3 = 2.0509 n d2 =1.51633 ν d2 =64.14 r 3 = 21.4779 d 3 = 2.0509 n d2 = 1.51633 ν d2 = 64.14
4 = 10.7046(非球面) d 4 = 5.9987 r 4 = 10.7046 (non-spherical) d 4 = 5.9987
5 = 34.2468 d 5 = 4.1207 n d3 =1.69895 ν d3 =30.13 r 5 = 34.2468 d 5 = 4.1207 n d3 = 1.69895 ν d3 = 30.13
6 = 60.1762 d 6 = (可変) r 6 = 60.1762 d 6 = (variable)
7 = 41.0046 d 7 = 2.0000 n d4 =1.72916 ν d4 =54.68 r 7 = 41.0046 d 7 = 2.0000 n d4 = 1.72916 ν d4 = 54.68
8 = 8.8714 d 8 = 5.8748 n d5 =1.64769 ν d5 =33.79 r 8 = 8.8714 d 8 = 5.8748 n d5 = 1.64769 ν d5 = 33.79
9 = 90.3027 d 9 = 1.0000 r 9 = 90.3027 d 9 = 1.0000
10 = -22.7154 d 10 = 5.0119 n d6 =1.69895 ν d6 =30.13 r 10 = -22.7154 d 10 = 5.0119 n d6 = 1.69895 ν d6 = 30.13
11 = -8.5801 d 11 = 2.5582 n d7 =1.80100 ν d7 =34.97 r 11 = -8.5801 d 11 = 2.5582 n d7 = 1.80100 ν d7 = 34.97
12 = -36.0826 d 12 = 0.8188 r 12 = -36.0826 d 12 = 0.8188
13 = 47.3492 d 13 = 3.7261 n d8 =1.77250 ν d8 =49.60 r 13 = 47.3492 d 13 = 3.7261 n d8 = 1.77250 ν d8 = 49.60
14 = -577.3278 d 14 = (可変) r 14 = -577.3278 d 14 = (variable)
15 = ∞(絞り) d 15 = (可変) r 15 = ∞ (aperture) d 15 = (variable)
16 = -51.1868 d 16 = 1.5000 n d9 =1.80518 ν d9 =25.42 r 16 = -51.1868 d 16 = 1.5000 n d9 = 1.80518 ν d9 = 25.42
17 = 30.5800 d 17 = 4.9360 n d10 =1.48749 ν d10 =70.23 r 17 = 30.5800 d 17 = 4.9360 n d10 = 1.48749 ν d10 = 70.23
18 = -81.0257 d 18 = 0.1500 r 18 = -81.0257 d 18 = 0.1500
19 = 34.6262(非球面) d 19 = 6.6319 n d11 =1.43875 ν d11 =94.93 r 19 = 34.6262 (aspherical) d 19 = 6.6319 n d11 = 1.43875 ν d11 = 94.93
20 = -21.7282(非球面) d 20 = 0.1500 r 20 = -21.7282 (non-spherical) d 20 = 0.1500
21 = -134.0324 d 21 = 5.7167 n d12 =1.51633 ν d12 =64.14 r 21 = -134.0324 d 21 = 5.7167 n d12 = 1.51633 ν d12 = 64.14
22 = -21.3461 d 22 = (可変) r 22 = -21.3461 d 22 = (variable)
23 = ∞ d 23 = 4.2000 n d13 =1.51633 ν d13 =64.14 r 23 = ∞ d 23 = 4.2000 n d13 = 1.51633 ν d13 = 64.14
24 = ∞ d 24 = 2.5037 r 24 = ∞ d 24 = 2.5037
25 = ∞(像面) r 25 = ∞ (image plane)
非球面係数 第4面 K = -0.9388 Aspherical coefficients fourth surface K = -0.9388
4 = -6.7494 ×10 -6 A 4 = -6.7494 × 10 -6
6 = -1.2010 ×10 -7 A 6 = -1.2010 × 10 -7
8 = -1.1977 ×10 -9 A 8 = -1.1977 × 10 -9
10 = 0.0000 A 10 = 0.0000
第19面 K = -6.0521 Nineteenth Surface K = -6.0521
4 = -1.4568 ×10 -5 A 4 = -1.4568 × 10 -5
6 = 7.8521 ×10 -8 A 6 = 7.8521 × 10 -8
8 = -3.7664 ×10 -10 A 8 = -3.7664 × 10 -10
10 = 0.0000 A 10 = 0.0000
第20面 K = 0 20th surface K = 0
4 = 2.6936 ×10 -5 A 4 = 2.6936 × 10 -5
6 = 6.8110 ×10 -8 A 6 = 6.8110 × 10 -8
8 = -1.5114 ×10 -10 A 8 = -1.5114 × 10 -10
10 = 0.0000 A 10 = 0.0000
可変間隔 d 0 ∞ 150.00000 Variable spacing d 0 ∞ 150.00000
6 5.53502 5.95355 d 6 5.53502 5.95355
14 1.00000 1.02741 d 14 1.00000 1.02741
15 4.50900 3.12971 d 15 4.50900 3.12971
22 30.00000 30.93335 。 d 22 30.00000 30.93335.


実施例3 Example 3
f =12.20 f = 12.20
ω =41.57 ° ω = 41.57 °
B =35.270 f B = 35.270
IM =21.64 IM = 21.64
2 =51.73 f 2 = 51.73
B /IM=1.63 f B /IM=1.63
2 /f =4.24 f 2 / f = 4.24
1 = 27.1466 d 1 = 2.0000 n d1 =1.72916 ν d1 =54.68 r 1 = 27.1466 d 1 = 2.0000 n d1 = 1.72916 ν d1 = 54.68
2 = 14.9781 d 2 = 6.7472 r 2 = 14.9781 d 2 = 6.7472
3 = 19.4345 d 3 = 2.0000 n d2 =1.72916 ν d2 =54.68 r 3 = 19.4345 d 3 = 2.0000 n d2 = 1.72916 ν d2 = 54.68
4 = 13.9731 d 4 = 2.7937 r 4 = 13.9731 d 4 = 2.7937
5 = 16.9952 d 5 = 2.0000 n d3 =1.49700 ν d3 =81.54 r 5 = 16.9952 d 5 = 2.0000 n d3 = 1.49700 ν d3 = 81.54
6 = 10.6814(非球面) d 6 = (可変) r 6 = 10.6814 (aspherical) d 6 = (Variable)
7 = 35.0430 d 7 = 2.0000 n d4 =1.72916 ν d4 =54.68 r 7 = 35.0430 d 7 = 2.0000 n d4 = 1.72916 ν d4 = 54.68
8 = 10.2257 d 8 = 6.7784 n d5 =1.72825 ν d5 =28.46 r 8 = 10.2257 d 8 = 6.7784 n d5 = 1.72825 ν d5 = 28.46
9 = -141.4052 d 9 = 4.6624 r 9 = -141.4052 d 9 = 4.6624
10 = -42.6858 d 10 = 4.0090 n d6 =1.60311 ν d6 =60.64 r 10 = -42.6858 d 10 = 4.0090 n d6 = 1.60311 ν d6 = 60.64
11 = -10.1899 d 11 = 1.4000 n d7 =1.80518 ν d7 =25.42 r 11 = -10.1899 d 11 = 1.4000 n d7 = 1.80518 ν d7 = 25.42
12 = -30.3384 d 12 = (可変) r 12 = -30.3384 d 12 = (variable)
13 = ∞(絞り) d 13 = (可変) r 13 = ∞ (aperture) d 13 = (variable)
14 = -31.5466 d 14 = 1.5000 n d8 =1.80100 ν d8 =34.97 r 14 = -31.5466 d 14 = 1.5000 n d8 = 1.80100 ν d8 = 34.97
15 = 25.0509 d 15 = 4.5966 n d9 =1.48749 ν d9 =70.23 r 15 = 25.0509 d 15 = 4.5966 n d9 = 1.48749 ν d9 = 70.23
16 = -31.4552 d 16 = 0.1500 r 16 = -31.4552 d 16 = 0.1500
17 = 49.5784 d 17 = 3.6959 n d10 =1.49700 ν d10 =81.54 r 17 = 49.5784 d 17 = 3.6959 n d10 = 1.49700 ν d10 = 81.54
18 = -42.7447(非球面) d 18 = 0.1500 r 18 = -42.7447 (non-spherical) d 18 = 0.1500
19 = -415.3378 d 19 = 5.5499 n d11 =1.72916 ν d11 =54.68 r 19 = -415.3378 d 19 = 5.5499 n d11 = 1.72916 ν d11 = 54.68
20 = -22.6252 d 20 = (可変) r 20 = -22.6252 d 20 = (variable)
21 = ∞ d 21 = 4.2000 n d12 =1.51633 ν d12 =64.14 r 21 = ∞ d 21 = 4.2000 n d12 = 1.51633 ν d12 = 64.14
22 = ∞ d 22 = 2.4997 r 22 = ∞ d 22 = 2.4997
23 = ∞(像面) r 23 = ∞ (image plane)
非球面係数 第6面 K = -0.8190 Aspherical coefficients sixth surface K = -0.8190
4 = -4.5482 ×10 -5 A 4 = -4.5482 × 10 -5
6 = -3.0420 ×10 -7 A 6 = -3.0420 × 10 -7
8 = -1.0248 ×10 -9 A 8 = -1.0248 × 10 -9
10 = 0.0000 A 10 = 0.0000
第18面 K = 0 The eighteenth surface K = 0
4 = 2.8776 ×10 -5 A 4 = 2.8776 × 10 -5
6 = 1.2964 ×10 -8 A 6 = 1.2964 × 10 -8
8 = -1.8297 ×10 -11 A 8 = -1.8297 × 10 -11
10 = 0.0000 A 10 = 0.0000
可変間隔 d 0 ∞ 150.00000 Variable spacing d 0 ∞ 150.00000
6 11.90487 13.59517 d 6 11.90487 13.59517
12 2.87862 1.00000 d 12 2.87862 1.00000
13 8.48326 8.49462 d 13 8.48326 8.49462
20 30.00000 30.17692 。 d 20 30.00000 30.17692.

図7は、本発明の撮影レンズ系を用い、撮像素子として小型のCCD又はC−MOS等を用いた一眼レフレックスカメラの断面図である。 7, using the imaging lens system of the present invention, a cross-sectional view of a single-lens reflex camera using a small CCD or C-MOS or the like as an imaging device. 図7において、1は一眼レフレックスカメラ、2は合焦機構を備えた鏡筒内に配置された撮影レンズ系、3は撮影レンズ系2を一眼レフレックスカメラ1に着脱可能とする鏡筒のマウント部であり、スクリュータイプのマウントやバヨネットタイプのマウント等が用いられる。 7, 1 is a single-lens reflex camera, 2 a photographing lens system arranged in a lens barrel having a focusing mechanism, 3 is a lens barrel which is detachably mountable to the imaging lens system 2 in a single-lens reflex camera 1 a mount portion, the mount or the like of the screw type of mount and bayonet type is used. この例では、バヨネットタイプのマウントを用いている。 In this example, the bayonet type mount is used.

また、4は撮像素子面、5は撮影レンズ系2の光路6上のレンズ系と撮像素子面4との間に配置されたクイックリターンミラー、7はクイックリターンミラー5より反射された光路に配置されたファインダースクリーン、8はペンタプリズム、9はファインダー、Eは観察者の眼(アイポイント)である。 Further, the image pickup element surface 4, 5 quick return mirror disposed between the lens system and the imaging device surface 4 on the optical path 6 of the imaging lens system 2, 7 disposed in an optical path that is reflected from the quick return mirror 5 been finder screen, 8 a pentagonal prism, 9 viewfinder, E is an observer's eye (eye point).

このような構成の一眼レフレックスカメラ1の撮影レンズ系2として、例えば上記実施例1〜3に示した本発明の撮影レンズ系が用いられる。 As the imaging lens system 2 of the single-lens reflex camera 1 configured as described above, for example, the imaging lens system of the present invention shown in Examples 1-3 above are used.

本発明の実施例1の撮影レンズ系の無限遠物点合焦時(a)及び至近物点合焦時(b)の光軸に沿うレンズ断面図である。 It is a lens cross-sectional view along an optical axis at an infinite object point focusing of the taking lens system of Example 1 (a) and at near object point focusing (b) of the present invention. 本発明の実施例2の撮影レンズ系の図1と同様の図である。 It is a similar view to Figure 1 of the imaging lens system of Example 2 of the present invention. 本発明の実施例3の撮影レンズ系の図1と同様の図である。 It is a similar view to Figure 1 of the imaging lens system of Example 3 of the present invention. 実施例1の無限遠物点合焦時(a)及び至近物点合焦時(b)の球面収差、像面湾曲、歪曲収差、倍率色収差の収差図である。 Spherical aberration, curvature of field, distortion at the time of infinite object point focusing of Example 1 (a) and at near object point focusing (b), is an aberration diagram of lateral chromatic aberration. 実施例2の図4と同様の図である。 It is a view similar to Figure 4 of the second embodiment. 実施例3の図4と同様の図である。 It is a view similar to Figure 4 of the third embodiment. 本発明の撮影レンズ系を用いた一眼レフレックスカメラの断面図である。 It is a cross-sectional view of a single-lens reflex camera using an imaging lens system of the present invention.

符号の説明 DESCRIPTION OF SYMBOLS

G1…第1レンズ群G2…第2レンズ群G3…第3レンズ群S…明るさ絞りF…ローパスフィルターの平行平板I…像面E…観察者の眼(アイポイント) G1 ... the first lens group G2 ... the second lens group G3 ... third lens group S ... aperture stop F ... parallel plate I ... image plane E of the low-pass filter ... observer's eye (eye point)
1…一眼レフレックスカメラ2…撮影レンズ系3…マウント部4…撮像素子面5…クイックリターンミラー6…光路7…ファインダースクリーン8…ペンタプリズム9…ファインダー 1 ... single-lens reflex camera 2 ... photographing lens system 3 ... mount portion 4 ... image sensor surface 5 ... quick return mirror 6 ... optical path 7 ... finder screen 8 ... pentaprism 9 ... Finder

Claims (13)

  1. 物体側から順に、負の屈折力を有する第1レンズ群と、正の屈折力を有する第2レンズ群と、明るさ絞りと、正の屈折力を有する第3レンズ群とを有し、 Has in order from the object side, a first lens group having negative refractive power, a second lens group having positive refractive power, and an aperture stop, a third lens group having a positive refractive power,
    前記第1レンズ群を固定した状態で、前記第2レンズ群が無限遠距離の合焦時の位置に対して有限遠距離の合焦時の位置が像側に位置し、前記第3レンズ群が無限遠距離の合焦時の位置に対して有限遠距離の合焦時の位置が物体側に位置することで、無限遠距離から有限遠距離へのフォーカシングを行うことを特徴とする撮影レンズ系。 While fixing the first lens group, the position of the in-focus state of the finite far the second lens group relative to the position of the in-focus state of the infinite distance is positioned at the image side, the third lens group There is the position of the in-focus state of the finite far relative to the position of the in-focus state of infinite distance is located on the object side, a photographing lens which is characterized in that the focusing to a finite far from infinite distance system.
  2. 無限遠距離から有限遠距離へのフォーカシングの際に、前記第2レンズ群は像側のみに移動し、前記第3レンズ群は物体側のみに移動することを特徴とする請求項1記載の撮影レンズ系。 When the infinite distance focusing to a finite far, photographing of the second lens group moves only toward the image side, according to claim 1, wherein said third lens group is characterized in that moves only toward the object side lens system.
  3. 前記第1レンズ群と前記第3レンズ群は非球面を有し、前記第1レンズ群における非球面は、少なくとも前記第1レンズ群における最も像面側の屈折面に配したことを特徴とする請求項1又は2記載の撮影レンズ系。 Having said first lens group and the third lens group aspherical, the aspherical surface at the first lens group is characterized in that arranged at least on the refractive surface on the most image side in the first lens group according to claim 1 or 2, wherein the taking lens system.
  4. 前記第3レンズ群の射出面から像面までの空気換算長をf B 、撮影レンズ系のイメージサークル(直径)をIMとしたとき、以下の条件を満足することを特徴とする請求項1から3の何れか1項記載の撮影レンズ系。 The third lens group f B equivalent air length from the image plane from the exit surface, when the image circle of the imaging lens system (diameter) was IM, claim 1, characterized in that the following condition is satisfied taking lens system according to any one of the three.
    B /IM>1.5 ・・・(1) f B /IM>1.5 ··· (1)
  5. 前記第2レンズ群の焦点距離をf 2 、撮影レンズの全系の焦点距離をfとしたとき、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4の何れか1項記載の撮影レンズ系。 F 2 the focal length of the second lens group, the focal length of the entire system of the imaging lens is f, according to any one of claims 1 4, characterized by satisfying the following condition taking lens system.
    2 /f>5.0 ・・・(2) f 2 /f>5.0 ··· (2)
  6. 前記第1レンズ群の物体側から数えて2枚目に配されるレンズが正レンズであることを特徴とする請求項1から5の何れか1項記載の撮影レンズ系。 Taking lens system of any one of claims 1 to 5, characterized in that the lens arranged on the second sheet as counted from the object side of the first lens group is a positive lens.
  7. 前記第1レンズ群の物体側から数えて2枚目に配されるレンズが物体側に凸面を向けた正メニスカスレンズであることを特徴とする請求項1から5の何れか1項記載の撮影レンズ系。 Photographing according to any one of claims 1-5, characterized in that the lens arranged on the second sheet as counted from the object side of the first lens group is a positive meniscus lens having a convex surface directed toward the object side lens system.
  8. 前記第1レンズ群の最も像面側に配されるレンズが正レンズであることを特徴とする請求項1から7の何れか1項記載の撮影レンズ系。 Taking lens system of any one of claims 1 to 7, characterized in that the lens arranged on the most image side of the first lens group is a positive lens.
  9. 前記第1レンズ群の最も像面側に配されるレンズが物体側に凸面を向けた正メニスカスレンズであることを特徴とする請求項1から7の何れか1項記載の撮影レンズ系。 Taking lens system of any one of claims 1 to 7, the lens most disposed to the image plane side of the first lens group being a positive meniscus lens having a convex surface directed toward the object side.
  10. 前記明るさ絞りよりも像側に配される前記第3レンズ群が、物体側から順に、負の屈折力を有する3−1サブユニット、正の屈折力を有する3−2サブユニット、負の屈折力のレンズと正の屈折力のレンズを有する3−3サブユニットを有することを特徴とする請求項1から9の何れか1項記載の撮影レンズ系。 The third lens group which is disposed on the image side of the aperture stop, in order from the object side, 3-1 subunits having a negative refractive power, 3-2 subunits having a positive refractive power, negative the refractive power of the lens and a positive photographic lens system of any one of claims 1 to 9, characterized in that it comprises a 3-3 subunits having a lens refractive power.
  11. 前記明るさ絞りよりも像側に配される前記第3レンズ群が、物体側から順に、負の屈折力を有する3−1サブユニット、正の屈折力を有する3−2サブユニットを有することを特徴とする請求項1から9の何れか1項記載の撮影レンズ系。 The third lens group which is disposed on the image side of the aperture stop is, to have in order from the object side, 3-1 subunits having negative refractive power, the 3-2 subunit having a positive refractive power taking lens system of any one of claims 1 9, characterized in.
  12. 前記第1レンズ群乃至前記第3レンズ群を保持する保持枠と、前記保持枠を撮影装置本体部に着脱可能とするマウント部とを備えたことを特徴とする請求項1から11の何れか1項記載の撮影レンズ系。 A holding frame that holds the first lens group to the third lens group, any one of claims 1 to 11, characterized in that a mounting portion for detachably mountable to the holding frame to the imaging device main unit taking lens system according Section 1.
  13. 請求項1から12の何れか1項記載の撮影レンズ系と、前記撮影レンズ系の像面側に配された撮像素子とを備えたことを特徴とする撮影装置。 A taking lens system of any one of claims 1 12, wherein the imaging lens system imaging apparatus characterized by comprising an image pickup device disposed on the image plane side of the.
JP2003425108A 2003-12-22 2003-12-22 Photographing lens system and photographing apparatus having the system Pending JP2005181852A (en)

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US11016734 US7215481B2 (en) 2003-12-22 2004-12-21 Taking lens, and imaging device incorporating the same

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005316398A (en) * 2004-03-31 2005-11-10 Nikon Corp Super wide-angle lens and photographing apparatus equipped with same
EP1837693A1 (en) 2006-03-23 2007-09-26 Nikon Corporation Retrofocus lens system and image-taking device
JP2010191077A (en) * 2009-02-17 2010-09-02 Canon Inc Photographic lens and image pickup apparatus having the same
JP2011102865A (en) * 2009-11-10 2011-05-26 Nikon Corp Wide angle lens, image pickup device, and method for manufacturing the wide angle lens
JP2011102871A (en) * 2009-11-10 2011-05-26 Nikon Corp Wide angle lens, image pickup device, and method for manufacturing the wide angle lens
JP2011180225A (en) * 2010-02-26 2011-09-15 Nikon Corp Imaging lens, optical apparatus including imaging lens and method for manufacturing imaging lens
JP2011227351A (en) * 2010-04-21 2011-11-10 Hoya Corp Wide-angle lens system
JP2013007856A (en) * 2011-06-23 2013-01-10 Ricoh Co Ltd Imaging lens, camera device, and portable information terminal device
US8699143B2 (en) 2009-11-10 2014-04-15 Nikon Corporation Wide-angle lens, imaging apparatus, and method for manufacturing wide-angle lens
US8824059B2 (en) 2011-05-30 2014-09-02 Pentax Ricoh Imaging Company, Ltd. Zoom lens system and optical instrument using the same

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03278012A (en) * 1990-03-28 1991-12-09 Sigma Corp Inner focus type macro-lens
JPH04118612A (en) * 1990-08-04 1992-04-20 Fuji Photo Optical Co Ltd Retrofocus type wide-angle lens
JPH11119094A (en) * 1997-10-17 1999-04-30 Mark:Kk Retrofocusing wide-angle lens having large diameter ratio
JPH11194266A (en) * 1997-10-29 1999-07-21 Fuji Photo Optical Co Ltd Wide angle lens
JP2001116993A (en) * 1999-10-19 2001-04-27 Canon Inc Zoom lens
JP2001188172A (en) * 1999-12-28 2001-07-10 Canon Inc Retrofocus type zoom lens and optical equipment with it
JP2002031754A (en) * 2000-07-14 2002-01-31 Hitachi Ltd Lens device for projection and projection type picture display device
JP2002303790A (en) * 2001-04-05 2002-10-18 Mamiya Op Co Ltd Retrofocus type very wideangle lens
JP2003043350A (en) * 2001-07-30 2003-02-13 Pentax Corp Wide-angle lens system
JP2003241084A (en) * 2002-02-15 2003-08-27 Canon Inc Image focusing lens and image pickup device using the same

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03278012A (en) * 1990-03-28 1991-12-09 Sigma Corp Inner focus type macro-lens
JPH04118612A (en) * 1990-08-04 1992-04-20 Fuji Photo Optical Co Ltd Retrofocus type wide-angle lens
JPH11119094A (en) * 1997-10-17 1999-04-30 Mark:Kk Retrofocusing wide-angle lens having large diameter ratio
JPH11194266A (en) * 1997-10-29 1999-07-21 Fuji Photo Optical Co Ltd Wide angle lens
JP2001116993A (en) * 1999-10-19 2001-04-27 Canon Inc Zoom lens
JP2001188172A (en) * 1999-12-28 2001-07-10 Canon Inc Retrofocus type zoom lens and optical equipment with it
JP2002031754A (en) * 2000-07-14 2002-01-31 Hitachi Ltd Lens device for projection and projection type picture display device
JP2002303790A (en) * 2001-04-05 2002-10-18 Mamiya Op Co Ltd Retrofocus type very wideangle lens
JP2003043350A (en) * 2001-07-30 2003-02-13 Pentax Corp Wide-angle lens system
JP2003241084A (en) * 2002-02-15 2003-08-27 Canon Inc Image focusing lens and image pickup device using the same

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005316398A (en) * 2004-03-31 2005-11-10 Nikon Corp Super wide-angle lens and photographing apparatus equipped with same
EP1837693A1 (en) 2006-03-23 2007-09-26 Nikon Corporation Retrofocus lens system and image-taking device
US7656591B2 (en) 2006-03-23 2010-02-02 Nikon Corporation Retrofocus lens system and image-taking device
EP3242151A1 (en) 2006-03-23 2017-11-08 Nikon Corporation Retrofocus lens system and image-taking device
JP2010191077A (en) * 2009-02-17 2010-09-02 Canon Inc Photographic lens and image pickup apparatus having the same
JP2011102865A (en) * 2009-11-10 2011-05-26 Nikon Corp Wide angle lens, image pickup device, and method for manufacturing the wide angle lens
JP2011102871A (en) * 2009-11-10 2011-05-26 Nikon Corp Wide angle lens, image pickup device, and method for manufacturing the wide angle lens
US9164260B2 (en) 2009-11-10 2015-10-20 Nikon Corporation Wide-angle lens, imaging apparatus, and method for manufacturing wide-angle lens
US8699143B2 (en) 2009-11-10 2014-04-15 Nikon Corporation Wide-angle lens, imaging apparatus, and method for manufacturing wide-angle lens
US8625209B2 (en) 2010-02-26 2014-01-07 Nikon Corporation Imaging lens, optical apparatus including imaging lens and method for manufacturing imaging lens
JP2011180225A (en) * 2010-02-26 2011-09-15 Nikon Corp Imaging lens, optical apparatus including imaging lens and method for manufacturing imaging lens
JP2011227351A (en) * 2010-04-21 2011-11-10 Hoya Corp Wide-angle lens system
US8824059B2 (en) 2011-05-30 2014-09-02 Pentax Ricoh Imaging Company, Ltd. Zoom lens system and optical instrument using the same
JP2013007856A (en) * 2011-06-23 2013-01-10 Ricoh Co Ltd Imaging lens, camera device, and portable information terminal device

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