JPH06148518A - Photographic lens - Google Patents

Photographic lens

Info

Publication number
JPH06148518A
JPH06148518A JP31444592A JP31444592A JPH06148518A JP H06148518 A JPH06148518 A JP H06148518A JP 31444592 A JP31444592 A JP 31444592A JP 31444592 A JP31444592 A JP 31444592A JP H06148518 A JPH06148518 A JP H06148518A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
lens
group
negative
positive
present invention
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
JP31444592A
Other languages
Japanese (ja)
Other versions
JP3324802B2 (en )
Inventor
Tsutomu Uzawa
勉 鵜澤
Original Assignee
Olympus Optical Co Ltd
オリンパス光学工業株式会社
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

Links

Abstract

PURPOSE: To provide the correction of favorable aberrations by composing a lens system of a first group which is negative and a second group which is positive in order from the object side, the first group comprising a single negative lens, and the second group comprising negative meniscus lens in the order of negative/positive or positive/ negative, and a biconvex lens satisfying specified conditions.
CONSTITUTION: A lens system comprises a first group of a negative refraction force, and a second group of a positive refraction force, the first group comprises a single negative lens only, and the second group comprises two lenses of a negative meniscus lens and a biconvex lens. This lens system satisfies inequalities I-III. ν1 is an Abbe number of the negative lens in the first group, ν2p, ν2 are Abbe numbers of the positive lens and the negative lens (biconvex lens and negative meniscus lens) in the second group respectively, n2p, n2n, are refraction factors of the positive lens and the negative lens in the second group respectively, r2p, r2n, are radiuses of curvatures of facing surfaces of the positive lens and the negative lens in the second group respectively (r2p=r2n for the radius of curvature of Joint surfaces in case of a joint lens), and (f) is a focal distance of the whole system.
COPYRIGHT: (C)1994,JPO&Japio

Description

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

【0001】 [0001]

【産業上の利用分野】本発明は、車載カメラなどに用いられる撮影レンズに関するものである。 The present invention relates to relates to a photographic lens used like a vehicle-mounted camera.

【0002】 [0002]

【従来の技術】車載カメラ用の撮影レンズとして、例えば特開平3−321213号公報に記載されたものがある。 2. Description of the Related Art As a photographing lens for vehicle camera, is disclosed in Japanese Unexamined Patent Publication No. 3-321213. この撮影レンズは、構成レンズ枚数が8枚と多い。 The taking lens, number of lens elements is eight and often.
又構成レンズ枚数の少ないビデオカメラ用レンズ系として例えば特開平2−7712号に記載されたレンズ系や特開平2−208617号公報中に第5実施例として記載されているレンズ系がある。 Also there is a lens system which is described as the fifth embodiment the lens system and in JP-A-2-208617 discloses described in JP number of lenses less video camera lens system as for example JP-A-2-7712. これらレンズ系のうち前者のレンズ系は2枚のレンズで又後者のレンズ系は3枚のレンズにて構成されている。 The former lens system of these lens systems are also latter lens system of two lenses is constituted by three lenses.

【0003】 [0003]

【発明が解決しようとする課題】前記従来例のうち特開平2−7712号および特開平2−208617号公報の実施例2のレンズ系は、ともに構成枚数が少ないがそのために色収差特に倍率の色収差が補正不足ぎみである。 [0005] The lens system of Example 2 of JP-A 2-7712 and No. Hei 2-208617 discloses one example of the related art, but together constitute a small number chromatic aberration of chromatic aberration, especially the magnification for the There is a correction scarce. これらは物体側から順に絞りを挟んで負,正のパワー配置のレンズ系で、広角化にとって有利であり又バックフォーカスを確保しやすいタイプになっている。 These negative across the aperture from the object side, a positive power arrangement of the lens system, has become easier type to ensure advantageous and also back focus for a wider angle. しかし絞りに対して非対称なパワー配置であるために、歪曲収差や倍率の色収差が補正不足になりやすい。 However, because of the asymmetrical power distribution with respect to the diaphragm, chromatic distortion and magnification tends to become under-corrected.

【0004】車載カメラ用レンズは、歪曲収差に関しては写真レンズに比べると許容範囲が広いためあまり問題にはならないが、倍率の色収差は充分に補正する必要がある。 [0004] The lens vehicle-mounted camera, but not in much of a problem because there is a wide and acceptable range compared to the camera lens with respect to distortion, chromatic aberration of magnification, it is necessary to sufficiently corrected.

【0005】本発明は、少ない枚数でありながら倍率の色収差をはじめとする諸収差が良好に補正された車載カメラ用レンズに好適な撮影レンズを提供することを目的としている。 [0005] The present invention aims that the various aberrations including chromatic aberration of magnification, yet smaller number provide suitable taking lens satisfactorily corrected vehicle camera lens.

【0006】 [0006]

【課題を解決するための手段】本発明の撮影レンズは、 Means for Solving the Problems] photographing lens of the present invention,
物体側より順に、負の屈折力の第1群と、正の屈折力の第2群とよりなり、第1群は1枚の負レンズのみからなり又第2群は1枚の負のメニスカスレンズと1枚の両凸レンズの2枚のレンズより構成されている。 In order from the object side, a first lens unit of negative refractive power, and more becomes a second lens unit of positive refractive power, the first group consisted also second group of only one negative lens of one negative meniscus It is formed of a lens and one of the two lenses of biconvex lens. そしてこのレンズ系は、次の条件(1),(2),(3)を満足するものである。 And this lens system satisfies the following condition (1), (2), and satisfies the (3). (1) ν 1 >40 (2) ν 2p −ν 2n >10 (3) (n 2n −n 2p )×{2/(|r 2n |+|r 2p (1) ν 1> 40 ( 2) ν 2p -ν 2n> 10 (3) (n 2n -n 2p) × {2 / (| r 2n | + | r 2p
|)}×f>0.48 ただしν 1は第1群の負レンズのアッベ数、ν 2p ,ν |)} × f> 0.48, however [nu 1 Abbe number of the negative lens in the first lens group, ν 2p, ν
2nは夫々第2群の正レンズ,負レンズ(両凸レンズ、負のメニスカスレンズ)のアッベ数、n 2p ,n 2nは夫々第2群の正レンズ,負レンズの屈折率、r 2p ,r 2nは夫々第2群の正レンズと負レンズの互いに向かい合う面の曲率半径(接合レンズの場合は接合面の曲率半径であってr 2p =r 2n )、fは全系の焦点距離である。 2n are each positive lens of the second group, the Abbe number of the negative lens (biconvex lens, a negative meniscus lens), n 2p, n 2n are each positive lens of the second group, the refractive index of the negative lens, r 2p, r 2n are each curvature facing each other surface of the positive lens and the negative lens of the second group radius (r 2p = r 2n a radius of curvature of the cemented surface in the case of the cemented lens), f is the focal length of the entire system.

【0007】車載カメラ用レンズは、無限遠程度の遠景から車体付近までの広い範囲を同時にピントがあった状態にて観察し得る必要性がある。 [0007] Lens-vehicle camera, there is a need to be observed from an infinite degree of distant view in a state where there is simultaneously focus a wide range up to the vicinity of the vehicle body. そのためには、広い視写界深度を持つレンズ系であることが望まれる。 For this purpose, it is desired that a lens system having a wide viewing depth of field. 又一般の監視カメラは、主として屋内や夜間等の比較的暗い場所で使用されることが多いが、車載カメラは、屋外で使用されしかも日中における使用頻度が高い。 The general monitoring cameras, primarily but indoors or is often used in a relatively dark place such as at night, the vehicle-mounted camera, is frequently used in used Moreover daytime outdoors. したがって車載カメラはFナンバーが大であっても良く、そのため、レンズ枚数の削減にとって有利である。 Therefore vehicle camera may be a F-number is large, therefore, it is advantageous for reducing the number of lenses.

【0008】以上のことから、本発明の撮影レンズは前述のようなレンズ構成にした。 [0008] From the above, the imaging lens of the present invention has the lens configuration as described above.

【0009】前述の本発明のレンズ系のようなタイプの場合、レンズ枚数を最も少なくするためには、第1群を1枚の負レンズ、第2群を1枚の正レンズにて構成することになるが、倍率の色収差を補正するためには、少なくとも更に1枚のレンズを加える必要がある。 [0009] For type such as a lens system of the present invention described above, in order to the least the number of lenses constitute a first group of one negative lens, the second group at one positive lens thereby, but in order to correct lateral chromatic aberration, it is necessary to add at least further one lens. その場合第2群に1枚の負レンズを加えるのが最も効果的である。 In that case the second group to add the one negative lens which is most effective. そして更に前掲の条件(1),(2),(3)を満足することが好ましい。 And further supra condition (1), (2), it is preferable to satisfy (3).

【0010】条件(1),(2)は、各群内での色収差の発生を抑え、全体として色収差を良好に補正するための条件である。 [0010] Condition (1), (2), suppress the occurrence of chromatic aberration in each group is a condition for favorably correcting chromatic aberration as a whole.

【0011】条件(1)を満足しないと倍率の色収差が補正不足になる。 [0011] The chromatic aberration of If you do not satisfy the condition (1) magnification is insufficiently corrected. 又条件(2)の範囲を越えると倍率の色収差、軸上色収差共に補正不足になる。 The chromatic range exceeds the ratio of the condition (2), under-corrected in the axial chromatic aberration both.

【0012】条件(3)は、第2群の正レンズ,負レンズの互いに向かい合った面の屈折力を規定したもので、 [0012] Condition (3) is obtained by defining the positive lens of the second group, the refractive power of the surfaces facing each other of the negative lens,
条件(3)の範囲を越えると、主として球面収差、コマ収差が補正不足になる。 Exceeds the range of the condition (3), mainly spherical aberration, coma aberration is under-corrected.

【0013】尚第2群は、物体側から順に負レンズ,正レンズでも正レンズ,負レンズのいずれでも良い。 [0013] Note that the second group, a negative lens in order from the object side, in the positive lens positive lens may be either a negative lens.

【0014】本発明の撮影レンズにおいて、更に第1 [0014] In the imaging lens of the present invention, further first
群、第2群が次の条件(4),(5)を満足すれば一層好ましい。 Group, the second group following condition (4), more preferable to satisfy (5). (4) −4<f 1 /f<−0.95 (5) 0.85<f 2 /f<2 ただし、f 1 ,f 2は夫々第1群、第2群の焦点距離である。 (4) -4 <f 1 /f<-0.95 (5) 0.85 <f 2 / f <2 However, f 1, f 2 are each first group, the focal length of the second group.

【0015】条件(4),(5)は、主としてレンズ系を更に小型化するための条件であって、両群の屈折力を夫々規定したものである。 [0015] Condition (4), (5) it is a condition for the further miniaturization primarily lens system, in which the refractive power of the two groups were respectively defined. 条件(4)又は条件(5)の下限を越えるとバックフォーカスを確保する上で不利になり、フィルター等の光学材料を配置しにくくなる。 Conditions become disadvantageous in securing the back focus Below the lower limit of (4) or the condition (5), it is difficult to place an optical material such as a filter. 又ペッツバール和が正の大きな値になりやすい。 The Petzval sum is likely to be a large positive value. 逆に条件(4)又は条件(5)の上限を越えるとバックフォーカスを確保する上では好ましいが全長が大になりやすい。 Conversely the condition (4) or prone to a preferred but overall length large than on ensuring back focus exceeds the upper limit of the condition (5).

【0016】更に第1群に光軸が離れるにしたがって負の屈折力が弱くなる非球面を設けることが望ましい。 Furthermore it is desirable to provide an aspherical surface negative refractive power becomes weaker as the optical axis leaves the first group. 車載カメラ用レンズ系において、画像の歪みは画像の鮮鋭さに比べ軽視されていたが、より正確で安全な視野の確認のためには、歪曲収差が補正されていることが望ましい。 In the lens system for vehicle camera, but image distortion had been neglected compared with sharpness of the image, for more accurate confirmation of safe vision, it is desirable that the distortion aberration is corrected. 前述のような非球面を第1群に用いることが効果的であり、これにより歪曲収差を良好に補正出来る。 The aspherical surface as described above is that is effective to use the first group, thereby making favorably correct distortion.

【0017】更に、車載カメラは、車体との位置関係によっては、側方あるいは斜方を向いた光学系が必要である。 Furthermore, the vehicle-mounted camera, depending on the position relationship between the vehicle body, it is necessary optics facing the lateral or oblique. そのため本発明のレンズ系において第1群と第2群との間にプリズムやミラー等の反射部材を配置することが出来、これによって側視あるいは斜視が可能になる。 Therefore it is possible to arrange the reflecting member such as a prism or a mirror between the first and second lens units in the lens system of the present invention, thereby allowing the side view or perspective.
本発明レンズ系の第1群と第2群の間は、軸外光線高が低くここにプリズムや反射部材を配置する場合、これら部材は小さくなし得るので光学系全体を小型にする上で有利である。 During the first group and the second group of the present invention the lens system, when the off-axis ray height is placed here on the prism and the reflection member low, advantageous for the entire optical system compact because these members can make small it is. しかし反射部材の位置は、第1群の物体側又は第2群の像側に配置してもよい。 But the position of the reflecting member may be disposed on the image side of the object side or the second group of the first group.

【0018】尚本発明の撮影レンズは、車載カメラ用以外に一般のビデオカメラや銀塩カメラ用のレンズ系としても使用できる。 [0018] Note that the imaging lens of the present invention can also be used as a lens system for ordinary video camera or film camera in addition to in-vehicle camera.

【0019】 [0019]

【実施例】次に本発明の撮影レンズの各実施例を示す。 EXAMPLES The following each embodiment of the imaging lens of the present invention. 実施例1 f=7mm ,像高=4.2mm ,2ω=62°,F/8 ,像位置(最終面から)=1mm r 1 =18.6732 d 1 =1.0000 n 1 =1.48749 ν 1 =70.20 r 2 =3.7831(非球面)d 2 =9.5367 r 3 =∞(絞り) d 3 =0.7164 r 4 =5.0314 d 4 =2.4019 n 2 =1.84666 ν 2 =23.78 r 5 =2.7656 d 5 =3.6106 n 3 =1.48749 ν 3 =70.20 r 6 =-6.4383 d 6 =7.1787 r 7 =∞ d 7 =4.5300 n 4 =1.54771 ν 4 =62.83 r 8 =∞ d 8 =0.8000 n 5 =1.52420 ν 5 =70.20 r 9 =∞ 非球面係数 P=1.0000,E=-0.99376×10 -3 ,F=0.11082 ×10 -4 G=-0.10100×10 -4 ν 1 =70.2,ν 2p −ν 2n =46.42 (n 2n −n 2p )×{2/(|r 2n |+|r 2p |)}×f=0.698 f 1 /f=-1.42 ,f 2 /f=1.26 Example 1 f = 7 mm, the image height = 4.2mm, 2ω = 62 °, F / 8, the image position (from the last plane) = 1mm r 1 = 18.6732 d 1 = 1.0000 n 1 = 1.48749 ν 1 = 70.20 r 2 = 3.7831 (aspherical) d 2 = 9.5367 r 3 = ∞ ( stop) d 3 = 0.7164 r 4 = 5.0314 d 4 = 2.4019 n 2 = 1.84666 ν 2 = 23.78 r 5 = 2.7656 d 5 = 3.6106 n 3 = 1.48749 ν 3 = 70.20 r 6 = -6.4383 d 6 = 7.1787 r 7 = ∞ d 7 = 4.5300 n 4 = 1.54771 ν 4 = 62.83 r 8 = ∞ d 8 = 0.8000 n 5 = 1.52420 ν 5 = 70.20 r 9 = ∞ aspheric coefficients P = 1.0000, E = -0.99376 × 10 -3, F = 0.11082 × 10 -4 G = -0.10100 × 10 -4 ν 1 = 70.2, ν 2p -ν 2n = 46.42 (n 2n -n 2p) × {2 / (| r 2n | + | r 2p |)} × f = 0.698 f 1 /f=-1.42, f 2 /f=1.26

【0020】実施例2 f=7mm ,像高=4.2mm ,2ω=62°,F/8 ,像位置(最終面から)=1mm r 1 =7.6583(非球面)d 1 =1.1242 n 1 =1.48749 ν 1 =70.20 r 2 =3.3410 d 2 =3.3199 r 3 =∞ d 3 =6.8000 n 2 =1.51633 ν 2 =64.15 r 4 =∞ d 4 =1.0000 r 5 =∞(絞り) d 5 =0.6968 r 6 =6.1028 d 6 =2.6923 n 3 =1.80518 ν 3 =25.43 r 7 =2.2505 d 7 =2.4463 n 4 =1.60342 ν 4 =38.01 r 8 =-6.7210 (非球面)d 8 =5.5492 r 9 =∞ d 9 =4.5300 n 5 =1.54771 ν 5 =62.83 r 10 =∞ d 10 =0.8000 n 6 =1.52420 ν 5 =70.20 r 11 =∞ 非球面係数 (第1面)P=1.0000,E=0.57683 ×10 -3 ,F=0.13 [0020] Example 2 f = 7 mm, the image height = 4.2mm, 2ω = 62 °, F / 8, the image position (from the last plane) = 1mm r 1 = 7.6583 (aspherical) d 1 = 1.1242 n 1 = 1.48749 ν 1 = 70.20 r 2 = 3.3410 d 2 = 3.3199 r 3 = ∞ d 3 = 6.8000 n 2 = 1.51633 ν 2 = 64.15 r 4 = ∞ d 4 = 1.0000 r 5 = ∞ ( stop) d 5 = 0.6968 r 6 = 6.1028 d 6 = 2.6923 n 3 = 1.80518 ν 3 = 25.43 r 7 = 2.2505 d 7 = 2.4463 n 4 = 1.60342 ν 4 = 38.01 r 8 = -6.7210 ( aspherical) d 8 = 5.5492 r 9 = ∞ d 9 = 4.5300 n 5 = 1.54771 ν 5 = 62.83 r 10 = ∞ d 10 = 0.8000 n 6 = 1.52420 ν 5 = 70.20 r 11 = ∞ aspherical coefficients (first surface) P = 1.0000, E = 0.57683 × 10 -3, F = 0.13
353 ×10 -4 G=0.61032 ×10 -6 (第8面)P=1.0000,E=-0.76010×10 -3 ,F=-0.1 353 × 10 -4 G = 0.61032 × 10 -6 ( surface No. 8) P = 1.0000, E = -0.76010 × 10 -3, F = -0.1
9291×10 -3 G=-0.51452×10 -4 ν 1 =70.2,ν 2p −ν 2n =12.58 (n 2n −n 2p )×{2/(|r 2n |+|r 2p |)}×f=0.730 f 1 /f=-1.90 ,f 2 /f=1.15 9291 × 10 -3 G = -0.51452 × 10 -4 ν 1 = 70.2, ν 2p -ν 2n = 12.58 (n 2n -n 2p) × {2 / (| r 2n | + | r 2p |)} × f = 0.730 f 1 /f=-1.90, f 2 /f=1.15

【0021】実施例3 f=7mm ,像高=4.2mm ,2ω=62°,F/8 ,像位置(最終面から)=1mm r 1 =16.4159 d 1 =1.0000 n 1 =1.54814 ν 1 =45.78 r 2 =5.4595 d 2 =7.5840 r 3 =∞ d 3 =6.7200 n 2 =1.80610 ν 2 =40.95 r 4 =∞ d 4 =1.0000 r 5 =∞(絞り) d 5 =0.3187 r 6 =4.1585 d 6 =1.8069 n 3 =1.84666 ν 3 =23.78 r 7 =2.3370 d 7 =1.9711 n 4 =1.51633 ν 4 =64.15 r 8 =-13.2147 d 8 =5.2588 r 9 =∞ d 9 =4.5300 n 5 =1.54771 ν 5 =62.83 r 10 =∞ d 10 =0.8000 n 6 =1.52420 ν 5 =70.20 r 11 =∞ ν 1 =45.78 ,ν 2p −ν 2n =40.37 (n 2n −n 2p )×{2/(|r 2n |+|r 2p |)}×f=0.799 f 1 /f=-2.20 ,f 2 /f=1.22 [0021] Example 3 f = 7 mm, the image height = 4.2mm, 2ω = 62 °, F / 8, the image position (from the last plane) = 1mm r 1 = 16.4159 d 1 = 1.0000 n 1 = 1.54814 ν 1 = 45.78 r 2 = 5.4595 d 2 = 7.5840 r 3 = ∞ d 3 = 6.7200 n 2 = 1.80610 ν 2 = 40.95 r 4 = ∞ d 4 = 1.0000 r 5 = ∞ ( stop) d 5 = 0.3187 r 6 = 4.1585 d 6 = 1.8069 n 3 = 1.84666 ν 3 = 23.78 r 7 = 2.3370 d 7 = 1.9711 n 4 = 1.51633 ν 4 = 64.15 r 8 = -13.2147 d 8 = 5.2588 r 9 = ∞ d 9 = 4.5300 n 5 = 1.54771 ν 5 = 62.83 r 10 = ∞ d 10 = 0.8000 n 6 = 1.52420 ν 5 = 70.20 r 11 = ∞ ν 1 = 45.78, ν 2p -ν 2n = 40.37 (n 2n -n 2p) × {2 / (| r 2n | + | r 2p |)} × f = 0.799 f 1 /f=-2.20, f 2 /f=1.22

【0022】実施例4 f=7mm ,像高=4.2mm ,2ω=62°,F/5.6 像位置(最終面から)=1mm r 1 =12.6075 (非球面)d 1 =0.9327 n 1 =1.48749 ν 1 =70.20 r 2 =3.2614 d 2 =3.4950 r 3 =∞ d 3 =6.7200 n 2 =1.51633 ν 2 =64.15 r 4 =∞ d 4 =1.0000 r 5 =∞(絞り) d 5 =1.3995 r 6 =5.6433 d 6 =2.0240 n 3 =1.80518 ν 3 =25.43 r 7 =3.0491 d 7 =2.5272 n 4 =1.48749 ν 4 =70.20 r 8 =-6.1979 (非球面)d 8 =8.6927 r 9 =∞ d 9 =4.5300 n 5 =1.54771 ν 5 =62.83 r 10 =∞ d 10 =0.8000 n 6 =1.52420 ν 5 =70.20 r 11 =∞ 非球面係数 (第1面)P=1.0000,E=0.95419 ×10 -3 ,F=0.46 [0022] Example 4 f = 7 mm, the image height = 4.2mm, 2ω = 62 °, F / 5.6 image position (from the last plane) = 1mm r 1 = 12.6075 (aspherical) d 1 = 0.9327 n 1 = 1.48749 ν 1 = 70.20 r 2 = 3.2614 d 2 = 3.4950 r 3 = ∞ d 3 = 6.7200 n 2 = 1.51633 ν 2 = 64.15 r 4 = ∞ d 4 = 1.0000 r 5 = ∞ ( stop) d 5 = 1.3995 r 6 = 5.6433 d 6 = 2.0240 n 3 = 1.80518 ν 3 = 25.43 r 7 = 3.0491 d 7 = 2.5272 n 4 = 1.48749 ν 4 = 70.20 r 8 = -6.1979 ( aspherical) d 8 = 8.6927 r 9 = ∞ d 9 = 4.5300 n 5 = 1.54771 ν 5 = 62.83 r 10 = ∞ d 10 = 0.8000 n 6 = 1.52420 ν 5 = 70.20 r 11 = ∞ aspherical coefficients (first surface) P = 1.0000, E = 0.95419 × 10 -3, F = 0.46
297 ×10 -5 G=0.40011 ×10 -6 (第8面)P=1.0000,E=0.16170 ×10 -3 ,F=-0.2 297 × 10 -5 G = 0.40011 × 10 -6 ( surface No. 8) P = 1.0000, E = 0.16170 × 10 -3, F = -0.2
8453×10 -4 G=-0.69306×10 -5 ν 1 =70.2,ν 2p −ν 2n =44.77 (n 2n −n 2p )×{2/(|r 2n |+|r 2p |)}×f=0.729 f 1 /f=-1.33 ,f 2 /f=1.26 8453 × 10 -4 G = -0.69306 × 10 -5 ν 1 = 70.2, ν 2p -ν 2n = 44.77 (n 2n -n 2p) × {2 / (| r 2n | + | r 2p |)} × f = 0.729 f 1 /f=-1.33, f 2 /f=1.26

【0023】実施例5 f=7mm ,像高=4.2mm ,2ω=62°,F/8 ,像位置(最終面から)=1mm r 1 =16.4817 d 1 =1.0000 n 1 =1.48749 ν 1 =70.20 r 2 =5.9725 d 2 =9.6315 r 3 =∞ d 3 =7.0000 n 2 =1.51633 ν 2 =64.15 r 4 =∞ d 4 =1.0000 r 5 =∞(絞り) d 5 =0.1000 r 6 =3.5922 d 6 =1.8015 n 3 =1.84666 ν 3 =23.78 r 7 =2.5625 d 7 =0.4860 r 8 =3.7333 d 8 =2.0000 n 4 =1.48749 ν 4 =70.20 r 9 =-12.1472 d 9 =4.8432 r 10 =∞ d 10 =4.5300 n 5 =1.54771 ν 5 =62.83 r 11 =∞ d 11 =0.8000 n 6 =1.52420 ν 5 =70.20 r 12 =∞ ν 1 =70.2,ν 2p −ν 2n =46.42 (n 2n −n 2p )×{2/(|r 2n |+|r 2p |)}×f=0.989 f 1 /f=-2.83 ,f 2 /f=1.30 [0023] Example 5 f = 7 mm, the image height = 4.2mm, 2ω = 62 °, F / 8, the image position (from the last plane) = 1mm r 1 = 16.4817 d 1 = 1.0000 n 1 = 1.48749 ν 1 = 70.20 r 2 = 5.9725 d 2 = 9.6315 r 3 = ∞ d 3 = 7.0000 n 2 = 1.51633 ν 2 = 64.15 r 4 = ∞ d 4 = 1.0000 r 5 = ∞ ( stop) d 5 = 0.1000 r 6 = 3.5922 d 6 = 1.8015 n 3 = 1.84666 ν 3 = 23.78 r 7 = 2.5625 d 7 = 0.4860 r 8 = 3.7333 d 8 = 2.0000 n 4 = 1.48749 ν 4 = 70.20 r 9 = -12.1472 d 9 = 4.8432 r 10 = ∞ d 10 = 4.5300 n 5 = 1.54771 ν 5 = 62.83 r 11 = ∞ d 11 = 0.8000 n 6 = 1.52420 ν 5 = 70.20 r 12 = ∞ ν 1 = 70.2, ν 2p -ν 2n = 46.42 (n 2n -n 2p) × {2 / (| r 2n | + | r 2p |)} × f = 0.989 f 1 /f=-2.83, f 2 /f=1.30

【0024】実施例6 f=7mm ,像高=4.2mm ,2ω=62°,F/8 ,像位置(最終面から)=1mm r 1 =7.4617(非球面)d 1 =1.0000 n 1 =1.48749 ν 1 =70.20 r 2 =3.3305 d 2 =3.1641 r 3 =∞ d 3 =7.0000 n 2 =1.51633 ν 2 =64.15 r 4 =∞ d 4 =1.0000 r 5 =∞(絞り) d 5 =2.4335 r 6 =13.5521 d 6 =3.5000 n 3 =1.51633 ν 3 =64.15 r 7 =-2.7701 d 7 =0.6254 n 4 =1.80518 ν 4 =25.43 r 8 =-4.4712 d 8 =8.6714 r 9 =∞ d 9 =4.5300 n 5 =1.54771 ν 5 =62.83 r 10 =∞ d 10 =0.8000 n 6 =1.52420 ν 5 =70.20 r 11 =∞ 非球面係数 P=1.0000,E=0.48566 ×10 -3 ,F=-0.84231×10 -7 G=0.12811 ×10 -5 ν 1 =70.2,ν 2p −ν 2n =38.72 (n 2n −n 2p )×{2/(|r 2n |+|r 2p |)}×f=0.628 f 1 /f=-1.92 ,f 2 /f=1.29 [0024] Example 6 f = 7 mm, the image height = 4.2mm, 2ω = 62 °, F / 8, the image position (from the last plane) = 1mm r 1 = 7.4617 (aspherical) d 1 = 1.0000 n 1 = 1.48749 ν 1 = 70.20 r 2 = 3.3305 d 2 = 3.1641 r 3 = ∞ d 3 = 7.0000 n 2 = 1.51633 ν 2 = 64.15 r 4 = ∞ d 4 = 1.0000 r 5 = ∞ ( stop) d 5 = 2.4335 r 6 = 13.5521 d 6 = 3.5000 n 3 = 1.51633 ν 3 = 64.15 r 7 = -2.7701 d 7 = 0.6254 n 4 = 1.80518 ν 4 = 25.43 r 8 = -4.4712 d 8 = 8.6714 r 9 = ∞ d 9 = 4.5300 n 5 = 1.54771 ν 5 = 62.83 r 10 = ∞ d 10 = 0.8000 n 6 = 1.52420 ν 5 = 70.20 r 11 = ∞ aspherical coefficient P = 1.0000, E = 0.48566 × 10 -3, F = -0.84231 × 10 -7 G = 0.12811 × 10 -5 ν 1 = 70.2 , ν 2p -ν 2n = 38.72 (n 2n -n 2p) × {2 / (| r 2n | + | r 2p |)} × f = 0.628 f 1 / f = - 1.92, f 2 /f=1.29

【0025】実施例7 f=7mm ,像高=4.2mm ,2ω=62°,F/8 ,像位置(最終面から)=1mm r 1 =9.4874(非球面)d 1 =1.0000 n 1 =1.48749 ν 1 =70.20 r 2 =2.8677 d 2 =3.1490 r 3 =∞ d 3 =6.7200 n 2 =1.80610 ν 2 =40.95 r 4 =∞ d 4 =1.0000 r 5 =∞(絞り) d 5 =2.3182 r 6 =6.7454 d 6 =3.5000 n 3 =1.48749 ν 3 =70.20 r 7 =-3.4453 d 7 =0.5245 r 8 =-2.9242 d 8 =0.6567 n 4 =1.80518 ν 4 =25.43 r 9 =-4.7291 d 9 =8.9583 r 10 =∞ d 10 =4.5300 n 5 =1.54771 ν 5 =62.83 r 11 =∞ d 11 =0.8000 n 6 =1.52420 ν 5 =70.20 r 12 =∞ 非球面係数 P=1.0000,E=0.11449 ×10 -2 ,F=0.12297 10 -4 G=0.12531 ×10 -5 ν 1 =70.2,ν 2p −ν 2n =44.77 (n 2n −n 2p )×{2/(|r 2n |+|r 2p |)}×f=0.909 f 1 /f=-1.27 ,f 2 /f=1.26 ただしr 1 ,r 2 ,・・・ [0025] Example 7 f = 7 mm, the image height = 4.2mm, 2ω = 62 °, F / 8, the image position (from the last plane) = 1mm r 1 = 9.4874 (aspherical) d 1 = 1.0000 n 1 = 1.48749 ν 1 = 70.20 r 2 = 2.8677 d 2 = 3.1490 r 3 = ∞ d 3 = 6.7200 n 2 = 1.80610 ν 2 = 40.95 r 4 = ∞ d 4 = 1.0000 r 5 = ∞ ( stop) d 5 = 2.3182 r 6 = 6.7454 d 6 = 3.5000 n 3 = 1.48749 ν 3 = 70.20 r 7 = -3.4453 d 7 = 0.5245 r 8 = -2.9242 d 8 = 0.6567 n 4 = 1.80518 ν 4 = 25.43 r 9 = -4.7291 d 9 = 8.9583 r 10 = ∞ d 10 = 4.5300 n 5 = 1.54771 ν 5 = 62.83 r 11 = ∞ d 11 = 0.8000 n 6 = 1.52420 ν 5 = 70.20 r 12 = ∞ aspherical coefficients P = 1.0000, E = 0.11449 × 10 -2, F = 0.12297 10 -4 G = 0.12531 × 10 -5 ν 1 = 70.2, ν 2p -ν 2n = 44.77 (n 2n -n 2p) × {2 / (| r 2n | + | r 2p |)} × f = 0.909 f 1 /f=-1.27, f 2 /f=1.26 where r 1, r 2, ··· レンズ各面の曲率半径、d The radius of curvature of each lens surface, d
1 ,d 2 ,・・・ は各レンズの肉厚、n 1 ,n 2 ,・・・ は各レンズの屈折率、ν 1 ,ν 2 ,・・・ は各レンズのアッベ数である。 1, d 2, ··· wall thickness of each lens, n 1, n 2, ··· is the refractive index of each lens, ν 1, ν 2, ··· is the Abbe number of each lens.

【0026】実施例1の撮影レンズは、図1に示す構成である。 [0026] The imaging lens of Example 1 has a structure as shown in FIG. この図1に示すように直視で使用するほか、図15に示すようにレンズ系の物体側に反射部材として反射鏡M 1を配置して斜視(斜め方向の物体の撮影)を行なう。 FIG addition to using 1 direct view as shown in, performs perspective place the reflecting mirror M 1 as a reflecting member on the object side of the lens system as shown in FIG. 15 (imaging in an oblique direction of the object). ここで反射鏡Mを可動とすれば斜視方向を変化させ得る。 Here may the perspective direction is changed if the reflection mirror M and movable. 又図16に示すように反射鏡M 1を第1群と第2群の間におくことも出来る。 A reflecting mirror M 1 as shown in Matazu 16 can also be placed between the first and second lens units. 更に図17に示すように第2群の像側に反射鏡M 1を配置することも可能である。 It is also possible to further place the reflecting mirror M 1 to the image side of the second group as shown in Figure 17.

【0027】実施例2は、図2に示すレンズ構成で、図18に示すように第1群と第2群の間に反射プリズムM [0027] Example 2 is a lens configuration shown in FIG. 2, the reflection between the first group and the second group as shown in FIG. 18 prism M
2を配置して使用することを想定している。 It is intended to be used to place 2. 図2の符号M 2もこのプリズムを示し、データー中のr 3 ,r 4 Figure sign M 2 2 also shows this prism, r 3, r 4 in data,
3 ,n 2 ,ν 2がこのプリズムを示している。 d 3, n 2, ν 2 indicates a prism.

【0028】実施例3乃至実施例7は夫々図3乃至図7 [0028] Example 3 to Example 7, respectively FIGS. 3-7
に示すもので、これら実施例も実施例2と同様に図18 Shows in the same manner these examples also Example 2 FIG. 18
のようにプリズムを配置することを想定している。 It is assumed that placing the prism as.

【0029】本発明の実施例で用いられる非球面は、光軸方向をx軸、x軸に直角な方向をy軸とした時、次の式で表わされる。 The aspherical surface used in the examples of the present invention, the optical axis x-axis, when the direction perpendicular to the x-axis and the y-axis, is expressed by the following equation.

【0030】ただしC=1/r(rは非球面の面頂の曲率半径)、Pは円錐定数、E,F,G,・・・は非球面係数である。 [0030] However C = 1 / r (r is the radius of curvature of the vertex of the aspherical surface), P is a conical constant, E, F, G, ··· are aspherical coefficients.

【0031】尚図中Fはフィルターである。 [0031] Naozu in F is a filter. 又反射部材として、ダハミラー、ダハプリズムを用いてもよい。 Also as a reflective member, the roof mirrors, may be used roof prism.

【0032】本発明の各実施例はFナンバーが5.6〜 [0032] Each embodiment of the present invention is the F-number is 5.6 to
8程度と大きく、そのため被写界深度が深く無限遠程度の遠方から車体近くまで鮮明な画像が得られる。 As large as about 8, clear images are obtained therefore from distant deep infinity about depth of field to the vehicle body close. 又絞り径を固定にすれば駆動機構を省略でき、鏡枠が簡単になり小型化が可能である。 The optional drive mechanism if the stop diameter is fixed, it is possible to miniaturize simplifies the lens frame.

【0033】 [0033]

【発明の効果】本発明の撮影レンズは、3枚の少ない枚数であるにもかかわらず倍率の色収差をはじめ諸収差が良好に補正され車載カメラ用として好適なレンズ系である。 Imaging lens of the present invention exhibits a three a small number is nevertheless beginning aberrations lateral chromatic aberration of are favorably corrected suitable lens system for the vehicle camera.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の実施例1の断面図 Sectional view of an embodiment 1 of the present invention

【図2】本発明の実施例2の断面図 Sectional view of a second embodiment of the present invention; FIG

【図3】本発明の実施例3の断面図 Sectional view of the third embodiment of the present invention; FIG

【図4】本発明の実施例4の断面図 Sectional view of an embodiment 4 of the present invention; FIG

【図5】本発明の実施例5の断面図 Figure 5 is a cross-sectional view of a fifth embodiment of the present invention

【図6】本発明の実施例6の断面図 6 is a cross-sectional view of a sixth embodiment of the present invention

【図7】本発明の実施例7の断面図 7 is a cross-sectional view of a seventh embodiment of the present invention

【図8】本発明の実施例1の収差曲線図 [8] the aberration curves of the first embodiment of the present invention

【図9】本発明の実施例2の収差曲線図 [9] aberration curves of Example 2 of the present invention

【図10】本発明の実施例3の収差曲線図 [10] aberration curves of Example 3 of the present invention

【図11】本発明の実施例4の収差曲線図 [11] aberration curves of Example 4 of the present invention

【図12】本発明の実施例5の収差曲線図 Aberration curves of Example 5 of the present invention; FIG

【図13】本発明の実施例6の収差曲線図 [13] aberration curves of Example 6 of the present invention

【図14】本発明の実施例7の収差曲線図 [14] aberration curves of Example 7 of the present invention

【図15】本発明のレンズ系の物体側に反射部材を配置した構成を示す図 Figure 15 shows a structure of arranging a reflecting member on the object side of the lens system of the present invention

【図16】本発明のレンズ系の第1群と第2群の間に反射部材を配置した構成を示す図 FIG. 16 shows a structure of arranging a reflecting member between the lens system the first group and the second group of the present invention

【図17】本発明のレンズ系の第2群の像側に反射部材を配置した構成を示す図 FIG. 17 shows a structure of arranging a reflecting member on the image side of the lens system a second group of the present invention

【図18】本発明のレンズ系の第1群と第2群の間に反射プリズムを配置した構成を示す図 FIG. 18 shows a structure of arranging the reflecting prism between the first and second groups lens system of the present invention

───────────────────────────────────────────────────── ────────────────────────────────────────────────── ───

【手続補正書】 [Procedure amendment]

【提出日】平成5年8月13日 [Filing date] 1993 August 13

【手続補正1】 [Amendment 1]

【補正対象書類名】明細書 [Correction target document name] specification

【補正対象項目名】0003 [Correction target item name] 0003

【補正方法】変更 [Correction method] change

【補正内容】 [Correction contents]

【0003】 [0003]

【発明が解決しようとする課題】前記従来例のうち特開平2−7712号および特開平2−208617号公報の実施例5のレンズ系は、ともに構成枚数が少ないがそのために色収差特に倍率の色収差が補正不足ぎみである。 [0007] lens system of Example 5 of JP-A-2-7712 and No. Hei 2-208617 discloses one of the conventional example, but together constitute a small number chromatic aberration of chromatic aberration, especially the magnification for the There is a correction scarce. これらは物体側から順に絞りを挟んで負,正のパワー配置のレンズ系で、広角化にとって有利であり又バックフォーカスを確保しやすいタイプになっている。 These negative across the aperture from the object side, a positive power arrangement of the lens system, has become easier type to ensure advantageous and also back focus for a wider angle. しかし絞りに対して非対称なパワー配置であるために、歪曲収差や倍率の色収差が補正不足になりやすい。 However, because of the asymmetrical power distribution with respect to the diaphragm, chromatic distortion and magnification tends to become under-corrected.

【手続補正2】 [Amendment 2]

【補正対象書類名】明細書 [Correction target document name] specification

【補正対象項目名】0007 [Correction target item name] 0007

【補正方法】変更 [Correction method] change

【補正内容】 [Correction contents]

【0007】車載カメラ用レンズは、無限遠程度の遠景から車体付近までの広い範囲を同時にピントがあった状態にて観察し得る必要性がある。 [0007] Lens-vehicle camera, there is a need to be observed from an infinite degree of distant view in a state where there is simultaneously focus a wide range up to the vicinity of the vehicle body. そのためには、広い To this end, wide-be
界深度を持つレンズ系であることが望まれる。 It is desired that a lens system having a depth of field. 又一般の監視カメラは、主として屋内や夜間等の比較的暗い場所で使用されることが多いが、車載カメラは、屋外で使用されしかも日中における使用頻度が高い。 The general monitoring cameras, primarily but indoors or is often used in a relatively dark place such as at night, the vehicle-mounted camera, is frequently used in used Moreover daytime outdoors. したがって車載カメラはFナンバーが大であっても良く、そのため、レンズ枚数の削減にとって有利である。 Therefore vehicle camera may be a F-number is large, therefore, it is advantageous for reducing the number of lenses.

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】物体側より順に、負の屈折力の第1群と、 In order from 1. A object side, a first lens unit of negative refractive power,
    正の屈折力の第2群よりなり、第1群が1枚の負レンズのみで構成され、第2群が負正又は正負の順に配置された負のメニスカスレンズと両凸レンズの2枚のレンズで構成されているレンズ系で、下記条件(1),(2), Made from the second group of positive refractive power, the first group consists of only one negative lens, the second group of negative, positive or two lenses of positive and negative negative meniscus lens and a biconvex lens arranged in this order in a lens system that is configured, the following conditions (1), (2),
    (3)を満足する撮影レンズ。 Taking lens that satisfies the (3). (1) ν 1 >40 (2) ν 2p −ν 2n >10 (3) (n 2n −n 2p )×{2/(|r 2n |+|r 2p (1) ν 1> 40 ( 2) ν 2p -ν 2n> 10 (3) (n 2n -n 2p) × {2 / (| r 2n | + | r 2p
    |)}×f>0.48 ただしν 1は第1群の負レンズのアッベ数、ν 2p ,ν |)} × f> 0.48, however [nu 1 Abbe number of the negative lens in the first lens group, ν 2p, ν
    2nは夫々第2群の正レンズおよび負レンズのアッベ数、n 2p ,n 2nは夫々第2群の正レンズおよび負レンズの屈折率、r 2p ,r 2nは夫々第2群の正レンズと負レンズの互いに向かい合う面の曲率半径(接合レンズの場合は接合面の曲率半径であってr 2p =r 2n )、f 2n is the Abbe number of each positive lens and the negative lens in the second group, and n 2p, n 2n are each refractive index of the positive lens and the negative lens in the second group, r 2p, r 2n are each positive lens of the second group the radius of curvature of each other facing surface of the negative lens (r 2p = r 2n a radius of curvature of the cemented surface in the case of the cemented lens), f
    は全系の焦点距離である。 Is the focal length of the entire system.
JP31444592A 1992-10-30 1992-10-30 The taking lens Expired - Fee Related JP3324802B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP31444592A JP3324802B2 (en) 1992-10-30 1992-10-30 The taking lens

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP31444592A JP3324802B2 (en) 1992-10-30 1992-10-30 The taking lens
US08124592 US5448319A (en) 1992-09-22 1993-09-21 Optical system for monitor cameras to be mounted on vehicles
US08418456 US5648835A (en) 1992-09-22 1995-04-07 Optical system for monitor cameras to be mounted on vehicles

Publications (2)

Publication Number Publication Date
JPH06148518A true true JPH06148518A (en) 1994-05-27
JP3324802B2 JP3324802B2 (en) 2002-09-17

Family

ID=18053447

Family Applications (1)

Application Number Title Priority Date Filing Date
JP31444592A Expired - Fee Related JP3324802B2 (en) 1992-10-30 1992-10-30 The taking lens

Country Status (1)

Country Link
JP (1) JP3324802B2 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5774279A (en) * 1995-10-19 1998-06-30 Konica Corporation Retrofoucus photographic lens
US5822128A (en) * 1996-03-22 1998-10-13 Nikon Corporation Projection lenses for display elements and projection systems comprising same
US5822129A (en) * 1995-11-07 1998-10-13 Nikon Corporation Projection lens system
JP2002131633A (en) * 2000-10-24 2002-05-09 Asahi Optical Co Ltd Objective lens for endoscope
US6980369B2 (en) 2003-03-10 2005-12-27 Nidec Copal Corporation Zoom lens
US6995923B2 (en) 2003-06-30 2006-02-07 Fujinon Corporation Small lightweight zoom lens
JP2010091620A (en) * 2008-10-03 2010-04-22 Sony Corp Lens unit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5774279A (en) * 1995-10-19 1998-06-30 Konica Corporation Retrofoucus photographic lens
US5822129A (en) * 1995-11-07 1998-10-13 Nikon Corporation Projection lens system
US5822128A (en) * 1996-03-22 1998-10-13 Nikon Corporation Projection lenses for display elements and projection systems comprising same
JP2002131633A (en) * 2000-10-24 2002-05-09 Asahi Optical Co Ltd Objective lens for endoscope
US6980369B2 (en) 2003-03-10 2005-12-27 Nidec Copal Corporation Zoom lens
US6995923B2 (en) 2003-06-30 2006-02-07 Fujinon Corporation Small lightweight zoom lens
JP2010091620A (en) * 2008-10-03 2010-04-22 Sony Corp Lens unit

Also Published As

Publication number Publication date Type
JP3324802B2 (en) 2002-09-17 grant

Similar Documents

Publication Publication Date Title
US6025962A (en) Zoom lens with an anti-vibration function
US6016229A (en) Wide-angle lens
US5654826A (en) Zoom lens system having a vibration reduction function
US6169635B1 (en) Zoom lens system
US5946144A (en) Wide-angle lens
JP2006084829A (en) Zoom lens and imaging apparatus having the same
US5706141A (en) Photographing lens
JPH085913A (en) Rear focus type zoom lens
JP2006065034A (en) Zoom lens and imaging apparatus having the same
JP2006259704A (en) Wide angle imaging lens
US6333815B1 (en) Real image mode variable magnification finder
JPH05273459A (en) Fisheye lens equipped with short-distance correcting function
JPH1152227A (en) Photographing lens
US7663814B2 (en) Imaging lens system and imaging apparatus
US5999337A (en) Lens system for electronic photography
US7075733B2 (en) Zoom lens system and image pickup apparatus including the same
JP2001242378A (en) Three-group zoom lens
US5539581A (en) Zoom lens system
US7492524B2 (en) Zoom lens system, imaging apparatus, method for vibration reduction, and method for varying focal length
US6646814B2 (en) Zoom lens, and image pickup device using the same
JPH10186235A (en) Projection-use zoom lens
US6692163B2 (en) Single-lens reflex camera provided with eyepiece
JP2010152147A (en) Zoom lens system, image capturing apparatus, and camera
JPH0694997A (en) High variable power and wide angle zoom lens
US5579160A (en) Optical system capable of correcting image position

Legal Events

Date Code Title Description
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20020611

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080705

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090705

Year of fee payment: 7

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100705

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100705

Year of fee payment: 8

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110705

Year of fee payment: 9

LAPS Cancellation because of no payment of annual fees