JPH06148518A - Photographic lens - Google Patents
Photographic lensInfo
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- JPH06148518A JPH06148518A JP4314445A JP31444592A JPH06148518A JP H06148518 A JPH06148518 A JP H06148518A JP 4314445 A JP4314445 A JP 4314445A JP 31444592 A JP31444592 A JP 31444592A JP H06148518 A JPH06148518 A JP H06148518A
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Abstract
Description
【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。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing lens used for a vehicle-mounted camera or the like.
【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。この撮影レンズは、構成レンズ枚数が8枚と多い。
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。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。2. Description of the Related Art As a taking lens for an on-vehicle camera, for example, there is one described in JP-A-3-321213. This photographic lens has a large number of constituent lenses of eight.
As a lens system for a video camera having a small number of constituent lenses, for example, there is a lens system described in JP-A-2-7712 and a lens system described as a fifth embodiment in JP-A-2-208617. Of these lens systems, the former lens system is composed of two lenses, and the latter lens system is composed of 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。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。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。Among the above-mentioned conventional examples, the lens systems of Example 2 of JP-A-2-7712 and JP-A-2-208617 have a small number of constituent elements, but chromatic aberration, especially chromatic aberration of magnification. Is undercorrected. These are lens systems in which negative and positive powers are arranged with the diaphragm in order from the object side, which is advantageous for widening the angle and is a type that can easily secure the back focus. However, since the power distribution is asymmetric with respect to the diaphragm, distortion and chromatic aberration of magnification tend to be insufficiently 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。A lens for an on-vehicle camera has a wider allowable range in terms of distortion than a photographic lens, so that it does not pose a problem, but it is necessary to sufficiently correct lateral chromatic aberration.
【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。An object of the present invention is to provide a photographic lens suitable for a vehicle-mounted camera lens in which various aberrations such as chromatic aberration of magnification are favorably corrected although the number of lenses is small.
【0006】[0006]
【課題を解決するための手段】本発明の撮影レンズは、
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。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。 (1) ν1 >40 (2) ν2p−ν2n>10 (3) (n2n−n2p)×{2/(|r2n|+|r2p
|)}×f>0.48 ただしν1 は第1群の負レンズのアッベ数、ν2p ,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、n2p ,n2nは夫々
第2群の正レンズ,負レンズの屈折率、r2p ,r2n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r2p=r2n)、fは全系の焦点距離である。The taking lens of the present invention comprises:
In order from the object side, a first group having negative refracting power and a second group having positive refracting power are included. The first group consists of only one negative lens, and the second group consists of one negative meniscus. It is composed of two lenses, a lens and one biconvex lens. This lens system satisfies the following conditions (1), (2) and (3). (1) ν 1 > 40 (2) ν 2p −ν 2n > 10 (3) (n 2n −n 2p ) × {2 / (│r 2n │ + │r 2p
│)} × f> 0.48 where ν 1 is the Abbe number of the negative lens of the first group, ν 2p , ν
2n are the Abbe numbers of the positive lens and the negative lens (the biconvex lens and the negative meniscus lens) of the second group, respectively, and n 2p and n 2n are the refractive indices of the positive lens and the negative lens of the second group, r 2p and r 2n, respectively. Is the radius of curvature of the surfaces of the positive and negative lenses of the second lens group facing each other (in the case of a cemented lens, the radius of curvature of the cemented surface, r 2p = r 2n ), and 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。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。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。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。The on-vehicle camera lens needs to be capable of observing a wide range from a distant view of infinity to the vicinity of the vehicle body in a focused state at the same time. For that purpose, it is desired that the lens system has a wide depth of field. In addition, general surveillance cameras are often used mainly in relatively dark places such as indoors and at night, but in-vehicle cameras are used outdoors and are frequently used during the daytime. Therefore, the in-vehicle camera may have a large F number, which 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。From the above, the taking lens of the present invention has the above-mentioned lens structure.
【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。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。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。In the case of the type such as the lens system of the present invention described above, in order to minimize the number of lenses, the first group is composed of one negative lens and the second group is composed of one positive lens. However, in order to correct the chromatic aberration of magnification, it is necessary to add at least one more lens. In that case, it is most effective to add one negative lens to the second lens group. Further, it is preferable that the above-mentioned conditions (1), (2) and (3) are satisfied.
【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。The conditions (1) and (2) are conditions for suppressing the occurrence of chromatic aberration in each group and favorably correcting the 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。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。If the condition (1) is not satisfied, lateral chromatic aberration will be undercorrected. If the range of the condition (2) is exceeded, the chromatic aberration of magnification and the axial chromatic aberration will be insufficiently corrected.
【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、
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。The condition (3) defines the refracting power of the surfaces of the positive and negative lenses of the second lens group which face each other,
If the range of the condition (3) is exceeded, correction of spherical aberration and coma will be insufficient.
【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。The second lens group may be a negative lens, a positive lens, a positive lens, or a negative lens in order from the object side.
【0014】本発明の撮影レンズにおいて、更に第1
群、第2群が次の条件(4),(5)を満足すれば一層
好ましい。 (4) −4<f1 /f<−0.95 (5) 0.85<f2 /f<2 ただし、f1 ,f2 は夫々第1群、第2群の焦点距離で
ある。In the taking lens of the present invention, the first
It is more preferable that the second group and the second group satisfy the following conditions (4) and (5). (4) −4 <f 1 /f<−0.95 (5) 0.85 <f 2 / f <2 where f 1 and f 2 are focal lengths of the first group and the second group, respectively.
【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。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。又
ペッツバール和が正の大きな値になりやすい。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。The conditions (4) and (5) are mainly conditions for further downsizing the lens system, and specify the refracting powers of both groups, respectively. When the value goes below the lower limit of the condition (4) or the condition (5), it becomes disadvantageous in securing the back focus, and it becomes difficult to dispose an optical material such as a filter. Moreover, the Petzval sum tends to have a large positive value. On the contrary, if the upper limit of the condition (4) or the condition (5) is exceeded, it is preferable for ensuring the back focus, but the total length tends to be large.
【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。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。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。Furthermore, it is desirable to provide the first lens unit with an aspherical surface whose negative refracting power becomes weaker as the optical axis moves away. In the in-vehicle camera lens system, the image distortion is neglected compared to the sharpness of the image, but it is desirable that the distortion aberration is corrected in order to confirm the visual field more accurately and safely. It is effective to use the aspherical surface as described above for the first lens group, and thereby the distortion aberration can be satisfactorily corrected.
【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。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。
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。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。Further, the vehicle-mounted camera needs an optical system which is directed sideways or obliquely depending on the positional relationship with the vehicle body. Therefore, in the lens system of the present invention, a reflecting member such as a prism or a mirror can be arranged between the first group and the second group, which allows a side view or a perspective view.
The off-axis ray height is low between the first group and the second group of the lens system of the present invention, and when a prism or a reflecting member is arranged there, these members can be made small, which is advantageous in downsizing the entire optical system. Is. However, the position of the reflecting member may be arranged on the object side of the first group or on the image side of the second 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。The photographic lens of the present invention can be used as a lens system for general video cameras and silver halide cameras as well as for vehicle-mounted cameras.
【0019】[0019]
【実施例】次に本発明の撮影レンズの各実施例を示す。 実施例1 f=7mm ,像高=4.2mm ,2ω=62°,F/8 ,像位置(最終面から)=1mm r1 =18.6732 d1 =1.0000 n1 =1.48749 ν1 =70.20 r2 =3.7831(非球面)d2 =9.5367 r3 =∞(絞り) d3 =0.7164 r4 =5.0314 d4 =2.4019 n2 =1.84666 ν2 =23.78 r5 =2.7656 d5 =3.6106 n3 =1.48749 ν3 =70.20 r6 =-6.4383 d6 =7.1787 r7 =∞ d7 =4.5300 n4 =1.54771 ν4 =62.83 r8 =∞ d8 =0.8000 n5 =1.52420 ν5 =70.20 r9 =∞ 非球面係数 P=1.0000,E=-0.99376×10-3,F=0.11082 ×10-4 G=-0.10100×10-4 ν1 =70.2,ν2p−ν2n=46.42 (n2n−n2p)×{2/(|r2n|+|r2p|)}×f=0.698 f1 /f=-1.42 ,f2 /f=1.26EXAMPLES Next, examples of the taking lens of the present invention will be shown. Example 1 f = 7 mm, image height = 4.2 mm, 2ω = 62 °, F / 8, image position (from final surface) = 1 mm r 1 = 18.6732 d 1 = 1.0000 n 1 = 1.48749 ν 1 = 70.20 r 2 = 3.7831 (aspherical surface) d 2 = 9.5367 r 3 = ∞ (aperture) 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 = ∞ aspherical coefficient 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 r1 =7.6583(非球面)d1 =1.1242 n1 =1.48749 ν1 =70.20 r2 =3.3410 d2 =3.3199 r3 =∞ d3 =6.8000 n2 =1.51633 ν2 =64.15 r4 =∞ d4 =1.0000 r5 =∞(絞り) d5 =0.6968 r6 =6.1028 d6 =2.6923 n3 =1.80518 ν3 =25.43 r7 =2.2505 d7 =2.4463 n4 =1.60342 ν4 =38.01 r8 =-6.7210 (非球面)d8 =5.5492 r9 =∞ d9 =4.5300 n5 =1.54771 ν5 =62.83 r10=∞ d10=0.8000 n6 =1.52420 ν5 =70.20 r11=∞ 非球面係数 (第1面)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
9291×10-3 G=-0.51452×10-4 ν1 =70.2,ν2p−ν2n=12.58 (n2n−n2p)×{2/(|r2n|+|r2p|)}×f=0.730 f1 /f=-1.90 ,f2 /f=1.15Example 2 f = 7 mm, image height = 4.2 mm, 2ω = 62 °, F / 8, image position (from final surface) = 1 mm r 1 = 7.6583 (aspherical surface) 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 = ∞ (diaphragm) 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 coefficient (first surface) P = 1.0000, E = 0.57683 × 10 -3 , F = 0.13
353 x 10 -4 G = 0.61032 x 10 -6 (8th surface) P = 1.0000, E = -0.7060 10 x 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
【0021】実施例3 f=7mm ,像高=4.2mm ,2ω=62°,F/8 ,像位置(最終面から)=1mm r1 =16.4159 d1 =1.0000 n1 =1.54814 ν1 =45.78 r2 =5.4595 d2 =7.5840 r3 =∞ d3 =6.7200 n2 =1.80610 ν2 =40.95 r4 =∞ d4 =1.0000 r5 =∞(絞り) d5 =0.3187 r6 =4.1585 d6 =1.8069 n3 =1.84666 ν3 =23.78 r7 =2.3370 d7 =1.9711 n4 =1.51633 ν4 =64.15 r8 =-13.2147 d8 =5.2588 r9 =∞ d9 =4.5300 n5 =1.54771 ν5 =62.83 r10=∞ d10=0.8000 n6 =1.52420 ν5 =70.20 r11=∞ ν1 =45.78 ,ν2p−ν2n=40.37 (n2n−n2p)×{2/(|r2n|+|r2p|)}×f=0.799 f1 /f=-2.20 ,f2 /f=1.22Example 3 f = 7 mm, image height = 4.2 mm, 2ω = 62 °, F / 8, image position (from final surface) = 1 mm 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 = ∞ (aperture) d 5 = 0.3187 r 6 = 4.1585 d 6 = 1.8069 n 3 = 1.84666 v 3 = 23.78 r 7 = 2.3370 d 7 = 1.9711 n 4 = 1.51633 v 4 = 64.15 r 8 = -13.2147 d 8 = 5.2588 r 9 = ∞ d 9 = 4.5300 n 5 = 1.54771 v 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 r1 =12.6075 (非球面)d1 =0.9327 n1 =1.48749 ν1 =70.20 r2 =3.2614 d2 =3.4950 r3 =∞ d3 =6.7200 n2 =1.51633 ν2 =64.15 r4 =∞ d4 =1.0000 r5 =∞(絞り) d5 =1.3995 r6 =5.6433 d6 =2.0240 n3 =1.80518 ν3 =25.43 r7 =3.0491 d7 =2.5272 n4 =1.48749 ν4 =70.20 r8 =-6.1979 (非球面)d8 =8.6927 r9 =∞ d9 =4.5300 n5 =1.54771 ν5 =62.83 r10=∞ d10=0.8000 n6 =1.52420 ν5 =70.20 r11=∞ 非球面係数 (第1面)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
8453×10-4 G=-0.69306×10-5 ν1 =70.2,ν2p−ν2n=44.77 (n2n−n2p)×{2/(|r2n|+|r2p|)}×f=0.729 f1 /f=-1.33 ,f2 /f=1.26Example 4 f = 7 mm, image height = 4.2 mm, 2ω = 62 °, F / 5.6 image position (from final surface) = 1 mm r 1 = 1.6075 (aspherical surface) 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 = ∞ (aperture) 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 = ∞ aspheric coefficient (first surface) P = 1.0000, E = 0.95419 × 10 -3 , F = 0.46
297 × 10 -5 G = 0.40011 × 10 -6 (8th surface) 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
【0023】実施例5 f=7mm ,像高=4.2mm ,2ω=62°,F/8 ,像位置(最終面から)=1mm r1 =16.4817 d1 =1.0000 n1 =1.48749 ν1 =70.20 r2 =5.9725 d2 =9.6315 r3 =∞ d3 =7.0000 n2 =1.51633 ν2 =64.15 r4 =∞ d4 =1.0000 r5 =∞(絞り) d5 =0.1000 r6 =3.5922 d6 =1.8015 n3 =1.84666 ν3 =23.78 r7 =2.5625 d7 =0.4860 r8 =3.7333 d8 =2.0000 n4 =1.48749 ν4 =70.20 r9 =-12.1472 d9 =4.8432 r10=∞ d10=4.5300 n5 =1.54771 ν5 =62.83 r11=∞ d11=0.8000 n6 =1.52420 ν5 =70.20 r12=∞ ν1 =70.2,ν2p−ν2n=46.42 (n2n−n2p)×{2/(|r2n|+|r2p|)}×f=0.989 f1 /f=-2.83 ,f2 /f=1.30Example 5 f = 7 mm, image height = 4.2 mm, 2ω = 62 °, F / 8, image position (from the final surface) = 1 mm 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 = ∞ (aperture) 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 = 0.8989 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 r1 =7.4617(非球面)d1 =1.0000 n1 =1.48749 ν1 =70.20 r2 =3.3305 d2 =3.1641 r3 =∞ d3 =7.0000 n2 =1.51633 ν2 =64.15 r4 =∞ d4 =1.0000 r5 =∞(絞り) d5 =2.4335 r6 =13.5521 d6 =3.5000 n3 =1.51633 ν3 =64.15 r7 =-2.7701 d7 =0.6254 n4 =1.80518 ν4 =25.43 r8 =-4.4712 d8 =8.6714 r9 =∞ d9 =4.5300 n5 =1.54771 ν5 =62.83 r10=∞ d10=0.8000 n6 =1.52420 ν5 =70.20 r11=∞ 非球面係数 P=1.0000,E=0.48566 ×10-3,F=-0.84231×10-7 G=0.12811 ×10-5 ν1 =70.2,ν2p−ν2n=38.72 (n2n−n2p)×{2/(|r2n|+|r2p|)}×f=0.628 f1 /f=-1.92 ,f2 /f=1.29Example 6 f = 7 mm, image height = 4.2 mm, 2ω = 62 °, F / 8, image position (from final surface) = 1 mm r 1 = 7.4617 (aspherical surface) 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 = ∞ (aperture) 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 r1 =9.4874(非球面)d1 =1.0000 n1 =1.48749 ν1 =70.20 r2 =2.8677 d2 =3.1490 r3 =∞ d3 =6.7200 n2 =1.80610 ν2 =40.95 r4 =∞ d4 =1.0000 r5 =∞(絞り) d5 =2.3182 r6 =6.7454 d6 =3.5000 n3 =1.48749 ν3 =70.20 r7 =-3.4453 d7 =0.5245 r8 =-2.9242 d8 =0.6567 n4 =1.80518 ν4 =25.43 r9 =-4.7291 d9 =8.9583 r10=∞ d10=4.5300 n5 =1.54771 ν5 =62.83 r11=∞ d11=0.8000 n6 =1.52420 ν5 =70.20 r12=∞ 非球面係数 P=1.0000,E=0.11449 ×10-2,F=0.12297 10-4 G=0.12531 ×10-5 ν1 =70.2,ν2p−ν2n=44.77 (n2n−n2p)×{2/(|r2n|+|r2p|)}×f=0.909 f1 /f=-1.27 ,f2 /f=1.26 ただしr1 ,r2 ,・・・ はレンズ各面の曲率半径、d
1 ,d2 ,・・・ は各レンズの肉厚、n1 ,n2 ,・・・ は
各レンズの屈折率、ν1 ,ν2 ,・・・ は各レンズのアッ
ベ数である。Example 7 f = 7 mm, image height = 4.2 mm, 2ω = 62 °, F / 8, image position (from final surface) = 1 mm r 1 = 9.4874 (aspherical surface) 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 = ∞ (diaphragm) 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 coefficient 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, ··· The radius of curvature of each lens surface, d
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。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M1を配置して斜視(斜め方向の物体の撮影)を行
なう。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。又図16に示すように反射鏡M1を第1群と第
2群の間におくことも出来る。更に図17に示すように
第2群の像側に反射鏡M1を配置することも可能であ
る。The taking lens of Example 1 has the configuration shown in FIG. In addition to being used in a direct view as shown in FIG. 1, a reflecting mirror M 1 is arranged as a reflecting member on the object side of the lens system as shown in FIG. 15 to perform a perspective view (imaging an object in an oblique direction). Here, if the reflecting mirror M is movable, the direction of the perspective can be changed. Further, as shown in FIG. 16, the reflecting mirror M 1 can be placed between the first group and the second group. Further, as shown in FIG. 17, it is possible to dispose the reflecting mirror M 1 on the image side of the second group.
【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
2を配置して使用することを想定している。図2の符号
M2もこのプリズムを示し、データー中のr3 ,r4 ,
d3 ,n2 ,ν2 がこのプリズムを示している。The second embodiment has the lens structure shown in FIG. 2, and a reflecting prism M is provided between the first group and the second group as shown in FIG.
It is assumed that 2 will be placed and used. Reference numeral M 2 in FIG. 2 also indicates this prism, and r 3 , r 4 , and
d 3 , n 2 and ν 2 indicate this prism.
【0028】実施例3乃至実施例7は夫々図3乃至図7
に示すもので、これら実施例も実施例2と同様に図18
のようにプリズムを配置することを想定している。Embodiments 3 to 7 are shown in FIGS. 3 to 7, respectively.
18 is similar to that of the second embodiment.
It is assumed that the prism is arranged as shown in.
【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 embodiments of the present invention is expressed by the following equation, where the optical axis direction is the x axis and the direction perpendicular to the x axis is the y axis.
【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。However, C = 1 / r (r is the radius of curvature of the apex of the aspherical surface), P is a conical constant, and E, F, G, ... Are aspherical surface coefficients.
【0031】尚図中Fはフィルターである。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。In the figure, F is a filter. A Dach mirror or Dach prism may be used as the reflecting member.
【0032】本発明の各実施例はFナンバーが5.6〜
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。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。In each embodiment of the present invention, the F number is 5.6 to.
It is as large as about 8 and therefore has a deep depth of field and a clear image can be obtained from a distance of about infinity to the vicinity of the vehicle body. If the diaphragm diameter is fixed, the drive mechanism can be omitted, the lens frame can be simplified, and the size can be reduced.
【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。The taking lens of the present invention is a lens system suitable for an on-vehicle camera, in which various aberrations such as chromatic aberration of magnification are well corrected despite the small number of three lenses.
【図1】本発明の実施例1の断面図FIG. 1 is a sectional view of a first embodiment of the present invention.
【図2】本発明の実施例2の断面図FIG. 2 is a sectional view of a second embodiment of the present invention.
【図3】本発明の実施例3の断面図FIG. 3 is a sectional view of a third embodiment of the present invention.
【図4】本発明の実施例4の断面図FIG. 4 is a sectional view of a fourth embodiment of the present invention.
【図5】本発明の実施例5の断面図FIG. 5 is a sectional view of a fifth embodiment of the present invention.
【図6】本発明の実施例6の断面図FIG. 6 is a sectional view of a sixth embodiment of the present invention.
【図7】本発明の実施例7の断面図FIG. 7 is a 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FIG. 8 is an aberration curve diagram of Example 1 of the present invention.
【図9】本発明の実施例2の収差曲線図FIG. 9 is an aberration curve diagram of Example 2 of the present invention.
【図10】本発明の実施例3の収差曲線図FIG. 10 is an aberration curve diagram of Example 3 of the present invention.
【図11】本発明の実施例4の収差曲線図FIG. 11 is an aberration curve diagram of Example 4 of the present invention.
【図12】本発明の実施例5の収差曲線図FIG. 12 is an aberration curve diagram of Example 5 of the present invention.
【図13】本発明の実施例6の収差曲線図FIG. 13 is an aberration curve diagram for Example 6 of the present invention.
【図14】本発明の実施例7の収差曲線図FIG. 14 is an aberration curve diagram 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FIG. 15 is a diagram showing a configuration in which a reflecting member is arranged 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 is a diagram showing a configuration in which a reflecting member is arranged between the first group and the second group of the lens system 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 is a diagram showing a configuration in which a reflecting member is arranged on the image side of the second group of the lens system 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 is a diagram showing a configuration in which a reflecting prism is arranged between the first group and the second group of the lens system of the present invention.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成5年8月13日[Submission date] August 13, 1993
【手続補正1】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】0003[Name of item to be corrected] 0003
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【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。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。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。Among the above-mentioned conventional examples, the lens systems of Example 5 of JP-A-2-7712 and JP-A-2-208617 both have a small number of constituent elements, but chromatic aberration, especially chromatic aberration of magnification, is therefore small. Is undercorrected. These are lens systems in which negative and positive powers are arranged with the diaphragm in order from the object side, which is advantageous for widening the angle and is a type that can easily secure the back focus. However, since the power distribution is asymmetric with respect to the diaphragm, distortion and chromatic aberration of magnification tend to be insufficiently corrected.
【手続補正2】[Procedure Amendment 2]
【補正対象書類名】明細書[Document name to be amended] Statement
【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 content]
【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。そのためには、広い被
写界深度を持つレンズ系であることが望まれる。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。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。The on-vehicle camera lens needs to be capable of observing a wide range from a distant view of infinity to the vicinity of the vehicle body in a focused state at the same time. To this end, wide-be
It is desired that a lens system having a depth of field. In addition, general surveillance cameras are often used mainly in relatively dark places such as indoors and at night, but in-vehicle cameras are used outdoors and are frequently used during the daytime. Therefore, the in-vehicle camera may have a large F number, which is advantageous for reducing the number of lenses.
Claims (1)
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),
(3)を満足する撮影レンズ。 (1) ν1 >40 (2) ν2p−ν2n>10 (3) (n2n−n2p)×{2/(|r2n|+|r2p
|)}×f>0.48 ただしν1 は第1群の負レンズのアッベ数、ν2p ,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、n2p ,n2n は夫々第2群の正レンズおよび負レ
ンズの屈折率、r2p ,r2n 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r2p=r2n)、f
は全系の焦点距離である。1. A first group having negative refractive power in order from the object side,
Two lenses, a negative meniscus lens and a biconvex lens, each of which includes a second lens unit having a positive refractive power, the first lens unit is composed of only one negative lens, and the second lens unit is arranged in the order of negative positive or positive and negative. A lens system composed of the following conditions (1), (2),
A photographic lens that satisfies (3). (1) ν 1 > 40 (2) ν 2p −ν 2n > 10 (3) (n 2n −n 2p ) × {2 / (│r 2n │ + │r 2p
│)} × f> 0.48 where ν 1 is the Abbe number of the negative lens of the first group, ν 2p , ν
2n are the Abbe numbers of the positive and negative lenses of the second group, n 2p and n 2n are the refractive indices of the positive and negative lenses of the second group, and r 2p and r 2n are the positive lenses of the second group, respectively. The radius of curvature of the surfaces of the negative lens facing each other (in the case of a cemented lens, the radius of curvature of the cemented surface, r 2p = r 2n ), f
Is the focal length of the entire system.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31444592A JP3324802B2 (en) | 1992-10-30 | 1992-10-30 | Shooting lens |
US08/124,592 US5448319A (en) | 1992-09-22 | 1993-09-21 | Optical system for monitor cameras to be mounted on vehicles |
US08/418,456 US5648835A (en) | 1992-09-22 | 1995-04-07 | Optical system for monitor cameras to be mounted on vehicles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP31444592A JP3324802B2 (en) | 1992-10-30 | 1992-10-30 | Shooting lens |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06148518A 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) | 1992-09-22 | 1992-10-30 | Shooting lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3324802B2 (en) |
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JPH08220429A (en) * | 1995-02-17 | 1996-08-30 | Casio Comput Co Ltd | Wide angle lens |
JPH0921947A (en) * | 1995-07-07 | 1997-01-21 | Nikon Corp | Ultrawide angle lens |
JPH09503600A (en) * | 1994-07-25 | 1997-04-08 | フィリップス エレクトロニクス ネムローゼ フェンノートシャップ | Wide-angle objective lens system |
JPH10115777A (en) * | 1996-10-11 | 1998-05-06 | Olympus Optical Co Ltd | Photographic lens |
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 |
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JP2002131633A (en) * | 2000-10-24 | 2002-05-09 | Asahi Optical Co Ltd | Objective lens for endoscope |
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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 |
JP2018128523A (en) * | 2017-02-07 | 2018-08-16 | キヤノン株式会社 | Projection optical system and image projection device having the same |
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1992
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Publication number | Priority date | Publication date | Assignee | Title |
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JPH09503600A (en) * | 1994-07-25 | 1997-04-08 | フィリップス エレクトロニクス ネムローゼ フェンノートシャップ | Wide-angle objective lens system |
JPH08220429A (en) * | 1995-02-17 | 1996-08-30 | Casio Comput Co Ltd | Wide angle lens |
JPH0921947A (en) * | 1995-07-07 | 1997-01-21 | Nikon Corp | Ultrawide angle lens |
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 |
JPH10115777A (en) * | 1996-10-11 | 1998-05-06 | Olympus Optical Co Ltd | Photographic lens |
JP2001159732A (en) * | 1999-12-02 | 2001-06-12 | Nikon Corp | Super wide angle lens and photographic device having the lens |
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 |
US10585262B2 (en) | 2015-02-04 | 2020-03-10 | Largan Precision Co., Ltd. | Optical lens assembly and image capturing device |
US12019210B2 (en) | 2015-02-04 | 2024-06-25 | Largan Precision Co., Ltd. | Optical lens assembly and image capturing device |
US10222583B2 (en) | 2016-10-21 | 2019-03-05 | Largan Precision Co., Ltd. | Micro imaging system, imaging apparatus and electronic device |
JP2018128523A (en) * | 2017-02-07 | 2018-08-16 | キヤノン株式会社 | Projection optical system and image projection device having the same |
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