JPH06148518A - Photographic lens - Google Patents

Photographic lens

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Publication number
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
Authority
JP
Japan
Prior art keywords
lens
group
negative
positive
lenses
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
JP4314445A
Other languages
Japanese (ja)
Other versions
JP3324802B2 (en
Inventor
Tsutomu Uzawa
勉 鵜澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP31444592A priority Critical patent/JP3324802B2/en
Priority to US08/124,592 priority patent/US5448319A/en
Publication of JPH06148518A publication Critical patent/JPH06148518A/en
Priority to US08/418,456 priority patent/US5648835A/en
Application granted granted Critical
Publication of JP3324802B2 publication Critical patent/JP3324802B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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. nu1 is an Abbe number of the negative lens in the first group, nu2p, nu2 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.

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。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.

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

【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)

【特許請求の範囲】[Claims] 【請求項１】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.
JP31444592A 1992-09-22 1992-10-30 Shooting lens Expired - Fee Related JP3324802B2 (en)

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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US5822128A (en) * 1996-03-22 1998-10-13 Nikon Corporation Projection lenses for display elements and projection systems comprising same
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Publication number Priority date Publication date Assignee Title
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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