JPH0750246B2 - Ultra wide-angle shooting lens - Google Patents
Ultra wide-angle shooting lensInfo
- Publication number
- JPH0750246B2 JPH0750246B2 JP63229391A JP22939188A JPH0750246B2 JP H0750246 B2 JPH0750246 B2 JP H0750246B2 JP 63229391 A JP63229391 A JP 63229391A JP 22939188 A JP22939188 A JP 22939188A JP H0750246 B2 JPH0750246 B2 JP H0750246B2
- Authority
- JP
- Japan
- Prior art keywords
- lens
- ultra wide
- angle shooting
- shooting lens
- focal length
- 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.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は超広角撮影レンズに関する。このレンズは、ド
ア監視モニター用のレンズやテレビ電話のモニター用レ
ンズ、FA用ビジュアルセンサー用レンズ等に利用でき
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an ultra wide-angle shooting lens. This lens can be used as a lens for door monitoring monitors, a lens for videophone monitors, and a lens for FA visual sensors.
［従来の技術］ ドア監視モニター等の監視モニターやテレビ電話のモニ
ター、あるいはFAビジュアルセンサー用に用いられる撮
影レンズは、その性質上、使用環境の変化、特に明るさ
の変化に対応できるように、極めて明るいレンズである
ことが要請される。また、かかるレンズは極端な近距離
に於いて大きな撮影範囲を持つ必要がある。[Prior Art] A shooting lens used for a surveillance monitor such as a door surveillance monitor, a videophone monitor, or an FA visual sensor is, by its nature, capable of responding to a change in a use environment, particularly a change in brightness. An extremely bright lens is required. Further, such a lens needs to have a large photographing range at an extremely short distance.
このような要請を満足させるため、この種のレンズは従
来、一般に３枚以上のレンズで構成されていた。In order to satisfy such a demand, this type of lens has conventionally been generally composed of three or more lenses.
［発明が解決しようとする課題］ このように、従来のこの種の撮影レンズは構成レンズ枚
数が多く、そのため低コストでの実現が困難であった。
また、光学性能を保持して尚且つ極端な短焦点化を行う
ことが難しく、モニター等の小型化が困難であった。[Problems to be Solved by the Invention] As described above, the conventional taking lens of this type has a large number of constituent lenses, and thus it has been difficult to realize at low cost.
Further, it is difficult to keep the optical performance and to make the focal length extremely short, and it is difficult to downsize the monitor and the like.
本発明は上述した事情に鑑みてなされたものであって、
その目的とする所は、低コストで実現でき、しかもコン
パクトな超広角撮影レンズの提供にある。The present invention has been made in view of the above circumstances,
The aim is to provide a compact ultra wide-angle photographic lens that can be realized at low cost.
［課題を解決するための手段］ 以下、本発明を説明する。[Means for Solving the Problems] The present invention will be described below.
本発明の超広角撮影レンズは、第１図に示すように物体
側（第１図左方）から像側へ向かって、第１レンズ10お
よび第２レンズ12を、この順序に配置してなる２群２枚
構成である。As shown in FIG. 1, the ultra-wide-angle shooting lens of the present invention has a first lens 10 and a second lens 12 arranged in this order from the object side (left side in FIG. 1) toward the image side. It consists of 2 elements in 2 groups.
第１レンズ10は負のパワーを有する凹メニスカスレン
ズ、第２レンズ12は正のパワーを有する両凸レンズであ
り、１面以上のレンズ面が非球面である。The first lens 10 is a concave meniscus lens having negative power, the second lens 12 is a biconvex lens having positive power, and one or more lens surfaces are aspherical surfaces.
全系の焦点距離をｆ、第２レンズの焦点距離をf2、第１
レンズの像側レンズ面と第２レンズの物体側レンズ面の
面間隔をD2とするとき、これらは、 （Ｉ） 1.0＜f2/f＜2.0 （II） ｆ＜D2＜5f なる条件を満足する。The focal length of the entire system is f, the focal length of the second lens is f 2 , the first lens is
When the surface distance between the image-side lens surface of the lens and the object-side lens surface of the second lens is D 2 , these conditions are (I) 1.0 <f 2 /f<2.0 (II) f <D 2 <5f To be satisfied.
［作用］ 撮影レンズを２枚構成と少ないレンズ枚数で構成し、尚
且つ明るさ、超広角を実現するために１面以上のレンズ
面に非球面を採用した。[Operation] The taking lens is composed of two lenses and a small number of lenses, and one or more lens surfaces are aspherical surfaces to realize brightness and super wide angle.
また、上記条件（Ｉ）はパワー配分を定めたものであ
り、この条件（Ｉ）の下限を越えると第１レンズのパワ
ーが強くなり、光学的な諸収差の補正が困難となる。ま
た、上限を越えると光学系が大きくなるとともに第２レ
ンズのパワーが強くなって、やはり光学的な諸収差の補
正が困難になる。Further, the above condition (I) defines the power distribution, and if the lower limit of this condition (I) is exceeded, the power of the first lens becomes strong and it becomes difficult to correct various optical aberrations. If the upper limit is exceeded, the optical system becomes large and the power of the second lens becomes strong, so that it becomes difficult to correct various optical aberrations.
条件（II）はレンズ系の大きさと、各レンズのパワーを
規定するものであって、下限を越えると各レンズのパワ
ーが強くなり、光学的な諸収差の補正が難しくなる。ま
た上限を越えるとレンズ系全体が大型化してしまう。The condition (II) defines the size of the lens system and the power of each lens. If the lower limit is exceeded, the power of each lens becomes strong and it becomes difficult to correct various optical aberrations. If the upper limit is exceeded, the entire lens system will become large.
［実施例］ 以下に具体的な実施例を挙げる。[Examples] Specific examples are given below.
第１図に於いて、符号20は絞りを示し、符号30は、CCD
等の撮像素子のカバーガラスを示す。In FIG. 1, reference numeral 20 indicates a diaphragm, and reference numeral 30 indicates a CCD.
2 shows a cover glass of an image pickup device such as.
第１図に示すように、物体側から第ｉ番目の面の曲率半
径をRi（ｉ＝１〜６）、面間隔をDi（ｉ＝１〜５）、Nj
（ｊ＝１〜３）をそれぞれ、第１、第２レンズおよびカ
バーガラスの材質の屈折率を表す。またf1は第１レンズ
の焦点距離を表す。As shown in FIG. 1, the radius of curvature of the i-th surface from the object side is Ri (i = 1 to 6), the surface spacing is Di (i = 1 to 5), Nj
(J = 1 to 3) represent the refractive indexes of the materials of the first and second lenses and the cover glass, respectively. Further, f 1 represents the focal length of the first lens.
また、＊の印の付いた面は非球面を表し、各非球面は、
公知の非球面の式 で表される。Ｘは非球面と光軸との交点を原点として光
軸方向の座標であり、Ｙは上記原点を通り光軸に直交す
る方向の座標である。The surface marked with * is an aspherical surface, and each aspherical surface is
Known aspherical formula It is represented by. X is a coordinate in the optical axis direction with the origin being the intersection of the aspherical surface and the optical axis, and Y is a coordinate in the direction passing through the origin and orthogonal to the optical axis.
Ｃ＝1/Riであり、従って各非球面は光軸近傍の曲率半径
Riと、円錐定数Ｋと、高次の非球面係数E,F,G,Hにより
特定される。C = 1 / Ri, so each aspheric surface has a radius of curvature near the optical axis
It is specified by Ri, the conic constant K, and high-order aspherical coefficients E, F, G, and H.
実施例 非球面 第３面 Ｋ＝−3.14288 Ｅ＝−8.95738・10-6,F＝−7.06791・10-8 Ｇ＝1.29022・10-9,H＝2.31618・10-9 第４面 Ｋ＝−1.58708 Ｅ＝2.09416・10-6,F＝2.82478・10-6 Ｇ＝5.39965・10-10,H＝−7.34206・10-10 第２図及び第３図に収差図を示す。図の如く各収差とも
良好に補正されている。Example Aspherical third surface K = −3.14288 E = −8.95738 · 10 −6 , F = −7.06791 · 10 −8 G = 1.29022 · 10 −9 , H = 2.31618 · 10 −9 Fourth surface K = −1.58708 E = 2.09416 · 10 −6 , F = 2.82478 · 10 −6 G = 5.39965 · 10 −10 , H = −7.34206 · 10 −10 Aberration diagrams are shown in FIGS. 2 and 3. As shown in the figure, each aberration is well corrected.
［発明の効果］ 以上、本発明によれば、新規な超広角撮影レンズを提供
できる。[Effects of the Invention] As described above, according to the present invention, it is possible to provide a novel ultra wide-angle shooting lens.
このレンズは上記の如く２枚のレンズで構成されるので
小型化が可能で、低コストで実現できる。しかも、非球
面の採用により従来のものに優るとも劣らない良好な性
能を実現できる。Since this lens is composed of two lenses as described above, it can be miniaturized and realized at low cost. Moreover, by adopting an aspherical surface, it is possible to realize good performance that is not inferior to the conventional one.
第１図は、本発明のレンズ構成を実施例として示す図、
第２図及び第３図は、実施例に関連した収差図である。 10……第１レンズ、12……第２レンズFIG. 1 is a diagram showing a lens configuration of the present invention as an embodiment,
2 and 3 are aberration diagrams related to the example. 10 …… First lens, 12 …… Second lens
Claims (1)
よび第２レンズを、この順序に配置してなり、 第１レンズは負のパワーを有する凹メニスカスレンズ、
第２レンズは正のパワーを有する両凸レンズであって、
１面以上のレンズ面が非球面であり、 全系の焦点距離をｆ、第２レンズの焦点距離をf2、第１
レンズの像側レンズ面と第２レンズの物体側レンズ面と
の面間隔をD2とするとき、これらが、 （Ｉ） 1.0＜f2/f＜2.0 （II） ｆ＜D2＜5f なる条件を満足することを特徴とする超広角撮影レン
ズ。1. A first lens and a second lens are arranged in this order from the object side to the image side, the first lens being a concave meniscus lens having negative power,
The second lens is a biconvex lens having positive power,
One or more lens surfaces are aspherical surfaces, the focal length of the entire system is f, the focal length of the second lens is f 2 ,
When the surface distance between the image side lens surface of the lens and the object side lens surface of the second lens is D 2 , these are (I) 1.0 <f 2 /f<2.0 (II) f <D 2 <5f An ultra wide-angle shooting lens characterized by satisfying the conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63229391A JPH0750246B2 (en) | 1988-09-13 | 1988-09-13 | Ultra wide-angle shooting lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63229391A JPH0750246B2 (en) | 1988-09-13 | 1988-09-13 | Ultra wide-angle shooting lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0277712A JPH0277712A (en) | 1990-03-16 |
| JPH0750246B2 true JPH0750246B2 (en) | 1995-05-31 |
Family
ID=16891465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63229391A Expired - Fee Related JPH0750246B2 (en) | 1988-09-13 | 1988-09-13 | Ultra wide-angle shooting lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0750246B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04107407A (en) * | 1990-08-28 | 1992-04-08 | Nisshin Koki Kk | Wide-angle lens |
| US5619380A (en) * | 1992-05-25 | 1997-04-08 | Olympus Optical Co. Ltd. | Objective optical system for endoscopes |
| US6577456B2 (en) | 2001-03-29 | 2003-06-10 | Fuji Photo Optical Co., Ltd. | Single focus lens |
| JP3717486B2 (en) | 2003-03-10 | 2005-11-16 | フジノン株式会社 | Imaging lens |
| JP4613111B2 (en) | 2005-07-20 | 2011-01-12 | アルプス電気株式会社 | Optical device |
| CN102768396A (en) * | 2011-05-03 | 2012-11-07 | 凤凰光学(上海)有限公司 | Medical endoscope ultra-wide field type pick-up lens |
-
1988
- 1988-09-13 JP JP63229391A patent/JPH0750246B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0277712A (en) | 1990-03-16 |
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