JP3752025B2 - Large aperture ultra wide angle lens system - Google Patents
Large aperture ultra wide angle lens system Download PDFInfo
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- JP3752025B2 JP3752025B2 JP21969796A JP21969796A JP3752025B2 JP 3752025 B2 JP3752025 B2 JP 3752025B2 JP 21969796 A JP21969796 A JP 21969796A JP 21969796 A JP21969796 A JP 21969796A JP 3752025 B2 JP3752025 B2 JP 3752025B2
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
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Description
【０００１】
【技術分野】
本発明は、ＣＣＴＶカメラ等の小型テレビカメラに適用できる大口径超広角レンズに関する。
【０００２】
【従来技術及びその問題点】
小型テレビカメラにおいて、撮像素子の小型化高解像度化に伴い、画面サイズが１／２”（インチ）から１／３”へ移行しつつある。このため、Ｆナンバーの小さい大口径の撮像レンズが要求されているが、従来はＦ１．０から１．２程度であった。
【０００３】
【発明の目的】
本発明は、撮像素子の画面サイズが１／３”程度の小型テレビカメラに用いることができる、Ｆ０．８〜０．９５程度と非常に大口径でかつ半画角６０°程度という超広角レンズを得ることを目的とする。
【０００４】
【発明の概要】
本発明の大口径超広角レンズ系は、物体側から順に、負のパワーを有する前群レンズと；絞りと；正のパワーを有する後群レンズと；を備え、前記前群レンズは、レンズ間隔最大位置で、負のパワーを有する第１ａレンズ群と、負のパワーを有する第１ｂレンズ群とに分かれ、次の条件式（１）ないし（４）を満足することを特徴としている。
（１）-０．５＜ｆ／ｆF ＜-０．２
（２）-０．２＜ｆ／ｆ1a＜-０．０７
（３）３＜ｄab／ｆ＜７
（４）１２．２≦ΣdF+S／ｆ＜１５
但し、
ｆ：全系の焦点距離、
ｆF ：前群レンズの焦点距離、
ｆ1a：第１ａレンズ群の焦点距離、
ｄab：第１ａレンズ群と第１ｂレンズ群の間隔、
ΣdF+S：前群レンズの厚みと前後群レンズ間隔の和、
である。
【０００５】
本発明の大口径超広角レンズ系の後群レンズは、具体的には、後群レンズは、物体側より順に、像面側に凸面を有する正レンズと、像面側に凹の貼り合わせ面を有する負レンズと正レンズの貼り合わせレンズと、物体側に凸面を有する正レンズの３群４枚から構成され、これらのレンズの少なくとも一面に発散性の非球面を設け、かつ、次の条件式（５）を満足することが好ましい。
（５）５．０＜Σ d R ／ｆ＜１０．０
但し、
Σ d R ：後群レンズの厚み、
である。
【０００６】
【発明の実施の態様】
本発明の大口径広角レンズ系は、負レンズ群、絞、正レンズ群の２群構成を対象としている。この負、正の２群の広角レンズ系では、小型テレビカメラの撮像素子の画面サイズが１／２”から１／３”へと小型化されるのに伴って焦点距離が短くなると、１／２”のときと同じバックフォーカス（ｆB ）を確保するために、前群の負のパワーがより必要となる。また、前群の全系に対するパワー配置も工夫が必要となる。
条件式（１）は、前群レンズの負のパワーに関するもので、上限を越えるとバックフォーカスが小さくなり過ぎ、小型テレビカメラに装着できない。下限を越えると、前群レンズ内で発生する収差が大きくなり、収差補正が困難となる。
【０００７】
条件式（２）は、第１ａレンズ群のパワーに関する条件である。条件式（２）の上限を越えると、十分なバックフォーカスが得られなくなり、下限を越えると、第１ａレンズ群の負のパワーが大となり、凹面の曲率半径が小さくなって、レンズの径と曲率半径の比が大となり、製造が困難となる。
【０００８】
条件式（３）は、第１ａレンズ群と第１ｂレンズ群の間隔に関する条件である。条件式（３）に示すように、第１ａレンズ群と第１ｂレンズ群の間隔を大きく設定することにより、収差補正をさらに良好にし、バックフォーカスを大きくすることができる。条件式（３）の上限を越えると、前群レンズの径が増大し、下限を越えると、十分なバックフォーカスが得られなくなる。
【０００９】
また、本発明は、半画角６０°程度という超広角を包括するので、絞りより離れている第１ａレンズ群の径は、第１ｂレンズ群の径よりかなり大きくなってしまう。従って、下限を越えると、絞りと第１ａレンズ群の距離が小さくなり、第１ａレンズ群と絞り機構が干渉するという問題が発生する。絞り機構と干渉しないためにも、条件式（３）の下限が必要である。
【００１０】
なお、前群レンズ中の第１ａレンズ群のパワーは、前群レンズ全体のパワーに対して、０．３＜ｆF ／ｆ1a＜０．５に設定するのが好ましい。下限を越えて第１ａレンズ群のパワーが小さいと、十分なバックフォーカスを得ることが難しくなり、上限を越えて第１ａレンズ群のパワーが大きいと（つまり第１ａレンズ群のパワーが前群レンズ全体のパワーの半分以上となると）、レンズの径と曲率半径の比が大きくなり製造が困難となる。
【００１１】
条件式（４）は、前群レンズのレンズ厚と、前後群レンズ間隔の和に関する条件である。条件式（４）の上限を越えると、レンズ全長が増大するだけでなく、前群レンズの径が大きくなり、下限を越えると、バックフォーカスを大きくすることが困難となり、あるいはバックフォーカスを大きくするためには前群レンズの負のパワーが増大し、収差補正が困難となる。
【００１３】
条件式（５）は、後群レンズのレンズ厚に関するもので、大口径化のための条件である。条件式（５）の上限を越えると、レンズ全長及び後群レンズの径が増大し、下限を越えると、レンズの周辺厚が小さくなり、Ｆ０．８〜０．９５程度という大口径の超広角レンズを得ることができない。
【００１５】
次に、具体的な実施例について本発明を説明する。図１、図３、図５はそれぞれ実施例１、２、３のレンズ構成図である。いずれの実施例も、物体側から順に、前群レンズ１１と、絞Ｓと、後群レンズ１２とからなっていて、前群レンズ１１は、レンズ間隔が最大の位置（レンズ間隔ｄ2 ）で第１ａレンズ群１１ａと第１ｂレンズ群１１ｂに分けられている。第１ａレンズ群１１ａは物体側に凸面を向けたメニスカス単レンズ（面No. １、２）からなり、第１ｂレンズ群１１ｂは、２群３枚（面No. ３〜７）からなっている。後群レンズ１２は、両凸の正レンズ１２ａと、像面側に凹面を有する負レンズ１２ｂと、両凸の正レンズ１２ｃと、両凸の正レンズ１２ｄとからなり、負レンズ１２ｂと正レンズ１２ｃは貼り合わされている。両凸の正レンズ１２ａの像面側の面（面No.9) の曲率は物体側の面（面No.8) の曲率より大きく、負レンズ１２ｂと正レンズ１２ｃの貼り合わせレンズの貼り合わせ面（面No.11)の曲率は、他の面（面No.10、12) の曲率より大きい。両凸の正レンズ１２ｄの物体側の面（面No.13)の曲率は像面側の面（面No.14)の曲率より大きい。面No. １５、１６は、ＣＣＤのカバーガラス１３である。尚、カバーガラス１３は、カバーガラスとフィルターを１つにまとめたものであるが、以下、カバーガラスと略して表現する。
【００１６】
［実施例１］
図１は、本発明の大口径超広角レンズ系の実施例１のレンズ構成図である。このレンズ系の数値データを表１に示し、このレンズ系での諸収差を図２に示す。諸収差図中、ＳＡは球面収差、ＳＣは正弦条件、ｄ線、ｇ線、ｃ線は、それぞれの波長における、球面収差によって示される色収差、Ｓはサジタル、Ｍはメリディオナルを示している。
【００１７】
表および図面中、FNO はF ナンバー、F は焦点距離、ωは半画角、fBはバックフォーカス（最終レンズの像側面からカバーガラス１３を含んでＣＣＤの撮像面迄の距離、実施例では、カバーガラスの第２面を撮像面としている）、ｒi はレンズ各面の曲率半径、ｄi はレンズ厚もしくはレンズ間隔、Ｎはｄ線の屈折率、νはｄ線のアッベ数を示す。
【００１８】
【表１】
x=cy2/{1+[1-(1+K)c2y2]1/2}+A4y4+A6y6+A8y8+・・・
（c は曲率(1/r)、y は光軸からの高さ、Ｋは円錐係数)
【００１９】
［実施例２］
図３は、本発明の大口径超広角レンズ系の実施例２のレンズ構成図である。このレンズ系の数値データを表２に示し、その諸収差を図４に示す。
【００２０】
【表２】
［実施例３］
図５は、本発明の大口径超広角レンズ系の実施例３のレンズ構成図である。このレンズ系の数値データを表３に示し、その諸収差を図６に示す。
【００２２】
【表３】
次に、実施例１ないし３の各条件式に対応する値を表４に示す。
【表４】
実施例１ 実施例２ 実施例３
条件式（１） -0.28 -0.28 -0.29
条件式（２） -0.13 -0.13 -0.13
条件式（３） 4.83 4.99 5.24
条件式（４） 12.3 12.7 12.2
条件式（５） 7.22 6.61 6.59
ｆF／ｆ1a 0.46 0.45 0.44
【００２４】
表４から明かなように、実施例１から実施例３は、いずれも条件式（１）ないし（５）を満足している。さらに、各実施例はｆF／ｆ1aの値が示すように、第１ａレンズ群のパワーが前群レンズ全体のパワーに対して半分以下である。各収差図に示すように諸収差もよく補正されている。
【００２５】
【発明の効果】
本発明の大口径超広角レンズ系によれば、小型テレビカメラ用のＦ０．８〜０．９５程度の非常に大口径でかつ半画角６０°程度という高性能な超広角なレンズを得ることができる。
【図面の簡単な説明】
【図１】本発明による大口径超広角レンズ系の第１の実施例を示すレンズ構成図である。
【図２】図１のレンズ系の諸収差図である。
【図３】本発明による大口径超広角レンズ系の第２の実施例を示すレンズ構成図である。
【図４】図３のレンズ系の諸収差図である。
【図５】本発明による大口径超広角レンズ系の第３の実施例を示すレンズ構成図である。
【図６】図５のレンズ系の諸収差図である。[0001]
【Technical field】
The present invention relates to a large-diameter ultra-wide-angle lens that can be applied to a small television camera such as a CCTV camera.
[0002]
[Prior art and its problems]
In small television cameras, the screen size is shifting from ½ ″ (inch) to ”″ as the image sensor becomes smaller and higher in resolution. For this reason, an imaging lens having a small F-number and a large aperture is required, but conventionally it was about F1.0 to 1.2.
[0003]
OBJECT OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention is an ultra-wide-angle lens having a very large aperture of about F0.8 to 0.95 and a half angle of view of about 60 °, which can be used for a small television camera with an image pickup device having a screen size of about 1/3 ″. The purpose is to obtain.
[0004]
SUMMARY OF THE INVENTION
The large-aperture ultra-wide-angle lens system of the present invention includes, in order from the object side, a front group lens having negative power; a stop; and a rear group lens having positive power. At the maximum position, it is divided into a 1a lens group having negative power and a 1b lens group having negative power, and the following conditional expressions (1) to (4) are satisfied.
(1) -0.5 <f / f F <-0.2
(2) -0.2 <f / f 1a <-0.07
(3) 3 <d ab / f <7
(4) 12.2 ≦ Σd F + S / f <15
However,
f: focal length of the entire system,
f F : focal length of the front lens group,
f 1a : the focal length of the 1a lens group,
d ab : the distance between the 1a lens group and the 1b lens group,
Σd F + S : Sum of the thickness of the front lens group and the distance between the front and rear lens groups,
It is.
[0005]
Specifically, the rear group lens of the large-aperture ultra-wide-angle lens system of the present invention is composed of a positive lens having a convex surface on the image surface side and a cemented surface concave on the image surface side in order from the object side. And a positive lens having a convex surface on the object side, and a divergent aspherical surface is provided on at least one surface of these lenses, and the following conditions It is preferable to satisfy Formula (5) .
(5) 5.0 <Σ d R /f<10.0
However,
Σ d R : Thickness of the rear lens group,
It is.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
The large-aperture wide-angle lens system of the present invention is intended for a two-group configuration of a negative lens group, a stop, and a positive lens group. In the negative and positive two-group wide-angle lens system, when the focal length becomes shorter as the screen size of the image sensor of the small TV camera is reduced from 1/2 "to 1/3", 1 / In order to secure the same back focus (f B ) as in the case of 2 ″, the negative power of the front group is required more. Also, the power arrangement for the entire system of the front group needs to be devised.
Conditional expression (1) relates to the negative power of the front lens group. If the upper limit is exceeded, the back focus becomes too small to be attached to a small TV camera. If the lower limit is exceeded, aberrations occurring in the front lens group will increase, making it difficult to correct aberrations.
[0007]
Conditional expression (2) is a condition regarding the power of the first-a lens group. If the upper limit of conditional expression (2) is exceeded, sufficient back focus cannot be obtained, and if the lower limit is exceeded, the negative power of the lens group 1a increases, the radius of curvature of the concave surface decreases, and the lens diameter The ratio of the radius of curvature becomes large, making it difficult to manufacture.
[0008]
Conditional expression (3) is a condition regarding the distance between the 1a lens group and the 1b lens group. As shown in the conditional expression (3), by setting the distance between the 1a lens group and the 1b lens group large, aberration correction can be further improved and the back focus can be increased. When the upper limit of conditional expression (3) is exceeded, the diameter of the front lens group increases, and when the lower limit is exceeded, sufficient back focus cannot be obtained.
[0009]
In addition, since the present invention includes a super-wide angle of about 60 [deg.], The diameter of the 1a lens group that is far from the stop is considerably larger than the diameter of the 1b lens group. Therefore, if the lower limit is exceeded, the distance between the stop and the 1a lens group becomes small, causing a problem that the 1a lens group and the stop mechanism interfere with each other. In order not to interfere with the aperture mechanism, the lower limit of conditional expression (3) is necessary.
[0010]
The power of the 1a lens group in the front group lens is preferably set to 0.3 <f F / f 1a <0.5 with respect to the power of the entire front group lens. If the power of the 1a lens group is small beyond the lower limit, it is difficult to obtain sufficient back focus, and if the power of the 1a lens group is large beyond the upper limit (that is, the power of the 1a lens group is the front group lens). If the power is more than half of the total power), the ratio of the lens diameter to the radius of curvature becomes large, making it difficult to manufacture.
[0011]
Conditional expression (4) is a condition regarding the sum of the lens thickness of the front lens group and the distance between the front and rear lens groups. Exceeding the upper limit of conditional expression (4) not only increases the total lens length, but also increases the diameter of the front lens group, and exceeding the lower limit makes it difficult to increase the back focus, or increases the back focus. For this reason, the negative power of the front lens group increases, and aberration correction becomes difficult.
[0013]
Conditional expression (5) relates to the lens thickness of the rear lens group, and is a condition for increasing the diameter. If the upper limit of conditional expression (5) is exceeded, the total lens length and the diameter of the rear lens group will increase. If the lower limit is exceeded, the peripheral thickness of the lens will decrease, and an ultra wide angle with a large aperture of about F0.8 to 0.95. I can't get a lens.
[0015]
Next, the present invention will be described with reference to specific examples. 1, 3, and 5 are lens configuration diagrams of Examples 1, 2, and 3, respectively. Each of the embodiments includes a
[0016]
[Example 1]
FIG. 1 is a lens configuration diagram of Example 1 of the large-diameter super wide-angle lens system of the present invention. Numerical data of this lens system is shown in Table 1, and various aberrations in this lens system are shown in FIG. In the various aberration diagrams, SA is spherical aberration, SC is sinusoidal, d-line, g-line, and c-line are chromatic aberrations indicated by spherical aberration at each wavelength, S is sagittal, and M is meridional.
[0017]
In the tables and drawings, F NO is the F number, F is the focal length, ω is the half angle of view, f B is the back focus (the distance from the image side surface of the final lens to the imaging surface of the CCD, including the
[0018]
[Table 1]
x = cy 2 / {1+ [1- (1 + K) c 2 y 2 ] 1/2 } + A4y 4 + A6y 6 + A8y 8 + ...
(C is the curvature (1 / r), y is the height from the optical axis, K is the cone coefficient)
[0019]
[Example 2]
FIG. 3 is a lens configuration diagram of Example 2 of the large-diameter super wide-angle lens system of the present invention. Numerical data of this lens system is shown in Table 2, and various aberrations are shown in FIG.
[0020]
[Table 2]
[Example 3]
FIG. 5 is a lens configuration diagram of Example 3 of the large-diameter super wide-angle lens system of the present invention. Numerical data of this lens system is shown in Table 3, and various aberrations are shown in FIG.
[0022]
[Table 3]
Next, Table 4 shows values corresponding to the conditional expressions of Examples 1 to 3.
[Table 4]
Example 1 Example 2 Example 3
Conditional expression (1) -0.28 -0.28 -0.29
Conditional expression (2) -0.13 -0.13 -0.13
Conditional expression (3) 4.83 4.99 5.24
Conditional expression (4) 12.3 12.7 12.2
Conditional expression (5) 7.22 6.61 6.59
f F / f 1a 0.46 0.45 0.44
[0024]
As is clear from Table 4, each of Examples 1 to 3 satisfies the conditional expressions (1) to (5) . Further, in each example, as indicated by the value of f F / f 1a , the power of the first lens group is less than half of the power of the entire front lens group. As shown in each aberration diagram, various aberrations are well corrected.
[0025]
【The invention's effect】
According to the large-aperture super-wide-angle lens system of the present invention, a high-performance super-wide-angle lens having a very large aperture of about F0.8 to 0.95 and a half angle of view of about 60 ° for a small TV camera is obtained. Can do.
[Brief description of the drawings]
FIG. 1 is a lens configuration diagram showing a first example of a large-aperture ultra-wide-angle lens system according to the present invention.
2 is a diagram showing various aberrations of the lens system of FIG. 1. FIG.
FIG. 3 is a lens configuration diagram showing a second example of the large-aperture ultra-wide-angle lens system according to the present invention.
4 is a diagram illustrating various aberrations of the lens system in FIG. 3. FIG.
FIG. 5 is a lens configuration diagram showing a third example of the large-aperture ultra-wide-angle lens system according to the present invention.
6 is a diagram illustrating various aberrations of the lens system in FIG. 5. FIG.
Claims (2)
前記前群レンズは、レンズ間隔最大位置で、負のパワーを有する第１ａレンズ群と、負のパワーを有する第１ｂレンズ群とに分かれ、
下記の条件式（１）ないし（４）を満足する大口径超広角レンズ系。
（１）-０．５＜ｆ／ｆF ＜-０．２
（２）-０．２＜ｆ／ｆ1a＜-０．０７
（３）３＜ｄab／ｆ＜７
（４）１２．２≦ΣdF+S／ｆ＜１５
但し、
ｆ：全系の焦点距離、
ｆF ：前群レンズの焦点距離、
ｆ1a：第１ａレンズ群の焦点距離、
ｄab：第１ａレンズ群と第１ｂレンズ群の間隔、
ΣdF+S：前群レンズの厚みと前後群レンズ間隔の和。In order from the object side, a front group lens having negative power; a diaphragm; and a rear group lens having positive power;
The front group lens is divided into a 1a lens group having negative power and a 1b lens group having negative power at a lens interval maximum position,
A large-aperture ultra-wide-angle lens system that satisfies the following conditional expressions (1) to (4).
(1) -0.5 <f / f F <-0.2
(2) -0.2 <f / f 1a <-0.07
(3) 3 <d ab / f <7
(4) 12.2 ≦ Σd F + S / f <15
However,
f: focal length of the entire system,
f F : focal length of the front lens group,
f 1a : the focal length of the 1a lens group,
d ab : the distance between the 1a lens group and the 1b lens group,
Σd F + S : Sum of the thickness of the front lens group and the distance between the front and rear lens groups.
（５）５．０＜ΣdR／ｆ＜１０．０
但し、
ΣdR：後群レンズの厚み。2. The large-aperture ultra-wide-angle lens system according to claim 1, wherein the rear group lens includes, in order from the object side, a positive lens having a convex surface on the image surface side, and a negative lens and a positive lens having a concave bonding surface on the image surface side. And a positive lens having a convex surface on the object side, and at least one of these lenses has a divergent aspherical surface and satisfies the following conditional expression (5) Large-aperture ultra-wide-angle lens system.
(5) 5.0 <Σd R /f<10.0
However,
Σd R : Thickness of the rear lens group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21969796A JP3752025B2 (en) | 1995-08-25 | 1996-08-21 | Large aperture ultra wide angle lens system |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7-217733 | 1995-08-25 | ||
| JP21773395 | 1995-08-25 | ||
| JP21969796A JP3752025B2 (en) | 1995-08-25 | 1996-08-21 | Large aperture ultra wide angle lens system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09127413A JPH09127413A (en) | 1997-05-16 |
| JP3752025B2 true JP3752025B2 (en) | 2006-03-08 |
Family
ID=26522184
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21969796A Expired - Fee Related JP3752025B2 (en) | 1995-08-25 | 1996-08-21 | Large aperture ultra wide angle lens system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3752025B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4007468B2 (en) | 1998-07-23 | 2007-11-14 | フジノン株式会社 | Wide-angle lens with long back focus |
| JP4862263B2 (en) * | 2004-03-31 | 2012-01-25 | 株式会社ニコン | Super wide-angle lens and photographing apparatus equipped with the super-wide angle lens |
| JP4638214B2 (en) | 2004-12-15 | 2011-02-23 | Ｈｏｙａ株式会社 | Large aperture wide angle lens system |
| JP5396888B2 (en) * | 2009-01-30 | 2014-01-22 | 株式会社ニコン | Wide angle lens, imaging device, and manufacturing method of wide angle lens |
| CN104583833B (en) | 2012-08-24 | 2016-11-23 | 富士胶片株式会社 | Imaging lens system and possess the camera head of this imaging lens system |
| JP2021006859A (en) | 2019-06-28 | 2021-01-21 | セイコーエプソン株式会社 | Projection optical system and projector |
| JP2021006858A (en) | 2019-06-28 | 2021-01-21 | セイコーエプソン株式会社 | Projection optical system and projector |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH073503B2 (en) * | 1986-03-06 | 1995-01-18 | キヤノン株式会社 | Wide-angle lens with long back focus |
| JPH0763989A (en) * | 1993-06-16 | 1995-03-10 | Asahi Optical Co Ltd | Large aperture aspherical lens system |
| JP3397447B2 (en) * | 1993-06-18 | 2003-04-14 | ペンタックス株式会社 | Large aperture super wide angle lens system |
-
1996
- 1996-08-21 JP JP21969796A patent/JP3752025B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JPH09127413A (en) | 1997-05-16 |
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