JPS6132650B2 - - Google Patents
Info
- Publication number
- JPS6132650B2 JPS6132650B2 JP56173442A JP17344281A JPS6132650B2 JP S6132650 B2 JPS6132650 B2 JP S6132650B2 JP 56173442 A JP56173442 A JP 56173442A JP 17344281 A JP17344281 A JP 17344281A JP S6132650 B2 JPS6132650 B2 JP S6132650B2
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- diverging
- diverging lens
- condition
- telephoto
- 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
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Description
一般にレンズ系の焦点合せはレンズ系全体を繰
出すことによつて行なわれるが、その繰出量は焦
点距離が長くなる程大きくなり、望遠レンズで
は、レンズ系全体の大きさも大きく、重量も重く
なるので、繰出し装置が大型化し、高価になると
ともに操作性も悪くなる。
これに対してレンズ系の一部のレンズ群を光軸
方向に移動することにより焦点合せを行なう方式
では、移動レンズ群の移動量を小さくすることが
でき、また移動するレンズ系が小型軽量となる
為、安価で操作性の良い焦点合せ装置が可能とな
る利点がある。
しかしながら、この方式では、レンズ群の移動
にともない移動レンズ群に入射する光線の入射高
が変化する為、収差の変動、特に球面収差の変動
が大きく、焦点合せによる結像性能の劣化が大き
くなる欠点がある。
本発明は、第１，５，９，１３図の実施例に示
すように、物体側より、第１収束レンズ群G1、
第２発散レンズ群G2、第３発散レンズ群G3より
構成され、第２発散レンズ群G2を光軸上像側に
移動することにより、より近距離の物体への合焦
を行なう望遠レンズであつて、各レンズ群の適切
な度の配分と配置を考慮することにより焦点合せ
による収差変動のきわめて少ない望遠レンズを提
供することを目的とする。
上記のように構成された本発明のレンズ系にお
いては、レンズ系全体としての焦点距離をＦ、第
１収束レンズ群G1の焦点距離をf1、第２発散レン
ズ群G2の焦点距離をf2、第１収束レンズ群の像側
主点と第２発散レンズ群の物体側主点との間隔を
ｅとするとき、
(1) 0.15＜ｆ１−ｅ／｜ｆ２｜
(2) 1.0＜｜ｆ２｜／Ｆ＜4.5
但しf2＜０
の条件を満足しなければならない。
条件(1)は第２発散レンズ群G2の移動量を適度
な量にとどめる為の条件で、この条件外では、第
２発散レンズ群の移動量が大きくなり、焦点合せ
の際の操作性が悪くなり好ましくない。
条件(2)は条件(1)と相まつて、第２発散レンズ群
G2の移動にともなう収差変動を小さく抑えると
ともに所望の望遠比を得る為の条件である。
条件(2)の下限を超えると、第２発散レンズ群の
移動量を小さく抑えるには有利であるが、第２発
散レンズ群の度が強くなる為、第２発散レンズ群
内の各面での収差補正の負担が大きくなり、第２
発散レンズ群の移動による収差変動を小さくする
ことが困難となる。
また条件(2)の上限を超えると、第２発散レンズ
群による収差変動を抑えるには有利であるが、条
件(1)を満足するにはf1が大となり、その結果望遠
比も大となつてレンズ系全体も大きくなり好まし
くない
本発明は上記の構成により、第２発散レンズ群
G2を光軸上像側に移動して、より近距離の物体
に焦点合せを行ない、焦点合せの際の収差変動の
きわめて少ない望遠レンズを実現するものである
が、本発明の実施にあたつては以下の条件を考慮
することは有益である。すなわち、第２発散レン
ズ群G2の最も物体側の面の曲率半径をｒF、曲率
半径の符号が負で最も正の屈折力をもつ面の曲率
半径をｒRとしたとき、
0.1＜ｒＲ／ｒＦ＜0.8
の条件を満足すれば設計が容易となる。つまり、
この条件外では第２発散レンズ群内での各面での
収差補正のバランスが悪くなり、第２発散レンズ
群の移動による収差変動を小さくする為に他のレ
ンズ群への負担が大となり好ましくない。
また、第２発散レンズ群G2の焦点距離をf2、第
３発散レンズ群G3の焦点距離をf3とするとき
｜f2｜＞｜f3｜
但しf2＜０、f3＜０
の条件を満足すれば、収差補正における第２発散
レンズ群の負担が軽くなり、第２発散レンズ群の
移動による収差変動、特に球面収差の変動を小さ
く抑えることが容易となる。つまり、本発明によ
る構成の望遠レンズでは、第１収束レンズ群で発
生した負の球面収差を第２発散レンズ群と第３発
散レンズ群で発生する正の球面収差で分担して補
正するのが一般的であるが、条件外では第２発散
レンズ群での収差補正の負担が大となり、第２発
散レンズ群の移動による収差変動を抑える上で好
ましくない。
次に本発明の実施例を示す。レンズデータにお
いて、ｒiは第ｉ面のレンズ面曲率半径、ｄiは第
ｉ番目のレンズ厚またはレンズ間隔、ｎはｄ−
lineに対する屈折率、νはアツベ数、ωは半画角
である。
実施例 １
Generally, focusing of a lens system is performed by extending the entire lens system, but the amount of extension increases as the focal length increases, and with telephoto lenses, the entire lens system becomes larger and heavier. As a result, the feeding device becomes larger, more expensive, and has poor operability. On the other hand, in a method that performs focusing by moving some of the lens groups in the lens system in the optical axis direction, the amount of movement of the moving lens group can be reduced, and the moving lens system can be made smaller and lighter. Therefore, there is an advantage that a focusing device that is inexpensive and has good operability can be provided. However, in this method, as the lens group moves, the incident height of the light ray that enters the moving lens group changes, resulting in large fluctuations in aberrations, especially spherical aberration, and a significant deterioration in imaging performance due to focusing. There are drawbacks. As shown in the embodiments of FIGS. 1, 5, 9, and 13, the present invention includes, from the object side, a first converging lens group G 1 ,
Consisting of a second diverging lens group G 2 and a third diverging lens group G 3 , the telephoto lens focuses on objects at a closer distance by moving the second diverging lens group G 2 toward the image side on the optical axis. It is an object of the present invention to provide a telephoto lens that exhibits extremely small fluctuations in aberrations due to focusing by considering appropriate power distribution and arrangement of each lens group. In the lens system of the present invention configured as described above, the focal length of the entire lens system is F, the focal length of the first converging lens group G1 is f1 , and the focal length of the second diverging lens group G2 is F. When f 2 is the distance between the image-side principal point of the first converging lens group and the object-side principal point of the second diverging lens group, (1) 0.15<f 1 -e/|f 2 | (2) 1.0<|f 2 |/F<4.5 However, the condition of f 2 <0 must be satisfied. Condition (1) is a condition for keeping the amount of movement of the second diverging lens group G2 to an appropriate amount. Outside of this condition, the amount of movement of the second diverging lens group becomes large and operability during focusing becomes difficult. becomes worse, which is not desirable. Condition (2), together with condition (1), means that the second diverging lens group
This is a condition for suppressing aberration fluctuations due to movement of G 2 to a small value and obtaining a desired telephoto ratio. If the lower limit of condition (2) is exceeded, it is advantageous to keep the amount of movement of the second diverging lens group small, but since the power of the second diverging lens group becomes stronger, each surface within the second diverging lens group The burden of aberration correction increases, and the second
It becomes difficult to reduce aberration fluctuations due to movement of the diverging lens group. Furthermore, if the upper limit of condition (2) is exceeded, it is advantageous to suppress aberration fluctuations due to the second diverging lens group, but f 1 will be large to satisfy condition (1), and as a result, the telephoto ratio will also be large. This increases the size of the entire lens system, which is undesirable.
G 2 is moved to the image side on the optical axis to focus on objects at a closer distance, thereby realizing a telephoto lens with extremely small aberration fluctuations during focusing. In the future it is useful to consider the following conditions: That is, when the radius of curvature of the surface closest to the object side of the second diverging lens group G 2 is r F , and the radius of curvature of the surface with the negative sign and the most positive refractive power is r R , 0.1<r The design becomes easy if the condition R /r F <0.8 is satisfied. In other words,
Outside of this condition, the balance of aberration correction on each surface within the second diverging lens group will be poor, and the burden on other lens groups will be large in order to reduce aberration fluctuations due to movement of the second diverging lens group, which is not preferable. do not have. Further, when the focal length of the second diverging lens group G 2 is f 2 and the focal length of the third diverging lens group G 3 is f 3 , |f 2 |>|f 3 | However, f 2 <0, f 3 < If the condition 0 is satisfied, the burden on the second diverging lens group in correcting aberrations will be reduced, and it will be easy to suppress aberration fluctuations, especially fluctuations in spherical aberration, due to movement of the second diverging lens group. In other words, in the telephoto lens configured according to the present invention, the negative spherical aberration generated in the first converging lens group is corrected by sharing it with the positive spherical aberration generated in the second diverging lens group and the third diverging lens group. Although it is common, outside the conditions, the burden of aberration correction on the second diverging lens group becomes large, which is not preferable in terms of suppressing aberration fluctuations due to movement of the second diverging lens group. Next, examples of the present invention will be shown. In the lens data, r i is the radius of curvature of the i-th lens surface, d i is the i-th lens thickness or lens spacing, and n is d-
The refractive index for the line, ν is the Atsube number, and ω is the half angle of view. Example 1
【表】【table】
【表】 実施例 ２【table】 Example 2
【表】【table】
【表】 実施例 ３【table】 Example 3
【表】 実施例 ４【table】 Example 4
【表】
以上本発明によれば、第１収束レンズ群、第２
発散レンズ群、第３発散レンズ群より構成される
望遠レンズで、第２発散レンズ群を光軸上像側に
移動することによつて、収差を劣化させることな
く、より近距離の物体に焦点合せを行なえるもの
である。これにより、レンズ系全体を繰出して焦
点合せを行なう方式の望遠レンズと比較して、焦
点合せ装置が小型軽量化され、安価で操作性の良
い焦点合せ機構が可能となる利点がある。[Table] According to the present invention, the first converging lens group, the second
A telephoto lens consisting of a diverging lens group and a third diverging lens group.By moving the second diverging lens group toward the image side on the optical axis, it is possible to focus on objects at a closer distance without deteriorating aberrations. It is possible to perform matching. As a result, compared to a telephoto lens in which focusing is performed by extending the entire lens system, the focusing device can be made smaller and lighter, and there is an advantage that a focusing mechanism that is inexpensive and easy to operate can be realized.
第１図、第５図、第９図および第１３図は各々
実施例１、実施例２、実施例３および実施例４の
撮影距離無限遠の時のレンズ断面図。第２図、第
６図、第１０図および第１４図は各々実施例１、
実施例２、実施例３および実施例４の撮影距離無
限遠の時の収差図。第３図、第７図、第１１図お
よび第１５図は各々実施例１、実施例２、実施例
３および実施例４の撮影距離1000の時のレンズ断
面図。第４図、第８図、第１２図および第１６図
は各々実施例１、実施例２、実施例３および実施
例４の撮影距離1000の時の収差図。
1, 5, 9, and 13 are cross-sectional views of lenses of Example 1, Example 2, Example 3, and Example 4 when the photographing distance is infinite. FIG. 2, FIG. 6, FIG. 10, and FIG. 14 show Example 1, respectively.
FIG. 4 is an aberration diagram when the imaging distance is infinite in Example 2, Example 3, and Example 4. FIG. 3, FIG. 7, FIG. 11, and FIG. 15 are cross-sectional views of lenses of Example 1, Example 2, Example 3, and Example 4 at an imaging distance of 1000, respectively. FIG. 4, FIG. 8, FIG. 12, and FIG. 16 are aberration diagrams of Example 1, Example 2, Example 3, and Example 4 at an imaging distance of 1000, respectively.
Claims (1)
ンズ群、第３発散レンズ群より構成し、レンズ系
全体としての焦点距離をＦ、前記第１収束レンズ
群、第２発散レンズ群の各焦点距離を各々f1、f2
とし、無限遠合焦状態における第１収束レンズ群
の像側主点と第２発散レンズ群の物体側主点との
間隔をｅとするとき、 (1) 0.15＜ｆ１−ｅ／｜ｆ２｜ (2) 1.0＜｜ｆ２｜／Ｆ＜4.5 但しf2＜０ の条件を満足するとともに、前記第２発散レンズ
群を光軸上像側に移動することによつて、より近
距離の物体への合焦を行なうことを特徴とする望
遠レンズ。 ２ 前記第２発散レンズ群の最も物体側の面の曲
率半径をｒF、曲率半径の符号が負で最も強い正
の屈折力をもつ面の曲率半径をｒRとしたとき 0.1＜ｒＲ／ｒＦ＜0.8 の条件を満たすことを特徴とする特許請求の範囲
第１項記載の望遠レンズ。 ３ 前記第３発散レンズ群の焦点距離をf3とした
とき、 ｜f2｜＞｜f3｜ 但しf2＜０、f3＜０ の条件を満たすことを特徴とする特許請求の範囲
第１項又は第２項記載の望遠レンズ。[Claims] 1. Consisting of a first converging lens group, a second diverging lens group, and a third diverging lens group from the object side, the focal length of the entire lens system is F, the first converging lens group, the first converging lens group, and the third diverging lens group. Let the focal lengths of the two diverging lens groups be f 1 and f 2 respectively.
When the distance between the image-side principal point of the first converging lens group and the object-side principal point of the second diverging lens group in the infinity focused state is e, (1) 0.15<f 1 -e/|f. 2 | (2) 1.0<|f 2 |/F<4.5 However, by satisfying the condition of f 2 <0 and moving the second diverging lens group toward the image side on the optical axis, it is possible to achieve a closer distance. A telephoto lens that focuses on an object. 2 When the radius of curvature of the surface closest to the object side of the second diverging lens group is r F , and the radius of curvature of the surface with a negative sign and the strongest positive refractive power is r R , 0.1<r R / The telephoto lens according to claim 1, characterized in that it satisfies the condition r F <0.8. 3. When the focal length of the third diverging lens group is f 3 , |f 2 | > | f 3 | where f 2 <0, f 3 <0 is satisfied. The telephoto lens according to item 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17344281A JPS5875107A (en) | 1981-10-29 | 1981-10-29 | Telephoto lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17344281A JPS5875107A (en) | 1981-10-29 | 1981-10-29 | Telephoto lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5875107A JPS5875107A (en) | 1983-05-06 |
| JPS6132650B2 true JPS6132650B2 (en) | 1986-07-28 |
Family
ID=15960542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17344281A Granted JPS5875107A (en) | 1981-10-29 | 1981-10-29 | Telephoto lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5875107A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59214008A (en) * | 1983-05-19 | 1984-12-03 | Asahi Optical Co Ltd | Telephoto lens |
| JPH0240606A (en) * | 1988-07-30 | 1990-02-09 | Asahi Optical Co Ltd | Telephotographic lens |
| JP3505099B2 (en) * | 1999-02-04 | 2004-03-08 | ペンタックス株式会社 | Medium telephoto lens |
| JP5749629B2 (en) * | 2011-11-01 | 2015-07-15 | 株式会社タムロン | Inner focus telephoto lens |
| JP6133068B2 (en) | 2013-01-30 | 2017-05-24 | カンタツ株式会社 | Imaging lens |
| JP6167348B2 (en) * | 2013-09-11 | 2017-07-26 | カンタツ株式会社 | Imaging lens |
| JP6434352B2 (en) * | 2015-03-30 | 2018-12-05 | 株式会社タムロン | Inner focus lens |
| TWI629535B (en) | 2017-02-18 | 2018-07-11 | 大立光電股份有限公司 | Image capturing optical system, image capturing device and electronic device |
| JP6377234B1 (en) * | 2017-10-19 | 2018-08-22 | エーエーシー テクノロジーズ ピーティーイー リミテッドAac Technologies Pte.Ltd. | Imaging optical lens |
| JP6378822B1 (en) * | 2017-10-19 | 2018-08-22 | エーエーシー テクノロジーズ ピーティーイー リミテッドＡａｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｐｔｅ．Ｌｔｄ． | Imaging optical lens |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5030456B2 (en) * | 1971-10-01 | 1975-10-01 | ||
| JPS6032848B2 (en) * | 1977-06-21 | 1985-07-30 | キヤノン株式会社 | Photographic lens with good focusing operability |
-
1981
- 1981-10-29 JP JP17344281A patent/JPS5875107A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5875107A (en) | 1983-05-06 |
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