JPS6376815U - - Google Patents
Info
- Publication number
- JPS6376815U JPS6376815U JP16214087U JP16214087U JPS6376815U JP S6376815 U JPS6376815 U JP S6376815U JP 16214087 U JP16214087 U JP 16214087U JP 16214087 U JP16214087 U JP 16214087U JP S6376815 U JPS6376815 U JP S6376815U
- Authority
- JP
- Japan
- Prior art keywords
- lens system
- negative lens
- negative
- positive
- principal point
- 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.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims 4
- 230000005499 meniscus Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 230000004075 alteration Effects 0.000 description 2
Landscapes
- Lenses (AREA)
Description
第１図は従来の焦点距離変換の原理の説明図、
第２図は本考案の焦点距離変換の原理の説明図、
第３図は本考案の数値実施例の基準レンズのレン
ズ断面図、第４図乃至第７図は夫々本考案の実施
例１乃至実施例４に夫々対応するレンズ断面図、
第８図は本考案の数値実施例の基準レンズの諸収
差図、第９図乃至第１２図は夫々基準レンズに実
施例１乃至実施例４を付加したときの夫々の諸収
差図、
図中、Ｍはメソデイオナル像面、Ｓはサジタル
像面を示す。
Figure 1 is an explanatory diagram of the principle of conventional focal length conversion.
Figure 2 is an explanatory diagram of the principle of focal length conversion of the present invention.
FIG. 3 is a lens cross-sectional view of a reference lens according to a numerical example of the present invention, and FIGS. 4 to 7 are lens cross-sectional views corresponding to Examples 1 to 4 of the present invention, respectively.
Fig. 8 is a diagram of various aberrations of a reference lens according to a numerical example of the present invention, and Figs. 9 to 12 are diagrams of various aberrations when Examples 1 to 4 are added to the reference lens, respectively. , M indicates a methodional image plane, and S indicates a sagittal image plane.
Claims (1)
間に光軸を同じくした負の屈折力を有する負レン
ズ系を装着して焦点距離を交換する光学系であつ
て、前記負レンズ系の着脱に係わりなく前記正レ
ンズ系の軸上位置は維持し、前記負レンズ系の前
側主点は前記正レンズ系の後側主点よりも像面側
に位置し、かつ前記負レンズ系の前側主点は前記
負レンズ系の後側主点よりも像面側に位置する様
に設定し、更に前記負レンズ系は物体側より順に
正の前群と負の後群から構成し、負レンズ系の屈
折力をφ２とするとき、 φ２＋φ１φ＞１ を満足し、また前記負レンズ系の前群と後群は夫
々、少なくとも１個の発散作用をする接合面を有
し、更に前記負レンズ系のレンズ長が前記正レン
ズ系のバツクフオーカスの０．１倍より大きく０
．５倍より小さいことを特徴とする焦点距離変換
用光学系。 (2) 前記負レンズ系の正の前群は物体側より順
に物体側に凸面を有する貼合せのメニスカスレン
ズと両凸面の正レンズから成る事を特徴とする実
用新案登録請求の範囲第１項記載の焦点距離変換
用光学系。[Claims for Utility Model Registration] (1) A negative lens system with negative refractive power and having the same optical axis is installed between a positive lens system with positive refractive power and an image plane to exchange focal lengths. The optical system maintains the axial position of the positive lens system regardless of whether the negative lens system is attached or detached, and the front principal point of the negative lens system is closer to the image plane than the rear principal point of the positive lens system. , and the front principal point of the negative lens system is set to be located closer to the image plane than the rear principal point of the negative lens system, and further, the negative lens system and a negative rear group, and when the refractive power of the negative lens system is φ 2 , it satisfies φ 2 +φ 1 φ>1, and each of the front group and the rear group of the negative lens system has at least one lens. furthermore, the lens length of the negative lens system is greater than 0.1 times the back focus of the positive lens system.
．． An optical system for focal length conversion characterized by being smaller than 5 times. (2) The positive front group of the negative lens system is comprised of, in order from the object side, a laminated meniscus lens having a convex surface on the object side and a biconvex positive lens. The optical system for focal length conversion described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16214087U JPS6376815U (en) | 1987-10-22 | 1987-10-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16214087U JPS6376815U (en) | 1987-10-22 | 1987-10-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6376815U true JPS6376815U (en) | 1988-05-21 |
Family
ID=31089120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16214087U Pending JPS6376815U (en) | 1987-10-22 | 1987-10-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6376815U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006084925A (en) * | 2004-09-17 | 2006-03-30 | Fujinon Corp | Imaging lens |
| JP2010504547A (en) * | 2006-09-22 | 2010-02-12 | イギリス国 | Lens construction |
-
1987
- 1987-10-22 JP JP16214087U patent/JPS6376815U/ja active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006084925A (en) * | 2004-09-17 | 2006-03-30 | Fujinon Corp | Imaging lens |
| JP4624749B2 (en) * | 2004-09-17 | 2011-02-02 | 富士フイルム株式会社 | Imaging lens |
| JP2010504547A (en) * | 2006-09-22 | 2010-02-12 | イギリス国 | Lens construction |
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