JPS6330813U - - Google Patents
Info
- Publication number
- JPS6330813U JPS6330813U JP12375986U JP12375986U JPS6330813U JP S6330813 U JPS6330813 U JP S6330813U JP 12375986 U JP12375986 U JP 12375986U JP 12375986 U JP12375986 U JP 12375986U JP S6330813 U JPS6330813 U JP S6330813U
- Authority
- JP
- Japan
- Prior art keywords
- lens
- refractive power
- objective lens
- positive refractive
- objective
- 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
- 230000007423 decrease Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000004075 alteration Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 1
Description
第１図Ａ，Ｂは各々本考案の一実施例の変倍フ
アインダーの変倍前後の光学系の概略図、第２図
Ａ，Ｂは本考案の変倍フアインダーの変倍前後の
近軸屈折力配置を示す説明図、第３図Ａ，Ｂは本
考案の数値実施例の変倍前後の無限遠物体に対す
る諸収差図である。収差図において△Ｍはメリデ
イオナル像面、△Ｓはサジタル像面である。
図中２は対物レンズ、３はフイールドレンズ、
４はポロプリズムの展開図、５は接眼レンズ、７
は補助対物レンズである。
Figures 1A and B are schematic diagrams of the optical system before and after zooming of a variable magnification finder according to an embodiment of the present invention, and Figures 2A and B are paraxial refraction diagrams of the variable magnification finder of the present invention before and after zooming. FIGS. 3A and 3B, which are explanatory diagrams showing force distribution, are various aberration diagrams for an object at infinity before and after zooming in a numerical embodiment of the present invention. In the aberration diagram, ΔM is a meridional image plane, and ΔS is a sagittal image plane. In the figure, 2 is an objective lens, 3 is a field lens,
4 is a developed view of the Porro prism, 5 is the eyepiece, 7
is the auxiliary objective lens.
Claims (1)
眼レンズとを有し、前記対物レンズを該対物レン
ズの屈折力と異なる正の屈折力の補助対物レンズ
と交換することによりフアインダー倍率の変倍を
行つたことを特徴とする変倍フアインダー。 (2) 前記対物レンズ及び前記補助対物レンズを
レンズ中心部からレンズ周辺部にいくにつれて正
の屈折力が弱まる形状の少なくとも１つの非球面
を有する単一レンズより構成したことを特徴とす
る実用新案登録請求の範囲第１項記載の変倍フア
インダー。[Claims for Utility Model Registration] (1) It has an objective lens with a positive refractive power and an eyepiece lens with a positive refractive power, and the objective lens is used as an auxiliary objective with a positive refractive power different from the refractive power of the objective lens. A variable magnification finder characterized by changing the magnification of the finder by replacing it with a lens. (2) A utility model characterized in that the objective lens and the auxiliary objective lens are constituted by a single lens having at least one aspherical surface whose positive refractive power decreases from the center of the lens toward the periphery of the lens. A variable magnification finder according to claim 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12375986U JPS6330813U (en) | 1986-08-12 | 1986-08-12 | |
| US07/080,570 US4751539A (en) | 1986-08-12 | 1987-07-31 | Variable power finder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12375986U JPS6330813U (en) | 1986-08-12 | 1986-08-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6330813U true JPS6330813U (en) | 1988-02-29 |
Family
ID=31015155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12375986U Pending JPS6330813U (en) | 1986-08-12 | 1986-08-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6330813U (en) |
-
1986
- 1986-08-12 JP JP12375986U patent/JPS6330813U/ja active Pending
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