JPS5886612U - Finder optical system - Google Patents
Finder optical systemInfo
- Publication number
- JPS5886612U JPS5886612U JP18417581U JP18417581U JPS5886612U JP S5886612 U JPS5886612 U JP S5886612U JP 18417581 U JP18417581 U JP 18417581U JP 18417581 U JP18417581 U JP 18417581U JP S5886612 U JPS5886612 U JP S5886612U
- Authority
- JP
- Japan
- Prior art keywords
- finder
- optical system
- image
- finder image
- lens
- 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
Landscapes
- Viewfinders (AREA)
- Telescopes (AREA)
- Lenses (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は本考案の光学系の概略図を示す。第２゜３、
４． ５図は本考案の数値実施例１．ρ、３゜４に各々
対応するレンズ断面図、第６． ７． ８゜９図は本考
案の数値実施例１． ２． ３． ４に各々対応する収
差図である。図中の収差図においてａは撮影系広角端、
ｂは撮影望遠端に対応する。
１は撮影系前群、２はハーフプリズム、３は撮影系後群
、４はフィルム面、５は対物レンズ、６は全反射ミラー
、７は集光レンズ、８は第１のファインダー像が結像す
る１次結像面、９は負レンズ、１０は正立レンズ、１１
は負レンズ、１２は第２のファインダー像が結像する２
次結像面、１３は集光レンズ、１４は接眼レンズである
。FIG. 1 shows a schematic diagram of the optical system of the present invention. 2nd degree 3rd
4. Figure 5 shows numerical example 1 of the present invention. Lens sectional views corresponding to ρ, 3°4, 6th. 7. Figure 8.9 shows numerical example 1 of the present invention. 2. 3. FIG. 4 is an aberration diagram corresponding to No. 4, respectively. In the aberration diagram in the figure, a is the wide-angle end of the imaging system;
b corresponds to the telephoto end. 1 is the front group of the photographing system, 2 is the half prism, 3 is the rear group of the photographing system, 4 is the film surface, 5 is the objective lens, 6 is the total reflection mirror, 7 is the condensing lens, and 8 is the first finder image formed. Primary imaging plane to image, 9 is a negative lens, 10 is an erecting lens, 11
is a negative lens, and 12 is 2 where the second finder image is formed.
13 is a condensing lens, and 14 is an eyepiece lens.
Claims (4)
像を正立結像系により第２のファインダー像に変換し該
第２のファインダー像を接眼レンズ系で観察するファイ
ンダー光学系において、前記正立結像系は前記第１のフ
ァインダー像と前記第２のファインダー像との間に向い
合った２つの負レンズを有している千とを特徴とするフ
ァインダー光学系。 ′−(1) In a finder optical system that converts a first finder image formed by an objective lens into a second finder image by an erecting imaging system and observes the second finder image with an eyepiece system, the erecting A finder optical system characterized in that the imaging system has two negative lenses facing each other between the first finder image and the second finder image. ′−
前記第１のファインダー像と前記第２のファインダー像
の近傍に配置した事を特徴とする実用新案登録請求の範
囲第１項記載のファインダー光学系。(2) The two negative lenses have substantially the same shape and are arranged near the first finder image and the second finder image, respectively, as described in claim 1 of the utility model registration claim. finder optical system.
像の近傍に正の屈折力を有する集光レンズを有し
ている事を特徴とする実用新案登録請求の範囲第１項記
載のファインダー光学系。(3) The eyepiece lens system is the second finder 7.
The finder optical system according to claim 1, which is a utility model, and includes a condenser lens having positive refractive power near the image.
負レンズとの間隔を０ＩＦＦ％該負レンズの焦点距離を
ｆＩＦＦとし、前記第２のファインダー像とその近傍に
配置した負レンズとの間隔を０゜い該負レンズの焦点距
離をｆ２ＦＦとしたとき３．５ ＜ Ｉ ｆｔＢＦ／Ｄ
ｚｗ ｌ ＜２５（但しｆｉＦＦ＜の３．５ ＜ ｌ
ｆ２ＦＦ／Ｄ２ｉｙ ｌ ＜２５（但しｆ２ＦＦ（０）
なる条件を満足することを特徴とする実用新案登録請求
の範囲第１項記載のファインダー光学系。(4) The distance between the first finder image and the negative lens placed near it is 0IFF%, the focal length of the negative lens is fIFF, and the distance between the second finder image and the negative lens placed near it When the focal length of the negative lens with 0° is f2FF, 3.5 < I ftBF/D
zw l <25 (however, fiFF<3.5 < l
f2FF/D2iy l <25 (however, f2FF(0)
A finder optical system according to claim 1, which satisfies the following conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18417581U JPS5886612U (en) | 1981-12-09 | 1981-12-09 | Finder optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18417581U JPS5886612U (en) | 1981-12-09 | 1981-12-09 | Finder optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5886612U true JPS5886612U (en) | 1983-06-11 |
Family
ID=29984104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18417581U Pending JPS5886612U (en) | 1981-12-09 | 1981-12-09 | Finder optical system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5886612U (en) |
-
1981
- 1981-12-09 JP JP18417581U patent/JPS5886612U/en active Pending
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