JPH01160427U - - Google Patents
Info
- Publication number
- JPH01160427U JPH01160427U JP5477488U JP5477488U JPH01160427U JP H01160427 U JPH01160427 U JP H01160427U JP 5477488 U JP5477488 U JP 5477488U JP 5477488 U JP5477488 U JP 5477488U JP H01160427 U JPH01160427 U JP H01160427U
- Authority
- JP
- Japan
- Prior art keywords
- finder
- optical system
- mirror
- lens
- objective 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
- 230000003287 optical effect Effects 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 claims 1
- 239000011347 resin Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
- 229910052709 silver Inorganic materials 0.000 claims 1
- 239000004332 silver Substances 0.000 claims 1
- 238000007740 vapor deposition Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 101100498160 Mus musculus Dach1 gene Proteins 0.000 description 1
Landscapes
- Viewfinders (AREA)
Description
第１図は本考案の一実施例を示すフアインダー
光学系の概略構成図、第２図は反射ミラーとダハ
ミラーによる専有スペースの違いを示す図、第３
図は接眼レンズ側にペンタプリズムを用いた場合
の光路長の伸長を示す図、第４図はダハミラーの
一実施例を示す図、第５図はダハミラーの別の実
施例を示す図、第６図は２回反射ミラーの一実施
例を示す図、第７図は２回反射ミラーの別の実施
例を示す図、第８図はポリプリズムを用いた従来
のフアインダー光学系の概略構成図である。
１……対物レンズ、２……ダハミラー、３……
コンデンサーレンズ、４……ミラー部、５……接
眼レンズ。
Fig. 1 is a schematic configuration diagram of a finder optical system showing an embodiment of the present invention, Fig. 2 is a diagram showing the difference in the exclusive space between a reflection mirror and a roof mirror, and Fig. 3
The figures show the extension of the optical path length when a pentaprism is used on the eyepiece side, Figure 4 shows one embodiment of the roof mirror, Figure 5 shows another embodiment of the roof mirror, and Figure 6 shows the extension of the optical path length when a pentaprism is used on the eyepiece side. The figure shows one embodiment of a twice-reflecting mirror, FIG. 7 shows another embodiment of a twice-reflecting mirror, and FIG. 8 is a schematic diagram of a conventional finder optical system using a polyprism. be. 1...Objective lens, 2...Dach mirror, 3...
Condenser lens, 4...mirror section, 5...eyepiece lens.
Claims (1)
ー光学系用の対物レンズと、 対物レンズと対物レンズによつて結像されるフ
アインダー像との間に入射光束を９０°折り曲げ
るよう設置したダハミラーと、 フアインダー像面近傍に設けられたコンデンサ
ーレンズと、 フアインダー像を２回反射により２７０°折り
曲げるミラー部と、 フアインダー像を拡大する接眼レンズと、 を備えたことを特徴とするフアインダー光学系。 ２ 前記ダハミラーは樹脂成型品であり、アルミ
または銀の蒸着による表面反射を利用することを
特徴とする請求項１記載のフアインダー光学系。 ３ 前記ダハミラーとしてダハ付プリズムの裏面
反射を利用することを特徴とする請求項１記載の
フアインダー光学系。 ４ 前記ミラー部としてプリズムの裏面反射を利
用することを特徴とする請求項１記載のフアイン
ダー光学系。 ５ 前記ミラー部は裏面反射を行うプリズムであ
り、前記対物レンズのフアインダー像面近傍の面
をコンデンサー面とし、ミラー部とコンデンサー
レンズを一体的に構成したことを特徴とする請求
項１記載のフアインダー光学系。[Claims for Utility Model Registration] 1. An objective lens for a finder optical system that has an angle of view equivalent to that of a photographic lens, and an incident light beam that is transmitted by 90° between the objective lens and a finder image formed by the objective lens. It is characterized by comprising: a roof mirror installed so as to be bent; a condenser lens provided near the finder image plane; a mirror portion that bends the finder image by 270° by reflecting it twice; and an eyepiece lens that magnifies the finder image. Finder optical system. 2. The finder optical system according to claim 1, wherein the roof mirror is a resin molded product and utilizes surface reflection caused by vapor deposition of aluminum or silver. 3. The finder optical system according to claim 1, wherein the roof mirror utilizes back reflection of a prism with a roof. 4. The finder optical system according to claim 1, wherein the mirror section utilizes back reflection of a prism. 5. The finder according to claim 1, wherein the mirror section is a prism that performs backside reflection, a surface near the finder image plane of the objective lens is a condenser surface, and the mirror section and the condenser lens are integrally configured. Optical system.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5477488U JPH01160427U (en) | 1988-04-22 | 1988-04-22 | |
| US07/341,693 US5130855A (en) | 1988-04-22 | 1989-05-21 | Viewfinder optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5477488U JPH01160427U (en) | 1988-04-22 | 1988-04-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01160427U true JPH01160427U (en) | 1989-11-07 |
Family
ID=31280687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5477488U Pending JPH01160427U (en) | 1988-04-22 | 1988-04-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01160427U (en) |
-
1988
- 1988-04-22 JP JP5477488U patent/JPH01160427U/ja active Pending
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