JPS5924802A - Pentagonal prism - Google Patents

Pentagonal prism

Info

Publication number
JPS5924802A
JPS5924802A JP13474682A JP13474682A JPS5924802A JP S5924802 A JPS5924802 A JP S5924802A JP 13474682 A JP13474682 A JP 13474682A JP 13474682 A JP13474682 A JP 13474682A JP S5924802 A JPS5924802 A JP S5924802A
Authority
JP
Japan
Prior art keywords
face
prism
light
incident
light beam
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
Application number
JP13474682A
Other languages
Japanese (ja)
Inventor
Hideo Shizume
鎮目 秀雄
Takeshi Kitamura
猛 北村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP13474682A priority Critical patent/JPS5924802A/en
Publication of JPS5924802A publication Critical patent/JPS5924802A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/04Prisms

Abstract

PURPOSE:To prevent the stray light in a pentagonal prism and to reduce the size thereof by forming the incident face of the pentagonal prism formed of a plastic so as to project from the extension face of the 2nd reflection face. CONSTITUTION:A projecting part 5 is provided in order to provide the incident face 1 of a prism so as to project outward from the extension face of the 2nd reflection face 3. A coated film for light absorption is provided on the part 5 and the face 6 opposed to the side face of the projecting part. Then the light beam which is made incident between light beam (a) and light beam (b) and the light beam between ray (c) and light beam (d) are totally reflected by the face 1 and are then made incident to a coated film 6 for light absorption, by which the light beams are absorbed. Problems such as an increase in the size over the entire part and the need for pasting the parallel flat plates corresponding to the projecting part arise in providing such projecting incident face to the prism of glass. Therefore, if the prism is formed of a plastic, the prism having a small size and an effect for preventing stray light is easily produced.

Description

【発明の詳細な説明】 本発明は迷光ン:除去するため、入射ir+7を従来υ
もυと変えたペンタプリズム、IP!j lこプラスチ
ックで成形されたペンタプリズム1こ関する。
DETAILED DESCRIPTION OF THE INVENTION In order to remove stray light, the present invention replaces the incident ir+7 with the conventional υ
Pentaprism changed to υ, IP! Contains one pentaprism molded from plastic.

−眼レフ等;こ利用されるペンタプリズムは、従来、ガ
ラスブロックを研IMシてIII!J作され、そυ側面
図は第1図υような形状となっている。
- Eye reflex camera, etc.; Conventionally, the pentaprism used is made by grinding a glass block. It was made by J, and its side view has the shape shown in Figure 1.

ピントグラス1こ而する入射面lがも入射した元け1曲
常屋根貼反射面となっている第1反射面2で反射し、第
2反射面3で反射した後、出射面4から出射する。こυ
ようなプリズムにおいては、第1図中1こa、b% c
、dでそυ光路を示すように、第1反射面2で反射後、
第2反射面37)入射面11こ近い部6γtこ大きい入
射角で入射する光線は、入射面1で更1こ全反射した後
、出射面4から1jj射し、視ψを中1ごゴーストをr
「る原因となる。
The incident surface L of the focusing glass 1 is also reflected from the first reflecting surface 2, which is a reflective surface covered with a roof, and after being reflected from the second reflecting surface 3, the light is emitted from the output surface 4. do. This υ
In a prism like this, 1 koa, b% c in Fig. 1
, d shows the optical path of υ, after reflection from the first reflecting surface 2,
2nd reflective surface 37) The light ray that enters at a larger angle of incidence near the entrance surface 11 undergoes an additional total reflection at the entrance surface 1, and then exits from the exit surface 4 by 1jj, causing a ghost in the visual field ψ. r
``It causes

本発明[ま、こりようなペンタプリズム中υ迷)Y、を
除去するため、入射面を第2反射面υ延長面から突出し
て形成したもっである。
In the present invention, the incident surface is formed to protrude from the second reflecting surface υ extension surface in order to eliminate the υ error in the pentaprism.

以下図面を参1潰して詳細)こ説明する。The details will be explained below with reference to the drawings.

第2図)こ示ずよう1こ、プリズム入射面1を。Figure 2) This shows the prism entrance surface 1.

第2反射面3υ蝿長而から外(こ突出して設けるため、
突出1祁5を設けたもυである。そして突出部5及びこ
の突出部tllll而5Iこ対向する而61こ光吸収塗
膜を設ける。こυようにすtLば、図において光#’J
IBから光II(Abυ間)こ入射する光線。
The second reflective surface 3υ is provided so as to protrude from the length.
Even if the protrusion 1 and 5 are provided, it is also υ. Then, a light-absorbing coating film is provided on the protrusion 5 and the protrusion 5I and the 61 facing the protrusion. If we do this υ, then in the diagram light #'J
A ray of light enters from IB to light II (between Abυ).

及び光線Cから光6u d 7) IIJIに入射する
光40は。
and light 6u d 7) from ray C. The light 40 incident on IIJI is.

入射面1で全反射した後、光吸(区塗膜6に入射し吸!
区ざ1することとなる。
After total reflection on the incident surface 1, the light is absorbed (injects into the coating film 6 and is absorbed!
It will be divided into 1 areas.

9を来、ガラスによるペンタプリズムは、ガラスブロッ
ク管研牟[2て製作するため、プリズムυ入射面12)
端縁μ第2反射面27)砥長面から突出した形1こ製造
すること脣1ψ1t(7い。こυためプリズム形状を下
方)こ伸ばした形とし、マウンi・用切欠7を大きくす
ること1こよっても同1求υ幼果を舟ることけ出1(る
が、そうすると、入射面1v必間な大きさ′f確医する
ため1こμ第1図中1こ点ηIil″c示すよう1こプ
リズム全体をに、型化しなけ/1ばならないという間明
全生ずる。
9, the pentaprism made of glass is manufactured using a glass block tube [2, so the prism υ entrance surface 12]
Edge μ second reflective surface 27) Make a shape that protrudes from the long surface of the whetstone. 脣1ψ1t (7. Therefore, the prism shape is extended downward) and the notch 7 for the mount i is made larger. In order to determine the necessary size of the incident surface 1v, we need 1 point ηIil'' in Figure 1. It is obvious that the entire prism must be made into a mold as shown in c.

こつ問題を)な?決するlこ1.L、ベンタグリズムを
ガラスで製作J−る1箱合は、突出部1こ([1当する
51′行甲板全プリズJ−■入射面11こプロ学的1こ
貼合tて作ることが出来る。
What's the trick? Decide 1. L. Manufacturing Ventagrism with glass J- 1 box assembly is made by attaching 1 protruding part (1 51' row deck whole prism J-■ entrance surface 11 and 1 protruding part) I can do it.

しか1〜、こυ方法1よhts品点数も増し、製作上(
呈も11V4イIB!:lrす、プリズムOコスト」−
月υため一般1こ利用rる1こけ難点がある。
However, method 1 also increases the number of products, making it difficult to manufacture (
Presentation is also 11V4 IIB! :lr, prism O cost”-
There is a drawback to general use because of the month.

そったV)、lト発明υプリズムt、[、プラスチック
で成形するυが望ましい。グラスチックで成形すttば
、上記突出部をプリズム本体と同時に成形出来るっで、
小型で、迷光防止効果ケ時クズリズムを容易1こ低コス
トで製造することが出来る。
It is desirable that the prism be molded from plastic. If you mold it with glass, you can mold the protrusion part at the same time as the prism body.
With its small size and stray light prevention effect, Kuzurism can be easily manufactured at a lower cost.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図1:j、従来つペンタグリズム中υ迷光光路図、
第2図は本発明り)プリズム中υ迷光光路図1:入射而
 3:第2反射面 5:突出部6;陽光塗膜 +1’、’?管出出1.i’人   小;J(1六写れ
:[蟻沫代会肚出顆人代1.1人 弁明!:I:  V
iX+雨  文  男(ほか1名) ・ゝj’j    I    1/1 手  続  袖  正  惰 c方式)%式% rpυfl−庁長官 若  杉  ズ11   夫 殿
■、 小作の表示 +11(′J1157 ’jIF4¥lri[ig +
 3474 fi 号2 発明の名1ヂエ、 ペンタプリズム 8、補1Eをずみ者 事件との関係  特γ「出願人 4、代理人〒105 (発送日 昭和574[10月26[旧6、補正の対象
  明細書の「発明の詳細な説明jの(閘7、補正の内
容  明紹l′19第1頁第8行「発明の名称」を[発
明の詳細な説明]圧補正する。
Figure 1: j, conventional pentagrism υ stray light optical path diagram,
Figure 2 shows the optical path of υ stray light in the prism (Fig. 2 shows the present invention) Figure 1: Incident 3: Second reflective surface 5: Projection 6; Sunlight coating +1','? Tube exit 1. i' person small;
iX + Ame Fumi (1 other person) ・ゝj'j I 1/1 Procedure Sode Tadashi c method) % formula % rpυfl- Agency Director Wakasugi Zu11 Husband ■, Display of tenant work +11 ('J1157 'jIF4 ¥lri [ig +
3474 fi No. 2 Name of the invention 1 Jie, Pentaprism 8, Supplement 1E Relation to the person's case Special gamma Applicant 4, agent 〒105 (Shipping date October 26, 1989 [formerly 6, subject of amendment) Amend ``Title of the Invention'' on page 1, line 8 of ``Detailed Description of the Invention'' in the specification (Box 7, Contents of Amendment) to [Detailed Description of the Invention].

Claims (1)

【特許請求の範囲】[Claims] 入射面が、第2反射面υ延艮面より外1こ扼出して設置
lられていることを特@ 、!:するベンタフ”リズム
It is especially important to note that the incident surface is set one inch further out from the second reflecting surface. :Suru Bentuff” Rhythm
JP13474682A 1982-08-03 1982-08-03 Pentagonal prism Pending JPS5924802A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13474682A JPS5924802A (en) 1982-08-03 1982-08-03 Pentagonal prism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13474682A JPS5924802A (en) 1982-08-03 1982-08-03 Pentagonal prism

Publications (1)

Publication Number Publication Date
JPS5924802A true JPS5924802A (en) 1984-02-08

Family

ID=15135608

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13474682A Pending JPS5924802A (en) 1982-08-03 1982-08-03 Pentagonal prism

Country Status (1)

Country Link
JP (1) JPS5924802A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5754336A (en) * 1995-04-28 1998-05-19 Asahi Kogaku Kogyo Kabushiki Kaisha Optical system for a real image type view finder

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5647616U (en) * 1976-05-21 1981-04-27

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5647616U (en) * 1976-05-21 1981-04-27

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5754336A (en) * 1995-04-28 1998-05-19 Asahi Kogaku Kogyo Kabushiki Kaisha Optical system for a real image type view finder

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