JPS5929201A - Pentagonal prism having fresnel lens or the like - Google Patents

Abstract

PURPOSE:To obtain an optical system which reduces cost, prevents the intrusion of dirt and has high accuracy by forming optial members such as a Fresnel lens, split image, etc. into one body thereby constituting a pentagonal prism. CONSTITUTION:A Fresnel lens face 3 and a split image 4 are formed similtaneously of a plastic under pressure on the light incident face 2 of a pentagonal prism body 1. Since both are formed at one time by the integral forming, the intrusion of dirt between the prism 1 and the Fresnel lens face is prevented and since the prism and lens are unaffected by sinkage, the optical system having high accuracy is obtd.

Description

【発明の詳細な説明】 本Ｑ　Ｊｑ　＋−？フレ２・ルレンズを一体＋７１成形
したベンタブ゛ノズＬ：こ林するっ レフレックスカメラ等ｊ・こ便用６　ｔｔ　６ペンタグ
）ズム＝２“ハてｒｊ、一般もこ光υ入射面近＜１こ、
袂野醍辺Ｖ屯乳をづ弓るくするたり１こフレネノンレ／
ズをも己すする。[Detailed description of the invention] Book Q Jq +-? Bent tab nose L with 2 lenses integrally molded: 6 tt 6 pen tags for reflex cameras, etc.) Zm = 2" High rj, general light υ near incident surface <1" ,
Haruno Daibe V ton milk is made to be smooth and 1 ko Frenenonre/
I also slurp myself.

こつフレス、ルレノズ吋、そｖ１５１・Ｕ白抜７）集光
屈折口をガモス―上乙こ加工杉板することは困難であり
１便すｌ−を王２してアクリル朗雇等Ｖ会成シ噌′ｌ：
圧稈叡形せたけ射出成形して１′「られていた− 一方、ペンタプリズムは、合成樹脂１こよって成彩する
１こけ超厚肉品であり、固化収縮、熱収縮；こ伴う面精
明つ低下や内部歪１こよる脈理Ｑ発生等Ｖため、ガラス
ブロックを研磨して製作されていた。7) It is difficult to make the condensing and refracting port with a cedar board processed with Gamos-Kamiotsuko, so I made 1 piece of 2 pieces of acrylic, etc. Shi'l:
On the other hand, a pentaprism is a one-piece ultra-thick-walled product made of synthetic resin, which undergoes solidification shrinkage, heat shrinkage, and accompanying surface refinement. Because of problems such as decreased strength, internal strain, and the occurrence of striae, they were manufactured by polishing glass blocks.

こりよつ番こ、ベンタグリズムとフレネルレンズとけそ
υ素材が違っており、それぞれを別体としτａｎ−する
ほかなかったつで、そつためυコスト高１Ｊ勿論つこと
、別＃−υもＶをカメラ等に組込むためＶ間隔や光軸ず
れ７）位置υ調整。In this case, the Ventagrism and Fresnel lens are made of different materials, so I had no choice but to make each one of them separately, and because of that, the cost was high 1J. Adjustment of V interval and optical axis deviation 7) Position υ in order to incorporate into a camera, etc.

接眼ルー憚υ焦点近く１こあるため目立ち易いコミυ附
着等υ間鴫を生じていた。Because there was one eyepiece near the focal point, there were easily noticeable spots and spots between the eyes.

木兄明肴等は、ペンタフリズムりような超厚肉品であづ
ても、金型中で鵬脂を加熱溶融させて歪を除き、徐冷固
化時）こ加圧しながらキャビティ容積を縮小させること
１こよって内部歪υない蘂精匿７）成形品を得ることが
出来ることを見出した。Even if it is an ultra-thick-walled product such as a pentaphrism, the mold is heated and melted to remove distortion, and during slow cooling and solidification, the cavity volume is reduced while applying pressure. It has been found that 1) it is possible to obtain a molded product with no internal distortion 7).

本発明は、上記υ方法ｌこよってペンタプリズムを合成
樹脂で成形する部会、ぞυ光υ入射面１こフレネルレン
ズを一体として成形すること１こより、従来υよう（こ
別体として別Ｏ素材で製作することに伴って生じていた
間頑を唾で解消したペンタプリズムを１尋ようとするも
のである。The present invention utilizes the above-mentioned υ method to mold a pentaprism with synthetic resin, and molds the υ light incident surface 1 and Fresnel lens as one piece. This is an attempt to create a pentaprism that eliminates the rigidity that occurred with the production of a pentaprism.

第１図はペンタプリズム本体１７）光入射面２（コ、ヘ
ンタグリズム成形時に同時１こフレネルレンズ而３とス
プリットイメージ４を形成したもつであり、上記の加圧
成形；こよって、こつような超孝肉成形品）こありても
、いわゆる「ひけ」Ｖ影響を受けｒ、精＃ｌＩＬつ高い
プリズム反射面、フレネルレンズ１ｍ　’ｆｒ　面、ス
プリットイメージ０楔面が形成出来る。Figure 1 shows the pentaprism main body 17), the light entrance surface 2 (c), the Fresnel lens 3 and the split image 4 formed at the same time during the pentaprism molding; Even with this (super thin molded product), it is possible to form a prism reflective surface with a high precision, a Fresnel lens 1m'fr surface, and a split image 0 wedge surface due to the effect of so-called "sink" V.

第２図は、ペンタプリ′ズ台入射面υフレネルレンズ３
ど共て７ヤツタ速度、絞１直等υファインダー内衣示を
するためυ穴或は凹へ５を光学的な不作用向１こ同時ｌ
こ成形した列である。Figure 2 shows the entrance plane of the pentapris table υ Fresnel lens 3.
In both cases, the speed is 7, and the aperture is 1 orthogonal.In order to indicate the inner diameter of the υ finder, insert 5 into the υ hole or concave in an optically inactive direction.
This is the formed column.

本発明υペンタプリズムは、上記つよう１こ、フレネル
レンズ等υ光学部材を一体ｔこ成形したつで、 １）　一体成形（こより複数υ光学部材を一度）こ成ダ
ウンが実現出来る。The υ pentaprism of the present invention is made by integrally molding the above-mentioned υ optical members such as a Fresnel lens. 1) It is possible to realize integral molding (multiple υ optical members are molded at once).

＋１）　　ぺ４タブリズムとフしノネルレンズとＯ間υ
位置調整が不要であり、常１こ精度υ高い光学系が得ら
れる。+1) P4 tabism, Fushinonel lens and O υ
No position adjustment is required, and an optical system with a high accuracy of υ by 1 can be obtained.

１１１）　　ベンタグリズムと７レールレンズｅ　−Ｋ
　化するこ（！：Ｉこより、両者間ｉこ附着するファイ
ンダー内ゴミの問題が解決する。111) Ventagrism and 7 rail lens e-K
This will solve the problem of dust stuck in the viewfinder between the two.

という効果が生じる。This effect occurs.

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

第１図は本発明υペンタプリズム７）ｌ実施例υ側面図
、第２図は同じく池７）実姉例の背面図１＝ベンターソ
リズム　２：光入射面 ３：フレネルレンズ　４ニスプリントイメージ５：凹与 特杆出艶人　　小西六傅真王業味式会社出顎人代哩へ　
弁Ｉ士　咋　　藤　　文　　男（ほか１名）Figure 1 is a side view of the inventive υ pentaprism 7) l Example υ, and Figure 2 is the same pond 7) Rear view of the real sister example 1 = Ventersolism 2: Light incidence surface 3: Fresnel lens 4 Varnish print image 5 ：Konishi Rokufu Shino business style company Dejajin representative
Ben Ishi Fumi Kui Fuji (and 1 other person)

Claims (1)

【特許請求の範囲】[Claims] フレ２、ルレンズ、スプリソ）・イメージ等ｖ元学会［
材を一体゛こ呟杉１７ｔことを特徴とするフレ坏ルレン
ズ号を胃するベンタグリズムFre2, Lurenz, Spriso), Image, etc. v Gen Gakkai [
Bentagrism, which uses a full lens, is characterized by being made of 17 tons of Japanese cedar.