JPS5974532A

JPS5974532A - Camera having auto-focusing device

Info

Publication number: JPS5974532A
Application number: JP18577682A
Authority: JP
Inventors: Hiroshi Mito; 宏水戸
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-10-21
Filing date: 1982-10-21
Publication date: 1984-04-27

Abstract

PURPOSE:To realize a compact auto-focus camera without adopting the triangular distance measuring system, by providing a thin plate-shaped prism, whose junction face is a half mirror closely to the front of an aperture, and reflecting a branched light in the thin plate-shaped prism plural times, and leading the result to a focus detector. CONSTITUTION:A behind shutter incorporating an aperture device is provided at the rear of a lens system 1 which is movable in the direction of the optical axis, and a thin plate-shaped prism 4 whose junction face 5 is a half mirror is provided closely to the front of the aperture. A part of the optical image incident from the direction of the optical axis is reflected plural times in the reflective prism 4 and reaches the upper end and reaches an auto-focus module 6 from the end 7 of the prism. The device is so constituted that the optical image branched by the half mirror 5 is focused on the auto-focus module 6 when the image is focused on a film surface 3 by the lens system 1.

Description

【発明の詳細な説明】本発明は一眼レフ式でないコンパシトカメラにＴＴＬ式
のコントラスト検出式等の三角測距方式でない合焦検出
装置を用ひた自動焦点式カメラを提供するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides an autofocus camera that uses a non-triangular focusing detection device such as a TTL contrast detection type in a non-single-lens reflex compact camera.

図面は本発明の要部の断面を示すもので（１）置が組込
まれている。The drawing shows a cross section of the main part of the present invention, and (1) is incorporated therein.

（３）杜フィルム面であって（４）は薄板状のプリズム
でその接合面（５）はノ・−フミラーになっていて光軸
方向から入射した光像の一部を反射しプリズム内で全反
射をしながら上端に達しプリズム端（７）よりコントラ
スト検出又は小プリズムによる二重像合致式等の三角（
１１す踏力式でないオートフォーカスモジュール（６）
に達する様にしてあってレンズ系（１）によって像がフ
ィルム面上に合焦点する時ハーフミラ−（５）で分岐し
た光像がオートフォカスモジュール上に合焦点する様に
しである。(3) Mori film surface (4) is a thin plate-like prism, and its joint surface (5) is a nof mirror that reflects a part of the light image incident from the optical axis direction. The triangular (
11 Non-tread force type autofocus module (6)
When the image is focused on the film surface by the lens system (1), the optical image split by the half mirror (5) is focused on the autofocus module.

撮影に際してはレンズ系（１）を無限遠の位置から近距
離の撮影の位置或いは近接位置から無限遠の撮影の位置
に移動させその途中に於てオートフォーカスモジュール
（６）にて合焦点が検出された時モジュール（６）の電
気信号によって従来の自動焦点式カメラに於て多く用ひ
られている公知の方法によって電気回路を経てマグネッ
トを作用させレンズ系の移動を停止しその後シャッター
（２）を作動させて撮影を行ふものである。When photographing, the lens system (1) is moved from an infinity position to a close-range photography position or from a close-up position to an infinity photography position, and the in-focus point is detected by the autofocus module (6) along the way. When the lens system is moved, an electric signal from the module (6) activates a magnet through an electric circuit to stop the movement of the lens system, using a well-known method commonly used in conventional autofocus cameras, and then the shutter (2) The camera is operated to take pictures.

以上の如き本発明の装置を有するカメラは従来の三角測
距方式のカメラに於ける採光窓を２つ設ける必を等が無
くなるので余分の空間を除き得るので構造が簡単となり
且小型し得る利益を与えるものである。The camera having the device of the present invention as described above eliminates the need to provide two lighting windows in the conventional triangular distance measuring camera, thereby eliminating unnecessary space, resulting in a simple structure and the advantage of being compact. It gives

[Brief explanation of the drawing]

図面は本発明の詳細な説明するものであって図面中（１）・・・・・・レンズ系　　　　（２）・・・・・
・ビノゾンドシャノタ−（５）・・・・・フィルム面　
　　（４）・・・・・・薄板型プリズム（５）・・・・
・・ハーフミラ一部　（６）・・・・・・オートフォー
内スモシュール（７）・・・・・・プリズムＱ光の出口手続補正書昭和Ｓ７年ノ２月２乙日特許庁長官　殿１、事件の表示　昭和５７年特願第１８５７７６号３、
補正する者　事件との関係　特許出願人補正の対象６、補正の対称　明細書中特許請求の範囲の欄及２、特
許請求の範囲紋りの前面に近接して接合面をハーフミラ−とした薄板
状プリズムを設けその分岐先組う３、発明の詳細な説明の欄１頁　下から２行の末尾に次の字句を追加する「又は一
部がミラー」の８字追加２頁　最上行の５プリズム内で全反肘云々８とあるのを
５プリズム内で複数回全反射云々８と″複数回、の３字を追加する２頁　上から８行と９行の間に次の字句を追加する。上記の如く薄いプリズム内で分岐光を複数回反射させる
理由は薄いプリズムで直角に近い角度で反射させると光
軸より僅かに傾いた光線はプリズム側面で有害な方向に
反射し分岐光と似た方向性を有してゴーストの原因とな
るので之を除く為ブリズム接合面の反射面の角度を４５
度より小さくしてプリズム壁面の反射を利用するのであ
るが所要のプリズムの光の出口位置を（［ｆる為にはプ
リズムが薄い場合複数回の反射が必要となるのである。以　　−ＬThe drawings provide a detailed explanation of the present invention, and include (1)... Lens system (2)...
・Vinozon de Chateautar (5)・・・Film surface
(4)・・・Thin plate prism (5)・・・
・・Part of half mirror (6)・・・・Smoseur in autofour (7)・・・Exit procedure amendment document for prism Q light February 2, 1937, Director General of the Patent Office, 1. Indication of the case: 1982 Patent Application No. 185776 3,
Person making the amendment Relationship to the case Patent applicant Subject of amendment 6, Subject of amendment Claims column and 2 in the specification, Claims A thin plate with a half-mirror joint surface close to the front side of the emblem 3. Detailed description of the invention section, page 1. Add the following phrase to the end of the bottom two lines. Add 8 characters for "or partially mirror" on page 2. 5 on the top line. Add the following words between lines 8 and 9 from the top on page 2. As mentioned above, the reason why split light is reflected multiple times within a thin prism is that if the thin prism reflects the light at an angle close to a right angle, the light rays slightly tilted from the optical axis will be reflected in a harmful direction on the side of the prism and become branched light. Since they have similar directionality and cause ghosting, the angle of the reflective surface of the brism joint surface is set to 45 to eliminate this.
In order to make the exit position of the prism smaller than the required prism exit position, multiple reflections are required if the prism is thin.Hereinafter -L

Claims

[Claims]

A camera with an autofocus device that has a thin prism with a half mirror close to the front side of the shutter and aperture in close proximity, and a focus detection device on the branched optical path.