JPS5893919U

JPS5893919U - Aperture value information generator for automatic aperture control cameras

Info

Publication number: JPS5893919U
Application number: JP18850781U
Authority: JP
Inventors: 大倉　善市; 真介河本
Original assignee: 旭光学工業株式会社
Priority date: 1981-12-17
Filing date: 1981-12-17
Publication date: 1983-06-25

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

[Brief explanation of the drawing]

第１図は、レンズ鏡筒内の絞り機構の各部材の関係を示
す分解組立図である。第２図は、第１図に示した絞り機
構における本考案による絞り値信号発生装置の部分を、
一点鎖線で示した光軸線から見た図である。第３図は、
第１図の実施例とは別の実施例をレンズ鏡筒内に収容さ
れた状態で示す断面図である。第４図は、光ファイバの
先端を平担にしてパルサーのピッチ幅内に光を導くよう
にした状態を示す図である。第５図は、光ファイバを使
ってパルサーに光を導く実施例の概略構成図である。第
６図は、第５図とは別の実施例を示す概略構成図である
。第７図は、発光素子又は受光素子を光ファイバと一体
化して形成した状態を示す図である。第８図は、光ファ
イバを双方向で使う別の実施例を示す図である。第９図
は、自動絞り制御回路の構成を示すブロック図である。第１０図は、絞りを所定の絞り値に制止する機構の一例
を示す図である。５・・・絞り羽根、６・・・絞り開閉板、７・・・カム
−レバー、８・・・軸、１０・・・開口、１２・・・パ
ルサー、１６−・・・レリーズ板、１８・・・切欠部、
２０・・・スイングレバー、２２・・・スプリング、２
４・・・パルサー、２６．２６′・・・支持板、−２８
・・・開口、３０・・・発光素子、３２・・・発光素子
、４０・・・光ファイバ、４２・・・光ファイバ、４４
・・・直角プリズム、５２，　　５４，　　５６．５８
．６０・・・光ファイバ、６２・・・ホトインターラブ
タ、６４・・・発光素子、−６６・・・受光素子、６Ｂ
，７０・・・光ファイバ、７２，−７４・・・パルサー
、７６・・・支持台、７８・・入カライン、８０・・・
出力ライン、８２・・・波形整形回路、８４・・・計数
回路、８６・・・被写体輝度情報、Ｂ８・・・シャッタ
ー速度情報、９０・・・フイルム感度情報、９２・・・
露出倍数情報、９４・・・演算回路、９６・・・適正露
出値決定回路、９８・・・比較回路、１００・・・制動
マグネット、１０２・・・支軸、１０４・・・係止レバ
ー、１０６・・・歯車。FIG. 1 is an exploded view showing the relationship between each member of the diaphragm mechanism within the lens barrel. FIG. 2 shows the aperture value signal generating device according to the present invention in the aperture mechanism shown in FIG.
It is a view seen from the optical axis line shown by a dashed-dotted line. Figure 3 shows
FIG. 2 is a cross-sectional view showing an embodiment other than the embodiment shown in FIG. 1 housed in a lens barrel. FIG. 4 is a diagram showing a state in which the tip of the optical fiber is made flat to guide light within the pitch width of the pulsar. FIG. 5 is a schematic diagram of an embodiment in which light is guided to a pulsar using an optical fiber. FIG. 6 is a schematic configuration diagram showing a different embodiment from FIG. 5. FIG. 7 is a diagram showing a state in which a light emitting element or a light receiving element is formed integrally with an optical fiber. FIG. 8 is a diagram showing another embodiment in which the optical fiber is used bidirectionally. FIG. 9 is a block diagram showing the configuration of the automatic aperture control circuit. FIG. 10 is a diagram showing an example of a mechanism for controlling the aperture to a predetermined aperture value. 5... Aperture blade, 6... Aperture opening/closing plate, 7... Cam-lever, 8... Shaft, 10... Aperture, 12... Pulsar, 16-... Release plate, 18 ...notch,
20... Swing lever, 22... Spring, 2
4... Pulsar, 26.26'... Support plate, -28
...Aperture, 30...Light emitting element, 32...Light emitting element, 40...Optical fiber, 42...Optical fiber, 44
...Right angle prism, 52, 54, 56.58
．． 60... Optical fiber, 62... Photo interlayer, 64... Light emitting element, -66... Light receiving element, 6B
, 70... Optical fiber, 72, -74... Pulsar, 76... Support stand, 78... Input line, 80...
Output line, 82... Waveform shaping circuit, 84... Counting circuit, 86... Subject brightness information, B8... Shutter speed information, 90... Film sensitivity information, 92...
Exposure multiple information, 94... Arithmetic circuit, 96... Appropriate exposure value determination circuit, 98... Comparison circuit, 100... Braking magnet, 102... Support shaft, 104... Locking lever, 106...Gear.

Claims

[Claims for Utility Model Registration] {1) Two parts having different optical characteristics in transmission or reflection are formed alternately on the opening/closing plate that drives the aperture blades or on a member within the lens barrel that moves in the same manner as the opening/closing plate. Automatic aperture control characterized in that a light pulse generating member is sloped, pulses generated as the light pulse generating member moves are transmitted to a camera body side, and the number of pulses indicates the current aperture value. Aperture value information generator for cameras. (2) The automatic aperture control camera according to claim 1, wherein the light pulse generating member is composed of two diffraction gratings formed in a common shape. Aperture value information generator. (3) The light incident on the light pulse generating member is transmitted from the light emitting element in the camera body via the optical fiber when the lens is attached to the camera body, and the light pulse generated by the light pulse generating member is The aperture value information generating device for an automatic aperture control camera according to claim 1 or 2 of the utility model registration claim, characterized in that the information is transmitted to a light receiving element in a camera body via an optical fiber. . (4) Aperture value information for an automatic aperture control camera as set forth in claim (3) of the utility model registration claim, wherein the optical fiber has a conical shape such that the input side is thick and the output side is thin. Generator. (5) The aperture value information generating device for an automatic aperture control camera according to claim 3, wherein the end face on the input side of the optical fiber is concave and the end face on the output side is convex. .