JPH03129935U

JPH03129935U -

Info

Publication number: JPH03129935U
Application number: JP3853190U
Authority: JP
Priority date: 1990-04-12
Filing date: 1990-04-12
Publication date: 1991-12-26

Description

[Brief explanation of drawings]

第１図は、この考案に係るカメラの絞り制御装
置の一実施例の全体構成を示すブロツク図、第２
図は、同上実施例に適用されるシヤツタユニツト
の外観斜視図、第３図は、同上実施例の絞り変更
動作の流れを示すフローチヤート、第４図は、従
来の通常撮影モードとこの考案によるシヤツタ優
先撮影モード時の開口特性図、第５図ａは、この
考案のカメラの絞り制御装置により絞り制御を行
う場合の絞り兼用シヤツタ羽根の開口部が開いて
から閉じるまでの中間で絞り開口値を変化させた
場合の開口特性図、第５図ｂは、この考案のカメ
ラの絞り制御装置により絞り兼用シヤツタ羽根の
開口部が開いてから閉じるまでの比率が１：３の
場合の開口特性図、第６図ａは、第４図ａに対応
するシヤツタスピード優先撮影モード時の動作を
説明するための開口特性図第６図ｂ〜ｇは、第６
図ａの開口特性を得る場合のタイムチヤート、第
７図ａないし第７図ｃは、それぞれこの考案のカ
メラの絞り制御装置により段階状に変化させる場
合の開口特性図、第８図は、従来のカメラの絞り
制御装置による通常のプログラム撮影モード時の
開口特性図、第９図は、従来のカメラの絞り制御
装置によりステツプモータを全開以前に停止させ
て絞り開口値を変化させる場合の開口特性図であ
る。１……シヤツタユニツト、２……測光手段、３
……測距手段、４……ＣＰＵ、５……操作スイツ
チ、５ａ……モード切換スイツチ、６……ＤＸ読
取手段、８……ステツプモータ、９……シヤツタ
トリガスイツチ、１１……開口部、１１ａ，１１
ｂ……絞り兼用シヤツタ羽根、１２……レバー、
１３……駆動ギヤ、１５……レバー戻し用スプリ
ング。 FIG. 1 is a block diagram showing the overall configuration of an embodiment of a camera aperture control device according to this invention, and FIG.
The figure is an external perspective view of the shutter unit applied to the above embodiment, FIG. 3 is a flowchart showing the flow of the aperture changing operation in the above embodiment, and FIG. 4 is a conventional normal shooting mode and a shutter unit according to this invention. The aperture characteristic diagram in the priority shooting mode, Fig. 5a, shows the aperture aperture value in the middle from when the aperture of the shutter blade that also serves as an aperture opens until it closes when the aperture control device of the camera of this invention performs aperture control. Fig. 5b is an aperture characteristic diagram when the ratio from when the aperture of the shutter blade that also serves as an aperture is opened to when it is closed by the aperture control device of the camera of this invention is 1:3. FIG. 6a is an aperture characteristic diagram for explaining the operation in the shutter speed priority shooting mode corresponding to FIG. 4a. FIGS.
Figure 7a to 7c are time charts for obtaining the aperture characteristic shown in Figure a, Figures 7a to 7c are respectively aperture characteristic diagrams for changing the aperture characteristic stepwise by the aperture control device of the camera of this invention, and Figure 8 is the conventional one. Figure 9 shows the aperture characteristics when the aperture control device of a conventional camera is used to change the aperture opening value by stopping the step motor before it is fully opened. It is a diagram. 1...Shutter unit, 2...Photometering means, 3
... Distance measuring means, 4 ... CPU, 5 ... Operation switch, 5a ... Mode changeover switch, 6 ... DX reading means, 8 ... Step motor, 9 ... Shutter trigger switch, 11 ... Opening , 11a, 11
b...Shutter blade that also serves as an aperture, 12...Lever,
13... Drive gear, 15... Lever return spring.

Claims

[Scope of utility model registration request]

In a camera aperture control device that controls the aperture of a shutter blade that also serves as an aperture and is driven to open and close by forward and reverse rotation of a step motor, the shutter blade is programmed with a predetermined aperture and shutter speed according to photometry information, film sensitivity information, etc. control, and it is possible to stop the shutter blades that also serve as the diaphragm at a position other than fully open, and
A control circuit capable of controlling the aperture aperture by changing the aperture shutter blade temporarily stopped at a certain aperture position to another aperture position one or more times before closing the aperture shutter blade, and an operation switch for controlling the aperture aperture. An aperture control device for a camera, characterized in that the control circuit is configured to execute the aperture aperture control in place of program control by operating the operation switch.