JPS6150468A - Image pickup device - Google Patents

Abstract

PURPOSE:To keep the lightness of a picture in a finder stably until an aperture from an aperture servo is made proper by applying servo control to the exposure ahead the output of a trigger means and holding the exposure state to a constant value for a prescribed value in response to the said output. CONSTITUTION:Recording is executed in interlocking with an image pickup release switch 17 at image pickup without lighting, and in this case, the aperture is set by outputting ''H'' at a one-shot multivibrator circuit 11 for a recording time T1 only and bringing a level of a clock input CL of a latch 8 to ''L''. Since an EN input 23 remains logical H, the aperture just before a switch 17 is turned on is stored during recording and servo aperture control is restarted after the time T1. A mode changeover switch 18 is turned on at image pickup with lighting at first. In turning on the switch 17, ''H'' level is outputted from a one-shot multivibrator 13 for a time T2 (<T1), the lighting device is lighted and the level of the input 23 goes to L level to inhibit the data output from the latch 8. A lighting mode aperture control circuit 14 is turned on at the same time and a contact lighting aperture control data 24 is outputted.

Description

【発明の詳細な説明】 （技術分野） 本発明は、撮像装置、特に被写体の明るさの変化に追従
して絞り等の露出部材をサーボ制御する撮像装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an imaging device, and particularly to an imaging device that servo-controls an exposure member such as an aperture in accordance with changes in the brightness of a subject.

（従来技術） 従来、ビデオカメラ等の撮像装置において絞り径を被写
体の明るさ変化に追従して変化させ、常に最適なレベル
の光量が撮像素子に入射するようサーボ制御するものが
知られている。(Prior art) Conventionally, it is known that in imaging devices such as video cameras, the diameter of the aperture is changed in accordance with changes in the brightness of the subject, and servo control is performed so that the optimal level of light is always incident on the imaging device. .

ところで、このようなビデオカメラにおいて、電子ビュ
ーファインダーで被写体の観察を行いながら、照明を用
いて撮影等を行う場合、照明撮影時には絞りは照明撮影
用の固定絞り値に設定することが考えられる。この為照
明撮影直後に電子ビューファインダーで被写体を観察し
ようとすると、絞りは照明撮影用の固定値となっており
、その値は必ずしも電子ビューファインダーで見る明る
さとして適正ではない。By the way, in such a video camera, when photographing using illumination while observing a subject with an electronic viewfinder, it is conceivable to set the aperture to a fixed aperture value for illumination photography during illumination photography. For this reason, if you try to observe a subject with an electronic viewfinder immediately after photographing with illumination, the aperture is a fixed value for photographing with illumination, and that value is not necessarily appropriate for the brightness seen with the electronic viewfinder.

そのため絞りサーボを働かせてから絞りが適正となるま
で、電子ビューファインダー内の画像の明るさは不安定
となり、その後の撮影のタイミングを逸する可能性が非
常に高い。Therefore, the brightness of the image in the electronic viewfinder will be unstable from the time the aperture servo is activated until the aperture is adjusted to the appropriate value, and there is a high possibility that the timing for subsequent shooting will be missed.

（目　　的） 本発明は、上述の欠点を除去した撮像装置を提供する事
を目的とする。又、露出値を固定した撮影直後のビュー
ファインダーやモニターの明るさの不安定さや違和感を
なくした撮像装置を提供することを目的としたものであ
る。(Objective) An object of the present invention is to provide an imaging device that eliminates the above-mentioned drawbacks. Another object of the present invention is to provide an imaging device that eliminates instability and discomfort in the brightness of a viewfinder and monitor immediately after shooting with a fixed exposure value.

（実施例） 第１図は本発明の撮像装置の実施例図で、１はレンズ、
２は露出部材としての絞り、３は光学画像を電気信号に
変換する撮像手段としての撮像デバイス、４は信号処理
回路、５は記録部、６は絞り駆動回路、１９は信号処理
回路４から取り出された輝度信号等の被写体の明るさに
対応した信号、７は信号１９に基づいて最適絞り値を演
算する演算回路、２０は７の演算回路で演算された絞り
目標データ、８は第２図に示す真理値表に基づき動作す
るラッチ回路、２１はラッチ出力、９゜１５はＡＮＤゲ
ート回路、１０．１２はインへ−タ回路、１１は入力の
立ち上りでＴ、時間Ｈレベルを出力するワンショット回
路、１３は入力の立ち上りでＴ２　　（Ｔ２　＜ＴＩ　
）時間Ｈレベルを出力１　　　　　す、ヮ７．ヨッ（＠
　Ｍ、１４　ｒ＊　Ｉｆ？、　’１４撮影時。絞。(Example) FIG. 1 is an example diagram of the imaging device of the present invention, where 1 is a lens;
2 is an aperture as an exposure member, 3 is an imaging device as an imaging means for converting an optical image into an electrical signal, 4 is a signal processing circuit, 5 is a recording section, 6 is an aperture drive circuit, and 19 is taken out from the signal processing circuit 4 7 is an arithmetic circuit that calculates the optimum aperture value based on the signal 19, 20 is aperture target data calculated by the arithmetic circuit 7, and 8 is Fig. 2 21 is a latch output, 9.15 is an AND gate circuit, 10.12 is an input circuit, and 11 is a circuit that outputs T and H level at the rising edge of the input. In the shot circuit, 13 is T2 (T2 < TI
) Time H level is output 1, ヮ7. Yo (@
M, 14 r* If? , '14 shooting time. Aperture.

を一定の値になるよう制御する照明モード絞り制御回路
、２４は照明モード時の絞り制御データ信号、１６は電
源スィッチ、１７はトリガー手段としての撮影レリーズ
スイッチ、１８は照明撮影モート切換スイッチで０Ｎ（
Ｈレベル）で照明撮影モード、ＯＦＦ　（Ｌレベル）で
非照明撮影モードとなる。24 is an aperture control data signal in illumination mode, 16 is a power switch, 17 is a shooting release switch as a trigger means, and 18 is an illumination shooting mode changeover switch that is 0N. (
When set to OFF (L level), it becomes illumination shooting mode, and when it is OFF (L level), it becomes non-illumination shooting mode.

また２５は電子ビューファインダー、ＬＥは照明装置で
あり、Ｂ端子にハイレベルが入力されると給電を開始し
、Ａ端子にハイレベルが入力されると、これに応じて発
光が開始される。又、ＣＴＬは露出制御手段としての制
御ブロックである。・ 次に本実施例の動作を第１〜２図を用いて説明する。ま
ず照明モード時（即ちスイッチ１８：０ＦＦ）、スイッ
チ１７：ＯＦＦで、スイッチ１６をＯＮすると本体の電
源がＯＮになり、撮像デバイス３で受光された画像は電
気信号に変換される。信号処理回路では撮像デバイス３
からの信号に基づいて被写体の輝度に対応した信号１９
を出力する。演算回路７は信号１９より適正絞り値を計
算し、目標絞り値信号２０を出力する。このときラッチ
回路８はＣＬ大入力Ｈレベル、ＥＮ入力がＨレベルであ
るため目標絞り値２ｏをそのまま信号２１として出力し
、絞り駆動回路６により絞り２が駆動される。こうして
絞り２はスイッチ１６がＯＮかつスイッチ１７がＯＦＦ
の間、被写体の明るさに追従してサーボ制御される。Further, 25 is an electronic viewfinder, and LE is a lighting device, which starts supplying power when a high level is input to the B terminal, and starts emitting light when a high level is input to the A terminal. Further, CTL is a control block serving as exposure control means. - Next, the operation of this embodiment will be explained using FIGS. 1 and 2. First, in the illumination mode (ie, switch 18: 0FF), switch 17: OFF, and when switch 16 is turned on, the power of the main body is turned on, and the image received by the imaging device 3 is converted into an electrical signal. Imaging device 3 in the signal processing circuit
A signal 19 corresponding to the brightness of the subject based on the signal from
Output. The arithmetic circuit 7 calculates an appropriate aperture value from the signal 19 and outputs a target aperture value signal 20. At this time, since the CL large input is at H level and the EN input is at H level, the latch circuit 8 directly outputs the target aperture value 2o as a signal 21, and the aperture drive circuit 6 drives the aperture 2. In this way, the aperture 2 has switch 16 ON and switch 17 OFF.
During this period, servo control is performed to follow the brightness of the subject.

この状態で照明装置を使用せずに撮影する際はレリーズ
スイッチエアに連動して記録動作が行われるが、このと
きの絞りは、まずワンショット回路１１が記録に十分な
時間Ｔ１だけＨレベルを出力し、これによりラッチ８の
クロック入力ＣＬのレベルはＬレベルとなる。このとき
ＥＮ入力２３はＨレベルのままであるので、データとし
ては、ラッチ８のＣＬ入力２２がＬになる直前、即ちレ
リーズスイッチをＯＮにする直前のものが時間Ｔ、だけ
出力される。従って絞りはレリーズスイッチをＯＮする
直前の値が記録中保持され、記録後時間Ｔ、が経過する
と、ラッチ８のＣＬ入力２２がＨレベルとなりサーボ絞
り制御が再び開始される。When taking a picture without using a lighting device in this state, the recording operation is performed in conjunction with the release switch air, but the aperture at this time is first set at the H level by the one-shot circuit 11 for a time T1 sufficient for recording. As a result, the level of the clock input CL of the latch 8 becomes L level. At this time, since the EN input 23 remains at the H level, data immediately before the CL input 22 of the latch 8 becomes L, that is, immediately before the release switch is turned on, is output for a time T. Therefore, the value of the aperture immediately before turning on the release switch is held during recording, and when time T has elapsed after recording, the CL input 22 of the latch 8 goes to the H level and servo aperture control is started again.

また、照明撮影時は、まずモード切換スイッチ１８をＯ
Ｎにする。すると照明装置ＬＥへの給電が開始される。Also, when shooting with lighting, first turn the mode selector switch 18 to O.
Set it to N. Then, power supply to the lighting device LE is started.

又スイッチ１６がＯＮ、　スイッチ゛１７がＯＦＦの状
態では前記の状態と同じくサーボ絞り制御が行われるが
、レリーズスイッチ１７をＯＮすると、ワンショット回
路１３より記録に十分かつ時間Ｔ１より短い１２時間だ
けＨレベルが出力され、照明装置が発光すると共にラッ
チ回路８のＥＮ入力２３がＬレベルとなり、ラッチ８か
らのデータ出力を禁止する。このとき同時に、照明モー
ド絞り制御回路１４がＯＮになり、一定の照明絞り制御
データ２４が出力され、絞りが制御される。Also, when the switch 16 is ON and the switch 17 is OFF, servo aperture control is performed in the same way as in the previous state, but when the release switch 17 is turned ON, the one-shot circuit 13 holds the H for 12 hours sufficient for recording and shorter than the time T1. The level is output, the lighting device emits light, and the EN input 23 of the latch circuit 8 becomes L level, prohibiting data output from the latch 8. At the same time, the illumination mode aperture control circuit 14 is turned on, constant illumination aperture control data 24 is output, and the aperture is controlled.

ここで、本実施例では照明撮影に際して露出部材（例え
ば絞り）を固定の値となるよう制御しているが、これは
露出部材をサーボ制御する場合に短時間だけ照明を行う
とサーボがこの被写体条件に追従できない欠点があるの
を解決する為のもので、これにより照明撮影中でも適正
な露出が得られる、尚、照明撮影時の固定の露出値は被
写体までの距離に応じて決まる値であっても良く、本発
明はそのようなものも含む。Here, in this embodiment, the exposure member (for example, the aperture) is controlled to a fixed value when shooting with lighting, but this means that when the exposure member is servo-controlled, if the illumination is performed for a short period of time, the servo will be This is to solve the drawback of not being able to follow the conditions, and this allows you to obtain a proper exposure even when shooting with lighting.The fixed exposure value when shooting with lighting is a value determined according to the distance to the subject. However, the present invention also includes such a method.

そして照明撮影で記録が終了し、１２時間経過するとワ
ンショット回路１３の出力はＬレベルとなり、照明モー
ド絞り制御回路がＯＦＦされ、かわってラッチ回路８の
ＥＮ入力２３がＨレベルとなり、レリーズスイッチエア
をＯＮする直前にラッチされたデータが出力され、絞り
は照明撮影時の絞り値から、レリーズスイッチエアをＯ
Ｎｆる直前の絞り値に駆動される。そしてＴ１時間経過
後再び絞りサーボ制御が行われる。Then, after 12 hours have elapsed after recording with lighting has finished, the output of the one-shot circuit 13 becomes L level, the illumination mode aperture control circuit is turned off, and the EN input 23 of the latch circuit 8 becomes H level, and the release switch air The data latched just before turning on is output, and the aperture is changed from the aperture value at the time of lighting photography to the release switch when the air is turned on.
It is driven to the aperture value immediately before Nf. After time T1 has elapsed, the aperture servo control is performed again.

以上説明したように、本発明の実施例によれば、被写体
の明るさの変化に追従して絞りをサーボ制御する際、撮
影直後の絞りの初期値を撮影直前の絞りとする構成とし
ている。被写体の明るさは撮影の直前と直後でほとんど
差が生じない。As described above, according to the embodiment of the present invention, when performing servo control of the aperture in accordance with changes in the brightness of the subject, the initial value of the aperture immediately after photographing is set to the aperture immediately before photographing. There is almost no difference in the brightness of the subject immediately before and after shooting.

従って撮影時ビューファインダー等で被写体を観察して
いても、撮影直後のファインダーに映る被写体像の明る
さの変化の不自然さを減少させることができる。Therefore, even if the subject is observed through a viewfinder or the like during photography, unnatural changes in the brightness of the subject image reflected in the finder immediately after photography can be reduced.

又、絞りの安定比に要する時間が短くなるので、次の撮
影を速やかに行うことができる。特に、照明撮影のよう
に、撮影時に絞り値がそれまでと大幅に変化する事の多
い場合等に極めて有効である。Furthermore, since the time required for the aperture to stabilize is shortened, the next photograph can be taken quickly. This is particularly effective in cases where the aperture value often changes significantly during photography, such as when photographing with illumination.

尚、前記実施例の構成では、絞り値の演算を撮像デバイ
スからの信号を基に行ったが、例えばＳＰＣ等を使って
測光手段を別に設け、その測光結果に基づいて絞り値の
演算を行ってもよい、また制御ブロックとしてマイクロ
コンピュータを用いてソフトウェアで同様の機能を実現
することも勿論可能である。In the configuration of the above embodiment, the aperture value is calculated based on the signal from the imaging device, but it is also possible to separately provide a photometry means using, for example, SPC, and calculate the aperture value based on the photometry result. Of course, it is also possible to realize similar functions by software using a microcomputer as a control block.

又、照明装置としては螢光灯、タングステンランプ、ハ
ロゲンランプ、キャノン管等を用いたものすべてを含む
。又、露出部材として絞りの例を挙げたが、例えばロー
タリシャッターや物性シャッターのようなシャッターを
代わりに用いた　　　　　１ものも本発明は含む。In addition, lighting devices include all those using fluorescent lamps, tungsten lamps, halogen lamps, cannon tubes, etc. Further, although an example of a diaphragm is given as an exposure member, the present invention also includes a system in which a shutter such as a rotary shutter or a physical shutter is used instead.

（効　　果） 以上説明したように本発明によれば、１出のサーボ制御
を行う場合に短時間照明撮影等の為に露出値を固定して
もファインダーやモニター上での違和感がなく、しかも
次の撮影を速やかに行う事ができる。(Effects) As explained above, according to the present invention, when performing single-output servo control, even if the exposure value is fixed for short-term lighting photography, etc., there is no discomfort on the viewfinder or monitor, and moreover, You can quickly take the next photo.

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

第１図は本発明の撮像装置の構成例を示す図、第２図は
ラッチ回路８の動作状態図。 ３−一一一撮像手段としての撮像デバイス、２−一一一
露出廓材としての絞り、 １７−−−−）リガ一手段としての撮影レリーズスイッ
チ、 ＣＴ　Ｌ−−−一露出制御手段としての制御ブロック。FIG. 1 is a diagram showing an example of the configuration of an imaging device according to the present invention, and FIG. 2 is a diagram showing the operating state of a latch circuit 8. 3-111 Imaging device as an imaging means, 2-111 Aperture as an exposure material, 17----) Shooting release switch as a trigger means, CT L----1 As an exposure control means control block.

Claims (1)

【特許請求の範囲】 光学像を電気信号に変換する撮像手段、 該撮像手段の露出状態を変化させる露出部材、トリガー
手段、 該トリガー手段のトリガー出力に先立って前記露出部材
により前記露出状態をサーボ制御すると共に、該トリガ
ー手段のトリガー出力に応じて前記露出状態を所定時間
だけ一定に保持し、その後前記トリガー出力の直前の露
出値を初期値として前記サーボ制御を開始させる露出制
御手段、を有する撮像装置。[Scope of Claims] Imaging means for converting an optical image into an electrical signal, an exposure member for changing the exposure state of the imaging means, a trigger means, and a servo control of the exposure state by the exposure member prior to trigger output of the trigger means. exposure control means that controls the exposure state and holds the exposure state constant for a predetermined time according to a trigger output of the trigger means, and then starts the servo control using an exposure value immediately before the trigger output as an initial value. Imaging device.