JPH11220652A - Image pickup device - Google Patents
Image pickup deviceInfo
- Publication number
- JPH11220652A JPH11220652A JP10020938A JP2093898A JPH11220652A JP H11220652 A JPH11220652 A JP H11220652A JP 10020938 A JP10020938 A JP 10020938A JP 2093898 A JP2093898 A JP 2093898A JP H11220652 A JPH11220652 A JP H11220652A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- aperture
- diaphragm
- predetermined value
- illuminance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Exposure Control For Cameras (AREA)
- Diaphragms For Cameras (AREA)
- Studio Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、絞り手段と減光フ
ィルタとを有する撮像装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an imaging apparatus having a diaphragm and a neutral density filter.
【０００２】[0002]
【従来の技術】従来、ビデオカメラ等の撮像装置によ
り、被写体照度が高い海岸や雪山などで撮影する場合に
は、カメラの絞りが小絞りになっても適正な露出が得ら
れるように絞り羽根に減光フィルタ（以下、ＮＤフィル
タという）を貼り付けて用いる手法が用いられてきた。2. Description of the Related Art Conventionally, when an image pickup apparatus such as a video camera is used for photographing on a shore or a snowy mountain where the illuminance of a subject is high, aperture blades are provided so that an appropriate exposure can be obtained even when the aperture of the camera is small. A method has been used in which a neutral density filter (hereinafter, referred to as an ND filter) is attached to the ND.
【０００３】ここで、図９に、従来のビデオカメラに用
いられてきた絞り羽根の構造と動作を示す。この図にお
いて、９０１，９０２は絞り羽根、９０３は絞り羽根９
０１に取り付けられたＮＤフィルタである。また、９０
４は撮像光学系の絞り羽根付近の光路径を示す。この図
から分かるように、被写体照度が大きくなるにしたがっ
て、絞り径が開放の状態（ａ）から小絞り状態（ｄ）に
変化する。FIG. 9 shows the structure and operation of an aperture blade used in a conventional video camera. In this figure, 901 and 902 are aperture blades, and 903 is an aperture blade 9
01 is an ND filter attached to the ND filter. Also, 90
Reference numeral 4 denotes an optical path diameter near the aperture blade of the imaging optical system. As can be seen from this figure, as the subject illuminance increases, the aperture diameter changes from the open state (a) to the small aperture state (d).
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来の撮像装置においては、絞り径が図９（ｄ）に示すよ
うな小絞りになったときには絞り羽根９０１に貼り付け
たＮＤフィルタ９０３の効果が得られるが、絞り径がＮ
Ｄフィルタ９０３の径よりも大きくなると、図９（ｃ）
に示すようにＮＤフィルタ９０３と絞り羽根９０２との
間の隙間ａを通過する光と、ＮＤフィルタ９０３を通過
する光との光束の差によりシェーディングや回折が発生
し、画質が劣化するという問題がある。However, in the above-mentioned conventional image pickup apparatus, when the aperture diameter becomes small as shown in FIG. 9D, the effect of the ND filter 903 attached to the aperture blade 901 is reduced. Can be obtained, but the aperture diameter is N
When the diameter becomes larger than the diameter of the D filter 903, FIG.
As shown in FIG. 7, there is a problem that shading or diffraction occurs due to a difference in light flux between light passing through the gap a between the ND filter 903 and the aperture blade 902 and light passing through the ND filter 903, thereby deteriorating image quality. is there.
【０００５】図８には、従来の撮像装置における被写体
照度と絞り径との関係を示す。この図から分かるよう
に、被写体照度が明るくなるにしたがって絞り径が小さ
くなり、所定の明るさＰ１になった時点で絞り径が回折
を起こす限界まで小さくなってしまう。しかし、その前
の明るさＰ０の時点で絞り径が図９（ｃ）に示す大きさ
になるため、前述したシェーディングや回折等の問題が
発生してしまう。FIG. 8 shows the relationship between the illuminance of a subject and the diameter of an aperture in a conventional imaging apparatus. As can be seen from this figure, the aperture diameter becomes smaller as the illuminance of the subject becomes brighter, and when the brightness reaches the predetermined brightness P1, the aperture diameter becomes as small as possible to cause diffraction. However, since the aperture diameter becomes the size shown in FIG. 9C at the time of the brightness P0 before that, the above-described problems such as shading and diffraction occur.
【０００６】また、ＮＤフィルタ９０３が絞り羽根９０
１に固定されているため、図９（ａ），（ｂ）に示すよ
うに、絞りが充分に開いている場合でもＮＤフィルタ９
０３が光路内に存在し、撮像した映像のボケ味が悪くな
る等の問題もある。Further, the ND filter 903 is used to
1, the ND filter 9 is provided even when the aperture is sufficiently open, as shown in FIGS. 9 (a) and 9 (b).
03 is present in the optical path, and there is also a problem that the blurring of the captured video becomes worse.
【０００７】さらに、従来の撮像装置においては、図８
の線図からも分かるように、ＮＤフィルタ９０３により
絞り開口を覆ったとしても、高画質で撮像可能な被写体
照度の明るい側への範囲の拡大効果が十分に得られない
という欠点もある。Further, in the conventional imaging apparatus, FIG.
As can be seen from the diagram, even if the aperture opening is covered by the ND filter 903, there is a disadvantage that the effect of expanding the range of the subject illuminance that can be imaged with high image quality to the bright side cannot be sufficiently obtained.
【０００８】[0008]
【課題を解決するための手段】上記のような課題を解決
するため、本願第１の発明では、撮像手段への入射光量
を決定する絞り開口の大きさを変更する絞り手段と、絞
り開口全体を覆う挿入位置と絞り開口全体から待避する
待避位置との間で移動する減光フィルタと、撮像手段を
通じて検出された被写体照度に応じて絞り手段を制御す
るとともに減光フィルタの移動を制御する制御手段とを
有する撮像装置において、制御手段に、減光フィルタが
待避位置に位置した状態で絞り開口の大きさが第１所定
値になったときは、減光フィルタを挿入位置に移動させ
ると同時に絞り手段に絞り開口を第１所定値より大きく
させる制御を行わせるようにしている。In order to solve the above-mentioned problems, in the first invention of the present application, a diaphragm means for changing the size of the diaphragm opening for determining the amount of light incident on the imaging means, A dimming filter that moves between an insertion position that covers the aperture and a retracted position that retreats from the entire diaphragm opening, and control that controls the diaphragm unit and controls the movement of the dimming filter according to the illuminance of the subject detected through the imaging unit. The size of the aperture opening reaches a first predetermined value in a state where the dimming filter is located at the retreat position, and simultaneously moves the dimming filter to the insertion position. The diaphragm means is controlled to make the diaphragm aperture larger than a first predetermined value.
【０００９】なお、制御手段には、減光フィルタが挿入
位置に位置した状態で絞り開口の大きさが第１所定値よ
りも大きい第２所定値になったときは、減光フィルタを
前記待避位置に移動させると同時に絞り手段に絞り開口
を第２所定値より小さくさせる制御を行わせるようにす
るのが望ましい。When the size of the aperture opening reaches a second predetermined value larger than the first predetermined value in a state where the neutral density filter is located at the insertion position, the control means moves the neutral density filter to the retracted position. It is desirable to control the diaphragm means to make the diaphragm aperture smaller than the second predetermined value at the same time as moving to the position.
【００１０】これらにより、従来の問題であった減光フ
ィルタと絞り羽根との隙間の部分を通過する光と減光フ
ィルタの部分を通過する光の光束の差によってシェーデ
ィングや回折が発生することを防止することが可能にな
る。しかも、減光フィルタが待避位置にある状態で絞り
開口が回折限界に近い第１所定値になると減光フィルタ
を挿入位置に移動させるとともに絞り開口を大きくする
ため、その後に絞り開口を小さくすることができる量を
大きくでき、高画質撮像可能な被写体照度の明るい側の
範囲を従来に比べて大きく広げることができる。As a result, shading and diffraction caused by the difference in the light flux between the light passing through the gap between the neutral density filter and the aperture blade and the light passing through the neutral density filter, which is a conventional problem, can be prevented. Can be prevented. In addition, when the aperture opening reaches the first predetermined value close to the diffraction limit in a state where the neutral density filter is in the retracted position, the neutral density filter is moved to the insertion position and the aperture opening is enlarged. Thus, the range on the bright side of the illuminance of the subject for which high-quality imaging can be performed can be greatly expanded as compared with the related art.
【００１１】また、本願第２の発明では、撮像手段への
入射光量を決定する絞り開口の大きさを変更する絞り手
段と、絞り開口全体を覆う挿入位置と絞り開口全体から
待避する待避位置との間で移動する減光フィルタと、撮
像手段を通じて検出された被写体照度に応じて絞り手段
を制御するとともに撮像手段の撮像時間および減光フィ
ルタの移動を制御する制御手段とを有する撮像装置にお
いて、制御手段に、減光フィルタが待避位置に位置し、
かつ露出時間が所定高速秒時である状態で絞り開口の大
きさが第１所定値になったときは、減光フィルタを挿入
位置に移動させると同時に露出時間を所定高速秒時より
低速にする制御を行わせるようにしている。In the second aspect of the present invention, the aperture means for changing the size of the aperture opening for determining the amount of light incident on the image pickup means, the insertion position covering the entire aperture opening, and the retreat position for retreating from the entire aperture opening. And a control unit that controls the diaphragm unit in accordance with the illuminance of the subject detected through the imaging unit and a control unit that controls the imaging time of the imaging unit and the movement of the neutral density filter. In the control means, the neutral density filter is located at the retracted position,
When the size of the aperture opening reaches the first predetermined value in a state where the exposure time is the predetermined high-speed second, the neutral density filter is moved to the insertion position and the exposure time is made lower than the predetermined high-speed second. Control is performed.
【００１２】しかも、制御手段に、減光フィルタが待避
位置に位置し、かつ露出時間が所定高速秒時より低速で
ある状態で絞り開口の大きさが第１所定値となったとき
は、被写体照度が高くなるに従って、絞り開口の大きさ
を第１所定値に維持したまま露出時間を所定高速秒時に
向かって高速にする制御を行われるようにしている。さ
らに、制御手段には、減光フィルタが挿入位置に位置
し、かつ露出時間が所定低速秒時である状態で絞り開口
の大きさが第１所定値よりも大きい第２所定値になった
ときは、減光フィルタを待避位置に移動させると同時に
露出時間を所定低速秒時より高速にする制御を行わせる
ようにしている。When the size of the aperture opening reaches the first predetermined value in a state where the dimming filter is located at the retreat position and the exposure time is lower than the predetermined high-speed second, the control means indicates that As the illuminance increases, control is performed to increase the exposure time toward a predetermined high-speed second while maintaining the size of the aperture opening at the first predetermined value. Further, the control means includes a step of setting the size of the aperture opening to a second predetermined value larger than the first predetermined value in a state where the neutral density filter is located at the insertion position and the exposure time is a predetermined low speed second. In this method, the control is performed to move the neutral density filter to the retreat position and at the same time to make the exposure time faster than a predetermined low speed.
【００１３】また、制御手段に、減光フィルタが待避位
置に位置し、かつ露出時間が所定低速秒時より高速であ
る状態で絞り開口の大きさが第２所定値になったとき
は、被写体照度が低くなるに従って、絞り開口の大きさ
を第２所定値に維持したまま露出時間を所定低速秒時に
向かって低速にする制御を行わせるようにしている。When the size of the aperture opening reaches a second predetermined value in a state where the dimming filter is located at the retreat position and the exposure time is higher than the predetermined low speed second, the control means indicates that As the illuminance decreases, control is performed to decrease the exposure time toward a predetermined low-speed second while maintaining the size of the aperture opening at the second predetermined value.
【００１４】これらにより、従来の問題であった減光フ
ィルタと絞り羽根との隙間の部分を通過する光と減光フ
ィルタの部分を通過する光の光束の差によってシェーデ
ィングや回折が発生することを防止することが可能にな
る。しかも、減光フィルタが待避位置にある状態で絞り
開口が回折限界に近い第１所定値になったときには、露
出時間を所定高速秒時まで高速にする制御を行った上で
減光フィルタを挿入位置に移動させるとともに露出時間
を低速にするようにしているので、上記露出時間の制御
を行う分、高画質撮像可能な被写体照度の明るい側の範
囲を従来に比べて広げることができる。Accordingly, shading and diffraction are caused by the difference between the light flux of the light passing through the gap between the neutral density filter and the aperture blade and the light passing through the neutral density filter. Can be prevented. In addition, when the aperture opening reaches the first predetermined value close to the diffraction limit while the neutral density filter is in the retracted position, control is performed to increase the exposure time to a predetermined high speed second, and then the neutral density filter is inserted. Since the exposure time is reduced at the same time as moving to the position, the range of the bright side of the illuminance of the subject that can perform high-quality imaging can be widened compared to the related art, by controlling the exposure time.
【００１５】なお、上記各発明において、減光フィルタ
を待避位置から挿入位置に移動させるときの被写体照度
を、減光フィルタを挿入位置から待避位置に移動させる
ときの被写体照度よりも高くして、ヒステリシスを持た
せることにより、減光フィルタの移動制御や撮像時間の
変化が頻繁に起こることを防止するのが望ましい。In each of the above inventions, the illuminance of the subject when the dimming filter is moved from the retracted position to the insertion position is made higher than the illuminance of the subject when the dimming filter is moved from the insertion position to the retracted position. It is desirable to provide a hysteresis to prevent frequent changes in the movement control of the neutral density filter and changes in the imaging time.
【００１６】[0016]
【発明の実施の形態】（第１実施形態）図１には、本発
明の第１実施形態である撮像装置を示している。この図
において、１００は撮像光学系の光軸、１０１，１０２
は撮像光学系レンズである。光軸１０１上には、ＮＤフ
ィルタ駆動部１０３により挿入・待避されるＮＤフィル
タ（減光フィルタ）１０４と、絞り駆動部１０５により
制御される絞り装置１０６とが配置されている。なお、
ＮＤフィルタ１０４と絞り装置１０６とは互いに独立し
て制御される。(First Embodiment) FIG. 1 shows an imaging apparatus according to a first embodiment of the present invention. In this figure, reference numeral 100 denotes an optical axis of an imaging optical system;
Denotes an imaging optical system lens. On the optical axis 101, an ND filter (light-reducing filter) 104 inserted and retracted by the ND filter driving unit 103 and a diaphragm device 106 controlled by a diaphragm driving unit 105 are arranged. In addition,
The ND filter 104 and the aperture device 106 are controlled independently of each other.
【００１７】これら撮像光学系を通過した被写体像は撮
像素子１０７上に結合される。そして、撮像素子１０７
からの信号は映像信号処理回路１０８において標準テレ
ビジョン信号に変換され、図示しない外部の記録部やテ
レビジョンモニタ等に出力される。なお、撮像素子１０
７には映像信号処理回路１０８からの制御信号により撮
像素子１０７のシャッタースピード（撮像時間）を可変
できる撮像素子駆動回路１０９が接続されている。The subject images passing through these image pickup optical systems are combined on an image pickup device 107. Then, the image sensor 107
Is converted into a standard television signal in the video signal processing circuit 108 and output to an external recording unit (not shown), a television monitor, or the like. Note that the imaging device 10
7 is connected to an image sensor driving circuit 109 that can change the shutter speed (image capturing time) of the image sensor 107 by a control signal from the video signal processing circuit 108.
【００１８】１１０は光量制御部であり、映像信号処理
回路１０８から被写体の輝度信号が入力される。また、
絞り径検出部１１１からは現在の絞り径（絞り値）を示
す信号が入力される。光量制御部１１０はこれらの信号
に応じて適切な絞り制御信号、ＮＤフィルタ制御信号を
図３に示すプログラム線図から読み出して、各制御部に
出力する。また、光量制御部１１０は、輝度信号や絞り
値信号に応じてシャッタースピードを不図示のプログラ
ム線図から読み出して、映像信号処理回路１０８にシャ
ッタースピード制御信号を出力する。映像信号処理回路
１０８は入力されたシャッタースピード制御信号に従
い、撮像素子駆動回路１０９を駆動して撮像素子１０７
のシャッタースピードを決定する。Reference numeral 110 denotes a light amount control unit, to which a luminance signal of a subject is input from the video signal processing circuit 108. Also,
From the aperture diameter detection unit 111, a signal indicating the current aperture diameter (aperture value) is input. The light quantity control unit 110 reads an appropriate aperture control signal and ND filter control signal from the program diagram shown in FIG. 3 according to these signals, and outputs them to each control unit. The light amount control unit 110 reads a shutter speed from a program diagram (not shown) according to a luminance signal and an aperture value signal, and outputs a shutter speed control signal to the video signal processing circuit 108. The video signal processing circuit 108 drives the image sensor driving circuit 109 according to the input shutter speed control signal to
Determine the shutter speed.
【００１９】次に、図２に示すフローチャートを用い
て、本実施形態における光量制御部１１０の動作を説明
する。まずステップＳ２０１では、光量制御部１１０内
のマイクロコントローラおよび周辺回路の初期化を行
う。次にステップＳ２０２で、映像信号処理回路１０８
から１フィールドごとに入力される輝度信号が所定の明
るさになるように絞り装置１０６のフィードバック制御
を行う。Next, the operation of the light quantity control unit 110 in this embodiment will be described with reference to the flowchart shown in FIG. First, in step S201, the microcontroller in the light quantity control unit 110 and peripheral circuits are initialized. Next, in step S202, the video signal processing circuit 108
The feedback control of the aperture device 106 is performed such that the luminance signal input for each field from the predetermined brightness is obtained.
【００２０】次に、ステップＳ２０３では、絞り径検出
部１１１からの現在の絞り径情報Ｒとフィルタ待避径Ｒ
２（第２所定値）とを比較する。被写体照度が低く現在
の絞り径Ｒがフィルタ待避径Ｒ２以上であると判断した
場合には、ステップＳ２０４に進んで、ＮＤフィルタ１
０４が挿入されているかどうかを確認する。Next, at step S203, the current aperture diameter information R from the aperture diameter detection unit 111 and the filter retreat diameter R
2 (second predetermined value). If it is determined that the subject illuminance is low and the current aperture diameter R is equal to or larger than the filter retracting diameter R2, the process proceeds to step S204, and the ND filter 1
Check whether 04 is inserted.
【００２１】ＮＤフィルタ１０４が挿入されている場合
は、ステップＳ２０５に進んで、ＮＤフィルタ１０４の
待避（取り出し）移動を行う制御信号をＮＤフィルタ駆
動部１０３に出力すると同時にステップＳ２０６にてＮ
Ｄフィルタ１０４の待避により増加した光量分に相当す
る量ＤＲ２だけ絞り装置１０６を閉じる処理を絞り駆動
部１０５に対して行う。If the ND filter 104 has been inserted, the process proceeds to step S205, where a control signal for performing the shunting (removing) movement of the ND filter 104 is output to the ND filter driving unit 103, and at the same time, N is determined in step S206.
A process of closing the aperture device 106 by the amount DR2 corresponding to the amount of light increased by the retraction of the D filter 104 is performed on the aperture driving unit 105.
【００２２】一方、ステップＳ２０４にてＮＤフィルタ
１０４が待避していると確認した場合は、ステップＳ２
０２に戻り、次回の露出制御動作を行う。On the other hand, if it is confirmed in step S204 that the ND filter 104 is retracted, the process proceeds to step S2.
02, and the next exposure control operation is performed.
【００２３】また、ステップＳ２０３にて、現在の絞り
径Ｒがフィルタ待避径Ｒ２より小さいと判断した場合に
は、ステップＳ２０７に進み、現在の絞り径Ｒとフィル
タ挿入径Ｒ１（第１所定値）との比較を行う。被写体照
度が高く現在の絞り径Ｒがフィルタ挿入径Ｒ１以下と判
断した場合は、ステップＳ２０８に進み、ＮＤフィルタ
１０４が挿入されているかどうかを確認する。ＮＤフィ
ルタ１０４が待避していることが確認されたときは、ス
テップＳ２０９に進み、ＮＤフィルタ１０４を挿入する
制御信号をＮＤフィルタ駆動部１０３に出力すると同時
に、ステップＳ２１０にてＮＤフィルタ１０４の挿入に
より減少した光量分に相当する量ＤＲ１分だけ絞り装置
１０６を開く処理を絞り駆動部１０５に対して行う。If it is determined in step S203 that the current aperture diameter R is smaller than the filter retracting diameter R2, the process proceeds to step S207, where the current aperture diameter R and the filter insertion diameter R1 (first predetermined value) are set. Compare with. If it is determined that the illuminance of the subject is high and the current aperture diameter R is equal to or smaller than the filter insertion diameter R1, the process proceeds to step S208, and it is determined whether the ND filter 104 is inserted. If it is confirmed that the ND filter 104 is retracted, the process proceeds to step S209, where a control signal for inserting the ND filter 104 is output to the ND filter driving unit 103, and at the same time, the ND filter 104 is inserted in step S210. A process of opening the aperture device 106 by an amount DR1 corresponding to the reduced light amount is performed on the aperture driving unit 105.
【００２４】一方、ステップＳ２０８にてＮＤフィルタ
１０４が挿入されていると確認した場合は、ステップＳ
２０２に戻り、次回の露出制御動作を行う。On the other hand, if it is confirmed in step S208 that the ND filter 104 has been inserted, the process proceeds to step S208.
Returning to step 202, the next exposure control operation is performed.
【００２５】次に上記の動作を図３および図４を用いて
説明する。なお、図４において、２０１，２０２は絞り
装置１０６内の絞り羽根である。初期状態において被写
体照度が低く絞り装置１０６の絞り径が全開Ｒｍａｘで
あるとき、絞り開口の形状は図４（ａ）に示すように開
放状態になる。Next, the above operation will be described with reference to FIGS. In FIG. 4, reference numerals 201 and 202 denote diaphragm blades in the diaphragm device 106. In the initial state, when the illuminance of the subject is low and the aperture diameter of the aperture device 106 is fully open Rmax, the shape of the aperture opening is open as shown in FIG.
【００２６】そして、被写体照度が高くなって図３のＰ
２に近づいていくと、絞り装置１０６は徐々に閉じてい
き、絞り径はフィルタ挿入径Ｒ１に近くなり、絞り開口
の形状は図４（ｂ）〜（ｃ）に示すように変化する。な
お、このときは、絞り開口部分にはＮＤフィルタ１０４
は全く入りこんでいない。Then, the illuminance of the subject is increased and P in FIG.
As the distance approaches 2, the aperture device 106 gradually closes, the aperture diameter approaches the filter insertion diameter R1, and the shape of the aperture opening changes as shown in FIGS. In this case, the ND filter 104 is provided at the aperture opening.
Has not penetrated at all.
【００２７】さらに、被写体照度が図３のＰ２まで高く
なり、絞り径がフィルタ挿入径Ｒ１に達すると、図２の
ステップＳ２０７〜Ｓ２１０の処理により絞り開口を完
全に覆うようにＮＤフィルタ１０４が挿入されると同時
に絞り径もＤＲ１分開いてＲ２′となり、図４（ｄ）に
示す状態になる。Further, when the illuminance of the object increases to P2 in FIG. 3 and the aperture diameter reaches the filter insertion diameter R1, the ND filter 104 is inserted so as to completely cover the aperture opening by the processing of steps S207 to S210 in FIG. At the same time, the aperture diameter is opened by DR1 to become R2 ', and the state shown in FIG.
【００２８】さらに、被写体照度が高くなると、絞り装
置１０６は再び閉じていき、図４（ｅ）に示す状態にな
る。When the illuminance of the object further increases, the aperture device 106 closes again, and the state shown in FIG.
【００２９】一方、図４（ｅ）に示す状態から被写体照
度が徐々に低くなると、ＮＤフィルタ１０４が挿入され
たまま照度がＰ３（＜Ｐ２）付近まで絞りが開く制御が
行われ、図４（ｄ′）の状態になる。On the other hand, when the illuminance of the subject gradually decreases from the state shown in FIG. 4E, control is performed to open the aperture to near P3 (<P2) while the ND filter 104 is inserted, and control is performed as shown in FIG. d ').
【００３０】そして、被写体照度がＰ３になり、絞り径
がＲ２′より若干大きいＲ２に達すると、ＮＤフィルタ
１０４が絞り開口を覆う位置から完全に待避すると同時
に絞り径がＤＲ２分閉じてＲ１より若干大きいＲ１′と
なり、図４（ｃ’）の状態になる。When the illuminance of the object becomes P3 and the aperture diameter reaches R2, which is slightly larger than R2 ', the ND filter 104 is completely retracted from the position covering the aperture opening, and at the same time, the aperture diameter is closed by DR2 and slightly smaller than R1. R1 'is large, and the state is as shown in FIG. 4 (c').
【００３１】以上説明した本実施形態の撮像装置によれ
ば、ＮＤフィルタ１０４を絞り開口に対して完全に覆う
位置（挿入位置）と完全に待避する位置（待避位置）と
でのみ移動制御することにより、ＮＤフィルタ１０４が
不完全に絞り開口を覆う状態をなくし、回折やシェーデ
ィングを防止して撮像画質を向上させることができる。According to the imaging apparatus of the present embodiment described above, the movement is controlled only at the position where the ND filter 104 is completely covered with respect to the aperture opening (insertion position) and the position where it is completely retracted (retraction position). Accordingly, the state in which the ND filter 104 incompletely covers the aperture opening can be eliminated, and diffraction and shading can be prevented to improve image quality.
【００３２】また、ＮＤフィルタ１０４が待避位置にあ
る状態で絞り開口がフィルタ挿入径Ｒ１まで小さくなる
と、ＮＤフィルタ１０４を挿入位置に移動させるととも
に絞り開口を大きくするので、広い被写体照度の範囲で
回折等を生じさせずに撮像を行うことができる。なお、
ＮＤフィルタ１０４として光透過率が低いものを用いる
ことにより、回折限界絞り径になる被写体照度をより高
くして、より広い照度範囲で撮像を行えるようにするこ
とも可能である。When the aperture opening is reduced to the filter insertion diameter R1 while the ND filter 104 is in the retracted position, the ND filter 104 is moved to the insertion position and the aperture opening is enlarged. The imaging can be performed without causing the above. In addition,
By using a filter having a low light transmittance as the ND filter 104, it is also possible to increase the illuminance of the subject, which becomes the diameter of the diffraction limit aperture, so that imaging can be performed in a wider illuminance range.
【００３３】さらに、ＮＤフィルタ１０４を待避位置か
ら挿入位置に移動させるときの被写体照度Ｐ２を、挿入
位置から待避位置に移動させるときの被写体照度Ｐ３よ
りも高くしてヒステリシスを持たせているので、これら
照度の付近でＮＤフィルタ１０４の移動が頻繁に起こる
ことを防止できる。Further, since the subject illuminance P2 when the ND filter 104 is moved from the retracted position to the insertion position is higher than the subject illuminance P3 when the ND filter 104 is moved from the inserted position to the retracted position, hysteresis is provided. Frequent movement of the ND filter 104 near these illuminances can be prevented.
【００３４】（第２実施形態）図５には、本発明の第２
実施形態である撮像装置（光量制御部）の動作フローチ
ャートを示している。なお、本実施形態の撮像装置の基
本構成は、第１実施形態の撮像装置とほぼ同じであるの
で、共通構成要素には第１実施形態と同符号を付す。(Second Embodiment) FIG. 5 shows a second embodiment of the present invention.
4 illustrates an operation flowchart of an imaging device (light amount control unit) according to the embodiment. Note that the basic configuration of the imaging apparatus according to the present embodiment is substantially the same as that of the imaging apparatus according to the first embodiment, and thus common components are denoted by the same reference numerals as in the first embodiment.
【００３５】本実施形態は、ＮＤフィルタ１０４の挿入
・待避と同時に撮像素子１０７のシャッタースピード
（撮像時間）の増減を行うようにした点で第１実施形態
と異なる。また、本実施形態の場合、光量制御部１１０
は、被写体の輝度信号や絞り値信号に応じてシャッター
スピードを図６のプログラム線図から読み出して、映像
信号処理回路１０８にシャッタースピード制御信号を出
力する。The present embodiment differs from the first embodiment in that the shutter speed (imaging time) of the image sensor 107 is increased and decreased simultaneously with the insertion and retraction of the ND filter 104. In the case of the present embodiment, the light amount control unit 110
Reads the shutter speed from the program diagram of FIG. 6 according to the luminance signal and aperture value signal of the subject, and outputs a shutter speed control signal to the video signal processing circuit 108.
【００３６】図５において、まずステップＳ５０１で
は、光量制御部１１０内のマイクロコントローラおよぴ
周辺回路の初期化を行う。次にステップＳ５０２で、映
像信号処理回路１０８から１フィールドごとに入力され
る輝度信号が所定の明るさになるように絞り装置１０６
のフィードバック制御を行う。Referring to FIG. 5, first, in step S501, the microcontroller and peripheral circuits in the light quantity control unit 110 are initialized. Next, in step S502, the aperture device 106 is set so that the luminance signal input for each field from the video signal processing circuit 108 has a predetermined brightness.
Feedback control is performed.
【００３７】次に、ステップＳ５０３では、絞り径検出
部１１１からの現在の絞り径情報Ｒとフィルタ待避径Ｒ
３（第２所定値）とを比較する。被写体照度が低く現在
の絞り径Ｒがフィルタ待避径Ｒ３以上であると判断した
場合には、ステップＳ５０４に進んで、ＮＤフィルタ１
０４が挿入されているかどうかを確認する。なお、図６
のプログラム線図から分かるように、絞り径Ｒがフィル
タ待避径Ｒ３以上であるときはシャッタースピードが１
／６０秒（所定低速秒時）に設定される。Next, in step S503, the current aperture diameter information R from the aperture diameter detection unit 111 and the filter retreat diameter R
3 (second predetermined value). If it is determined that the subject illuminance is low and the current aperture diameter R is equal to or larger than the filter retracting diameter R3, the process proceeds to step S504, and the ND filter 1
Check whether 04 is inserted. FIG.
As can be seen from the program diagram, when the aperture diameter R is equal to or larger than the filter retracting diameter R3, the shutter speed becomes 1
/ 60 seconds (at a predetermined low-speed second).
【００３８】ＮＤフィルタ１０４が挿入されている場合
は、ステップＳ５０５に進んで、ＮＤフィルタ１０４の
待避（取り出し）移動を行う制御信号をＮＤフィルタ駆
動部１０３に出力すると同時にステップＳ５０６にてＮ
Ｄフィルタ１０４の待避により増加した光量分、撮像素
子１０７のシャッタースピードを上げて１／５００秒に
設定する（撮像時間を高速秒時にする）処理を映像信号
処理回路１０８に対して行う。映像信号処理回路１０８
は、入力されたシャッタースピードになるように撮像素
子駆動回路１０９を駆動する。If the ND filter 104 has been inserted, the flow advances to step S505 to output to the ND filter driving unit 103 a control signal for retracting (extracting) the ND filter 104, and at the same time, to step S506
The shutter speed of the image sensor 107 is increased by the amount of light increased by the retraction of the D filter 104 and set to 1/500 second (the image capturing time is set to a high speed second). Video signal processing circuit 108
Drives the image sensor driving circuit 109 so that the shutter speed becomes the input shutter speed.
【００３９】なお、ここではシャッタースピードを１／
５００秒に上げる場合について説明したが、適正な露出
になるのであれば特に１／５００秒でなくてもよい。Here, the shutter speed is set to 1 /
Although the case where the exposure time is increased to 500 seconds has been described, the exposure time does not need to be particularly 1/500 second as long as the exposure is appropriate.
【００４０】また、ステップＳ５０４にてＮＤフィルタ
１０４が待避している場合、すなわち図６に示すＰ８よ
りも照度が低い場合は、ステップＳ５０７に進んで、現
在の撮像素子１０７のシャッタースピードが１／６０秒
より高速かどうかを判断する。If the ND filter 104 is retracted at step S504, that is, if the illuminance is lower than P8 shown in FIG. 6, the process proceeds to step S507, where the current shutter speed of the image sensor 107 becomes 1 / Determine if it is faster than 60 seconds.
【００４１】１／６０秒より高速である場合には、ステ
ップＳ５０８に進んで、被写体照度の低下に応じてシャ
ッタースピードを徐々に低速にしていく制御を行う。こ
の場合、被写体照度が図６に示すＰ７からＰ８の照度ま
で徐々に低下していく間、ステップＳ５０２の露出制御
動作では、絞り径をＲ３に維持したままで露出制御を行
うことになる。If the speed is faster than 1/60 seconds, the flow advances to step S508 to control the shutter speed to be gradually reduced according to the decrease in the illuminance of the subject. In this case, while the subject illuminance gradually decreases from P7 to P8 shown in FIG. 6, in the exposure control operation of step S502, exposure control is performed while the aperture diameter is maintained at R3.
【００４２】一方、１／６０秒である場合にはステップ
Ｓ５０２に戻り、絞り径を変化させて露出制御動作を行
う。On the other hand, if it is 1/60 second, the flow returns to step S502, and the exposure control operation is performed by changing the aperture diameter.
【００４３】被写体照度が明るくなり、ステップＳ５０
３にて、現在の絞り径Ｒがフィルタ待避径Ｒ３より小さ
いと判断した場合には、ステップＳ５０９に進み、現在
の絞り径Ｒとフィルタ挿入径Ｒ１（第１所定値）との比
較を行う。被写体照度が高く絞り径ＲがＲ１以下である
と判断した場合は、ステップＳ５１０に進み、現在の撮
像素子１０７のシャッタースピードが１／５００秒（所
定高速秒時）より低速どうかを判断する。At step S50, the illuminance of the subject is increased.
If it is determined in step 3 that the current aperture diameter R is smaller than the filter retracting diameter R3, the process proceeds to step S509 to compare the current aperture diameter R with the filter insertion diameter R1 (first predetermined value). If it is determined that the subject illuminance is high and the aperture diameter R is equal to or smaller than R1, the process proceeds to step S510, and it is determined whether the current shutter speed of the image sensor 107 is lower than 1/500 second (at a predetermined high speed).
【００４４】１／５００秒より低速である場合は、ステ
ップＳ５１１に進み、ＮＤフィルタ１０４が挿入されて
いるかどうかを判断する。ＮＤフィルタが挿入されてい
ない場合は、ステップＳ５１１２進んでシャッタースピ
ードを徐々に高速にする。この場合、被写体照度が図６
に示すＰ５からＰ６まで徐々に高くなっていく間、ステ
ップＳ５０２の露出制御動作では、絞り径をＲ１に維持
したままで露出制御を行うことになる。If the speed is less than 1/500 second, the flow advances to step S511 to determine whether the ND filter 104 has been inserted. If the ND filter has not been inserted, the flow advances to step S5112 to gradually increase the shutter speed. In this case, the subject illuminance is
In the exposure control operation in step S502, the exposure control is performed while the aperture diameter is maintained at R1 while the height gradually increases from P5 to P6.
【００４５】ステップＳ５１０にて現在の撮像素子１０
７のシャッタースピードが１／５００秒になっていると
判断した場合には、ステップＳ５１３に進んで、ＮＤフ
ィルタ１０４が挿入されているかどうかを確認する。Ｎ
Ｄフィルタ１０４が待避している場合は、ステップＳ５
１４にてＮＤフィルタ１０４を挿入する制御信号をＮＤ
フィルタ駆動部１０３に出力すると同時にステップＳ５
１５にて、ＮＤフィルタ１０４が挿入されて光量が減少
した分だけ撮像素子１０７のシャッタースピードを低く
して、１／６０秒に戻す制御を行う。In step S510, the current image sensor 10
If it is determined that the shutter speed of No. 7 is 1/500 second, the process advances to step S513 to check whether the ND filter 104 is inserted. N
If the D filter 104 is retracted, step S5
At 14, the control signal for inserting the ND filter 104 is set to ND
At the same time as outputting to the filter driving unit 103, step S5
At 15, the shutter speed of the image sensor 107 is reduced by an amount corresponding to the decrease in the light amount due to the insertion of the ND filter 104, and control is performed to return the shutter speed to 1/60 second.
【００４６】なお、ここではシャッタースピードを１／
６０秒に下げる場合について説明したが、適正な露出に
なるのであれば特に１／６０秒でなくてもよい。Here, the shutter speed is set to 1 /
Although the case where the exposure time is reduced to 60 seconds has been described, the exposure time does not need to be particularly 1/60 second as long as the exposure is appropriate.
【００４７】ステップＳ５１３にてＮＤフィルタ１０４
が挿入されている場合、すなわち被写体照度が図６に示
すＰ１よりも高い場合は、ステップＳ５０２に戻り、絞
り径を変化させて露出制御動作を行う。In step S513, the ND filter 104
Is inserted, that is, when the subject illuminance is higher than P1 shown in FIG. 6, the process returns to step S502, and the exposure control operation is performed by changing the aperture diameter.
【００４８】次に上記の動作を図６および図７を用いて
説明する。初期状態において被写体照度が低く絞り装置
１０６の絞り径が全開Ｒｍａｘであるとき、絞り開口の
形状は図７（ａ）に示すように開放状態になる。被写体
照度が徐々に高くなって図６のＰ８に達するまでは、絞
り径Ｒがフィルタ待避径Ｒ３以上であるので、ステップ
Ｓ５０２→Ｓ５０３→Ｓ５０４→Ｓ５０７→Ｓ５０９→
Ｓ５０２という順序で動作し、シャッタースピードが１
／６０秒に設定された状態で絞り装置１０６が徐々に閉
じていく。このとき、絞り開口の形状は図７（ｂ）のよ
うにうになる。被写体照度がＰ８を超えてＰ５に近づい
ていくと、絞り径Ｒがフィルタ待避径Ｒ３より小さく、
フィルタ挿入径Ｒ１より大きいため、ステップＳ５０２
→Ｓ５０３→Ｓ５０９→Ｓ５０２という順序で動作し、
シャッタースピードが１／６０秒のままで絞り径がＲ１
になるまで徐々に閉じていく。Next, the above operation will be described with reference to FIGS. When the illuminance of the subject is low in the initial state and the aperture diameter of the aperture device 106 is fully open Rmax, the shape of the aperture opening is open as shown in FIG. Until the illuminance of the subject gradually increases and reaches P8 in FIG. 6, the aperture diameter R is equal to or larger than the filter retracting diameter R3, so that steps S502 → S503 → S504 → S507 → S509 →
It operates in the order of S502 and the shutter speed is 1
The diaphragm device 106 gradually closes in the state set to / 60 seconds. At this time, the shape of the aperture opening becomes as shown in FIG. When the subject illuminance exceeds P8 and approaches P5, the aperture diameter R is smaller than the filter retreat diameter R3,
Since it is larger than the filter insertion diameter R1, step S502
It operates in the order of → S503 → S509 → S502,
Aperture diameter is R1 with 1/60 second shutter speed
Close gradually until it becomes
【００４９】被写体照度がＰ５を超えてＰ６に達するま
では、絞り径Ｒがフィルタ挿入径Ｒ１になり、ＮＤフィ
ルタ１０４が待避位置にあり、かつシャッタースピード
が１／５００秒より低速であるため、ステップＳ５０２
→Ｓ５０３→Ｓ５０９→Ｓ５１０→Ｓ５１１→Ｓ５１２
→Ｓ５０２という順序で動作し、絞り径をＲ１に維持し
たままで露出の制御を行い、絞り開口の形状は図７
（ｃ）のようになる。Until the illuminance of the object exceeds P5 and reaches P6, the aperture diameter R becomes the filter insertion diameter R1, the ND filter 104 is at the retreat position, and the shutter speed is lower than 1/500 second. Step S502
→ S503 → S509 → S510 → S511 → S512
→ The operation is performed in the order of S502, exposure is controlled while the aperture diameter is maintained at R1, and the shape of the aperture opening is as shown in FIG.
(C).
【００５０】被写体照度が図６に示すＰ６に達すると、
シャッタースピードが１／５００秒に達するため、ステ
ップＳ５１０→Ｓ５１３→Ｓ５１４→Ｓ５１５→Ｓ５０
２の順序で動作し、ＮＤフィルタ１０４が挿入されてシ
ャッタースピードも１／６０秒になり、絞り開口の形状
は図７（ｄ）のようになる。When the subject illuminance reaches P6 shown in FIG.
Since the shutter speed reaches 1/500 second, steps S510 → S513 → S514 → S515 → S50
2, the ND filter 104 is inserted, the shutter speed is also reduced to 1/60 second, and the shape of the aperture opening is as shown in FIG.
【００５１】さらに被写体照度が高くなると、絞り装置
１０６をさらに閉じる制御を行い、絞り開口の形状は図
７（ｅ）のようになる。When the illuminance of the object is further increased, control for further closing the aperture device 106 is performed, and the shape of the aperture opening is as shown in FIG.
【００５２】一方、この状態から被写体照度が徐々に暗
くなる場合は、ＮＤフィルタ１０４が挿入されているた
めにシャッタースピードは１／６０秒のまま、絞り径が
Ｒ３になるまで（照度がＰ７に達するまで）絞り径が開
いていき、絞り開口の形状は図７（ｄ’）のようにな
る。On the other hand, if the illuminance of the subject gradually decreases from this state, the shutter speed remains at 1/60 second because the ND filter 104 is inserted until the aperture diameter reaches R3 (the illuminance becomes P7). The aperture diameter is increased until the aperture is reached), and the shape of the aperture opening is as shown in FIG.
【００５３】さらに照度が暗くなって照度がＰ７に達す
ると、絞り径はＲ３より大きくなろうとするため、ステ
ップＳ５０３→Ｓ５０４→Ｓ５０５→Ｓ５０６→Ｓ５０
２の順序で動作し、ＮＤフィルタ１０４が待避するとと
もに、シャッタースピードが１／５００秒になる。When the illuminance further decreases and the illuminance reaches P7, the aperture diameter tends to be larger than R3, so that steps S503 → S504 → S505 → S506 → S50.
2 and the ND filter 104 is retracted, and the shutter speed is reduced to 1/500 second.
【００５４】これ以降、照度がＰ８に達するまでは、シ
ャッタースピードが１／６０秒に下がるまで絞り径はＲ
３に維持され、絞り開口の形状は図７（ｃ′）のように
なる。Thereafter, until the illuminance reaches P8, the aperture diameter remains at R until the shutter speed decreases to 1/60 second.
3 and the shape of the aperture opening is as shown in FIG. 7 (c ').
【００５５】ここで、プログラム線図の途中で被写体照
度が変化した場合について説明する。例えば図６のＰ９
まで被写体照度が高くなっていき、図６中の点ＰＭ１に
なった時点で照度が低く変化した場合を例に説明する。
点ＰＭ１における絞り径はＲ１でシャッタースピードは
１／４００秒である。ここで照度が暗くなり、Ｐ１０に
なると、シャッタースピードは１／４００のままで、絞
り径がＲ３になるまで絞り装置１０６が開いていき、点
ＰＮ１の状態になる。さらにＰ１１まで暗くなると、絞
り径はＲ３のままでシャッタースピードが１／２５０秒
まで徐々に低くなるように制御される（点ＰＮ２）。照
度がＰ１１まで下がり、再び照度が高くなると、点ＰＮ
２からシャッタースピードは１／２５０秒のままで絞り
径がＲ１になる点ＰＭ２まで絞り径が小さくなように制
御される。Here, a case where the subject illuminance changes in the middle of the program diagram will be described. For example, P9 in FIG.
A description will be given of an example in which the illuminance of the subject increases until the point PM1 in FIG.
The aperture diameter at the point PM1 is R1 and the shutter speed is 1/400 second. Here, when the illuminance becomes dark and becomes P10, the shutter speed is kept at 1/400, the aperture device 106 is opened until the aperture diameter becomes R3, and the state of the point PN1 is reached. When the shutter speed further decreases to P11, the shutter speed is controlled so as to gradually decrease to 1/250 second while the aperture diameter remains at R3 (point PN2). When the illuminance decreases to P11 and increases again, the point PN
From 2, the shutter speed is controlled so that the aperture diameter is reduced to a point PM2 at which the aperture diameter becomes R1 while the shutter speed remains 1/250 second.
【００５６】以上説明した本実施形態の撮像装置によれ
ば、ＮＤフィルタ１０４を絞り開口に対して完全に覆う
位置（挿入位置）と完全に待避する位置（待避位置）と
でのみ移動制御することにより、ＮＤフィルタ１０４が
不完全に絞り開口を覆う状態をなくし、回折やシェーデ
ィングを防止して撮像画質を向上させることができる。According to the image pickup apparatus of the present embodiment described above, the movement is controlled only at the position where the ND filter 104 is completely covered with respect to the aperture opening (insertion position) and the position where it is completely retracted (retracted position). Accordingly, the state in which the ND filter 104 incompletely covers the aperture opening can be eliminated, and diffraction and shading can be prevented to improve image quality.
【００５７】また、ＮＤフィルタ１０４が待避位置にあ
る状態で絞り開口がフィルタ挿入径Ｒ１まで小さくな
り、かつシャッタースピードが１／５００秒まで高速に
なると、ＮＤフィルタ１０４を挿入位置に移動させると
ともにシャッタースピードを１／６０秒まで低速にする
ので、広い被写体照度の範囲で回折等を生じさせずに撮
像を行うことができる。When the aperture opening is reduced to the filter insertion diameter R1 and the shutter speed is increased to 1/500 second with the ND filter 104 in the retracted position, the ND filter 104 is moved to the insertion position and the shutter is moved. Since the speed is reduced to 1/60 second, imaging can be performed in a wide range of subject illuminance without causing diffraction or the like.
【００５８】しかも、第１実施形態においては、ＮＤフ
ィルタ１０４の挿入・待避に伴って絞り径を大きく変化
させているが、本実施形態では、そのような絞り径の大
きな変化をなくすことも可能になる。Further, in the first embodiment, the aperture diameter is greatly changed in accordance with insertion / retraction of the ND filter 104, but in this embodiment, such a large change in the aperture diameter can be eliminated. become.
【００５９】さらに、ＮＤフィルタ１０４を待避位置か
ら挿入位置に移動させるときの被写体照度Ｐ６を、挿入
位置から待避位置に移動させるときの被写体照度Ｐ７よ
りも高くしてヒステリシスを持たせているので、これら
照度の付近でシャッタースピードの大きな変化が頻繁に
起こることを防止できる。Further, since the subject illuminance P6 when the ND filter 104 is moved from the retracted position to the insertion position is higher than the subject illuminance P7 when the ND filter 104 is moved from the inserted position to the retracted position, hysteresis is provided. Frequent large changes in shutter speed near these illuminances can be prevented.
【００６０】[0060]
【発明の効果】以上説明したように、本願第１および第
２の発明によれば、従来の問題であった減光フィルタと
絞り羽根との隙間の部分を通過する光と減光フィルタの
部分を通過する光の光束の差によってシェーディングや
回折が発生することを防止できる。しかも、被写体照度
の明るい側において従来より広い範囲で高画質の撮像を
行うことができる。As described above, according to the first and second aspects of the present invention, the light passing through the gap between the neutral density filter and the aperture blade, which is a conventional problem, and the portion of the neutral density filter are reduced. Can prevent shading and diffraction from occurring due to the difference in the luminous flux of the light passing therethrough. In addition, it is possible to perform high-quality imaging in a wider range than before in the bright side of the subject illuminance.
【００６１】なお、上記各発明において、減光フィルタ
を待避位置から挿入位置に移動させるときの被写体照度
を、減光フィルタを挿入位置から待避位置に移動させる
ときの被写体照度よりも高くして、ヒステリシスを持た
せれば、減光フィルタの移動制御や撮像時間の変化が頻
繁に起こることを防止することができ、使い勝手のよい
撮像装置を実現することができる。In each of the above inventions, the illuminance of the subject when the dimming filter is moved from the retracted position to the insertion position is made higher than the illuminance of the subject when the dimming filter is moved from the insertion position to the retracted position. If hysteresis is provided, frequent changes in the movement control of the neutral density filter and changes in the imaging time can be prevented, and a user-friendly imaging device can be realized.
【図１】本発明の第１実施形態である撮像装置のブロッ
ク図。FIG. 1 is a block diagram of an imaging apparatus according to a first embodiment of the present invention.
【図２】上記第１実施形態の撮像装置の光量制御部の動
作を示すフローチャート。FIG. 2 is a flowchart illustrating an operation of a light amount control unit of the imaging apparatus according to the first embodiment.
【図３】上記第１実施形態の光量制御部のプログラム線
図。FIG. 3 is a program diagram of a light amount control unit according to the first embodiment.
【図４】上記第１実施形態の撮像装置における絞り羽根
とＮＤフィルタの動作を示す説明図。FIG. 4 is an explanatory diagram showing operations of an aperture blade and an ND filter in the imaging device of the first embodiment.
【図５】本発明の第２実施形態である撮像装置の光量制
御部の動作を示すフローチャート。FIG. 5 is a flowchart illustrating an operation of a light amount control unit of the imaging device according to the second embodiment of the present invention.
【図６】上記第２実施形態の光量制御部のプログラム線
図。FIG. 6 is a program diagram of a light quantity control unit according to the second embodiment.
【図７】上記第２実施形態の撮像装置における絞り羽根
とＮＤフィルタの動作を示す説明図。FIG. 7 is an explanatory diagram showing operations of an aperture blade and an ND filter in the imaging device of the second embodiment.
【図８】従来の撮像装置のプログラム線図。FIG. 8 is a program diagram of a conventional imaging apparatus.
【図９】従来の撮像装置における絞り羽根とＮＤフィル
タの動作を示す説明図。FIG. 9 is an explanatory diagram showing the operation of a diaphragm blade and an ND filter in a conventional imaging apparatus.
１００ 撮像光学系の光軸 １０１，１０２ 撮像光学系レンズ １０３ ＮＤフィルタ駆動部 １０４ ＮＤフィルタ １０５ 絞り駆動部 １０６ 絞り装置 １０７ 撮像素子 １０８ 映像信号処理回路 １０９ 撮像素子駆動回路 １１０ 光量制御部 １１１ 絞り径検出部 Reference Signs List 100 optical axis of imaging optical system 101, 102 imaging optical system lens 103 ND filter driving unit 104 ND filter 105 aperture driving unit 106 aperture device 107 imaging element 108 video signal processing circuit 109 imaging element driving circuit 110 light amount control unit 111 aperture diameter detection Department
Claims (8)
口の大きさを変更する絞り手段と、絞り開口全体を覆う
挿入位置と絞り開口全体から待避する待避位置との間で
移動する減光フィルタと、前記撮像手段を通じて検出さ
れた被写体照度に応じて前記絞り手段を制御するととも
に前記減光フィルタの移動を制御する制御手段とを有す
る撮像装置において、 前記制御手段は、前記減光フィルタが前記待避位置に位
置した状態で絞り開口の大きさが第１所定値になったと
きは、前記減光フィルタを前記挿入位置に移動させると
同時に前記絞り手段に絞り開口を前記第１所定値より大
きくさせる制御を行うことを特徴とする撮像装置。1. A diaphragm means for changing the size of a diaphragm opening for determining the amount of light incident on an image pickup means, and a dimming device which moves between an insertion position covering the entire diaphragm opening and a retracted position retracted from the entire diaphragm opening. An image pickup apparatus comprising: a filter; and a control unit configured to control the diaphragm unit in accordance with the illuminance of a subject detected through the imaging unit and to control a movement of the neutral density filter. When the size of the aperture opening reaches the first predetermined value in the retracted position, the dimming filter is moved to the insertion position and at the same time, the aperture unit is moved from the first predetermined value to the aperture means. An imaging apparatus, which performs control to increase the size.
記挿入位置に位置した状態で絞り開口の大きさが前記第
１所定値よりも大きい第２所定値になったときは、前記
減光フィルタを前記待避位置に移動させると同時に前記
絞り手段に絞り開口を前記第２所定値より小さくさせる
制御を行うことを特徴とする請求項１に記載の撮像装
置。2. When the size of the aperture opening reaches a second predetermined value larger than the first predetermined value in a state where the neutral density filter is located at the insertion position, the control means controls the light reduction. 2. The imaging apparatus according to claim 1, wherein the filter is moved to the retracted position and, at the same time, control is performed by the diaphragm means to make the diaphragm opening smaller than the second predetermined value.
口の大きさを変更する絞り手段と、絞り開口全体を覆う
挿入位置と絞り開口全体から待避する待避位置との間で
移動する減光フィルタと、前記撮像手段を通じて検出さ
れた被写体照度に応じて前記絞り手段を制御するととも
に前記撮像手段の撮像時間および前記減光フィルタの移
動を制御する制御手段とを有する撮像装置において、 前記制御手段は、前記減光フィルタが前記待避位置に位
置し、かつ露出時間が所定高速秒時である状態で絞り開
口の大きさが第１所定値になったときは、前記減光フィ
ルタを前記挿入位置に移動させると同時に露出時間を前
記所定高速秒時より低速にする制御を行うことを特徴と
する撮像装置。3. A diaphragm means for changing the size of the diaphragm opening for determining the amount of light incident on the image pickup means, and a dimming device which moves between an insertion position covering the entire diaphragm opening and a retract position retracted from the entire diaphragm opening. An image pickup apparatus comprising: a filter; and control means for controlling the diaphragm means in accordance with the illuminance of a subject detected through the image pickup means, and for controlling an image pickup time of the image pickup means and movement of the neutral density filter. When the size of the aperture opening reaches a first predetermined value in a state where the neutral density filter is located at the retreat position and the exposure time is a predetermined high-speed second, the neutral density filter is moved to the insertion position. And an exposure device that controls the exposure time to be lower than the predetermined high-speed second at the same time.
記待避位置に位置し、かつ露出時間が前記所定高速秒時
より低速である状態で絞り開口の大きさが第１所定値と
なったときは、被写体照度が高くなるに従って、絞り開
口の大きさを前記第１所定値に維持したまま露出時間を
前記所定高速秒時に向かって高速にする制御を行うこと
を特徴とする請求項３に記載の撮像装置。4. The control device according to claim 1, wherein the size of the aperture opening reaches a first predetermined value in a state where the neutral density filter is located at the retraction position and the exposure time is lower than the predetermined high speed second. 4. The control method according to claim 3, wherein, as the illuminance of the subject increases, the exposure time is increased toward the predetermined high-speed second while the size of the aperture opening is maintained at the first predetermined value. An imaging device according to any one of the preceding claims.
記挿入位置に位置し、かつ露出時間が所定低速秒時であ
る状態で絞り開口の大きさが前記第１所定値よりも大き
い第２所定値になったときは、前記減光フィルタを前記
待避位置に移動させると同時に露出時間を前記所定低速
秒時より高速にする制御を行うことを特徴とする請求項
４に記載の撮像装置。5. The control unit according to claim 2, wherein the size of the aperture is larger than the first predetermined value when the neutral density filter is located at the insertion position and the exposure time is a predetermined low speed second. 5. The imaging apparatus according to claim 4, wherein when the predetermined value is reached, the control is performed such that the neutral density filter is moved to the retreat position and the exposure time is made faster than the predetermined low speed second.
記待避位置に位置し、かつ露出時間が前記所定低速秒時
より高速である状態で絞り開口の大きさが前記第２所定
値になったときは、被写体照度が低くなるに従って、絞
り開口の大きさを前記第２所定値に維持したまま露出時
間を前記所定低速秒時に向かって低速にする制御を行う
ことを特徴とする請求項５に記載の撮像装置。6. The control unit according to claim 1, wherein the size of the aperture opening reaches the second predetermined value in a state where the neutral density filter is located at the standby position and the exposure time is higher than the predetermined low speed second. And controlling the exposure time to decrease toward the predetermined low-speed time while maintaining the size of the aperture at the second predetermined value as the illuminance of the subject decreases. An imaging device according to claim 1.
限界値よりも大きいことを特徴とする請求項１から６の
いずれかに記載の撮像装置。7. The imaging apparatus according to claim 1, wherein the first predetermined value is larger than a diffraction limit value of the diaphragm.
記待避位置から前記挿入位置に移動させるときの被写体
照度を、前記減光フィルタを前記挿入位置から前記待避
位置に移動させるときの被写体照度よりも高くしたこと
を特徴とする請求項２、５又は６に記載の撮像装置。8. The illuminance of a subject when the neutral density filter is moved from the retracted position to the insertion position, and the illuminance of a subject when the neutral density filter is moved from the insertion position to the retracted position. The imaging device according to claim 2, 5 or 6, wherein the height is higher than the height.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02093898A JP3697047B2 (en) | 1998-02-02 | 1998-02-02 | Imaging device |
| US11/558,975 US7567286B2 (en) | 1998-02-02 | 2006-11-13 | Image pickup apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02093898A JP3697047B2 (en) | 1998-02-02 | 1998-02-02 | Imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11220652A true JPH11220652A (en) | 1999-08-10 |
| JP3697047B2 JP3697047B2 (en) | 2005-09-21 |
Family
ID=12041160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02093898A Expired - Fee Related JP3697047B2 (en) | 1998-02-02 | 1998-02-02 | Imaging device |
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| Country | Link |
|---|---|
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003116026A (en) * | 2001-10-03 | 2003-04-18 | Olympus Optical Co Ltd | Imaging device and method for displaying its exposure |
| JP2008003408A (en) * | 2006-05-23 | 2008-01-10 | Canon Inc | Optical apparatus and device for adjusting quantity of light |
| US7365791B2 (en) * | 2002-08-08 | 2008-04-29 | Canon Kabushiki Kaisha | Image pickup apparatus having iris member and filter units |
| US7450170B2 (en) | 2003-07-24 | 2008-11-11 | Sony Corporation | Exposure control method of imaging apparatus |
| KR20150069345A (en) * | 2013-12-13 | 2015-06-23 | 삼성테크윈 주식회사 | System for controlling camera |
| JPWO2015137148A1 (en) * | 2014-03-14 | 2017-04-06 | ソニー株式会社 | Imaging device, iris device, imaging method, and program |
-
1998
- 1998-02-02 JP JP02093898A patent/JP3697047B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003116026A (en) * | 2001-10-03 | 2003-04-18 | Olympus Optical Co Ltd | Imaging device and method for displaying its exposure |
| US7365791B2 (en) * | 2002-08-08 | 2008-04-29 | Canon Kabushiki Kaisha | Image pickup apparatus having iris member and filter units |
| US7876376B2 (en) | 2002-08-08 | 2011-01-25 | Canon Kabushiki Kaisha | Image pickup apparatus having iris member and filter units |
| US7995139B2 (en) | 2002-08-08 | 2011-08-09 | Canon Kabushiki Kaisha | Image pickup apparatus having iris member and filter units |
| US7450170B2 (en) | 2003-07-24 | 2008-11-11 | Sony Corporation | Exposure control method of imaging apparatus |
| JP2008003408A (en) * | 2006-05-23 | 2008-01-10 | Canon Inc | Optical apparatus and device for adjusting quantity of light |
| JP4510783B2 (en) * | 2006-05-23 | 2010-07-28 | キヤノン株式会社 | Optical equipment |
| KR20150069345A (en) * | 2013-12-13 | 2015-06-23 | 삼성테크윈 주식회사 | System for controlling camera |
| JPWO2015137148A1 (en) * | 2014-03-14 | 2017-04-06 | ソニー株式会社 | Imaging device, iris device, imaging method, and program |
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| Publication number | Publication date |
|---|---|
| JP3697047B2 (en) | 2005-09-21 |
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