JP2987457B2 - Imaging device - Google Patents
Imaging deviceInfo
- Publication number
- JP2987457B2 JP2987457B2 JP4082343A JP8234392A JP2987457B2 JP 2987457 B2 JP2987457 B2 JP 2987457B2 JP 4082343 A JP4082343 A JP 4082343A JP 8234392 A JP8234392 A JP 8234392A JP 2987457 B2 JP2987457 B2 JP 2987457B2
- Authority
- JP
- Japan
- Prior art keywords
- signal charge
- charge accumulation
- mode
- signal
- readout
- 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.)
- Expired - Fee Related
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Description
【０００１】[0001]
【産業上の利用分野】本発明は撮像装置、詳しくは画質
を向上させた撮像装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup apparatus, and more particularly to an image pickup apparatus having improved image quality.
【０００２】[0002]
【従来の技術】一般に電子シャッタ機能を有する撮像装
置では、その光電変換部の全画素にそれまでに蓄積され
ていた不要電荷を排出パルスにより一斉に排出し、その
後所望のシャッタ速に対応した露光時間に蓄積された信
号電荷を読出しパルスにより読出すことにより露出が行
われる。この読出し時に全画素の信号電荷を同時に読み
出すと、装置内の基準電位が揺さぶられて有効電荷の読
出し残りを生じるので、読出しパルスを数μＳｅｃの時
間差を有するＳＧ１，ＳＧ２に分けて各別に読出すよう
にしている。2. Description of the Related Art In general, in an image pickup apparatus having an electronic shutter function, unnecessary charges accumulated up to that time in all pixels of a photoelectric conversion unit are simultaneously discharged by a discharge pulse, and thereafter, an exposure corresponding to a desired shutter speed is performed. Exposure is performed by reading out the signal charges accumulated at the time with a readout pulse. If the signal charges of all the pixels are simultaneously read at the time of this reading, the reference potential in the device is fluctuated, and the remaining effective charges are left unread. Like that.
【０００３】これを図３〜５により説明する。図３は、
インターライン型ＣＣＤの構成を示す模式図で、２次元
に配置された光電変換部１１ａ，１１ｂ，１１ｃ，１１
ｄ，…，１１ｉ，１１ｊ，１１ｋ，１１ｍ，…の各列の
間に垂直転送レジスタ１２ａ，１２ｂ，…が配置され、
これら各レジスタ１２ａ，１２ｂ，…の転送電荷を水平
転送レジスタ１３に集めて順次出力するようになってい
る。[0003] This will be described with reference to FIGS. FIG.
FIG. 2 is a schematic diagram showing a configuration of an interline CCD, in which photoelectric conversion units 11a, 11b, 11c, and 11 are two-dimensionally arranged.
, 11i, 11j, 11k, 11m,..., vertical transfer registers 12a, 12b,.
Transfer charges of these registers 12a, 12b,... Are collected in the horizontal transfer register 13 and sequentially output.
【０００４】図４は、上記図３に示すＣＣＤ撮像素子を
用いた従来の撮像装置のブロック構成図で、被写体光を
後記ＣＣＤ撮像素子２の受光面上に結像する撮像光学系
１と、この光学系１を透過した被写体光を電気信号に光
電変換するＣＣＤ撮像素子２と、該撮像素子２から出力
されたＣＣＤ出力を信号処理して映像信号を出力するカ
メラプロセス処理部３と、この処理部３からの露出情報
（通常は輝度情報が用いられる）を受けて露出制御する
露出制御部５と、この制御部５からの電子シャッタ（露
出時間）制御信号を受けて上記ＣＣＤ撮像素子２に所望
のシャッタ速の電子シャッタ動作を行わせるＣＣＤ駆動
信号を出力するＣＣＤ駆動信号発生部４と、上記露出制
御部５からのストロボ発光制御信号を受けて閃光発光す
るストロボ発光部６とからその主要部が構成されてい
る。FIG. 4 is a block diagram of a conventional image pickup apparatus using the CCD image pickup device shown in FIG. 3 described above. The image pickup optical system 1 forms an object light on a light receiving surface of the CCD image pickup device 2 described below. A CCD image pickup device 2 for photoelectrically converting subject light transmitted through the optical system 1 into an electric signal; a camera process processing unit 3 for processing a CCD output output from the image pickup device 2 to output a video signal; An exposure control unit 5 for controlling exposure by receiving exposure information (usually luminance information is used) from the processing unit 3; and an electronic shutter (exposure time) control signal from the control unit 5 to control the CCD image sensor 2 A CCD drive signal generator 4 for outputting a CCD drive signal for causing an electronic shutter operation at a desired shutter speed, and a flash light emitter for emitting a flash light in response to a strobe light emission control signal from the exposure controller 5. The main portion is composed of a.
【０００５】図５は、上記図４に示す撮像装置における
光電変換動作のタイミングチャートで、垂直ブランキン
グ信号ＶＢＬＫが“Ｌ”レベルの期間が垂直ブランキン
グ期間である。この垂直ブランキング期間内に、露光つ
まり信号電荷蓄積期間の終期に相当する読出しパルスＳ
Ｇ１，ＳＧ２を送出できるように、該読出しパルス送出
時より信号電荷蓄積時間だけ溯って排出パルスＳＵＢが
送出される。この読出しパルスＳＧ１，ＳＧ２は通常転
送パルスに重畳して送出されるようになっていて、これ
を同時に出力すると、前述したようにＣＣＤの基準電位
が揺すられて信号電荷の読み残しを生じて画質が劣化す
るので、通常は数μＳｅｃ異ならせている。FIG. 5 is a timing chart of the photoelectric conversion operation in the image pickup apparatus shown in FIG. 4, and a period in which the vertical blanking signal VBLK is at "L" level is a vertical blanking period. During this vertical blanking period, the read pulse S corresponding to the end of the exposure, that is, the end of the signal charge accumulation period.
The discharge pulse SUB is transmitted back by the signal charge accumulation time from the transmission of the read pulse so that G1 and SG2 can be transmitted. These readout pulses SG1 and SG2 are normally superimposed on the transfer pulse and sent out. If they are output simultaneously, the reference potential of the CCD fluctuates as described above, resulting in unread signal charges and image quality. Is usually deteriorated by several μSec.
【０００６】即ち、前記図３に示す第１行の各画素１１
ａ，１１ｉ，…や第３行の各画素１１ｃ，１１ｋ…のよ
うに奇数行の各画素に蓄積された信号電荷を第１の読出
しパルスＳＧ１によって、また第２行の各画素１１ｂ，
１１ｊ…や第４行の各画素１１ｄ，１１ｍ，…のように
偶数行の各画素に蓄積された信号電荷を上記読出しパル
スＳＧ１より数μＳのずれを有する第２の読出しパルス
ＳＧ２によって、それぞれ読出すようにしている。この
信号電荷蓄積期間の終期近傍期間における上記数μＳｅ
ｃ内での信号電荷蓄積は、通常のシャッタ速1/60〜1/20
00秒程度では、信号電荷蓄積期間全体での信号電荷蓄積
に対して無視できるので、上記数μＳｅｃの時間差は問
題にならない。That is, each pixel 11 in the first row shown in FIG.
a, 11i,... and the third row of pixels 11c, 11k,..., and the signal charges accumulated in the odd rows of the pixels are read by the first read pulse SG1, and the second row of pixels 11b,
, And the signal charges accumulated in the pixels of the even-numbered rows, such as the pixels 11d, 11m,... Of the fourth row, are read by the second read-out pulse SG2 having a deviation of several μS from the read-out pulse SG1. I'm trying to put it out. The above several μSe in the period near the end of the signal charge accumulation period
The signal charge accumulation in c is a normal shutter speed of 1/60 to 1/20
In about 00 seconds, the signal charge accumulation in the entire signal charge accumulation period can be neglected, so the time difference of several μSec does not matter.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、シャッ
タ速が、1/2000秒を超えるような高速シャッタ時になる
と、上記信号電荷蓄積期間の終期近傍期間における上記
数μＳｅｃによる信号電荷蓄積が、撮像素子の信号電荷
蓄積期間全体での信号電荷蓄積に対して無視できなくな
り、輝度ムラや色相のズレになって画質に悪影響を与え
ることになる。この点は、例えばストロボ発光時にその
発光途中で、上記読出しパルスＳＧ１，ＳＧ２により露
光終了を行う場合にも当て嵌まり、特に近距離ストロボ
時に顕著に表われる。However, when the shutter speed is high, such as when the shutter speed exceeds 1/2000 second, the signal charge accumulation due to the several μSec in the period near the end of the signal charge accumulation period is caused by the image pickup device. The signal charge accumulation during the entire signal charge accumulation period cannot be ignored, resulting in luminance unevenness and hue shift, which adversely affects image quality. This applies, for example, to the case where the exposure is terminated by the readout pulses SG1 and SG2 during the flash emission, for example, during the flash emission, and is particularly noticeable when the flash is short-distance.
【０００８】そこで本発明の目的は、上記問題点を解消
し、撮像素子の信号電荷蓄積期間の終期近傍期間での信
号電荷蓄積が、信号電荷蓄積期間全体での信号電荷蓄積
に対して占める割合の如何に拘らず、画質劣化の少ない
撮像装置を提供するにある。Accordingly, an object of the present invention is to solve the above-mentioned problem, and to describe a ratio of signal charge accumulation in a period near the end of a signal charge accumulation period of an image pickup device to signal charge accumulation in the entire signal charge accumulation period. Regardless of the above, an object of the present invention is to provide an imaging device with little image quality deterioration.
【０００９】[0009]
【課題を解決するための手段および作用】本発明の撮像
装置は、撮像素子の全光電変換部の内の一部および他部
に対して実質的にタイミングのずれがない各別の読出し
パルスを与えて信号電荷を読み出す第１の態様の信号電
荷読出し動作と、撮像素子の全光電変換部の内の一部お
よび他部に対して実質的にタイミングのずれた各別の読
出しパルスを与えて信号電荷を読み出す第２の態様の信
号電荷読出し動作と、を選択的に実行可能になされた信
号電荷読出し手段と、当該撮影が、撮像素子の信号電荷
蓄積期間の終期近傍期間での信号電荷蓄積が信号電荷蓄
積期間全体での信号電荷蓄積に対して占める割合が比較
的大きい第１の態様の撮影かまたは第１の態様とは異な
る第２の態様の撮影かに応じて、上記第１の態様の撮影
を行うときには上記信号電荷読出し手段に上記第１の態
様の信号電荷読出し動作を行わしめ、上記第２の態様の
撮影を行うときには上記信号電荷読出し手段に上記第２
の態様の信号電荷読出し動作を行わしめる信号電荷読出
し態様選択手段と、を有してなることを特徴とする。According to the present invention, there is provided an image pickup apparatus which outputs each read pulse having substantially no timing shift with respect to a part and another part of all photoelectric conversion units of an image pickup device. The signal charge readout operation of the first mode in which the readout is performed and the signal charge is read out, and each readout pulse which is substantially shifted in timing is given to a part and another part of all the photoelectric conversion units of the image sensor. A signal charge readout means capable of selectively executing the signal charge readout operation of the second mode for reading out the signal charge, and the imaging being performed in a period near the end of the signal charge accumulation period of the image pickup device. Depends on whether the imaging in the first mode or the imaging in the second mode different from the first mode has a relatively large ratio of signal charge accumulation in the entire signal charge accumulation period. When shooting the aspect The signal charge reading means tightening perform signal charge read operation of the first embodiment, the second in the signal charge reading means at the time of imaging of the second aspect
And a signal charge readout mode selecting means for performing the signal charge readout operation of the above aspect.
【００１０】[0010]
【実施例】以下、図面を参照して本発明の実施例を説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１１】図２は本発明の一実施例を示す撮像装置の
要部ブロック構成図で、上記従来例における図４と異な
る点は、露出制御部５からＣＣＤ駆動信号発生部４に向
け、電子シャッタ制御信号に加えて読出しモード切換え
信号ＳＧＭＤをも印加するようにした点である。この点
を除けば上記従来例と異なるところがないので、同じ構
成部材には同じ符号を付してその説明を省略し、上記モ
ード切換え信号についてのみ以下に説明する。FIG. 2 is a block diagram of a main part of an image pickup apparatus according to an embodiment of the present invention. The difference from FIG. The point is that a read mode switching signal SGMD is applied in addition to the shutter control signal. Except for this point, there is no difference from the above-described conventional example. Therefore, the same components are denoted by the same reference numerals, and description thereof will be omitted. Only the mode switching signal will be described below.
【００１２】この読出しモード切換え信号ＳＧＭＤは、
撮像素子の信号電荷蓄積期間の終期近傍期間での信号電
荷蓄積の、信号電荷蓄積期間全体での信号電荷蓄積に対
して占める割合が無視できないような、例えば1/2000秒
以上の高速シャッタ時とかストロボ発光時等と、上記割
合が無視できるような例えば1/60〜1/2000秒程度の通常
のシャッタ速の場合とに応じて、上記読出しパルスＳＧ
１，ＳＧ２の送出タイミングのズレを実質的になくした
り、あるいはタイミングのズレを従来例のように設けた
りする切換え動作を行う信号である。The read mode switching signal SGMD is
For example, at the time of a high-speed shutter of 1/2000 second or more, the ratio of signal charge accumulation in the period near the end of the signal charge accumulation period of the image sensor to the signal charge accumulation in the entire signal charge accumulation period cannot be ignored. The read pulse SG is set according to the time of flash emission or the like, and the case of a normal shutter speed of, for example, about 1/60 to 1/2000 seconds at which the above ratio can be ignored.
1, SG2, which is a signal for performing a switching operation for substantially eliminating the shift in the transmission timing or providing the shift in timing as in the conventional example.
【００１３】そして、この読出しモード切換え信号ＳＧ
ＭＤにより、撮像素子の信号電荷蓄積期間の終期近傍期
間での信号電荷蓄積が信号電荷蓄積期間全体での信号電
荷蓄積に対して占める割合が比較的大きい場合には、撮
像素子の全光電変換部の内の一部および他部に対して実
質的にタイミングのずれがない各別の読出しパルスを与
えて信号電荷を読み出す第１野態様の信号電荷読出し動
作を行う第１の態様の撮影を行う。The read mode switching signal SG
According to MD, when the ratio of signal charge accumulation in the period near the end of the signal charge accumulation period of the image pickup device to the signal charge accumulation in the entire signal charge accumulation period is relatively large, all the photoelectric conversion units of the image pickup device A first mode of performing a signal charge readout operation of a first mode in which a signal charge is read out by applying a separate readout pulse having substantially no timing shift to a part and the other part of the signal charges is performed. .
【００１４】一方、上記の占める割合が比較的小さい場
合には、撮像素子の全光電変換部の内の一部および他部
に対して実質的にタイミングのずれた各別の読出しパル
スを与えて信号電荷を読み出す第２の態様の信号電荷読
出し動作を行う第２の態様の撮影を行う。On the other hand, when the above occupying ratio is relatively small, each read pulse with a substantially shifted timing is given to a part and another part of all the photoelectric conversion units of the image sensor. Photographing is performed in the second mode for performing the signal charge readout operation in the second mode for reading out signal charges.
【００１５】なお、撮像素子の全光電変換部の内の一部
および他部、例えば前記図３における奇数行の光電変換
部と偶数行の光電変換部、に対して実質的にタイミング
のずれがない各別の読出しパルスを与えて信号電荷を読
み出す第１の態様の信号電荷読出し動作と、撮像素子の
全光電変換部の内の一部および他部に対して実質的にタ
イミングのずれた各別の読出しパルスを与えて信号電荷
を読み出す第２の態様の信号電荷読出し動作と、を選択
的に実行可能になされた信号電荷読出し手段と、当該撮
影が、撮像素子の信号電荷蓄積期間の終期近傍期間での
信号電荷蓄積が信号電荷蓄積期間全体での信号電荷蓄積
に対して占める割合が比較的大きい第１の態様の撮影か
または第１の態様とは異なる第２の態様の撮影かに応じ
て、上記第１の態様の撮影を行うときには上記信号電荷
読出し手段に上記第１の態様の信号電荷読出し動作を行
わしめ、上記第２の態様の撮影を行うときには上記信号
電荷読出し手段に上記第２の態様の信号電荷読出し動作
を行わしめる信号電荷読出し態様選択手段とが、ＣＣＤ
駆動信号発生部４と露出制御部５とで構成されている。It should be noted that there is a substantial difference in timing between some and all of the photoelectric conversion units of the image sensor, for example, the odd-numbered photoelectric conversion units and the even-numbered photoelectric conversion units in FIG. The signal charge readout operation of the first mode in which the signal charge is read out by giving each other readout pulse, and each of the signal charge readout operations substantially deviated in timing with respect to a part and the other part of all the photoelectric conversion units of the imaging device A signal charge readout unit configured to selectively execute a signal charge readout operation according to a second mode of reading out a signal charge by giving another readout pulse, and that the photographing is performed at the end of the signal charge accumulation period of the image sensor. Whether the imaging in the first mode or the imaging in the second mode different from the first mode, in which the ratio of signal charge accumulation in the nearby period to the signal charge accumulation in the entire signal charge accumulation period is relatively large. Accordingly, the first state When the photographing is performed, the signal charge reading means performs the signal charge reading operation of the first mode. When the photographing of the second mode is performed, the signal charge reading means performs the signal charge reading operation of the second mode. A signal charge readout mode selecting means for performing an operation;
It comprises a drive signal generator 4 and an exposure controller 5.
【００１６】このように構成された本実施例の動作を図
１のタイミングチャートにより説明する。例えば1/60〜
1/2000秒程度の通常のシャッタ速の場合には、上記読出
しモード切換え信号ＳＧＭＤが“Ｈ”レベルに設定され
る。すると、各光電変換部では、排出パルスＳＵＢ３１
が印加されて不要電荷が排出されてから、信号電荷の蓄
積動作が開始され、垂直ブランキング期間に入って該蓄
積動作を終了せしめる読出しパルスＳＧ１，ＳＧ２の送
出タイミングの設定が、３２と３３に示すように従来と
同じく略５μＳｅｃのずれを有する。The operation of the embodiment constructed as described above will be described with reference to the timing chart of FIG. For example, 1/60 ~
At a normal shutter speed of about 1/2000 seconds, the read mode switching signal SGMD is set to the "H" level. Then, in each photoelectric conversion unit, the discharge pulse SUB31
Is applied and the unnecessary charge is discharged, the signal charge accumulating operation is started, and the transmission timing of the read pulses SG1 and SG2 for entering the vertical blanking period and terminating the accumulating operation is set to 32 and 33. As shown, there is a shift of about 5 μSec as in the conventional case.
【００１７】これに対して、1/2000秒以上の高速シャッ
タ時とかストロボ発光時等では、読出しモード切換え信
号ＳＧＭＤが“Ｌ”レベルに設定される。この場合には
各光電変換部における排出パルスＳＵＢ３４が送出され
てから、信号電荷蓄積を終了せしめる読出しパルスＳＧ
１，ＳＧ２の送出タイミングが３５，３６のように実質
的に同じタイミングに設定される。On the other hand, at the time of a high-speed shutter of 1/2000 seconds or more, or at the time of strobe light emission, the read mode switching signal SGMD is set to the "L" level. In this case, the read pulse SG for terminating signal charge accumulation after the discharge pulse SUB34 in each photoelectric conversion unit is transmitted.
1 and SG2 are set at substantially the same timing, such as 35 and 36.
【００１８】この場合、低速シャッタ動作ではあって
も、該シャッタ開時間中の後半でストロボ発光させるよ
うな撮影では、信号電荷蓄積時間の終端近傍期間での信
号電荷蓄積が、該信号電荷蓄積期間全体における信号電
荷蓄積に対して相対的に大きな比になるので、読出しパ
ルスのタイミングズレをなくした第１の態様の撮影によ
るのが好ましい。In this case, even in a low-speed shutter operation, in photographing in which strobe light is emitted in the latter half of the shutter opening time, signal charge accumulation in the period near the end of the signal charge accumulation time is caused by the signal charge accumulation period. Since the ratio becomes relatively large with respect to the total signal charge accumulation, it is preferable to use the first mode of imaging in which the timing deviation of the read pulse is eliminated.
【００１９】上記実施例によれば、撮像素子の信号電荷
蓄積期間の終期近傍期間での信号電荷蓄積の、信号電荷
蓄積期間全体での信号電荷蓄積に対して占める割合が無
視できるような、例えば1/60〜1/2000秒の通常撮影時に
は、信号電荷蓄積期間の終端近傍期間での読出しパルス
ＳＧ１，ＳＧ２の送出タイミングをずらすことにより、
第２の態様の撮影を行って読出し残りが生じない従来ど
おりの画質を得ることができる。一方、上記占しめる割
合が相対的に無視できない、例えば1/2000秒以上の高速
シャッタ時とかストロボ発光時には、上記送出タイミン
グを一致させて第１の態様の撮影を行うことにより、上
記読出し残りより画質劣化により大きく影響する露光量
の違いによる輝度ムラとか色ズレを防止できる。According to the above embodiment, the ratio of the signal charge accumulation in the period near the end of the signal charge accumulation period of the image pickup device to the signal charge accumulation in the entire signal charge accumulation period is negligible. At the time of the normal photographing of 1/60 to 1/2000 second, the transmission timing of the read pulses SG1 and SG2 in the period near the end of the signal charge accumulation period is shifted, so that
By performing the imaging in the second mode, it is possible to obtain the same image quality as that of the related art in which no unread portion occurs. On the other hand, when the occupying ratio cannot be relatively neglected, for example, at the time of a high-speed shutter or strobe light emission of 1/2000 second or more, the transmission timing is matched to perform the shooting in the first mode, so that the remaining readout is reduced. It is possible to prevent luminance unevenness and color shift due to a difference in exposure amount, which greatly affects image quality deterioration.
【００２０】なお、上記実施例では、カメラプロセス処
理部からの露出情報を用いて露光制御するとして説明し
たが、ＣＣＤからの露出情報を用いずに、測光センサ等
の外部測光素子を用いて露光制御するような系にも本発
明を適用できること勿論である。また、ＣＣＤの固体撮
像素子については、フレームインターライン型のＣＣＤ
で説明したが、フレームインターライントランスファタ
イプのＣＣＤや、フレームトランスファタイプのＣＣＤ
にも同様に適用可能なことは言うまでもない。更に、信
号電荷蓄積動作を開始する際に、それまで蓄積されてい
た無効電荷を１個の排出パルスで一斉に行うとして説明
したが、例えば転送路を用いて排出動作を行う方式にも
本発明を適用することができる。また、一般的なビデオ
ムービで説明したが、静止画情報を取扱う電子スチルカ
メラにも本発明を適用することができる。In the above embodiment, the exposure is controlled using the exposure information from the camera process processing unit. However, the exposure is controlled by using an external photometric element such as a photometric sensor without using the exposure information from the CCD. Of course, the present invention can be applied to a control system. As for the solid-state imaging device of CCD, a frame interline type CCD is used.
As described above, a frame interline transfer type CCD and a frame transfer type CCD
It is needless to say that the present invention can be similarly applied. Further, it has been described that when the signal charge accumulation operation is started, the invalid charges that have been accumulated up to that time are simultaneously performed by one ejection pulse. However, for example, the present invention is also applicable to a method of performing the ejection operation using a transfer path. Can be applied. Although the description has been made with reference to a general video movie, the present invention can be applied to an electronic still camera that handles still image information.
【００２１】[0021]
【発明の効果】以上述べたように本発明によれば、撮像
素子の信号電荷蓄積期間の終期近傍期間での信号電荷蓄
積が信号電荷蓄積期間全体での信号電荷蓄積に対して占
める割合が大きければ、撮像素子の全光電変換部の内の
一部および他部に対して実質的にタイミングずれがない
各別の読出しパルスを与えて信号電荷を読み出すし、上
記割合が小さければ、撮像素子の全光電変換部の内の一
部および他部に対して実質的にタイミングのずれた各別
の読み出しパルスを与えて信号電荷を読み出すようにし
たので、上記割合の如何に拘らず画質の劣化を低減でき
るという顕著な効果が発揮される。As described above, according to the present invention, the ratio of signal charge accumulation in the period near the end of the signal charge accumulation period of the image pickup device to the signal charge accumulation in the entire signal charge accumulation period is large. For example, a signal charge is read out by giving each read pulse having substantially no timing shift to a part and the other part of all the photoelectric conversion units of the image pickup device. Signal charges are read out by giving each read pulse with a substantially shifted timing to a part and the other part of all the photoelectric conversion units, so that the image quality is deteriorated regardless of the above ratio. The remarkable effect of being able to reduce is exhibited.
【図１】本発明の一実施例を示す撮像装置における露光
動作のタイミングチャート。FIG. 1 is a timing chart of an exposure operation in an imaging apparatus according to an embodiment of the present invention.
【図２】上記一実施例の要部ブロック構成図。FIG. 2 is a block diagram of a main part of the embodiment.
【図３】従来の撮像素子の模式図。FIG. 3 is a schematic diagram of a conventional image sensor.
【図４】従来の撮像装置の要部ブロック図。FIG. 4 is a block diagram of a main part of a conventional imaging device.
【図５】上記図４における露光動作のタイミングチャー
ト。FIG. 5 is a timing chart of the exposure operation in FIG. 4;
２…ＣＣＤ撮像素子（撮像素子） ４…ＣＣＤ駆動信号発生部（信号電荷読出し手段，信号
電荷読出し態様選択手段） ５…露出制御部（信号電荷読出し手段，信号電荷読出し
態様選択手段） １１ａ，１１ｂ，１１ｃ，１１ｄ，１１ｉ，１１ｊ，１
１ｋ，１１ｍ…光電変換部 ＳＧ１，ＳＧ２…読出しパルス2 ... CCD image pickup device (image pickup device) 4 ... CCD drive signal generation unit (signal charge readout unit, signal charge readout mode selection unit) 5 ... Exposure control unit (signal charge readout unit, signal charge readout mode selection unit) 11a, 11b , 11c, 11d, 11i, 11j, 1
1k, 11m: photoelectric conversion unit SG1, SG2: read pulse
Claims (1)
び他部に対して実質的にタイミングのずれがない各別の
読出しパルスを与えて信号電荷を読み出す第１の態様の
信号電荷読出し動作と、撮像素子の全光電変換部の内の
一部および他部に対して実質的にタイミングのずれた各
別の読出しパルスを与えて信号電荷を読み出す第２の態
様の信号電荷読出し動作と、を選択的に実行可能になさ
れた信号電荷読出し手段と、 当該撮影が、撮像素子の信号電荷蓄積期間の終期近傍期
間での信号電荷蓄積が信号電荷蓄積期間全体での信号電
荷蓄積に対して占める割合が比較的大きい第１の態様の
撮影かまたは第１の態様とは異なる第２の態様の撮影か
に応じて、上記第１の態様の撮影を行うときには上記信
号電荷読出し手段に上記第１の態様の信号電荷読出し動
作を行わしめ、上記第２の態様の撮影を行うときには上
記信号電荷読出し手段に上記第２の態様の信号電荷読出
し動作を行わしめる信号電荷読出し態様選択手段と、 を有してなることを特徴とする撮像装置。1. A signal charge according to a first mode, in which a signal charge is read by giving each other read pulse having substantially no timing shift to a part and another part of all photoelectric conversion units of an image sensor. A readout operation, and a signal charge readout operation according to a second mode in which signal charges are read out by giving individual readout pulses substantially deviated in timing to some and all of the photoelectric conversion units of the image sensor. And a signal charge readout means that can be selectively executed; and the imaging is such that the signal charge accumulation in the period near the end of the signal charge accumulation period of the image sensor is smaller than the signal charge accumulation in the entire signal charge accumulation period. Depending on whether the imaging of the first aspect or the imaging of the second aspect different from the first aspect is relatively large, the signal charge reading means performs the imaging of the first aspect. The signal power of the first aspect A signal charge readout mode selecting means for performing the readout operation and performing the signal charge readout operation of the second mode when performing the imaging in the second mode. Characteristic imaging device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4082343A JP2987457B2 (en) | 1992-04-03 | 1992-04-03 | Imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4082343A JP2987457B2 (en) | 1992-04-03 | 1992-04-03 | Imaging device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05284429A JPH05284429A (en) | 1993-10-29 |
| JP2987457B2 true JP2987457B2 (en) | 1999-12-06 |
Family
ID=13771925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4082343A Expired - Fee Related JP2987457B2 (en) | 1992-04-03 | 1992-04-03 | Imaging device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2987457B2 (en) |
-
1992
- 1992-04-03 JP JP4082343A patent/JP2987457B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05284429A (en) | 1993-10-29 |
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