JP3004994B2 - Electronic still camera - Google Patents
Electronic still cameraInfo
- Publication number
- JP3004994B2 JP3004994B2 JP63300393A JP30039388A JP3004994B2 JP 3004994 B2 JP3004994 B2 JP 3004994B2 JP 63300393 A JP63300393 A JP 63300393A JP 30039388 A JP30039388 A JP 30039388A JP 3004994 B2 JP3004994 B2 JP 3004994B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- recording
- timing
- timing pulse
- video signal
- 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 - Lifetime
Links
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- Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、電子スチルカメラで撮影後の記録動作に関
するものである。Description: TECHNICAL FIELD The present invention relates to a recording operation after photographing with an electronic still camera.
従来、この種の装置は第３図に示す様な回路構成であ
った。Conventionally, this type of device has a circuit configuration as shown in FIG.
第３図に於いて、被写体像はレンズ１を介して任意の
露光条件で、絞り２、メカニカルシャッター３を通して
固体撮像素子４の受光面に結像される。固体撮像素子４
からの出力は、信号処理回路５で決められたフォーマッ
トに基づいた映像信号に変換され、記録回路６でFM変調
され、記録部７の磁気ディスクに記録される。タイミン
グパルス発生回路８は固体撮像素子４の駆動パルス及び
信号処理に必要なタイミングパルスを発生する。動作制
御部９は、以上の撮影動作から記録完了までの各タイミ
ングをコントロールする。In FIG. 3, a subject image is formed on a light receiving surface of a solid-state imaging device 4 through a diaphragm 2 and a mechanical shutter 3 under an arbitrary exposure condition via a lens 1. Solid-state imaging device 4
Is converted into a video signal based on a format determined by the signal processing circuit 5, is FM-modulated by the recording circuit 6, and is recorded on the magnetic disk of the recording unit 7. The timing pulse generation circuit 8 generates a drive pulse for the solid-state imaging device 4 and a timing pulse necessary for signal processing. The operation control unit 9 controls each timing from the above photographing operation to the completion of recording.
この装置における撮影から記録までの動作をタイムチ
ャートで第２図に示す。レリーズ信号の立下りt21で撮
影動作が始まり、シャッター走行信号は、レリーズ直後
“Low"にセットされ、約100ms後、立上りt22でシャッタ
ー３の先幕走行スタート、立下りt23で後幕走行スター
トである。PG信号は、記録部７の磁気ディスクの記録開
始位置の信号で、記録部７にはレリーズ後電源が入るた
め、定常回路になるのに、多少時間がかかる。Vp信号は
垂直同期信号より約700μｓ遅れている信号で、後で説
明する固体撮像素子の電荷読出し開始信号より後に出る
パルスである。リセット信号は、立下りで垂直同期信号
の奇フィルド側から同期信号、及び各タイミングパルス
が始まる同期リセット信号である。odd,TG、evenTGは、
それぞれ固体撮像素子４の受光部から信号転送部への電
荷読出し信号で、odd.TGは奇フィールド、evenTGは偶フ
ィールドの電荷読出し信号である。CCD制御信号は、od
d.TG、evenTGの信号の発生をマスクする信号で“High"
でそれぞれのTGパルスは出なくなる。FIG. 2 is a time chart showing the operation from photographing to recording in this device. Photographing operation starts with falling t 21 of the release signal, the shutter driving signal is set immediately after release "Low", after about 100 ms, the front curtain traveling start of the shutter 3 at the rise t 22, the rear curtain falling t 23 It is a running start. The PG signal is a signal of the recording start position of the magnetic disk of the recording unit 7, and since the recording unit 7 is turned on after the release, it takes some time to become a steady circuit. The Vp signal is a signal delayed by about 700 μs from the vertical synchronizing signal, and is a pulse appearing later than the charge readout start signal of the solid-state imaging device described later. The reset signal is a synchronizing signal and a synchronizing reset signal at which each timing pulse starts from the odd-filled side of the vertical synchronizing signal at the falling edge. odd, TG, evenTG are
Each is a charge readout signal from the light receiving unit to the signal transfer unit of the solid-state imaging device 4, where odd.TG is an odd field and evenTG is an even field charge readout signal. CCD control signal is od
d. "High" signal that masks the generation of TG and evenTG signals
Then, each TG pulse does not come out.
記録期間は、固体撮像素子４の受光部から信号電荷を
順次読出し、記録部へ記録している期間である。The recording period is a period in which signal charges are sequentially read from the light receiving unit of the solid-state imaging device 4 and recorded in the recording unit.
以上のタイミングで、撮影から記録完了まで行われ
る。At the above timing, the process is performed from the photographing to the recording completion.
従来、シャッターの先幕走行スタートから記録完了ま
での動作において、PG信号の位相に垂直同期信号を移相
するリセット動作のタイミングを、シャッターの後幕走
行完了直後のPG信号に垂直同期信号を移相していた。こ
のタイミングでリセット動作すると、第２図に示すよう
なPG信号t24と後幕走行完了t25とのタイミングの場合、
t26のタイミングでリセット動作が行われ、１垂直同期
後（各パルス発生の安定のため）、記録部への固体撮像
素子からの電荷の読出し記録がt27〜t28間で行われる。Conventionally, in the operation from the start of the first curtain of the shutter to the completion of recording, the timing of the reset operation for shifting the vertical synchronization signal to the phase of the PG signal is shifted to the PG signal immediately after the completion of the second curtain of the shutter. It was compatible. When the reset operation at this timing, if the timing of the trailing curtain run completion t 25 and PG signal t 24 as shown in Figure 2,
reset operation is performed at the timing of t 26, after one vertical sync (for stabilization of the pulse generator), reading record of charge from the solid-state image pickup device to the recording portion is performed between t 27 ~t 28.
上記の如き従来の記録動作のタイミングでは、固体撮
像素子４の露光終了から信号読出し開始t27まで時間が
かかり、固体撮像素子４の暗電流ノイズが映像に影響
し、特に高感度撮影時には撮像素子からの信号をかなり
増幅させるため、この暗電流ノイズが目立ち、画質を劣
化させるという問題点があった。The timing of the above such conventional recording operation, it takes time from the end of exposure of the solid-state imaging device 4 to the signal read start t 27, the dark current noise of the solid-state imaging device 4 affects the image, the imaging device in particular when high-sensitivity shooting However, the dark current noise is conspicuous, and the image quality is degraded.
上記問題点の解決の為に、本発明では、被写体像を結
像する撮影光学系と、前記撮影光学系によって結像され
た被写体像に対する映像信号を出力する撮像手段と、前
記撮像手段に結像される前記被写体像を遮断するシャッ
ターと、前記撮像手段から前記映像信号を読み出すタイ
ミングを決めるタイミングパルスを発生するタイミング
パルス発生手段と、記録開始位置信号で前記映像信号の
記録を開始する記録手段と、前記シャッターによる被写
体像の遮断を開始する信号に応答して前記タイミングパ
ルスの発生タイミングを、前記記録手段の記録開始位置
信号の位相に移相するように前記タイミングパルス発生
手段を制御する制御手段とを有することとした。In order to solve the above problems, the present invention provides an imaging optical system that forms an image of a subject, an imaging unit that outputs a video signal corresponding to the image of the subject formed by the imaging optical system, and an imaging unit that forms an image. A shutter for blocking the image of the subject to be imaged, a timing pulse generating means for generating a timing pulse for determining a timing for reading the video signal from the imaging means, and a recording means for starting recording of the video signal with a recording start position signal And controlling the timing pulse generating means so as to shift the generation timing of the timing pulse to the phase of a recording start position signal of the recording means in response to a signal for starting blocking of the subject image by the shutter. Means.
［実施例］ 第１図は、本発明の実施例のタイムチャートである。
尚、本装置、タイムチャート信号の説明は、従来の技術
と同じであるので、省略する。Embodiment FIG. 1 is a time chart of an embodiment of the present invention.
The description of the present apparatus and the time chart signal is the same as that of the prior art, and thus will be omitted.
第１図中のタイムチャートに於いて、PG信号の位相に
垂直同期信号を移相するリセット動作のタイミングをシ
ャッターの後幕走行スタート直後のPG信号で行なう為、
リセット動作のタイミングはt14で行われ、t16〜t17の
期間で固体撮像素子からの電荷読出し記録が行われる。In the time chart of FIG. 1, the timing of the reset operation for shifting the vertical synchronizing signal to the phase of the PG signal is performed by the PG signal immediately after the start of the rear curtain of the shutter.
Timing of the reset operation is performed at t 14, the charge reading records from the solid-state imaging device is performed in a period of t 16 ~t 17.
以上の様に本発明よれば、従来の装置よりも撮像手段
の露光終了から映像信号記録までの時間を短縮すること
ができる。これにより、短縮期間分の暗電流ノイズが低
減され、特に高感度撮影の場合、暗電流ノイズによる画
質劣下を防ぐ効果がある。As described above, according to the present invention, the time from the end of exposure of the imaging means to the recording of the video signal can be reduced as compared with the conventional apparatus. As a result, dark current noise for the shortened period is reduced, and particularly in the case of high-sensitivity shooting, there is an effect of preventing image quality deterioration due to dark current noise.
また、撮像手段の露光終了から映像信号記録までの時
間を短縮することができるので、連写モードでの２枚目
の撮影までの時間が短くなり、連写サイクルも短縮され
る効果がある。Further, since the time from the end of the exposure of the image pickup means to the recording of the video signal can be shortened, the time until the second image is shot in the continuous shooting mode is shortened, and the continuous shooting cycle is also shortened.
第１図は、本発明の実施例のタイムチャートである。 第２図は、従来例のタイムチャートである。 第３図は、電子スチルカメラのブロック図である。 〔主要部分の符号の説明〕 １……レンズ ２……絞り ３……メカニカルシャッター ４……固体撮像素子 ５……信号処理回路 ６……記録回路 ７……記録部 ８……タイミングパルス発生回路 FIG. 1 is a time chart of the embodiment of the present invention. FIG. 2 is a time chart of a conventional example. FIG. 3 is a block diagram of the electronic still camera. [Description of Signs of Main Parts] 1 ... Lens 2 ... Aperture 3 ... Mechanical shutter 4 ... Solid-state imaging device 5 ... Signal processing circuit 6 ... Recording circuit 7 ... Recording unit 8 ... Timing pulse generation circuit
Claims (1)
映像信号を出力する撮像手段と、 前記撮像手段に結像される前記被写体像を遮断するシャ
ッターと、 前記撮像手段から前記映像信号を読み出すタイミングを
決めるタイミングパルスを発生するタイミングパルス発
生手段と、 記録開始位置信号で前記映像信号の記録を開始する記録
手段と、 前記シャッターによる被写体像の遮断を開始する信号に
応答して前記タイミングパルスの発生タイミングを、前
記記録手段の記録開始位置信号の位相に移相するように
前記タイミングパルス発生手段を制御する制御手段とを
有することを特徴とする電子スチルカメラ。A photographing optical system for forming a subject image; an imaging unit for outputting a video signal corresponding to the subject image formed by the photographing optical system; and the subject image formed on the imaging unit. A shutter for shutting off the image signal; a timing pulse generating means for generating a timing pulse for determining a timing for reading the video signal from the imaging means; a recording means for starting recording of the video signal with a recording start position signal; Control means for controlling the timing pulse generation means so as to shift the generation timing of the timing pulse in response to a signal for starting image interruption to a phase of a recording start position signal of the recording means. An electronic still camera.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63300393A JP3004994B2 (en) | 1988-11-28 | 1988-11-28 | Electronic still camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63300393A JP3004994B2 (en) | 1988-11-28 | 1988-11-28 | Electronic still camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02146880A JPH02146880A (en) | 1990-06-06 |
| JP3004994B2 true JP3004994B2 (en) | 2000-01-31 |
Family
ID=17884248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63300393A Expired - Lifetime JP3004994B2 (en) | 1988-11-28 | 1988-11-28 | Electronic still camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3004994B2 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60103874A (en) * | 1983-11-11 | 1985-06-08 | Canon Inc | Image pickup device |
| JPS61281780A (en) * | 1985-06-07 | 1986-12-12 | Fuji Photo Film Co Ltd | Electronic still camera |
| JPS62185475A (en) * | 1986-02-12 | 1987-08-13 | Fuji Photo Film Co Ltd | Electronic still camera |
-
1988
- 1988-11-28 JP JP63300393A patent/JP3004994B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02146880A (en) | 1990-06-06 |
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