JPS5833368A - Electronic camera - Google Patents
Electronic cameraInfo
- Publication number
- JPS5833368A JPS5833368A JP56131913A JP13191381A JPS5833368A JP S5833368 A JPS5833368 A JP S5833368A JP 56131913 A JP56131913 A JP 56131913A JP 13191381 A JP13191381 A JP 13191381A JP S5833368 A JPS5833368 A JP S5833368A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- shutter
- level
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 239000000919 ceramic Substances 0.000 abstract description 6
- 230000005684 electric field Effects 0.000 abstract description 4
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/75—Circuitry for compensating brightness variation in the scene by influencing optical camera components
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は例えば固体撮像素子(例えばCCD)を使用し
、光学系を介して得た像より電気的映像信号を得、この
映像信号を例えば回転磁気シートレコーダにより回転磁
気シートに記録する様にした電子カメラに関し、特に光
学系の露光時間を常に最適値にすることができる様にし
たものである。DETAILED DESCRIPTION OF THE INVENTION The present invention uses, for example, a solid-state image sensor (such as a CCD), obtains an electrical video signal from an image obtained through an optical system, and converts this video signal into a rotating magnetic sheet recorder using, for example, a rotating magnetic sheet recorder. This invention relates to an electronic camera that records on a sheet, and in particular allows the exposure time of the optical system to always be set to the optimum value.
以下図面を参照しながら本発明電子カメラの一実施例に
つき説明しよう。An embodiment of the electronic camera of the present invention will be described below with reference to the drawings.
第1図は電子カメラの外観を示し、この第1図に於いて
、(1)は固体撮像素子を使用し光学的偉より電気的映
像信号を得る映像信号形成回路及びこの映像信号を記録
する回転磁気シートレコーダ等が設けられている電子カ
メラ本体、(2)は光学系を構成する交換レンズ装置、
(3)は電源を構成する電池パックである。Figure 1 shows the appearance of an electronic camera. In Figure 1, (1) is a video signal forming circuit that uses a solid-state image sensor to obtain an electrical video signal from an optical device, and a circuit that records this video signal. An electronic camera body equipped with a rotating magnetic sheet recorder, etc.; (2) an interchangeable lens device constituting the optical system;
(3) is a battery pack that constitutes a power source.
本例につき第2図を参照して説明するに本例に於いては
光学系(2)の所定位置例えば絞りに隣接して電子シャ
ッタ(4)を設ける。この電子シャッタ(4)としては
第3図に示す如くクロスニフルにおいた2枚の偏向板(
4m)及び(4b)の間に電極(5m)及び(5b)に
より挾んだ強誘電体セラ電ツク(5)を設けたもので、
この強誘電体セラiック(5)に電界を加えたとき光が
透過し、この電界を切るとき光が透過しない様になされ
たものである。This example will be explained with reference to FIG. 2. In this example, an electronic shutter (4) is provided at a predetermined position of the optical system (2), for example, adjacent to the aperture. This electronic shutter (4) consists of two deflection plates (
A ferroelectric ceramic electric cap (5) sandwiched between electrodes (5 m) and (5b) is provided between (4 m) and (4 b),
When an electric field is applied to this ferroelectric ceramic IC (5), light passes through it, and when this electric field is turned off, no light passes through it.
この光学系(2)を介して得られる光学的儂を固体撮像
素子例えばCOD (6)に供給する。この固体撮像素
子(6)は同期信号及びコントロール信号発生回路(7
)よりのコントロール信号により駆動され、その出力側
には光学像に応じた電気的映像信号が得られる。この固
体撮像素子(6)の出力側に得られる映像信号を信号プ
ロセス回路(8)に供給すると共に同期信号及びコント
ロール信号発生回路(7)よりの同期信号をこの信号プ
ロセス回路(8)に供給し、この信号プロセス回路(8
)に於いて映像信号に同期信号を付加して完全な映像信
号とする。この信号プ四セス回路(8)の出力端子(8
a)に得られる映像信号を回転磁気シートレコーダに供
給してこれを記録する如くする。The optical image obtained through this optical system (2) is supplied to a solid-state image sensor, for example, a COD (6). This solid-state image sensor (6) is connected to a synchronization signal and control signal generation circuit (7).
), and an electrical video signal corresponding to the optical image is obtained on the output side. The video signal obtained on the output side of this solid-state image sensor (6) is supplied to the signal processing circuit (8), and the synchronization signal from the synchronization signal and control signal generation circuit (7) is supplied to this signal processing circuit (8). This signal processing circuit (8
), a synchronization signal is added to the video signal to make a complete video signal. The output terminal (8) of this signal processing circuit (8)
The video signal obtained in step a) is supplied to a rotating magnetic sheet recorder to record it.
又本例に於いては固体撮像素子(6)の出力側に得られ
る映像信号をクランプ回路(9)に供給する。このクラ
ンプ回路(9)に於いては輝度信号の水平同期信号位置
を所定レベルにクランプする如くする。Further, in this example, the video signal obtained on the output side of the solid-state image sensor (6) is supplied to the clamp circuit (9). In this clamp circuit (9), the horizontal synchronizing signal position of the luminance signal is clamped to a predetermined level.
このクランプ回路(9)の出力側に得られる輝度信号を
レベル検出回路を構成するローノ(スフィルタ0αに供
給し、この四−パスフィルタα〔の出力側に輝度信号の
平均レベル信号(10a)を得、この平均レベル信号(
10m)をパルス幅変調回路を構成する比較回路ODの
一方の入力端子に供給する。又同期信号及びコントロー
ル信号発生回路(7)より第4図人に示す如き垂直同期
信号をランプ信号発生回路fi3に供給し、このランプ
信号発生回路(Izに於いて、第4図Bに示す如く垂直
同期信号に同期し時間の経過と共に徐々に減衰するラン
プ信号(12りを得、このランプ信号(12りを比較回
路al)の他方の入力端子に供給する。この比較回路0
1於いては他方の入力端子に供給されるランプ信号(1
2りのレベルが一方の入力端子に供給される輝度信号の
平均レベル信号(ton)より高いときはハイレベル信
号゛1″となり、これが低いときはローレベル信号60
”となる如くなす。従ってこの場合輝度信号の平均レベ
ル信号(10a)のレベルが高いときは比較回路α1)
の出力側に得られる信号パルス幅が小さくなり、この平
均レベル信号(10a)のレベルが低いときは比較回路
αυの出力側に得られる信号のパルス幅が大きくなる。The luminance signal obtained at the output side of this clamp circuit (9) is supplied to the ronos filter 0α constituting the level detection circuit, and the average level signal (10a) of the luminance signal is supplied to the output side of this four-pass filter α. and this average level signal (
10m) is supplied to one input terminal of a comparison circuit OD constituting a pulse width modulation circuit. Further, the synchronization signal and control signal generation circuit (7) supplies a vertical synchronization signal as shown in FIG. 4 to the ramp signal generation circuit fi3, and in this ramp signal generation circuit (Iz), A ramp signal (12) which is synchronized with the vertical synchronization signal and gradually attenuates with the passage of time is obtained, and this ramp signal (12) is supplied to the other input terminal of the comparator circuit al.
In 1, the ramp signal (1
When the two levels are higher than the average level signal (ton) of the luminance signal supplied to one input terminal, it becomes a high level signal "1", and when this is lower, it becomes a low level signal 60.
”. Therefore, in this case, when the level of the average level signal (10a) of the luminance signal is high, the comparator circuit α1)
When the average level signal (10a) has a low level, the pulse width of the signal obtained at the output side of the comparison circuit αυ becomes large.
即ち比較回路αυの出力側には輝度信号の平均レベル信
号(IQa)に反比例したパルス幅のパルス幅変調信号
が得られる。この比較回路aυの出力側に得られるパル
ス幅変調信号を駆動回路a3を介して電子シャッタ(4
)に供給し、この電子シャッタ(4)の露光時間をこの
パルス幅変t1信号により制御する如くする。That is, a pulse width modulated signal having a pulse width inversely proportional to the average level signal (IQa) of the luminance signal is obtained on the output side of the comparator circuit αυ. The pulse width modulation signal obtained on the output side of the comparison circuit aυ is sent to the electronic shutter (4) via the drive circuit a3.
), and the exposure time of this electronic shutter (4) is controlled by this pulse width variation t1 signal.
本例は上述の如く構成されているので例えばローパスフ
ィルタαυの出力側に第4゛図Bk1lli(10りで
示す如き輝度信号の平均レベル信゛号が得られたときは
比較回路0υの出力側に第4図Cに示す如きパルス幅変
調信号が得られ、これにより電子シャッタ(4)の露光
時間が決定される。Since this example is configured as described above, for example, when the average level signal of the luminance signal as shown in FIG. A pulse width modulation signal as shown in FIG. 4C is obtained, and the exposure time of the electronic shutter (4) is determined by this signal.
従って本発明に於いては電子シャッタ(4)の露光時間
を撮像素子(6)の出力の映像信号のレベルが常に一定
になる様に決定され、常に最良の露光時間を得ることが
できる。又従来のテレビカメラはアイリスで露光調整を
行う為にモーター等を使用し【おり、応答時間が比較的
遅く、小形化に向かないし、又従来のカメラのシャッタ
も高速応答がむずかしいが、本発明に依ればこの露光時
間を電気的に決定するので応答時間が極めて早く且つ小
形化に適している利益がある。Therefore, in the present invention, the exposure time of the electronic shutter (4) is determined so that the level of the video signal output from the image sensor (6) is always constant, and the best exposure time can always be obtained. Also, conventional TV cameras use motors etc. to adjust exposure with the iris, and the response time is relatively slow, making them unsuitable for miniaturization.Also, it is difficult for conventional camera shutters to respond quickly, but this According to the invention, since the exposure time is determined electrically, the response time is extremely fast and the device is suitable for miniaturization.
又上述比較回路aυの出力側のパルス幅変調信号のパル
ス幅を計測することにより露光時間をファインダーに表
示することが可能である。更に又上述例に於いて駆動回
路(13に供給するパルス幅変調信号をシスコンで制御
することKより多重露光やストロボ使用時に電子シャッ
タを開放にすることも可能である。Furthermore, by measuring the pulse width of the pulse width modulation signal on the output side of the comparison circuit aυ, the exposure time can be displayed on the finder. Furthermore, in the above example, by controlling the pulse width modulation signal supplied to the drive circuit (13) by the system controller, it is possible to open the electronic shutter during multiple exposure or when using a strobe.
尚本発明は上述実施例に限らず本発明の要旨を逸脱する
ことなくその他種々の構成を取り得ることは勿論である
。It goes without saying that the present invention is not limited to the above-described embodiments, and can take various other configurations without departing from the gist of the present invention.
第1図及び第4図は夫々本発明の説明に供する線図、第
2図は本発明電子カメラの一実施例を示す構成図、第3
図は電子シャッタの例を示す構成図であるb
(2)は光学系、(4)は電子シャッタ、(6)は撮像
素子、aωはレベル検出回路、0υは比較回路、(Iz
はランプ信号発生回路である。
第1図
第2図
第3図
第4図1 and 4 are diagrams for explaining the present invention, FIG. 2 is a configuration diagram showing an embodiment of the electronic camera of the present invention, and FIG.
The figure is a configuration diagram showing an example of an electronic shutter. b (2) is an optical system, (4) is an electronic shutter, (6) is an image sensor, aω is a level detection circuit, 0υ is a comparison circuit, (Iz
is a ramp signal generation circuit. Figure 1 Figure 2 Figure 3 Figure 4
Claims (1)
にした電子カメラに於いて、上記光学系に電子シャッタ
を設け、上記映像信号のレベルにより上記電子シャッタ
の露光時間を決定する様にしたことを特徴とする電子カ
メラ。In an electronic camera that converts an image obtained through an optical system into an electrical video signal, an electronic shutter is provided in the optical system, and the exposure time of the electronic shutter is determined depending on the level of the video signal. An electronic camera characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56131913A JPS5833368A (en) | 1981-08-21 | 1981-08-21 | Electronic camera |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56131913A JPS5833368A (en) | 1981-08-21 | 1981-08-21 | Electronic camera |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5833368A true JPS5833368A (en) | 1983-02-26 |
Family
ID=15069107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56131913A Pending JPS5833368A (en) | 1981-08-21 | 1981-08-21 | Electronic camera |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5833368A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6623036B2 (en) | 2001-01-11 | 2003-09-23 | Fuji Kiko Co., Ltd. | Steering column assembly for a vehicle |
-
1981
- 1981-08-21 JP JP56131913A patent/JPS5833368A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6623036B2 (en) | 2001-01-11 | 2003-09-23 | Fuji Kiko Co., Ltd. | Steering column assembly for a vehicle |
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