JPH05316416A - Lens diaphragm control system - Google Patents
Lens diaphragm control systemInfo
- Publication number
- JPH05316416A JPH05316416A JP4146373A JP14637392A JPH05316416A JP H05316416 A JPH05316416 A JP H05316416A JP 4146373 A JP4146373 A JP 4146373A JP 14637392 A JP14637392 A JP 14637392A JP H05316416 A JPH05316416 A JP H05316416A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- deviation signal
- aperture
- diaphragm
- lens
- 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
Landscapes
- Diaphragms For Cameras (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はTVカメラにおけるレン
ズの自動絞り制御方式に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic aperture control system for lenses in TV cameras.
【0002】[0002]
【従来の技術】図2は従来の自動レンズ絞り制御方式を
示す図である。同図において、1は絞り調整用モータ、
2はポテンションメータ、3はレンズ、4は絞り、5は
撮像素子、6,7は映像信号増幅部、8は映像信号出
力、9は検波部、10は基準電圧、11は差動比較部、
12は偏位信号加算部、13は絞り制御信号入力、14
は絞り位置信号出力である。次に上記構成の自動レンズ
絞り制御方式の動作を説明する。検波部9により映像信
号のピークレベルを検波し、差動比較部11により基準
電圧10と比較し、偏位信号を比較結果として出力す
る。そして、偏位信号加算部12により、絞り位置信号
出力14と偏位信号を加算し、絞り制御信号出力13と
して絞り調整用モータ1に供給し、絞り4の開閉を行
う。これによって、映像信号のレベルが変化し、検波部
9の検波信号と基準電圧10が等しくなるように絞り4
が制御される。以上の動作を繰り返し、自動レンズ絞り
制御を行う。2. Description of the Related Art FIG. 2 is a diagram showing a conventional automatic lens aperture control system. In the figure, 1 is a diaphragm adjusting motor,
2 is a potentiometer, 3 is a lens, 4 is a diaphragm, 5 is an image sensor, 6 and 7 are video signal amplifiers, 8 is a video signal output, 9 is a detector, 10 is a reference voltage, 11 is a differential comparator. ,
Reference numeral 12 denotes a displacement signal adding unit, 13 denotes an aperture control signal input, and 14
Is an aperture position signal output. Next, the operation of the automatic lens diaphragm control system having the above configuration will be described. The detection unit 9 detects the peak level of the video signal, the differential comparison unit 11 compares it with the reference voltage 10, and outputs the displacement signal as a comparison result. Then, the displacement signal adder 12 adds the aperture position signal output 14 and the displacement signal, and supplies them as the aperture control signal output 13 to the aperture adjusting motor 1 to open and close the aperture 4. As a result, the level of the video signal changes, and the diaphragm 4 is adjusted so that the detection signal of the detection unit 9 and the reference voltage 10 become equal.
Is controlled. The above operation is repeated to perform automatic lens aperture control.
【0003】[0003]
【発明が解決しようとする課題】従来の方式では、レン
ズ絞りの動作速度が開方向と閉方向で機械的に異なる場
合には一定の絞り位置に安定するまでに細かく開閉を繰
り返したり、安定したときの誤差が大きくなる欠点があ
る。本発明はこれらの欠点を除去し、精度が高く安定し
た動作が可能な自動絞り制御機能を持ったTVカメラの
実現を目的とする。In the conventional method, when the operating speed of the lens diaphragm is mechanically different between the opening direction and the closing direction, fine opening and closing are repeated or stabilized until the diaphragm position stabilizes. There is a drawback that the time error becomes large. It is an object of the present invention to eliminate these drawbacks and to realize a TV camera having an automatic aperture control function capable of highly accurate and stable operation.
【0004】[0004]
【課題を解決するための手段】本発明は上記の目的を達
成するため、映像信号レベルを基準電圧と比較し、該比
較結果を偏位信号として絞り位置信号出力と加算し、絞
り制御信号出力として絞り調整用モータに供給し、映像
信号レベルが基準電圧に一致するようレンズ絞りを制御
するレンズ絞り制御方式において、正極性の偏位信号と
負極性の偏位信号とで偏位信号の加算係数を変えて制御
する構成としたものである。In order to achieve the above object, the present invention compares a video signal level with a reference voltage, adds the comparison result as a displacement signal to an aperture position signal output, and outputs an aperture control signal. In the lens diaphragm control system that controls the lens diaphragm so that the video signal level matches the reference voltage, the deviation signal is added as a positive deviation signal and a negative deviation signal. It is configured to control by changing the coefficient.
【0005】[0005]
【作用】その結果、レンズ絞りの動作速度が開方向と閉
方向で同じになるため、最適なレンズ絞り位置に安定す
るまでに開閉を繰り返すことがなくなり、精度のよいレ
ンズ絞り制御を行うことが出来る。As a result, since the operating speed of the lens diaphragm is the same in the opening direction and the closing direction, the opening and closing is not repeated until the lens diaphragm position is stabilized at the optimum position, and the lens diaphragm can be controlled accurately. I can.
【0006】[0006]
【実施例】図1は本発明によるレンズ絞り制御方式の構
成を示すブロック図である。図1において、1は絞り制
御用モータ、2はポテンションメータ、3はレンズ、4
は絞り、5は撮像素子、6,7は映像増幅部、8は映像
信号出力、9は検波部、10は基準電圧、11は映像信
号のピークレベルと基準電圧10を比較し、偏位信号を
比較結果として出力する差動比較部、12は偏位信号加
算部、13は絞り制御信号入力、14は絞り位置信号出
力、15は偏位信号の極性の正、負を判別し、それぞれ
対応して設定された関数に基づく処理を行い、偏位信号
の入出力特性をその極性に応じて変換する偏位信号処理
部である。1 is a block diagram showing the configuration of a lens diaphragm control system according to the present invention. In FIG. 1, 1 is a diaphragm control motor, 2 is a potentiometer, 3 is a lens, and 4 is a lens.
Is an aperture, 5 is an image sensor, 6, 7 is a video amplifier, 8 is a video signal output, 9 is a detector, 10 is a reference voltage, 11 is a peak level of the video signal, and the reference voltage 10 is compared to obtain a deviation signal. Is output as a comparison result, 12 is an excursion signal adder, 13 is an aperture control signal input, 14 is an aperture position signal output, and 15 is a positive or negative polarity of the excursion signal. Is a deviation signal processing unit that performs processing based on the set function and converts the input / output characteristics of the deviation signal according to its polarity.
【0007】次に上記構成による自動絞り制御方式の動
作について説明する。検波部9により映像信号のピーク
レベルを検波し、差動比較部11により基準電圧10と
比較し、偏位信号を比較結果として出力する。ここで、
偏位信号処理部15において差動比較部11より出力さ
れた偏位信号の極性の正、負を判別し、それぞれ対応し
て設定された関数に基づく処理を行い、当該偏位信号の
入出力特性をその極性に応じて変換する。そして、偏位
信号加算部12により、当該偏位信号と絞り位置信号出
力14よりの信号とを加算し、絞り制御信号入力13と
して出力することにより、絞り制御用モータ1に供給
し、偏位信号の極性に応じた、すなわち絞り4の動作速
度が開方向と閉方向で同じになるように開閉を行う。こ
れによって、映像信号のレベルが変化し、検波部9の検
波信号と基準電圧10が等しくなるように絞り4が制御
される。以上の動作を繰り返し、自動レンズ絞り制御を
行う。Next, the operation of the automatic diaphragm control system having the above configuration will be described. The detector 9 detects the peak level of the video signal, the differential comparator 11 compares it with the reference voltage 10, and outputs the displacement signal as a comparison result. here,
The displacement signal processing unit 15 determines whether the polarity of the displacement signal output from the differential comparison unit 11 is positive or negative, performs processing based on the function set corresponding to each, and inputs / outputs the displacement signal. Converts the property according to its polarity. Then, the deviation signal adding unit 12 adds the deviation signal and the signal from the diaphragm position signal output 14 and outputs the result as the diaphragm control signal input 13, thereby supplying the diaphragm control motor 1 with the deviation signal. The opening / closing is performed according to the polarity of the signal, that is, the operation speed of the diaphragm 4 is the same in the opening direction and the closing direction. As a result, the level of the video signal changes, and the diaphragm 4 is controlled so that the detection signal of the detection unit 9 and the reference voltage 10 become equal. The above operation is repeated to perform automatic lens aperture control.
【0008】[0008]
【発明の効果】本発明によれば、レンズ絞りの動作速度
が開方向と閉方向で同じになるため、精度が高く安定し
た動作が可能な自動絞り制御機能を持ったTVカメラが
実現できる。According to the present invention, since the operating speed of the lens diaphragm is the same in the opening direction and the closing direction, it is possible to realize a TV camera having an automatic diaphragm control function capable of highly accurate and stable operation.
【図1】従来の自動絞り制御方式を示すブロック図。FIG. 1 is a block diagram showing a conventional automatic aperture control method.
【図2】本発明の一実施例を示すブロック図。FIG. 2 is a block diagram showing an embodiment of the present invention.
9:検波部、10:基準電圧、11:差動比較部、1
2:偏位信号加算部、13:絞り制御信号入力、14:
絞り位置信号出力、15:偏位信号処理部。9: Detection unit, 10: Reference voltage, 11: Differential comparison unit, 1
2: deviation signal adder, 13: aperture control signal input, 14:
Aperture position signal output, 15: deviation signal processing unit.
Claims (1)
比較結果を偏位信号として絞り位置信号出力と加算し、
絞り制御信号出力として絞り調整用モータに供給し、映
像信号レベルが基準電圧に一致するようレンズ絞りを制
御するレンズ絞り制御方式において、正極性の偏位信号
と負極性の偏位信号とで偏位信号の加算係数を変えて制
御するレンズ絞り制御方式。1. A video signal level is compared with a reference voltage, and the comparison result is added as an excursion signal to an aperture position signal output,
In the lens diaphragm control system, which supplies the diaphragm control signal as an output to the diaphragm adjusting motor and controls the lens diaphragm so that the video signal level matches the reference voltage, the positive bias signal and the negative bias signal are used to shift the bias. A lens aperture control method that controls by changing the addition coefficient of the position signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4146373A JPH05316416A (en) | 1992-05-13 | 1992-05-13 | Lens diaphragm control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4146373A JPH05316416A (en) | 1992-05-13 | 1992-05-13 | Lens diaphragm control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05316416A true JPH05316416A (en) | 1993-11-26 |
Family
ID=15406254
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4146373A Pending JPH05316416A (en) | 1992-05-13 | 1992-05-13 | Lens diaphragm control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05316416A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006319587A (en) * | 2005-05-12 | 2006-11-24 | Hitachi Kokusai Electric Inc | Television camera |
JP2014017713A (en) * | 2012-07-10 | 2014-01-30 | Canon Inc | Lens unit and imaging apparatus |
-
1992
- 1992-05-13 JP JP4146373A patent/JPH05316416A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006319587A (en) * | 2005-05-12 | 2006-11-24 | Hitachi Kokusai Electric Inc | Television camera |
JP4746913B2 (en) * | 2005-05-12 | 2011-08-10 | 株式会社日立国際電気 | Television camera |
JP2014017713A (en) * | 2012-07-10 | 2014-01-30 | Canon Inc | Lens unit and imaging apparatus |
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