JPS5926697Y2 - Servo amplifier circuit for TV lens - Google Patents
Servo amplifier circuit for TV lensInfo
- Publication number
- JPS5926697Y2 JPS5926697Y2 JP1977094930U JP9493077U JPS5926697Y2 JP S5926697 Y2 JPS5926697 Y2 JP S5926697Y2 JP 1977094930 U JP1977094930 U JP 1977094930U JP 9493077 U JP9493077 U JP 9493077U JP S5926697 Y2 JPS5926697 Y2 JP S5926697Y2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- amplifier circuit
- servo amplifier
- power supply
- television 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/002—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general without controlling loop
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
- H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
- H02P7/288—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using variable impedance
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Lens Barrels (AREA)
- Television Receiver Circuits (AREA)
- Studio Devices (AREA)
- Control Of Electric Motors In General (AREA)
- Automatic Focus Adjustment (AREA)
Description
【考案の詳細な説明】
本考案はテレビレンズ用サーボ増幅回路に関し、特にサ
ーボモータの作動時に生ずる異常電流によりサーボ制御
回路及びテレビカメラのビデオ回路や制御回路に悪影響
を与えることを防止したテレビレンズ用サーボ増幅回路
に関する。[Detailed description of the invention] The present invention relates to a servo amplifier circuit for a television lens, and in particular to a television lens that prevents abnormal current generated when a servo motor is operating from adversely affecting the servo control circuit and the video circuit and control circuit of a television camera. servo amplifier circuit.
従来のテレビカメラは、設備の整ったスタジオあるいは
電源車の用意されている屋外での使用が主であり、従っ
てテレビレンズのオートアイリス機構やズーム機構ある
いはフォーカス機構等に接続されたサーボモータを駆動
制御するテレビレンズ用サーボ増幅回路には十分な容量
の電源を用いることが出来、サーボモータの起動時及び
方向転換時などに発生するラッシュカレントでは電源電
圧の低下を招くことはなかった。Conventional television cameras are mainly used in well-equipped studios or outdoors where a power supply vehicle is available, and therefore the servo motor connected to the auto iris mechanism, zoom mechanism, focus mechanism, etc. of the television lens is driven and controlled. A power supply with sufficient capacity can be used for the servo amplifier circuit for the television lens, and the rush current generated when the servo motor starts up or changes direction does not cause a drop in the power supply voltage.
しかし、最近の小型ハンディカメラでは、供給電源とし
て小容量のバッテリーを使用しているため、特にレンズ
用サーボ増幅器路とカメラ側回路との電源を共用してい
る形式のものでは、以下のような欠点があった。However, recent small handy cameras use small-capacity batteries as power supply, so especially those that share the power supply between the lens servo amplifier circuit and the camera side circuit, the following problems occur. There were drawbacks.
すなわち、レンズ用サーボ増幅回路により駆動されるサ
ーボモータの起動時及び方向転換時などにスパイク状に
立ち上がる異常電流（ラッシュカレント）が生じ、この
電流値が定常電流値の５〜６倍に達することもあり、こ
の大電流によりバッテリーの電源電圧または定電圧電源
の端子電圧が大きく低下してカメラ側のビデオ回路や制
御回路などに悪影響を与える原因となっていた。In other words, when the servo motor driven by the lens servo amplifier circuit starts up or changes direction, an abnormal current (rush current) that rises in a spike shape occurs, and this current value reaches 5 to 6 times the steady current value. This large current caused a significant drop in the battery power supply voltage or the terminal voltage of the constant voltage power supply, which adversely affected the camera's video circuit and control circuit.
本考案は上記欠点を除去したものであり、サーボモータ
を制御・駆動するレンズ用サーボ増幅回路の電源や定電
圧電源からの電流供給を電流制限回路により制限し、電
源や定電圧電源の供給電圧の低下を他のビテ゛オ回路や
制御回路に悪影響を与えない範囲内に押えたものである
。The present invention eliminates the above drawbacks, and uses a current limiting circuit to limit the current supply from the power source and constant voltage power source of the lens servo amplifier circuit that controls and drives the servo motor, thereby reducing the supply voltage of the power source and constant voltage power source. This suppresses the decrease in the voltage within a range that does not adversely affect other video circuits or control circuits.
以下、本考案のテレビレンズ用サーボ増幅回路を図面に
示した実施例により詳述する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The servo amplifier circuit for a television lens according to the present invention will be described in detail below with reference to embodiments shown in the drawings.
第１図において、定電圧電源２にはカメラ制御回路３、
例えばビデオ信号回路等が接続されている。In FIG. 1, the constant voltage power supply 2 includes a camera control circuit 3,
For example, a video signal circuit or the like is connected.
さらにこの定電圧電源２の正端子４と負端子５には前置
増幅回路７の電源端子が接続されている。Furthermore, a power supply terminal of a preamplifier circuit 7 is connected to the positive terminal 4 and the negative terminal 5 of the constant voltage power supply 2.
また電力増幅回路９の電源端子はそれぞれ電流制限回路
１０．１０’を介して定電圧電源２の正端子４と負端子
５に接続されている。Further, the power supply terminals of the power amplifier circuit 9 are connected to the positive terminal 4 and the negative terminal 5 of the constant voltage power supply 2 via current limiting circuits 10 and 10', respectively.
前置増幅回路７の入力端の一方は定電圧電源２の接地端
子６に接続され、他方は制御信号入力端子８に接続され
ている。One of the input terminals of the preamplifier circuit 7 is connected to the ground terminal 6 of the constant voltage power supply 2, and the other is connected to the control signal input terminal 8.
この制御端子入力信号８には図示せぬが、例えばテレビ
カメラのオートアイリス機構やズーム機構やフォーカス
機構等のための制御信号が加えられる。Although not shown, control signals for, for example, an auto iris mechanism, a zoom mechanism, a focus mechanism, etc. of a television camera are added to this control terminal input signal 8.
前置増幅回路７では被制御体（ズーム、フォーカス、ア
イリス等）からのフィードバック信号や規準電圧などと
この制御信号との比較が行なわれ、この前置増幅回路７
の出力はそのまま電力増幅回路９の入力に接続される。In the preamplifier circuit 7, a feedback signal from a controlled object (zoom, focus, iris, etc.) and a reference voltage are compared with this control signal.
The output is directly connected to the input of the power amplifier circuit 9.
さらに、この前置増幅回路９の出力はサーボモータ１１
の一端に接続され、サーボモータの他端は定電圧回路３
の接地端子６に接続されている。Furthermore, the output of this preamplifier circuit 9 is transmitted to the servo motor 11.
One end of the servo motor is connected to the constant voltage circuit 3, and the other end of the servo motor is connected to the constant voltage circuit 3.
is connected to the ground terminal 6 of.
以上の構成のうち、定電圧電源２とカメラ制御回路３は
テレビカメラ側の構成部材であり、前置増幅回路７以下
の構成部材はテレビレンズ側に内蔵あるいは取り付けら
れているものである。Of the above configuration, the constant voltage power supply 2 and the camera control circuit 3 are components on the television camera side, and the components from the preamplifier circuit 7 onwards are built in or attached to the television lens side.
第２図は本考案のテレビレンズ用サーボ増幅回路に使用
される電流制限回路１０の一実施例を示したものであり
、トランジスタ２０のベース電圧はツェナーダイオード
２５によって制限され、このためエミッタ電流は抵抗２
８により制限されることになる。FIG. 2 shows an embodiment of the current limiting circuit 10 used in the servo amplifier circuit for a television lens according to the present invention.The base voltage of the transistor 20 is limited by the Zener diode 25, so that the emitter current is resistance 2
8.
したがって、ラッシュカレントを制限することが出来る
。Therefore, rush current can be limited.
この電流制限回路１０の制限量は使用電源の容量や定電
圧電源を用いている時はその許容電流値などを考慮して
決められるものである。The amount of limitation of the current limiting circuit 10 is determined by taking into consideration the capacity of the power source used, the allowable current value when a constant voltage power source is used, etc.
以上のように構成されるテレビレンズ用サーボ増幅回路
の動作を第３図に示す電力増幅回路９のプラス電源端に
流れる電流値のレベル図を参照して説明すると、制御信
号入力端子８に例えばカメラからのビデオ信号が入ると
、この信号は前置増幅回路７により図示せぬ規準電位に
対して比較増幅され、マイナス出力あるいはプラス出力
に変換される。The operation of the television lens servo amplification circuit configured as described above will be explained with reference to the level diagram of the current value flowing to the positive power supply terminal of the power amplification circuit 9 shown in FIG. When a video signal from a camera is input, this signal is compared and amplified with respect to a reference potential (not shown) by a preamplifier circuit 7, and converted into a negative output or a positive output.
さらに、電力増幅回路９により電力増幅がなされ、サー
ボモータ１１は正転あるいは逆転され、これがレンズの
絞り機構を駆動してビテ゛オ出力は一定に制御される。Further, the power amplification circuit 9 amplifies the power, and the servo motor 11 rotates forward or reverse, which drives the aperture mechanism of the lens, and the video output is controlled to be constant.
ここでビデオ信号の変化により電力増幅回路９に供給さ
れる電流値は、従来の電流制限回路を用いていないもの
では、第３図ａに示すようなラッシュカレント１００，
１０５がサーボモータ１１の起動時やモータの反転時な
どに発生し、定常電流の５〜６倍のラッシュカレントに
より小型テレビカメラのように容量の小さいバッテリー
及び電流容量の小さい定電圧電源を使用しているもので
は瞬間的に電源電圧が急激な低下をし、カメラ側のビデ
オ回路等に悪影響を与えていた。Here, the current value supplied to the power amplifier circuit 9 due to a change in the video signal is a rush current of 100, as shown in FIG.
105 occurs when the servo motor 11 is started or when the motor is reversed, and due to the rush current that is 5 to 6 times the steady current, it is difficult to use a small capacity battery and constant voltage power supply with small current capacity, such as in a small TV camera. In some cases, the power supply voltage suddenly drops suddenly, which adversely affects the camera's video circuit, etc.
しかしながら本考案のテレビレンズ用サーボ増幅回路に
は電流制御回路１０．１０が設けられているので、第３
図すに示すように、ラッシュカレント１００’、 １０
５’は電流制限回路１０．１０’により点線°１１５に
示すレベルに制限される。However, since the servo amplifier circuit for television lenses of the present invention is provided with the current control circuit 10.10, the third
As shown in the figure, rush current 100', 10
5' is limited by the current limiting circuit 10.10' to the level shown by the dotted line 115.
このレベルは電力増幅回路の正常な動作中の定常電流値
よりも少し高目に、電源の容量や定電圧電源の電流容量
等の諸元を考慮し設定されている。This level is set slightly higher than the steady current value during normal operation of the power amplifier circuit, taking into consideration specifications such as the capacity of the power supply and the current capacity of the constant voltage power supply.
したがって、ラッシュカレント１００’、 １０５’は
発生しようとしても電力増幅回路９への電流供給が電流
制限回路１０．１０’により頭打ちにされるもので、電
源電圧の低下を防止することができ、カメラ側のビデオ
回路等を正常に動作させ続けることが出来る。Therefore, even if rush currents 100' and 105' are attempted to occur, the current supply to the power amplifier circuit 9 is capped by the current limiting circuit 10, 10', which prevents a drop in the power supply voltage and This allows the side video circuit, etc. to continue operating normally.
次に本考案の他の実施例を説明する。Next, another embodiment of the present invention will be described.
第４図の実施例は第１図の実施例の一変形を示し、通常
前置増幅回路７の供給端電圧と電力増幅回路９の供給端
電圧とが異なる場合が多く、この場合前置増幅回路７の
電圧が低く設定されていることが多いので、前置増幅回
路７の供給電圧を定電圧素子１３．１３’により低くし
たものである。The embodiment shown in FIG. 4 shows a modification of the embodiment shown in FIG. Since the voltage of the circuit 7 is often set low, the voltage supplied to the preamplifier circuit 7 is lowered by the constant voltage element 13, 13'.
動作は第１図の実施例で説明した通りであるので詳述す
ることはしない。The operation is the same as described in the embodiment shown in FIG. 1, so detailed description thereof will not be given.
第５図の実施例は第１図の実施例のさらに他の変形例を
示すものであって、電力増幅回路９の電源供給を電源１
よりじかに取ったものである。The embodiment shown in FIG. 5 shows still another modification of the embodiment shown in FIG.
This was taken more directly.
これは、電力増幅回路９が電力増幅のためのものである
ので、供給電圧の変動に対してさほど影響されないため
に、定電圧電源２から必ずしも電源供給を受ける必要が
ないということと、電流を多く消費するという所に着目
して行なわれた改良である。This is because the power amplification circuit 9 is for power amplification, so it is not affected much by fluctuations in the supply voltage, so it does not necessarily need to receive power from the constant voltage power supply 2, and the current This improvement was made with a focus on consuming more.
動作は第１図の実施例で説明した通りであるので詳述は
しない。The operation is the same as described in the embodiment shown in FIG. 1, so a detailed description thereof will not be given.
以上説明してきた実施例はテレビカメラのオートアイリ
ス回路に用いられた回路例であるが、他にズーム用サー
ボ回路やフォーカス用サーボ回路においても同様に用い
られ、さらにこれら複数のサーボ回路を備えているレン
ズに於いては全体として電流を制限する様構成しても同
様の効果が得られ、第６図にこの場合の回路例を示す。The embodiment described above is an example of a circuit used in an auto iris circuit of a television camera, but it can also be used in a zoom servo circuit or a focus servo circuit, and is further equipped with a plurality of these servo circuits. A similar effect can be obtained by configuring the lens to limit the current as a whole, and FIG. 6 shows an example of the circuit in this case.
第６図は複数のサーボ増幅回路を備えたテレビカメラレ
ンズに於いて、各サーボ増幅回路に流れる電流の全体を
一つの電流制限回路を通して供給したものであり、図面
ではズーム用サーボモータ１１ ａとフォーカス用サー
ボモータ１１ ｂとオートアイリス用サーボモータ１１
Ｃをそれぞれサーボ増幅回路４０１．４０ ｂ 、４
０ Ｃで駆動するもので、このサーボ増幅回路４０ ａ
、４０ ｂ 、４０ Ｃは第１図、第４図、第５図の
実施例における前置増幅回路７と電力増幅回路９の働き
を合せ持つもので、動作は制御信号入力端子８ａ、８ｂ
、８Ｃの信号によりサーボ増幅回路４０ ａ 、４０
ｂ 、４０ Ｃで処理・増幅されサーボモータ１１ ａ
、１１ ｂ、１１ Ｃが駆動されるものである。FIG. 6 shows a TV camera lens equipped with a plurality of servo amplifier circuits, in which the entire current flowing to each servo amplifier circuit is supplied through one current limiting circuit. Focus servo motor 11 b and auto iris servo motor 11
C are respectively servo amplifier circuits 401.40b, 4
This servo amplifier circuit 40a is driven at 0C.
, 40b, and 40C have the functions of the preamplifier circuit 7 and the power amplifier circuit 9 in the embodiments shown in FIGS. 1, 4, and 5.
, 8C signals cause the servo amplifier circuits 40 a , 40
b, processed and amplified at 40 C and servo motor 11a
, 11b, and 11C are driven.
ここでラッシュカレントが発生した場合、どのサーボ増
幅回路で発生しても電源に与える影響、ひいてはカメラ
のビデオ回路等に与える悪影響を防止できるものであり
、本考案の目的を十分に達成しうるものである。If a rush current occurs here, no matter which servo amplification circuit it occurs in, it can prevent the effect on the power supply and even the negative effect on the video circuit of the camera, etc., and can fully achieve the purpose of the present invention. It is.
以上に述べた所より明らかなように、本考案のテレビレ
ンズ用サーボ増幅回路はサーボモータなどにより発生す
る異常電流（ラッシュカレント）が原因となる急激な電
流電圧の低下、及びこれによるカメラ側のビデオ回路や
各種制御回路への悪影響を未然に防ぐものであり、特に
小型カメラなどでは絶大な効果が得られ、安定したテレ
ビ画像を送ることが出来る。As is clear from the above description, the servo amplifier circuit for television lenses of the present invention is capable of handling sudden drops in current and voltage caused by abnormal currents (rush currents) generated by servo motors, etc. This prevents adverse effects on video circuits and various control circuits, and is especially effective for small cameras, allowing stable television images to be sent.
第１図は本考案のテレビレンズ用サーボ増幅回路の一実
施例を示す回路図、第２図は本考案のテレビレンズ用サ
ーボ増幅回路の電流制限回路の一例を示した図、第３図
は本考案のテレビレンズ用サーボ増幅回路のサーボ駆動
回路のプラス電源供給端に流れる電流の時間的変化を示
した図、第４図、第５図、第６図は本考案のテレビレン
ズ用サーボ増幅回路の他の実施例を示す回路図。
１・・・・・・電源、２・・・・・・定電圧電源、７・
・・・・・前置増幅回路、９・・・・・・電力増幅回路
、１０・・・・・・電流制限回路、１１・・・・・・サ
ーボモータ。FIG. 1 is a circuit diagram showing an embodiment of the servo amplifier circuit for a television lens according to the present invention, FIG. 2 is a diagram showing an example of the current limiting circuit of the servo amplifier circuit for a television lens according to the present invention, and FIG. Figures 4, 5, and 6 are diagrams showing temporal changes in the current flowing through the positive power supply terminal of the servo drive circuit of the servo amplifier circuit for a television lens according to the present invention. FIG. 7 is a circuit diagram showing another example of the circuit. 1...Power supply, 2...Constant voltage power supply, 7.
...Preamplifier circuit, 9...Power amplifier circuit, 10... Current limiting circuit, 11... Servo motor.
Claims (4)
路とを共用の電源とし、テレビカメラあるいはテレビレ
ンズからの入力信号に応じてサーボモータを駆動するテ
レビレンズ用サーボ増幅回路において、前記共用電源に
対して前記テレビレンズ用サーボ増幅回路を該テレビレ
ンズ用サーボ増幅回路専用の電流制限回路を介して接続
し、前記共用電源から前記テレビレンズ用サーボ増幅回
路へは所定電流以上の電流が供給されないようにして前
記共用電源の電圧低下を防止したことを特徴とするテレ
ビレンズ用サーボ増幅回路。(1) In a servo amplifier circuit for a television lens that uses a common power supply for a servo amplifier circuit for a television lens and a camera-side control circuit, and drives a servo motor according to an input signal from a television camera or a television lens, the shared power supply In contrast, the television lens servo amplifier circuit is connected through a current limiting circuit dedicated to the television lens servo amplifier circuit, so that a current exceeding a predetermined current is not supplied from the common power supply to the television lens servo amplifier circuit. A servo amplifier circuit for a television lens, characterized in that a voltage drop in the shared power source is prevented by:
用いて供給したことを特徴とする実用新案登録請求の範
囲第１項記載のテレビレンズ用サーボ増幅回路。(2) The servo amplifier circuit for a television lens according to claim 1, which is a registered utility model, characterized in that power is supplied to the servo amplifier circuit using a constant voltage power supply.
を有する前置増幅回路と、この前置増幅回路の出力端に
接続されサーボモータを駆動する為の電力増幅回路とよ
りなり、この電力増幅回路の電源供給を前記電流制限回
路を介して行なったことを特徴とする実用新案登録請求
の範囲第１項記載のテレビレンズ用サーボ増幅回路。(3) The servo amplifier circuit includes a preamplifier circuit having a terminal for receiving the input signal, and a power amplifier circuit connected to the output terminal of the preamplifier circuit for driving the servo motor. The servo amplifier circuit for a television lens according to claim 1, wherein power is supplied to the circuit through the current limiting circuit.
いて供給したことを特徴とする実用新案登録請求の範囲
第３項記載のテレビレンズ用サーボ増幅回路。(4) The servo amplifier circuit for a television lens according to claim 3, wherein power is supplied to the preamplifier circuit using a constant voltage power supply.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977094930U JPS5926697Y2 (en) | 1977-07-16 | 1977-07-16 | Servo amplifier circuit for TV lens |
| DE2830697A DE2830697B2 (en) | 1977-07-16 | 1978-07-12 | Servo amplifier for driving a servo motor of a television camera lens device |
| FR7821048A FR2397751A1 (en) | 1977-07-16 | 1978-07-13 | Hand-held TV camera - has current limiter between operating voltage source and servo motor actuating camera controls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1977094930U JPS5926697Y2 (en) | 1977-07-16 | 1977-07-16 | Servo amplifier circuit for TV lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5422416U JPS5422416U (en) | 1979-02-14 |
| JPS5926697Y2 true JPS5926697Y2 (en) | 1984-08-02 |
Family
ID=14123677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1977094930U Expired JPS5926697Y2 (en) | 1977-07-16 | 1977-07-16 | Servo amplifier circuit for TV lens |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS5926697Y2 (en) |
| DE (1) | DE2830697B2 (en) |
| FR (1) | FR2397751A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5866904A (en) * | 1981-10-17 | 1983-04-21 | Fuji Photo Optical Co Ltd | Control circuit for servocontrol module |
| JP2885376B2 (en) * | 1989-03-13 | 1999-04-19 | 富士写真光機株式会社 | Lens device for TV camera |
| JP2794631B2 (en) * | 1989-05-10 | 1998-09-10 | キヤノン株式会社 | Camera with power zoom function and interchangeable camera and interchangeable lens with power zoom function |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4923631A (en) * | 1972-06-22 | 1974-03-02 | ||
| JPS5131651U (en) * | 1974-08-29 | 1976-03-08 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3061673A (en) * | 1959-02-05 | 1962-10-30 | Thompson Ramo Wooldridge Inc | Servo system for light level control |
| DE1917015C3 (en) * | 1969-04-02 | 1975-11-20 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Arrangement for regulating the amplitude of the output signal of a television pickup tube |
| US3593078A (en) * | 1969-09-08 | 1971-07-13 | North American Rockwell | Starting and operating control for an ac motor powered by a dc power supply |
| DE2113942B2 (en) * | 1971-03-23 | 1973-09-13 | Siemens Ag, 1000 Berlin U. 8000 Muenchen | Camera, in particular television camera |
| US3848123A (en) * | 1973-03-30 | 1974-11-12 | Rca Corp | Automatic brightness control for image intensifier tube |
-
1977
- 1977-07-16 JP JP1977094930U patent/JPS5926697Y2/en not_active Expired
-
1978
- 1978-07-12 DE DE2830697A patent/DE2830697B2/en active Granted
- 1978-07-13 FR FR7821048A patent/FR2397751A1/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4923631A (en) * | 1972-06-22 | 1974-03-02 | ||
| JPS5131651U (en) * | 1974-08-29 | 1976-03-08 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2397751B1 (en) | 1982-04-23 |
| FR2397751A1 (en) | 1979-02-09 |
| DE2830697C3 (en) | 1984-10-04 |
| DE2830697B2 (en) | 1979-11-29 |
| DE2830697A1 (en) | 1979-01-18 |
| JPS5422416U (en) | 1979-02-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9152012B2 (en) | Power source switching device and electronic appliance | |
| US4447768A (en) | Motor control device | |
| JPS5926697Y2 (en) | Servo amplifier circuit for TV lens | |
| JPH11346435A (en) | Power supply device | |
| US4525637A (en) | Integrated circuit having an input voltage-clamping function and an input current-detecting function | |
| US6771309B1 (en) | Camera controller providing correction capability for variances in circuits | |
| US4415249A (en) | Motor drive circuit for camera | |
| US4667224A (en) | White balance correcting device | |
| US4750056A (en) | Power circuit for a recording unit in an electronic camera | |
| US4498753A (en) | Photometric apparatus for cameras | |
| US4417280A (en) | Servo amplifier for television camera lens | |
| US4239358A (en) | Alarm device control system in a camera | |
| JP2517455Y2 (en) | Battery drain detection circuit for camera | |
| JP3217542B2 (en) | Distance measuring device with MOS structure | |
| JPS63246081A (en) | Still video camera | |
| JP2950885B2 (en) | Photometric device | |
| JPH0411413Y2 (en) | ||
| KR950000413Y1 (en) | Ccd auto-iris driving circuit | |
| JP3191933B2 (en) | camera | |
| JP2920683B2 (en) | camera | |
| JPS5846406Y2 (en) | Serborokoriyouseigiyosouchi | |
| JPH0230277A (en) | Image pickup device | |
| KR910003760Y1 (en) | Noise reducing circuit | |
| KR940005291Y1 (en) | Removing device for iris oscillation of camcorder | |
| KR900004346Y1 (en) | Compare and detecting syn circuit of maximum signal |