JPH07154659A - Power supply input control circuit for automatic aperture lens driver - Google Patents

Power supply input control circuit for automatic aperture lens driver

Info

Publication number
JPH07154659A
JPH07154659A JP5297951A JP29795193A JPH07154659A JP H07154659 A JPH07154659 A JP H07154659A JP 5297951 A JP5297951 A JP 5297951A JP 29795193 A JP29795193 A JP 29795193A JP H07154659 A JPH07154659 A JP H07154659A
Authority
JP
Japan
Prior art keywords
voltage
switch
power supply
power
driving device
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.)
Granted
Application number
JP5297951A
Other languages
Japanese (ja)
Other versions
JP2541132B2 (en
Inventor
Yasushi Matsuo
靖士 松尾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP5297951A priority Critical patent/JP2541132B2/en
Publication of JPH07154659A publication Critical patent/JPH07154659A/en
Application granted granted Critical
Publication of JP2541132B2 publication Critical patent/JP2541132B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To surely supply a predetermined input power required by a power supply stabilizing section of an automatic aperture driver for a predetermined time by generating a switch ON signal after the lapse of a predetermined time when a voltage detection circuit detects a predetermined voltage. CONSTITUTION:A power supply input control circuit 1 is made up of a voltage detection circuit 10, a timer circuit 11, and a switch 12. The voltage detection circuit 10 outputs a steady-state voltage detection signal when a voltage at an input terminal of the switch 12 reaches a predetermined voltage. The timer circuit 11 generates a switch ON signal after the lapse of a predetermined time from a time when the steady-state voltage detection signal is received. The predetermined time is decided by adding a sufficient time margin to the time required for the voltage at the input terminal of the switch 12 to be sufficiently stabilized to a steady-state voltage. The switch 12 opens between the input and output till the switch ON signal is received from application of power and closes between the input and output upon the receipt of the switch ON signal.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、テレビカメラ装置にお
ける自動絞りレンズ駆動装置の電源安定化部に関し、特
にその電源安定化部における入力電圧の起動を確実にす
る電源入力制御回路に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply stabilizing section of an automatic aperture lens driving device in a television camera apparatus, and more particularly to a power supply input control circuit for ensuring activation of an input voltage in the power stabilizing section.

【0002】[0002]

【従来の技術】テレビカメラ装置における自動絞りレン
ズ駆動装置については特開昭57−11329号公報に
示されている。この自動絞りレンズ駆動装置における所
要電力は図3に示すような電源安定化部4から供給され
る。この電源安定化部4は、公知の電源安定化回路であ
り、電源出力制御トランジスタ41、誤差増幅器42、
電圧分割抵抗43,44、および基準電圧源44を有し
ている。符号45は電圧検出点、47は電源出力端子、
5は自動絞りレンズ駆動装置におけるレンズアクチュエ
ータ等の負荷をそれぞれ示す。
2. Description of the Related Art An automatic diaphragm lens driving device in a television camera device is disclosed in Japanese Patent Application Laid-Open No. 57-11329. The required power in this automatic diaphragm lens driving device is supplied from the power supply stabilizing unit 4 as shown in FIG. The power supply stabilization unit 4 is a known power supply stabilization circuit and includes a power supply output control transistor 41, an error amplifier 42,
It has voltage dividing resistors 43 and 44, and a reference voltage source 44. Reference numeral 45 is a voltage detection point, 47 is a power output terminal,
Reference numerals 5 indicate loads such as a lens actuator in the automatic diaphragm lens driving device.

【0003】図3には、自動絞りレンズ駆動装置用電源
安定化部4へ直流電流を供給する回路が併せて示してあ
る。主電源部2は、商用AC電源を受けて直流に変換
し、定電流型直流電流を出力端子21から出力する定電
流源である。カメラ部3は、同軸ケーブル21を介して
直流電流を入力端子30に受け、CCD回路などのため
の直流電流を安定化電源で生成する。カメラ部3の電源
出力端子31からは入力端子30に受けたものと同じ直
流電流が出力される。
FIG. 3 also shows a circuit for supplying a direct current to the power stabilizing unit 4 for the automatic diaphragm lens driving device. The main power supply unit 2 is a constant current source that receives a commercial AC power source, converts it into a direct current, and outputs a constant current type direct current from the output terminal 21. The camera unit 3 receives a direct current in the input terminal 30 via the coaxial cable 21, and generates a direct current for a CCD circuit or the like with a stabilized power supply. The same DC current as that received by the input terminal 30 is output from the power output terminal 31 of the camera unit 3.

【0004】図4に示す電源方式のテレビカメラ装置
は、定電流型の電源重畳テレビカメラシステムと称さ
れ、主電源部2が定電流型直流電源であり、主電源部2
とカメラ部3との間で信号の授受をする同軸ケーブル2
1で直流電流をカメラ部3へ供給している。この種のテ
レビカメラ装置は、無人室の侵入者を監視する防犯用監
視装置や遠隔無人通信中継施設における施設監視装置等
に備えられる。これらの産業用テレビカメラ装置では、
主電源部2は電源室に設けられ、カメラ部は他の無人室
や屋外に設置される。カメラ部の視野の明るさにかかわ
らず、適正な絞りとなるように、自動絞りレンズが用い
られる。両者間は信号の授受をするための同軸ケーブル
21で接続され、電源用の直流電流はその同軸ケーブル
21で送られる。同軸ケーブル21上の信号は、主電源
部2及びカメラ部本体3にそれぞれ設けられている信号
電源分離回路で分離される。電源出力端子31には、入
力端子30に受けた直流電源がそのまま供給される。
The power source type television camera device shown in FIG. 4 is called a constant current type power source superimposing television camera system, and the main power source unit 2 is a constant current type DC power source, and the main power source unit 2
Coaxial cable 2 for exchanging signals between the camera unit 3 and the camera unit 3.
1, the DC current is supplied to the camera unit 3. This type of television camera device is provided in a crime prevention monitoring device for monitoring an intruder in an unmanned room, a facility monitoring device in a remote unmanned communication relay facility, or the like. In these industrial TV camera devices,
The main power supply unit 2 is provided in the power supply room, and the camera unit is installed in another unmanned room or outdoors. An automatic iris lens is used so as to obtain an appropriate iris regardless of the brightness of the visual field of the camera section. The two are connected by a coaxial cable 21 for exchanging signals, and a direct current for power supply is sent by the coaxial cable 21. The signals on the coaxial cable 21 are separated by signal power supply separation circuits provided in the main power supply unit 2 and the camera unit main body 3, respectively. The DC power received by the input terminal 30 is directly supplied to the power output terminal 31.

【0005】図3に示した自動絞りレンズ駆動装置用電
源安定化部4はシリーズレギュレータである。この電源
安定化部4では、入力端子40と出力端子47との間に
直列に挿入されて、負荷5へ出力される電圧VL 一定値
に制御するための電源出力制御トランジスタ41が備え
てある。電源出力制御トランジスタとしては、PNP型
又はNPN型のトランジスタが用いられるが、PNP型
にはNPN型より消費電力が小さいという特徴がある。
The power stabilizing unit 4 for the automatic diaphragm lens driving device shown in FIG. 3 is a series regulator. The power supply stabilization unit 4 includes a power supply output control transistor 41 that is inserted in series between the input terminal 40 and the output terminal 47 and that controls the voltage V L output to the load 5 to a constant value V L. . As the power supply output control transistor, a PNP type or NPN type transistor is used, but the PNP type has a feature that it consumes less power than the NPN type.

【0006】[0006]

【発明が解決しようとする課題】図3に示すように電源
出力制御トランジスタ41にPNP型トランジスタを使
用した回路形式においては、入力端子40に供給される
入力電圧が所定値よりも低い場合に出力電圧VL が設定
値に達していない時には、誤差増幅器42はその出力電
圧VL を所定値まで上げようとして最大の能力で出力制
御トランジスタ41を駆動する。すると、該トランジス
タ41のベース駆動電流が増大し、かつエミッタ・コレ
クタ間電圧が飽和方向に働くため過大なベース電流およ
びエミッタ・コレクタ間負荷電流が流れることとなる。
このため入力電流の増大現象(いわゆる山越電流)が発
生し、この電流のために入力電圧源の電源出力カインピ
ーダンスが高い場合には、軽負荷にもかかわらず、電源
出力が立ち上がらないという問題が発生する。特に定電
流型電源重畳テレビカメラシステムでは、電源投入から
定常動作に至るまでの期間(通常約1〜3秒間程度)に
おいては、電源出力インピーダンスが高い状態を呈する
ため、図3の形式の電源安定化回路を採用した自動絞り
レンズ駆動装置を前記カメラシステムに使用した際に、
自動絞りレンズ駆動装置内の電源安定化部に山越電流が
発生することとなり、ひいては電源重畳テレビカメラシ
ステム自体の電源までもが立ち上がらなくなることがあ
るという重大な欠点があった。
As shown in FIG. 3, in the circuit form in which the PNP type transistor is used as the power output control transistor 41, the output is made when the input voltage supplied to the input terminal 40 is lower than a predetermined value. When the voltage V L has not reached the set value, the error amplifier 42 drives the output control transistor 41 with the maximum capacity in order to raise the output voltage V L to a predetermined value. Then, the base drive current of the transistor 41 increases, and the emitter-collector voltage acts in the saturation direction, so that excessive base current and emitter-collector load current flow.
For this reason, an input current increase phenomenon (so-called Yamagoshi current) occurs, and if the power output impedance of the input voltage source is high due to this current, there is the problem that the power output does not rise despite the light load. appear. Particularly, in the constant current type power supply superimposing TV camera system, the power supply output impedance is high during the period from power-on to steady operation (usually about 1 to 3 seconds). When using the automatic diaphragm lens drive device that adopts the digitized circuit in the camera system,
There has been a serious drawback that a Yamagoshi current is generated in the power source stabilizing section in the automatic aperture lens driving device, and eventually the power source of the power superimposing television camera system itself may not be able to start up.

【0007】[0007]

【課題を解決するための手段】本発明は、定電流型直流
電流源から同軸ケーブルを介して直流電流の供給を受け
る自動絞りレンズ付きテレビカメラ装置に設けられ、前
記自動絞りレンズを駆動する装置の電源安定化部へ前記
テレビカメラ装置本体から出力される自動絞りレンズ駆
動装置用電流を安定な電圧で供給する自動絞りレンズ駆
動装置用電源入力制御回路において、前記テレビカメラ
装置本体の電流出力端子から前記自動絞りレンズ駆動装
置電源安定化部の電源入力端子へ前記自動絞りレンズ駆
動装置用電流を導く電流路へ直列に挿入されたスイッチ
と、該スイッチの入力端の電圧VA が所定電圧VC にま
で上昇したことを検出する電圧検出回路と、この電圧検
出回路が前記所定電圧VC を検出した時T1 から所定時
間ΔTが経過した時T2 にスイッチON信号を生成する
タイマ回路とを備えてなり、前記スイッチは前記スイッ
チON信号を受けたときに導通することを特徴とする自
動絞りレンズ駆動装置用電源入力制御回路である。
DISCLOSURE OF THE INVENTION The present invention is provided in a television camera device with an automatic aperture lens, which receives a direct current from a constant current type direct current source via a coaxial cable, and drives the automatic aperture lens. In the power supply control circuit for the automatic aperture lens driving device, which supplies the current for the automatic aperture lens driving device output from the television camera device main body to the power stabilizing unit of, at a stable voltage, the current output terminal of the television camera device main body To the power input terminal of the automatic aperture lens driving device power supply stabilizing unit, the switch inserted in series in the current path for guiding the automatic aperture lens driving device current, and the voltage V A at the input end of the switch is the predetermined voltage V a voltage detection circuit for detecting that rose to C, T when the voltage detecting circuit has passed the predetermined voltage V C of the predetermined time T 1 when the detected ΔT is 2 is a timer circuit for generating a switch ON signal, and the switch is conductive when it receives the switch ON signal.

【0008】[0008]

【実施例】次に実施例を挙げ、本願発明を一層詳しく説
明する。図1は本願発明の一実施例を備えたテレビジョ
ンカメラ装置における電源装置の構成を示すブロック回
路図である。図1の電源装置は、図3に示した電源装置
においてカメラ本体部3の電源出力端子31と自動絞り
レンズ駆動装置用電源安定化部4の入力端子40との間
に本発明の一実施例の自動絞りレンズ駆動装置用電源入
力制御回路1を挿入してなる。
The present invention will be described in more detail with reference to the following examples. FIG. 1 is a block circuit diagram showing the configuration of a power supply device in a television camera device having an embodiment of the present invention. The power supply device of FIG. 1 is an embodiment of the present invention between the power supply output terminal 31 of the camera body 3 and the input terminal 40 of the power stabilization unit 4 for the automatic diaphragm lens driving device in the power supply device shown in FIG. The power input control circuit 1 for the automatic diaphragm lens driving device is inserted.

【0009】電源入力制御回路1は電圧検出回路10、
タイマ回路11およびスイッチ12からなる。図2は、
カメラ本体部3の電源出力端子31の出力電圧V0 (電
源入力制御回路1の入力電圧)の波形および電源安定化
部4の入力端子40の入力電圧VIN(電源入力制御回路
1の出力電圧)の波形を示すタイミング図である。カメ
ラ部本体3の電源出力端子31の電圧V0 は主電源部2
から出力される直流電圧そのままである。そこで、図2
のV0 の波形は、主電源部2の出力端子20から出力さ
れる電圧波形と同じである。
The power input control circuit 1 includes a voltage detection circuit 10,
It is composed of a timer circuit 11 and a switch 12. Figure 2
Waveform of output voltage V 0 (input voltage of power supply input control circuit 1) of power supply output terminal 31 of camera body 3 and input voltage V IN of input terminal 40 of power supply stabilization unit 4 (output voltage of power supply input control circuit 1) 6 is a timing chart showing a waveform of FIG. The voltage V 0 of the power supply output terminal 31 of the camera body 3 is the main power supply 2
The DC voltage output from is unchanged. Therefore, FIG.
The waveform of V 0 is the same as the voltage waveform output from the output terminal 20 of the main power supply unit 2.

【0010】主電源部2の出力電圧および電流は、図2
のV0 の波形図の如くに、電源投入から約1.5秒の起
動期間中には3VDC及び25mA(定電流)である。
主電源部2がカメラ部本体3へ3VDCの電源を与える
と、カメラ部本体3は約0.3VP-P の主電源部スター
トアップパルスを同軸ケーブル21経由で約2秒間送り
出す。主電源部2は、電源投入の直後からそのスタート
アップパルスを受信できれば、同軸ケーブル21及びカ
メラ部が正常であると判定し、電源投入時点T0 から
1.5秒後に出力電圧V0 を3VDCから10VDCへ
向けて上昇させる。もし、スタートアップパルスを受信
できなかったときは、同軸ケーブル21若しくはカメラ
部に短絡があったか又は同軸ケーブル21の片端に適合
しないカメラ部を接続したことを示すので、主電源部2
は出力端子20から出力していた電源を遮断する。
The output voltage and current of the main power supply section 2 are shown in FIG.
As shown in the waveform diagram of V 0 , the voltage is 3 VDC and 25 mA (constant current) during the startup period of about 1.5 seconds after the power is turned on.
When the main power supply unit 2 supplies 3VDC power to the camera unit body 3, the camera unit body 3 sends out a main power supply unit start-up pulse of about 0.3V PP via the coaxial cable 21 for about 2 seconds. The main power supply unit 2 determines that the coaxial cable 21 and the camera unit are normal if it can receive the start-up pulse immediately after power-on, and outputs the output voltage V 0 from 3VDC 1.5 seconds after the power-on time T 0. Increase towards 10VDC. If the startup pulse cannot be received, it means that there is a short circuit in the coaxial cable 21 or the camera section, or that a camera section that does not match one end of the coaxial cable 21 is connected.
Shuts off the power output from the output terminal 20.

【0011】上述の如く、主電源部2は、出力端子20
へ接続される負荷回路を保護するために、約1.5秒の
起動期間を設け、その起動期間には負荷回路に短絡があ
っても負荷回路の損傷を拡大しない3VDCという低い
値に出力電圧を抑制し、負荷回路が正常であることを確
認してから出力電圧を10VDCという定常電圧に上昇
させる。
As described above, the main power source section 2 has the output terminal 20.
In order to protect the load circuit connected to the output circuit, a start-up period of about 1.5 seconds is provided, and even if there is a short circuit in the load circuit during the start-up period, the output voltage is as low as 3VDC that does not increase the damage to the load circuit. After confirming that the load circuit is normal, the output voltage is increased to a steady voltage of 10 VDC.

【0012】起動期間における3VDCという定常電圧
(10VDC)よりはるかに低い出力電圧V0 が電源安
定化部4に入力されるといわゆる山越電流がカメラ部本
体3の電源出力端子31から出力され、テレビカメラ装
置全体の電源起動ができないことは前述のとおりであ
る。この電源起動不能の現象を確実に防ぐために、実施
例の電源入力制御回路1が設けてある。
When the output voltage V 0, which is much lower than the steady voltage (10 VDC) of 3 VDC in the start-up period, is input to the power supply stabilizing unit 4, a so-called Yamagoshi current is output from the power supply output terminal 31 of the camera body 3, and the television As described above, the power of the entire camera device cannot be activated. In order to surely prevent the phenomenon that the power supply cannot be started, the power supply input control circuit 1 of the embodiment is provided.

【0013】電圧検出回路10はスイッチ12の入力端
の電圧VA (電源出力端子31の出力電圧V0 に実質上
同じ)が所定電圧VC にまで上昇した時T1 に定常電圧
検出信号を出力する。この実施例ではVC は8Vであ
る。タイマ回路11は定常電圧検出信号を受けてから所
定時間ΔTが経過した時点T2 にスイッチON信号を発
生する。この実施例ではΔTは約1.4秒である。所定
時間ΔTは、電圧VA が定常電圧に安定化するのに必要
な時間に十分な余裕時間を加えて定められる。スイッチ
12は、電源投入時点T0 からスイッチON信号の受信
時点T2 までは入力出力間を遮断しており、スイッチO
N信号を受信した時に入力出力間を導通にする。
The voltage detection circuit 10 outputs a steady voltage detection signal at T 1 when the voltage V A at the input end of the switch 12 (substantially the same as the output voltage V 0 at the power output terminal 31) rises to a predetermined voltage V C. Output. In this example, V C is 8V. The timer circuit 11 generates a switch ON signal at a time point T 2 when a predetermined time ΔT has elapsed after receiving the steady voltage detection signal. In this example, ΔT is about 1.4 seconds. The predetermined time ΔT is determined by adding a sufficient margin time to the time required for the voltage V A to stabilize to a steady voltage. The switch 12 blocks the input and output from the time point T 0 when the power is turned on to the time point T 2 when the switch ON signal is received.
When the N signal is received, the input and output are electrically connected.

【0014】以上に述べた電源入力制御回路1の作用に
より、電源安定化部4は起動電圧として十分な大きさの
定常電圧(10VDC)を受けるから、トランジスタ4
1のベース電流及びコレクタ電流は過大にならず、電源
安定化部4は出力電圧を規格電圧に確実に立上げ、負荷
5には規格の負荷電圧VL を供給する。
Due to the operation of the power supply input control circuit 1 described above, the power supply stabilizing unit 4 receives a steady voltage (10 VDC) of a sufficient magnitude as the starting voltage, so that the transistor 4
The base current and collector current of 1 do not become excessive, the power supply stabilizing unit 4 surely raises the output voltage to the standard voltage, and supplies the load 5 with the standard load voltage V L.

【0015】なお、以上の実施例では電圧、電流および
時間を具体敵に示したが、本願発明がこの実施例に限定
されるものでないことは勿論である。
Although the voltage, the current and the time are shown as specific opponents in the above embodiment, it goes without saying that the present invention is not limited to this embodiment.

【0016】[0016]

【発明の効果】以上に説明したように、本願発明による
自動絞りレンズ駆動装置用電源入力制御回路は、自動絞
りレンズ駆動装置の電源安定化部が必要とする所定入力
電源値を所定の時間に確実に供給することを可能にし、
定電流型の電源重畳テレビカメラシステムに採用された
場合、特に有効である。
As described above, the power supply input control circuit for the automatic aperture lens driving device according to the present invention sets the predetermined input power value required by the power stabilizing unit of the automatic aperture lens driving device at a predetermined time. Enable reliable supply,
It is particularly effective when it is adopted in a constant current type power supply superimposing television camera system.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明になる自動絞りレンズ駆動装置用電源入
力制御回路の一実施例を備えたテレビカメラ装置用電源
装置の回路ブロック図である。
FIG. 1 is a circuit block diagram of a power supply device for a television camera device including an embodiment of a power input control circuit for an automatic diaphragm lens driving device according to the present invention.

【図2】図1の実施例における入力電圧および出力電圧
の波形図である。
FIG. 2 is a waveform diagram of an input voltage and an output voltage in the embodiment of FIG.

【図3】従来のテレビカメラ装置用電源装置の回路ブロ
ック図である。
FIG. 3 is a circuit block diagram of a conventional power supply device for a television camera device.

【符号の説明】[Explanation of symbols]

1 自動絞りレンズ駆動装置用電源入力制御回路 2 主電源部 3 カメラ部本体 4 自動絞りレンズ駆動装置用電源安定化部 5 負荷 10 電圧検出回路 11 タイマ回路 12 スイッチ 31 カメラ部本体の電源出力端子 40 自動絞りレンズ駆動装置用電源安定化部入力端子 41 電源出力制御トランジスタ 42 誤差増幅器 43,44 電圧分割抵抗 45 出力電圧検出点 46 基準電圧源 1 Power Supply Control Circuit for Automatic Aperture Lens Driving Device 2 Main Power Supply Unit 3 Camera Main Unit 4 Power Supply Stabilizing Unit for Automatic Aperture Lens Driving Device 5 Load 10 Voltage Detection Circuit 11 Timer Circuit 12 Switch 31 Power Supply Output Terminal of Camera Unit 40 Power supply stabilization unit input terminal for automatic diaphragm lens driving device 41 Power supply output control transistor 42 Error amplifier 43, 44 Voltage division resistor 45 Output voltage detection point 46 Reference voltage source

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 定電流型直流電流源から同軸ケーブルを
介して直流電流の供給を受ける自動絞りレンズ付きテレ
ビカメラ装置に設けられ、前記自動絞りレンズを駆動す
る装置の電源安定化部へ前記テレビカメラ装置本体から
出力される自動絞りレンズ駆動装置用電流を安定な電圧
で供給する自動絞りレンズ駆動装置用電源入力制御回路
において、 前記テレビカメラ装置本体の電流出力端子から前記自動
絞りレンズ駆動装置電源安定化部の電源入力端子へ前記
自動絞りレンズ駆動装置用電流を導く電流路へ直列に挿
入されたスイッチと、該スイッチの入力端の電圧VA
所定電圧VC にまで上昇したことを検出する電圧検出回
路と、この電圧検出回路が前記所定電圧VC を検出した
時T1 から所定時間ΔTが経過した時T2 にスイッチO
N信号を生成するタイマ回路とを備えてなり、 前記スイッチは前記スイッチON信号を受けたときに導
通することを特徴とする自動絞りレンズ駆動装置用電源
入力制御回路。
1. A television camera device with an automatic iris lens, which is supplied with a direct current from a constant current type direct current source through a coaxial cable, and is provided to a power source stabilizing section of a device for driving the automatic iris lens to the television. In a power input control circuit for an automatic diaphragm lens driving device that supplies a current for the automatic diaphragm lens driving device output from the camera device main body with a stable voltage, the automatic diaphragm lens driving device power supply is supplied from a current output terminal of the television camera device main body. A switch inserted in series in a current path for guiding the current for the automatic diaphragm lens driving device to the power supply input terminal of the stabilizing unit, and detecting that the voltage V A at the input end of the switch has risen to a predetermined voltage V C And a switch O at T 2 when a predetermined time ΔT has elapsed from the time T 1 when the voltage detection circuit detects the predetermined voltage V C.
A power supply input control circuit for an automatic aperture lens driving device, comprising: a timer circuit for generating an N signal, wherein the switch conducts when receiving the switch ON signal.
【請求項2】 前記所定電圧VC は、前記スイッチ入力
端における起動中電圧VA =VT と定常電圧VA =VS
との間の大きさであり、 前記ΔTは、スイッチ入力端電圧VA が前記起動中電圧
T から前記定常電圧VS にまで上昇すると予定されて
いる過度期間よりやや長く設定してあることを特徴とす
る請求項1に記載の自動絞りレンズ駆動装置用電源入力
制御回路。
2. The predetermined voltage V C is a starting voltage V A = V T and a steady voltage V A = V S at the switch input terminal.
And ΔT is set to be slightly longer than the transient period in which the switch input terminal voltage V A is expected to rise from the starting voltage V T to the steady voltage V S. The power input control circuit for the automatic diaphragm lens driving device according to claim 1.
JP5297951A 1993-11-29 1993-11-29 Power input control circuit for automatic diaphragm lens drive Expired - Fee Related JP2541132B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5297951A JP2541132B2 (en) 1993-11-29 1993-11-29 Power input control circuit for automatic diaphragm lens drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5297951A JP2541132B2 (en) 1993-11-29 1993-11-29 Power input control circuit for automatic diaphragm lens drive

Publications (2)

Publication Number Publication Date
JPH07154659A true JPH07154659A (en) 1995-06-16
JP2541132B2 JP2541132B2 (en) 1996-10-09

Family

ID=17853204

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5297951A Expired - Fee Related JP2541132B2 (en) 1993-11-29 1993-11-29 Power input control circuit for automatic diaphragm lens drive

Country Status (1)

Country Link
JP (1) JP2541132B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100406605B1 (en) * 1995-12-20 2004-03-18 삼성테크윈 주식회사 Device and method for preventing over current of camera
CN102142770A (en) * 2011-04-08 2011-08-03 上海交通大学 Series flyback switch power supply controlled by hysteresis loop

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100406605B1 (en) * 1995-12-20 2004-03-18 삼성테크윈 주식회사 Device and method for preventing over current of camera
CN102142770A (en) * 2011-04-08 2011-08-03 上海交通大学 Series flyback switch power supply controlled by hysteresis loop

Also Published As

Publication number Publication date
JP2541132B2 (en) 1996-10-09

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