JPS6330748B2 - - Google Patents

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Publication number
JPS6330748B2
JPS6330748B2 JP55127251A JP12725180A JPS6330748B2 JP S6330748 B2 JPS6330748 B2 JP S6330748B2 JP 55127251 A JP55127251 A JP 55127251A JP 12725180 A JP12725180 A JP 12725180A JP S6330748 B2 JPS6330748 B2 JP S6330748B2
Authority
JP
Japan
Prior art keywords
filament
voltage
circuit
current
constant voltage
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
Application number
JP55127251A
Other languages
Japanese (ja)
Other versions
JPS5753095A (en
Inventor
Mitsuo Shimada
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12725180A priority Critical patent/JPS5753095A/en
Publication of JPS5753095A publication Critical patent/JPS5753095A/en
Publication of JPS6330748B2 publication Critical patent/JPS6330748B2/ja
Granted legal-status Critical Current

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  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Description

【発明の詳細な説明】 本発明は熱陰極放電管の点灯回路に係り、特に
光度計の光源等に使用するに好適な熱陰極放電管
の点灯回路に関する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lighting circuit for a hot cathode discharge tube, and more particularly to a lighting circuit for a hot cathode discharge tube suitable for use as a light source of a photometer.

従来の熱陰極放電管のフイラメントは交流電圧
により加熱していたが、交流電圧では高安定度の
定電圧が得られないため輝度が変化する欠点があ
つた。またフイラメントを直流の高安定度の直流
定電圧を使用すると定電圧回路にも放電々流が流
れ定電圧電源に大容量のものが必要であるという
欠点があつた。
The filament of conventional hot cathode discharge tubes was heated by alternating current voltage, but this had the disadvantage that brightness varied because alternating current voltage did not provide a highly stable constant voltage. Furthermore, when a highly stable DC constant voltage is used for the filament, there is a drawback in that a constant voltage circuit also generates a discharge current, requiring a large capacity constant voltage power source.

第1図は従来の熱陰極放電管の点灯回路図であ
る。
FIG. 1 is a lighting circuit diagram of a conventional hot cathode discharge tube.

トランスTの2次側巻線N1の電圧e1は放電電
流用の電源であり、巻線N2の電圧e2はフイラメ
ントF加熱用の電源である。
The voltage e 1 of the secondary winding N 1 of the transformer T is a power source for the discharge current, and the voltage e 2 of the winding N 2 is a power source for heating the filament F.

スイツチS1が常時閉接点(以下NC接点とい
う)側のときは放電管1のフイラメントは交流電
圧e2で加熱される。また電圧e1は整流器D1により
整流され、コンデンサCに充電する。このときは
放電はしていないからコンデンサCには交流電圧
の波高値を充電する。
When the switch S1 is on the normally closed contact (hereinafter referred to as NC contact) side, the filament of the discharge tube 1 is heated by the alternating current voltage e2 . Further, the voltage e 1 is rectified by the rectifier D 1 and charges the capacitor C. At this time, there is no discharge, so the capacitor C is charged with the peak value of the AC voltage.

次に、スイツチS1を常時開接点(以下NO接点
という)側に切換ると放電々流はスイツチS1
NO接点を通り定電流回路2へ流れる。
Next, when switch S 1 is switched to the normally open contact (hereinafter referred to as NO contact) side, the discharge current is
The current flows through the NO contact to the constant current circuit 2.

スイツチS1は放電開始制御のスイツチと同時に
フイラメント電圧を変化するスイツチにもなつて
いる。スイツチS1がNO接点側に切換えると、交
流電圧e2は抵抗R1を介してフイラメント端子F1
F2に印加されるのでフイラメントFには放電を
維持するに必要な電圧が印加される。
The switch S1 serves as a switch for controlling the discharge start and at the same time as a switch for changing the filament voltage. When the switch S 1 switches to the NO contact side, the alternating current voltage e 2 passes through the resistor R 1 to the filament terminal F 1 ,
Since the voltage is applied to F 2 , a voltage necessary to maintain the discharge is applied to the filament F.

今ここで問題となるのはフイラメント電圧の安
定度である。フイラメント電圧が変動すれば輝度
が変り高精度の測光が行えない。
The issue here is the stability of the filament voltage. If the filament voltage fluctuates, the brightness will change and highly accurate photometry cannot be performed.

光度計の測光誤差を1×10-4Abs(吸光度)と
するには、輝度の定点度を2.4×10-4にしなけれ
ばならない。しかし交流の定電圧装置を用いても
安定度が1×10-3程度までしかできない。
In order to set the photometric error of the photometer to 1 x 10 -4 Abs (absorbance), the fixed point intensity of brightness must be 2.4 x 10 -4 . However, even if an AC voltage regulator is used, the stability can only be achieved up to about 1×10 -3 .

第2図は、フイラメントに定電圧装置を接続し
た従来の点灯回路の一例で、巻線N2の出力交流
電圧e2は整流器D2で整流され、定電圧回路3に
入り、定電圧回路3の出力電圧をフイラメント端
子F1,F2に印加して、フイラメントFを加熱す
るものである。フイラメント端子F1,F2にはそ
れぞれ正、負の電圧が印加されるものとする。
Figure 2 is an example of a conventional lighting circuit in which a voltage regulator is connected to the filament.The output AC voltage e2 of the winding N2 is rectified by the rectifier D2 , enters the constant voltage circuit 3, and is supplied to the constant voltage circuit 3. The filament F is heated by applying the output voltage to the filament terminals F 1 and F 2 . It is assumed that positive and negative voltages are applied to filament terminals F 1 and F 2 , respectively.

この動作は最初スイツチS1がNC接点のときは
定電圧回路3への入力電圧がそのままフイラメン
トFに印加される。
In this operation, when the switch S1 is initially in the NC contact, the input voltage to the constant voltage circuit 3 is directly applied to the filament F.

次に、スイツチS1をNO接点側に切換ると放電
が開始され、フイラメントFには、定電圧回路3
で制御された定電圧が印加される。
Next, switch S1 is switched to the NO contact side to start discharging, and filament F is connected to constant voltage circuit 3.
A constant voltage controlled by is applied.

そして放電々流は陽極Pからフイラメント端子
F1と、スイツチS1のNO接点を通り、定電流回路
2に入り、コンデンサCを通り陽極Pに戻るもの
と従来考えられていた。
And the discharge current flows from the anode P to the filament terminal.
It was conventionally thought that the current flows through F1 and the NO contact of switch S1 , enters constant current circuit 2, passes through capacitor C, and returns to anode P.

しかし、実験によれば、放電々流IFは第3図の
点線で示す如く、陽極Pからフイラメント端子
F2を通り、次に整流器D2を通り、トランスの巻
線N2を通り、再び整流器D2を通り、さらに定電
圧回路3の入力端INに入り、出力端OUTより出
てスイツチS1のNO接点を通り定電流回路2へと
流れ、コンデンサCを通り陽極Pに戻ることが分
かつた。
However, according to experiments, the discharge current I F flows from the anode P to the filament terminal, as shown by the dotted line in Figure 3.
F 2 , then rectifier D 2 , transformer winding N 2 , rectifier D 2 again, enters the input terminal IN of the constant voltage circuit 3, exits from the output terminal OUT, and switches to the switch S. It was found that the current flows through the NO contact of No. 1 to the constant current circuit 2, passes through the capacitor C, and returns to the anode P.

このような、放電々流のう回は、次の如き理由
で流れるものである。
This detour of the discharge current occurs for the following reasons.

フイラメント端子F1に正の電圧が、端子F2
負の電圧が印加されているとすると陽極Pとフイ
ラメント端子F1間の電圧よりは陽極Pとフイラ
メント端子F2間の電圧の方が大きい。従つて陽
極Pよりフイラメント端子F2へ放電々流が流れ
ることによる。
If a positive voltage is applied to filament terminal F 1 and a negative voltage is applied to terminal F 2 , the voltage between anode P and filament terminal F 2 is greater than the voltage between anode P and filament terminal F 1 . . Therefore, a current of discharge flows from the anode P to the filament terminal F2 .

以上の如くに定電圧回路3にも放電々流IPとフ
イラメント電流IFの和が流れるため、巻線N2
整流器D2、定電圧回路3に大電流の素子を使用
しなければならない欠点がある。
As mentioned above, since the sum of the discharge current I P and the filament current I F also flows in the constant voltage circuit 3, the winding N 2 ,
There is a drawback that large current elements must be used in the rectifier D 2 and the constant voltage circuit 3.

さらにまた、交流電圧が無安定化のときは放電
電流もその影響をうけ定電流特性が悪くなる欠点
があつた。
Furthermore, when the alternating current voltage is not stabilized, the discharge current is also affected and the constant current characteristics deteriorate.

本発明の目的は、放電々流を定電圧回路へは流
さないようにして定電圧電源を小形化すると同時
に輝度の安定化をはかつた熱陰極放電管の点灯回
路を提供するにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a lighting circuit for a hot cathode discharge tube that prevents a discharge current from flowing into a constant voltage circuit, thereby reducing the size of a constant voltage power supply and at the same time stabilizing the brightness.

本発明は、熱陰極放電のフイラメントに直流電
圧を印加するとき放電々流は陽極と電圧差の大き
い方のフイラメント端子側に電流が流れるという
実験結果に基づいて、フイラメントの負極性側に
放電々流回路を接続することにより、放電々流が
フイラメント用の定電圧回路をう回しないように
したものである。
The present invention is based on the experimental result that when a DC voltage is applied to the filament of hot cathode discharge, the discharge current flows to the filament terminal side which has a larger voltage difference from the anode. By connecting the current circuit, the discharge current does not bypass the constant voltage circuit for the filament.

第4図は本発明の一実施例を示す図である。 FIG. 4 is a diagram showing an embodiment of the present invention.

第4図の回路の内、第1図〜第3図と同じ引用
記号のものは同じものをさす。
In the circuit of FIG. 4, the same reference symbols as in FIGS. 1 to 3 refer to the same thing.

フイラメント端子F1には正の電圧が、端子F2
には負の電圧が印加される。フイラメント端子
F2は、スイツチS1の共通接点Cに接続されてい
る。スイツチS1のNC接点は、トランジスタQ、
抵抗R2およびR3で構成されるフイラメント電圧
可変回路へ接続され、NO接点は定電流回路2へ
接続されている。このフイラメント電圧可変回路
の動作は、スイツチS1がNC接点側にあるとき
は、トランジスタQにベース電流が流れ、トラン
ジスタQはONとなり定電圧回路3の入力端INと
出力端OUTを短絡し、フイラメントFには交流
電圧e2の整流したままの電圧が印加される。
Filament terminal F 1 has a positive voltage, terminal F 2
A negative voltage is applied to. filament terminal
F2 is connected to the common contact C of switch S1 . The NC contact of switch S1 is transistor Q,
It is connected to a filament voltage variable circuit composed of resistors R 2 and R 3 , and its NO contact is connected to a constant current circuit 2 . The operation of this filament voltage variable circuit is such that when switch S1 is on the NC contact side, base current flows through transistor Q, transistor Q is turned on, and short-circuits the input terminal IN and output terminal OUT of the constant voltage circuit 3. The rectified AC voltage e 2 is applied to the filament F.

次にスイツチS1をNO接点側にすると放電々流
に電圧差の大きいフイラメント端子F2へ流れ、
スイツチS1の共通接点C1およびNO接点を通り定
電流回路2へ流れ、定電圧回路3へう回するよう
なことはない。一方スイツチS1がNO接点側にな
ると、トランジスタQはベース電流が流れなくな
りOFF状態となるから定電圧回路3の出力電圧
がフイラメントFへ印加される。
Next, when switch S 1 is set to the NO contact side, the discharge current flows to filament terminal F 2 with a large voltage difference,
It flows through the common contact C1 and the NO contact of the switch S1 to the constant current circuit 2, and does not go around to the constant voltage circuit 3. On the other hand, when the switch S1 becomes the NO contact side, the base current no longer flows through the transistor Q and the transistor Q is turned off, so that the output voltage of the constant voltage circuit 3 is applied to the filament F.

従つてF1端子にはフイラメント電流IFが流れ、
F2端子にはフイラメント電流IFと放電々流IPの和
の電流が流れる。
Therefore, the filament current I F flows through the F1 terminal,
A current equal to the sum of the filament current I F and the discharge current I P flows through the F2 terminal.

本発明の一実施例によれば放電々流がフイラメ
ントを加熱する定電圧回路へう回することなく、
またフイラメントも高安定度の定電圧回路からの
出力電圧で加熱することができ安定した光を得る
ことができる。
According to an embodiment of the present invention, the electric discharge current is not diverted to the constant voltage circuit that heats the filament.
Furthermore, the filament can also be heated with the output voltage from a highly stable constant voltage circuit, making it possible to obtain stable light.

第5図は本発明の他の実施例を示すものであ
る。第4図と異なるのはスイツチS2が新たに設け
られていることである。スイツチS2によりフイラ
メント端子F1が整流器D2の+出力端子に接続さ
れ、スイツチS1とS2とは同時に切換動作するもの
とする。
FIG. 5 shows another embodiment of the invention. The difference from FIG. 4 is that switch S2 is newly provided. It is assumed that the filament terminal F 1 is connected to the + output terminal of the rectifier D 2 by the switch S 2 , and the switches S 1 and S 2 operate simultaneously.

スイツチS1およびS2がNC側にあるときはフイ
ラメントFには交流電圧e2を整流したままの電圧
が印加される。
When the switches S 1 and S 2 are on the NC side, the rectified AC voltage e 2 is applied to the filament F.

次にスイツチS1およびS2がNO側になると放
電々流IPはF2とスイツチS1を通り定電流回路2へ
入る。同時にフイラメント端子F1,F2には定電
圧回路3の出力電圧が印加される。このようにし
て放電々流のう回するのを防ぎかつフイラメント
を高安度で加熱することができるから安定した光
を得ることができる。
Next, when the switches S 1 and S 2 are set to the NO side, the discharge current I P passes through F 2 and the switch S 1 and enters the constant current circuit 2. At the same time, the output voltage of the constant voltage circuit 3 is applied to the filament terminals F 1 and F 2 . In this way, it is possible to prevent the discharge current from flowing around and to heat the filament at a high temperature, so that stable light can be obtained.

本発明によれば、放電々流をフイラメント電圧
回路へう回することなく定電流回路へすことがで
きるので安定な光を得ることができる。
According to the present invention, stable light can be obtained because the discharge current can be sent to the constant current circuit without being diverted to the filament voltage circuit.

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

第1図は従来の熱陰極放電管の点灯回路の図、
第2図は従来の他の熱陰極放電管の点灯回路図、
第3図は第2図の回路における放電々流のう回を
説明する図、第4図は本発明の一実施例を示す
図、第5図は本発明の他の実施例を示す図であ
る。 T……トランス、N1,N2……巻線、e1,e2
…交流電圧、D1,D2……整流器、C……コンデ
ンサ、1……熱陰極放電管、P……陽極、F……
フイラメント、F1,F2……フイラメント端子、
2……定電流回路、3……定電圧回路、S1,S2
…スイツチ、IP……放電々流、IF……フイラメン
ト電流。
Figure 1 is a diagram of the lighting circuit of a conventional hot cathode discharge tube.
Figure 2 is a lighting circuit diagram of another conventional hot cathode discharge tube.
FIG. 3 is a diagram explaining the detour of the discharge current in the circuit of FIG. 2, FIG. 4 is a diagram showing one embodiment of the present invention, and FIG. 5 is a diagram showing another embodiment of the present invention. be. T...transformer, N1 , N2 ...winding, e1 , e2 ...
...AC voltage, D 1 , D 2 ... Rectifier, C ... Capacitor, 1 ... Hot cathode discharge tube, P ... Anode, F ...
Filament, F 1 , F 2 ... filament terminal,
2... Constant current circuit, 3... Constant voltage circuit, S 1 , S 2 ...
...Switch, I P ...Discharge current, I F ...Filament current.

Claims (1)

【特許請求の範囲】[Claims] 1 陽極と第1、第2の2つの端子を有するフイ
ラメントからなる熱陰極放電管、前記第1、第2
の端子間に接続された定電圧回路、放電時前記定
電圧回路からの定電圧、予熱時前記定電圧回路を
介さない電圧を前記第1、第2の端子に印加する
手段、一方が前記陽極に接続され、他方が放電時
前記定電圧回路の負極性側に接続される定電流回
路から構成したことを特徴とする熱陰極放電管の
点灯回路。
1. A hot cathode discharge tube consisting of a filament having an anode and two terminals, a first and a second terminal;
a constant voltage circuit connected between the terminals of the anode, a means for applying a constant voltage from the constant voltage circuit during discharging, and a voltage not via the constant voltage circuit during preheating to the first and second terminals, one of which is connected to the anode; 1. A lighting circuit for a hot cathode discharge tube, comprising a constant current circuit, the other being connected to the negative polarity side of the constant voltage circuit during discharge.
JP12725180A 1980-09-16 1980-09-16 Circuit for firing hot-cathode discharge tube Granted JPS5753095A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12725180A JPS5753095A (en) 1980-09-16 1980-09-16 Circuit for firing hot-cathode discharge tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12725180A JPS5753095A (en) 1980-09-16 1980-09-16 Circuit for firing hot-cathode discharge tube

Publications (2)

Publication Number Publication Date
JPS5753095A JPS5753095A (en) 1982-03-29
JPS6330748B2 true JPS6330748B2 (en) 1988-06-20

Family

ID=14955422

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12725180A Granted JPS5753095A (en) 1980-09-16 1980-09-16 Circuit for firing hot-cathode discharge tube

Country Status (1)

Country Link
JP (1) JPS5753095A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5072472A (en) * 1973-10-31 1975-06-16

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5072472A (en) * 1973-10-31 1975-06-16

Also Published As

Publication number Publication date
JPS5753095A (en) 1982-03-29

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