JPS6111436B2 - - Google Patents
Info
- Publication number
- JPS6111436B2 JPS6111436B2 JP55130916A JP13091680A JPS6111436B2 JP S6111436 B2 JPS6111436 B2 JP S6111436B2 JP 55130916 A JP55130916 A JP 55130916A JP 13091680 A JP13091680 A JP 13091680A JP S6111436 B2 JPS6111436 B2 JP S6111436B2
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- exposure lamp
- rectifier circuit
- lamp
- resistor
- 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
- 239000003990 capacitor Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000005669 field effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Description
【発明の詳細な説明】
本発明は複写機などに用いる露光ランプの調光
装置に関し、電源電圧が急激に変動しても、電源
の半周期毎に、露光ランプの両端の電圧の実効値
を、高精度に、遅れることなく一定に保つことに
より、電源電圧の変動に左右されることなく、露
光ランプが、設定した一定の明るさを保つことが
でき、複写機などにおいて、安定した鮮明な画像
が得られる露光ランプの調光装置を提供するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light control device for an exposure lamp used in a copying machine, etc., and is capable of adjusting the effective value of the voltage across the exposure lamp every half cycle of the power supply even if the power supply voltage fluctuates rapidly. By keeping the brightness constant with high precision and without delay, the exposure lamp can maintain the set brightness without being affected by fluctuations in the power supply voltage. The present invention provides a light control device for an exposure lamp with which an image can be obtained.
第１図は従来のこの種の露光ランプの調光装置
の電気回路を示している。第１図において、１は
交流電源、２は露光ランプ、３はサイリスタであ
り、このサイリスタ３により露光ランプ２が調光
される。４はスイツチ、５，６はサイリスタ３の
ゲートに接続された抵抗およびコンデンサ、７，
８は抵抗であり、この抵抗７，８の接続点にトリ
ガ素子９の一端が接続されている。１０，１１，
１２は時定数回路を構成するコンデンサおよび抵
抗、１３は抵抗、１４，１５はツエナーダイオー
ドであり、逆極性に設けられている。 FIG. 1 shows an electric circuit of a conventional dimmer device for an exposure lamp of this type. In FIG. 1, 1 is an AC power supply, 2 is an exposure lamp, and 3 is a thyristor, and the exposure lamp 2 is dimmed by this thyristor 3. 4 is a switch, 5 and 6 are resistors and capacitors connected to the gate of thyristor 3, 7,
8 is a resistor, and one end of a trigger element 9 is connected to the connection point between the resistors 7 and 8. 10, 11,
12 is a capacitor and a resistor constituting a time constant circuit, 13 is a resistor, and 14 and 15 are Zener diodes, which are provided with opposite polarities.
第１図に示す従来の調光装置は、第２図にも示
すように、半周期毎にＡ点の積分電圧と、電源電
圧に比例したＢ点の電圧とを比較しサイリスタ３
を制御する。すなわちＡ点がＢ点よりトリガ素子
９のトリガ電圧分高くなつた点がサイリスタ３の
導通角となり、サイリスタ３により露光ランプ２
が制御される。第２図の斜線部分が露光ランプ２
に加わる波形である。ランプ２の明るさの設定は
可変抵抗器１２により行なう。電源電圧ＶOが変
動した場合、それに応じてサイリスタ３の導通角
が制御されるが、この従来例では電源電圧が変動
した瞬間の半サイクルのランプ２の両端電圧は設
定値と異なる値となる欠点があつた。又この回路
では、電源電圧の変動に対するランプ両端の電圧
の安定度をよくすることに限界があり、また明る
さの設定が可変抵抗器の抵抗値のみであり、制御
電圧で制御できない欠点があつた。 As shown in FIG. 2, the conventional light control device shown in FIG.
control. In other words, the point where point A is higher than point B by the trigger voltage of the trigger element 9 becomes the conduction angle of the thyristor 3, and the thyristor 3 causes the exposure lamp 2 to
is controlled. The shaded area in Figure 2 is the exposure lamp 2.
This is the waveform added to. The brightness of the lamp 2 is set by a variable resistor 12. When the power supply voltage V O fluctuates, the conduction angle of the thyristor 3 is controlled accordingly, but in this conventional example, the voltage across the lamp 2 during the half cycle at the moment the power supply voltage fluctuates is a value different from the set value. There were flaws. In addition, this circuit has a limitation in improving the stability of the voltage across the lamp against fluctuations in the power supply voltage, and also has the drawback that the brightness can only be set by the resistance value of the variable resistor and cannot be controlled by the control voltage. Ta.
本発明は上記従来の欠点を除去するものであ
り、以下に本発明の一実施例について第３図、第
４図ａ，ｂ，ｃ，ｄとともに説明する。 The present invention eliminates the above-mentioned drawbacks of the conventional technology, and an embodiment of the present invention will be described below with reference to FIGS. 3, 4a, 4b, c, and d.
第３図において、２１は交流電源、２２は全波
整流回路、２３，２４，２５はそれぞれ全波整流
回路２２の出力回路に直列に接続された露光ラン
プ、トランジスタ、電流検出用抵抗であり、上記
トランジスタ２４により露光ランプ２３が制御さ
れる。２６，２７は全波整流回路２２の出力端と
アース間に直列接続された抵抗であり、この抵抗
２６，２７の接続点に抵抗２８を介して演算増幅
器２９の一方の入力端子が接続されている。また
全波整流回路２２の他端の端子に抵抗３０を介し
て演算増幅器２９の他方の入力端子が接続されて
いる。３１は演算増幅器２９の入出力端子間に接
続されたコンデンサ、３２はこのコンデンサ３１
に並列接続された電界効果型トランジスタ３３，
３４，３５は演算増幅器２９の出力端と、オープ
ンコレクタ電圧比較器３６の出力端との間に直列
接続された抵抗、ダイオード、抵抗である。３７
は演算増幅器２９の出力端に接続された抵抗であ
り、この抵抗３７と電圧比較器３６の出力端の間
にダイオード３８、抵抗３９が直列に接続されて
いる。上記電圧比較器３６の一方の入力端子には
＋ＶCCを抵抗４０，４１で分圧された電圧が印加
され、また他方の入力端子には全波整流回路２２
の出力電圧が抵抗４２，４３で分圧された電圧が
印加される。４４は電圧比較器３６の出力端と、
＋ＶCCとの間に接続された抵抗である。４５はオ
ープンコレクタ電圧比較器であり、この電圧比較
器４５の一方の入力端子には、露光ランプ２３の
明るさを設定する直流電圧ＶINが抵抗４６を介し
て印加される。４７，４８は電圧比較器４５の入
力出端子間に接続された抵抗、ダイオードであ
る。４９はトランジスタであり、このトランジス
タ４９のベースと電圧比較器４５の出力端との間
には抵抗５０が接続されている。５１はトランジ
スタ４９のエミツタ、ベース間に接続された抵
抗、５２は電源＋ＶCCに接続されたスイツチであ
る。５３はトランジスタ４９のコレクタとトラン
ジスタ５４のベース間に接続された抵抗、５５は
トランジスタ５４のベースとトランジスタ２４の
エミツタ間に接続された抵抗である。 In FIG. 3, 21 is an AC power supply, 22 is a full-wave rectifier circuit, and 23, 24, and 25 are an exposure lamp, a transistor, and a current detection resistor connected in series to the output circuit of the full-wave rectifier circuit 22, respectively. The exposure lamp 23 is controlled by the transistor 24. 26 and 27 are resistors connected in series between the output end of the full-wave rectifier circuit 22 and the ground, and one input terminal of an operational amplifier 29 is connected to the connection point of the resistors 26 and 27 via a resistor 28. There is. Further, the other input terminal of an operational amplifier 29 is connected to the other end terminal of the full-wave rectifier circuit 22 via a resistor 30. 31 is a capacitor connected between the input and output terminals of the operational amplifier 29, and 32 is this capacitor 31.
A field effect transistor 33 connected in parallel to
34 and 35 are resistors, diodes, and resistors connected in series between the output terminal of the operational amplifier 29 and the output terminal of the open collector voltage comparator 36. 37
is a resistor connected to the output terminal of the operational amplifier 29, and a diode 38 and a resistor 39 are connected in series between this resistor 37 and the output terminal of the voltage comparator 36. A voltage obtained by dividing +V CC by resistors 40 and 41 is applied to one input terminal of the voltage comparator 36, and the full-wave rectifier circuit 22 is applied to the other input terminal.
A voltage obtained by dividing the output voltage of is applied by resistors 42 and 43. 44 is the output terminal of the voltage comparator 36;
This is a resistor connected between +V CC and VCC. Reference numeral 45 denotes an open collector voltage comparator, and a DC voltage V IN that sets the brightness of the exposure lamp 23 is applied to one input terminal of the voltage comparator 45 via a resistor 46 . 47 and 48 are resistors and diodes connected between the input and output terminals of the voltage comparator 45. 49 is a transistor, and a resistor 50 is connected between the base of this transistor 49 and the output terminal of the voltage comparator 45. 51 is a resistor connected between the emitter and base of the transistor 49, and 52 is a switch connected to the power supply + Vcc . 53 is a resistor connected between the collector of transistor 49 and the base of transistor 54, and 55 is a resistor connected between the base of transistor 54 and the emitter of transistor 24.
第３図において、Ｄ点には電源電圧（全波整流
回路２２の出力電圧）に比例した電圧が生じ、ま
たＥ点には露光ランプ２３に流れる電流に比例し
た電圧が生じる。抵抗２８，３０、演算増幅器２
９、コンデンサ３１によつて、Ｄ点とＥ点との差
の電圧が積分され、Ａ点にはその積分電圧にＤ点
の電圧を加えた電圧が生じる。このＡ点の電圧
は、電源電圧の半周期毎の実効値積分電圧にほぼ
等しい。なお抵抗３３，３５、電界効果型トラン
ジスタ３２、ダイオード３４は、抵抗４２，４
３，４１，４０，４４、オープンコレクタ電圧比
較器３６により発生した、第４図Ｃに示すＢ点の
波形に同期して、電源電圧OV付近で積分電圧を
リセツトするための回路である。実効値積分電圧
が抵抗３７を通して、また露光ランプ３２の明る
さを設定する直流電圧ＶINが抵抗４６を通してオ
ープンコレクタ電圧比較器４５に加えられ、比較
され、Ａ点の電圧がＶINより低い時間だけ、Ｃ点
の電圧は第４図ｄのように、LOWレベルとな
り、スイツチ５２をオンすると抵抗５１，５２，
５３，５５に電流が流れ、トランジスタ４９，５
４は導通となりトランジスタ２４も導通状態とな
るので露光ランプ２３に第４図ａの斜線の電圧が
加わる。なお、抵抗３９、ダイオード３８は、積
分電圧リセツト時にトランジスタ２４をオフする
ための回路で、抵抗４７、ダイオード４８は、電
圧比較器４５にヒステリシスを持たせる回路であ
り、一旦Ｃ点のレベルがハイレベルになればダイ
オード４８の出力電圧が高くなり安定化するもの
である。第４図の点線のように電源電圧が変動し
た場合も、斜線の部分の実効値をフイードバツク
しているので、露光ランプ２３両端の電圧は半周
期毎の実効値が遅れることなく一定に保たれる。
なお露光ランプ２３に流れる電流を制限する必要
がない場合は抵抗２５をシヨートすればよい。こ
の場合はランプの電力を制御するのではなくて、
ランプに加わる実効電圧を制御することになる。 In FIG. 3, a voltage proportional to the power supply voltage (output voltage of the full-wave rectifier circuit 22) is generated at point D, and a voltage proportional to the current flowing through the exposure lamp 23 is generated at point E. Resistors 28, 30, operational amplifier 2
9. The capacitor 31 integrates the voltage difference between points D and E, and a voltage that is the sum of the integrated voltage and the voltage at point D is generated at point A. The voltage at point A is approximately equal to the effective value integrated voltage for each half cycle of the power supply voltage. Note that the resistors 33 and 35, the field effect transistor 32, and the diode 34 are replaced by the resistors 42 and 4.
3, 41, 40, 44 are circuits for resetting the integrated voltage near the power supply voltage OV in synchronization with the waveform at point B shown in FIG. 4C generated by the open collector voltage comparator 36. The effective value integrated voltage is applied to the open collector voltage comparator 45 through the resistor 37 and the DC voltage V IN that sets the brightness of the exposure lamp 32 is applied to the open collector voltage comparator 45 through the resistor 46 for comparison. , the voltage at point C becomes LOW level as shown in Figure 4d, and when switch 52 is turned on, resistors 51, 52,
Current flows through transistors 53 and 55, and transistors 49 and 5
4 becomes conductive, and the transistor 24 also becomes conductive, so that a voltage indicated by diagonal lines in FIG. 4a is applied to the exposure lamp 23. Note that the resistor 39 and diode 38 are a circuit for turning off the transistor 24 when resetting the integrated voltage, and the resistor 47 and diode 48 are a circuit for providing hysteresis to the voltage comparator 45, and once the level at point C is high, When the level is reached, the output voltage of the diode 48 becomes high and stabilized. Even when the power supply voltage fluctuates as shown by the dotted line in Figure 4, the effective value in the shaded area is fed back, so the voltage across the exposure lamp 23 is kept constant without delay in the effective value for each half cycle. It can be done.
Note that if there is no need to limit the current flowing through the exposure lamp 23, the resistor 25 may be shorted. In this case, rather than controlling the lamp power,
This will control the effective voltage applied to the lamp.
本発明は上記のような構成であり、半周期毎に
ランプ両端に実際に加わつた電圧を積分してフイ
ードバツクしているので、電源電圧の急激な変動
に対しても、遅れることなく、ランプ両端の電圧
を安定化でき、ランプ両端電圧の安定度が、従来
例に比べて向上し、またランプの明るさの設定を
直流電圧により行なうことができ、ランプ両端の
実効値電圧が設定電圧にほぼ比例するので、他回
路との接続が容易になるものである。又電圧のフ
イードバツクだけでなく、ランプに流れる電流も
含めたフイードバツクができるため、露光ランプ
の両端電圧の変動は、従来の方式に比べ小さくな
り、より安定した複写画像が得られる利点を有す
るものである。 The present invention has the above-described configuration, and since the voltage actually applied to both ends of the lamp is integrated and fed back every half cycle, even if the power supply voltage fluctuates rapidly, the voltage applied to both ends of the lamp is not delayed. The voltage across the lamp can be stabilized, and the stability of the voltage across the lamp is improved compared to conventional examples.Also, the brightness of the lamp can be set using DC voltage, and the effective value voltage across the lamp is almost equal to the set voltage. Since it is proportional, it is easy to connect with other circuits. In addition, since it is possible to provide not only voltage feedback but also feedback including the current flowing through the lamp, fluctuations in the voltage across the exposure lamp are smaller than with conventional methods, which has the advantage of producing more stable copied images. be.
第１図は従来の露光ランプの調光装置を示す回
路図、第２図は同回路の電源電圧の変動に対する
出力電圧波形を示す図、第３図は本発明の一実施
例における露光ランプの調光装置の回路図、第４
図ａ〜ｄは同回路の各部の電圧波形図である。
２１……交流電源、２２……全波整流回路、２
３……露光ランプ、２４……トランジスタ、２９
……演算増幅器、３６，４５……電圧比較器。
FIG. 1 is a circuit diagram showing a conventional exposure lamp dimmer, FIG. 2 is a diagram showing the output voltage waveform of the same circuit with respect to fluctuations in power supply voltage, and FIG. 3 is a circuit diagram showing an exposure lamp according to an embodiment of the present invention. Circuit diagram of dimmer device, 4th
Figures a to d are voltage waveform diagrams at various parts of the circuit. 21... AC power supply, 22... Full wave rectifier circuit, 2
3...Exposure lamp, 24...Transistor, 29
...Operation amplifier, 36, 45...Voltage comparator.
Claims (1)
ランプおよびスイツチング素子を直列接続し、上
記スイツチング素子で露光ランプを制御する露光
ランプの調光装置において、上記整流回路の出力
電圧に比例した電圧、又は整流回路の出力電圧に
比例した電圧に上記露光ランプに流れる電流に比
例した電圧を加えた電圧を積分し、この積分電圧
に、上記整流回路の出力電圧に比例した電圧を加
えてなる実効値積分電圧と、上明露光ランプの明
るさを設定する直流設定電圧とを上記整流回路の
出力電圧の半周期毎に比較し、上記実効値積分電
圧が上記直流設定電圧より小さい間だけ上記スイ
ツチング素子を導通させ上記露光ランプに電流を
流すことを特徴とする露光ランプの調光装置。1. In an exposure lamp dimmer device in which an exposure lamp and a switching element are connected in series to the output end of a rectifier circuit that rectifies an alternating current voltage, and the exposure lamp is controlled by the switching element, a voltage proportional to the output voltage of the rectifier circuit; Or an effective value obtained by integrating the voltage proportional to the output voltage of the rectifier circuit plus a voltage proportional to the current flowing through the exposure lamp, and adding a voltage proportional to the output voltage of the rectifier circuit to this integrated voltage. The integrated voltage and the DC set voltage for setting the brightness of the bright exposure lamp are compared every half cycle of the output voltage of the rectifier circuit, and the switching element is switched on only while the effective value integrated voltage is smaller than the DC set voltage. A light control device for an exposure lamp, characterized in that the exposure lamp is made conductive and current flows through the exposure lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55130916A JPS5755090A (en) | 1980-09-19 | 1980-09-19 | Dimmer for exposure lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55130916A JPS5755090A (en) | 1980-09-19 | 1980-09-19 | Dimmer for exposure lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5755090A JPS5755090A (en) | 1982-04-01 |
| JPS6111436B2 true JPS6111436B2 (en) | 1986-04-02 |
Family
ID=15045728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55130916A Granted JPS5755090A (en) | 1980-09-19 | 1980-09-19 | Dimmer for exposure lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5755090A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5918598A (en) * | 1982-07-20 | 1984-01-30 | キヤノン株式会社 | Light source controller for image forming device |
| JPH0541516Y2 (en) * | 1985-07-10 | 1993-10-20 |
-
1980
- 1980-09-19 JP JP55130916A patent/JPS5755090A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5755090A (en) | 1982-04-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4031458A (en) | A.C. voltage regulator employing thyristor | |
| US4219761A (en) | Incandescent lamp dimmer providing control voltage IES square law compliance correction | |
| JPS6111436B2 (en) | ||
| JPS59501040A (en) | proximity switch circuit | |
| JP2646646B2 (en) | Inrush current limiting circuit | |
| JPS613215A (en) | Integrable load voltage sampling circuit for effective value load average voltage controller | |
| JPH1167470A (en) | Dimming switch | |
| JPH0697810B2 (en) | AC control circuit | |
| JPH0713430Y2 (en) | Phase control circuit for AC power | |
| JPH02294269A (en) | Power supply device | |
| USRE26866E (en) | Phase controlled alternating current power circuits using_ bidirectional conducting devices | |
| RU2064197C1 (en) | Voltage stabilizer for alternating current | |
| JPS6117460Y2 (en) | ||
| KR850002617Y1 (en) | Constant voltage control circuit of exposure lamp in duplicator | |
| JP3282185B2 (en) | Power supply for halogen lamp | |
| JPH047668Y2 (en) | ||
| JPH0221602B2 (en) | ||
| JPH0221603B2 (en) | ||
| JPS5965326A (en) | Power supply adjusting circuit | |
| KR860003135Y1 (en) | Protecting circuit for emitting lamp of electronic copy machine | |
| JPS5841760Y2 (en) | automatic dimmer circuit | |
| JPS6015720A (en) | Low temperature compensating circuit | |
| JPS6139820A (en) | Overcurrent protecting circuit | |
| JPH0446071B2 (en) | ||
| JPS5919634B2 (en) | lamp voltage control circuit |