JPS6282700A - Dimmer of fluorescent lamp for indicator - Google Patents
Dimmer of fluorescent lamp for indicatorInfo
- Publication number
- JPS6282700A JPS6282700A JP60223367A JP22336785A JPS6282700A JP S6282700 A JPS6282700 A JP S6282700A JP 60223367 A JP60223367 A JP 60223367A JP 22336785 A JP22336785 A JP 22336785A JP S6282700 A JPS6282700 A JP S6282700A
- Authority
- JP
- Japan
- Prior art keywords
- heater
- voltage
- fluorescent lamp
- transformer
- lighting
- 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
- Liquid Crystal (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
「産業上の利用分野」
液晶表示パネルの背面に光を照射して、その液晶表示パ
ネルの表示が見えるようにされたものがある。この発明
はこのように表示器に対する光源として螢光灯を用いる
場合に、その螢光灯から放射する光量を、！Ｊ！節して
表示輝度を調整するための調光器に閏する。DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" There is a device in which the back surface of a liquid crystal display panel is irradiated with light to make the display on the liquid crystal display panel visible. In this way, when a fluorescent lamp is used as a light source for a display device, the present invention calculates the amount of light emitted from the fluorescent lamp! J! Use a dimmer to adjust display brightness.
「従来の技術」
従来においては、光源としての螢光灯や次陰極管は、全
点灯状態とされ、液晶表示パネルの液晶印加電圧を調節
して表示輝度の調節（３Ｉ！光）を行っていた。しかし
このような調光方法では液晶表示のコントラストが低下
してしまい、大幅な調光を良好な表示状態で行うことが
できなかった。"Prior Art" Conventionally, the fluorescent lamps and secondary cathode tubes used as light sources were kept fully lit, and the display brightness was adjusted by adjusting the voltage applied to the liquid crystal of the liquid crystal display panel (3I! light). Ta. However, such a dimming method lowers the contrast of the liquid crystal display, making it impossible to perform significant dimming with good display conditions.
またサイリスクにより螢光灯に印加される交流電圧の流
通角を制御して調光を行う方法もある。There is also a method of dimming the fluorescent lamp by controlling the flow angle of the AC voltage applied to the fluorescent lamp using Cyrisk.
この方法は、光度が全点灯の１０％以下になると不安定
であり、消灯してしまう欠点があった。This method has the drawback that it is unstable and the lights go out when the luminous intensity becomes less than 10% of the total lighting.
この発明の目的は良好な表示状態を維持し、かつ／７い
調光状態でもげ実りこ点灯状帳とすることができる螢光
灯の調光器を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a dimmer for a fluorescent lamp that maintains a good display state and can be used in a dimming state even in a low dimming state.
「問題点を解決するための手段」
この発明によれば、螢光灯に電離用電極が設けられ、こ
の電離用電極に所定値以上の高電圧を与えて管内のガス
を電離させることができるようにされ、ヒータトランス
に二つのヒータ用２次巻線が設＋、ｌられ、そのヒータ
用２次巻線は螢光灯両端のヒータにそれぞれ接続される
と共に、このヒータトランスでは高圧用２次巻線が設け
られ、その高圧用２次巻線はＴＬ電離用電極接続される
。ヒータトランスの１次側にはヒータ用交流電源からほ
ぼ一定振幅の交流電圧が印加される。必要に応してこの
交流電圧は安定化回路により安定に保持される。このヒ
ータ用交流電圧をヒータトランスに印加しただＬｊで、
螢光灯は管内の水銀蒸気が電離し、微小な発光状態にな
る。"Means for Solving the Problem" According to the present invention, a fluorescent lamp is provided with an ionizing electrode, and a high voltage of a predetermined value or higher is applied to the ionizing electrode to ionize the gas in the tube. The heater transformer is equipped with two heater secondary windings, and the heater transformer is connected to the heaters at both ends of the fluorescent lamp. A secondary winding is provided, and the high voltage secondary winding is connected to the TL ionization electrode. An alternating current voltage of approximately constant amplitude is applied to the primary side of the heater transformer from an alternating current power supply for the heater. This alternating current voltage is maintained stably by a stabilizing circuit as required. When this heater AC voltage is applied to the heater transformer, at Lj,
In a fluorescent lamp, the mercury vapor inside the tube ionizes, creating a tiny luminescence state.
一方、螢光灯の両端間に点灯用トランスが接続され、そ
の点灯用トランスの一次側に調光用交流電源が接続され
る。調光用交流電源の周波数は、ヒータ用交流電源の周
波数よりも低く、かつ振幅を’ＡＭできるようにされる
。On the other hand, a lighting transformer is connected between both ends of the fluorescent lamp, and a dimming AC power source is connected to the primary side of the lighting transformer. The frequency of the alternating current power source for dimming is lower than the frequency of the alternating current power source for the heater, and the amplitude can be adjusted to AM.
「実施例」
第１図はこの発明による表示器用型光灯の調光器の実施
例を説明する。出射光量が調整されるべき螢光灯１１は
両端にそれぞれヒータ１２，１３を備えている。この発
明では螢光灯１１に電離用電極１４が例えば管壁の外面
にその長手方向に沿って設けられる。螢光灯１１の両端
、っまりヒータ１２，１３の各一端間に点灯用トランス
１５の２次側の両端が接続される。点灯用トランス１５
の１次側の両端間に調光用交流電源１６が接続される。Embodiment FIG. 1 describes an embodiment of a dimmer for a display lamp according to the present invention. A fluorescent lamp 11 whose output light quantity is to be adjusted is provided with heaters 12 and 13 at both ends, respectively. In the present invention, the fluorescent lamp 11 is provided with an ionizing electrode 14, for example, on the outer surface of the tube wall along its longitudinal direction. Both ends of a lighting transformer 15 on the secondary side are connected between both ends of the fluorescent lamp 11 and one end of each of the coil heaters 12 and 13. Lighting transformer 15
A dimming AC power source 16 is connected between both ends of the primary side.
調光用交流電；１１１１６は例えばデユティ５０％の方
形波の交流電圧が出力され、その振幅を調整することが
できるものである。例えば点灯用トランス１５の１次側
の一端と接地との間に可変直流電源１７が接続され、可
変直２ｉｔ電源１７はその出力向／ｌ！ｔ？Ｔｉ圧をゼ
ロより変化さ−Ｕることができるものである。点灯用ト
ランス１５の１次側の他端はスイッチ素子としてのＦＥ
Ｔ１８を１ｆｆｌじて接地され、Ｆ ［Ｅ Ｔ １８の
ゲー１−に発振器１９からデユティ５０％の方形波出力
が供給され、ＦＥＴ１８がオンオフ制御される。発振器
１９の発振周波数ｆ。The dimming AC voltage 11116 outputs, for example, a square wave AC voltage with a duty of 50%, and its amplitude can be adjusted. For example, a variable DC power supply 17 is connected between one end of the primary side of the lighting transformer 15 and the ground, and the variable DC 2IT power supply 17 has an output direction of /l! T? It is possible to change the Ti pressure from zero. The other end of the primary side of the lighting transformer 15 is an FE as a switch element.
T18 is grounded through 1 ffl, and a square wave output with a duty of 50% is supplied from the oscillator 19 to the gate 1- of F[E T 18, and the FET 18 is controlled to be turned on and off. Oscillation frequency f of the oscillator 19.
は例えば２０ｋｌｌｚ とされる。is, for example, 20kllz.
このようにして可変直流？ｉｌｔｍ１７の出力電圧がオ
ンオフされた交流電圧が点灯用トランス１５に印加され
、そのトランス１５の２次側出力が点灯用交流電力とし
て螢光灯１１の両端に印加される。Variable DC in this way? An alternating current voltage obtained by turning on and off the output voltage of the iltm 17 is applied to the lighting transformer 15, and the secondary output of the transformer 15 is applied to both ends of the fluorescent lamp 11 as lighting alternating current power.
またヒータトランス２１が設けられ、ヒータトランス２
１は二つのヒータ用２次巻＆’Ｘ２２．２３と高圧用２
次巻線２４とを備え、ヒータ用２次巻線２２はヒータ１
２の両端に接続され、その点灯用トランス１５の２次巻
線と接続された一端は接地されている。ヒータ用２次巻
線２３は点灯用交、流電力がヒータトランス２１側・＼
入力されるのを１ｌＩＩ ′４１１１するコンデンサ２
５を通じてヒータ１３の両端に接続される。高圧用２次
巻線２４の一端は電離用７！：Ｌ極１４に接続され、他
端は接地される。ヒータトランス２１の１次側にはヒー
タ用交流ＴＬ源２６が接続され、ヒータ用交流電源２６
から一定電圧の交流電圧がヒータＩ・ランス２１へ供給
される。Further, a heater transformer 21 is provided.
1 is the secondary winding for two heaters &'X22.23 and 2 for high pressure
The secondary winding 22 for the heater is provided with a secondary winding 24 for the heater 1.
One end connected to the secondary winding of the lighting transformer 15 is grounded. The secondary winding 23 for the heater is connected to the heater transformer 21 side, where the AC and current power for lighting is connected to the heater transformer 21 side.
Capacitor 2 that inputs 1lII '4111
5 to both ends of the heater 13. One end of the high voltage secondary winding 24 is for ionization 7! : Connected to the L pole 14, and the other end is grounded. A heater AC TL source 26 is connected to the primary side of the heater transformer 21.
A constant alternating current voltage is supplied to the heater I lance 21 from the heater I lance 21 .
ヒータ用交流電ｔＸ２６は例えばヒータ１−ランス２１
の１次側の一端はヒータ用直流電源２７が接続され、他
端はスイッチ素子としてのＦＥＴ２８を通じて接地され
る。ＦＩＥＴ２８のゲー！〜に発頭器２９の出力が印加
され、ＦＥＴ２８は周波数ｆ２例えば１００ｋｌｌｚで
オンオフ制御され、つまりヒータ用直流電源２７の直流
出力電圧が、発振器２９の出力周波数で断続され、ヒー
タトランス２１に交流電圧が印加される。必要に応じて
ヒータ１２のヒータ電圧が電圧安定化回路３１に入力さ
れ、電圧安定化回路３１はその電圧を一定に保ｔ、Ｙす
るように、発振器２９の出力パルス幅を福制御する。The heater AC power tX26 is, for example, the heater 1-lance 21.
One end of the primary side is connected to a heater DC power supply 27, and the other end is grounded through an FET 28 as a switch element. FIET28 game! The output of the generator 29 is applied to ~, and the FET 28 is controlled on and off at a frequency f2 of, for example, 100 kllz. In other words, the DC output voltage of the heater DC power supply 27 is intermittent at the output frequency of the oscillator 29, and the AC voltage is applied to the heater transformer 21. is applied. The heater voltage of the heater 12 is input to the voltage stabilizing circuit 31 as necessary, and the voltage stabilizing circuit 31 controls the output pulse width of the oscillator 29 so as to keep the voltage constant.
皇−１
図に示してない起動スイッチをオンにしてヒー夕用直流
電源２７の出力をヒータトランス２１へ供給すると、電
圧安定化回路３Ｉがヒータ電圧を検出し、その電圧が所
定値になるように、ＦＥＴ２８のオン区間を変化させる
。螢光汀１１の両端のヒータ１２．１３に安定したヒー
タ電流が流れ、このヒータ（陰極）が赤熱され、熱・Ｕ
られた陰極から発生した熱電子は、電離用電極１４に印
加された高電圧により吸引され、螢光灯１１の管内の水
ｉｆｆ蒸気が電離さυ°られる。この時螢光灯１１は微
小な発光状態どなり、その輝度は全点灯時の４００分の
１（０，２５％）となり、かなり深い調光状態となる。Empress-1 When the starting switch (not shown in the figure) is turned on and the output of the heater DC power supply 27 is supplied to the heater transformer 21, the voltage stabilizing circuit 3I detects the heater voltage and adjusts the voltage to a predetermined value. Then, the ON period of FET 28 is changed. A stable heater current flows through the heaters 12 and 13 at both ends of the fluorescent tube 11, and this heater (cathode) becomes red-hot, producing heat and U.
The thermoelectrons generated from the cathode are attracted by the high voltage applied to the ionizing electrode 14, and the water vapor in the tube of the fluorescent lamp 11 is ionized υ°. At this time, the fluorescent lamp 11 enters a minute light emitting state, and its brightness becomes 1/400 (0.25%) of the fully lit state, resulting in a considerably deep dimming state.
この発光は安定したものである。なおヒータトランス２
１に対する交流電圧の周波数は例えば１００ｋｌｌｚ
という高周波であり、その効率は８０％以上の高いもの
が得られる。This light emission is stable. Furthermore, heater transformer 2
For example, the frequency of AC voltage for 1 is 100kllz
This is a high frequency, and the efficiency can be as high as 80% or more.
このように微小発光状態になった後に、点灯用トランス
１５へ供給する点灯電圧を上昇さきてゆくと、点灯用ト
ランス１５の２次側電圧によって螢光灯１１に管電流が
流れ、螢光灯１１を全点灯（１００％）まで発光輝度を
上げる。When the lighting voltage supplied to the lighting transformer 15 is increased after the light emission state is in this manner, a tube current flows through the fluorescent lamp 11 due to the secondary voltage of the lighting transformer 15, and the fluorescent lamp 11, increase the luminance until it is fully lit (100%).
ヒータの発振器２つの電流周波数ｆ２を点灯用交流電圧
の発振周波数！、に対し十分高くし、点灯用交流電圧を
低くしても、常に水銀イオンの電離状態が保持されるよ
うにすることにより、点灯用交流電圧が低い場合でも安
定に動作し、その電圧に応した輝度が得られる。The current frequency f2 of the two heater oscillators is the oscillation frequency of the AC voltage for lighting! By setting the mercury ion to a sufficiently high level so that the ionized state of mercury ions is always maintained even when the AC voltage for lighting is low, the system will operate stably even when the AC voltage for lighting is low and will respond to that voltage. You can get the brightness that you want.
「発明の効果」
以上述べたようにこの発明によれば、全点灯状態ｃｉｏ
ｏ％）から、微小発光状態（Ｏ１２５％）までを、例え
ば第２図に示すように点灯電圧■？を制御′Ｂすること
により、連続的に発光輝度を変化させることができ、し
かも低輝度においても安定な光が得られる。またこの発
明の調光器では、その調光範囲の何れのレベルについて
も、電源をオンにした後に、直ちにその状態に安定化さ
せることができ、一旦全点灯状態にした後に、所望のレ
ベルに下げるような操作は不要である。"Effects of the Invention" As described above, according to the present invention, the fully lit state cio
o%) to a minute light emission state (O125%), for example, as shown in Figure 2, the lighting voltage ■? By controlling 'B', it is possible to continuously change the luminance of the emitted light, and moreover, stable light can be obtained even at low luminance. In addition, with the dimmer of the present invention, any level within the dimming range can be stabilized immediately after the power is turned on, and once the dimmer is fully lit, it can be stabilized at the desired level. There is no need to perform any lowering operations.
第１図はこの発明による表示器用型光灯の調光器の実施
例を示す図、第２図はその点灯電圧と調光レベルとの関
係例を示す図である。
１１：螢光灯、ｉｚ、ｔ３：ヒータ、１４：電離用電極
、１５：点灯用トランス、】６：点灯用交流電源、Ｉ９
：発Ｈ器、２１：ヒータトランス、２２．２３：ヒータ
用２次巻線、２４：高圧用２次巻線、２９：発振器、３
１：電圧安定化回路。
特許出願人：口本航空電子工業株式会社代 理 人
： 草 野 卓オ ２ 図FIG. 1 is a diagram showing an embodiment of a dimmer for a display type light lamp according to the present invention, and FIG. 2 is a diagram showing an example of the relationship between the lighting voltage and the dimming level. 11: Fluorescent lamp, iz, t3: Heater, 14: Electrode for ionization, 15: Transformer for lighting, ] 6: AC power supply for lighting, I9
: Generator, 21: Heater transformer, 22.23: Secondary winding for heater, 24: Secondary winding for high voltage, 29: Oscillator, 3
1: Voltage stabilization circuit. Patent applicant: Kuchimoto Aviation Electronics Industry Co., Ltd. Agent: Takuo Kusano 2 Figure
Claims (1)
の螢光灯よりの放射光量を調整して表示輝度を調節する
調光器において、 上記螢光灯の両端ヒータ内に２次側が接続された点灯用
トランスと、 その点灯用トランスの１次側と接続され、これに交流電
圧を印加し、かつその交流電圧を調整することができる
調光用交流電源と、 上記螢光灯に設けられた電離用電極と、 上記螢光灯の両端のヒータにそれぞれ接続された二つの
ヒータ用２次巻線と、上記電離用電極及び一方のヒータ
間に接続された高圧用２次巻線とを有するヒータトラン
スと、 そのヒータトランスの１次側に接続され、上記調光用交
流電源の交流電圧よりも高い周波数の交流電源をヒータ
トランスの１次側へ印加するヒータ用交流電源とを具備
する表示器用螢光灯の調光器。(1) In a dimmer that uses a fluorescent lamp as a light source for the display and adjusts the display brightness by adjusting the amount of light emitted from the fluorescent lamp, the secondary side is connected to heaters at both ends of the fluorescent lamp. a lighting transformer, a dimming AC power supply connected to the primary side of the lighting transformer, capable of applying an AC voltage thereto and adjusting the AC voltage; two heater secondary windings connected to heaters at both ends of the fluorescent lamp; and a high voltage secondary winding connected between the ionization electrode and one of the heaters. and an AC power source for a heater that is connected to the primary side of the heater transformer and applies an AC power source with a higher frequency than the AC voltage of the dimming AC power source to the primary side of the heater transformer. A dimmer for fluorescent lights for display devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60223367A JPS6282700A (en) | 1985-10-07 | 1985-10-07 | Dimmer of fluorescent lamp for indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60223367A JPS6282700A (en) | 1985-10-07 | 1985-10-07 | Dimmer of fluorescent lamp for indicator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6282700A true JPS6282700A (en) | 1987-04-16 |
Family
ID=16797031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60223367A Pending JPS6282700A (en) | 1985-10-07 | 1985-10-07 | Dimmer of fluorescent lamp for indicator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6282700A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63318524A (en) * | 1987-06-23 | 1988-12-27 | Ushio Inc | System for lighting liquid crystal display part |
-
1985
- 1985-10-07 JP JP60223367A patent/JPS6282700A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63318524A (en) * | 1987-06-23 | 1988-12-27 | Ushio Inc | System for lighting liquid crystal display part |
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