JPH0547482A - Noble gas discharge lamp device - Google Patents
Noble gas discharge lamp deviceInfo
- Publication number
- JPH0547482A JPH0547482A JP22634191A JP22634191A JPH0547482A JP H0547482 A JPH0547482 A JP H0547482A JP 22634191 A JP22634191 A JP 22634191A JP 22634191 A JP22634191 A JP 22634191A JP H0547482 A JPH0547482 A JP H0547482A
- Authority
- JP
- Japan
- Prior art keywords
- preheating
- frequency
- lighting
- inverter
- discharge lamp
- 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
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明はファクシミリ、イメー
ジリーダ等の情報機器に使用される希ガス放電ランプを
点灯させる装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for lighting a rare gas discharge lamp used in information equipment such as facsimiles and image readers.
【0002】[0002]
【従来の技術】近年、ファクシミリ、イメージリーダ等
の情報機器に用いられる原稿読取用光源として、希ガス
の紫外線発光や可視の発光を利用した放電ランプが用い
られるようになってきた。特に、冷陰極の希ガス放電ラ
ンプは、既に広く用いられている。また、熱陰極の希ガ
ス放電ランプも、低点灯電源、高輝度等の点から、注目
され始めている。2. Description of the Related Art In recent years, as a light source for reading an original used in information devices such as a facsimile and an image reader, a discharge lamp utilizing ultraviolet light emission of visible light or visible light emission has come to be used. In particular, cold cathode rare gas discharge lamps have already been widely used. Also, hot cathode rare gas discharge lamps have begun to be noticed in terms of low lighting power source, high brightness, and the like.
【0003】しかし、熱陰極の放電ランプを点灯するた
めには、冷陰極の放電ランプと違い、熱陰極を予熱する
ための回路が必要となる。通常よく使われている高周波
インバータの場合、回路の簡素化のため、単に放電灯の
始動と同時に予熱ができるように、予熱電源は点灯回路
の昇圧変圧器の二次側から取っている。しかし、一般に
情報機器では、放電の安定化や電極消耗防止のために、
点灯回路と予熱回路を独立させて、個別に制御できるよ
うにし、放電ランプの始動前に予熱を行なえるようにな
っているものが多い。However, in order to light a hot cathode discharge lamp, a circuit for preheating the hot cathode is required, unlike a cold cathode discharge lamp. In the case of a commonly used high-frequency inverter, in order to simplify the circuit, the preheating power source is taken from the secondary side of the step-up transformer of the lighting circuit so that preheating can be performed at the same time as starting the discharge lamp. However, in general, in information equipment, in order to stabilize discharge and prevent electrode consumption,
In many cases, the lighting circuit and the preheating circuit are independent and can be individually controlled, so that the preheating can be performed before starting the discharge lamp.
【0004】図6は例えば特開昭57−84596号公
報に示された従来の放電ランプ装置を示す回路図であ
る。図において、1は蛍光ランプからなる放電ランプ、
2A,2Bは放電ランプ1に封入されたフィラメント電
極,3A,3Bは電極2A,2Bに接続された直流予熱
電源、4は電極2A,2B間に接続されたインバータ、
5は100V商用電源である。FIG. 6 is a circuit diagram showing a conventional discharge lamp device disclosed in, for example, Japanese Patent Laid-Open No. 57-84596. In the figure, 1 is a discharge lamp consisting of a fluorescent lamp,
2A and 2B are filament electrodes enclosed in the discharge lamp 1, 3A and 3B are DC preheating power sources connected to the electrodes 2A and 2B, and 4 is an inverter connected between the electrodes 2A and 2B,
5 is a 100V commercial power supply.
【0005】従来の放電ランプ装置は上記のように構成
され、点灯回路と予熱回路が独立しているため、情報機
器本体からの制御により、予熱回路をあらかじめ作動さ
せておいてから、放電を開始させることができる。放電
ランプ1が水銀を使用した、いわゆる蛍光ランプの場合
は、放電ランプ1の保温のために、電源5の投入中は、
常時予熱を行なうようにしている。しかし、希ガスだけ
を使用した放電ランプの場合は、点灯と同時に安定した
輝度が得られるため、常時予熱する必要はない。Since the conventional discharge lamp device is constructed as described above and the lighting circuit and the preheating circuit are independent, the preheating circuit is preliminarily operated by the control of the information equipment body, and then the discharge is started. Can be made In the case where the discharge lamp 1 is a so-called fluorescent lamp using mercury, in order to keep the temperature of the discharge lamp 1, while the power source 5 is turned on,
I always try to preheat. However, in the case of a discharge lamp using only a rare gas, stable brightness is obtained at the same time as lighting, and thus it is not necessary to always preheat.
【0006】予熱電源3A,3Bを商用電源5から得る
場合は、簡単な整流回路によって構成できるが、通常情
報機器内部で使用されている電源は直流12V、24V
等の直流電源である。そこで、これらの電源から必要な
電圧(通常3〜4V)を得るためには、直流電源から高
周波交流を得る。つまり点灯回路と同様に、予熱回路に
もインバータを使用するのが通常である。When the preheating power sources 3A and 3B are obtained from the commercial power source 5, they can be constituted by a simple rectifying circuit, but the power sources normally used inside the information equipment are DC 12V and 24V.
Etc. is a DC power supply. Therefore, in order to obtain a required voltage (usually 3 to 4 V) from these power supplies, a high frequency alternating current is obtained from a DC power supply. That is, like the lighting circuit, it is usual to use an inverter for the preheating circuit.
【0007】[0007]
【発明が解決しようとする課題】上記のような点灯回路
及び予熱回路にインバータを使用した放電ランプ装置で
は、自励発振式インバータの場合、発振周波数は回路素
子によって決まるため、点灯回路のインバータの発振周
波数と予熱回路のインバータの発振周波数は別々の値と
なる。予熱周波数が点灯周波数に近いか、又は低い場合
は、連続点灯の場合、合成された波形は点灯波形がゆっ
くりと波打ったような状態となり、その結果、放電ラン
プ1の発光波形もゆっくり変動する。In the discharge lamp device using the inverter for the lighting circuit and the preheating circuit as described above, in the case of the self-excited oscillation type inverter, the oscillation frequency is determined by the circuit element. The oscillation frequency and the oscillation frequency of the inverter of the preheating circuit have different values. When the preheating frequency is close to or lower than the lighting frequency, in the case of continuous lighting, the combined waveform becomes a state where the lighting waveform is slowly wavy, and as a result, the light emission waveform of the discharge lamp 1 also fluctuates slowly. ..
【0008】また、線順次読取方式の高速なオン・オフ
を行なう点灯方式の場合、予熱周波数が点灯周波数より
も低いと、陰極の状態が不安定になり、始動電圧が激し
く変動し、それに伴って発光波形も激しく揺れ動くた
め、高い輝度安定性を要求される読取用光源としては使
用できなくなるという問題点がある。この対策として
は、図6に示すように、予熱電源3A,3Bを再び直流
に直せば、このような変動は発生しないが、そのために
は、予熱回路のインバータの先に、更に整流回路を接続
しなければならず、コスト高となり、大形化するという
問題点がある。Further, in the case of a lighting method for performing high-speed on / off of the line-sequential reading method, if the preheating frequency is lower than the lighting frequency, the state of the cathode becomes unstable and the starting voltage fluctuates drastically. As a result, the light emission waveform also fluctuates violently, so that it cannot be used as a reading light source that requires high luminance stability. As a measure against this, as shown in FIG. 6, if the preheating power sources 3A and 3B are converted to direct current again, such a fluctuation does not occur, but for that purpose, a rectification circuit is further connected before the inverter of the preheating circuit. However, there is a problem that the cost becomes high and the size becomes large.
【0009】この発明は上記問題点を解決するためにな
されたもので、放電ランプの発光の照度変動が少なく、
安価かつ小形に構成できるようにした希ガス放電ランプ
装置を提供することを目的とする。The present invention has been made to solve the above-mentioned problems, and there is little fluctuation in the illuminance of the light emitted from the discharge lamp.
It is an object of the present invention to provide a rare gas discharge lamp device which is inexpensive and can be made compact.
【0010】[0010]
【課題を解決するための手段】この発明に係る希ガス放
電ランプ装置は、希ガス放電ランプの熱陰極の予熱電源
の周波数を、点灯電源の周波数の2倍以上に設定したも
のである。In the rare gas discharge lamp device according to the present invention, the frequency of the preheating power source for the hot cathode of the rare gas discharge lamp is set to be at least twice the frequency of the lighting power source.
【0011】[0011]
【作用】この発明においては、予熱電源の周波数を点灯
電源の周波数の2倍以上に設定したため、放電陽光柱が
予熱波形の変動に追随できず安定した状態を保つ。In the present invention, since the frequency of the preheating power source is set to be twice or more the frequency of the lighting power source, the discharge positive column cannot keep up with the fluctuation of the preheating waveform and maintains a stable state.
【0012】[0012]
実施例1.図1〜図4はこの発明の一実施例を示す図
で、図1は回路図、図2は連続点灯時の輝度変動説明
図、図3は間欠点灯時の輝度変動説明図、図4は輝度変
動率曲線図であり、従来装置と同様の部分は同一符号で
示す。Example 1. 1 to 4 are views showing an embodiment of the present invention, FIG. 1 is a circuit diagram, FIG. 2 is an explanatory view of luminance fluctuation during continuous lighting, FIG. 3 is an explanatory view of luminance fluctuation during intermittent lighting, and FIG. It is a luminance variation curve diagram, and the same portions as those of the conventional device are denoted by the same reference numerals.
【0013】図1において、11は希ガス蛍光ランプで
あり、内面には蛍光体が塗布され、内部にキセノンガス
が17Torr封入されている。点灯用インバータ4の
点灯周波数は22kHzになっており、放電を安定化さ
せるための電流制限素子12を介して希ガス蛍光ランプ
11に接続されている。13は予熱用インバータで、予
熱周波数は50kHzに設定され、電極2A,2Bに接
続されている。14は点灯スイッチ、15は予熱スイッ
チであり、共に外部の制御系によってオン・オフされる
ようになっている。16はインバータ4,13に電源を
供給する24V直流電源である。In FIG. 1, reference numeral 11 denotes a rare gas fluorescent lamp, the inner surface of which is coated with a phosphor, and the interior of which is filled with 17 Torr of xenon gas. The lighting frequency of the lighting inverter 4 is 22 kHz, and it is connected to the rare gas fluorescent lamp 11 via the current limiting element 12 for stabilizing the discharge. Reference numeral 13 is a preheating inverter, which has a preheating frequency set to 50 kHz and is connected to the electrodes 2A and 2B. Reference numeral 14 is a lighting switch, and 15 is a preheating switch, both of which are turned on / off by an external control system. Reference numeral 16 is a 24V DC power supply that supplies power to the inverters 4 and 13.
【0014】次に、この実施例の動作を図2及び図3を
参照して説明する。外部の制御系によって予熱スイッチ
15がオンになると、予熱用インバータ13が作動し、
熱陰極2A,2Bが予熱される。次に、点灯スイッチ1
4がオンになると、点灯用インバータ4が作動し、希ガ
ス蛍光ランプ11が点灯する。このとき、予熱用インバ
ータ13の発振周波数は50kHz、点灯用インバータ
4の周波数は22kHzとなっているため、点灯波形は
予熱の影響を受けず、輝度の変動は小さい。Next, the operation of this embodiment will be described with reference to FIGS. When the preheating switch 15 is turned on by an external control system, the preheating inverter 13 operates,
The hot cathodes 2A and 2B are preheated. Next, lighting switch 1
When the switch 4 is turned on, the lighting inverter 4 is activated and the rare gas fluorescent lamp 11 is turned on. At this time, since the oscillation frequency of the preheating inverter 13 is 50 kHz and the frequency of the lighting inverter 4 is 22 kHz, the lighting waveform is not affected by the preheating and the fluctuation of the luminance is small.
【0015】読取用光源として使用した場合の安定性を
調べるために、1ラインを読み取る時間内に、受光素子
(図示しない)が受けると予想される光出力の積分値の
変動を図1に示す装置と、従来の予熱周波数を特に規定
していない装置について測定した結果を図2及び図3に
示す。読取時間は5ミリ秒と想定した。なお、従来装置
の予熱周波数は20kHzであった。In order to investigate the stability when used as a reading light source, FIG. 1 shows the fluctuation of the integrated value of the optical output expected to be received by the light receiving element (not shown) within the time for reading one line. 2 and 3 show the measurement results of the apparatus and the conventional apparatus in which the preheating frequency is not particularly specified. The read time was assumed to be 5 ms. The preheating frequency of the conventional device was 20 kHz.
【0016】図2は連続点灯の場合の変動を表したもの
で、図2(A)は上記実施例の結果、図2(B)は従来
装置の結果である。これによると、従来装置の光出力の
積分値は、少しではあるがゆっくりと波打っていること
が分かる。これに対して、上記実施例の積分値は、輝度
の変動が小さいため、そのような波は発生せず、常に一
定の大きさを保っている。2A and 2B show fluctuations in the case of continuous lighting. FIG. 2A shows the result of the above embodiment and FIG. 2B shows the result of the conventional device. According to this, it can be seen that the integrated value of the optical output of the conventional device is slightly wavy. On the other hand, the integrated value of the above-mentioned embodiment does not generate such a wave because the fluctuation of the luminance is small, and always keeps a constant magnitude.
【0017】図3は間欠点灯の場合の変動を表したもの
で、図3(A)は上記実施例の結果、図3(B)は従来
装置の結果である。間欠点灯は2ミリ秒オン、3ミリ秒
オフの繰返しとした。これによると、従来装置の光出力
の積分値は激しく変動しているのに対して、上記実施例
の積分値は、安定していることが分かる。3A and 3B show fluctuations in the case of intermittent lighting. FIG. 3A shows the result of the above embodiment and FIG. 3B shows the result of the conventional device. The intermittent lighting was repeated for 2 ms on and 3 ms off. According to this, it can be seen that the integrated value of the optical output of the conventional device fluctuates drastically, whereas the integrated value of the above-mentioned embodiment is stable.
【0018】図4は点灯周波数22kHzのインバータ
を使用した間欠点灯において、予熱周波数を変化させた
場合の輝度の変動率を測定した結果である。予熱周波数
が低いときは、変動率は10%程度であるが、予熱周波
数が点灯周波数の約2倍に近付くに従って、変動率は急
激に低下し、2倍以上で約3%になっているのが分か
る。FIG. 4 shows the results of measuring the rate of change in luminance when the preheating frequency was changed in intermittent lighting using an inverter with a lighting frequency of 22 kHz. When the preheating frequency is low, the fluctuation rate is about 10%, but as the preheating frequency approaches approximately twice the lighting frequency, the fluctuation rate sharply decreases, and when it is more than doubled, it becomes approximately 3%. I understand.
【0019】実施例2.図5はこの発明の他の実施例を
示す回路図であり、希ガス蛍光ランプ11には棒状陽極
18及び熱陰極2Bが封入されており、希ガス蛍光ラン
プ11と並列にダイオード19が接続されている。これ
で、希ガス蛍光ランプ11に印加される電圧は半波整流
電圧になる。これは一種の直流パルスであるため、電極
の一方、常に陽極となる側はフィラメント電極である必
要はなく、棒状電極18でよい。このように片側にだけ
熱陰極2Bがあり、点灯波形が直流パルスの場合も、同
様に予熱周波数を点灯周波数の2倍にすることによって
輝度の安定化が図れる。Example 2. FIG. 5 is a circuit diagram showing another embodiment of the present invention. The rare gas fluorescent lamp 11 has a rod-shaped anode 18 and a hot cathode 2B enclosed therein, and a diode 19 is connected in parallel with the rare gas fluorescent lamp 11. ing. Thus, the voltage applied to the rare gas fluorescent lamp 11 becomes a half-wave rectified voltage. Since this is a kind of DC pulse, one of the electrodes, the side which is always the anode, does not have to be the filament electrode, but may be the rod electrode 18. Thus, even when the hot cathode 2B is provided on only one side and the lighting waveform is a DC pulse, the brightness can be stabilized by similarly setting the preheating frequency to twice the lighting frequency.
【0020】上記各実施例では、希ガス蛍光ランプ11
はキセノンガスを封入するものとしたが、その他の希ガ
ス又は希ガスの混合ガスを封入した希ガス蛍光ランプ
や、ネオン放電管のような内面に蛍光体を塗布しない放
電ランプにおいても、同様の効果が期待できる。In each of the above embodiments, the rare gas fluorescent lamp 11 is used.
Is the xenon gas, but the same applies to other rare gas fluorescent lamps filled with a rare gas or a mixed gas of rare gases and a discharge lamp such as a neon discharge tube in which no phosphor is applied to the inner surface. You can expect an effect.
【0021】[0021]
【発明の効果】以上説明したとおりこの発明では、希ガ
ス放電ランプの熱陰極の予熱電源の周波数を、点灯電源
の周波数の2倍以上に設定したので、放電陽光柱が予熱
波形の変動に追随できず安定した状態を保ち、輝度変動
を少なくし、安価かつ小形に構成できる効果がある。As described above, in the present invention, the frequency of the preheating power source for the hot cathode of the rare gas discharge lamp is set to be twice or more the frequency of the lighting power source, so that the discharge positive column follows the fluctuation of the preheating waveform. It is possible to maintain a stable state without being able to do so, to reduce fluctuations in luminance, and to provide an inexpensive and compact structure.
【図1】この発明の実施例1を示す回路図。FIG. 1 is a circuit diagram showing a first embodiment of the present invention.
【図2】この実施例(A)及び従来例(B)の希ガス蛍光ラ
ンプの連続点灯時の輝度変動説明図。FIG. 2 is an explanatory view of luminance fluctuations during continuous lighting of the rare gas fluorescent lamps of the example (A) and the conventional example (B).
【図3】この実施例(A)及び従来例(B)の希ガス蛍光ラ
ンプの間欠点灯時の輝度変動説明図。FIG. 3 is an explanatory view of luminance fluctuation during intermittent lighting of the rare gas fluorescent lamps of this embodiment (A) and the conventional example (B).
【図4】希ガス蛍光ランプの輝度変動曲線図。FIG. 4 is a luminance variation curve diagram of a rare gas fluorescent lamp.
【図5】この発明の実施例2を示す回路図。FIG. 5 is a circuit diagram showing a second embodiment of the present invention.
【図6】従来の放電ランプ装置を示す回路図。FIG. 6 is a circuit diagram showing a conventional discharge lamp device.
2A,2B 熱陰極 4 点灯電源(点灯用インバータ) 11 放電ランプ(希ガス蛍光ランプ) 13 予熱電源(予熱用インバータ) 2A, 2B Hot cathode 4 Lighting power supply (lighting inverter) 11 Discharge lamp (rare gas fluorescent lamp) 13 Preheating power supply (preheating inverter)
Claims (1)
が熱陰極で構成された一対の電極を有する放電ランプ
と、上記放電ランプの電極間に高周波電圧を印加する点
灯電源と、上記放電ランプの熱陰極を予熱する予熱電源
からなる希ガス放電ランプ装置において、上記予熱電源
の周波数を上記点灯電源の周波数の2倍以上に設定した
ことを特徴とする希ガス放電ランプ装置。1. A discharge lamp having a pair of electrodes in which a rare gas is enclosed and at least one of which is a hot cathode, a lighting power supply for applying a high frequency voltage between the electrodes of the discharge lamp, and a discharge lamp of the discharge lamp. A rare gas discharge lamp device comprising a preheating power source for preheating a hot cathode, wherein the frequency of the preheating power source is set to be at least twice the frequency of the lighting power source.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22634191A JPH0547482A (en) | 1991-08-13 | 1991-08-13 | Noble gas discharge lamp device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22634191A JPH0547482A (en) | 1991-08-13 | 1991-08-13 | Noble gas discharge lamp device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0547482A true JPH0547482A (en) | 1993-02-26 |
Family
ID=16843653
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22634191A Pending JPH0547482A (en) | 1991-08-13 | 1991-08-13 | Noble gas discharge lamp device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0547482A (en) |
-
1991
- 1991-08-13 JP JP22634191A patent/JPH0547482A/en active Pending
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