JPH05325910A - Noble gas electric discharge lamp device - Google Patents

Noble gas electric discharge lamp device

Info

Publication number
JPH05325910A
JPH05325910A JP12914092A JP12914092A JPH05325910A JP H05325910 A JPH05325910 A JP H05325910A JP 12914092 A JP12914092 A JP 12914092A JP 12914092 A JP12914092 A JP 12914092A JP H05325910 A JPH05325910 A JP H05325910A
Authority
JP
Japan
Prior art keywords
discharge lamp
wall
bulb
electrodes
rare gas
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
Application number
JP12914092A
Other languages
Japanese (ja)
Inventor
Seiichiro Fujioka
誠一郎 藤岡
Tsutomu Chikada
勉 近田
Katsuyuki Okimura
克行 沖村
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 Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
Nippon Electric Co 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 NEC Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP12914092A priority Critical patent/JPH05325910A/en
Publication of JPH05325910A publication Critical patent/JPH05325910A/en
Pending legal-status Critical Current

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  • Circuit Arrangements For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)

Abstract

PURPOSE:To restrain surface creepage on a bulb surface and miniaturize an electric discharge lamp device by fixing a phosphor layer on the inner wall of a tubular glass bulb, sealing noble gas including mainly xenon(Xe) gas inside the bulb, attaching a pair of band-like electrodes to the outer wall of the bulb, and applying a high frequency voltage between the electrodes to light the lamp device. CONSTITUTION:A phosphor layer 3 is attached on the inner surface of a glass bulb 1, which is sealed with noble gas including mainly Xe gas. A pair of band- like electrodes 4, 5 each made of an aluminum foil are disposed on the outer wall of the bulb 2. A high frequency voltage of 50kHz or higher is applied to the electrodes 4, 5, thus lighting an electric discharge lamp device.

Description

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

【0001】[0001]

【産業上の利用分野】この発明は、内壁に蛍光体層を被
着した管状ガラスバルブの中に、キセノンガスを主成分
とする希ガスを封入し、該ガラスバルブの外壁に一対の
帯状電極を配設し、両帯状電極間に高周波,高電圧を印
加して点灯するようにした希ガス放電灯装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular glass bulb whose inner wall is coated with a phosphor layer, in which a rare gas containing xenon gas as a main component is sealed, and a pair of strip electrodes are provided on the outer wall of the glass bulb. The present invention relates to a rare gas discharge lamp device in which a high frequency and a high voltage are applied between both strip electrodes so as to light.

【0002】[0002]

【従来の技術】この種ガラスバルブの外壁に一対の帯状
電極を配設した、所謂外壁電極型希ガス放電灯1は、図
3に示すように、例えば外径6mm程度の細長ガラスバ
ルブ2の内面に蛍光体層3を被着し、内部にキセノンガ
スを主成分とする希ガスを30torr〜100tor
rのガス圧で封入し、該ガラスバルブ2の外壁に、アル
ミ箔からなる一対の帯状電極4、5をバルブ軸の略全長
に亘ってに対向して配設した構造を有している。かかる
構造の希ガス放電灯1は、図2に示すような、商用周波
の電源6をインバ−タなどの高周波点灯回路7により、
例えば20〜30KHz、2KV程度の高周波、高電圧
に変換して、両帯状電極4、5間に印加すると、両帯状
電極4、5間に挟まれたガラスバルブ2の内部空間に、
バルブ軸と直交した方向にキセノンガスの放電(励起線
波長147nm)を生じる。そして、このキセノンガス
の放電によりガラスバルブ2の内壁に被着された蛍光体
層3が励起され、その可視光がバルブ2の外方に放射さ
れるのである。かかる構造の希ガス放電灯1は、バルブ
径が細く、希ガス放電であるため、明るさや、放電電圧
が周囲温度に殆ど影響されない、バルブ内に電極がない
ため、寿命が長いなどの特徴があり、近時OA機器の原
稿読取り用光源などに注目されている。
2. Description of the Related Art A so-called outer wall electrode type rare gas discharge lamp 1 in which a pair of strip electrodes are arranged on the outer wall of a glass bulb of this type is shown in FIG. The phosphor layer 3 is deposited on the inner surface, and a rare gas containing xenon gas as a main component is added therein at 30 torr to 100 torr.
The glass bulb 2 is sealed with a gas pressure of r and a pair of strip electrodes 4 and 5 made of aluminum foil are arranged on the outer wall of the glass bulb 2 so as to face each other over substantially the entire length of the bulb shaft. In the rare gas discharge lamp 1 having such a structure, as shown in FIG. 2, a commercial frequency power source 6 is provided by a high frequency lighting circuit 7 such as an inverter.
For example, when converted into a high frequency and high voltage of about 20 to 30 KHz and 2 KV and applied between the strip electrodes 4 and 5, the internal space of the glass bulb 2 sandwiched between the strip electrodes 4 and 5,
Discharge of the xenon gas (excitation line wavelength 147 nm) is generated in the direction orthogonal to the valve axis. Then, the discharge of the xenon gas excites the phosphor layer 3 attached to the inner wall of the glass bulb 2, and the visible light is emitted to the outside of the bulb 2. The rare gas discharge lamp 1 having such a structure is characterized in that the bulb diameter is small and the discharge is rare gas, so that the brightness and the discharge voltage are hardly affected by the ambient temperature, and that the bulb has no electrode and thus has a long life. In recent years, attention has been focused on a light source for reading originals of OA equipment.

【0003】[0003]

【発明が解決しようとする課題】ところで、このように
優れた特徴を有している外壁電極型希ガス放電灯1は、
何分内部の放電空間にガラスバルブ2を介して両帯状電
極4、5より高周波の高電圧が印加されるものであり、
放電維持に1700V〜1800V(RMS)という高
いランプ電圧が必要であった。このため、高周波点灯回
路7のインバ−タ装置に高電圧のトランスを要し、出力
端子部の絶縁破壊や、希ガス放電灯1自体の外壁電極
4、5間のガラスバルブ2の表面で、沿面放電を生じる
などの問題があった。従って、高周波点灯回路7に高い
絶縁性が要求されて高価となり、かつ、これの回路基板
や、希ガス放電灯1のガラスバルブ径に大きいものが要
求され、装置の小型化が出来にくいものであった。
By the way, the outer wall electrode type rare gas discharge lamp 1 having such excellent features is as follows.
A high-frequency high voltage is applied to the internal discharge space via the glass bulb 2 from the two strip electrodes 4 and 5,
A high lamp voltage of 1700 V to 1800 V (RMS) was required to maintain the discharge. Therefore, a high-voltage transformer is required for the inverter device of the high-frequency lighting circuit 7, dielectric breakdown of the output terminal portion, the surface of the glass bulb 2 between the outer wall electrodes 4 and 5 of the rare gas discharge lamp 1 itself, There were problems such as creeping discharge. Therefore, the high-frequency lighting circuit 7 is required to have high insulation and becomes expensive, and the circuit board of the high-frequency lighting circuit 7 and the glass bulb diameter of the rare gas discharge lamp 1 are required to be large, which makes it difficult to downsize the device. there were.

【0004】したがって、本発明は上記に鑑みてなされ
たものであり、高周波点灯回路の絶縁保護や装置の小型
化が達成される希ガス放電灯装置を得ることを目的とし
ている。
Therefore, the present invention has been made in view of the above, and an object thereof is to obtain a rare gas discharge lamp device which can achieve insulation protection of a high frequency lighting circuit and downsizing of the device.

【0005】[0005]

【課題を解決するための手段】このため、本発明者等は
鋭意検討した結果、本発明の外壁電極型希ガス放電灯の
内部空間にはガラスバルブ壁を介して両外壁電極より高
周波電圧が印加されること、従って、バルブ内の放電に
はガラスバルブの肉厚方向の抵抗分と両電極間のガラス
バルブを介した空間で形成される静電容量分の加算され
たインピ−ダンスがかかること、そして、前記静電容量
分は印加する電源の点灯周波数により変化することに着
目し、本希ガス放電灯をより低い動作電圧で点灯駆動で
きないかと考えた。そして、ランプ電流を所定の一定値
に維持した状態で、点灯周波数を従来の20〜30KH
zの範囲から100KHzに亘って変化させ、点灯周波
数に対するランプの動作電圧の変化を調査した。その結
果、ランプ電圧は最初点灯周波数の増加と共に、従来の
千数百ボルトから数百ボルトへと急激に低下していくこ
と、その後、点灯周波数が50KHzを越えると殆ど低
下せず、ランプ電圧は略平衡状態に達することを見出だ
した。従って、本発明は上記放電特性の調査結果に基ず
き、外壁電極型希ガス放電灯を周波数50KHz以上の
高周波点灯回路で点灯するようにしたものである。
Therefore, as a result of intensive studies by the present inventors, a high frequency voltage is applied to the inner space of the outer wall electrode type rare gas discharge lamp of the present invention through the glass bulb wall from both outer wall electrodes. As a result, the resistance in the thickness direction of the glass bulb and the electrostatic capacitance formed in the space between the two electrodes through the glass bulb add impedance to the discharge in the bulb. Then, paying attention to the fact that the electrostatic capacitance changes depending on the lighting frequency of the power source to be applied, it was wondered whether the present rare gas discharge lamp could be driven for lighting at a lower operating voltage. Then, with the lamp current maintained at a predetermined constant value, the lighting frequency is set to the conventional 20 to 30 KH.
The change in the operating voltage of the lamp with respect to the lighting frequency was investigated by changing the range from z to 100 KHz. As a result, the lamp voltage drastically decreases from the conventional voltage of several thousand to several hundred volts with the increase of the lighting frequency, and after that, when the lighting frequency exceeds 50 KHz, the lamp voltage hardly decreases, and the lamp voltage decreases. It was found that a nearly equilibrium state was reached. Therefore, according to the present invention, based on the result of the discharge characteristic investigation, the outer wall electrode type rare gas discharge lamp is lit by a high frequency lighting circuit having a frequency of 50 KHz or more.

【0006】[0006]

【作用】上記調査結果によれば、本発明の外壁電極型希
ガス放電灯は点灯周波数を50KHz以上に設定するこ
とで、ランプ電流を所定の一定値に維持し、ランプ電圧
を数百ボルトと略最低の点灯電圧で点灯駆動することが
できる。この場合、希ガス放電灯はランプ電流を所定の
一定値に維持するため、ランプ照度は略所定の明るさが
維持される。尚、本発明において、ランプの動作電圧が
当初、点灯周波数と共に減少することは、両電極間のガ
ラスバルブを介した空間で形成される静電容量分が周波
数の増加とともに1/jwCで減少するためであり、そ
の後、略平衡に達することは、50KHzを越えるとガ
ラスバルブの肉厚方向の抵抗分が周波数の増加と共に増
加して、全体としてのインピ−ダンスが略平衡に達する
ためと推察される。
According to the above investigation results, the outer wall electrode type rare gas discharge lamp of the present invention maintains the lamp current at a predetermined constant value and sets the lamp voltage to several hundred volts by setting the lighting frequency to 50 KHz or more. Lighting can be driven with a substantially minimum lighting voltage. In this case, since the rare gas discharge lamp maintains the lamp current at a predetermined constant value, the lamp illuminance maintains a substantially predetermined brightness. In the present invention, the fact that the operating voltage of the lamp initially decreases with the lighting frequency means that the electrostatic capacitance formed in the space between the electrodes via the glass bulb decreases with 1 / jwC as the frequency increases. This is because the resistance in the thickness direction of the glass bulb increases with an increase in frequency when the frequency exceeds 50 KHz, and the impedance as a whole reaches approximately equilibrium. It

【0007】[0007]

【実施例】以下、本発明の一実施例を図面を参照して説
明する。図1は本発明に係る外壁電極型希ガス放電灯1
のランプ電流を一定に保った時の点灯周波数とランプ電
圧との相関関係図を示している。ここで、上記希ガス放
電灯1は、図3と同構造のものであり、ガラスバルブ2
は外径6mm,肉厚0.5mm,長さ300mmの鉛ガ
ラスが、封入ガスはキセノンガス65torrが,外壁
電極4、5は幅6mm,長さ300mmのアルミ箔が用
いられた。そして、両外壁電極4、5に、図4に示すよ
うな高周波点灯回路7が接続され、特性試験がなされ
た。試験はランプ電流がそれぞれ20mA,25mAの
一定になるよう電源電圧を調整し、点灯周波数を20K
Hz〜100KHzの範囲で5KHzステップで可変さ
せ、その時のランプ電圧を測定して、夫々図示するよう
な特性曲線A1,A2を得た。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an outer wall electrode type rare gas discharge lamp 1 according to the present invention.
The correlation diagram between the lighting frequency and the lamp voltage when the lamp current is kept constant is shown. Here, the rare gas discharge lamp 1 has the same structure as that of FIG.
Is a lead glass having an outer diameter of 6 mm, a wall thickness of 0.5 mm and a length of 300 mm, a filling gas is xenon gas of 65 torr, and outer wall electrodes 4 and 5 are an aluminum foil having a width of 6 mm and a length of 300 mm. Then, a high frequency lighting circuit 7 as shown in FIG. 4 was connected to both outer wall electrodes 4 and 5, and a characteristic test was conducted. In the test, the power supply voltage was adjusted so that the lamp current was constant at 20 mA and 25 mA, and the lighting frequency was 20K.
In the range of Hz to 100 KHz, the voltage was varied in 5 KHz steps, the lamp voltage at that time was measured, and characteristic curves A1 and A2 as shown in the drawing were obtained.

【0008】同図から明らかなように、ランプ電流25
mAの曲線A1はランプ電流20mAの曲線A2のもの
に比べて約500V程度高い上方に位置しているが、両
曲線A1,A2とも、50KHzまでは点灯周波数の増
加と共にランプ電圧が、それぞれ1600V,2100
Vから600V,750V程度までへと急激に低下して
おり、その後、ランプ電圧は点灯周波数を増加してもさ
ほど低下せず、略平衡状態になっている。尚、本試験に
於いて、両曲線A1,A2とも、点灯周波数20KHz
以下では放電にチラツキを生じ、不安定となった。
As is clear from the figure, the lamp current 25
The curve A1 of mA is located about 500 V higher than that of the curve A2 of lamp current 20 mA, but both curves A1 and A2 have a lamp voltage of 1600 V, respectively, as the lighting frequency increases up to 50 KHz. 2100
The voltage drastically decreases from V to about 600V and 750V, and thereafter, the lamp voltage does not decrease so much even if the lighting frequency is increased and is in a substantially balanced state. In this test, both curves A1 and A2 had a lighting frequency of 20 KHz.
In the following, flickering occurred in the discharge and it became unstable.

【0009】図2は上記特性試験において、各バルブの
中央部外壁より8mmはなれた位置で測定した照度曲線
デ−タであり、照度曲線B1,B2はそれぞれランプ電
流を20mA,25mAのものに対応している。両曲線
B1,B2は点灯周波数の増加と共にその照度値が若干
低下するものの、実用範囲( LX)以上あり、特
に実使用で問題となるものではない。
FIG. 2 shows illuminance curve data measured at a position 8 mm away from the outer wall of the central portion of each bulb in the above characteristic test. Illuminance curves B1 and B2 correspond to lamp currents of 20 mA and 25 mA, respectively. is doing. Although the illuminance values of the curves B1 and B2 slightly decrease with the increase of the lighting frequency, they are in the practical range (LX) or more, and there is no particular problem in actual use.

【0010】[0010]

【発明の効果】以上詳述したように、本発明は管状ガラ
スバルブの内壁に蛍光体層を被着し、内部にキセノンガ
スを主成分とする希ガスを封入し、該ガラスバルブの外
壁に一対の帯状電極を添設し、両帯状電極間に高周波圧
を印加して点灯するようにした希ガス放電灯装置におい
て、前記一対の帯状電極間に、50KHz以上の高周
波、高電圧を印加して希ガス放電灯を点灯するように構
成したから、照度をさほど低下することなくランプ電圧
を低下することができ、高周波電源装置や希ガス放電灯
装置の絶縁性の問題が解消され、装置の小型化や低廉化
に対処することができる。
As described in detail above, according to the present invention, a phosphor layer is deposited on the inner wall of a tubular glass bulb, and a rare gas containing xenon gas as a main component is sealed inside, and the outer wall of the glass bulb is sealed. In a rare gas discharge lamp device in which a pair of strip-shaped electrodes are additionally provided and a high-frequency pressure is applied between both strip-shaped electrodes for lighting, a high frequency of 50 KHz or higher and a high voltage are applied between the pair of strip-shaped electrodes. Since the rare gas discharge lamp is configured to light up, the lamp voltage can be lowered without significantly lowering the illuminance, and the problem of insulation of the high frequency power supply device and the rare gas discharge lamp device is solved, It is possible to deal with miniaturization and cost reduction.

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

【図1】本発明の外壁電極型希ガス放電灯の特性曲線図
である。
FIG. 1 is a characteristic curve diagram of an outer wall electrode type rare gas discharge lamp of the present invention.

【図2】本発明の外壁電極型希ガス放電灯の照度曲線図
である。
FIG. 2 is an illuminance curve diagram of an outer wall electrode type rare gas discharge lamp of the present invention.

【図3】本発明が適用される外壁電極型希ガス放電灯の
一部破断断面図である。
FIG. 3 is a partially cutaway sectional view of an outer wall electrode type rare gas discharge lamp to which the present invention is applied.

【図4】図3の放電灯の高周波点灯回路である。FIG. 4 is a high frequency lighting circuit of the discharge lamp of FIG.

【符号の説明】[Explanation of symbols]

1 希ガス放電灯 2 ガラスバルブ 3 蛍光体層 4、5 帯状電極 1 Noble gas discharge lamp 2 Glass bulb 3 Phosphor layer 4, 5 Strip electrodes

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 管状ガラスバルブの内壁に蛍光体層を被
着し、内部にキセノンガスを主成分とする希ガスを封入
し、該ガラスバルブの外壁に一対の帯状電極を添設し、
両帯状電極間に高周波電圧を印加して点灯するようにし
た希ガス放電灯装置において、前記一対の帯状電極間
に、50KHz以上の高周波電圧を印加することを特徴
とする希ガス放電灯装置
1. A phosphor layer is deposited on the inner wall of a tubular glass bulb, a rare gas containing xenon gas as a main component is enclosed therein, and a pair of strip electrodes are attached to the outer wall of the glass bulb.
In a rare gas discharge lamp device in which a high frequency voltage is applied between both strip electrodes to turn on, a high frequency voltage of 50 KHz or more is applied between the pair of strip electrodes.
JP12914092A 1992-05-21 1992-05-21 Noble gas electric discharge lamp device Pending JPH05325910A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12914092A JPH05325910A (en) 1992-05-21 1992-05-21 Noble gas electric discharge lamp device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12914092A JPH05325910A (en) 1992-05-21 1992-05-21 Noble gas electric discharge lamp device

Publications (1)

Publication Number Publication Date
JPH05325910A true JPH05325910A (en) 1993-12-10

Family

ID=15002113

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12914092A Pending JPH05325910A (en) 1992-05-21 1992-05-21 Noble gas electric discharge lamp device

Country Status (1)

Country Link
JP (1) JPH05325910A (en)

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