JPH10255994A - Discharge lamp lighting method and illuminating system - Google Patents
Discharge lamp lighting method and illuminating systemInfo
- Publication number
- JPH10255994A JPH10255994A JP9052761A JP5276197A JPH10255994A JP H10255994 A JPH10255994 A JP H10255994A JP 9052761 A JP9052761 A JP 9052761A JP 5276197 A JP5276197 A JP 5276197A JP H10255994 A JPH10255994 A JP H10255994A
- Authority
- JP
- Japan
- Prior art keywords
- bulb
- discharge lamp
- lighting
- less
- khz
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052724 xenon Inorganic materials 0.000 claims abstract description 10
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011521 glass Substances 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 description 14
- 239000011248 coating agent Substances 0.000 description 12
- 238000000576 coating method Methods 0.000 description 12
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 241001621399 Lampris Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- DNNSSWSSYDEUBZ-UHFFFAOYSA-N krypton atom Chemical compound [Kr] DNNSSWSSYDEUBZ-UHFFFAOYSA-N 0.000 description 1
- 239000005355 lead glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000001579 optical reflectometry Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＯＡ機器などに多
用されている外部電極を有する冷陰極放電ランプの点灯
手段および冷陰極放電ランプと点灯回路装置とを備えた
照明装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device for a cold cathode discharge lamp having external electrodes, which is frequently used in OA equipment and the like, and an illumination device including the cold cathode discharge lamp and a lighting circuit device.
【０００２】[0002]
【従来の技術】一般の蛍光ランプは、ガラスバルブの内
面に蛍光体被膜を形成するとともにその両端部にコイル
状のフィラメントあるいは板状、円筒状や円柱状の冷陰
極などからなる電極を封装し、かつ、このバルブ内に低
圧の希ガスおよび必要に応じて水銀を封入している。2. Description of the Related Art A general fluorescent lamp has a phosphor film formed on an inner surface of a glass bulb and a coil-shaped filament or a plate-shaped, cylindrical or columnar cold cathode electrode sealed at both ends. The valve is filled with a low-pressure rare gas and, if necessary, mercury.
【０００３】しかし、このような構成のランプは、バル
ブ内に格別な電極が必要であり、またこの電極部を封装
するための気密構造を要するなど、部品点数が多く製造
が複雑で製造コストが高くなる。また、この内部電極は
ランプの寿命を左右する主因をなしているとともに電極
部が位置するバルブの端部からの発光量が低い。However, such a lamp requires a special electrode in the bulb, and requires a hermetic structure for sealing the electrode portion. For this reason, the number of parts is large, the production is complicated, and the production cost is high. Get higher. In addition, the internal electrode plays a major role in determining the life of the lamp, and the amount of light emitted from the end of the bulb where the electrode is located is low.
【０００４】このようなことから、内部電極に変え、バ
ルブ外面にバルブ軸に沿って帯状の外部電極を形成し、
これら外部電極間に高周波電力などを供給し、これによ
ってバルブ内に高周波放電を発生させ、希ガスを電離お
よび励起させて蛍光体を発光するようにした外部電極形
の蛍光ランプが提案されている。[0004] For this reason, instead of the internal electrode, a strip-shaped external electrode is formed on the outer surface of the valve along the valve axis.
An external electrode type fluorescent lamp has been proposed in which high-frequency power or the like is supplied between these external electrodes, thereby generating a high-frequency discharge in the bulb and ionizing and exciting a rare gas to emit a phosphor. .
【０００５】そして、この外部電極形のランプは、バル
ブ軸に沿って一対の帯状の電極が形成されるとともにバ
ルブ軸に沿って開口部（アパーチャ）を残して蛍光体被
膜が被着された、アパーチャ形をなしている。このよう
な構成のアパーチャ形の蛍光ランプは、蛍光体被膜の劣
化低減、バルブ温度の異常上昇の防止やバルブ端部まで
全体が発光できるなどのことがはかれ、安定した放電が
得られることによって十分な光量と光束低下の抑制、バ
ルブ軸方向に形成された開口部（アパーチャ）からは均
一な照度分布がなされる。In this external electrode type lamp, a pair of strip-shaped electrodes are formed along the bulb axis, and a phosphor coating is applied along the bulb axis leaving an opening (aperture). It has an aperture shape. The aperture-type fluorescent lamp with such a structure can reduce the deterioration of the phosphor coating, prevent abnormal rise of the bulb temperature, and emit light all the way to the bulb end. A sufficient amount of light and a reduction in luminous flux are suppressed, and a uniform illuminance distribution is made from an opening (aperture) formed in the valve axis direction.
【０００６】そして、この外部電極形の蛍光ランプは、
開口部（アパーチャ）から高効率の光放射が行われるこ
とから複写機、ファクシミリやイメージスキャナなどの
読取用の光源あるいは液晶表示装置のバックライトとし
て多用されている。This external electrode type fluorescent lamp is
Since light is emitted from an opening (aperture) with high efficiency, it is frequently used as a light source for reading such as a copying machine, a facsimile, an image scanner, or a backlight of a liquid crystal display device.
【０００７】[0007]
【発明が解決しようとする課題】近時、複写機やファク
シミリなどのＯＡ機器は、高性能化がすすむとともに小
形軽量化もはかられている。これに伴い放電ランプ側
も、バルブ外径が２ｍｍ程度と小形化されたものもあ
る。In recent years, OA equipment such as a copying machine and a facsimile has been improved in performance and reduced in size and weight. Along with this, the discharge lamp side is also downsized to have a bulb outer diameter of about 2 mm.
【０００８】一方、用途に応じては機器の小形軽量化よ
りも、より速い読取りや印刷後に高精度の再現性が得ら
れるよう、従来形程度の大きさの機器で高性能化がすす
められている。そして、これらの機器に用いられる放電
ランプに、始動時の立上り特性や輝度特性の向上が求め
られている。[0008] On the other hand, depending on the application, higher performance has been promoted in a device of a size similar to the conventional type so that higher accuracy reproducibility can be obtained after reading and printing faster than in reducing the size and weight of the device. I have. Further, the discharge lamps used in these devices are required to have improved startup characteristics and brightness characteristics at the time of starting.
【０００９】これら機器に用いられる放電ランプは、管
状のバルブ外径が約８ｍｍ、内径が７ｍｍ程度のもの
で、この放電ランプを正弦波交流で点灯すると、点灯時
間が経過するにしたがい輝度が低下し、たとえばファク
シミリの場合、始めと最終とでは印刷面に濃淡差が生じ
る不具合があった。また、バルブ内に水銀を封入したラ
ンプの場合、輝度の向上がはかれるが、水銀蒸気圧の関
係で立上り特性が悪いという問題があった。The discharge lamp used in these devices has a tubular bulb having an outer diameter of about 8 mm and an inner diameter of about 7 mm. When the discharge lamp is turned on with a sine wave alternating current, the brightness decreases as the lighting time elapses. However, for example, in the case of facsimile, there is a problem that a difference in shading occurs on the printing surface between the beginning and the end. Further, in the case of a lamp in which mercury is sealed in a bulb, the luminance can be improved, but there is a problem that the rising characteristics are poor due to the mercury vapor pressure.
【００１０】本発明は上記の事情に鑑みなされたもの
で、外径が約５．９ｍｍ以上、内径が５．１ｍｍ以上の
管状バルブの外面に電極を設けた低圧放電ランプを、高
輝度点灯する手段および照明装置を提供することを目的
とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a high-brightness lighting of a low-pressure discharge lamp having an electrode provided on the outer surface of a tubular bulb having an outer diameter of about 5.9 mm or more and an inner diameter of 5.1 mm or more. It is an object to provide means and a lighting device.
【００１１】[0011]
【課題を解決するための手段】本発明の請求項１に記載
の放電ランプの点灯方法は、内径５．１ｍｍ以上の管状
ガラスバルブの内面に蛍光体被膜を形成するとともにバ
ルブ内部にキセノンガスを含む希ガスを２００Ｔｏｒｒ
以下封入し、バルブ外面にバルブの管軸方向に沿って外
部電極を配設した冷陰極放電ランプを、周波数１０ＫＨ
Ｚ以上８０ＫＨＺ以下で、かつ、デューテイ比が２％以
上５０％以下のパルス波を印加して点灯することを特徴
とする。According to a first aspect of the present invention, there is provided a method for lighting a discharge lamp, comprising forming a phosphor film on an inner surface of a tubular glass bulb having an inner diameter of 5.1 mm or more and simultaneously supplying xenon gas inside the bulb. 200 Torr of rare gas containing
A cold cathode discharge lamp in which an external electrode is arranged along the bulb axis direction of the bulb on the outer surface of the bulb is enclosed at a frequency of 10 KH.
Lighting is performed by applying a pulse wave having a duty ratio of 2% to 50% in a range of Z to 80KHZ.
【００１２】放電ランプをパルス波で点灯すると、従来
の正弦波点灯時に比べてバルブ壁の温度上昇を低く抑え
ることができる。この放電ランプ点灯時の温度上昇はラ
ンプの消費電力（電圧×電流）に関係し、パルス波点灯
では正弦波点灯と同じ輝度ならば消費電力が少いので、
バルブ温度を低減できる。When the discharge lamp is lit by a pulse wave, the temperature rise of the bulb wall can be suppressed lower than in the conventional sine wave lighting. The temperature rise at the time of lighting the discharge lamp is related to the power consumption (voltage x current) of the lamp. In pulse wave lighting, the power consumption is small if the brightness is the same as that of sine wave lighting.
Valve temperature can be reduced.
【００１３】水銀封入ランプは、点灯経過とともに昇温
して徐々に水銀蒸気圧が上がり、それに伴って輝度も高
まるが、限られた短時間内の動作に用いる場合には始動
性が悪く不適である。これに対して、キセノンガスを封
入した放電ランプは、紫外線強度が高く発光の立上がり
も速く、始動性がよくなる。Although the mercury-filled lamp rises in temperature as the lighting progresses, the mercury vapor pressure gradually increases, and the brightness increases accordingly. However, when the lamp is used for an operation within a limited short time, the startability is poor and unsuitable. is there. On the other hand, a discharge lamp in which xenon gas is sealed has a high ultraviolet intensity, a fast rise of light emission, and a good startability.
【００１４】本発明の請求項２に記載の照明装置は、装
置本体と、この装置本体に配設された内径５．１ｍｍ以
上の管状ガラスバルブの内面に蛍光体被膜を形成すると
ともにバルブ内部にキセノンガスを含む希ガスを２００
Ｔｏｒｒ以下封入し、バルブ外面にバルブの管軸方向に
沿って外部電極を配設した冷陰極放電ランプと、この冷
陰極放電ランプの外部電極に接続されるとともに上記装
置本体に設けられ周波数１０ＫＨＺ以上８０ＫＨＺ以下
で、かつ、デューテイ比が２％以上５０％以下のパルス
波を発生する点灯回路装置とを具備していることを特徴
とする。According to a second aspect of the present invention, there is provided a lighting device, wherein a phosphor coating is formed on an inner surface of an apparatus main body and a tubular glass bulb having an inner diameter of 5.1 mm or more and provided inside the apparatus main body. 200 rare gases including xenon gas
A cold-cathode discharge lamp in which an external electrode is provided along the tube axis direction of the bulb on the outer surface of the bulb, and a frequency of 10 KHz or more, which is connected to the external electrode of the cold-cathode discharge lamp and is provided in the main body of the apparatus and is provided with And a lighting circuit device that generates a pulse wave having a duty ratio of 2% to 50% at 80 KHZ or less.
【００１５】上記請求項１に記載の作用を奏する点灯手
段を備えており、原稿などの読取りや映像などを終始、
経時しても変化少く保持して照明することができる。A lighting means having the function of claim 1 is provided for reading a document or the like and displaying an image all the time.
Even with the passage of time, illumination can be performed with little change.
【００１６】[0016]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して説明する。図１は直管形の冷陰極放電ランプ
Ｌを示す一部断面正面図、図２は図１ランプＬの矢視Ａ
−Ａ線に沿って切断した部分の横断面と点灯回路装置と
の接続を示す説明図である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional front view showing a straight tube type cold cathode discharge lamp L, and FIG.
It is explanatory drawing which shows the cross section of the part cut | disconnected along the -A line, and the connection with a lighting circuit device.
【００１７】図中１はソーダ石灰ガラスや鉛ガラスなど
からなる外径が約８．０ｍｍ、内径が約７．０ｍｍの直
管状の透明なガラスバルブで、両端は気密に閉塞されて
いる。また、２はこのバルブ１の内面に形成された蛍光
体被膜で、この蛍光体被膜２はバルブの管軸方向に沿っ
て開口部を有するアパーチャ形をなしている。また、バ
ルブ１内には放電媒体としてキセノン（Ｘｅ）が約７０
Ｔｏｒｒ封入されている。In FIG. 1, reference numeral 1 denotes a transparent tubular glass bulb made of soda-lime glass, lead glass, or the like, having an outer diameter of about 8.0 mm and an inner diameter of about 7.0 mm, both ends of which are hermetically closed. Reference numeral 2 denotes a phosphor coating formed on the inner surface of the bulb 1. The phosphor coating 2 has an aperture shape having an opening along the tube axis direction of the bulb. Xenon (Xe) as a discharge medium in the bulb 1 is about 70%.
Torr enclosed.
【００１８】また、４ａ、４ｂはバルブ１の外面に管軸
方向に沿って平行に形成された一対のアルミニウムテー
プからなる帯状の冷陰極をなす外部電極で、上記蛍光体
被膜２の開口部３に対応した光学的および電気的に離隔
して設けられている。また、５は上記アルミニウムテー
プ表面およびバルブ１の全外周面に形成されたシリコン
からなる薄い保護膜で上記外部電極４ａ、４ｂ間の沿面
放電を防いでいる。Reference numerals 4a and 4b denote external electrodes forming a band-shaped cold cathode made of a pair of aluminum tapes formed in parallel on the outer surface of the bulb 1 along the tube axis direction. Are provided optically and electrically separated from each other. Reference numeral 5 denotes a thin protective film made of silicon formed on the surface of the aluminum tape and the entire outer peripheral surface of the bulb 1 to prevent creeping discharge between the external electrodes 4a and 4b.
【００１９】また、６はパルス波を発生するパルス点灯
回路装置で、その出力は放電ランプＬの外部電極４ａ、
４ｂに接続している。Reference numeral 6 denotes a pulse lighting circuit device for generating a pulse wave, the output of which is output from an external electrode 4a of the discharge lamp L,
4b.
【００２０】そして、上記構成の冷陰極放電ランプＬは
外部電極４ａ、４ｂに接続したパルス点灯回路装置６か
らの給電５により点灯される。このパルス点灯回路装置
６から、たとえば１．６ＫＶ、４０ＫＨＺでデューテイ
比が１４％のパルス波電力を外部電極４ａ、４ｂに印加
すると、バルブ１内を隔てた外部電極４ａ、４ｂ間で放
電が生起する。この放電によって希ガスが電離および励
起されて紫外線を発生し、この紫外線が蛍光体被膜２に
より可視光線に変換され、この可視光線が蛍光体被膜２
の形成されていない開口部（アパーチャ）３部分のバル
ブ１を通って外部に放射される。Then, the cold cathode discharge lamp L having the above configuration is lit by the power supply 5 from the pulse lighting circuit device 6 connected to the external electrodes 4a and 4b. When pulse wave power of 1.6 KV, 40 KHZ and a duty ratio of 14% is applied to the external electrodes 4 a and 4 b from the pulse lighting circuit device 6, a discharge occurs between the external electrodes 4 a and 4 b separated from the inside of the bulb 1. I do. The discharge ionizes and excites the rare gas to generate ultraviolet light, which is converted into visible light by the phosphor coating 2, and the visible light is converted to visible light by the phosphor coating 2.
Radiation is radiated to the outside through the valve 1 at the portion of the opening (aperture) 3 where no is formed.
【００２１】この放電ランプＬはパルス波で点灯される
結果、バルブ１壁の温度が６０℃以下となって、従来の
正弦波点灯時に比べて２０℃以上の温度降下があり、ラ
ンプＬの輝度特性の向上が見られた。As a result of the discharge lamp L being lit by a pulse wave, the temperature of the bulb 1 wall becomes 60 ° C. or less, and there is a temperature drop of 20 ° C. or more as compared with the conventional sine wave lighting. The characteristics were improved.
【００２２】すなわち、この種冷陰極放電ランプＬをパ
ルス波点灯Ｐした場合と、正弦波点灯Ｓした場合のバル
ブ１壁の温度を調べると図３のような特性を示す。図３
は、横軸にランプＬの点灯時間（分）を、縦軸にバルブ
１壁の温度（℃）を対比させたもので、図から明らかな
ように点灯経過しても正弦波点灯Ｓ時に比べパルス波点
灯Ｐ時の方がバルブ１壁の温度（℃）を低く抑えられ
る。That is, when the temperature of the bulb 1 wall is examined when the cold-cathode discharge lamp L is pulse-wave-lit P and sine-wave-lit S, the characteristics as shown in FIG. 3 are shown. FIG.
Is a graph in which the horizontal axis represents the lighting time (minutes) of the lamp L, and the vertical axis represents the temperature (° C.) of the bulb 1 wall. During the pulse wave lighting P, the temperature (° C.) of the wall of the bulb 1 can be kept lower.
【００２３】この放電ランプＬ点灯時の温度上昇はラン
プの消費電力（電圧×電流）に関係し、パルス波点灯Ｐ
では正弦波点灯Ｓと同じ輝度ならば消費電力が少いの
で、バルブ温度を低減できる。The temperature rise when the discharge lamp L is turned on is related to the power consumption (voltage × current) of the lamp, and the pulse wave lighting P
If the brightness is the same as that of the sine wave lighting S, the power consumption is small, so that the bulb temperature can be reduced.
【００２４】また、放電ランプＬの温度と輝度との関係
を調べると図４のような特性を示す。図４は、横軸にバ
ルブ１壁の温度（℃）を、縦軸に輝度（ｃｄ／ｍ2 ）を
対比させたもので、図から明らかなようにバルブ１壁の
温度が８０℃から６０℃に下がると、輝度が約５％向上
する。When the relationship between the temperature and the brightness of the discharge lamp L is examined, the characteristics shown in FIG. 4 are obtained. FIG. 4 shows the temperature (° C.) of the wall of the bulb 1 on the horizontal axis and the luminance (cd / m 2 ) on the vertical axis. As is clear from FIG. As the temperature drops to 5 ° C., the brightness increases by about 5%.
【００２５】また、上記からパルス波点灯Ｐした場合、
と正弦波点灯Ｓした場合の、点灯経過後の輝度特性は図
５に示すようになる。図５は、横軸にランプＬの点灯時
間（分）を、縦軸に輝度の低下率（％）を対比させたも
ので、図から明らかなように点灯経過しても正弦波点灯
Ｓ時に比べパルス波点灯Ｐ時の方が輝度の低下は１／２
程度と少く、良好な発光特性が維持できる。Further, from the above, when the pulse wave lighting P is performed,
When the sine wave lighting S is performed, the luminance characteristics after the lapse of lighting are as shown in FIG. FIG. 5 is a graph in which the horizontal axis represents the lighting time (minutes) of the lamp L and the vertical axis represents the luminance reduction rate (%). As is apparent from FIG. Compared with that, when the pulse wave lighting P is performed, the brightness is reduced by half.
Good emission characteristics can be maintained with a small degree.
【００２６】また、上記実施の形態に示す放電ランプＬ
は、ランプＬ点灯時に外部電極４ａ、４ｂ間の蛍光体被
膜２非形成部の開口部（アパーチャ）３は透明であるた
め損失を少なく光を通す。また、バルブ１の外面に形成
したアルミニウムテープからなる外部電極４ａ、４ｂが
反射性を有するので、光放射用の開口部（アパーチャ）
３からの光出力が多くなり、その光放射量を増加させる
ことができる。The discharge lamp L shown in the above embodiment
When the lamp L is turned on, the opening (aperture) 3 in the portion where the phosphor coating 2 is not formed between the external electrodes 4a and 4b is transparent, so that light is transmitted with little loss. In addition, since the external electrodes 4a and 4b made of aluminum tape formed on the outer surface of the bulb 1 have reflectivity, an opening (aperture) for light emission is provided.
3, the light output from the light emitting device 3 is increased, and the light emission amount can be increased.
【００２７】なお、本発明者の実験によれば、管状ガラ
スバルブの内径が５．１ｍｍ以上（断面積約２１ｍｍ2
以上）で、バルブ内部にキセノンガスを含む希ガスを２
００Ｔｏｒｒ以下封入した外部電極形の放電ランプにお
いて、パルス発生回路装置から印加するパルス波の周波
数が１０ＫＨＺ以上８０ＫＨＺ以下で、かつ、デューテ
イ比が２％以上５０％以下の範囲内であれば良好な結果
が得られた。上記パルス波の周波数が１０ＫＨＺ未満の
場合および８０ＫＨＺを超えた場合は、発光効率が低下
して輝度低下も大きくなり実用上問題がある。好ましく
は３０ないし６０ＫＨＺ程度がよい。また、デューテイ
比も２％未満の場合は、発光時間が短くなり効率が悪く
なり、また、５０％を超えた場合は、発光に関係のない
電力が無駄に消費されるだけで効率が悪くなり、パルス
点灯する意味がなくなる不具合がある。According to the experiment of the present inventors, the inner diameter of the tubular glass bulb was 5.1 mm or more (the cross-sectional area was about 21 mm 2.
Above), the rare gas containing xenon gas is
Good results are obtained when the frequency of the pulse wave applied from the pulse generating circuit device is in the range of 10 KHZ to 80 KHZ and the duty ratio is in the range of 2% to 50% in a discharge lamp of an external electrode type enclosed in 00 Torr or less. was gotten. When the frequency of the pulse wave is less than 10 KHZ or more than 80 KHZ, the luminous efficiency is reduced and the luminance is greatly reduced, which poses a practical problem. Preferably, it is about 30 to 60 KHZ. When the duty ratio is less than 2%, the light emission time is shortened and the efficiency is deteriorated. When the duty ratio is more than 50%, power unrelated to the light emission is only wasted and the efficiency is deteriorated. However, there is a problem that the meaning of pulse lighting is lost.
【００２８】また、希ガス中のキセノンの封入圧力が高
いほど高輝度となるが、高過ぎると点灯時にちらつきが
生じて好ましくない。また、逆に低すぎると暗くて短寿
命となる。Further, the higher the sealing pressure of xenon in the rare gas is, the higher the brightness is, but if it is too high, flickering occurs at the time of lighting, which is not preferable. Conversely, if it is too low, it will be dark and have a short life.
【００２９】また、図６は本発明に係わる照明装置Ｄの
実施の形態を示す。図６において７は冷陰極放電ランプ
Ｌを収納した筐体からなる装置本体で、この本体７内
（外でもよい）にパルス点灯回路装置６が設けられてい
る。また、本体７内には必要に応じ反射鏡が設けられて
いる。FIG. 6 shows an embodiment of a lighting device D according to the present invention. In FIG. 6, reference numeral 7 denotes an apparatus main body composed of a housing accommodating the cold cathode discharge lamp L, and a pulse lighting circuit device 6 is provided inside (or outside) the main body 7. In addition, a reflecting mirror is provided in the main body 7 as needed.
【００３０】この照明装置Ｄは複写機、ファクシミリの
読取用や液晶表示装置のバックライトやに用いられ、上
述したようにランプＬの発光特性の向上がはかれること
から、照射面照度を高めることができ画像や転写の鮮明
度を上げることができる。The illuminating device D is used for a copying machine, a facsimile, a backlight of a liquid crystal display device, and the like. As described above, the luminous characteristics of the lamp L are improved. The sharpness of the image and the transfer can be improved.
【００３１】なお、本発明は上記実施の形態に限定され
ない。たとえば、低圧放電ランプは、バルブの内面に蛍
光体被膜が形成してない希ガス発光の放電ランプであっ
てもよく、また、バルブの形状は直管状に限らずＵ字
形、Ｗ字形や環形などに曲成したものであってもよい。
また、蛍光体被膜は開口部を設けずにバルブ内面の全面
に形成してあってもよく、また、バルブの表面に反射被
膜が形成してあっても差支えない。The present invention is not limited to the above embodiment. For example, a low-pressure discharge lamp may be a rare gas emission discharge lamp in which a phosphor film is not formed on the inner surface of the bulb, and the shape of the bulb is not limited to a straight tube, but may be a U-shape, a W-shape, a ring shape, or the like. It may be composed of
Further, the phosphor coating may be formed on the entire inner surface of the bulb without providing the opening, or a reflective coating may be formed on the surface of the bulb.
【００３２】また、外部電極は一対形成したものに限ら
ず、１つでも複数であってもよく、内部電極を併設した
ものであってもよい。また、外部電極としては、アルミ
ニウムテープに限らず、アルミニウム（Ａｌ）、ニッケ
ル（Ｎｉ）、金（Ａｕ）、白金（Ｐｔ）、銀・白金（Ａ
ｇ・Ｐｔ）合金などの良導電性金属材料を蒸着や印刷に
より形成あるいはテープや箔にして貼付してもよい。ま
た、ネサ膜（ＳｎＯ2）など不透明な材質の電極であっ
てもよいが、光反射性を有する場合は、実施の形態のよ
うに反射体として活用してもよい。The number of external electrodes is not limited to one formed as a pair, and one or more external electrodes may be provided, and an internal electrode may be provided in parallel. The external electrodes are not limited to the aluminum tape, but may be aluminum (Al), nickel (Ni), gold (Au), platinum (Pt), silver / platinum (A
g · Pt) alloy or other good conductive metal material may be formed by vapor deposition or printing, or may be attached as a tape or foil. In addition, an electrode made of an opaque material such as a Nesa film (SnO 2 ) may be used, but if it has light reflectivity, it may be used as a reflector as in the embodiment.
【００３３】また、放電媒体としての希ガスはキセノン
（Ｘｅ）の他、ネオン（Ｎｅ）、クリプトン（Ｋｒ）や
アルゴン（Ａｒ）などの希ガスを一種ないし複数種封入
してもよい。The rare gas serving as the discharge medium may include one or more rare gases such as neon (Ne), krypton (Kr), and argon (Ar), in addition to xenon (Xe).
【００３４】さらに、外部電極間の短絡防止などのため
バルブの全外周（外部電極を含む）に亘り形成した保護
被膜は、シリコンの塗布や熱収縮性ポリエチレンチュー
ブなどを被せ形成してもよく、その範囲も外部電極上の
みであってもよい。Further, the protective film formed over the entire outer periphery (including the external electrode) of the bulb for preventing short circuit between the external electrodes may be formed by coating with silicon or heat-shrinkable polyethylene tube. The range may be only on the external electrode.
【００３５】さらにまた、照明装置は実施の形態の構成
に限らない。Further, the lighting device is not limited to the configuration of the embodiment.
【００３６】[0036]
【発明の効果】本発明の請求項１に記載の構成によれ
ば、放電ランプの始動性を向上するとともに輝度などの
発光特性の経時低下を低減した放電ランプの点灯手段を
提供することができる。According to the structure of the first aspect of the present invention, it is possible to provide a lighting means for a discharge lamp in which the startability of the discharge lamp is improved and the emission characteristics such as luminance are not reduced over time. .
【００３７】本発明の請求項２に記載の構成によれば、
上記請求項１に記載の効果を奏する点灯手段を備えてお
り、原稿などの読取りや映像などを終始、経時しても照
明の変化少く保持して均一品質が得られる照明装置を提
供することができる。According to the second aspect of the present invention,
It is possible to provide an illuminating device which is provided with a lighting means having the effect of the above-mentioned claim 1 and which can read a document or a video or the like from start to finish, keep a small change in illumination even with time, and obtain uniform quality. it can.
【図１】本発明に係る直管形の冷陰極放電ランプの実施
の形態を示す一部断面正面図である。FIG. 1 is a partially sectional front view showing an embodiment of a straight tube type cold cathode discharge lamp according to the present invention.
【図２】図１のランプの矢視Ａ−Ａ線に沿って切断した
部分の横断面と点灯回路装置との接続を示す説明図であ
る。FIG. 2 is an explanatory diagram showing a cross section of a portion of the lamp shown in FIG. 1 cut along line AA and a connection with a lighting circuit device.
【図３】冷陰極放電ランプをパルス波点灯した場合と正
弦波点灯した場合の、点灯時間（分）（横軸）と、バル
ブ壁の温度（℃）（縦軸）とを対比させたグラフであ
る。FIG. 3 is a graph comparing the lighting time (minutes) (horizontal axis) and the temperature of the bulb wall (° C.) (vertical axis) when the cold cathode discharge lamp is pulse-wave lit and sine-wave lit. It is.
【図４】冷陰極放電ランプをパルス波点灯した場合と正
弦波点灯した場合の、バルブ壁の温度（℃）（横軸）
と、輝度（ｃｄ／ｍ2 ）（縦軸）とを対比させたグラフ
である。FIG. 4 shows the temperature (° C.) of the bulb wall when the cold cathode discharge lamp is lit by a pulse wave and by a sine wave (horizontal axis).
5 is a graph comparing brightness (cd / m 2 ) (vertical axis).
【図５】冷陰極放電ランプをパルス波点灯した場合と正
弦波点灯した場合の、ランプの点灯時間（分）（横軸）
と、輝度の低下率（％）（縦軸）とを対比させたグラフ
である。FIG. 5 shows the lighting time (minutes) of the cold cathode discharge lamp in the case of pulse wave lighting and in the case of sine wave lighting (horizontal axis)
5 is a graph in which the brightness reduction rate (%) (vertical axis) is compared with the brightness.
【図６】本発明に係る照明装置の実施の形態を示す斜視
図である。FIG. 6 is a perspective view showing an embodiment of a lighting device according to the present invention.
Ｌ：冷陰極放電ランプ Ｄ：照明装置 １：ガラスバルブ ２：蛍光体被膜 ４ａ、４ｂ：外部電極 ６：パルス点灯回路装置 ７：装置本体 L: cold cathode discharge lamp D: lighting device 1: glass bulb 2: phosphor coating 4a, 4b: external electrode 6: pulse lighting circuit device 7: device body
Claims (2)
の内面に蛍光体被膜を形成するとともにバルブ内部にキ
セノンガスを含む希ガスを２００Ｔｏｒｒ以下封入し、
バルブ外面にバルブの管軸方向に沿って外部電極を配設
した冷陰極放電ランプを、周波数１０ＫＨＺ以上８０Ｋ
ＨＺ以下で、かつ、デューテイ比が２％以上５０％以下
のパルス波を印加して点灯することを特徴とする放電ラ
ンプの点灯方法。1. A phosphor film is formed on an inner surface of a tubular glass bulb having an inner diameter of 5.1 mm or more, and a rare gas containing xenon gas is sealed in the bulb at 200 Torr or less,
A cold cathode discharge lamp having an external electrode disposed on the outer surface of the bulb along the tube axis direction of the bulb is operated at a frequency of 10 KHz to 80 KHz.
A lighting method of a discharge lamp, characterized in that a lighting operation is performed by applying a pulse wave having a duty ratio of 2% or more and 50% or less at HZ or less.
内径５．１ｍｍ以上の管状ガラスバルブの内面に蛍光体
被膜を形成するとともにバルブ内部にキセノンガスを含
む希ガスを２００Ｔｏｒｒ以下封入し、バルブ外面にバ
ルブの管軸方向に沿って外部電極を配設した冷陰極放電
ランプと、この冷陰極放電ランプの外部電極に接続され
るとともに上記装置本体に設けられ周波数１０ＫＨＺ以
上８０ＫＨＺ以下で、かつ、デューテイ比が２％以上５
０％以下のパルス波を発生する点灯回路装置とを具備し
ていることを特徴とする照明装置。2. A phosphor film is formed on an inner surface of an apparatus main body and a tubular glass bulb having an inner diameter of 5.1 mm or more provided in the apparatus main body, and a rare gas containing xenon gas is sealed in the bulb at 200 Torr or less. A cold cathode discharge lamp in which external electrodes are arranged along the tube axis direction of the bulb on the outer surface of the bulb, and a frequency of 10 KHz to 80 KHz, which is connected to the external electrodes of the cold cathode discharge lamp and is provided in the apparatus main body, And the duty ratio is 2% or more 5
A lighting circuit device for generating a pulse wave of 0% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9052761A JPH10255994A (en) | 1997-03-07 | 1997-03-07 | Discharge lamp lighting method and illuminating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9052761A JPH10255994A (en) | 1997-03-07 | 1997-03-07 | Discharge lamp lighting method and illuminating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10255994A true JPH10255994A (en) | 1998-09-25 |
Family
ID=12923871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9052761A Withdrawn JPH10255994A (en) | 1997-03-07 | 1997-03-07 | Discharge lamp lighting method and illuminating system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10255994A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7218308B2 (en) | 2000-05-18 | 2007-05-15 | Hitachi, Ltd. | Liquid crystal display device having an improved backlight |
-
1997
- 1997-03-07 JP JP9052761A patent/JPH10255994A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7218308B2 (en) | 2000-05-18 | 2007-05-15 | Hitachi, Ltd. | Liquid crystal display device having an improved backlight |
| US7518594B2 (en) | 2000-05-18 | 2009-04-14 | Hitachi, Ltd. | Liquid crystal display device having an improved backlight |
| US7990361B2 (en) | 2000-05-18 | 2011-08-02 | Hitachi, Ltd. | Liquid crystal display device having an improved backlight |
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Free format text: JAPANESE INTERMEDIATE CODE: A761 Effective date: 20040728 |