JPH0316738B2 - - Google Patents
Info
- Publication number
- JPH0316738B2 JPH0316738B2 JP60279868A JP27986885A JPH0316738B2 JP H0316738 B2 JPH0316738 B2 JP H0316738B2 JP 60279868 A JP60279868 A JP 60279868A JP 27986885 A JP27986885 A JP 27986885A JP H0316738 B2 JPH0316738 B2 JP H0316738B2
- Authority
- JP
- Japan
- Prior art keywords
- arc tube
- frequency
- lighting
- pressure discharge
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 3
- 239000011888 foil Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Description
【発明の詳細な説明】
（技術分野）
本発明は、高圧放電ランプを高周波点灯する高
圧放電灯に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a high-pressure discharge lamp that is operated at high frequency.
（背景技術）
第１図は従来の高圧放電ランプの一例を示し、
石英ガラス等で形成された発光管１の両端には電
極２ａ，２ｂが対向して配設され、該両電極２
ａ，２ｂは封止部３ａ，３ｂに封入されたモリブ
デン箔等の金属箔４ａ，４ｂに接続されている。
金属箔４ａ，４ｂは発光管１の支持も兼ねる支持
導線５ａ，５ｂに接続されており、発光管１は固
定治具６ａ，６ｂを介して支持導線５ａ，５ｂに
固定されている。支持導線５ａ，５ｂは口金７を
介して外部回路に接続される。また、発光管１内
には希ガス及び発光物質が適量封入されており、
発光管１を被う外管８内にはガスが封入され、外
管８の内面には螢光体９が塗布されている。(Background Art) Figure 1 shows an example of a conventional high-pressure discharge lamp.
Electrodes 2a and 2b are disposed facing each other at both ends of the arc tube 1 made of quartz glass or the like.
a, 2b are connected to metal foils 4a, 4b such as molybdenum foil sealed in sealing parts 3a, 3b.
The metal foils 4a, 4b are connected to support conductors 5a, 5b which also serve to support the arc tube 1, and the arc tube 1 is fixed to the support conductors 5a, 5b via fixing jigs 6a, 6b. Support conductors 5a and 5b are connected to an external circuit via a base 7. In addition, an appropriate amount of rare gas and luminescent substance are sealed inside the arc tube 1.
Gas is sealed in an outer tube 8 that covers the arc tube 1, and a phosphor 9 is coated on the inner surface of the outer tube 8.
かかる従来の高圧放電ランプを高周波電源で点
灯すると、発光効率が向上すると共に、点灯回路
の電子化による安定器の小型・軽量化、低損失化
が図れるという利点がある。しかし、一方では発
光管内の音速と発光管形状で決定される特定の周
波数で音響的共鳴現象が発生し、アーク柱の湾
曲、揺らぎ、立ち消え、発光管の破壊等が発生す
るといつた欠点がある。 When such a conventional high-pressure discharge lamp is lit with a high-frequency power source, there are advantages in that the luminous efficiency is improved, and the ballast can be made smaller and lighter, and its loss can be reduced by electronicizing the lighting circuit. However, on the other hand, it has the disadvantage that an acoustic resonance phenomenon occurs at a specific frequency determined by the speed of sound inside the arc tube and the shape of the arc tube, causing arc column curvature, fluctuation, extinction, and destruction of the arc tube. .
安定に点灯するためには、高圧放電ランプが安
定に点灯する周波数域を選択して点灯（例えば特
開昭54−91971号公報参照）すれば良いが、安定
に点灯する周波数域はランプの種類によつて異な
り、また、同一種類のランプに対しても、ランプ
個体間にばらつきが有るため、特定の周波数を設
定するのは困難であつた。 In order to stably light the high-pressure discharge lamp, it is sufficient to select a frequency range in which it lights stably (for example, see Japanese Patent Application Laid-Open No. 54-91971), but the frequency range in which it stably lights depends on the type of lamp. It has been difficult to set a specific frequency because there are variations between individual lamps even for lamps of the same type.
また、10kHz以上の周波数での高周波点灯、直
流点灯（例えば特開昭57−61295号公報参照）、矩
形波点灯（例えば特開昭57−61294号公報参照）
あるいは周波数変調方式で高周波点灯する（例え
ば特開昭56−48095）等により音響的共鳴現象を
回避する方法が提案されているが、かかる点灯方
法においては、回路構成の複雑化や放電電波雑音
の発生等の問題がある。 Also, high-frequency lighting at a frequency of 10 kHz or more, DC lighting (for example, see Japanese Patent Application Laid-Open No. 57-61295), and square wave lighting (for example, see Japanese Patent Application Laid-Open No. 57-61294).
Alternatively, methods have been proposed to avoid the acoustic resonance phenomenon by lighting at high frequencies using a frequency modulation method (for example, Japanese Patent Laid-Open No. 56-48095), but such lighting methods require complicated circuit configurations and problems with discharge radio noise. There are problems such as occurrence.
（発明の目的）
本発明は、上記欠点を除去するために成された
もので、その目的とするところは、高周波点灯時
に、音響的共鳴現象による不安定なアークが発光
管に発生しない高圧放電灯を提供するにある。(Object of the Invention) The present invention has been made to eliminate the above-mentioned drawbacks, and its purpose is to provide a high-pressure discharge lamp that does not generate unstable arcs in the arc tube due to the acoustic resonance phenomenon during high-frequency lighting. It is to provide electric light.
（発明の開示）
本発明は、点灯時に発光管の両端部の温度差が
大きくなる手段を具備して成る高圧放電ランプを
周波数変調方式で高周波点灯することにより、点
灯時に発生する音響的共鳴現象を回避したことを
特徴とする。(Disclosure of the Invention) The present invention provides an acoustic resonance phenomenon that occurs during lighting by lighting a high-pressure discharge lamp, which is equipped with means for increasing the temperature difference between both ends of the arc tube during lighting, using a frequency modulation method. It is characterized by avoiding
まず、音響的共鳴現象について説明する。音響
的共鳴現象は、発光管形状と封入物質で決まる固
有振動数と、入力電力の時間変化による発光管内
の圧力変動とが一致した時に定在波が立つために
生じる共鳴現象である。 First, the acoustic resonance phenomenon will be explained. Acoustic resonance is a resonance phenomenon that occurs when a standing wave is created when the natural frequency determined by the arc tube shape and the enclosed material matches the pressure fluctuation within the arc tube due to time changes in input power.
発光管を円筒形状と仮定し、円筒座標系（ｒ，
θ，ｚ）を考える。なお、ｒは径方向、θは周方
向、ｚは軸方向の座標を表す。かかる場合、上記
各方向に対する共鳴現象の基本周波数Fr，Fθ，
Fzは、次のようになる。 Assuming that the arc tube is cylindrical, the cylindrical coordinate system (r,
θ, z). Note that r represents the radial direction, θ represents the circumferential direction, and z represents the axial coordinate. In such a case, the fundamental frequencies Fr, Fθ,
Fz is as follows.
ｒ方向共鳴：Fr＝3.83C／（2πR） θ方向共鳴：Fθ＝1.84C／（2πR） ｚ方向共鳴：Fz＝Ｃ／（2L） ただし Ｌは発光管長。 r direction resonance: Fr=3.83C/(2πR) θ direction resonance: Fθ=1.84C/(2πR) Z direction resonance: Fz=C/(2L) however L is the arc tube length.
Ｒは発光管の半径。 R is the radius of the arc tube.
Ｃは発光管内の音速であり、管内封入物と管
内温度で決まる。C is the sound velocity inside the arc tube, which is determined by the contents inside the tube and the temperature inside the tube.
Ｃ＝√
γ＝定圧比熱／定積比熱
Ｐ＝気体定数
Ｔ＝発光管内温度
Ｍ＝封入物質の平均原子量
そして、この基本周波数の整数倍の周波数で共
鳴現象が発生する。音響的共鳴現象が発生する
と、共鳴現象によつて生じた力が、アーク柱自体
が有する安定放電を持続させようとする力に打ち
勝つて、アーク柱が変形する。 C=√ γ=specific heat at constant pressure/specific heat at constant volume P=gas constant T=temperature inside the arc tube M=average atomic weight of the enclosed substance Then, a resonance phenomenon occurs at a frequency that is an integral multiple of this fundamental frequency. When an acoustic resonance phenomenon occurs, the force generated by the resonance phenomenon overcomes the force of the arc column itself to maintain stable discharge, causing the arc column to deform.
そこで、本発明者らは種々の発光管形状を持つ
高圧放電ランプを試作し、これらのランプを種々
の高周波点灯方式で点灯することにより、音響的
共鳴現象発生の有無を検討したところ、以下のこ
とが判明した。 Therefore, the present inventors prototyped high-pressure discharge lamps with various arc tube shapes and investigated whether acoustic resonance phenomenon occurred by lighting these lamps with various high-frequency lighting methods, and found the following. It has been found.
一般に、高周波点灯をするときには、可聴周波
数領域を避けて点灯する。また、100KHz以上の
周波数で点灯すると放射電波雑音が発生して問題
となる。そこで、点灯方式として20KHz以下及び
100KHz以上の周波数を含まない領域で周波数変
調方式により点灯したところ、音響的共鳴現象の
回避に有効であることが判明した。第２図はかか
る実験に用いた高圧放電灯点灯装置の一例を示す
回路図で、図中DCは直流電源、FMは周波数変
調信号発生装置、SWはスイツチング素子、Ｚは
限流要素、LAは高圧放電ランプ、COはコンデン
サである。 Generally, when high-frequency lighting is performed, the lighting is performed while avoiding the audible frequency range. Also, if the lamp is turned on at a frequency of 100KHz or higher, radiated radio noise will occur, causing problems. Therefore, the lighting method is below 20KHz and
When the light was turned on using a frequency modulation method in a region that did not include frequencies above 100KHz, it was found to be effective in avoiding acoustic resonance phenomena. Figure 2 is a circuit diagram showing an example of a high-pressure discharge lamp lighting device used in such an experiment. In the figure, DC is a direct current power supply, FM is a frequency modulation signal generator, SW is a switching element, Z is a current limiting element, and LA is a High pressure discharge lamp, CO is a capacitor.
次に、250Wの高圧放電ランプを上記点灯方式
で点灯したところ、発光管の両管端部の温度差が
大きい程、音響的共鳴現象の回避効果が大きくな
ることが判明した。 Next, when a 250W high-pressure discharge lamp was lit using the lighting method described above, it was found that the greater the temperature difference between the ends of the arc tube, the greater the effect of avoiding the acoustic resonance phenomenon.
本発明は上記発見に基づいてなされたもので、
以下、本発明を実施例に基づき更に詳細に説明す
る。 The present invention was made based on the above discovery,
Hereinafter, the present invention will be explained in more detail based on Examples.
前述のように、種々の発光管形状の高圧放電ラ
ンプを、20KHz〜100KHzの周波数領域で周波数
変調方式により高周波点灯したところ、発光管の
両管端部の温度差が大きい程、音響的共鳴現象の
回避効果が大きくなることを見出したわけである
が、ここでは、まずその一例を第３図に示す。こ
の実験に使用した発光管１の形状は、第３図ａ，
ｂに示すように太管径D1と細管径D2の比（D1／
D2）が１対0.6で、太管径部と細管径部の長さの
比（L1／L2）が１対２である。従つて、太管径
部側の電極２ｂ近傍の温度は、細管径部側の電極
２ａ近傍の温度より低くなる。更に、第３図ａに
示すように太管径部を下側にし、細管径部を上側
にして点灯すると、上下管端部の温度差は従来例
の場合よりも大きくなる。逆に、第３図ｂに示す
ように細管径部を下側にし、太管径部を上側にし
て点灯すると、上下管端部の温度差は従来例の場
合よりも小さくなる。そして、音響的共鳴現象の
回避効果を比較すると、第３図ａに示す場合の方
が第３図ｂに示す場合よりも大きくなつているこ
とが判る。なお、同図において横軸は点灯周波数
の中心周波数［ＫHz］であり、縦軸は周波数変調
幅［ＫHz］である。また、ｘ印は音響的共鳴現象
が生じた場合、〇印は音響的共鳴現象が生じなか
つた場合を示す。 As mentioned above, when high-pressure discharge lamps with various arc tube shapes were lit at high frequencies using a frequency modulation method in the frequency range of 20 KHz to 100 KHz, the larger the temperature difference between the ends of the arc tube, the more the acoustic resonance phenomenon occurred. We have found that the avoidance effect becomes greater, and an example of this is shown in FIG. The shape of the arc tube 1 used in this experiment is shown in Figure 3a.
As shown in b, the ratio of the thick tube diameter D1 to the narrow tube diameter D2 (D1/
D2) is 1:0.6, and the ratio (L1/L2) of the lengths of the large diameter section and the narrow diameter section is 1:2. Therefore, the temperature near the electrode 2b on the side of the large diameter section is lower than the temperature near the electrode 2a on the side of the narrow diameter section. Furthermore, when the lamp is turned on with the large diameter part on the lower side and the narrow diameter part on the upper side as shown in FIG. 3a, the temperature difference between the upper and lower ends of the tube becomes larger than in the conventional example. On the other hand, if the light is turned on with the narrow tube diameter section at the bottom and the large tube diameter section at the top as shown in FIG. 3b, the temperature difference between the upper and lower tube ends will be smaller than in the conventional case. Comparing the effects of avoiding the acoustic resonance phenomenon, it can be seen that the case shown in FIG. 3a is greater than the case shown in FIG. 3b. In the figure, the horizontal axis is the center frequency [KHz] of the lighting frequency, and the vertical axis is the frequency modulation width [KHz]. Further, an x mark indicates a case where an acoustic resonance phenomenon occurs, and a circle mark indicates a case where an acoustic resonance phenomenon does not occur.
第４図は本発明に係る異なる実施例を示すもの
で、発光管１の一方の管端部にのみ、例えば酸化
ジルコニウム等よりなる保温膜１１を塗布したこ
とを特徴とし、かかる発光管１を具備した高圧放
電ランプを前記実施例と同様に、保温膜１１塗布
側を上側にして点灯すると、保温膜１１塗布側を
下側にして点灯した場合よりも音響的共鳴現象の
回避効果が大きくなる。 FIG. 4 shows a different embodiment of the present invention, which is characterized in that a heat insulating film 11 made of, for example, zirconium oxide is coated only on one end of the arc tube 1. Similar to the embodiment described above, when the equipped high-pressure discharge lamp is lit with the side coated with the heat insulating film 11 facing upward, the effect of avoiding the acoustic resonance phenomenon is greater than when the lamp is lit with the side coated with the heat retaining film 11 facing downward. .
第５図及び第６図は更に異なる実施例を示すも
ので、第５図ｂに示すように発光管長を、同図ａ
に示す従来のランプの発光管長より長くすると共
に、少なくとも一方の電極長を長くし、両電極２
ａ，２ｂ間の距離は従来と同一にした発光管１を
具備した高圧放電ランプを、電極長の長い側を下
側にして（発光管１が第５図ｂで示す方向になる
ように配置して）、中心周波数30KHz〜90KHz、
周波数変調幅0KHz〜10KHzの領域において周波
数変調点灯した。その実験結果を第６図に示す。
同図より明らかなように、両者を比較すると本実
施例（第６図ｂ参照）の音響的共鳴現象の回避効
果が大きことが判る。なお、第６図ａは従来例を
示し、第６図ｂは本実施例を示す。また、×印は
音響的共鳴現象が生じた場合、〇印は音響的共鳴
現象が生じなかつた場合を示す。 5 and 6 show still different embodiments, in which the arc tube length is changed as shown in FIG.
The length of the arc tube is longer than that of the conventional lamp shown in FIG.
A high-pressure discharge lamp equipped with an arc tube 1 with the same distance between a and 2b as the conventional one is arranged with the longer electrode side facing down (with the arc tube 1 in the direction shown in Figure 5b). ), center frequency 30KHz ~ 90KHz,
Frequency modulation lighting was performed in the frequency modulation width range of 0KHz to 10KHz. The experimental results are shown in FIG.
As is clear from the figure, when the two are compared, it can be seen that the effect of avoiding the acoustic resonance phenomenon in this embodiment (see FIG. 6b) is large. Note that FIG. 6a shows a conventional example, and FIG. 6b shows this embodiment. Further, an x mark indicates a case where an acoustic resonance phenomenon occurs, and an ○ mark indicates a case where an acoustic resonance phenomenon does not occur.
次に、第７図に示すように、発光管１の少なく
とも一方の管端部を略平坦にすると共に、該管端
部に配設される電極２ｂの電極長を長くしたラン
プの場合は、前記第６図ｂに示すよりも音響的共
鳴現象回避効果は大きくなることが確認された。 Next, as shown in FIG. 7, in the case of a lamp in which at least one end of the arc tube 1 is made substantially flat and the length of the electrode 2b disposed at the end of the tube is lengthened, It was confirmed that the acoustic resonance phenomenon avoidance effect was greater than that shown in FIG. 6b.
なお、第８図は前記第６図に示した発光管の形
状を示すもので、ａは第６図ａで用いた発光管、
ｂは第６図ｂで用いた発光管形状を示し、寸法は
それぞれ管内径Ｄ＝15mm、曲面部寸法Lr＝９〜
10mm、電極間距離Lp＝55mm、電極長Lp1＝３mm、
電極長Lp2＝15mmである。 In addition, FIG. 8 shows the shape of the arc tube shown in FIG. 6, where a indicates the arc tube used in FIG. 6 a,
b shows the arc tube shape used in Fig. 6b, and the dimensions are tube inner diameter D = 15 mm, curved surface dimension Lr = 9 ~
10mm, distance between electrodes Lp = 55mm, electrode length Lp 1 = 3mm,
Electrode length Lp 2 =15 mm.
（発明の効果）
本発明は上記のように、点灯時に発光管の両端
部の温度差が大きくなる手段を具備して成る高圧
放電ランプを、周波数変調方式で高周波点灯する
ことにより、音響的共鳴現象を回避することが可
能となり、アーク柱の湾曲、揺らぎ、立ち消え、
発光管の破壊等が防止でき、安定した点灯を維持
することができる高圧放電灯を提供できた。(Effects of the Invention) As described above, the present invention achieves acoustic resonance by lighting a high-pressure discharge lamp, which is equipped with means for increasing the temperature difference between both ends of the arc tube when lit, using a frequency modulation method. It is now possible to avoid the phenomenon of arc pillar curvature, fluctuation, fading,
It was possible to provide a high-pressure discharge lamp that can prevent damage to the arc tube and maintain stable lighting.
第１図は従来の高圧放電ランプを示す正面図、
第２図は本発明に用いる周波数変調点灯装置の一
例を示す回路図、第３図は本発明に係る実験結果
を示す図、第４図は本発明に係る発光管の異なる
実施例を示す管略正面図、第５図は本発明に係る
発光管の更に異なる実施例を従来例と対比して示
す簡略断面図、第６図は上記実施例に係る実験結
果を示す図、第７図は本発明に係る発光管の異な
る実施例を示す管略断面図、第８図は実験に用い
た発光管の形状、寸法を示す正面図である。
Figure 1 is a front view of a conventional high-pressure discharge lamp.
FIG. 2 is a circuit diagram showing an example of a frequency modulation lighting device used in the present invention, FIG. 3 is a diagram showing experimental results according to the present invention, and FIG. 4 is a diagram showing different embodiments of the arc tube according to the present invention. FIG. 5 is a simplified cross-sectional view showing still another embodiment of the arc tube according to the present invention in comparison with a conventional example, FIG. 6 is a diagram showing experimental results regarding the above embodiment, and FIG. 7 is a schematic front view. FIG. 8 is a schematic cross-sectional view of the arc tube showing different embodiments of the arc tube according to the present invention, and FIG. 8 is a front view showing the shape and dimensions of the arc tube used in the experiment.
Claims (1)
る手段を具備して成る高圧放電ランプを、周波数
変調方式で高周波点灯したことを特徴とする高圧
放電灯。 ２ 一方の電極長を他方の電極長よりも長く形成
すると共に、電極長の長い側が下側に位置するよ
うにして点灯したことを特徴とする特許請求の範
囲第１項記載の高圧放電灯。[Scope of Claims] 1. A high-pressure discharge lamp characterized in that the high-pressure discharge lamp is equipped with means for increasing the temperature difference between both ends of the arc tube when lit, and is lit at high frequency using a frequency modulation method. 2. The high-pressure discharge lamp according to claim 1, wherein one electrode length is formed longer than the other electrode length, and the lamp is lit so that the longer electrode length side is located on the lower side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27986885A JPS61142662A (en) | 1985-12-12 | 1985-12-12 | High pressure discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27986885A JPS61142662A (en) | 1985-12-12 | 1985-12-12 | High pressure discharge lamp |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59265052 Division | 1984-12-14 | 1984-12-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61142662A JPS61142662A (en) | 1986-06-30 |
| JPH0316738B2 true JPH0316738B2 (en) | 1991-03-06 |
Family
ID=17617062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27986885A Granted JPS61142662A (en) | 1985-12-12 | 1985-12-12 | High pressure discharge lamp |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61142662A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR9607042A (en) * | 1995-02-13 | 1997-12-30 | Toho Titanium Co Ltd | Solid catalyst component for the polymerization of olefins and catalyst for the polymerization of olefins |
| DE10200026A1 (en) * | 2002-01-02 | 2003-07-17 | Philips Intellectual Property | Cooled high pressure gas discharge lamp |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5648095A (en) * | 1979-09-27 | 1981-05-01 | Toshiba Electric Equip | Device for firing discharge lamp |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54181770U (en) * | 1978-06-14 | 1979-12-22 | ||
| JPS56143766U (en) * | 1980-03-27 | 1981-10-29 |
-
1985
- 1985-12-12 JP JP27986885A patent/JPS61142662A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5648095A (en) * | 1979-09-27 | 1981-05-01 | Toshiba Electric Equip | Device for firing discharge lamp |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61142662A (en) | 1986-06-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |