WO2004012224A1 - 電球形無電極蛍光ランプおよびその製造方法 - Google Patents
電球形無電極蛍光ランプおよびその製造方法 Download PDFInfo
- Publication number
- WO2004012224A1 WO2004012224A1 PCT/JP2003/009519 JP0309519W WO2004012224A1 WO 2004012224 A1 WO2004012224 A1 WO 2004012224A1 JP 0309519 W JP0309519 W JP 0309519W WO 2004012224 A1 WO2004012224 A1 WO 2004012224A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- neck
- fluorescent lamp
- tube
- bulb
- electrodeless fluorescent
- 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.)
- Ceased
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
- H01J9/245—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps
- H01J9/247—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps specially adapted for gas-discharge lamps
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
- H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
- H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
- H01J65/048—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using an excitation coil
Definitions
- the present invention relates to a bulb-type electrodeless fluorescent lamp and a method for producing the same.
- bulb-type fluorescent lamps with electrodes which are approximately five times more efficient than incandescent lamps, have been widely used as substitutes for light bulbs in houses and hotels.
- Such a bulb-shaped fluorescent lamp having electrodes is disclosed, for example, in Japanese Patent Application Laid-Open No. 2001-196194.
- the bulb-type fluorescent lamp has a built-in lighting circuit and a base, so it has a structure that can be directly substituted for an incandescent lamp.
- electrodeless bulb-type fluorescent lamps have begun to spread in addition to the existing electrode-type bulb-type fluorescent lamps.
- the feature of electrodeless fluorescent lamps is that they have a longer service life than electrodeed fluorescent lamps because they have no electrodes, and are expected to become more widespread in the future.
- Such a bulb-type electrodeless fluorescent lamp is disclosed, for example, in US Pat. No. 5,959,405.
- Figure 7 shows the bulb-type electrodeless fluorescent lamp.
- the bulb-shaped electrodeless fluorescent lamp 100 shown in FIG. 7 is a bulb-shaped electrodeless fluorescent lamp that is an alternative to a reflective bulb (reflamp).
- This lamp 1000 is composed of an arc tube (valve) 110, a case 150 with a reflecting surface 152, and a base 160.
- An induction coil 130 is inserted into the recess of the arc tube 110.
- most of the external appearance (especially the side) of the arc tube 110 can be covered by the reflective surface 152 attached to the case 150. It is not necessary to pay special attention to the external shape of the arc tube.
- a gap is often formed between the arc tube and the case, which causes an aesthetic problem.
- the arc tube portion that must be housed in the case becomes too large, and the space for arranging the lighting circuit in the case Is lost. If a lighting circuit is to be arranged, the case must be made even larger.
- the shape of the bulb-shaped electrodeless fluorescent lamp differs from the shape of an incandescent lamp, which also causes an aesthetic problem.
- the present invention has been made in view of the above points, and a main object thereof is to provide a bulb-type electrodeless fluorescent lamp having the same appearance as an incandescent bulb. Disclosure of the invention
- a bulb-type electrodeless fluorescent lamp includes a light emitting tube filled with a luminescent gas and having a recess, an induction coil inserted into the recess, and a lighting circuit electrically connected to the induction coil.
- a case accommodating the lighting circuit; a base electrically connected to the lighting circuit; and a base attached to the case, wherein the arc tube has a substantially spherical outer tube and an inner portion defining the recess.
- a neck portion located around a sealing portion formed by joining the outer tube and the inner tube, of the outer tube, in order from the sealing portion, A concave portion and a neck convex portion are formed.
- the appearance of the arc tube is substantially a glass sphere type A shape o
- neck protrusion and the upper end of the case are close to or in contact with each other. Good.
- the residual stress of the neck projection is 14 MPa or less.
- the residual stress in the neck recess is not more than 14 MPa.
- a residual stress of the neck portion including the neck convex portion and the neck concave portion is 7 MPa or less.
- the residual stress of the entire outer tube in the arc tube is 7 MPa or less.
- the method for producing a bulb-type electrodeless fluorescent lamp of the present invention comprises the steps of: (a) preparing an outer tube having a substantially spherical portion at one end and an opening at the other end; and a cylindrical inner tube. (B) setting the inner pipe in the outer pipe, sealing a part of the outer pipe and a part of the inner pipe, and joining the outer pipe and the inner pipe; In the step (b), a step of forming a network concave portion and a neck convex portion in a neck portion located around a sealing portion where the outer tube and the inner tube are joined is performed. After the step (b), a step of reducing the residual stress of the neck projection to 14 MPa or less by heating the neck projection at least.
- the step of reducing the residual stress to 14 MPa or less includes a step of annealing the glass material forming the outer tube at a temperature of an annealing point.
- FIG. 1 is a cross-sectional view schematically showing a configuration of an arc tube 100 of a bulb-type electrodeless fluorescent lamp according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram showing the appearance of the arc tube 100.
- FIG. 2 is a diagram showing the appearance of the arc tube 100.
- FIG. 3 is a cross-sectional view schematically showing the configuration of the bulb-type electrodeless fluorescent lamp 220 according to the first embodiment.
- FIG. 4 is a diagram of the arc tube 100 for explaining the distortion of the neck convex portion 16 and the neck concave portion 14.
- FIGS. 5 (a) and 5 (b) are tracings of photographs of strain measurement of the arc tube 100 before and after annealing, respectively.
- FIGS. 6A to 6C are views for explaining a manufacturing method according to the second embodiment of the present invention.
- FIG. 6A to 6C are views for explaining a manufacturing method according to the second embodiment of the present invention.
- FIG. 7 is a cross-sectional view showing a configuration of a conventional bulb-type electrodeless fluorescent lamp.
- FIG. 8 is a chart showing the results of the heat cycle test.
- Fig. 9 is a chart showing the difference in strain between cracked and uncracked ones in the heat cycle test.
- FIG. 10 is a chart showing the correlation between the strain and the stress in soda glass.
- Fig. 11 is a chart showing the fatigue parameters of soda glass.
- FIG. 12 is a chart showing a change in rupture time due to a decrease in stress.
- a bulb-type electrodeless fluorescent lamp according to a first embodiment of the present invention will be described with reference to FIGS.
- FIG. 1 schematically shows a cross-sectional configuration of an arc tube 100 of the bulb-type electrodeless fluorescent lamp of the present embodiment
- FIG. 2 shows an appearance of the arc tube 100.
- the arc tube 100 is composed of a substantially spherical outer tube 100 and an inner tube 20 defining a concave portion (cavity) 24.
- the outer tube 10 and the inner tube 20 are joined by sealing at the sealing portion 12, and the neck portion 13 is located around the sealing portion 12 c.
- An induction coil is inserted into 4, and a thin exhaust pipe 22 used in the manufacturing process is attached to the upper part of the inner pipe 20.
- one end of the thin tube 22 is connected to the inside of the arc tube, but the other end is sealed, so that the inside of the arc tube has a sealed structure.
- a phosphor layer is formed on at least a part of the inner wall of the arc tube 100.
- the neck portion 13 is formed with a neck concave portion 14 and a neck convex portion 16 in this order from the sealing portion 12.
- a smooth substantially elliptical shape is formed in the case of the arc tube 100 in which the neck concave portion 14 and the neck convex portion 16 are formed.
- the lower part of the arc tube 100 (particularly, the part below the neck convex part 16) can be shortened, so that the shape is substantially the same as the glass ball type A shape.
- the glass sphere type A is the shape of a glass sphere specified in JISC770, which is a so-called eggplant shape.
- the neck portion is a portion that narrows from the maximum diameter portion of the arc tube toward the base.
- FIG. 3 schematically shows a cross-sectional configuration of a bulb-shaped electrodeless fluorescent lamp 220 provided with an arc tube 100.
- the cross section of the recessed portion is shown in two stages on the left and right for easy understanding of the structure.
- the bulb-type electrodeless fluorescent lamp shown in FIG. 3 has an arc tube 100, an induction coil 30, a lighting circuit 40, a case 50, and a base 60.
- the arc tube 100 is filled with a light-emitting gas, for example, mercury and a rare gas.
- An induction coil is inserted into the recess 24 formed in the arc tube 100.
- the induction coil 30 includes a ferrite core 32 and a winding 34.
- the induction coil 30 is electrically connected to the lighting circuit 40, and the lighting circuit 40 is housed in the case 50.
- a base 60 is attached to a lower portion of the case 50, and the base 60 is electrically connected to the lighting circuit 40.
- the neck concave portion 14 and the neck convex portion 16 are formed in the arc tube 100, so that the neck convex portion 16 and the upper end 50a of the case 50 are close to each other. Or can be contacted. Therefore, the connection point 80 between the arc tube 100 and the case 50 is aesthetically smooth, and there are no large gaps or large steps that impair the aesthetic appearance. In addition, since the connection portion 80 is smooth and the position of the sealing portion 12 of the arc tube 100 is above the case 50, a space for disposing the lighting circuit 40 in the case 50 is provided. It is possible to secure enough. Therefore, it is possible to avoid the problem that the case 50 must be made large so as to impair the aesthetic appearance.
- the shape of the arc tube 100 is substantially a glass sphere type A, and the diameter of the glass sphere (the maximum diameter of the arc tube 100) is, for example, 55 to 75 mm. It is.
- the length (total length) from the top of the arc tube 100 to the end of the base 60 is, for example, 120 to 65 mm.
- the base 60 uses E26 / 25.
- the rated voltage [V] and the rated power consumption [W] are 100 to 240 V and 7 to 22 W, respectively.
- the arc tube 100 shown in FIGS. 1 to 3 it is possible to provide a bulb-type electrodeless fluorescent lamp having the same appearance as an incandescent lamp without impairing the appearance. It was found that as a result of forming the neck concave portion 14 and the neck convex portion 16, the strength and reliability of the neck portion 13 were reduced. The inventor of the present application has considered the problem and started to solve it.
- the area with the oblique line from the upper right to the lower left is shown as the area where the compressive strain is present, and the area with the oblique line from the upper left to the lower right is where the tensile strain is present. This is shown as a region to be used.
- the compressive residual stress at the neck convex portion 16 must be 14 MPa or less (preferably 7 MPa or less, more preferably substantially OMPa (1.4 MPa or less). )) Is desirable. Further, it is desirable that the residual tensile stress in the neck recess 14 is 14 MPa or less (preferably 7 MPa or less, more preferably substantially OMPa (1.4 MPa or less)).
- the residual stress of the entire outer tube 10 in the light emitting tube 100 is 7 MPa or less (preferably, substantially OMPa (1.4 MPa or less)).
- Remove residual stress To remove the arc, a process (annealing) of heating the arc tube to the annealing point of the glass (eg, soda glass) constituting the arc tube 100 is performed.
- the annealing point of soda glass is 520 ° C.
- FIG. 5 (a) is a traced photograph of the arc tube 100 before the anneal treatment when the strain was measured
- FIG. 5 (b) is a diagram where the distortion of the arc tube 100 after the anneal treatment was measured. It is the figure which traced the photograph.
- a distortion tester manufactured by Toshiba
- SVP-10-II sensitive color method
- a strain tester manufactured by Luceo
- L SM was used for measuring the skewness. —701 (reflective Senarmont method) was used.
- the residual stress of the neck convex portion 16 was 34 MPa (strain degree 25 °).
- the residual stress of the neck convex portion 16 was 1.4 MPa (a skewness of 1 ° or less).
- the residual stress in the entire arc tube was 1.4 MPa (strain less than 1 °).
- the samples prepared for the experiment are the following four types of arc tubes 100.
- Figure 8 shows the results of the heat cycle (hot / cold water) test.
- Y Dimensionless coefficient determined by the shape of cracks and test pieces, load type, etc.
- A, n Overnight fatigue parameters
- the fatigue parameter, n is called the crack growth susceptibility coefficient and is a measure of the difficulty of crack growth, and varies depending on the material and environment.
- Figure 11 shows the fatigue parameters of soda glass (Source: Glass Engineering Handbook (Asakura Shoten)).
- Fig. 12 shows the change in rupture time due to a decrease in stress when the glass thickness is 1 mm.
- n 13-16
- the life is 8000-650,000 times at 1/2 stress and 60-40 million times at 1Z4 stress. If the stress is set to about 14Mpa or less, it will be able to withstand a thermal cycle more than 8000 times the heat shock test. This means that it can withstand more than 40,000 heat cycles. If the residual stress can be further reduced to half, it can withstand a heat cycle of 300 million times or more, which means that the probability of crack generation is almost zero. Means something new. As described above, the arc tube of the present embodiment is also theoretically considered.
- the neck portion 13 is formed with the neck concave portion 14 and the neck convex portion 16
- the light bulb-shaped non-fluorescent lamp having the same appearance as the incandescent lamp is provided.
- An electrode fluorescent lamp can be realized.
- the residual stress of the net convex portion 16 is 14 MPa or less (preferably 7 MPa or less)
- cracking of the arc tube 100 of the bulb-type electrodeless fluorescent lamp 220 can be suppressed. I can go.
- FIGS. 6 (a) to 6 (c) are process diagrams for explaining the manufacturing method of the present embodiment.
- an outer tube 10 made of soda glass and a cylindrical inner tube 20 are prepared.
- the outer tube 10 prepared here has a substantially spherical portion at one end and an opening at the other end, and the size (typically, diameter) of the opening is the inner tube 2. It is made larger than the diameter of the cylinder of 0.
- a thin tube 22 for exhaust is attached to the inner tube 20.
- the heating part (sealing part) melts, and the lower side (cullet part) 10a of the outer tube 10 extends by its own weight.
- the cullet portion 10a melts down, and the outer tube 10 and the inner tube 20 are joined to form a sealing portion, thereby forming the sealed arc tube. 1 0 0 'is obtained.
- the neck recess 13 and the neck projection 16 can be formed in the neck 13 by adjusting the wrench 70 between FIGS. 6 (a) to 6 (c). Thereafter, at least the neck portion 13 is gradually cooled by the burner 70.
- the arc tube 100 is placed in a furnace and subjected to an annealing process.
- Annealing treatment The temperature of the furnace for the heating may be around the annealing point (eg, about 520 ° C).
- the inside of the tube is evacuated and filled with a sealed gas, and the sealing of the thin tube 22 is also completed, so that a completed arc tube 100 is obtained.
- a bulb-type electrodeless fluorescent lamp 220 is obtained.
- the lighting circuit 40 preferably generates a relatively low frequency of 1 MHz or less (for example, 40 to 500 kHz).
- the frequency of the high-frequency voltage applied to the light emitting tube 100 by the lighting circuit 40 be in a relatively low frequency range of 1 MHz or less (for example, 40 to 500 kHz).
- the configuration of the present embodiment is not limited to operation at 1 MHz or less, and can operate in a frequency region such as 13.56 MHz or several MHz.
- the neck concave portion and the neck convex portion are formed in order from the sealing portion.
- a bulb-type electrodeless fluorescent lamp having an excellent appearance can be provided.
- the residual stress of the neck projection 16 is 14 MPa or less, cracking of the arc tube of the bulb-type electrodeless fluorescent lamp can be suppressed.
- the bulb-type electrodeless fluorescent lamp of the present invention and its manufacturing method are useful when used as a substitute for incandescent lamps, and have high industrial applicability in that they have good appearance and can suppress cracking of the arc tube.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Plasma & Fusion (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2003252707A AU2003252707A1 (en) | 2002-07-30 | 2003-07-28 | Bulb type electrodeless fluorescent lamp and method of manufacturing the fluorescent lamp |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002221944A JP2006054054A (ja) | 2002-07-30 | 2002-07-30 | 電球形無電極蛍光ランプおよびその製造方法 |
| JP2002-221944 | 2002-07-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004012224A1 true WO2004012224A1 (ja) | 2004-02-05 |
Family
ID=31184885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2003/009519 Ceased WO2004012224A1 (ja) | 2002-07-30 | 2003-07-28 | 電球形無電極蛍光ランプおよびその製造方法 |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2006054054A (ja) |
| AU (1) | AU2003252707A1 (ja) |
| WO (1) | WO2004012224A1 (ja) |
Families Citing this family (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008270101A (ja) * | 2007-04-24 | 2008-11-06 | Matsushita Electric Works Ltd | 無電極ランプの管球の製造方法 |
| US8901842B2 (en) | 2013-04-25 | 2014-12-02 | Lucidity Lights, Inc. | RF induction lamp with ferrite isolation system |
| US8872426B2 (en) | 2012-11-26 | 2014-10-28 | Lucidity Lights, Inc. | Arrangements and methods for triac dimming of gas discharge lamps powered by electronic ballasts |
| US9524861B2 (en) | 2012-11-26 | 2016-12-20 | Lucidity Lights, Inc. | Fast start RF induction lamp |
| US9129792B2 (en) | 2012-11-26 | 2015-09-08 | Lucidity Lights, Inc. | Fast start induction RF fluorescent lamp with reduced electromagnetic interference |
| US9460907B2 (en) | 2012-11-26 | 2016-10-04 | Lucidity Lights, Inc. | Induction RF fluorescent lamp with load control for external dimming device |
| US8941304B2 (en) | 2012-11-26 | 2015-01-27 | Lucidity Lights, Inc. | Fast start dimmable induction RF fluorescent light bulb |
| US10128101B2 (en) | 2012-11-26 | 2018-11-13 | Lucidity Lights, Inc. | Dimmable induction RF fluorescent lamp with reduced electromagnetic interference |
| US20140375203A1 (en) | 2012-11-26 | 2014-12-25 | Lucidity Lights, Inc. | Induction rf fluorescent lamp with helix mount |
| US9209008B2 (en) | 2012-11-26 | 2015-12-08 | Lucidity Lights, Inc. | Fast start induction RF fluorescent light bulb |
| US9245734B2 (en) | 2012-11-26 | 2016-01-26 | Lucidity Lights, Inc. | Fast start induction RF fluorescent lamp with burst-mode dimming |
| US9305765B2 (en) | 2012-11-26 | 2016-04-05 | Lucidity Lights, Inc. | High frequency induction lighting |
| US10141179B2 (en) | 2012-11-26 | 2018-11-27 | Lucidity Lights, Inc. | Fast start RF induction lamp with metallic structure |
| US10529551B2 (en) | 2012-11-26 | 2020-01-07 | Lucidity Lights, Inc. | Fast start fluorescent light bulb |
| WO2014082039A1 (en) * | 2012-11-26 | 2014-05-30 | Lucidity Lights, Inc. | Induction rf fluorescent lamp |
| US9161422B2 (en) | 2012-11-26 | 2015-10-13 | Lucidity Lights, Inc. | Electronic ballast having improved power factor and total harmonic distortion |
| US8975829B2 (en) | 2013-04-25 | 2015-03-10 | Lucidity Lights, Inc. | RF induction lamp with isolation system for air-core power coupler |
| US9129791B2 (en) | 2012-11-26 | 2015-09-08 | Lucidity Lights, Inc. | RF coupler stabilization in an induction RF fluorescent light bulb |
| USD746490S1 (en) | 2013-07-19 | 2015-12-29 | Lucidity Lights, Inc. | Inductive lamp |
| USD745982S1 (en) | 2013-07-19 | 2015-12-22 | Lucidity Lights, Inc. | Inductive lamp |
| USD745981S1 (en) | 2013-07-19 | 2015-12-22 | Lucidity Lights, Inc. | Inductive lamp |
| USD747009S1 (en) | 2013-08-02 | 2016-01-05 | Lucidity Lights, Inc. | Inductive lamp |
| USD747507S1 (en) | 2013-08-02 | 2016-01-12 | Lucidity Lights, Inc. | Inductive lamp |
| US10236174B1 (en) | 2017-12-28 | 2019-03-19 | Lucidity Lights, Inc. | Lumen maintenance in fluorescent lamps |
| USD854198S1 (en) | 2017-12-28 | 2019-07-16 | Lucidity Lights, Inc. | Inductive lamp |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4893183A (ja) * | 1972-03-09 | 1973-12-03 | ||
| JPS58184258A (ja) * | 1982-04-21 | 1983-10-27 | 株式会社東芝 | ランプの製造方法 |
| JPS59205150A (ja) * | 1983-05-09 | 1984-11-20 | 松下電子工業株式会社 | 管球の製造方法 |
| JPS629360U (ja) * | 1984-11-09 | 1987-01-20 | ||
| JPH04138657A (ja) * | 1990-09-29 | 1992-05-13 | Toshiba Lighting & Technol Corp | 管球の製造方法 |
| JPH08212981A (ja) * | 1995-02-02 | 1996-08-20 | Hitachi Ltd | 無電極ランプ |
| JPH09320541A (ja) * | 1996-05-24 | 1997-12-12 | Hitachi Ltd | 無電極蛍光ランプ |
| JPH1125925A (ja) * | 1997-07-02 | 1999-01-29 | Hitachi Ltd | 無電極蛍光ランプ |
| US5903109A (en) * | 1996-04-19 | 1999-05-11 | U.S. Philips Corporation | Electrodeless low-pressure discharge lamp with specific electrical conductor clamping means |
| JP2001143889A (ja) * | 1999-11-17 | 2001-05-25 | Matsushita Electric Works Ltd | 無電極放電灯点灯装置 |
-
2002
- 2002-07-30 JP JP2002221944A patent/JP2006054054A/ja active Pending
-
2003
- 2003-07-28 WO PCT/JP2003/009519 patent/WO2004012224A1/ja not_active Ceased
- 2003-07-28 AU AU2003252707A patent/AU2003252707A1/en not_active Abandoned
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4893183A (ja) * | 1972-03-09 | 1973-12-03 | ||
| JPS58184258A (ja) * | 1982-04-21 | 1983-10-27 | 株式会社東芝 | ランプの製造方法 |
| JPS59205150A (ja) * | 1983-05-09 | 1984-11-20 | 松下電子工業株式会社 | 管球の製造方法 |
| JPS629360U (ja) * | 1984-11-09 | 1987-01-20 | ||
| JPH04138657A (ja) * | 1990-09-29 | 1992-05-13 | Toshiba Lighting & Technol Corp | 管球の製造方法 |
| JPH08212981A (ja) * | 1995-02-02 | 1996-08-20 | Hitachi Ltd | 無電極ランプ |
| US5903109A (en) * | 1996-04-19 | 1999-05-11 | U.S. Philips Corporation | Electrodeless low-pressure discharge lamp with specific electrical conductor clamping means |
| JPH09320541A (ja) * | 1996-05-24 | 1997-12-12 | Hitachi Ltd | 無電極蛍光ランプ |
| JPH1125925A (ja) * | 1997-07-02 | 1999-01-29 | Hitachi Ltd | 無電極蛍光ランプ |
| JP2001143889A (ja) * | 1999-11-17 | 2001-05-25 | Matsushita Electric Works Ltd | 無電極放電灯点灯装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006054054A (ja) | 2006-02-23 |
| AU2003252707A1 (en) | 2004-02-16 |
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